999 resultados para trabalho em ambientes extremos
Resumo:
Há indicativos de que recursos sociais do ambiente de trabalho, entre eles justiça organizacional, poderiam influenciar vínculos com o trabalho, além de impactarem os níveis de bem-estar dos trabalhadores. Além disso, evidências apontam que certas características psicológicas dos trabalhadores fariam variar positiva ou negativamente a magnitude da influência dos recursos sobre os vínculos com o trabalho e sobre bem-estar. Com base nessas evidências esse estudo teve como objetivo principal analisar a influência de justiça organizacional (distributiva, procedimentos e interacional) e capital psicológico sobre engajamento no trabalho e bem-estar subjetivo (balanço emocional e satisfação com a vida). A partir do objetivo principal, foram propostas quatro hipóteses: percepção de justiça organizacional aumenta o engajamento no trabalho (H1) e bem-estar subjetivo (H2); capital psicológico seria moderador da relação entre justiça organizacional e bem-estar subjetivo (H3) e da relação entre justiça organizacional e engajamento (H4), sendo que, níveis altos de capital psicológico fortaleceriam as relações. O delineamento utilizado foi de natureza quantitativa transversal, descritiva e com amostragem não probabilística. A partir de uma amostra composta por 293 trabalhadores com média de idade de 38,3 (DP=10,7) anos, dos quais um pouco mais da metade era composta por mulheres (56,3pc), oriundos de todas as regiões do Brasil, com predomínio da região Sudeste (65,2pc), mediu-se com escalas válidas e precisas, por meio de um questionário online, os níveis de justiça organizacional, capital psicológico, engajamento no trabalho e bem-estar subjetivo. Foram realizados dois conjuntos de análises de regressão linear múltipla para teste das hipóteses. No primeiro conjunto de análises, os resultados das regressões lineares múltiplas padrão indicaram que justiça organizacional influenciou os níveis de engajamento no trabalho e bem-estar subjetivo, sendo que, em relação a engajamento e balanço emocional, apenas a dimensão interacional da justiça foi preditora significativa, enquanto justiça distributiva foi a única preditora significativa de satisfação com a vida. No segundo conjunto de análises, as regressões lineares múltiplas hierárquicas de cada dimensão de justiça organizacional, juntamente com capital psicológico e termo de interação sobre engajamento no trabalho e sobre bem-estar subjetivo, indicaram que capital psicológico moderou as relações entre justiça de procedimentos e justiça interacional com engajamento no trabalho. Concluiu-se a partir dos resultados que a percepção de ser remunerado adequadamente pelos esforços no trabalho, participar das decisões que afetam o trabalho e ser tratado com respeito e sinceridade pode influenciar os níveis de orgulho e inspiração no trabalho, características de engajamento, além de poder aumentar os níveis de bem-estar subjetivo, contribuindo para a vivência predominante de afetos positivos e de avaliações positivas da satisfação com a vida. Além disso, apesar de não ser possível afirmar que trabalhadores com maiores níveis de crenças em sua capacidade para executar suas tarefas e com perspectivas positivas em relação ao futuro, possam prescindir de ambientes justos para se engajarem no trabalho, os resultados demonstraram que esses trabalhadores podem sofrer menos influência de justiça de procedimentos e interacional para estabelecerem esse vínculo com seu trabalho, demonstrando que essas características pessoais funcionariam como amortecedores diante da falta de recursos do ambiente.
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Reservoirs are the main sources of surface water in Brazil´s semiarid region. The majority of these water supplies, however, are compromised by eutrophication. A severe drought in 2012 contributed to significant losses in water volume, influencing the availability of resources (nutrients and light) for phytoplankton. The aim of this study is to understand the dynamics of the functional groups of phytoplankton and the factors that affect them during a severe drought in the semiarid reservoirs of the northeast. We therefore studied the Dourado, Gargalheiras and Passagem das Traíras reservoirs in Rio Grande do Norte from January 2012 to January 2013. The effect of drought favoured homogeneity within the reservoir, in relation to biotic and abiotic variables, notably the absence of water supply given the lack of flow from its tributaries (intermittent river). The phytoplankton functional groups of bloomforming cyanobacteria (SN, S1 and M) dominated throughout the year 2012, in both the shallow and deep areas of the three reservoirs studied. The groups were related to high concentrations of volatile solids, total phosphorus and ammonia, and high turbidity. Cylindrospermopsis raciborskii (SN group) was the species with the greatest biomass in the three reservoirs. M group (Sphaerocavum brasiliense) performed better in shallow waters with more available phosphorus. Our data showed that high concentrations of nutrients and low availability of light, besides the stability of the water column due to lack of flow and the system´s high residence time, favoured the dominance of bloom-forming cyanobacteria groups, especially those tolerant to shadow
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The effects of climate change on human societies have become the focus of many researchers for their research. Understanding weather patterns (circulation of the atmosphere, precipitation, temperature) is essences for predicting extreme weather, but analyze how these extreme events act in our society and look for ways to reduce the impact caused by these events is the great challenge. Using a concept very in the humanities and social sciences to understand these impacts and the adaptation of the society's vulnerability. The objective of this work is to develop and apply a methodology for evaluating fining scale and quantify the vulnerability of the Brazilian Northeast to climatic extremes, developing a methodology that combines aspects of vulnerability to drought, as well as socioeconomic and climatic indicators used to assess exposure, ability to adaptation and the sensitivity of geographical microregions of the region. The assessment of the susceptibility or degree of exposure to risk is the regional using the SPI (Standardized Precipitation Index) by the degree of magnitude dried (MD), the rate of precipitation such as PCD (Precipitation Concentration Degree) and PCP (Precipitation Period Concentration) helped characterize and regional climatology, these indices showed satisfactory results in the pilot study of Rio Grande do Norte to assess the degree of exposure to drought. Regarding sensitivity agricultural / livestock multivariate statistical technique to factor analysis showed acceptable results for the proposed model using data for the period 1990-1999 (P1). The application of the analysis of vulnerability considering the adaptive capacity, as the adaptive disability have almost similar results with much of the region's vulnerability to extreme south of Bahia state as a part of the semiarid region has a degree of vulnerability among moderate and mean
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The correct distance perception is important for executing various interactive tasks such as navigation, selection and manipulation. It is known, however, that, in general, there is a significant distance perception compression in virtual environments, mainly when using Head-Mounted Displays - HMDs. This perceived distance compression may bring various problems to the applications and even affect in a negative way the utility of those applications that depends on the correct judgment of distances. The scientific community, so far, have not been able to determine the causes of the distance perception compression in virtual environments. For this reason, it was the objective of this work to investigate, through experiments with users, the influence of both the field-of-view - FoV - and the distance estimation methods on this perceived compression. For that, an experimental comparison between the my3D device and a HMD, using 32 participants, seeking to find information on the causes of the compressed perception, was executed. The results showed that the my3D has inferior capabilities when compared to the HMD, resulting in worst estimations, on average, in both the tested estimation methods. The causes of that are believed to be the incorrect stimulus of the peripheral vision of the user, the smaller FoV and the smaller immersion sense, as described by the participants of the experiment.
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Through numerous technological advances in recent years along with the popularization of computer devices, the company is moving towards a paradigm “always connected”. Computer networks are everywhere and the advent of IPv6 paves the way for the explosion of the Internet of Things. This concept enables the sharing of data between computing machines and objects of day-to-day. One of the areas placed under Internet of Things are the Vehicular Networks. However, the information generated individually for a vehicle has no large amount and does not contribute to an improvement in transit, once information has been isolated. This proposal presents the Infostructure, a system that has to facilitate the efforts and reduce costs for development of applications context-aware to high-level semantic for the scenario of Internet of Things, which allows you to manage, store and combine the data in order to generate broader context. To this end we present a reference architecture, which aims to show the major components of the Infostructure. Soon after a prototype is presented which is used to validate our work reaches the level of contextualization desired high level semantic as well as a performance evaluation, which aims to evaluate the behavior of the subsystem responsible for managing contextual information on a large amount of data. After statistical analysis is performed with the results obtained in the evaluation. Finally, the conclusions of the work and some problems such as no assurance as to the integrity of the sensory data coming Infostructure, and future work that takes into account the implementation of other modules so that we can conduct tests in real environments are presented.
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When searching for food, animals often make decisions of where to go, how long to stay in a foraging area and whether or not to return to the last visited spot. These decisions can be enhanced by cognitive traits and adjusted based on previous experience. In social insects such as ants, foraging efficiency have an impact on both individual and colony level. The present study investigated, in the laboratory, the effect of distance from food, capture success and food size, and reward rate on decisions of where to forage in Dinoponera quadriceps, a ponerine ant that forage solitarily and individually make their foraging decisions. We also investigated the influence of learning on the performance of workers over successive trips searching for food by measuring the patch residence time in each foraging trip. Four scenarios were created differing in food reward rates, food size offered and distances colony-food site. Our work has shown that as a rule-of-thumb, workers of D. quadriceps return to the place where a prey item was found on the previous trip, regardless of distance, food size and reward rate. When ants did not capture preys, they were more likely to change path to search for food. However, in one of the scenarios, this decision to switch paths when unsuccessful was less evident, possibly due to the greater variation of possible outcomes ants could experience in this scenario and cognitive constraints of D. quadriceps to predict variations of food distribution. Our results also indicated a learning process of routes of exploration as well as the food site conditions for exploration. After repeated trips, foragers reduced the patch residence time in areas that they did not capture food and quickly changed of foraging area, increasing their foraging efficiency.
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The caatinga is considered the only exclusively Brazilian biome, with a total area of 735.000km². It is estimated that about 59% of this area has already been removed and only 2% are protected in conservations units. The region is characteristic by strong seasonality and heterogeneity in their environments. This paper sets generate information on morphological and population patterns Lanio pilatus in two areas of caatinga of Estação Ecológica do Seridó (ESEC – Seridó), Serra Negra do Norte - RN. Data collection was performed in six phases between July 2012 and December 2014, covering the end of the dry and rainy seasons in the region. The captures were performed with nets and individuals captured were marked with metal rings and measured (weight, wing length, tail, tarsus, culmen and tip of the bill to nostril). Through these measures, we observed that only males of open area range in weight during the dry and rainy season, youngs were significantly lower for all parameters measured, and males were larger than females in three characteristics (weight, wing length and tail) in open area and only one (wing length) in the closed area. The population parameters were generated from the mark-capture-recapture technique by program MARK, using the techniques of robust design and CJS. The survival probability of detection and population estimates varied with time. Only individuals of open area fluctuated in their estimates during the study. Overall, the environment was a great mediator of results which increases the need for more studies on the life history of the species in the region.
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Location systems have become increasingly part of people's lives. For outdoor environments, GPS appears as standard technology, widely disseminated and used. However, people usually spend most of their daily time in indoor environments, such as: hospitals, universities, factories, buildings, etc. In these environments, GPS does not work properly causing an inaccurate positioning. Currently, to perform the location of people or objects in indoor environments no single technology could reproduce for indoors the same result achieved by GPS for outdoors environments. Due to this, it is necessary to consider use of information from multiple sources using diferent technologies. Thus, this work aims to build an Adaptable Platform for Indoor location. Based on this goal, the IndoLoR platform is proposed. This platform aims to allow information reception from diferent sources, data processing, data fusion, data storage and data retrieval for the indoor location context.
Resumo:
Location systems have become increasingly part of people's lives. For outdoor environments, GPS appears as standard technology, widely disseminated and used. However, people usually spend most of their daily time in indoor environments, such as: hospitals, universities, factories, buildings, etc. In these environments, GPS does not work properly causing an inaccurate positioning. Currently, to perform the location of people or objects in indoor environments no single technology could reproduce for indoors the same result achieved by GPS for outdoors environments. Due to this, it is necessary to consider use of information from multiple sources using diferent technologies. Thus, this work aims to build an Adaptable Platform for Indoor location. Based on this goal, the IndoLoR platform is proposed. This platform aims to allow information reception from diferent sources, data processing, data fusion, data storage and data retrieval for the indoor location context.
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Based on the possibility of real-time interaction with three-dimensional environments through an advanced interface, Virtual Reality consist in the main technology of this work, used in the design of virtual environments based on real Hydroelectric Plants. Previous to the process of deploying a Virtual Reality System for operation, three-dimensional modeling and interactive scenes settings are very importante steps. However, due to its magnitude and complexity, power plants virtual environments generation, currently, presents high computing cost. This work aims to present a methodology to optimize the production process of virtual environments associated with real hydroelectric power plants. In partnership with electric utility CEMIG, several HPPs were used in the scope of this work. During the modeling of each one of them, the techiniques within the methodologie were addressed. After the evaluation of the computional techniques presented here, it was possible to confirm a reduction in the time required to deliver each hydroelectrical complex. Thus, this work presents the current scenario about development of virtual hydroelectric power plants and discusses the proposed methodology that seeks to optimize this process in the electricity generation sector.
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The nursing staff is now the largest contingent of professionals in healthcare environments, with more than 1.8 million professionals, and of these 15% are men, showing a masculinization of the historical profession and culturally conceived and carried out by women (COFEN / FIOCRUZ, 2013). This dissertation discusses the profession forward to some issues related to gender, quality of life and night work. Objective: To analyze the impact that shift work has the professional quality of life male, through a specific instrument to identify the main problems and joint damage to that front group to his professional activity. Methods: descriptivo, Cross-sectional study with a quantitative approach, performed with 72 professional male nursing staff, 41 (56.9%) nursing technicians, 18 (25%) of nursing assistants and 13 (18.1%) of nurses, in January 2015 in a university hospital in the city of Uberlândia (Minas Gerais). For this, we used the WHOQOL-BREF questionnaire. Quantitative variables were described as mean, standard deviation, maximum and minimum, in addition to the Shapiro-Wilk test and Kruskal-Wallis used in the data analysis, with a confidence level of 5% (p <0.05). Results: the profile of respondents, most are married 42 (58.3%) under the employment contract via Single Legal Regime 50 (69.4%) with mean age of 40 and having 16 years of service; and within a range of 0 to 100, the areas with better evaluation were the Social Relations (70.1) and psychological (67.5); already the worst were the Environment (57.4) and Physical (65.4). In the overall assessment, the average was 63.3 and staying below the national average (65-70). Thus, the professionals who were married obtained better scores, regardless of the category which is in the nursing team. Conclusions: The group is average, taking into account the standard deviation, but we can say that working conditions affect their profession, and these results allow the detection of the difficulties experienced by men of the nursing team, and can cooperate with the design strategies that benefit or minimize the search for conflicts that affect the health of these workers and their quality of life.
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O presente estudo buscou verificar se há diferenças significativas na utilização de práticas e ferramentas voltadas à gestão do conhecimento na opinião de trabalhadores presenciais e de teletrabalhadores. Para tanto, este estudo descritivo-quantitativo aplicou um questionário a 319 colaboradores, sendo 180 trabalhadores presenciais e 139 teletrabalhadores, todos atuantes em quinze empresas de porte médio ou grande da indústria de software no Brasil. Os resultados encontrados indicam que os teletrabalhadores pesquisados atestaram maior utilização de práticas e de ferramentas voltadas à gestão do conhecimento em suas rotinas de trabalho, em comparação aos trabalhadores presenciais analisados na pesquisa.
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SANTOS, Raimunda Fernanda dos; SILVA, Eliane Ferreira da. A importância da Arquitetura da Informação no planejamento de ambientes digitais inclusivos.In: SEMINÁRIO DE PESQUISA DO CENTRO DE CIÊNCIAS SOCIAIS APLICADAS,17.,2012,Natal/RN. Anais... Natal/RN: Centro de Ciências Sociais Aplicadas, 2012. Trabalho oral.
Resumo:
Nesta tese problematizamos o aprender, a partir do olhar dos estudantes do 7º e 8º anos, em uma escola da rede pública de ensino do município do Rio Grande/RS/Brasil. A escola, em 2011, optou por realizar um trabalho coletivo e cooperativo e modificou sua dinâmica de funcionamento transformando as salas de aula convencionais em Ambientes de Aprendizagem, nos quais os estudantes têm acesso a uma maior diversidade de recursos e a interação com os colegas é permanente, possibilitando o desenvolvimento de estratégias diferenciadas motivando o aluno a estabelecer relações entre o conhecimento escolar, a sua vida e o mundo. Nesta escola, são os estudantes que se deslocam de um ambiente para outro, a cada duas horas, os professores permanecem com a sala organizada, conforme as necessidades e materiais pedagógicos e tecnológicos por área de conhecimento. Para conhecer como os estudantes aprendem neste novo ambiente realizamos diversos questionamentos como: o que significa aprender em Ambientes de Aprendizagem, como eram as aulas nas salas de aulas convencionais e como são as aulas nos Ambientes de Aprendizagem. Adotamos o Discurso do Sujeito Coletivo (DSC) como metodologia de análise, buscando a recursividade nos discursos individuais o que permitiu a construção dos discursos coletivos que denominamos Aprender “ontem” nas salas de aula, Aprender “hoje” nos Ambientes de Aprendizagem e Aprender com o material pedagógico. Os discursos evidenciam mudanças no aprender, em decorrência da transformação das salas de aula convencionais em Ambientes de Aprendizagem. Mostram ainda que os estudantes percebem as aulas mais dinâmicas e que agora tem liberdade para levantar e dialogar com os colegas e/ou para usar o material didático disponível no ambiente. Destacam um maior interesse de ambas as partes evidenciando que a ação docente está mais acolhedora e que acreditam em uma grande mudança na educação. A análise dos discursos nos possibilitou compreender que trabalhos realizados em ambientes coletivos e desafiadores modificam o aprender pela liberdade de ação, de expressão e pelo respeito ao outro como legítimo outro na convivência.
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Este trabalho tem como objetivo a comparação da intensidade, frequência e distribuição de um conjunto de índices de estabilidade atmosférica simulados entre o clima histórico (1986-2005) e um cenário climático (2081-2100) na Península Ibérica. Considerou-se o cenário de emissão de gases RCP8.5. Estes índices avaliam a instabilidade atmosférica que é um elemento fundamental e percursor no desenvolvimento de tempestades. Através dos seus valores limite, é possível estimar alterações na probabilidade de ocorrência de eventos extremos que se poderão desenvolver no clima futuro, relativamente ao histórico. Primeiro, utilizou-se um conjunto de simulações do WRF com dois forçamentos: reanálises do ERA-Interim e um modelo do Max Planck Institute. De seguida, foram calculados diferentes índices de estabilidade. A validação do modelo consistiu no cálculo das médias sazonais, da sua diferença e das respetivas PDFs dos índices simulados pelo WRF-MPI e WRF-ERA. Verifica-se uma sobrestimação do CAPE, SHR6km (vento de corte) e SWEAT simulados pelo WRF-MPI. No entanto, nos campos dos índices simulados pelos dois forçamentos para o período histórico, verifica-se que os padrões espaciais são semelhantes apesar das diferenças na intensidade. Como as alterações climáticas dos índices são avaliadas através de diferenças, estas discrepâncias não invalidam a utilização do modelo no futuro. Posteriormente foram estudadas as alterações climáticas dos índices através da comparação entre o clima histórico e futuro. Estima-se um aumento da intensidade do CAPE e uma diminuição (aumento) da frequência de eventos com intensidade reduzida (elevada). Estas alterações são robustas no verão e outono. Também é esperado um aumento da intensidade do SHR6km na primavera e inverno tal como da frequência de SHR6km elevado nestas estações e uma redução da intensidade e da frequência de eventos com SHR6km elevado nas restantes. Haverá um possível aumento robusto da intensidade do SWEAT no verão e outono, bem como da frequência destes valores. Concluindo, será provável um aumento da frequência dos ambientes favoráveis ao desenvolvimento de tempestades, devido a uma maior intensidade e probabilidade de ocorrência de valores extremos do CAPE e do SWEAT. No entanto, a redução do SHR6km, poderá diminuir a organização das tempestades e o seu tempo de vida.