Fenton氧化法处理废水的机理及应用

阐述了Fenton试剂的氧化机理 ,分析了各项因素对氧化效果的影响。介绍了光 -Fenton法、电 -Fenton法及Fenton -混凝法在废水处理中应用情况以及存在的问题 ,并展望了其发展趋势。     

Oxidative stability of soybean oil fatty acid methyl esters by oil stability index (OSI)

Biodiesel, an alternative diesel fuel derived from transesterification of vegetable oils or animal fats, is composed of saturated and unsaturated long-chain FA alkyl esters. During long-term storage, oxidation caused by contact with air (autoxidation) presents a legitimate concern with respect to monitoring and maintaining fuel quality. Extensive oxidative degradation may compromise quality by adversely affecting kinematic viscosity, acid value, or PV. This work examines the oil stability index (OSI) as a parameter for monitoring the oxidative stability of soybean oil FAME (SME). SME samples from five separate sources and with varying storage and handling histories were analyzed for OSI at 60°C using an oxidative stability instrument. Results showed that OSI may be used to measure relative oxidative stability of SME samples as well as to differentiate between samples from different producers. Although addition of α-tocopherol or TBHQ increased OSI, responses to these antioxidants varied with respect to SME sample. Variations in response to added antioxidant were attributed to aging and other effects that may have caused oxidative degradation in samples prior to acquisition for this study. Results showed that OSI was more sensitive than iodine value in detecting the effects of oxidative degradation in its early stages when monitoring SME during storage.     

二种双邻位甲基取代的聚芳醚酮类树脂的合成与性能

合成二种双邻位甲基取代的聚芳醚酮类聚合物,聚芳醚酮醚酮酮(DM-PEKEKK)和聚芳醚酮酮醚酮酮(DM-PEKKEKK),用FT-IR、1H NMR、DSC、WAXD、TG等技术对其进行表征,研究表明:较之于未取代的PEKEKK和PEKKEKK玻璃化转变温度和溶解性能大幅度提高,热分解温度有所下降,但均在450℃以上.     

Si3N4结合SiC窑具的研制及应用

本文根据试验确定了工艺路线,介绍了氯化烧成机理、原材料的选择及生产工艺对制品的影响,生产出的制品技术指标先进,性能优良。作为更新换代的新型窑具材料具有显著的经济效益和社会效益,有着广泛的使用价值。     

液态源雾化化学沉积法制备(Pb,La)TiO3薄膜

研究了在Pt/Ti/SiO2 /Si基片上用液态源雾化化学沉积法制备镧钛酸铅 [(Pb ,La)TiO3,PLT]薄膜的工艺 ,并分析了各种因素对其相结构的影响。采用金属有机物热分解工艺的先体溶液 ,在沉积阶段 ,用超声波将先体溶液雾化 ,产生微米级的汽雾 ,由载气 (Ar)引入沉积室进行沉积 ,并在沉积室进行预热处理。重复上述过程 ,直到膜厚达到要求 ,再进行退火处理得到均匀、致密的薄膜。此工艺各项参数如下 :沉积前沉积室内气压为 4× 10 - 3Pa ;沉积时沉积室内气压为 8× 10 3～ 9× 10 3Pa ,沉积时基片温度为 2 0～ 2 5℃ ;预处理温度为 30 0℃ ;最佳热处理温度为 60 0℃ ;超声雾化器工作频率为 1.7MHz;薄膜沉积速率为 3nm/min。XRD和SEM图分析说明 ,制备的铁电薄膜具有钙钛矿结构     

TR-96型地毯粘合剂合成与研究

介绍了自交联丙烯酸聚树脂乳液的合成方法，对该合成反应的投料比例，反应温度，反应时间等基本工艺作了分析和探讨。     

浆料系统内上升气泡周围微细颗粒浓度分布和附着效率的理论研究

Quantitative prediction of distribution function and adhesion efficiency of particles around a rising bubble in slurry systems is presented in this work. By solving the convection-diffusion equation (Fokker-Planck equation), the influence of Brownian diffusivity of fine particles on concentration distribution and adhesion efficiency is demonstrated with the hydrodynamic force and van der Waals attractive potential between particles and bubble considered. It is found that two kinds of mechanism dominate the adhesion process of particles on bubble according to different Peclet number or size of particles and bubble, as well as other properties of the slurry systems. In addition, the viscosity ratio of bubble to the suspending fluid was found to have obvious influence on particle adhesion.     

河流水质评价综述

随着我国对水环境、水资源保护和供水安全的日益重视,河流水质评价的重要地位也逐渐凸显出来。该文从河流水质评价的研究背景入手,对国内外研究进展、国内外研究现状的比较、评价方法的简介和优缺点、权重的选取及分析、指标的权重折减等几方面进行了系统地述评。在此基础上,指出水质评价今后应优化的方向,除了定性定量评价水质之外,在评价方法上,应将各评价方法的优缺点进行整合,相互借鉴改进,使评价结果更合理;此外,在选择评价方法时,应选择与我国河流以及研究对象相适应的方法,切忌一味学习国外方式方法。     

Formation of Polymeric Lewis Acid–Lewis Base Complexes with Well-defined Organoboron Polymers

The binding of Lewis bases to organoboron polymeric Lewis acids has been studied and the parameters that determine the complexation equilibrium have been investigated, which include (i) the strength of the individual Lewis acids and Lewis bases, (ii) concentration, and (iii) temperature. While the strongly Lewis acidic borane polymers poly(4-bis(pentafluorophenyl)borylstyrene) (PS-BPf) and poly(4-(di-2-thienylboryl)styrene) (PS-BTh) form isolable complexes with strong Lewis bases such as 4-t-butylpyridine (^tPy), a temperature dependent equilibrium is established with weaker bases such as THF. Similarly, the weakly Lewis acidic boronate polymer poly(4-diethoxyborylstyrene) (PS-BOEt) undergoes a temperature dependent equilibrium with the strong Lewis base 4-dimethylaminopyridine (DMAP), while poly(4-pinacolatoborylstyrene) (PS-BPin) does not significantly bind to pyridine bases. Decomplexation of PS-BTh· ^t Py is achieved by treatment with the stronger Lewis acid, B(C₆F₅)₃, thereby confirming the reversible nature of the polymeric Lewis acid–base adducts. This paper is dedicated to Professor Ian Manners in gratitude of his guidance throughout the years and recognition of his scientific accomplishments     

Robust consensus algorithm for multi-agent systems with exogenous disturbances under convergence conditions

In this paper, a robust consensus algorithm is developed and sufficient conditions for convergence to consensus are proposed for a multi-agent system (MAS) with exogenous disturbances subject to partial information. By utilizing H_∞ robust control, differential game theory and a design-based approach, the consensus problem of the MAS with exogenous bounded interference is resolved and the disturbances are restrained, simultaneously. Attention is focused on designing an H_∞ robust controller (the robust consensus algorithm) based on minimisation of our proposed rational and individual cost functions according to goals of the MAS. Furthermore, sufficient conditions for convergence of the robust consensus algorithm are given. An example is employed to demonstrate that our results are effective and more capable to restrain exogenous disturbances than the existing literature.