Design and implementation of 2DOF spherical inverted pendulum

1.INTRODUCTION Theinvertedpendulumsystemisaclassicalbench markfortheeducationandresearchintheautomation andmechanicalengineeringfield.Manyeducatorsfo cusontheinvertedpendulumcontrolsystembecause theexperimentsexhibittheadvantageandvalidityof moderncontroltheoryveryintuitively.Researchers alsohopetoverifynewalgorithmsonthesystem. Thebasicobjectiveoftheinverted pendulumsystem iskeepingthebalanceofthependulumatthe‘invert ed’status[1～3].Wehavecomparedtheperformance ofthreemoderncontrolm…     

无格式设计观

当 Kjell Ekhorn 还在学校学习图形设计,Jon Forss 已在这个行业里工作了不少年头。1989年 Jon Forss 于1LeicesterPolytechnic 毕业后就在 Bath 为一家广告代理商工作,四年之后他移居伦敦为 namara 设计公司设计图书封面。五年以后,他遇到从伦敦 Centrl St.Martins 学校毕业不过两年,正以自由职业者身份从事图书封面设计、图片制作和摄影工作的 Kjell Ekhorn。两人惊讶于互相对图书封面设计的看法,一时相见恨晚,然后自然而然的开始了两人合作的NON-FORMAT 时代。     

纵观中国的核力量

瑞典斯德哥尔摩国际和平研究所1986年出版的《世界军备与裁军》年鉴中,首次刊登一篇系统研究我国核政策的文章《纵观中国的核力量》,尽管文中真真假假,似是而非,并有多处歪曲我国核政策的论述,但它不失为外国人看中国的一篇有趣资料,现摘译发表,供读者鉴别、分析。     

全息胚针刺疗法对糖尿病的功效

临床中我已经运用张颖清教授创立的全息胚诊疗法广泛治病,其有效率达90％以上。现将运用全息生物学方法治疗糖尿病患者的情况报告如下。根据临床记录,只要病人所患疾病不是处于后期(根据其血糖含量),其有效率为95％。约半年后,同一病人回医院寻求其他方式的治疗,同时检查其血糖含量,发现他们体内保持了稳定而正常的血糖,病情没有恶化。采用全息生物诊疗法,经过平均两个月的一系列洽疗,即能生效。据我观察,血糖含量从320mg/dl下降到160mg/dl。经过四个月的继续治疗,病人体内的血糖含量能仍保持在120mg/dl至160mg/dl之     

PRELIMINARY STUDY ON RETRO-REFLECTIVE COATED PAPER BASED ON MICROGLASS BEADS

INTRODUCTIONThe micro-glass bead[1-2] is a new kind of silicate material, with good properties of chemical stability, mechanical strength as well as electro-resistance. When its diameter is below 0.08mm and the reflective index is in the range of 1.9~2.1, retro-reflective characteristics can be achieved. When a beam of ray from any direction irradiates the surface of the micro-glass beads, it can be converged at the special reflective layer consisted of focuses of micro-glass beads, owing …     

乙烷—丙烷混合裂解模型及产率预计

本文研究了乙烷和丙烷的混合裂解,并与乙烷、丙烷单独裂解进行了比较。解决了微分方程组的刚性问题,提出了混合裂解反应动力学模型。明确了三种选择性的概念,即;真实选择性、迭加选择性和总选择性,从而澄清了国际上对于选择性有正偏差和负偏差的不同观点。为乙烯生产提供了有效利用乙烷和丙烷的分析评价方法。     

A High Speed Detection Scheme for Point Targets in a Multitarget Environment

The purpose of this paper is to develop a high speed detection scheme for moving and / or stationary point targets in a multitarget environment as registered in an IR image sequence. An iterative approximate 3-D line searching algorithm based upon the geometric representation of lines (for non-maneuvering targets in space) in a 3-D space is derived. The convergency of the algorithm is proved. An analysis is performed of the theoretical detection performance of the algorithm. The statistical experiment results show high effectiveness and computational efficiency of the algorithm in the case of low SNR. The idea may be employed to satisfy the real-time processing requirement of an IR system.