凝固时间和水泥标号对反射波法检测锚杆质量的影响

对反射波法检测砂浆锚杆的物理模型进行理论分析,得到了含阻尼系数的波动方程的解,并采用不同的水泥标号和凝固时间对阻尼的影响进行模拟试验.结果表明,在反射波法对锚杆质量检测的影响因素中,砂浆凝固强度对反射波的传播起主导作用,水泥标号的影响次之.     

对混凝土施工的几点意见

1、混疆土强度及主要影响因素混凝土质量的主要指标之一是抗压强度,从混凝土强度表达式不难看出,混凝土抗压强度与混凝土用水水泥的强度成正比,按公式计算,当水灰比相等时,高标号水泥比低标号水泥配制出的混凝土抗压强度高许多。所以混凝土施工时切勿用错了水泥标号。另外,水灰     

低等级混凝土试件强度偏高的原因分析

砼试件是检验、评定砼结构件质量的主要依据 ,在工程质量检测中发现有些检查结构件质量的试件强度过高 ,造成资源浪费。经实验发现造成强度偏高的原因主要有 :砼标号改为强度等级、出厂水泥标号富余系数大、试验室配制的砼强度与实际不符、施工操作不规范等     

矿渣、火山灰质水泥平均标号查定图

在水泥厂中,物理检验是研究水泥的性能、控制水泥生产的必要手段,特别是强度试验是进一步反应产品质量,保证工厂生产水平的必要制度。对出厂水泥计算平均标号需要化较长时间,为了便于计算,按照日常生产中所结累实际经验、设计了矿渣、火山灰质水泥平均标号计算图: 图下侧分别为矿渣,火山灰质水泥7天、28天实测抗拉强度的数值和7天、28天实测抗压强度数值。其上侧是相对应的各龄期标号。例如:某水泥工厂某月实测矿渣水泥各龄期强度如下,求其平均标号。     

混凝土经济配合比的研究

混凝土经济配合比问题,是建筑材料中有关混凝土经济的一个长期课题。人们由於以往长期经验累积的结果,会经我到了一些降低混凝土成本的方法(在苏联的文献中可以见到),将来还会不断地找到更多降低混凝土成本的新方法。　了解,我国一般施工单位的任务都很紧迫,设计完成后不久即须开工,因此往往来不及按照书上所规定的步骤进行配合试验,即先试验水泥标号(需时廿八天),然后再按照试验出的水泥标号作混凝土成分配合计算。而且按这样的步骤计算时所用的水泥标号,还是廿八天以前的标号,因水泥储藏廿八天,其标号(强度)可能降低5—8%,故舆实际水泥标…     

用凝灰岩代粘土生产水泥

德清水泥厂根据以前“石煤代粘土、石煤烧水泥”的经验,试用“凝灰岩代粘土”烧水泥初步获得成功。据去年11月下旬10天内生产的937吨水泥经物理检验结果标号425~#的达到百分之四十九、标号325~#的达到百分之五十一,质量良好。凝灰岩代粘土生产水泥,我国还没有完     

关于多头小直径深层搅拌截渗墙施工的初步探析

截渗墙成墙质量的影响因素较多,诸如地下水位的高低、水泥掺入量、水泥品种和标号、地下水和土壤含盐量及施工工艺等,均不同程度的对成墙质量发生影响。     

浅谈试验环境对水泥强度检验的影响

水泥强度是指硬化的水泥石能够承受外力破坏的能力，它是水泥重要的物理力学性能之一。检验水泥强度，一方面可以确定水泥标号，对比水泥质量情况；另一方面可根据水泥标号，在施工中设计砼强度，合理使用水泥，保证工程质量。水泥强度是一个相对值，同样的水泥用不同的检验方法就会有不同的强度值。为使水泥强度有一个统一的可比性，并正确反映水泥强度，各国都制订了强度试验方法标准，对每一品种水泥都制定了强度的品质指标。我国规定水泥胶砂强试验方法采用“软练法”，除规定标准的仪器、设备和试验方法外，还对试验的环境提出严格要求…     

水泥混凝土基层治理高速公路基层裂缝效果的调查研究

高速公路水泥稳定碎石基层破坏严重时,可以挖除上基层,使用低标号素混凝土（C15）替换原水稳基层。文章对合安、合徐两条高速公路中采用水泥混凝土基层维修的路段进行路况调查与检测,对其使用效果进行评价,并给出刚性基层维修路面病害的适用条件。     

φ1120×5700型水泥球磨机球料级配方案的探讨

水泥球磨机的球料级配是水泥生产研磨工序上一个值得探讨的重要问题。正确地进行球料级配,力求选择最佳的球料和球径级配,对于提高水泥产量和标号质量都具有一定的现实意义。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with