5,619 research outputs found

    Viscosity of R134a, R32, and R125 at saturation

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    This paper reports the results of the measurement of the viscosity of R134a close to the saturation line in the vapor phase. The new measurements were carried out in a vibrating-wire viscometer specially constructed for the purpose, and the results have an accuracy of ±2%. In addition, the opportunity is taken to present a reevaluation of earlier measurements along the saturation line of the viscosity of R32 and R125. Improved equations of state for these fluids are now available and can be employed to generate improved values for the viscosity

    Potential benefit for production management of a pulp and paper company from using an ft-nir analyzer

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    The pulp and paper segment has been seeking to increase mill efficiency through cost reduction and better production management. One of the ways to achieve this goal is through better control and operation of the pulp plant digester cooking. The study aimed to verify the accuracy of the FT-NIR analyzer in the liquor lines of a pulp and paper digester and its possible benefits for production management. The research methodology used was the case study, where it was analyzed and compared the results of the equipment with the values of the company's laboratory. The analysis of the instrument proved accurate and reliable, providing information on various properties of liquors that enable the optimization of production management with the stabilization of the operation. Future trends indicate that infrared technology will continue to play an important role as a detection platform due to its inherent flexibility and capability

    Optimization of the Hartmann–Shack microlens array

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    AbstractIn this work we propose to optimize the microlens-array geometry for a Hartmann–Shack wavefront sensor. The optimization makes possible that regular microlens arrays with a larger number of microlenses are replaced by arrays with fewer microlenses located at optimal sampling positions, with no increase in the reconstruction error. The goal is to propose a straightforward and widely accessible numerical method to calculate an optimized microlens array for a known aberration statistics. The optimization comprises the minimization of the wavefront reconstruction error and/or the number of necessary microlenses in the array. We numerically generate, sample and reconstruct the wavefront, and use a genetic algorithm to discover the optimal array geometry. Within an ophthalmological context, as a case study, we demonstrate that an array with only 10 suitably located microlenses can be used to produce reconstruction errors as small as those of a 36-microlens regular array. The same optimization procedure can be employed for any application where the wavefront statistics is known

    As Olimpíadas estão atualizadas? Medidas tomadas pelo COI para aumentar a igualdade de gênero nos Jogos

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    Olympism emerges as an instrument of integration that, through the Olympic values, overcomes ethnic, religious, and cultural differences in favor of a world free of discrimination, ensuring the practice of sports as a right for all. Having equality as one of its principles is foreseen in the International Olympic Committee's (IOC) Agenda 2020+5, just as it is consistent with the global movement for gender equality, as proposed in Sustainable Development Goal 5 of the United Nations' Agenda 2030. This study aims to identify the actions taken by the IOC for gender equality related to all women, athletes or non-athletes, who are part of the Olympic Games scenario. This study is documentary research, using the official documents published on the IOC website related to gender equality as a primary source of data. Through Thematic Analysis as a method of data analysis, we achieved a qualitative understanding of the documents to measure the main actions adopted by the body in favor of gender equality in the Olympic Games. As a result of this study, we seek a greater understanding of this relevant theme in the discussion of gender equality in the sports context, with a specific look at one of the main events in the area, which involves a range of sports and has tremendous impact, reaching international visibility.El olimpismo surge como un instrumento de integración que, a través de los valores olímpicos, supera las diferencias étnicas, religiosas y culturales en favor de un mundo libre de discriminación, asegurando la práctica del deporte como un derecho para todos. Tener la igualdad como uno de sus principios está previsto en la Agenda 2020+5 del Comité Olímpico Internacional (COI), ya que es coherente con el movimiento global por la igualdad de género, tal y como se propone en el Objetivo de Desarrollo Sostenible 5 de la Agenda 2030 de Naciones Unidas. Este estudio pretende identificar las acciones emprendidas por el COI en favor de la igualdad de género en relación con todas las mujeres, atletas o no atletas, que forman parte del escenario de los Juegos Olímpicos. Este estudio es una investigación documental, que utiliza como fuente primaria de datos los documentos oficiales publicados en la página web del COI relacionados con la igualdad de género. A través del Análisis Temático como método de análisis de datos, logramos una comprensión cualitativa de los documentos para medir cuáles fueron las principales acciones adoptadas por el organismo a favor de la igualdad de género en los Juegos Olímpicos. Como resultado de este estudio, buscamos una mayor comprensión de este relevante tema de la discusión sobre la igualdad de género en el contexto deportivo, con una mirada específica a uno de los principales eventos del área, que involucra una serie de modalidades y tiene un gran impacto que alcanza visibilidad internacional.O Olimpismo surge como um instrumento de integração que, através dos valores olímpicos, supera as diferenças étnicas, religiosas e culturais em favor de um mundo livre de discriminação, assegurando a prática do desporto como um direito para todos. Ter a igualdade como um dos seus princípios está previsto na Agenda 2020+5 do Comitê Olímpico Internacional (COI) tal como é coerente com o movimento global pela igualdade de gênero, conforme proposto no Objetivo 5 de Desenvolvimento Sustentável da Agenda 2030 da Organização das Nações Unidas. Este estudo visa identificar as ações tomadas pelo COI em prol da igualdade de género relacionadas com todas as mulheres, atletas ou não-atletas, que integram o cenário dos Jogos Olímpicos. Este estudo é uma pesquisa documental, utilizando os documentos oficiais publicados no website do COI relacionados com a igualdade de gênero como fonte primária de dados. Através da Análise Temática como método de análise de dados, conseguimos uma compreensão qualitativa dos documentos de forma a mensurar quais foram as principais ações adotadas pelo órgão em prol da igualdade de gênero nos Jogos Olímpicos. Como consequência deste estudo, procuramos uma maior compreensão deste relevante tema da discussão de igualdade de gênero no contexto desportivo, com um olhar específico sobre um dos principais eventos da área, que envolve uma gama de modalidades e possui grande impacto atingindo visibilidade internacional

    Choroid Plexus Papilloma in a Bitch

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    Background: Choroid plexus papilloma is a benign neoplasm derived from the neuroepithelium of the choroid plexus of the ventricular cavity, commonly located in the fourth ventricle, affecting dogs of different age groups and without predilection for sex. There is a range of therapeutic options, and the treatment to be chosen will be defined based on tumor localization and development. Due to the difficulties in accessing treatments, tutors opt for euthanasia or death occurs with the worsening of the clinical condition. This case report aims to present the symptomatology, treatment and evolution of the case until the death of the animal, as well as the pathological findings. Case: A 12-year-old bitch, mixed breed, was treated presenting behavior alteration, with unusual aggressiveness, perceived by the tutor four weeks ago. Neurological examination revealed changes in behavior, compulsive walking and focal epileptic seizures. After the presumptive diagnosis of brain neoplasia, the dog underwent symptomatic treatment with prednisolone (1 mg/kg, orally, every 24 h, for 15 days, with subsequent reduction to 0.5 mg/kg for another 15 days) and phenobarbital (3 mg/kg, every 12 h, orally), until death. After the beginning of the treatment, no more epileptic seizures and aggressive behavior were observed. After 5 months of consultation, the dog returned with aggressive and anorexic behavior. Due to the worsening of clinical signs, with the possibility of brain neoplasia, the tutor opted for euthanasia. Necropsy was performed and macroscopic examination was observed in the telecephalus, occlusion of the third ventricle by grayish mass, soft, 1.2 cm in diameter with slight dilation of lateral ventricles. On histological examination, it was observed that the third ventricle was occluded, epithelial proliferation of arboriform aspect, composed of cuboidal cells to columnares sustained by moderate fibrovascular stroma. Based on macroscopic and histopathological findings of the telecephalus, the alterations determined the diagnosis of choroid plexus papilloma. Discussion: The diagnosis of choroid plexus papilloma was confirmed by observing the neurological signs and pathological findings that characterize this neoplasm. Choroid plexus tumors are less common, in the third ventricle, only in 36% of all reports are of tumors in that area. The search for care is mainly due to clinical signs that include behavioral, and locomotor changes and sometimes epileptic seizures, such clinical signs were found in the dog. Choroid plexus papilloma affects dogs of all ages, but more in adults and increasing the occurrence as they age. The tumor is still correlated in a higher occurrence in large animals, the evaluated dog was of age, but small in size. During anamnesis, in addition to the clinical history, neurological examinations provide a good basis for the presumptive diagnosis that can be complemented by an imaging diagnosis. Sometimes such technologies are not available for use, therefore, more comprehensive knowledge about clinical signs and anamnesis are indispensable for a correct diagnosis. Palliative drug therapies are an excellent option for most cases presented in the literature and clinical routine, since they provide better quality of life by decreasing or eliminating clinical signs, besides being easily administered by tutors. The therapy proved to be of great value for the improvement of the clinical signs of the evaluated dog, confirming the importance of knowledge of the appropriate prescriptions for each case and reinforcing that consultation with one was important in defining the diagnosis and symptomatic treatment. Keywords: dog, neurology, tumor, benign, choroid plexus. Título: Papiloma de plexo coronoide em uma cadela. Descritores: cão, neurologia, tumor, benigno, plexo coroide

    Validity Evidence for the Turnover and Attachment Motives Survey (TAMS) in a Brazilian Sample

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    O turnover de profissionais tornou-se preocupação crescente de pesquisas organizacionais, gerando muitos modelos preditivos no mundo todo. Um modelo promissor é o Inventário de Motivos para Retenção e Turnover (TAMS). Este estudo buscou adaptar e validar o TAMS para o contexto organizacional brasileiro, e verificar se a afirmação sobre a universalidade desse modelo se mantém. Foram participantes 523 profissionais brasileiros, predominantemente homens (57,7%), de diferentes níveis hierárquicos e empresas, com idades entre 24 e 54 anos (M = 34,2, DP = 7,17). Os resultados forneceram evidências de consistência interna e validade convergente, divergente, e preditiva, apontando a TAMS como ferramenta que permite compreender e gerir mais adequadamente a intenção de rotatividade e seus antecedentes. Apesar de ser uma medida promissora, os resultados apontam a necessidade de, em estudos futuros, investigar e adequar algumas das subescalas da TAMS, especialmente forças normativas e constituintes, para que sejam mais representativas do contexto brasileiro.El turnover de profesionales se ha convertido en preocupación creciente de investigaciones organizacionales, generando muchos modelos predictivos por el mundo. Un modelo prometedor es el Inventario de Motivos para Retención y Turnover (TAMS). Este estudio buscó adaptar y validar el TAMS para el contexto organizacional brasileño, y verificar si la afirmación acerca de la universalidad de este modelo sigue siendo verdadera. Participaron 523 profesionales brasileños, predominantemente hombres (57,7%) en diferentes posiciones y empresas, con edades entre 24 y 54 años (M = 34,2, DE = 7,17). Los resultados evidencian la consistencia interna, validez convergente, divergente y predictiva, señalando el TAMS como inventario capaz de comprender y gestionar mejor la intención de rotatividad y sus antecedentes. A pesar de una medida prometedora, nuestros resultados muestran la necesidad de, en estudios futuros, investigar y mejorar algunas de las subescalas de TAMS, especialmente fuerzas normativas y constituyentes, para que sean más representativas de la realidad brasileña.Staff turnover has become a growing concern of organizational research, yelding many predictive models worldwide. One promising model is the Turnover and Attachment Motives Survey (TAMS). This study aimed to adapt and validate the TAMS to the Brazilian organizational context, and ensure that the universality claim of the theory remains true. Participants were 523 Brazilian professionals occupying a range of positions in diverse companies. Their ages ranged between 24 and 54 years (M = 34.2, SD = 7.17), and they were predominantly men (57.7%). Results provided evidence of internal consistency, convergent, divergent, and predictive validity, advocating on behalf of TAMS as a tool for more adequately understanding and managing turnover intention and its antecedents among employees. Despite being a promising measure, we suggest the necessity for further investigation and improvement, in future studies, of some of TAMS' subscales, such as normative and constituent forces

    Dynamics of the sol-gel transition in organic-inorganic nanocomposites

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    Two different techniques have been used to follow the gelation of photochromic organic-inorganic nanocomposites. The variations of molecular and macromolecular motions in these complex systems have been analyzed. Photo-correlation spectroscopy probes the formation of the gel network. Forced Rayleigh scattering experiences the microstructure of the mixtures via the measurement of the translational diffusion coefficient of entrapped photoreactive targets. In the different mixtures, a drop of the network mobility could be observed around the sol to gel conversion, while the entrapped molecules do not experience the macroscopic transition

    Photochromic organic-inorganic nanocomposites as holograpahic storage media

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    This paper describes the properties of some new organic-inorganic photochromic layers. They are based on a hybrid organic-inorganic matrix in which tungsten heteropolyoxometallates (SiW12O404-, PW12O403-) are entrapped in a network obtained from the reaction of 3-glycidoxy-propyltrimethoxysilane. The high homogeneity of these materials on the nanoscale leads to transparent monoliths and layers of controlled thicknesses up to 40 µm. The optical properties of the blend are emphasised and the construction of amplitude gratings in the materials by two-wave-mixing experiments is described. The results of the optical experiments and the comparison with the theoretical background are used as a model for photochromic holographic storage processes

    Qualidade dos recursos hídricos subterrâneos na Bacia do Rio Urussanga, SC

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    Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Filosofia e Ciências Humanas. Programa de Pós-Graduação em Geografia.A escassez qualitativa de água constitui-se numa realidade preocupante no mundo. Os aqüíferos são importantes reservas estratégicas que devem ter seu uso prescrito após estudos e recomendações. Localizada no sul do estado de Santa Catarina, a Bacia do Rio Urussanga pertence à vertente atlântica compreendendo 580 Km2, nos quais se apresentam diversos usos dos recursos hídricos. Com o objetivo de analisar a qualidade das águas subterrâneas da bacia, e sua possível interface com as águas superficiais, a fim de caracterizar os impactos das atividades econômicas sobre os recursos hídricos, analisaram-se propriedades geoquímicas destas águas, a espacialização dos poços e suas relações com a Geologia e Geomorfologia. Numa campanha amostral de 30 pontos de coleta de água subterrânea analisou-se a carga iônica de nove variáveis: cálcio, potássio, sódio, cloreto, sulfatos, magnésio, manganês, ferro, alumínio além do pH, condutividade elétrica e alcalinidade total. As águas provêm de poços tubulares, poços escavados, ponteiras e fontes ou nascentes, denotando a captação em diferentes intervalos aqüíferos. Utilizando-se de softwares estatísticos, como o Multi-Variate Statistical Package e o Statistica, elaboraram-se gráficos euclidianos bidimensionais, para uma análise de componentes principais (ACP) e dendogramas resultantes de agrupamentos. Desta forma, buscou-se caracterizar a assinatura hidroquímica destas águas pelos diagramas ternários de Piper, semi-logarítimos de Schoeller e horizontais de Stiff. O cruzamento das análises permitiu concluir que as águas de aqüífero profundo são bicarbonatadas sódicas e as do aqüífero freático são cloretadas sódicas. A síntese dos resultados hidroquímicos e estatísticos permitiu a construção de mapa hidroquímico da bacia
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