Microstructure and mechanical properties of a basal textured AZ31 magnesium alloy cryorolled at liquid-nitrogen temperature

A strongly basal textured AZ31 magnesium alloy were cryorolled at liquid-nitrogen temperature at various strains. The microstructure and texture of the rolled sheets have been investigated using electron backscatter diffraction (EBSD) and X-ray diffraction. The microstructural and textural evolutions of the AZ31 magnesium alloy during cryorolling have been discussed. A lot of twins were observed in the rolled sheets. The influence of strain on the twin types and variant selection during cryorolling for the magnesium alloy has been discussed quantitatively based on the orientation data collected using EBSD. The influence of the twins on the microstructural and textural evolutions for the AZ31 magnesium alloy during cryorolling has also been discussed. The mechanical properties of the cryorolled sheets were tested by uniaxial tensile tests at the ambient temperature with a strain rate 10^-3s^-1 in the tensile direction respectively along the rolling and transverse directions of the rolled sheets. The relationships between the mechanical properties and microstructure of the cryorolled sheets have been discussed in the present work. The active twinning during rolling at that cryogenic temperature has been found to play an important role in influencing the microstructure, texture, as well as the mechanical properties of the AZ31 magnesium alloy.     

入侵检测中数据挖掘技术的应用

本文阐述了入侵检测,分析了入侵检测引入数据挖掘的优势,详细介绍了入侵检测中的数据挖掘研究方法,之后提出了一种自适应的入侵检测系统,该系统采用数据挖掘中关联／序列规则和分类算法,能使入侵检测更加自动化,提高检测效率和准确度,最后对入侵检测中数据挖掘技术进行了展望。     

基于领域工程方法的电子政务系统应用平台

按照领域工程的实施过程对电子政务系统平台分别进行了需求分析、软件体系结构和应用系统实施方面的研究，较详细地介绍了一个基于构件的电子政务系统应用开发平台的体系结构，对其进行了分析和说明，并相应提出了一种业务构件集成方法。     

Multiplexed affinity-based protein complex purification

Here we proved the principle of a multiplexed affinity-based protein complex purification (MAPcP) technique that targets simultaneous extraction of multiple protein complexes with superior purity. Microspheres of various sizes and coupled with different affinity probes extract several protein complexes concurrently and specifically. After the coextraction, flow-field flow fractionation (Fl-FFF) rapidly washes the microspheres as well as separates them based on their sizes to recover the clean individual complex for downstream analysis. Demonstration of the parallel extraction of two immuno-complexes from the yeast whole cell lysate showed that MAPcP can enhance the sample purity significantly compared to the traditional centrifugation and magnetic pull-down methods used for small scale protein purification. Simultaneous isolation of multiple protein complexes can facilitate the elucidation of the functional relationship among protein complexes and improve our understanding of the biological network.     

关于次梁作用于主梁上的扭矩问题的探讨

本文通过工程实例 ,分析了次梁作用于主梁上的扭矩引起主梁抗剪扭箍筋超筋的问题 ;并提出了对此类问题的处理办法。     

搅拌摩擦焊接Al-Mg-(Zn) 合金的腐蚀行为

本文研究了搅拌摩擦焊接含Zn Al-Mg合金的腐蚀行为及焊后热处理对搅拌摩擦焊接合金腐蚀行为的影响。结果表明,经焊后热处理后不同焊接区的最大腐蚀深度和主导腐蚀模式随Zn含量增加而发生明显变化。Zn的加入使主导腐蚀模式由晶间腐蚀变为点蚀。与加工硬化态合金相比,时效硬化态合金具有严重的电偶腐蚀倾向。对于析出强化Al-Mg-Zn合金而言,这在很大程度上与不连续分布的晶界析出相及丰富的晶内析出相的形成密切相关,而对无Zn的Al-Mg合金,其则与连续分布的晶界β-AlMg相相关。     

交直流三级电脱盐技术在炼油工业上的应用

采用先进的交直流三级电脱盐装置,改造炼油厂前原油的脱盐工艺,实现了原油的深度脱盐,原油含盐由脱前〉２００ｍｇ／Ｌ降到脱后的〈３．２ｍｇ／Ｌ以下,从而延长了常减压装置的开工周期,减少了催化裂化装置催化剂的耗量。     

SIMULATION OF SOLIDIFICATION BEHAVIOR IN SPRAY DEPOSITED PREFORMⅠ. Theoretical Analysis

本文采用“虚拟”凝固层的概念,通过对沉积坯件内凝固过程的理论分析。建立了相应的理论模型,为进一步分析沉积坯件中的凝固行为提供了理论依据。     

Shale gas reservoir modeling and production evaluation considering complex gas transport mechanisms and dispersed distribution of kerogen

Stimulated shale reservoirs consist of kerogen,inorganic matter,secondary and hydraulic fractures.The dispersed distribution of kerogen within matrices and comp...     

熔铸-原位反应喷射成形金属基复合材料制备新技术

研究开发了一种喷射成形金属基复合材料制备新技术———熔铸－ 原位反应喷射成形技术。该技术的突出优点是： 解决了颗粒损失和颗粒在合金基体中分布不均匀的问题; 合金的熔炼、颗粒的生成以及喷射成形金属基复合材料的制备同步进行, 明显缩短了复合材料的制备工艺流程, 降低了材料的制备成本。利用该技术制备了３ ％ ＴｉＣ／Ａｌ 复合材料。研究表明, ＴｉＣ 颗粒在铝基体中分布均匀, 制备的３ ％ ＴｉＣ／Ａｌ 复合材料组织致密