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21.
Rupendranath Banerjee Anamika Bhattacharya Amiya Kumar Chakraburtty 《Transition Metal Chemistry》1989,14(1):55-57
Summary In the title reaction each mole of N1-phenylbiguanidine, R–HNC(=X)NHC(=NH)NH2 (R=Ph, X=NH), consumes 4 moles of CeIV and produces guanylurea (R=H, X=O), 1,4-benzoquinone and ammonia. On the other hand, the reaction of N1-phenylbiguanidine (pbg) with [MnO4]– proceeds with variable stoicheiometry which depends on reaction conditions. In the case of [MnO4]– no benzoquinone is detected among the reaction products; instead, carbon dioxide, guanylurea, and ammonia were identified. Pbg itself in acid solution slowly hydrolyses to aniline which rapidly reacts with CeIV and [MnO4]–. The kinetics for the reactions of pbg with the oxidants is consistent with the rate law –d[oxidant]/dt=k[pbg].The k values and the corresponding activation enthalpies and entropies for the reaction of bpg with CeIV, [MnO4]–, and CrVI lie within a narrow range. These results are interpreted in terms of rate-determining hydrolysis of pbg in all the three cases. 相似文献
22.
Amiya Mukherjee 《Proceedings Mathematical Sciences》2006,116(4):459-475
This article is an elaboration of a talk given at an international conference on Operator Theory, Quantum Probability, and
Noncommutative Geometry held during December 20–23, 2004, at the Indian Statistical Institute, Kolkata. The lecture was meant
for a general audience, and also prospective research students, the idea of the quantum cohomology based on the Gromov-Witten
invariants. Of course there are many important aspects that are not discussed here.
Dedicated to Professor K B Sinha on the occasion of his 60th birthday 相似文献
23.
24.
We present the finite volume element method (FVEM) for incompressible miscible displacement problems in porous media. Optimal error estimates in L∞(L2) are derived for velocity and concentration. Numerical experiments are also presented. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
25.
Neelima Balkrishen Bhat Amiya Prasad Bhaduri 《Journal of heterocyclic chemistry》1984,21(5):1469-1472
Isoxazolo[5,4-b]quinolines have been prepared by reacting 3-acyl or aroyl-2-chloro-6-alkoxy or 6,7-dialkoxyquinolines with hydroxylamine. The method is of general applicability for obtaining this class of compounds and involves the use of easily available starting materials. 相似文献
26.
27.
Chakraborty M Hsiao FW Naskar B Chang CH Panda AK 《Langmuir : the ACS journal of surfaces and colloids》2012,28(18):7282-7290
Colloidal dispersions of silver bromide (AgBr) in aqueous surfactant medium have been prepared using a surfactant-assisted synthesis approach with hexadecyltrimethylammonium bromide (CTAB). The surfactant acts both as source of bromide ion as well as the stabilizing agent. Upon progressive addition of silver nitrate to aqueous CTAB solution, stable AgBr dispersions were obtained. Formation of surfactant cation (CTA(+)) stabilized AgBr was confirmed by way of XRD, FTIR and NMR studies. Thermal behavior of the isolated nanoparticles was investigated by differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA), where the occurrence of phase transition in the surfactant-stabilized nanoparticles was observed. Kinetics of the particle growth was investigated by dynamic light scattering measurements, which predicted the formation of surfactant bilayered structures associated with the nanoparticles of AgBr. Band gap of the nanoparticles was determined by suitably analyzing the UV-visible spectral data, which concluded that the particles behaved like insulators. Morphology of the particles, studied by TEM measurements, was found to be spherical. Finally, enthalpy of formation of surfactant-stabilized AgBr, determined calorimetrically, was found to be dependent on the concentration of the precursors. 相似文献
28.
P. Danumjaya Amiya K. Pani 《Numerical Methods for Partial Differential Equations》2012,28(4):1227-1251
Mixed finite element methods are applied to a fourth order reaction diffusion equation with different types of boundary conditions. Some a priori bounds are established with the help of Lyapunov functional. The semidiscrete schemes are derived using C0‐piecewise linear finite elements in spatial direction and error estimates are obtained. The semidiscrete problem is then discretized in the temporal direction using backward Euler method and the wellposedness of the completely discrete scheme is discussed. Finally, a priori error estimates are established. While deriving a priori error estimates, Gronwall's lemma is applied and the constants involved in the error bounds do not depend exponentially on $\frac{1}{\gamma}$, where γ is a parameter appeared in the fourth order derivative. © 2011Wiley Periodicals, Inc. Numer Methods Partial Differential Eq, 2012 相似文献
29.
Sarvesh Kumar Neela Nataraj Amiya K. Pani 《Numerical Methods for Partial Differential Equations》2009,25(6):1402-1424
In this article, a one parameter family of discontinuous Galerkin finite volume element methods for approximating the solution of a class of second‐order linear elliptic problems is discussed. Optimal error estimates in L2 and broken H1‐ norms are derived. Numerical results confirm the theoretical order of convergences. © 2009 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq, 2009 相似文献
30.
Amiya Das 《Optical and Quantum Electronics》2018,50(10):376
In this article, we retrieve optical soliton solutions of the perturbed time fractional resonant nonlinear Schrödinger equation having competing weakly nonlocal and full nonlinearity. We study the equation for two different forms of nonlinearity, namely Kerr law and anti-cubic law. The F-expansion method along with fractional complex transformation is used to obtain the optical solitons. Moreover, the existence of these solitons are guaranteed with the constraint relations between the model coefficients and the traveling wave frequency coefficient. 相似文献