69,503 research outputs found
Inexpensive check valve is installed in standard AN fittings
Check valve with a cylindrical flanged tube body is used in standard AN fittings. The valve also has an easily removable spring-loaded piston
Skinner-Rusk approach to time-dependent mechanics
The geometric approach to autonomous classical mechanical systems in terms of
a canonical first-order system on the Whitney sum of the tangent and cotangent
bundle, developed by R. Skinner and R. Rusk, is extended to the time-dependent
framework
Possible cosmological implications in electrodynamics due to variations of the fine structure constant
Astronomical observations are suggesting that the fine structure constant
varies cosmologically. We present an analysis on the consequences that these
variations might induce on the electromagnetic field as a whole. We show that
under these circumstances the electrodynamics in vacuum could be described by
two fields, the ``standard'' Maxwell's field and a new scalar field. We provide
a generalised Lorentz force which can be used to test our results
experimentally.Comment: 7 pages, no figures. Accepted for publication in Rev. Mex. Fis. (Some
extra information included, references added and small corrections made to
the original version
On the scalar curvature of constant mean curvature hypersurfaces in space forms
In this paper we study the behavior of the scalar curvature of a complete
hypersurface immersed with constant mean curvature into a Riemannian space form
of constant curvature, deriving a sharp estimate for the infimum of . Our
results will be an application of a weak Omori-Yau maximum principle due to
Pigola, Rigoli and Setti \cite{PRS}.Comment: Final version (August 2009). To appear in Journal of Mathematical
Analysis and Applications. Dedicated to Professor Marcos Dajczer on the
occasion of his 60th birthda
Working with OpenCL to Speed Up a Genetic Programming Financial Forecasting Algorithm: Initial Results
The genetic programming tool EDDIE has been shown to be a successful financial forecasting tool, however it has suffered from an increase in execution time as new features have been added. Speed is an important aspect in financial problems, especially in the field of algorithmic trading, where a delay in taking a decision could cost millions. To offset this performance loss, EDDIE has been modified to take advantage of multi-core CPUs and dedicated GPUs. This has been achieved by modifying the candidate solution evaluation to use an OpenCL kernel, allowing the parallel evaluation of solutions. Our computational results have shown improvements in the running time of EDDIE when the evaluation was delegated to the OpenCL kernel running on a multi-core CPU, with speed ups up to 21 times faster than the original EDDIE algorithm. While most previous works in the literature reported significantly improvements in performance when running an OpenCL kernel on a GPU device, we did not observe this in our results. Further investigation revealed that memory copying overheads and branching code in the kernel are potentially causes of the (under-)performance of the OpenCL kernel when running on the GPU device
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