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…     

Orthogonally linear polarized lasers(Ⅰ)--principle and devices

Two kinds of orthogonally polarized lasers, i.e. Zeeman dual-frequency lasers and four-frequency ring lasers (laser gyros) have been developed since the invention of lasers, in which circularly polarized lights oscillate. This paper summarizes recent progress of the study on orthogonally linear polarized lasers with the standing wave cavity. Firstly, the expression of producing orthogonally linear polarized lights in standing wave cavity, i.e. laser frequency splitting, is given. Almost all the birefringence effects made in laser cavity are used to produce orthogonally linear polarized lights. The effect includes quartz crystal birefringence effect, calcite birefringence effect,stress (photo-elastic) birefringence effect and electro-optical birefringence effect. Secondly, several physical phenomena of orthogonally linear polarized lasers are discovered such as aberrance of frequency splitting curves caused by optical activity of quartz crystal, order-passing of longitudinal modes with frequency splitting and strong modes competition. Finally, because the traditional Zeeman dual frequency laser cannot output frequency difference larger than 3 MHz, the approaches of obtaining larger frequency difference are studied. The sequential results, several kinds of orthogonally polarized lasers, are described, such as birefringence dual frequency lasers outputting a frequency difference from 40 MHz to hundreds of megahertz, birefringence-Zeeman dual frequency lasers outputting a frequency difference from 1 MHz to hundreds of megahertz, the LD pumped YAG birefringence dual frequency laser outputting frequency difference of several gigahertz, and the lasers whose longitudinal mode spacing is c/4L instead of c/2L.     

巩固扩大先进性教育活动成果为率先发展提供强有力的科技支撑

按照太原市委统一部署，太原市科技局保持共产党员先进性教育活动在局党组的正确领导下和市委督导组的有力指导下。经过局系统各支部和广大党员的共同努力，圆满完成了三个阶段的各项任务．实现了中央提出的“提高党员素质、服务人民群众、促进各项工作”的目标。下面就如何巩固和扩大先进性教育活动的成果，建立健全先进性教育长效机制讲几点意见。     

地震参数综合处理方法在储层横向预测中的应用

建立了一套计算机上可实现的地震参数综合研究的算法和程序,将地震参数综合处理方法变为计算机处理过程,再将地球物理数据转换为地质解释语言.从现有的模式识别或统计分析方法中,选用了输出能量最大准则滤波的综合参数法和标准样本学习的判别分析法进行储层岩性预测.尽管综合参数或判别函数本身已失去了各个参数原有的明确的物理意义,但它却代表了多参数共同性的变化,较可靠地反映出产生这些变化的地质因素.     

用聚砜超滤膜处理含油污水的实验研究

主要研究了处理含油污水用的聚砜超滤膜的分离、透过性能与制膜液配方(聚合物浓度、溶剂及添加剂的种类和配比)之间的关系.确定了最佳的制膜液配比.所制得的膜在操作压力为0.36MPa(绝)时,其纯水通量为750L/(m~2·h).处理含石油类36～100ppm的含油污水时透过液通量达130～355L/(m~2·h).透过液中含油量降至10ppm以下.透过液中的石油类、悬浮物及色度等都基本上达到国家排放标准及油田注水用标准.     

煤矿井下主排水设备的计算机辅助设计

本文阐述了煤矿井下排水设备的计算机辅助设计中选型程序的编制及绘图,介绍了程序的功能,若干技术问题的处理和绘图方法与要点.     

半导体单晶硅的离子束蚀刻实验研究

离子束蚀刻是一种有超精细加工能力的微细加工技术,广泛应用于微电子、光子技术、表面科学等领域。硅及其化合物常用来制作大规模集成电路,在其表面蚀刻出具有一定几何布图尺寸的沟槽。其深度、宽度、边壁倾角及槽底形状等直接影响器件的性能。     

典型结构减速箱轴结构设计CAD

本文提出了一种轴结构设计的知识表示方法，实现了轴的结构设计，并绘制出轴的结构图     

浅析血型与体操运动员的选材

本文通过与遗传密切有关的血型来探讨体操选材,为准确选拔体操运动员,提供一些理论依据.     

三氮烯类化合物作为酸碱指示剂的研究及应用

本文报道了三氮烯类化合物作为酸碱指示剂的研究及应用.以我们新近合成的此类试剂之一——2-氯一4一硝基苯基重氮氨基偶氮苯为研究主要对象,分别讨论了有无表面活性剂存在、以及不同类型表面活性剂存在下,试剂的离解常数及变色区域.在TritonX-100存在下,其试剂的pKa=9.25±0.01,变色区域为pH8.40(黄)～10.0(紫);在CTMAB存在下,pKa=7.35士0.03,变色区域pH6.85～7.90;在混合表面活性剂TritonX-100-CTMAB存在下,pKa=8.20±0.05,变色域pH7.45～9.00(黄～紫).特别是在阳离子表面活性剂存在下,滴定终点颜色变化十分敏锐清晰,是一种优于酚酞和甲基橙的指示剂.最后并对此类试剂与表面活性剂的相互作用作了简单探讨.