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Koizumi F, Katoh N, Kanehira T, Kawamoto Y, Nakamura T, Kakisaka T, Uchinami Y, Taguchi H, Fujita Y, Takahashi S, Higaki H, Nishioka K, Yasuda K, Kinoshita R, Suzuki R, Miyamoto N, Yokota I, Kobashi K, Aoyama H. A Risk Prediction Model for Severe Radiation Induced Lymphopenia in Patients with Pancreatic Cancer Treated with Concurrent Chemoradiotherapy. Int J Radiat Oncol Biol Phys 2023; 117:e309. [PMID: 37785118 DOI: 10.1016/j.ijrobp.2023.06.2334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) In pancreatic cancer, radiation induced lymphopenia (RIL) is associated with a poor prognosis. However, normal tissue complication probability (NTCP) models predicting RIL in pancreatic cancer treated with concurrent chemoradiotherapy (CCRT) have yet to be developed. This study aims to develop a least absolute shrinkage and selection operator (LASSO)-based multivariate NTCP model to predict severe RIL in patients with pancreatic cancer during CCRT and to validate the model internally. MATERIALS/METHODS We retrospectively reviewed patients with localized pancreatic cancer who underwent CCRT using three-dimensional conformal radiation therapy from 2013 to 2021. The exclusion criteria were patients with distant metastasis; patients who did not complete RT due to tumor progression; patients who did not have absolute lymphocyte count (ALC) data available before or during RT. An ALC of < 0.5 K/μL during CCRT was defined as severe RIL. A NTCP model of severe RIL was developed by LASSO-based multivariate analysis. We used age, sex, Karnofsky performance status, maximum tumor size, carbohydrate antigen 19-9 level before RT, ALC before RT, volume of planning target volume (PTV), and dosimetric parameters for surrounding organs (including spleen, vertebrae, liver, bilateral kidneys, gastrointestinal tracts) as variables for LASSO. In addition, internal validation was performed by the bootstrap method. The predictive performance of the model was evaluated by the area under the curve (AUC) of the receiver operating characteristic curve and scaled Brier score. RESULTS Of the 131 patients included in the study, the median age was 68 years (range, 42-84), and 55% were male. The median ALC before RT was 1.37 K/µL (0.52-3.50). The median PTV volume was 315.4 ml (86.3-1079.3). The median dose of radiotherapy was 50.4 Gy (16.2-50.4), with 1.8 Gy per fraction. Combination chemotherapy was S-1 in 99 cases (75.6%) and gemcitabine in 32 cases (24.4%). Induction chemotherapy before CCRT was performed in 39 patients (29.8%). Severe RIL was observed in 84 (63.6%) patients. The LASSO showed that low baseline ALC (p = 0.0002), large PTV volume (p < 0.0001), and a large kidney V5 defined as the percentage of bilateral kidneys receiving 5 Gy or more (p = 0.0338) were selected as parameters of the prediction model for severe RIL (AUC = 0.917) and scaled Brier score was 0.511. As a result of internal validation by the bootstrap method, the average AUC was 0.918 (95% confidence interval, 0.849-0.954). CONCLUSION Severe RIL occurred frequently during CCRT for pancreatic cancer, and a NTCP model for severe RIL developed and validated internally in this study showed good predictive performance. External validation is needed before this NTCP model can be used as a benchmark for treatment planning to reduce the risk of severe RIL and for considering future treatment approaches.
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Affiliation(s)
- F Koizumi
- Department of Radiation Oncology, Hokkaido University Faculty of Medicine and Graduate School of Medicine, Sapporo, Japan
| | - N Katoh
- Department of Radiation Oncology, Hokkaido University Faculty of Medicine and Graduate School of Medicine, Sapporo, Japan
| | - T Kanehira
- Department of Medical Physics, Hokkaido University Hospital, Sapporo, Japan
| | - Y Kawamoto
- Division of Cancer Center, Hokkaido University Hospital, Sapporo, Japan
| | - T Nakamura
- Department of Gastroenterological Surgery Ⅱ, Hokkaido University Faculty of Medicine, Sapporo, Japan
| | - T Kakisaka
- Department of Gastroenterological Surgery Ⅰ, Hokkaido University Hospital, Sapporo, Japan
| | - Y Uchinami
- Department of Radiation Oncology, Hokkaido University Faculty of Medicine and Graduate School of Medicine, Sapporo, Japan
| | - H Taguchi
- Department of Radiation Oncology, Hokkaido University Hospital, Sapporo, Japan
| | - Y Fujita
- Department of Radiation Oncology, Hokkaido University Faculty of Medicine and Graduate School of Medicine, Sapporo, Japan
| | - S Takahashi
- Department of Radiation Oncology, Hokkaido University Faculty of Medicine and Graduate School of Medicine, Sapporo, Japan
| | - H Higaki
- Department of Radiation Oncology, Hokkaido University Faculty of Medicine and Graduate School of Medicine, Sapporo, Japan
| | - K Nishioka
- Global Center for Biomedical Science and Engineering, Hokkaido University Faculty of Medicine, Sapporo, Japan
| | - K Yasuda
- Department of Radiation Oncology, Hokkaido University Hospital, Sapporo, Japan
| | - R Kinoshita
- Department of Radiation Oncology, Hokkaido University Hospital, Sapporo, Japan
| | - R Suzuki
- Department of Medical Physics, Hokkaido University Hospital, Sapporo, Japan
| | - N Miyamoto
- Department of Medical Physics, Hokkaido University Hospital, Sapporo, Japan
| | - I Yokota
- Department of Biostatistics, Hokkaido University Faculty of Medicine, Sapporo, Japan
| | - K Kobashi
- Global Center for Biomedical Science and Engineering, Hokkaido University Faculty of Medicine, Sapporo, Japan
| | - H Aoyama
- Department of Radiation Oncology, Hokkaido University Faculty of Medicine and Graduate School of Medicine, Sapporo, Japan
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Hunter E, Amsler C, Breuker H, Chesnevskaya S, Costantini G, Ferragut R, Giammarchi M, Gligorova A, Gosta G, Higaki H, Kanai Y, Killian C, Kletzl V, Kraxberger V, Kuroda N, Lanz A, Leali M, Mäckel V, Maero G, Malbrunot C, Mascagna V, Matsuda Y, Migliorati S, Murtagh D, Nagata Y, Nanda A, Nowak L, Pasino E, Romé M, Simon M, Tajima M, Toso V, Ulmer S, Uggerhøj U, Venturelli L, Weiser A, Widmann E, Wolz T, Yamazaki Y, Zmeskal J. Minimizing plasma temperature for antimatter mixing experiments. EPJ Web Conf 2022. [DOI: 10.1051/epjconf/202226201007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The ASACUSA collaboration produces a beam of antihydrogen atoms by mixing pure positron and antiproton plasmas in a strong magnetic field with a double cusp geometry. The positrons cool via cyclotron radiation inside the cryogenic trap. Low positron temperature is essential for increasing the fraction of antihydrogen atoms which reach the ground state prior to exiting the trap. Many experimental groups observe that such plasmas reach equilibrium at a temperature well above the temperature of the surrounding electrodes. This problem is typically attributed to electronic noise and plasma expansion, which heat the plasma. The present work reports anomalous heating far beyond what can be attributed to those two sources. The heating seems to be a result of the axially open trap geometry, which couples the plasma to the external (300 K) environment via microwave radiation.
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Kolbinger B, Amsler C, Breuker H, Diermaier M, Dupré P, Fleck M, Gligorova A, Higaki H, Kanai Y, Kobayashi T, Leali M, Mäckel V, Malbrunot C, Mascagna V, Massiczek O, Matsuda Y, Murtagh D, Nagata Y, Sauerzopf C, Simon M, Tajima M, Ulmer S, Kuroda N, Venturelli L, Widmann E, Yamazaki Y, Zmeskal J. Recent Developments from ASACUSA on Antihydrogen Detection. EPJ Web of Conferences 2018. [DOI: 10.1051/epjconf/201818101003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The ASACUSA Collaboration at CERNs Antiproton Decelerator aims to measure the ground state hyperfine splitting of antihydrogen with high precision to test the fundamental symmetry of CPT (combination of charge conjugation, parity transformation, and time reversal). For this purpose an antihydrogen detector has been developed. Its task is to count the arriving antihydrogen atoms and therefore distinguish backgroundevents (mainly cosmics) from antiproton annihilations originating from antihydrogen atoms which are produced only in small amounts. A central BGO crystal disk with position sensitive read-out detects the annihilation and a surrounding two-layered hodoscope is used for tracking charged secondaries. The hodoscope has been recently upgraded to allow precise vertex reconstruction. A machine learning analysis based on measured antiproton annihilations and cosmic rays has been developed to identify antihydrogen events.
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Murakami K, Hamai S, Moro-Oka T, Okazaki K, Higaki H, Shimoto T, Ikebe S, Nakashima Y. Variable tibiofemoral articular contact stress in fixed-bearing total knee arthroplasties. Orthop Traumatol Surg Res 2018; 104:177-183. [PMID: 29274859 DOI: 10.1016/j.otsr.2017.11.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Revised: 06/14/2017] [Accepted: 11/17/2017] [Indexed: 02/02/2023]
Abstract
BACKGROUND Rotational allowance at the tibiofemoral joint would be required during deep flexion. However, the amount of flexion and rotation has not been investigated in modern total knee arthroplasty (TKA) designs. The present study aimed to determine the contact stress in five posterior-stabilized fixed-bearing TKA designs. HYPOTHESIS We hypothesized that the contact area and stresses at the tibiofemoral articular surfaces vary according to the type of implant design and tested condition. MATERIALS AND METHODS The contact area and mean and peak contact stresses at the tibiofemoral articular surfaces were determined when a compressive load of 1200N was applied to a NexGen LPS Flex, Scorpio NRG, Genesis II, PFC Sigma, and Foundation implant. Measurements were performed at 0° and 45° flexion with 0°, 5°, 10°, and 15° rotation, and at 90° and 135° flexion with 0, 5°, 10°, 15°, and 20° rotation. RESULTS The LPS Flex showed that the femoral component could not achieve 20° rotation at 135° flexion. The Scorpio NRG showed less than 20MPa of contact stress at all conditions. The Genesis II showed higher contact stress than 20MPa at 135° flexion with 20° rotation. The PFC Sigma showed that the femoral component could not achieve >10° rotation at any flexion angle. The Foundation showed more than 20MPa of contact stress at 90° flexion with 20° rotation and at 135° flexion with 10°, 15°, and 20° rotation. DISCUSSION Surgeons should be more aware of the variable contact conditions of the tibiofemoral articular surfaces in individual TKA designs. LEVEL OF EVIDENCE Level IV, basic science study.
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Affiliation(s)
- K Murakami
- Department of orthopaedic surgery, Graduate school of medical sciences, Kyushu university, 1-3-3, Maidashi, 812-8582 Higashi-ku, Fukuoka, Japan
| | - S Hamai
- Department of orthopaedic surgery, Graduate school of medical sciences, Kyushu university, 1-3-3, Maidashi, 812-8582 Higashi-ku, Fukuoka, Japan.
| | - T Moro-Oka
- Department of orthopaedic surgery, Graduate school of medical sciences, Kyushu university, 1-3-3, Maidashi, 812-8582 Higashi-ku, Fukuoka, Japan; Moro-oka orthopaedic hospital, 101-3, Katawana Nakagawa-machi, 811-1201 Chikushi-gun, Fukuoka, Japan
| | - K Okazaki
- Department of orthopaedic surgery, Graduate school of medical sciences, Kyushu university, 1-3-3, Maidashi, 812-8582 Higashi-ku, Fukuoka, Japan
| | - H Higaki
- Department of biorobotics, faculty of engineering, Kyushu Sangyo university, 2-3-1, Matsugadai, 813-8583 Higashi-ku, Fukuoka, Japan
| | - T Shimoto
- Department of information and systems engineering, faculty of information engineering, Fukuoka institute of technology, 3-30-1, Wajiro-higashi, 811-0295 Higashi-ku, Fukuoka, Japan
| | - S Ikebe
- Department of biorobotics, faculty of engineering, Kyushu Sangyo university, 2-3-1, Matsugadai, 813-8583 Higashi-ku, Fukuoka, Japan
| | - Y Nakashima
- Department of orthopaedic surgery, Graduate school of medical sciences, Kyushu university, 1-3-3, Maidashi, 812-8582 Higashi-ku, Fukuoka, Japan
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Malbrunot C, Amsler C, Arguedas Cuendis S, Breuker H, Dupre P, Fleck M, Higaki H, Kanai Y, Kolbinger B, Kuroda N, Leali M, Mäckel V, Mascagna V, Massiczek O, Matsuda Y, Nagata Y, Simon MC, Spitzer H, Tajima M, Ulmer S, Venturelli L, Widmann E, Wiesinger M, Yamazaki Y, Zmeskal J. The ASACUSA antihydrogen and hydrogen program: results and prospects. Philos Trans A Math Phys Eng Sci 2018; 376:rsta.2017.0273. [PMID: 29459412 PMCID: PMC5829175 DOI: 10.1098/rsta.2017.0273] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Accepted: 12/18/2017] [Indexed: 06/08/2023]
Abstract
The goal of the ASACUSA-CUSP collaboration at the Antiproton Decelerator of CERN is to measure the ground-state hyperfine splitting of antihydrogen using an atomic spectroscopy beamline. A milestone was achieved in 2012 through the detection of 80 antihydrogen atoms 2.7 m away from their production region. This was the first observation of 'cold' antihydrogen in a magnetic field free region. In parallel to the progress on the antihydrogen production, the spectroscopy beamline was tested with a source of hydrogen. This led to a measurement at a relative precision of 2.7×10-9 which constitutes the most precise measurement of the hydrogen hyperfine splitting in a beam. Further measurements with an upgraded hydrogen apparatus are motivated by CPT and Lorentz violation tests in the framework of the Standard Model Extension. Unlike for hydrogen, the antihydrogen experiment is complicated by the difficulty of synthesizing enough cold antiatoms in the ground state. The first antihydrogen quantum states scan at the entrance of the spectroscopy apparatus was realized in 2016 and is presented here. The prospects for a ppm measurement are also discussed.This article is part of the Theo Murphy meeting issue 'Antiproton physics in the ELENA era'.
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Affiliation(s)
- C Malbrunot
- Experimental Physics Department, CERN, Genève 23, 1211, Switzerland
- Stefan-Meyer-Institut für Subatomare Physik, Österreichische Akademie der Wissenschaften, Boltzmanngasse 3, 1090 Wien, Austria
| | - C Amsler
- Stefan-Meyer-Institut für Subatomare Physik, Österreichische Akademie der Wissenschaften, Boltzmanngasse 3, 1090 Wien, Austria
| | - S Arguedas Cuendis
- Stefan-Meyer-Institut für Subatomare Physik, Österreichische Akademie der Wissenschaften, Boltzmanngasse 3, 1090 Wien, Austria
| | - H Breuker
- Ulmer Fundamental Symmetries Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
| | - P Dupre
- Ulmer Fundamental Symmetries Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
| | - M Fleck
- Stefan-Meyer-Institut für Subatomare Physik, Österreichische Akademie der Wissenschaften, Boltzmanngasse 3, 1090 Wien, Austria
| | - H Higaki
- Graduate School of Advanced Sciences of Matter, Hiroshima University, Hiroshima 739-8530, Japan
| | - Y Kanai
- Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
| | - B Kolbinger
- Stefan-Meyer-Institut für Subatomare Physik, Österreichische Akademie der Wissenschaften, Boltzmanngasse 3, 1090 Wien, Austria
| | - N Kuroda
- Institute of Physics, The University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8902, Japan
| | - M Leali
- Dipartimento di Ingegneria dell'Informazione, Università di Brescia, Brescia 25133, Italy
- Istituto Nazionale di Fisica Nucleare, Sez. di Pavia, 27100 Pavia, Italy
| | - V Mäckel
- Stefan-Meyer-Institut für Subatomare Physik, Österreichische Akademie der Wissenschaften, Boltzmanngasse 3, 1090 Wien, Austria
| | - V Mascagna
- Dipartimento di Ingegneria dell'Informazione, Università di Brescia, Brescia 25133, Italy
- Istituto Nazionale di Fisica Nucleare, Sez. di Pavia, 27100 Pavia, Italy
| | - O Massiczek
- Stefan-Meyer-Institut für Subatomare Physik, Österreichische Akademie der Wissenschaften, Boltzmanngasse 3, 1090 Wien, Austria
| | - Y Matsuda
- Institute of Physics, The University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8902, Japan
| | - Y Nagata
- Department of Physics, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan
| | - M C Simon
- Stefan-Meyer-Institut für Subatomare Physik, Österreichische Akademie der Wissenschaften, Boltzmanngasse 3, 1090 Wien, Austria
| | - H Spitzer
- Stefan-Meyer-Institut für Subatomare Physik, Österreichische Akademie der Wissenschaften, Boltzmanngasse 3, 1090 Wien, Austria
| | - M Tajima
- Institute of Physics, The University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8902, Japan
| | - S Ulmer
- Ulmer Fundamental Symmetries Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
| | - L Venturelli
- Dipartimento di Ingegneria dell'Informazione, Università di Brescia, Brescia 25133, Italy
- Istituto Nazionale di Fisica Nucleare, Sez. di Pavia, 27100 Pavia, Italy
| | - E Widmann
- Stefan-Meyer-Institut für Subatomare Physik, Österreichische Akademie der Wissenschaften, Boltzmanngasse 3, 1090 Wien, Austria
| | - M Wiesinger
- Stefan-Meyer-Institut für Subatomare Physik, Österreichische Akademie der Wissenschaften, Boltzmanngasse 3, 1090 Wien, Austria
| | - Y Yamazaki
- Ulmer Fundamental Symmetries Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
| | - J Zmeskal
- Stefan-Meyer-Institut für Subatomare Physik, Österreichische Akademie der Wissenschaften, Boltzmanngasse 3, 1090 Wien, Austria
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Cho T, Higaki H, Hirata M, Hojo H, Ichimura M, Ishii K, Itakura A, Katanuma I, Kohagura J, Nakashima Y, Saito T, Tatematsu Y, Yoshikawa M, Itoh H, Minami R, Nagashima S, Numakura T, Watanabe H, Yoshida M, Yatsu K, Miyoshi S. Summarized Scaling Laws of Plasma Confining Potential Formation and Effects in the Gamma 10 Tandem Mirror. Fusion Science and Technology 2018. [DOI: 10.13182/fst03-a11963560] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- T. Cho
- Plasma Research Centre, University of Tsukuba, Ibaraki 305-8577, Japan
| | - H. Higaki
- Plasma Research Centre, University of Tsukuba, Ibaraki 305-8577, Japan
| | - M. Hirata
- Plasma Research Centre, University of Tsukuba, Ibaraki 305-8577, Japan
| | - H. Hojo
- Plasma Research Centre, University of Tsukuba, Ibaraki 305-8577, Japan
| | - M. Ichimura
- Plasma Research Centre, University of Tsukuba, Ibaraki 305-8577, Japan
| | - K. Ishii
- Plasma Research Centre, University of Tsukuba, Ibaraki 305-8577, Japan
| | - A. Itakura
- Plasma Research Centre, University of Tsukuba, Ibaraki 305-8577, Japan
| | - I. Katanuma
- Plasma Research Centre, University of Tsukuba, Ibaraki 305-8577, Japan
| | - J. Kohagura
- Plasma Research Centre, University of Tsukuba, Ibaraki 305-8577, Japan
| | - Y. Nakashima
- Plasma Research Centre, University of Tsukuba, Ibaraki 305-8577, Japan
| | - T. Saito
- Plasma Research Centre, University of Tsukuba, Ibaraki 305-8577, Japan
| | - Y. Tatematsu
- Plasma Research Centre, University of Tsukuba, Ibaraki 305-8577, Japan
| | - M. Yoshikawa
- Plasma Research Centre, University of Tsukuba, Ibaraki 305-8577, Japan
| | - H. Itoh
- Plasma Research Centre, University of Tsukuba, Ibaraki 305-8577, Japan
| | - R. Minami
- Plasma Research Centre, University of Tsukuba, Ibaraki 305-8577, Japan
| | - S. Nagashima
- Plasma Research Centre, University of Tsukuba, Ibaraki 305-8577, Japan
| | - T. Numakura
- Plasma Research Centre, University of Tsukuba, Ibaraki 305-8577, Japan
| | - H. Watanabe
- Plasma Research Centre, University of Tsukuba, Ibaraki 305-8577, Japan
| | - M. Yoshida
- Plasma Research Centre, University of Tsukuba, Ibaraki 305-8577, Japan
| | - K. Yatsu
- Plasma Research Centre, University of Tsukuba, Ibaraki 305-8577, Japan
| | - S. Miyoshi
- Plasma Research Centre, University of Tsukuba, Ibaraki 305-8577, Japan
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7
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Cho T, Higaki H, Hirata M, Hojo H, Ichimura M, Ishii K, Islam K, Itakura A, Katanuma I, Kohagura J, Nakashima Y, Numakura T, Saito T, Tatematsu Y, Yoshikawa M, Tokioka S, Yokoyama N, Miyake Y, Tomii Y, Kojima Y, Takemura Y, Imai T, Yoshida M, Sakamoto K, Pastukhov VP, Miyoshi S. Recent Progress in the GAMMA 10 Tandem Mirror. Fusion Science and Technology 2017. [DOI: 10.13182/fst05-a601] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- T. Cho
- Plasma Research Centre, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - H. Higaki
- Plasma Research Centre, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - M. Hirata
- Plasma Research Centre, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - H. Hojo
- Plasma Research Centre, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - M. Ichimura
- Plasma Research Centre, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - K. Ishii
- Plasma Research Centre, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - K. Islam
- Plasma Research Centre, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - A. Itakura
- Plasma Research Centre, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - I. Katanuma
- Plasma Research Centre, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - J. Kohagura
- Plasma Research Centre, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - Y. Nakashima
- Plasma Research Centre, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - T. Numakura
- Plasma Research Centre, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - T. Saito
- Plasma Research Centre, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - Y. Tatematsu
- Plasma Research Centre, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - M. Yoshikawa
- Plasma Research Centre, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - S. Tokioka
- Plasma Research Centre, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - N. Yokoyama
- Plasma Research Centre, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - Y. Miyake
- Plasma Research Centre, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - Y. Tomii
- Plasma Research Centre, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - Y. Kojima
- Plasma Research Centre, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - Y. Takemura
- Plasma Research Centre, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - T. Imai
- Plasma Research Centre, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - M. Yoshida
- JAERI, Naka Fusion Research Establishment, Ibaraki, Japan
| | - K. Sakamoto
- JAERI, Naka Fusion Research Establishment, Ibaraki, Japan
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Yamaguchi Y, Ichimura M, Higaki H, Fukuyama A, Hojo H, Nemoto K, Katano M, Muro H, Kozawa I, Cho T. Effective Excitation of ICRF Waves by Use of Phased Antennas in GAMMA 10. Fusion Science and Technology 2017. [DOI: 10.13182/fst07-a1391] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Y. Yamaguchi
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - M. Ichimura
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - H. Higaki
- Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima 739-8530, Japan
| | - A. Fukuyama
- Department of Nuclear Engineering, Kyoto University, Kyoto 606-8501, Japan
| | - H. Hojo
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - K. Nemoto
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - M. Katano
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - H. Muro
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - I. Kozawa
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - T. Cho
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
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9
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Cho T, Higaki H, Hirata M, Hojo H, Ichimura M, Ishii K, Islam K, Itakura A, Katanuma I, Kohagura J, Minami R, Nakashima Y, Numakura T, Saito T, Tatematsu Y, Yoshikawa M, Watanabe O, Kubota Y, Kobayashi T, Yamaguchi Y, Saimaru H, Higashizono Y, Miyata Y, Kiminami S, Shimizu K, Itou M, Ikuno T, Mase A, Yasaka Y, Sakamoto K, Yoshida M, Kojima A, Ogura K, Nishino N, Horton W, Kariya T, Imai T, Pastukhov V, Miyoshi S. Overview of Recent Progress in the GAMMA 10 Tandem Mirror. Fusion Science and Technology 2017. [DOI: 10.13182/fst07-a1305] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- T. Cho
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - H. Higaki
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - M. Hirata
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - H. Hojo
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - M. Ichimura
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - K. Ishii
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - K. Islam
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - A. Itakura
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - I. Katanuma
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - J. Kohagura
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - R. Minami
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - Y. Nakashima
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - T. Numakura
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - T. Saito
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - Y. Tatematsu
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - M. Yoshikawa
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - O. Watanabe
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - Y. Kubota
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - T. Kobayashi
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - Y. Yamaguchi
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - H. Saimaru
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - Y. Higashizono
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - Y. Miyata
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - S. Kiminami
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - K. Shimizu
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - M. Itou
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - T. Ikuno
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - A. Mase
- Art, Science and Technology Center for Cooperative Research, Kyushu University, Japan
| | - Y. Yasaka
- Department of Electrical and Electronics Engineering, Kobe University, Japan
| | - K. Sakamoto
- Naka Fusion Research Establishment, Japan Atomic Energy Agency, Japan
| | - M. Yoshida
- Naka Fusion Research Establishment, Japan Atomic Energy Agency, Japan
| | - A. Kojima
- Naka Fusion Research Establishment, Japan Atomic Energy Agency, Japan
| | - K. Ogura
- Graduate School of Science and Technology, Niigata University, Japan
| | - N. Nishino
- Graduated School of Engineering, Hiroshima University, Japan
| | - W. Horton
- Institute for Fusion Studies, The University of Texas at Austin, USA
| | - T. Kariya
- Toshiba Electron Tubes and Devices Co. Ltd., Tochigi, Japan
| | - T. Imai
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - V.P. Pastukhov
- Russian Research Center “Kurchatov Institute”, Moscow, Russia Kurchatov Institute, Russia
| | - S. Miyoshi
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
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10
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Takeuchi N, Okada T, Kozono N, Shimoto T, Higaki H, Iwamoto Y. Symmetric Peripheral Running Sutures are Superior to Asymmetric Peripheral Running Sutures for Increasing the Tendon Strength in Flexor Tendon Repair. J Hand Surg Asian Pac Vol 2017; 22:208-213. [PMID: 28506161 DOI: 10.1142/s0218810417500265] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
BACKGROUND The fatigue strength of three peripheral suture techniques for flexor tendon repair was compared by cyclic loading of the repairs in the porcine flexor digitorum tendon. METHODS Thirty-six tendons were sutured using only peripheral sutures with 6-0 Nylon. An initial cyclic load of 10 N for 500 cycles was applied and increased by 10 N for an additional 500 cycles at each new load until rupture. RESULTS The fatigue strength of the symmetric running peripheral suture was 85.0% and 144.8% greater than that of the two kinds of the asymmetric running peripheral sutures. CONCLUSIONS Symmetric running sutures can enhance the suture strength and appears to be a useful technique for increasing the strength of the peripheral suture.
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Affiliation(s)
- N Takeuchi
- * Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, Japan
| | - T Okada
- * Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, Japan
| | - N Kozono
- * Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, Japan
| | - T Shimoto
- † Department of Information and System Engineering, Faculty of Information Engineering, Fukuoka Institute of Technology, Japan
| | - H Higaki
- ‡ Department of Biorobotics, Faculty of Engineering, Kyushu Sangyo University, Fukuoka, Japan
| | - Y Iwamoto
- * Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, Japan
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11
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Seki T, Mutoh T, Kumazawa R, Saito K, Nakamura Y, Sakamoto M, Watanabe T, Kubo S, Shimozuma T, Yoshimura Y, Igami H, Ohkubo K, Takeiri Y, Oka Y, Tsumori K, Osakabe M, Ikeda K, Nagaoka K, Kaneko O, Miyazawa J, Morita S, Narihara K, Shoji M, Masuzaki S, Goto M, Morisaki T, Peterson BJ, Sato K, Tokuzawa T, Ashikawa N, Nishimura K, Funaba H, Chikaraishi H, Takeuchi N, Notake T, Ogawa H, Torii Y, Shimpo F, Nomura G, Yokota M, Takahashi C, Kato A, Takase Y, Kasahara H, Ichimura M, Higaki H, Zhao YP, Kwak JG, Yamada H, Kawahata K, Ohyabu N, Ida K, Nagayama Y, Noda N, Watari T, Komori A, Sudo S, Motojima O. Study of Long-Pulse Plasma Experiment Using ICRF Heating in LHD. Fusion Science and Technology 2017. [DOI: 10.13182/fst06-a1234] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- T. Seki
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Mutoh
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - R. Kumazawa
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Saito
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - Y. Nakamura
- National Institute for Fusion Science, Toki 509-5292, Japan
| | | | - T. Watanabe
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Kubo
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Shimozuma
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - Y. Yoshimura
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - H. Igami
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Ohkubo
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - Y. Takeiri
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - Y. Oka
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Tsumori
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - M. Osakabe
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Ikeda
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Nagaoka
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - O. Kaneko
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - J. Miyazawa
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Morita
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Narihara
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - M. Shoji
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Masuzaki
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - M. Goto
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Morisaki
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - B. J. Peterson
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Sato
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Tokuzawa
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - N. Ashikawa
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Nishimura
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - H. Funaba
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - H. Chikaraishi
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - N. Takeuchi
- Nagoya University, Faculty of Engineering, Nagoya 464-8601, Japan
| | - T. Notake
- Nagoya University, Faculty of Engineering, Nagoya 464-8601, Japan
| | - H. Ogawa
- Graduate University for Advanced Studies, Hayama 240-0162, Japan
| | - Y. Torii
- Kyoto University, Institute of Advanced Energy, Uji 611-0011, Japan
| | - F. Shimpo
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - G. Nomura
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - M. Yokota
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - C. Takahashi
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - A. Kato
- National Institute for Fusion Science, Toki 509-5292, Japan
| | | | | | | | - H. Higaki
- University of Tsukuba, Tsukuba, Japan
| | - Y. P. Zhao
- Institute of Plasma Physics, Academia Sinica, Hefei 230031, P.R. China
| | - J. G. Kwak
- Korea Atomic Energy Research Institute, Daejeon 305-600, Korea Rep
| | - H. Yamada
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Kawahata
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - N. Ohyabu
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Ida
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - Y. Nagayama
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - N. Noda
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Watari
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - A. Komori
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Sudo
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - O. Motojima
- National Institute for Fusion Science, Toki 509-5292, Japan
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12
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Gomberoff K, Higaki H, Kaga C, Ito K, Okamoto H. Autoresonances of m=2 diocotron oscillations in non-neutral electron plasmas. Phys Rev E 2016; 94:043204. [PMID: 27841648 DOI: 10.1103/physreve.94.043204] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Indexed: 11/07/2022]
Abstract
The existence of autoresonances for m=2 diocotron oscillations of non-neutral electron plasmas in a uniform magnetic field was predicted by particle-in-cell simulations and it was confirmed in experiments. The obtained results show clear deviations from the standard threshold amplitude dependence on the sweep rate. The threshold amplitude approaches a constant at a lower sweep rate when there is a damping force. It was also found that the aspect ratio for the oval cross section of the confined plasma can be controlled by the frequency of the externally applied driving force.
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Affiliation(s)
- K Gomberoff
- Zalman Shazar 6/25, Kiryat Motzkin, Haifa 2623024, Israel
| | - H Higaki
- Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8530, Japan
| | - C Kaga
- Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8530, Japan
| | - K Ito
- Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8530, Japan
| | - H Okamoto
- Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8530, Japan
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13
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Taniguchi F, Higaki H, Izawa M, Iwabe T, Terakawa N, Harada T. Inhibitor of apoptosis protein (IAP)-2 is a novel therapeutic target for endometriosis. Fertil Steril 2012. [DOI: 10.1016/j.fertnstert.2012.07.340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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14
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Kawahara S, Matsuda S, Fukagawa S, Mitsuyasu H, Nakahara H, Higaki H, Shimoto T, Iwamoto Y. Upsizing the femoral component increases patellofemoral contact force in total knee replacement. ACTA ACUST UNITED AC 2012; 94:56-61. [PMID: 22219248 DOI: 10.1302/0301-620x.94b1.27514] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
In posterior stabilised total knee replacement (TKR) a larger femoral component is sometimes selected to manage the increased flexion gap caused by resection of the posterior cruciate ligament. However, concerns remain regarding the adverse effect of the increased anteroposterior dimensions of the femoral component on the patellofemoral (PF) joint. Meanwhile, the gender-specific femoral component has a narrower and thinner anterior flange and is expected to reduce the PF contact force. PF contact forces were measured at 90°, 120°, 130° and 140° of flexion using the NexGen Legacy Posterior Stabilized (LPS)-Flex Fixed Bearing Knee system using Standard, Upsized and Gender femoral components during TKR. Increasing the size of the femoral component significantly increased mean PF forces at 120°, 130° and 140° of flexion (p = 0.005, p < 0.001 and p < 0.001, respectively). No difference was found in contact force between the Gender and the Standard components. Among the patients who had overhang of the Standard component, mean contact forces with the Gender component were slightly lower than those of the Standard component, but no statistical difference was found at 90°, 120°, 130° or 140° of flexion (p = 0.689, 0.615, 0.253 and 0.248, respectively). Upsized femoral components would increase PF forces in deep knee flexion. Gender-specific implants would not reduce PF forces.
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Affiliation(s)
- S Kawahara
- Graduate School of Medical Sciences, Kyushu University, Department of Orthopaedic Surgery, 3-1-1, Maidashi Higashi-ku, Fukuoka City 812-8582, Japan
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15
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Takeuchi N, Mitsuyasu H, Kikuchi K, Shimoto T, Higaki H, Iwamoto Y. The biomechanical assessment of gap formation after flexor tendon repair using partial interlocking cross-stitch peripheral sutures. J Hand Surg Eur Vol 2011; 36:584-9. [PMID: 21546417 DOI: 10.1177/1753193411406632] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The gap formation of five core plus peripheral suture techniques for flexor tendon repair was evaluated by cyclic load testing. Fifty pairs of dental roll tendon models were sutured using six-strand Pennington modified Kessler core suture with 4-0 Polypropylene. One-half or three-fourths circumferential interlocking cross-stitch, or three complete circumferential peripheral suture techniques were performed using 6-0 Polypropylene. An initial cyclic load of 10 N for 500 cycles was applied and increased by 5 N for an additional 500 cycles at each new load until rupture. The complete circumferential interlocking cross-stitch had the greatest fatigue strength. The partial circumferential cross-stitches resulted in significantly larger gap formations at both the repaired and unrepaired sides than the complete circumferential sutures, and were also associated with early rupture. The full circumference of the cut tendon must be sutured using an interlocking cross-stitch peripheral suture to improve strength and avoid gap formation.
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Affiliation(s)
- N Takeuchi
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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16
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Enomoto Y, Kuroda N, Michishio K, Kim CH, Higaki H, Nagata Y, Kanai Y, Torii HA, Corradini M, Leali M, Lodi-Rizzini E, Mascagna V, Venturelli L, Zurlo N, Fujii K, Ohtsuka M, Tanaka K, Imao H, Nagashima Y, Matsuda Y, Juhász B, Mohri A, Yamazaki Y. Synthesis of cold antihydrogen in a cusp trap. Phys Rev Lett 2010; 105:243401. [PMID: 21231524 DOI: 10.1103/physrevlett.105.243401] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2010] [Indexed: 05/30/2023]
Abstract
We report here the first successful synthesis of cold antihydrogen atoms employing a cusp trap, which consists of a superconducting anti-Helmholtz coil and a stack of multiple ring electrodes. This success opens a new path to make a stringent test of the CPT symmetry via high precision microwave spectroscopy of ground-state hyperfine transitions of antihydrogen atoms.
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Affiliation(s)
- Y Enomoto
- RIKEN Advanced Science Institute, Hirosawa, Wako, Saitama 351-0198, Japan
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17
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Itoh K, Higaki H. Estimation of Ad-Hoc Network Topology based on Neighbor Relations among Wireless Nodes. Informatics 2010. [DOI: 10.2316/p.2010.724-029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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18
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Suzuki K, Higaki H. Low Overhead Multicast Routing Protocol in MANETs with Uni-Directional Links. Informatics 2010. [DOI: 10.2316/p.2010.724-035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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19
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Higaki H, Fukata K, Ito K, Okamoto H, Gomberoff K. Density and potential profiles of non-neutral electron plasmas in a magnetic mirror field. Phys Rev E Stat Nonlin Soft Matter Phys 2010; 81:016401. [PMID: 20365479 DOI: 10.1103/physreve.81.016401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2009] [Indexed: 05/29/2023]
Abstract
Low-energy non-neutral electron plasmas were confined with an electrostatic potential and a magnetic mirror field of the mirror ratio up to 5. Using a conventional phosphor screen and the unique multiring trap, both radial and axial density profiles of plasmas were measured. With the present experimental parameters, it was confirmed that a plasma density increased at higher field with an electrostatic confinement and that it decreased at higher field with a magnetic mirror confinement. The electrostatic potentials along the magnetic field were estimated with computer simulations.
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Affiliation(s)
- H Higaki
- Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
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20
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Oneda R, Higaki H. Lower Overhead Location Advertisement in Mobile Wireless Multihop Networks. Informatics 2010. [DOI: 10.2316/p.2010.724-047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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21
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Takeuchi N, Mitsuyasu H, Hotokezaka S, Miura H, Higaki H, Iwamoto Y. Strength enhancement of the interlocking mechanism in cross-stitch peripheral sutures for flexor tendon repair: biomechanical comparisons by cyclic loading. J Hand Surg Eur Vol 2010; 35:46-50. [PMID: 19786410 DOI: 10.1177/1753193409345804] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The fatigue strength of three peripheral suture techniques for flexor tendon repair was compared by cyclic loading of repairs in a cotton dental roll tendon model. Thirty pairs of dental roll were sutured using only peripheral sutures with 6-0 polypropylene. An initial cyclic load of 5 N for 500 cycles was applied and increased by 5 N for an additional 500 cycles at each new load until rupture. The fatigue strength of an interlocking cross-stitch suture was 113% greater than a running suture and 36% greater than a standard cross-stitch suture. Interlocking the cross-stitch prevented shortening of the transverse portions under load and appears to be a useful technique for increasing the strength of the peripheral suture.
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Affiliation(s)
- N Takeuchi
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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22
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Hamai S, Miura H, Higaki H, Shimoto T, Matsuda S, Iwamoto Y. Evaluation of impingement of the anterior tibial post during gait in a posteriorly-stabilised total knee replacement. ACTA ACUST UNITED AC 2008; 90:1180-5. [PMID: 18757957 DOI: 10.1302/0301-620x.90b9.20298] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Mechanical failure because of wear or fracture of the polyethylene tibial post in posteriorly-stabilised total knee replacements has been extensively described. In this study of 12 patients with a clinically and radiologically successful NexGen LPS posteriorly-stabilised prosthesis impingement of the anterior tibial post was evaluated in vivo in three dimensions during gait using radiologically-based image-matching techniques. Impingement was observed in all images of the patients during the stance phase, although the NexGen LPS was designed to accommodate 14 degrees of hyperextension of the component before impingement occurred. Impingement arises as a result of posterior translation of the femur during the stance phase. Further attention must therefore be given to the configuration of the anterior portion of the femoral component and the polyethylene post when designing posteriorly-stabilised total knee replacements.
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Affiliation(s)
- S Hamai
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
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23
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Higaki H, Ito K, Kira K, Okamoto H, Kanai Y, Yamazaki Y. Electrons Confined with an Axially Symmetric Magnetic Mirror Field. ACTA ACUST UNITED AC 2008. [DOI: 10.1063/1.2977830] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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24
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Higaki H, Ito K, Saiki W, Omori Y, Okamoto H. Properties of non-neutral electron plasmas confined with a magnetic mirror field. Phys Rev E Stat Nonlin Soft Matter Phys 2007; 75:066401. [PMID: 17677366 DOI: 10.1103/physreve.75.066401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2007] [Indexed: 05/16/2023]
Abstract
A low energy non-neutral electron plasma was confined with a magnetic mirror field and an electrostatic potential to investigate the basic confinement properties of a simple magnetic mirror trap. The mirror ratio of the magnetic field was increased up to 5. As expected the confinement time became longer as a function of the mirror ratio. The axially integrated radial density profiles in equilibrium were measured and compared with a theoretical model. The axial electrostatic oscillations of a confined electron plasma were also observed.
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Affiliation(s)
- H Higaki
- Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8530, Japan
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25
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Ando A, Tobari H, Shibata M, Isobe H, Hattori K, Inutake M, Nemoto K, Higaki H, Ichimura M. Plasma Flow Measurement by Mach Probes in GAMMA 10. Fusion Science and Technology 2007. [DOI: 10.13182/fst07-a1354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- A. Ando
- Department of Electrical Engineering, Graduate School of Engineering, Tohoku University 6-6-05, Aoba-yama, Sendai, 980-8579, JAPAN
| | - H. Tobari
- Division of Fusion Energy Technology, Japan Atomic Energy Agency
| | - M. Shibata
- Department of Electrical Engineering, Graduate School of Engineering, Tohoku University 6-6-05, Aoba-yama, Sendai, 980-8579, JAPAN
| | - H. Isobe
- Department of Electrical Engineering, Graduate School of Engineering, Tohoku University 6-6-05, Aoba-yama, Sendai, 980-8579, JAPAN
| | - K. Hattori
- Department of Electrical Engineering, Graduate School of Engineering, Tohoku University 6-6-05, Aoba-yama, Sendai, 980-8579, JAPAN
| | - M. Inutake
- Department of Electrical Engineering, Graduate School of Engineering, Tohoku University 6-6-05, Aoba-yama, Sendai, 980-8579, JAPAN
| | - K. Nemoto
- Plasma Research Center, University of Tsukuba
| | - H. Higaki
- Graduate School of Advanced Sciences of Matter, Hiroshima University
| | - M. Ichimura
- Plasma Research Center, University of Tsukuba
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Nakashima Y, Higashizono Y, Nishino N, Kawano H, Islam M, Mishima Y, Kobayashi S, Shoji M, Kubota Y, Yoshikawa M, Kobayashi T, Higaki H, Cho T. Investigation of Neutral Particles Using High Speed Camera and Monte-Carlo Simulation in the GAMMA 10 Central-Cell. Fusion Science and Technology 2007. [DOI: 10.13182/fst07-a1320] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Y. Nakashima
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - Y. Higashizono
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - N. Nishino
- Graduate school of Engineering, Hiroshima University, Hiroshima, 739-8527, Japan
| | - H. Kawano
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - M.K. Islam
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - Y. Mishima
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - S. Kobayashi
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji 611-0011, Japan
| | - M. Shoji
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - Y. Kubota
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - M. Yoshikawa
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - T. Kobayashi
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - H. Higaki
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - T. Cho
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
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Nemoto K, Ichimura M, Higaki H, Ando A, Tobari H, Isobe H, Yamaguchi Y, Hattori K, Inutake M, Katano M, Muro H, Kozawa I, Cho T. Measurement of Flow Velocity of MPD Arcjet in GAMMA 10. Fusion Science and Technology 2007. [DOI: 10.13182/fst07-a1356] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- K. Nemoto
- Plasma Research Center, University of Tsukuba
| | - M. Ichimura
- Plasma Research Center, University of Tsukuba
| | - H. Higaki
- Advanced Science of Matter, Hiroshima University, Higashi-Hiroshima
| | - A. Ando
- Department of Electrical Engineering, Tohoku University
| | - H. Tobari
- Division of Fusion Energy Technology, Japan Atomic Energy Agency
| | - H. Isobe
- Department of Electrical Engineering, Tohoku University
| | | | - K. Hattori
- Department of Electrical Engineering, Tohoku University
| | - M. Inutake
- Department of Electrical Engineering, Tohoku University
| | - M. Katano
- Plasma Research Center, University of Tsukuba
| | - H. Muro
- Plasma Research Center, University of Tsukuba
| | - I. Kozawa
- Plasma Research Center, University of Tsukuba
| | - T. Cho
- Plasma Research Center, University of Tsukuba
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Katano M, Ichimura M, Higaki H, Ide K, Kakimoto S, Yamaguchi Y, Nakagome K, Nemoto K, Cho T. Behavior of High Energy Ions During the Drift Type Instability in the GAMMA 10 Tandem Mirror. Fusion Science and Technology 2007. [DOI: 10.13182/fst07-a1378] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- M. Katano
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - M. Ichimura
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - H. Higaki
- Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima 739-8530, Japan
| | - K. Ide
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - S. Kakimoto
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - Y. Yamaguchi
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - K. Nakagome
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - K. Nemoto
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - T. Cho
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
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29
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Ichimura M, Higaki H, Kakimoto S, Yamaguchi Y, Nemoto K, Katano M, Kozawa I, Muro H, Ishikawa M, Moriyama S, Suzuki T, Watanabe T, Cho T. Wave Excitation in Magnetically Confined Plasmas with an Anisotropic Velocity Distribution. Fusion Science and Technology 2007. [DOI: 10.13182/fst07-a1337] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- M. Ichimura
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - H. Higaki
- Department of Advanced Science of Matter, Hiroshima University
| | - S. Kakimoto
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - Y. Yamaguchi
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - K. Nemoto
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - M. Katano
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - I. Kozawa
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - H. Muro
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | | | | | | | | | - T. Cho
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
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Cho T, Kohagura J, Numakura T, Hirata M, Higaki H, Hojo H, Ichimura M, Ishii K, Islam KM, Itakura A, Katanuma I, Minami R, Nakashima Y, Saito T, Tatematsu Y, Watanabe O, Yoshikawa M, Kojima A, Miyake Y, Miyata Y, Shimizu K, Tomii Y, Yoshida M, Sakamoto K, Imai T, Pastukhov VP, Miyoshi S. Observation and control of transverse energy-transport barrier due to the formation of an energetic-electron layer with sheared ExB flow. Phys Rev Lett 2006; 97:055001. [PMID: 17026107 DOI: 10.1103/physrevlett.97.055001] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2005] [Indexed: 05/12/2023]
Abstract
Off-axis electron-cyclotron heating in an axisymmetric barrier mirror produces a cylindrical layer with energetic electrons, which flow through the central cell and into the end region. The layer, producing a localized bumped ambipolar potential Phi(C), forms a strong shear of radial electric fields E(r) and peaked vorticity with the direction reversal of E(r)xB sheared flow near the Phi(C) peak. Intermittent vortexlike turbulent structures near the layer are suppressed in the central cell by this actively produced transverse energy-transport barrier; this results in T(e) and T(i) rises surrounded by the layer.
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Affiliation(s)
- T Cho
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
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32
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Heino T, Kurata K, Higaki H, Väänänen H. Development of a novel three-dimensional culture system to study the role of mechanically damaged osteocytes in the initiation of targeted bone remodeling. J Biomech 2006. [DOI: 10.1016/s0021-9290(06)84872-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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33
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Umeno T, Higaki H, Nakanishi Y, Shimoto T, Hara T. Change in servo-control ability with postural stability on aging. J Biomech 2006. [DOI: 10.1016/s0021-9290(06)84974-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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34
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Nakayama K, Matsuda S, Miura H, Iwamoto Y, Higaki H, Otsuka K. Contact stress at the post-cam mechanism in posterior-stabilised total knee arthroplasty. ACTA ACUST UNITED AC 2005; 87:483-8. [PMID: 15795197 DOI: 10.1302/0301-620x.87b4.15684] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
We measured the contact areas and contact stresses at the post-cam mechanism of a posterior-stabilised total knee arthroplasty when a posterior force of 500 N was applied to the Kirschner Performance, Scorpio Superflex, NexGen LPS Flex Fixed, and NexGen LPS Flex Mobile knee systems. Measurements were made at 90°, 120°, and 150° of flexion both in neutral rotation and 10° of internal rotation of the tibial component. Peak contact stresses at 90°, 120°, and 150° were 24.0, 33.9, and 28.8 MPa, respectively, for the Kirschner; 26.0, 32.4, and 22.1 MPa, respectively, for the Scorpio; and 34.1, 31.5, and 32.5 MPa, respectively, for the NexGen LPS Flex Fixed. With an internally rotated tibia, the contact stress increased significantly with all the fixed-bearing arthroplasties but not with the NexGen LPS Flex Mobile arthroplasty. The post-cam design should be modified in order to provide a larger contact area whilst avoiding any impingement and edge loading.
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Affiliation(s)
- K Nakayama
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
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35
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Cho T, Yoshida M, Kohagura J, Hirata M, Numakura T, Higaki H, Hojo H, Ichimura M, Ishii K, Islam KM, Itakura A, Katanuma I, Nakashima Y, Saito T, Tatematsu Y, Yoshikawa M, Kojima Y, Tokioka S, Yokoyama N, Tomii Y, Imai T, Pastukhov VP, Miyoshi S. Observation of the effects of radially sheared electric fields on the suppression of turbulent vortex structures and the associated transverse loss in GAMMA 10. Phys Rev Lett 2005; 94:085002. [PMID: 15783899 DOI: 10.1103/physrevlett.94.085002] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2004] [Indexed: 05/24/2023]
Abstract
Vortexlike turbulent structures in hot-ion mode plasmas with several keV are observed in the case with a radially produced weak shear of electric fields E(r). However, a strong E(r) shear formation due to a high ion-confining potential phi(c) production clears up these vortices together with plasma-confinement improvement and disappearance of both drift-wave and turbulencelike Fourier spectral signals. These findings are based on three-time progress in phi(c) in comparison to phi(c) attained 1992-2002. The significant advance of phi(c) is well extended in line with proposed potential-formation physics scalings.
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Affiliation(s)
- T Cho
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
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36
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Kuroda N, Torii HA, Franzen KY, Wang Z, Yoneda S, Inoue M, Hori M, Juhász B, Horváth D, Higaki H, Mohri A, Eades J, Komaki K, Yamazaki Y. Confinement of a large number of antiprotons and production of an ultraslow antiproton beam. Phys Rev Lett 2005; 94:023401. [PMID: 15698175 DOI: 10.1103/physrevlett.94.023401] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2003] [Indexed: 05/24/2023]
Abstract
We have used a radio frequency quadrupole decelerator to decelerate antiprotons emerging from the CERN Antiproton Decelerator from MeV- to keV-scale energy, and collected five decelerated pulses in a multiring trap. Some 5 x 10(6) antiprotons were stacked in this way. Cooling of the trapped antiprotons by a simultaneously trapped electron plasma was studied nondestructively via shifts in plasma mode frequencies. We have also demonstrated the first step in extracting a 10-500 eV antiproton beam from the trap.
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Affiliation(s)
- N Kuroda
- Institute of Physics, University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8902, Japan
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37
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Ichimura M, Higaki H, Kakimoto S, Yamaguchi Y, Horinouchi K, Ide K, Inoue D, Nagai H, Nakagome K, Hojo H, Saito T, Cho T. Low Frequency Fluctuations in ICRF-Heated Plasmas on GAMMA 10. Fusion Science and Technology 2005. [DOI: 10.13182/fst05-a617] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- M. Ichimura
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - H. Higaki
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - S. Kakimoto
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - Y. Yamaguchi
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - K. Horinouchi
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - K. Ide
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - D. Inoue
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - H. Nagai
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - K. Nakagome
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - H. Hojo
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - T. Saito
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - T. Cho
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
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38
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Higaki H, Ichimura M, Yamaguchi Y, Kakimoto S, Ide K, Inoue D, Nakagome K, Nagai H, Hojo H, Cho T. Measurement of Excited Fast Alfvén Waves in the GAMMA 10 Tandem Mirror. Fusion Science and Technology 2005. [DOI: 10.13182/fst05-a651] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- H. Higaki
- Plasma Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
| | - M. Ichimura
- Plasma Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
| | - Y. Yamaguchi
- Plasma Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
| | - S. Kakimoto
- Plasma Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
| | - K. Ide
- Plasma Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
| | - D. Inoue
- Plasma Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
| | - K. Nakagome
- Plasma Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
| | - H. Nagai
- Plasma Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
| | - H. Hojo
- Plasma Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
| | - T. Cho
- Plasma Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
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39
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40
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Yamaguchi Y, Ichimura M, Higaki H, Kakimoto S, Ide K, Inoue D, Nagai H, Nakagome K, Fukuyama A, Cho T. Numerical Analysis for Controlling the Eigenmode Formation of Alfvén Waves in the GAMMA 10 Tandem Mirror. Fusion Science and Technology 2005. [DOI: 10.13182/fst05-a657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Y. Yamaguchi
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - M. Ichimura
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - H. Higaki
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - S. Kakimoto
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - K. Ide
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - D. Inoue
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - H. Nagai
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - K. Nakagome
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - A. Fukuyama
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - T. Cho
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
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41
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Higaki H, Kuroda N, Yoshiki Franzen K, Wang Z, Hori M, Mohri A, Komaki K, Yamazaki Y. Radial compression of protons and H3+ ions in a multiring trap for the production of ultralow energy antiproton beams. Phys Rev E 2004; 70:026501. [PMID: 15447603 DOI: 10.1103/physreve.70.026501] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2003] [Indexed: 11/07/2022]
Abstract
Radial compression of a proton cloud was performed in a multiring trap which was designed to trap and cool a large number of antiprotons for the production of low-energy ( 10-1000 eV ) antiproton beams. The resonance frequency for the radial compression was almost constant from 3 x 10(5) to 3 x 10(6) protons. The collision process of the trapped protons was also investigated to estimate the energy of the protons inside the trap. This technique will be applied to the ASACUSA experiment at the antiproton decelerator, CERN, to extract ultraslow antiprotons with good emittance.
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Affiliation(s)
- H Higaki
- Institute of Physics, University of Tokyo, 3-8-1, Komaba, Meguro, Tokyo 153-8902 Japan
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42
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Kakimoto S, Kano H, Ichimura M, Higaki H, Saosaki S, Yamaguchi Y, Hojo H, Watanabe T, Yatsu K. Production of High Energy Ions by High Harmonic Fast Waves in the Gamma10 Tandem Mirror. Fusion Science and Technology 2003. [DOI: 10.13182/fst03-a11963569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- S. Kakimoto
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - H. Kano
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - M. Ichimura
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - H. Higaki
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - S. Saosaki
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - Y. Yamaguchi
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - H. Hojo
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - T. Watanabe
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - K. Yatsu
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
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43
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Nakashima Y, Cho T, Fukasawa T, Higaki H, Hirata M, Hojo H, Ichimura M, Ishii K, Ishimoto Y, Islam MK, Itakura A, Ito T, Katanuma I, Kobayashi S, Kohagura J, Kubota Y, Minami R, Numakura T, Saito T, Saosaki BS, Takemura Y, Tatematsu Y, Yoshida M, Yoshikawa M, Yatsu K. Recent Results of High Density Experiments in the Gamma 10 Tandem Mirror. Fusion Science and Technology 2003. [DOI: 10.13182/fst03-a11963580] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Y. Nakashima
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
| | - T. Cho
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
| | - T. Fukasawa
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
| | - H. Higaki
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
| | - M. Hirata
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
| | - H. Hojo
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
| | - M. Ichimura
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
| | - K. Ishii
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
| | - Y. Ishimoto
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
| | - M. K. Islam
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
| | - A. Itakura
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
| | - T. Ito
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
| | - I. Katanuma
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
| | - S. Kobayashi
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
- Institute of Advanced of Energy, Kyoto University, Gokasho, Uji 611-0011, Japan
| | - J. Kohagura
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
| | - Y. Kubota
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
| | - R. Minami
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
| | - T. Numakura
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
| | - T. Saito
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
| | - B. S. Saosaki
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
| | - Y. Takemura
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
| | - Y. Tatematsu
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
| | - M. Yoshida
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
| | - M. Yoshikawa
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
| | - K. Yatsu
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan ,
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44
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Ichimura M, Higaki H, Saosaki S, Kakimoto S, Yamaguchi Y, Horinouchi K, Hojo H, Yatsu K. Plasma Production and Heating with ICRF in the Gamma 10 Tandem Mirror. Fusion Science and Technology 2003. [DOI: 10.13182/fst03-a11963565] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- M. Ichimura
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - H. Higaki
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - S. Saosaki
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - S. Kakimoto
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - Y. Yamaguchi
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - K. Horinouchi
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - H. Hojo
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - K. Yatsu
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
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45
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Higaki H, Ichimura M, Kadoya K, Saosaki S, Kano H, Kakimoto S, Yamaguchi Y, Horinouchi K, Hojo H, Yatsu K. Excitation of the Low Frequency Slow Alfvén Waves Associated With the Alfvén Ion Cyclotron Waves in the Gamma 10 Tandem Mirror. Fusion Science and Technology 2003. [DOI: 10.13182/fst03-a11963596] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- H. Higaki
- Plasma Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Ibaraki 305-8577 Japan tel:+81-298-53-7473
| | - M. Ichimura
- Plasma Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Ibaraki 305-8577 Japan tel:+81-298-53-7473
| | - K. Kadoya
- Plasma Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Ibaraki 305-8577 Japan tel:+81-298-53-7473
| | - S. Saosaki
- Plasma Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Ibaraki 305-8577 Japan tel:+81-298-53-7473
| | - H. Kano
- Plasma Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Ibaraki 305-8577 Japan tel:+81-298-53-7473
| | - S. Kakimoto
- Plasma Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Ibaraki 305-8577 Japan tel:+81-298-53-7473
| | - Y. Yamaguchi
- Plasma Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Ibaraki 305-8577 Japan tel:+81-298-53-7473
| | - K. Horinouchi
- Plasma Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Ibaraki 305-8577 Japan tel:+81-298-53-7473
| | - H. Hojo
- Plasma Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Ibaraki 305-8577 Japan tel:+81-298-53-7473
| | - K. Yatsu
- Plasma Research Center, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, Ibaraki 305-8577 Japan tel:+81-298-53-7473
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46
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Higaki H, Kuroda N, Ichioka T, Franzen KY, Wang Z, Komaki K, Yamazaki Y, Hori M, Oshima N, Mohri A. Electron cooling of high-energy protons in a multiring trap with a tank circuit monitoring the electron-plasma oscillations. Phys Rev E Stat Nonlin Soft Matter Phys 2002; 65:046410. [PMID: 12006026 DOI: 10.1103/physreve.65.046410] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2001] [Indexed: 05/23/2023]
Abstract
Electron cooling of energetic protons in a multiring trap was investigated experimentally with a tank circuit monitoring electron-plasma oscillations in the trap. The energy of protons was determined by time-of-flight measurements. It is found that a simple model can explain the qualitative behavior of both electron and proton energy when the initial energy of protons is less than 2 keV. Monitoring the electron-plasma temperature with a tank circuit can be an effective tool when energetic particles are electron cooled in a multiring trap.
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Affiliation(s)
- H Higaki
- Institute of Physics, University of Tokyo, 3-8-1, Komaba, Meguro, Tokyo 153-8902, Japan
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47
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Kurata K, Uemura T, Nemoto A, Tateishi T, Murakami T, Higaki H, Miura H, Iwamoto Y. Mechanical strain effect on bone-resorbing activity and messenger RNA expressions of marker enzymes in isolated osteoclast culture. J Bone Miner Res 2001; 16:722-30. [PMID: 11316000 DOI: 10.1359/jbmr.2001.16.4.722] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Adaptive modeling and remodeling are controlled by the activities of osteoblasts and osteoclasts, which are capable of sensing their mechanical environments and regulating deposition or resorption of bone matrix. The effects of mechanical stimuli on isolated osteoclasts have been scarcely examined because it has proven to be difficult to prepare a number of pure osteoclasts and to cultivate them on mineralized substratum during mechanical stimulation. Recently, we developed an apparatus for applying mechanical stretching to the ivory slice/plastic plate component on which cells could be cultured. The loading frequency, strain rate, and generated strain over an ivory surface could be controlled by a personal computer. Using this apparatus, we examined the role of mechanical stretching on the bone-resorbing activity of the osteoclasts. Mature and highly enriched osteoclasts were cultured for 2, 12, and 24 h on the ivory/plate component while being subjected to intermittent tensile strain. The stretched osteoclasts showed enhanced messenger RNA (mRNA) expression levels of osteoclast marker enzymes, tartrate-resistant acid phosphatase (TRAP), and cathepsin K and increases of resorbed-pit formation, suggesting that the mechanical stretching up-regulated the bone-resorbing activity of the osteoclasts. A stretch-activated cation (SA-cat) channel blocker significantly inhibited the increases of the mRNA level and pit formation after 24 h of stretching. This study suggested the possibility that the mature osteoclasts responded to mechanical stretching through a mechanism involving a SA-cat channel in the absence of mesenchymal cells and, as a result, up-regulated their bone-resorbing activity.
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Affiliation(s)
- K Kurata
- Department of Intelligent Machinery and Systems, Graduate School of Engineering, Kyushu University, Fukuoka, Japan
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48
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Mawatari T, Miura H, Higaki H, Moro-Oka T, Kurata K, Murakami T, Iwamoto Y. Effect of vitamin K2 on three-dimensional trabecular microarchitecture in ovariectomized rats. J Bone Miner Res 2000; 15:1810-7. [PMID: 10977000 DOI: 10.1359/jbmr.2000.15.9.1810] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Menatetrenone, a vitamin K2 with four isoprene units, has been reported to improve osteoporotic bone loss. The purpose of this investigation was to clarify the effect of menatetrenone on the three-dimensional (3D) trabecular microarchitecture in ovariectomized (OVX) rats by using microcomputed tomography (MCT). Forty-two 13-week-old female rats were used and divided into four groups: the OVX (OVX + MK-4) group treated with menatetrenone, the (OVX untreated) group, the sham-operated (Sham + MK-4) group treated with menatetrenone, and the sham-operated group not treated with menatetrenone (Sham untreated) group. OVX rats were fed a calcium-deficient diet. Menatetrenone treatment was begun just after the ovariectomy, and the mean menatetrenone oral intake over the 8-week period was adjusted to 30 mg/kg BW per day. The proximal metaphyseal region of the right tibia was evaluated by dual X-ray absorptiometry (DXA) and MCT. A parametric analysis of the reconstructed trabecular volume was carried out using bone volume fractions, the fractal dimension calculated by the 3D box-counting method, and the connectivity density as determined by topological analysis. Menatetrenone significantly increased the trabecular bone volume, fractal dimension, and connectivity in the OVX + MK-4 group compared with the OVX-untreated group (p < 0.01). Our results suggest that an 8-week administration of menatetrenone protects against the loss of trabecular bone volume and its connectivity when treatment is begun just after the ovariectomy. Despite this apparent protection, it remains unknown whether it is possible to reestablish trabecular connectivity if therapeutic intervention occurs after the trabecular connectivity has been lost.
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Affiliation(s)
- T Mawatari
- Department of Orthopedic Surgery, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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49
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Moro-oka T, Miura H, Mawatari T, Kawano T, Nakanishi Y, Higaki H, Iwamoto Y. Mixture of hyaluronic acid and phospholipid prevents adhesion formation on the injured flexor tendon in rabbits. J Orthop Res 2000; 18:835-40. [PMID: 11117308 DOI: 10.1002/jor.1100180523] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Dipalmitoyl phosphatidylcholine, a highly surface-active polar lipid, has been implicated as a potential boundary lubricant for synovial joints. We examined the effects of dipalmitoyl phosphatidylcholine on the flexor tendon and its protective effect against postoperative adhesion in two experimental steps. First, the flexor digitorum fibularis and the distal pulley of rabbits were set for a friction test. The test was performed with saline solution, sodium hyaluronate, or a mixture of dipalmitoyl phosphatidylcholine and sodium hyaluronate as the lubricant. The friction coefficient was significantly lower with the mixture of dipalmitoyl phosphatidylcholine and sodium hyaluronate than with saline solution or sodium hyaluronate. We concluded that the decreased friction coefficient indicates that dipalmitoyl phosphatidylcholine could complement the boundary-lubricating ability of the tendon. In the second experiment, we used an experimental adhesion model of the flexor digitorum fibularis in the rabbit. During the operation, either saline solution, sodium hyaluronate, or a mixture of dipalmitoyl phosphatidylcholine and sodium hyaluronate was injected into the tendon sheath. The specimen was sent to another tester, and the work required to tear off the adhesion was measured. The work required was significantly greater for the tendons that had been injected with saline solution than for those given injections of dipalmitoyl phosphatidylcholine and sodium hyaluronate. Our findings suggest that dipalmitoyl phosphatidylcholine plays an important role in the boundary lubrication of the tendon and that after tendon injury, the administration of a mixture of dipalmitoyl phosphatidylcholine and sodium hyaluronate may improve tendon lubrication and prevent adhesion formation.
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Affiliation(s)
- T Moro-oka
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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50
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Nakanishi Y, Murakami T, Higaki H. Adsorption control of synovia constituents on artificial joint materials by means of an electric field: evaluation of tribological characteristics. Proc Inst Mech Eng H 2000; 214:181-92. [PMID: 10825775 DOI: 10.1243/0954411001535345] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The supplemental lubrication mechanism by means of an electric field was proposed to reduce friction and wear for the advanced joint prosthesis with the low elastic modulus bearing surface. The possibility of application of this mechanism to the prosthesis was investigated by the fundamental and experimental procedures in simplified sliding conditions. Conductive silicon rubber was used as the low elastic modulus surface. The counterfaces were a titanium alloy and a stainless steel. Protein (gamma-globulin) in lubricant appeared to cause the tribological characteristic to deteriorate in the mixed lubrication regime. High friction seemed to be brought about by the obstruction against the entraining of the fluid flow and the high shear stress due to the microbonding between the asperities of bearing surfaces, which were derived from the adsorbed protein on the hydrophobic surfaces. The repulsive force between the adsorbed film and the bearing materials by means of the d.c. electric field, and the continuous change in polarity on the surface by means of the a.c. electric field appeared to affect the adsorbed film adjacent to the bearing material, so that friction and wear were varied.
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Affiliation(s)
- Y Nakanishi
- Department of Human Welfare Engineering, Faculty of Engineering, Oita University, Japan.
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