排序方式: 共有45条查询结果,搜索用时 265 毫秒
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Biswanath Das Harish Holla Gurram Mahender Joydeep Banerjee Majjigapu Ravinder Reddy 《Tetrahedron letters》2004,45(39):7347-7350
Treatment of aldoximes with activated alkenes in the presence of diacetoxy iodobenzene (DIB) afforded isoxazolines in high yields. The method has been applied for the preparation of polyfunctional isoxazolines from Baylis-Hillman adducts. 相似文献
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Two new algorithms based on cubic spline function technique are proposed for solving Burgers' equation in one space variable and coupled Burgers' equation in two space variables. The algorithms have been analysed for their stability and convergence. Two test examples have been solved for illustrating the merits of the proposed numerical method. The method can be extended for solving non-linear problems arising in mechanics and other areas. 相似文献
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Let k be an algebraically closed field and X a smooth projective variety defined over k. Let EG be a principal G–bundle over X, where G is an algebraic group defined over k, with the property that for every smooth curve C in X the restriction of EG to C is the trivial G–bundle. We prove that the principal G–bundle EG over X is trivial. We also give examples of nontrivial principal bundle over a quasi-projective variety Y whose restriction to every smooth curve in Y is trivial. 相似文献
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Yogish I. Holla 《Proceedings Mathematical Sciences》2000,110(3):233-261
In this paper we use Weil conjectures (Deligne’s theorem) to calculate the Betti numbers of the moduli spaces of semi-stable
parabolic bundles on a curve. The quasi parabolic analogue of the Siegel formula, together with the method of HarderNarasimhan
filtration gives us a recursive formula for the Poincaré polynomials of the moduli. We solve the recursive formula by the
method of Zagier, to give the Poincaré polynomial in a closed form. We also give explicit tables of Betti numbers in small
rank, and genera. 相似文献
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Benzimidazoles have been efficiently synthesized in high yields by treatment of 1,2-phenylenediamine with aldehydes using (bromodimethyl)sulfonium bromide at room temperature. 相似文献
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Biswanath Das Katta Venkateswarlu Maddeboina Krishnaiah Harish Holla 《Tetrahedron letters》2006,47(43):7551-7556
A facile and versatile method for the chemoselective Boc protection of amines has been developed by a treatment with (Boc)2O in the presence of sulfonic-acid-functionalized silica as a catalyst. The method is general for the preparation of N-Boc derivatives of aliphatic (acyclic and cyclic), aromatic, and heteroaromatic amines; primary and secondary amines; aminols, amino-esters; and sulfonamides. The catalyst works under heterogeneous conditions and can be recycled. 相似文献
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