首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   53篇
  免费   0篇
化学   33篇
力学   1篇
数学   10篇
物理学   9篇
  2022年   1篇
  2021年   1篇
  2019年   1篇
  2017年   1篇
  2014年   1篇
  2013年   4篇
  2012年   4篇
  2011年   5篇
  2010年   2篇
  2009年   2篇
  2008年   3篇
  2007年   1篇
  2006年   5篇
  2005年   6篇
  2003年   3篇
  2002年   2篇
  2000年   2篇
  1997年   1篇
  1995年   1篇
  1994年   1篇
  1993年   1篇
  1992年   2篇
  1987年   1篇
  1984年   1篇
  1976年   1篇
排序方式: 共有53条查询结果,搜索用时 15 毫秒
1.
Desorption of chloroorganic compounds from a bed of activated carbon   总被引:1,自引:0,他引:1  
The desorption of 1,2-dichloroethane from a bed of DTO activated carbon after adsorption from aqueous solution has been investigated. The desorption process was carried out using steam. The basic characteristics of the process were determined. The studies were performed in the temperature range 100-160 degrees C. A steam consumption indicator reduces with an increase of temperature from 100 to 140 degrees C. An elevation of temperature above 140 degrees C does not cause an improvement in the desorption efficiency. The number of performed cycles does not reduce the adsorption capacity of used activated carbon. Studies on the regeneration of the bed saturated with a seven-component mixture of chloroorganic compounds at temperature of 140 degrees C were carried out. The degree of removal of the sum of chloro-derivatives exceeded 0.96 at a volume ratio of steam (recalculated on the condensate) to bed of about 10. It was found that the dechlorination proceeds during desorption at elevated temperature. The quantitative ratio of chloro-derivatives in the desorbate was changed in comparison to the composition of wastewater directed to the adsorption.  相似文献   
2.
Deprotonation of 5,10,15,20-tetrakis(pentafluorophenyl)-21-H, 23-H-porphyrin (PhF5PorH2) by various bases has been studied by 1H NMR and kinetic methods. The kinetic parameters in acetonitrile were defined for proton transfer reactions yielding [NH]+ protonated bases and [NHN] anions with intramolecular hydrogen-bonded chains.  相似文献   
3.
Summary A new method of the determination of thallic ions [Tl(III)] in the presence of thallous [Tl(I)] ones, based on the oxidizing properties of Tl(III) towards cysteine was proposed. Cysteine was employed as an initiator in the iodineazide reaction and the oxidized part of the initiator was eliminated from the induced reaction medium by the respective redox reaction; the reaction products do not affect the above reaction. The contents of thallic ions (50–500 ng) in the sample can be determined from the progress in the induced reaction by measuring the unreacted iodine. The relative experimental error of the determination does not exceed 6%.  相似文献   
4.
The influence of pre-reactor and reactor temperatures on the conversion of 1,3-dichloropropan-2-ol and the selectivity of its transformation to epichlorohydrin in continuous dehydrochlorination for two modes of the reaction product collection was studied. The dehydrochlorination process and mechanism of diglycidyl ether formation are described.  相似文献   
5.
The influence of technological parameters on the dehydroiodination of perfluoroalkylethene iodides (CF3)2CF(CF2CF2)nCH2CH2I, where n = 1, 2, 3 and 4, has been investigated. The most advantageous conditions for the two-stage oxidation of (CF3)2CF(CF2CF2)nCHCH2, with ozone in the first stage, followed by the oxidation with hydrogen peroxide to the perfluorocarboxylic acids, were determined. The effects of temperature and time on the conversion of perfluoroalkylethenes during the oxidation with ozone were studied. In the second stage, the selectivity of transformation (of each homologue) to the perfluorocarboxylic acid in relation to the theoretical amount resulting from a quantity of perfluoroalkylethene used and the conversion of perfluoroalkylethene in the temperature range of 10-80 °C has been determined.  相似文献   
6.
The ternary uranium(III) halides A2UX5 (A = K, Rb; X = Cl, Br, I) have been prepared from the binary components AX and UX3 in sealed tantalum containers. According to their Guinier X-ray powder patterns, they all crystallize with the K2PrCl5/Y2HfS5 type of structure. Lattice constants for ambient temperature are reported. Single-crystal structure refinemens were undertaken for K2UI5 and Rb2UCl5. Magnetic susceptibility data were recorded with a SQUID magnetometer from liquid helium to room temperature. One-dimensional (intrachain) and three-dimensional antiferromagnetic ordering occur at low temperatures dependent upon the U3+? U3+ distance. Absorption spectra were recorded between 4 000 and 28 000 cm?1. They show f—f transitions typical for U3+ and, depending on the halide, very strong f—d transitions above 14 000 to 15 000 cm?1, respectively.  相似文献   
7.
The mixed crystals of 1,2-bis(diethylaminomethyl)-3,6-di- and 3,4,6-trichloro-benzene perchlorate at 0.5:0.5 ratio have been studied using X-ray diffraction and FT-IR spectroscopy. The molecules of di- and tri-chloro derivatives are distributed randomly in the crystal lattice; however, this disorder manifested mainly by a partial occupation of the chlorine atom at C(4) and by relatively big atomic temperature parameters even at 99 K, particularly for the oxygens of the perchlorate anion. The proton in the [NHN]+ bond refined close to the equidistant position between the nitrogens. The conformations of the diethylaminomethyl substituents are pseudo-symmetrical relative to the plane and twofold axis passing through the midpoint of the hydrogen bond. The IR spectrum of the crystals shows a broad intense band and an intense continuous absorption indicating relatively high proton polarizability in the intramolecular hydrogen bond. In acetonitrile and in chloroform, the proton in the intramolecular hydrogen bond also shows a very high proton polarizability demonstrated by the continuous absorption in the IR spectrum.  相似文献   
8.
Expanding the wave functions of the ground and excited states of HD(+) (or pde) in terms of spherically symmetric explicitly correlated Gaussian functions with preexponential multipliers consisting of powers of the internuclear distance, and using the variational method, we performed very accurate nonadiabatic calculations of all bound states of this system corresponding to the zero total angular momentum quantum number (vibrational states; v=0-22). The total and the transition energies obtained agree with the best available calculations. For each state we computed the expectation values of the d-p, d-e, and p-e interparticle distances. This is the first time these quantities were computed for HD(+) using rigorous nonadiabatic wave functions. While up to the v=20 state some asymmetry is showing in the d-e and p-e distances, for v=21 and v=22 we observe a complete breakdown of the Born-Oppenheimer approximation and localization of the electron almost entirely at the deuteron.  相似文献   
9.
The paper presents a non-element method of solving boundary problems defined on polygonal domains modeled by corner points. To solve these problems a parametric integral equation system (PIES) is used. The system is characterized by a separation of the approximation of boundary geometry from the approximation of boundary functions. This feature makes it possible to effectively investigate the convergence of the obtained solutions with no need of performing the approximation of boundary geometry. The testing examples included confirm high accuracy of the solutions.  相似文献   
10.
Numerical Algorithms - The paper introduces the analytical modification of the classic boundary integral equation (BIE) for Stokes equation in 3D. The performed modification allows us to obtain...  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号