931 resultados para [JEL:C20] Mathematical and Quantitative Methods - Econometric Methods: Single Equation Models


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"Agricultural Research Service ... in cooperation with Arizona and Texas Agricultural Experiment Stations."

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Mode of access: Internet.

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No more published after 1892/93(?)

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Different factors have been shown to influence the development of models of advanced nursing practice (ANP) in primary-care settings. Although ANP is being developed in hospitals in Hong Kong, China, it remains undeveloped in primary care and little is known about the factors determining the development of such a model. The aims of the present study were to investigate the contribution of different models of nursing practice to the care provided in primary-care settings in Hong Kong, and to examine the determinants influencing the development of a model of ANP in such settings. A multiple case study design was selected using both qualitative and quantitative methods of data collection. Sampling methods reflected the population groups and stage of the case study. Sampling included a total population of 41 nurses from whom a secondary volunteer sample was drawn for face-to-face interviews. In each case study, a convenience sample of 70 patients were recruited, from whom 10 were selected purposively for a semi-structured telephone interview. An opportunistic sample of healthcare professionals was also selected. The within-case and cross-case analysis demonstrated four major determinants influencing the development of ANP: (1) current models of nursing practice; (2) the use of skills mix; (3) the perceived contribution of ANP to patient care; and (4) patients' expectations of care. The level of autonomy of individual nurses was considered particularly important. These determinants were used to develop a model of ANP for a primary-care setting. In conclusion, although the findings highlight the complexity determining the development and implementation of ANP in primary care, the proposed model suggests that definitions of advanced practice are appropriate to a range of practice models and cultural settings. However, the findings highlight the importance of assessing the effectiveness of such models in terms of cost and long-term patient outcomes.

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We would like to reply to the comments made by Paparazzo on our recent paper [1] on theeffect of curve fitting parameters on quantitative analysis of Fe0.94O and Fe2O3 using XPS”. There have been many studies on the characterisation of the properties of iron oxide surfaces. The main purpose of writing the paper was to demonstrate the extent to which the selection of input parameters for curve fitting can affect the results of the quantitative analysis, and to use this analysis to develop more consistent, reproducible and quantitative methods of analysis of these data.

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A gestão de pessoas é um elemento estratégico nas organizações. Dentre as estratégias que podem ser adotadas pela gestão de pessoas, o monitoramento do clima organizacional vem sendo foco nas organizações. No mundo competitivo, as incubadoras de empresas surgem, com o objetivo de proporcionar aos novos empreendimentos, meios para que tenham condições de expandir, auxiliando no desenvolvimento econômico local e regional. O presente estudo objetivou analisar o clima organizacional de três empresas do projeto incubadora de uma cidade do interior do estado de São Paulo e, verificar os impactos que o clima presente está causando nestes empreendimentos. O critério utilizado para a seleção das empresas foi o de graduação, isto é, foram escolhidas empresas com mais tempo de incubadora e que estarão prontas para deixar o projeto no final do ano de 2014. Este estudo valeu-se de métodos qualitativos e quantitativos para poder efetuar o processo metodológico e construir a análise final da pesquisa. Como método quantitativo foi utilizada uma Escala de Clima Organizacional construída e validada por Martins et al. (2004) e como método qualitativo foi realizada uma entrevista com funcionários e gestores das empresas estudadas, com o objetivo de coletar informações para auxiliar no estudo, proporcionar melhor compreensão do ambiente de trabalho e verificar quais os principais impactos causados pelo clima presente. Percebeu-se que, as empresas estudadas, apresentam sérios problemas em seu ambiente de trabalho e, por sua vez, este clima organizacional vem impactando em outras variáveis como, nível de estresse, rotatividade de profissionais, desempenho profissional e na lucratividade destas organizações.

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Este estudo tem como objetivo propor uma análise do modo como se constrói a representação da imagem eleitoral de João Goulart, sob a ótica da propaganda política no cinema brasileiro no período pós-ditadura. Para a realização desse objetivo contamos com o longa-metragem de Silvio Tendler de 1984, intitulado Jango. Cremos que este estudo se justifica por contribuir para identificar, compreender e mapear o imaginário da sociedade brasileira sobre João Goulart. Para o desenvolvimento do tema foram analisadas teorias de marketing político, propaganda ideológica e persuasão. A pesquisa foi norteada pelo método qualitativo e aplicadas as técnicas de pesquisa histórica e estudo de caso. Concluímos que o Filme de Silvio Tendler reconstruiu a imagem de João Goulart ressaltando seu papel na luta pelas reformas de base. A mistificação de Jango foi exposta no documentário expositivo.

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This thesis presents theoretical investigation of three topics concerned with nonlinear optical pulse propagation in optical fibres. The techniques used are mathematical analysis and numerical modelling. Firstly, dispersion-managed (DM) solitons in fibre lines employing a weak dispersion map are analysed by means of a perturbation approach. In the case of small dispersion map strengths the average pulse dynamics is described by a perturbation approach (NLS) equation. Applying a perturbation theory, based on the Inverse Scattering Transform method, an analytic expression for the envelope of the DM soliton is derived. This expression correctly predicts the power enhancement arising from the dispersion management.Secondly, autosoliton transmission in DM fibre systems with periodical in-line deployment of nonlinear optical loop mirrors (NOLMs) is investigated. The use of in-line NOLMs is addressed as a general technique for all-optical passive 2R regeneration of return-to-zero data in high speed transmission system with strong dispersion management. By system optimisation, the feasibility of ultra-long single-channel and wavelength-division multiplexed data transmission at bit-rates ³ 40 Gbit s-1 in standard fibre-based systems is demonstrated. The tolerance limits of the results are defined.Thirdly, solutions of the NLS equation with gain and normal dispersion, that describes optical pulse propagation in an amplifying medium, are examined. A self-similar parabolic solution in the energy-containing core of the pulse is matched through Painlevé functions to the linear low-amplitude tails. The analysis provides a full description of the features of high-power pulses generated in an amplifying medium.

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A dry matrix application for matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI MSI) was used to profile the distribution of 4-bromophenyl-1,4-diazabicyclo(3.2.2)nonane-4-carboxylate, monohydrochloride (BDNC, SSR180711) in rat brain tissue sections. Matrix application involved applying layers of finely ground dry alpha-cyano-4-hydroxycinnamic acid (CHCA) to the surface of tissue sections thaw mounted onto MALDI targets. It was not possible to detect the drug when applying matrix in a standard aqueous-organic solvent solution. The drug was detected at higher concentrations in specific regions of the brain, particularly the white matter of the cerebellum. Pseudomultiple reaction monitoring imaging was used to validate that the observed distribution was the target compound. The semiquantitative data obtained from signal intensities in the imaging was confirmed by laser microdissection of specific regions of the brain directed by the imaging, followed by hydrophilic interaction chromatography in combination with a quantitative high-resolution mass spectrometry method. This study illustrates that a dry matrix coating is a valuable and complementary matrix application method for analysis of small polar drugs and metabolites that can be used for semiquantitative analysis.

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This thesis explores the processes of team innovation. It utilises two studies, an organisationally based pilot and an experimental study, to examine and identify aspects of teams' behaviours that are important for successful innovative outcome. The pilot study, based in two automotive manufacturers, involved the collection of team members' experiences through semi-structured interviews, and identified a number of factors that affected teams' innovative performance. These included: the application of ideative & dissemination processes; the importance of good team relationships, especially those of a more informal nature, in facilitating information and ideative processes; the role of external linkages in enhancing quality and radicality of innovations; and the potential attenuation of innovative ideas by time deadlines. This study revealed a number key team behaviours that may be important in successful innovation outcomes. These included; goal setting, idea generation and development, external contact, task and personal information exchange, leadership, positive feedback and resource deployment. These behaviours formed the basis of a coding system used in the second part of the research. Building on the results from the field based research, an experimental study was undertaken to examine the behavioural differences between three groups of sixteen teams undertaking innovative an task to produce an anti-drugs poster. They were randomly assigned to one of three innovation category conditions suggested by King and Anderson (1990), emergent, imported and imposed. These conditions determined the teams level of access to additional information on previously successful campaigns and the degree of freedom they had with regarding to the design of the poster. In addition, a further experimental condition was imposed on half of the teams per category which involved a formal time deadline for task completion. The teams were video taped for the duration of their innovation and their behaviours analysed and coded in five main aspects including; ideation, external focus, goal setting, interpersonal, directive and resource related activities. A panel of experts, utilising five scales developed from West and Anderson's (1996) innovation outcome measures, assessed the teams' outputs. ANOVAs and repeated measure ANOVAs were deployed to identify whether there were significant differences between the different conditions. The results indicated that there were some behavioural differences between the categories and that over the duration of the task behavioural changes were identified. The results, however, revealed a complex picture and suggested limited support for three distinctive innovation categories. There were many differences in behaviours, but rarely between more than two of the categories. A main finding was the impact that different levels of constraint had in changing teams' focus of attention. For example, emergent teams were found to use both their own team and external resources, whilst those who could import information about other successful campaigns were likely to concentrate outside the team and pay limited attention to the internal resources available within the team. In contrast, those operating under task constraints with aspects of the task imposed onto them were more likely to attend to internal team resources and pay limited attention to the external world. As indicated by the earlier field study, time deadlines did significantly change teams' behaviour, reducing ideative and information exchange behaviours. The model shows an important behavioural progression related to innovate teams. This progression involved the teams' openness initially to external sources, and then to the intra-team environment. Premature closure on the final idea before their mid-point was found to have a detrimental impact on team's innovation. Ideative behaviour per se was not significant for innovation outcome, instead the development of intra-team support and trust emerged as crucial. Analysis of variance revealed some limited differentiation between the behaviours of teams operating under the aforementioned three innovation categories. There were also distinct detrimental differences in the behaviour of those operating under a time deadline. Overall, the study identified the complex interrelationships of team behaviours and outcomes, and between teams and their context.