全文获取类型
收费全文 | 19952篇 |
免费 | 2092篇 |
国内免费 | 4727篇 |
专业分类
化学 | 16043篇 |
晶体学 | 441篇 |
力学 | 983篇 |
综合类 | 371篇 |
数学 | 3722篇 |
物理学 | 5211篇 |
出版年
2024年 | 51篇 |
2023年 | 242篇 |
2022年 | 746篇 |
2021年 | 678篇 |
2020年 | 588篇 |
2019年 | 484篇 |
2018年 | 466篇 |
2017年 | 670篇 |
2016年 | 779篇 |
2015年 | 633篇 |
2014年 | 1036篇 |
2013年 | 1552篇 |
2012年 | 1770篇 |
2011年 | 1121篇 |
2010年 | 972篇 |
2009年 | 1214篇 |
2008年 | 1314篇 |
2007年 | 1412篇 |
2006年 | 1290篇 |
2005年 | 1193篇 |
2004年 | 1068篇 |
2003年 | 931篇 |
2002年 | 824篇 |
2001年 | 657篇 |
2000年 | 671篇 |
1999年 | 607篇 |
1998年 | 524篇 |
1997年 | 463篇 |
1996年 | 448篇 |
1995年 | 392篇 |
1994年 | 367篇 |
1993年 | 279篇 |
1992年 | 302篇 |
1991年 | 227篇 |
1990年 | 186篇 |
1989年 | 132篇 |
1988年 | 102篇 |
1987年 | 73篇 |
1986年 | 86篇 |
1985年 | 63篇 |
1984年 | 47篇 |
1983年 | 19篇 |
1982年 | 29篇 |
1981年 | 17篇 |
1980年 | 8篇 |
1979年 | 7篇 |
1978年 | 4篇 |
1977年 | 9篇 |
1972年 | 3篇 |
1959年 | 5篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
《Journal of Coordination Chemistry》2012,65(2):165-173
The title complex has been synthesized and characterized by elemental and thermal analysis, IR and electronic spectroscopy, conductivity studies and X-ray crystallography. In the crystal, the complex has two-fold symmetry and the copper atom adopts square pyramidal coordination. Bond valences for Cu were computed. Cu–O(propionate) bonds are slightly stronger than the Cu–N bonds, and the Cu–O(water) bond is distinctly weaker. Molecules are linked by O–H···O hydrogen bonds to form infinite hydrogen-bonded chains along the y axis. 相似文献
82.
《Journal of Coordination Chemistry》2012,65(14):2243-2266
AbstractThe Cu(II) ion-based polymeric complexes [Cu(2,2′-bpy).(N3)2]n (I), [Cu2(2,2′-bpy)2.(N3)4]n (II), and monomeric complex [Cu(2,2′-bpy).(NO3)2].5H2O (III) have been synthesized with rigid (–N3) and aromatic (2,2′-bpy = 2,2′-bipyridyl) ligand. The rigid azide group is responsible for the formation of 1-D extended structures in complexes I and II where as in the case of complex III, a monomeric complex is formed due to lack of a bridging group like –N3, resulting in limitation in dimensionality. The thermal stability of the 1-D complexes is comparatively higher than monomeric complex III. Hirshfeld surface analysis has also been applied to investigate other weak interactions and compared with the results from single-crystal X-ray data. Due to the presence of paramagnetic metal centers and long metal···metal distances in complexes I and II and presence of lattice water molecules in complex III, decrease in luminescence intensities have been observed. To attain further insights into the aforementioned interesting species, some chemical concepts such as highest occupied molecular orbital–lowest unoccupied molecular orbital gap, electronic chemical potential, chemical hardness, and electrophilicity index, identified as a derivative of electronic energy, have also been emphasized employing the quantum chemical calculations in the framework of the density functional theory method using the M06-2X/ 6-31G** level of study. Further, these complexes have been used to synthesize copper nanoparticles by applying a green synthetic route. 相似文献
83.
Styrene–norbornene (S‐N) copolymerizations were carried out using β‐diketiminato nickel complexes CH{C(CF3)NAr}2NiBr (Ar = 2,6‐iPr2C6H3, 1 ; Ar = 2,6‐Me2C6H3, 2 ) in the presence of methylaluminoxane. The influence of the comonomer feed content and polymerization temperature on the conversion and composition of the copolymers with the catalytic system was investigated. An increase in the feed ratio of S/N led to an increase in the incorporated styrene content of the resulting copolymer. NMR characterization of the copolymers generated with the catalytic systems showed that the random S‐N copolymers are produced. Differential scanning calorimetric determination of the copolymers shows higher Tg values than polystyrene, and gel permeation chromatographic measurements have shown that the copolymers possess rather narrow molecular weight distributions, suggesting that the copolymerization take place at a single active site. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
84.
Einar L. Hinrichsen Jens Feder Torstein Jøssang 《Journal of statistical physics》1986,44(5-6):793-827
By sequentially adding line segments to a line or disks to a surface at random positions without overlaps, we obtain configurations of the one- and two-dimensional random sequential adsorption (RSA) problem. We have simulated the one- and two-dimensional problem with periodic boundary condition. The one-dimensional simulations are compared with the exact analytical solutions to give an estimate of the accuracy of the simulation. In two dimensions the geometrical properties of the RSA configuration are discussed and in addition known results of the RSA process are reproduced. Various statistical distributions of the Voronoi-Dirichlet (VD) network corresponding to the RSA disk configuration are analyzed. In order to characterize pores in the RSA configuration, we introduce circular holes. There is a direct correspondence between vertices of the VD network and these holes, and also between direct/indirect geometrical neighbors and these holes. The hole size distribution is found to be a parabola. We also find general relations that connect the asymptotic behavior of the surface coverage, the correlation function, and the hole size distribution. 相似文献
85.
You Ming-Chang 《International Journal of Infrared and Millimeter Waves》1986,7(6):919-925
The configurations of the coupling network, which can effectively aecrease the effect of the noise sources within the amplifier on the equivalent input noise of the whole pyroelectric detector-amplifier system, are studied. The influences of feedback upon the noise properties of the basic amplifiers are analyzed. The procedures of designing low-noise pyroelectric detector-amplifier systems are followed. 相似文献
86.
A path-integral Monte Carlo algorithm for the simulation of electrons solvated in polar liquids is briefly outlined, and results
are presented for the electron solvated in liquid water. 相似文献
87.
88.
本文将局域互联神经网络的新概念推广到两维情形,并对两维局域互联关联存储进行了理论分析和大量的计算机模拟.结果表明,两维局域互联神经网络的优点是,在满足存储容量限制的前提下,它与全局互联神经网络具有相同的关联存储能力,而其互联权重矩阵要比全局互联网络小得多.因而,有利于使用现有的空间光调制器实现两维大规模的人工神经网络. 相似文献
89.
乌药含有呋喃倍半萜、黄酮、生物碱、挥发油等多种化学成分,具有抗氧化、抗肿瘤及抑菌等活性.为研究乌药化学成分的性质,计算了乌药化学成分的分子连接性指数和电性拓扑状态指数,并筛选分子连接性指数中的0X,5X和5Xc,以及电性拓扑状态指数中的E1,E2和E3,将这6种结构指数作为神经网络的输入层变量,色谱保留时间作为输出层变量,做回归分析,采用6∶5∶1的神经网络结构,构建了预测能力较强的预测模型.该模型总相关系数rt为0.994 0,训练集相关系数为0.992 9,测试集相关系数为0.997 0,验证集相关系数为0.997 9,利用该模型计算得到的保留时间预测值与实验值吻合度较好,相对平均误差为2.66%.结果表明,乌药化学成分的色谱保留时间与6种结构参数之间具有良好的非线性关系. 相似文献
90.
研究了二乙氨基环硫丙烷在三氟化硼-四氢呋喃络合物(RF3·THF)催化下的聚合反应.与使用BF3·Et2O作催化剂时聚合物沉淀析出的情况不同,在BF3·THF催化下,可得到均相粘性聚合物,而且部分四氢呋喃参与了共聚合反应.通过改变催化剂和溶剂的用量以及单体的加料方式制得了一系列组成和分子量不同的共聚物,用元素分析、核磁、红外、分子量测定等测试手段对聚合物进行了表征,还讨论了聚合反应的机理. 相似文献