Based on the discussion of the nonlinearity of the vibrator , the mathematic model of ultra - low - frequency vibrator is established . then , on the basis of the ziegler - nichols pid controller , pid control parameters are modified according to the control requirements of object , and the computer simulation is done . finally , low - frequency feedback system is built up , which solves the problem of high distortion of the output of vibrator under ultra - low frequency 从分析标准振动台在超低频时的非线性因素入手，建立了超低频标准振动台的数学模型；然后在zieglernichols法设计pid的基础上，根据控制对象的性能要求修正了pid参数，并作了仿真研究；最后设计出低频反馈系统，解决了振动台超低频失真度较大的问题。
Beijing jinhao is committed to providing high quality medical equipments and equipping solutions to medical professionals for more than ten years , so we have solid experience in all the lines we handle . currently we have built up a sound sales network all over china , including 33 offices , each of which has 3 - 6 salesmen , and 6 sub - dealers . more than 5000 hospitals are our clients , among which there are about 1000 first - class hospitals , each of which has more than 500 beds ; and about 4000 second - class hospitals , each of which has more than 250 beds 近年来，为填补国内医用设备缺少尖端产品的空白，我公司凭多年来在国内康复理疗市场的经验，与意大利著名的a - circle s . p . a .集团公司美国the hygenic corporation主要品牌为thera band系列产品意大利rimec s . r . l .公司上下肢cpm系统法国ecli公司专业的生物反馈系统制造商等联手，向国内推出其具国际先进水平的康复理疗仪器，同时建立康复设备信息网站www . e - med . cn 。
The measures include motivating the enthusiasm of all sectors , improving the science and efficiency of the budget , keeping accordance in budget and accounting , perfecting the supplementary budget examining system and establishing a rapid and effective budget management system 这些对策包括充分调动学校各方面积极性，确保收入预算的实现；提高预算的科学性和时效性；保持预算与会计核算、年终决算内容与口径一致；完善内部预算追加审核制度；建立畅通迅达的预算管理反馈系统等。
Commentaries are on the opposite of the courseware original purpose ; ( 6 ) , paying no enough attentions to students " non - intelligence aspects and so on . in order to achieve prospective teaching objectives , my research in this article has given some solutions to these problems . finally , combining with the development and design of the distance network courseware : the directing and producing of television material , the research mainly probed into some problems as following : ( 1 ) 在此基础上，分析了远程网络教学的优势及存在的主要问题： 1 、大多数课程只是书本搬家，换上了网页的形式而已： 2 、大多数课程的问题答疑是通过e - - mail的形式解决； 3 、大多数课程的反馈系统单一； 4 、大多数网络模拟实验的针对性不强； 5 、解说偏离其原有目的； 6 、学习者的非智力因素没有引起足够重视；等等。
This article draws lessons from the psychology area to inside the implicit learning result to inquiry concept , essence , characteristic , and the influence factor . . . etc . of the implicit learning , and in this foundation ascend to discuss implicit learning of the function to english . try to guide english network course designing in the implicit learning theories 本文借鉴心理学领域对内隐学习的研究成果,探讨了内隐学习的概念、本质、特征、影响因素等,并在此基础上论述内隐学习对英语学习的作用,试图以内隐学习的理论指导英语网程的设计,本文初步探讨了对学习目标、学习内容、学习资源、学习活动、评价与反馈系统等五个方面的设计构想。
The other way , theoretical analysis of weld tracking system with a leading sensor is stated , based on the analyzing of movement process of the tracking system , a loop control structure diagram is presented , the deuce vision feedback system is used and realized the repeated and automatic tracking in multiplayer seam and controlling of system of tracking and system of motion 同时就传感器超前检测式焊缝自动跟踪系统进行了深入的理论分析，在分析该系统跟踪过程运动关系的基础上，建立了系统的闭环控制关系图，并提出了其系统数学离散控制结构简化图。采用两点式视觉伺服反馈系统，实现机器人在多层多道焊接时的重复自动跟踪以及跟踪机构的控制和焊炬横向调节机构的控制，并使之协调联动，满足焊接过程的要求。
