排序方式: 共有45条查询结果,搜索用时 359 毫秒
1.
2.
N.E. Kolobova A.B. Antonova O.M. Khitrova M.Yu. Antipin Yu.T. Struchkov 《Journal of organometallic chemistry》1977,137(1):69-78
The novel complexes CpRe(CCHPh)(CO)2 and Cp2Re2(μ-CCHPh)(CO)4 containing a terminal and a bridging phenylvinylidene ligand respectively and the binuclear complex Cp(CO)2Re[CC(Ph)C(Ph)CH2]Re(CO)2Cp were obtained in the reaction of CpRe(CO)3 with PhCCH.According to an X-ray study of the latter complex the unusual bridging ligand is η1-bonded to one Re atom and η2-bonded to the other. 相似文献
3.
4.
Mass spectrometry of π-complexes of transition metals XI. Manganese and rhenium vinylidene complexes
V.F. Sizoi Yu.S. Nekrasov Yu.N. Sukharev N.E. Kolobova O.M. Khitrova N.S. Obezyuk A.B. Antonova 《Journal of organometallic chemistry》1978,162(2):171-178
The mass spectra of (π-C5H5)nMn(CO)(L)1(L′) (M = Mn, Re; L = CO, P(C6H5)3, P(OC6H5)3; L′ is a vinylidene ligand) are reported and characterised by strong dehydrogenation of the rhenium complexes. In bimetallic analogues, the ReRe bond is stronger than the MnMn. 相似文献
5.
Messin G Karr JP Baas A Khitrova G Houdré R Stanley RP Oesterle U Giacobino E 《Physical review letters》2001,87(12):127403
We present novel experimental results demonstrating the coherence properties of the nonlinear emission from semiconductor microcavities in the strong coupling regime, recently interpreted by parametric polariton four-wave mixing. We use a geometry corresponding to degenerate four-wave mixing. In addition to the predicted threshold dependence of the emission on the pump power and spectral blueshift, we observe a phase dependence of the amplification which is a signature of a coherent polariton wave mixing process. 相似文献
6.
A. Thränhardt C. Ell G. Khitrova H.M. Gibbs 《The European Physical Journal B - Condensed Matter and Complex Systems》2002,27(4):571-576
We calculate energy levels, dipole moments and radiative broadening of interface fluctuation quantum dots. For optically allowed
states, the dipole moment grows proportionally to the lateral quantum dot radius while the radiative broadening saturates
towards the quantum well radiative broadening for large lateral quantum dot radii. This is accompanied by a change in the
angular emission pattern, concentrating emission in forward and backward direction. Optically forbidden states do not couple
to light propagating in the growth direction yet they may have a considerable radiative broadening due to spontaneous emission
in other directions.
Received 20 March 2002 Published online 25 June 2002 相似文献
7.
The results of investigation of matched filtering on the basis of thick holograms for fingerprint identification and its comparison with the results of matched filtering on the basis of thin holograms are described. It was obtained experimentally that the use of thick holograms for fingerprint identification essentially improves the signal/noise ratio. 相似文献
8.
Moiseeva A. A. Stepanov S. V. Butin K. P. Zhidkova O. B. Khitrova O. M. Bregadze V. I. 《Russian Chemical Bulletin》2003,52(9):1982-1989
The cyclic voltammetry and rotating disc electrode methods were used to study the electrochemical reduction and oxidation of boron-mercurated mono- and dimercury derivatives of 3-cyclopentadienyl-3-cobalta-1,2-dicarba-closo-dodecaborane and boron-mercurated dicobaltacarborane on platinum and glassy carbon electrodes in MeCN and DMF solutions. The first reduction step was the reversible electron transfer to the cobalt atom. This process is complicated by adsorption of the reaction product on the electrode, which is especially pronounced when the electrode is coated by metallic mercury evolved at later steps of reduction. The presumptive mechanisms of electroreduction are discussed in detail. 相似文献
9.
10.
A. Schwake K. Cammann A. L. Smirnova S. S. Levitchev V. L. Khitrova A. L. Grekovich Y. G. Vlasov 《Fresenius' Journal of Analytical Chemistry》1999,363(4):369-375
Potentiometric and electrochemical impedance spectroscopic investigations of calcium-selective membranes containing poly(vinylchloride),
dioctylphenylphosphonate, calcium (bis[4-(1,1,3,3-tetramethylbutyl)phenyl] phosphate) and different amounts of the lipophilic
anionic additive tridodecylmethylammonium chloride were carried out. The addition of the lipophilic additive changes the properties
of calcium-selective electrodes, e.g. slope and calcium selectivity. The selectivity for calcium in presence of H+, Na+, K+, NH4
+, Mg2+, Ba2+, Sr2+ and (C2H5)4N+ was measured by three different methods, namely separate solution method, fixed interference method and matched potential
method. Membranes with different concentration ratios between the calcium-exchanger and tridodecylmethylammonium chloride
were investigated within half a year. The tendency of changing from cationic into anionic response for membranes containing
nearly equivalent concentrations of cation- and anion-exchanger was shown. This inversion of the electrode response depends
not only upon the concentration ratio of both ion-exchangers but also upon the total concentration of calcium-exchanger. Electrochemical
impedance spectroscopy was used for monitoring the development of membrane resistances during a soaking period of one month.
Based on these results dielectric constants for the calcium-selective membranes depending on the membrane composition were
determined. Furthermore, the dependence of the membrane resistance on the membrane thickness and the concentration of tridodecylmethylammonium
chloride was evaluated.
Received: 21 July 1998 / Revised: 16 October 1998 / Accepted: 23 October 1998 相似文献