Carburization of 310 stainless steel exposed at 800-1100 °C in 2%CH4/H2 gas mixture

Carburization of 310 stainless steel has been investigated after cyclic exposures at high temperatures 800-1100 °C in a 2%CH₄/H₂ carburizing gas mixture for 500 h duration. A thermodynamic analysis indicates that 1000 °C is an approximate boundary temperature, below which the environment should result in mixed oxidizing/carburizing behavior, while above this temperature reducing/carburizing behavior should occur. The experimental results agree well with the thermodynamic analysis. Below 1000 °C, 310SS suffered external carburization, oxidation, and internal carburization. In excess of 1000 °C, extensive external carburization occurred and internal Cr-carbides disappeared. Cr segregation is proposed to interpret the effect of temperature on the continuity of an external scale layer and carburization behavior.     

Graft mechanism of acrylonitrile onto starch by potassium permanganate

The graft mechanism of acrylonitrile (AN) onto starch under the initiation of potassium permanganate was investigated. The relationships of the grafting rate and the concentrations of potassium permanganate, AN, and backbone starch, as well as the reaction temperature, were established. On this basis, the equation for the rate of the graft copolymerization was derived, and the apparent activation energy for the graft copolymerization was obtained. Through the study of the oxidation reaction of starch with manganic ions, the valence changes of manganic ions during the graft copolymerization, and the grafting ability of different starch derivatives, together with electron spin resonance analysis, the grafting mechanism for the graft copolymerization of AN onto starch under the initiation of potassium permanganate was determined. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 146–152, 2003     

Study on Robot Sequencing Model in Flexible Manufacturing System Using Timed Petri Net

１ＩｎｔｒｏｄｕｃｔｉｏｎＯｖｅｒｔｈｅｐａｓｔｄｅｃａｄｅ，ＦｌｅｘｉｂｌｅＭａｎｕｆａｃｔｕｒｉｎｇＳｙｓｔｅｍｓ（ＦＭＳ）ｈａｖｅｒｅｃｅｉｖｅｄｓｉｇｎｉｆｉｃａｎｔａｔｔｅｎｔｉｏｎｆｒｏｍｒｅｓｅａｒｃｈｅｒｓａｓａｎｅｗｍａｎｕｆａｃ...     

基于智能Agent技术构建移动数据库系统模型的研究与实现

现有的移动数据库体系大都是在传统的基于固定网络的分布式数据库技术的基础上进行改进,但是这些改进并不能真正满足需求,尤其是当移动用户规模变的十分巨大的时候,这些体系就会明显的暴露其缺陷。对Agent和Multi-Agent的研究近几年来已成为分布式人工智能研究的一个热点。Agent是具有拟人智能特性的、驻留与活动于客观世界中的实体。Agent技术的自主性、主动性、反应性、移动性和社会性等优良特性,使它非常适合移动计算环境,理所当然成为实现移动数据库体系的首选。该文系统、深入地研究了基于Agent的移动数据库体系的模型系统,并实现了其在移动业务处理系统中的一般应用。     

预处理对聚吡咯/羊毛复合导电纱线性能的影响

为了改善聚吡咯/羊毛复合导电纱线的导电性,采用化学原位聚合的方法,以纯羊毛纱线为基材,以吡咯为单体,三氯化铁为氧化剂,十六烷基三甲基溴化铵为掺杂剂,制备了聚吡咯/羊毛复合导电纱线。根据羊毛纤维湿热条件的拉伸特性,采用机械拉伸和机械/化学试剂共同作用的方法,改变羊毛纤维的鳞片结构和表面性质,增加吡咯与羊毛纤维的反应位点。为了进一步提高复合导电纱线的导电性,采用多次负载的方法,增加聚吡咯在羊毛纱线上的负载。实验结果表明:经过预处理后的聚吡咯/羊毛复合导电纱线具有较高的强力和较低的初始模量,其导电性能大大提升,电阻值由未经处理的730Ω/cm下降到34.83Ω/cm。     

多联机空调系统设计选型的探讨

结合工作实践,对多联机市场目前存在较多的不合理选型问题进行分析,阐述不合理选型带来的危害.同时,通过工程实例列出不同的设计选型方法进行比较,并结合实测数据得出结论.最后,针对多联机系统选型提出一些合理的建议.     

Coarse-to-Fine Speech Emotion Recognition Based on Multi-Task Learning

Journal of Signal Processing Systems - Speech emotion recognition is very challenging because the definition of emotion is uncertain and the feature representation is complex. Accurate feature...     

Fault-tolerant routing algorithm based on disjoint paths in 3-ary n-cube networks with structure faults

The Journal of Supercomputing - The 3-ary n-cube network is widely used in large-scale multi-processor parallel computers. It is an important issue to design high-performance communication...     

JIC单点计算法与试样厚度的关系

运用断裂力学方法讨论了ＪＩＣ单点计算法与试样厚度的关系．结果表明，在平面应变条件下，试样厚度的改变不影响ＪＩＣ单点计算公式的使用；本文工作为使用Ｂ＝Ｗ／１．２、Ｓ＝４Ｗ试样进行ＪＩＣ单试样解析法提供了理论依据     

基于理性Agent的有序对等计算社会模型的研究

目前的对等计算(P2P)环境呈现出不稳定的无政府状态,存在的搭便车、公共悲剧以及虚假文件、共谋、不合作等问题使得各类闲置的资源得不到有效的利用,系统难以达到资源的最大共享,也得不到持续的、良性的发展.引入理性Agent技术,将节点改造为对等主体.对等主体被组织为若干个对等组,从而形成结构化的对等计算社会.为了使对等计算社会能够协调地、可持续地良性发展,重点研究对等计算社会中的信任机制,提出CMTM分类多级信任模型及改进的全局信誉度算法,并对系统和信任模型进行仿真实验予以验证.