一种六辊矫直机电气控制系统设计

根据六辊矫直机的工程实例,结合矫直机的控制工艺以及控制特点,介绍了六辊矫直机控制系统的设计方法以及自动控制系统的实现方法;使用西门子S7-300PLC进行自动控制,对西门子MM440变频器进行PROFIBUS组态,以及通过西门子DI模块对绝对值型脉冲编码器的数据进行读取;解决了矫直机设备的自动运行与矫直速度的实时监控,以及上下辊间距的精确测量的问题;实验结果表明,控制系统运行稳定,辊间距测量精确无误,增加了矫直控制的精确性和稳定性,实现棒料矫直的自动化生产。     

方波激励下纳米晶体铁心损耗模型建立与验证

为了实现电力机车小型化轻量化的发展要求,国内外专家考虑通过采用提高变压器的工作频率减小变压器整体的体积和质量。铁心作为高频变压器的关键部件,可以准确计算铁心损耗,对中高频变压器的设计和优化具有重要作用。针对高频变压器铁心通常是工作在方波或脉宽调制(PWM)波等非正弦激励下的特点,对传统Steinmetz损耗计算模型进行了优化改进,给出了考虑磁密的变化率及波形系数对损耗的影响的Steinmetz改进损耗模型。同时,为了提高损耗模型在不同特征频率下的通用性,进一步对损耗模型系数的非线性进行研究,给出了模型系数随频率变化的非线性函数。最后,利用有限元计算结果同实物测量结果进行比较,证明了所提损耗模型在方波激励下对纳米晶体铁心计算的准确性。     

多元羧酸与指甲醌染料交联染棉的结构及性能

为了提高天然染料对棉纤维的染色固色性能,以聚马来酸（PMA）和柠檬酸（CA）为交联剂应用于天然染料指甲醌对棉织物的交联染色。采用FTIR、SEM和XRD分析了染色前后棉织物的表面形态及结构,探讨了酯交联对棉织物性能的影响以及多元羧酸复配交联染色机理。结果表明,染色前后棉织物表面差别不大,各纤维间不粘连;直接染色后的棉纤维表面变化不明显,仅有少量染料附着,而交联染色后的棉纤维表面负载较多的染料导致其粗糙度增加,酯化反应主要发生在纤维的非晶态区。与直接染色棉织物相比,交联染色棉织物的染色深度（K/S）和上染率分别提高了88%和38%;染品的绿光、黄光增加,颜色饱和度提高;摩擦色牢度提高了1~2级;耐洗色牢度提高了1~2级;交联染色后棉织物的折皱回复角（WRA）提高了约60%,UPF值达到了50+,具有优异的抗紫外性能。     

细菌纤维素的功能化改性研究进展

细菌纤维素(BC)是微生物生长过程中产生的以葡萄糖为基本骨架的结构性碳水化合物,具有高纯度、高聚合度、高结晶度、高持水性、高抗张强度和良好的机械强度,在功能材料领域显示了巨大的应用潜力.综述了近年来BC合成菌种筛选的研究现状;分析了BC在透气、吸湿排汗、力学性能和染色与脱色性能调控方面的进展情况;重点总结了BC基材料在抗菌、防紫外线、防辐射、防静电、拒水拒油、导电和传感等功能化改性方面的研究进展;最后,指出BC大规模高效成模和成型技术、差异化高功能BC材料制备技术是未来的重点研发方向.     

A dual-stimuli-responsive intelligent layered lanthanide hydroxide for application in information security and latent fingerprint identification

With the rapid changes in the field of information, the research and development of optical storage materials with high security and large storage capacity are particularly important in the development of contemporary society. However, conventional memory materials with static fluorescent outputs have the disadvantages of easy simulation and forgery, which limits their practical application in the protection of confidential information. In this research, a dual-stimuli-responsive intelligent fluorescent material based on Tb³⁺ and Eu³⁺ ions doped layered lanthanide hydroxide (LYH:Eu_xTb_1–xDPA) was fabricated, which can realize reversible multi-color luminescence conversion (from green to red) by varying the pH and temperature. Combined with the Morse code and security pattern, the multiple encryption and decryption of confidential information and anti-counterfeiting can also be realized. Therefore, the obtained intelligent fluorescent material has a great application prospect for information security. In addition, due to the excellent color tunability, the material can provide the possibility to obtain potential fingerprints with high contrast and no background interference on different color substrates. The unique dual-stimuli-responsive behavior of this material provides more ingenious design inspiration for the design of multi-color intelligent fluorescent devices.     

汽车变速箱同步性能试验台的研制

汽车变速器同步性能直接影响车辆操控性,其量化测试十分重要。文中对变速箱同步器在换档过程中的同步时间,同步的轴向位移,同步时的换档力变化等参数借助于传感器进行采集。各路传感器信号经过调理电路转变为模拟量,然后经高速并行A/D转换为数字信号,并由单片机通过RS232上传给上位机进行数据分析并作出各项参数的曲线,对变速箱的性能作出评估。     

Integrating Fuzzy C-Means and TOPSIS for performance evaluation: An application and comparative analysis

In this paper we introduce a multi-method multiple criteria approach for evaluating the performance of organizations. Performance analysis may include both strategic and operational performance, as well as financial and other less tangible factors. This paper introduces the use of Fuzzy C-Means and TOPSIS for organizational performance evaluation purposes. Using real company data and balanced scorecard accounting and performance dimensions the methodology is applied and evaluated. The predictive abilities of the technique from an organizational performance evaluation approach are evaluated using this data. One of the results from the illustrative application is that economic performance evaluation is not the best predictor of overall viability of some organizations, especially e-commerce based organizations.     

An intelligent negotiator agent design for bilateral contracts of electrical energy

In this paper, an intelligent agent (using the Fuzzy SARSA learning approach) is proposed to negotiate for bilateral contracts (BC) of electrical energy in Block Forward Markets (BFM or similar market environments). In the BFM energy markets, the buyers (or loads) and the sellers (or generators) submit their bids and offers on a daily basis. The loads and generators could employ intelligent software agents to trade energy in BC markets on their behalves. Since each agent attempts to choose the best bid/offer in the market, conflict of interests might happen. In this work, the trading of energy in BC markets is modeled and solved using Game Theory and Reinforcement Learning (RL) approaches. The Stackelberg equation concept is used for the match making among load and generator agents. Then to overcome the negotiation limited time problems (it is assumed that a limited time is given to each generator–load pairs to negotiate and make an agreement), a Fuzzy SARSA Learning (FSL) method is used. The fuzzy feature of FSL helps the agent cope with continuous characteristics of the environment and also prevents it from the curse of dimensionality. The performance of the FSL (compared to other well-known traditional negotiation techniques, such as time-dependent and imitative techniques) is illustrated through simulation studies. The case study simulation results show that the FSL based agent could achieve more profits compared to the agents using other reviewed techniques in the BC energy market.     

棉织物的纳米银多功能整理

以植物还原剂——金银花提取物和化学还原剂——丙三醇,分别还原硝酸银,制备了两种纳米银溶液。采用浸渍法将上述制备的纳米银溶液分别对棉织物进行功能整理。利用SEM、EDS、XRD、FTIR分析整理前后棉织物的外观形貌及结构,并探讨了整理后的棉织物的抗紫外性能、不同洗涤次数后其含银量、色差和抗菌性能的变化。结果表明,纳米银粒子主要通过范德华力吸附在棉织物纤维素的无定形区;与化学还原法相比,植物还原法制备的纳米银粒径减小了约15nm,植物还原法制备的纳米银溶液整理后的棉织物经过50次洗涤后,棉织物表面的纳米银吸附量及色差变化不大,且对大肠杆菌和金黄色葡萄球菌的抑菌率仍旧达到99%以上,具有优异的抗菌性及良好的耐洗涤性能。另外,植物还原法制备的纳米银溶液整理后的棉织物紫外线防护系数(UPF)值达到了36.82,具有较好的抗紫外性能。     

高岭土/聚甲基丙烯酸甲酯核壳结构复合粒子对聚丙烯动态机械性能的影响

采用乳液聚合方法,以高岭土为核,甲基丙烯酸甲酯(MMA)为壳制备了具有核壳结构的共聚物。将制得共聚物与聚丙烯共混,用动态机械分析仪测试其共混物的动态机械性能,得出共混体系中温度与内耗因子的关系,温度与储能模量的关系以及温度与损耗模量的关系,并对所得的参数进行对比分析。研究表明,该种核壳结构的共聚物粒子与聚丙烯有很好的相容性,可以提高聚丙烯材料的阻尼性能,且可降低聚丙烯材料的玻璃化温度从而改善聚丙烯的柔韧性。