介绍一个好的课程设置方案——《高等师范专科教育二年制物理专业学科课程设置方案》

国家教委师范司于1995年2月20日公布了高等师范专科教育二年制教学方案。该方案确定：二年的全部教育教学活动将包括六类课程，它们是：公共课程、学科课程、教育课程、特设课程、实践课程和活动课程。其中前四类课程总学时1600。学科课程占这四类课程总学     

On the Equivalence of Regularization Schemes

We illustrate via the sunset diagram that dimensional regularization “deforms“ the nonlocal contents of multi-loop disgrams with its equivalence to cutoff regularization scheme recovered only after sub-divergence was subtracted.Then we employed a differential equation approach for calculationg loop diagrams to verify that dimensional regularization deforms the low energy contents before subtraction.The virtues of the differential equation approach are argued especially in nonperturbative perspective.     

The criterion of the existence or inexistence of transverse shock wave at wedge supported oblique detonation wave

A simplified theoretic method and numerical simulations were carried out to investigate the characterization of propagation of transverse shock wave at wedge supported oblique detonation wave.After solution validation,a criterion which is associated with the ratio Φ (u 2 /u CJ) of existence or inexistence of the transverse shock wave at the region of the primary triple was deduced systematically by 38 cases.It is observed that for abrupt oblique shock wave (OSW)/oblique detonation wave (ODW) transition,a transverse shock wave is generated at the region of the primary triple when Φ < 1,however,such a transverse shock wave does not take place for the smooth OSW/ODW transition when Φ > 1.The parameter Φ can be expressed as the Mach number behind the ODW front for stable CJ detonation.When 0.9 < Φ < 1.0,the reflected shock wave can pass across the contact discontinuity and interact with transverse waves which are originating from the ODW front.When 0.8 < Φ < 0.9,the reflected shock wave can not pass across the contact discontinuity and only reflects at the contact discontinuity.The condition (0.8 < Φ < 0.9) agrees well with the ratio (D ave /D CJ) in the critical detonation.     

Periodic oscillation and fine structure of wedge-induced oblique detonation waves

An oblique detonation wave for a Mach 7 inlet flow over a long enough wedge of 30 turning angle is simulated numerically using Euler equation and one-step rection model.The fifth-order WENO scheme is adopted to capture the shock wave.The numerical results show that with the compression of the wedge wall the detonation wave front structure is divided into three sections:the ZND model-like strcuture,single-sided triple point structure and dual-headed triple point strucuture.The first structure is the smooth straight,and the second has the characteristic of the triple points propagating dowanstream only with the same velocity,while the dual-headed triple point structure is very complicated.The detonation waves facing upstream and downstream propagate with different velocities,in which the periodic collisions of the triple points cause the oscillation of the detonation wave front.This oscillation process has temporal and spatial periodicity.In addition,the triple point trace are recorded to obtain different cell structures in three sections.     

Preparation and Crystal Structures of Two Polymorphic Forms of Bupropion Hydrobromide

Two polymorphic forms (forms I and IV) of antidepressant bupropion hydrobro- mides were prepared and characterized by powder X-ray single-crystal diffractometer. Lots of commercial substances may consist of form I. Form I crystallizes in the triclinic system, space group P1 with Z = 2, a = 7.6943(8), b = 7.9347(9), c = 13.8558(15) , α = 85.971(3), β = 85.619(2), γ = 65.974(3)°, V = 769.66(14) 3, Dc = 1.384 g/cm3, formula C13H19ClNOBr, F(000) = 328, μ = 2.83 mm-1, the final R = 0.0579 and wR = 0.1282 for 1756 observed reflections with I > 2σ(I). Another polymorphic form, Ⅳ, belongs to the orthorhombic system, space group Pbca with a = 8.6365(3), b = 12.4167(4), c = 27.7299(9) , Z = 8, V = 2973.67(17) 3, Dc = 1.432 g/cm3, formula C13H19ClNOBr, F(000) = 1312, μ = 2.93 mm-1, the final R = 0.044 and wR = 0.1093 for 2018 observed reflections with I > 2σ(I). In the crystal structure of the two polymorphic forms, expected proton transfer from HBr to amino group of bupropion molecule occurs and intramolecular and intermolecular hydrogen bonds N–H···r are formed. These interactions result in hydrogen-bond dimers in these two forms. The bupropion molecule adopts different conformations in the two investigated solid state modifications.     

On Weakly Semicommutative Rings

A ring R is said to be weakly semicommutative if for any a,b∈R, ab=0 implies aRb（？）Nil（R）,where Nil（R） is the set of all nilpotent elements in R. In this note,we clarify the relationship between weakly semicommutative rings and NI-rings by proving that the notion of a weakly semicommutative ring is a proper generalization of NI-rings.We say that a ring R is weakly 2-primal if the set of nilpotent elements in R coincides with its Levitzki radical,and prove that if R is a weakly 2-primal ring which satisfiesα-condition for an endomorphismαof R（that is,ab=0（？）aα（b）=0 where a,b∈R） then the skew polynomial ring R[x;α] is a weakly 2-primal ring,and that if R is a ring and I is an ideal of R such that I and R/I are both weakly semicommutative then R is weakly semicommutative. Those extend the main results of Liang et al.2007（Taiwanese J.Math.,11（5）（2007）, 1359-1368） considerably.Moreover,several new results about weakly semicommutative rings and NI-rings are included.     

品读考题乐在其中——一道高考题研究过程的真实记录

翻阅2011年高考数学湖北卷理科试题,发现填空题第15题,试题表述简洁,题型设计新颖,图文并茂,背景浓厚,命题者给考生留下开阔的解题空间,不免引起了我们研究的兴趣.     

斜变法在HL-2A电子回旋加热功率沉积计算中的应用

介绍了用斜变法计算等离子体在辅助加热中能量沉积剖面的基本原理,并首次在HL-2A上利用斜变法处理在电子回旋波注入时刻电子的温度密度等参数数据,得出了电子回旋在轴加热和离轴加热的功率沉积剖面,验证了该方法的适用性.     

我国将建食品安全风险监测评估体系

在地沟油、洗虾粉和时下热议的"化学火锅底料"等一系列食品安全事件频出时,食品安全监管也成为众矢之的,对此,卫生部部长陈竺强调:"‘十二五’期间,将重点建设食品安全风险监测评估体系,解决食品安全风险监测评估能力