350 research outputs found
Remarks on a Decrumpling Model of the Universe
It is argued that when the dimension of space is a constant integer the full
set of Einstein's field equations has more information than the spatial
components of Einstein's equation plus the energy conservation law. Applying
the former approach to the decrumpling FRW cosmology recently proposed, it is
shown that the spacetime singularity cannot be avoided and that turning points
are absent. This result is in contrast to the decrumpling nonsingular spacetime
model with turning points previously obtained using the latter approach.Comment: 8 pages, latex, no figure
Baryogenesis from Long Cosmic Strings
Based on the mechanism of cusp production on long cosmic strings, the baryon
asymmetry caused by cusp annihilation has been calculated. The result is
compatible with observation and stronger than the results from loops.Comment: 7 pages, Latex, (ISTPM) IPM-94-05
A model universe with variable dimension: Expansion as decrumpling
We propose a model universe, in which the dimension of the space is a
continuous variable, which can take any real positive number. The dynamics
leads to a model in which the universe has no singularity. The difference
between our model and the standard Friedman-Robertson-Walker models become
effective for times much before the presently accepted age of the universe.Comment: 12 pages, emTeX version 3.0, no figure
Prediction of Natural Frequencies of Laminated Curved Panels Using Refined 2-D Theories in the Spectral Collocation Method
This paper presents a versatile and efficientmodeling and solution framework for free vibration analysis of composite laminated cylindrical and spherical panels modeled according to two-dimensional equivalent singlelayer and layerwise theories of variable order.Aunified formulation of the equations of motion is adopted which can be used for both thin and thick structures. The discretization procedure is based on the spectral collocation method and is presented in a compact matrix form which can be directly and easily implemented. The convergence and accuracy of the proposed approach is evaluated for panels having different boundary conditions, thickness and shallowness ratios, and lamination layups
CBProf: Customisable Blockchain-as-a-Service Performance Profiler in Cloud Environments
Blockchain technologies, e.g., Hyperledger Fabric and Sawtooth, have been evolving rapidly during past years and enable potential decentralised innovations in a substantial amount of business applications, e.g. crowd journalism, car-sharing and energy trading. The development of decentralised business applications has to face challenges in selecting suitable blockchain technologies, customising network protocols among distributed peers, and optimising system performance to meet application requirements. Also, manually testing and comparing those different technologies are time-consuming. Therefore, an effective tool is needed for profiling the performance characteristics of blockchain services in different cloud environments. In this paper, we present the Customisable Blockchain-as-a-Service Performance Profiler (CBProf), a tool we developed for automating blockchain deployment and performance profiling in cloud environments. We also provide the implementation and functionality demonstration of this tool
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