p-亚正规算子的性质

研究p-亚正规算子A∈B(FB)的不变子空间约化A的充分条件，并证明了p-亚正规算子也具有Fuglede-Putnam性质，     

群为完全群的一个充要条件

一个群为完全群，而当它是另一个群的正规子群时，则必为其直因子，反之成立否，马元达（1982）对有限群的情况进行了证明，该文推广到一般群。     

基于子波变换的消噪方法在涡街流量传感器中的应用

基于子波变换消噪原理，结合流量测量持定要求，提出了一种适用于在涡街流量传感器信号处理的单支重构滤波方法，同时给出了滤波级数的选取方法，这种计数方法能够有效地扩大涡街流量传感器的量程下降，通过对实际信号的分析，证实了方法的有效性。     

电偶极近似条件下电磁相互作用的Feynman路径积分描述

本文讨论了电偶极近似条件下的电磁相互作用。采用相空间中的Feynman路径积分，利用正则变换，计算出变质量变频率谐振子与电磁场相互作用时的传播子以及常质量常频率谐振子与电磁场相互作用时的波函数。同时也表明了传播子的形式与规范选择有关。     

硅酸盐中Si—O~(br)键与Si—O~(ter)键相对强度的量子化学研究(英文)

用ab-initio法对硅氧烷及硅酸分子的研究指出,在硅酸盐中,由于电子的局域性,体系的总能量可以向结构单元或双中心分割:从而可以得到Si-O~(br)比Si-O~(ter)更稳定。用这些结果可以解释硅酸盐的许多性质。     

教育学课程理论转化为实践的策略

教育学是师范学生必修的一门课程，该课程的教学是使学生顺利走上工作岗位的前提和保证。要达到这一目的，必须改变教学策略，特别要对教学内容进行重组，使教学的主体向学生转化，引导学生把教育学课程理论转变成教学实践能力，使学生听懂、能用。     

浅谈七年级生物教学中的理化知识分布与处理

分析初一生物教材(苏教版)中的理化知识分布特点,目的在于运用恰当的处理方法,使生物教学做到“对症下药”,提高教学效果。     

Inorganic chemical composition and source signature of PM2.5 in Beijing during ACE-Asia period

Aerosol samples for PM2.5 were collected in Beijing for 38 consecutive days from March to April 2001 using an IMPROVE Sampler. Concentrations of 20 elements in PM2.5 were determined using a PIXE method. Results show that the average mineral dust concentration of PM2.5 was 14.6 Ilg/m3 during the observation period. On the sand-dust event days of March 21 and April 10, dust PM2.5 mass concentrations were 62.4 and 54.1 μg/m^3, respectively.These demonstrate that fine particle pollution by dust event in Beijing was very severe. The enrichment factors of S and Cu reached minimums on the dusty days and were high on the non-dusty days. It is considered that enrichment factors of elements in PM2.5, which are associated with human activities, can probably provide an effective method to distinguish local sources from external sources of dust. Factor analysis on the chemical composition in PM2.5 shows that sources of crustal matters, anthropogenic emission, and oil combustion contributed to PM2.5 levels in air in the springtime of 2001 in Beijing.     

Structural and Chemical Diversity of TI-Based Cuprate Superconductors

The first TI一based euprate supereonduetor,TI一Ba-Cu一(),was diseovered by 2.2.Sheng and A.M.Hermann仁1〕. TI beeomes supereondueting at 2.38 K.NumerousTI eompounds and alloys are supereondueting.TIMo6Ses has the highest transition temperature of1 2.2 K among all non一euprate Tl eontaining alloyand eompound supereonduetors.Before thediseovery of the euprate supereonduetors,some TIeontaining oxide supereonduetors were found,among whieh TI。.3W()3 has the highest transitiontemPerature,2.14 K. Sinee the diseovery of TI euPratesuPereonduetors,two distinet families have beenidentified.Soon after the diseovery of TI一Ba一Cu-(),supereonduetivity was eonfirmed in TI一Ba一Ca-Cu一()samples.The ehemieal eompositions anderystal struetures of those eompounds were workedout as T12BaZCu()6,T12BaZCaCuZ()。,andT12BaZCaZCu3OI。[2〕.This 15 the first family of TIeuPrate supereonduetors,whieh features two TIatoms in eaeh ehemieal formula.     

H6M4(N2H2)3(M=Al,Ga)簇合物的结构、红外光谱和热力学性质研究

采用自洽场方法(HF)和密度泛函(DFT)的B3LYP方法，在6-31G^*水平下，研究了H6M4(N2H2)3(a—M＝Al，b—M＝Ga)簇合物的几何构型、电子结构、红外光谱及热力学性质．结果表明：N—N键比肼中N—N键长，有进一步裂解的趋势．振动频率计算表明：铝、镓的肼簇合物为基态稳定结构．