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Lepine NN, Tajima T, Ogasawara T, Kasahara R, Koizumi H. Robust respiration rate estimation using adaptive Kalman filtering with textile ECG sensor and accelerometer. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2017; 2016:3797-3800. [PMID: 28269113 DOI: 10.1109/embc.2016.7591555] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
An adaptive Kalman filter-based fusion algorithm capable of estimating respiration rate for unobtrusive respiratory monitoring is proposed. Using both signal characteristics and a priori information, the Kalman filter is adaptively optimized to improve accuracy. Furthermore, the system is able to combine the respiration-related signals extracted from a textile ECG sensor and an accelerometer to create a single robust measurement. We measured derived respiratory rates and, when compared to a reference, found root-mean-square error of 2.11 breaths-per-minute (BrPM) while lying down, 2.30 BrPM while sitting, 5.97 BrPM while walking, and 5.98 BrPM while running. These results demonstrate that the proposed system is applicable to unobtrusive monitoring for various applications.
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Sekimoto T, Ishii M, Emi M, Kurogi S, Funamoto T, Yonezawa Y, Tajima T, Sakamoto T, Hamada H, Chosa E. Copy number loss in the region of the ASPN gene in patients with acetabular dysplasia: ASPN CNV in acetabular dysplasia. Bone Joint Res 2017; 6:439-445. [PMID: 28747338 PMCID: PMC5539304 DOI: 10.1302/2046-3758.67.bjr-2016-0094.r1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2016] [Accepted: 05/15/2017] [Indexed: 11/25/2022] Open
Abstract
Objectives We have previously investigated an association between the genome copy number variation (CNV) and acetabular dysplasia (AD). Hip osteoarthritis is associated with a genetic polymorphism in the aspartic acid repeat in the N-terminal region of the asporin (ASPN) gene; therefore, the present study aimed to investigate whether the CNV of ASPN is involved in the pathogenesis of AD. Methods Acetabular coverage of all subjects was evaluated using radiological findings (Sharp angle, centre-edge (CE) angle, acetabular roof obliquity (ARO) angle, and minimum joint space width). Genomic DNA was extracted from peripheral blood leukocytes. Agilent’s region-targeted high-density oligonucleotide tiling microarray was used to analyse 64 female AD patients and 32 female control subjects. All statistical analyses were performed using EZR software (Fisher’s exact probability test, Pearson’s correlation test, and Student’s t-test). Results CNV analysis of the ASPN gene revealed a copy number loss in significantly more AD patients (9/64) than control subjects (0/32; p = 0.0212). This loss occurred within a 60 kb region on 9q22.31, which harbours the gene for ASPN. The mean radiological parameters of these AD patients were significantly worse than those of the other subjects (Sharp angle, p = 0.0056; CE angle, p = 0.0076; ARO angle, p = 0.0065), and all nine patients required operative therapy such as total hip arthroplasty or pelvic osteotomy. Moreover, six of these nine patients had a history of operative or conservative therapy for developmental dysplasia of the hip. Conclusions Copy number loss within the region harbouring the ASPN gene on 9q22.31 is associated with severe AD. A copy number loss in the ASPN gene region may play a role in the aetiology of severe AD. Cite this article: T. Sekimoto, M. Ishii, M. Emi, S. Kurogi, T. Funamoto, Y. Yonezawa, T. Tajima, T. Sakamoto, H. Hamada, E. Chosa. Copy number loss in the region of the ASPN gene in patients with acetabular dysplasia: ASPN CNV in acetabular dysplasia. Bone Joint Res 2017;6:439–445. DOI: 10.1302/2046-3758.67.BJR-2016-0094.R1.
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Gota H, Tuszewski M, Trask E, Garate E, Binderbauer MW, Tajima T, Schmitz L, Deng BH, Guo HY, Aefsky S, Allfrey I, Barnes D, Bolte N, Bui DQ, Ceccherini F, Clary R, Conroy KD, Cordero M, Dettrick SA, Douglass JD, Feng P, Granstedt E, Gupta D, Gupta S, Hooper C, Kinley JS, Knapp K, Korepanov S, Longman A, Magee R, Mendoza R, Mok Y, Necas A, Primavera S, Putvinski S, Onofri M, Osin D, Rath N, Roche T, Romero J, Rostoker N, Schroeder JH, Sevier L, Sibley A, Smirnov A, Song Y, Steinhauer LC, Thompson MC, Valentine T, Van Drie AD, Walters JK, Waggoner W, Yang X, Yushmanov P, Zhai K. Improved Confinement of C-2 Field-Reversed Configuration Plasmas. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst14-871] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Kurniawan K, Tajima T, Kubo Y, Miyake H, Kurashige W, Negishi Y, Takaguchi Y. Incorporating a TiOx shell in single-walled carbon nanotube/fullerodendron coaxial nanowires: increasing the photocatalytic evolution of H2 from water under irradiation with visible light. RSC Adv 2017. [DOI: 10.1039/c7ra05412b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The SWCNT/fullerodendron/TiOx coaxial nanowire shows an enhanced photocatalytic activity (Φ = 0.47) for the evolution of hydrogen from water under irradiation with visible light (λ = 450 nm).
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Matsumoto T, Roche T, Allfrey I, Sekiguchi J, Asai T, Gota H, Cordero M, Garate E, Kinley J, Valentine T, Waggoner W, Binderbauer M, Tajima T. Characterization of compact-toroid injection during formation, translation, and field penetration. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:11D406. [PMID: 27910693 DOI: 10.1063/1.4959571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We have developed a compact toroid (CT) injector system for particle refueling of the advanced beam-driven C-2U field-reversed configuration (FRC) plasma. The CT injector is a magnetized coaxial plasma gun (MCPG), and the produced CT must cross the perpendicular magnetic field surrounding the FRC for the refueling of C-2U. To simulate this environment, an experimental test stand has been constructed. A transverse magnetic field of ∼1 kG is established, which is comparable to the C-2U axial magnetic field in the confinement section, and CTs are fired across it. On the test stand we have been characterizing and studying CT formation, ejection/translation from the MCPG, and penetration into transverse magnetic fields.
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Tajima T, Wada T, Yoshizawa A, Masuda T, Okafuji T, Nakayama T, Hasuo K. Internal anomalies in thalidomide embryopathy: results of imaging screening by CT and MRI. Clin Radiol 2016; 71:1199.e1-7. [PMID: 27567725 DOI: 10.1016/j.crad.2016.07.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2015] [Revised: 06/09/2016] [Accepted: 07/25/2016] [Indexed: 11/29/2022]
Abstract
AIM To examine the prevalence and detailed radiological findings of internal anomalies in thalidomide embryopathy (TE). MATERIALS AND METHODS Whole-body image screening for internal anomalies using unenhanced whole-body computed tomography (CT) and head magnetic resonance imaging (MRI) was performed in 22 patients (13 women and nine men; mean age, 49 years; range, 47-51 years) with TE. RESULTS Among the 22 patients with TE, internal anomalies were detected in 19 (86.4%): anomalies of the auditory organ in 10 (45.5%), anomalies of the vascular system in six (27.3%), agenesis of the gallbladder in six (27.3%), hypoplasia or aplasia of the 7th or 8th cranial nerves in five (22.7%), block vertebrae in five (22.7%), fusion of the left lobe and quadrate lobe of the liver in three (9.1%), and others in five (22.7%), respectively. CONCLUSION In addition to limb defects or hypoplasia, various internal anomalies can be detected at a high incidence in TE using CT and MRI. Understanding these characteristic radiological findings may help radiologists detect a wide range of radiological findings of internal anomalies associated with TE.
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Matsumoto T, Sekiguchi J, Asai T, Gota H, Garate E, Allfrey I, Valentine T, Morehouse M, Roche T, Kinley J, Aefsky S, Cordero M, Waggoner W, Binderbauer M, Tajima T. Development of a magnetized coaxial plasma gun for compact toroid injection into the C-2 field-reversed configuration device. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:053512. [PMID: 27250428 DOI: 10.1063/1.4952581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A compact toroid (CT) injector was developed for the C-2 device, primarily for refueling of field-reversed configurations. The CTs are formed by a magnetized coaxial plasma gun (MCPG), which consists of coaxial cylindrical electrodes and a bias coil for creating a magnetic field. First, a plasma ring is generated by a discharge between the electrodes and is accelerated by Lorenz self-force. Then, the plasma ring is captured by an interlinkage flux (poloidal flux). Finally, the fully formed CT is ejected from the MCPG. The MCPG described herein has two gas injection ports that are arranged tangentially on the outer electrode. A tungsten-coated inner electrode has a head which can be replaced with a longer one to extend the length of the acceleration region for the CT. The developed MCPG has achieved supersonic CT velocities of ∼100 km/s. Plasma parameters for electron density, electron temperature, and the number of particles are ∼5 × 10(21) m(-3), ∼40 eV, and 0.5-1.0 × 10(19), respectively.
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Amano K, Maeda I, Morita T, Miura T, Inoue S, Ikenaga M, Matsumoto Y, Baba M, Sekine R, Yamaguchi T, Hirohashi T, Tajima T, Tatara R, Watanabe H, Otani H, Takigawa C, Matsuda Y, Nagaoka H, Mori M, Kinoshita H. 1510 Clinical implications of C-reactive protein as a prognostic marker in advanced cancer patients in palliative settings. Eur J Cancer 2015. [DOI: 10.1016/s0959-8049(16)30600-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Kizaki K, Terada T, Arikawa H, Tajima T, Imai H, Takahashi T, Era S. Effect of reduced coenzyme Q10 (ubiquinol) supplementation on blood pressure and muscle damage during kendo training camp: a double-blind, randomized controlled study. J Sports Med Phys Fitness 2015; 55:797-804. [PMID: 25369277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
AIM This randomized controlled study was designed to examine the effects of reduced coenzyme Q10 (ubiquinol; CoQ10) supplementation on blood pressure (BP) and exercise-induced muscle damage in kendo athletes during a 4-day kendo training camp. METHODS In a double-blinded manner, 32 young kendo athletes were randomly assigned to supplement with either placebo or CoQ10 (600 mg) daily for 11 days from 1 week prior to camp to end of camp. BP was measured every morning after waking up during the training camp. Blood samples were taken at 3 time points; 1 week and 1 day prior and upon completion of training camp at 17:30. Statistical analysis was performed by repeated-measures analysis of variance followed by Bonferroni/Dunn post-hoc tests. RESULTS Before the training camp started, there were no differences in diastolic BP between these groups. However, after kendo training started, diastolic BP in the CoQ10 group was significantly lower than that in the placebo group (P<0.05). Plasma creatine kinase (CK) and myoglobin (Mb) concentrations were significantly increased in both groups during the camp (P<0.05), whereas there were no significant differences in CK and Mb between CoQ10 and placebo groups (CK: P=0.82, Mb: P=0.69). CONCLUSION Oral supplementation with reduced form of CoQ10 (ubiquinol; Kaneka QHTM) showed a significant hypotensive effect in young male kendo athletes during a 4-day kendo training camp, although it did not significantly ameliorate kendo exercise-induced muscle damage.
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Shiraga K, Suzuki T, Kondo N, Tajima T, Nakamura M, Togo H, Hirata A, Ajito K, Ogawa Y. Broadband dielectric spectroscopy of glucose aqueous solution: Analysis of the hydration state and the hydrogen bond network. J Chem Phys 2015; 142:234504. [DOI: 10.1063/1.4922482] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Guo HY, Binderbauer MW, Tajima T, Milroy RD, Steinhauer LC, Yang X, Garate EG, Gota H, Korepanov S, Necas A, Roche T, Smirnov A, Trask E. Achieving a long-lived high-beta plasma state by energetic beam injection. Nat Commun 2015; 6:6897. [DOI: 10.1038/ncomms7897] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Accepted: 03/11/2015] [Indexed: 11/09/2022] Open
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Morita S, Tajima T, Yamazaki H, Sonoyama Y, Nishina Y, Kenji O, Takagi T, Kondo T, Tanabe K, Sakai S. Screening of renal artery pseudoaneurysms by early postoperative contrast-enhanced computed tomography in patients without renal impairment after partial nephrectomy and prophylactic embolization. J Vasc Interv Radiol 2015. [DOI: 10.1016/j.jvir.2014.12.289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Schmitz L, Ruskov E, Deng BH, Gota H, Gupta D, Tuszewski M, Douglass J, Peebles WA, Binderbauer M, Tajima T. Multi-channel Doppler backscattering measurements in the C-2 field reversed configuration. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:11D840. [PMID: 25430253 DOI: 10.1063/1.4891415] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A versatile heterodyne Doppler Backscattering (DBS) system is used to measure density fluctuation levels (in the wavenumber range kρs ≤ 50), and the toroidal E × B flow velocity in the C-2 Field-Reversed Configuration (FRC). Six tunable frequencies in three waveguide bands (26 GHz ≤ f ≤ 90 GHz) are launched using monostatic beam optics, via a quasi-optical beam combiner/polarizer and an adjustable parabolic focusing mirror (inside the vacuum enclosure) achieving Gaussian beam spot sizes of 3-5.5 cm at the X/O-mode cutoff. The DBS system covers plasma densities of 0.8 × 10(13) ≤ ne ≤ 1 × 10(14) cm(-3), and provides access to the FRC core (up to the field null) and across the FRC separatrix into the scrape-off layer plasma.
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Murakami H, Seto T, Takahashi T, Horiike A, Hirai F, Suenaga N, Tajima T, Tokushige K, Boral A, Robson M, Nishio M. Phase I Study for Ceritinib (Ldk378) in Japanese Patients with Alk Genetic Alterations. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu349.73] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Tajima T, Chosa E, Kawahara K, Nakamura Y, Yoshikawa D, Yamaguchi N, Kashiwagi T. Comprehensive safety management and assessment at rugby football competitions. Int J Sports Med 2014; 35:1012-6. [PMID: 24838268 DOI: 10.1055/s-0034-1372634] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
The present study aims to improve medical systems by designing objective safety assessment criteria for rugby competitions. We evaluated 195 competitions between 2002 and 2011 using an original safety scale comprising the following sections: 1) competence of staff such as referees, medical attendants and match day doctor; 2) environment such as weather, wet bulb globe temperature and field conditions; and 3) emergency medical care systems at the competitions. Each section was subdivided into groups A, B and C according to good, normal or fair degrees of safety determined by combinations of the results.Overall safety was assessed as A, B and C for 110, 78 and 7 competitions, respectively. The assessments of individual major factors were mostly favorable for staff, but the environment and medical care systems were assessed as C in 25 and 70, respectively, of the 195 competitions. Medical management involves not having a match day doctor, but also comprehensive management including preventive factors and responses from the staff, environment and medical-care systems. 6 cases of severe injuries and accidents occurred between 2002 and 2011, which were observed in Grade A competition. These cases revealed better prognosis without obvious impairment, thus confirming the value of the present assessment scale.
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Kurita K, Tajima T, Ogi N, Yuasa H, Fukuta K. Mouth-opening exercise-based treatment algorithm for temporomandibular joint pain and trismus caused by disk displacement without reduction. Int J Oral Maxillofac Surg 2013. [DOI: 10.1016/j.ijom.2013.07.690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Stora C, Devouche E, Delaroche L, Patrat C, Matheron S, Damond F, Yazbeck C, Longuet P, Llabador MA, Luton D, Epelboin S, Lemmen J, Rasmussen S, Ziebe S, El Khattabi L, Hafhouf E, Royere D, Pouly JL, De Mouzon J, Levy R, Hagman A, Loft A, Wennerholm UB, Pinborg A, Bergh C, Aittomaki K, Nygren KG, Romundstad LB, Hazekamp J, Soderstrom-Anttila V, Mukaida T, Goto T, Tajima T, Oka C, Takahashi K, Carrasco B, Boada M, Rodriguez I, Coroleu B, Barri PN, Veiga A, Wennerholm UB, Henningsen AKA, Romundstad LB, Bergh C, Pinborg A, Skjaerven R, Forman J, Gissler M, Nygren KG, Tiitinen A. Session 60: Perinatal outcome after ART. Hum Reprod 2013. [DOI: 10.1093/humrep/det193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Gota H, Tuszewski M, Smirnov A, Korepanov S, Akhmetov T, Ivanov A, Voskoboynikov R, Binderbauer MW, Guo HY, Barnes D, Aefsky S, Brown R, Bui DQ, Clary R, Conroy KD, Deng BH, Dettrick SA, Douglass JD, Garate E, Glass FJ, Gupta D, Gupta S, Kinley JS, Knapp K, Hollins M, Longman A, Li XL, Luo Y, Mendoza R, Mok Y, Necas A, Primavera S, Osin D, Rostoker N, Ruskov E, Schmitz L, Schroeder JH, Sevier L, Sibley A, Song Y, Sun X, Tajima T, Thompson MC, Trask E, Van Drie AD, Walters JK, Wyman MD, Zhai K. A High Performance Field-Reversed Configuration Regime in the C-2 Device. FUSION SCIENCE AND TECHNOLOGY 2013. [DOI: 10.13182/fst13-a16890] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Okusaka T, Ito T, Ikeda M, Igarashi H, Morizane C, Nakachi K, Tajima T, Kasuga A, Fujita Y, Furuse J. Phase III Trial of Everolimus in Advanced Pancreatic Neuroendocrine Tumors (RADIANT-3): Overall Population and Japanese Subgroup Analysis. Ann Oncol 2012. [DOI: 10.1016/s0923-7534(20)31952-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Mukaida T, Goto T, Tajima T, Oka C, Takahashi K. Perinatal outcome of children born after vitrification of blastocysts (6467 cycles with 2059 babies in 12 years experiences). Fertil Steril 2012. [DOI: 10.1016/j.fertnstert.2012.07.231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Kiriyama H, Shimomura T, Sasao H, Nakai Y, Tanoue M, Kondo S, Kanazawa S, Pirozhkov AS, Mori M, Fukuda Y, Nishiuchi M, Kando M, Bulanov SV, Nagashima K, Yamagiwa M, Kondo K, Sugiyama A, Bolton PR, Tajima T, Miyanaga N. Temporal contrast enhancement of petawatt-class laser pulses. OPTICS LETTERS 2012; 37:3363-3365. [PMID: 23381258 DOI: 10.1364/ol.37.003363] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We demonstrate the temporal contrast enhancement in a petawatt-class Ti:sapphire chirped-pulse amplification (CPA) laser system. An extra saturable absorber, introduced downstream after a low-gain optical parametric chirped-pulse amplification (OPCPA) preamplifier, has improved the temporal contrast in the system to 1.4×10(12) on the subnanosecond time scale at 70 TW power level. We have achieved 28 J of uncompressed broadband output energy with this system, indicating the potential for reaching peak powers near 600 TW.
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Camou S, Haga T, Tajima T, Tamechika E. Detection of aqueous glucose based on a cavity size- and optical-wavelength-independent continuous-wave photoacoustic technique. Anal Chem 2012; 84:4718-24. [PMID: 22548281 DOI: 10.1021/ac203331w] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Toward the achievement of noninvasive and continuous monitoring of blood glucose level, we developed a new measurement method based on the continuous-wave photoacoustic (CW-PA) technique and performed the first validation in vitro with calibrated aqueous glucose solutions. The PA technique has been studied in the past but exclusively based on the pulse setup since the CW one exhibits dependence on the cavity dimensions, which is not compatible with the final application requirements. This paper describes a new strategy relying on the monitoring of the resonant-frequency relative shift induced by the change of glucose concentrations rather than amplitude signal levels at a fixed frequency. From in vitro results, we demonstrate a stable and reproducible response to glucose at various cavity dimensions and optical wavelengths, with a slope of 0.19 ±0.01%/g/dL. From theoretical considerations, this method is consistent with a relative acoustic velocity measurement, which also explains the aforementioned stability. The proposed method then resolves most of the issues usually associated with the CW-PA technique and makes it a potential alternative for the noninvasive and continuous monitoring of glycemia levels. However, experimental determination of sensor responses to albumin and temperature as two potential interferents shows similar levels, which points to the selectivity to glucose as a major issue we should deal with in future development.
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Pirozhkov AS, Kando M, Esirkepov TZ, Gallegos P, Ahmed H, Ragozin EN, Faenov AY, Pikuz TA, Kawachi T, Sagisaka A, Koga JK, Coury M, Green J, Foster P, Brenner C, Dromey B, Symes DR, Mori M, Kawase K, Kameshima T, Fukuda Y, Chen L, Daito I, Ogura K, Hayashi Y, Kotaki H, Kiriyama H, Okada H, Nishimori N, Imazono T, Kondo K, Kimura T, Tajima T, Daido H, Rajeev P, McKenna P, Borghesi M, Neely D, Kato Y, Bulanov SV. Soft-x-ray harmonic comb from relativistic electron spikes. PHYSICAL REVIEW LETTERS 2012; 108:135004. [PMID: 22540709 DOI: 10.1103/physrevlett.108.135004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2011] [Indexed: 05/31/2023]
Abstract
We demonstrate a new high-order harmonic generation mechanism reaching the "water window" spectral region in experiments with multiterawatt femtosecond lasers irradiating gas jets. A few hundred harmonic orders are resolved, giving μJ/sr pulses. Harmonics are collectively emitted by an oscillating electron spike formed at the joint of the boundaries of a cavity and bow wave created by a relativistically self-focusing laser in underdense plasma. The spike sharpness and stability are explained by catastrophe theory. The mechanism is corroborated by particle-in-cell simulations.
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Tajima T, Haberkorn NF, Civale L, Schulze RK, Inoue H, Guo J, Dolgashev VA, Martin D, Tantawi S, Yoneda C, Moeckly B, Yung C, Proslier T, Pellin M, Matsumoto A, Watanabe E. Studies on thin film MgB2 for applications to RF structures for particle accelerators. ACTA ACUST UNITED AC 2012. [DOI: 10.1063/1.4712109] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Jung D, Yin L, Albright BJ, Gautier DC, Hörlein R, Kiefer D, Henig A, Johnson R, Letzring S, Palaniyappan S, Shah R, Shimada T, Yan XQ, Bowers KJ, Tajima T, Fernández JC, Habs D, Hegelich BM. Monoenergetic ion beam generation by driving ion solitary waves with circularly polarized laser light. PHYSICAL REVIEW LETTERS 2011; 107:115002. [PMID: 22026679 DOI: 10.1103/physrevlett.107.115002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2011] [Indexed: 05/31/2023]
Abstract
Experimental data from the Trident Laser facility is presented showing quasimonoenergetic carbon ions from nm-scaled foil targets with an energy spread of as low as ±15% at 35 MeV. These results and high-resolution kinetic simulations show laser acceleration of quasimonoenergetic ion beams by the generation of ion solitons with circularly polarized laser pulses (500 fs, λ=1054 nm). The conversion efficiency into monoenergetic ions is increased by an order of magnitude compared with previous experimental results, representing an important step towards applications such as ion fast ignition.
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