混凝土

The preparation of electromagnetic shielding concrete adulterated short carbon fibers and graphite respectively have been introduced in this paper.

介绍了分别掺杂短碳纤维和石墨的电磁屏蔽混凝土的制备，研究了短碳纤维和石墨的含量对混凝土低频电磁屏蔽效能的影响，最后分析了短碳纤维的加入对石墨混凝土电磁屏蔽性能的影响机理，为将来设计高性能低频电磁屏蔽混凝土提供了依据。

The relationship between stress and strain of concrete in prestressed concrete bridge s is written as algebraic form within load duration and the equilibrium equations of internal force and compatibility conditions are introduced.

首先将预应力混凝土桥梁中考虑收缩、徐变影响的任意时刻混凝土应力、应变关系在持荷时段内写成代数形式，引入内力平衡方程及变形协调条件后，提出了计入截面上钢筋位置、配筋率、预应力钢筋松弛、混凝土弹性模量随时间变化等影响的徐变效应分析的全量形式自动递进法，并建立了计算式，适用于任何形式的收缩、徐变特性表达式；基于建立的全量形式公式，可方便地求解任意时刻混凝土、钢筋的应力与应变和梁体竖向变形。

The research contents mainly include: First, the influence of foundation constraint condition to the temperature stress is analyzed, the temperature stress formula of ultra-long concrete anchor plate is deduced, then the influence of length to structure crack can be gotten from the formula. Second, a breathing method is set up to solve the problem of temperature stress in ultra-long concrete constructions. By setting the sliding floor, a breathing system is built up and the temperature stress reduced distinctly. Third, the effect of prestress technique in the control of temperature stress is analyzed, it is simulated and calculated through FEA to get the right way to apply the prestress. Forth, the delay of temperature field and unsteady conduction is considered, the temperature field of ultra-long concrete structure with later poured band is simulated, then temperature stress distribution after casting the concrete is calculated, finally the effect of later poured band to temperature stress of ultra-long structure is analyzed.

本文的研究内容主要包括：(1)分析了基础约束对超长混凝土结构温度应力的影响，推导了超长混凝土地基板温度应力公式，从而得出长度对结构裂缝的影响；(2)针对超长混凝土裂缝问题，提出了一种可呼吸的解决方法，通过设置滑动层，使结构成为一种"可呼吸"体系，从而有效的降低温度应力；(3)分析了预应力技术在控制超长结构温度应力中的作用，通过有限元模拟计算，得到合理的预应力施加方式；(4)考虑温度场的滞后效应及不稳定传导，对带后浇带超长混凝土结构浇注后的温度场仿真模拟，计算浇注后的温度应力分布，分析后浇带对超长结构温度应力的影响。

The life cycle unit cost and military performance of three types′ material concrete are surveyed in this paper, which are steel fibred concrete, cement concrete and asphaltum concrete.

1引言钢纤维混凝土是在水泥混凝土中均匀乱向地掺入短而不连续的钢纤维，使混凝土变成了以钢纤维为拉结料的复合混凝土材料。

The main products of our company are: Ready—mixed concrete mixer, ready—mixed concrete batcher, ready—mixed concrete mixing plant, trailing concrete pump, mobile concrete mixing canister, soil—cement mixing plant and engineering machinery series etc.

公司主要产品有：混凝土搅拌机、混凝土配料机、混凝土搅拌站、拖式混凝土输送泵、搅拌车罐、稳定土厂拌设备、工程机械等系列。不断追求设计与制作的完美，愿与您精诚合作，共创美好未来。

The article finally through analyzing of the Zhejiang YiwuBinwang bridge temperature load, obtained the CFST arch bridge temperature stress rules with the temperature load which is including from top to bottom and from margin to core of arch-rib when the temperature value、 steel pipe wall thickness value and marking value of concrete change. The rule is that the axial force、 bending moment, as well as the shearing force elevates along with the change of temperature increases, so the control section stress which is linear relationship is. The article further proved the change of steel pipe wall thickness and marking value of concrete is not remarkable influence on temperature stress and internal force of arch ribs control section.

文章最后通过对浙江义乌宾王大桥温度荷载分析，得出了在由上至下和由周边向核心呈梯度变化的温度荷载作用下钢管混凝土拱桥结构应力随温度值、钢管壁厚值和混凝土标号值变化时的规律，即：轴力、弯矩以及剪力随着温度变化值增大而增大；钢管混凝土拱桥主拱肋的控制截面应力值亦随之增大，基本呈线性关系；并通过计算论证了拱肋各截面应力、内力值同钢管壁厚的变化、核心混凝土标号变化无关。

Through a comparison test on the performance of waterproof agents for as- phalt concrete pavement,the article con- cludes that the waterproof agent used in bituminous concrete can effectively seal and block the internal hole of bituminous concrete,and keep the humidity from ente- ring the inner part of concrete....

文章通过对沥青混凝土路面防水剂防水性能进行对比试验，表明沥青混凝土防水剂可以有效的封堵沥青混凝土内部孔隙，防止水分进入混凝土内部，可以起到防水路面水损害的作用，同时指出沥青混凝土防水剂对路面抗滑性能存在负面影响等应注意的问题。

Our main products are: computer automated rapid freezing and thawing of concrete tester, concrete carbonation chamber, concrete move Miriam, concrete to accelerate the conservation of boxes, concrete mixer, cement mortar conservation tank, cement rapid conservation boxes, cement paste mixer, cement glue sand mixer, cement mortar Tap Taiwan, the electric bending testing machine, making me boil marcescens, electric saws stone machine, sieve analysis of negative pressure device, Rutting Tester, Pavement Deflection Tester, rotating compaction test equipment etc..

公司主要产品有：微机全自动混凝土快速冻融试验仪、混凝土碳化试验箱、混凝土动弹仪、混凝土加速养护箱、混凝土搅拌机、水泥胶砂养护水槽、水泥快速养护箱、水泥净浆搅拌机、水泥胶砂搅拌机、水泥胶砂振实台、电动抗折试验机、雷氏沸煮箱、电动锯石机、负压筛析仪、车辙试验仪、路面弯沉试验仪、旋转压实仪等试验设备。

In the process of building and using the mass concrete structures, because of the effect of out-side condition and themselves, some faults will form in the structure, these faults will effect the bearing capability and endurance Using nondestructive testing method to test the concrete"s quality and diagnose its healthy, which has the significant sense in assessing the safety stability and research of the administering diseasesThis dissertation mostly researched the testing methods in the mass concrete structure, discussed the principles, methods, features, sphere of application of the ultrasonic testing in the mass concrete structure with faults, used dynamic FEM to simulate the testing process, discussed when the concrete structure with cracks is under the effect of the pulse, how the elastic waves propagate and what are their changing feature, Researched the principles of the first-arriving waves" phase when the cracks" depths are not same, obtained the relation between the inversion point and the cracks" depth, which has the direction sense in the application of projects,The second part of this dissertation is CT , which used the ultrasonic wave running through the tested-substance to get arriving-time of the ultrasonic wave, then inverse the image This dissertation drawed one CT program which can well present the different little cells ultrasonic wave velocity profiles of the substance, thereby to diagnose the quality of the part of the tested-substance, CT has the better using foreground..

在混凝土结构的施工及使用过程中，由于受其自身及外界各种因素的影响，常常会产生一些缺陷，对结构物的承载能力和耐久性造成严重影响，采用无损检测技术进行质量检测和健康诊断，这对混凝土结构开展安全、稳定性评估以及病害隐患治理研究具有重要意义。本论文主要针对大体积混凝土结构缺陷的检测方法展开研究工作，重点讨论了超声波法检测混凝土结构裂缝的基本原理和方法及其特点、适用范围，运用动力有限元数值模拟其检测过程，探讨了有裂缝缺陷的混凝土结构在脉冲荷载作用下弹性波的传播及其变化特征，研究了不同裂缝深度下首波相位变化规律，得出了反转临界点与裂缝深度之间的关系，这对实际工程应用具有指导意义。声波CT是一种新的无损检测技术，它是利用声波穿透被检测体获取声波接收时间，来进行计算机反演成像的技术。本文利用直射线法编制了层析成像程序，能较好地呈现被检测物体各微小单元的声波速度分布图像，从而对检测体的质量状况作出诊断评估，具有较好的应用发展前景。

The reasons of concrete's crack forming and the component of Shrinkage Reducing Admixture SRA were analyzed in this paper. The mechanism of restraining concrete cracks by SRA was studied detailedly. The effect of SEA was validated in accordance with the experiment data and microcosmic data.

通过对混凝土的裂缝成因及混凝土减缩剂的功能成分分析，对SRA抑制混凝土裂缝出现的机理进行讨论结合实验结果，分析SRA对混凝土裂缝形成的抑制效果，从微观角度验证了SRA对混凝土收缩的抑制机理。

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。