应用化学专业综合实验的设计与教学实践

实验是理论知识转化为实践能力的重要手段,专业综合实验是多学科知识点的融合,更强调学生的自主性。为提高学生分析问题和解决问题的能力,培养高素质应用化学人才,本文对应用化学专业综合实验的设计和教学实践进行了探索,从实验内容设计、实验教学组织形式、实验考查模式和实验效果评价几方面探讨了应用化学专业综合实验体系。     

新工科与工程教育认证背景下生物工程专业微生物实验教学改革与实践

微生物实验是生物工程专业的专业基础实践课程,具有基础性、技术性和应用性等特征,是培养学生专业实践能力的基石。基于新工科和工程教育认证对高等教育人才培养提出的新要求,本文通过微生物实验课程体系、实验实践教学体系和过程评价体系的创新构建,阐述了微生物实验课程的教学改革与实践。通过实验教学改革与实践,不仅提升了微生物实验课程的教学效果,也培养了学生对专业知识的自主学习能力、理解创新能力和应用实践能力。     

氧化锌研制及光催化实验设计与实施

高级氧化技术是环境专业的学科前沿,以河南科技大学环境工程专业学生为对象,设计和实施一种氧化锌的固相制备及光催化降解水中亚甲基兰实验。与环境工程基础类实验比较,该实验具有设计新颖、目的明确、内容丰富、操作简便、实用性强等特点,该实验建立了理论教学与实践教学的桥梁,能显著提高学生的动手能力、探索能力和总结能力。     

制药工程专业实验教学改革与探索

专业实验在制药工程人才培养中具有重要的作用,是培养学生观察能力、实践能力和创新能力的重要环节和途径。文章针对传统教学模式下制药工程专业实验课程的教学现状和主要问题,介绍了岭南师范学院制药工程专业在实验教学体系方面的一些改革与探索,以期对制药工程专业实验教学体系改革提供一些思路和借鉴。     

新形势下高校物理化学实验的改革与探索

物理化学实验是高校化学专业的一门基础课程。为了提高物理化学实验课程的教学水平,我们深入分析了物理化学实验的教学现状并结合多年教学经验,对课程的教学改革提出了几点建议。教学质量的提升,需要根据不同专业积极调整课程内容,利用多种模式教学手段精心设计和讲解实验内容,引导学生独立完成实验操作和撰写实验报告,细化成绩考核,并不断丰富课程内容,从而提高教学质量,提高学生的学科兴趣和综合能力。     

应用化学综合实验能力培养的探索与实践

《合成化学实验》是应用化学专业高年级开设的一门专业核心课程,旨在培养该专业学生的综合实验能力。基于作者过去三年合成化学实验实践教学的实际情况,结合学生将来继续深造或者医药研发对于综合实验能力的现实需求,作者对合成化学实验课程的实践内容、教学方式方法、课程建设、课程管理和课程评价机制等方面进行了系统的改革。在四大基础化学实验课程的基础上,统筹化学综合实训(Ⅲ)(有机合成部分)和合成化学实验,初步构建了相对合理的应用化学专业综合合成实验能力培养的实践体系。     

酶工程专业课程的教学与思考

酶工程课程是高校生物技术以及生物工程专业的专业方向课.本文结合工作实践,从教学内容改革和强化实验研究两个方面,探讨了如何搞好《酶工程》教学,提高学生的学习积极性和实验参与能力问题.     

化工专业实验教学改革的创新与实践

文章阐述了化工专业实验的特点,结合化工专业实验教学的改革实践,探讨了如何在化工专业教学过程中提高学生综合素质和创新能力。在教学中通过改革教学方式方法、统筹安排教学内容,将课堂教学、实验教学与生产实际紧密结合,延伸实验室教学链,注重培养学生的专业能力和综合素质。     

环境监测课程的教学改革与教学研究

环境监测是环境工程专业学生的基础课之一,社会对环境类人才的环境监测能力提出了越来越高的要求,结合本院环境监测教学的现状,对环境监测课程进行教学改革。在明确专业培养目标和规格的情况下,确定了教改的基本思路,通过合理构建教学体系、规范教学、改革教材课程体系、加强实践教学体系建设、加强课程评价体系建设等一系列措施,全面提升环境监测理论和实验的地位,培养学生的创新能力、操作能力、综合能力和科研能力。使本专业的教学适应了培养目标的要求,保障了人才培养质量。     

化学工程与工艺专业实践性教学的改革与实践

实践性教学环节是高校工科专业人才培养的重要组成部分,本文总结了化学工程与工艺专业在基础化学实验、化工专业实验、化工仿真实训、生产实习、毕业设计(论文)和参加学科竞赛等实践性教学环节的改革与探索。通过几年来实践表明,实践性教学的改革教学效果显著。不仅能顺利完成人才培养方案对学生实践能力培养的要求,还能进一步提升学生的工程实践能力。     

与强者同场竞技 靠创新促进发展——访青岛福润德塑料挤出技术有限公司总经理赵炳仁先生

一年一届的中国国际塑料橡胶工业展览会(国际橡塑展),是全球多个行业寻找橡塑工业世界性商贸伙伴的机遇,也是企业开拓中国以至亚洲市场商机之"金钥匙"。在25届国     

Hydrogels reinforced with nanoclays with improved response rate

Two series of semiinterpenetrating networks (SIPN) based on linear hydrophilic poly(vinyl alcohol) (PVA) and thermo‐responsive poly(N‐isopropylacrylamide) (PNIPA), physically crosslinked with inorganic clay, are presented. The hydrogels with different crosslinking densities were prepared by varying the content of clay from 1 to 6 wt % and contained linear interpenetrant, PVA in the range of 0.5–1.5 wt %. The effect of clay content on swelling/deswelling behavior and phase transition in PNIPA gels, as well as the feasibility of reinforcing the gels with high molecular weight PVA, were analyzed. The thermal response of hydrogels, followed by DSC, confirmed that the insertion of hydrophilic PVA did not have a significant effect on the onset of the volume phase transition temperature, while the response was faster. The equilibrium degree of swelling of SIPNs and PNIPA hydrogels was in the range of 9–79 and decreased with increasing content of clay. The internal morphology and surface wettability of the hydrogels were investigated by scanning electron microscope analysis and contact angle measurements, respectively. The network structural parameters of the PNIPA and SIPN nanocomposites hydrogels, such as the average molecular weight between crosslinks, M_c, and effective crosslinking density, N_e, were determined by dynamic mechanical analysis. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44535.     

Electrodialysis with brine solutions oversaturated with calcium sulfate

Electrodialysis (ED) was applied to concentrate brine solutions of various concentrations — similar to effluentsfrom the desalination of brackish and industrial water — to about 20%. The consequent reduction in effluent volumes would facilitate a reduction in disposal costs. The energy requirement for concentrating solutions from 70 to 300 mN (0.4-1.8%) to 3.9 N (20%) was in the range 1.5-7.1 kWh/m³, in contrast to approximately 25 kWh/m³ by thermal evaporation. With the aim of preventing precipitation of CaSO4 on the membranes, laboratory-scale ED experiments were carried out on solutions of different compositions to determine the conditions that would lead to the precipitation of excess gypsum on gypsum seeds in a separate precipitator. The results were then applied in a pilot-scale ED unit in which the brine that circulated through the ED brine cells passed through a separate CaSO, precipitator containing gypsum seeds.     

Biological studies with cyclopropenoids inactivated with fatty acids

Cyclopropenoids inactivated by reactingSterculia foetida oil with cottonseed oil fatty acids were fed at three dietary levels to growing rats and laying hens for 4 weeks. At the termination of the experiments, all animals were autopsied and examined microscopically for pathological lesions, but no pathology that could be related to dietary treatment was observed. Hemoglobin, packed cell volume and plasma cholesterol were similar in animals fed all of the diets. Growth rate of rats and egg production of hens fed the experimental diets were similar to those of animals fed the control diet. After 3 and 6 months of storage, eggs from hens fed the inactivated cyclopropenoids were normal and showed no evidence of the unusual characteristics of cyclopropenoid feeding. Lipids of heart, liver and adipose tissues of all the rats and hens varied little from the normal fatty acid composition. Small amounts of three unidentified fatty acids were found in the adipose tissues of rats fed the higher levels of inactivated cyclopropenoids. The results of these feeding studies suggest that inactivation of cyclopropenoids with fatty acids eliminates the unusual biological effects attributable to cyclopropenoids. Presented at the AOCS Meeting, New Orleans, April 1970.     

高压电动机受潮现场处理的技术分析

山东铝业公司水泥厂（以下简称我厂）运行的大型高压电动机较多．有时由于长时间停运或者环境的潮湿，导致电动机的绝缘水平下降，致使电动机不能再次正常启动。因大型电动机是企业的关键设备，其运行好坏直接影响企业生产的正常与否，进而影响企业效益。     

以创新谋发展 以协作促转型

复合肥行业的转型升级已被列为化肥行业"十三五"规划重要内容。介绍我国复合肥行业转型发展期的特征,并提出在此形势下复合肥行业的发展思路;以创新谋发展,促进行业技术水平提高;以协作促转型,助推行业转型发展。     

以创新铸就名牌 以名牌促进发展

介绍厦门正新橡胶工业有限公司在观念、产品、管理和技术方面开展创新活动的经验。观念创新是名牌战略的灵魂,相互理解与支持、创建伙伴关系是公司对外往来的原则,坚决实施名牌战略,坚持以人为本、适才适用的原则;产品创新是占领市场的法宝,根据市场需求不断适时开发新产品;管理创新是维护品牌形象的前提,各项试验均执行企业内控标准,严把产品质量关;技术创新是实施名牌战略的源泉,以自有技术开发各种轮胎。通过开展创新活动,公司利税指标一直位居国内前列。     

Crosslinking of styrene-butadiene rubber with polyurethanes bicapped with benzyocyclobutene

Summary A polyurethane prepared from 1,9-nonanediol and toluene-2,4-diisocyanate with M_n=11,840, was capped on both ends in a reaction with 4-(benzocyclobutenyl) methanol. The polyurethane was used to crosslink styrene-butadiene rubber through Diels-Alder reactions on the benzocyclobutene functionality. The synthesis and characterization of 4-(benzocyclobutenyl) methanol, a molecule not reported previously, is presented. The crosslinking reaction was carried out on intimate mixtures of the telechelic polyurethane and SBR at elevated temperature and pressure. Various physical properties of the crosslinked material were studied.Work done at the Department of Chemistry, University of Akron, Akron, OH 44325, USA     

Boundary-Layer Structure with Hydrogen Combustion with Different Injection Intensities

Results of numerical simulation of the influence of intensity of hydrogen injection through a porous surface in the case of hydrogen burning in the boundary layer are presented. Turbulent characteristics of the flow were simulated using the k–epsiv; turbulence model with Chien's modification for low Reynolds numbers. The diffusion model (infinitely large burning rate) was used to describe the chemical reaction process, but the difference in diffusion coefficients of different substances was taken into account. A comparison of injection with and without combustion shows that the presence of a heat-release front delays the laminar–turbulent transition and significantly deforms the profiles of density and viscosity of the gas mixture. As the injection velocity increases, the flame front is shifted from the porous surface toward the outer edge of the boundary layer. The contributions of injection itself and combustion to reduction of skin friction are analyzed. Key wrds: boundary layer, combustion, porous injection, heat and mass transfer, friction.