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Influence of geometry on the thermal-hydraulic performance of plate heat exchangers

Fernandes, Carla S.; Dias, Ricardo P.; Nóbrega, João M.; Maia, João M.
Fonte: Instituto Politécnico de Bragança Publicador: Instituto Politécnico de Bragança
Tipo: Conferência ou Objeto de Conferência
Português
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Associar ao Dep. de Tecnologia Química e Biológica - docente Ricardo Dias. Este artigo não pode estar disponível para ninguém uma vez que ainda é um trabalho em curso associado ao meu doutoramento (não sei se colocar restricted acess é suficiente para ti...); Thermal-hydraulic performance of plate heat exchanger is strongly dependent on their geometrical properties and variable viscosity effects. On the laminar region, numerical simulations with power-law fluids were performed in order to understand the influence of corrugation angle, shear thinning and thickening effects on the performance of these equipments. Corrugation angles of plate heat exchangers passages were varied between 15º and 85º and the flow index behaviour of power-law fluids between 0.85 and 1.5. The thermal-hydraulic performance of the different passages was analysed resorting to the area goodness factor. Maximum area goodness factors were obtained on corrugation angles close to 59º or 75º, depending on the flow index behaviour of the fluid. Due to the high shear rates developed on the complex passages of plate heat exchangers, shear thinning effects greatly enhances the performance of this equipments.

A comparison of performance indexes in DC-DC converters under different stabilizing state-dependent switching laws

Yoshimura, Victor L.; Assunção, Edvaldo; Teixeira, Marcelo C. M.; Mainardi, Edson I.
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Conferência ou Objeto de Conferência Formato: 1069-1075
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This paper deals with the problem of establishing stabilizing state-dependent switching laws in DC-DC converters operating at continuous conduction mode (CCM) and comparing their performance indexes. Firstly, the nature of the problem is defined, that is, the study of switched affine systems, which may not share a common equilibrium point. The concept of stability is, therefore, broadened. Then, the central theorem is proposed, from which a family of switching laws can be derived, namely the minimum law and the hold state law. Some of these are proved to stabilize the basic DC-DC converters and then, their performances are compared to another law, from a previous work, by simulation, where a great reduction in overshoot is obtained. © 2011 IEEE.

Performance measurement and management in portuguese law enforcement

Gomes, Patrícia S.; Mendes, Silvia M.
Fonte: Routledge Publicador: Routledge
Tipo: Artigo de Revista Científica
Publicado em //2013 Português
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Performance measurement of police services is complicated by ambiguous and complex goal- and objectives-setting, and by the difficulties of measuring outputs. This article looks at the organizational and management changes being made in Portuguese police forces. The authors fill a gap in the literature on performance measurement in Portugal by taking a national approach to the study of how law enforcement agencies are introducing new management accounting changes. The article therefore widens the debate on performance measurement and performance improvements in law enforcement.

CURSOS DE DIREITO NO BRASIL: EMBATES EM TORNO DA EXPANSÃO E DO CONTROLE DO EXERCÍCIO PROFISSIONAL (1995-2002); Law Courses in Brazil: collisions around the expansion and control of the professional performance (1995-2002)

CRUVINEL, érika Bernardes Palazzo Ribeiro
Fonte: Universidade Federal de Goiás; BR; UFG; Mestrado em Educação; Ciências Humanas Publicador: Universidade Federal de Goiás; BR; UFG; Mestrado em Educação; Ciências Humanas
Tipo: Dissertação Formato: application/pdf
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The target of this present investigation consists of to analyze the expansion process of the Brazilian college, especially Law Courses, for the period of 1995-2002. In a strict sense, it studies the established collisions by the civil society and the State around the expansion of Law Courses and the control of the professional performance. To reach these targets, the proposals for Law education were analyzed, done by the main political subjects involved with this discussion: The Brazilian Lawyers Order Ordem dos Advogados do Brasil (OAB) , The Private Universities Association Associação das Universidades Privadas (Anup) , and The Maintainers of College Education Brazilian Association Associação Brasileira das Mantenedoras de Ensino Superior (Abmes) . A bibliography research was realized with the objective of grasping the meaning of the entities proposals and knowing the reform of the State s proposal, and the educational legislation of FHC Government. Available information from INEP/MEP subsidized the characterization of the college education expansion and of the law courses during this studied period of time. The research refers to the large concept of state by Gramsci (2000), which contributed to the comprehension of the relation between the State and the civil society of the end of 1990 s decade and the beginning of the 21st century. In this context...

Die versicherungsrechtliche Erfüllungshaftung und das allgemeine Schuldrecht nach der Schuldrechtsmodernisierung; The Liability for Performance for insurers ("versicherungsrechtliche Erfüllungshaftung) and the German Law of Obligations after the Reform of the Law of Obligations ("Schuldrechtsreform") 2002

Pütz, Andrea Agnes
Fonte: Universidade de Tubinga Publicador: Universidade de Tubinga
Tipo: Dissertação
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Die Arbeit beschäftigt sich mit dem speziell versicherungsrechtlichen Institut der versicherungsrechtlichen Erfüllungshaftung und dessen Verbindungen zum allgemeinen Schuldrecht. Anlass hierfür bieten die Schuldrechtsmodernisierung, die die culpa in contrahendo und den Wegfall der Geschäftsgrundlage kodifizierte, sowie das Gesetz über den Versicherungsvertrag, das zum 1.1.2008 ein neues Versicherungsvertragsgesetz einführte. Die Verfasserin klärt die einzelnen Fallgruppen der versicherungsrechtlichen Erfüllungshaftung und die Bedeutung dieser speziell den Versicherer treffenden Haftung für seine Agenten in den letzten 10 Jahren und führt die einzelnen Fallgruppen alternativen Lösungsmöglichkeiten des Versicherungsrechts und des bürgerlichen Rechts zu. Im Mittelpunkt der Arbeit stehen die Lösung sämtlicher Konstellationen der versicherungsrechtlichen Erfüllungshaftung über § 5 Absatz 3 VVG und die culpa in contrahendo, die positive Vertragsverletzung und den Wegfall der Geschäftsgrundlage. Die Verfasserin setzt sich mit der speziellen Haftungsfolge der Erfüllungshaftung, der Vertragsanpassung, auseinander und legt dar, dass diese Haftungsfolge auch bei einer Lösung über Vorschriften des Bürgerlichen Gesetzbuchs erreicht werden kann...

Análisis de la relación entre flexibilidad en operaciones y performance empresarial mediante técnicas bibliométricas; Relationship between operational flexibility and performance through bibliometric techniques

Serrano Bedia, Ana María; López Fernández, María Concepción; Pérez Pérez, Marta
Fonte: CSIC Publicador: CSIC
Tipo: info:eu-repo/semantics/article; publishedVersion
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RESUMEN. El propósito de este trabajo es realizar un análisis bibliométrico en el campo del management de operaciones, en concreto el tema que relaciona flexibilidad operativa y la performance empresarial, en el periodo 1981-2011. En el análisis se aplican tanto indicadores de actividad (cuantificación de autores, revistas o Ley de Lotka) como de relación (citas por autor y revista, co-citación entre autores y análisis de co-palabras) utilizando como fuente de datos el Social Sciences Citation Index de Web of Science. Los resultados proporcionados por los indicadores de actividad han puesto de manifiesto que se trata de un campo de estudio relativamente reciente, en el que se verifica el cumplimiento de la ley de Lotka, y en el que los autores y revistas más productivos no necesariamente coinciden con los más citados. El análisis de co-citas ha identificado los autores que constituyen el marco teórico consolidado de referencia. Por último, el análisis de co-palabras ha permitido identificar las temáticas de investigación que conforman el ámbito de estudio y su clasificación en ampliamente desarrolladas, periféricas especializadas, periféricas poco desarrolladas y emergentes, a las que se debe prestar atención para contribuir al desarrollo y consolidación del campo.; ABSTRACT. The purpose of this paper is to present a bibliometric analysis in the field of operations management...

Assessment of Fitts' Law for Quantifying Combined Rotational and Translational Movements

Stoelen, Martin Fodstad; Akin, David L.
Fonte: SAGE Publications Publicador: SAGE Publications
Tipo: info:eu-repo/semantics/acceptedVersion; info:eu-repo/semantics/article
Publicado em /02/2010 Português
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Objective: To develop a model for human performance in combined translational and rotational movements based on Fitts' law. Background: Fitts' law has been successfully applied to translational movements in the past, providing generalization beyond a specific task as well as performance predictions. For movements involving both translations and rotations, no equivalent theory exists, making comparisons of input devices for these movements more ambiguous. Method: The study consisted of three experiments. In the first two, participants performed either pure translational or pure rotational movements of 1 degree of freedom. The third experiment involved the same movements combined. Results: On average, the performance times for combined movements were equal to the sum of the times for equivalent separate rotational and translational movements. A simple Fitts' law equivalent for combined movements with a similar slope as the separate components was proposed. In addition, a significant degree of coordination of the combined movements was found. This had a strong bias toward a parallel execution in 12 out of 13 participants. Conclusion: Combined movements with rotations and translations of 1 degree of freedom can be approximated using a simple Fitts' law equivalent. The rotational and translational components appear to be coordinated by the central nervous system to generate a parallel execution. Application: The results may help drive human interface designs and provide insights into the coordination of combined movements. Future extensions may be possible for the movements of higher degrees of freedom used in robot teleoperation and virtual reality applications.; This work was supported by the Institute for Dexterous Space Robotics (Grant No. NNX06AD23G).

Analysis of General Accounting Office, Armed Services Board of Contract Appeals, and Federal Court of Claims decisions on disputes involving performance specifications

Murphy-Sweet, Philip A.
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Formato: xii, 87 p. : ill. ; 28 cm.
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Approved for public release; distribution is unlimited; Approved for public release; distribution is unlimited; This thesis analyzed rulings and court cases from the General Accounting Office, Armed Services Board of Contract Appeals and Federal Court of Claims with respect to contract protests and disputes involving Performance Specifications. Performance Specifications generally leave the contractor open to decide the best means to accomplish the work of a contract and deliver the product called for in the contract. As compared with Design Specifications, which tell the contractor exactly the processes and materials that must be used to accomplish the task, Performance Specifications only specify the final product to be delivered and the parameters it will fulfill or operate within, and thus leave the contractor open to decide the best processes and procedures to accomplish the task. The use of Performance Specifications in the Defense acquisition process has been mandated from the Secretary of Defense since 1994. The intent in using Performance Specifications was to provide incentive to the contractor to become innovative and resourceful in performing the contract and hopefully, result in cost avoidances and savings to the Federal Government. This thesis will examine protests and disputes from the above sources to evaluate the use of Performance Specifications to date and compile any patterns of success or failure that can then be passed on to today's acquisition workforce.; Lieutenant Commander...

Enforcement of Labor Regulation, Informal Labor, and Firm Performance

Almeida, Rita; Carneiro, Pedro
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
Tipo: Publications & Research :: Policy Research Working Paper; Publications & Research
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This paper investigates how enforcement of labor regulation affects the firm's use of informal employment and its impact on firm performance. Using firm level data on informal employment and firm performance, and administrative data on enforcement of regulation at the city level, the authors show that in areas where law enforcement is stricter firms employ a smaller amount of informal employment. Furthermore, by reducing the firm's access to unregulated labor, stricter enforcement also decreases average wages, productivity, and investment. The results are robust to several specification changes, and to instrumenting enforcement with (1) measures of access of labor inspectors to firms, and (2) measures of general law enforcement in the area where the firm is located.

"Strengthening Performance Accountability in Honduras" : Institutional Governance Review : Executive Summary

World Bank
Fonte: World Bank Publicador: World Bank
Tipo: Economic & Sector Work :: Institutional and Governance Review (IGR)
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Having achieved fundamental milestones in terms of representative democracy and institutional modernization, Honduras continues to face important challenges in its bid to provide public services with coverage and quality commensurate with the resources available to the country. Honduras has come a long way in its democratic development, with seven free elections held since 1981 and the military subordinated to civilian control. Since the 1980s, the country has undertaken key public sector management reforms and has all of the formal components of a modern democracy. However, its average rate of economic growth and its degree of progress in reducing poverty over the past two decades have been low relative to most other Latin American countries, at this growth rate, Honduras will reach the current income per capita of El Salvador ($2,530) in 2050. Efficiency of public spending continues to be very low compared to regional standards, and the capacity of the public administration insufficient for ensuring the minimum goal of universal coverage of basic services. A general conclusion...

"Strengthening Performance Accountability in Honduras" : Institutional Governance Review : Background Chapters

World Bank
Fonte: World Bank Publicador: World Bank
Tipo: Economic & Sector Work :: Institutional and Governance Review (IGR)
Português
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Having achieved fundamental milestones in terms of representative democracy and institutional modernization, Honduras continues to face important challenges in its bid to provide public services with coverage and quality commensurate with the resources available to the country. Honduras has come a long way in its democratic development, with seven free elections held since 1981 and the military subordinated to civilian control. Since the 1980s, the country has undertaken key public sector management reforms and has all of the formal components of a modern democracy. However, its average rate of economic growth and its degree of progress in reducing poverty over the past two decades have been low relative to most other Latin American countries, at this growth rate, Honduras will reach the current income per capita of El Salvador ($2,530) in 2050. Efficiency of public spending continues to be very low compared to regional standards, and the capacity of the public administration insufficient for ensuring the minimum goal of universal coverage of basic services. A general conclusion...

Perceptions of the Judiciary's Performance in Serbia; Results of the Survey with the General Public, Enterprises, Lawyers, Judges, Prosecutors, and Court Administrative Staff

World Bank
Fonte: Washington, DC Publicador: Washington, DC
Tipo: Report; Economic & Sector Work; Economic & Sector Work :: Law and Justice Study
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With the purpose of providing assistance to government efforts in justice sector reform and modernization, the World Bank conducted two surveys. The first survey was conducted in 2010 in order to collect baseline information on perceptions of the court and prosecutorial performance and expectations from the reform implemented in January 2010. The second, follow-up, survey was conducted in 2013 in order to identify the impact of the first four years (2010 - 2013) of reforms and the expectations from the new national strategy of reform for the period 2014-2018. The surveys aimed to measure perceptions of judicial performance against five core values (efficiency, quality, fairness, accessibility, and integrity - independence and presence of corruption), and to compare the views of multiple stakeholders (court services users - general public and business sector, court services providers -judges, prosecutors and providers of court administrative services, and lawyers as intermediaries between users and providers of court services). The survey also focused on costs of judicial services...

Corporate Governance, Investor Protection, and Performance in Emerging Markets

Klapper, Leora F.; Love, Inessa
Fonte: World Bank, Washington, D.C. Publicador: World Bank, Washington, D.C.
Tipo: Publications & Research :: Policy Research Working Paper; Publications & Research
Português
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Recent research studying the link between law, and finance has concentrated on country-level investor protection measures, and focused on differences in legal systems across countries, and legal families. The authors extend this literature, and provide a study of firm-level corporate governance practices across emerging markets, and a greater understanding of the environments under which corporate governance matters more. Their empirical tests show that better corporate governance is highly correlated with better operating performance, and market valuation. More important, the authors provide evidence showing that firm-level corporate governance provisions, matter more in countries with weak legal environments. These results suggest that firms can partially compensate for ineffective laws, and enforcement by establishing good governance, and providing credible investor protection. The authors' tests also show that firm-level governance, and performance is lower in countries with weak legal environments...

Bulgaria Judicial Performance, Caseload and Expenditure Review (2008-2014)

World Bank
Fonte: Washington, DC Publicador: Washington, DC
Tipo: Report; Economic & Sector Work :: Legal and Judicial Sector Assessment
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The World Bank published a Public Expenditure and Institutional Review (PEIR) of the Bulgarian justice sector entitled “Resourcing the Judiciary for Performance and Accountability: A Judicial Public Expenditure and Institutional Review” in 2008. The objective of the present study is to conduct an assessment of the spending and institutional changes in Bulgaria’s judiciary from 2008 onwards. The current report examines the principal trends in resourcing Bulgaria’s judiciary since 2008, while comparing the expenditure and judicial performance with those of other European countries. The report provides a set of conclusion and recommendations for improving the efficiency and effectiveness of Bulgaria’s judiciary and the judicial budget process.

Industrial disputes and the law in Spain

Milner, S.
Fonte: Centre for Economic Performance, London School of Economics and Political Science Publicador: Centre for Economic Performance, London School of Economics and Political Science
Tipo: Monograph; NonPeerReviewed Formato: application/pdf
Publicado em /07/1995 Português
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Strike activity in Spain is unusually high compared to most other developed countries and, moreover, it has remained at a high level for the last decade, whilst strike rates have been falling in most other countries. One possible explanation for this poor strikes record is Spanish labour law with respect to industrial disputes which may be too permissive, or have remained permissive whilst other countries have tightened their legislative frameworks. By investigating the comparative strike record and comparative strike law across Europe, it is clear that neither of the above scenarios holds true. Spanish law is neither particularly permissive, nor has it become more permissive relative to other countries which suggests that, given some caveats, Spanish strikes law cannot be held responsible for the poor strike record. Some tentative assessment of other possible explanations is made using industry data on strikes, collective bargaining coverage and levels, union representation and the proportion of fixed-term contract workers. Taken together these results are indicative of a role for non--legal industrial or labour market institutions in explaining strikes. There is clearly, though, a crying need for more micro industrial relations data sets to properly test the influence of both exogenous and endogenous factors in explaining strikes.

The impact of the law on industrial disputes in the 1980s: report of a survey of public transport employers

Elgar, J.; Simpson, R.
Fonte: Centre for Economic Performance, London School of Economics and Political Science Publicador: Centre for Economic Performance, London School of Economics and Political Science
Tipo: Monograph; NonPeerReviewed Formato: application/pdf
Publicado em /11/1994 Português
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This paper reports the results of one part of a research project which investigated the nature and extent of the impact of the labour legislation enacted between 1980 and 1990 on the conduct of the industrial relations and the processes by which this came about. Interviews were carried out with managers in three major public sector transport organisations. All three were subject to radical organisational change during the period under review and had quite extensive experience of dispute in this time. While they had made greater use of the law than employers in other sectors covered by the research project, there were mixed views on the results of this resort to the law. In general the law appeared to be a subsidiary part of, and influence on, the management of the process of change rather than an independent factor influencing management''s relations with trade unions and the workforce.

The impact of the law on industrial disputes in the 1980s: report of a survey of managers in the National Health Service

Elgar, J.; Simpson, R.
Fonte: Centre for Economic Performance, London School of Economics and Political Science Publicador: Centre for Economic Performance, London School of Economics and Political Science
Tipo: Monograph; NonPeerReviewed Formato: application/pdf
Publicado em /11/1994 Português
Relevância na Pesquisa
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This paper reports the results of one part of a research project which investigated the nature and extent of the impact of the labour legislation enacted between 1980 and 1990 on the conduct of industrial relations and the processes by which this came about. Interviews were carried out with the managers at national, district and unit or trust level in the National Health Service. Although there had been major national disputes and industrial action in the 1980s, local issues were the most likely source of disputes and possible industrial action. The experience of the 1980s therefore had a continued relevance after the 1990 reforms encouraged extensive devolution of industrial relations issues to unit level. The only notable legal ingredient in management responses to industrial action was deductions from the pay of staff who were not working normally, but on this as on other issues there were notable variations in practice in different areas. In general the law did not seem to be central component in management thinking on how to respond to disputes.

The impact of the law on industrial disputes in the 1980s: report of a survey of education authorities

Elgar, J.; Simpson, R.
Fonte: Centre for Economic Performance, London School of Economics and Political Sciences Publicador: Centre for Economic Performance, London School of Economics and Political Sciences
Tipo: Monograph; NonPeerReviewed Formato: application/pdf
Publicado em /05/1994 Português
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This paper reports the results of one part of a research project designed to investigate the nature and extent of the impact of the labour legislation enacted between 1980 and 1990 on the conduct of industrial relations and the processes by which this has come about. Interviews were carried out with officers in the education departments of ten Local Education Authorities. All had felt the impact of major national disputes from the mid-1980s to early 1990s. The most important legacy of this experience so far as the law was concerned was that it had now become generally the case that any significant industrial action would lead to Authorities considering whether to make deductions from the pay of workers concerned. Modification to the structure for the provision of public sector education under the Education Acts of the late 1980s and early 1990s was a far more important legal influence. This required significant change in established industrial relations and employment practices and could be a cause of dispute to which the labour legislation of the 1980s was of limited relevance.

The impact of the law on industrial disputes in the 1980s: report of a survey of construction companies

Elgar, J.; Simpson, R.
Fonte: Centre for Economic Performance, London School of Economics and Political Science Publicador: Centre for Economic Performance, London School of Economics and Political Science
Tipo: Monograph; NonPeerReviewed Formato: application/pdf
Publicado em /05/1994 Português
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This paper reports the results of one part of a research project designed to investigate the nature and extent of the impact of the labour legislation enacted between 1980 and 1990 on the conduct of industrial relations and the processes by which this has come about. Interviews were carried out with managers in a number of companies affiliated to both the Building Employers'' Confederation and the Federation of Civil Engineering Contractors. There was a broad similarity in the experience of all our respondents. An accelerated trend away from direct employment was generally seen to be the main factor explaining the low incidence of industrial action over the period under review. The law had been of limited relevance to their industrial relations activities but it was seen as having made some contribution to creating an environment in which management could feel more confident in pursuing its goals.

The impact of the law on industrial disputes in the 1980s: report of a survey of printing employers

Elgar, J.; Simpson, R.
Fonte: Centre for Economic Performance, London School of Economics and Political Science Publicador: Centre for Economic Performance, London School of Economics and Political Science
Tipo: Monograph; NonPeerReviewed Formato: application/pdf
Publicado em /04/1994 Português
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This paper reports the results of one part of a research project designed to investigate the nature and extent of the impact of the labour legislation enacted between 1980 and 1990 on the conduct of industrial relations and the processes by which this has come about. Interviews were carried out with managers in a number of printing companies affiliated to the British Printing Industries Federation (BPIF). In general, these managers did not see the law to be particularly relevant to their own experience. The law had not disrupted established industrial relations practices but considerable change had been achieved without major confrontation with the unions. While the law was not a prominent feature of the management of the process of change, it was seen to be a background factor of real, if limited, significance.