凌钢高炉风口攻关实践

分析了风口破损的原因 ,并采取了缩小进风面积、提高标准风速 ,推广使用斜长风口 ,减少原燃料入炉粉末 ,活跃炉缸工作 ,提高冷却强度等措施 ,大大减少了风口破损数量。与 2 0 0 2年相比 ,风口 (小套 )破损率下降了 45 %以上。     

氟化钡晶体质子辐照损伤分布的计算

根据经典辐射理论，描述质子辐照BaF2晶体的能量损失，讨论受照晶体的辐照损伤分布，用Monte Carlo方法模拟碰撞过程，具体用TRIM程序分别计算出能量为1．5Mev和2．0Mev质子辐照BaF2晶体所产生的辐照损伤，对计算结果进行讨论，将这两种能量情况下的BaF2晶体辐照损伤分布进行比较。得到的结论与实验结果基本相符。     

Influence of calcination temperature on structural and optical properties of TiO2-SiO2 thin films prepared by sol-gel dip coating

We prepared TiO₂-SiO₂ thin films with various TiO₂/SiO₂ ratios by sol-gel dip coating method and explored the dependence of their structural and optical properties on calcination temperature. The absorption peaks relevant to Si—O, Si—O—Ti and Ti—O bonds appeared in the FTIR spectra. With increasing TiO₂ content, the intensity of Si—O bond peaks decreases and that of Ti—O bond peaks increases. The XRD results show that the temperature of transformation from amorphous to anatase phase is lowered as TiO₂ content increases. The crystallite size of anatase phase in composite thin films increases with increasing TiO₂ content and calcination temperature. At 1000°C, the mixed phase of anatase and rutile appears in the pure TiO₂ thin films. The rutile films are denser than the anatase films. The increase in refractive index of composite thin films with calcination temperature is related to the decreased thickness and increased density as a result of evaporation of water and organic matters below 400°C. On the other hand, it is related to the change in the crystal phase and crystallite size of the films over 400°C.     

声表面波谐振器无源无线传感虚拟仪器系统

分析了在通用硬件平台上结合软件设计的声表面波谐振器无源无线传感虚拟仪器系统。该系统通过设计虚拟仪器实现部分硬件功能,控制闭环系统实现自动检测,并采用数字信号处理方法提高检测系统的精度,从而避免了通常的复杂硬件系统,降低硬件成本,并使检测更灵活。本文介绍了设计原理和系统构成,并对系统的误差进行了分析。实验表明:该仪器系统能够达到5m的无线检测距离。     

Influences of the dynamic strain aging on the J–R fracture characteristics of the ferritic steels for reactor coolant piping system

The leak-before-break (LBB) design of the piping system for nuclear power plants has been based on the premise that the leakage due to the through-wall crack can be detected by using leak detection systems before a catastrophic break. The piping materials are required to have excellent J–R fracture characteristics. However, where ferritic steels for reactor coolant piping systems operate at the temperatures where dynamic strain aging (DSA) could occur, the fracture resistance could be reduced with the influence of DSA under dynamic loading. Therefore, in order to apply the LBB design concept to the piping system under seismic loading, both static and dynamic J–R characteristics must be evaluated.Materials used in this study are SA516 Gr.70 for the elbow pipe and SA508 Cl.1a for the main pipe and their welding joints. The crack extension during the dynamic and the static J–R tests was measured by the direct current potential drop (DCPD) and the compliance method, respectively. This paper describes the influences of the dynamic strain aging on the J–R fracture characteristics with the loading rate of the pipe materials and their welding joints.     

A distributed deadlock detection algorithm for mobile computing system

The mode of mobile computing originated from distributed computing and it has the un-idempotent operation property, therefore the deadlock detection algorithm designed for mobile computing systems will face challenges with regard to correctness and high efficiency. This paper attempts a fundamental study of deadlock detection for the AND model of mobile computing systems. First, the existing deadlock detection algorithms for distributed systems are classified into the resource node dependent （ RD ） and the resource node independent （RI） categories, and their corresponding weaknesses are discussed. Afterwards a new RI algorithm based on the AND model of mobile computing system is presented. The novelties of our algorithm are that： 1 ） the blocked nodes inform their predecessors and successors simultaneously; 2） the detection messages （agents） hold the predecessors information of their originator; 3 ） no agent is stored midway. Additionally, the quit-inform scheme is introduced to treat the excessive victim quitting problem raised by the overlapped cycles. By these methods the proposed algorithm can detect a cycle of size n within n - 2 steps and with （ n^2- n - 2 ）/2 agents. The performance of our algorithm is compared with the most competitive RD and RI algorithms for distributed systems on a mobile agent simulation platform. Experiment results point out that our algorithm outperforms the two algorithms under the vast majority of resource configurations and concurrent workloads. The correctness of the proposed algorithm is formally proven by the invariant verification technique.     

EXPERIMENTAL STUDIES OF NEW TECHNOLOGY ON HIGH GLOSSINESS GRANITE SURFACE

On the basis of analysing thecharacter of granite and its polishingtechnology,the authors have manufactureda kind of polishing disk to polish graniteand good results have been obtained.Through studying the polishing process ofgranite in theory and experiment,theauthors think that the high glossinesssurface is the result of grinding ofabrasives and adhering of soft metal.Moreover,orthogonal test is carried outabout the technical parameters for threeetypical kinds of granites and some usefulresults for production are obtained.     

基于遗传算法的0/1背包问题求解

利用遗传算法提出了解决０／１背包问题的３种算法,这３种算法分别是基于罚函数修正方法和译码方法的算法,理论分析表明,修正方法可以获得问题的最优解,在不同测试数据集上对这３处算法的性能进行了比较,结果与理论分析一致。     

大环麝香环十六内酯的合成

采用红外光谱分析法,详细研究了温度、催化剂等条件对环己酮与过氧化氢反应生成三聚环己酮过氧化物的影响。在10～35℃范围内,随着反应温度的增高,杂质(二聚环己酮过氧化物)的相对含量呈反S型曲线增加,产率在20℃左右呈现极大值,达89％。用化学分析法研究反应动力学,表明其为二级反应,反应活化能为5.78×10~4焦耳/摩尔。三聚环己酮过氧化物在国产高沸点溶剂中进行热分解,于175±5℃,反应1小时达平衡,环十六内酯产率达25％。