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Search Results: 1 - 10 of 684071 matches for " S.J. Pérez Ruíz "
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Optical sensing technique for Young's modulus measurements in piezoelectric materials
Pérez Ruíz, S.J;Montero Díaz, J.A;Alcántara Iniesta, S;Hernández, P.R;Casta?eda G, R;
Revista mexicana de física , 2008,
Abstract: in the design of microsensors using microelectromechanical system (mems) technology, it is necessary to know the elastic properties of the materials employed in their fabrication. reliable mechanical properties of the materials are critical to the safety and correct functioning of these microdevices. mechanical testing of microstructures that are only a few microns thick requires novel techniques and specialized procedures for preparation and handling. in this paper a simplified optic sensing is used to measure the young's modulus in piezoelectric cantilever. this optical technique was chosen because it is the most appropriate when working with small devices, besides being easily implemented and low cost.
Sound speed resolved by photoacoustic technique
Pérez Ruíz, S.J.;Alcántara Iniesta, S;Hernández, P.R.;Casta?eda-Guzmán, R;
Revista mexicana de física , 2007,
Abstract: in this work a new method for measuring the speed of sound in materials is reported. this method uses the photoacoustic effect, which is the generation of sound waves by pulsed optical radiation incident on a material sample. the sound waves generated on the surface of the sample travel through the material and are detected with two piezoelectric sensors separated by a known distance. an appropriate processing of the photoacoustic signal permits the separation of the information of the generated longitudinal waves, of their reflections, as well as of other types of waves generated (shear, surface, etc). the advantages and disadvantages, of this method are discussed in comparison with standard methods.
Sound speed resolved by photoacoustic technique
S.J. Pérez Ruíz,S. Alcántara Iniesta,P.R. Hernández,R. Casta?eda-Guzmán
Revista mexicana de física , 2007,
Abstract: En el presente trabajo se reporta una técnica novedosa para medir la velocidad del sonido en materiales. Este método de medición utiliza el efecto fotoacústico, que consiste en irradiar una muestra de material con pulsos cortos de radiación láser, registrando la onda acústica generada con dos sensores piezoeléctricos separados por una distancia conocida. Un procesamiento adecuado de la se al fotoacústica permite separar la información de las ondas longitudinales generadas, de sus reflexiones, así como de los frentes de onda de otro tipo de ondas generadas (cortantes, de superficie, etc.). Se discuten sus ventajas y desventajas frente a los métodos usuales.
Fuente sonora omni-direccional
Pérez López, A.;Palacios González, E.;Pérez Ruiz, S.J.;
Revista mexicana de física , 2006,
Abstract: the design, construction and evaluation of an omni-directional sound source is presented. it was developed in our laboratory for acoustic applications. the evaluation shows that its characteristics fulfill the requirements demanded by international standards.
Revisión sistemática sobre el efecto analgésico de la crioterapia en el manejo del dolor de origen músculo esquelético
Gutiérrez Espinoza,H.J.; Lavado Bustamante,I.P.; Méndez Pérez,S.J.;
Revista de la Sociedad Espa?ola del Dolor , 2010,
Abstract: introduction: cryotherapy is an alternative to superficial thermotherapy based on the application of cold as a therapeutic agent, although it is quite clear it is widely used for pain relief. however, only relies on indirect mechanisms of action and without a scientific basis to support its clinical application. based on this an analysis will be made of the evidence regarding the effectiveness of cryotherapy by means of a systematic review of randomized controlled trials. objective: to determine if there is scientific evidence to endorse the analgesic effect of cryotherapy for the management of musculoskeletal pain. strategy of search: the words/phrases included in the search were, randomized controlled trials (rcts), systematic reviews (sr) and metaanalysis (mt), the databases used were: medline/pubmed, pubmed central, sciencedirect, biomed central, cochrane library plus and dare. results: we selected a total of eight studies, including randomized controlled trials and systematic reviews. conclusions: there is moderate evidence supporting that the use of cryotherapy reduces pain and improves recovery times in ankle sprain and soft tissue injuries associated with sport, but there is limited evidence for its use in knee osteoarthritis, rheumatoid arthritis and low back pain syndrome.
Revisión sistemática sobre el efecto analgésico de la crioterapia en el manejo del dolor de origen músculo esquelético Systematic review of the analgesic effect of cryotherapy in the management of musculoskeletal pain
H.J. Gutiérrez Espinoza,I.P. Lavado Bustamante,S.J. Méndez Pérez
Revista de la Sociedad Espa?ola del Dolor , 2010,
Abstract: Introducción: La Crioterapia es una modalidad de Termoterapia Superficial que se basa en la aplicación del frío como agente terapéutico, si bien es cierto, es ampliamente utilizada para el alivio del dolor, su indicación clinica tradicionalmente se ha sustentado en mecanismos de acción indirectos, sin una base científica o estudios clínicos que avalen su efectividad, se realizará una síntesis de la evidencia relativa a la efectividad de la crioterapia a través de una revisión sistemática de ensayos clínicos aleatorizados. Objetivo: Determinar si existe evidencia científica que avale el efecto analgésico de la crioterapia para el manejo del dolor de origen musculoesquelético. Estrategia de búsqueda: Se incluyeron en la búsqueda Ensayos Clínicos Aleatorizados (ECA), Revisiones Sistemáticas (RS) y Metaanálisis (MT), las bases de datos usadas fueron: MEDLINE, ScienceDirect, Biomed Central, Cochrane y DARE. Resultados: Se seleccionaron un total de ocho estudios, incluyendo ensayos clínicos aleatorizados y revisiones sistemáticas. Conclusiones: Existe moderada evidencia que el uso de la crioterapia disminuye el dolor y mejora los tiempos de recuperación en esguince de tobillo y en lesiones de tejidos blandos asociados al deporte, la evidencia es limitada para el uso en Osteoartritis de rodilla, Artritis Reumatoide y Síndrome de Dolor Lumbar. Introduction: Cryotherapy is an alternative to Superficial Thermotherapy based on the application of cold as a therapeutic agent, although it is quite clear it is widely used for pain relief. However, only relies on indirect mechanisms of action and without a scientific basis to support its clinical application. Based on this an analysis will be made of the evidence regarding the effectiveness of Cryotherapy by means of a Systematic Review of Randomized Controlled Trials. Objective: To determine if there is scientific evidence to endorse the analgesic effect of Cryotherapy for the management of Musculoskeletal Pain. Strategy of Search: The words/phrases included in the search were, Randomized Controlled Trials (RCTs), Systematic Reviews (SR) and Metaanalysis (MT), the databases used were: MEDLINE/PubMed, PubMed Central, ScienceDirect, Biomed Central, Cochrane Library Plus and DARE. Results: We selected a total of eight studies, including Randomized Controlled Trials and Systematic Reviews. Conclusions: There is moderate evidence supporting that the use of Cryotherapy reduces pain and improves recovery times in ankle sprain and soft tissue injuries associated with sport, but there is limited evidence for its use in Knee Os
Hemangioma cavernoso multifocal en cráneo: Revisión de un caso
Vega,A.; Obieta,E. De; Aguado,G.; Esqueda,M.; Ruíz,S.; Ramirez,E.; Pérez,J.;
Neurocirugía , 2010, DOI: 10.4321/S1130-14732010000600006
Abstract: a 39 year old female presented with a multifocal lesions in the skull, at the frontal right and parietal left. we performed bilateral craniectomies guided with navigation, and the bone defects were repaired with titanium mesh. the pathological examination reported intraosseous cavernous hemangioma in both lesions. follow up of six months without any complication or recurrence and good cosmetic outcome.
Enfermedad de Whipple: una infrecuente causa bacteriana de demencia.
Manuel J Hens Pérez,Jesús Foronda Bengoa,Juan Montes Ruíz-Cabello,Inmaculada Nieto Gutiérrez
Revista de la Asociación Espa?ola de Neuropsiquiatría , 2009,
Abstract: Presentamos un caso de demencia diagnosticada como Alzheimer, cuya evolución condujo al diagnóstico final de una enfermedad de Whipple cerebral.
The effect of pre-slaughter stress resulting from feed withdrawal on meat quality characteristics in ostriches
S.J. Van Schalkwyk, S.W.P. Cloete, L.C. Hoffman, Z. Brand, A.P. Pfister, K. Punt
South African Journal of Animal Science , 2000,
Abstract: (South African J of Animal Science, 2000, 30, Supplement 1: 147-148)
Análisis del síndrome de vejiga hiperactiva y de la incontinencia urinaria en varones en la franja de edad de los 50 a los 65 a?os: Estudio EPICC
Martínez-Agulló,E.; Ruíz Cerda,J.L.; Arlandis Guzmán,S.; Rebollo,P.; Pérez,M.; Chaves,J.; ,;
Actas Urológicas Espa?olas , 2010, DOI: 10.4321/S0210-48062010000600009
Abstract: introduction: the overactive bladder syndrome (oab) and urinary incontinence (ui) result in an important personal and economic impact. this work concentrates on the detailed analysis of oab and ui (derived symptoms and tendencies in medical consultation and resource consumption), in a sample of working men aged 50-65. material and methods: this study is within the framework of the epicc study of the spanish association of urology (epidemiologic, observational, multicentric, national study) and concentrates on the detailed analysis of the characteristics of the sample of working men aged 50-65 (n=1071) and of the subgroup of individuals with vh and/or iu (n=55). results: 0.56% of the subjects presented ui, 3.55% oab, 1.03% presented both pathologies. taking into account those individuals with ui and/or oab, 45.45% had problems to retain urine, and 16.36% suffered leakage daily; 45.45% suffered uncontrollable urge to urinate daily; 23.64% had never sought medical advice, 65.45% had visited an urologist, 14.55% would like to visit an specialist in incontinence; 40% had received treatment, from which 81.82 had received pharmacologic treatment. conclusion: in this study, specific data about vh and iu in the reported sample are presented, including those referring to the magnitude of these conditions and use of sanitary resources in subjects with ui and/or oab, aiming at contributing to a better diagnose and handling of patients and resources.
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