聚氨酯弹性体的电致伸缩效应

电致伸缩是指在外电场作用下电介质所产生的与场强二次方成正比的应变。近年来对聚氨酯电致伸缩性能的研究发现，聚氨酯弹性体综合了压电聚合物与传统的锆钛酸铅(PZT)压电陶瓷片的优点，具有很好的应用前景，本文简单介绍了聚氨酯的电致伸缩效应。     

集散控制装置的实验功能开发

以一个模拟生产设备为监控对象,介绍了PCS型集散控制装置的硬件和软件组成,并开发了该装置的各种实验功能,可满足实验教学的要求。     

基于UNIFAC基团贡献法的计算机辅助分子设计

本文论述了一种基于UNIFAC基团贡献法的计算机辅助分子设计方法。该方法采用UNIFAC模型中的基团概念,借助计算机技术来设计合成分子。主要涉及基团的分类和表征、基团的预选和可行分子结构的合成,同时本文编制了相应的分子设计程序。     

涂覆式刺扎自密封轮胎涂层对轮胎性能的影响

研究涂覆式刺扎自密封轮胎涂层对轮胎室内高速和耐久性能、滚动阻力、噪声、均匀性、动平衡和静态气密性等相关性能的影响。结果表明：涂层对涂覆式刺扎自密封轮胎的室内高速性能、耐久性能、滚动阻力和均匀性影响不大;轮胎室内噪声有所增大,静不平衡量影响不一;在常温状态下,扎钉后能够较好地保持轮胎气密性,在低温状态下,扎钉后及时拔出,轮胎自密封性能较好,如钉子长时间停留在胎内,拔出后会出现不能自密封的现象。     

Design and optimization of an integrated process for the purification of propylene oxide and the separation of propylene glycol by-product

It is difficult to separate the methanol and hydrocarbons in the propylene oxide (PO) purification process due to their forming azeotrope. As for this, a novel PO separation process, in that the deionized water is employed as extractant and 1,2-propylene glycol (MPG) that is formed from the PO hydrolysis reaction is recovered, is presented in this work. The salient feature of this process is that both the non-catalyzed reactions of PO hydrolysis to form MPG and dipropylene glycol (DPG) are simultaneously considered and MPG by-product with high purity is obtained in virtue of the deionized water as reflux liquid and side take-off in MPG column. In addition, the ionic liquid (IL) extractant is screened through the conductor-like screening model for segment activity coefficient (COSMO-SAC) and the comparisons of separation efficiency between the IL and normal octane (nC₈) extractant for the separation of PO and 2-methylpentane are made. With the non-random two-liquid (NRTL) thermodynamic model, the simulation and optimization design for the full flow sheet are performed and the effects of the key operation parameters such as solvent ratio, theoretical stages, feeding stage etc. on separation efficiency are detailedly discussed. The results show that the mass purity and the mass yield of PO can be up to 99.99% and 99.0%, and the condenser duty, reboiler duty and PO loss in the process with IL extractant can be decreased by 69.66%, 30.21% and 78.86% compared to ones with nC₈. The total annual cost (TAC) calculation also suggests that the TAC would be significantly reduced if using IL in replace of nC₈ for the investigated process. The presented results would provide a useful guide for improving the quality of PO product and the economic efficiency of industrial plant.     

典型缺口试样应力集中系数的数值分析

采用有限元分析方法,对几种典型的缺口试样中缺口顶端的应力场进行了详细分析,求得了表征低碳钢冷脆特征温度(T_c~*)的重要参量—有效屈服区内边缘的第一主应力集中系数(简称有效应力集中系数)的最大值Q_(m(?)x)的数值解,为冷脆特征温度的确定奠定了理论基础.     

基于锚节点的无线传感网离群值检测算法

在无线传感网离群值检测算法中,如何自适应调整离群值检测算法的参数是一项重大挑战。由于节点之间存在相关性,不能孤立地去考虑单个传感器节点,因此根据其周围节点情况来动态设置节点参数很有必要。在文中提出一种基于锚节点的无线传感网离群值检测算法,该算法预先为锚节点设置最佳参数,同时计算锚节点与普通节点之间的相关性,利用大小根堆、滑动窗口与标准差来动态地调整每个普通节点的参数,并将其转换为锚节点。最终每个节点都能自适应地将参数调整为最佳。仿真实验表明：在自适应调整方式下,检测算法的真阳性率在84.3%以上,假阳性率在20%以下,并且能够将数据正确地分离出来。     

中微孔复合分子筛的合成研究开发进展

综述了复全分子筛合成的研究进展，介绍了原位合成法，离子交换法和纳米组装法。分析比较了各种合成方法的特点，讨论了方法的适用范围，指出复合分子筛的合成中存在的一些问题，认为合成具有大－中－小孔梯度分布的复合物和用硅铝纳米簇进行自组装合成中孔材料将是今后发展的主流。     

气相色谱法分析Ar+N2含量准确性的探讨

探讨了采用TDX-01碳分子气相色谱法分析高、低变出口气中Ar N2的含量时,高变出口气中Ar N2的含量比低变出口气中Ar N2的含量低的原因。采用峰高测量法代替峰面积测量法,可以消除数据处理机对色谱峰重叠处理时造成的偏差,测定值与实际值相符合,得到令人满意的结果。     

Preparation of molecularly imprinted fluorescence sensor based on carbon quantum dots via precipitation polymerization for fluorescence detection of tetracycline

A facile and effective method was proposed to prepare the molecularly imprinted fluorescence sensor with carbon quantum dots, which were modified vinyl groups by acrylic acid on the surface. The obtained fluorescence composite material was investigated by transmission electron microscope and Fourier transform infrared spectra. After the experimental conditions were optimized, a linear range of 1.0–60 μmol L⁻¹ was obtained and the detection limit was 0.17 μmol L⁻¹. The novel fluorescence sensor can be successfully used to detect tetracycline in real samples. This study provides a convenient strategy for selective recognition and rapid detection of tetracycline in the complex environment.