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Search Results: 1 - 10 of 230048 matches for " Roberto;López Meza "
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Alternativas para el control de la cenicilla (Oidium sp.) en pepino (Cucumis sativus L.)
Yá?ez Juárez, Moisés Gilberto;León de la Rocha, Jorge Francisco;Godoy Angulo, Tirzo Paúl;Gastélum Luque, Roberto;López Meza, Miguel;Cruz Ortega, Jacobo Enrique;Cervantes Díaz, Lourdes;
Revista mexicana de ciencias agrícolas , 2012,
Abstract: this research was conducted to know the effect of phosphorous and potassium salts in the growth and control of powdery mildew (oidium sp.) in cucumbers. cucumber plants of the variety poinset 76 with signs of the disease were sprayed with potassium bicarbonate, sodium bicarbonate, monopotassium sulphate, potassium nitrate, potassium chloride and potassium phosphite solutions. the application of salts showed no significant effects (p≤ 0.05) on the height and number of leaves of plants evaluated. with potassium phosphite, the incidence of the disease varied between 27.9 and 32.4%; with potassium bicarbonate, it was between 19.9 and 29.5%, and in the control, variation went between 44.1 and 47.4%. twenty-six days after the first application (dda), plants treated with potassium bicarbonate and potassium phosphite showed 67.7 and 62.0% less severity than the controls. forty-two dda with potassium bicarbonate and potassium phosphite, there was 49.4 and 44.5% less severity than in the control. results showed that the potassium phosphite and potassium bicarbonate at 5 and 4.7 g l, respectively, reduced significantly (p≤ 0.05) the incidence and severity of the disease.
Desarrollo de la especialidad en Psicología clínica en Costa Rica: perspectivas futuras
Roberto López Core
Revista Costarricense de Psicología , 2013,
Abstract: ResumenEn este trabajo se describen los antecedentes históricos, evolución y desarrollo de la Especialidad en Psicología Clínica en Costa Rica. En el a o 1957, se inició el ejercicio de esta disciplina y a partir del a o 1979 se consolidó el programa de estudios adscrito al Convenio Marco firmado entre la Universidad de Costa Rica (UCR) y la Caja Costarricense de Seguro Social (CCSS). Desde entonces, ha mantenido una acción ininterrumpida en la formación de especialistas. Los y las residentes en el proceso formativo tienen una doble condición: son funcionarios/as del sistema de salud de la CCSS y estudiantes de posgrado de la UCR. Se mencionan las perspectivas futuras y la inserción de esta disciplina en la implementación de la Política Nacional de Salud Mental en Costa Rica (2012). Se menciona, además, la relación e interacción con disciplinas afines como la Psiquiatría, la Neuropsicología, las Neurociencias y la rehabilitación psicosocial. Se hace referencia a las perspectivas futuras de su participación en otras áreas, como la Psicogeriatría, Psicooncología, Psicología de enlace, cuidados paliativos y la salud sexual y reproductiva. AbstractThe history, evolution and development of the Specialization in Clinical Psychology in Costa Rica is described along with its interaction with other disciplines in the healthcare system. This discipline was recognized in 1957 with the completion of the program of studies ascribed to the Framework Agreement signed between the University of Costa Rica (Universidad de Costa Rica, UCR) and the Costa Rican social security system (Caja Costarricense de Seguro Social, CCSS). Since then there has been a valuable and uninterrupted formation of specialists. The residents, in their formation stages, have a double character: they are staff members of the CCSS national health care system and are also graduate students of the UCR. Future perspectives for this discipline and its integration into Costa Rican national mental health policy (2012) are described. Mention is also made of the relationship and interaction with affiliated disciplines such as Psychiatry, Neuropsychology, neurosciences, and psychosocial rehabilitation. Future perspectives are also mentioned for participation in other fields such as psychogeriatrics, psycho-oncology, Liaison Psychology, palliative care, as well as sexual and reproductive health.
La plebe y los judíos. La construcción de un mito histórico en la Espa a del siglo XIX
López Vela, Roberto
Sefarad : Revista de Estudios Hebraicos y Sefardíes , 2004,
Abstract: After the abolition of the Spanish Inquisition there was a revival of the interest in the history of the deep cultural and social mark left by the Jews in Spain. Adolfo de Castro developed a new focus on the subject avoiding the relationship of Jews with masons and liberals as fashioned and diffused by conservative propaganda. He stressed the positive role played by the Jews in the history of Spain. He considered that the progressive decline of Spain happened as a result of a combination of the processes of oppression and eventual expulsion of the Jews. According to Castro; the idealization of the Jews was then conceived as standing opposite to popular prejudices and intolerance. Tras la abolición de la Inquisición espa ola, hubo un importante intento de recuperar la huella de la presencia judía en Espa a por parte de los historiadores liberales. Adolfo de Castro defenderá la importancia de la aportación judía frente a quienes renovaban la propaganda antijudía equiparándoles a masones y liberales, aunque potenciará otros tópicos en los que los judíos son el centro de la historia nacional. Para Castro, el declive de Espa a es la consecuencia de la combinación de los procesos de la opresión y expulsión de los judíos. En su visión, los judíos son idealizados como expresión de lo mejor de Espa a frente a un pueblo fanático e intolerante.
Peregrinos jacobeos en Oviedo a finales del siglo XVIII
López, Roberto J.
Cuadernos de Estudios Gallegos , 1991,
Abstract: Not available. No disponible.
Estudio mediante difracción de rayos X de las tensiones residuales producidas durante el depósito de películas delgadas de TiN sobre sustratos metálicos
Monsalve,Mónica; López,Esperanza; Meza,Juan; Vargas,Fabio;
Revista Facultad de Ingeniería Universidad de Antioquia , 2010,
Abstract: the influence of film thickness and the substrate type on the level and type of residual stresses generated on tin coatings are analyzed. two different physical vapor deposition (pvd) techniques: magnetron sputtering and ion plating were applied. two materials were used as substrate: stainless steel aisi 304 and aisi m2 tool steel. the study of the residual stresses, the present phases, the crystalline structure and the crystallographic texture of the deposited films was performed by x-ray diffraction analysis using the grazing method with a low incidence angle. the results show that the residuals stresses produced by both deposition techniques were of compression and that their level decreased by increasing the film thickness. moreover, the residual stresses were higher in those coatings deposited by magnetron sputtering than coatings produced by ion platting. the residuals stresses in the films deposited on the aisi 304 steel were greater than those produced in aisi m2 steel. this is due to the delivery energy mechanism to the layer growth and momentum of the ionized particles, which directly influence the microstructure and increase or decrease residual stresses. regarding the substrate, residuals stresses were greater on the films produced on aisi 304 steel, than those deposited on the aisi m2 steel, which is possibly due to the lower coefficient of thermal expansion of m2 steel.
Paisaje patrimonial y riesgo ambiental. Reocupación cultural y turística del espacio postminero en Lota, Chile
María Isabel López Meza,Claudia Vidal Gutiérrez
Revista de Geografía, Norte Grande , 2012,
Abstract: Los espacios mineros decimonónicos y de principios del siglo XX, poseen cada vez mayor reconocimiento entre planifi cadores, como una particular forma de patrimonio. Sus impulsores se alan la importancia de los vestigios mineros como testimonios de la revolución industrial, y su signifi cancia para la identidad local. De igual modo, han promovido su reutilización para el turismo cultural. Por otra parte, previo a su reutilización, diversos riesgos ambientales presentes en estos territorios deben ser considerados. A partir del ex poblado carbonífero de Lota, el artículo identifi ca los principales elementos del patrimonio minero y los riesgos ambientales asociados. Los resultados permiten constatar la profunda vinculación existente entre las áreas de mayor valor patrimonial y las de riesgo ambiental y, por lo tanto, la necesidad de un abordaje integrado de los objetivos de puesta en valor y los de remediación. Todo lo anterior, como requisito para una reutilización sostenible del espacio minero en la fase postextractiva.
Atomic Force Microscopy Studies on GaAs/In Bilayers Deposited on Si (100)  [PDF]
Miguel ángel Venegas, Roberto Bernal- Correa, Máximo López- López, álvaro Pulzara- Mora
Microscopy Research (MR) , 2015, DOI: 10.4236/mr.2015.31002
Abstract: GaAs/In bilayers were prepared by RF Magnetron Sputtering in an Ar atmosphere on Si (100) substrates using high purity (95.95%) GaAs (100) and In targets. The growth temperatures were 300oC and 580oC for the high purity targets of In and GaAs, respectively. Three samples were prepared: the deposition time (td) for the GaAs layers was fixed to 30 minutes, while varied for the In layers from td = 10, 15, and 20 minutes. The morphological and optical studies of the samples were made by means of Amplitude Modulation Atomic Force Microscopy (AM-AFM). In order to analyze and correlate surface morphology and alloy composition properties, the as-prepared samples were cleaved along the [001] direction and subsequently studied by AM-AFM-micrographs. From topographic images, a statistical study of the roughness and grain size was made. Additionally, cross sectional AM-AFM-micrographs were performed for each sample, where the phase channel, which is sensitive to the material properties of the specimen, was of particular interest.
Vicisitudes de la identidad y el desarrollo nacional
López Sánchez,Roberto;
Opción , 2008,
Abstract: this study analyzes the historical development of identity in venezuela from 1830 to the present and its influence on the independent development of the nation. identity is assumed to be a process in permanent construction and change. limitations existing on the emergence and strengthening of national identity during the beginnings of the republican period are considered. the absence of a national bourgeois development project is emphasized as the main obstacle to forming a strong national venezuelan identity that would bring this same growth to power. historical subordination to the foreign capital of elite rulers from 1830 to 1998 acted as a limiting element on national identity. the embryonic existence of a latin american identity, specific and differentiated from our cultural indigenous, european and african roots, is valued. the globalized world context and the threats implicit in the attempts of a world power center to homogenize peoples? cultures based on the american way of life, is considered. finally, the need for social change in latin america is mentioned, to foster in turn an identity that strengthens the road to the independent and sovereign development of our peoples.
Nuevos paradigmas para el siglo XXI
López Sánchez,Roberto;
Opción , 2003,
Abstract: this work analizes the paradigms proposed by the historiographic field starting from the manifesto of the red global history to debate, and its incident on venezuela and latin america. they are considered their own theories about the new historiography. they showed new proposals about the principal themes of the debate between the venezuelan historians. it concluded in that the manifesto was a contribution to the reconstruction of the historiographical paradigms; that the rupture of the eurocentrism and the positivism, the compromise with the social majorities and the changing process; and the public debate between the historians are works of the historiography of the 21° century.
Los movimientos estudiantiles en Venezuela, 1958-1990
Roberto López Sánchez
Historia Actual Online , 2006,
Abstract: El presente trabajo está centrado en los aportes del movimiento estudiantil al proceso político venezolano, en dos momentos clave: la renovación universitaria de 1969, y las protestas estudiantiles de 1987. Hemos identificado las particularidades de los diferentes grupos estudiantiles, y a sus principales dirigentes; sus mecanismos de intervención y de conflicto, su relación con los programas de partidos y movimientos políticos, y su incidencia en la situación política local y nacional. Recurriendo a fuentes biblio-hemerográficas, documentales y orales, el estudio consideró los aportes teórico-metodológicos de investigaciones relacionadas con los movimientos sociales en general y con el movimiento estudiantil en particular. Se concluye estableciendo que los movimientos estudiantiles fueron durante los primeros treinta a os de la democracia puntofijista los principales protagonistas del conflicto social en Venezuela.
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