全文获取类型
收费全文 | 10562篇 |
免费 | 1743篇 |
国内免费 | 1462篇 |
专业分类
化学 | 8451篇 |
晶体学 | 111篇 |
力学 | 496篇 |
综合类 | 103篇 |
数学 | 1294篇 |
物理学 | 3312篇 |
出版年
2024年 | 24篇 |
2023年 | 205篇 |
2022年 | 253篇 |
2021年 | 314篇 |
2020年 | 392篇 |
2019年 | 408篇 |
2018年 | 357篇 |
2017年 | 279篇 |
2016年 | 470篇 |
2015年 | 500篇 |
2014年 | 576篇 |
2013年 | 738篇 |
2012年 | 862篇 |
2011年 | 889篇 |
2010年 | 656篇 |
2009年 | 648篇 |
2008年 | 714篇 |
2007年 | 652篇 |
2006年 | 606篇 |
2005年 | 531篇 |
2004年 | 484篇 |
2003年 | 451篇 |
2002年 | 479篇 |
2001年 | 329篇 |
2000年 | 277篇 |
1999年 | 304篇 |
1998年 | 223篇 |
1997年 | 193篇 |
1996年 | 162篇 |
1995年 | 137篇 |
1994年 | 112篇 |
1993年 | 66篇 |
1992年 | 73篇 |
1991年 | 75篇 |
1990年 | 53篇 |
1989年 | 39篇 |
1988年 | 37篇 |
1987年 | 30篇 |
1986年 | 31篇 |
1985年 | 29篇 |
1984年 | 24篇 |
1983年 | 12篇 |
1982年 | 11篇 |
1981年 | 7篇 |
1980年 | 10篇 |
1979年 | 6篇 |
1976年 | 7篇 |
1975年 | 5篇 |
1974年 | 4篇 |
1968年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 304 毫秒
51.
A novel Y-branch waveguide with two reflectors is proposed. The normalized transmitted power for the branching angle of 50°is greater than 70%, which is higher than conventional Y-branch with such wide angle. 相似文献
52.
Tm3+/Yb3+-codoped germanate-niobic (GN) and germanium-bismuth (GB) glasses have been synthesized by conventional melting and quenching method. Intense blue and weak red emissions centered at 477 and 650 nm, corresponding to the transitions 1G4→3H6 and 1G4→3H4, respectively, were observed at room temperature. The possible up-conversion mechanisms are discussed and estimated. GN glass showed a weaker up-conversion emission than GB glass, which is inconsistent with the prediction from the difference of maximum phonon energy between GN and GB glasses. In this paper, Raman spectroscopy was employed to investigate the origin of the difference in up-conversion luminescence in the two glasses. Compared with phonon side-band spectroscopy, Raman spectroscopy extracts more information including both phonon energy and phonon density. For the first time, our results reveal that, besides the maximum phonon energy, the phonon density of host glasses is also an important factor in determining the up-conversion efficiency. 相似文献
53.
技术联盟的共生演化分析 总被引:1,自引:0,他引:1
企业组建技术联盟的根本目的,就是基于自己能力缺陷,分散风险,降低研发成本,共享技术收益,是一个典型的利益共生体.Logistic生物种群共生进化模型给技术联盟共生体提供了一个分析框架.分析结果表明:对于主体不均等的技术联盟,主导企业从合作伙伴中获得的收益是非常有限的,远远低于自己对伙伴企业的贡献,并且这种联盟方式要求企业之间的分工程度要高;而对于主体均等的技术联盟而言,双方的贡献相差不大,都相对比较小.技术联盟企业通过分工形式形成各种关系,以激烈的竞争维持着共生模式的稳定性. 相似文献
54.
55.
K. J. Ellis R. J. Shypailo H. -P. Sheng W. G. Pond 《Journal of Radioanalytical and Nuclear Chemistry》1992,157(1):159-168
Characteristic gamma-rays are emitted promptly by elements during exposure to neutrons. These emissions enable a radioanalytical analysis of the body's composition of protein (nitrogen), water (hydrogen), and fat (carbon). We have used this method in vivo to determine the body composition of obese and lean pigs (10 to 20 kg body wt) fed an altered cholesterol diet. 相似文献
56.
单模光纤中皮秒啁啾脉冲压缩 总被引:11,自引:2,他引:9
对单模光纤正群速色散区秒啁啾脉冲的非线性传进行了近似的解析分析和定量的数值计算。结果表明,负啁啾脉冲在传输过程中能得到有效压缩。压缩比与脉冲初始峰值功率和初始啁啾程度有关。初始峰值功率一定的脉冲,其压缩比随初始啁啾程度的增大面大,初始啁啾程度一定的脉冲,压缩比随初始峰值功率的增大而减小,表明自相位调制效应导致脉冲压缩效果变差。计算结果还表明,在脉冲时域宽度得到压缩的同时,光谱宽度也能得到同步压缩。 相似文献
57.
Sheng‐Huei Hsiao Chien‐Wei Chen Guey‐Sheng Liou 《Journal of polymer science. Part A, Polymer chemistry》2004,42(13):3302-3313
Two new diamines, 2,4‐diaminotriphenylamine ( 3 ) and N‐(2,4‐diaminophenyl)carbazole ( 4 ), were synthesized via the cesium fluoride‐mediated aromatic substitution reactions of 1‐fluoro‐2,4‐dinitrobenzene with diphenylamine and carbazole, followed by palladium‐catalyzed hydrazine reduction. Amorphous and soluble aramids having pendent diphenylamino and carbazolyl groups were prepared by the phosphorylation polycondensation of aromatic dicarboxylic acids with diamines 3 and 4 , respectively. The aramids derived from diamine 3 had sufficiently high molecular weights to permit the casting of flexible and tough films. They exhibited excellent mechanical properties and moderately high softening temperatures in the 221–298 °C range. However, the reactions of diamine 4 with aromatic diacids gave relatively lower molecular weights products that could not afford flexible films. For a comparative purpose, the parent aramids derived from m‐phenylenediamine and aromatic diacids were also prepared and characterized. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 3302–3313, 2004 相似文献
58.
Xiao‐Hui Liu Yan‐Guo Li Ying Lin Yue‐Sheng Li 《Journal of polymer science. Part A, Polymer chemistry》2007,45(7):1272-1281
The reversible addition–fragmentation chain transfer (RAFT) polymerization of acrylonitrile (AN) mediated by 2‐cyanoprop‐2‐yl dithiobenzoate was first applied to synthesize polyacrylonitrile (PAN) with a high molecular weight up to 32,800 and a polydispersity index as low as 1.29. The key to success was ascribed to the optimization of the experimental conditions to increase the fragmentation reaction efficiency of the intermediate radical. In accordance with the atom transfer radical polymerization of AN, ethylene carbonate was also a better solvent candidate for providing higher controlled/living RAFT polymerization behaviors than dimethylformamide and dimethyl sulfoxide. The various experimental parameters, including the temperature, the molar ratio of dithiobenzoate to the initiator, the molar ratio of the monomer to dithiobenzoate, the monomer concentration, and the addition of the comonomer, were varied to improve the control of the molecular weight and polydispersity index. The molecular weights of PANs were validated by gel permeation chromatography along with a universal calibration procedure and intrinsic viscosity measurements. 1H NMR analysis confirmed the high chain‐end functionality of the resultant polymers. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 1272–1281, 2007 相似文献
59.
60.