论建设工程领域"连带责任"之扩张

连带责任加重了个别相关人的责任,因此需要谨慎适用.建设工程领域存在扩张适用连带责任的趋势,是立法层面功利主义的表象.     

混凝土排水管道工程闭气检验简介

简要介绍排水管道闭气检验的特点、闭气检验标准的试验原理、闭气检验的操作步骤及应用现状。     

掺粉煤灰高强混凝土强度的试验研究

对以细度为600m^2／kg的粉煤灰为掺合料的高强混凝土的试验进行了研究，利用试验得出了水胶比为0．3，掺合量为20％的配比为最佳方案。同时亦表明了粉煤灰高强混凝土的强度受水胶比、掺合量、养护条件和温度等多方面因素综合影响。     

层状强透水地层的降水方法探讨

本文分析了强透水地层的渗透规律,并以某基坑为例分析其降水方法。     

浅谈建筑空间的视知觉表达

对建筑空间中人的视知觉进行了研究,并对比例、尺度、序列、图和底的关系,光影、色彩、材质、符号等建筑空间形态要素及其表达进行了分析介绍,指出建筑师是利用空间中视知觉的规律和特点,用空间形态的语言来表达其设计思想,从而在设计当中自然得以体现。     

旋挖钻孔混凝土灌注桩常见质量问题防治措施

针对桩位偏移、桩孔倾斜、塌孔等旋挖钻孔混凝土灌注桩常见的质量问题，就其产生的原因进行了分析，并提出相应的预防措施和处理办法。     

少筋混凝土受弯构件设计方法综述

摘要介绍了国内、外主要规范关于少筋混凝土构件的设计方法,并作了比较和评述,归纳出一个适用于不同要求的少筋混凝土受弯构件脆性破坏的附加系数公式,作为结构重要性系数的一个组成部分,以便于设计.     

钢绞线压花锚锚固性能试验与分析

以宁波招宝山大桥西引桥A、B匝道后张法预应力连续箱梁采用钢绞线压花锚锚固技术的工程实例,叙述了压花锚锚固性能试验中试块尺寸、测点布置、实验装置及加载方法,并作了试验结果分析。     

Selective removal of gallium (III) from aqueous solutions containing zinc or aluminum using sodium di-(n-octyl) phosphinate

Gallium was removed selectively from aqueous solutions containing zinc or aluminum using sodium di-(n-octyl) phosphinate as a ligand (NaL). At low pH or low mole ratios, the gallium was removed by complexation with the ligand as GaL(3(S)), while the zinc or the aluminum remained in the solution. Nearly complete separation of gallium was obtained. By increasing the amount of ligand or by increasing the pH, the zinc or aluminum remaining in the solution was then removed as a solid complex: ZnL(2(S)) or AlL(3(S)), respectively. At a pH between 1.5 and 2 and a mole ratio ligand to total metals of 0.75 for zinc solutions and 1.0 for aluminum solutions, more than 98% of the gallium was selectively removed with a high molar selectivity, alpha(Ga/Zn) and alpha(Ga/Al), respectively. Over 95% of gallium was recovered from the solid GaL(3(S)) complex by treatment of the complex with a 3M NaOH solution and diethyl ether. The gallium was concentrated in the aqueous solution to 4 times its initial concentration and the ligand was extracted into the ether phase. After evaporation of the ether, 95% of the ligand was regenerated in its sodium form as a solid.     

多层次模糊综合评定在测绘质量管理中的运用

阐述了用模糊数学的计算方法来评定测绘产品的质量优良等级的方法,并进一步结合Excel的计算功能,实现产品质量评定的科学化.