振动拌和对混凝土强度及其抗冻性能的影响

为研究混凝土振动拌和过程中的振动参数对混凝土强度和抗冻性能的影响，通过正交试验分析了振动功率、振动时间、拌和次数对混凝土抗压强度的影响，得到了实验室条件下混凝土振动拌和的最优参数组合；在此基础上，对以该最优振动参数振动拌和的混凝土试件进行冻融试验，分析了振动拌和对混凝土抗冻性能的影响.试验结果表明，振动功率对混凝土试件的抗压强度影响较为显著，而振动时间对其影响较小；振动拌和可有效提高混凝土的抗压强度，以本试验获得的最佳振动参数振动拌和的混凝土，其28d抗压强度较相同配比的静力搅拌的普通混凝土抗压强度提高24.31%；随冻融循环次数的增加，经振动拌和的混凝土试件的质量损失率和抗压强度损失率均明显低于采用静力搅拌的混凝土的相应指标，振动拌和有助于提高混凝土的抗压强度和抗冻性.     

振动参数对振动流化床干燥特性的影响

以酒糟、酱油渣、玉米和小麦为试验物料，以振动强度为振动参数的综合指标，在振动流化实验台上，分析了振动参数对振动流化床干燥特性的影响．提出了最佳振动强度的概念，给出了玉米最佳振动强度的经验式；利用临界振动强度和最佳振动强度的概念，从机理上解释了振动参数对等速干燥段和降速干燥段的干燥特性如何影响的问题．另外，还进行了振动参数与其他工艺参数的交互作用分析．     

钻柱振动诊断方法的研究

详细研究了诊断钻柱振动特征的各种方法，分析了处理钻柱振动信号的有效措施，并对不同类型钻柱振动的识别方法进行了全面分析，为今后实时识别钻头和钻柱的振动特征奠定了基础     

变速箱振动信号的分解及在故障诊断中的应用

建立了变速箱故障振动理论模型，模型考虑了箱体内部各齿轮，轴承和轴不对中时对箱体复合振动信号的影响，利用时域同步平均技术和小波分析技术分别地将化振动信号，轴不对中故障振动信号和轴承故障振动信号从箱体复合振动信号中分离出来，并利用分离出来的振动信号成功地诊断了变速箱的典型故障。     

振动切削机理的研究状况

主要对振动切削理论进行了分析和总结，从振动切削的特点入手得出了对振动切削机理研究的必要性，同时对已形成的振动切削机理的理论进行了总结，给出了振动切削机理的研究状况，并通过阅读大量的相关材料给出了今后振动切削机理的研究方向。     

环形肋板动反力分析

基于弹性波传播理论和板的弯曲振动方程，分析了环形薄板的伸缩振动和弯曲振动的特性，推导了与边界位移、振动频率有关动反力的方程，并计算了径向动反力随周向波数ｎ和振动频率变化的趋势．     

振动对人眼视觉功能的影响

探讨了在振动环境下，振动频率，振动量级，振动方向以及被监控目标的字符大小，间距，字体和清晰程序等因素对人眼视觉功能的影响。为人机系统的设计与振动控制提供了可靠的依据。     

基于LabWindows/CVI5.0的织机振动测试系统的开发设计

寻求一种简洁、快速、实用的织机振动测试方法，运用虚拟仪器技术开发了织机振动测试系统，介绍了振动检测原理，开发设计了基于LabWindows／CVI5．0平台的织机振动数据采集以及数据分析软件；完成了织机振动测试系统软硬件的连接，并对织机振动进行实时检测实验，从而验证了该方法的可行性和有效性．为国内新型织机机械性能的动态检测提供可行的检测手段，也扩展了虚拟仪器技术的应用领域．     

振动压路机对建筑物的振动影响及控制对策

为了治理振动压路机施工时对建筑物的振动影响，对采取隔振措施前、后振动压路机诱发的振动进行了测试，对试验数据进行了回归分析，并对隔振前、后的地面振动数据进行了对比研究。结果表明：地面振动波传播衰减规律符合负幂指数函数形式，隔振沟隔振效果明显，最小安全施工距离隔振前为12m，开挖隔振沟后为7m。     

三维流体诱发振动的理论模型与数值模拟

建立了三维流体诱发振动的理论及数值模型，采用任意拉格朗日-欧拉框架下的三维非定常Navier-Stokes方程组及波动方程组，分别描述了流体的流动及结构振动．流动及振动控制方程组分别采用基于非结构化运动网格上的有限体积法和有限差分法求解．对刚性、受限振动及自由振动的三维圆柱体进行了数值计算．结果表明：圆柱的自由振动基本上为Strouhal型涡诱发振动，即每个截面按“8”字型轨迹运动，且横向振幅远大于流向振幅，计算结果与现有的实验及数值解吻合较好．首次采用流体诱发振动模型对极限环振动模式进行了定量分析，发现在圆柱中间截面附近高频气动力对振动起阻尼作用，而在端面附近气动力与位移间的稳定相位差对振动起激励作用．     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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