全文获取类型
收费全文 | 813篇 |
免费 | 11篇 |
国内免费 | 4篇 |
专业分类
化学 | 582篇 |
晶体学 | 7篇 |
力学 | 3篇 |
数学 | 23篇 |
物理学 | 160篇 |
无线电 | 53篇 |
出版年
2022年 | 4篇 |
2021年 | 5篇 |
2020年 | 10篇 |
2019年 | 9篇 |
2018年 | 7篇 |
2016年 | 7篇 |
2015年 | 10篇 |
2014年 | 15篇 |
2013年 | 73篇 |
2012年 | 28篇 |
2011年 | 29篇 |
2010年 | 16篇 |
2009年 | 16篇 |
2008年 | 25篇 |
2007年 | 36篇 |
2006年 | 29篇 |
2005年 | 37篇 |
2004年 | 29篇 |
2003年 | 33篇 |
2002年 | 30篇 |
2001年 | 16篇 |
2000年 | 14篇 |
1999年 | 10篇 |
1998年 | 16篇 |
1997年 | 10篇 |
1996年 | 10篇 |
1995年 | 13篇 |
1994年 | 13篇 |
1993年 | 10篇 |
1992年 | 13篇 |
1991年 | 17篇 |
1990年 | 17篇 |
1989年 | 10篇 |
1988年 | 11篇 |
1987年 | 7篇 |
1986年 | 12篇 |
1985年 | 18篇 |
1984年 | 18篇 |
1983年 | 12篇 |
1982年 | 7篇 |
1981年 | 13篇 |
1980年 | 26篇 |
1979年 | 14篇 |
1978年 | 10篇 |
1977年 | 5篇 |
1976年 | 8篇 |
1975年 | 8篇 |
1974年 | 13篇 |
1973年 | 9篇 |
1969年 | 3篇 |
排序方式: 共有828条查询结果,搜索用时 9 毫秒
101.
Kentaro Kimura Hideharu Sato Atsushi Kameyama Tadatomi Nishikubo 《Journal of polymer science. Part A, Polymer chemistry》2000,38(18):3399-3404
The polycondensation of bis(4‐mercaptophenyl) sulfide (BMPS) with bis(4‐chloro‐3‐nitrophenyl) sulfone (BCNPS) was examined using various organic or inorganic bases in mixed solvents of N‐methyl‐2‐pyrrolidone (NMP) with water or in plain water. The reaction of BMPS with BCNPS proceeded smoothly to give the corresponding polysulfide in mixed solvents of NMP with water at 60 °C using 1,8‐diazabicyclo[5.4.0]undecene‐7 as a base, although the rate of the reaction decreased gradually as the water in the solvent increased. Polysulfide can also be obtained by reaction in plain water using appropriate organic bases such as tripropylamine (TPA) or quinoline. The polysulfide with a number‐average molecular weight of 45,100 was synthesized in 62% yield when the reaction of BMPS with BCNPS was performed using TPA as a base at 60 °C for 48 h in plain water. © 2000 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 38: 3399–3404, 2000 相似文献
102.
103.
Akito Kobayashi Yoshiaki
no Tamifusa Matsuura Yoshihiro Kuroda 《Physica C: Superconductivity and its Applications》1998,300(3-4):287-300
Dynamical spin susceptibility χs(q,ω) of the d–p model in the over doping region is investigated by using the auxiliary boson technique. It includes higher order terms of the 1/N-expansion within the random phase approximation (RPA) of the local vertex, where frequency dependence of the quasi-particle interaction is taken into account. The incommensurate spin fluctuation is obtained due to the nesting effect in the low energy region (ωω*), whereas the commensurate one in the high energy region (ωω*), the characteristic energy ω* is estimated to be about 30 meV. Both of the spin–lattice relaxation rate 1/T1 and the spin–spin relaxation rate 1/Tg monotonically increase as T decreases, while the spin Knight shift K is almost independent of T. 相似文献
104.
105.
Kobayashi J. Matsuura T. Hida Y. Sasaki S. Maruno T. 《Lightwave Technology, Journal of》1998,16(6):1024-1029
Fluorinated polyimide waveguides with low polarization dependent loss (PDL) and thermooptic (TO) switches made from them were demonstrated. The waveguides showed loss of less than 0.3 dB/cm at the wavelength of 1.3 μm and 0.6 dB/cm at 1.55 μm for both TE and TM polarizations. The PDL's were less than 0.1 dB/cm. Extinction ratios of Y-branching-type TO switches fabricated from these waveguides were larger than 20 dB when over 160 mW of electric power was applied at 1.3 μm, and over 150 mW at 1.55 μm. The switching speed was faster than 8 ms 相似文献
106.
107.
Keiichi Ohno Hiroatsu Matsuura Don McNaughton Harold W. Kroto 《Journal of Molecular Spectroscopy》1985,111(2):415-424
The infrared spectra of 1-phosphapropyne, CH3CP, and its perdeuteride, CD3CP, have been measured in the gaseous and solid states. The QK branches of perpendicular bands have been analyzed in terms of the usual quadratic expression in K. Fermi resonances were identified for the ν1, ν2 + ν3, 2ν3, 2ν60; and ν5, 2ν3 + ν8 band systems of CH3CP and the ν1, 2ν3, 2ν60; ν6, ν7 + ν8; and ν7, 3ν81 band systems of CD3CP. The xy Coriolis interaction was also identified between the ν3 and ν6 bands of the two species. All the fundamentals were assigned and the normal coordinate treatment was carried out along with the Coriolis constants, ζz. 相似文献
108.
109.
Shuji Matsuura Pin Chen Geoffrey A. Blake J. C. Pearson Herbert M. Pickett 《International Journal of Infrared and Millimeter Waves》1998,19(6):849-858
Two-frequency operation of an 850 nm semiconductor optical amplifier was achieved by simultaneously injection seeding it with two diode lasers. The two frequencies could be independently amplified without strong interference when they were separated by more than 10 GHz, and the spectral purity was preserved by the amplification process. At frequency differences below 10 GHz, unbalanced two-frequency output was observed, which can be explained by a two-mode interaction driven by the refractive index modulation at the beat frequency. The laser system is suitable for the difference-frequency generation of coherent terahertz radiation in ultra-fast photoconductors or nonlinear optical media. 相似文献
110.
Irradiation of 5-iodouridine or 6-iodo-1,3-dimethyluracil in aq. acetonitrile in the presence of allyltrimethylsilane provided the corresponding 5- or 6-allylated product. 相似文献