Desarrollo de la infraestructura y reducción de la pobreza: el caso peruano

In recent years, economic growth and the development of social programs have contributed significantly to poverty reduction in Peru. In this process, the development of infrastructure has been very important in reducing the long term vulnerability of households.This paper examines the role of infrastructure in reducing poverty in households in Peru within a dynamic perspective of poverty and under an asset-based approach. To do this, we estimate Logit models to reflect the impact of different types of infrastructure on the likelihood of being poor in Peru. We also estimate static panel data models (fixed and random effects) to reflect the impact of the different types of infrastructure on the spending ofPeruvian households. Both groups of models are based on information at the household level for the years 2007-2010 from the Peruvian official household survey provided by INEI. These impacts are estimated considering the sex of the household head and the area of residence(urban or rural). For static panel data models, we estimate the impact of the different types of infrastructure on household spending distinguishing whether they are transient poor or chronically poor. Given the data constraints at the household level in Peru, we only analyze the following infrastructures throughout the document: water, sewage, electricity and telecommunications. From the results, we verify a significant and different impact of the various types of infrastructure on poverty according to the area of residence and the gender of the household head. Similarly, we verify a significant and different impact of infrastructure on the types of poverty (transient and chronic poverty).Infraestructura, pobreza, ingresos, enfoque de activos, dinámica de la pobreza.

DISPLASIA DE CADERA CANINA

La Displasia de Cadera Canina es una anomalía de la articulación coxofemoral caracterizada por cursar con inestabilidad, diferentes grados de laxitud de los tejidos blandos adyacentes, malformación de la cabeza femoral y del acetábulo, y osteoartritis. Esta anomalía suele desarrollarse durante el crecimiento de la articulación, y considerando su compleja etiopatología multifactorial, los factores más influyentes vistos hasta el momento se podrían agrupan en: un componente genético y otro componente medioambiental. El diagnóstico se apoya en una exploración clínica sumada a hallazgos radiológicos. Los hallazgos radiológicos son considerados como determinantes del diagnóstico definitivo. Existen diferentes opciones terapéuticas dependiendo de la edad del individuo, del dolor, de los hallazgos clínicos y radiológicos, del estilo de vida y de las posibilidades económicas del propietario. Las opciones quirúrgicas más habituales son: la sinfisiodesis púbica juvenil, la osteotomía pélvica doble o triple, el reemplazo total de cadera y la osteotomía de cuello y cabeza femoral. Por otro lado, las opciones médicas son: control de la condición corporal, personalización del ejercicio, medicación analgésica, suplementos nutricionales y fisioterapia.<br /

Efeito da doxiciclina e da minociclina em células osteoblásticas humanas: estudos in vitro

A doxiciclina e a minociclina são antibióticos utilizados para eliminar infecções que surgem após o processo cirúrgico e que parecem exercer uma acção benéfica sobre o metabolismo ósseo. Os resultados obtidos neste estudo mostraram que baixas concentrações destes fármacos(1-5 μg.ml-1) estimularam a proliferação das células de medula óssea humana. A exposição das células a 10 μg.ml-1 de minociclina pareceu estimular o aparecimento de uma população celular mais proliferativa mas menos diferenciada. As concentrações de 10 μg.ml-1 de doxiciclina e 25 μg.ml-1 de minociclina atrasaram a mineralização e concentrações mais elevadas destes antibióticos (25 μg.ml-1 de doxiciclina e 50 μg.ml-1 de minociclina) foram citotóxicas. Doxycycline and minocycline are antibiotics used to eliminate infections that arise after the surgical procedure that seem to have a beneficial action in bone metabolism. Results showed that low concentrations of these drugs (1-5 μg.ml-1) stimulated human bone marrow cell proliferation. The exposure of cells to 10 μg.ml-1 minocycline stimulated the emergence of a more proliferative population but less differentiated. Concentrations of 10 μg.ml-1 doxycycline and 25 μg.ml-1 minocycline delayed the mineralization and higher concentrations of these antibiotics (25 μg.ml-1 doxycycline and 50 μg.ml-1 minocycline) were cytotoxic

The effects of tigecycline on human osteoblasts in vitro

A osteomielite, infecção no tecido ósseo, é uma doença que afecta gravemente os pacientes, uma vez que destrói grandes quantidades de tecido ósseo. A tigeciclina é um antibiótico recentemente disponível, que pode proporcionar melhores resultados no combate a infecções ósseas por organismos resistentes a outros antibióticos. Não existem na bibliografia dados disponíveis sobre a interacção da tigeciclina com as células ósseas. Neste trabalho foi demonstrado que a tigeciclina em elevadas concentrações tem efeitos nocivos para o tecido ósseo nomeadamente na proliferação dos osteoblastos. Esta informação deve ser ponderada na aplicação de dispositivos de aplicação local do antibiótico. Em baixas concentrações este fenómeno não foi verificado. Osteomyelitis (bone tissue infection), is a very serious disease affecting many patients by destroying large portions of bone tissue. Tigecycline is a recently available antibiotic to overcome bacteria resistance phenomena in bone tissue infections. No information is available regarding its direct effects on bone cells. We have demonstrated deleterious effects of high tigecycline concentrations on viability and proliferation of osteoblasts in vitro. This finding should be carefully taken into account when a local antibiotic application is used. However, at lower concentrations tigecycline this effect was not observed

Oral microbiome associated with peri-implant infections – a review

Dental treatments using dental implants have been well documented over the past 40 years and with great success. The dental implant installed in the place of missing teeth should always involve proper forecasting by the dentist. Namely, it is important to know the microbiome surrounding the implant, from its planning till final rehabilitation. The exact time of microbiome formation, as well as microorganisms involved, are essential for the proper implementation and success of the implant. However, internal contaminations of the rehabilitated implants, the extracellular components of microorganisms, such as endotoxins, have a huge influence on implant success. In addition, it is also very important the knowledge concerning implants surfaces and associated microorganisms. This study conducted a literature review on the oral microbiome and its relationship with the peri-implant infection, with the discussion of several classical and current studies. Although it can be concluded that the peri-implant microbiome is characterized by the microbiome present before dental implant placing, more studies are required to better elucidate the planning and the longevity of dental implant treatment.info:eu-repo/semantics/publishedVersio

Numerical and experimental evaluation of dielectric properties of thermally aged insulating paper used in power transformers

Due to the relevant role of the cellulosic insulation in the dielectric system of a power transformer, it is necessary to know its dielectric properties and its evolution as insulating material. The dependence of the dielectric properties of solid insulation on the moisture content, temperature, or pressure is well-defined. However, it is not clear the effect of the paper degradation on its insulating capacity. To study the impact of ageing on the dielectric properties, samples of Kraft paper were subjected to an accelerated hygrothermal ageing. Degree of polymerization (DP) value was reduced from 1000 to 200, with intermediate study points. All samples were conditioned to the same moisture content in order to only evaluate the effect of the paper degradation. Different dielectric properties, such as loss factor (tanδ) and complex permittivity (ε) were measured using the dielectric spectroscopy technique. These experimental results were used to develop a numerical model with the finite element-based tool Comsol Multiphysics. This model provided some extra information about the material properties, such as the electric field distribution. Results showed that the degradation of Kraft paper modifies its dielectric response.We acknowledge the support of the Spanish Ministry of Science and Innovation by means of the National Research Project Asset management of biodegradable-fluid-based transformers (PID2019-107126RB-C22/AEI/ 10.13039/501100011033). The authors also wish to thank “Fundación Iberdrola” for its financial support for the research project: S090 “Análisis de las Propiedades Dieléctricas de Aislamientos Sólidos Impregnados con Líquidos Dieléctricos”. C. Méndez also wants to acknowledge the Spanish Ministry of Science, Innovation and Universities for the financial support for the FPU grant (FPU19/01849)

Estimating the age of power transformers using the concentration of furans in dielectric oil

Transformers have an insulation system based on dielectric oil and paper. Several factors as shortcircuits, high load, or overheating influence the aging of the insulating system. Thus, these materials are decomposed during transformer operation, and its state determines the status of the transformer. The degree of polymerization of dielectric paper is an indicator of its real condition. The concentration of furanic compounds in oil offer an estimation of paper degradation. Moreover, these compounds are easy to measure from oil samples. This paper review equations which relate one or more properties of the insulating system with the life expectancy of the transformer. These equations were used in a fleet of transformers in order to estimate the accuracy of these mathematical models. Results show that these methods achieve the most reliable estimation when the transformers have operated less than 8 years. Nevertheless, when the transformers are older, the estimation of lifetime based on furanic compounds is quite erratic and should be improved.The research leading to these results has received funding from multiple sources during years but we would specifically like to acknowledge the support received in the later stages from the Spanish Plan Estatal de I+D under the grant agreement DPI2013-43897-P

Hydraulic assessment of nanofluids based on mineral oil and natural ester in windings of power transformers

It is common for electric power transformers to be cooled by mineral oil. However, this type of oil has begun to be replaced by oils of natural origin (esters), due to environmental and fire safety reasons. The latter are biodegradable and have an ignition point much higher than that of mineral oils. On the other hand, different authors have found that the dielectric and refrigerant properties of the oils used in transformers can be improved when some types of nanoparticles are added. In order to assess this improvement, this work presents the results obtained by a research in which different nanofluids, produced through commercial dielectric oils (mineral and natural), nanoparticles of titanium (IV) oxide and magnetite, were thermally characterized. The results of this characterization have been used to perform simulations based on computational fluid dynamics. This comparison has allowed to observe the pressure drops and the mass flows in the internal channels of the windings of a real power transformer.The authors of this research wish to thank the Ministry of Economy for financial support to the National Research Project: Improvement of Insulation Systems of Transformers through Dielectric Nanofluids (DPI2015-71219-C2 1-R)

Titania nanofluids based on natural ester: cooling and insulation properties assessment

The assessment of a TiO2 vegetal-based dielectric nanofluid has been carried out, and its characteristics and behavior have been tested and compared with a previously tested maghemite nanofluid. The results obtained reflect a similar affectation of the main properties, with a maximal improvement of the breakdown voltage of 33% at 0.5 kg/m3, keeping the thermal conductivity and the viscosity almost constant, especially the first one. This thermal characterization agrees with the results obtained when applying the TiO2 optimal nanofluid in the cooling of an experimental setup, with a slightly worse performance than the base fluid. Nevertheless, this performance is the opposite to that noticed with the ferrofluid, which was capable of improving the cooling of the transformer and decreasing its temperature. The similarities between the characterizations of both nanofluids, the differences in their cooling performances and their different magnetic natures seem to point out the presence of additional thermomagnetic buoyancy forces to support the improvement of the cooling.This research is under BIOTRAFO project—“Raising Knowledge and Developing Technology for the Design and Deployment of High Performance Power Transformers Immersed in Biodegradable Fluids,” which has received funding from the European Union Commission’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement H2020-MSCARISE-2018- 823969; 2019-21. The authors of this research wish to thank the Spanish Ministry of Economy for its financial support for the National Research Project: “Improvement of Insulation Systems of Transformers through Dielectric Nanofluids: Thermodynamic Characterizations and Modelling” (DPI2015-71219-C2 1-R). Additionally, they want to thank the Regional Government of Cantabria; more precisely, the Department of Universities, Research, Environment and Social Policy, for its financial support for the Project “Fluidos Biodegradables en Transformadores Eléctricos de Potencia: Impregnación de Dieléctricos Sólidos y Modelado Térmico con THNM.” Mr. Olmo would like to acknowledge to the University of Cantabria and the Government of Cantabria for the financial support for the Ph. D. scholarship (CVE-2016-6626)

Effect of TiO2 nanoparticles on the performance of a natural ester dielectric fluid

Mineral oil has been frequently used in most of high voltage transformers. However, this oil has started to be replaced by vegetable oils. Additionally, different authors have found that mineral oil-based nanofluids have a potential in improving insulating properties of transformer oil. In order to improve the characteristics of a commercial vegetal oil, this work has used TiO2 nanoparticles to obtain a nanofluid whose ageing behavior at 150°C for 300 hours has been studied.The authors of this research wish to thank the Ministry of Economy for financial support to the National Research Project: Improvement of Insulation Systems of Transformers through Dielectric Nanofluids (DPI2015-71219-C2 1-R)