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Transmission function of the collinear acousto-optical filter controlled by acoustic waves of the finite amplitude

ALEXANDER SHCHERBAKOV Adán Omar Arellanes Bernabe (2013)

An opportunity to exploit specific mechanisms of the acousto-optic nonlinearity to regulate performances of the collinear acousto-optical filter, realizing the sequential spectrum analysis of optical signals, is considered. This possibility is theoretically analyzed and experimentally confirmed with an advanced filter based on calcium molybdate (CaMoO4) single-crystal with a 15-μs time-aperture. It is able to operate over red and near-infrared light at relatively low radio-wave frequencies providing almost lossless regime for controlling acoustic waves of the finite amplitude. Under certain conditions, the transmission function of electronically tunable filter exhibits a marked dependence on the applied acoustic power density, and as a result, one can significantly squeeze the transmission function, i.e., improve the spectral resolution of this filter at the cost of decreasing the efficiency of the device partially. The identified and observed non-linear effect makes possible varying the performance data of similar advanced collinear acousto-optical filter governed by external signals of the finite amplitude. © 2013 Society of Photo-Optical Instrumentation Engineers (SPIE) [DOI: 10.1117/1.OE.52.6.064001]

Article

Collinear acousto-optical interaction Optical filter Acousto-optical nonlinearity Transmission function Spectral resolution Waves of the finite amplitude CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA FÍSICA ÓPTICA ÓPTICA

Una visión desde la red de teorías TAC-EOS sobre el papel de las conexiones matemáticas en la comprensión de la derivada.

FLOR MONSERRAT RODRIGUEZ VASQUEZ ARMANDO MORALES CARBALLO (2021)

The question is answered: Given the algebraic expression of g, what connections ensure the student an understanding of g' that allows him to sketch the graph of g and explain its relationship with that of g'? To do this, interviews and a

task were applied to a group of students, in which they had to sketch the graph of g and explain its relationship with that of the derivative, and their mathematical activity was analyzed using the ETC-OSA articulation as a theoretical reference.

Article

understanding Extended Theory of Connections Onto-semiotic Approach Derivative Graph HUMANIDADES Y CIENCIAS DE LA CONDUCTA PEDAGOGÍA TEORÍA Y MÉTODOS EDUCATIVOS

Producción periodística de Juan Bautista Morales en la primera mitad del siglo XIX (1822-1856)

Journalist production of Juan Bautista Morales in the first half of the xix century (1822-1856).

FELIX HERNANDEZ (2022)

Este artículo analiza algunos periódicos que Juan Bautista Morales editó y publicó en la primera mitad del siglo XIX en México, y tiene el propósito de ofrecer al lector una gama de contenidos posible de profundizar para el estudio crítico del periodismo local, regional y nacional. El político guanajuatense expresó su pensamiento a través de estas publicaciones desde diversos contextos, inmerso en ese México decimonónico en que participó de forma activa y creativa.

This article analyzes some newspapers that Juan Bautista Morales edited and published in the first half of the 19th century in Mexico and aims to offer the reader a range of contents possible to deepen for the critical study of local, regional and national journalism. The Guanajuatense politician expressed his thoughts through these publications from various contexts, immersed in that nineteenth century Mexico in which he participated actively and creatively.

Article

HUMANIDADES Y CIENCIAS DE LA CONDUCTA Juan Bautista Morales, 1788-1856 Periodismo Crítica política Suprema Corte de Justicia de la Nación Juan Bautista Morales, 1788-1856 Guanajuato Journalism Political criticism Supreme Court of Justice of the Nation Guanajuato

Viaje trasandino y memorias de migración: imaginarios geográficos del Cono Sur en El sistema del tacto de Alejandra Costamagna

Trans-Andean journey and memories of migration: Southern Cone’s geographic imaginarium in Alejandra Costamagna’s El sistema del tacto.

MARIA TERESA JOHANSSON (2019)

Este artículo interpreta los vínculos entre espacio y memoria en la novela El sistema del tacto (2018) de Alejandra Costamagna a partir de la configuración de una geografía afectiva del Cono Sur, un imaginario de provincia argentina y un archivo familiar de la migración. La emergencia de un imaginario territorial que incluye el cruce transadino, el recorrido por la pampa y la ciudad provinciana de Campana proyecta distintas formas de vida social transformadas en el tiempo. Estos imaginarios se elaboran tanto desde una figura de infancia que despliega una percepción particular del paisaje natural como desde una subjetividad que en el presente narrativo retorna para constatar la caducidad de las formas de vivir y habitar del siglo xx. La novela integra aspectos espaciales, materiales y lingüísticos en la conformación de distintas experiencias, imágenes y percepciones del entorno.

This article interprets the relations between space and memory in the novel El sistema del tacto (2018) by Alejandra Costamagna based on the configuration of an affective geography of the Southern Cone, an imaginary of the Argentine province and a family archive of migration.

The emergence of a territorial imaginary that includes the andean crossing, the journey through the pampa and the provincial city of Campana project different forms of social life transformed in time. These imaginaries are elaborated both from a childhood figure that displays a particular perception of the natural landscape and from a subjectivity that in the present narrative returns to verify the expiration of the ways of living and inhabiting the 20th century. The novel integrates spatial, material and linguistic aspects in the conformation of different experiences, images and perceptions of the environment.

Article

HUMANIDADES Y CIENCIAS DE LA CONDUCTA Geografía del Cono Sur Provincia argentina Espacio Caducidad Memoria Geography of the Southern Cone Province Space Expiration Memory

La reescritura de la historia: la administración central lasallista como una vía para estudiar el período posconciliar, 1966-1989

The rewriting of history: the Lasallian central administration as a way to study the post-conciliar period, 1966-1989

LARISA GONZALEZ MARTINEZ (2020)

El presente artículo parte de una investigación histórica que se centra en el estudio de los Hermanos de La Salle. El objetivo es proponer la revisión de la documentación elaborada por la administración central lasallista en Roma, entre 1966 y 1989, como una vía para la comprensión y la escritura del pasado posconciliar lasallista, un caso que, a su vez, proporciona luz sobre la situación de las órdenes religiosas educadoras en el siglo xx. Así pues, para el cumplimiento de este propósito, se examinará un corpus documental compuesto por las Cartas del Hermano Superior General, los Capítulos Generales, las Circulares y algunos órganos de difusión elaborados en la Casa Generalicia de este instituto religioso.

This paper starts from a historical investigation that focuses on the study of the De La Salle Brothers. The main objective is to propose the revision of the documentation prepared by the Lasallian central administration in Rome between 1966-1989 as a way to understand and write the post-conciliar Lasallian past, a case that, at the same time, sheds light on the situation of the teaching congregations in the 20th century. Thus, for the fulfillment of this purpose, a documentary corpus consisting of the Letters of the Brother Superior General, the General Chapters, the Circulars and some periodic publications prepared in the General House of this religious institute will be examined.

Article

HUMANIDADES Y CIENCIAS DE LA CONDUCTA Hermanos de las Escuelas Cristianas Hermanos de La Salle Comunidades religiosas Iglesia posconciliar Congregaciones educadoras Casa Generalicia Brothers of the Christian Schools La Salle Brothers Religious communities Post-conciliar church Teaching congregations Casa Generalicia

Efecto de una intervención de enfermería en la higiene bucal de personas con síndrome de Down

MARIA ESTHER PATIÑO LOPEZ (2017)

Las personas con Síndrome de Down (SD) son vulnerables a enfermedades bucodentales afectando su calidad de vida y la de sus familias, por esto se promovió la mejora en el autocuidado de la Higiene Bucal (HB), con base en la Teoría de Dorothea Orem.

Objetivo: Determinar el efecto de una intervención de enfermería en la HB de personas con SD, en escuelas de Celaya, Gto. Método: Estudio cuantitativo, correlacional, cuasiexperimental, en alumnos con SD. Se utilizó un instrumento basado en la teoría de Orem para evaluar capacidades de autocuidado en la HB y el formato de control personal de placa bacteriana de la UNAM. Se implementó una intervención de enfermería. Se midió t de student pareada y para grupos independientes, con p < a 0.05.

Resultados: Muestra formada por 30 alumnos de 6 a 21 años. Las capacidades de autocuidado mostraron diferencia significativa post intervención (t= 2.81, gl= 28 and p= 0.0089)en dos capacidades que fueron: conocimientos (t= 2.54, gl= 28 and P = 0.02)y habilidades (t= 3.25, gl= 28 and P = 0.003); donde no hubo diferencia significativa fue en motivaciones(t= 1.22, gl= 28 and P = 0.23) y en el porcentaje de placa dento-bacteriana(t= -.87, gl= 28 and P = 0.40). Por la cantidad de muestra no hubo asociación y no fue posible medir razón de riesgos. Conclusiones: Es fundamental aplicar una intervención de enfermería para mejorar la HB de personas con SD favoreciendo sus capacidades de autocuidado y previniendo patologías bucodentales.

People with down syndrome (DS) are vulnerable to oral diseases that affects their quality of life and their families ones, so the improvement in the self-care of oral hygiene was promoted, based on the theory of dorothea orem.

Objective: To determine the effect of a nursing intervention on the oral hygiene of people with DS in schools in Celaya, Gto. Method: Quantitative, correlational and quasi-experimental study in students with DS. An instrument based on Orem's theory was used to evaluate self-care abilities in oral hygiene and an UNAM format of personal control of the dentobacterial plaque. A nursing intervention was implemented. All was analyzed with paired student t and for for independent groups, with p < a 0.05.

Results: Sample formed by 30 students aged between 6 to 21 years. Self-care skills showed a significant change post intervention (t= 2.81, gl= 28 and P = 0.0089), knowledge (t= 2.54, gl= 28 and P = 0.02) and skills (t= 3.25, gl= 28 and P = 0.003); which had no significant difference were motivations (t= 1.22, gl= 28 and P = 0.23) and the percentage of dentobacterial plaque (t= -.87, gl= 28 and P = 0.40). For the amount of sample there wasn´t association to analyzed x2, so it was not possible to measure the risk ratio. Conclusions: it is fundamental to apply a nursing intervention to improve the oral hygiene of people with ds favoring their capacities for self-care and preventing oral pathologies.

Master thesis

CCS- Maestría en Ciencias de Enfermería MEDICINA Y CIENCIAS DE LA SALUD CIENCIAS MÉDICAS CIENCIAS CLÍNICAS Síndrome de Down Higiene bucal Cuidados de Enfermería Teoría General de Enfermería de Orem Down's Syndrome Oral higiene Nursing care Orem's General Theory of Nursing

Interaction of Cocos and rivera plates with the upper-mantle transition zone underneath central Mexico.

XYOLI PEREZ CAMPOS (2014)

Receiver functions (RFs) from 224 permanent and temporary stations in central and southern Mexico were used to characterize the upper-mantle transition zone in that region. Discontinuities at 410 and 660 km depth are both deeper compared to iasp91, which reflects a slow velocity anomaly in the upper mantle. They show topography on the interfaces that is consistent with the interaction of the subducted slab or its broken off extension. A low-velocity layer on top of the 410 is identified mainly on the continental side of where the slab pierces it (i.e. in the lee of the slab roll-back). In general the RFs show a complex behaviour where the mantle has been disturbed by the lateral motion of the subducted slab, and are simple where it has not. Complexity on the 660 coincides with the place where the broken off portion of the Farallon Plate would have penetrated this interface or is possibly lying on top of it.

Article

MANTO DE PROCESOS TRANSICIONES DE FASE NORTEAMÉRICA Volcanic Belt Shallow earthquakes Waves Seismology concept8601 CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA CIENCIAS DE LA TIERRA Y DEL ESPACIO GEOFÍSICA SISMOLOGÍA Y PROSPECCIÓN SÍSMICA

Estimation of ground motion in Mexico City from a repeat of the m ~ 7:0 acambay earthquake of 1912

Shri Krishna Singh (2011)

The Acambay earthquake of 1912 (M ~ 7:0), which occurred in the central Trans-Mexican Volcanic Belt (CTMVB) about 100 km west-northwest of Mexico City, has been thought to be a critical scenario event in the estimation of seismic hazard of the city.We use seismograms of two small earthquakes located near Actopan (15 December 2003; 18 May 2010) and recorded at station CUIG, a hill-zone site in Mexico City, as empirical Green's functions (EGFs) for the Acambay region. Because Actopan, like Acambay, is situated in the CTMVB and both are located at about the same distance from CUIG, the use of the recordings of the Actopan earthquakes as EGFs is partly justified. We first analyze data of the two small earthquakes at a local station, DHIG, to estimate their seismic moment and stress drop. As there is considerable uncertainty in the estimated stress drops of the two events, we choose a reasonable range of values for them and apply a technique of random summation of EGFs to simulate ground motion at CUIG from a postulated Mw 7 earthquake. The estimated geometric mean horizontal peak ground acceleration (PGA) and peak ground velocity (PGV) at CUIG range from 2.7 to 9:7 cm=s2 and from 1.1 to 3:0 cm=s, respectively. Ground-motion maps for the entire city are presented using a simulated trace at CUIG and the known transfer functions of many sites within the city. The results are consistent with reported seismic intensities in Mexico City, and PGA and peak ground displacement (PGD) at a 2-s period at the seismic station of Tacubaya during the Acambay earthquake. Estimated ground motions suggest that a repeat of the event does not present significant hazard to Mexico City.

Article

CINTURION VOLCÁNICO TERREMOTO POCO PROFUNDOS EXTENSIÓN MAGNITUD OLAS ATENUACIÓN PREDICCIÓN GRABEN Waves Attenuation Shallow CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA CIENCIAS DE LA TIERRA Y DEL ESPACIO GEOFÍSICA SISMOLOGÍA Y PROSPECCIÓN SÍSMICA concept8601 Seismology

Magnitude determination of Mexican earthquakes

Shri Krishna Singh (1994)

We explore two altemative magnitude scales, MA and ME, for quasi-real time estimate of magnitude of moderate and large Mexican earthquakes using broadband recordings at Ciudad Universitaria (CU), Mexico D.F., Mexico. MA and Me are based on amplitude of band-pass filtered (between 15 and 30 sec) velocity traces and estimate of radiated seismic energy, respectively. Both scales are tied to the moment magnitude, MW. MA is adequate for shallow, moderate, and large earthquakes, but appears to saturate for major and great earthquakes. ME, on the other hand, does not suffer from saturation and should be valid for events of all depths. In as much as MA measures long-period characteristics of an event while the contribution to ME mostly comes from frequencies near the comer frequency of the event, the magnitude on the two scales may differ for the same earthquake, even if MA has not saturated. Since a large disparity in the two magnitudes may be indicative of anomalous nature of an earthquake, we recommend the use of both scales whenever possible.

Article

Magnitude scále Seismic energy Amplitude Escala de magnitud Energía sísmica Amplitud Magnitude scále Seismic energy Amplitude Seismology concept8601 Seismology CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA CIENCIAS DE LA TIERRA Y DEL ESPACIO GEOFÍSICA SISMOLOGÍA Y PROSPECCIÓN SÍSMICA

Reactivación de uveítis anterior asociada al HLA-B27+ y su asociación con situaciones de estrés

DOLORES ESTHER ISIDORA ARROYO GARZA (2020)

https://orcid.org/0000-0002-1419-2109

La uveítis es una condición inflamatoria del globo ocular que puede asociarse a enfermedades

autoinmunes, algunas de las cuales se han relacionado a situaciones de estrés psicológico y fisiológico.

Hasta ahora no se ha identificado una causa directa entre uveítis y estrés. Existen pocos estudios que

analizan esta relación, y no han sido del todo concluyentes. En México, no se cuenta con algún reporte

al respecto. Se realizó una evaluación prospectiva, no intervencionista en pacientes con uveítis anterior

asociada al HLA-B27 en un centro oftalmológico de tercer nivel en el noreste de México. Mediante

escalas validadas para la medición de estrés, comparamos el nivel de éste con el inicio o recurrencia de

un ataque agudo de uveítis, versus el grupo control compuesto de los mismos pacientes durante la fase

inactiva de la enfermedad. Encontramos que existe una asociación entre un episodio de uveítis anterior

en pacientes HLA-B27+ y un mayor nivel de estrés en comparación a periodos de inactividad. La

información obtenida en este estudio nos ayuda a establecer la relación que existe entre el nivel de

estrés y la activación de la uveítis. Asimismo, la importancia del seguimiento de estos pacientes

multidisciplinariamente, al ser esta una enfermedad recurrente y crónica que afecta a otros sistemas

corporales. En pacientes HLA-B27+ con uveítis anterior aguda se observó un nivel de estrés moderado-alto en dos escalas (PSS y HRSI). Se identificó un alto riesgo de presentar aflicción psicológica en un

ataque agudo mediante la escala GHQ-28, y no así en pacientes controles.

Especialista en Oftalmología

Article

MEDICINA Y CIENCIAS DE LA SALUD CIENCIAS MÉDICAS CIENCIAS CLÍNICAS OFTALMOLOGÍA