全文获取类型
收费全文 | 4315篇 |
免费 | 632篇 |
国内免费 | 501篇 |
专业分类
化学 | 3144篇 |
晶体学 | 43篇 |
力学 | 250篇 |
综合类 | 35篇 |
数学 | 491篇 |
物理学 | 1485篇 |
出版年
2024年 | 16篇 |
2023年 | 110篇 |
2022年 | 139篇 |
2021年 | 164篇 |
2020年 | 207篇 |
2019年 | 182篇 |
2018年 | 153篇 |
2017年 | 120篇 |
2016年 | 195篇 |
2015年 | 200篇 |
2014年 | 183篇 |
2013年 | 294篇 |
2012年 | 298篇 |
2011年 | 314篇 |
2010年 | 226篇 |
2009年 | 219篇 |
2008年 | 250篇 |
2007年 | 202篇 |
2006年 | 200篇 |
2005年 | 207篇 |
2004年 | 187篇 |
2003年 | 123篇 |
2002年 | 121篇 |
2001年 | 112篇 |
2000年 | 120篇 |
1999年 | 103篇 |
1998年 | 99篇 |
1997年 | 87篇 |
1996年 | 96篇 |
1995年 | 71篇 |
1994年 | 76篇 |
1993年 | 58篇 |
1992年 | 46篇 |
1991年 | 39篇 |
1990年 | 42篇 |
1989年 | 28篇 |
1988年 | 25篇 |
1987年 | 25篇 |
1986年 | 20篇 |
1985年 | 23篇 |
1984年 | 15篇 |
1983年 | 5篇 |
1982年 | 8篇 |
1981年 | 10篇 |
1980年 | 8篇 |
1979年 | 5篇 |
1973年 | 3篇 |
1972年 | 2篇 |
1969年 | 2篇 |
1967年 | 2篇 |
排序方式: 共有5448条查询结果,搜索用时 22 毫秒
61.
测量高聚物粘度的方法很多。对高粘度样品经常采用拉伸蠕变方法,这时测定的是拉伸粘度习η_T: σ=η_T(?)_f其中σ是拉伸应力,(?)_f是由此引起的拉伸流动的应变速率。由于高聚物是粘弹性材料。因此必须设法区分弹性形变和流动形变,才能得到η_T值。Bueche和Kraus等曾分别用拉伸蠕变方法研究聚甲基丙烯酸甲酯和聚顺丁二烯的本体粘度。他们所用的处理方法有三 相似文献
62.
Zhaofeng Mao 《Journal of solid state chemistry》2007,180(2):453-460
The ability of malic acid to control calcium carbonate morphology has been investigated by aging calcium chloride solution in the presence of urea in a 90 °C bath. Malic acid favors the formation of calcite. A transition from single block to aggregate with special morphology occurs upon increasing malic acid concentration. The morphological development of CaCO3 crystal obviously depends on the starting pH. CaCO3 crystal grows from spindle seed to dumbbell in the pH regime from 7 to 11; while it evolves from spindle seed, through peanut, to sphere at pH=11.5. Both dumbbell and sphere consist of rods that are elongated along c-axis and capped with three smooth, well-defined rhombic {1 0 4} faces. A tentative growth mechanism is proposed based on the fractal model suggested by R. Kniep and S. Busch [Angew. Chem. Int. Ed. Engl. 35 (1996) 2624]. 相似文献
63.
Chen D Wang R Arachchige I Mao G Brock SL 《Journal of the American Chemical Society》2004,126(50):16290-16291
This communication describes a spin-coating method to nucleate organic molecular rods of uniform size from an inorganic nanoparticle at a solid surface. The particle-rod hybrid structure spontaneously forms when a film is spin coated from a mixed 2-propanol solution of arachidic acid (AA) and nanoparticles of cadmium selenide capped by mercaptoundecanoic acid (MUA-CdSe) on graphite. AFM images show that MUA-CdSe nanoparticles nucleate single crystalline rods of AA with a cross section of a single unit cell of the C-form. The solution-based process potentially allows the precise tuning of the wetting profile of the solution on the surface-attached nanoparticle, which provides the reservoir for the growth of the single crystalline rods. The results suggest that nanoparticles can be regarded as nanoseeds for the nucleation of guest crystals. It should be possible to further functionalize the AA rods by electrostatic complexation with metal or organic ions. 相似文献
64.
65.
66.
GuoHongLI YueMaoSHEN KeQinZHANG 《中国化学快报》2005,16(3):359-361
A novel saponin was isolated from the transformed products of ginsenoside Rh1 by Bacillus subtilis. It‘s structure was determined to be 3-O-β-D-glucopyranosyl-6-O-β-D-glucopyranosyl-20 (S)-protopanaxatriol on the basis of the spectral data. 相似文献
67.
[formula: see text] S-Nitrosoglutathione oxidized 4-substituted Hantzsch 1,4-dihydropyridines in CH3CN/H2O or CH3CN/phosphate aqueous buffer solution to give aromatic products in various yields. 相似文献
68.
The reaction of fluorine-containing halides and acetamides with conjugated dienoic acids initiated by sodium dithionite gave halide-free 1,4-adducts in 40-80% yields, with the E configuration as the major products. 相似文献
69.
70.
Nafion/methyl viologen (MV) has been chemically modified on a gold disk microelectrode (GDME). The electrochemistry of the Nafion/MV modified GDME is investigated by cyclic voltammetry (CV). Linear sweep voltammetry (LSV) and differential pulse amperometry (DPA) show that the Nafion/MV modified GDME exhibits very high electrocatalytic activity toward dioxygen reduction with good reproducibility and high sensitivity. The electrocatalytic peak current is found to be linear with the dioxygen concentration in the range of 3.44x10(-7) to 2.59x10(-4) mol l(-1) (at 25 degrees C), with a correlation coefficient of 0.9978. The detection limit (signal/noise=3) is calculated to be 0.19 mumol l(-1). The response time of the microsensor for dioxygen measurement is less than 15 s. For ten parallel measurements for 8.50 mumol l(-1) dioxygen, the relative standard deviation (RSD) is found to be 2.7%. The sensitivity of the microsensor is 0.17 nA mumol(-1) l(-1). This microsensor has been successfully employed to measure the concentration of dioxygen in real samples. The quantity of dioxygen, released from the three kinds of chloroplasts of plant leaves under different illumination, is monitored by the Nafion/MV modified gold microsensor. In order to survey the dioxygen concentration in vivo, a Nafion/MV modified carbon fiber microelectrode (CFME) is fabricated by a modification procedure similar to that of the Nafion/MV GDME. As a preliminary test, the dioxygen levels in the different areas of rat brain are determined by the Nafion/MV modified carbon fiber microsensors. The mechanism of the catalytic reaction is also addressed. 相似文献