Hybrid reflections in InGaP/GaAs(001) by synchrotron radiation multiple diffraction

Hybrid reflections (HRs) involving substrate and layer planes (SL type) [Morelhao et al., Appl. Phys. Len. 73 (15), 2194 (1998)] observed in Chemical Beam Epitaxy (CBE) grown InGaP/GaAs(001) structures were used as a three-dimensional probe to analyze structural properties of epitaxial layers. A set of (002) rocking curves (omega-scan) measured for each 15 degrees in the azimuthal plane was arranged in a pole diagram in phi for two samples with different layer thicknesses (#A -58 nm and #B - 370 nm) and this allowed us to infer the azimuthal epilayer homogeneity in both samples. Also, it was shown the occurrence of (1 (1) over bar3) HR detected even in the thinner layer sample. Mappings of the HR diffraction condition (omega:phi) allowed to observe the crystal truncation rod through the elongation of HR shape along the substrate secondary reflection streak which can indicate in-plane match of layer/substrate lattice parameters. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Magnetism of Co overlayers and nanostructures on W(001): A first-principles study

The magnetic properties of Co nanostructures and a Co monolayer on W(001) have been studied in the framework of density functional theory. Different geometries such as planar and three-dimensional clusters have been considered, with cluster sizes varying between 2 and 13 atoms. The calculations were performed using the real-space linear muffin-tin orbital method (RS-LMTO-ASA). With respect to the stability of the magnetic state, we predict an antiferromagnetic (AFM) structure for the ground state of the planar Co clusters and a ferromagnetic (FM) state for the three-dimensional clusters. For the three-dimensional clusters, one of the AFM arrangements leads to frustration due to the competing FM and AFM exchange interactions between different atoms in the cluster, and gives rise to a non-collinear state with energy close to that of the FM ground state. The relative role of the Co-Co and Co-W exchange interactions is also investigated. (C) 2007 Elsevier B.V. All rights reserved.

Driving forces for the adsorption of cyclopentene on InP(001)

In this work the interaction of cyclopentene with a set of InP(001) surfaces is investigated by means of the density functional theory. We propose a simple approach for evaluating the surface strain and based on it we have found a linear relation between bond and strain energies and the adsorption energy. Our results also indicate that the higher the bond energy, the more disperse the charge distribution is around the adsorption site associated to the high occupied state, a key feature that characterizes the adsorption process. Different adsorption coverages are used to evaluate the proposed equation. Our results suggest that the proposed approach might be extended to other systems where the interaction of the semiconductor surface and the molecule is restricted to first neighbor sites. (C) 2011 Elsevier B.V. All rights reserved.

The role of carbon impurities on the Si(001)-c(4 x 4) surface reconstruction: Theoretical calculations

In this work we employ the state-of-the-art pseudopotential method, within a generalized gradient approximation to the density functional theory, combined with a recently developed method for the calculation of HREELS spectra to study a series of different proposed models for carbon incorporation on the silicon (001) surface. A fully discussion on the geometry, energetics and specially the comparison between experimental and theoretical STM images and electron energy loss spectra indicate that the Si(100)-c(4 x 4) is probably induced by Si-C surface dinners, in agreement with recent experimental findings. (C) 2009 Elsevier B.V. All rights reserved.

Furan interaction with the Si(001)-(2 x 2) surface: structural, energetics, and vibrational spectra from first-principles

In this work we employ the state of the art pseudopotential method, within a generalized gradient approximation to the density functional theory, to investigate the adsorption process of furan on the silicon (001) surface. A direct comparison of different adsorption structures with x-ray photoelectron spectroscopy (XPS), ultra-violet photoelectron spectroscopy (UPS), high resolution electron energy loss spectroscopy (HREELS), near edge x-ray absorption fine structure (NEXAFS), and high resolution spectroscopy experimental data allows us to identify the [4 + 2] cycloaddition reaction as the most probable adsorbate. In addition, theoretical scanning tunnelling microscopy (STM) images are presented, with a view to contributing to further experimental investigations.

Abnormal Corpus Callosum Integrity in Bipolar Disorder: A Diffusion Tensor Imaging Study

Objective: Abnormalities in the anterior interhemispheric connections provided by the corpus callosum (CC) have long been implicated in bipolar disorder (BID). In this study, we used complementary diffusion tensor imaging methods to study the structural integrity of the CC and localization of potential abnormalities in BD. Methods: Subjects included 33 participants with BID and 40 healthy comparison participants. Fractional anisotropy (FA) measures were compared between groups with region of interest (ROD methods to investigate the anterior, middle, and posterior CC and voxel-based methods to further localize abnormalities. Results: In ROI-based analyses, FA was significantly decreased in the anterior and middle CC in the BID group (p <.05). Voxel-based analyses similarly localized group differences to the genu, rostral body, and anterior midbody of CC (p <.05, corrected). Conclusion: The findings demonstrate abnormalities in the structural integrity of the anterior CC in BID that might contribute to altered interhemispheric connectivity in this disorder.

Multiculturalism and Policymaking : A comparative study of Danish and Swedish cultural policies since 1969

This master’s thesis deals with the cultural diversity policies of Denmark and Sweden within the cultural sector. It attempts at explaining why these two “most-similar” scandinavian countries having in common the same cultural model, “the architect model”, opted for different policies when it came to cultural diversity: Assimilationism for Denmark and multiculturalism for Sweden. I show that though institutional and power-interest factors had an impact, ideas as “programmatic beliefs” (Sheri E. Berman 2001) or “frames” (Erik Bleich 2003) played the ultimate role. I evaluate their relative importance by analyzing the anthropological dimension of the countries cultural policies since 1969. The study confirms that at least in the cultural sector, Danish policies have been assimilationist and Swedish ones multiculturalist and proposes a new classification of terms.By investigating immigrants cultures, it fills a gap left by previous researchers working on a common Nordic cultural model.

Las relaciones entre Chile y Suecia durante el primer gobierno de Olof Palme, 1969-1976

Durante el primer gobierno del socialdemócrata Olof Palme, las relaciones bilaterales entre Chile y Suecia fueron las más intensas de toda su historia, tanto en cercanía como en conflictividad. La razón la encontramos en los distintos fenómenos políticos que vivió Chile en ese periodo, puesto que Palme coincidió temporalmente con tres gobiernos claramente diferenciados: la Democracia Cristiana, la Unidad Popular y el Régimen Militar. Si las relaciones sueco-chilenas tuvieron su mejor momento durante el mandato de Salvador Allende, el golpe de Estado significó todo lo contrario. El compromiso que tuvo el embajador de Suecia, Harald Edelstam, por quienes eran perseguidos en Chile le llevó a su expulsión, lo que se tradujo en un claro deterioro de las relaciones y el inicio de una nueva etapa marcada por el gran contingente de exiliados que comenzaron a llegar a Suecia. Este trabajo analiza los principales acontecimientos diplomáticos ocurridos entre Chile y Suecia así como las consecuencias que tuvieron durante el gobierno de Olof Palme.

Gay and Lesbian Life at Colby 1969-1974

The history of a gay and lesbian student community at Colby seems to point to the difficulty of visibility. For students who were able to find others like themselves, their group of lesbian and gay friends had to remain underground. For students who were grappling with their newly found, socially stigmatized sexuality, the experience was isolating if they did not know where to find others like themselves. This paper seeks to address the social forces that kept sexually variant students from expressing their sexual identities openly on campus. Part of this difficulty is attributable to the compulsory heterosexuality assumed by general American society at the time, manifested in the silence or outright hostility directed against homosexuals. Naturally, Colby students replicated this assumption. Some of the students we interviewed seemed to internalize compulsory heterosexuality, while it was forced upon others. Religion and psychology were two methods of enforcing heterosexuality that were relevant to the people we interviewed. Another significant obstacle to visibility was Colby's location and the nature of Colby's student body. Waterville, unlike more urban cities, did not have a history of gay life, and thus an established gay community or gay identity into which one could be socialized. Colby, as a small, homogeneous and isolated space, posed difficulties in establishing a gay community as the population to draw from was small and regulated.

Mudança organizacional derivada da implantação da norma OHSAS 18.001: uma abordagem fenomenológica

Dissertação apresentada ao Programa de Pós-graduação em Administração da Universidade Municipal de São Caetano do Sul

Formação da dívida externa brasileira como conseqüência do sistema financeiro desregulamentado : 1969-1982

Esta dissertação trata da formação da dívida externa brasileira, no período 1969-82, como conseqüência do sistema financeiro desregulamentado (euromercado) em operação. Este sistema formou-se e estruturou-se no pós II Guerra Mundial. Até o final da década de 1960, o euromercado acumulou grande quantidade de dólares fora dos Estados Unidos (eurodólares) e criou instrumentos e estruturas para a captação de dinheiro expatriado. A partir de 1970, atuou ativamente oferecendo empréstimos, sem condicionalidades, mas com taxas de juros flutuantes, que deram origem à dívida externa internacional e, especialmente, à brasileira. Esta formou-se, no período estudado, em três etapas: a primeira, 1969-73, foi predominantemente para acumular reservas internacionais, sendo, por isso, especulativa; a segunda, 1974-78, consumiu-se em custos crescentes da dívida, principalmente custos financeiros crescentes, e acumulou-se parcialmente em reservas internacionais, constituindo-se, assim, numa etapa transitória para o endividamento só para cobrir custos financeiros da dívida; na última etapa, 1979-82, formou-se dívida só para pagar juros da dívida e, por isso, foi puramente financeira. A dívida externa brasiliera formou-se, assim, predominantemente em função dos interesses do sistema financeiro desregulamentado, sendo, portanto, uma conseqüência da ação do mesmo.

EMBRAER como empresa estatal (1969-1994)

O relatório pretende analisar a fundação e desenvolvimento da Embraer enquanto empresa estatal no período 1969-1985. Procura-se analisar os fatores econômicos, políticos, gerenciais e tecnológicos que permitiram a instalação de uma indústria de alta tecnologia numa economia emergente como a brasileira. Vamos abordar com um enfoque interdisciplinar os condicionantes do sucesso e dificuldades do empreendimento durante o período da ditadura militar. Tencionamos inserir o caso da Embraer no processo mais geral da política econômica e tecnológica do regime numa fase em que a economia brasileira estava se recuperando do processo de estabilização implantado pelo governo Castello Branco e ganhando uma nova dinâmica de abertura para o exterior e ampliação das exportações.