46,134 research outputs found
NASTRAN static and buckling analysis - comparison with other large-capacity programs
A square plate with clamped edges under a concentrated load was modeled using NASTRAN and ASKA finite element computer programs. Deflections were computed for various width-to-thickness ratios (b/t) of the plate element, and were compared against the classical theory to determine the b/t limitations. A cylinder with simply supported ends was modeled using NASTRAN and STAGS computer programs for buckling analysis. The models were subjected to a uniform radial pressure loading. Several parameters were changed, and the effects of those variations are presented. Utilizing these data, a model which will produce results comparable to published empirical data can be constructed and processed for a minimized cost
Stability analysis for cosmological models in gravity using dynamical system analysis
Modified gravity theories have received increased attention lately to
understand the late time acceleration of the universe. This viewpoint
essentially modifies the geometric components of the universe. Among numerous
extension to Einstein's theory of gravity, theories which include higher order
curvature invariant, and specifically the class of theories, have
received several acknowledgments. In our current work we try to understand the
late time acceleration of the universe by modifying the geometry of the space
and using dynamical system analysis. The use of this technique allows to
understand the behavior of the universe under several circumstances. Apart from
that we study the stability properties of the critical point and acceleration
phase of the universe which could then be analyzed with observational data. We
consider a particular model with for the study. As a first case we consider the matter and
radiation component of the universe with an assumption of no interaction
between them. Later, as a second case we take matter, radiation and dark energy
(cosmological constant) where study on effects of linear, non-linear and no
interaction between matter and dark energy is considered and results have been
discussed in detail.Comment: 16 pages and 10 figures, published in EPJ
Design Architecture-Based on Web Server and Application Cluster in Cloud Environment
Cloud has been a computational and storage solution for many data centric
organizations. The problem today those organizations are facing from the cloud
is in data searching in an efficient manner. A framework is required to
distribute the work of searching and fetching from thousands of computers. The
data in HDFS is scattered and needs lots of time to retrieve. The major idea is
to design a web server in the map phase using the jetty web server which will
give a fast and efficient way of searching data in MapReduce paradigm. For real
time processing on Hadoop, a searchable mechanism is implemented in HDFS by
creating a multilevel index in web server with multi-level index keys. The web
server uses to handle traffic throughput. By web clustering technology we can
improve the application performance. To keep the work down, the load balancer
should automatically be able to distribute load to the newly added nodes in the
server
Qualitative behavior of cosmological models combining various matter fields
The late time accelerated expansion of the universe can be realized using
scalar fields with given self-interacting potentials. Here we consider a
straightforward approach where a three cosmic fluid mixture is assumed. The
fluids are standard matter perfect fluid, dark matter, and a scalar field with
the role of dark energy. A dynamical system analysis is developed in this
context. A central role is played by the equation of state which
determines the acceleration phase of the models. Determining the domination of
a particular fluid at certain stages of the universe history by stability
analysis allows, in principle, to establish the succession of the various
cosmological eras.Comment: 18 pages, 7 figures, accepted in IJMP
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