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排序方式: 共有86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.
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
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.
E. E. Snell und F. M. Strong 《Fresenius' Journal of Analytical Chemistry》1941,122(7-8):318-320
Ohne Zusammenfassung 相似文献
6.
J. Terrier D. H. Cook J. H. Axtmayer Ira E. Puddington J. F. Snell und J. L. Perlman 《Fresenius' Journal of Analytical Chemistry》1939,117(5-6):223-225
Ohne Zusammenfassung 相似文献
7.
8.
Dan Luo Yong Xiao Liam Hardwick Robert Snell Matthew Way Xavier Sanuy Morell Frances Livera Nicholas Ludford Chinnapat Panwisawas Hongbiao Dong Russell Goodall 《Entropy (Basel, Switzerland)》2021,23(1)
In the search for applications for alloys developed under the philosophy of the High Entropy Alloy (HEA)-type materials, the focus may be placed on applications where current alloys also use multiple components, albeit at lower levels than those found in HEAs. One such area, where alloys with complex compositions are already found, is in filler metals used for joining. In soldering (<450 °C) and brazing (>450 °C), filler metal alloys are taken above their liquidus temperature and used to form a metallic bond between two components, which remain both unmelted and largely unchanged throughout the process. These joining methods are widely used in applications from electronics to aerospace and energy, and filler metals are highly diverse, to allow compatibility with a broad range of base materials (including the capability to join ceramics to metals) and a large range of processing temperatures. Here, we review recent developments in filler metals relevant to High Entropy materials, and argue that such alloys merit further exploration to help overcome a number of current challenges that need to be solved for filler metal-based joining methods. 相似文献
9.
This paper describes a unique device that has been developed for the transient loading of models along straight and curved boundaries and that operates by discharge of a high-energy, high-voltage capacitor bank. In its present configuration, this device can generate uniform pressures from 1500 psi (10 MPa) to pressures that approach 100,000 psi (690 MPa) and that rise from zero to maximum pressure in 2 μs and decay to approximately zero in another 2 μs. The transient stress-wave patterns in photoelastic models loaded with this device have been recorded by a dynamic polariscope. The dynamic polariscope presently in use is identical to a static polariscope except that the light source is of a short enough duration (½ μs) to photographically stop the movement of the photoelastic-fringe patterns caused by the stress wave. With the stress-wave generator and the dynamic polariscope, transient photoelastic patterns have been recorded in a number of models. These patterns indicate that the scatter from duplicate shots performed with this technique is on the order of 3 percent. This represents considerable improvement over the 15-percent scatter normally experienced with sheet-explosive loading techniques. This improvement and the rapid turnaround between shots (approximately 5 min) are distinct advantages this system has over other methods of dynamic loading. 相似文献
10.