Cr2C3–NiCr VPS thermal spray coatings as candidate for chromium replacement

The present investigation has been carried out with the aim of determining the tribological behavior of a VPS chromium carbide coating both in the as-deposited and heat-treated conditions. A commercial powder of Cr2C3–25% NiCr was sprayed employing a VPS system (Medicoat AG, Switzerland) onto plain low carbon steel coupons. The samples were subsequently annealed for 2 h at 600 °C, 800 °C and 900 °C in Ar. The microstructural characterization was carried out by using SEM and XRD before and after the heat treatment of the samples. SEM observations were employed for determining the degradation mechanisms that took place during the wear tests. When the coated systems rubbed against alumina under a 5 N normal load in air, a progressive change in the mechanism, from a mixed adhesive and abrasive, to a predominant abrasive was observed, as the heat treatment temperature increased. The wear constants were found to be of the order of approximately 10− 6 mm3/N.m, which indicates a wear resistance of nearly 4 times higher in comparison with the wear results reported in the literature for similar coating systems obtained by employing HVOF deposition. However, the heat treatment carried out at 900 °C brought about only 20% increase in the sliding wear resistance of the coated system

Health, disability and consumption of psychoactive substances among people in a homeless situation in León (Nicaragua)

Nicaragua is one of the countries in Latin America with lowest levels of development. In Nicaragua, people in a homeless situation are one of the most socially excluded groups, and there is a lack of data regarding their characteristics, circumstances, and needs. This study examines the state of health, disability, and substance use among people living homeless (n = 68) in the city of León (Nicaragua). Sixty percent of the homeless people contacted responded to a questionnaire which was administered with the respondents by means of an interview. The findings showed that people living homeless in León had very negative states of health and disability, worse than those observed in other socially excluded groups in the same city and homeless people in more developed countries. The interviewees also presented a high level of substance abuse &- mainly of alcohol and inhaled glue.Universidad de Alcal

Stigma, extreme poverty and residential situation: Residential segregation, household conditions and social relationship satisfaction among trash pickers in Leon, Nicaragua.

This study analyses the housing characteristics, residential situation, household conditions and satisfaction with social relations of trash pickers (N=99) in León, Nicaragua. Results show that the trash pickers in León live in slum households. A large percentage of the trash pickers live in a situation of residential segregation, although a substantial number of them are scattered across different neighbourhoods in the city. However, this does not seem to affect the widespread social rejection perceived by those interviewed. The trash pickers live in overcrowded conditions, despite reporting a high level of satisfaction with their relationships with their relative

Evaluacion de la vulnerabilidad estructural por el fenomeno de flujo de detritos en viviendas de la localidad prolongacion 16 de noviembre, distrito y provincia – Ambo - 2019

La presente investigación tuvo por objetivo establecer la vulnerabilidad estructural ante el fenómeno de flujo de detritos en viviendas de la localidad Prolongación 16 de noviembre, distrito y provincia - Ambo - 2019. Metodología, Esta investigación fue de enfoque mixto, de alcance relacional, de diseño no experimental, población en estudio estuvo conformado por 24 viviendas de la localidad, se utilizó la técnica de observación y entrevista, se llegó al resultado de los factores condicionantes y desencante de flujo del flujo de detritos se concluye que la localidad Prolongación 16 de Noviembre, del distrito y provincia – Ambo - 2019, se encuentra en expuesto al peligro por flujo de detritos y presenta el 50.0 % de viviendas tienen muy alta vulnerabilidad estructural, el 29.17 % de viviendas tienen una alta vulnerabilidad estructural, 16.67 % tiene vulnerabilidad estructural media y el 4.17 % tiene vulnerabilidad estructural baja.Tesi

Evaluación del coeficiente de conductividad y transmitancia térmica de elementos constructivos de tierra

O objetivo deste trabalho é determinar a condutividade térmica de diferentes elementos construtivos de terra produzidos com materiais característicos do centro-leste da província de Santa Fé (Argentina) e avaliar sua adequação para uso na construção de envelopes de edifícios que atendam aos requisitos de isolamento térmico dos regulamentos nacionais correspondentes. Para isso, foram feitos corpos de prova de acordo com as diferentes técnicas de construção com terra utilizadas na região (bloco de terra comprimida, adobe, tapia, quincha e gesso) e foi medido seu coeficiente de condutividade térmica, com o qual foi calculada a transmitância térmica de diferentes pacotes construtivos de terra. Os resultados obtidos indicam que as técnicas de construção com terra avaliadas apresentam, em todos os casos, melhor desempenho térmico do que as tradicionais paredes sólidas de tijolos cerâmicos ou blocos de concreto, sendo a quincha a técnica com maior capacidade de isolamento térmico.En este trabajo se pretende determinar la conductividad térmica de diferentes elementos constructivos de tierra producidos con materiales característicos del centro este de la provincia de Santa Fe (Argentina) y evaluar su aptitud para ser empleados en la construcción de envolventes que cumplan con los requerimientos de aislación térmica solicitados por la normativa nacional correspondiente. Para ello se confeccionaron probetas siguiendo las diferentes técnicas de construcción con tierra empleadas en la región (bloque de tierra comprimida, adobe, tapia, quincha y revoques) y se midió su coeficiente de conductividad térmica, con el cual se calculó la transmitancia térmica de diferentes paquetes constructivos de tierra. Los resultados obtenidos indican que las técnicas de construcción con tierra evaluadas presentan, en todos los casos, un mejor desempeño térmico que los tradicionales muros de ladrillo cerámico macizo o bloques de hormigón, siendo la quincha la técnica con mayor capacidad de aislamiento térmico.The aim of this work is to determine the thermal conductivity of different earthen constructive elements produced with materials typical of the central-eastern part of the Province of Santa Fe (Argentina), and to evaluate their suitability to be used in the construction of envelopes that comply with the thermal insulation requirements of the corresponding National Regulations. For this purpose, test specimens were made following the different earth construction techniques used in the region (compressed earth block, adobe, rammed earth (tapia), wattle and daub (quincha), and plaster), and their thermal conductivity coefficient was measured, with which the thermal transmittance of different earth construction packages was calculated. The results obtained indicate that the earth construction techniques evaluated show, in all cases, a better thermal performance than traditional solid ceramic brick or concrete block walls, with wattle and daub being the technique with the highest thermal insulation capacity

Le projet d'extension du train léger sur rail (en direction nord-sud) de la ville d'Ottawa et la subvention optimale

Rapport de rechercheNuméro de référence interne originel : a1.1 g 105

Characteristics and needs of people living homeless in Leon (Nicaragua): Similarities and differences with other groups in severe social exclusion.

The study examines various aspects (e.g. socio-demographic characteristics, access to economic resources, social support, chronicity and access to new technologies) in a sample of homeless people living in León (Nicaragua; n=68). A questionnaire was used to collect the data. The results showed that people experiencing homelessness in León (Nicaragua) have enormous social difficulty, with high levels of chronification. Despite the major cultural and developmental differences between Spain and Nicaragua, there are considerable similarities between people living homeless in the two countries, while there are significant differences compared with waste pickers in León (Nicaragua) regarding the same aspects

Intersecting vulnerabilities, intersectional discrimination, and stigmatization among people living homeless in Nicaragua.

Objective: The main objective of this study is to examine the intersecting vulnerabilities, intersectional discrimination and stigmatization experienced by homeless people living in León (Nicaragua). Method: The data analyzed come from a Point-In-Time count carried out in the city of León, which identified 82 people living homeless. Forty-seven of the people identified responded to a brief questionnaire that provided more accurate information. Results: The results obtained showed that people living homeless in León largely presented "non-white" ethnic-racial traits, poor personal hygiene, readily visible physical health problems, and observable symptoms associated with mental health problems and alcohol and/or drug abuse. Conclusions: The information we obtained showed that people living homeless in León were subject to multiple intersecting vulnerabilities and aggravated forms of intersectional discrimination and social stigmatization, with a cumulative effect that could be highly detrimental to their social inclusion processes, leading to high levels of chronification of homelessness

A multi-purpose control and power electronic architecture for active magnetic actuators

This paper shows the results related with the design and implementation of a multi-purpose electronic architecture used to drive magnetic actuators by means of a three-phase independent-legs module in place of the commonly used H-bridge modules. The typical application is the magnetic actuators drive used in active magnetic bearings. The architecture is composed of a control unit with a floating point Digital Signal Processor (DSP), a power board with six independent phase legs and a carrier board to interconnect them. When more than one module is required by the application, the communication between them is guaranteed by means of CAN bus interconnection. The proposed system allows to drive two pairs of opposite electromagnets, such as those typically used to control active magnetic bearings. The study is motivated by the opportunity of reducing the amount of power and control electronic components resulting in a more straightforward, efficient and cost reduction design