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排序方式: 共有86条查询结果,搜索用时 15 毫秒
61.
Robert T. Sataloff Rakesh Chandra Edward W. Fisher David Goldenberg Ehab Y. Hanna Jonas Johnson David W. Kennedy Dennis H. Kraus John H. Krouse Michael Link Lawrence R. Lustig Bert W. O'Malley Jay F. Piccirillo Robert Ruben Sandra Schwartz Samuel H. Selesnick Raj Sindwani Richard J. Smith D. Bradley Welling 《Journal of voice》2021,35(2):170-171
62.
Asadchikov V. E. Bedin S. A. Vasiliev A. B. Dyachkova I. G. Goldenberg B. G. Nazmov V. P. Andreev A. V. Konovko A. A. Reshetov S. A. 《Crystallography Reports》2021,66(3):514-519
Crystallography Reports - The methodology for obtaining regular metal microstructures, forming a two-dimensional periodic lattice, has been considered with the aim of designing new IR-range... 相似文献
63.
In this paper, we establish several inequalities for some differantiable mappings that are connected with the Riemann-Liouville fractional integrals. The analysis used in the proofs is fairly elementar... 相似文献
64.
65.
In this paper the singularly perturbed initial boundary value problems for the nonlocal reaction diffusion system are considered. Unsing the iteration method and the comparison theorem, the existence, uniqueness and its asymptotic behavior of solution for the problem are studied. 相似文献
66.
Chemischen Fabrik vorm. Goldenberg Geromont & Cie. Wiesbaden 《Fresenius' Journal of Analytical Chemistry》1923,63(3-4):111-117
Ohne Zusammenfassung 相似文献
67.
A. L. Goldenberg M. Yu. Glyavin N. A. Zavolsky V. N. Manuilov 《Radiophysics and Quantum Electronics》2005,48(10-11):741-747
We consider the design of a gyrotron with an operating frequency of 24 GHz and an accelerating voltage of about 5 kV and describe a nonadiabatic electron gun forming an electron beam with a pitch factor of 1.8 and a velocity spread of about 10%. Longitudinal distribution of high-frequency field in a cavity with a step is optimized by choosing the step height and length. The design value of the gyrotron output efficiency is 35% at the second gyrofrequency harmonic. 相似文献
68.
We have investigated the superconducting properties of the Bi1.7 Pb0.3Sr2Ca2−xCe
x
Cu3O10+δ system with x=0.00, 0.02, 0.04, 0.08 and 0.1 by X-ray diffraction and magnetic susceptibility. The substitution of Ce for Ca has been found
to drastically change the superconducting properties of the system. X-ray diffraction studies on these compounds indicate
decrease in the c-parameter with increased substitution of Ce at Ca site and volume fraction of high T
c (2 : 2 : 2 : 3) phase decreases and low T
c phase increases. The magnetic susceptibility of this compound shows that the diamagnetic on set superconducting transition
temperature (onset) varies from 109 K to 51 K for x=0.00, 0.02, 0.04, 0.08 and 0.1. These results suggest the possible existence of Ce in a tetravalent state rather than a trivalent
state in this system; that is, Ca2+ → Ce4+ replacement changes the hole carrier concentration. Hole filling is the cause of lowering T
c of the system. 相似文献
69.
Ohne Zusammenfassung 相似文献
70.