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排序方式: 共有182条查询结果,搜索用时 15 毫秒
1.
I. V. Bodnar 《Technical Physics》2003,48(5):587-591
The thermal expansion coefficients and the thermal conductivity of Bridgman-grown crystals of CuGa1−x
InxTe2 solid solutions are investigated. It is found that the thermal expansion coefficient varies with x linearly, while the thermal conductivity is minimal when x=0.5. The Debye temperature and the rms dynamic atomic displacements are calculated from experimental data. It is shown that
the Debye temperature decreases and the rms displacements in the crystal lattice sharply increase as the In content in the
solid solutions grows. 相似文献
2.
Charles S. Oakes John M. Simonson Robert J. Bodnar 《Journal of solution chemistry》1995,24(9):897-916
Relative densities of CaCl
2
(aq) with 0.22ml(mol-kg–1)6.150 were measured with vibrating- tube densimeters between 25 and 250°C and near 70 and 400 bars. Apparent molar volumes V calculated from the measured density differences were represented with the Pitzer ioninteraction treatment, with appropriate expressions chosen for the temperature and pressure dependence of the virial coefficients of the model. It was found that the partial molar volume at infinite dilution V
o
, and the second and third virial coefficients B
V
and C
V
, were necessary to represent V near the estimated experimental uncertainty. The ionic-strength dependent (1)v term in the B
V
coefficient was included in the fit. The representation for V has been integrated with respect to pressure to establish the pressure dependence of excess free energies over the temperature range studied. The volumetric data indicate that the logarithm of the mean ionic activity coefficient, ln ±(CaCl
2
), increases by a maximum of 0.3 at 400 bars, 250°C, and 6 mol-kg–1 as compared with its value at saturation pressure. 相似文献
3.
Shultz DA Vostrikova KE Bodnar SH Koo HJ Whangbo MH Kirk ML Depperman EC Kampf JW 《Journal of the American Chemical Society》2003,125(6):1607-1617
We report molecular structures and temperature-dependent magnetic susceptibility data for several new metal complexes of heterospin triplet ground-state biradical ligands. The ligands are comprised of both nitronyl-nitroxide (NN) and semiquinone (SQ) spin carriers. Five compounds are five-coordinate M(II) complexes (M = Mn, Co, Ni, Cu, and Zn), and one is a six-coordinate Ni(II) complex. Five compounds were structurally characterized. During copper complex formation a reaction with methanol occurs to form a unique methoxy-substituted SQ ring. Variable-temperature magnetic susceptibility studies are consistent with strong intraligand (NN-SQ and NN-PhSQ) ferromagnetic exchange coupling. For the five-coordinate Mn, Co, and Ni complexes, the S = 1 ligand is antiferromagnetically coupled to the metal. For both the five-coordinate Cu complex and the six-coordinate Ni complex, the ligand is ferromagnetically coupled to the metal spins in accordance with orbital symmetry arguments. Despite the low molecular symmetries, the predicted trend in metal-ligand exchange interactions is supported by spin dimer analysis based on extended Hückel calculations. For (NN-SQ)NiTp(Cum,Me)() (Tp(Cum,Me)() = hydro-tris(3-cumenyl-5-methylpyrazolyl)borate), an antisymmetric exchange term was required for the best fit of the magnetic susceptibility data. Antisymmetric exchange was less important for the other complexes due to inherently smaller Deltag. Finally, it is shown that intraligand exchange coupling is of paramount importance in stabilizing high-spin states of mixed metal-biradical complexes. 相似文献
4.
Esters of (arylhydrazono)chloroacetic acid reacted with tris(hydroxymethyl)aminomethane in the presence of trimethylamine under mild conditions to give 3-(arylhydrazonoyl)-5,5-di(hydroxymethyl)-2-oxomorpholines. 相似文献
5.
6.
7.
A systematic study of glycopeptide esterification for the semi‐quantitative determination of sialylation in antibodies 下载免费PDF全文
8.
9.
10.
N. S. Orlova I. V. Bodnar O. E. Kochkarik V. D. Janovich 《Crystal Research and Technology》1990,25(4):457-460
Investigations of the Debye characteristic temperature for the AgGa1−xInxSe2 solid solutions, calculation of some thermodynamic properties and analysis of its variation during substitution of Ga by In showed the increase of the molar volume, density, heat capacity, enthalpy, and decrease of the melting temperature, microhardness, thermal expansion coefficients, intrinsic energy with zero-point energy, this giving evidence for a decrease of the forces of the interatomic interaction. 相似文献