循环经济的生态化学工程技术支撑

阐述了循环经济的工程科学内涵及循环经济的技术支撑体系,着重论述了生态化学工程对实施循环经济的技术支撑作用.     

LED灯具的眩光评价与防治概述

眩光是评价照明质量的1个重要方面.通常情况下,可分为失能眩光和不舒适眩光.主要讨论不舒适眩光的评价方法-UGR和应用,介绍影响眩光评价的因子,并提出了一些防治眩光的方法.结合国内外目前的照明状况,指出现今通用的眩光评价系统的缺点,并提出了改善意见.     

上海国际设计中心脉动测试研究

对不等高双塔连体建筑上海国际设计中心进行了结构自振频率和阻尼比的脉动法现场实测,并对实测结果运用SVSA2.0软件进行数据处理分析,最后将分析结果与设计软件分析结果和振动台模型试验结果进行对比.研究发现主塔楼和副塔楼在长轴方向能够较好地共同工作,而在短轴方向协同性较差.脉动法实测自振周期与其他方法分析结果较接近,实测阻尼比小于规范建议值.     

Fabrication of a low‐cost nano‐SiO2/PVC composite ultrafiltration membrane and its antifouling performance

A novel low‐cost SiO₂/Polyvinylchloride (PVC) membrane with different nano‐SiO₂ particles loading (0–4 wt %) was prepared by the phase‐inversion process. The optimum nano‐SiO₂ dosage was determined as 1.5 wt % based on the casting solution compositions, the membranes' mechanical properties and hydrophilicities, the pure water fluxes, microstructures, and absorption of protein. Compared with the bare membrane, the membrane with 1.5 wt % nano‐SiO₂ addition presented better capabilities against the protein absorption and bacterial attachment, better antifouling performance, and higher flux recovery ratio in filtration of the supernatant liquor which collected from a secondary sedimentation tank in a municipal wastewater plant. The SiO₂/PVC membranes have applicable potential in the municipal wastewater treatment for their low price, good antifouling performance and high removal efficiencies of SS (over 97.2%), COD (up to 82.9%) and total bacteria (more than 93.6%). © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 41267.     

预应力预制叠合梁受弯性能试验研究

传统预应力混凝土叠合梁大多采用矩形截面,存在自重大、运输及吊装困难等问题,提出了U形与倒T形两种预应力预制叠合梁.进行了3根U形预应力预制叠合梁、3根倒T形预应力预制叠合梁与1根整浇梁的对比试验,研究其破坏机理、受弯承载力、短期刚度、变形特征及裂缝分布等,并将试验结果与规范计算结果进行了对比.研究结果表明:从开始加载到...     

Relationship on structure and properties of polyurethane modified Diels–Alder addition polymer

A series of linear and crosslinked polyurethane modified materials were prepared by Diels–Alder cycloaddition reaction. Based on raw materials, some novel equations were designed and effects of equation parameters on the mechanical properties of modified material were explored. It was demonstrated that tensile strength of modified materials and elongation at break were changed from 3.68 to 18.71 MPa, 200 to 866%, respectively. In addition, the optimal reaction temperature of retro-Diels–Alder (r-DA) reaction was determined by differential scanning calorimeter (DSC). Gel permeation chromatography (GPC) and tensile experiments were used to characterize the properties of repolymerized material after degradation. The results indicated the optimal temperature of r-DA for linear and crosslinked polyurethane modified materials is 127 and 150 °C. Moreover, after decomposed, the product was slowly repolymerized at 60 °C, and can more effectively restore material strength under the action of the solvent to achieve self-healing effect. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47355.     

预制T形肋底板混凝土叠合板弯曲疲劳性能试验研究

为研究T形肋对混凝土叠合板弯曲疲劳性能的影响,进行了预制T形肋底板混凝土叠合板和整浇板的弯曲疲劳性能对比试验。通过对比试验得到了不同疲劳循环加载次数下的跨中挠度、混凝土应变、预应力筋应变、残余变形等,研究了试件在疲劳循环荷载下的刚度退化情况、荷载 应变分布、裂缝分布及残余承载力等。结果表明：经历200万次疲劳作用后,预制T形肋底板混凝土叠合板无明显刚度和承载力退化,增设T形肋的叠合板能达到与整浇板相同的疲劳性能。基于试验结果,给出了预制T形肋底板混凝土叠合板正截面弯曲疲劳强度计算假定以及正截面弯曲疲劳应力验算方法。     

Preparation of Deoiled Soy Lecithin by Ultrafiltration

Deoiling of soy lecithin through ultrafiltration (UF) using an inorganic ceramic membrane was examined in a favorable solvent medium (hexane). Phospholipid (PL) reverse micelles with an average particle size of 9.8 nm were prepared in a 1:3 soy lecithin/hexane system (m/m) with 9% water added at a temperature of 25 °C. Consequently, an inorganic ceramic membrane with a pore size of 5 nm was selected. UF was employed in continuous diafiltration mode at transmembrane pressure (TMP) of 0.25 MPa, and a final deoiled lecithin product with a high acetone insoluble (AI) content of 96.32% was obtained at a yield of around 84%.     

基于阻抗分压法的风电机组低电压穿越能力试验研究

介绍了电网对风电机组的低电压穿越能力的要求及其阻抗选取,根据阻抗分压原理推导出了阻抗配置原则,通过对风电机组低压穿越能力的现场试验,证明了阻抗配置原则的正确性和准确性,同时对今后阻抗分压法的风电机组低电压穿越能力检测试验提供了参考.     

基于Simulink的直流融冰系统零功率试验分析与仿真

零功率试验是验证直流融冰系统功能完好性的有效手段。以某500 kV变电站直流融冰系统为例,简述了零功率试验原理,基于MATLAB/Simulink建立了相应的仿真模型,对直流融冰系统零功率试验时的稳态运行工况、直流侧和交流侧谐波、晶闸管的换相过电压进行研究,仿真结果与实际较符合,证明了仿真模型的有效性。