广州合银广场钢管混凝土柱可调定位底座设计与施工

广州合银广场工程位于广州市环市东路与淘金路交会处东南侧,地下４层,地上６０层,总建筑面积１１００００ｍ２,总高度２６９．２０ｍ,为外框内筒结构。从地下４层至４４层框架结构中,２２１４００、１５００钢管混凝土柱采用Ｃ７０高性能混凝土。钢材为１６Ｍｎ合金钢,厚２０ｍｍ、２２ｍｍ及２４ｍｍ。钢柱接头为内衬坡口焊。钢管混凝土柱采用插入式柱脚锚固于人工挖孔工程桩中,框架结构柱内力主要靠钢管混凝土柱壁与柱芯混凝土传递给桩基础,见图１。在工程桩中一次定位钢管的难度较大,故在吊装前需先安装钢管底座。底座施工…     

基于聚类和局部线性回归的初至波自动拾取算法

初至波拾取是地震数据处理中的关键步骤,会直接影响动校正、静校正和速度分析等的精度.目前,现有的算法受到背景噪声和复杂近地表条件的影响时拾取精度会降低.基于此,提出基于聚类和局部线性回归的初至波自动拾取算法(FPCL).该算法由预拾取和微调两个阶段来实现.预拾取阶段先基于k均值(k-means)技术找到初至波簇,再利用基...     

Temperature resistance of AM/AMPS/NVP copolymer microspheres

Iranian Polymer Journal - Functional monomers, such as 2-acrylamide-2-methylpropionic sulfonic acid (AMPS), N-vinylpyrrolidone (NVP), and acrylamide (AM), were copolymerized into terpolymer...     

搭建教竞联合平台,深化化工设计课程教学改革

我们搭建了全国大学生化工设计课程竞赛与化工设计课程教学联合培养平台,探索了化工设计课程教学与学科竞赛密切结合的培养模式,并通过深化教学改革、创新教学方法,提高了化工专业学生的工程实践能力,实现了高素质创新型、应用型化工人才的培养目标。     

γ能谱技术鉴定放射性核素的应用研究

鉴别测量未知放射性核素在核保障中是十分必要的.论文介绍了用γ能谱法鉴别测量放射性核素的基本原理,探讨了定量测量的主要影响因素,鉴定分析了铝块样品中未知放射性核紊种类及其量.经一定时间间隔后,再次测量该样品的结果与理论推算值一致,验证了方法是可靠的.     

磁场对正丁醇-水物系汽液平衡的影响

为探讨磁场对二元共沸物系汽液平衡的影响,在不同磁感应强度的磁场中,研究了正丁醇-水物系的汽液平衡.结果表明,外加磁场对正丁醇-水物系的汽液平衡有一定的影响,总体上呈正效应,即外加磁场有利于该物系的精馏过程.采用NRTL模型对正丁醇-水物系的汽液平衡数据进行了拟合,得到了不同磁感应强度下的NRTL模型参数,并进行了热力学一致性检验,验证了试验数据的可靠性.     

Dialkyl furan‐2,5‐dicarboxylates,epoxidized fatty acid esters and their mixtures as bio‐based plasticizers for poly(VInylchloride)

Dialkyl furan‐2,5‐dicarboxylates and epoxidized fatty acid esters (EFAE) of varying molecular weights and volatilities, as well as their mixtures, were investigated as alternative plasticizers for poly(vinylchloride) (PVC). The EFAE utilized were epoxidized soybean oil (ESO) and epoxidized fatty acid methyl ester (e‐FAME). All plasticizers were compatible with PVC, with plasticization efficiencies usually increasing with decreasing molecular weights of the plasticizers (except in the case of ESO, which was remarkably effective at plasticizing PVC, in spite of its relatively high molecular weight). In comparison with phthalate and trimellitate plasticizers, the alternatives generally yielded improved balance of flexibility and retention of mechanical properties after heat aging, with particularly outstanding results obtained using 30?50 wt % e‐FAME in mixtures with diisotridecyl 2,5‐furandicarboxylate. Although heat aging characteristics of the plasticized polymer were often related to plasticizer volatilities, e‐FAME performed better than bis(2‐ethylhexyl) 2,5‐furandicarboxylate, and bis(2‐ethylhexyl) phthalate of comparatively higher molecular weights. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42382.     

复合阻燃剂FR602对丁苯橡胶阻燃性能的影响

研究复合阻燃剂FR602替代三氧化二锑物对丁苯橡胶（SBR）阻燃性能、硫化特性和物理性能的影响。结果表明,阻燃剂FR602可以完全替代三氧化二锑与十溴二苯醚组成协效阻燃体系,胶料具有较大的氧指数及较高的垂直燃烧等级,阴燃现象显著减少,硫化特性和物理性能变化不大。