用最小电离的质子刻度铅–闪烁光纤夹层电磁量能器

研究利用最小电离的质子和已知能量的电子来刻度铅–闪烁光纤夹层电磁量能器.对最小电离粒子输出响应进行光纤衰减修正后,利用最小电离质子的输出响应对量能器测量单元进行标定,然后对不同入射能量的电子事例进行能量重建,重建能量与入射能量有很好的线性关系.本文还对最小电离的质子与μ子对量能器测量单元的输出响应进行了比较,发现二者在误差范围内是一致的.     

感应耦合等离子刻蚀技术研究

依据感应耦合等离子体的刻蚀机理，对影响刻蚀的两个重要参数及先进的硅刻蚀技术进行了较深入的研究，并对影响刻蚀效果的参数进行了实验研究，刻蚀出了20μm深，2μm宽的谐振器结构，得到了最佳的工艺参数。     

一类非线性系统的稳定性及分岔分析

应用中心流形对一类含有二次和三次非线性项的Duffing系统降维,并数值模拟出其分岔图及Lyapunov指数图,对其进行分析,进一步研究其稳定性及分岔特性.     

Performance testing of a long-strip two-end readout multi-gap resistive plate chamber

Multi-gap Resistive Plate Chamber （MRPC） is a new generation of gas detector with good timing and spacial resolution, whose technique is widely applied in some recent high energy （nuclear） physics experiments. In this letter, we report a long-strip two-end readout MRPC and its test beam performance. The measurements show that the long-strip performs a transmission line characteristic and the impedance is independent of the length of strip. The MRPC module we developed is presented to gain a timing resolution of -80 ps and a spacial resolution of -6.4 mm. The possible application of the MRPC is also discussed.     

Fuzzy Economic Order Quantity Inventory Models Without Backordering

In economic order quantity models without backordering, both the stock cost of each unit quantity and the order cost of each cycle are characterized as independent fuzzy variables rather than fuzzy numbers as in previous studies. Based on an expected value criterion or a credibility criterion, a fuzzy expected value model and a fuzzy dependent chance programming (DCP) model are constructed. The purpose of the fuzzy expected value model is to find the optimal order quantity such that the fuzzy expected value of the total cost is minimal. The fuzzy DCP model is used to find the optimal order quantity for maximizing the credibility of an event such that the total cost in the planning periods does not exceed a certain budget level. Fuzzy simulations are designed to calculate the expected value of the fuzzy objective function and the credibility of each fuzzy event. A particle swarm optimization (PSO) algorithm based on a fuzzy simulation is designed, by integrating the fuzzy simulation and the PSO algorithm. Finally, a numerical example is given to illustrate the feasibility and validity of the proposed algorithm.     

铅-闪烁光纤夹层电磁量能器高能γ触发方案的研究

在电磁量能器探测高能γ射线的实验中,主要本底来源于高通量的宇宙线质子事例.为了有效排除质子本底,本文利用蒙特卡洛方法研究了γ事例在铅–闪烁光纤夹层电磁量能器中的触发方案,并且使用束流测试数据对判选条件进行检验.通过分析质子和γ事例在量能器中的能量沉积和纵向发展的特征,提出了一种有效的触发方法,使得质子的事例率被限制在1?0?0Hz以内,同时能量高于1?0GeV的γ事例获得了99%的触发效率.     

新会信息产业发展概况

《南方日报》2000年3月7日刊登了一篇题为《光子产业,二十一世纪最有前途的产业》的文章,介绍了朗讯公司与由广东省信息产业厅牵头,省信息中心、广州市信息中心等部门参与的建设以广州为中心的光子产业带(即光谷)的有关材料。这无疑是向我们发出了信号,时代已奏响了发展信息产业的最强音。而新会早在几年前也在省的统一部署下有了自己的信息产业。截至今天,新会市信息产业取得了一定的成绩。     

On the Ascending Subgraph Decompositions Problem

Inthispaper,weconsideronlysimpleundirectedgraphsandfollowBondyandMurtyl7]forterminologyandnotationnotdefinedhere.Y.Alaviandothershavegiventhedefinitionoftheascendingsubgraphdecomposionin[1].LetGbeagraphofqedgessatisfy(" 1)5q<(" ,).ThenGissaidtohavean...     

一类双自由度碰撞振动系统的颤振及擦边研究

研究了一类基本的双自由度碰撞振动系统的碰撞运动.运用理论推导的方法找到了其碰撞运动的颤振完成点及其颤振时间,针对该碰撞系统中颤振导致的碰撞问题,找到了一种有效的研究该碰撞系统中颤振现象的数值方法,并用数值仿真的方法研究了系统的动态响应及擦边现象,验证了理论推导的正确性.     

极大外平面图的关联色数

简要介绍了图的关联着色问题的起源、发展情况及目前已有的结论，对一类特殊的图——极大外平面图(△≠6)，给出了其关联色数．