全文获取类型
收费全文 | 84篇 |
免费 | 1篇 |
专业分类
化学 | 48篇 |
晶体学 | 2篇 |
力学 | 1篇 |
数学 | 6篇 |
物理学 | 28篇 |
出版年
2023年 | 1篇 |
2021年 | 1篇 |
2020年 | 1篇 |
2016年 | 1篇 |
2015年 | 3篇 |
2014年 | 1篇 |
2013年 | 3篇 |
2012年 | 4篇 |
2011年 | 3篇 |
2010年 | 2篇 |
2008年 | 6篇 |
2007年 | 1篇 |
2006年 | 2篇 |
2005年 | 1篇 |
2004年 | 3篇 |
2003年 | 2篇 |
2002年 | 3篇 |
2001年 | 1篇 |
2000年 | 2篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1996年 | 2篇 |
1994年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1967年 | 1篇 |
1941年 | 2篇 |
1939年 | 1篇 |
1938年 | 2篇 |
1937年 | 1篇 |
1935年 | 3篇 |
1933年 | 4篇 |
1922年 | 2篇 |
排序方式: 共有85条查询结果,搜索用时 15 毫秒
1.
Benzo[b] thiophene derivatives. XVIII. The sulfur isosteres of harmaline,harmine and related isomers
T. R. Bosin R. P. Maickel A. Dinner A. Snell E. Campaigne 《Journal of heterocyclic chemistry》1972,9(6):1265-1266
The sulfur analogs of harmaline, 7-methoxy-3,4-dihydro-1-methyl[1]benzothieno[2,3-c]-pyridine (Ib), harmine, 7-methoxy-1-methyl[1]benzothieno[2,3- c ]pyridine (IIb), and corresponding 6-methoxy isomers (Ic and IIc) have been synthesized for pharmacological evaluation as monoamine oxidase inhibitors. 相似文献
2.
3.
We report a resonantly fiber-laser-pumped Er:YAG laser operating at the eye-safe wavelength of 1645 nm, exhibiting 43% optical efficiency and 54% incident slope efficiency and emitting 7-W average power when repetitively Q switched at 10 kHz. To our knowledge, this is the best performance (conversion efficiency and average power) obtained from a bulk solid-state Q-switched erbium laser. At a 1.1-kHz pulse repetition frequency the laser produces 3.4-mJ pulses with a corresponding peak power of 162 kW. Frequency doubling to produce 822.5-nm, 4.7-kW pulses at 10 kHz was performed to demonstrate the laser's utility. 相似文献
4.
Application of amorphous silicon field effect transistors in addressable liquid crystal display panels 总被引:1,自引:0,他引:1
A. J. Snell K. D. Mackenzie W. E. Spear P. G. LeComber A. J. Hughes 《Applied Physics A: Materials Science & Processing》1981,24(4):357-362
It is shown that thin-film field effect transistors (FETs) made from amorphous (a-) silicon deposited by the glow-discharge
technique have considerable potential as switching elements in addressable liquid crystal display panels. The fabrication
of the elements and their characteristics with steady and pulsed applied potentials are discussed in some detail. Two important
points are stressed: (i) a-Si device arrays can be produced by well-established photolithographic techniques, and (ii) satisfactory
operation at applied voltages below 15VV is possible. Small experimental 7×5 transistor panels have been investigated and
it is shown that with the present design up to 250-way multiplexing could be achieved. The reproducibility of FET characteristics
is good and in tests so far no change has been observed after more than 109 switching operations. 相似文献
5.
Illingworth CJ Parkes KE Snell CR Ferenczy GG Reynolds CA 《The journal of physical chemistry. A》2008,112(47):12151-12156
The concept of model chemistries within hybrid QM/MM calculations has been addressed through analysis of the polarization energy determined by two distinct approaches based on (i) induced charges and (ii) induced dipoles. The quantum mechanical polarization energy for four configurations of the water dimer has been determined for a range of basis sets using Morokuma energy decomposition analysis. This benchmark value has been compared to the fully classical polarization energy determined using the induced dipole approach, and the molecular mechanics polarization energy calculated using induced charges within the MM region of hybrid QM/MM calculations. From the water dimer calculations, it is concluded that the induced charge approach is consistent with medium sized basis set calculations whereas the induced dipole approach is consistent with large basis set calculations. This result is highly relevant to the concept of QM/MM model chemistries. 相似文献
6.
Kristen E. Snell Dr. Hossein Ismaili Prof. Dr. Mark S. Workentin 《Chemphyschem》2012,13(13):3185-3193
Photolysis of organic solvent soluble aryl azide‐modified gold nanoparticles (N3‐AuNPs) with a core size of 4.6±1.6 nm results in the generation of interfacial reactive nitrene intermediates. The high reactivity of the nitrenes is utilized to tether the AuNP to the native surface of carbon nanotubes, and reduce graphene oxide and micro‐diamond powder, likely via addition to π‐conjugated carbon skeleton or insertion into the functionalities at the surface, to yield the desired hybrid material without the need for pretreatment of the surface. The AuNP‐covalent hybrid materials are robust in that they survive vigorous washing and sonication. In the absence of photolysis no attachment occurs with the same N3‐AuNP. The nanohybrid AuNP‐nanohybrid materials are characterized using a combination of TEM, powder XRD, XPS and UV/Vis and IR spectroscopies. All of the characterization studies confirm the uniform incorporation of the AuNP on the irradiated substrates. 相似文献
7.
On the slope of the differential cross section for the photo- and electroproduction of vector mesons
Victor Snell 《Nuclear Physics B》1974,73(3):497-508
The photo- and electroproduction of ? mesons at high energy is examined in a simple Regge-pole model with q2 dependent residues. The behaviour of the differential cross section at t=0 and of its slope, as a function of the q2 and of the photon energy, are correlated, and good fits to the data are obtained. 相似文献
8.
9.
10.