电缆气压保气率计算机统计系统

介绍了电缆气压保气率计算机统计系统开发的目的和意义，系统程序的流程和结构，以及系统程序的编制和应用。     

The radiation crosslinking and scission of ethylene-propylene copolymers studied by solid-state nuclear magnetic resonance

Methyl groups from chain scission and H-crosslinks have been identified by solid-state nuclear magnetic resonance in amorphous ethylene-propylene copolymers containing 23 and 36 mole % propylene after γ-irradiation to 10 MGy at 30°C. G (scission) and G (crosslink) values determined from the n.m.r. spectra and by extraction are in agreement, which suggests that the crosslinks are not clustered. This may differ from the situation in polyethylene where there is a substantial crystalline content. G(S). G(X) and the ratio G(S)/G(X) increase with increasing propylene content of the copolymers.     

关于构建长庆油田生产建设和谐安全监管的思考

通过对长庆油田生产建设和谐安全监管意义的思考,分析当前在生产建设中存在的不和谐因素,指出构建和谐安全监管的切入点,进而提出构建长庆油田生产建设和谐安全监管的建议。     

铝电解槽热平衡测试计算中的几点问题

由于缺乏正规的标准，铝电解槽能量平衡测试中存在着一些概念混淆、计算方法和公式错误的情况，应引起测试工作者的注意，在测试计算前应认真制订方案，多查一些参考资料，核实所用公式、数据，避免发生失误。同时对于类似计算，由于计算机的应用，应尽可能采取精确算法。没必要采取一些非常粗糙的近似算法和经验值。     

3G网络基站电磁环境影响分析

通过资料收集、理论预测、数据监测与分析,讨论了辽宁某市3G网络基站中典型基站的电磁环境。结果表明,理论预测与实际监测结果差距不大,各典型基站的电磁辐射功率密度均低于国家标准限值8μW/cm2,对该地区的电磁环境影响不大。对保护环境提出了相应的对策措施.     

论地方人大对司法机关的监督

地方人大对司法机关的监督,具有国家性、抽象性的特点.目前我国地方人大对司法机关的监督存在不知监督、不能监督、不当监督、不善监督的问题.完善我国地方人大对司法机关的监督,应当遵循“避实就虚”原则、“集体监督”原则、“国家性”与“地方性”兼顾的原则.要提高地方人大的监督效果,应当建立和完善问题发现措施、主题甄别措施、方案确定措施、落实检查措施.要全面发挥地方人大的监督作用,要提倡“预防性”监督.     

高校内部控制存在的问题及对策

从内部控制的内部环境、风险评估、控制活动、信息与沟通、内部监督等五要素分析高校内部控制中存在的问题.针对问题提出了相应的对策,即加强内部环境的建设、构建科学的风险评估机制、强化内部控制活动、建立科学的信息与沟通系统、设立有效的内部监督制度.     

铁尾矿为原料微波法制备介孔分子筛

以鞍山铁尾矿为硅源,CTAB为模板剂,采用微波辐照法合成出全硅介孔分子筛MCM-41。用N2低温吸附、FT-IR、XRD和TEM等表征手段考察了其比表面积、孔径分布、晶体形貌等特性。结果表明:微波辐射法合成的MCM-41分子筛诱导期极短,晶化速度很快,具有典型的按六方对称性排列的孔道结构,FT-IR证明了分子筛具有硅氧四面体骨架。     

Recombination luminescence from defects in boron-ion implantation-doped diamond using low fluences

 Two identical, high purity, natural type IIa diamonds, which displayed the ubiquitous blue cathodoluminescence (CL) band at ≈ 2.9 eV, as well as an indication of the corresponding green band at ≈ 2.4 eV, have been equivalently doped by using extremely low dose B⁺- and C⁺-ion CIRA-implantations respectively. Comparative CL measurements showed changes in the intensities of the 2.9 and 2.4 eV bands and the generation of bands at ≈ 4 eV, as well as at ≈ 3.5 and ≈ 4.6 eV (the latter two in the B⁺-CIRA diamond). The results are commensurate with the model (proposed previously) in which the 2.9 and 4 eV bands are generated respectively by electron-hole recombinations at negatively charged acceptor- and positively charged donor-like, intrinsic defects. The present results indicate that Coulomb interactions between the latter defects and (at least partially) compensated, negatively charged, boron acceptors, generate the 3.5 and 4.6 eV bands, which may be considered as higher energy (≈ 0.6 eV) replicas of the 2.9 and 4 eV bands. In both cases, two electrons and a hole interact just before the hole combines with an electron. Such a configuration of charges seems related to, and could possibly be described as, a type of ”ionised exciton molecule”, where the ”bonding” of two negative ”nuclei” is facilitated by the presence of the hole. The CL measurements further indicate that the 2.4 eV band forms when a high enough density of, in this case, neutral acceptors are present. These neutral acceptors compete with the valence band to supply holes for recombination at the negatively charged, acceptor-type, intrinsic defects which are, in the absence of the boron, responsible for the generation of the blue, 2.9 eV band. Received: 5 December 1997 / Accepted: 13 December 1997