76,887 research outputs found

    Topology and Strings: Topics in N=2N=2

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    A review on topological strings and the geometry of the space of two dimensional theories. (Lectures given by C. Gomez at the Enrico Fermi Summer School, Varenna, July 1994)Comment: 61 pages, late

    A Note on the String Analog of N=2N=2 Super-Symmetric Yang-Mills

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    A connection between the conifold locus of the type II string on the W P112264W\:P_{11226}^4 Calabi-Yau manifold and the geometry of the quantum moduli of N=2N = 2 SU(2)SU(2) super Yang-Mills is presented. This relation is obtained from the anomalous behaviour of the SU(2)SU(2) super Yang-Mills special coordinates under SS-duality transformation in Sl(2;Z)/Γ2Sl(2;Z) / \Gamma_2.Comment: 7 pages, Late

    Critical Service Learning

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    Service Learning Initiative for Community Engagement in Sociology (SLICES) is a critical, research-focused, community-based, leadership and knowledge project. By engaging in Community Based Participatory Action Research Projects (CBPAR) students have an opportunity to work multiple semesters, if they choose, to develop research skills, serve in leadership roles, serve and collaborate with local organization, and engage in professional development.https://digitalscholarship.unlv.edu/btp_expo/1042/thumbnail.jp

    Unit Roots, Level Shifts and Trend Breaks in Per Capita Output: A Robust Evaluation

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    Determining whether per capita output can be characterized by a stochastic trend is complicated by the fact that infrequent breaks in trend can bias standard unit root tests towards non-rejection of the unit root hypothesis. The bulk of the existing literature has focused on the application of unit root tests allowing for structural breaks in the trend function under the trend stationary alternative but not under the unit root null. These tests, however, provide little information regarding the existence and number of trend breaks. Moreover, these tests suffer from serious power and size distortions due to the asymmetric treatment of breaks under the null and alternative hypotheses. This paper estimates the number of breaks in trend employing procedures that are robust to the unit root/stationarity properties of the data. Our analysis of the per-capita GDP for OECD countries thereby permits a robust classification of countries according to the "growth shift", "level shift" and "linear trend" hypotheses. In contrast to the extant literature, unit root tests conditional on the presence or absence of breaks do not provide evidence against the unit root hypothesis.growth shift, level shift, structural change, trend breaks, unit root.

    Quantum chemical calculations for polymers and organic compounds

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    The relativistic effects of the orbiting electrons on a model compound were calculated. The computational method used was based on 'Modified Neglect of Differential Overlap' (MNDO). The compound tetracyanoplatinate was used since empirical measurement and calculations along "classical" lines had yielded many known properties. The purpose was to show that for large molecules relativity effects could not be ignored and that these effects could be calculated and yield data in closer agreement to empirical measurements. Both the energy band structure and molecular orbitals are depicted
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