17,961 research outputs found
Some theorems on stability of discrete circulatory systems
Stability theorems established for static and dynamic losses in discrete, linear, elastic system
Elasticity-mediated self-organization and colloidal interactions of solid spheres with tangential anchoring in a nematic liquid crystal
Using laser tweezers and fluorescence confocal polarizing microscopy, we
study colloidal interactions of solid microspheres in the nematic bulk caused
by elastic distortions around the particles with strong tangential surface
anchoring. The particles aggregate into chains directed at about 30 degrees to
the far field director and, at higher concentrations, form complex kinetically
trapped structures. We characterize the distance and angular dependencies of
the colloidal interaction forces.Comment: 6 pages, 5 figure
Destabilizing effect of velocity-dependent forces in nonconservative continuous systems Technical report no. 65-4
Velocity dependent force destabilizing effect in cantilevered continuous pipe conveying fluid at constant velocit
Anti-isospectral Transformations, Orthogonal Polynomials and Quasi-Exactly Solvable Problems
We consider the double sinh-Gordon potential which is a quasi-exactly
solvable problem and show that in this case one has two sets of Bender-Dunne
orthogonal polynomials . We study in some detail the various properties of
these polynomials and the corresponding quotient polynomials. In particular, we
show that the weight functions for these polynomials are not always positive.
We also study the orthogonal polynomials of the double sine-Gordon potential
which is related to the double sinh-Gordon case by an anti-isospectral
transformation. Finally we discover a new quasi-exactly solvable problem by
making use of the anti-isospectral transformation.Comment: Revtex, 19 pages, No figur
Modified SPLICE and its Extension to Non-Stereo Data for Noise Robust Speech Recognition
In this paper, a modification to the training process of the popular SPLICE
algorithm has been proposed for noise robust speech recognition. The
modification is based on feature correlations, and enables this stereo-based
algorithm to improve the performance in all noise conditions, especially in
unseen cases. Further, the modified framework is extended to work for
non-stereo datasets where clean and noisy training utterances, but not stereo
counterparts, are required. Finally, an MLLR-based computationally efficient
run-time noise adaptation method in SPLICE framework has been proposed. The
modified SPLICE shows 8.6% absolute improvement over SPLICE in Test C of
Aurora-2 database, and 2.93% overall. Non-stereo method shows 10.37% and 6.93%
absolute improvements over Aurora-2 and Aurora-4 baseline models respectively.
Run-time adaptation shows 9.89% absolute improvement in modified framework as
compared to SPLICE for Test C, and 4.96% overall w.r.t. standard MLLR
adaptation on HMMs.Comment: Submitted to Automatic Speech Recognition and Understanding (ASRU)
2013 Worksho
A Study on Impact Resistance of Glass Fibre Reinforced Vinylester Composites against ballistic Projectiles
Glass fibre reinforced vinylester laminates show very high impact resistance, the charpy impact strength measuring upto 576 kJ/m'. Void-free laminates prepared from E-glass fibre-reinforcement and vinylester resin. matrix combined with resin bonded alumina sheets as facing have been subjected to high velocity impact of 7.62 mm bullets fired from a distance of 10 meters. Glass fibre and Kevlar-29 fibre reinforced vinylester laminates with a thickness less than 10 mm (areal density - 14.24 kg/ 111'.) have been tested against 1.1 g fragment simulated projectiles (FSP) in the form of steel balls and 9 mm carbine fire. The laminates thus tested withstood the bullets
without any bulge at the back. The possible mechanism of the hyper velocity impact resistance of the FRP laminates has been discussed
Technologies for High Power Density Diesel Engines
The engines used in armoured fighting vehicles have to be compact, light in weight, efficient and reliable. In order to achieve a compact engine design, a complete understanding of all the factors affecting the engine performance is needed. However, it is important to note that the performance of the engine cannot be compromised in the pursuit of compactness. The aim of this paper is to classify systematically various broad areas affecting the engine’s power to weight and power to volume ratio and discuss respective current technologies available. This paper explores the possibility of size and weight reduction and efficiency enhancement of diesel engines by the use of various methods like engine friction reduction, better thermal management, high injection pressure, and turbocharging. Achieving high engine speeds and high BMEP will be the means of achieving high power density. The effects of engine configuration and technologies on compactness are also discussed. Finally, the configuration of a new engine and its design aspects, incorporating all the aforementioned concepts is discusse
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