BNT基无铅压电陶瓷掺杂改性的研究现状及发展趋势

综述了近几年Bi_（0.5）Na_（0.5）TiO_3（BNT）基无铅压电陶瓷体系掺杂改性方面的研究成果及发展现状。阐述了不同添加物对掺杂改性的作用机理,总结了BNT基无铅压电陶瓷制备的新工艺、新方法及其新进展,同时对BNT基无铅压电陶瓷的发展趋势做了展望。     

发酵工程教学中培养学生专业能力的探索

基于专业人才培养目标和行业需求,在发酵工程课程教学中,我们提出了培养学生三层次的专业能力的目标,即综合能力、专项能力和单项能力。通过改革教学内容,改进教学方法,完善实践教学体系、开展课外科技活动,学生增强了专业能力的适应性、应用性和创新性。     

源于《化工原理》的《食品工程原理》教材编写创新研究

针对国内《食品工程原理》本科教材编写的现状,我们提出了需要创新编写思路的问题,从借鉴国际先进的教育指导思想、采用新主线系统化和简化内容、融合创造意识、融合现代计算技术四方面考虑,探索了《食品工程原理》教材编写创新的可能途径。借鉴国际先进的教育指导思想、融合现代计算技术以学习国际先进经验达到编写出新;采用新主线系统化和简化内容、融合创造意识则是主动创新,两者结合可以编写出新的《食品工程原理》教材。     

Adsorption and inhibitive action of hexadecylpyridinium bromide on steel in phosphoric acid produced by dihydrate wet method process

The adsorption and inhibitive action of hexadecylpyridinium bromide (HDPB) on the corrosion of cold rolled steel (CRS) in phosphoric acid produced by dihydrate wet method process (7.0 M H₃PO₄) was studied by weight loss, open circuit potential (OCP), potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS), scanning electron microscope (SEM), and atomic force microscopy (AFM) methods. The results show that HDPB is a good inhibitor in 7.0 M H₃PO₄, and its maximum inhibition efficiency (IE) is higher than 90% at little concentrations. The adsorption of HDPB obeys Langmuir adsorption isotherm equation. Thermodynamic parameters (adsorption enthalpy ∆H ⁰, adsorption free energy ∆G ⁰, and adsorption entropy ∆S ⁰) were calculated and discussed. Polarization curves show that HDPB acts as a mixed-type inhibitor in phosphoric acid. EIS shows that charge-transfer resistance increases with the inhibitor concentration, confirming adsorption process mechanism. The inhibition action of HDPB could also be evidenced by SEM and AFM images. A probable inhibitive mechanism is proposed from the viewpoint of adsorption theory.     

基于UG注塑模具标准件三维参数化图形库的开发

分析了开发注塑模具标准件三维参数化图形库的必要性,提出了基于UG平台采用VC编译建立新国标注塑模具标准件图形库的思路:通过调用数据库中的参数数据或直接由用户界面输入,应用参数化设计技术在UG中生成标准件实体模型。     

多巯基水性EP低温固化剂的制备及性能研究

首先制备了PUD-SH[多巯基封端的PU(聚氨酯)水分散体]和水性EP(环氧树脂),然后将两者按n(巯基)∶n(环氧基)=1∶1复合,并在不同温度时成膜,制得厚度约100μm的复合固化涂层。研究结果表明:PUD-SH和水性EP之间发生了环氧基开环反应,固化后复合涂层透明柔韧,其凝胶量接近100%,涂层的吸水率<17.50%,硬度>6H,耐甲乙酮擦拭次数>1 600次;固化时叔胺促进剂的存在可有效提高复合固化涂层的固化度,缩短其固化时间,但对其他性能影响甚微。     

海豚充电器产品与模具开发制造

以海豚充电器上壳模具开发制造为例,重点探讨运用数字化建模制造技术、模流分析理论以及现代成型技术设计制造模具的过程,包括产品造型、成型零件的加工、型腔数量及模架确定、浇注系统设计、推出方式确定、以及冷却系统设计.     

聚丙烯保压注射成型冷却过程温度场的研究

采用数值模拟结合实验验证的方法,对聚丙稀（PP）注射成型（保压和不保压）冷却过程实验和数值模拟进行分析。用数据采集器对不同共混物注射冷却过程中的温度变化进行数据采集,并将采集所得温度的实验值与根据改进焓法用Matlab软件对聚丙烯冷却过程中温度分布进行数值模拟计算所得的值进行了比较分析,结果表明聚丙烯在液体冷却段温度分布的实验值与理论值几乎完全吻合,在结晶段和固体冷却段实验值略有不同。     

Functionalization of reduced graphene oxide nanosheets via stacking interactions with the fluorescent and water-soluble perylene bisimide-containing polymers

Reduced graphene oxide (RGO)-polymer composites were prepared via π-π stacking interactions of RGO with the perylene bisimide-containing poly(glyceryl acrylate) (PBIPGA). PBIPGA was synthesized via atom transfer radical polymerization (ATRP) of solketal acrylate (SA), using bifunctional N,N′-bis{2-[2-[(2-bromo-2-methylpropanoyl)oxy]ethoxy]ethyl}perylene-3,4,9,10-tetracarboxylic acid bisimide (PBI-Br) as the initiator, and subsequent hydrolysis of the acetal-protecting group. PBIPGA was characterized by ¹H NMR spectroscopy, gel permeation chromatography (GPC), UV-visible absorption spectroscopy and fluorescence spectroscopy. The presence of π-π stacking interactions between PBI and the RGO surface was suggested by fluorescence and UV-visible absorption spectroscopy results. The chemical states and π-π stacking interaction, morphology, and composition of RGO-PBIPGA composites were characterized, respectively, by X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and thermogravimetric analysis (TGA). The low cytotoxicity level of the RGO-PBIPGA composites was revealed by incubation with 3T3 fibroblasts in 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assays in vitro.     

Synthesis and Characterization of Glycoside-Based Trisiloxane Surfactant

The synthesis of glycoside-based trisiloxane surfactants of the general formula Me₃SiOSiMeR¹OSiMe₃ (R¹ = (CH₂)₃(OCH₂CH₂)₂OR², R² = glycosyl) is described, and the surface activity properties of the surfactant are studied. Diethylene glycol monoallyl ether glycoside is synthesized by reacting the diethylene glycol monoallyl ether with glucose. The glycoside-based trisiloxane surfactant is prepared by hydrosilylation of the precursor glycoside with hydrogen-containing trisiloxane. The product is structurally characterized by IR, ¹H NMR and MS. The surface tension of an aqueous solution is reduced to approximately 20 mN m⁻¹ at concentration level of 10⁻⁴ mol L⁻¹.