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Rodriguez S, Vasquez L, Costa D, Romero A, Santos A. Oxidation of Orange G by persulfate activated by Fe(II), Fe(III) and zero valent iron (ZVI). CHEMOSPHERE 2014; 101:86-92. [PMID: 24439838 DOI: 10.1016/j.chemosphere.2013.12.037] [Citation(s) in RCA: 140] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Revised: 12/11/2013] [Accepted: 12/12/2013] [Indexed: 06/03/2023]
Abstract
Persulfate (PS) was employed in the oxidation of Orange G (OG), an azo dye commonly found in textile wastewaters. Activation of PS was conducted with iron to generate sulfate free radicals (SO4(-)) with high redox potential capable to oxidize most of the organics in water. Identification of oxidation intermediates was carried out by analyzing at different times organic by-products generated from treatment of a concentrate dye solution (11.6 mM) with 153 mM of PS and 20 mM of Fe(II) at 20 °C. Intermediate reaction products (mainly phenol (PH) and benzoquinone (BQ), and in less extent aniline, phenolic compounds and naphthalene type compounds with quinone groups) were identified by GC/MS and HPLC, and an oxidation pathway was proposed for the oxidation of OG with iron activated PS. The effect of iron valence (0, II and III) in the oxidation of an aqueous solution of OG (containing 0.1 mM) was studied in a 0.5 L batch reactor at 20 °C. Initial activator and PS concentrations employed were both 1 mM. Complete pollutant removal was achieved within the first 30 min when iron II or III were employed as activators. Quinone intermediates generated during pollutant oxidation may act as electron shuttles, allowing the reduction of Fe(III) into Fe(II) in the redox cycling of iron. Therefore, activation of PS by Fe(III) allowed complete OG removal. When zero valent iron (ZVI) was employed (particle diameter size 0.74 mm) the limiting step in SO4(-) generation was the surface reaction between ZVI and the oxidant yielding a lower oxidation rate of the dye. An increase in the oxidant dosage (0.2 mM OG, 2 mM Fe(III) and 6 mM PS) allowed complete pollutant and ecotoxicity removal, as well as mineralization close to 75%.
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Torres R, Garcia A, Jimenez M, Rodriguez S, Ramirez JC. An integration-defective lentivirus-based resource for site-specific targeting of an edited safe-harbour locus in the human genome. Gene Ther 2014; 21:343-52. [DOI: 10.1038/gt.2014.1] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Revised: 11/25/2013] [Accepted: 12/20/2013] [Indexed: 12/29/2022]
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Tejera B, Grados D, Martinez-Morillo M, Riveros A, Rodriguez S, Mateo L, Holgado S, Olivé A, Tena X. AB0354 Adult onset still’s disease (AOSD):A report of 30 cases. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2012-eular.354] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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79
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Rodriguez S, Leung M, Charlebois A, Sellick J, Haldorsen M. The Implementation of ‘Emergent Champions’ on a Step-Down Cardiac Ward: Facilitating a Proactive Culture of Self-Learning. Can J Cardiol 2013. [DOI: 10.1016/j.cjca.2013.07.747] [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] Open
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80
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Papanikolaou N, Komisopoulos G, Rodriguez S, Stathakis S, Esquivel C, Nikiforidis G, Sakellaropoulos G, Mavroidis P. SU-E-T-488: Secondary Malignancy Risks in Lung Cancer Radiotherapy with Helical Tomotherapy, Intensity Modulated Radiotherapy, and Conformal Radiotherapy. Med Phys 2013. [DOI: 10.1118/1.4814921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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81
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Plant B, Konstan M, Aherns R, Rodriguez S, Munck A, Elborn J, Johnson C. 53 Lung function, weight, and sweat chloride responses in patients with cystic fibrosis and the G551D-CFTR mutation treated with ivacaftor: A secondary analysis. J Cyst Fibros 2013. [DOI: 10.1016/s1569-1993(13)60195-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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82
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Tejera B, Riveros A, Grados D, Martinez-Morillo M, Rodriguez S, Holgado S, Mateo L, Olivé A, Tena X. AB0512 Biological treatment of still’s disease. Report of seven pacients. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2012-eular.512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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83
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Perez-Regadera J, Gomez S, D'Ambrosi R, Rodriguez S, Gascon N, Colmenero M, Perez-Escutia M, Rodriguez V, Cascales A, Lanzos E. Impact of Value of Squamous Cell Carcinoma Antigen (SCC) in the Survival of Advanced Cervical Cancer, Managed With Chemoradiation Therapy (CT-RT). Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.1149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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84
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Rodriguez S, Gibiat V, Lefebvre A, Guilain S. Input impedance in flow ducts: theory and measurement. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2012; 132:1494-1501. [PMID: 22978878 DOI: 10.1121/1.4742717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
This paper presents both a theoretical and an experimental investigation of the influence of the mean flow on the input impedance of a duct. The input impedance of an axisymetrical flow duct is calculated, taking into account the convective effect of a uniform flow, the dissipative effect of a turbulent flow and the radiation in an open jet. Each of these effects is separately studied. An experimental apparatus has been specifically designed to lower flow noise on the transducers, taking advantage of the Two-Microphone-Three-Calibration (TMTC) method [V. Gibiat and F. Laloë, J. Acoust. Soc. Am. 88, 2533-2545 (1990)], whose full calibration process allows any geometry for the measurement head. Theory and experiments are compared for a 1 m long cylindrical duct carrying a flow whose Mach number equals up to 0.15. The resonant frequencies are in close agreement, within 3%. The relative evolution of the magnitude maxima with increasing flow are in good agreement, within 10%. Despite similar tendencies when modifying the mean flow velocity, the amplitude of variation of the magnitude is 2 to 5 times smaller in the experiments.
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Griese M, Ramsey B, Rodriguez S, Yen K, Elborn J. 44 Pulmonary exacerbations in a Phase 3 trial of ivacaftor in subjects with cystic fibrosis who have the G551D-CFTR mutation. J Cyst Fibros 2012. [DOI: 10.1016/s1569-1993(12)60213-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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86
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Gomez S, Perez-Regadera J, Gascón N, Rodriguez S, Bartolomé A, Cabeza M, Lanzós E. PO-0700 PROGNOSTIC VALUE OF SQUAMOUS CELL CARCINOMA ANTIGEN (SCC) IN CERVICAL CANCER MANAGED WITH CHEMO-RADIOTHERAPY. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)71033-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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87
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Depiaggio M, Santos M, Rodriguez S, Richart J, Perez-Calatayud J, Ballester F. PO-204 LDRBT IN LOW RISK PROSTATE ADENOCARCINOMA. 145 GY. VS 160 GY. LONG TERM RESULTS AND TOXICITY. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)72170-9] [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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88
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Komisopoulos G, Rodriguez S, Su F, Stathakis S, Shi C, Sakellaropoulos G, Nikoforidis G, Papanikolaou N, Mavroidis P. EP-1497 THE RISK OF SECONDARY MALIGNANCIES IN THE COMPARISON OF HELICAL TOMOTHERAPY, IMRT, AND CRT. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)71830-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Bensen DC, Rodriguez S, Nix J, Cunningham ML, Tari LW. Structure of MurA (UDP-N-acetylglucosamine enolpyruvyl transferase) from Vibrio fischeri in complex with substrate UDP-N-acetylglucosamine and the drug fosfomycin. Acta Crystallogr Sect F Struct Biol Cryst Commun 2012; 68:382-5. [PMID: 22505403 PMCID: PMC3325803 DOI: 10.1107/s1744309112006720] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2012] [Accepted: 02/14/2012] [Indexed: 11/10/2022]
Abstract
The development of new antibiotics is necessitated by the rapid development of resistance to current therapies. UDP-N-acetylglucosamine enolpyruvyl transferase (MurA), which catalyzes the first committed step of bacterial peptidoglycan biosynthesis, is a prime candidate for therapeutic intervention. MurA is the target of the antibiotic fosfomycin, a natural product produced by Streptomyces. Despite possessing a high degree of sequence conservation with MurA enzymes from fosfomycin-susceptible organisms, recent microbiological studies suggest that MurA from Vibrio fischeri (VfiMurA) may confer fosfomycin resistance via a mechanism that is not yet understood. The crystal structure of VfiMurA in a ternary complex with the substrate UDP-N-acetylglucosamine (UNAG) and fosfomycin has been solved to a resolution of 1.93 Å. Fosfomycin is known to inhibit MurA by covalently binding to a highly conserved cysteine in the active site of the enzyme. A comparison of the title structure with the structure of fosfomycin-susceptible Haemophilus influenzae MurA (PDB entry 2rl2) revealed strikingly similar conformations of the mobile substrate-binding loop and clear electron density for a fosfomycin-cysteine adduct. Based on these results, there are no distinguishing sequence/structural features in VfiMurA that would translate to a diminished sensitivity to fosfomycin. However, VfiMurA is a robust crystallizer and shares high sequence identity with many clinically relevant bacterial pathogens. Thus, it would serve as an ideal system for use in the structure-guided optimization of new antibacterial agents.
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Alexeeva E, Kozlova A, Valieva S, Bzarova T, Chomahizde A, Isaeva K, Denisova R, Slepcova T, Starkova A, Amirdzhanova V, Alexandrova E, Avdeeva A, Novikov A, Panasyuk E, Cherkasova M, Klimova N, Nasonov E, Aggarwal A, Sharma A, Bhatnagar A, Dubula T, Mody GM, Abdel-Wahab N, Tayseer Khedr S, Rashad E, Alkady E, Mosad, Owino L, Ubeer A, Pan Z, Liu X, Xu J, Zhang Y, Omurzakova NA, Volkava M, Kundzer A, Generalov I, Tan W, Wu H, Zhao J, Derber LA, Lee DM, Shadick NA, Conn DL, Smith EA, Gersuk VH, Nepom GT, Moreland LW, Furst DE, Thompson SD, Jonas BL, Michael Holers V, Glass DN, Chen PP, Louis Bridges S, Weinblatt ME, Paulus HE, Tsao BP, Umar S, Ahmad S, Kant Katiyar C, Khan HA, Munoz A, Martinez R, Rodriguez S, Luis Marenco J, Lu Z, Guo-chun W, Shah D, Bhatnagar A, Wanchu A, Sherif Suliman YA, Budhoo A, Mody GM, Hristova M, Kamenarska Z, Dourmishev L, Baleva M, Kaneva R, Savov A, Retamozo S, Diaz-Lagares C, Brito-Zeron P, Gomez ME, Bosch X, Bove A, Forns X, Yague J, Ramos-Casals M, Chen Z, Li XM, Wang GS, Qian L, Li XP, Zu N, Zhao H, Xu B, Li HY, Xiang Q, Wang GC, Mazur-Nicorici L, Mazur M, Crib L, Ding H, Chen S, Ye S, Fedorenko E, Lukina G, Sigidin Y, Hammam N, Orabi H, Lue TF, Goel R, Danda D, Eapen C, Mathew J, Kumar S. Abstracts from EIR School ES01-ES25. Rheumatology (Oxford) 2012. [DOI: 10.1093/rheumatology/ker439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Rodriguez S, Fadlalla K, Graham T, Tameru B, Fermin CD, Samuel T. Immunohistochemical evaluation of AKT protein activation in canine mast cell tumours. J Comp Pathol 2012; 147:171-6. [PMID: 22289273 DOI: 10.1016/j.jcpa.2011.12.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Revised: 10/28/2011] [Accepted: 12/02/2011] [Indexed: 02/04/2023]
Abstract
The pathogenesis of canine mast cell tumour (MCT) remains unknown. Moreover, therapeutic options are limited and resistance to targeted drugs and recurrences are common, necessitating the identification of additional cellular targets for therapy. In this study we investigated the expression of phosphorylated AKT protein in 25 archival canine MCT samples by immunohistochemistry and examined the correlation between the immunohistochemical scores and histopathological tumour grades. AKT protein was detected in all of the samples and 24 of the 25 samples expressed the phosphorylated form of the protein, albeit with variable intensity. However, when the immunohistochemical scores of weak, intermediate and strong labelling were compared with the histopathological grades I to III, there was no strong correlation. This study suggests that canine MCT cells have activated AKT and indicates the need for further research on the role of the AKT protein and the possibility of targeting the AKT signalling pathway in MCTs.
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Cao L, Rickenbacher GT, Rodriguez S, Moulia TW, Albers MW. The precision of axon targeting of mouse olfactory sensory neurons requires the BACE1 protease. Sci Rep 2012; 2:231. [PMID: 22355745 PMCID: PMC3262176 DOI: 10.1038/srep00231] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2011] [Accepted: 01/05/2012] [Indexed: 11/09/2022] Open
Abstract
The β-site amyloid precursor protein cleaving enzyme 1 (BACE1) is necessary to generate the Aβ peptide, which is implicated in Alzheimer's disease pathology. Studies show that the expression of BACE1 and its protease activity are tightly regulated, but the physiological function of BACE1 remains poorly understood. Recently, numerous axon guidance proteins were identified as potential substrates of BACE1. Here, we examined the consequences of loss of BACE1 function in a well-defined in vivo model system of axon guidance, mouse olfactory sensory neurons (OSNs). The BACE1 protein resides predominantly in proximal segment and the termini of OSN axons, and the expression of BACE1 inversely correlates with odor-evoked neural activity. The precision of targeting of OSN axons is disturbed in both BACE1 null and, surprisingly, in BACE1 heterozygous mice. We propose that BACE1 cleavage of axon guidance proteins is essential to maintain the connectivity of OSNs in vivo.
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Piña R, Gutiérrez AH, Gilman RH, Rueda D, Sifuentes C, Flores M, Sheen P, Rodriguez S, García HH, Zimic M. A dot-ELISA using a partially purified cathepsin-L-like protein fraction from Taenia solium cysticerci, for the diagnosis of human neurocysticercosis. ANNALS OF TROPICAL MEDICINE AND PARASITOLOGY 2011; 105:311-8. [PMID: 21871167 DOI: 10.1179/136485911x12987676649782] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Human neurocysticercosis (NCC), caused by the cestode Taenia solium, is responsible for a significant amount of neurological morbidity and epilepsy in developing countries. The disease remains highly endemic in many areas, despite several efforts and interventions to control it. A simple, cheap and fast diagnostic assay that is suitable for use in field conditions is highly desired. In immunodiagnostics based on western immunoblots or standard ELISA, a cathepsin-L-like protein purified from the cysticercus fluid has previously performed well as an antigen. In a recent study in Peru, the same 53/25-kDa antigen was therefore used in the development of a dot-ELISA that could be employed for mass screenings under field conditions. The assay was standardized and tested not only against sera from a large group of NCC cases but also against sera from patients with other common parasitic infections, so that sensitivity and specificity could be assessed. For NCC, the assay gave better sensitivity in the detection of individuals with extraparenchymal cysts (94·4%-100%) or multiple parenchymal cysts (74·6%-80·0%) than in the detection of individuals with single parenchymal cysts (29·4%-45·1%). The assay also showed a high specificity for NCC (99·0%-100%), with a very low level of cross-reactivity with other parasitic infections. The dot-ELISA developed in this study is a highly specific, simple, cheap and rapid test for NCC that could be used under field conditions, even in the low-resource settings that are common in developing countries.
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Daumas A, Bernard F, Forcioli M, Rodriguez S, Rossi P, Demoux AL, Bagneres D, Frances Y, Granel B. Une radiographie typique. Rev Med Interne 2011; 32:580-1. [DOI: 10.1016/j.revmed.2010.10.358] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2010] [Accepted: 10/20/2010] [Indexed: 11/25/2022]
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Moulin J, Marszalek A, Gayet V, Blanchet V, Streuli I, Lafay M, Pont JC, Chapron C, De Ziegler D, Moolenaar LM, Verhoeve HR, van der Veen F, Hompes P, Mol BWJ, Savasi V, Oneta M, Elli M, Parilla B, Loareti A, Cetin I, Shapiro BS, Daneshmand ST, Garner FC, Aguirre M, Hudson C, Thomas S, Simsek Y, Celik O, Yilmaz E, Karaer A, Koc O, Aydin NE, Rodriguez S, Agudo D, Pacheco A, Garcia-Cerrudo E, Schneider J, Garcia-Velasco JA. SELECTED ORAL COMMUNICATION SESSION, SESSION 35: ENDOMETRIOSIS, Tuesday 5 July 2011 10:00 - 11:30. Hum Reprod 2011. [DOI: 10.1093/humrep/26.s1.35] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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96
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Richart J, Pujades MC, Perez-Calatayud J, Granero D, Ballester F, Rodriguez S, Santos M. QA of dynamic MLC based on EPID portal dosimetry. Phys Med 2011; 28:262-8. [PMID: 21784685 DOI: 10.1016/j.ejmp.2011.06.046] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2010] [Revised: 06/24/2011] [Accepted: 06/28/2011] [Indexed: 10/18/2022] Open
Abstract
PURPOSE Dynamic delivery of intensity modulated beams (dIMRT) requires not only accurate verification of leaf positioning but also a control on the speed of motion. The latter is a parameter that has a major impact on the dose delivered to the patient. Time consumed in quality assurance (QA) procedures is an issue of relevance in any radiotherapy department. Electronic portal imaging dosimetry (EPID) can be very efficient for routine tests. The purpose of this work is to investigate the ability of our EPID for detecting small errors in leaf positioning, and to present our daily QA procedures for dIMRT based on EPID. METHODS AND MATERIALS A Varian 2100 CD Clinac equipped with an 80 leaf Millennium MLC and with amorphous silicon based EPID (aS500, Varian) is used. The daily QA program consists in performing: Stability check of the EPID signal, Garden fence test, Sweeping slit test, and Leaf speed test. RESULTS AND DISCUSSION The EPID system exhibits good long term reproducibility. The mean portal dose at the centre of a 10 × 10 cm(2) static field was 1.002 ± 0.004 (range 1.013-0.995) for the period evaluated of 47 weeks. Garden fence test shows that leaf position errors of up to 0.2 mm can be detected. With the Sweeping slit test we are able to detect small deviations on the gap width and errors of individual leaves of 0.5 and 0.2 mm. With the Leaf speed test problems due to motor fatigue or friction between leaves can be detected. CONCLUSIONS This set of tests takes no longer than 5 min in the linac treatment room. With EPID dosimetry, a consistent daily QA program can be applied, giving complete information about positioning/speed MLC.
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Alvarez J, Bezos J, de Juan L, Vordermeier M, Rodriguez S, Fernandez-de-Mera IG, Mateos A, Domínguez L. Diagnosis of Tuberculosis in Camelids: Old Problems, Current Solutions and Future Challenges. Transbound Emerg Dis 2011; 59:1-10. [DOI: 10.1111/j.1865-1682.2011.01233.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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98
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Perez-Calatayud J, Meseguer VC, Lliso-Valverde F, Pujades M, Camacho C, Ballester F, Tormo A, Rodriguez S, Roldan S, Santos M, Antonini P, Richart J, Granero D. SU-E-T-586: Utrecht Applicator Reconstruction in MRI-Based Cervix Gynaecological Brachytherapy. Med Phys 2011. [DOI: 10.1118/1.3612548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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99
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Rodriguez S, Gibiat V, Lefebvre A, Guilain S. The three-measurement two-calibration method for measuring the transfer matrix. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2011; 129:3056-3067. [PMID: 21568409 DOI: 10.1121/1.3557058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Extensive use of transfer matrices (TMs) is made in determining the acoustic properties of a duct and in in-duct acoustic propagation models in the automotive industry and for musical acoustics purposes. The experimental apparatuses of classical TM measurement methods feature two measurement heads. Two microphones are flush with the walls of each head. The pressure signals are processed following the transfer function method constructed on an analytical model of acoustic propagation in measurement heads. The present paper aims at presenting a measurement method based on a three-microphone experimental apparatus and on its acoustic calibration through two reference measurements: the three-measurement two-calibration method for measuring the TM (3M2C-TM). Two microphones are flush with the measurement head walls and one is in the cap closing one side of the measured duct. 3M2C-TM proved essential for an accurate measurement of the four TM elements of two different ducts: a cylindrical duct and an expansion chamber.
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Munoz A, Martinez R, Leon M, Gallo F, Velloso ML, Rodriguez S, Mayordomo L, Rejon E, Marenco JL. Interstitial lung disease in patients with scleroderma: treatment with rituximab. Ann Rheum Dis 2011. [DOI: 10.1136/ard.2010.149013.25] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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