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排序方式: 共有51条查询结果,搜索用时 15 毫秒
11.
E. Aprile-Giboni J. Bystricky J. Deregel PH. Drompt C. Eisenegger J.M. Fontaine E. Heer R. Hess S. Jaccard F. Lehar W.R. Leo S. Mango S. Morenzoni Y. Onel F. Perrot D. Rapin J. Vrzal J. Yonnet 《Nuclear Physics A》1984,431(4):637-668
The main structure around m = 2.15 GeV first observed by the Argonne group in the spin-dependent total cross section ΔσL is confirmed in the energy range available at SIN. A simultaneous study of the scattered particles at small angles has been carried out with success and gave the spin-correlation parameter A00kk for the pp elastic scattering and for the reaction pp → π+d. The contribution of the 3-body reactions to this spin-dependent total cross section has been deduced and found to be lower than the contribution of the π+d reaction even at 583 MeV. 相似文献
12.
PH. Vergne 《高压研究》2013,33(1-3):451-454
Abstract Many works have been published on the pressure viscosity dependence of liquids. The difficulty to fit experimental results with a simple and universal law has been often put in evidence. According to our experimental results, we show that a power law is an acceptable alternative to the common Barus law. 相似文献
13.
The aim of the present paper is to study the semimartingale property of continuous time moving averages driven by Lévy processes. We provide necessary and sufficient conditions on the kernel for the moving average to be a semimartingale in the natural filtration of the Lévy process, and when this is the case we also provide a useful representation. Assuming that the driving Lévy process is of unbounded variation, we show that the moving average is a semimartingale if and only if the kernel is absolutely continuous with a density satisfying an integrability condition. 相似文献
14.
Andreas Basse 《Journal of Theoretical Probability》2009,22(4):811-826
The aim of the present paper is to characterize the spectral representation of Gaussian semimartingales. That is, we provide
necessary and sufficient conditions on the kernel K for X
t
=∫
K
t
(s) dN
s
to be a semimartingale. Here, N denotes an independently scattered Gaussian random measure on a general space S. We study the semimartingale property of X in three different filtrations. First, the ℱ
X
-semimartingale property is considered, and afterwards the ℱ
X,∞-semimartingale property is treated in the case where X is a moving average process and ℱ
t
X,∞=σ(X
s
:s∈(−∞,t]). Finally, we study a generalization of Gaussian Volterra processes. In particular, we provide necessary and sufficient
conditions on K for the Gaussian Volterra process ∫
−∞
t
K
t
(s) dW
s
to be an ℱ
W,∞-semimartingale (W denotes a Wiener process). Hereby we generalize a result of Knight (Foundations of the Prediction Process, 1992) to the nonstationary case. 相似文献
15.
16.
Dr. Eoghan G. Delany Satnam Kaur Prof. Steven Cummings Dr. Kristoffer Basse Dr. David J. D. Wilson Dr. Jason L. Dutton 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(20):5298-5302
Although ultimately not isolable for X-ray structural characterization, the free perfluorinated trityl cation was shown to be observable in neat triflic acid, which represents milder conditions than previous reports of this cation in “magic acid” or oleum. A triflate-bound species could be generated in organic solvents using stoichiometric amounts of triflic acid and was shown to be synthetically viable for hydride abstraction from Et3SiH. It was demonstrated that the para-position on the -C6F5 rings is the primary point of attack for decomposition of the cation. 相似文献
17.
This paper considers the solution of the geodetic Doppler multi-stationadjustment, i.e. the problem of computing the positions of severalstations observing the Doppler shift on radio frequencies emittedby several artificial satellites passing over the horizon. Amodification of an algorithm due to Golub and Plemmons, forsolving large linear least-squares problems where the observationmatrix has a block dual angular form, is proposed in this framework.This modification is shown to reduce substantially both datatransfer between the tracking stations and the main computingcentre, and the total computational effort required to obtainthe solution of the problem. Preliminary numerical results arediscussed and some further comments presented. 相似文献
18.
We prove the Kato conjecture for square roots of elliptic second order non-self-adjoint operators in divergence formL = -div(A∇) on strongly Lipschitz domains in ℝn, n≥2, subject to Dirichlet or to Neumann boundary conditions. The method relies on a transference procedure from the recent
positive result on ℝn in [2]. 相似文献
19.
20.
Strachan JD Bitter M Ramsey AT Zarnstorff MC Arunasalam V Bell MG Bretz NL Budny R Bush CE Davis SL Dylla HF Efthimion PC Fonck RJ Fredrickson E Furth HP Goldston RJ Grisham LR Grek B Hawryluk RJ Heidbrink WW Hendel HW Hill KW Hsuan H Jaehnig KP Jassby DL Jobes F Johnson DW Johnson LC Kaita R Kampershroer J Knize RJ Kozub T LeBlanc B Levinton F La Marche PH Manos DM Mansfield DK McGuire K McNeill DH Meade DM Medley SS Morris W Mueller D Nieschmidt EB Owens DK Park H Schivell J Schilling G 《Physical review letters》1987,58(10):1004-1007