Validation of NASA rotor 67 with openFOAM's transonic density-based solver

Dissertação para obtenção do Grau de Mestre em Engenharia MecânicaA transonic density based solver implemented in OpenFOAM is shown to be robust and presents consistent results, when simulating three dimensional viscid ows in a low pressure compressor. Towards the validation of the code above, the NASA Rotor 67 geometry has been tested in di erent mesh levels, with and without tip-gap, with grid independence being suggested. It is used an odd approach in turbomachinery, to compare experimental with numerical data: BIAS, Root Mean Square Error and Concordance Index compare results in pitch-wise and stream-wise directions, provided a linear interpolation to correct all data. Several Riemann problems are simulated to test the shock resolution and entropy conditions due to the transonic nature of the Rotor 67 ow. Finally, a full compressor stage is assembled with the Mixing Plane method and a solution to the multi-row problem is achieved, increasing the reliability of OpenFOAM libraries

The cultural models in international business research: A bibliometric study of IB journals

Culture has been a widely researched topic in the International Business (IB) literature over the last decades. To better understand what culture actually means and its implication in firms? IB operations, several cultural models and taxonomies have been put forward. In this paper we seek to scrutinize the use of three well known cultural models - Hall?s (1976), Hofstede?s (1980a) and Trompenaars & Hampden-Turner?s (1993) - in the extant research. Using bibliometric techniques of the papers published in the top ranked IB journals, we performed a citation and co-citation analysis to find out the most influential model and to examine the possible linkages between models and to the issues being researched. We conclude that Hofstede?s (1980a) taxonomy is the most cited and his taxonomy has strong linkages to several streams of research. Nonetheless, we also find that there are noticeable differences on how research in different journals make use of the cultural models, probably reflecting not surprising disciplinary emphases.Cultural models, Hofstede, Trompenaars, Hall, bibliometric study

Performance drivers and the public vs. private management debate on water sector companies : conclusions from the Portuguese case

Since the introduction of Public Private Partnerships as a financing model that the discussion around its advantages has been intense. Using as example a strategic and fundamental sector as the water sector, we analyzed what are the main drivers for financial and service quality performance. Public databases for Portuguese water companies were used and performance levels computed, using an evaluation model, Finally, regression analysis was used in order to achieve conclusions on the variables that enhance performance, and also to access the best management model – public or private. Aligned with the findings of the literature review, no clear advantage in private management was found. Nevertheless, solid conclusions were found that longer periods of concession and shorter periods until the end of the concession yield higher performance levels

Mergers & acquisitions research: A bibliometric study of top strategy and international business journals, 1980–2010

Mergers and acquisitions (M&As) are important modes through which firms carry out their domestic and international strategies and have been noted as the CEOs favorite strategy. As a significant field of study, M&Aresearch has accumulated substantial knowledge. This bibliometric study examines the extant strategy and international business literature on M&As. Methodologically, we examined a sample of 334 articles published in sixteen leading management/business journals, during a 31 year period — from 1980 to 2010. The results provide a global perspective of the field, identifying the works that have had the greater impact, the intellectual interconnections among authors and works, the main research traditions, or themes, delved upon on M&Arelated research. Structural and longitudinal analyses reveal the changes in the intellectual structure of the field over time. A discussion on the accumulated knowledge and future research avenues concludes this paper.info:eu-repo/semantics/publishedVersio

Industrial network membership: Reducing psychic distance hazards in the internationalization of the firm

The network approach to internationalization of the firms has warranted the research focus of many international business scholars. Firms are increasingly involved in international business endeavors and arguably need to learn to adapt to idiosyncratic milieus they encounter in the foreign markets. This paper proposes a conceptual model suggesting that integration in networks strengthens corporate competitiveness in international markets. Network membership provides access to knowledge that facilitates adaptation to the various dimensions - economic, political, legal, cultural ? of the international business environments. Membership in social and business networks are likely to ease internationalization by reducing firms? perceived psychic distance.Networks, internationalization theories, psychic distance

A integração da empresa em redes industriais: minimizar os efeitos da distância psíquica na internacionalização de empresas

Comunicação apresentada no III ELBE/SLADE, Fortaleza, 2010.A abordagem de redes para a internacionalização tem sido estudada por diversos investigadores na área dos negócios internacionais. As empresas envolvem-se crescentemente em negócios internacionais, pelo que necessitam de aprender a adaptar-se às diferenças que encontram nos mercados externos. Neste artigo propomos um modelo conceptual que sugere que a integração em redes industriais reforça a capacidade competitiva das empresas nos mercados externos. Pertencer a redes de empresas permite ter acesso a conhecimento que facilita a entrada nos mercados internacionais, melhor adaptação a ambientes económica, politica, legal e culturalmente diferentes do seu país de origem. A integração em redes permite, portanto, reduzir a distância psíquica percebida. A partir da revisão de literatura das teorias da internacionalização, com especial enfoque na escola de Uppsala, das redes industriais e do conceito de performance, discutimos a importância das redes de industriais na internacionalização das empresas

A performance na abordagem RBV: estudo das publicações do JIBS

Comunicação apresentada no XIV Encuentro AECA, Coimbra, 2010.A medição de performance é uma questão que não reúne consenso, apesar de amplamente estudada. Mesmo numa área restrita da investigação em gestão como os negócios internacionais, diversas medidas de performance são utilizadas. Neste artigo, recorremos aos artigos publicados no Journal of International Business Studies no período entre 2000 e 2009 que utilizam a perspectiva RBV. Com base nos artigos identificados, procurámos identificar qual o tipo de medida de performance mais utilizado nos negócios internacionais, sob a perspectiva RBV

A empresa e o meio nas teorias económicas da empresa: uma leitura longitudinal

A teoria económica tem tentado compreender e explicar o comportamento das empresas nos mercados. Contudo, persistem grandes divergências acerca do papel das diferentes forças que influenciam o crescimento e os objectivos das empresas. Sintetizar os principais contributos dos autores mais relevantes das diferentes teorias económicas parece útil. Assim, neste artigo fazemos uma breve revisão das teorias da empresa desde a teoria neoclássica até ao conceito de capacidades dinâmicas e o impacto nas empresas das alterações do ambiente onde se inserem

Managing in a foreign country: the influence of culture in management decisions

Comunicação apresentada no III ELBE/SLADE, Fortaleza, 2010.The world’s increasingly global economics is well documented fact. Globalization means people worldwide are becoming more similar, but there are still very important differences. Culture is an important factor that makes two countries unlike. In this paper we present three conceptual propositions on the effects of culture in management, at three different levels (corporate, business and functional). We argue that culture plays influences the management decisions at all three levels, affecting the firm’s success