调速系统故障分析与处理一例

长广煤矿发电厂N25-35-1型汽轮发电机组在供汽负荷增加到20t/h时负荷调节失效,通过调速系统的运行原理分析和现场调查,发现压力变换器滑阀脏污,运行中滑阀开度又到达以前很少使用的死角,造成滑阀卡涩,引起调速系统故障。经过清理后故障排除,运行正常。     

Paclitaxel formulation with stable sustained-release behavior and its biological safety evaluation

Biological safety and stable sustained-release of the drug are two crucial issues involved in the formulation of paclitaxel.Focusing on these issues, by using the FDA approved polylactide as carrier material, soybean lecithin as surfactant and maltodextrin as thickener, paclitaxel loaded PLA microspheres were simply prepared by solvent evaporation, thus guaranteeing the biological safety. The introduction of maltodextrin as a thickener aided to a stable sustained-release of paclitaxel. Surface morphology, particle size, drug loading rate, encapsulation efficiency and in vitro drug release behavior were investigated.Biological safety evaluations such as acute toxicity, allergies, hemolysis, skin stimulation and genotoxicity test were also carried out. Results showed that the obtained microspheres were biocompatible and could release paclitaxel at a desirable constant rate.Therefore, the simply prepared paclitaxel formulation with good biological safety and desirable release behavior exhibited great potential of local injection of paclitaxel for the clinical use in the future.     

探索特种金属合金板带项目的自主技术集成

介绍了国内自主技术集成为主建设的特种金属和合金板带炉卷热轧项目特点和技术难点。通过对特殊钢热轧板带工艺装备和控制系统成套方面的探索和研发,积累了相关工程设计和技术服务经验。     

清梳联工艺与生条质量

清梳联工艺要在确保产量前提下可最大限度减少棉结和纤维损伤,如何在清花工序各设备实现“薄喂轻打合理”的工艺选择;梳棉工序实现“分梳,梳理适度”,提出了针布几何形状与实现有效分梳的新理念,分析了清梳系统实现“连续均匀喂给”、“优化气流参数”的工艺效果。     

浅谈数学教学中的素质教育

在论述数学教学中素质教育基本内涵的基础上，探讨了数学教学中实施素质教育的基本方法。     

内外花键间隙对行星轮系均载特性的影响分析

行星轮系的均载特性是其主要的性能指标之一.国内外多项研究指出,行星轮系中构件的浮动作用对于系统均载具有重要的影响.考虑太阳轮与输入轴的花键连接关系,模拟花键内外齿的摩擦和太阳轮的约束浮动,建立了输入轴花键对太阳轮的非线性支撑反力,以5行星轮传动系统为例,采用集中质量法计算了不同花键径向间隙下的系统均载系数,为行星轮系均载设计提供了依据.     

浅谈企业创新文化的建设

阐释企业创新文化的内涵,分析目前我国企业创新文化建设的现状,在此基础上提出了建设企业创新文化的几点建议。     

Application of entropy production theory to hydro-turbine hydraulic analysis

The understanding of hydraulic behavior in the hydro turbine requires the detailed study of fluid flow in the turbine. Previous methods of analyzing the numerical simulation results on the fluid machinery are short of intuitiveness on energy dissipation.In this paper, the energy dissipation was analyzed based on the entropy production theory. 3-D steady flow simulations and entropy production calculations of the reduced hydro turbine were carried out. The results indicated that the entropy production theory was suitable for evaluating the performance of the hydro turbine. The energy dissipation in the guide vanes area weighted nearly 25% of the whole flow passage, and mainly happened at the head and tail areas of the vanes. However, more than half the energy dissipation occurred in the runner, mostly at the leading edge of runner blade and the trailing edge of run-ner blade. Meanwhile, close to 20% of the energy dissipation occurred in the elbow. And it can be concluded that the method of entropy production analysis has the advantages of determining the quantity of energy dissipation and where the dissipation happens.     

电力变压器磁通中三次谐波的抑制

分析了电力变压器磁通中三次谐波产生的原因及危害,提出了抑制三次谐波的措施。     

焊膏用水溶性免清洗助焊剂的研究

选用水溶性物质作为制备助焊剂的原料;以有机酸和有机胺复配为活性组分并采用丙烯酸树脂对其进行微胶囊化包覆处理;采用正交试验优化助焊剂配方,并进行回流焊接模拟.结果表明：复配活性物质可以调节焊剂pH值接近6且不降低活性.微胶囊化处理可以很好的消除腐蚀.该焊剂制备的焊膏焊接性能良好、存储寿命长.焊后残留少、无腐蚀、易水洗,焊点饱满、光亮,焊层薄而明晰.