全文获取类型
收费全文 | 25307篇 |
免费 | 3158篇 |
国内免费 | 3366篇 |
专业分类
化学 | 14223篇 |
晶体学 | 282篇 |
力学 | 755篇 |
综合类 | 264篇 |
数学 | 1967篇 |
物理学 | 5816篇 |
无线电 | 8524篇 |
出版年
2024年 | 64篇 |
2023年 | 336篇 |
2022年 | 522篇 |
2021年 | 670篇 |
2020年 | 634篇 |
2019年 | 707篇 |
2018年 | 628篇 |
2017年 | 568篇 |
2016年 | 919篇 |
2015年 | 1047篇 |
2014年 | 1242篇 |
2013年 | 1700篇 |
2012年 | 1910篇 |
2011年 | 1978篇 |
2010年 | 1596篇 |
2009年 | 1593篇 |
2008年 | 1881篇 |
2007年 | 1734篇 |
2006年 | 1604篇 |
2005年 | 1396篇 |
2004年 | 1275篇 |
2003年 | 1150篇 |
2002年 | 1294篇 |
2001年 | 1092篇 |
2000年 | 814篇 |
1999年 | 614篇 |
1998年 | 388篇 |
1997年 | 390篇 |
1996年 | 344篇 |
1995年 | 299篇 |
1994年 | 243篇 |
1993年 | 235篇 |
1992年 | 201篇 |
1991年 | 146篇 |
1990年 | 132篇 |
1989年 | 108篇 |
1988年 | 68篇 |
1987年 | 62篇 |
1986年 | 43篇 |
1985年 | 43篇 |
1984年 | 30篇 |
1983年 | 22篇 |
1982年 | 14篇 |
1981年 | 16篇 |
1980年 | 12篇 |
1978年 | 13篇 |
1977年 | 9篇 |
1976年 | 9篇 |
1974年 | 6篇 |
1973年 | 7篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
Kyung Hwa Hong Jong Lyoul Park In Hwan Sul Ji Ho Youk Tae Jin Kang 《Journal of Polymer Science.Polymer Physics》2006,44(17):2468-2474
Polyvinyl alcohol (PVA) nanofibers containing Ag nanoparticles were prepared by electrospinning PVA/silver nitrate (AgNO3) aqueous solutions, followed by short heat treatment, and their antimicrobial activity was investigated for wound dressing applications. Since PVA is a water soluble and biocompatible polymer, it is one of the best materials for the preparation of wound dressing nanofibers. After heat treatment at 155 °C for 3 min, the PVA/AgNO3 nanofibers became insoluble, while the Ag+ ions therein were reduced so as to produce a large number of Ag nanoparticles situated preferentially on their surface. The residual Ag+ ions were reduced by subsequent UV irradiation for 3 h. The average diameter of the Ag nanoparticles after the heat treatment was 5.9 nm and this value increased slightly to 6.3 nm after UV irradiation. It was found that most of the Ag+ ions were reduced by the simple heat treatment. The PVA nanofibers containing Ag nanoparticles showed very strong antimicrobial activity. © 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 2468–2474, 2006 相似文献
62.
We have performed total-energy calculations to study theoretical scanning tunneling microscopy (STM) images of the Si(1 1 1)3 × 2 surfaces induced by the adsorption of alkaline-earth metals (AEMs). Previously, in a series of works on Ba/Si(1 1 1) system, we have found that the observed Si(1 1 1)3 × 1-Ba LEED phase indeed has a 3 × 2 periodicity with a Ba coverage of 1/6 ML and the HCC substrate structure. Based on results of the Ba case, we proposed that the HCC structure is also adopted for other AEM atoms, which was confirmed by our recent work. In this paper, we mainly report the STM simulations for different AEM systems to compare with existing experimental data. We discuss the difference in the detailed STM images for different AEM adsorbates. Especially, the difference in filled-state images between Mg and other AEM atoms is attributed to the strong Mg-Si interaction. 相似文献
63.
64.
65.
Recent experiments revealed that the dielectric dispersion spectrum of fission yeast cells in a suspension was mainly composed of two sub-dispersions. The low-frequency sub-dispersion depended on the cell length, while the high-frequency one was independent of it. The cell shape effect was simulated by an ellipsoidal cell model but the comparison between theory and experiment was far from being satisfactory. Prompted by the discrepancy, we proposed the use of spectral representation to analyze more realistic cell models. We adopted a shell-spheroidal model to analyze the effects of the cell membrane. It is found that the dielectric property of the cell membrane has only a minor effect on the dispersion magnitude ratio and the characteristic frequency ratio. We further included the effect of rotation of dipole induced by an external electric field, and solved the dipole-rotation spheroidal model in the spectral representation.Good agreement between theory and experiment has been obtained. 相似文献
66.
67.
利用莫尔条纹的准正弦特性的三维轮廓术 总被引:5,自引:0,他引:5
分析了两个矩形光栅迭合产生的莫尔条纹的光强分布特性,通过选择适当的光栅参数,可得到一个近似的正弦分划板,并把它用于三维面形测量中,实验结果表明,这种方法简单,易于自动处理,有广泛的实用价值。 相似文献
68.
在本试验中,采用智能同步广播激励器和CCTV传输的1MHz标频,实现了中波同步广播同频保护率趋于0dB.并提出了自适应相位跟踪同步的概念。 相似文献
69.
介质加载圆柱腔的场分析 总被引:1,自引:0,他引:1
本文应用严格场匹配法解决了介质加载圆柱腔的本征问题,计算了圆柱腔在纵向部分填充介质后TE01n模和TM01n模的本征频率和本征场型的变化。特别分析了本征模式在空气段为截止模的情况。本文的分析方法亦可应用到纵向部分填充介质的传输线和其它形状的谐振腔。 相似文献
70.