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Search Results: 1 - 10 of 406742 matches for " Hernán Jaír; Rojas Molina "
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Demanda de mano de obra y rentabilidad de bancos forrajeros en Esparza, Costa Rica
Sánchez Sarmiento,Luz Yaneth; Andrade Casta?eda,Hernán Jaír; Rojas Molina,Jairo;
Acta Agronómica , 2010,
Abstract: we made a financial analysis in order to assess the feasibility to invest in fodder banks as an alternative for supplementing animals in dual purpose systems during the dry season (125 days). models were constructed to compare cutting and carrying of perennial woody fodder banks (veranera) cratylia argentea + sugar cane (saccharum officinarum) and browsing fodder banks of leucaena leucocephala with two supplements: concentrates and chicken manure. the indicators used for the financial evaluation of the systems were net present value (npv) and internal return rate (irr). a sensitivity analysis was carried out with an increase in milk, concentrate and chicken manure and labor prices. we found that perennial fodder banks required in average 71.1 man labor year-1 for their management. financial analysis showed that they are profitable when compared to chicken manure (npv= us$ 362.2; irr=17%) and concentrates (npv: us$ 1953.9; irr=39%). fodder banks with leucaena required 13 man labor year-1 for their management.. they are profitable when compared to chicken manure (npv=us$1594.7; irr=21%) and with concentrates (npv=us$3619.6; irr=35%). the models were sensible to changes in milk production, reduction in price of chicken manure and concentrates and reduction both in the labor price and price of milk. in summary, fodder banks are a good alternative for supplementing animal in the dry season and an important source of employment in the region; nevertheless, the high cost of hired labor could limit their adoption.
Demanda de mano de obra y rentabilidad de bancos forrajeros en Esparza, Costa Rica
Sánchez Sarmiento Luz Yaneth,Andrade Casta?eda Hernán Jaír,Rojas Molina Jairo
Acta Agronómica , 2010,
Abstract: En Esparza (Costa Rica) se evaluó la viabilidad de invertir en bancos forrajeros (BF) como alternativa de suplementación para vacas en sistema doble propósito durante la época seca (125 días). Se usaron como indicadores de rentabilidad el Valor Presente Neto (VPN) y la Tasa Interna de Retorno (TIR). Se realizó un análisis de sensibilidad para el incremento del precio de la leche, los concentrados, la gallinaza y la mano de obra. Los modelos se elaboraron comparando los BF de plantas le osas perennes de corte y acarreo de Cratylia argentea + ca a de azúcar (Saccharum officinarum) (BFC) y de ramoneo Leucaena leucocephala (BFL) vs. suplementos comerciales tipos concentrado y gallinaza. En los BFC se requirieron 71.1 jornales/a o y el análisis financiero indicó que son rentables al compararlos con la gallinaza (VPN = US$362.2, TIR = 17%) y concentrados (VPN = US$1953.9; TIR=39%). En BFL se requirieron 13 jornales/a o y fueron igualmente rentables en comparación con gallinaza (VPN = US$1594.7; TIR = 21%) y con concentrados (VPN = US$3619.6; TIR=35%). Los modelos fueron sensibles a la producción y cambios de precios en la leche, gallinaza, concentrados y el valor del jornal. Los BF son una buena alternativa para la suplementación de ganado en la época seca y una importante fuente de empleo en la región; sin embargo, los altos costos de la mano de obra contratada pueden limitar la adopción.
Nimesulide Betadex en el Tratamiento de Pacientes con Dorsolumbalgia de Origen Traumático
González,M; Gotera,A; Molina,A; Loisos,A; Posadas,A; de Montenegro,B; Villamizar,C; Acosta,C; Cuadros,C; Ascunce,C; Montes,C; Expósito,E; Díaz,E; Bracho,E; Guevara,E; Dorantes,F; Sánchez,G; Sandia de Molina,G; Rodríguez,G; Hernández,J; Rodríguez,JA; Mora,JG; Mayor,J; Torrealba,J; Villegas,J; Chávez,L; Guerrero,L; Torrealba,M; Freijoso,M; Ruiz,M del C; González,ME; Paz C,M; Rodríguez,M; Azócar,M; Ferrer,N; Zambrano,N; Sequera de Vital,N; Hernández,R; Romay,R; Mogollón,R; Rincón,R; Márquez,R; Ramírez,RA; Colmenares,R; Finol,R; Panquera de García,Y; Martínez,Y;
Archivos Venezolanos de Farmacología y Terapéutica , 2002,
Abstract: the low back pain is a frequent condition which the principal treatment is are the naids. in this study were evaluated 90 patients with diagnosis of low back pain, they received nimesulide betadex doses of 100 mg two time for day, for 10 or 15 days. these patients were evaluated throughout eva (0-10 cm) and functional scale. the treatment produced a significant decrease in vas scale after 48 hour from 7.42 to 5.15 (p<0.000) with similar changes between 48 hour and 5th and 10th days. similar evolution showed the functional capacity scale. the adverse effects happened in 6.6% of patients and their were epigastragia (2), dyspepsia (1), heartburn (2), allergic reaction (1), in this last patients were necessary stop the treatment. nimesulide betadex is a effective, quick and with good tolerance in the treatment of patient with low back pan.
Manejo de agua y nitrógeno en arroz riego en el Valle del Cauca Manejo de agua y nitrógeno en arroz riego en el Valle del Cauca
Barreto R. Jairo R.,Rojas Palacio Hernán
Acta Agronómica , 1987,
Abstract: El experimento, en el cual se sembró arroz Oryzica-2 en un vertisol (Typic Pellustert), se dise ó en un factorial incompleto 6 x 3 con arreglo de parcelas divididas. El suelo se mantuvo bajo una lámina de riego de 5.0cm o en saturación durante los períodos vegetativo, reproductivo y de maduración, los niveles de fertilización fueron de 80, 120 Y 160 kg de N/ha aplicados fraccionadamente. El mejor rendimiento (8170 kg/ha) se obtuvo con 160 kg/ha aplicando una lámina de 5.0 cm durante el período vegetativo, manteniendo luego el suelo saturado hasta 14 días antes de la cosecha. Los requerimientos de agua por E TP fueron de1187 mm y los factores K de 1.38 (30 - 65 días), 1.53 (65-110 Mas) y 1.48 (110-149 días). Field experiments were conducted to study the water management and nitrogen fertilizing in rice (Oryzica-2) planted in a verticsoil (Typic Pellustert) of the river Cauca Valley (Colombia). There were used 18 treatments consisted in keeping a 5.0 cm water table depth in the soil, or saturating it during three growing stages of the rice plant; N fertilizer levels were 80, 120 and 160 kg f ha applied in a fractionated form. The highest yield in brown rice (8170 kg/ha) was with the treatment of 160 kg/ha, applying a 5.0 cm water table on soil during vegetative stage and keeping it after saturated until 14 days before cropping. PET water requirements were 1187 mm, and the K factors of 1.38, 1.53 and 1.48 from vegetative, reproductive and maturity stages respectively.
La participación del Comité de Apoyo Educativo en el abordaje pedagógico de la integración educativa / The Support Educational Commitee Participation in the Pedagogical Approach of an Educational Integration
Angélica Fontana Hernández,Karla Durán Chacón,Viviana Martínez Ramírez,Viviana Rojas Molina
Revista Electrónica Educare , 2010,
Abstract: Recibido 22 de marzo de 2010 Aceptado 24 de junio de 2010 Corregido 03 de agosto de 2010 Resumen. Los servicios educativos son esenciales en el desarrollo social y económico de los pueblos, principalmente, para el progreso de todos los sectores de la sociedad. Establecer acciones que promuevan la participación de los diversos grupos sociales es esencial para mejorar su calidad de vida y la construcción de una sociedad más justa y respetuosa de los derechos humanos, sin ningún tipo de discriminación ni de exclusión. En los últimos a os, el sistema educativo costarricense ha experimentado cambios significativos, debido al abordaje pedagógico de la educación integradora, en la cual se atiende a aquellos estudiantes con necesidades educativas que requieren diferentes apoyos y recursos especializados para su formación y desarrollo integral. Por lo anterior, en la División de Educación Básica del Centro de Investigación en Docencia y Educación, se generó la inquietud de investigar sobre la participación del Comité de Apoyo Educativo en los proceso de integración educativa y, de esta forma, determinar las funciones que realiza en el contexto educativo. Según el Reglamento de la Ley 7600 Igualdad de Oportunidades para las Personas con Discapacidad, este comité es la instancia a la cual le corresponde regular el acceso a la educación mediante la definición de los apoyos requeridos por el grupo estudiantil que presenta necesidades educativas, así como asesorar y capacitar al personal docente y administrativo en los centros educativos tanto públicos como privados del país. También, se pretende indagar el papel que desempe a el docente de Educación Especial al interno de este comité, así como conocer las percepciones de los docentes y de los padres de familia acerca de las funciones que realiza dicho comité. Abstract. Educational services are essential to social and economical development of people, mainly to the progress of all sectors of society. Establishing actions that can promote the participation of various social groups is essential to improve their quality of life and building more respectful and fair human rights without any discrimination or exclusion. In recent years, the Costa Rican education system has undergone significant changes due to the pedagogical approach of inclusive education in which students with educational needs may require different support and specialized resources for training and development. For this, the Basic Educational Division of the Center for Teaching and Research in Education, generated a concern of investigating the p
Invasive fungal diseases in children with hematological malignancies and stem cell transplant recipients
José Ramón Molina,R. Rojas,J. Serrano,P. Gómez
Journal of Hematological Malignancies , 2012, DOI: 10.5430/jhm.v2n4p1
Abstract: Invasive Fungal Disease (IFD) remains a major cause of morbidity and mortality in patients with hematological malignancies or undergoing stem cell transplantation. New surrogate markers of IFD -galactomannan antigen, β-D-glucan, fungal polymerase chain reaction…- and the availability of modern antifungal drugs have changed the management of this serious complication, but both have limitations in children. There are still some unclear issues, particularly in pediatric patients, regardless of the medical and economic possibilities of hospitals: IFD remains difficult to diagnose in a timely way, stem cell transplant recipients have different risk of IFD, antifungal drugs are not free from adverse effects and prospective studies in children are scarce. In this sense, diagnosis criteria have to be assessed, risk stratification should be redefined and the different types of prophylaxis/treatment -prophylaxis, preemptive, empiric and targeted treatment- must be used correctly. We consider low risk for IFD children undergoing autologous stem cell transplantation and children with acute lymphoblastic leukemia, both should receive fluconazole as primary prophylaxis and empiric therapy with an agent with activity against mold. In those undergoing allogeneic stem cell transplantation or chemotherapy for acute myeloid leukemia, prophylaxis should be performed with a mold active agent -triazoles priority-. We rarely use preemptive therapy because of a high false positive rate of galactomannan. In proven and probable IFD we use targeted therapy, selecting a drug based on the type of infection, sensitivity to the drug in our hospital and prior antifungal prophylaxis/treatment. In selected patients, antifungal combination therapy should be a valid option. Despite great advances, there are still thought provoking questions on the diagnosis and management of IFD in children with hematological diseases.
Evaluación de variedades de soya (Glycine max (L) Merr) con diferente hábito de crecimiento según los niveles de riego
Chinchilla R. Germán,Carrillo S. Pedro,Agudelo D. Orlando,Rojas Hernán
Acta Agronómica , 1988,
Abstract: Se evaluaron 15 genotipos de soya Glycine max (L) Merr. de hábito de crecimiento determinado (CD), semideterminado (SO), indeterminado (CI) aplicando 5 niveles de riego suplementario y uno sin riego de efectos fijos en la época más seca del a o. Las variables fisiológicas, el rendimiento y sus componentes se evaluaron en R2 (floración completa), R2 (inicio de llenado de grano) R7 (madurez fisiológica) y R8 (cosecha). Las variables fisiológicas de la soya presentan óptima expresión con riego alrededor de 400 mm y reducciones significativas aplicando menos de 324 mm de siembra a cosecha. La disminución del IAF en R5 con niveles de poca humedad puede ser el principal mecanismo de tolerancia a sequía. Principalmente por la senescencia y abscisión de hojas de la planta. Las variedades entre y dentro de hábito de crecimiento difieren en su capacidad para sostener el rendimiento final, permitiendo seleccionar genotipos tolerantes a sequía (línea – 121 (CD) ICA- Tunía (CS) y L-141 (CI). Fifteen genotypes of Glycine max (L) Merr. with determinate (CO) semideterminate (SO) and indeterminate (ID) growth habits were evaluate by applying five levels of suplementary irrigation and one without irrigation of permanent effects during the year dry season. The physiologic variables, yield, components were evaluated in R2 (total flowering), R5 (begining of grain replenishrnen), R7 (physiologic maturity) and R8 (harvest). The physiologic variables of soybean present and optimun expression applying about 400 mm of irrigation, and showed an significant reduction applying less than 324 mm between planting and harvest. The reduction of foliar area index (FAI) in R5 and low humidity levels can be the main mechanism of drowght tolerance by senescence absition of leaves. The varietys inside and among the growth habits showed different in their capacity to surtain the final yield allowing to select genotypes for their drought tolerance (line L-121 (CO),ICA-Tunía (CS), L-141 (CI).
Rigid motions and generalized Newtonian gravitation. Lost in Translation
Xavier Jaén,Alfred Molina
Physics , 2012, DOI: 10.1007/s10714-013-1542-9
Abstract: We try to lay down the foundations of a Newtonian theory where inertia and gravitational fields appear in a unified way aiming to reach a better understanding of the general relativistic theory. We also formulate a kind of equivalence principle for this generalized Newtonian theory. Finally we find the non-relativistic limit of the Einstein's equations for the space--time metric derived from the Newtonian theory.
La ética: un nuevo reto para el profesional de la información en el siglo XXI
Rojas Mesa,Yuniet; Cabrales Hernández,Guzmán; Gregorio Chaviano,Orlando; Santos Jiménez,Magday; Molina Gómez,Ana María;
ACIMED , 2004,
Abstract: a reflection on the importance of an ethic attitude in information activities in the new library environment, distinguished by an intensive use of new technologies and the information outburst is provided. the main features, compromises and dilemmas that face the information professional daily are also enumerated.
La Ense?anza de los Estudios Sociales y la Educación Cívica: hacia una profesión interdisciplinar
Agüero García,Javier; Araya Ramírez,Iliana María; Marín Hernández,Juan José; Molina Vargas,Silvia Elena; Rojas Sandoval,Francisco Javier;
Diálogos Revista Electrónica de Historia , 2011,
Abstract: this paper analyzes the profession in the ense?anza de los estudios sociales y la educación cívica in the context of the reform of the curriculum offered by the escuelas de historia, geografía and formación docente, of the university of costa rica. primary sources to contextualize this career involved the analysis of books, essays, official documents, and the existing curriculum. we analyze the constitution of the profession from 1951 until today. also, the external context is explained according to international trends in the ense?anza de los estudios sociales y la educación cívica and so is studied the national context. we identify and confront the different offers in higher education in both, public and private sectors trying to determine the objectives, organizational structure, graduate profile and occupational field. finally, we consider updating the curriculum in the ense?anza de los estudios sociales y la educación cívica at the university of costa rica to be an urgent task because changes in higher education and social demands require public universities to offer appropriate, flexible curricular offerings according to social and cultural needs.
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