健美操优化模式教学的研究

我们改变了传统的以竞技为中心,以提高运动成绩为目的教学模式,构建了以培养学生终身体育意识为目标、增强体质、提高综合能力为核心,以启发学生学习的自主性和创造能力,全面提高身体素质为目的的新教学模式。     

2013年中国聚氨酯制品消费前景预测

本刊讯中国聚氨酯产业布局目前已基本形成了以上海为中心的长三角地区、以烟台为中心的黄河三角洲环渤海地区、以广州为中心的珠三角地区、以葫芦岛为中心的东北地区、以兰州为中心的西北地区以及正在形成的以重庆为中心的西南地区、以福建泉州为中心的海西地区等聚氨酯产业聚集地区。中国是世界第三大经济体,也是聚氨酯的第二大消费市场。首先,中国生产了全世界95%的冷藏集装箱、     

过程装备与控制工程专业实验综合改革与实践

北京石油化工学院过程装备与控制工程专业以"建立工程意识,培养创新精神,提高实践能力"为主导思想,从教学内容、实验装置和教学方法三方面,对专业实验教学进行了综合改革,形成了以验证性实验为基础,以综合型、设计型实验为主体,以创新型实验为特色的格局,扭转了以教师讲授和示范为主的教学模式,形成了以学生为主体、以教师为主导的启发式、引导式教学模式,符合工程教育认证的理念,必将促进教学相长,提高教学效果。     

天津石化电气设备完整性管理体系建设与实施

设备完整性管理体系是以KPI为引领,以风险管控为中心,以“可靠性+经济性”为原则,以全生命周期运行为主线,以业务流程为依据,以信息技术为依托,通过管理与技术的融合,传承中国石化传统设备管理好的做法,引进创新设备管理理念和技术工具并使之有机融合,以体系化的思想为指导,聚焦设备管理,实现了设备管理制度化、制度流程化、流程表单化、表单信息化。本文介绍了天津石化设备完整性管理体系,重点阐述了电气专业体系关键要素建设与实施情况。     

智慧型工程项目管理平台的开发与设计

分析了当前水泥工程模块化项目管理平台的弊端及产生原因,创新提出了一种以项目管理数据为基础,以项目实施策划为主导,以时间为管理轴线,以各子项工程为空间定位,以业务活动管理为核心,以进度、质量、成本管理为绩效考核重点的智慧型工程项目管理平台,通过构建“数据库、项目实施策划、业务管理、绩效管理、职能管理”五大功能模块,实现了对各项工作的智能化引导与项目管理过程数据的互联、互通,提高了项目管理的智能化水平。     

地方高校基础化学教学改革研究

长江大学以专业建设、教学团队建设、课程建设等质量工程项目为依托,提出以创新型人才培养为导向,以思政教育理念为指导,以提升教师责任感和教学能力为核心,以完善的教学管理制度和运行机制为保障,以课程体系改革和教学模式、教学方法改进为主线的基础化学教学改革总体思路,并进行了相应的实践探索,取得了良好的成效,可为其他地方高校基础化学教学改革提供参考。     

以创新求发展——三工橡胶公司生产经营成效喜人

今年上半年,山东三工橡胶有限公司坚持以发展为主题,以经济效益为中心,以市场为导向,以投入为主线,以改革为动力,以管理为突破口,提出了以创新求发展的战略要求,不断调整产品结构,规范经营模式,克服影响企业发展的种种不利因素,促进了企业经济的健康稳定发展,生产经营取得了可喜成绩。1～6月,公司实现销售收入3.5亿元,实现利税3530万元,出口创汇350万美元,分别比去年同期增长38.89％、79.96％、169.23％。     

促进燕山石化全面持续健康发展思路研究

介绍了燕山石化现状和今后发展要解决的主要问题,提出了以科技进步为动力,以结构调整为主线,以全面提升综合竞争力为目标,促进燕山石化全面、持续、健康发展的思路。     

“化工原理+”与“IDEA”教学模式的构建与实践

立足化工专业升级,依托化工原理课程建设与教学改革,文章凝练了“化工原理+”与“IDEA”创新教学模式,以问题为导向、以目标为牵引、以方法为支撑、以资源为保障,贯穿课程思政建设全过程。在创新教学模式下,教学团队通过增加课程难度、重构教学内容、组织创新竞赛,提高课程的“两性一度”,提升了高素质创新型人才培养质量,取得了良好的效果。     

2,3-环碳酸甘油酯甲基丙烯酸酯的合成

以甲基丙烯酸缩水甘油酯(GMA)为原料合成了2,3-环碳酸甘油酯甲基丙烯酸酯(PCMA),并通过FTIR、1HNMR、元素分析等方法对环碳酸酯进行了表征。详细讨论了催化剂的种类、反应温度、反应压力、反应时间对收率的影响。结果表明,以质量分数0.5%的四丁基氯化铵(TBAC)(以单体质量计,以下同)和质量分数0.5%的四丁基溴化铵(TBAB)(以单体质量计,以下同)为共催化剂,质量分数为0.5%的特丁基对苯二酚(TBHQ)(以单体质量计,以下同)为阻聚剂,当温度为85℃,二氧化碳压力为1.2 MPa,反应15 h时,产物收率达到63.3%。     

沉淀硫酸钡的干燥

介绍了回转干燥窑干燥系统和两级空心浆叶干燥系统流程、设备结构特点和工作原理 ,对其优缺点进行详细的分析比较 ,肯定了这两种干燥系统是工业普钡生产的主要干燥方法。     

Jet-pump crystallizers in reaction-crystallization processes with solid reagent–barium sulphate precipitation study

The research results concerning barium sulphate precipitation from the concentrated water solutions of barium chloride by means of crystalline ammonium sulphate addition are presented. The experiments were carried out in a continuous laboratory DTM crystallizer with inner circulation of suspension. A liquid jet-pump device generating ascending/descending flow of medium in a mixing chamber was used. Influences of barium chloride concentration in a feed solution (5–24 mass%), process temperature (303–348 K), mean residence time of suspension in a crystallizer working volume (600–10,800 s) and direction of circulation in jet-pump's mixing chamber on the resulting crystal size distribution of barium sulphate were investigated. Neural network models of the process were elaborated, providing the basis for the theoretical analysis of the influence of hydrodynamic regime on the population density distributions of crystal product. Conformity of the simulated population density distribution data with the experimental ones, as well as with the SDG kinetic model predictions was analyzed, verified and discussed.     

火焰原子吸收光谱法测定硫酸钡中的游离钡

关于硫酸钡中游离钡的含量,国标中没有规定分析方法,随着硫酸钡用途的增加,游离钡的含量已成为硫酸钡产品中一个重要的杂质指标。提出了用火焰原子吸收分光光度法分析硫酸钡中的游离钡,并对溶解试样过程中酸度的控制、燃气的流量控制、助燃气的选择等影响因素进行了讨论。在波长553.6 nm、氧化亚氮作助燃气的条件下进行实验,计算得到的相对标准偏差为1.6%~3.5%,加标回收率为99.13%~100.07%,灵敏度为0.2,钡的检出限为0.2 mg/L,该方法具有低干扰性和高准确性的特点,测定结果令人满意,能够满足工业化生产要求。     

水质中硫酸盐的快速测定方法

硫酸盐的测定都需转 ＢａＳＯ４的形式来测定,而硫酸钡比铬酸钡稳定,因此,在含有硫酸盐的试液中加入铬酸钡,则硫酸盐可定量取代出铬酸根,生成更稳定的硫酸钡,由光度法定量测出铬酸根的量,便可计算出硫酸根的量。     

均匀沉淀法制备不同粒径的纳米Cu（OH）2

以无水硫酸铜和氢氧化钡为原料,采用均匀沉淀法研究了不同粒径纳米Cu（OH）2的制备,考察了搅拌温度、硫酸铜溶液浓度等反应条件对纳米Cu（OH）2粒径的影响。实验结果表明,用均匀沉淀法可以制备出不同粒度的纳米Cu（OH）2颗粒。反应条件对纳米Cu（OH）2的粒径有显著影响,反应温度越高,纳米粒子的粒径越小;硫酸铜溶液的浓度越高,纳米粒子的粒径越大。     

Turbulent precipitation in micromixers: CFD simulation and flow field validation

The object of this work is the investigation of the process of nanoparticles turbulent precipitation in a micromixer, the Confined Impinging Jets Mixer. This study is motivated by the increasing importance that nanoparticulate systems have for applications in several fields and by the consequent necessity of developing an economical and reliable process for the production of nanoparticles with the desired qualities, in terms of size, morphology and composition. The precipitation process is among the most promising processes for this purpose, and micromixers, such as the CIJM, are employed because they provide high mixing rates and efficiencies, which are needed because the process is highly mixing sensitive. Here a precipitation model based on classical precipitation theory and Computational Fluid Dynamics was developed and tested on barium sulphate precipitation, which is often employed as a mixing sensitive test reaction alternative to parallel competitive reactions. The use of barium sulphate precipitation also allows to assess the capability of the CIJM of producing very fine particulate systems. The flow field is modelled with a RANS approach, and validated through comparison with experimental data, obtained with the microscopic Particle Image Velocimetry. Model predictions on barium sulphate mean particles size were compared with experimental data and good agreement was found.     

Evaluation of barium,rubidium and strontium contents in commercial fertilizers

From various manufacturers and distributors 48 fertilizer samples were collected and analyzed for contents of barium, rubidium and strontium by atomic absorption spectrophotometry. The investigated elements are almost always detectable in appreciable amounts in straight and compound fertilizers originated from natural rocks and salt deposits; whereas synthetic nitrogen fertilizers contain in every case low amounts of rubidium, no barium and appreciable quantities of strontium only in some cases. Potassium sulphate fertilizers appear to be the major source of rubidium and superphosphate and calciumcyanamide the source of barium, whilst the three of them supplied sensible amounts of strontium to fertilized soil to affect its average total content to a various degree.     

反应沉淀法制备超细硫酸钡的研究

以精制硫化钡溶液和硫酸钠溶液为原料，在调速泵内采用液－液相反沉淀法合成超细颗粒硫酸钡液体，其条件为：硫化钡溶液质量浓度为15％，硫酸钠溶液质量浓度为26％，加入DTPA螯合剂，化合泵转速为2500r/min，得到平均粒径小于100nm的超细硫酸钡产品。     

应用CFD技术对工业结晶过程进行模拟和放大

Some empirical mixing models were used to describe the imperfect mixing in precipitation process.However, the models can not, in general, reflect the details of interactions between mixing and crystallization in a vessel. In this study, CFD (computational fluid dynamics) technique were developed by simulating the precipitation of barium sulphate in stirred tanks by integration of population balance equations with a CFD solver. Two typical impellers, Rushton and pitched blade turbines, were employed for agitation. The influence of feed concentration and position on crystal product properties was investigated by CFD simulation. The scale-up of these precipitators was systematically studied. Significant effect on the crystal properties was found for the scale-up under some conditions.Keywords simulation, scale up, precipitation, CFD(computational fluid dynamics)     

沉降离心机分离沉淀硫酸钡试验研究

阐述了硫酸钡生产过程中固液分离工艺目前存在的现状,提出了用卧式沉降离心机来代替该行业常用的真空叶片机或厢式压滤机,并优化卧式沉降离心机的工艺参数是:转速3 000转/分、溢流直径138毫米、差转速30转/分,利用该设备能减少硫酸钡的损失,提高硫化钠的回收率。