排序方式: 共有12条查询结果,搜索用时 15 毫秒
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G. Igo G.S. Adams T.S. Bauer G. Pauletta C.A. Whitten A. Wreikat G.W. Hoffmann G.S. Blanpied W.R. Coker C. Harvey R.P. Liljestrand L. Ray J.E. Spencer H.A. Thiessen C. Glashausser N.M. Hintz M.A. Oothoudt H. Nann M. Gazzaly 《Physics letters. [Part B]》1979,81(2):151-155
Differential cross sections and analyzing powers for the elastic scattering of 800 MeV polarized protons from 40,42,44,48Ca are reported. A first-order, spin-dependent KMT optical potential analysis is presented from which the rms radii of the neutron densities are deduced. A comparison of these results with other determinations and with various theoretical predictions is given. 相似文献
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NL Asfandiarov AI Fokin VG Lukin EP Nafikova GS Lomakin VS Fal'ko YV Chizhov 《Rapid communications in mass spectrometry : RCM》1999,13(12):1116-1123
A series of anthraquinone (C(14)O(2)H(8)) derivatives has been studied by means of electron capture negative ion mass spectrometry (ECNI-MS), photoelectron spectroscopy (PES), and AM1 quantum chemical calculations. Mean lifetimes of molecular negative ions M(-.) (MNI) have been measured. The mechanism of long-lived MNI formation in the epithermal energy region of incident electrons has been investigated. A simple model of a molecule (a spherical potential well with the repulsive centrifugal term) has been applied for the analysis of the energy dependence of cross sections at the first stage of the electron capture process. It has been shown that a temporary resonance of MNI at the energy approximately 0.5 eV corresponds to a shape resonance with lifetime 1-2.10(-13) s in the f-partial wave (l = 3) of the incident electron. The next resonant state of MNI at the energy approximately 1.7 eV has been associated with the electron excited Feshbach resonance (whose parent state is a triplet npi* transition). In all cases the initial electron state of the MNI relaxes into the ground state by means of a radiationless transition, and the final state of the MNI is a nuclear excited resonance with a lifetime measurable on the mass spectrometry timescale. Copyright 1999 John Wiley & Sons, Ltd. 相似文献
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A finite element formulation for global linear stability analysis of a nominally two‐dimensional base flow 下载免费PDF全文
A stabilized finite element method, to carry out the linear stability analysis of a two‐dimensional base flow to three‐dimensional perturbations that are periodic along span, is presented. The resulting equations for the time evolution of the disturbance requires a solution to the generalized eigenvalue problem. The analysis is global in nature and is also applicable to non‐parallel flows. Equal‐order‐interpolation functions for velocity and pressure are utilized. Stabilization terms are added to the Galerkin formulation to admit the use of equal‐order‐interpolation functions and to eliminate node‐to‐node oscillations that might arise in advection‐dominated flows. The proposed formulation is tested on two flow problems. First, the mode transitions in the circular Couette flow are investigated. Two scenarios are considered. In the first one, the outer cylinder is at rest, while the inner one spins. Two linearly unstable modes are identified. The primary mode is real and represents the axisymmetric Taylor vortices. The second mode is complex and consists of spiral vortices. For the counter‐rotating cylinders, the primary transition is via the appearance of spiral vortices. Excellent agreement with results from earlier studies is observed. The formulation is also utilized to investigate the parallel and oblique modes of vortex shedding past a cylinder for the Re = 100 flow. It is found that the flow is associated with a large number of unstable oblique shedding modes. The parallel mode of vortex shedding is a special case of this family of modes and is associated with the largest growth rate. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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Montanet L Gieselmann K Technical Associate Barnett RM Groom DE Trippe TG Wohl CG Armstrong B Technical Associate Wagman GS Technical Associate Murayama H Stone J Hernandez JJ Porter FC Morrison RJ Manohar A Aguilar-Benitez M Caso C Lantero P Technical Associate Crawford RL Roos M Törnqvist NA Hayes KG Höhler G Kawabata S Manley DM Olive K Shrock RE Eidelman S Schindler RH Gurtu A Hikasa K Conforto G Workman RL Grab C 《Physical review D: Particles and fields》1994,50(3):1173-1826
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G.W. Hoffmann G.S. Blanpied W.R. Coker R.P. Liljestrand L. Ray J.E. Spencer H.A. Thiessen N.M. Hintz M.A. Oothoudt T.S. Bauer G. Igo G. Pauletta J. Soukup C.A. Whitten H. Nann K.K. Seth C. Glashausser D.K. McDaniels P. Varghese 《Physics letters. [Part B]》1978,76(4):383-387
Differential cross section and analyzing power data for elastic scattering of 0.8 GeV polarized protons from 116Sn and 124Sn are analyzed in terms of a spin-dependent Kerman-McManus-Thaler formalism. Neutron matter densities and rms radii are deduced with careful attention to sources of error, and found to be in good agreement with Hartree-Fock predictions. 相似文献