Exclusive glueball production in high energy nucleus-nucleus collisions

The cross sections for the glueball candidates production in quasi-real photon-photon collisions and on central diffraction processes, i.e. double Pomeron exchange, in heavy ion interactions at RHIC and LHC are computed. The rates for these distinct production channels are compared and they may be a fruitful approach to the investigation of glueballs.Comment: 6 pages, 2 tables. Final version to be published in Physical Review

Investigating photoproduction of scalar mesons at medium energies

In this letter we study the photoproduction of scalar mesons in the intermediate energies considering distinct mixing scenarios in the description of meson physical states. The differential and integrated total cross section are computed for the cases of the mesons a_0(980), f_0(1500) and f_0(1710) focusing the GlueX energy regime with photon energy equal to 9 GeV. Our results indicate that light-quark scalar meson photoproduction is well suited for studying hybrid mesons structure.Comment: 4 pages, 3 figures, 2 tables. Version to be published in Physical Review

CORRELATION BETWEEN CUTTING TEMPERATURES AND METALLURGICAL PROPERTIES OF COMPACTED GRAPHITE CAST IRONS IN THE END MILLING PROCESS

In the search for more energy-efficient internal combustion engines, the automotive companies keep pushing the working temperatures and pressures of the engines, leading to more extreme working conditions and so the necessity of new materials. Among the most promising materials for the new generations of engines is the compacted graphite cast iron, which is more wear-resistant than aluminum and tougher than gray cast iron. However, this combination of properties also leads to decreased machinability, increasing production costs and, therefore, their market competitiveness. This paper evaluated the correlation of mechanical and metallurgical properties and the cutting power and surface roughness of three grades of compacted graphite cast iron with the cutting temperature in the end milling process under different two different feed rates and cutting speeds. This analysis showed that the temperatures near the cutting zone are closely correlated to the material's mechanical properties, machining power, and resulting roughness. These results indicate that thermographic images are a good indicator of the overall correlation between the changes in material properties and the most usual machinability output parameters.

Práticas Organizacionais e Estrutura de Relações no Campo do Desenvolvimento Metropolitano

The aim of this study is to examine the relationships between the organizations responsible for urban planning in the towns of the Metropolitan Region of Curitiba, Brazil, and how these relationships influence urban development practices. In the article we establish a definition of organizational practices in accordance with social practices and, empirically, we enquire how the urbanism model of the capital city of Paraná State impacts on the towns in the region. The theoretical frame of reference is characterized by the institutional theory in its structurationist approach. When describing the research strategy, we outline the relationships between the organizations of the towns of the Metropolitan Region of Curitiba through a social network analysis. Meanwhile, the urban development practices were identified based on secondary data and statements by 62 public managers. The results show a low density in direct relationships between town halls, with the network becoming more dense when State Government departments are involved. Despite the low level of direct influence of Curitiba’s urbanism on the other towns of the metropolitan region, characteristics of domination, signification and legitimization reveal some isomorphic practices and the presence of Brazilian cultural factors influencing the way public organizations act

Campos Organizacionais: Seis Diferentes Leituras e a Perspectiva de Estruturação

The concept of the organizational field has been greatly dealt with in the literature on institutional theory in recent years. As the concept of field involves a relational and symbolic dimension, we propose that the theory of structuration, based on the logic of recursiveness between agency and structure should be adapted to the understanding of the field dynamically. In this way, the objective of this theoretical essay is to deal with the dynamic of the organizational field using structurationist logic, allowing that from this logic we recall both the importance of the practice in the structuration process of the organizational field and the historical and recursive character which may constrain or enable the actions of social actors. To this end, we revise the concept of field in different perspectives of analysis, reflecting on the implication of the theoretical presuppositions of each approach and then discuss in a critical manner the theoretical foundation of the structuration process of organizational fields based on the structurationist approach. We conclude the paper with propositions pertaining to the revision of the concept of field from a multiparadigmatic viewpoint in which structure and agency are recursively implied

Organizational Fields and the Structuration Perspective: Analytical Possibilities

The concept of the organizational field has been greatly dealt with in the literature on institutional theory in recent years. As the concept of field involves a relational and symbolic dimension, we propose that the theory of structuration, based on the logic of recursiveness between agency and structure should be adapted to theunderstanding of the field dynamically. In this way, the objective of this theoretical essay is to deal with the dynamic of the organizational field using structurationist logic, allowing that from this logic we recall both the importance of the practice in the structuration process of the organizational field and the historical and recursive character which may constrain or enable the actions of social actors. To this end, we revise the concept of field in different perspectives of analysis, reflecting on the implication of the theoretical presuppositions of each approach and then discuss in a critical manner the theoretical foundation of the structuration process of organizational fields based on the structurationist approach. We conclude the paper with propositions pertaining to the revision of the concept of field from a multiparadigmatic viewpoint in which structure and agency are recursively implied

A Questão da Agência em Redes Acadêmicas de Pesquisa : Centralidade, Produtividade e Escolha

No presente artigo, investigamos o papel da agência na construção do conhecimento científico com base em pressupostos do estruturacionismo. Para tanto, a noção de agência foi empiricamente tratada a partir da análise de redes sociais, tendo como indicadores a centralidade, produtividade e escolha preferencial de pesquisadores do campo da pesquisa na área dos estudos organizacionais e da estratégia em organizações no Brasil. Foram considerados 2.332 artigos entre os anos de 1997 e 2005, por meio dos quais analisamos 2.072 pesquisadores. Destacamos o papel de alguns deles, classificados como continuantes, para avaliar mais detalhadamente indicadores estruturais, além da trajetória de sua produção acadêmica. Nossos achados permitem afirmar que não somente a estrutura social apresenta dualidade, condicionando e habilitando a ação, mas também a própria capacidade de agência. Vista correntemente na literatura como potencialmente transformadora, ela também condiciona a ação dos agentes, pois suas capacidades projetivas tendem a ser guiadas por condutas do passado, no sentido de vincular suas ações à trajetória social e intelectual vivida no campo, podendo acarretar maior conformidade e habitualidade na pesquisa. Denominamos esse fenômeno como paradoxo da capacidade de agência, pois a mesma via que habilita a ação também a limita cognitivamente.In this article, we examine the role of the agency in the construction of scientific knowledge under the assumptions of structurationism. For this purpose, the notion of agency has been empirically treated from the social network analysis, with the indicators being the centrality, productivity and preferential attachment of researchers in the field of organizational studies and strategy in Brazil. We analyzed 2,072 researchers, in that we highlight the role of some of them, classified as continuants, in order to evaluate structural indicators in more detail, in addition to the trajectory of their academic production. Our findings allow us to affirm that it is not only the social structure that shows duality, conditioning and enabling the action, but also the capacity of agency itself. Currently viewed in the literature as a transforming capacity, it also conditions the action of agents because their projective capacities tend to be guided by past conduct in that they link their actions to the social and intellectual trajectory they have experienced in the field, bringing greater conformity and habitualness to research. We have addressed this phenomenon into a cognitive realm and have called it as paradox of agency capability

Conversação entre Abordagens da Estratégia em Organizações: escolha estratégica, cognição e instituição

No presente trabalho pretendeu-se verificar qual o tratamento dispensado ao conceito de estratégia organizacional nas abordagens da escolha estratégica, cognitiva e institucional. Para tanto, delimitaram-se critérios de análise teóricos e metodológicos. A identificação desses critérios foi realizada de modo descritivo, a partir do exame dos pressupostos de cada abordagem focalizada. As descrições dos seus respectivos indicadores foram agrupadas em matrizes de conteúdo e analisadas por meio do uso do método comparativo. Os indicadores dos critérios teóricos foram as representações do indivíduo, da organização e do ambiente. O indicador do critério metodológico foi a dimensão de análise. Os resultados obtidos revelam variações significativas que configuram arranjos específicos de definição e tratamento dos elementos constitutivos da concepção de estratégia organizacional, em cada uma das abordagens analisadas

Institucionalismo Organizacional e Práticas de Governança Corporativa

In this essay, we outline an institutional approach concerning corporate governance, highlighting its dimensions, institutions, and institutionalization. Special attention is paid to the legitimizing quality of governance, since legitimacy is the central point in organizational institutionalism. The literature claims that the legitimacy of governance practices is based not only on rational-utilitarian questions but also on matters of social and symbolic order, e.g., the ideal of distributive justice, in which minority shareholders seek to justify greater control over controlling shareholders and managers guiding organizations on the morality of such requirements. We delineate some elements of the process of institutionalization of corporate governance practices around the world, noting that the emergence of the phenomenon and its spread is the result of several factors that end up pushing the product and capital markets to conform their practices to internationally prevailing standards. We conclude this theoretical essay by highlighting the implications for understanding the governance practices from the standpoint of organizational institutionalism, unfolding possibilities for future studies

ANÁLISE INSTITUCIONAL DA CONSTRUÇÃO DO CONHECIMENTO CIENTÍFICO EM MUNDOS PEQUENOS

O objetivo do presente artigo foi verificar como a estrutura de relacionamento no campo da pesquisa em organizações e estratégia no Brasil condiciona a construção do conhecimento científico nesse campo social. Por meio da análise de redes e com o apoio da análise de conteúdo, foram avaliados 2.332 artigos publicados entre os anos de 1997 e 2005. Com base na vertente estruturacionista da perspectiva institucional de análise examinamos a influência das relações entre autores na persistência e mudança de temáticas no decorrer do tempo. Verificamos que o campo apresenta uma configuração do tipo mundos pequenos (small worlds), o que lhe garante capacidade de persistência institucional em momentos de grande crescimento. Apesar da rede não ser completamente conectada, observamos alto grau de homogeneidade dentro dos agrupamentos mesmo em face da ocorrência de heterogeneidade de temas de pesquisa no campo como um todo. Tal constatação indica que a imersão em grupos sociais condiciona o que é legitimamente aceito no campo científico. A configuração estrutural nos moldes de mundos pequenos possibilita que o campo mantenha significados compartilhados, garantindo durabilidade dinâmica às instituições