Análisis tecnico-economico del uso de las diferentes tecnicas de cañoneo en los campos operados por petro produccion

El presente trabajo es un Análisis Técnico - Económico del uso de las diferentes técnicas de cañoneo en los campos operados por Petroproducción. La importancia de que la operación de cañoneo resulte más eficiente radica básicamente en las penetraciones alcanzadas y por ende en las razones de productividades estimadas a partir de estas, sin dejar de tomar en cuenta el daño total generado por las diferentes técnicas de estudio. Para realizar un adecuado análisis de los diferentes sistemas de cañoneo, este trabajo muestra fundamentos teóricos y técnicos, selección de pozos y análisis económicos; encasillados en seis capítulos

Cuban Land Use and Conservation, from Rainforests to Coral Reefs

Cuba is an ecological rarity in Latin America and the Caribbean. Its complex political and economic history shows limited disturbances, extinctions, pollution, and resource depletion by legal or de facto measures. Vast mangroves, wetlands, and forests play key roles in protecting biodiversity and reducing risks of hazards caused or aggravated by climate change. Cuba boasts coral reefs with some of the region’s greatest fish biomass and coral cover. Although Cuba has set aside major protected areas that safeguard a host of endemic species, its environment is by no means pristine. Its early history is one of deforestation and agricultural production for colonial and neo-colonial powers. Using remote sensing, we find Cuba’s land today is 45% devoted to agricultural, pasturage, and crop production. Roughly 77% of Cuba’s potential mangrove zone is presently in mangrove cover, much outside legal protection; this is likely the most intact Caribbean mangrove ecosystem and an important resource for coastal protection, fish nurseries, and wildlife habitat. Even the largest watersheds with the most agricultural land uses have a strong presence of forests, mangroves, and wetlands to buffer and filter runoff. This landscape could change with Cuba’s gradual reopening to foreign investment and growing popularity among tourists—trends that have devastated natural ecosystems throughout the Caribbean. Cuba is uniquely positioned to avoid and reverse ecosystem collapse if discontinuities between geopolitical and ecosystem functional units are be addressed, if protection and conservation of endemic species and ecosystems services accompany new development, and if a sound ecological restoration plan is enacted

Self-management Practices and Perspectives of Spanish-speaking Older Dominican Adults with Type 2 Diabetes

Background. Type 2 diabetes is the fifth-leading cause of death in Latinos in the United States. Diabetes is a commonly occurring health condition in older adults, leading to complications that can severely impact quality of life and hasten death. The burden of diabetes is considerable in the older adult population; almost four-fifths of adults with diabetes are older than 59 years. Diabetes mortality can be reduced or delayed with effective management of the illness. Older minority adults are more likely to have higher rates of adult-onset diabetes than non-Hispanic Whites, yet few studies have examined the diabetes self-management practices of this group. These issues are particularly important to investigate in older Dominican adults in Washington Heights/Inwood, New York City, because this group has unique cultural beliefs and practices, is rapidly increasing in population, and has a variety of unmet health-related needs. This study explored specific barriers encountered (cultural and structural) and the extent to which external factors are associated with self-management practices among older Dominican community residents living in mainland US with type 2 diabetes. After 20 years of health disparities research and intervention older adults continue to have problems accessing health care due to structural and socio-cultural barriers. Methods. This investigation utilized qualitative in-depth interviews to examine the cultural and structural barriers to health care and self-management practices existing in this group. Results. Thirty Dominicans 55 years and older were recruited through a community-based senior resource center from the mainland US. Self-management practices for type 2 diabetes vary and are represented by commonly known factors, including: 1) diet modifications; 2) glucose monitoring; 3) medication adherence; 4) exercise, and 5) diabetes classes. Findings from this study illustrate that male and female participants have mixed self-management practices that assist them in managing their diabetes. In addition, participants are interested in “learning” how to manage their diabetes through their participation in classes and diabetes-related workshops. Home remedies (remedies caseros) for type 2 diabetes were identified in this study. Conclusions. Programs and services that promote healthy self-management practices of older Latino adults need to include a focus on the unique cultural beliefs and behaviors of the individual as well as the broader situational context that impacts their diabetes self-management. Such information is invaluable for researchers and health practitioners interested in diabetes self-management practices of older minority adults

The Importance of Health and Social Protection Assets in the Economic Welfare of Households in Mexico

This paper seeks determines how the possession of health and social protection assets affects the probability of a household belonging to a given quintile of a proposed asset ownership index.  An ordered logistic regression model was constructed. As a dependent variable, the quintile of each household was used according to the index. This research is  based on 48 explanatory variables from the 2020 National Income and Expenses Survey. It confirms that health and social protection assets are relevant in the location of households in a quintile according to its socioeconomic condition. Estimated marginal effects and predictions for every quintile, show that the effect of the assets varies according to the quintile. Ownership of specific assets increase the likelihood of belonging to the higher quintiles. The possession of a voluntary pension fund is the most relevant asset. The empirical results obtained may contribute to design more efficient inequality-reducing public policies by promoting its acquisition and thereby encouraging social mobility. Main limitations of this research are related with the small number of health and social-protection related variables in the survey.importancia de los activos de salud y protección social en el bienestar económico de los hogares en MéxicoEste artículo busca determina cómo la posesión de activos de salud y protección social afecta la probabilidad de pertenencia de un hogar a un determinado quintil de un índice de activos propuesto. Se construyó un modelo de regresión logística ordenada. Como variable dependiente se usó el quintil de cada hogar según el índice propuesto. Se usaron 48 variables explicativas de la Encuesta Nacional de Ingreso y Gasto de los Hogares 2020. Se confirma que los activos de salud y protección social son relevantes en la ubicación de los hogares en un quintil según su condición socioeconómica. Los efectos marginales estimados y las predicciones para cada quintil muestran que el efecto de los activos varía según el quintil y que determinados activos aumentan la probabilidad de pertenecer a los quintiles más altos. La posesión de un fondo de pensiones voluntario es el activo más relevante. Los resultados empíricos obtenidos pueden contribuir al diseño políticas públicas más eficientes para reducir la desigualdad al promover su adquisición e incentivar la movilidad social. Las principales limitaciones de esta investigación se relacionan con el número reducido de variables de salud y protección social en la encuesta

Elaboración de Mezcla de Concreto Incorporando Cenizas de Bagazo de Saccharum Officinarum como Reemplazante Parcial del Agregado Fino

La problemática de la alta demanda de agregados en el sector construcción conlleva a los investigadores a experimentar con materiales alternativos como las cenizas de residuos agrícolas. Por ende, este estudio tuvo como objetivo el uso de la ceniza de bagazo de saccharum officinarum o caña de azúcar (CBCA) como reemplazo parcial en peso del agregado fino en 1, 3, 5 y 7% para concretos de dos clases de resistencia (D1: f’c= 210 kg/cm2 y D2: f’c= 280 kg/cm2), evaluando sus propiedades físicas y mecánicas. Iniciando con la selección de temperatura ideal de quemado del CBCA de 650°C, obtenida mediante pruebas de resistencia compresiva de cubos de mortero, los diseños de mezcla se elaboraron en base a dicha ceniza. Los resultados reportaron disminuciones del asentamiento y densidad del concreto fresco con los reemplazos de CBCA por el agregado fino, mientras que el contenido de aire se vio afectado variadamente con aumentos para ambos grupos de diseños. Para la resistencia a la compresión se ve mejorada en un 13.2 y 6.2% para los diseños D1 y D2 con la inclusión de 3% CBCA a 28 días, de igual manera sucede con los resultados para el módulo de elasticidad, mientras que la resistencia a la tracción indirecta y la resistencia a la flexión presentaron las mayores ganancias con 5% CBCA para los diseños D1 y 3% CBCA para D2. En conclusión, es posible mejorar las propiedades del concreto con reemplazos en un rango de 3 a 5% del agregado fino por CBCA.TesisInfraestructura, Tecnología y Medio Ambient

Properties of synchronization in the systems of non-identical coupled van der Pol and van der Pol - Duffing oscillators. Broadband synchronization

The particular properties of dynamics are discussed for the dissipatively coupled van der Pol oscillators, non-identical in values of parameters controlling the Hopf bifurcation. Possibility of a special synchronization regime in an infinitively long band between oscillation death and quasiperiodic areas is shown for such system. Features of the bifurcation picture are discussed for different values of the control parameters and for the case of additional Duffing-type nonlinearity. Analysis of the abridged equations is presented.Comment: 19 pages, 9 figure