纬编提花毛圈织物计算机辅助设计

为了能快速准确地设计纬编提花毛圈织物,本文利用二维矩阵对这类织物结构的数学模型进行描述,包括花型意匠图以及花型编织图,并讨论了其意匠信息向编织信息转换的相应算法。依据上述模型和理论,借助Visual C++开发环境,自主研发了一款专业纬编提花毛圈织物CAD系统,文中详细说明了实际的操作和使用方法。随着对其数学模型的不断优化,在不久的将来,我们可以进一步提高这类织物的快速设计。     

库思玛纤维/精梳棉赛络纺针织纱的开发

库思玛纤维是一种十字型截面、具有吸湿快干功能的涤纶纤维,用其制成的面料穿着挺刮,高雅华丽,色彩鲜艳,还具有吸湿快干的特点,被广泛应用于运动服装.但其质量比电阻大,易起静电,生产难度高,在开清棉前需进行特殊预处理;与精梳细绒棉混纺时采用条混工艺,严格控制混纺比;赛络纺产品在细纱工序要注意牵伸通道的两根须条必须平行,保证库思玛纤维与精梳细绒棉混纺针织纱质量的稳定.     

Computational fluid dynamic investigations of partial blockage detection by core-temperature monitoring system of a sodium cooled fast reactor

Thermal hydraulic studies have been carried out to understand temperature dilution suffered by core-temperature monitoring system of a sodium cooled fast reactor. The three-dimensional computational model is validated against experimental results of a water model. Jet mixing phenomenon as predicted by different turbulence models is compared and RNG k–? model is found to be better than other models. A comprehensive parametric study considering: (i) effects of construction/manufacturing tolerances on thermocouple positions with respect to subassembly positions, (ii) thermal/irradiation bowing of subassemblies, and (iii) changes in core power profile during reactor operation cycles has been carried out. The studies indicate the maximum possible dilution in fuel and blanket subassemblies to be 2.63 K and 46.84 K, respectively. Shifting of thermocouple positions radially outward by 20 mm with respect to subassembly centers leads to an overall improvement in accuracy of thermocouple readings. It is also seen that subassembly blockage that leads to 7% flow reduction in fuel subassembly and 12% flow reduction in blanket subassembly can be detected effectively by the core-temperature monitoring system.     

Transmutation-incineration potential of transuraniums discharged from PWR-UO2 spent fuel in modified PROMETHEUS fusion reactor

This study presents the potential of the burning and/or transmutation (B/T) of transuraniums (TRUs), discharged from the pressured water reactor PWR-UO₂ spent fuel, in the modified PROMETHEUS-H fusion reactor. Two different design shapes (Models A and B) were considered. The transmutation zone (TZ), which contains the mixture of TRU nuclides (10%), was located in the modified blankets. The volume fraction of Pu in the mixture is raised from 0 to 40% stepped by 10% to determine its effect on the B/T. The fuel spheres were cladded with SiC (5%) and cooled with high-pressured helium gas (85%) for nuclear heat transfer. The calculations were performed for an operation period (OP) of up to 10 years by 75% plant factor (η) under a neutron wall load (P) of 4.7 MW/m². The results bring out that: (1) the Model B transmutes the TRUs more rapidly than the Model A; (2) the effective half-lives decrease about 20 and 40% with the increase of Pu fraction in the cases of Models A and B, respectively; (3) the M values are quite high with respect to the M value of the original PROMETHEUS fusion reactor; (4) the blankets can produce substantial electricity in situ.     

Axial offset control of PWR nuclear reactor core using intelligent techniques

Improved load following capability is one of the main technical performances of advanced PWR (APWR). Controlling the nuclear reactor core during load following operation encounters some difficulties. These difficulties mainly arise from nuclear reactor core limitations in local power peaking, while the core is subject to large and sharp variation of local power density during transients. Axial offset (AO) is the parameter usually used to represent of core power peaking, in form of a practical parameter. This paper, proposes a new intelligent approach to AO control of PWR nuclear reactors core during load following operation. This method uses a neural network model of the core to predict the dynamic behavior of the core and a fuzzy critic based on the operator knowledge and experience for the purpose of decision-making during load following operations. Simulation results show that this method can use optimum control rod groups maneuver with variable overlapping and may improve the reactor load following capability.     

茜草染料的提取及其在羊毛织物上的染色性能研究

文章以茜草染料染毛织物为出发点,研究了茜草染液的提取方法以及染色工艺参数对其染色效果的影响.结果表明,发酵24 h后,采用酒精提取的茜草染液所染毛织物颜色更红更深;茜草提取液在100℃沸水中能稳定存在2 h,但其耐酸、碱稳定性较差;茜草染料染毛织物的优化工艺为:染液用量6 ml,染液用量与铝离子媒染剂比例1∶2,染色温度100℃,pH值4.5.     

玉米聚乳酸纤维针织产品的开发

介绍了玉米聚乳酸纤维的性能特点,并利用其与棉混纺的纱线经织造染整加工开发出玉米聚乳酸纤维针织产品,丰富了高档针织面料的品种。     

东华原型在针织服装中的应用初探

针对针织服装结构设计的特点和现状,运用东华原型的结构原理和技术应用方法,通过试样着装实验,进行比较分析,建立了针织服装基型,并阐述了其应用的方法．     

电脑横机编织三维全成形口罩结构建模与工艺实践

为探究用电脑横编机开发全成形针织产品的可能性,以针织三维全成形口罩为开发对象,进行结构建模与工艺实践。首先对人体面部尺寸进行测量,以此确定全成形口罩的二维纸样;然后结合全成形口罩规格尺寸进行工艺计算,以四针床电脑横编机和SDS-ONE APEX3系统为开发工具,分别建立针织三维全成形口罩的口罩主体、过滤垫片口袋开口、挂耳带部位的结构模型。结果表明:通过对口罩的规格设计并建立结构模型,同时结合工艺参数的调节并优化其生产技术,可实现兼具美观性与舒适性三维全成形口罩的快速生产,结合功能性原料可开发高附加值的口罩产品。