基于动态BP网络的实验电炉温度控制系统

针对一类不允许出现超调的工艺参数，提出了采用动态BP网络对工艺参数进行控制，可以达到良好的效果。并以实验电炉为对象，用工控机对其炉温进行控制，结果表明，采用动态BP网络进行控制，可以无超调地无限逼近给定值，控制精度高，控制时间较短。因此可以认为，用动态BP网络对这一类工艺参数的控制是有效的。     

增塑剂DBP对VAE乳液粘度的影响

应广大VAE乳液用户要求 ,我们对增塑剂DBP对不同型号VAE乳液粘度影响作了研究 ,并经实验得出了增塑剂的添加阈值。或VAE乳液应用具有指导意义。     

白炭黑制备及其表面改性研究

考察了盐酸加料速率和偶联剂KH 5 5 0对沉淀法白炭黑的堆密度、DBP值、平均粒径和粒度分布的影响。XRD、FTIR分析表明 ,所得产品为典型非晶SiO2 ,TGA、DSC分析和理化性能分析表明 ,改性剂KH 5 5 0已有效地接枝到产品粒子表面。     

加压生物接触氧化处理丁（辛）酯废水

加压生物接触氧化工艺能够直接处理高效浓度的丁（辛）酯废水，缩短微生物的培养驯化时间，加快生化反应速度，提高ＣＯＤ去除率，当进水ＣＯＤ为１００００～１２０００ｍｇ／Ｌ，反应器的应力为３００ｋＰａ，（表压）保证溶解氧〉３ｎｇ／Ｌ时，ＣＯＤ体积负荷达１３．５ｇ／Ｌ．ｄ，ＣＯＤ去除率为９５．３％。     

酞酸二丁酯在铁(Ⅲ)-草酸盐配合物体系中的光降解

在铁(Ⅲ)-草酸盐配合物体系中考察pH值,铁(Ⅲ)／草酸盐(Fe(Ⅲ)／Ox)配比,酞酸二丁酯(DBP)初始浓度对DBP光降解的影响,结果表明pH=3．5和Fe(Ⅲ)／Ox配比为10．0／120．0μmol／L时具有较强的氧化能力,其光解反应符合表观一级反应动力学规律。并且利用气相色谱-质谱联机分析确定DBP光降解得中间产物,揭示DBP光降解的主要反应途径是OH自由基提取烷基上与羧基相连的α-H,生成醇(ROH),再分解成为酞酸和二醇,进一步氧化脱羧,直至矿化。     

臭氧灭菌机理及消毒副产物溴酸盐控制技术研究进展

臭氧消毒作为氯消毒的替代方法,在饮用水处理中被越来越多地应用.臭氧灭菌作用是通过生物化学氧化反应实现的,灭菌性能试验表明,臭氧几乎对所有细菌、病毒、真菌及原虫、卵囊都具有明显的灭活效果.但是含有溴离子的水臭氧化过程中形成的消毒副产物溴酸盐,被国际癌症研究机构定为2B级潜在致癌物.臭氧氧化过程中溴酸盐的生成有臭氧氧化和臭氧/氢氧自由基氧化两种途径,控制溴酸盐可以从控制其形成和生成后去除两个方面进行.降低pH、添加氨气、氯-氨工艺和优化臭氧化条件是控制溴酸盐形成的方法,溴酸盐生成后则可以利用物理、化学和生物方法去除.因此要实现臭氧、致病菌与溴酸盐三者的平衡需进一步探讨臭氧灭菌机理及溴酸盐控制方法.     

DOP与DBP对PVC糊树脂性能影响的比较

为指导利用PVC糊树脂制备不同制品时设计合理的配方,探讨了DOP与DBP两种常配合使用的增塑剂对PVC糊树脂性能的影响。实验结果表明,随着DOP、DBP用量的增加,制品的拉伸强度下降,断裂伸长率提高,当DOP／DBP配合体系配比为1：1时,制品的拉伸强度和断裂伸长率比较理想。DOP对硬度的影响大于DBP,DBP对撕裂强度的影响大于DOP,当DOP／DBP配合体系中DOP含量增加时,制品的硬度和撕裂强度提高。     

Performance improvement of DBP-based solar cells by introducing a luminescent sensitizer bis[(4,6-difluorophenyl)-pyridinato-N,C2']c(picolinate)iridium(III)(Flrpic)

In this work,a sky-blue luminescent down-shifting(LDS)layer bis[(4,6-difluorophenyl)-pyridinato-N,C^2']c(picolinate)iridium(II)(FIrpic)was inserted between tetraphenyl dibenzoperiflanthene(DBP)and Mo0₃as UV-screen and sensitizer for smallmolecule DBP/C₆₀based planar heterojunction(PHJ)solar cells.With 8-nm Flrpic theshort circuit current(J_sc)and power conversion efficiency(PCE)of the device areenhanced by 28%and 15%,respectively,probably originating from the re-absorption ofthe photons emitted from Flrpic.The V_oclinearly increases over 1-nm Flrpic,ascribed tothe deeper HOMO level of Flrpic than DBP,while the fill factor continuously declines from 3-to 10-nm Flrpic.The EQE spectra prove that the J_scis mainly contributed by thephotocurrent generated in DBP and C₆₀layers.When the FIrpic thickness is 8 nm,the filmsurface is very uniform with the smallest water contact angle.The impedance spectro-scopy demonstrates that the device resistance gradually increases from 4.1×10⁴Ω(without Flrpic)to 4.6×10⁴Ω(with 10-nm Flrpic)with the FIrpic thickness rise,simultaneously the device transits from the insulating state into the conductive statefaster for the thin Flrpic layer than the thick layer.     

The effects of UV disinfection on drinking water quality in distribution systems

UV treatment is a cost-effective disinfection process for drinking water, but concerned to have negative effects on water quality in distribution system by changed DOM structure. In the study, the authors evaluated the effects of UV disinfection on the water quality in the distribution system by investigating structure of DOM, concentration of AOC, chlorine demand and DBP formation before and after UV disinfection process. Although UV treatment did not affect concentration of AOC and characteristics of DOM (e.g., DOC, UV_254, SUVA₂₅₄, the ratio of hydrophilic/hydrophobic fractions, and distribution of molecular weight) significantly, the increase of low molecular fraction was observed after UV treatment, in dry season. Chlorine demand and THMFP are also increased with chlorination of UV treated water. This implies that UV irradiation can cleave DOM, but molecular weights of broken DOM are not low enough to be used directly by microorganisms in distribution system. Nonetheless, modification of DOM structure can affect water quality of distribution system as it can increase chlorine demands and DBPs formation by post-chlorination.     

Membrane bioreactor process for removing biodegradable organic matter from water

This research investigated a membrane bioreactor (MBR) process for removing biodegradable organic matter (BOM) and trihalomethane (THM) precursors from pre-ozonated water. Bench-scale and mini-pilot-scale MBR experiments were conducted using powdered activated carbon (PAC) and acclimated biomass. Dissolved organic carbon (DOC) was removed through a combination of adsorption and biodegradation mechanisms, and the initial DOC removals depended on carbon dose, while steady-state removals were in the 20-60 percent range under various operating conditions. Both assimilable organic carbon (AOC) and total aldehydes were mostly removed to near detection limits and were not affected by PAC dosage. The AOC(NOX) removals were significantly higher than AOC(P17) or total AOC removals probably because the MBR microbial consortium was closer in characteristics to Aquaspirillum NOX than to Pseudomonas fluorescens (P17). The DOC was used instead of biodegradable organic carbon (BDOC) as a parameter for evaluating disinfection byproduct formation and bacterial regrowth potentials because BDOC assays did not yield consistent and conclusive results due to analytical difficulties. The removals of THM precursors were high when PAC was added; however, steady-state removals were a function of operating conditions and PAC dosage. Addition of PAC enhanced DOC removals and membrane permeate fluxes. Furthermore, pre-ozonation reduced membrane fouling and enhanced membrane permeate flux.