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Search Results: 1 - 10 of 338059 matches for " U. S. Mallik "
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Corrosion Behavior of Cu-Zn-Ni Shape Memory Alloys  [PDF]
S. Sathish, U. S. Mallik, T. N. Raju
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2013, DOI: 10.4236/jmmce.2013.12010
Abstract:

Four shape memory alloys of Cu-Zn-Ni, in the range of 35-55 wt% of Cu, 43-60 wt% Zn and 2-9 wt% Ni, were prepared by ingot metallurgy route in an induction furnace under an inert atmosphere. The shape memory effect was tested by bend test. The alloys were further tested for its corrosion behavior in fresh water, Hank’s solution and sea water. From the results it was observed that the alloys exhibit high corrosion resistance in fresh water when compared to Hank’s solution and sea water. And it was also observed that the alloys exhibit better corrosion resistance in Hank’s solution than in sea water.

Microstructure and Shape Memory Effect of Cu-Zn-Ni Shape Memory Alloys  [PDF]
Sathish S, U. S. Mallik, T. N. Raju
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2014, DOI: 10.4236/jmmce.2014.22011
Abstract: The microstructure, martensitic transformation behavior and shape memory effect of Cu-Zn-Ni shape memory alloy have been studied by X-ray diffraction (XRD), optical microscopy (OM) and differential scanning calorimetry (DSC). The results show that the recrystallization occurs in the hot-rolled Cu-Zn-Ni alloy by annealing at 800℃ and alloy is primarily composed of martensite. A reverse martensite transformation temperature higher than 100℃ upon heating has been detected. The alloys exhibit good ductility and shape memory effect (SME). The results obtained are discussed in detail.
Massive States in Chiral Perturbation Theory
S. Mallik
Physics , 1994, DOI: 10.1007/BF01579813
Abstract: It is shown that the chiral nonanalytic terms generated by $\Delta_{33}$ resonance in the nucleon self-energy is reproduced in chiral perturbation theory by perturbing appropriate local operators contained in the pion-nucleon effective Lagrangian itself.
Operator product expansion at finite temperature
S. Mallik
Physics , 1997, DOI: 10.1016/S0370-2693(97)01335-X
Abstract: We extend an earlier, configuration space method to find the Wilson coefficients of operators appearing in the short distance expansion of thermal correlation functions of different quark bilinears. Considering all the different correlation functions, there arise, up to dimension four, two new operators, in addition to the two appearing already in the vacuum correlation functions. They would contribute substantially to the QCD sum rules, when the temperature is not too low.
Scattering amplitude and shift in self-energy in medium
S. Mallik
Physics , 2001, DOI: 10.1007/s100520200909
Abstract: Two simple proofs are presented for the first order virial expansion of the self-energy of a particle moving through a medium, characterised by temperature and/or chemical potential(s). One is based on the virial expansion of the self-energy operator itself, while the other is on the analysis of its Feynman diagrams in configuration space.
Nucleon propagation through nuclear matter in chiral effective field theory
Mallik, S.;Mishra, Hiranmaya
High Energy Physics - Phenomenology , 2007, DOI: 10.1140/epjc/s10052-007-0272-0
Abstract: We treat the propagation of nucleon in nuclear matter by evaluating the ensemble average of the two-point function of nucleon currents in the framework of the chiral effective field theory. We first derive the effective parameters of nucleon to one loop. The resulting formula for the effective mass was known previously and gives an absurd value at normal nuclear density. We then modify it following Weinberg's method for the two-nucleon system in the effective theory. Our results for the effective mass and the width of nucleon are compared with those in the literature.
PHYTOCHEMICAL AND PRELIMINARY TOXICITY STUDY OF SESBANIA GRANDIFLORA (LINN.) FLOWERS
Arunabha Mallik,S. Nayak
International Journal of Biomedical and Advance Research , 2011, DOI: 10.7439/ijbar.v2i11.200
Abstract: Sesbania grandiflora Linn. (Family : Fabaceae) is widespread distributed West Bengal, Assam, Karnataka and North-Eastern. The present study intended with various phytochemical screening and toxicity studies were carried out on the flowers of Sesbania grandiflora. Preliminary phytochemical evalution of the methanolic and aqueous extracts of revealed that presence of corbohydrate, proteins, amino acids, saponins, flavonoids, alkaloids, tannins and glycosides.The acute toxicity study were performed to determined LD50 - of 99% methanolic extract 20-40 mg/kg, 70% methanolic extract100-200 mg/kg and aqueous extract250-500 mg/kg.
Baryogenesis and damping in nonminimal electroweak models
A. Kundu,S. Mallik
Physics , 1994,
Abstract: We study the effect of damping on the generation of baryon asymmetry of the Universe in the standard model of the eletroweak theory with simple extensions of the Higgs sector. The propagation of quarks of masses up to about 5 GeV are considered, taking into account their markedly different dispersion relations due to interaction with the hot electroweak plasma. It is argued that the contribution of the b quark can be comparable to that of the t quark calculated earlier.
Baryogenesis at the Electroweak Scale
A. Kundu,S. Mallik
Physics , 1994, DOI: 10.1007/BF01620729
Abstract: The generation of the baryon asymmetry of the universe is considered in the standard model of the electroweak theory with simple extensions of the Higgs sector. The propagation of quarks of masses up to about 5 GeV are considered, taking into account their markedly different dispersion relations due to propagation through the hot electroweak plasma. It is shown that the contribution of these lighter quarks to the baryon asymmetry can be comparable to that for the t quark considered earlier.
Absence of second order phase transition in $ λφ^4$ theory
S. Mallik,K. Mukherjee
Physics , 1996,
Abstract: We calculate the self-energy at finite temperature in scalar $\lambda\phi ^4$ theory to second order in a modified perturbation expansion. Using the renormalisation group equation to tame the logarithms in momentum, it gives an equation to determine the critical temperature. Due to the infrared freedom of the theory, this equation is satisfied, irrespective of the value of the temperature. We conclude that there is no second order phase transition in this theory.
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