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81.
Abstract α,ω-Tertiary diamines react under high pressure with α,ω-di-iodo compounds to give cyclic or bicyclic bis-quaternary salts in almost quantitative yields. The role of high-pressure-induced changes in conformation of linear intermediates and the viscosity factor are discussed. 相似文献
82.
Shi-Lun Guo Yu-Lan Wang R. Brandt P. Vater B. A. Kulakov M. I. Krivopustov V. S. Butsev V. Bradnova Benhao Sa Yuming Zheng 《Radiation measurements》1995,25(1-4):261-264
Fast neutrons produced in 44 and 22 GeV 12C+Cu interactions have been recorded and analysed with a CR-39 detector stack. The irradiation of the CR-39 stack to fast neutrons was carried out at the accelerator Synchrophasotron, Joint Institute for Nuclear Research, Dubna, Russia. Areal and volume densities of tracks induced by fast neutrons in the CR-39 at different positions and for different etching time have been measured. The neutron production ratio of 44 GeV to 22 GeV 12C+Cu interactions has been obtained, which is 2.17 ± 0.30 by areal track density, or 2. 12±0.33 by step etch technique, or 2.03±0.34 by volume track density measurement. These results confirm that the production rate at 44 GeV 12C+Cu interactions is more than theoretical estimation. 相似文献
83.
S. Gopal C. Viswanathan M. Thamilselvan K. Premnazeer Sa. K. Narayandass D. Mangalaraj 《Ionics》2004,10(3-4):300-303
Indium Selenide thin films were electrodeposited on Indium Tin Oxide (ITO) coated glass substrates from a mixture of Indium
trichloride (InCl3) and selenium dioxide (SeO2) in aqueous solution by the potentiostatic electrodeposition technique. The InSe films showed that Mott’s variable-range
hopping conductivity (VRH) is dominant under low field (∼2×105 Vcm−1) condition. At high field the Current-Voltage studies (in the temperature range 300 – 380 K) revealed that the conductivity
of Indium selenide thin films is of Poole-Frenkel type. The plot drawn between Ln (I/V) and tV showed a straight line and
also the experimental data and the theoretical data closely matches. Hence Poole-Frenkel mechanism is confirmed and discussed
in detail.
Paper presented at the 2nd International Conference on Ionic Devices, Anna University, Chennai, India, Nov. 28–30, 2003. 相似文献
84.
85.
J.M. Boente L. Castedo A. Rodriguez de Lera J.M. Saá R. Suau M.C. Vidal 《Tetrahedron letters》1984,25(17):1829-1830
Three new phenolic cularines have been isolated from Sarcocapnos and Corydalis species. Their structures have been elucidated on the basis of spectroscopic studies and chemical transformations. 相似文献
86.
We study immersed prescribed mean curvature compact hypersurfaces with boundary in Hn+1(-1). When the boundary is a convex planar smooth manifold with all principal curvatures greater than 1, we solve a nonparametric Dirichlet problem and use this, together with a general flux formula, to prove a parametric uniqueness result, in the class of all immersed compact hypersurfaces with the same boundary. We specialize this result to a constant mean curvature, obtaining a characterization of totally umbilic hypersurface caps. 相似文献
87.
A simple method for determining the surface slope of a specimen under test in the high-sensitivity grating interferometry setup is proposed. The information on the derivative of out-of-plane displacement is obtained by software subtraction of two primary interferograms: a conventional one and one with diffraction orders laterally displaced in the image plane. Very good coincidence between the theoretical and experimental results has been obtained. The method can be used for studying static and transient events depending on the fringe pattern analysis method used. 相似文献
88.
M.J. Campello L. Castedo D. Dominguez A.Rodriguez de Lera J.M. Saá R. Suau E. Tojo M.C. Vidal 《Tetrahedron letters》1984,25(51):5933-5936
Structures 1a, 3 and 6 were deduced for the new oxoisocularine alkaloids, oxosarcophylline, yagonine and aristoyagonine, respectively, on the basis of spectroscopic studies and synthesis. 相似文献
89.
90.
Salvatori Mdel R Abou-Jneid R Ghoulami S Martin MT Zaparucha A Al-Mourabit A 《The Journal of organic chemistry》2005,70(20):8208-8211
[Chemical reaction: see text] Various substituted 2-aminotetrahydroazolopyridines and 2-aminohexahydroazolopyridines have been prepared by bromine-mediated addition of protected guanidine or urea to hydropyridine derivatives. The pH-dependent regioselective cleavage of the resulting aminal function led to the 2-aminoazole products III. The yields of the bicycles of type II, and their conversion into azoles III depends on the electronic properties of the substituents on the nitrogen of the tetrahydopyridine. 相似文献