Empenhamento organizacional dos enfermeiros num hospital de Portugal: análise do impacto da reestruturação organizacional

A reestruturação organizacional tem, muitas vezes, impacto no comportamento dos colaboradores. O estudo é, sobretudo, de natureza exploratória, com abordagem predominantemente quantitativa, descritiva e correlacional, tendo como objetivos avaliar o impacto do processo de reestruturação nos níveis de mpenhamento organizacional dos enfermeiros; avaliar se existe diferença entre esses níveis antes e após o processo de reestruturação; fornecer algumas recomendações e / ou sugestões, com o intuito de reforçar o empenhamento organizacional. O instrumento de coleta de dados utilizado foi o questionário, aplicado em 2011. A amostra é constituída por 158 enfermeiros que vivenciaram o processo de eestruturação organizacional e, assim, emitem opinião sobre alterações nas relações com a instituição. A informação fornecida sobre as mudanças no hospital e sobre o modo como essas mudanças poderiam afetar foi considerada insuficiente por uma percentagem considerável dos participantes. É notória a diminuição das relações afetivas e normativas dos enfermeiros com a organização

Análise experimental e numérica do comportamento de estruturas de solo reforçado com geossintéticos : solo granular versus fino

As estruturas de solo reforçado com geossintéticos são normalmente constituídas por solos granulares com boas propriedades físicas e mecânicas. O uso de apenas este tipo de solos pode proporcionar o aumento, por vezes insustentável, do custo da execução das estruturas e o aumento do seu impacto ambiental. Deste modo, as estruturas de solo reforçado perdem a sua vantagem competitiva em relação a outros tipos de estruturas (muros de betão, muros de gravidade, muros de gabiões, etc.). Para resolver este problema podem ser utilizados outros tipos de solos (solos locais, finos, com propriedades físicas e mecânicas piores mas, no entanto, mais baratos) para a execução deste tipo de estruturas. De forma geral, com este estudo pretendeu-se contribuir para o incremento do conhecimento sobre a utilização de solos finos para a construção de estruturas de solo reforçado (muros e taludes). Para tal avaliaram-se as diferenças no comportamento mecânico dos materiais compósitos (solo granular reforçado versus solo fino reforçado) e das estruturas de solo reforçado constituídas com os dois tipos de solos. Assim, os objetivos deste estudo foram avaliar: a influência de vários parâmetros nas propriedades mecânicas e na capacidade de carga dos solos reforçados com geossintéticos; a influência de vários parâmetros no dimensionamento das estruturas de solo reforçado; e o comportamento das estruturas dimensionadas (incluindo a estabilidade global e a influência do processo construtivo) recorrendo a uma ferramenta numérica (PLAXIS). Para cumprir os objetivos propostos foram realizadas análises experimentais em laboratório (análise do comportamento do solo reforçado através de ensaios triaxiais e de California Bearing Ratio) e análises numéricas (dimensionamento de estruturas de solo reforçado; modelação numérica do comportamento através de uma ferramenta numérica comercial com o método dos elementos finitos). Os resultados dos ensaios experimentais mostraram que o comportamento mecânico e a capacidade de carga do solo foram incrementados com a inclusão das camadas de geossintético. Este efeito variou com os diversos parâmetros analisados mas, de forma geral, foi mais importante no solo fino (solo com propriedades mecânicas piores). As análises numéricas mostraram que as estruturas de solo fino precisaram de maior densidade de reforços para serem estáveis. Além disso, as estruturas de solo fino foram mais deformáveis e o efeito do seu processo construtivo foi mais importante (principalmente para estruturas de solo fino saturado).

Destino no ambiente e comportamento agronômico de atrazina em resposta a doses e níveis de palha de espécies de cobertura de solo

The use of cover crops is a fundamental strategy to the weed management in Southern Brazil. In highly infested areas, the herbicides use is increasing, which increases the costs of the crops production as well as the environmental contamination. Oat and velvet bean plants havecontrasting characteristics regarding to residues decomposition speed and the capacity to immobilize Nitrogen in the soil, providing distinct results of weeds suppression throughout the time, and therefore, requiring distinct management strategies before, during, and after the corn crop establishment. The general objective of the experiment was to evaluate the environmental dynamics of the herbicide atrazine, the corn grain yield, and the efficiency of the weed control, considering areas with distinct history regarding the use of mulching, levels of straw and rates of atrazine. For this, the experiment was carried out in two parts: in the first part, two trials with the corn crop were established, one using oat and the other using velvet bean as cover crops. The experimental design used for both field trials was randomized complete blocks arrangement with four replications. The factor A was constituted by four levels of straw (0; 0.75x; 1.5x; 3x) and the factor B was constituted by four rates of the herbicide atrazine (0; 2100; 4200; 8400 g a i. ha-1). Soil samples were collected for greenhouse trialsto determine the persistence. Atrazine leaching evaluation was performed by chromatography using samples collected over the soil profile.In the field, the weed density, the fresh and dry weight and the yield of the corn were evaluated. In the greenhouse trials, the main variables evaluated were plant height and injury caused by the herbicide toxicity. In the second part, soils with distinct covering history were sampled, and the mineralization and sorption studies, both with 14C-atrazine, were conducted in the laboratory. The experimental design was randomized complete blocks arrangement with four replications. The results from the field experiment show that the high levels of straw above ground, isolated, were not efficient to control completely the weeds, and that high levels of velvet bean`s straw decreased the corn potential yield. The greenhouse trials showed that high levels of oat straw prevent the scape of atrazine to soil, this effect of oat straw upon the herbicide availability on soil was detected up to 12 days after spraying. The half-life of atrazine sprayed over oat straw varied from 7 to 14 days after spraying, while the half-life of atrazine sprayed over velvet bean varied from 5 to 14 days after spraying. Increasing oat straw levels presents the capacity to reduce the lixiviation of atrazine in the soil profile, however, this effect was not verified when using velvet bean straw, because the herbicide was not detected in the soil profile, at 21 days after spraying. The chromatographic analysis indicate thatthe atrazine concentrates closer to the soil surface regardless of amount of straw, not being detected deeper than 8 cm in the soil. The accumulated mineralization of 14C-arazine sprayed over V. sativa is superior if compared to soils with S. cereale or non-covered soils. The sorption coefficient of atrazine is superior when sprayed over straw than over the soil.

Caracterização dos grupos de pesquisa em inteligência organizacional competitiva

Os grupos de pesquisa são responsáveis pela investigação de temáticas relevantes no âmbito científico, pois conduzem o debate e acirram o saber-fazer, contribuindo, sobremaneira, para a construção de conhecimentos. O objetivo geral da pesquisa é caracterizar os grupos de pesquisa sobre inteligência organizacional quanto aos aspectos gerais, institucionais, recursos humanos e especialidades do conhecimento que o constituem. Metodologicamente, quanto à natureza é considerada como abordagem quantitativa e qualitativa, e como estudo do tipo documental desenvolvido no ambiente da web. Os documentos de formato eletrônico analisados correspondem aos cadastros dos grupos de pesquisa sobre inteligência organizacional e competitiva no campo da Ciência da Informação, escolhidos pelo critério de busca por descritores, caracterizando a amostra como intencional. Trata-se de um estudo de nível exploratório-descritivo. Como resultados, identificam na recuperação parametrizada 13 grupos, que trabalham com o tema em questão, na sua maioria se concentram na região Sudeste e demonstram a importância e o envolvimento de pessoas na busca por resultados que possibilitem inovações tecnológicas e informacionais. As linhas de pesquisas, embora se diferenciem, algumas apresentam termos estudados bastante semelhantes entre os grupos. Foram recuperadas 62 linhas desenvolvidas pelos grupos com temas semelhantes e percebe-se positivamente uma preocupação dos pesquisadores envolvidos em como potencializar e desenvolver um ambiente competitivo e identificar os recursos informacionais dentro de uma organização. Produzir artigos, participação em eventos, dissertações e teses, livros e outras produções fazem parte das expectativas dos grupos. Em relação à formação de competências, os grupos pretendem ministrar cursos, promover extensão integrada, desenvolver instrumentos de recuperação da informação, realizar estudos prospectivos nas organizações, fortalecer laboratórios, fortalecer a pesquisa, organizar eventos, desenvolver produtos e serviços e discutir a teoria e a prática de Inteligência Competitiva.

Comportamento informacional e avaliação de serviços bibliotecários

Estudo sobre o comportamento informacional dos servidores técnico-especializados do Tribunal de Contas dos Municípios do Estado de Goiás, de forma a identificar suas necessidades, seus hábitos de busca e formas de utilização das informações nas atividades diárias realizadas na Instituição e, ao mesmo tempo, avaliar os serviços prestados pela biblioteca. Apresenta conceitos básicos relacionados a estudos de usuários e comportamento informacional, passando pelas abordagens tradicional e alternativa. Foi utilizado o modelo conceitual de comportamento informacional de Wilson (1981). Trata-se de uma pesquisa qualitativa, de caráter exploratório. Como instrumento de coleta de dados utilizou-se o questionário autoadministrado. Os resultados da pesquisa mostram que as necessidades de informação desses profissionais decorrem de seu trabalho na Instituição e que a busca por informações se dá em diferentes fontes, com a finalidade principal de formação e atualização profissional e para o desempenho de suas atividades profissionais. Os produtos e serviços da Biblioteca da instituição mostraram-se adequados, porém há necessidade de mais divulgação e desenvolvimento de sistemas informatizados para recuperação das informações

Modelo de gestão do conhecimento para a unidade organizacional de saúde

Nos últimos anos têm surgido vários debates e estudos sobre a importância do conhecimento. As organizações consideram a Gestão do Conhecimento (GC) uma vantagem competitiva, capaz de gerar riqueza e poder. Para tal necessitam de desenvolver mecanismos e de ter pessoas com capacidade de criar, compartilhar e disseminar conhecimentos na organização. As Tecnologias de Informação e os Sistemas de Informação são uma ferramenta de grande impacto na GC, pois assumem um papel importante no sucesso e na renovação dos conhecimentos. A partir do Modelo de GC desenvolvido por Nonaka e Takeuchi, o Modelo Metavisão, e as técnicas de Business lntelligence, elaborou-se um Modelo de Gestão do conhecimento para a Unidade de Saúde. Com este modelo pretende-se obter beneficies, que passam pelo desenvolvimento de mecanismos de comunicação interna, formação e melhorias no processo de tomada de decisão. ABSTRACT; During the last years, debates and studies have arisen in relation to the importance of knowledge. The organizations consider Knowledge Management a competitive advantage, capable of generating wealth and power. Therefore, new mechanisms have to be developed in the organizations and employ people with capacity to create, share and disseminate knowledge. The information and Communication Technology is an important tool and has a great impact on Knowledge Management because it assumes an important role in the success and the renovation of knowledge. The Model of Knowledge Management developed by Nonaka and Takeuchi, the "Metavision" Model and the techniques of Business intelligence were the starting point to elaborate a Model of Knowledge Management for a Health Unit. With this model we aim to obtain benefits, such as development of mechanisms of internal communication, training plans and improvement during the process of decision making.

A confiança interorganizacional nas compras

This research is part of the field of organizational studies, focusing on organizational purchase behavior and, specifically, trust interorganizational at the purchases. This topic is current and relevant by addressing the development of good relations between buyer-supplier that increases the exchange of information, increases the length of relationship, reduces the hierarchical controls and improves performance. Furthermore, although there is a vast literature on trust, the scientific work that deal specifically at the trust interorganizational still need further research to synthesize and validate the variables that generate this phenomenon. In this sense, this investigation is to explain the antecedents of trust interorganizational by the relationship between the variable operational performance, organizational characteristics, shared values and interpersonal relationships on purchases by manufacturing industries, in order to develop a robust literature, most consensual, that includes the current sociological and economic, considering the effect of interpersonal relationships in this phenomenon. This proposal is configured in a new vision of the antecedents of interorganizational trust, described as significant quantitative from models Morgan and Hunt (1994), Doney and Cannon (1997), Zhao and Cavusgil (2006) and Nyaga, Whipple, Lynch (2011), as well as qualitative analysis of Tacconi et al. (2011). With regard to methodological aspects, the study assumes the form of a descriptive, survey type, and causal trace theoretical and empirical. As for his nature, the investigation, explicative character, has developed a quantitative approach with the use of exploratory factor analysis and structural equation modeling SEM, with the use of IBM software SPSS Amos 18.0, using the method of maximum verisimilitude, and supported by technical bootstraping. The unit of analysis was the buyer-supplier relationship, in which the object under investigation was the supplier organization in view of the purchasing company. 237 valid questionnaires were collected among key informants, using a simple random sampling developed in manufacturing industries (SIC 10-33), located in the city of Natal and in the region of Natal. The first results of descriptive analysis demonstrate the phenomenon of interorganizational trust, in which purchasing firms believe, feel secure about the supplier. This demonstration showed high levels of intensity, predominantly among the vendors that supply the company with materials that are used directly in the production process. The exploratory and confirmatory factor analysis, performed on each variable alone, generated a set of observable and unobservable variables more consistent, giving rise to a model, that needed to be further specified. This again specify model consists of trajectories was positive, with a good fit, with a composite reliability and variance extracted satisfactory, and demonstrates convergent and discriminant validity, in which the factor loadings are significant and strong explanatory power. Given the findings that reinforce the model again specify data, suggesting a high probability that this model may be more suited for the study population, the results support the explanation that interorganizational trust depends on purchases directly from interpersonal relationships, sharing value and operating performance and indirectly of personal relationships, social networks, organizational characteristics, physical and relational aspect of performance. It is concluded that this trust can be explained by a set of interactions between these three determinants, where the focus is on interpersonal relationships, with the largest path coefficient for the factor under study

Comportamento legislativo e gasto público : as respostas distributivistas ao problema do common pool

Analisa um aspecto específico da teoria distributivista dos estudos legislativos, tal como apresentada originalmente a partir de David Mayhew: a tendência a gerar gastos fiscais subótimos (superiores ao custo total dos impostos utilizados para financiá-los).

Optimização do desenvolvimento organizacional: Liderança e entrega como premissas chaves?

Dissertação de Mestrado apresentada ao Instituto Superior de Psicologia Aplicada para obtenção de grau de Mestre na especialidade de Psicologia Social e das Organizações.

Comportamento do consumidor: um estudo do mercado imobiliário em condomínios verticais fechados na região metropolitana de Natal

The research in question looked for to establish the relation between the motivation (of the proprietor of apartment) to change itself of another one apartment, in closed vertical condominium (residential mobility) in the period of the recognition of the necessity, and the satisfaction with the apartment after consume. The universe or the population chosen for the development of the study was of proprietors of apartment in vertical condominiums located in the region metropolitan of Natal. The analysis of data was made using the techniques of linear regression and logistic regression between variables. The linear regression found relations between the motivations for housing change and the satisfaction in after consume with some attributes of the apartment. The logistic regression showed that relations between the motivations for change and the general satisfaction to the apartment exist as a whole, in the period after consumes. With regard to the motivation to change itself of a apartment for another one, some reasons shown more motivation them the others. The research found different degrees of satisfaction with certain characteristics of the apartment and degrees of no satisfaction with others. Finally the results of the research had contributed for the reply of the problem that guided the present study, therefore had obtained in such a way to find how much logistic not linear relations between the two periods purchase (recognition of the necessity and evaluation after consume) and had elucidated the process that goes since the choice the product until the satisfaction of the necessities

Os sistemas integrados de gestão na Administração Pública : Estratégias de desenvolvimento e reorientação organizacional. Estudo de um caso

Os Organismos públicos encontram-se, actualmente, a desenvolver estudos a nível dos Sistemas Integrados de Gestão, motivados pela necessidade que existe em adoptar novas técnicas de Gestão capazes de responder às novas exigências de informação. Em termos gerais, os Organismos públicos encontram-se numa fase de viragem na sua actuação, em que surge a necessidade de dispor de novos sistemas de informação capazes de dar resposta às exigências da Nova Gestão Pública. É certo que a Nova Gestão Pública conduz a uma maior motivação, proporcionando uma melhoria na obtenção dos resultados e modernizando a relação entre o controlo das despesas públicas e a prestação de contas a nível dos órgãos do Estado, e onde a uniformização de critérios se apresenta como um dos principais requisitos para criar condições de implementação de uma contabilidade pública que funcione como instrumento de apoio aos utilizadores da informação e, em particular, aos Órgãos de Chefia e Direcção. Este trabalho analisa o caso do Exército Português, como exemplo de um Organismo público que aproveitou a obrigatoriedade de adesão ao novo Regime de Administração Financeira do Estado, para promover a implementação de um Sistema Integrado de Gestão capaz de responder às novas exigências de informação. Analisam-se também as estratégias de actuação e reorientação organizacional utilizadas pelo Exército Português, de modo a permitir o desenvolvimento e implementação do sistema baseado na uniformização de critérios que garanta os requisitos e as técnicas de Gestão capazes de criar condições para desenvolver uma contabilidade pública que funcione como instrumento de apoio à decisão. ABSTRACT; At present, government entities are developing studies at an Integrated Management System level, impelled by the actual need of adopting new Management techniques capable of responding to the new demands regarding Information. ln global terms, government entities are reaching a turning point in its way of acting, due to the arising need of settling new information systems which provide an answer to the demands of the New Public Management. It is assured that the New Public Management leads to a higher motivation, providing an improvement in accomplishing results and modernizing the link between the control of public expenditure and presenting accounts of State Organs. It also presents the criteria standards as one of the main requirements to create implementation conditions of a public accounting which operates as a support mean to the information users and, more specifically, to the Command and Boarding Bodies. This study analyses the Portuguese Army, an example of government entity which seized the obligation of joining the New Public Financial Management Regime to promote the implementation of an Integrated Management System capable of responding to the new information demands. The performing strategies and organizational refocus used by the Portuguese Army are also analyzed in order to allow the development and implementation of the system. It is based in the standard criteria that secure the requirements and Management techniques which enable the progress of a public accounting acting as a support resource in decision-making.

Previsão do índice bovespa por meio de redes neurais artificiais: uma análise comparada aos métodos tradicionais de séries de tempo

Forecast is the basis for making strategic, tactical and operational business decisions. In financial economics, several techniques have been used to predict the behavior of assets over the past decades.Thus, there are several methods to assist in the task of time series forecasting, however, conventional modeling techniques such as statistical models and those based on theoretical mathematical models have produced unsatisfactory predictions, increasing the number of studies in more advanced methods of prediction. Among these, the Artificial Neural Networks (ANN) are a relatively new and promising method for predicting business that shows a technique that has caused much interest in the financial environment and has been used successfully in a wide variety of financial modeling systems applications, in many cases proving its superiority over the statistical models ARIMA-GARCH. In this context, this study aimed to examine whether the ANNs are a more appropriate method for predicting the behavior of Indices in Capital Markets than the traditional methods of time series analysis. For this purpose we developed an quantitative study, from financial economic indices, and developed two models of RNA-type feedfoward supervised learning, whose structures consisted of 20 data in the input layer, 90 neurons in one hidden layer and one given as the output layer (Ibovespa). These models used backpropagation, an input activation function based on the tangent sigmoid and a linear output function. Since the aim of analyzing the adherence of the Method of Artificial Neural Networks to carry out predictions of the Ibovespa, we chose to perform this analysis by comparing results between this and Time Series Predictive Model GARCH, developing a GARCH model (1.1).Once applied both methods (ANN and GARCH) we conducted the results' analysis by comparing the results of the forecast with the historical data and by studying the forecast errors by the MSE, RMSE, MAE, Standard Deviation, the Theil's U and forecasting encompassing tests. It was found that the models developed by means of ANNs had lower MSE, RMSE and MAE than the GARCH (1,1) model and Theil U test indicated that the three models have smaller errors than those of a naïve forecast. Although the ANN based on returns have lower precision indicator values than those of ANN based on prices, the forecast encompassing test rejected the hypothesis that this model is better than that, indicating that the ANN models have a similar level of accuracy . It was concluded that for the data series studied the ANN models show a more appropriate Ibovespa forecasting than the traditional models of time series, represented by the GARCH model

Análise da sobre-reação e sub-reação nos ativos de primeira e segunda linha do mercado acionário brasileiro

The Behavioral Finance develop as it is perceived anomalies in these markets efficient. This fields of study can be grouped into three major groups: heuristic bias, tying the shape and inefficient markets. The present study focuses on issues concerning the heuristics of representativeness and anchoring. This study aimed to identify the then under-reaction and over-reaction, as well as the existence of symmetry in the active first and second line of the Brazilian stock market. For this, it will be use the Fuzzy Logic and the indicators that classify groups studied from the Discriminant Analysis. The highest present, indicator in the period studied, was the Liabilities / Equity, demonstrating the importance of the moment to discriminate the assets to be considered "winners" and "losers." Note that in the MLCX biases over-reaction is concentrated in the period of financial crisis, and in the remaining periods of statistically significant biases, are obtained by sub-reactions. The latter would be in times of moderate levels of uncertainty. In the Small Caps the behavioral responses in 2005 and 2007 occur in reverse to those observed in the Mid-Large Cap. Now in times of crisis would have a marked conservatism while near the end of trading on the Bovespa speaker, accompanied by an increase of negotiations, there is an overreaction by investors. The other heuristics in SMLL occurred at the end of the period studied, this being a under-reaction and the other a over-reaction and the second occurring in a period of financial-economic more positive than the first. As regards the under / over-reactivity in both types, there is detected a predominance of either, which probably be different in the context in MLCX without crisis. For the period in which such phenomena occur in a statistically significant to note that, in most cases, such phenomena occur during the periods for MLCX while in SMLL not only biases are less present as there is no concentration of these at any time . Given the above, it is believed that while detecting the presence of bias behavior at certain times, these do not tend to appear to a specific type or heuristics and while there were some indications of a seasonal pattern in Mid- Large Caps, the same behavior does not seem to be repeated in Small Caps. The tests would then suggest that momentary failures in the Efficient Market Hypothesis when tested in semistrong form as stated by Behavioral Finance. This result confirms the theory by stating that not only rationality, but also human irrationality, is limited because it would act rationally in many circumstances

Estudo do comportamento biomecânico de aneurismas cerebrais

Os aneurismas cerebrais são dilatações patológicas das artérias cerebrais e são conhecidos como um dos eventos cerebrovasculares mais comuns e graves. A maioria dos aneurismas cerebrais não provocam sintomas até que se tornem grandes, começando a vazar sangue ou a romperem-se. O principal objetivo deste trabalho é a caracterização do comportamento biomecânico de aneurismas, tendo em consideração diferentes parâmetros geométricos e fisiológicos, de forma a analisar o comportamento da parede de um vaso sanguíneo aquando a formação de um aneurisma. O estudo numérico foi efetuado considerando diferentes modelos constitutivos híper-elásticos, que é o caso dos vasos sanguíneos, com intuito de verificar qual o que melhor se adequa a este tipo de estudos e de analisar e calcular os deslocamentos e as deformações ocorridas no aneurisma cerebral. Os diferentes modelos constitutivos foram aproximados por uma curva de tensão/deformação que contém valores experimentais de um ensaio de tração até à rutura de uma mucosa vaginal. Foram utilizados dois módulos do software Ansys®, sendo estes o Fluent e o Static Structural. O primeiro utilizou-se determinar a pressão exercida pelo fluido na parede interior do canal, sendo este resultado exportado para o Static Structural, permitindo assim fazer o estudo estrutural do canal com aneurisma. Concluiu-se que a nível qualitativo, qualquer modelo constitutivo estudado pode ser utilizado, pois todos mostram o mesmo tipo de distribuição de deslocamentos e deformações. No entanto, os modelos mais fiáveis a nível quantitativo é o modelo de Mooney-Rivlin 5 Parameter e o Polynomial 2nd Order, pois apresentam os mesmos resultados.

Estudos de Durabilidade Frente ao Ataque Ácido de Compósitos Portland-Polímero para Cimentação de Poços de Petróleo

Portland-polymers composites are promising candidates to be used as cementing material in Northeastern oil wells of Brazil containing heavy oils submitted to steam injection. In this way, it is necessary to evaluate its degradation in the commonly acidizind agents. In addition, to identify how aggressive are the different hostile environments it is an important contribution on the decision of the acidic systems to be used in. It was investigated the performance of the Portland-polymer composites using powdered polyurethane, aqueous polyurethane, rubber tire residues and a biopolymer, those were reinforced with polished carbon steel SAE 1045 to make the electrochemical measurements. HCl 15,0 %, HCl 6,0 % + HF 1,5 % (soft mud acid), HCl 12,0 % + HF 3,0 % (regular mud acid) and HAc 10 % + HF 1,5 % were used as degrading environment and electrolytes. The more aggressive acid solution to the plain Portland hardened cement paste was the regular mud acid, that showed loss of weight around 23.0 %, followed by the soft mud acid, the showed 11.0 %, 15.0 % HCl with 7,0 % and, at last the 10.0 % HAc plus HF 1.5 % with just 1.0 %. The powdered polyurethane-composite and the aqueous polyurethane one showed larger durability, with reduction around 87.0 % on the loss of weight in regular mud acid. The acid attack is superficial and it occurs as an action layer, where the degraded layer is responsible for the decrease on the kinetic of the degrading process. This behavior can be seen mainly on the Portland- aqueous polyurethane composite, because the degraded layer is impregnated with chemically modified polymer. The fact of the acid attack does not have influence on the compressive strength or fratography of the samples, in a general way, confirms that theory. The mechanism of the efficiency of the Portland-polymers composites subjected to acid attack is due to decreased porosity and permeability related with the plain Portland paste, minor quantity of Ca+2, element preferentially leached to the acidic solution, wave effect and to substitute part of the degrading bulk for the polymeric one. The electrolyte HAc 10 % + HF 1,5 % was the least aggressive one to the external corrosion of the casing, showing open circuit potentials around +250 mV compared to -130 mV to the simulated pore solution to the first 24 hours immersion. This behavior has been performed for two months at least. Similar corrosion rates were showed between both of the electrolytes, around 0.01 μA.cm-2. Total impedance values, insipient arcs and big polarization resistance capacitive arcs on the Nyquist plots, indicating passivity process, confirm its efficiency. In this way, Portlandpolymers composites are possible solutions to be succeed applied to oilwell cementing concomitant submitted to steam injection and acidizing operation and the HAc 10,0 % + HF 1,5 % is the less aggressive solution to the external corrosion of the casing