CPE系列聚合物改性路用沥青

研究了氯化聚乙烯(CPE)系列聚合物体系对改性沥青性能的影响．以及CPE含量、母料比例等对改性沥青的影响。实验结果表明．母炼胶法制备的改性沥青能够取得较好的效果。通过对CPE体系和CPE—g—MAH体系的比较．能直观的看到界面相容性对改性沥青起着至关重要的作用，使改性沥青呈现较好的延度、针入度和软化点。同时。对改性沥青的工艺进行了探索。     

射线探伤中环焊缝一次透照长度计算的探讨

通过对一次透照长度概念的分析以及对环焊缝内透偏心法(F相似文献   

月桂氮草酮研究进展

介绍了月桂氮草酮作为高效皮肤促渗剂的发展概况、合成工艺、研究进展及其应用前景。     

BackTrack5在网络渗透取证技术中的应用

本文对目前针对Linux平台下的BackTrack5进行阐述,内容涵盖敏感信息收集,漏洞信息收集,漏洞工具测试,账户特权升级等,笔者对在虚拟机环境下运行,下载BackTrack5,加载运行BackTrack5后需要进行网络配置加以说明,同时针对各种工具的常用命令及基本应用,实践后对其优缺点加以说明。     

浮法硼硅酸盐玻璃下表面渗锡的研究

根据实验样品的成分,制定一定的浮法成型的温度制度,采用自制小型石墨锡槽,模拟硼硅酸盐玻璃的浮法成型过程,用电子探针结合能谱仪,测试浮法硼硅酸盐玻璃在1250~650℃温度范围内不同温度段下表面渗锡的分布情况,研究硼硅酸盐玻璃不同于传统钠钙硅浮法玻璃的渗锡特点。研究结果表明,在特定的浮法工艺制度下,硼硅酸盐玻璃渗锡的深度达到40μm左右,并且高温段锡离子以纵向深度扩散为主,低温下锡离子主要在玻璃的近表面富集。在浮法成型的过程中,渗锡的分布曲线上会出现卫星峰,但是最终在出锡槽的温度下渗锡曲线是单调递减的。     

Alekseevskii-Tate revisited:An extension to the modified hydrodynamic theory of long rod penetration

The modified hydrodynamic theory of long rod penetration into semi-infinite targets was established independently by Alek-seevskii and Tate over forty years ago and since then many investigators contributed much to the development of the high speed penetration mechanics.However,in all the models proposed so far,the target resistance Rt is not well defined and usually determined by adjusting it until the predicted depth of penetration comes to an agreement with experimental data.In this paper,assumptions are...     

Analysis Model on Penetration Depth of Concrete by Eroding Long-Rod Projectiles

Mass loss should be considered while calculating the penetration depth of concrete by eroding long-rod projectiles of high velocity.The penetration process is divided into two phases:eroding phase and rigid phase.During eroding phase,a model to predict the penetration depth is established on the assumption that there is a chipping region in the bottom of crater.During rigid phase,Forrestal formula is adopted to calculate the penetration depth.Using this model,the depth of concrete penetration by a tungsten alloy long-rod projectile is calculated.When the critical eroding velocity is between 950 m/s and 1 000 m/s,the result is in good agreement with the experimental data.     

Application of artificial neural networks to the prediction of tunnel boring machine penetration rate

Rate of penetration of a Tunnel Boring Machine(TBM)in a rock environment is generally a key parameter for the successful accomplishment of a tunneling project.This paper presents the results of a study into the application of an Artificial Neural Network(ANN)technique for modeling the penetration rate of tunnel boring machines.A database,including actual,measured TBM penetration rates,uniaxial compressive strengths of the rock,the distance between planes of weakness in the rock mass and rock quality designation was established.Data collected from three different TBM projects(the Queens Water Tunnel,USA,the Karaj-Tehran water transfer tunnel,Iran,and the Gilgel Gibe Ⅱ hydroelectric project,Ethiopia).A five-layer ANN was found to be optimum,with an architecture of three neurons in the input layer,9,7 and 3 neurons in the first,second and third hidden layers,respectively,and one neuron in the output layer.The correlation coefficient determined for penetration rate predicted by the ANN was 0.94.     

郑州地区粉土承载力确定方法的探讨

结合郑州地区典型岩土工程勘察实例,分析了以往采用理论公式计算法、参数查表法、静力触探参数计算法和载荷试验法等粉土承载力确定方法,探讨其中所存在的局限性。粉土承载力与原位测试值呈近似线性关系,而与土工试验参数相关性相对较差。提出了用原位测试法如标准贯入（SPT）和静力触探（CPT）等确定郑州地区粉土承载力的地域性经验公式。     

高能级强夯在湿陷性黄土地区的应用

根据8000、12000kN·m高能级强夯大面积处理地基加固的综合检测试验数据,结合室内试验数据及黄土地区的特殊性,得到了高能级强夯在黄土地区的有效加固深度、湿陷性处理效果;分析了高能级强夯处理湿陷性黄土的加固效果、加固深度及能级变化对地基处理效果的影响。结果表明：该研究为进一步分析高能级强夯的加固机理,尤其在湿陷性黄土地区的加固机理提供了依据,也为高能级强夯的大面积设计、施工和检测提供了优化数据。