FRP约束钢筋混凝土柱中钢筋屈曲行为研究

通过FRP约束钢筋混凝土柱的单向和往复轴压试验,研究了外包FRP的断裂应变、刚度、以及加载方式对钢筋屈曲性能的影响。采用了两种不同的纤维材料:CFRP和PET FRP,二者具有不同的断裂应变(CFRP1.5%;PET FRP5%)。在试验分析的基础上,发展了考虑FRP侧向约束作用的弹性地基梁模型,该模型能够较好地分析FRP约束钢筋混凝土柱中钢筋屈曲行为。基于弹性地基梁模型和试验数据,提出了考虑FRP侧向约束作用的钢筋屈曲经验模型。并将该模型通过二次开发的方法写入OpenSees数值分析平台,对FRP约束RC柱的往复轴压行为进行数值分析,分析结果与试验结果吻合较好。研究成果可为精确分析FRP约束钢筋混凝土结构的抗震性能提供有力的工具。     

《废气治理环保项目劳动安全卫生设计专篇》编写要求

强调了劳动安全卫生设计的重要性，就《废气治理环保项目劳动安全卫生设计专篇》的编写方法进行了说明。指出了环保项目中常见的危险危害因素，并提出相应的防范技术措施。     

石灰凝胶阻化剂防灭火技术在高硫矿的应用研究

在分析现有凝胶阻化剂防灭火机理的基础上 ,笔者针对我国高硫煤矿采空区发火特点 ,研制出石灰凝胶阻化剂的配方 ,并对其防灭火机理进行了详细探讨 ,确定了喷洒该种阻化剂的工艺过程及其应注意的问题。根据现场试验的测定数据表明 ,石灰凝胶阻化剂对高硫煤矿的防灭火效果好     

Structural and electrochemical properties of annealed La1-xYxNi3.55Mno.4Alo.3Coo.75 hydrogen storage alloys

The effects of the annealing and partial substitution of Y for La on the structural and electrochemical properties of La_1-xY_xNi_3.55Mn_o.4Al_o.3Cr_o.75 (x = 0, 0.1 and 0.2) alloys were reported in the present work. The single-phased CaCu₅-type structure was retained after La was partially substituted by Y. However, the increase of Y content leads to decrease of the lattice parameters and the unit-cell volume. The annealed La_o.9Y_o.1Ni_3.55Mn_o.4Al_o.3Co_o.75 alloys shows typical isometric microstructure, indicating that the composition segregation is improved by annealing. Y substitution for La in the alloys is effective to improve the electrochemical properties at both room temperature and high temperature. A critical substitution content of Y is found at x = 0.1.     

A fouling suppression system in submerged membrane bioreactors using dielectrophoretic forces

A novel method was developed to suppress membrane fouling in submerged membrane bioreactors. The method is based on the dielectrophoretic (DEP) motion of particles in an inhomogeneous electrical field. Using a real sample of biomass as feed, the fouling-suppression performance using DEP with different electrical field intensities (60–160 V) and different frequencies (50–1000 Hz) was investigated. The fouling-suppression performance was found to relate closely with the intensity and frequency of the electrical field. A stronger electrical field was found to better recover the filtrate flux. This is because of a stronger DEP force acting on the biomass particles close to the membrane's surface. Above an intensity and frequency value of 130 V and 1 kHz, respectively the permeate flux was reduced due to an electrothermal effect.     

高压喷射技术加固地基的工程实践

概述了在辽宁大洼县田庄台抽水站地基处理工程中采用高压喷射注浆技术的实践经验，并介绍了从工程勘察、方案选择、设计、施工和检测的全过程。此项技术，经过长期沉降观测取得了良好的加固成果。     

Characterization and Release Kinetics of Allylthiosufinate and its Transforments from Poly(d,l-Lactide) Microspheres

In this work was described poly(d,l-lactide) microwave synthesis using tin(II) 2-ethylhexanoate initiated ring-opening polymerization. Polymerization was performed at 100 °C with monomer to initiator molar ratio ([M]/[I]) of 5,000 in 30 min. The achieved number average molar mass of obtained polymers (determined by gel permeation chromatography) was 102,320 g/mol, with the polydispersion index, Q, 2.80. Structural characterization was performed by FT-IR spectroscopy followed characteristic bands. For applicative purposes the obtained polymer was purified during the procedure of microsphere preparation. Biodegradable microspheres prepared from poly(d,l-lactide) have been widely studied in recent years and have become well established controlled drug delivery systems. In this work microspheres were loaded with allyl thiosulfinate (allicin) and its transforments products (ajoene and vinyldithiine), as pharmacological active substances. The morphology of the microspheres was analyzed using a scanning electron microscope. Allicin was synthesized by acid oxidation of allyl disufide and purification of obtained products by liquid–liquid extraction with diethyl ether. Obtained allicin, purity 73%, was transformed using microwave in acetone solution, at solvent boiling temperature, for 5 min. For the quality and quantity analysis of allicin and its transformation process was used LC/MS chromatography. (E)- and (Z)-ajoene were detected at retention time 3.1 and 3.3 min, respectively, whence 3-vynil-4H-1,2-dithiine and 2-vynil-4H-1,3-dithiine were detected at 4.3 and 4.8 min, respectively. Retention time of allicin was 2.93 min, according to liquid chromatography results. HPLC method was used for assessment of pharmaceutical substances (alicine and alicine transforments) releasing from microspheres at room temperature in solutions with different pH (pH = 3 and pH = 8) for 24 h.     

甘氨酸母液脱色废活性炭的微波-Fenton试剂氧化法再生

采用微波-Fenton试剂氧化法对甘氨酸母液脱色过程中产生的废活性炭进行再生,考察了废活性炭再生率的影响因素,并用SEM对再生活性炭进行了表征.实验结果表明,在Fenton试剂中n(H2O2)∶n(Fe2+)为24∶1、H2O2的浓度为25 mmol/L、溶液pH为3、反应温度为55℃、反应时间为18 min、微波功率为600 W时,废活性炭的再生率可达到75.80％.     

酸洗废液制备高纯氧化铁红

以钢板酸洗废液为原料,采用铁粉预处理、除杂、合成、水洗、干燥、煅烧等工序制备高纯氧化铁红.最佳工艺条件为:预处理温度80℃,预处理时间3h,铁粉加入量为理论值的1.5倍;除杂温度65 ℃,聚丙烯酰胺加入量60 mg/L;米用将FeC12溶液和饱和NH4HCO3溶液同时滴加入反应器的方式进行沉淀反应;煅烧温度800℃.在此工艺条件下处理酸洗废液,可制得纯度为99.3％的高纯氧化铁红.