流态混凝土对透水模板布渗淤性能影响

基于侧压条件下对透水模板布（CPFL）浇筑混凝土前后的布料几何参数、渗排淤堵性能进行了测试,分析研究了不同类型CPFL一次使用前后的性能变化机理。研究表明,CPFL的厚度、孔径尺寸、混凝土浆体性能以及渗透压力对CPFL的水平渗透系数秭、垂直渗透系数肼、淤堵程度等影响显著,控制CPFL材料厚度、减小表层平均孔径、改善混凝土浆体配料可避免内部淤堵增加、渗透系数严重衰减,确保满足CPFL重复使用要求。     

CFD simulation of the effect of rain on the performance of horizontal wind turbines

Wind turbine power output is influenced by environmental conditions, including rain. Therefore, a better understanding of the effect of rain on the performance of wind turbines is necessary. Our coupled Lagrangian‐Eulerian multiphase computational fluid dynamics model was modified to more accurately simulate the momentum transfer during water film formation on the airfoils of a horizontal‐axis turbine and the performance loss caused by the rainwater film on the National Renewable Energy Laboratory (NREL) turbine performance. To obtain three‐dimensional numerical simulation of the wind turbine in manageable computational time, simplifying assumptions were made and the validity of these assumptions was verified by simulating the flow over the S809 airfoil of the NREL turbine. In a dry environment, simulation of turbine power output agreed well with NREL experimental data. Our multiphase model showed that the rain film accumulation and flow on the surface of the turbine airfoil reduces the power output of the turbine. © 2017 American Institute of Chemical Engineers AIChE J, 63: 5375–5383, 2017     

油田污水回注井下综合防腐技术应用

介绍了回注污水腐蚀井下油套管的作用机理,确定了内涂层防腐油管 机械卡封隔离防腐(或化学软密封隔离防腐)工艺的综合防腐措施。通过氢渗试验确定最佳的内涂层防腐油管为热固化环氧粉末喷涂油管,介绍了机械卡封隔离防腐工艺、化学软密封隔离防腐工艺的原理、特点、技术要求等。利用综合防腐技术进行了现场应用,效果良好。     

天荒坪抽水蓄能电站主坝水平位移回归分析

通过分析天荒坪抽水蓄能电站主坝水平位移实测过程线,采用统计模型法进行回归分析,得出精度较高的回归方程,利用该方程作为监控方程预报主坝水平位移观测值。     

Analysis of the stratified / nonstratified transitional boundary in horizontal and slightly inclined condensing flows

A mechanistic model has been developed for determining the stratified boundary for condensing flows in horizontal and slightly inclined tubes. Two formulations, a complete and a simplified version are considered for the equilibrium liquid level. Good agreement is found between the two formulations and generalized results were derived from the simplified version of the model. From these results, the effect of condensation is shown to be equivalent to adding a small upward inclination in adiabatic gas-liquid flow. The predicted transition line is compared with flow-regime data of different fluid properties, tube diameters, and inclinations. The predictions agreed reasonably well with the data.     

D-氨基酸氧化酶的研究进展

D-氨基酸氧化酶(DAAO)是一种以黄素腺嘌呤(FAD)为辅基的典型的黄素蛋白酶类.DAAO可氧化D-氨基酸生成相应的酮酸和氨.介绍了D-氨基酸氧化酶的研究现状,包括在自然界的分布、生理功能、生物学特性、催化机理、基因克隆和序列分析以及基因表达.     

氧化亚铁硫杆菌的分离培养及其浸磷效果

从安徽某煤矿的酸性矿坑水中分离出能有效浸出低品位磷矿的氧化亚铁硫杆菌菌株,对其形态特征和生长特性进行了初步的研究,并通过研究不同固体培养基成分对氧化亚铁硫杆菌分离纯化的影响,确定了适宜的分离条件：9K固体培养基的Fe2+浓度为4.5 g/L,采用下层涂布异养菌(红酵母菌)、上层涂布氧化亚铁硫杆菌的双层平板. 考察了培养基、能源物质及表面活性剂等因素对所选育的氧化亚铁硫杆菌的浸磷效果的影响,通过初步实验,浸磷率可达48%.     

水平搅拌器的改进设计

介绍了一种长期运行可靠、搅拌杆运行稳定、工艺操作适应性高的新型水平搅拌器,对平板玻璃行业的设计和生产具有一定的指导和参考意义.     

石油开采过程中水平井钻井技术的应用探析

水平井钻井技术可满足当前的石油开采需求,但由于配备不合理、施工难度大等问题,使这一项技术的应用受到了限制。针对此项技术存在的问题进行简要分析,并提出相应的改进措施。     

V型纵槽对水平螺旋管外冷凝传热的强化

用实验方法研究水平螺旋管管外有纵向 V型槽时凝结换热的强化问题。在相同真空度下 ,测试当 V型槽的角度或数目变化时管外凝结换热系数随冷却水流量变化的规律。实验结果表明 ,V型槽夹角为 6 0°,槽深为 1mm,槽数为 2 8时强化效果最佳。还在相同实验条件下 ,比较 V型槽水平螺旋管与矩形槽水平螺旋管及水平螺旋光管的传热效果 ,得到可用于工程实际的 V型槽水平螺旋管外冷凝传热的试验关联式