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Search Results: 1 - 10 of 56765 matches for " Carlos Chávez "
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Diálogo no es negociación. Representación, toma de decisiones y operación política: los límites organizacionales del CGH
Carlos Chávez Becker
Revista mexicana de ciencias políticas y sociales , 2005,
Abstract: El presente trabajo se centra en el análisis de los mecanismos que el Consejo General de Huelga empleó para tomar decisiones, su esquema de representación y su forma de operación política con el fin de establecer algunas relaciones significativas entre tales elementos analíticos y los resultados obtenidos por la organización al término del conflicto en febrero de 2000. La principal intención es evaluar al CGH como la organización de los estudiantes en términos de su actuar político a la luz de los costos y beneficios que representó su actividad.
COSTOS DE CUMPLIMIENTO Y PODER DE MERCADO: APLICACION AL PROGRAMA DE COMPENSACION DE EMISIONES
VILLEGAS,CLARA INéS; CHáVEZ,CARLOS;
Cuadernos de economía , 2004, DOI: 10.4067/S0717-68212004012200004
Abstract: this article analyzes the impact of market power on a transferable emissions permit system (teps). the application is carried out for the case of the "programa de compensación de emisiones" in the city of santiago, chile, using data for 1997. in addition to the abatement costs, the costs of enforcing the system are also considered. specifically, the magnitude of the efficiency loss caused by a non-optimal initial allocation of permits is quantified. our results show that the costs of inducing complete compliance are important and its relevance depends on the target level of the aggregate emissions. finally, the results also suggest that the presence of market power causes a modest increase in total compliance costs. the result is robust to different levels for the parameters used in the simulations
Desarrollo regional y acción de base: El caso de una organización indígena de productores de café en Oaxaca.
Carlos Chávez-Becker,Alejandro Natal
Economía, sociedad y territorio , 2012,
Abstract: Este documento responde a la pregunta, qué factores hacen que una organización de base, compuesta por campesinos pobres, con bajo nivel educativo, marginados por los mercados y el gobierno, sean exitosos al insertarse en los mercados globales y promover procesos de desarrollo en su región? Nuestro argumento es que esto es posible cuando se combinan tres factores: 1) contactos con el exterior que le permiten a la organización construir puentes, aprender y desarrollar capacidades; 2) mecanismos internos de gobierno que posibilitan la participación en la toma de decisiones, así como representación, pluralidad y apropiación, entre otras, y 3) un interés amplio en el territorio y sus necesidades por parte de la organización, lo que le gana legitimidad para promover cambio social y desarrollo.
COSTOS DE CUMPLIMIENTO Y PODER DE MERCADO: APLICACION AL PROGRAMA DE COMPENSACION DE EMISIONES
CLARA INéS VILLEGAS,CARLOS CHáVEZ
Cuadernos de Economía , 2004,
Abstract: Este artículo analiza desde un punto de vista empírico el impacto de la presencia de poder de mercado en un sistema de permisos de emisión transferibles (SPET). La aplicación se realiza para el caso del Programa de Compensación de Emisiones (PCE) de la ciudad de Santiago de Chile, utilizando datos del a o 1997. El análisis de este artículo considera explícitamente, además de los costos de abatimiento de emisiones, los costos de fiscalización para inducir cumplimiento de la regulación. Específicamente, se cuantifica la magnitud de la pérdida de eficiencia causada por asignaciones iniciales de permisos no óptimas. Nuestros resultados muestran que los costos de inducir un completo cumplimiento son importantes y su relevancia depende de la meta ambiental deseada. Los resultados sugieren, además, que la presencia de poder de mercado produce un incremento modesto en los costos totales de cumplimiento. Este resultado es robusto para diferentes niveles de los parámetros usados en las simulaciones This article analyzes the impact of market power on a transferable emissions permit system (TEPS). The application is carried out for the case of the "Programa de Compensación de Emisiones" in the city of Santiago, Chile, using data for 1997. In addition to the abatement costs, the costs of enforcing the system are also considered. Specifically, the magnitude of the efficiency loss caused by a non-optimal initial allocation of permits is quantified. Our results show that the costs of inducing complete compliance are important and its relevance depends on the target level of the aggregate emissions. Finally, the results also suggest that the presence of market power causes a modest increase in total compliance costs. The result is robust to different levels for the parameters used in the simulations
Gravity Field Variations Associated with the Buried Geological Structures: San Marcos Fault (NE Mexico) Case Study  [PDF]
Vsevolod Yutsis, Yaneth Quintanilla-López, Konstantin Krivosheya, Juan Carlos Montalvo-Arrieta, Gabriel Chávez-Cabello
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.329160
Abstract: Gravity data are sensitive to local vertical offsets across high-angle faults, where rocks with different densities are juxtaposed. Yet high densities in some Mesozoic sedimentary rocks just above the basement may smear out the subtle gravity signatures of basement faults. At this study the gravity data processing tends to avoid ill-described “black-box” techniques. The study area is situated in the Palomas site, Cuatrociénegas region, Coahuila, NE Mexico. The San Marcos Fault is at least 300 km long and has WNW-ESE trend from the central part of Nuevo León State through Coahuila, and finally to the eastern part of Chihuahua State. Gravimetric data shows that the lowest values of free air and Bouguer anomalies are in the southern part of the area, and the highest values are in the western and central part of the area. Between these parts exists a zone of high horizontal gravity gradient. Configuration of linear elements of gravity field (gradient zones) delimited the San Marcos Fault in the San Marcos valley below thickness of recent sedimentary cover. Two density models were carried out, which showed that the Cretaceous rocks are in discordant contact with the Paleo- zoic rocks that can be related to the San Marcos Fault. The density was determinate using to Nettleton’s method, which results highlight the presence of the San Marcos Fault. Density models showed that the Quaternary sediments are in direct contact with the San Marcos Fault.
Constitutive and regulated expression vectors to construct polyphosphate deficient bacteria
Francisco P Chávez, Cecilia Mauriaca, Carlos A Jerez
BMC Research Notes , 2009, DOI: 10.1186/1756-0500-2-50
Abstract: As an alternative method to construct polyP-deficient bacteria we developed constitutive and regulated broad-host-range vectors for depleting the cellular polyP content. This was achieved by the overexpression of yeast exopolyphosphatase (PPX1). Using this approach in a polyphosphate accumulating bacteria (Pseudomonas sp. B4), we were able to eliminate most of the cellular polyP (>95%). Furthermore, the effect of overexpression of PPX1 resembled the functional defects found in motility and biofilm formation in a ppk1 mutant from Pseudomonas aeruginosa PAO1. The plasmids constructed were also successfully replicated in other bacteria such as Escherichia coli, Burkholderia and Salmonella.To deplete polyP contents in bacteria broad-host-range expression vectors can be used as an alternative and more efficient method compared with the deletion of ppk genes. It is of great importance to understand why polyP deficiency affects vital cellular processes in bacteria. The construction reported in this work will be of great relevance to study the role of polyP in microorganisms with non-sequenced genomes or those in which orthologs to ppk genes have not been identified.Polyphosphate (polyP) is a ubiquitous linear polymer of hundreds of orthophosphate residues (Pi) linked by "high-energy" phosphoanhydride bonds. The best-known enzymes involved in the metabolism of polyP in bacteria are the polyphosphate kinases (PPKs) that catalyze the reversible conversion of the terminal phosphate of ATP (or GTP) into polyP and the exopolyphosphatase (PPX) that processively hydrolyzes the terminal residues of polyP to liberate Pi [1,2].The involvement of polyP in the regulation of both, enzyme activities and the expression of large groups of genes is the basis for the survival of different bacteria, including pathogens, to stressing conditions and during adaptation to the stationary phase of growth [2,3]. PPK1 knockout mutant cells lacking polyP survive poorly during growth in the stationary
Poverty Goals
Chávez-Martín del Campo, Juan Carlos;
EconoQuantum , 2008,
Abstract: we develop a methodology to estimate the required time and the minimum necessary growth rate to meet a poverty goal for a series of counterfactual income distributions and growth scenarios. the methodology can be applied to most poverty measures and is illustrated with data from madagascar.
Evaluación nutricional, deficiencia de micronutrientes y anemia en adolescentes femeninas de una zona urbana y una rural del estado Zulia, Venezuela
Ortega,Pablo; Leal,Jorymar; Amaya,Daysi; Chávez,Carlos;
Investigación Clínica , 2010,
Abstract: female adolescents in reproductive age are a susceptible group to anemia and micronutrient deficiencies. the objective of this study was to know the nutritional, anthropometric and dietetic status, the prevalence of anemia, depletion of iron deposits (fed) and vitamin a deficiency (vad) in female adolescents. seventy-eight not pregnant female adolescents (15.9 ± 1.1 years old), from an urban and a periurban zone of maracaibo, and a rural zone near this city, without infectious and inflammatory processes, were analyzed. anemia in adolescents was considered when hb<120 g/l; fed: ferritin<12 μg/l; vad serum retinol<20 μg/dl; risk of vad (rvad) 20-30 μg/dl. the data were analyzed with the sas program and expressed as means ± standard deviations, statistical significance was considered when p<0.05. the percentage of caloric and protean adjustment in all groups was below the daily requirements. adolescents from the rural zone showed significant lower values of weight (p=0.0024), height (p=0.0027), body mass index bmi (p= 0.0487), fatty area (p=0.0183), mcv (p=0.0241), mch (p=0.0488), mhcc (p=0.0228), and the highest prevalence of anemia (66.67%), anemia+fed (33.33%), and anemia+fed+rvad (5.56%), with respect to adolescents from the urban zone. although, anemic adolescents from the rural zone showed a non significant decrease of the iron percentage adjustment. iron requirements are increased during adolescence, reaching a maximum at the peak of growth and remaining almost as high in girls after menarche, to replace menstrual losses. the low iron status among adolescents from the rural zone determine that this is a high risk group to anemia and fed and they require prevention, control and suplementation strategies.
COSTOS DE CUMPLIMIENTO DE REGULACIóN AMBIENTAL CON INFORMACIóN INCOMPLETA: APLICACIóN A FUENTES FIJAS DEL PCE DE SANTIAGO, CHILE
Clerger,Gaspard; Chávez,Carlos; Villena,Mauricio; Gómez,Walter;
Estudios de economía , 2009, DOI: 10.4067/S0718-52862009000200002
Abstract: we study the cost-effectiveness of a transferable emissions permit system (teps) vis a vis a system of emissions standards. our analysis includes along with abatement costs, the costs of enforcing the system to induce compliance. further, the analysis considers complete and incomplete information. the numerical simulations are performe for the case of fixed sources operating under the emissions compensation program (ecp) in santiago, chile. the results suggest that a teps is not oble to induce compliance at minimum enforcement costs, but this regulatory system allow the regulator to achieve the environmental target with minimum aggregate compliance costs.
Simulación bidimensional de esfuerzos de secado en la madera fuerzos usando CVFEM
Salinas,Carlos; Chávez,Cristian; Gatica,Yerko; Ananias,Rubén;
Ingeniería e Investigación , 2011,
Abstract: the work was aimed at simulating two-dimensional wood drying stress using the control-volume finite element method (cvfem). stress/strain was modeled by moisture content gradients regarding shrinkage and mechanical sorption in a cross-section of wood. cvfem was implemented with triangular finite elements and lineal interpolation of the independent variable which were programmed in fortran 90 language. the model was validated by contrasting results with similar ones available in the specialised literature. the present model?s results came from isothermal (20oc) drying of quaking aspen (populus tremuloides): two-dimensional distribution of stress/strain and water content, 40, 80, 130, 190 and 260 hour drying time and evolution of normal stress ( -2,5<σxx<1.2, mpa ), from the interior to the exterior of wood.
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