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We prove that externally definable sets in first order NIP theories have honest definitions, giving a new proof of Shelah’s expansion theorem. Also we discuss a weak notion of stable embeddedness true in this context. Those results are then used to prove a general theorem on dependent pairs, which in particular answers a question of Baldwin and Benedikt on naming an indiscernible sequence. 相似文献
4.
Dr. Yumei Lin Dewang Xie Prof. Dr. Werner Massa Dr. Leonhard Mayrhofer Sina Lippert Benjamin Ewers Dr. Alexey Chernikov Prof. Dr. Martin Koch Prof. Dr. Stefanie Dehnen 《Chemistry (Weinheim an der Bergstrasse, Germany)》2013,19(27):8806-8813
In situ transformations of selenidostannate frameworks in ionic liquids (ILs) were initiated by treatment of the starting phase K2[Sn2Se5] and the consecutive reaction products by means of temperature increase and/or amine addition. Along the reaction pathway, the framework dimensionalities of the five involved selenidostannate anions develop from 3D to 1D and back, both in top‐down and bottom‐up style. Addition of ethane‐1,2‐diamine (en) led to the reversion of the 2D→1D step from 2D‐{[Sn24Se56]16?} to 1D‐{[Sn6Se14]4?}. As rationalized by DFT investigations, the 2D anion is thermodynamically favored. Photoconductivity measurements reveal that all samples show Schottky contact behavior with absolute thresholds below 10 V. One of the samples exhibits conductive states within the energy range of visible photons. 相似文献
5.
Abstract On the basis of experimental results obtained in the present and some other works a model of melting of rare gas solids within bubbles formed in a crystalline metal matrix as a result of ion implantation is proposed. Rare gas solid is supposed to melt on heating at the expense of the bubble volume expansion by emission of a dislocation loop. On this basis the melting temperature can be estimated as one which is enough to provide for a pressure inside a bubble sufficient for the initiation of the dislocation loop punching. Values of melting temperatures obtained in this way are in good agreement with available experimental data. 相似文献
6.
L. A. Kochergina V. V. Chernikov O. V. Platonycheva 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2011,85(6):938-943
The heat effects of the reaction of a solution of D,L-tryptophan with solutions of KOH and HNO3 were measured by calorimetry at temperatures of 288.15, 298.15, and 308.15 K and ionic strength values of 0.25, 0.5, and
0.75 (KNO3). The effect of the temperature and concentration of the background electrolyte on the heats of dissociation of amino acid
was considered. The standard heat effects of ionization of D,L-tryptophan were determined by extrapolation to zero ionic strength.
The standard thermodynamical characteristics of the stepwise dissociation of D,L-tryptophan were calculated. 相似文献
7.
A. F. Aleksandrov D. N. Vaulin A. A. Kvas V. A. Chernikov 《Moscow University Physics Bulletin》2011,66(1):83-87
The results of experimental and theoretical studies on the propagation rate of pulsed discharge in air at atmospheric pressure
above liquids with different conductivities are presented. 相似文献
8.
N. A. Antropov E. Yu. Boyarko E. K. Gorbunov K. V. Grigorjev Yu. Yu. Kryuchkov O. G. Chernikov I. P. Chernov 《Bulletin of the Russian Academy of Sciences: Physics》2009,73(11):1496-1498
The problem of homogeneous irradiation of Si ingots of large diameter (i.e., comparable with the thermal neutron diffusion
length in silicon—20 cm) by thermal neutrons is considered. The effect of neutron absorption on the irradiation homogeneity
is discussed. It is established for some usual cases of neutron doping that the neutron distribution in the irradiation zone
affects the irradiation homogeneity. The results obtained can be useful for choosing and designing the irradiation zone for
neutron doping of silicon. 相似文献
9.
Thermodynamic characteristics of stepwise dissociation of glycyl-glycyl-glycine in aqueous solutions
A. I. Lytkin V. V. Chernikov O. N. Krutova G. G. Gorboletova I. A. Skvortsov A. S. Korchagina 《Russian Journal of Inorganic Chemistry》2017,62(2):240-243
The heats of interaction between glycyl-glycyl-glycine and solutions of nitric acid and potassium hydroxide are determined by calorimetry at 298.15 K and ionic strengths of 0.25, 0.50, and 0.75 in the presence of KNO3. The standard thermodynamic characteristics (Δr H°, Δr G°, and Δr S°) of acid–base interaction in aqueous solutions of the peptide are calculated. The effect of background electrolyte concentration on the enthalpy of dissociation of glycyl-glycyl-glycine is discussed. 相似文献
10.
A. I. Lytkin V. V. Chernikov O. N. Krutova I. A. Skvortsov 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2017,91(6):1021-1025
Enthalpies of complex formation for glycine (HL±) with Ce3+ and Er3+ ions at 298.15 K and the value of the ionic strength of 0.5 (KNO3) are determined by calorimetric means using two independent procedures. Thermodynamic characteristics of the reactions of formation for complexes of glycine with Ce3+ and Er3+ ions at various [metal]: [ligand] molar ratios are calculated. 相似文献