丰镇发电厂6号机组励磁调节器改造

丰镇发电厂6号机组原励磁调节器由于技术相对落后,长期运行不稳定。为了保证励磁调节器的运行稳定性,采用HWJT08D励磁调节器进行了改造,并分析了由此励磁调节器与工控机构成的监控系统的优、缺点。     

住宅蓄冰中央空调的开发与运行

介绍了上海首家住宅小区应用冰蓄冷中央空调的开发与运行经验。分析了冰蓄冷系统的节能意义和住宅小区应用冰蓄冷的适用性。指出开发应用冰蓄冷系统应着重解决的关键问题。     

平稳随机激励下随机参数齿轮副的动力可靠性分析

将一对啮合齿轮等效为单自由度随机振动系统,研究随机参数齿轮副在平稳随机激励下的动力可靠度的求解方法。从其平稳随机响应的表达式出发,同时考虑齿轮物理参数、几何尺寸的随机性,利用求解随机变量数字特征的矩法和代数综合法,导出随机参数齿轮副在平稳随机激励下位移及其导数响应的数字特征,再由动力可靠度的公式导出随机参数齿轮副动力可靠度的均值和方差的计算公式。通过与MonteCarlo方法结果的比较,验证文中方法的可行性和有效性。     

Using room temperature ionic liquid to fabricate PEDOT/TiO2 nanocomposite electrode-based electrochromic devices with enhanced long-term stability

In this work, poly(3,4-ethylenedioxythiophene)(PEDOT) was electrochemically incorporated with nano- and mesoporous TiO₂ films to form PEDOT/TiO₂ nanocomposite electrochromic electrodes. TiO₂ films were introduced to enhance the interfacial adhesion of the polymers to the substrates and thus increase the long-term stability of electrodes of electrochromic devices (ECDs). Room temperature ionic liquid (RTIL)- 1-butyl-3-methyl-imidazolium tetrafluoroborate ([BMIM]BF₄) was employed to serve as electrolyte during the entire fabrication processes. With these efforts, the ECDs were found to retain up to 95% of their optical response and electroactivity after 10,000 deep, and double potential steps, exhibiting enhanced long-term stability.     

中国风电发展现状、趋势及建议

介绍了我国风电发展现状及存在问题,分析了未来趋势并提出若干建议.     

100万千瓦核电中压排气缸高性能要求实现的研究探讨

通过测算GP280GH材料相变点参数及利用材质CCT图,结合工艺试验确定了核电中压缸的热处理工艺,并通过进一步优化成分,使核电中压缸性能指标中难度最大的硬度及强度分别高出标准下限20％和17％,并实现稳定批量生产.     

A fatigue reliability analysis method including super long life regime

An affordable and feasible method with moderate accuracy is developed to realize fatigue reliability assessment and life prediction including super long life regime (SLLR) through series of experimental researches on a railway axle steel and real axles. A competition damage mechanism for fatigue crack initiation and growth in SLLR is revealed to fascinate an understanding on wide fatigue damage behavior and to provide a weigh and balance on material primary quality control and on-line inspection capacity. Affordable material probabilistic strength-life (S-N) curves including SLLR are presented by an extrapolation approach on a concurrent probability rule between the S-N relations in mid-long life regime and the fatigue limits with a specified life definition. And then, structural probabilistic S-N curves are deduced by considering scale-induced effect on the material curves. Random cyclic stress-strain (CSS) relations are depicted for constructing structural random stressing history. Reliability assessment and fatigue life prediction are conducted by an interference model of the applied stress deduced from the random CSS relations and the strength capacity derived from the structural probabilistic S-N curves. Availability and feasibility of the present method are indicated by a successful application on a railway axle steel.     

基于UML实现XML文档自动生成

手工编辑生成XML数据文档不能适应快速大量的数据交换要求。编写代码也很难满足灵活多变的应用需求。尽管代码结构类似,却不能直接重用。这使得每次工作都得从零开始。文中提出了一种基于UML的XML描述方法,可以自动将关系数据库中的数据转换成XML数据文档,且描述简单容易,方便转换成基于不同平台的代码。     

Theoretical calculation and experimental study of influence of oxygen vacancy on the electronic structure and hemocompatibility of rutile TiO2

In this work, the relationship between electronic structure and hemocompatibility of oxygen deficient rutile TiO_2−x was studied by both theoretical calculation and experimental study. Based on the local density functional theory, first-principals method was performed to calculate the electronic structure of rutile TiO₂ with different oxygen vacancy concentration. In the range of less than 10% of (or equal) physically realistic O vacancy concentration, the band gap of rutile TiO₂ increases with increasing O vacancy concentration, leading the TiO₂ changes from a p-type to an n-type semiconductor. The valance band of TiO₂ is predominated by O 2p orbital, while the conduction band is occupied by Ti 3d orbital for different O vacancy concentration. The O vacancy results in the occupation of electrons at the bottom of conduction band of TiO₂, and the donor density increases with increasing O vacancy concentration. When materials come in contact with blood, the n-type semiconductor feature of oxygen deficient TiO_2−x with the bottom of conduction band occupied by electrons would prevent charge transfer from fibrinogen into the surface of materials, thus inhibiting the aggregation and activation of platelets, therefore improving the hemocompatibility of rutile TiO_2-x . Supported by the National Basic Research Program of China (Grant No. 2005CB623904), National High-Tech Research Program of China (Grant No. 2006AA02A139) and National Natural Science Foundation of China (Grant No. 20603027)     

确定截尾试验数据统计分布模型的方法

研究有替换定时与定数、无替换定时与定数共4种截尾可靠性试验数据统计分布模型的确定方法.首先把试验数据区分为失效与非失效数据两部分, 然后建立包含这两部分数据可能的假设分布的似然函数; 根据极大似然原理与微分极值原理,发展比较似然函数值、预测与生产实际情况的一致性和尾部预测的安全性确定较好统计模型的方法.实例说明方法的可用性.