降低紧密纺色织物浆纱断头的几项措施

为了降低紧密纺色织品种的浆纱断头,提高产品质量,分析了该品种在浆纱过程中产生断头的原因,介绍了在操作方面应采取的措施及在工艺方面应注意的问题.通过适当加大干分绞区张力及前浆槽纱线的喂入张力、预烘张力,单独控制前浆槽的浆液粘度,确保回潮率满足工艺要求,有效解决了紧密纺色织品种浆纱断头问题,提高了织轴质量.     

PV system sizing using observed time series of solar radiation

Sizing represents an important part of photovoltaic system design. This paper describes a sizing procedure based on the observed time series of solar radiation. Using a simple geometrical construction, the sizing curve is determined as a superposition of contributions from individual climatic cycles of low daily solar radiation. Unlike the traditional methods based on loss-of-load probability, the reliability of supply enters in this method through the length of the time series of data used in the analysis. The method thus resembles techniques used in other branches of engineering where extreme values are considered as functions of certain recurrence intervals.     

大中型连杆锻件的切边、冲孔、校正工艺

在分析大中型连杆类锻件生产难点的基础上，提出了通过优化锻造工艺方案，设计了切边冲孔校正复合模。提高了带大孔的连杆类锻件的产品质量和生产效率。     

玄武岩纤维表面处理及其复合材料界面改性研究

为改善玄武岩纤维的织造性能及其复合材料的界面性能，本文采用表面偶联剂结合乳液型浆料上浆的方法对纤维进行表面处理，研究表明，采用乳液型浆料处理后，玄武岩纤维的织造性能得到显著改善，在上浆处理前对纤维进行表面偶联剂处理，可使玄武岩纤维／环氧复合材料的界面性能得到明显提高，从而实现了纤维织造性能与复合材料界面力学性能的共同改善。     

高压上浆工艺指标的定量定性研究

通过对高压上浆浆液含固率、压出加重率、压出回潮率、压浆力及浆液粘度等工艺指标的分析研究 ,提出了高压力、高浓度和低粘度各指标的量化标志和范围 ,分别分析了压力、浓度、粘度的影响因素 ,并给出了在一定条件下三种工艺指标相应的计算公式。     

氧化羟丙基淀粉浆料性能研究

探讨氧化羟丙基淀粉浆料性能。利用氧化和羟丙基化复合变性制备了氧化羟丙基淀粉浆料,测试了黏度、取代度及pH值等因素对氧化羟丙基淀粉浆料及浆纱性能的影响。结果表明:氧化羟丙基淀粉浆料具有高浓低黏浆料特性,其黏度热稳定性和成膜性良好;在一定范围内,随着氧化剂用量的增加,黏度逐渐下降,浆膜断裂强度和断裂伸长率降低,耐磨性增加;随着取代度的增加,浆液黏度热稳定性提高,浆膜断裂强度和断裂伸长率都增加,水溶速度加快,浆液黏附力增大;取代度达到0.3的氧化羟丙基淀粉表现出良好的浆膜性能、黏附性能及对纯棉纱良好的浆纱效果。认为:取代度为0.3的氧化羟丙基淀粉具有较好的上浆性能。     

基于模拟退火遗传算法的分散式风电选址定容

分散式电源的优化配置是智能电网发展的重要课题之一。对分散式电源进行合理的选址和定容对于配电网规划非常重要。以分散式风力发电为平台,考虑分散式风力发电机的接入对配电网网损及电压质量的影响,应用计及风力发电机的配电网潮流计算方法获得配电网的相关电气参数,并在此基础上以提高电压质量和网损最小为目标,将模拟退火遗传算法应用到寻优算法中。最后举一算例进行验证。     

不锈钢焊管外径尺寸精度影响因素分析

从焊管定径机机座刚度、定径设备制造精度,以及定径量、定径道次等因素人手,通过理论分析与仿真计算,得到定径设备与工艺等因素对不锈钢焊管外径尺寸精度影响的结果。分析认为,提高设备制造精度是提高不锈钢焊管外径尺寸精度的关键因素：增加定径量及定径道次是其必要手段。     

Influence of secondary source technologies and energy management strategies on Energy Storage System sizing for fuel cell electric vehicles

Fuel cell electric vehicles (FCEVs) have some limitation which make them less competitor to thermal ones and delay their commercialization. The most important problems as the range, the durability and the cost depend directly on the energy storage problematic issues. In this context, this work presents an optimal sizing methodology for an Energy Storage System (ESS) composed by a fuel cell and an assistant source to supply a lightweight vehicle with 700 km driving range. Firstly, a comparative study between single and hybrid source is carried out to show the benefits of hybridization according to the range in terms of weight, cost and fuel consumption. Moreover, in order to improve the hybrid source characteristics, three technologies of the secondary source are tested and evaluated to be chosen for hybridization with fuel cell system purposes. Furthermore, the influence of three Energy Management Strategies (EMSs) on ESS sizing is studied where an optimal strategy provides the most favorable dimensions of the hybrid system. Simulation results give us the best technology needed for hybridization and allow us adopting the optimal management strategy to design the hybrid source. Finally, in order to show the influence of the driving cycles on the ESS design, a comparison study using the New European Driving Cycle “NEDC” and the Assessment and Reliability of Transport Emission Models Inventory Systems (ARTEMIS) confirms that there is a slow influence of the driving cycle on the ESS sizes.     

新型阳离子松香胶应用实践

新型阳离子松香胶具有良好的施胶效果,同时具有良好的增强和助留助滤效果。选择合适的添加地点,控制适当的添加条件对施胶效果影响较大。在满足施胶要求的前提下,施胶成本降低40元/吨纸,纸张的耐折度提高41.2%,纸张灰分含量提高1.3%～1.9%。