A theorem of Gromov says that a complete finite volume Riemannian manifold of bounded negative curvature is the interior of a compact manifold with boundary. If, in addition, the curvature is bounded away from zero then the boundary is an aspherical manifold with virtually nilpotent fundamental group. I will discuss examples showing this is no longer true if the curvature is allowed to approach...

Corresponding Author: Toan Phan Thanh Hanoi National University of Education, Ha Noi, Vietnam Email: [email protected] Abstract: Although workflow scheduling problem has been discussed by many researchers, a few efficient solutions have been introduced for Cloud computing. In this article, we present LPSO, a novel algorithm for workflow scheduling. Based on the Particle Swarm Optimization meth...

Author Contributions:Drs Hubiche and Valério had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: Hubiche, Valério, del Giudice. Acquisition, analysis, or interpretation of data: All authors. Drafting of the manuscript: Hubiche, Valério, del Giudice. Critical revision of the manuscript...

Wire-coating flow is simulated, involving polymer melt coatings and tube-tooling process design. A finite element method is employed, based on a semi-implicit time-stepping Taylor-Galerkin/pressure-correction scheme. The exponential Phan-Thien/Tanner model is used in its multi-mode form to represent a high-density polyethelyne (HDPE) polymer. Both shear-thinning and elongation-softening propert...

M. A. Shay, C. C. Haggerty, T. D. Phan, J. F. Drake, P. A. Cassak, P. Wu, M. Oieroset, M. Swisdak, and K. Malakit Bartol Research Institute, Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA Space Sciences Laboratory, University of California, Berkeley, California 94720, USA Institute for Research in Electronics and Applied Physics, University of Maryland,...

A thin filament model is used to analyze the stability of a viscoelastic thread subject to uniaxial stretching. Linear stability analysis is carried out for a number of different constitutive models, namely the Johnson–Segalman, Giesekus, Phan–Thien Tanner, and FENE–CR. Our analysis shows that stability is controlled by the competing effects of surface tension which is destabilizing and axial n...

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Conversion of tryptophan -to niacin in male weanling albino rats, fed high fat and high fat-high protein, was studied. High fat diet suppressed niacin biosynthesis from administered trypto phan. High protein along with high fat was found to overcome the deleterious effect of high fat on the conversion of tryptophan to niacin. Prolonged feeding of high fat decreased urinary , blood and tissue le...

Topic models are a popular method for modeling the term frequency occurrences in documents. The fitted model allows to better estimate the similarity between documents as well as between a set of specified keywords using an additional layer of latent variables which are referred to as topics. The R package topicmodels provides basic infrastructure for fitting topic models based on data structur...