Low-Temperature Aging of t-ZrO2 Polycrystals with 3 mol% Y2O3

A kinetic study of the aging behavior of tetragonal zirconia polycrystals (TZPs) from 100° to 500°C suggests that there exists a cricital grain size of 0.52 μm below which the tetragonal symmetry can be retained. Property degradation of TZPs at low temperatures is connected with transformation-induced microcracking. It is reported here that the temperature range of 100° to 400°C in which degradation occurs could be explained by an infinite incubation time for the lower limit and by the martensite starting temperature for the upper limit.     

苦参生物碱杀虫生物活性测定

以桃蚜等9种试虫为供试靶标，研究了苦参根提取物和苦参碱、氧化苦参碱、槐果碱、野靛碱的杀虫活性。试验结果表明：苦参生物碱具有一定的杀虫活性，9种试虫中，苦参根提取物对蚜虫的活性最高，其对蚕豆蚜的LC50为20．635mg／L；即使在最高剂量为4000mg/L时，也不能直接杀死粘虫、小菜蛾和棉铃虫。4种生物碱对朱砂叶螨活性均较低，LC50均大于2500mg／L。野靛碱是4种生物碱中杀虫活性最高的，对淡色库蚊、桃蚜、蚕豆蚜、褐飞虱和家蝇的LC50分别为172．431mg/L、207．667mg／L、85．212mg／L、266．179mg／L和763．224mg／L；而且对褐飞虱、桃蚜和家蝇的活性高于苦参根提取物，苦参碱对蚜虫的活性高于氧化苦参碱和槐果碱，槐果碱对淡色库蚊、褐飞虱和家蝇的活性高于苦参碱和氧化苦参碱。     

乳白玻璃条纹解决方案

对乳白玻璃瓶表面产生条纹的原因进行分析,通过耐火材料选用、稳定熔制工艺、工作池中层取料和供料道加搅拌的方法消除条纹缺陷。     

水泥粉磨站DCS控制系统的应用总结

我公司为适应市场需求，在外地建立了3个粉磨站，其中连云港粉磨站为年产75万t，宿迁和阜阳为100万t，3个粉磨站的工艺流程全部采用带辊压机的高细粉磨技术。因为粉磨站生产只有原料输送和储存、水泥粉磨及储存和包装出厂3个工序，所以控制系统相对简单。这3个粉磨站的不同在于熟料运输过程，宿迁粉磨站是利用大运河船运，熟料储存是用3万t的大棚库.     

聚萘二甲酸乙二醇酯(PEN)的研究及发展

综述了聚萘二甲酸乙二醇酯(PEN)的发展历史,合成工艺,应用领域及其与PET的性能比较。     

透明香皂的研制

介绍了生产透明香皂的新配方和新工艺 ,提出了透明香皂的企业标准。新工艺用丙二醇取代传统工艺所用的乙醇做溶剂 ,生产周期大为缩短。采用速冻隧道设备 ,可方便地实现不同品种的切换 ,操作方便 ,设备投资少 ,产品综合成本低 ,具有较大的工业应用价值     

我国高等学校法人治理结构的实施框架

高等学校法人治理结构的关键在于权力分配与权利制衡,目标在于真正落实高等学校的办学自主权。只有以现存的治理制度与组织结构为基础,引入现代企业治理结构和国外高等学校法人治理的经验,对高等学校的科层制管理结构进行改良,建立符合我国国情的高等学校法人治理结构,才是落实办学自主全权,完善自我管理的必要出路。     

Conditional probability Markov chain simulation based reliability analysis method for nonnormal variables

Based on fast Markov chain simulation for generating the samples distributed in failure region and saddlepoint approximation(SA) technique,an efficient reliability analysis method is presented to evaluate the small failure probability of non-linear limit state function(LSF) with non-normal variables.In the presented method,the failure probability of the non-linear LSF is transformed into a product of the failure probability of the introduced linear LSF and a feature ratio factor.The introduced linear LSF wh...     

改善钢桥面铺装层高温作用的有效措施

为了降低钢桥面铺装层内较高的温度,提高铺装材料使用性能,推迟桥面的早期破坏.采用有限元手段,以傅里叶传热定律为理论基础,根据气象部门提供的气象资料,对开放式钢箱梁及封闭式钢箱梁铺装层的温度场进行研究.结果表明:开放式箱梁可以降低桥面铺装层温度,降低高温持续作用时间,改变桥面铺装层高温的作用位置.     

Practical Control of a Ball-Screw-Driven Stage for Long-Range Nanometer Positioning

A DC motor and ball-screw-driven stage is studied for long-range nanometer positioning.The closed-loop system with high-gain PID controller is specially designed for high-precision point-to-point (PTP) positioning.A particular input shape of the closed-loop system is proposed to avoid overshoot and vibration by taking into account the nonlinear characteristics of the feed drive.Friction modeling and identification are avoided and the effect of friction is greatly suppressed by the controller.Experimental and simulated results demonstrate long-range nanometer positioning is achieved without overshoot.In PTP positioning from 10 mm down to 5 nm,the positioning error is within ±5 nm and response dynamic is satisfactory.