179,784 research outputs found
Tendenze odierne: West, Brandom, Haack, Shusterman
No full textIl capitolo esamina il contributo di Brandom, West, Schusterman and Haack al pensiero pragmatista
Vilsmeier-Haack reaction on quinaldines
No full text2069-2073The study of the Vilsmeier-Haack reaction
on 4-hydroxyquinaldines resulted with the preparation of rarely existing
4-chloro-3-formyl-2(vinyl-1-ol)-quinolines
Conservative Deterministic Spectral Boltzmann Solver Near The Grazing Collisions Limit
No full textWe present new results building on the conservative deterministic spectral method for the space homogeneous Boltzmann equation developed by Gamba and Tharkabhushaman. This approach is a two-step process that acts on the weak form of the Boltzmann equation, and uses the machinery of the Fourier transform to reformulate the collisional integral into a weighted convolution in Fourier space. A constrained optimization problem is solved to preserve the mass, momentum, and energy of the resulting distribution. Within this framework we have extended the formulation to the case of more general case of collision operators with anisotropic scattering mechanisms, which requires a new formulation of the convolution weights. We also derive the grazing collisions limit for the method, and show that it is consistent with the Fokker-Planck-Landau equations as the grazing collisions parameter goes to zero.Mathematic
Image of photograph of a framed photograph featuring (l to r) Bill Hack [Haack], Johnny Rogers, Slim Darnwood, Jack Wise, 1943.
No full textImage of photograph of a framed photograph hanging in the San Jacinto dining hall, featuring (l to r) Bill Hack [Haack], Johnny Rogers, Slim Darnwood, Jack Wise. Photographer of framed photograph unknown, 194
Photograph of a framed photograph featuring (l to r) Bill Haack, Johnny Rodgers, Meryl Rowe, Rex Weeks, Norm Wilson, circa 1942.
No full textPhotograph of a framed photograph hanging in the San Jacinto dining hall, featuring (l to r) Bill Haack, Johnny Rodgers, Meryl Rowe [correct spelling Mearl Row], Rex Weeks, Norm Wilson. Photographer of framed photograph unknown, circa 1942
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
A Fast Conservative Spectral Solver For The Nonlinear Boltzmann Collision Operator
No full textWe present a conservative spectral method for the fully nonlinear Boltzmann collision operator based on the weighted convolution structure in Fourier space developed by Gamba and Tharkabhushnanam.. This method can simulate a broad class of collisions, including both elastic and inelastic collisions as well as angularly dependent cross sections in which grazing collisions play a major role. The extension presented in this paper consists of factorizing the convolution weight on quadrature points by exploiting the symmetric nature of the particle interaction law, which reduces the computational cost and memory requirements of the method to O(M(2)N(4)logN) from the O(N-6) complexity of the original spectral method, where N is the number of velocity grid points in each velocity dimension and M is the number of quadrature points in the factorization, which can be taken to be much smaller than N. We present preliminary numerical results.Mathematic
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Ring opening of tetrazole via unusual vilsmeir-haack reaction forming novel triazenes
No full textN-Substituted tetrazole was attempted to formylate which led to the formation of a novel triazene by opening of tetrazole ring via unusual Vilsmeir-Haack reaction. The formed product was proved by spectral analyses and X-Ray diffraction studies
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