废热锅炉盘管的非正常损伤

By using optical microstructure(OM), X-ray diffractometer analyses and mechanical properties testing, the abnormal damage of pipe coil in remaining heat boiler has been investigated. The damage is the result of the melting of tube base metal at high temperature caused by the ignition inside the tube.     

示波器及电视机常见故障排除

主要介绍了示波器和电视机的相关电路的原理、故障排除,探讨了它们的相同与区别,列举了部分电路的常见故障及可能故障部位,以期对示波器的故障排除有一定的帮助.     

具有灾难到达的M/G/1可修重试排队系统

研究了一个具有灾难到达和重试顾客的M/G/1排队系统,服务台可能出现两种故障状态。灾难的到达服从Poisson过程,灾难到达时,系统中所有顾客立刻被清除,并引起服务台故障;由于服务台寿命有限,服务台在工作时也可能现现正常故障。应用补充变量法,得到了模型的稳态排队指标和可靠性指标。     

On the single server retrial queue with priority subscribers and server breakdowns

The author concerned the reliability evaluation as well as queueing analysis of M1, M2/G1, G2/1 retrial queues with two different types of primary customers arriving according to independent Poisson flows. In the case of blocking, the first type of customers can be queued whereas the second type of customers must leave the service area but return after some random period of time to try their luck again. The author assumes that the server is unreliable and it has a service-type dependent, exponentially distributed life time as well as a service-type dependent, generally distributed repair time. The necessary and sufficient condition for the system to be stable is investigated. Using a supplementary variable method, the author obtains a steady-state solution for queueing measures, and the transient as well as the steady-state solutions for reliability measures of interest.     

目标函数为完成时间方差的随机单机调度问题

本文讨论了工件加工时间随机且机器随机故障的单机调度问题,目的是确定工件的一个排序使得工件完成时间的加权方差的期望最小．在假定与机器随机故障相关的计数过程N（t）为广义泊松过程时,给出该随机问题等价的确定形式,并在假定工件的加工时间独立且具有相同的期望和方差时,给出了问题的最优解。     

A single server retrial queue with general retrial times and two-phase service

An M / G / 1 retrial queue with a first-come-first-served (FCFS) orbit, general retrial time, two-phase service and server breakdown is investigated in this paper. Customers are allowed to balk and renege at particular times. Assume that the customers who find the server busy are queued in the orbit in accordance with an FCFS discipline. All customers demand the first “essential” service, whereas only some of them demand the second “optional” service, and the second service is multioptional. During the service, the server is subject to breakdown and repair. Assume that the retrial time, the service time, and the repair time of the server are all arbitrarily distributed. By using the supplementary variables method, the authors obtain the steady-state solutions for both queueing and reliability measures of interest. This research is supported by the National Natural Science Foundation of China under Grant No. 10871020.     

多项式可解的单机加权E/T调度问题

研究了目标函数为完成时间与交货期差平方的加权和的单机调度问题，在工件的权值与加工时间成比例时，给出了问题的最优解．然后，在假设描述机器随机故障次数的计数过程为广义泊松过程时，将上述结果推广到机器有随机故障的情形．     

Reliability analysis of M/G/1 queues with general retrial times and server breakdowns

This paper concerns the reliability issues as well as queueing analysis of M/G/1 retrial queues with general retrial times and server subject to breakdowns and repairs. We assume that the server is unreliable and customers who find the server busy or down are queued in the retrial orbit in accordance with a first-come-first-served discipline. Only the customer at the head of the orbit queue is allowed for access to the server. The necessary and sufficient condition for the system to be stable is given. Using a supplementary variable method, we obtain the Laplace-Stieltjes transform of the reliability function of the server and a steady state solution for both queueing and reliability measures of interest. Some main reliability indexes, such as the availability, failure frequency, and the reliability function of the server, are obtained.     

具有二阶段服务的M^（[X]）/G/1可修排队系统

研究了成批到达的具有二阶段服务的单服务员可修排队系统。文章通过采用补充充变量法,得到了系统瞬态和稳态的排队指标和可靠性指标。     

机器随机故障时一类目标函数的单机调度问题

本文讨论了机器随机故障的情形下一类目标函数的调度问题 .首先在描述机器随机故障的计数过程为广义泊松过程时 ,给出了目标函数等价的确定形式 .然后针对 ( 1 )加工时间相同和 ( 2 )工件权值与加工时间成比例两种情形 ,指出了使目标函数最小的解的若干特征