全文获取类型
收费全文 | 10735篇 |
免费 | 1911篇 |
国内免费 | 1258篇 |
专业分类
化学 | 7756篇 |
晶体学 | 69篇 |
力学 | 661篇 |
综合类 | 79篇 |
数学 | 1072篇 |
物理学 | 4267篇 |
出版年
2024年 | 43篇 |
2023年 | 278篇 |
2022年 | 384篇 |
2021年 | 437篇 |
2020年 | 483篇 |
2019年 | 427篇 |
2018年 | 355篇 |
2017年 | 302篇 |
2016年 | 525篇 |
2015年 | 467篇 |
2014年 | 566篇 |
2013年 | 805篇 |
2012年 | 990篇 |
2011年 | 981篇 |
2010年 | 640篇 |
2009年 | 638篇 |
2008年 | 711篇 |
2007年 | 621篇 |
2006年 | 550篇 |
2005年 | 477篇 |
2004年 | 369篇 |
2003年 | 325篇 |
2002年 | 276篇 |
2001年 | 217篇 |
2000年 | 216篇 |
1999年 | 253篇 |
1998年 | 213篇 |
1997年 | 191篇 |
1996年 | 205篇 |
1995年 | 175篇 |
1994年 | 142篇 |
1993年 | 124篇 |
1992年 | 102篇 |
1991年 | 74篇 |
1990年 | 84篇 |
1989年 | 56篇 |
1988年 | 48篇 |
1987年 | 44篇 |
1986年 | 29篇 |
1985年 | 28篇 |
1984年 | 14篇 |
1983年 | 9篇 |
1982年 | 13篇 |
1981年 | 8篇 |
1980年 | 5篇 |
1979年 | 3篇 |
1957年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
21.
The clusters of Eu3+ ion in Eu(DBM)3Phen-doped polymethyl methacrylate (PMMA) have been studied by three means. The relative fluorescence intensity ratio of the 5D0 → 7F2 to 5D0 → 7F1 transitions with different concentrations of Eu3+ in Eu(DBM)3Phen-doped PMMA and metastable-state (5D0) lifetime dependence on Eu3+ concentration are analyzed. The analysis indicates that there are no clustering effects in Eu3+ ions of Eu(DBM)3Phen-doped PMMA when the Eu3+ doping concentration is up to 1.0 wt.-%. At the same time, the clustering effect has not been observed by the scanning near-field optical microscopy (SNOM) in Eu(DBM)3Phen-doped PMMA with 1.0 wt.-% of Eu3+ ions. The analysis reveals that a high concentration of Eu3+ can be incorporated into polymer optical fiber (POF) without clustering effect.OCIS codes: 180.5810, 300.6280, 250.5460, 160.5690. 相似文献
22.
23.
本在Glover—Klingman算法及最小费用支撑树对策的基础上,讨论了最小费用k度限制树对策问题.利用威胁、旁支付理论制订了两种规则,并利用优超、策略等价理论分别给出了在这两种规则下最小费用k度限制树对策核心中的解,从而证明了在这两种规则下其核心非空. 相似文献
24.
Chunlin Li Yilu Fu Guozhu Bian Tiandou Hu Yaning Xie Jing ZhanDepartment of Chemical Physics University of Science and Technology of China Hefei China Institute of High Energy Physics Chinese Academy of Sciences Beijing China 《天然气化学杂志》2003,12(3)
The Ni/CeO2-ZrO2-Al2O3 catalyst with different Al2O3 and NiO contents were prepared by hydrothermal synthesis method. The catalytic performance for CO2 reforming of CH4 reaction, the interaction among components and the relation between Ni content and catalyst surface basicity were investigated. Results show that the interaction between NiO and Al2O3 is stronger than that between NiO and CeO2-ZrO2.The addition of Al2O3 can prevent the formation of large metallic Ni ensembles, increase the dispersion of Ni, and improve catalytic activity, but excess Al2O3 causes the catalyst to deactivate easily. The interaction between NiO and CeO2 results in more facile reduction of surface CeO2. The existence of a small amount of metallic Ni can increase the number of basic sites. As metallic Ni may preferentially reside on the strong basic sites, increasing Ni content can weaken the catalyst basicity. 相似文献
25.
26.
27.
28.
本文得到了正定Hermitian阵的Hadamard积的Schur补的一些不等式,进而,给出了他们的一些应用,这些改进了近期的一些结束. 相似文献
29.
原子吸收法在有机分析中的应用(Ⅵ)香烟中氢氰酸的分析 总被引:3,自引:0,他引:3
原子吸收法在有机分析中的应用(Ⅵ)香烟中氢氰酸的分析谢志海,郎惠云,高云(西北大学化学系,西安,710069)关键词:氢氰酸,测定,原子吸收光谱香烟中的尼古丁,烟焦油等含氮有机物燃烧后将产生氢氰酸,吸入人体后极为有害。国外在这方面的研究始于七十年代,... 相似文献
30.
Measurement of small-signal and large-signal responses of packaged laser modules at high temperature
Ning Hua Zhu Ji Min Wen Hai Peng Song Shang Jian Zhang Liang Xie 《Optical and Quantum Electronics》2006,38(15):1245-1257
In this paper, the pulsed injection method is extended to measure the chip temperature of various packaged laser modules,
such as the DFB laser modules, the FP laser modules, and the EML laser modules. An optimal injection condition is obtained
by investigating the dependence of the lasing wavelength on the width and period of the injection pulse in a relatively wide
temperature range. The small-signal frequency responses and large-signal performances of packaged laser modules at different
chip temperature are measured. The adiabatic small-signal modulation characteristics of packaged LD are first extracted. In
the large-signal measurement, the effects of chip temperature, bias current and driving signal on the performances of the
laser modules are discussed. It has been found that the large-signal performances of the EML modules depend on the different
red-shift speeds of the DFB and EAM sections as chip temperature varying, and the optimal characteristics may be achieved
at higher temperature. 相似文献