多喷嘴喷气织机的节气研究

在保证引纬顺利的前提下,降低喷气织机主、辅喷嘴的气耗是降低织机能耗的关键.文章详细分析了多喷嘴喷气织机气耗产生的位置和特点,提出了节气降耗的相关措施,包括合理确定主辅喷嘴的安装位置,优化两者喷射时间的配合等.     

纯棉特细高密织物的生产实践

为了在必佳乐喷气织机上生产出高质量特细高密缎条织物,通过在整经、浆纱、织造各工序配置合理的工艺参数,加强操作管理,使CJ 5.83/3.64 984/2834 315缎条织物的织造取得了成功,织机效率由50%提高到84.1%,疵点率由200%降至33.96%.     

节能型纺织企业空调设计思路探讨

结合目前的纺织节能形势要求,归纳了纺织空调设计过程中的主要节能设计思路:选用高效冷源和节能设备,合理确定车间环境标准及气流组织,强化空气热湿处理效果,采用热能转移技术,应用自动控制技术等.总结了主要节能设计思路中的有效节能方法、具体措施和节能效果.     

Analysis of zeotropic mixtures used in low-temperature solar Rankine cycles for power generation

This paper presents the analysis of low-temperature solar Rankine cycles for power generation using zeotropic mixtures. Three typical mass fractions 0.9/0.1 (Ma) 0.65/0.35 (Mb), 0.45/0.55 (Mc) of R245fa/R152a are chosen. In the proposed temperature range from 25 °C to 85 °C, the three zeotropic mixtures are investigated as the working fluids of the low-temperature solar Rankine cycle. Because there is an obvious temperature glide during phase change for zeotropic mixtures, an internal heat exchanger (IHE) is introduced to the Rankine cycle. Investigation shows that different from the pure fluids, among the proposed zeotropic mixtures, the isentropic working fluid Mb possesses the lowest Rankine cycle efficiency. For zeotropic mixtures a significant increase of thermal efficiencies can be gained when superheating is combined with IHE. It is also indicated that utilizing zeotropic mixtures can extend the range of choosing working fluids for low-temperature solar Rankine cycles.     

微藻太阳能电池的初步研究

采用自主研制的双室光电化学池,首次选用绿藻--亚心型扁藻作为光电化学池的阳极生物催化剂,进行了微藻太阳能电池初步研究.运用电流-时间(amperometric i-t)曲线测定方法,通过空白对比实验,证实研制的微藻太阳能电池具有光电转换功能,实现了光能-电能转换,同时证实了所研制的微藻太阳能电池的有效性.实验结果证明了利用微藻细胞光合作用进行光电转换的可行性,从而为新型生物太阳能电池研究开发奠定基础.     

基于高温工质R245fa的太阳能平板集热器集热过程动态模拟

提出了一种以R245fa为循环工质的气液分离双级太阳能集热系统.对第一级集热系统的集热过程进行了动态数值模拟.结果表明,系统的集热过程受太阳辐射强度的影响最大,受系统肩动温度的影响较小.当系统从环境温度启动达到工质蒸发状态时.减少循环工质的质量或增大集热面积均能有效地减少系统的运行时间,而增大系统集热面积是较佳方案.     

纺织器材及专件的发展

介绍了近20来年国产纺织器材与专件的发展、技术进步及与国外先进技术水平存在的差距,指出:应用新型针布可有效降低结杂,改善生条质量;国产钢领、钢丝圈在适应高速和使用寿命方面还存在差距;国产超高精度罗拉已达世界先进水平;四种加压型式的摇架,板簧加压摇架优势大,圈簧加压摇架仍有很大发展空间;胶辊、胶圈在纺纱质量和品种适应性上已接近国际先进水平,主要差距在使用寿命上;国内近年开发的双支撑平底高速锭子已能适应高速,但使用寿命仍有差距;高速纱管还有待开发;国外空捻技术又有新发展,接头处外观、强力与原纱一致,国产空捻器还有待开发;目前电子清纱器已智能化,除清疵外还能监控筒纱质量,并进行疵点分级,国内已有开发;电子储纬器国际上已向多色选纬发展,国内产品尚有差距;认为纺织机械和器材、专件的发展是相互促进的,缺一不可。     

两款网圈专利产品的特点和应用

为了提高网圈性能,替代进口,降低集聚纺成本,从网圈的功能着手总结了对传统网圈产品的认识。简明地介绍了两款专利网圈产品的特点及优点,指出NWQ66型网圈纬密大、经密小,寿命长;TWQ型网圈中间工作区经、纬密小,两边传动区经、纬密大,集聚效果好,耐磨,寿命长。并从理论方面为变密度网格圈的优化拓展了空间,为集聚纺关键部件的设计提供了一种手段。     

The effect of a scattering layer on the edge output of a luminescent solar concentrator

The effect of adding white scattering layers to the bottom side of luminescent solar concentrator waveguides is evaluated. It is determined that adding a rear scatterer separated from the waveguide by an air gap results in a large increase of energy output from the waveguides, and this enhancement persists over long (>30 cm) distances, although the magnitude of the enhancement decreases with distance. An attached scatterer resulted in the greatest improvement of light output for short (∼6 cm) distances, but actually reduced edge emissions over longer distances. We provide estimates for the relative contribution of dye-emitted light and scattered light to the total waveguide emission, as well as distinguishing between the contributions of direct and indirect scattering of light to the total output as a function of dye content of the waveguides.     

Improving light absorption in organic solar cells by plasmonic contribution

Plasmonic phenomenon inside the materials composing an organic solar cell based on a photoactive poly(2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylenevinylene):(6,6)-phenyl-C₆₁-butyric-acid-methyl ester (MEH-PPV:PCBM) bulk heterojunction is studied using Finite Difference Time Domain (FDTD) method calculations and the modeling results are compared with experimental results.Enhanced absorptance of light up to 50% is experimentally obtained in a 50-nm-thick blend layer including spin-coated silver nanospheres with a diameter of 40 nm. FDTD calculations based on the design of 2D-grating of nanoparticles confirm the high values of absorptance. Spatial distributions of electromagnetic field power density in the structures show confinement of the power at the interface or in the vicinity of the nanoparticles depending on the wavelength and on the preferential directions.