排序方式: 共有19条查询结果,搜索用时 109 毫秒
11.
G.C. Salzman J.C. Martin J.J. Jarmer J.E. Simmons Gerald G. Ohlsen T.R. Donoghue 《Physics letters. [Part B]》1973,45(2):123-126
We have measured the longitudinal neutron polarization in the reaction, at θ=0°, for an incident longitudinally polarized deuteron beam. A deuteron energy range of 3.3–14.9 MeV was covered. The polarization transfer from the deuteron to the neutron is found to be large, and the reaction is potentially useful as a source of polarized neutrons. 相似文献
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13.
W.R. Salzman 《Chemical physics letters》1974,25(2):302-304
A closed-form exact solution is presented for the time evolution operator of a nonrelativistic hydrogen atom driven by a circularly polarized monochromatic light beam. The solution has the form U(t, 0) = exp(?itF)exp(?itG), where F and G are time independent operators. All temporal effects of the oscillating field are included. Extension to other systems is easily made. A generalization of the rotating wave approximation to multilevel systems is also presented. 相似文献
14.
Jagtap PG Baloglu E Southan G Williams W Roy A Nivorozhkin A Landrau N Desisto K Salzman AL Szabó C 《Organic letters》2005,7(9):1753-1756
[reaction: see text] The synthesis of 6,11-dihydro-5H-indeno[1,2-c]isoquinolin-5-ones from the base-promoted condensation reaction of homophthalic anhydride and 2-(bromomethyl)-benzonitrile and a convenient method for the synthesis of indolo[3,2-c]isoquinolinones are described. 相似文献
15.
We developed a novel, simple procedure for achieving lateral confined epitaxy (LCE). This procedure enables the growth of uncracked GaN layers on a Si substrate, using a single, continuous metalorganic chemical vapor deposition (MOCVD) run. The epitaxial growth of GaN is confined to mesas, defined by etching into the Si substrate prior to the growth. The LCE-GaN layers exhibit improved morphological and optical properties compared to the plain GaN-on-Si layers grown in the same MOCVD system. By performing a set of LCE growth runs on mesas of varying lateral dimensions, we specified the crack-free range of GaN on Si as 14.0±0.3 μm. 相似文献
16.
A mathematical model is proposed for the process of vacuum superplasticforming. The model exploits the fact that in most industrialapplications the sheet aspect ratio (thickness/sheet width)is small. After an initial consideration of some of the moregeneral properties and the literature of superplastic materials,the elastic/plastic deformation of an internally-inflated thin-walledcylinder is examined. Plates of arbitrary geometry are thenconsidered. A quasisteady model in which the sheet moves througha sequence of steady states is developed. Some simplified closed-formsolutions are examined, but for general cases a system of nonlinearpartial differential equations must be solved numerically. Anefficient and accurate semi-explicit numerical scheme is proposedand a simplified stability analysis is presented; the methodis then used to compute properties of superplastic vacuum mouldedsheets in a number of practically motivated cases. 相似文献
17.
W.R. Salzman 《Chemical physics》1976,15(3):421-429
A previously derived closed form solution to the problem of an atom interacting with an externally supplied classical circularly-polarized electromagnetic field is extended to the case of a freely rotating molecule. It is shown how the conventional Rosenfeld expression for the optical rotation parameter may be derived from the present formalism. 相似文献
18.
S K Salzman M S Sellers A L Beckman R Naidu G D Macewen 《Journal of chromatography. A》1985,343(2):285-301
Liquid chromatography with electrochemical detection was used for the determination of norepinephrine and epinephrine in human plasma samples obtained prior to, after, and six times during the course of spinal fusion surgery for the correction of scoliosis. The catecholamines were extracted from plasma by alumina adsorption and chromatographed isocratically using a reversed-phase, ion-pairing system. Data obtained are compared to those obtained intraoperatively by other authors using a radioenzymatic method, and the mechanism of sympathetic activation during surgery is discussed. Preliminary data using 3-micron particle size columns and dual-parallel electrochemical detection are presented. 相似文献
19.
We propose to engineer the atomic band structure in optical lattices in order to design a Fabry-Perot interferometer with large mode spacing and strong nonlinear coupling to be employed in atom optics. The use of an optical lattice allows for a significant reduction of the atomic effective mass, while the slow modulation of its parameters spatially confines the matter waves on a length scale of a few dozen optical wavelengths. As a consequence, the mode spacing in such a cavity would be as high as one-tenth of the recoil energy, allowing for a very efficient filter action, while the nonlinear coupling due to interatomic interactions could lead to bistability and limiting effects in the transmission of the atomic beam. 相似文献