黄土深基坑支护结构变形优化研究

用同济启明星深基坑支挡结构分析软件对西安地区黄土深基坑围护结构的变形进行了分析,对影响围护结构变形的诸因素进行了优化,达到控制排桩围护结构变形和节省造价的双重目的,并指出现有设计中应注意的因素。     

浅谈给水管网的二次污染

分析了给水管材对二次污染的影响,介绍了给水管道中生长环的生成,探讨了屋顶水箱引起的二次污染,提出了降低给水管网二次污染的措施,以保证居民生活用水质量,从而保证社会经济的持续稳定发展。     

二次受力下碳纤维布加固钢筋混凝土梁的分析

以有限元软件ANSYS为分析工具对二次受力状态下碳纤维布加固钢筋混凝土梁的受弯承载力进行了非线性分析,并与试验值进行对比,结果表明：ANSYS计算值与试验值吻合较好,初始荷载的存在会降低碳纤维布加固的效果,建议在实际加固工程中尽可能卸载,以保证加固效果。     

浅析对建筑院校大中专学生的教育探讨

针对如何对建筑院校大中专学生进行道德礼仪教育这一课题展开探讨,从道德礼仪的内涵、重要性、教育的途径等方面进行了阐述,以达到使学生具有良好道德礼仪的目的。     

A Novel Immobilization Method of Urease in Silk Fibroin Scaffolds by Annealing at Constant Temperature and Humidity

Temperature and humidity (TH) post-treatment is a relatively mild way to change the silk fibroin (SF) secondary structure. Here, urease is immobilized in SF scaffold (SFS) by TH post-treatment, and the effects of annealing on the immobilized urease activity are examined. Fourier transform infrared indicates that the SFS secondary structure started to transform when the scaffold is annealed at 35 °C with 100% relative humidity for 20 min. The higher the temperature, the lower the treatment time is required to change SFS structure. Compared to methanol annealing, TH post-treatment maintains the original form of the sample, and the scaffold shows better water-binding abilities. The maximum recovery ratio of immobilized urease is 98.4 ± 7.0%, which is obtained after the scaffold is postprocessed at 35 °C for 60 min, and the relative recovery ratio of the urease activity is still as high as 80.6 ± 12.1% after repeatedly measuring 10 times. In addition, the relative recovery ratio of urease is not significantly decrease within 4 weeks of storage. Therefore, TH annealing is a relatively mild and effective way to immobilize urease in SFS. The urease-immobilized SFS with hydrophilic properties and prolonged enzyme activity may be used for peritoneal dialysate regeneration systems.     

淀粉酶对二次纤维的改性研究

淀粉酶是一种生物催化剂,酶的专一性决定其不会对纤维自身的强度造成不利的影响.用淀粉酶处理二次纤维,能水解纤维表面吸附的淀粉,增加纤维均匀分散的程度,有利于提高纸料的滤水速度、成纸强度.研究发现:当α-淀粉酶的用量为25IU/g绝干浆时,对二次纤维(OCC)的改性达到了最佳效果,成纸的环压指数为7.961 N·m/g,抗张指数为3.12N·m/g,挺度为1384mN·m.     

膨润土改性及其对二次纤维的微粒助留助滤作用

针对柠檬酸钠与常规的碳酸钠改性，探讨了钠化剂对膨润土改性产品性质及膨润土助留助滤效果的影响。结果表明，柠檬酸钠改性膨润土的粒度更小、水分散性更好，对二次纤维具有良好的助留助滤作用。在CPAM用量为0．05％时，两种改性膨润土的最佳用量均为0．2％～0．5％，且柠檬酸钠改性膨润土的性能及对抄遗体系的pH值适应性更强，助留助滤效果更好。     

Effects of secondary electron emission coefficients on Townsend's second ionization coefficient in argon dielectric barrier discharges

One‐dimensional fluid model simulations are performed to investigate how the secondary electron emission arising from ions (γ_i), metastable atoms (γ_m), and photons (γ_p) affect Townsend's second ionization coefficient (γ′) in argon dielectric barrier discharges. Since Townsend's breakdown criterion determines the value of γ′, it is naturally affected by the discharge condition such as the reduced electric field (E/p) as well as the combination of γ_i, γ_m, and γ_p. It also depends on the other contributions from the indirect ionization processes such as cumulative ionizations or metastable–metastable collision ionizations. When the nonionic electron‐yielding processes such as the effects of γ_m, γ_p, and the indirect ionizations are considered, the calculated γ′ increases largely under the higher pd (pressure times distance) branch of the Paschen curve. Since the experimental characteristics of γ′, which decreases with E/p, can hardly be explained without such nonionic processes, the contributions of those processes can be quite important in Townsend discharges especially under high pd conditions. These processes tend not to appear and γ′ tends to converge to γ_i under the lower pd branch of the Paschen curve. The value of γ_i can possibly be estimated by using γ′ under the lower pd condition. © 2014 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.     

基于UG二次开发技术的麻花钻参数化设计

根据麻花钻的钻刃曲线方程及麻花钻后刀面锥面刃磨法成形的相关参数,利用UG软件表达式功能建立其实体模型。采用VC＋＋对UG进行二次开发,实现麻花钻的参数化设计,达到对麻花钻进行参数化设计及自动造型的目的,为麻花钻进行几何设计、制造、切削性能分析和对钻削过程进行仿真研究奠定基础。     

新型复合式露点间接蒸发冷却空调机组的试验研究

分析新型复合式露点间接蒸发冷却空调机组的芯体构造和工作原理。选择高湿度地区代表城市——福州,在7月份,对新型复合式露点间接蒸发冷却空调机组的工作电流和电压、机组风压、湿球效率、二/一次风量比、淋水量、耗水量等性能参数进行实际测试。结果表明:复合式露点间接蒸发冷却空调机组二/一次风量比为0.95时,机组的平均湿球效率为103%,机组在200L/h的淋水量下运行10min,需要消耗1.2L的水。将机组应用于一个室内模拟1kW发热源的房间,测试得到了机组运行的实际效果,并提出机组优化的试验参考。