Experimental Study on the Energy Absorption Properties of MWK Reinforced Composites

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多轴向经编增强复合材料低速冲击下能量吸收特性的研究

从多轴向经编增强结构本身的特点出发，利用我们自己建立的一套落锤冲击试验装置，对玻璃纤维/DTY多轴向经编增强玻璃纤维/环氧树脂复合材料板进行了低速低能量的冲击试验研究。通过传感器技术及其相应的信号处理装置记录落锤冲击试验过程中速度随时间变化曲线，直接计算冲击动能和材料所吸收的冲击能量，通过数学处理得到各种冲击试样的能量吸收系数，对多轴向经编结构复合材料的冲击失效过程和影响能量吸收特性的因素进行试验研究和分析。     

A Geometric Model of Multiaxial Warp-knitted Preform for Composite Reinforcement

A new geometric model of Multiaxial Warp-Kintted(MWK) performe, which is based on theexperimental observations and analysis of basicstitch, is developed to relate the geometricparameters and process variables. The fiber volumefraction ed fibre orientation of MWK reinforced     

基于模糊控制思想的PD控制器及其应用

针对工业上广泛使用的温控仪的工作特点，研究了模糊控制的方法，主要包括：在分析总结模糊控制本质思想的基础上，提出了一种非线性、变权、控制规则自调整的模糊控制器，仿真结果验证了该控制器的简单、有效性；将该控制算法用于MWK型模糊温控仪的设计制造，实验表明，温控仪的工作性能良好、成本低、可以投入生产。分析了控制器参数的作用，并给出了进一步改善控制性能和在线自调整的模糊算法。     

浅议高校图书馆古籍的典藏与流通

中国线装古籍是先民生存斗争的历史记录,是人类智慧的结晶,是我国古代文化遗产的重要组成部分。阐述了线装古籍的发展和历史定位,介绍了线装古籍的典藏史和相关知识,探讨了高校图书馆线装古籍的管理保护和技术创新,提出了馆员要在实践中不断提高业务水平。     

一种工业绣花机平包针补偿的新方法

为了满足不同材质布料的刺绣需求,提高工业绣花机刺绣质量,提出一种平包针补偿的新方法.首先,在分析平包针特征的基础上,总结出平包针的必备条件,并建立链表保存满足条件的各平包针段;然后,根据平面几何原理,采取从一般到特殊的方式研究出平包针的补偿方案;最后在自主研发的基于ARM7的工业绣花机控制器上实现.测试结果表明,该方法对平包针的正、负补偿效果都很显著.     

弹性针织物缝纫线的选用

用涤棉线及ＰＢＴ改性涤纶制成的弹力线，采用二种缝迹缝制二种弹性针织面料，对形成的缝迹进行强力测试分析，得出使用中弹线或高弹线时断裂强度比用涤棉线有较大的提高．     

缝纫复合材料层合板面内性能的分析模型

提出了一种分析缝纫复合材料层合板面内力学性能的模型即纤维弯曲模型（FBM）。认为在缝纫孔周围纤维的弯曲变形是影响缝纫复合材料层合板面内力学性能的主要原因。从分析缝孔单胞的纤维弯曲几何特征入手，最终得到层合板面内的弹性应力应变关系。以缝纫复合材料层合板[0/45/0/-45/90/45/0/-45]2S为例，计算了缝纫复合材料层合板面内拉伸强度。计算结果表明，理论预测与实验结果吻合良好，证实了该模型的正确性。     

苎麻三维结构纬编针织复合材料预制件的研制

用苎麻和玻璃纤维设计、织造了米拉诺罗纹加衬纬和变化畦编加衬纬三维结构纬编针织复合材料预制件,并测试和分析了预制件的拉伸性能.结果发现米拉诺罗纹组织的织物强度和衬纬强度都比变化畦编组织高;苎麻纱线性能的一致性差,易发生非均匀断裂,不能充分发挥其性能优势.     

桥梁加宽中新旧桥面挠度差的控制

为减小桥梁加宽施工中交通荷载引起的新旧桥面间的挠度差,采用基于梁格的有限元数值计算方法,研究了交通管制、在新旧桥面间设置临时剪力架、在旧桥下设置临时支撑、分段浇注新旧桥面间的混凝土接缝这4种措施及其组合的应用情况。研究结果表明:通过采取适当的交通管制措施,如关闭与混凝土接缝毗邻车道,能较有效地降低新旧桥面间的变形差,但实际施工中,如果单纯采用该措施,则需要在接缝混凝土浇注后的6~8 h内完全封闭交通;在旧桥桥下设置临时支撑比在新旧桥面间设置临时剪力架更能有效地减小交通荷载作用下新旧桥面间的变形差,但该措施受到桥梁所处位置限制,且成本较高;分节段浇注混凝土接缝亦能减小交通荷载作用下新旧桥面间的变形差,但可能增加施工工期;在4种措施的组合应用方面,以适当的交通管制和在新旧桥面间设置临时剪力架的组合方式较为可行和有效。     

Compilation and Analysis Method for Computer Aided Pattern Design System Based on Fully-Fashioned Computerized Flat Knitting Machine

The knitting industry CAD/CAM system's development needs a solution of computer representation of the designed objects.One of them is a transformation of knitting rows and stitches form knitting pattern and its automatic analysis is to control data from the knitting design data.A method of the pattern CAD system including the analyzing and the compiling of the pattern data was developed in this paper.By rasterizing the pattern map,the drafted pattern could be compiled into knitting row data and stitches.The storage format of knitting rows data and stitches data could be defined by analyzing the motion of computerized fiat knitting machine.By reassembling the control data,it could be analyzed into the execute data of the controller in computerized flat knitting machine.This method mainly focused on the weak areas of multi-needle-bed technology and fully-fashioned knitting technology in inland and could be applied to most of control systems in the master-slave mode.The knitting row data and pattern row data in a " *.ptn" format file were integrated.Giving a corresponding analytic calculation process of control data and realizing independent development of the upper machine and the lower machine,the final knitting control data not only have low computation and transmission cost but also have fast transfer speeds.     

缝合三明治热防护结构热力耦合仿真分析

为了研究缝合三明治热防护结构应用于高超声速技术领域时的热力性能及内在机制,基于代表性体积单元模型建立了模拟热力联合载荷作用下响应的有限元仿真分析方法,分析了结构内部的温度和应力分布,以及随载荷历程的演化情况。研究结果表明：加热面温度为1 073 K时,缝合三明治热防护结构能够有效起到隔热作用;缝线作为“热通道”对隔热性能的削弱影响不明显,但不同组分间的热膨胀不匹配会引起应力集中;面板和夹芯界面处的拉应力以及夹芯内部较高的应力水平可能会导致结构损伤和失效。     

Study on the Technique of Double-faced Embroidery on Chinese Palace Fans

Double - faced iso - object embroidery is carried out byusing the uneven intercalated stitch crafts of the parallel- lines stitch as a main body, being accompanied by oth-er stitch crafts and miscellaneous stitches, done on thesame textile material. This paper deals with the flower -bird double - faced embroidery fan of the Qing Dynasty,from pattern design, stitching formation and techniqueof color arrangement, describes the possible way of mak-ing double - faced embroidery with iso - object effectboth in the front and in the back.     

针织毛衫不同组织缩水率的研究

针对不同织物组织编织的毛衫，经洗涤后的保形问题，用实验方法研究了相同原料、相同纵向密度、不同织物组织的针织毛衫的缩水率情况，在此基础上，分析了同一件毛衫上的不同部位采用不同组织编织时，洗涤后对穿着效果的影响，结果表明，不同的织物组织，经过第一、第二、第三次洗涤后，其缩水率不同，所以，在同一件衣服上采用不同的织物组织，将影响洗涤后的穿着效果，需在生产过程中加以考虑。     

Dynamics and mechanics of the microtubule plus end

An important function of microtubules is to move cellular structures such as chromosomes, mitotic spindles and other organelles around inside cells. This is achieved by attaching the ends of microtubules to cellular structures; as the microtubules grow and shrink, the structures are pushed or pulled around the cell. How do the ends of microtubules couple to cellular structures, and how does this coupling regulate the stability and distribution of the microtubules? It is now clear that there are at least three properties of a microtubule end: it has alternate structures; it has a biochemical transition defined by GTP hydrolysis; and it forms a distinct target for the binding of specific proteins. These different properties can be unified by thinking of the microtubule as a molecular machine, which switches between growing and shrinking modes. Each mode is associated with a specific end structure on which end-binding proteins can assemble to modulate dynamics and couple the dynamic properties of microtubules to the movement of cellular structures.     

SIPOS／Si结构的界面特性

采用红外吸收光谱分析了ＳＩＰＯＳ薄膜中Ｓｉ—Ｏ键的结构，对比了热退火、快速灯光退火对ＳＩＰＯＳ中Ｓｉ—Ｏ键结构的影响，并结合ＳＩＰＯＳ／Ｓｉ结构的Ｃ－Ｖ，Ｉ－Ｖ测试结果，对其界面特性进行了分析．     

Finishing Effect on Warmth Property of Cotton/Kapok Blended Knitted Fabric

Nowadays,more and more natural or functional fibers are being investigated due to their utilization in thermal underwear.Kapok fiber is one of the natural cellulosic fibers whose source is the kapok plant. It has hollow body and sealed tail,which exhibits desirable features required for functional textiles of this nature. In this study,cotton / kapok( 80 /20 by mass) blended yarn with two types of yarn size 18. 5 and 14. 8 tex,respectively are knitted into plain stitches. The fabrics are undergone with an optimal preparation plan according to orthogonal design. Then,after dyeing and softening,fabric properties including thermal and water-vapour resistances, wicking property, pilling behaviour, and surface morphology,are tested and scrutinized for their candidacy for thermal underwear. The results showed that cotton / kapok blended fabrics have good thermal resistance which is significantly higher than those of cotton / modal blended fabrics,and the same water vapour resistance compared with cotton / modal blended fabrics which are normally used as underwear. Cotton / modal blended knitted fabrics has better pilling grade than cotton / kapok blended fabrics. Meanwhile, the cotton / kapok blends fabrics have good wicking property. Collectively,it was concluded that cotton / kapok blended fabric was appropriate for thermal underwear. However,the main limitation of these fabrics is their pilling properties.     

气相爆轰波贯穿胞格变化研究

根据气相爆轰波胞格结构的规则特则特性建立一种以子单元分解胞格结构的新方法,根据该子单元的性质和斜冲击波关系,求解胞格结构中的三波点对撞问题,并推导贯穿胞格时,爆轰速度的相对波动幅度仅依赖于胞格几何形状的关系,然后,采用爆炸波衰减模型,计算气相爆轰波贯穿胞格时的衰减过程,计算结果与实验符合得较好。     

焙烧温度对TiO2薄膜的光催化氧化性能的影响

采用溶胶－凝胶法制备TiO2薄膜（玻片为载体），比较在不同的焙烧温度下制备的TiO2薄膜对有机物的光催化氧化性能，用D／XAX－1200全自动X射线衍射仪检测在不同的焙烤温度下制备的TiO2薄膜的晶型结构，计算其锐钛型和晶红石晶型所占比例，从而确定通过控制焙烧温度来控制各种不同比例的晶型结构，提出温度对TiO2薄膜对有机物的光催化氧化性能的影响机制。     

多孔金属材料的制备工艺及性能分析

多孔金属材料是一种性能优异的新型功能材料和结构材料,具有独特的结构和性能,在很多领域有着广泛的应用前景。本文概述了多孔金属材料的常用制备方法及其主要性能。