清梳联纺长绒棉特细号纱应用技术探讨

介绍了清梳联的技术特点，对清梳联纺长绒棉特细号纱的实际应用问题进行了工艺试验及探讨，论证了清梳联纺长绒棉的可行性及取得的效益。     

嵌入式数控操作系统与任务模块划分研究

采用嵌入式计算机技术构建数控系统是实现开放式数控的重要方式。研究分析了系统中操作系统实时性实现和数控功能划分2个关键性技术。选择RT-Linux作为嵌入式操作系统,在此平台上根据操作系统特点和数控任务实时性和多任务要求,划分了数控任务模块,并对其优先级和相互间数据交换进行了设计。     

无机熔盐中脉冲铝镀层的研究

在190℃的AlCl3-NaCl—KCl共融盐中，对321型不锈钢板进行脉冲镀和直流镀。在钢板上获得银白色铝镀层。X射线衍射结果表明，两种情况均得面心立方结构的铝，但由脉冲镀所得的铝晶粒较小。对镀层进行性能测试分析。发现同为厚10μm的铝镀层，脉冲镀层硬度比由直流镀层高65HV，且脉冲镀层在耐蚀性和与不锈钢基体的的结合力上明显优于直流镀层.     

超声波辅助合成离子液体及其性能研究

以超声波辅助法合成了离子液体1丁-基-3-甲基咪唑氟硼酸盐([BM Im]BF4),对产物进行了光谱分析、电导率和粘度测定,并考察了其酯化反应的催化性能.实验结果表明:该合成方法具有合成条件简单、反应时间短、能耗低、易纯化等优点.[BM Im]BF4在甲醇中的最大紫外吸收波长为213 nm,IR图谱与文献报道吻合;分别以丙酮、无水乙醇和乙酸乙酯为溶剂,测得[BM Im]BF4的极限摩尔电导率分别为237.94 S·cm2·mol -1、47.22 S·cm2·mol-1和1.5411 S·cm2·mol-1.     

由拱管组成的复合管段固定支架受力计算

根据工程设计的实践，介绍了由拱管和波纹补偿器所组成的复合管段的固定支架受力计算方法和注意事项。     

COREX熔融气化炉热模拟研究

根据ＣＯＲＥＸ熔融气化炉的模拟试验，对预还原矿金属化率，煤种，预还原矿预热温度，煤炭流化床，炉渣，热平衡进行了分析研究，得到了合理的熔融气化炉冶炼参数。     

升华再结晶法制备AIN晶须及其生长特性

以AIN粉体为原料，加入适量的CaO-B2O3矿化剂，采用升华再结晶法制备AIN晶须．初步探讨了反应器及其合成温度对产物种类的影响，研究了晶须的结构特征及其生长机理．结果表明，初期的合成产物包括AIN晶柱、晶须和非晶AIN纤维，以VLS机制生长：后期产物为AIN晶须，表现为VS生长机制：XRD及TEM分析表明，晶须大多呈现沿｛2110｝、｛101l｝和｛0001｝，l＝0、1、2、3的晶面生长．多数晶须宏观生长轴向平行于这些晶面的法线，而部分晶须由于发生斜生长，导致宏观生长轴向与这些晶面的法线斜交．     

Computer Simulation of the Structure and Propertiesof Nanocrystals

This paper provides a computer modeling method for the study of nanocrystals. Structural features,such as the boundary component proportion, the reduced density proportion, the excess lattice parameter, and the radial distribution function, have been atomistically simulated. The energy and elastic properties also have been investigated. Simulation results indicate that the structure of grain boundaries in nanocrystals is different from those of the amorphous and the gas, or rather, it is a special structure with some degree of short-range order. Moreover, the structure of crystallites is not entirely the same as that in the perfect crystal lattice. The present simulation method may become one of the foundations of the theoretical study of nanocrystals.     

Bone growth and bone development in the presence of implants or after induced leg-lengthening studied using the Oxford Scanning Proton Microprobe

To respond to varying environmental demands the bone tissue in the body is under continual reconstruction throughout life. It is known that metallic elements are important for maintaining normal bone structure, but their roles are not well understood. More information about the effects of metal excess or deficiency is needed to help in the development of metallic bone implants and to improve the treatment of bone fractures and defects. The Oxford Scanning Proton Microprobe (SPM) is being applied in two studies involving metal ions in bone: (1) bone regrowth and bonding to titanium bone implants may be influenced by diffusion of Ti ions into the bone. We are using microPIXE to determine the metal ion content of bone developing in contact with implants of pure Nb, Ti and Ti alloys. (2) Bone lengthening as a surgical procedure is induced by fracturing the bone and allowing it to heal with a small gap between the fractured ends created by the use of external fixators. The gap can be slowly increased during the healing process to stimulate the production of new bone. The enzymes and other constituents of the developing bone need certain metals for their function. Using experimental animals we have studied the concentrations of the metals and whether a deficiency of trace metals limits the optimum rate of bone lengthening.     

State feedback stabilization of discrete linear switching systems subject to nonsymmetrical state and control bounds

Stabilization problem of discrete-time linear switching systems with bounds on the state and control input is solved in this paper.First,the synthesis of state feedback controllers that ensure the stab...