25MeV/u 40)Ar+197Au反应中轻粒子的在平面和出平面发射

利用两裂片符合下的轻粒子测量,研究了25MeV/u ⁴⁰Ar+¹⁹⁷Au反应中轻粒子的在平面和出平面发射.对于中速p,d,t,α粒子,观测到粒子在平面发射几率增大,这表明该反应中存在旋转效应.该现象随着粒子质量增大和碰撞参数增大而变得更加明显.同时也观测到类弹粒子主要为在平面发射.     

An axiomatic characterization of the Hirsch-index

The Hirsch-index is a well-known index for measuring and comparing the output of scientific researchers. The main contribution of this article is an axiomatic characterization of the Hirsch-index in terms of three natural axioms. Furthermore, two other scientific impact indices (called the w-index and the maximum-index) are defined and characterized in terms of similar axioms.     

超低比转速高速诱导轮离心泵的不稳定控制与试验研究

分析了超低比转速高速诱导轮高心泵容易产生不稳定特性的原因和机理，并提出了控制措施，试验表明采用合理设计复合叶轮等过流部件以及在诱导轮和离心轮前加孔板能够使高速泵获得稳定的扬程流量特性线．     

‘Numerical Linear Algebra with Applications’ impact factor for 2008 has been published to be 0.822

The Journal ‘Numerical Linear Algebra with Applications’ has received its 2008 impact factor. The impact factor for 2008 has been published to be 0.822, an increase from 0.696 in 2007. Copyright © 2009 John Wiley & Sons, Ltd.     

雷电回击参数对回击电磁场计算的影响研究

 基于BG，TL，MTLL，MTLE和TCS 5种模型，研究了雷电回击通道高度、回击速度和大地电容率对雷电回击电磁场的影响。计算中5种模型采用相同的通道基电流波形，通过计算总结了几种参数对回击电磁场的影响。     

ECONOMIC IMPACTS OF GLOBAL WARMING: THE CASE OF THE BARENTS SEA FISHERIES

ABSTRACT. . Regional analyses of possible physical and biological effects of global warming in the Barents Sea area have been carried out recently. Based on such studies possible economic impacts of global warming on the Barents Sea fisheries have been quantified, assuming different types of management regimes. The EconSimp2000 model, consisting of the ecosystem model AggMult and the fleet model EconMult have been parameterized based on fleet and catch records from the Norwegian Barents Sea fisheries. The model has been used to study biological and economic impacts of different environmental scenarios representing possible consequences of global warming. The current environmental situation, including normal seasonal and other variations, has been used as a reference scenario. Several biological and economic indicators have been defined in order to evaluate the simulation results of different environmental scenarios and different types of management regimes. The findings support earlier studies where biological and economic impacts of changes in management regime is found to be more pronounced than impacts caused by effects of global warming.     

On the Consistency between the Assumption of a Special System of Reference and Special Relativity

In a previous work, we have shown that the null result of the Michelson–Morley experiment in vacuum is deeply connected with the notion of time. The same is true for the postulate of constancy of the two-way speed of light in vacuum in all frames independently of the state of motion of the emitting body. The argumentation formerly given is very general and has to be true not only within Special Relativity and its “equivalence” of all inertial frames, but as well as in Lorentz-Poincaré scenario of a preferred reference frame. This paper is the second of a trilogy intending to revisit the foundations of Special Relativity, and addresses the question of the constancy of the one-way speed of light and of the differences and similarities between both scenarios. Although they manifestly differ in philosophy, it is debated why and how the assumption of a “special system of reference experimentally inaccessible” is indeed compatible with Einstein’s Special Relativity, as beautifully outlined and discussed by Bell [Speakable and Unspeakable in Quantum Mechanics (Cambridge University Press, Cambridge, 1988)]. This rather trivial statement is still astonishing nowadays to a big majority of scientists. The purpose of this work is to bring such assertion into perspective, widening the somewhat narrow view of Special Relativity often presented in textbooks and scientific papers.     

Electron impact excitation cross sections for phosphorus

An analytic atomic independent-particle-model is used to generate wave functions for the valence and excited states of the neutral phosphorus atom. These wave functions are used to calculate generalized oscillator strengths, and from these quantities the cross sections are obtained in Born approximation. Various excitations from the ground state are considered, and results are presented for electron impact energies up to 5 keV. Received: 6 May 1997 / Revised: 21 October 1997 / Accepted: 5 December 1997     

DYNAMIC ANALYSIS OF LARGE DEFORMATION OF RIGID-VISCOPLASTIC HARDENING SPHERICAL SHELLS IMPACTED BY A MISSILE

This paper studies the dynamic behavior of large deformation of sphericalshells impacted by a flat-nosed missile.By using isometric transformations,thedeformation modes are given.On the basis of Perzyna-Symonds viscoplasticconstitutive equations,the motion equations of the shells are obtained by rigid-viscoplastic variational principle.A comparison made between the numerical resultsand experimental ones indicates that the two groups of results are in conformity witheach other.