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Search Results: 1 - 10 of 198246 matches for " Idán Tuval "
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Dynamic Modeling of the Electric Transportation Network
Alessandro Scirè,Idán Tuval,Víctor M. Eguíluz
Physics , 2005, DOI: 10.1209/epl/i2004-10533-6
Abstract: We introduce a model for the dynamic self-organization of the electric grid. The model is characterized by a conserved magnitude, energy, that can travel following the links of the network to satisfy nodes' load. The load fluctuates in time causing local overloads that drive the dynamic evolution of the network topology. Our model displays a transition from a fully connected network to a configuration with a non-trivial topology and where global failures are suppressed. The most efficient topology is characterized by an exponential degree distribution, in agreement with the topology of the real electric grid. The model intrinsically presents self-induced break-down events, which can be thought as representative of real black-outs.
La ense?anza de las teorías de la Administración: limitantes epistémicos y posibilidades pedagógicas
Marín Idárraga,Diego Armando;
Innovar , 2005,
Abstract: in its historical rising, the knowledge in administration has been structured on a vast production of wordings, some with theory status and the others with an ?air?of ideological speech. thus, the structure of administration knowledge has fluctuated between two kinds of logical arguments, that in occasions are crossed one is a type of theoretical rationality and the other one with praxis character. in the first typology the theories of administration are taking into account, the second one, focus on management. this paper expect to introduce a context of episthemological and educational reflection, that notices the necessity to differentiate the theoretical-practical duality at the moment to face the teaching of administration.
El sujeto humano en la administración: una mirada crítica
Marín Idárraga,Diego Armando;
Cuadernos de Administración , 2006,
Abstract: administration, a modern-age invention, was created towards the end of the 19th century as an expression of instrumental reasoning at the service of industrial capitalism. afterwards, the first attempts at creating formal theories for administrative practices were consolidated, based on contributions by taylor, fayol, mayo, and weber. their ideas, aimed at seeking how to achieve industrial efficiency, did not include the ontological understanding of the human beings in the organization. this paper takes a critical look at how human beings are conceived in the ambit of the administration theories that those authors espoused, for the purpose of establishing a window of reflection regarding human beings in organizations, to contribute to contemporary discussions that encourage a makeover for administration.
El sujeto humano en la administración: una mirada crítica Human beings in administration: a critical look
Diego Armando Marín Idárraga
Cuadernos de Administración , 2006,
Abstract: La administración, como invención de la modernidad, surge en las postrimerías del siglo XIX como una manifestación de la razón instrumental al servicio del capitalismo industrial. Esta circunstancia permitió consolidar los primeros intentos por teorizar formalmente la práctica administrativa, con base en los aportes de Taylor, Fayol, Mayo y Weber. Sus ideas, que se orientaron a buscar las mejores formas de alcanzar la eficiencia industrial, desatendieron la comprensión ontológica del sujeto humano en la organización. En el presente artículo se mira críticamente la forma como se concibió el hombre en el ámbito de las teorías de la administración, sustentadas por dichos auto-res, con el objeto de establecer un marco de reflexión acerca de lo humano organizacional que aporte a las discusiones contemporáneas que propenden por una administración renovada. Administration, a modern-age invention, was created towards the end of the 19th century as an expression of instrumental reasoning at the service of industrial capitalism. Afterwards, the first attempts at creating formal theories for administrative practices were consolidated, based on contributions by Taylor, Fayol, Mayo, and Weber. Their ideas, aimed at seeking how to achieve industrial efficiency, did not include the ontological understanding of the human beings in the organization. This paper takes a critical look at how human beings are conceived in the ambit of the administration theories that those authors espoused, for the purpose of establishing a window of reflection regarding human beings in organizations, to contribute to contemporary discussions that encourage a makeover for administration.
Ethical principles for the guidance of physicians in medical research: the Declaration of Helsinki
Id?np??n-Heikkil? Juhana E.
Bulletin of the World Health Organization , 2001,
Abstract:
Quasiparticle Resonances in the BCS Approach
R. Id Betan,N. Sandulescu,T. Vertse
Physics , 2005, DOI: 10.1016/j.nuclphysa.2006.03.003
Abstract: We present a simple method for calculating the energies and the widths of quasiparticle resonant states. The method is based on BCS equations solved in the Berggren representation. In this representation the quasiparticle resonances are associated to the Gamow states of the mean field. The method is illustrated for the case of neutron-rich nuclei $^{20-22}$O and $^{84}$Ni. It is shown that the contribution of the continuum coupling to the pairing correlations is small and largely dominated by a few resonant states close to the continuum threshold.
Consumption of, and beliefs about fonio (digitaria exilis) in urban area in mali
N Fanou, Y Koreissi, RAM Dossa, ID Brouwer
African Journal of Food, Agriculture, Nutrition and Development , 2009,
Abstract: The study sought to determine beliefs and practices about neglected crops in West Africa, using fonio (Digitaria exilis) as a model to understand how obstacles impede the consumption of this cereal in Bamako, the capital city of Mali. This was a crosssectional study on food ethnography in three steps: a market survey on availability of fonio, a food consumption survey on utilisation of fonio, and on beliefs on and attributes of fonio. The study covered the pre-harvest and post-harvest periods and involved key informants, food vendors, and women of reproductive age in households. Fonio, as all cereals, is available year-long on markets in Bamako, and is abundant from September to May before most of the common cereals mature. More than two-thirds (68%) of the women reported having consumed fonio one to three times a month. Fonio was more consumed as snack (djouka) on working days (62%) than on weekend and special event days, suggesting that encouraging the development of ready-to-serve fonio-based products would help increase the consumption of fonio among women in urban area. The average individual portion size of fonio was 152g/day, and the contribution to daily energy intake was 16%. A large share of the women was convinced that eating fonio was good for them (95%) and their family members (94%). Also, most of them thought that fonio had good cooking, organoleptic and nutritional qualities and could contribute to diet’s variation (91% to 100%). Decision by the women to purchase or prepare fonio in the household could be favourably influenced by factors such as media, household members suffering from anaemia, neighbouring people buying fonio and shortage of other cereals; whereas shortage of fonio products (77%), high cost of fonio products (69%), difficult cooking process (51%), and lack of knowledge about processing and cooking fonio (43%) were likely to limit fonio consumption among the women. Also, in the present study, fonio was perceived to be for rich people by more than half (58%) of the women. Improving cooking process and knowledge of the women about fonio cooking, as well as creating a demand for the women with the household’s head and others through media, social and health care services would help increase fonio consumption in Bamako.
Puerperal seizures: not the usual suspects
ID Hayes, K Enohumah, N Hayes, C McCaul
Southern African Journal of Anaesthesia and Analgesia , 2011,
Abstract: We present a case of puerperal seizures and neonatal flaccidity due to abuse and abrupt withdrawal from zolpidem, following an elective Caesarean delivery at term.
Rehidratación posejercicio: La forma de distribuir la ingesta de un volumen constante de líquido no altera su conservación Post-exercise rehydration: The protocol for distributing a fixed fluid volume intake does not change fluid conservation
Alexandra Pérez Idárraga,Luis Fernando Aragón Vargas
Pensar en Movimiento : Revista de Ciencias del Ejercicio y la Salud , 2011,
Abstract: Propósito: evaluar la efectividad de tres protocolos de ingesta de un volumen de bebida deportiva, en la rehidratación posejercicio, según la capacidad de conservar el líquido ingerido dentro del cuerpo. Metodología: en tres días distintos separados por una semana, 11 hombres sanos, físicamente activos, de 21±2 a os, 68.7±9.0 kg de peso y 1.72±0.05 m de estatura fueron deshidratados mediante ejercicio al 1.97%±0.20 (media±D.E) del peso corporal, en un cuarto de ambiente controlado (aproximadamente a 32úC y 60% hr). Posteriormente bebieron un volumen de bebida deportiva, equivalente al 120% del peso perdido cada media hora durante hora y media, según uno de tres protocolos de ingesta (asignados aleatoriamente): (IG) porciones iguales (tres porciones equivalentes cada una a 40% del peso perdido), (AS) ascendente (porciones de 25, 40 y 55%) y (DES) descendente (porciones de 55, 40 y 25%). Luego se recogió la orina cada 30 minutos durante tres horas para medir su volumen. Se utilizaron ANOVAs de medidas repetidas para analizar los resultados obtenidos. Resultados: no hubo interacción entre el protocolo de ingesta y el tiempo sobre los volúmenes parciales de orina (p=.119). Tampoco se observó un efecto del protocolo de ingesta sobre el volumen total de orina (IG=670±278 mL, AS=649±184 mL, DES=750±421 mL; p=.609), ni en el porcentaje de conservación del líquido (IG=59.0±16.1%, AS=59.7±13.7%, DES=54.9±19.9%; p=.835). Conclusión : la distribución de un volumen constante de bebida deportiva en tres protocolos distintos de rehidratación posejercicio no produjo diferencias significativas en el volumen de orina, ni en la conservación del líquido ingerido. Purpose: To evaluate the effectiveness of three sports drink intake protocols on post-exercise rehydration, as measured by fluid retention in the body. Methods: On three separate days, one week apart, 11 healthy, physically active men (age = 21 ± 2 y, weight = 68.7 ± 9.0 kg, and height = 1.72 ± 0.05 m) were dehydrated by 1.97 ± 0.20% body mass (mean±S.D.) by exercising in a controlled environment chamber at approximately 32úC and 60% relative humidity. They were rehydrated with a volume of sports drink equivalent to 120% of body mass (BM) loss, distributed according to one of three intake protocols: constant (CON), three equal aliquots equivalent to 40% of BM loss each; ascending (AS) aliquots of 25, 40, and 55%; or descending (DES) aliquots of 55, 40, and 25%. They drank one portion every 30 minutes, over 1.5 hours; the order of treatments was assigned at random. Urine was collected at the end of rehydration and
REHIDRATACIóN POST-EJERCICIO CON AGUA DE COCO: IGUAL O MáS EFECTIVA QUE UNA BEBIDA DEPORTIVA?
Alexandra Pérez Idárraga,Luis Fernando Aragón Vargas
Revista en Ciencias del Movimiento Humano y Salud , 2011,
Abstract: Objetivo: comparar la efectividad rehidratante del agua de coco fresca, con el agua embotellada y una bebida deportiva. Metodología: once participantes de 22,0 ± 1,9 a os y 65,6 ± 13,0 kg de masa corporal (promedio ± D.E), asistieron al laboratorio en tres ocasiones, separadas entre sí por una semana. En cada sesión se deshidrataron por ejercicio en el calor hasta perder 1,84 ± 0,2% de la masa corporal. Luego fueron rehidratados en una hora, con agua comercial embotellada (AE), una bebida deportiva (BD) o agua de coco (AC), utilizando un volumen equivalente al 120% del peso perdido. Se evaluaron las sensaciones percibidas relacionadas con la tolerancia y la aceptación de las bebidas. Se recolectó la orina eliminada durante tres horas post-rehidratación. Resultados: Hubo interacción entre las bebidas y el tiempo sobre la orina excretada (p=0,003), siendo el AE estadísticamente diferente al AC y la BD a los 30 y 60 min post-rehidratación (p<0,05). El volumen total de orina fue mayor con agua embotellada (625 ± 183 mL), en comparación con AC y BD (390 ± 73 mL y 416 ± 200 mL, respectivamente, p<0,002); AC y BD no fueron distintas entre sí (p>0,05). Esto produjo porcentajes de conservación de líquido diferentes para AE (56%), con respecto a BD (71%) y AC (71%) (p<0,001). No hubo interacción entre las bebidas y el tiempo sobre las sensaciones percibidas de tolerancia (p>0,05). La percepción de la dulzura fue menor para AE (p= 0,024). BD obtuvo mejores puntajes de sabor y aceptación general (p<0,05). Conclusiones: el agua de coco fresca resulta tan efectiva como una bebida deportiva para conservar el líquido consumido, teniendo una buena tolerancia y aceptación. Podría ser usada como una bebida rehidratante, cuando la persona la tenga disponible y le agrade su sabor.
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