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Search Results: 1 - 10 of 550177 matches for " S.J.;Alcántara Iniesta "
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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.
Optical sensing technique for Young s modulus measurements in piezoelectric materials
S. J. Pérez Ruiz,J.A. Montero Díaz,S. Alcántara Iniesta,P. R. Hernández
Revista mexicana de física , 2008,
Abstract: En el dise no de micro sensores utilizando la tecnolog′ a de sistemas micro electromec′anicos (MEMS por sus siglas en ingl′es), es necesario conocer las propiedades mec′anicas de los materiales empleados. Las propiedades mec′anicas fidedignas son cr′ ticas para el funcionamiento correcto y seguro de estos micro dispositivos. Someter a prueba a micro estructuras cuyo grosor es de una cuantas micras requiere t′ecnicas nuevas y procedimientos especializados para su preparaci′on y manejo. En este trabajo se utiliza un sensado ′optico simplificado para medir el m′odulo de Young en trampolines piezoel′ectricos. Esta t′ecnica ′optica se eligi′o debido a que es la mas apropiada cuando se trabaja con dispositivos peque nos; adem′as es f′acil de instrumentar y de bajo costo
No culture shock? Addressing the Achilles heel of modern Bible translations
S.J. Joubert
Acta Theologica , 2002,
Abstract: Modern Bible translations are often more sensitive to the needs of their intended readers than to the right of biblical texts to be heard on their own terms as religious artefacts from the ancient Mediterranean world. Since all biblical documents linguistically embody socio-religious meanings derived from ancient Mediterranean societies, they also need to be experienced as different, even alien, by modern readers. Without an initial culture shock in encountering a Bible translation modern people are held prisoners by Western translations of the Bible. Therefore, translations should instil a new sensitivity among modern readers to the socio-cultural distance between them and the original contexts of the Bible. In order to help facilitate this historical awareness, a new generation of "value added" translations must, in creative and responsible ways, begin to provide a minimum amount of cultural information to assist modern readers in assigning legitimate meanings to the linguistic signs encapsulated on the pages of the Bible. (Acta Theologica, Supplementum 2, 2002: 30-43)
Keynote Address - Reproductive health: global infertility trend
S.J Etuk
Nigerian Journal of Physiological Sciences , 2009,
Abstract: No
Continuous Hybrid Methods for Direct Solution of General Second Order Differential Equations
S.J. Kayode
Research Journal of Applied Sciences , 2012,
Abstract: In this study, a two-step zero stable hybrid Numerov type method is developed for direct solution of general ordinary differential equations of the form The method based on predictor-corrector approach, is consistent and zero-stable. Efforts are made to develop a predictor having the same order as that of the corrector, thereby reducing the consequential effects of the predictor on the accuracy of the method. The accuracy of the method is tested with linear and non-linear problems.
A survey on the knowledge of health system personel in Ghom province toward oral and dental health
Poorhashemi S.J
Journal of Dental Medicine , 2004,
Abstract: Statement of Problem: The accomplishment of oral and dental health is one of the most important goals in preventive dentistry influenced by the people’s knowledge and attitudes. Health system personel are the group able to play the most important role in this field affecting the society under their control directly. Purpose: The aim of this study was to evaluate the knowledge of health system personel, working in Ghom province, about oral and dental health. Materials and Methods: In this descriptive cross-sectional study, knowledge and attitudes of all 187 personel working in the health system center of Ghom province were investigated through a questionnaire including 10 questions on knowledge and 10 other ones on the attitudes of subjects studied. Data were subjected to ANOVA, Tukey and correlation tests. Results: The knowledge of females was higher, compared to males showing a statistically significant difference (P<0.05). There was a positive correlation between subjects’ knowledge and their level of education, age and work duration (P<0.05). Conclusion: Generally, the level of knowledge and attitude of the personel working in health centers in Ghom province was acceptable but not an ideal one and the continuity of training and re-education courses seemed necessary.
Naar aanleiding van I La Galigo
S.J. Esser
Bijdragen tot de Taal-, Land- en Volkenkunde , 1961,
Abstract:
Die opvoedingstaak van die universiteit
S.J. Preller
Koers : Bulletin for Christian Scholarship , 1970, DOI: 10.4102/koers.v37i5.1338
Abstract: Die vraag na die opvoedingstaak van die universiteit is onafskeidelik verbonde aan die siening wat gehuldig word aangaande die opvoeding, die student en die universiteit. Dit is derhalwe nodig om vooraf hierdie begrippe in o nskou te neem. Met inagneming van die beskikbare tyd daartoe, sal die drie begrippe slegs kursories en in so ’n mate ontleed word as wat nodig is om die sentrale tema te belig.
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