全文获取类型
收费全文 | 7688篇 |
免费 | 481篇 |
国内免费 | 912篇 |
专业分类
化学 | 2995篇 |
晶体学 | 13篇 |
力学 | 121篇 |
综合类 | 71篇 |
数学 | 607篇 |
物理学 | 2950篇 |
无线电 | 2324篇 |
出版年
2024年 | 25篇 |
2023年 | 104篇 |
2022年 | 176篇 |
2021年 | 163篇 |
2020年 | 201篇 |
2019年 | 182篇 |
2018年 | 219篇 |
2017年 | 271篇 |
2016年 | 359篇 |
2015年 | 362篇 |
2014年 | 419篇 |
2013年 | 507篇 |
2012年 | 541篇 |
2011年 | 645篇 |
2010年 | 427篇 |
2009年 | 491篇 |
2008年 | 496篇 |
2007年 | 529篇 |
2006年 | 439篇 |
2005年 | 336篇 |
2004年 | 333篇 |
2003年 | 295篇 |
2002年 | 304篇 |
2001年 | 179篇 |
2000年 | 171篇 |
1999年 | 132篇 |
1998年 | 121篇 |
1997年 | 84篇 |
1996年 | 82篇 |
1995年 | 74篇 |
1994年 | 54篇 |
1993年 | 55篇 |
1992年 | 56篇 |
1991年 | 62篇 |
1990年 | 27篇 |
1989年 | 25篇 |
1988年 | 23篇 |
1987年 | 16篇 |
1986年 | 16篇 |
1985年 | 13篇 |
1984年 | 10篇 |
1983年 | 8篇 |
1982年 | 12篇 |
1981年 | 7篇 |
1980年 | 3篇 |
1979年 | 8篇 |
1978年 | 5篇 |
1974年 | 3篇 |
1973年 | 6篇 |
1959年 | 1篇 |
排序方式: 共有9081条查询结果,搜索用时 0 毫秒
101.
Hanifa Daoui Yasmine Bouhamidi Ahmed Boucherit Mohamed Zouikri 《International Journal of Polymer Analysis and Characterization》2018,23(5):463-473
The fundamental understanding of the behavior of a solid is intimately related to the understanding of the interactions on the surface of the latter, a major challenge in particular if the material is natural and ecological. The infinite dilution-inverse gas chromatography was used to evaluate the surface thermodynamic properties of several phases (grafted and/or coated) diatomite. A series of non- or polar-solute probes were injected at temperatures of 45?°C and 90?°C. The dispersive surface free energies values of the supports decrease with increasing temperature and their active surface is amphoteric with predominantly acidic character. 相似文献
102.
用第一性原理的FP-LMTO能带计算方法研究了重费米子化合物LiV2O4的电子结构.结果表明:费米面附近的导带是由V原子的3d电子形成的宽度为2.5eV的窄能带,是3d态在立方晶体场中具有t2g对称性的子带;它与O的2p轨道构成的能带有近1.9eV的能隙.计算得出的费米能处电子态密度和线性电子比热系数分别是11.1 states/eV f.u.和26.7 mJ/molK2.费米面处的能带色散具有电子型和空穴型两种,呈现出一种复杂的费米面结构.LSDA以及LDA+GGA计算表明, LiV2O4有一个磁矩为每个钒原子1.13μB,总能比LDA基态低约148 meV/f.u.的铁磁性基态.由目前的能带结构计算的结果无法确定这一类Kondo体系的局域磁矩的来源,表明这一化合物中的重费米子行为可能有别于在含有4f和5f稀土的重费米子合金中观察到的局域磁矩与传导电子的交换作用机制,其中存在量子相变的可能. 相似文献
103.
近来,有关 C60的研究主要集中在有关晶格动力学 [1]、电子结构 [2~ 4]和 MxC60( M代表碱金属或碱土金属)的超导电性研究 [5].但由于 MxC60在大气中不能稳定存在,制约了 MxC60的深入研究和实际应用 .最近, Masterov等人报导了他们对 Cu/C60的超导特性研究 [6~ 7],认为其转变温度 Tc在 80~ 120 K之间,这个转变温度比现有的 MxC60的转变温度( Tc~ 40 K)要高得多 .但有关更进一步的研究未见报导 .因此,我们拟对 CuxC60体系作较为详尽的研究,这对于进一步研究其超导机理是有必要的 .本工作是在成功地制备了 CuxC60薄膜的… 相似文献
104.
The Ladder Structure of LiNb6Cl19 LiNb6Cl19 was obtained from a solid state reaction of Nb powder, NbCl5, and Li2C2 at 530 °C. The structure was refined by single‐crystal X‐ray diffraction (space group Pmma (No. 51), Z = 2, a = 2814.6(1) pm, b = 687.35(5) pm, c = 641.39(3) pm). It contains edge and face bridging [NbCl6] octahedra forming the motif of a ladder. The parallel alignment of ladders yields a one‐dimensional structure, with lithium ions occupying voids. Each ladder combines characteristic fragments from the niobium chloride structures NbCl4, A3Nb2Cl9 (A = Rb, Cs), and Nb3Cl8. The arrangement of niobium atoms in LiNb6Cl19 appears to be similar with trigonal niobium clusters obtained in the structure of Nb3Cl8. The electronic structures of niobium clusters in Nb3Cl8 and LiNb6Cl19 are compared with each other. 相似文献
105.
Shigeru Sasaki 《Journal of organometallic chemistry》2011,696(21):3307-3315
The sterically crowded triarylphosphines bearing formyl and benzoyl groups were synthesized and characterized by X-ray crystallography. The benzoyl derivative was converted to the p-quinomethane conjugated with the triarylphosphine. The McMurry coupling of the formyl derivative afforded the diarylethene bearing the two sterically-crowded-triarylphosphine moieties. The cyclic voltammograms of these compounds show reversible redox waves corresponding to the oxidation to the radical cations of the triarylphosphines and irreversible or quasi-reversible waves corresponding to the reduction of the acceptor moieties. The electronic and the fluorescence spectra of these π-conjugated systems, especially push-pull substituted derivatives, exhibit bathochromic shift typical of the extended π-conjugated systems especially in the polar solvent, and the large Stokes shift typical of the crowded triarylphosphines is enhanced by conjugation with the acceptor moiety. 相似文献
106.
107.
Suarez E Nguyen HP Ortiz IP Lee KJ Kim SB Krzywinski J Schug KA 《Analytica chimica acta》2011,706(1):157-163
Malaria is a devastating mosquito-borne disease, which affects hundreds of millions of people each year. It is transmitted predominantly by Anopheles gambiae, whose females must be >10 days old to become infective. In this study, cuticular lipids from a laboratory strain of this mosquito species were analyzed using a mass spectrometry method to evaluate their utility for age, sex and mating status differentiation. Matrix-assisted laser desorption/ionization-mass spectrometry (MALDI-MS), in conjunction with an acenaphthene/silver nitrate matrix preparation, was shown to be 100% effective in classifying A. gambiae females into 1, 7–10, and 14 days of age. MALDI-MS analysis, supported by multivariate statistical methods, was also effective in detecting cuticular lipid differences between the sexes and between virgin and mated females. The technique requires further testing, but the obtained results suggest that MALDI-MS cuticular lipid spectra could be used for age grading of A. gambiae females with precision greater than with other available methods. 相似文献
108.
109.
110.
Gu Q David F Lynen F Rumpel K Dugardeyn J Van Der Straeten D Xu G Sandra P 《Journal of chromatography. A》2011,1218(21):3247-3254
In this paper, automated sample preparation, retention time locked gas chromatography-mass spectrometry (GC-MS) and data analysis methods for the metabolomics study were evaluated. A miniaturized and automated derivatisation method using sequential oximation and silylation was applied to a polar extract of 4 types (2 types×2 ages) of Arabidopsis thaliana, a popular model organism often used in plant sciences and genetics. Automation of the derivatisation process offers excellent repeatability, and the time between sample preparation and analysis was short and constant, reducing artifact formation. Retention time locked (RTL) gas chromatography-mass spectrometry was used, resulting in reproducible retention times and GC-MS profiles. Two approaches were used for data analysis. XCMS followed by principal component analysis (approach 1) and AMDIS deconvolution combined with a commercially available program (Mass Profiler Professional) followed by principal component analysis (approach 2) were compared. Several features that were up- or down-regulated in the different types were detected. 相似文献