客户机／服务器系统缓冲区容量的Petri网分析

本文在详细分析客户机／服务器架构的基础上,采用随机Petri网方法对客户机／服务器体系进行建模,着重就模型的缓冲区性能给出了相应的GSPN性能计算方法,并结合实例进行定性分析。     

SYSNTHESIS AND CHARACTERIZATION OF A NEW COMPOUND K_6Ti_2Nb_(14)O_(42)IN K_2O-TiO_2-Nb_2O_5SYSTEM

A new compound K_6Ti_2Nb_(14)O_(42)was found inthe ternary system K_2O-TiO_2-Nb_2O_5.The compound was char-acterized and investigated by electron,probe,X-ray powderdiffraction and differential thermal analysis.The transpar-ent crystal of light yellow color in form of hexagon-thinplate can be grown by flux method.Further,its crystal struc-ture was determined by four-circle diffratometer K_6Ti_2Nb_(14)O_(42)crystallizes in he(?)(?)(?)onal system with unitcell parameters a=9.1106(5)×10~(-10)m·c=12.0136(9)×10~(-10)m,Z=l andspace.group P6_3/mcm(193).     

乙丙橡胶密封件耐老化防护涂层的试验研究

针对东南沿海地区橡胶密封材料老化现象进行表面防护试验研究,开发用于橡胶表面的橡胶耐老化涂层。为进一步提高涂层本身的耐老化性能、改进涂层的施工性能、减少对环境的污染,试验研究了一种水性橡胶耐老化涂料,测试了涂层橡胶密封件的耐湿热性、耐盐雾性,试验结果表明:涂敷防护涂膜的乙丙橡胶表面在湿热环境下300 h、盐雾试验196 h未发生明显变化,耐老化效果显著提高。     

Using Dynamic Optimization Technique to Study the Operation of Batch Reactors

How to apply the global optimization technique, simulated annealing, and to explore the operation of batch reactors is addressed in this study. Based on the operating purposes and the imposed constraints, the batch reactor operations are first formulated as two optimal control problems: the maximal yield (or conversion) problem and the minimal operating time problem. The problems are then converted into non‐linear programming problems by the concept of control vector parameterization. The converted problems are solved by the algorithm derived from simulated annealing to determine the optimal operating policy and the performance index. These results are useful in assessing design and operation of batch reactors. In this article, the CSTR model is used to demonstrate the convenience and robustness of the proposed algorithm. Two typical reaction models are used to discuss the operations based on the optimal solutions.     

五轴数控加工叶轮轮毂曲面刀位轨迹的规划

对整体叶轮轮毂面的刀位轨迹排布进行了研究.首先运用分层的思想和旋转法得到均布于等长叶片叶轮轮毂面上的刀位轨迹;并在其基础上采用区域划分法对交错叶片叶轮轮毂曲面的刀位进行规划,得到C1连续的刀位轨迹.     

使用燃煤添加剂降低锅炉大气污染物的排放

介绍了“蓝天”牌消烟缚硫剂消烟除尘及固硫的机理及该产品的实际使用效果和存在的不足之处。     

民营模具贸易公司和模具厂争夺海外订单的博弈

模具贸易公司和模具厂争夺海外订单。     

油酸钠对半水硫酸钙晶须的稳定化机理

采用SEM，FT-IR，XRD等测试方法分析了油酸钠稳定化处理前后半水硫酸钙晶须的表面形貌、表面基团、物相组成，在此基础上研究了油酸钠对半水硫酸钙晶须的稳定化机理。结果表明，油酸钠在半水硫酸钙晶须表面的吸附状态随其用量的不同而不同，油酸钠对半水硫酸钙晶须表面活性点钙离子的封闭作用、对晶须表面离子的阻溶作用以及对晶须表面性质的改变是油酸钠使半水硫酸钙晶须保持稳定的根本原因。     

Using Superimposed ASK label in a 10-Gb/s multihop all-optical label swapping system

A novel optical-label-swapping technique is proposed, experimentally verified, and theoretically analyzed in this paper. The technique superimposes a low-speed amplitude-shift-keying (ASK) label on top of a high-speed dc-balanced-line-coded ASK payload. A multihop long-distance transmission experiment using a recirculating loop has been successfully demonstrated, and an experimental record is set when compared with other optical-label-swapping techniques.