全文获取类型
收费全文 | 11259篇 |
免费 | 2060篇 |
国内免费 | 1475篇 |
专业分类
化学 | 5093篇 |
晶体学 | 214篇 |
力学 | 427篇 |
综合类 | 149篇 |
数学 | 806篇 |
物理学 | 3111篇 |
无线电 | 4994篇 |
出版年
2024年 | 45篇 |
2023年 | 244篇 |
2022年 | 396篇 |
2021年 | 467篇 |
2020年 | 457篇 |
2019年 | 460篇 |
2018年 | 434篇 |
2017年 | 478篇 |
2016年 | 560篇 |
2015年 | 689篇 |
2014年 | 780篇 |
2013年 | 982篇 |
2012年 | 1093篇 |
2011年 | 1063篇 |
2010年 | 869篇 |
2009年 | 872篇 |
2008年 | 854篇 |
2007年 | 762篇 |
2006年 | 647篇 |
2005年 | 597篇 |
2004年 | 423篇 |
2003年 | 312篇 |
2002年 | 269篇 |
2001年 | 223篇 |
2000年 | 187篇 |
1999年 | 137篇 |
1998年 | 66篇 |
1997年 | 72篇 |
1996年 | 71篇 |
1995年 | 65篇 |
1994年 | 29篇 |
1993年 | 35篇 |
1992年 | 35篇 |
1991年 | 26篇 |
1990年 | 17篇 |
1989年 | 16篇 |
1988年 | 7篇 |
1987年 | 8篇 |
1986年 | 6篇 |
1985年 | 8篇 |
1984年 | 3篇 |
1983年 | 7篇 |
1982年 | 9篇 |
1981年 | 3篇 |
1980年 | 6篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1936年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 14 毫秒
71.
Tian Le LIN Bao Zhen YAN Gao Fei HU Mei WANG 《中国化学快报》2006,17(7):937-940
Complex formation between aluminium and quercetin(Q) in methanol was investigated by means of 27^Al solid-state, 13^C and 1^H NMR and MS(ESI), UV and IR spectra. Formation of the 1:2 complex was favored in methanol relative to all other solvent and the predominant species observed of Al(Ⅲ) has a 1:2 stoichiometry. The fine structure of 1:2 aluminum complex of quercetin was that the aluminum central atom chelated with two quereetin molecules and two methoxyl groups between two five membered rings, its coordination is six, the chelated site was 3-hydroxy-4-carbonyl. 相似文献
72.
73.
从蛙虹彩病毒(Rana gryliovirus,RGV)基因组中克隆了含凋亡相关结构域的新基因-cop(Caspaserecruit ment domain only protein,COP)基因的全部编码区,成功构建了重组表达载体,进行了原核表达,并在鲤鱼上皮瘤细胞(Epithelioma papulosumcyprini,EPC)中进行了亚细胞定位.序列分析表明,RGVcop基因全长288 bp,编码一个长为95 aa,分子量为10.4×103的推定蛋白.二级结构预测表明其含有5个α螺旋.同源性比对分析显示,RGVcop与其他6株虹彩病毒及人类cop相关蛋白同源性最高为94%,最低为33%.重组原核表达质粒pET28a-COP转化大肠杆菌BL21后,经IPTG诱导表达,获得一条约14×103的融合蛋白.重组真核表达质粒pEGFPN3-COP转染EPC细胞,经DAPI染色后,在荧光显微镜下观察显示重组蛋白在整个细胞中均有分布. 相似文献
74.
Optical Recording Properties of Metal-Azo Dye as Recording Medium with Super-Resolution Near-Field Structure 下载免费PDF全文
A novel metallized azo dye has been synthesized. The absorption spectra of the thin film and thermal characteristic are measured. Static optical recording properties with and without the Bi mask layer super-resolution near-field structure (Super-RENS) of the metal-azo dye are investigated. The results show that the metal-azo dye film has a broad absorbance band in the region of 450-650 nm and the maximum absorbance wavelength is located at 603 nm. It is also found that the new metallized azo dye occupies excellent thermal stability, initiatory decomposition temperature is at 270℃ and the mass loss is about 48% in a narrow temperature region (15℃). The complex refractive index N (N = n + iκ) is measured. High refractive index (n = 2.45) and low extinction coefficient (κ = 0.2) at the recording wavelength 65Ohm are attained. Static optical recording tests with and without Super-RENS are carried out using a 65Ohm semiconductor diode laser with recording power of 7mW and laser pulse duration of 200ns. The AFM images show that the diameter of recording mark on the dye film with the Bi mask layer is reduced about 42%, compared to that of recorded mark on the dye film without Super-RENS. It is indicated that Bi can well performed as a mask layer of the dye recording layer and the metallized azo dye can be a promising candidate for recording media with the super-resolution near-field structure. 相似文献
75.
In Situ Observation of Skeletal Shape Transition during BaB2O4 Crystal Growth in High-Temperature Solution 下载免费PDF全文
The transition from a fiat solid-liquid interface to a skeletal shape during BaB2O4 (BBO) single crystal growth in Li2B4O7 flux is observed in real time by an optical high-temperature in-situ observation system. The movement of crystal step is also investigated. The observation results demonstrate that the steps propagate along and parallel to the fiat interface when the crystal size is small. Nevertheless, they will ‘bend' close to the face centre if the crystal size becomes greater. Atomic force microscopy reveals that more deposition places near the face centre give rise to the bending of advancing steps and thus the formation of a vicinal interface structure. Measurements of step velocity show that the velocity keeps nearly constant at different moments for one specific step, whereas the step on a newly formed layer advanced faster than that on a previously formed one when the crystal size is larger than 210μm or so. Thus interracial morphological instability occurs and a skeletal interface is obtained. 相似文献
76.
77.
78.
对于采用连锁经营的汽车零件销售企业来说,各经营网点分布在同一城市的不同区域或不同城市,为了在充分利用原有信息和资源的基础上处理好许多中间环节,减少人员工作量,保证企业销存状态良好,提高管理效率,设计了基于B/S模式的汽车零件销存管理信息系统的技术方案,详细讨论系统的功能设计以及实现技术。 相似文献
79.
80.
驻极体声传感器及其储电材料的现状 总被引:1,自引:0,他引:1
综述了驻极体声传感器及其储电材料近年来的迅猛发展。传统的FEP(tetrafluoroethylene—hexa—fluoropropylene copolymer)极体电容式声传感器及以铁电聚合物PVDF(poly vinylidene fluoride)家族为芯片的声传感器和超声抉能器仍焕发着青春活力。Si基微型驻极体声传感器的理论和实验研究已经日趋成熟,而用空间电荷型多孔聚合物驻极体压电薄膜为芯片可望研制出新一代声电和电声传感器、压力传感器和驱动器。 相似文献