全文获取类型
收费全文 | 3166篇 |
免费 | 571篇 |
国内免费 | 361篇 |
专业分类
化学 | 2312篇 |
晶体学 | 37篇 |
力学 | 196篇 |
综合类 | 29篇 |
数学 | 311篇 |
物理学 | 1213篇 |
出版年
2024年 | 12篇 |
2023年 | 93篇 |
2022年 | 115篇 |
2021年 | 142篇 |
2020年 | 168篇 |
2019年 | 145篇 |
2018年 | 143篇 |
2017年 | 91篇 |
2016年 | 191篇 |
2015年 | 152篇 |
2014年 | 198篇 |
2013年 | 210篇 |
2012年 | 294篇 |
2011年 | 324篇 |
2010年 | 187篇 |
2009年 | 220篇 |
2008年 | 209篇 |
2007年 | 164篇 |
2006年 | 154篇 |
2005年 | 123篇 |
2004年 | 95篇 |
2003年 | 77篇 |
2002年 | 75篇 |
2001年 | 56篇 |
2000年 | 53篇 |
1999年 | 57篇 |
1998年 | 47篇 |
1997年 | 41篇 |
1996年 | 59篇 |
1995年 | 31篇 |
1994年 | 40篇 |
1993年 | 21篇 |
1992年 | 22篇 |
1991年 | 17篇 |
1990年 | 17篇 |
1989年 | 13篇 |
1988年 | 10篇 |
1987年 | 7篇 |
1986年 | 11篇 |
1985年 | 4篇 |
1984年 | 3篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1974年 | 1篇 |
1957年 | 3篇 |
排序方式: 共有4098条查询结果,搜索用时 15 毫秒
71.
Guangyu Shen Hua Wang Shuzhen Tan Jishan Li Guoli Shen Ruqin Yu 《Analytica chimica acta》2005,540(2):279-284
A novel piezoelectric immunosensor based on mixed self-assembled monolayers (mixed SAMs) formed by short-chain amine- and carboxyl-terminated thiols has been developed to immobilize antigens onto gold electrodes for detecting antisperm antibody (AsAb) in human serum samples. The properties and the enhanced performance of the affinity biosensor interface based on mixed SAMs are investigated. Most importantly, analytical results of several human serum samples using the developed technique are in satisfactory agreement with those given by the enzyme-linked immunosorbent assay (ELISA) method in the concentration ranging from 32.3 to 300.0 mU/ml. It means the procedure proposed in this paper is likely to have a great potential in research and may play an important clinical role in a few years later. 相似文献
72.
Scaling of electrokinetic transport in nanometer channels 总被引:1,自引:0,他引:1
Electrokinetic transport is a popular transport mechanism used in nanofluidic systems, and understanding its scaling behavior is important for the design and optimization of nanofluidic devices. In this article, we report on the scaling of electroosmotic flow and ionic conductivity in positively charged slit nanochannels by using continuum and atomistic simulations. The effects of confinement and surface charge are discussed in detail. In particular, we found that the viscosity of the interfacial water increases substantially as the surface charge density increases and the electrophoretic mobility of the interfacial ions decreases. We show that such effects can influence the scaling of the electrokinetic transport in confined nanochannels significantly. 相似文献
73.
The long-chain alkyl derivatives of a nucleoside analogue-acyclovir were prepared in the paper. One is stearyl-glycero-succinyl-acyclovir (SGSA) with a single 18-carbon length (C18) alkyl chain. Another is dioctadecyl-aspartate-succinyl-acyclovir (DASA) with double C18 alkyl chains. They were prepared by the esterification of succinyl-acyclovir with the lipids, and sodium salts of them were also prepared. Guanine moieties and alkyl moieties bring the derivatives intermolecular hydrogen bonding and hydrophobic interaction in water separately. The forces are influenced by the number of alkyl chains and the charged state, and determine the solubility and the self-assembly behavior of the derivatives. The double alkyl-chain derivatives (DASA and DASA-Na) formed rigid Langmuir monolayers on air/water surface, while the single alkyl chain derivatives (SGSA and SGSA-Na) did not. However, cholesterol (Chol) could assist SGSA to form rigid monolayers through inserting into the alkyl chains of SGSA to mimic the second alkyl chain. SGSA self-aggregates in water were prepared by the injection method with tetrahydrofuran as solvent. Cuboid-like shape and nanoscale size demonstrated that SGSA self-aggregates were self-assembled nanoparticles. Shape, particle size, zeta potential and phase transition of the nanoparticles were characterized. And they showed an average size of 83.2 nm, a negative surface charge of -31.3-mV zeta potential and a gel-liquid crystalline phase transition of 50.38 degrees C. The formation mechanism of self-assembled nanoparticles was analyzed. Hydrophobic interaction of alkyl chains improves SGSA molecules to form bilayers, and then cuboid-like nanoparticles were obtained by layer-by-layer aggregation based on inter-bilayers hydrogen bonding. However, the charged guanine moieties make SGSA-Na lose the function of hydrogen bonding so that SGSA-Na only forms vesicles in water based on hydrophobic interaction. Strong hydrophobicity and wide-open rigid double alkyl chains of DASA and DASA-Na restrict self-assembly in water media, and no homogeneous suspensions were obtained. Therefore, the molecular self-assembly behavior of the long-chain alkyl derivatives of nucleoside analogues on water surface or in water media is determined by the number of alkyl chains and the charged state. 相似文献
74.
The stereoselective synthesis of (2R,4R)-2-N-tert-butyloxycarbonyl amino-4,5-epoxido-valeric acid methyl ester 8,which is the key intermediate for the synthesis of (2′S,2R)-3-trans-nitrocyclopropyl-alanine,was first accomplished. 相似文献
75.
应用原子吸收分光光度法对济南市健康老年人血清中铜、锌、镁含量进行了测定。结果表明,健康老年人血液铜、锌水平低,但铜、锌比值正常,而镁的含量则较高。提示这组健康老年人未患心、脑血管疾病及糖尿病的原因可能与铜、锌、镁等微量元素有关。 相似文献
76.
77.
A new triterpenoid, fornicatin C (= (3β)‐3‐hydroxy‐18(13 → 12β)‐abeo‐lanosta‐13(17),24‐dien‐18‐oic acid; 1 ), was isolated from the fruiting bodies of Ganoderma fornicatum, together with the known compounds fornicatin A ( 2 ) and fornicatin B ( 3 ), among other constituents. The structure of 1 was elucidated by means of spectroscopic techniques, and those of 2 and 3 were identified by comparing their spectroscopic data with those reported in the literature. 相似文献
78.
79.
PrCl3-BaCl2-LiCl三元体系相图的研究 总被引:2,自引:0,他引:2
本文借助于DTA与X射线结构分析研究了PrCl_3-BaCl_2-LiCl三元体系相同。发现本体系内有对应于PrCl_2、α-BaCl_2、β-BaCl_2、LiCl和Ba_2PrCl_3的五个液相面、六条二次结晶线、一个三元低共熔点E(72.1wt%PrCl_3,2.8wt%BaCl_2,25.1wt%LiCl;441℃)和三元转熔点P(62.5wt%PrCl_3,12.5wt%BaCl_2,25.0wt%LiCi;490℃)。同时发现有一固相下形成的不稳定化合物Y(430℃分解)。 相似文献
80.
Han QB Lee SF Qiao CF He ZD Song JZ Sun HD Xu HX 《Chemical & pharmaceutical bulletin》2005,53(8):1034-1036
From the antibacterial fraction of the roots of Garcinia kola, 3',4',4',5,5',7,7'-heptahydroxy-3,8'-biflavanone (GB1) was isolated as the major constituent, whose interesting conformations were studied on the basis of its 1D and 2D NMR spectra obtained at different temperatures and in different solvents. GB1 showed antibacterial activities against methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant enterococci (VRE) with MIC of 32 and 128 microg/ml, respectively. 相似文献