Kinematic Modeling and Characteristic Analysis of Eccentric Conjugate Non- circular Gear ＆ Crank-Rocker ＆ Gears Train Weft Insertion Mechanism

A novel weft insertion mechanism named eccentric conjugate non-circular gear & crank-rocker & gears train weft insertion mechanism was proposed in order to better meet the requirements of rapier loom’s weft insertion mechanism as well as reduce the manufacturing difficulty. Meanwhile, based on the working principle of this mechanism, kinematical mathematic models of this mechanism were established and an aided analysis and simulation software was compiled. The influences of eccentricity ratio, deformation coefficient, and other important parameters on the kinematics characteristics of this mechanism were analyzed by using the software. A group of preferable parameters which could meet the requirements of weft insertion technology were obtained by means of human-computer interactive optimization method. The maximum velocity, maximum acceleration, and variation of acceleration of this mechanism are smaller than those of the conjugate cam weft insertion mechanism applied on TT96 rapier loom under the conditions of the same unilateral total stroke of rapier head and the same rotary speed of loom spindle; meanwhile the other demands of weaving technology can be met by this novel weft insertion mechanism.     

功能化玉米芯生物炭对水中磺胺甲恶唑的去除

采用玉米芯制备的生物炭对磺胺甲恶唑(SMZ)的吸附能力进行了研究.玉米芯经过预处理、活化、裂解及功能化处理,成功制备了功能化生物炭材料.采用SEM、FTIR、XRD技术对生物炭的形貌和理化性质进行了表征.吸附实验表明,利用磷酸活化、硝酸功能化的生物炭(PNBC)吸附效果最佳,其最大吸附量达162.08 mg/g,动力学...     

矿山动态轨道衡模拟判车问题的研究

本文针对动态轨道衡应用在矿山特殊环境情况,就矿山动态轨道衡模拟判车问题进行深入研究.分析了判车过程中存在的矿车上下衡、车辆往复以及车辆抖动问题,结合矿山轨道衡的实际,提出了具体的解决算法.该算法通过了实践的检验,证明了该算法的科学性、可行性,具有进一步的推广应用价值.     

Reverse Design and Test of Non-circular Gear ＆ Crank-Rocker ＆ Gear Trains Weft Insertion Mechanism

For the purpose of obtaining satisfactory performance of the non-circular gear & crank-rocker & gear trains (NCCRG) weft insertion mechanism which was proposed in this paper,the ideal kinematic curve of this weft insertion mechanism was given,and the reverse solution models of this mechanism were established.A reverse design and simulation software was compiled based on Visual Basic 6.0 to obtain the mechanism parameters,including the pitch curves and tooth profiles of the non-circular gears.A test-bed of this mechanism was developed according to these parameters.The kinematic performance of this weft insertion mechanism was tested by high-speed video tape recorder with its corresponding video analytical software Blaster's MAS.And the test results were identical with the theoretical calculation.Compared with the conjugate cam weft insertion mechanism which is applied on TT96 rapier loom,under the condition of same weft insertion rate,the variation of acceleration of this mechanism is smaller.This novel weft insertion mechanism can meet the requirements of weft insertion on rapier looms with smooth and steady motion.     

声化学应用研究进展综述

本文简述了声化学的基本原理，综述了声化学领域中的应用以及与之有关的有关的声化学反应器的研究进展情况，为研究声化学的科研人员提供有益的参考。     

员工冲突管理行为对工作满意度和创新绩效影响的实证研究

冲突管理不仅是企业管理者,也是企业员工需要掌握的一项重要工作技能.通过333份调查问卷,检验了员工冲突管理行为对工作满意度和创新绩效的影响.结果表明,倾向于采取合作和折衷型冲突管理行为的员工拥有更高工作满意度;合作型冲突管理行为与创新绩效正相关,而回避与创新绩效负相关.     

傅鹰化学教育思想初探

从5个方面探讨著名化学家傅鹰的化学教育思想,并指出其对当今化学教育的影响和作用,认为这对于拓宽视野、深化高等化学教育改革具有重要的理论价值和实践意义．     

拟环纹豹蛛求偶和交配行为的初步研究

以拟环纹豹蛛Pardosa pseudoannulata为研究对象,对其在室内求偶和交配行为进行了详细描述．雄蛛第1对步足水平前伸高频颤动及雄蛛触肢“划浆”式动作是其典型求偶行为．雄蛛触肢上黑白相间的毛丛在求偶中可能具重要作用．第1对步足水平前伸,同时身体平卧地面为雌蛛典型性接受行为．拟环纹豹蛛交配成功率为74．23％,完整交配一次雄蛛左右触肢器分别插入1次,基血囊膨大多次．交配前求偶潜伏时间、求偶持续时间和交配持续时间平均分别为31s、4min32S和26min49S．拟环纹豹蛛雄蛛可进行多次交配,而雌蛛单次交配．雌蛛具同类相食习性,交配前和交配后雌蛛同类相食率依次为9．28％和16．18％．     

北极研究，从梦想走向辉煌

走向南极和北极,是多少代中国人的两大梦想。1984年,中国第一次南极考察,将走向南极的梦想变成现实,并延续成长达28年的美丽画卷。然而,虽然北极距离中国更近,但走向北极的梦想实现起来要困难得多,北极科学考察的起步整整晚了11年。今天中国的北极研究与南极研究一样,正在走向辉煌。     

环状碳酸酯共聚改性聚乳酸性能

将5-甲基-5-苄氧羰基-三亚甲基碳酸酯(MBC)与左旋丙交酯(LLA)开环共聚制备了乳酸-功能化碳酸酯共聚物(P(LLA-MBC)),研究了共聚物的力学性能、体外降解性能及生物相容性。结果表明:与聚左旋丙交酯(PLLA)相比,共聚物的拉伸强度由原来的54.3 MPa(PLLA)下降到27.2 MPa(n(MBC)∶n(LLA)=34∶66),断裂伸长率由36%提高到350%,力学性能得到较好的平衡;共聚物结晶度有所下降,体外降解速率提高;材料的生物相容性未见明显改变。