专业课双语教学存在的问题及改进措施

文章介绍了专业课双语教学的目标、教学形式及目前国内高校专业课双语教学存在的问题,并结合自身开展专业课教学的实践,提出了若干改进双语教学的措施。     

PP纤维水稳碎石抗弯韧性及疲劳性能试验研究

通过四点弯曲试验和疲劳试验,对聚丙烯(PP)纤维水泥稳定碎石和普通水泥稳定碎石半刚性基层材料的弯曲韧性及疲劳性能进行了研究。试验得到两种材料的荷载-挠度曲线,按照JCI和ASTMC1018-97标准方法,计算得到两种材料的韧性指数;试验还得到材料在不同应力水平下的疲劳寿命,并回归出疲劳方程。研究结果表明,与普通水泥稳定碎石相比,体积掺量仅为0.077%的PP纤维水泥稳定碎石的抗折强度提高约10%,极限变形提高150%,JCI韧性指数提高67.7%,ASTM C1018-97韧性指数提高36.1%~79.8%,疲劳寿命提高126%~352%,增强效果十分显著。同时,基于断裂力学原理,揭示了纤维的阻裂增韧和抗疲劳机理。     

石砌U型高桥台加固改进对策研究

石砌U型高桥台是西部山区公路建设中广泛采用的结构形式,也是一种受力复杂的砌体结构,在填土荷载和车辆荷载作用下经常发生局部开裂破坏这一有规律性的病害。为研究U型高桥台破坏机理并相应提出改进措施,解决局部开裂破坏问题,以模型试验及三维有限元数值模拟为研究手段,在分析常规U型高桥台破坏机理基础上,研究U型高桥台采用钢筋混凝土圈梁、前侧墙交界处倒角加固改进措施后的变形、破坏规律,分析改进措施的有效性。     

西安市人防工程通风设计中的几个问题

针对西安市人防工程通风设计中存在的问题，对照人防设计规范进行分析，提出了改进措施，以期提高人防工程通风设计的质量。     

饭店建筑空调系统存在的问题及其改进措施

介绍饭店建筑在用空调系统设计、施工和维护保养中存在的一些问题,并提出相应的改进措施。     

棒材上料台架故障分析及改进

介绍了上料台架影响生产的主要原因及采取的改进措施,改进后提高了设备的可靠性.     

Proteomic Analysis of Embryogenesis and the Acquisition of Seed Dormancy in Norway Maple (Acer platanoides L.)

The proteome of zygotic embryos of Acer platanoides L. was analyzed via high-resolution 2D-SDS-PAGE and MS/MS in order to: (1) identify significant physiological processes associated with embryo development; and (2) identify changes in the proteome of the embryo associated with the acquisition of seed dormancy. Seventeen spots were identified as associated with morphogenesis at 10 to 13 weeks after flowering (WAF). Thirty-three spots were associated with maturation of the embryo at 14 to 22 WAF. The greatest changes in protein abundance occurred at 22 WAF, when seeds become fully mature. Overall, the stage of morphogenesis was characterized by changes in the abundance of proteins (tubulins and actin) associated with the growth and development of the embryo. Enzymes related to energy supply were especially elevated, most likely due to the energy demand associated with rapid growth and cell division. The stage of maturation is crucial to the establishment of seed dormancy and is associated with a higher abundance of proteins involved in genetic information processing, energy and carbon metabolism and cellular and antioxidant processes. Results indicated that a glycine-rich RNA-binding protein and proteasome proteins may be directly involved in dormancy acquisition control, and future studies are warranted to verify this association.     

压缩机出口管道事故分析及改进

通过分析一起制氧装置压缩机出口管道事故,总结了压缩机进出口管道配管方式及补偿器的应用,提出了改进措施。     

某汽轮发电机组真空低原因分析及系统改进

以某干熄焦余热电站的两台CC25-8.83/3.2/0.981型汽轮发电机组为例,通过对影响真空因素的分析和查找,最终找到导致真空低的主要原因是多级水封存在缺陷,并提出水封系统改进方案,使凝汽器真空达到运行要求。