贵阳红黏土的应力-应变软化模型及参数研究

通过对不同含水量和不同围压下的贵阳红黏土进行三轴固结不排水试验,系统地研究了贵阳红黏土的软化特性及孔隙水压力的变化规律。试验结果表明:贵阳红黏土破坏形态具有明显的剪切带;应力-应变曲线出现了带有驼峰的应变软化现象,固结过程中孔隙水压力与时间呈指数函数关系,剪切过程中孔隙水压力与轴向应变呈双曲线型。研究认为,土体的结构屈服应力和固结不排水试验中产生的孔隙水压力是造成贵阳红黏土软化的主要因素。根据沈珠江、张尔齐等人的软化模型,对贵阳红黏土进行拟合,求解模型参数及置信区间,为贵阳红黏土进一步的数学模型建立提供理论基础。     

AP1000核电站安全壳厂房建造施工逻辑分析

对海阳核电一号核岛安全壳厂房进行了分析,时间范畴从安全壳底封头(CVBH)就位开始,一直到安全壳顶封头(CVTH)就位为止;空间上将安全壳厂房分为钢制安全壳(CV)本体构造、结构模块CA01与CV之间空间构造、CA01模块本体构造、CA01模块内部空间构造来论述分析。在构造分析的基础上,以CVTH就位前必须完成对施工的结构、系统及物项为研究对象,分析其建造逻辑关系,保证了建筑结构施工与安装施工的交叉进行,进而确保CVTH及早就位,降低了建造的风险。同时,该施工逻辑也得到了工程的实际验证,取得了良好效果。     

财富中心一期、二期工程电气设计特点分析

本文以财富中心一期、二期工程为例,分析了超大规模超高层建筑楼群工程电气设计的特点。     

城市记忆与传承

这个世界上有一个种群,别人都称呼他们为“记忆储藏师”。他们的工作是为有需求的人们记录他们的记忆,并当成“记忆遗产”保存在“记忆银行”。记忆储藏师根据合约,将记忆遗产进行处理．就好像人们的遗产按照遗嘱分配一样。记忆储藏师,日后将记忆遗产交托到继承人手上,继承人接受记忆遗产。这些．对继承人意义的探索,进而探索出记忆对人、对城市的启示作用     

预制混凝土装配式房屋外墙板接缝防水方法初探

采用预制装配式化的方法建造钢筋混凝土结构的建筑物是实现建筑工业化的主要途径之一。一般预制钢筋混凝土的外墙构件都是在构件都是在构件厂生产流水线上做好了外墙面的防水装修处理,但是,各预制外墙板的连接节点处的防水保温处理,则只能在施工安装现场进行。在预制混凝土建筑体系防水工程中,由于屋面地下工程及卫浴厨房间墙地面工程的防水措施国内相关标准图集已经有比较成熟的做法。而相对外墙板之间的连接板缝的防水是此类建筑体系防水的薄弱环节,主要涉及到各种外墙板的防水构造技术研究。本文针对对外墙雨水的活动特点和外墙接缝构造做法的分析研究,力求找出外墙构造做法一些规律性的东西,在今后面对种类繁多的需求可以做出正确和合理的外墙节点构造设计。     

水泥工业：循环经济链的重要一环

一、水泥工业特点及在发展循环经济中的重要地位1、我国建材工业中重点行业现状和存在问题近几年,随着国家经济的快速发展和城镇化进程的加快,我国主要建材产品产量快速增长,技术水平不断提高。但是,与国际先进水平相比,我国建材工业总体的落后面貌还未从根本上改变。目前存在的突出问题仍然是资源、能源消耗大、环境污染严重,与循环经济的要求还有很大差距。以占建材工业产值近一半的水泥为例,代表国际先进水平的能够大量节能降耗的新型干法水泥生产技术在行业中的比重越来越大,同时,仍有近70%的水泥产品是靠资源、能源消耗大、环境污染严…     

Artificial lift infrastructure planning of shale gas horizontal wells considering endogenous and exogenous uncertainties

Artificial lift methods (ALMs) lift the accumulated fluids from horizontal shale-gas-producing wells and help sustain well performance. An artificial lift infrastructure plan includes the selection of ALMs and their operating schedule. This paper presents two discrete-time large-scale nonconvex mixed-integer nonlinear programming models to solve the artificial lift infrastructure planning problem. Two equivalent mixed-integer linear programming models are formulated using the special structure of the nonlinear terms. A set of valid inequalities is defined to tighten the models and shorten solution times to two orders of magnitude, considering well production limitations. We incorporate endogenous uncertainty in ALM-dependent production rates and exogenous uncertainty in shale gas prices into the models. For a hypothetical case study under only endogenous uncertainties, the value of the stochastic solution is 5%. For the same case study, the exogenous uncertainty in gas prices does not change the optimum solution.     

Kinetics,mechanism, and simulation of hydrogen transfer reaction of α, β-unsaturated aldehydes to allylic alcohols

Homogeneous hydrogen transfer reactions of methacrolein (MAL) and isopropanol to methallyl alcohol (MAA) were investigated in batch reactor (Conv. 89%, Select 93.1%) and tubular reactor (Conv. 88.1%, Select 95%) using aluminum isopropoxide (Al(OPrⁱ)₃) as catalyst. Kinetic experiments on hydrogen transfer reactions and reaction order were investigated in batch reactor and tubular reactor. Response surface methodology was applied to optimize the optimum reaction conditions of hydrogen transfer reaction. Purification process of MAA from product mixture after hydrogen transfer reaction was simulated with Aspen Plus software; theoretical stages, reflux ratio, and feed stage of distillation tower were optimized. Density functional theory was used to investigate viable reaction pathway and to probe the catalytic mechanism between reactants and catalyst, including dehydrogenation, coupling, and hydrogenation reaction. Microscopic mechanisms of hydrogen transfer reaction from MAA to MAL were acquired in detail and could be easily extended to other series of hydrogen transfer reaction.     

碳氢/有机硅/低碳醇三元系泡沫及抑制煤自燃的效果分析

泡沫灭火剂是常用的火灾扑救方法之一,但常规泡沫灭火剂存在半衰期短,析液、聚并迅速而影响灭火效能的问题,基于火灾化学和活性剂技术,提出碳氢表面活性剂SDS、有机硅表面活性剂LS-99和低碳醇的三元系泡沫体系,并系统探究碳氢/有机硅/低碳醇的复配配比。通过表面张力、发泡高度、稳泡系数的大量测试,发现LS-99的临界胶束浓度为0.0083%。LS-99和SDS二元系在降低表面张力、提升发泡高度和稳泡系数方面具有良好的协同增效作用。在此基础上引入适量浓度的能够延缓泡沫析液、聚并的异丁醇,设计出了性能优良的碳氢/有机硅/低碳醇泡沫灭火剂。LS-99、SDS和异丁醇的质量分数为0.1%时,测试结果表明SDS/LS-99/醇三元系泡沫的发泡倍数可达52.5倍,25%析液时间可达210 s,300 s时的稳泡系数高达0.958,半衰期远超常规泡沫。煤自燃的灭火抑制实验表明,SDS/LS-99/醇三元系泡沫作用下,煤自燃各反应阶段的活化能相较于空气氛围均增大,反应难度增强;最大失重速率下降,反应剧烈程度减弱。初期吸热阶段的吸热量为78.3 J/g,大于空气氛围下煤氧复合的吸热量,吸热增幅高达2.16倍。放热阶段的放热量为1765.4 J/g,相较于空气氛围放热降幅达到15.15%,表明SDS/LS-99/醇三元系泡沫对煤自燃具有良好的灭火效果。     

Calculative and experimental study of the CFRP tape spring

A tape spring is a thin-walled, straight strip of material with curved cross-section, and the current trend is towards tape springs made of carbon fibre reinforced plastic (CFRP). In this paper, performance of the CFRP tape spring was studied and its bending moment’s calculative formula during opposite-sense bending process was derivated, also, the theoretical formula’s accuracy was assessed by means of detailed, non-linear finite-element analysis. Subsequently, a CFRP tape spring was practical designed and manufactured through twiningmoulding workmanship, and some experiments were conducted to study its bending characters, verifying the validity of the theoretical analysis and finite element simulation perfectly.