尼龙66盐中间体的下游产品开发

以环己烯、环己烷、环己醇等为例，介绍了尼龙66盐中间体的下游产品的生产与应用，指出企业应充分利用自己的原料优势，开发出更具有竞争力的产品，以提升企业的竞争力。     

The characteristics of hydrogen diffusion and concentration around a crack tip concerned with hydrogen embrittlement

Previously, we proposed a physical model for hydrogen diffusion and accumulation around the crack tip and performed accurate numerical analysis which takes account of the effects of both hydrogen diffusion and accumulation due to the stress gradient. Based on this analysis, the characteristics of hydrogen accumulation around the crack tip were clarified.Since the characteristics of stress corrosion cracking and corrosion fatigue are dominated by chemical anodic reaction, hydrogen embrittlement and dislocation mechanism, to perform the analysis on the competitive phenomenon by these mechanism and to relate the sensitivity of hydrogen embrittlement to the characteristics of corrosion fatigue, it is necessary to construct a exact physical law on the characteristics of hydrogen diffusion and concentration and to formulate the characteristics as a simple function such as diffusion constant, D, yield stress σ_ys, and stress intensity factor, K. The effect of stress field such as plane strain and plane stress on the hydrogen embrittlement is necessary to be clarified as the effect of specimen thickness on the hydrogen embrittlement.In this paper, based on this view point, the effect of D, σ_ys, and K on hydrogen embrittlement were investigated and formulated. A quantitative parameter which characterize hydrogen embrittlement was proposed for both cases of plane strain and plane stress conditions as the effect of specimen thickness on the hydrogen embrittlement.     

基于同态加密的可验证隐私数据聚合方案

为克服传统无线传感器网络数据聚合方案在数据保密计算、防止抵赖、抵御内部和外部攻击、追查并修复错误等方面的性能及安全性与效率上的不足,本文构造了一个基于数字签名和同态加密技术的可验证隐私数据聚合方案。采用ElGamal加密方案作为基础方案对隐私数据加密,并将传感器节点身份信息加入数字签名,使来自不同节点的数据具有可辨识性,从而使方案具备了验证数据及追查并修复错误的能力。采用了相关文献提出的保密干扰因子方法,使方案能够抵御内部攻击,并利用一类具有同态加性质的保密求和算法构造了一种不需要可信第三方的保密干扰因子生成方法,从而避免了引入可信第三方及由此带来的安全性与效率问题。给出了方案的安全性证明和效率分析,并就主要性能与一些典型方案做了对比。分析结果表明,本文方案是安全的,且整体性能优于已有方案。     

人眼灰度感知建模及其在图像增强中的应用

原直方图均衡化算法处理结果不理想,主要是图像灰度域上实现的均衡化并不代表人眼感知亮度域上的均衡化,对此提出人眼感知亮度域上的直方图均衡化算法,但由于使用的灰度人眼感知模型不准确,处理效果也没有得到明显的改善。提出一种灰度人眼感知模型的建模方法,利用实验测试的方法得到人眼视觉系统临界可见偏差曲线;再推导得到人眼对不同灰度背景下同等灰度差别的敏感度曲线;接着利用上一步结果再通过积分和归一化方法得到灰度人眼感知模型;根据以上灰度人眼感知模型对直方图均衡化算法进行改进。对比实验结果表明,提出算法相比于原直方图均衡化具有明显的改善效果,相比于CLAHE、BBHE以及HMF等直方图改进算法,也具有无需参数调节,增强效果显著和适应性强等优点。     

Radiographic study of interaction of shock and detonation waves in a high explosive

Collisions of shock and detonation waves in an HMX-based high explosive are experimentally studied with the use of flash radiography. Based on X-ray patterns, specific features of the wave-interaction process are identified, and qualitative differences are found in detonation formation and evolution in an explosive precompressed by a weak shock wave and in an undisturbed explosive. __________ Translated from Fizika Goreniya i Vzryva, Vol. 43, No. 3, pp. 132–138, May–June, 2007.     

欧标HE140H型钢的研制与开发

介绍了莱钢型钢厂小型生产线的轧制工艺、孔型系统以反HE140的主要设计与开发过程.阐述了该产品在研制过程中难点的发现及解决措施.产品一次试轧成功,尺寸和性能完全符合标准要求,满足用户需求,具有较大的经济效益和社会效益.     

Analysis of primary recrystallization texture and grain boundary character distributions of low temperature grain- oriented silicon steel

In surface, sub- surface and center layer of low temperature grain- oriented silicon steel, the primary recrystallization texture and GBCD(Grain Boundary Character Distributions) based on HE (High Energy) and CSL (Coincidence Site Lattice) grain boundary theories were studied by EBSD(Electron Backscattered Diffraction). The results show that the primary recrystallization textures are mainly ?? fiber and {114}??418?? texture. Goss grains are mainly distributed on the surface and subsurface layer and the average grain size decreases gradually from the surface to the central layer. The misorientation distribution between the matrix and the Goss grains is mainly concentrated in the 20??-45?? which can form the high energy grain boundary, and the Goss grains in the sub- surface layer has the highest proportion of misorientation in 20??-45??. The type of CSL grain boundary is mainly ??3 and a little ??5, ??7, ??9 boundaries could be found in matrix.     

氢对2091合金力学性能及断裂行为的影响

用动态充氢慢拉伸试验研究氢对２０９１铝锂合金力学性能的影响,用离子探针、透射电镜和扫描电镜研究合金的微观组织和断裂行为。结果表明,２０９１合金具有明显的氢脆敏感性,氢降低合金原子间结合能。合金氢脆敏感性和断裂特征与微观组织有密切关系。     

榴弹总体方案智能设计专家系统技术

榴弹智能设计专家系统技术是基于设计型的专家系统。设计型专家系统开发,采用面向对象的知识表达方法和多种推理机相结合的推理方法,完全利用计算机来完成榴弹的总体设计、方案论证、仿真分析和计算。专家系统技术实现了产品的仿真设计和智能化设计,是数字化分析和制造的基础。给出了榴弹智能设计专家系统的结构和功能实现方法,利用面向对象的知识表达方法和运行界面,实现了榴弹推理的模块化和系统化。榴弹智能设计专家系统技术初步在榴弹型号设计中得到了试用,为榴弹以及相似产品的快速智能设计,提供了平台。     

西门子HE型联合循环汽轮机的技术特点

上海汽轮机有限公司引进西门子与V94.3A型燃气轮机配套的HE型联合循环汽轮机的设计与制造技术。该型汽轮机与国内常规汽轮机相比,具有诸多特点。介绍了配套的燃机—联合循环汽轮机整体布置以及HE型汽轮机的结构布置特点;详细阐述了该型汽轮机的汽缸结构、滑销系统、支承方式、配汽系统、液压盘车装置以及各相关系统的设计特点。对HE型汽缸和润滑油系统采用模块化设计的优点及本土化生产问题,提出了思考与建议。