超韧PE100管道专用料及其在多层管道中的应用

新一代超韧PE100聚乙烯管道材料与多层管道技术结合,可以为整个管网系统提供安全的施工,并使连接成本最小。     

中型前端机房设计指标的讨论

随着有线电视前端功能的增强，视频设备不断增加，前端视频系统的结构发生了变化，这些变化势必对系统和图像产生影响，因此在设计中全面反映这些影响才能保证信号质量。     

光谱法研究Er（Ⅲ）（HE）3与DNA的作用方式

以Tris—HCl缓冲溶液作为研究介质,在pH=6．75的环境下,应用电子吸收光谱和荧光光谱法探讨了苏木素（HE）和铒（Ⅲ）形成的配合物Er（Ⅲ）（HE）,与鲱鱼精DNA的作用方式,并用摩尔比法和双倒数法求得金属与配体的结合比为1：3,Er（Ⅲ）（HE）,配合物与鲱鱼精DNA的结合常数为F25℃=1．87×10^4L／mol。以吖啶橙（AO）作为分子探针探测了Er（Ⅲ）（HE）,配合物与DNA的作用情况,发现配合物能使AO-DNA体系发生动态荧光猝灭,Er（Ⅲ）（HE）,配合物与AO对鲱鱼精DNA具有嵌插竞争作用。     

T-DMB标准视音频编码容错技术研究

从视音频编码角度出发,对提高T-DMB系统视音频播放质量的一些客错技术进行了总结归纳.介绍了T-DMB标准视音频编码的基本原理,讨论了T-DMB系统固有的客错特性,对基于解码端客错工具的错误隐藏技术进行了总结.     

四唑虫酰胺及其代谢物BCS-CQ63359在番茄中的消解规律与储藏稳定性研究

摘要：目的 建立番茄中四唑虫酰胺及其代谢物BCS-CQ63359的QuEChERS-超高效液相色谱串联质谱(UPLC-MS/MS)方法,并进行四唑虫酰胺和BCS-CQ63359在番茄中的消解与储藏稳定性研究。方法 样品用乙腈涡旋提取,经N-丙基乙二胺（PSA）和无水硫酸镁（MgSO4）净化后,取上清液离心,过0.22m滤膜,采用BEH C18色谱柱分离,正电离模式下UPLC-MS/MS测定。 结果 在0.0002-0.05ug/mL的浓度范围内,四唑虫酰胺和BCS-CQ63359进样浓度与峰面积呈现良好的线性关系,相关系数均为0.9999,该方法的最低检出量（LOD）为0.0002ng,最低检出浓度为0.005mg/kg。在空白番茄样品中添加质量浓度为0.005 mg/kg、0.01 mg/kg和0.1 mg/kg的四唑虫酰胺和BCS-CQ63359,四唑虫酰胺和BCS-CQ63359的回收率为95%~112%,变异系数为2%-4%。田间试验结果表明,四唑虫酰胺在番茄中的降解半衰期为1.3-4.4d, 而-20℃条件下四唑虫酰胺和BCS-CQ63359储藏365天平均降解率为2.0%和-8.0%。结论 该方法的灵敏度、准确度和精密度符合农药残留分析要求。自然条件下,四唑虫酰胺在番茄中的降解很快。根据农药残留储藏稳定性试验准则,在储藏试验期间,降解率小于30%,表明储藏稳定,因此-20℃条件下,四唑虫酰胺和BCS-CQ63359在番茄中储藏365天是稳定的。     

Nonclassical steady-state detonation regimes in pressed TNETB

The reaction zones and the dependence of the velocity of steady-state detonation waves on the initial density of pressed TNETB are studied using a VISAR interferometer. It is shown that, in the range of initial densities of TNETB 1.56–1.77 g/cm³, the propagation of a steady-state detonation wave is possible without the range of elevated pressures (chemical spike) in the reaction zone predicted by the classical theory. The dependence of the detonation velocity on the initial density shows singularities which indicate that a steady-state underdriven regime can occur in this range of initial densities. Based on the well-known theoretical concepts of the hot-spot decomposition mechanism of heterogeneous explosives, it is shown that the possibility of the existence of a steady-state detonation wave without a chemical spike, in particular, underdriven detonation, and the effect of the internal structure of the charge on the detonation regime are explained by the decomposition of explosives at the shock-wave front. __________ Translated from Fizika Goreniya i Vzryva, Vol. 43, No. 6, pp. 97–103, November–December, 2007.     

基于学生主体的就业导向办学探索

“基于学生主体的就业导向办学模式”视教育为服务,视学生为顾客,始终体现学生作为消费者的主体选择性和动态调整性,并通过学生的主体选择性和动态调整性而达到人才培养与人才需求柔性动态相适应。实践表明“基于学生主体的就业导向办学模式”符合社会主义市场经济发展的规律,是使高校人才培养与社会需求相适应的一种较好的形式,具有强大的生命力。     

Stress corrosion cracking behavior of Al−Cu−Li−Mg−Zr(−Ag) alloys

The effect of aging on the stress corrosion cracking (SCC) behavior of Al−Cu−Li−Mg−Zr(−Ag) alloys such as Weldalite 049 and AA 8090 was studied by the constant elongation test method to investigate their SCC mechanism. The SCC resistance was not very sensitive under the strain rate of 2×10⁻⁵/sec, whereas it was significantly decreased under the strain rate of 5×10⁻⁶/sec. The SCC preferentially occurred in the intergranular crack mode. The relatively poor SCC resistance of Weldalite 049 in the under-aged condition was improved by aging. Considering the microstructural development during aging, it is related to the dissolution of the precipitation free zone as an anodic area and the strengthening by the coarsening of precipitation.     

利用上位机与PLC之间的串行通信实现现场数据的采集

本文介绍Visual Basic6.0与OMRON-C200HE之间的通信规约、相应的硬件设计，并如何利用两者结合进行现场数据的采集。     

Chemical,Structural, and Electronic Aspects of Formation and Degradation Behavior on Different Length Scales of Ni‐Rich NCM and Li‐Rich HE‐NCM Cathode Materials in Li‐Ion Batteries

In order to satisfy the energy demands of the electromobility market, both Ni‐rich and Li‐rich layered oxides of NCM type are receiving much attention as high‐energy‐density cathode materials for application in Li‐ion batteries. However, due to different stability issues, their longevity is limited. During formation and continuous cycling, especially the electronic and crystal structure suffers from various changes, eventually leading to fatigue and mechanical degradation. In recent years, comprehensive battery research has been conducted at Karlsruhe Institute of Technology, mainly aiming at better understanding the primary degradation processes occurring in these layered transition metal oxides. The characteristic process of formation and mechanisms of fatigue are fundamentally characterized and the effect of chemical composition on cell chemistry, electrochemistry, and cycling stability is addressed on different length scales by use of state‐of‐the‐art analytical techniques, ranging from “standard” characterization tools to combinations of advanced in situ and operando methods. Here, the results are presented and discussed within a broader scientific context.