基于SIMULINK的弹丸自然破片运动模型仿真研究

为了研究实际空气中自然破片的运动规律,建立了直角坐标系下破片质心运动模型,并建立SIMULINK仿真模型对破片的运动微分方程组进行仿真求解,得到了破片的运动轨迹、飞行的水平距离、落地时的动能,以及破片随其初始飞行角度变化的规律.研究结果表明,基于SIMULINK对弹丸破片运动规律进行研究,可以获得直观、形象、准确的仿真...     

对四川盆地上三叠统沉积相的一些认识和思考

前人对四川盆地上三叠统的沉积相进行过很多研究,但迄今为止认识分歧仍然很大。为此,根据数十年的野外露头剖面及岩心观察,结合对岩石薄片鉴定、测井等资料的综合分析,反复思索,认为：①须一段为海湾中形成的海陆交互相沉积;②香二段、香四段、香六段砂岩在盆地中西部主要为三角洲前缘水进河床与河口砂坝至滨湖滩、坝沉积,夹香三段、香五段湖相砂泥;③四川盆地东部的整个上三叠统均为泛滥平原-三角洲平原辫状河道砂和河间湖沼沉积。特别指出,盆地中西部香二段、四段、六段中许多与湖泊有密切联系的正粒度韵律砂体应属水进型三角洲的水进河床充填砂微相,所谓“水下分流河道”一词实际上是与客观情况不太吻合的。     

再谈四川盆地上三叠统层序地层划分方案

川西坳陷上三叠统须家河组在与邻区香溪群的对比中,目前流行4种地层划分方案,一直以来,对这几种划分方案都存在着激烈的争论。为此,应用层序地层学观点,利用中石油与中石化两大集团的勘探成果,建立层序地层序列,利用野外露头、古生物、年代地层等资料,结合钻、测井层序地层分析与井震标定,提出须家河组与香溪群对比的最新方案,即：①川西-川中须五段对比香四、香五、香六段,须四段对比香三段,须三段对比香二段;②须二段、小塘子组与马鞍塘组向东逐层上超至无沉积,在坳陷西坡的北、中段,须六段遭剥蚀,至南段须三段侧变为香二段;③须二段、小塘子组与马鞍塘组侧变为海相香一段。分析认为,底界面T₅²是解决安县运动界面与层序地层方案分歧的关键。在安县运动底界面T₅²之上地震波由NE往SW前积,之下由SW往NE前积,坳陷中心在彭州鸭子河一带。由西往东须家河组与香溪群为T₄与T₆两条地震波组控制的楔形体,其内以转换面T₅²为界分别发育各向东、西变薄的楔形体。最后,论述了湖盆东进与南迁过程中沉积中心迁移、物源水系变迁,以及相带展布与勘探领域转换的证据。     

Getting to know each other—Artificial social intelligence for autonomous robots

This paper proposes a research direction to study the development of ‘artificial social intelligence’ of autonomous robots which should result in ‘individualized robot societies’. The approach is highly inspired by the ‘social intelligence hypothesis’, derived from the investigation of primate societies, suggesting that primate intelligence originally evolved to solve social problems and was only later extended to problems outside the social domain. We suggest that it might be a general principle in the evolution of intelligence, applicable to both natural and artificial systems. Arguments are presented why the investigation of social intelligence for artifacts is not only an interesting research issue for the study of biological principles, but may be a necessary prerequisite for those scenarios in which autonomous robots are integrated into human societies, interacting and communicating both with humans and with each other. As a starting point to study experimentally the development of robots' ‘social relationships’, the investigation of collection and use of body images by means of imitation is proposed. A specific experimental setup which we use to test the theoretical considerations is described. The paper outlines in what kind of applications and for what kind of robot group structures social intelligence might be advantageous.     

An empirical study of a CDC 844-41 disk subsystem

Three methods (seek overlap, seek arm scheduling, static file repositioning) for improvement of disk subsystem performance are reviewed. Detailed measured data are reported for seek time, probability of zero-length seek, latency, and transfer time, for a 12-spindle CDC 844-41 disk subsystem shared between two CDC Cyber 170/750 central processors. The probability of zero-length seeks is shown to be high, and the spindle queue lengths are observed to be low. The transfer time data are very different from the data published by others for IBM systems. A detailed simulation model of the measured system is shown to validate. This model is then used to demonstrate that seek arm scheduling is unlikely to produce much improvement, that static file repositioning can improve performance by about 20%, and that seek overlap can almost double the interactive capacity of the system measured.     

不同国家在现代建筑运动中的角色差异分析

代表现代建筑运动开端的工艺美术运动产生于英国,可是现代主义建筑运动却主要产生于欧洲另外三个国家——德国、苏联和荷兰。该文通过对当时的社会、历史、文化和技术等方面进行分析,探索现代建筑运动的先锋地位从英国转移到德国、苏联和荷兰的原因,从而总结出现代建筑运动和现代主义建筑运动在这四个国家产生与发展的差异。     

断块油藏油水运动特征分析

Q油藏为稠油油藏,进入高含水后期开发以后,部分区块层系注采系统不适应的矛盾越来越严重。针对高含水后期油水运动的主要特点,进行油水运动分析研究。其油水运动规律基本上有3种类型：边水、底水和注入水运动。分析结论为边水满足不了油藏开采的需要;生产过程中底水锥进特点比较明显;注水后油井普遍见效造成油层过早水淹。针对这种状况,采取补孔、防砂、卡堵水、转抽等措施,取得了良好效果,为同类油藏提供经验借鉴。     

多工位自动送料系统的送料机构设计与运动分析

介绍在普通压力机实现多工位自动化冲压的方法,提出研究两种行星式齿轮驱动的自动纵向送进机构和凸轮机构驱动的横向张合机构的送料原理,进行自动送料机构的运动分析,关键机构的设计计算,对设计大型多工位自动化送料系统有参考价值。     

WONDERLAND IS A SLOW PLACE

The author first examines the origin and development of the international Citta Slow movement, and points out that the growing Citta Slow movement in China can be understood as a New Ruralism Movement for urban residents and the vision of Citta Slow in China is a romantic ideal of the Beautiful Countryside. The article then argues that slowing cities which operate at a moderate speed can create more pleasant and livable environments through the smart use of space, an energy-saving development, and harmony between man and nature. Finally, in the critical period of Beautiful China Construction and the new stage of China’s urbanization, five principles are proposed for designers and developers to apply into planning and design of slowing cities.