全文获取类型
收费全文 | 204篇 |
免费 | 3篇 |
国内免费 | 2篇 |
专业分类
化学 | 170篇 |
晶体学 | 1篇 |
数学 | 14篇 |
物理学 | 24篇 |
出版年
2020年 | 15篇 |
2018年 | 8篇 |
2017年 | 3篇 |
2016年 | 13篇 |
2015年 | 12篇 |
2014年 | 9篇 |
2013年 | 11篇 |
2012年 | 6篇 |
2011年 | 10篇 |
2010年 | 11篇 |
2009年 | 5篇 |
2008年 | 4篇 |
2007年 | 7篇 |
2006年 | 12篇 |
2005年 | 3篇 |
2004年 | 6篇 |
2003年 | 6篇 |
2002年 | 3篇 |
2001年 | 3篇 |
1996年 | 2篇 |
1993年 | 2篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1986年 | 2篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1976年 | 2篇 |
1975年 | 1篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1968年 | 2篇 |
1967年 | 3篇 |
1966年 | 2篇 |
1965年 | 2篇 |
1962年 | 2篇 |
1961年 | 1篇 |
1960年 | 1篇 |
1959年 | 2篇 |
1943年 | 1篇 |
1941年 | 1篇 |
1934年 | 1篇 |
1909年 | 2篇 |
1907年 | 2篇 |
1905年 | 1篇 |
1903年 | 1篇 |
1900年 | 2篇 |
1895年 | 1篇 |
1892年 | 1篇 |
1891年 | 2篇 |
排序方式: 共有209条查询结果,搜索用时 15 毫秒
91.
Dupré P Gherman T Zobov NF Tolchenov RN Tennyson J 《The Journal of chemical physics》2005,123(15):154307
State-of-the-art experiments and calculations are used to record and assign the data obtained in the weakly absorbing blue energy region of the H2O spectrum. Continuous-wave cavity ringdown absorption spectroscopy with Doppler resolution is used to probe the range from 25,195 to 25,470 cm(-1) with an absorption sensitivity of approximately 1 parts per 10(9) (ppb)/cm. 62 lines of the polyad nu(OH)=8 are reported, of which 43 are assigned using variational nuclear calculations. The study includes absorption line intensities (in the range of 10(-28)-10(-26) cmmolecule) for all lines and self-broadening pressure coefficient for a few lines. The newly obtained energy levels are also reported. 相似文献
92.
The synthesis of a mononuclear Rh(III) complex, as a representative example of a series of related species, containing two cyclometallating ligands ppy (2-phenylpyridine) and one diimine bpy (2,2′-bipyridine) from a binuclear Cl-bridged compound is described. The absorption spectrum shows a maximum at 364 nm (ε = 7000), with a very weak shoulder (ε = 10) at 454 nm. This band is tentatively assigned to a metal-to-ligand charge-transfer transition. A reversible, one-electron reduction appears in the cyclic voltammogram at E1/2 = ?1.41 V (vs. NHE) and a irreversible oxydation at Ep = + 1.1 V. A detailed NMR analysis including 13C-NMR, NOE, SFORD as well as deuteration of the bpy ligand indicates the formation of only one isomer, having a C2 axis, bisecting the bpy ligand, with the two carbon ligands in cis-position. 103Rh, 13C and 103Rh,H couplings are observed. 相似文献
93.
94.
Adriana Ledeti Gabriela Vlase Titus Vlase Denisa Circioban Cristina Dehelean Ionut Ledeti Lenuta-Maria Suta 《Journal of Thermal Analysis and Calorimetry》2018,131(1):167-173
This paper presents the results obtained in a screening study for binary adduct formation of desipramine with three dicarboxylic acids—namely succinic, malonic and glutaric acids. Adduct formation is important because most tricyclic antidepressants show limited water solubility as free bases. Three binary adducts were prepared using a wet kneading method in non-homogenous media in presence of ethanol. Investigations of the solid state (ATR-FTIR, PXRD) and thermal analysis (TG/DTG/HF) were used for characterization of the prepared samples. The corroboration of data from employed instrumental techniques suggests that binary adducts in molar ratio 1:1 were obtained under the used experimental conditions. 相似文献
95.
Molecular interaction between hydrogen molecules and B2H4M (M=Li, Be, Sc, Ti, V) complexes has been studied using the DFT method (M06 functional) and 6-311++G** basis set. The hydrogen uptake capacity of the complexes considered is higher than the target set by the US Department of Energy (5.5 wt% by 2020). The metal atom bound strongly to the B2H4 substrate. Adsorption of molecular hydrogen on Be-, Ti-, and V-decorated complexes is thermodynamically possible for all the pressures and temperatures considered whereas it is unfavorable for Li-decorated complexes for all the pressure and temperatures. For the Sc-doped complexes, adsorption of molecular hydrogen is favorable below 330 K and entire pressure range considered. All the H2 adsorbed complexes are kinetically stable. For all the complexes, the interaction between the inorganometallic complexes and the H2 molecules adsorbed is attractive whereas that between adsorbed H2 molecules is repulsive. We have also performed molecular dynamics simulations to confirm the same number of H2 molecule adsorption from the simulations and DFT calculations. 相似文献
96.
97.
98.
A. W. B. R. Hefelmann C. Stolberg O. Forte V. Paguireff E. Kettler O. Brück Utz W. H. Hess M. Passon H. Pellet J. K. Haywood W. E. Stone F. C. Scheuch N. Knight M. Maynard S. G. Rawson C. Reichard Ch. A. Peters H. Walland E. Rupp A. Bergdolt Lunge M. Krüger T. Ulke B. Enright E. H. Schultze Vizern L. Legler A. d'Anselme und E. Maigret 《Fresenius' Journal of Analytical Chemistry》1907,46(2-3):172-184
Ohne Zusammenfassung 相似文献
99.
100.
Marc Pera‐Titus Dr. Rayan El‐Chahal Volainiana Rakotovao Dr. Cécile Daniel Sylvain Miachon Dr. Jean‐Alain Dalmon Dr. 《Chemphyschem》2009,10(12):2082-2089
The properties of condensed matter are strongly affected by confinement and size effects at the nanoscale. Herein, we measured by microvolumetry the increased solubility of H2 in a series of solvents (CHCl3, CCl4, n‐hexane, ethanol, and water) when confined in the cavities of mesoporous solids (γ‐alumina, silica, and MCM‐41). Gas/liquid solubilities are enhanced by up to 15 times over the corresponding bulk values for nanoliquid sizes smaller than 15 nm as long as gas/liquid interfaces are mesoconfined in a porous network. Although Henry’s law constant apparently no longer applies under these confinement, the concentration of dissolved H2 still increases linearly with increasing pressure in the range 1–5 bar. We discuss the role and main implications of surface excess concentrations at mesoconfined gas/liquid interfaces in enhancing gas solubility. 相似文献