聚羧酸系减水剂对水泥水化过程的影响

研究了以聚乙二醇800、丙烯酸、顺酐、烯丙基磺酸钠、丙烯酸羟乙酯为原料合成的聚羧酸系XYZ18减水剂对水泥水化过程及微观结构的影响.结果表明,XYZ系减水剂具有缓凝特性,能减少并延缓水泥水化放热;使水泥早期微小晶体大量生长并填充孔隙,气孔细化且分布更加合理,晶体向外伸长使水泥粒子相互搭接而形成网络结构,提高了水泥石的密实性.     

A preliminary study of wind–solar hybrid systems potential in Jammu and Kashmir

ABSTRACT

This paper deals with the study of wind–solar hybrid systems in the region of Jammu and Kashmir. Due to scarcity of less renewable energy resources in the J&K region, National Institute of Wind Energy, Chennai had installed different wind monitoring stations to measure the wind data at different locations. The survey reveals that four districts (LEH, KARGIL, POONCH and REASI) are suitable for small wind–solar hybrid systems. BIDDA (REASI) and CHUSHUL (LEH) are the two sites for small wind farm development due to the highest wind speed (more than 7?m/s) and power density (more than 400?W/m²) at 100?m agl.     

波长路由网络在城域网设计中的研究

波长路由网络(Wavelength Routing Network,WRN)是在WDM系统中,以光波长路由为基础,引入光波长交叉器和光分插复用器而建立的具有高度灵活性和生存性的光网络,是未来通信网络的主要发展方向之一,同时城域网是WRN网络的一个非常重要的应用.从用户的现有和未来的需求出发,提出了在城域网设计时必须注意的一些新的问题,指出WRN是城域网设计的一种合理的选择,通过对网络物理和逻辑拓扑结构的仔细研究,提出此次设计的最佳网络拓扑,同时选用一种新的路由选择和波长分配(WRA)技术,设计一个符合实际并对未来具有一定指导意义的城域网络.     

聚马来酸防皱整理剂的合成与应用

通过L9(34)正交试验,选择具有合适分子量的聚马来酸(PMA)无醛防皱整理剂和最优防皱整理工艺.并对棉织物进行防皱整理,获得良好的防皱整理效果,WRA值可达到243.5°,断裂强度保留率在70%以上.同时优选出合成PMA的最佳条件.     

高粱黑色素染色后棉织物性能测试与分析

以天然高粱黑色素上染棉织物,探讨了不同条件下染色对棉织物拉伸特性、剪切特性、弯曲特性、压缩特性及表面特性的影响,以及对折皱回复角及毛效的影响。结果表明:高粱色素染色可提高织物柔软性、弹性、活络性及抗形变能力,降低织物粗糙度,但同时丰满感、抗剪切变形能力、折皱回复角、毛效有所降低。     

Investigation on the novel measurement for fabric wrinkle simulating actual wear

It is very important to measure fabric wrinkling objectively and accurately. However, the most commonly used measurements could not be employed to realistically evaluate and predict how fabric will resist wrinkle when worn on human body. In our previous study, an equipment of measuring fabric wrinkling that can simulate actual wear was proposed. In this paper, we conduct further investigation on the measurement for fabric wrinkle-simulating actual wear, including improving the equipment, validating its repeatability, and clarifying its more accurate relationship with the wrinkle recovery angle (WRA) method. Results show that the measuring repeatability of the method is much better than WRA method and fabric wrinkling in the warp and bias direction plays more important part than weft. Therefore, it is advisable that WRA of the bias should be increased, whose measurement stability is the best in the WRA method as well. Equations of Wrinkle Density (WD) with WRAs are established, which can be used to estimate wrinkling of clothes after actual wear only by several WRAs of fabrics, avoiding the tedious clothes making and trial work.     

Ramie fibre: part I. Chemical composition and chemical properties. A critical review of recent developments

The monograph deals with a critical review of the recent research work and development on ramie, a long vegetable bast fibre. The review is divided into two parts. Part I discusses the progress of recent work on ramie, chemical components like fibre degumming, its effects on fibre composition, chemical constituents, i.e. hemicellulose, cellulose, non-cellulosic and mineral matters. Besides various chemical properties of native and modified fibres such as accessibility, infrared, cellulose I-V, DP, grafting, cross linking and resin finishing and dyeing etc. are dealt with.     

STANDARD SIZING AND FIT TESTING APPLIED TO WOMEN'S HOSIERY

The monograph deals with a critical review of the recent research work and development on ramie, a long vegetable bast fibre. The review is divided into two parts. Part I discusses the progress of recent work on ramie, chemical components like fibre degumming, its effects on fibre composition, chemical constituents, i.e. hemicellulose, cellulose, non-cellulosic and mineral matters. Besides various chemical properties of native and modified fibres such as accessibility, infrared, cellulose I–V, DP, grafting, cross linking and resin finishing and dyeing etc. are dealt with.     

聚马来酸酐抗皱整理工艺研究

研究了聚马来酸酐应用于棉织物的抗皱整理工艺.采用单因素实验考察了聚马来酸酐浓度、次亚磷酸钠浓度、焙烘温度以及焙烘时间对折皱回复角的影响,以L9(34)正交试验对其进行了优化.确定了最佳整理工艺条件:聚马来酸酐用量120 g·L-1、次亚磷酸钠用量30 g·L-1、焙烘温度170℃、焙烘时间7 min.     

钢渣微细粉在砼中的应用研究

利用粉磨至不同比表面积的转炉钢渣微细粉取代部分水泥进行了C40砼的3 d和28 d抗压强度及坍落度试验,考察了钢渣微细粉比表面积及掺入量、水胶比和减水剂掺入量对砼性能的影响,并用PoreMaster-60孔测定仪测定了硬化砼的孔分布。试验结果表明,钢渣微细粉比表面积为450 m2/kg、掺入量为15％～20％时,可获得令人满意的砼3 d和28 d抗压强度;随着水胶比的增大,砼3 d和28 d抗压强度显著降低,坍落度明显增大;减水剂掺入量对砼坍落度影响显著,但对砼强度影响不大。