3,060 research outputs found

    LCR-2, a fortran lattice constant refinement program

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    This report describes a computer program which refines lattice constants for any crystal symmetry by the least squares method. Several types of extrapolation functions are provided, and these functions can be used either singly or in combination. A complete error treatment is made, including covariances between parameters

    Pack2, a fortran crystallographic molecular packing program

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    This report describes a computer program which performs an analysis of molecular packing in crystals. All space group symmetries are allowed. The packing energy of a molecular crystal structure, known or proposed, may be evaluated using appropriate nonbonded interatomic potential functions

    Dual mode solid state power switch

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    A solid state amplifier has an output transistor stage and an input transistor stage interconnected as a Darlington circuit. An interstage transistor interconnecting the collectors of the two stages of the Darlington circuit is connected with the first stage transistor in a compound configuration. When the load current furnished by the amplifier is less than a predetermined value, the output stage operates as a simple saturated switch with its base drive current flowing through the emitter-base junction of the first stage which produces no collector current because the base-emitter junction of the interstage transistor is reverse-biased. When the load current exceeds said predetermined value, the interstage transistor begins to conduct allowing the input and output stages to operate as a Darlington amplifier and diverting a significant portion of the base drive current of the output transistor back into the load

    Marketing and Survival Strategies of Gulf Seaports: A Preliminary Analysis

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    E. Cameron Williams is an Associate Professor of Marketing, Department of Marketing at Georgia Southern University and Donald R. Gibson is an Assistant Professor of Managment and Marketing at Texas A & I Universit

    Critical Realm-Based Explanatory Case Study Research in Information Systems

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    Critical realism has been proposed as an alternative philosophical paradigm to positivism and interpretivism, but few papers have offered guidelines or suggestions for applying this philosophy to actual research methodologies. This article proposes a set of methodological principles for conducting and evaluating critical realism-based explanatory case study research within the information systems (IS) field. The principles are consistent with the ontological and epistemological assumptions of critical realism, which are discussed along with a brief comparison to the contrasting assumptions from positivism and interpretivism. Examples from published case study articles in the IS research literature are discussed in order to demonstrate each principle in more detail

    Recent Advances and Opportunities for Improving Critical Realism-Based Case Study Research in IS

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    Critical realism (CR) has been proposed as an alternative to positivist and interpretivist research in information systems. In recent years, there have been several articles that describe methodological guidelines for conducting CR-based empirical studies. These guidelines have been used by numerous researchers as the methodological underpinnings for empirical research articles in IS, particularly for case studies. As a result, CR-based research has evolved as these researchers address many of the challenges and issues associated with this approach. In this article, we present a review and synthesis of methodological and recent empirical CR literature. We identify the methodological advances and important gaps in the empirical research and present a set of state-of-the-art recommendations for conducting and evaluating critical realist research studies in IS
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