全文获取类型
收费全文 | 328篇 |
免费 | 0篇 |
专业分类
化学 | 220篇 |
晶体学 | 4篇 |
力学 | 3篇 |
数学 | 11篇 |
物理学 | 90篇 |
出版年
2022年 | 2篇 |
2021年 | 3篇 |
2020年 | 3篇 |
2019年 | 5篇 |
2018年 | 9篇 |
2017年 | 10篇 |
2016年 | 22篇 |
2015年 | 4篇 |
2014年 | 11篇 |
2013年 | 17篇 |
2012年 | 11篇 |
2011年 | 16篇 |
2010年 | 8篇 |
2009年 | 13篇 |
2008年 | 20篇 |
2007年 | 14篇 |
2006年 | 17篇 |
2005年 | 9篇 |
2004年 | 14篇 |
2003年 | 8篇 |
2002年 | 5篇 |
2001年 | 9篇 |
2000年 | 4篇 |
1999年 | 5篇 |
1998年 | 2篇 |
1996年 | 2篇 |
1993年 | 4篇 |
1991年 | 3篇 |
1989年 | 4篇 |
1986年 | 4篇 |
1985年 | 5篇 |
1984年 | 2篇 |
1983年 | 3篇 |
1982年 | 4篇 |
1981年 | 5篇 |
1980年 | 7篇 |
1979年 | 4篇 |
1978年 | 3篇 |
1977年 | 5篇 |
1976年 | 3篇 |
1975年 | 5篇 |
1974年 | 3篇 |
1973年 | 4篇 |
1971年 | 1篇 |
1970年 | 3篇 |
1969年 | 4篇 |
1968年 | 3篇 |
1967年 | 1篇 |
1966年 | 1篇 |
1964年 | 1篇 |
排序方式: 共有328条查询结果,搜索用时 0 毫秒
61.
62.
The reaction of selenium with phenylacetylene in the presence of sodium ethoxide in boiling dioxane has given 2, 5-diphenyl-1, 4-diselenacyclohexa-2, 5-diene, whose molecules have the boat conformation. 相似文献
63.
64.
O.?V.?Fedorova E.?S.?FilatovaEmail author Yu.?A.?Titova M.?A.?Kravchenko I.?D.?Medvinskiy G.?L.?Rusinov V.?N.?Charushin 《Russian Chemical Bulletin》2018,67(4):743-746
Dihydropyrimidinethione podands, as well as podands containing 2-thienyl substituents have been synthesized via the multicomponent Biginelli reaction. Tuberculostatic activity of the novel podands was shown to depend on the polyether unit length. In particular, activity of dihydropyrimidinethione podands against laboratory strains of Mycobacterium tuberculosis, H37Rv, M. avium, M. terrae, and the clinical strain of multi-drug resistant M. tuberculosis (MDR), increases with a shortening of the polyether unit length. 相似文献
65.
K. V. Titova V. V. Buyanov V. P. Nikol’skaya O. B. Pudova O. A. Zharkova 《Russian Journal of Applied Chemistry》2009,82(6):995-999
Solubility and stability of (NH4)2SO4·H2O2 in organic solvents (glycerol, ethylene glycol, TOSOL-A40 OM antifreeze), in mixtures of an organic solvent and water, and in pure water was studied. Crystallographic properties of the ammonium sulfate precipitating from aqueous-organic solvents and aqueous solutions in various time intervals and differing from ordinary (NH4)2SO4 in solubility and one of crystallographic parameters were analyzed. 相似文献
66.
1. Dislocations in magnetic flux-grown garnet crystals (Y3Fe5O12 and others) have been observed. As a rule, {110} growth pyramids have more defects than {211} ones. 2. The highest content of defects (dislocation density 103–104 cm−2) is observed in Y3Fe5O12 that grows on crucible walls adjacent to the free surface of the solution where the flow of heat is not uniform to the greatest degree. Bottom grown crystals usually have less dislocations. Far fewer dislocations are in wall grown crystals, least of all dislocations are contained in crystals that grow inside the solution. The solution pouring off at the end of the crystallization period increases dislocation density by some dozens. 3. Heat treatment decreases dislocation density. The less dislocation content and the lower ordering are in the initial crystal, the higher heat treatment effectiveness. 相似文献
67.
Physics of Atomic Nuclei - A detailed analysis of T-odd asymmetries in the reactions of true ternary fission of nuclei that involves the emission of prescission alpha particles is performed within... 相似文献
68.
S. G. Kadmensky L. V. Titova O. S. Khmelevskaya 《Bulletin of the Russian Academy of Sciences: Physics》2009,73(6):831-834
The asymmetry coefficients of fragments’ angular distribution (FAD) for fission of 234, 236, 238U and 238, 240, 242Pu isotopes, induced by linearly polarized photons, have been calculated. The optimal energies for observing the polarization
parts in this asymmetry are found. Based on the experimental data on FAD for 232Th photofission induced by linearly polarized photons with the maximum energy E
γ = 10 MeV (with neglect of the contribution of absorption of electric quadruple photons), it is shown that the theoretical
and experimental FAD asymmetry coefficients coincide within standard deviations.
Original Russian Text ? S.G. Kadmensky, L.V. Titova, O.S. Khmelevskaya, 2009, published in Izvestiya Rossiiskoi Akademii Nauk.
Seriya Fizicheskaya, 2009, Vol. 73, No. 6, pp. 878–881. 相似文献
69.
A. V. Markin V. A. Ruchenin N. N. Smirnova E. A. Gorina S. N. Titova L. V. Kalakutskaya G. A. Domrachev 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2009,83(12):2032-2038
The temperature dependence of heat capacity C
p
o = f(T) of fullerene derivative (t-Bu)12C60 has been measured by a adiabatic vacuum calorimeter over the temperature range T = 6–350 K and by a differential scanning calorimeter over the temperature range T = 330–420 K for the first time. The low-temperature (T ≤ 50 K) dependence of the heat capacity was analyzed based on Debye’s the heat capacity theory of solids and its fractal
variant. As a consequence, the conclusion about structure heterodynamicity is given. The experimental results have been used
to calculate the standard thermodynamic functions C
p
o (T), H
o(T)−H
o(0), S
o(T) and G
o(T) − H
o(0) over the range from T → 0 to 420 K. The standard entropy of formation at 298.15 K of fullerene derivative under study was calculated. The temperature
of decomposition onset of derivative was determined by differential scanning calorimetery and thermogravimetric analysis.
The standard thermodynamic characteristics of (t-Bu)12C60 and C60 fullerite were compared. 相似文献
70.
A. Kononov S. V. Egorov N. Titova B. R. Semyagin V. V. Preobrazhenskii M. A. Putyato E. A. Emelyanov E. V. Deviatov 《JETP Letters》2017,105(8):508-513
We investigate charge transport through the junction between a niobium superconductor and the edge of a two-dimensional electron-hole bilayer, realized in an InAs/GaSb double quantum well. For the transparent interface with a superconductor, we demonstrate that the junction resistance is determined by the interlayer charge transfer near the interface. From an analysis of experimental I?V curves, we conclude that the proximity-induced superconductivity efficiently couples electron and hole layers at low currents. The critical current demonstrates periodic dependence on the in-plane magnetic field, while it is monotonic for the field that is normal to the bilayer plane. 相似文献