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Search Results: 1 - 10 of 130771 matches for " V Chaturvedi "
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Modelling and analysis of abrasive wear performance of composites using Taguchi approach
SS Mahapatra, V Chaturvedi
International Journal of Engineering, Science and Technology , 2009,
Abstract: Short lignocellulosic fibres are extensively used these days as reinforcing materials in many thermoset and thermoplastic matrices due to their low cost, lower density than inorganic fibres, environmentally-friendliness, and the relative ease of obtaining them. Such fibres would not contribute to the wear and tear of polymer processing equipment and may not suffer from size reduction during processing, both of which occur when inorganic fibres or fillers are used. These fibres can also be easily moulded to wide variety of shapes during composite preparation. However, modelling and analysis of behaviour of composites reinforced with short fibre drawn from agricultural resources has been studied to a limited extent. Particularly, the optimum size of short fibre just capable of transferring the load and flexibility during preparation has not been studied through a simple systematic modelling approach due to the complexity involved in its modelling aspect. To this end, an attempt has been made in this work to study the abrasive behaviour of untreated sugarcane fibre reinforced composites in a simplified manner and develop empirical model. The effect of various test parameters and their interactions have been studied using Taguchi method to find out optimal parameter setting for minimum wear (weight loss). It has been observed that fibre length plays a major role in wear phenomenon. The length of the fibre has been optimized using a popular evolutionary technique known as particle swarm optimization (PSO) and neural network. The study recommends that fibre length should be 7-8 mm for minimum wear of the composites.
Isolation of a strain of Pseudomonas putida capable of metabolizing anionic detergent sodium dodecyl sulfate (SDS)
V Chaturvedi,A Kumar
Iranian Journal of Microbiology , 2011,
Abstract: Background and objectives: Sodium Dodecyl Sulfate (SDS) is one of the most widely used anionic detergents. The present study deals with isolation and identification of SDS-degrading bacteria from a detergent contaminated pond situated in Varanasi city, India."nMaterials and Methods: Employing enrichment technique in minimal medium (PBM), SDS-degrading bacteria were isolated from pond water sample. Rate of degradation of SDS was studied in liquid PBM and also degradation of different concentrations of SDS was also studied to find out maximum concentration of SDS degraded by the potent isolates. Alkyl sulfatase activity (key enzyme in SDS degradation) was estimated in crude cell extracts and multiplicity of alkyl sulfatase was studied by Native PAGE Zymography. The potent isolate was identified by 16S rRNA sequence analysis."nResults: Using enrichment technique in minimal medium containing SDS as a sole carbon source, initially three SDS degrading isolates were recovered. However, only one isolate, SP3, was found to be an efficient degrader of SDS. It was observed that this strain could completely metabolize 0.1% SDS in 16 h, 0.2% SDS in 20 h and 0.3% SDS in 24 h of incubation. Specific activity of alkyl sulfatase was 0.087±0.004 μmol SDS/mg protein/min and Native PAGE Zymography showed presence of alkyl sulfatase of Rf value of 0.21. This isolate was identified as Pseudomonas putida strain SP3."nConclusion: This is the report of isolation of SDS-degrading strain of P. putida, which shows high rate of SDS degradation and can degrade up to 0.3% SDS. It appears that this isolate can be exploited for bioremediation of this detergent from water systems.
Soft tissue swelling: cytology comes to rescue.
Chaturvedi S,Arora V
Journal of Postgraduate Medicine , 2001,
Grand canonical partition functions for multi level para Fermi systems of any order
S. Chaturvedi,V. Srinivasan
Physics , 1996, DOI: 10.1016/S0375-9601(96)00826-2
Abstract: A general formula for the grand canonical partition function for a para Fermi system of any order and of any number of levels is derived.
An interpolation between Bose, Fermi and Maxwell-Boltzmann statistics based on Jack Polynomials
S. Chaturvedi,V. Srinivasan
Physics , 1996,
Abstract: An interpolation between the canonical partition functions of Bose, Fermi and Maxwell-Boltzmann statistics is proposed. This interpolation makes use of the properties of Jack polynomials and leads to a physically appealing interpolation between the statistical weights of the three statistics. This, in turn, can be used to define a new exclusion statistics in the spirit of the work of Haldane.
Role of the family in drug abuse.
Kartikeyan S,Chaturvedi R,Bhalerao V
Journal of Postgraduate Medicine , 1992,
Abstract: A simple random survey of 9863 population out of the total 70,000 population is one slum pocket of Bombay revealed drug dependence in 104 persons. Out of 104, 83.65% smoked ′brown sugar′ 10.68% used cannabis and 5.77% opium. Most of the addicts (95.2%) belonged to large families. Family history of alcoholism and drug abuse was present in 41.35%. Parental deprivation was additional contributing factor in 30.7%.
Eigenstates of linear combinations of two boson creation and annihilation operators : An algebraic approach
P. Shanta,S. Chaturvedi,V. Srinivasan
Physics , 1996, DOI: 10.1142/S021773239600237X
Abstract: Eigenstates of the linear combinations $a^2+\beta a^{\dagger2}$ and $ab+\beta a^\dagger b^\dagger$ of two boson creation and annihilation operators are presented. The algebraic procedure given here is based on the work of Shanta et al. [Phys. Rev. Lett. {\bf 72}, 1447, 1994] for constructing eigenstates of generalized annihilation operators.
Quantum phase space distributions in thermofield dynamics
S. Chaturvedi,V. Srinivasan,G. S. Agarwal
Physics , 1998, DOI: 10.1088/0305-4470/32/10/009
Abstract: It is shown that the the quantum phase space distributions corresponding to a density operator $\rho$ can be expressed, in thermofield dynamics, as overlaps between the state $\mid \rho >$ and "thermal" coherent states. The usefulness of this approach is brought out in the context of a master equation describing a nonlinear oscillator for which exact expressions for the quantum phase distributions for an arbitrary initial condition are derived.
A new orthogonalization procedure with an extremal property
S. Chaturvedi,A. K. Kapoor,V. Srinivasan
Physics , 1998, DOI: 10.1088/0305-4470/31/19/002
Abstract: Various methods of constructing an orthonomal set out of a given set of linearly independent vectors are discussed. Particular attention is paid to the Gram-Schmidt and the Schweinler-Wigner orthogonalization procedures. A new orthogonalization procedure which, like the Schweinler- Wigner procedure, is democratic and is endowed with an extremal property is suggested.
Congruences and Canonical Forms for a Positive Matrix: Application to the Schweinler-Wigner Extremum Principle
R. Simon,S. Chaturvedi,V. Srinivasan
Physics , 1998, DOI: 10.1063/1.532913
Abstract: It is shown that a $N\times N$ real symmetric [complex hermitian] positive definite matrix $V$ is congruent to a diagonal matrix modulo a pseudo-orthogonal [pseudo-unitary] matrix in $SO(m,n)$ [ $SU(m,n)$], for any choice of partition $N=m+n$. It is further shown that the method of proof in this context can easily be adapted to obtain a rather simple proof of Williamson's theorem which states that if $N$ is even then $V$ is congruent also to a diagonal matrix modulo a symplectic matrix in $Sp(N,{\cal R})$ [$Sp(N,{\cal C})$]. Applications of these results considered include a generalization of the Schweinler-Wigner method of `orthogonalization based on an extremum principle' to construct pseudo-orthogonal and symplectic bases from a given set of linearly independent vectors.
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