A Dynamic Model of Sensibility Analysis in Project Evaluation

ＡＤｙｎａｍｉｃＭｏｄｅｌｏｆＳｅｎｓｉｂｉｌｉｔｙＡｎａｌｙｓｉｓｉｎＰｒｏｊｅｃｔＥｖａｌｕａｔｉｏｎＹＥＭｉｎｑｉａｎｇ（Ｄｅｐｔ．ｏｆＩ．Ｂ．Ｍ．，ＨｕａｑｉａｏＵｎｉｖｅｒｓｉｔｙ，Ｑｕａｎｚｈｏｕ，Ｆｕｊｉａｎ３６２０１１，Ｃｈｉｎａ）Ａ...     

Functional Organometallics

1 Results The lecture will address aspects of functional organometallics related to the development of novel organometallic materials.In chromium complexes of fused arenes-regio-and diastereoselectively accessible by chromium-templated benzannulation of arylcarbenes by alkynes[1]-a haptotropic migration of the chromium fragment along the π-face of fused arenes is controlled by both thermodynamics and the substitution pattern of the arene and the metal coligand sphere,and can be applied towards an organometallic switch[2].See Fig.1.     

Exponential Stability of Interval Time-Varying Dynamical System with Multidelay

1 .ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｓｔａｂｉｌｉｔｙｏｆｔｈｅｉｎｔｅｒｖａｌｍａｔｒｉｘａｎｄｕｎｃｅｒｔａｉｎｓｙｓｔｅｍｗｉｔｈｔｉｍｅｄｅｌａｙｈａｓｂｅｅｎａｃｏｎｓｉｄｅｒｅｄｂｙｒｅｓｅａｒｃｈｅｒｓｉｎｒｅｆｅｒｅｎｃｅｓ [1～ 1 3 ].Ｔｈｅｓｔａｂｉｌｉｔｙｏｆｔｈｅｆｏｌｌｏｗｉｎｇｉｎｔｅｒｖａｌｄｙｎａｍｉｃａｌｓｙｓｔｅｍｗｉｔｈｓｉｎｇｌｅｔｉｍｅｄｅｌａｙ ｘ(ｔ) =Ｎ[Ｐ ,Ｑ]ｘ(ｔ) +Ｎ[Ｃ ,Ｄ]ｘ(ｔ-τ)ｈａｓｂｅｅｎｃｏｎｓｉｄｅｒｅｄｉｎｐｒｅｖｉｏｕｓｒｅｆｅｒｅｎ…     

Radar Cross Section Calculation for Wing-Body Blended Targets

A new method of calculating the radai cross section (RCS) for wing-body blended targets is presented and verified. The method utilizes a computer program for modeling targets' geometry in terms of small pieces. The calculation is based on physical optics approximation. Examples are given to show the validity of the method.     

空难事件和飞机性能检测

很少有像航空工业那样更能引起公众注意的.因而,当阿洛哈公司的243次航班在被掀去机身上部18英尺的一块外壳,于1988年4月28日在毛伊迪卡哈卢机场紧急迫降时,全世界为之一震.当这架已飞行了19年的波音737飞机以每小时330哩的速度飞行在2万4千英尺的高空时,突然猛烈地在客舱上方掀开一块.由于机舱内急剧的减压,使得一名空中小姐被抛出机外,并有61名乘客受伤.     

PERSPECTIVES ON URBAN WATER INFRASTRUCTURE IN CHINA FOR THE 21~(ST) CENTURY: SDMUWEIC MODEL

Based on system dynamics approach, SDMUWEIC model is developed in order to evaluate future dynamics of urban water infrastructure development in China. Firstly, this paper presents the basic structure and characteristics of the model, focusing on water infrastructure's dynamic relationships with population increase, economic development, water resources shortage and water conservation practices. Secondly, model veracity and robustness tests based on behavior reproduction and uncertainty analyses are illustrated. Thirdly, based on the model, future patterns of China's urban water infrastructure investment requirements are simulated, and effectiveness of two different policy scenarios are evaluated. Finally, conclusions and policy implications are drawn, allowing insights into China's sustainable water infrastructure policies and managements.     

机动目标轨道的估算和预测

卡尔曼滤波器用于反飞机火炮控制是很适合的。在本文中,我们利用卡尔曼滤波器理论发展了一种精确的、在数字上有效的方法,以便估算和预测机动固定翼飞机现在和未来的位置。这个方法已在雷达跟踪器火炮控制系统中实现并对各种固定翼飞机目标做了实验。外场实验结果表明,采用这个方法能够得到很高的目标瞄准精度。     

数学与诗

茹可夫斯基说过,数学中有像诗画那样美丽的境界。那末让我们来看看数学家和诗人是怎样各自描述他们自己和他们所钟爱的事业的。下面这一组英文填充题,要填的不外乎。mathematics(数学)、mathematician(数学家)等,或poetry(诗)、poem(诗)、poet(诗人)。原句均是著名数学家和著名诗人的名言。可能你会从这些人名判断出相应句子的空格中应填上什么。但建议你不妨换一个试试看,句子的意思是不是还很顺当。这能不能说明数学与诗之间有某种相似性呢?(填充答案在本期中找。)     

C语言程序设计简明教程

C语言已赢得人们的广泛赞誉。有人称它是“具有高级数据结构的低级语言”,也有人称它是一种“既具有汇编语言的速度、又和BASIC同样易学的计算机语言”。它的表达能力很强,又足够有效,深受程序设计人员的欢迎;它的可移植性好,大大有利于成果的交流和推广,目前大、中、小、微各种规模的计算机及种类繁多的操作系统差不多都支持C语言。过去汇编语言一统天下独霸系统软件的地位已经从根本上发生了动摇。形形色色的应用软件也