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Search Results: 1 - 10 of 10731 matches for " Adriana Salas Zamarripa "
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Mathematical Modeling of a Transient Vibration Control Strategy Using a Switchable Mass Stiffness Compound System
Diego Francisco Ledezma-Ramirez,Neil Ferguson,Adriana Salas Zamarripa
Shock and Vibration , 2014, DOI: 10.1155/2014/565181
Abstract: A theoretical control strategy for residual vibration control resulting from a shock pulse is studied. The semiactive control strategy is applied in a piecewise linear compound model and involves an on-off logic to connect and disconnect a secondary mass stiffness system from the primary isolation device, with the aim of providing high energy dissipation for lightly damped systems. The compound model is characterized by an energy dissipation mechanism due to the inelastic collision between the two masses and then viscous damping is introduced and its effects are analyzed. The objective of the simulations is to evaluate the transient vibration response in comparison to the results for a passive viscously damped single degree-of-freedom system considered as the benchmark or reference case. Similarly the decay in the compound system is associated with an equivalent decay rate or logarithmic decrement for direct comparison. It is found how the compound system provides improved isolation compared to the passive system, and the damping mechanisms are explained. 1. Introduction Mechanical shock is a common problem characterized by a suddenly applied excitation in a short period of time. Usually it involves very large forces and displacements which could lead to damage to sensitive equipment, human discomfort, and other effects [1]. Thus the effective isolation of shock generated vibration is a very important matter in engineering. Shock isolation is normally achieved through energy storage by elastic foundations but optimum isolation is compromised due to the high energy levels requiring large deformations of the isolator where normally space is a constraint. Additionally the isolation system must be able to dissipate the stored energy quickly once the shock has finished in order to minimize residual vibrations. The classical approach to shock isolation is based on a single degree-of-freedom system with linear stiffness and viscous damping elements. Many shock scenarios can be analyzed considering this method to select proper isolators. Most of the literature related to shock isolation dates from 1950 to 1960 when authors like Ayre [2], Snowdon [3], and Eshleman and Rao [4] studied this phenomenon and settled the fundamental theory of shock analysis and isolation. However, linear passive elements are limited. For instance, there is the compromise aforementioned between isolation performance and space limitations. In order to improve shock isolation, the use of variable or switchable rate elements has been considered. Optimal shock isolation has been considered
Miradas encontradas: funcionarios reales, curas e indígenas en Yucatán durante el periodo colonial
Adriana Rocher Salas
Fronteras de la Historia , 2010,
Abstract: El presente texto estudia las diversas formas en que funcionarios civiles y eclesiásticos miraron a los indígenas de Yucatán durante el período colonial. La imagen que de los mayas construyeron quienes los gobernaron nos dará una visión más amplia de los diferentes esquemas impuestos para su gobierno espiritual y temporal y el carácter de la relación espa oles-mayas yucatecos. Con este fin, como hilo conductor se tendrán los juicios construidos sobre la vida indígena respecto a tres aspectos considerados esenciales: su vida en -policía y civilidad cristiana-, su fidelidad a Dios y al rey y sus características y capacidades como personas.
Frailes y clérigos en Yucatán. Siglo XVII
Rocher Salas, Adriana
Hispania Sacra : Revista de Historia Eclesiástica , 2003,
Abstract: From 1601 until almost the end of the seventeenth century, the diocese of Yucatán were immersed in a long litigation by 10 rural curates, which involved both Franciscans and secular clerics. The importance of controlling the numerous indigenous population, meant that an ecclesiastical problem merited the intervention of practically all the social sectors of Yucatan, and of course, the Spanish Crown. It is for this reason that the analysis of this event permits the appreciation of how such diverse elements as royal ecclesiastical politics, the evangelization and the interests of different local groups, can converge. Desde 1601 hasta casi finalizar el siglo XVII, la diócesis de Yucatán se vio inmersa en un largo litigio por 10 curatos de indios, que involucró a franciscanos y clérigos seculares. La importancia de controlar a la numerosa población indígena hizo que un problema entre eclesiásticos ameritase la intervención de prácticamente todos los sectores que componían la sociedad yucateca y, por supuesto, de la Corona espa ola. Es por eso que su estudio permite apreciar cómo convergían y se entrelazaban elementos tan diversos como la política eclesiástica regia, la cura de almas y los intereses de los distintos grupos locales.
Clerecía y sociedad en Campeche durante el periodo colonial
Adriana Rocher Salas
Tzintzun. Revista de Estudios Históricos , 2005,
Abstract: Este trabajo analiza los vínculos entre el clero secular y la sociedad en el Campeche colonial. La inserción de la Iglesia en el mundo americano no se restringió al ámbito puramente espiritual, sino que las condiciones creadas por la evangelización afianzaron la comunión de intereses entre la Iglesia y Estado. En este contexto el clero diocesano tenía la obligación de mantener a su feligresía fiel a los dictados de su Iglesia y de su Rey, pero también necesitaba contar con un capital social que hiciera frente al prestigio de las órdenes religiosas - protagonistas del proceso evangelizador, de la actividad hospitalaria y de la educación-. La política imperial otorgó mayor influencia al clero diocesano en la definición de espacios de autoridad, pues incrementó su presencia en áreas tradicionalmente ocupadas por las órdenes religiosas. Estos sacerdotes seculares serían los encargados de preservar para la Iglesia su antigua condición de dominio
Religiosidad e identidad en San Francisco de Campeche. Siglos XVI y XVII
Rocher Salas, Adriana Delfina
Anuario de Estudios Americanos , 2006,
Abstract: This study examines the problems concomitant to the development of a common identity among the Spanish settlers of San Francisco de Campeche during the Colonial period, with focus on the role played by religious elements in the shaping of this identity – in particular, the cult to the saints. An analysis of factors such as the characteristics of the saints in the neighborhood and local associations; processes of cult adoption, adaptation or dismissal; as well as the participation of the different local sectors in promoting the to their respective saints will be presented. This analysis will take into consideration the conflictive relationship between Spanish settlers and native people in Yucatán, a situation that prevented the using of aboriginal cultural elements in the shaping of a new identity Este trabajo estudia los problemas que acompa aron la gestación de una identidad propia y común para los residentes hispanos de la villa y puerto de San Francisco de Campeche durante el período colonial y la participación de elementos religiosos, particularmente el culto a los santos patronos, en el proceso. Teniendo como telón de fondo la peculiaridad de la región yucateca, donde una conflictiva relación entre espa oles e indígenas impidió la utilización de elementos culturales prehispánicos en la formación de una conciencia identitaria, se analizan diversos factores, como las características de los santos tutelares de los barrios y de algunas corporaciones locales, los procesos de adopción, adaptación u olvido de sus cultos por parte del vecindario porte o y la participación de los diferentes sectores locales en la promoción de sus santos patronos.
Validation of Total Daily Energy Expenditure Calculated with Actiheart against Doubly Labeled Water Method in Costa Rican Schoolchildren  [PDF]
Juan Diego Zamora-Salas, Adriana Laclé-Murray
Food and Nutrition Sciences (FNS) , 2015, DOI: 10.4236/fns.2015.613125
Abstract: The purpose of this study was to use the measurement of the PAEE taken from Actiheart in order to calculate the TEE in Costa Rican schoolchildren, and at the same time, to determine the effectiveness when it is compared against the TEE obtained by the DLW. A total of sixteen male schoolchildren were measured for their total daily energy expenditure (TEE) with the doubly labeled water (DLW) technique. The TEE obtained by the Actiheart monitor was calculated and validated against the DWL. The TEE was obtained adding the physical activity energy expenditure given by the Actiheart, plus the basal metabolic rate, and the energy cost of growth. The Pearson’s product‐moment correlation coefficient and the paired t‐test sample were measured in order to identify the association of the data and to evidence the differences between both measurements of TEE respectively. The Lin’s concordance correlation coefficient and the Bland-Altman plot evaluated the concordance of both methods. The correlation between the TEE obtained by DLW and the one calculated by Actiheart was r = 0.97, P < 0.001. The paired t-test showed no significant differences between both methods. Lin’s concordance correlation coefficient was Cb = 0.99, classified as almost perfect. The study validated the TEE calculated with Actiheart against the TEE measured by the DLW.
Violencia y tráfico de mujeres en México: una perspectiva de género
Acharya, Arun Kumar;Stevanato, Adriana Salas;
Revista Estudos Feministas , 2005, DOI: 10.1590/S0104-026X2005000300003
Abstract: today, gender-based violence has crossed all social barriers, with millions of women considering it a fact of life. among all kinds of gender-based violence, the trafficking of women is perhaps the most important, for women are sold in the sex market for the purpose of sexual exploitation. evidence shows that at present gender-based violence causes more deaths than diseases and accidents. the main objective of this study is to show that the trafficking of women remains as a form of sexual exploitation and violence against women in mexico. the data has been obtained in tapachula, a town in the state of chiapas, mexico.
Algunas consideraciones teóricas acerca del tráfico de mujeres en el contexto de la globalización
Kumar Acharya,Arun; Salas Stevanato,Adriana;
Revista de Ciencias Sociales , 2008,
Abstract: the objective of this paper is to describe some theoretical aspects related to the migration, trafficking and smuggling of people, particularly women. the study intends to explain the connections and disconnections among these social phenomena. trafficking as well as smuggling forms a part of migratory processes, which may occur with or without the immigrant?s consent. when it occurs without a person?s consent or through coercion it is called immigrant trafficking; on the other hand, when the movement occurs with the complete consent of an individual in order to enter a country illegally, it is called smuggling. the main purpose behind both of these activities is the same: the commerce of sex workers, the exploitation of people who are forced to perform work under conditions of slavery, among other activities, a situation which, to a certain point is the same in the case of the migration phenomenon when it occurs with or without a person?s consent.
Preferencia por hijos varones y escasez de mujeres en India
Arun Kumar Acharya,Adriana Salas Stevanato
Papeles de población , 2006,
Abstract: El objetivo del presente trabajo es abordar algunos de los principales aspectos que han provocado un desequilibrio en el índice del sexo femenino en la India debido a la preferencia de género, pues según datos del censo de 2001 hay un déficit de 35 millones de mujeres en comparación con el número total de hombres. Para constatar dicha preferencia se han considerado los índices de la tasa de natalidad y mortalidad, así como los aspectos socioculturales que contribuyen y agravan la situación de desventaja que ocupa la mujer históricamente dentro de la sociedad india.
Mortalidad por causas accidentales en ni?os menores de 5 a?os en el Hospital Nacional de Ni?os "Dr. Carlos Sáenz Herrera", 2002-2004
Benavides-Lara,Adriana; Vargas-Salas,Marco;
Acta Médica Costarricense , 2008,
Abstract: in costa rica unintentional injuries are the second cause of mortality in children under 5 years of age, with a ratio of 9.23 per 100000 inhabitants for the year 2004. hey are also the leading cause of loss of productive life years (337%)) for this age group. the objetive of this study was to determine the impact of this kind of injuries over the mortality of children under 5 years of age seen t the hospital nacional de ni?os (hnn) and to characterize this population. methods: we performed a case-ccontrol study pooling data on chilren aged 0-5 years who had been discharged from hnn with the diagnosis of unintentional injury from december 2001 to december 2004. all children who died from these injuries during this period constituded the cases and for each one we choose a control with the same age, sex and diagnosis discharged alive for this cause. results: there were 36 cases (ddeaths from unintentional injuries) 50% of each sex. motor vehicle related injuries and drownings were the leading causes of death. most of them were from san josé. there was no statatistical difference betwen cases and the controls in the mayority of variables. most of the deaths were during the summer and vacational months, beside 35% of them ocurred on weekends. most of the cases were admitted during the second shift (2pm-10pm) moreover the mayority of injuries (64%) took place at home (p<0.05). no supervision of children resulted to be risk factor for an unintentional injury ocurrence (p<0.05), but not for mortality. conclusion: the injury registry in costa rica is still very deficient,which makes difficult to carry out analitycal sutdies of prevalence of risk factors of unintentional injuries.
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