为什么把perturbation翻译为"摄动"?

英文科学名词perturbation在不同学科中有不同的定名.在原子物理叫"微扰",在天文学、数学、力学里称为"扰动",更多场合用"摄动".     

A Position-Dependent Two-Atom Entanglement in Real-Time Cavity QED System

We study a special two-atom entanglement case in assumed cavity QED experiment in which only one atom effectively exchanges a single photon with a cavity mode. We compute two-atom entanglement under position-dependent atomic resonant dipole-dipole interaction （RDDI） for large interatomic separation limit. We show that the RDDI, even t, hat which is much smaller than the maximal atomic Rabi frequency, can induce distinct diatom entanglement. The peak entanglement reaches a maximum when RDDI strength can compare with the Rabi frequency of an atom.     

Interplay Between Quark-Antiquark and Diquark Condensates in Vacuum in a Two-Flavor Nambu-Jona-Lasinio Model

By means of a relativistic effective potential, we analytically research competition between the quark- antiquark condensates （qq） and the diquark condensates （qq） in vacuum in ground state of a two-flavor Nambu Jona Lasinio （NJL） model and obtain the Gs-Hs phase diagram, where Gs and Hs are the respective four-fermion coupling constants in scalar quark-antiquark channel and scalar color anti-triplet diquark channel. The results show that, in the chiral limit, there is only the pure （qq） phase when Gs/Hs 〉 2/3, and as Gs/Hs decreases to 2/3 〉 Gs/Hs ≥ 0 one will first have a coexistence phase of the condensates （qq） and （qq） and then a pure （qq） phase. In non-zero bare quark mass case, the critical value of Gs/Hs at which the pure （qq） phase will transfer to the coexistence phase of the condensates （qq） and （qq） will be less than 2/3. Our theoretical results, combined with present phenomenological fact that there is no diquark condensates in the vacuum of QCD, will also impose a real restriction to any given two-flavor NJL model which is intended to simulate QCD, i.e. in such model the resulting sma/lest ratio Gs/Hs after the Fierz transformations in the Hartree approximation must be larger than 2/3. A few phenomenological QCD-like NJL models are checked and analyzed.     

Antikaon Condensation and In-medium Kaon and Antikaon Production in Protoneutron Stars

Antikaon condensation and kaon and antikaon production in protoneutron stars are investigated in a chiral hadronic model （also referred to as the FST model in this paper）. The effects of neutrino trapping on protoneutron stars are analyzed systematically. It is shown that neutrino trapping makes the critical density of K^- condensation delay to higher density and fifo condensation not occur. The equation of state （EOS） of （proto）neutron star matter with neutrino trapping is stiffer than that without neutrino trapping. As a result, the maximum masses of （proto）neutron stars with neutrino trapping are larger than those without neutrino trapping. If hyperons are taken into account, antikaon does not form a condensate in （proto）neutron stars. Meanwhile, the corresponding EOS becomes much softer, and the maximum masses of （proto）neutron stars are smaller than those without hyprons. Finally, our results illustrate that the Q values for K^＋ and K^- production in （proto）neutron stars are not sensitive to neutrino trapping and inclusion of hyperons.     

Positions and Widths of Anticrossings for Potassium Rydberg Stark States

The B-spline expansion technique is applied to study the anticrossings for potassium Rydberg states in a static electric field. The results of our calculation indicate that the antierossings are caused mainly by the core interaction or by the fine structure interaction. Our results for the positions and the widths of the anticrossings are in good agreement with experimental data.     

导出的纯语言OWGA算子及其在的群决策中的应用

研究属性权重、专家权重和属性值均为纯语言变量的多属性群决策问题,利用纯语言变量的运算规律,提出一种新的数据信息集成算子:导出的纯语言有序加权几何平均(IPLOWGA)算子。并且给出纯语言环境下基于IPLOWGA算子和PLOWGA算子的一种群决策方法。最后,进行实例分析,说明该方法的实用性和有效性。     

基于MATLAB的能级、波函数及几率密度图形的绘制

本文着重介绍运用Mafia5编程语言完成一维无限深势阱和线性谐振子的能级、渡函数及几率密度图形的绘制问题。     

中文化学名词醇醛酮醚酯之由来

1932年民国教育部颁布的《化学命名原则》为中文化学名词确立了统一的标准,并对于"元素及化合物定名取字"提出"取字应以谐声为主,会意次之,不重象形"的定名总则.它确立的中文化学名词醇、醛、酮、醚、酯是意译名,这似乎与其音译为主的命名原则相悖.本文讨论了醇、醛、酮、醚、酯的各种历史译名,并分析了它们被《原则》采纳的原因.     

基于改进可能度和距离测度的概率语言多属性群决策方法研究

概率语言术语集(PLTSs)是一个表达决策者对各个方案的偏好及选择的强有力工具.针对概率语言术语集距离计算方法上存在的缺陷,利用转换函数重新定义了概率语言集的距离测度.并提出了一种改进概率语言可能度的计算方法.并在此基础上,计算出群决策矩阵最大可能度并对其加权平方,由此构造一个多目标函数来求得未知的属性权重,再结合TOPSIS与ELECTRE得到各方案的综合评估信息.通过实例分析和对比分析,证明方法的有效性和可行性.     

“新医科”背景下医用物理学课程改革与建设

在"新医科"建设的时代背景下,针对医理、医工学科深度交叉融合的新要求,传统的医用物理学教学存在不足,面临挑战.文章分析了当前医用物理学教学的不足之处,并针对这些不足,提出与新医科建设相适应的医用物理课程教学改革思路与措施.