全文获取类型
收费全文 | 3014篇 |
免费 | 25篇 |
国内免费 | 248篇 |
专业分类
化学 | 2793篇 |
晶体学 | 21篇 |
力学 | 12篇 |
综合类 | 1篇 |
数学 | 25篇 |
物理学 | 435篇 |
出版年
2023年 | 3篇 |
2022年 | 5篇 |
2021年 | 3篇 |
2019年 | 2篇 |
2018年 | 5篇 |
2017年 | 10篇 |
2016年 | 9篇 |
2015年 | 4篇 |
2014年 | 13篇 |
2013年 | 10篇 |
2012年 | 261篇 |
2011年 | 328篇 |
2010年 | 47篇 |
2009年 | 133篇 |
2008年 | 429篇 |
2007年 | 307篇 |
2006年 | 356篇 |
2005年 | 349篇 |
2004年 | 247篇 |
2003年 | 186篇 |
2002年 | 144篇 |
2001年 | 88篇 |
2000年 | 108篇 |
1999年 | 40篇 |
1998年 | 14篇 |
1997年 | 10篇 |
1996年 | 43篇 |
1995年 | 21篇 |
1994年 | 20篇 |
1993年 | 47篇 |
1992年 | 25篇 |
1991年 | 4篇 |
1990年 | 1篇 |
1989年 | 4篇 |
1988年 | 3篇 |
1987年 | 1篇 |
1986年 | 5篇 |
1984年 | 1篇 |
1979年 | 1篇 |
排序方式: 共有3287条查询结果,搜索用时 15 毫秒
991.
Dey SK Mondal N El Fallah MS Vicente R Escuer A Solans X Font-Bardía M Matsushita T Gramlich V Mitra S 《Inorganic chemistry》2004,43(7):2427-2434
Tridentate/tetradentate Schiff base ligands L(1) and L(2), derived from the condensation of o-vanillin or pyridine-2-aldehyde with N,N-dimethylethylenediammine, react with nickel acetate or perchlorate salt and azide, cyanate, or thiocyanate to give rise to a series of dinuclear complexes of formulas [Ni(L(1))(micro(1,1)-N(3))Ni(L(1))(N(3))(OH(2))].H(2)O (1), [[Ni(L(1))(micro(1,1)-NCS)Ni(L(1))(NCS)(OH(2))][Ni(L(1))(micro-CH(3)COO)Ni(L(1))( NCS) (OH(2))]] (2) [[2A][2B]], [Ni(L(1))(micro(1,1)-NCO)Ni(L(1))(NCO)(OH(2))].H(2)O (3), and [Ni(L(2)-OMe)(micro(1,1)-N(3))(N(3))](2) (4), where L(1) = Me(2)N(CH(2))(2)NCHC(6)H(3)(O(-))(OCH(3)) and L(2) = Me(2)N(CH(2))(2)NCHC(6)H(3)N. We have characterized these complexes by analytical, spectroscopic, and variable-temperature magnetic susceptibility measurements. The coordination geometry around all of the Ni(II) centers is a distorted octahedron with bridging azide, thiocyanate/acetate, or cyanate in a micro(1,1) mode and micro(2)-phenolate oxygen ion for 1-3, respectively, or with a double-bridging azide for 4. The magnetic properties of the complexes were studied by magnetic susceptibility (chi(M)) versus temperature measurements. The chi(M) nus T plot reveals that compounds 1 and 4 are strongly ferromagnetically coupled, 3 shows a weak ferromagnetic behavior, and 2 is very weakly antiferromagnetically coupled. 相似文献
992.
993.
Crespo-Otero R Montero LA Rosquete G Padrón-García JA González-Jonte RH 《Journal of computational chemistry》2004,25(3):429-438
The present work explores the effect of substitution in all free positions of furfural on conformational preferences of formyl group by using ab-initio calculations at the MP2/6-31G(p,d) level of theory. Theoretical modeling was made in vacuo. The selected substituents were -CH(3), NH(2), NO(2) and F groups in 3, 4, 5 and ipso carbonyl positions. Geometries of all derivatives were analyzed and it is ascertained that substitution has not important consequences on furan ring geometry. Differences of energy between OO-cis and trans conformers and energy barriers between them are described and extreme cases are explained. Interesting features appear in the cases of -NH(2) and -NO(2) groups, and particularly when the 3 and ipso carbonyl positions are substituted. Variations in energy barriers are correlated with variations in C2-C6 distances for the transition states and planar forms. Substitution effect on Mülliken charges are analyzed and related with internal rotation energy barriers and differences between conformers. 相似文献
994.
Atienzar P Corma A García H Serra JM 《Chemistry (Weinheim an der Bergstrasse, Germany)》2004,10(23):6043-6047
An automatic system for high-throughput (HT) characterisation of large libraries of solid materials by photoluminescence spectroscopy is described. The system provides time-resolved transient emission spectra in the microsecond scale and can be employed for characterisation of materials of interest in the fields of catalysis and electroluminescence, amongst others. Here, we present its application to the optimisation of the ship-in-a-bottle synthesis of a novel electroluminescent polymer (PPV) and a photocatalyst (TP+), both encapsulated in large-pore zeolites. 相似文献
995.
Carriedo GA García Alonso FJ García Alvarez JL Lombardo GM Pappalardo GC Punzo F 《Chemistry (Weinheim an der Bergstrasse, Germany)》2004,10(15):3775-3782
The intrachain conformation, molecular structure and interchain assembly of isotactic (R)-poly(2,2'-dioxy-1,1'-binaphthyl)phosphazene (P-DBNP) both in the bulk state (I) and in the cast film (II) were studied by molecular dynamics (MD) simulations of models, as implemented by a bias potential for the analysis of the radial distribution function (RDF) obtained from large-angle X-ray scattering (LAXS) data. The microscopic structure and order extension of the polymer changed from I to II, as qualitatively shown in the shapes of their experimentally measured RDF curves. With the use of a bias potential, the MD simulations provided a much more accurate analysis of the models, as seen in the reproduction of the RDFs. The chiral P-DBNP chain was found to be consistent with helix conformations in both the I and the II samples. The predominant interchain clustering motif was best reproduced with a seven-chain model. In the case of I, the maximum chain length was 18 monomeric -R(2)NP- units, while in the case of the cast film II the chain was more elongated, up to distances of approximately 100 A, equivalent to over 48 monomeric -R(2)NP- units. The seven-chain assembly was accounted for in terms of nonbonded interactions favouring the minimum voids area between the seven tubular structures of the material. The results validate our earlier finding that MD analysis with implementation of a biasing potential for the RDFs can provide quantitative information on the structural and conformational features of amorphous solids. The combined theoretical and experimental approach was found to be a useful tool to detect, locate and evaluate the intra- and intermolecular modifications of materials subsequent to their phase transformation and, as in the present case, changes in their microscopic structures or preparation methods. 相似文献
996.
García-Acosta B Albiach-Martí X García E Gil L Martnez-Máñez R Rurack K Sancenón F Soto J 《Chemical communications (Cambridge, England)》2004,(7):774-775
A new family of differential chromogenic anion chemosensors is described based on anilinopyridine-metal cation coordinative signalling ensembles. 相似文献
997.
Electrocatalytic activity of ordered intermetallic phases for fuel cell applications 总被引:1,自引:0,他引:1
Casado-Rivera E Volpe DJ Alden L Lind C Downie C Vázquez-Alvarez T Angelo AC DiSalvo FJ Abruña HD 《Journal of the American Chemical Society》2004,126(12):4043-4049
The electrocatalytic activities of a wide range of ordered intermetallic phases toward a variety of potential fuels have been studied, and results have been compared to those of a pure polycrystalline platinum (Pt(pc)) electrode. A significant number of the ordered intermetallic phases exhibited enhanced electrocatalytic activity when compared to that of Pt, in terms of both oxidation onset potential and current density. The PtBi, PtIn, and PtPb ordered intermetallic phases appeared to be the most promising electrocatalysts tested thus far for fuel cell applications. PtPb, in particular, showed an onset potential that was 100 mV less positive and a peak current density approximately 40 times higher than those observed for Pt in the case of methanol oxidation. The ability to control the geometric and electronic structures of the electrocatalytic material by using ordered intermetallic phases has been shown to be a promising direction of inquiry in the search for superior electrocatalysts for fuel cell applications. 相似文献
998.
Antimicrobial screening and quantitative determination of benzoic acid derivative of Gomphrena celosioides by TLC-densitometry 总被引:1,自引:0,他引:1
de Moura RM Pereira PS Januário AH França Sde C Dias DA 《Chemical & pharmaceutical bulletin》2004,52(11):1342-1344
The antimicrobial activity of ethanolic extract and pure compounds of Gomphrena celosioides have been screened by Kirby-Bauer method. Quantitative determination of 4-hydroxy-3-methoxy-benzoic acid in stems, leaves, flowers and roots was established by TLC-densitometry. Results showed significant activity against Staphylococcus aureus and Salmonella typhi. There were no significant differences in the determined benzoic acid derivative. 相似文献
999.
Monitoring coal-tar pitch composition changes during air-blowing by gas chromatography 总被引:2,自引:0,他引:2
Domínguez A Blanco C Santamaría R Granda M Blanco CG Menéndez R 《Journal of chromatography. A》2004,1026(1-2):231-238
A series of air-blown coal-tar pitches was studied by GC and GC-MS in order to achieve a deeper understanding of the behaviour of the different pitch components during air-blowing. Compounds present in the parent pitch were identified and quantified and then compared to those present in the air-blown pitches. The compounds observed were identical before and after the treatments, but the concentration of each compound changed with the treatment to a different extent depending on its molecular structure and consequently its reactivity to oxygen. The most reactive compounds were those with a mehylene-bridge in a five member ring, followed by those with a methyl group in their structure. 相似文献
1000.
A force-free granular gas is considered with an impact-velocity-dependent coefficient of restitution as it follows from the model of viscoelastic particles. We analyze structure formation in this system by means of three independent methods: molecular dynamics, numerical solution of the hydrodynamic equations, and linear stability analysis of these equations. All these approaches indicate that structure formation occurs in force-free granular gases only as a transient process. 相似文献