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排序方式: 共有110条查询结果,搜索用时 15 毫秒
71.
Meera Mehta Dr. Michael H. Holthausen Ian Mallov Dr. Manuel Pérez Dr. Zheng‐Wang Qu Prof. Dr. Stefan Grimme Prof. Dr. Douglas W. Stephan 《Angewandte Chemie (International ed. in English)》2015,54(28):8250-8254
Ketones are efficiently deoxygenated in the presence of silane using highly electrophilic phosphonium cation (EPC) salts as catalysts, thus affording the corresponding alkane and siloxane. The influence of distinct substitution patterns on the catalytic effectiveness of several EPCs was evaluated. The deoxygenation mechanism was probed by DFT methods. 相似文献
72.
Meera Thillainatesan 《The Ramanujan Journal》2006,11(1):111-133
In this paper we will study the main term of mixed moments of L-functions associated to holomorphic cusp forms of integral
weight on congruence subgroups of odd and squarefree level.
2000 Mathematics Subject Classification Primary—11F67, 11M41, 11F30 相似文献
73.
Meera Thillainatesan 《Journal of Number Theory》2008,128(4):759-780
The full multiple Dirichlet series of an automorphic cusp form is defined, in classical language, as a Dirichlet series of several complex variables over all the Fourier coefficients of the cusp form. It is different from the L-function of Godement and Jacquet, which is defined as a Dirichlet series in one complex variable over a one-dimensional array of the Fourier coefficients. In GL(2) and GL(3), the two notions are simply related. In this paper, we construct a kernel function that gives the full multiple Dirichlet series of automorphic cusp forms on GL(n,R). The kernel function is a new Poincaré series. Specifically, the inner product of a cusp form with this Poincaré series is the product of the full multiple Dirichlet series of the form times a function that is essentially the Mellin transform of Jacquet's Whittaker function. In the proof, the full multiple Dirichlet series is produced by applying the Lipschitz summation formula several times and by an integral which collapses the sum over SL(n−1,Z) in the Fourier expansion of the cusp form. 相似文献
74.
A series of intramolecular complexes with Schiff base ligands having N∩S and N∩O donor systems were synthesized in an open vessel under microwave irradiation (MWI) using a domestic microwave oven. The reaction time has been brought down from hours to seconds with improved yield as compared with the conventional heating. The complexes have been characterized on the basis of elemental analysis, conductance measurements and spectroscopic analysis. Based on the IR, 1H NMR, 11B NMR and 13C NMR spectroscopic studies, a tetrahedral geometry has been proposed for the resulting complexes. The compounds have been screened in vitro against bacteria and fungi to test their antimicrobial property and in vivo in male albino rats to test their antifertility property. The testicular sperm density, motility and density of cauda epididymal spermatozoa along with biochemical parameters of reproductive organs have been examined and discussed. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
75.
Geeta Patkare Muhammed Shafeeq Dr. Arijit Sengupta Dr. Meera Keskar Dr. Rohan Phatak Prof. Shanmugaperumal Kannan 《欧洲无机化学杂志》2023,26(17):e202300140
Thermo physical properties of potassium, rubidium and cesium thorium phosphate compounds were investigated. All compounds were synthesized by conventional solid state method. Formation of orthorhombic AMThP3O10, tetragonal AM2Th(PO4)2 and monoclinic AMTh2(PO4)3; [AM=K, Rb and Cs] was confirmed using Powder X-ray diffraction (XRD) technique. Structural study of CsThP3O10 was carried out for the first time from Rietveld refinement of XRD data. Thermal stability of all compounds was established using Thermogravimetric analysis (TGA) technique. When heated at 1673 K for 30 h in air, all the compounds decompose to ThO2. High temperature X-ray diffraction (HT-XRD) data of the compounds, synthesized during present study, were collected in an inert atmosphere from ambient to 973 K and their thermal expansion coefficients were calculated. These compounds show positive thermal expansion up to 973 K. Molar heat capacities for all phosphates were measured between 300–863 K using Differential Scanning Calorimeter. Alkali metal thorium phosphates, AMThP3O10 and AMTh2(PO4)3, showed efficient uptake of uranyl ion from aqueous acidic medium predominantly following Langmuir isotherm and Webber Morris intra particle diffusion kinetics. 相似文献
76.
77.
K. N. Mehrotra Meera Sharma A. S. Gahlaut 《Journal of polymer science. Part A, Polymer chemistry》1989,27(5):1631-1639
The CMC and various acoustic parameters of praseodymium soaps in 1-pentanol have been determined by ultrasonic velocity measurements. The results show that the ultrasonic velocity, specific acoustic impedance, apparent molal compressibility, and molar sound velocity increase while adiabatic compressibility and intermolecular free length decrease with increasing concentration and chain length of soap. 相似文献
78.
Ramu Ram Rubel Chakravarty Yugandhara Pamale Asuhtosh Dash Meera Venkatesh 《Chromatographia》2009,69(5-6):497-501
An industrial chromatographic 99Mo–99mTc generator has been developed with the aid of chromatographic alumina to obtain 99mTc in a non-aqueous medium. This generator system takes advantage of tributyl phosphate to extract 99mTc selectively with appreciable yield and in high radiochemical and radionuclidic purity. This facile, versatile and efficient approach provides 99mTc at industrial sites in a medium soluble in hydrocarbon solvents, for radiotracer applications. 相似文献
79.
J. R. Merchant F.A.Sc. Meera S. Kamath Suneel Y. Dike 《Proceedings Mathematical Sciences》1977,85(3):115-124
Cyanoethylation of some dimethyl- and trimethylphenols in acidic and basic media has been investigated. The cyanoethyl derivatives obtained were hydrolysed to the corresponding acids which on cyclisation with PPA afforded either dihydrocoumarin or chromanone whose structures were assigned on the basis of chemical and spectral evidence. 相似文献
80.
H.R. Chandrasekhar Meera Chandrasekhar Murli H. Manghnani 《Solid State Communications》1979,31(5):329-333
In this paper we report the infrared and Raman studies of titanium doped silicate glasses for a number of Ti concentrations. New modes associated with the titanium groups are identified. The observed shifts and broadenings in the spectra of vitreous silica are discussed in the context of random network models. The “anomalous” decrease in density with the addition of titanium is attributed to an increase in the average intertetrahedral angle of the SiO4 network. 相似文献