全文获取类型
收费全文 | 74篇 |
免费 | 0篇 |
专业分类
化学 | 59篇 |
晶体学 | 2篇 |
数学 | 2篇 |
物理学 | 11篇 |
出版年
2021年 | 1篇 |
2020年 | 1篇 |
2019年 | 3篇 |
2018年 | 2篇 |
2017年 | 3篇 |
2016年 | 3篇 |
2014年 | 5篇 |
2013年 | 3篇 |
2012年 | 2篇 |
2011年 | 4篇 |
2010年 | 3篇 |
2009年 | 1篇 |
2008年 | 2篇 |
2007年 | 2篇 |
2006年 | 6篇 |
2003年 | 1篇 |
2002年 | 1篇 |
2001年 | 1篇 |
1998年 | 1篇 |
1994年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1988年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1977年 | 2篇 |
1976年 | 2篇 |
1975年 | 2篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1972年 | 2篇 |
1970年 | 2篇 |
1969年 | 2篇 |
1968年 | 3篇 |
排序方式: 共有74条查询结果,搜索用时 296 毫秒
1.
2.
A model of concentration transition “ions and complexes in a water structure → ionic and ionicaqueous clusters → polymer structures
of salt and crystal hydrate melts” is suggested. The appearance of cluster nanostructures outside the first zone of a waterlike
structure is regarded as a general characteristic of solutions. The characteristics of solutions, phase equilibria, and salts
of complex composition are interpreted based on this model. Investigation of the complex dielectric constant of electrolytic
solutions in the SHF and EHF bands (7–119 GHz) at high concentrations showed that there are two dispersion regions in which
the relaxation times differ by a factor of 5–10. Relaxation processes are separated, the numbers of molecules in hydration
shells are calculated, and relaxation times are determined for bulky tetrahedral water with hydration shells of ions, for
clusters, and for ionicaqueous polymer chains. It is shown that the two structure subsystems of water molecules in concentrated
solutions may be described using the limited rotator/generalized diffusion molecular model.
Translated fromZhumal Strukturnoi Khimii, Vol. 39, No. 5, pp. 851–863, September–October, 1998. 相似文献
3.
Nested Runge-Kutta methods of fourth, fifth, and sixth orders of accuracy are constructed for numerical solution of the Cauchy problem for the ordinary differential equation y=f(x, y). The first two stages of the fifth- and sixth-order methods determine the fourth-order method, and the ftrst three stages of the sixth-order method determine the fifthorder method. Numerical values of the parameters for these methods are determined and two test problems are solved numerically.Translated from Vychislitel'naya i Prikladnaya Matematika, No. 57, pp. 42–48, 1985. 相似文献
4.
Larisa Timofeeva Andrey Lyashchenko Irina Balakaeva Alexandr Lileev Yulia Simonova 《International Journal of Polymer Analysis and Characterization》2020,25(6):409-420
Abstract The high-frequency dielectric relaxation of aqueous solutions of protonated diallylammonium polyelectrolyte, namely poly(diallylmethylammonium trifluoroacetate) has been studied at the maximum water dispersion frequencies, 7.5–25?GHz, and temperatures of 288, 298, and 308?K. Dielectric relaxation parameters have been calculated and compared with similar characteristics of aqueous solutions of monomer, diallylmethylammonium trifluoroacetate, and pyrrolidinium trifluoroacetate salt simulated structure of pyrrolidinium polymer link. It has been concluded that although the monomer features hydrophobic hydration, its polymer exhibits hydrophilic hydration properties. This change is related to conformation of hydrophilic-hydrophobic polycations in aqueous solutions and the change in the structure of polymer links. 相似文献
5.
Crystallography Reports - The effect of nonelectrolyte additives with hydrophilic and hydrophobic hydration on the growth of potassium dihydrogen phosphate (KH2PO) crystals in the kinetic mode at... 相似文献
6.
7.
The low-intensity radiation and radiobrightness contrasts of multicomponent aqueous solutions of alkali metal chlorides have been studied at a frequency of 61.2 GHz. An additive character of changes in radiobrightness contrasts relative to initial binary systems (component ratio, 1: 1) is shown. The concentration dependence for solutions of potassium and lithium chlorides shows that initial different-sign radiation effects are eliminated. The radiation of mixed solutions proves to be close to the radiation of pure water (up to 4 m solutions). 相似文献
8.
9.
G. S. Lyashchenko A. S. Medvedeva L. P. Safronova O. B. Bannikova M. G. Voronkov 《Russian Chemical Bulletin》1991,40(12):2520-2523
The addition of triethylsilane and triethylgermane to N-propargylsaccharin in the presence of the Speier catalyst gives the gem adduct with trans configuration. This pathway accounts for 75–80% of the reaction.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2889–2891, December, 1991. 相似文献
10.