影响硫酸钾产品质量的因素

为了解决硫酸钾生产中出现的质量问题，提高产品的优级品率，简要叙述了生产硫酸钾的基本原理及质量标准，考察了对硫酸钾产品中氯离子的影响因素，如反应温度、投料量、加酸量。同时考察了影响硫酸钾产品中游离硫酸的因素和原料氯化钾中氧化钾含量及反应炉的维修、加灰量、耙齿安装等因素对产品中氧化钾含量的影响，确定了曼海姆炉的生产工艺，操作指标，为生产出合格的优级品提供保证。     

数字名瓷 历历家珍——陶瓷器物数字命名例说

纵观陶瓷发展历程，数字与品种命名相结合，使品种方便记忆辨识，也颇显韵味。陶瓷中由于历史发展、社会变迁，陶瓷产品种类出现众多变化，而陶瓷产品变化中又有其独特的特点，从原料生产、制作工艺、制作题材、规格大小、风俗文化内容；从产品功用到产品造型等均出现了以数字表现并命名的陶瓷器产品。     

聚乙烯通讯电缆护套料DFH2076的开发

介绍了在全密度聚乙烯（PE）装置上生产PE通讯电缆护套料DFH2076基料的生产技术和经验，解决了生产过程中出现的反应器静电、结块以及产品熔体流动指数控制的难点。研制的PE电缆通讯护套料产品具有分子量分布较宽、氧化诱导期达到130min、耐环境应力开裂性超过600h、加工性能良好等特点，经过国家检测中心的评定，各项性能指标达到或超过了国家标准。在用户实际使用中，产品加工性能良好，挤出的电缆稳定光滑，完全满足了用户的要求。     

联碱碳化塔“挂硫”除铁的可行性分析

纯碱产品出现“色碱”是联碱生产中常见的现象，而“色碱”产生的原因是产品中出现了铁杂质，本文结合生产实际情况，从化学反应机理角度分析纯碱产品含铁现象的根源，并针对传统的碳化塔“挂硫”操作对碳化反应的利、弊进行了分析，对“挂硫”的可行性进行了全面论证，最终提出了可行性解决建议。     

关于高熔指聚丙烯低气味生产技术研究

聚丙烯产品,尤其是高熔指聚丙烯,在使用中出现了不同程度的气味问题,降低了产品的安全性和适用性。国内外专家和学者普遍认为,导致聚丙烯产品存在气味的主要原因是低相对分子质量挥发性物质。根据DOW公司UNIPOL气相流化床聚丙烯生产工艺对高熔指聚丙烯生产加工过程中出现气味的主要原因进行系统分析,并在粉料生产控制、过氧化物添加剂选择、粒料生产控制以及产品后续处理等方面提出了有效的控制措施。     

环氧大豆油生产中一些技术问题的探讨

本文针对生产中出现的产品酸值高、色泽深、环氧值低、热稳定性差等技术问题,从整个生产过程着手,分析了每一环节出现的问题,并提出了可行的解决办法.     

粘胶丝出现低强、低伸的原因分析及预防措施

在粘胶长丝的生产中，成品丝时常出现低强、低伸现象，使产品降等。为此，我们对粘胶长丝出现低强、低伸的原因做了大量细致地调查，测试了诸多相关数据，进行模拟试验，基本找到了造成丝条强度和伸度低的原因，并积极采取措施，使强度和伸度降等得到有效控制。     

尿素装置投产以来运行总结

渭化集团公司的尿素装置投产已6年整了。总结对比了开车以来的尿素产品的产量、消耗、产品质量、停车次数等各项指标，列举了工艺、设备、电仪等方面出现的问题。通过消化、吸收尿素装置的技术，进行了多项技改技革，收到了明显的效果。提出了今后进一步搞好生产，降低成本，生产优秀产品的奋斗目标。     

含蔗糖聚醚多元醇浑浊原因探讨

对含蔗糖聚醚多元醇产品在生产过程中出现浑浊的原因进行了探讨，并对在生产中取得的经验作了归纳和总结。     

PVC生产中汽提塔的改造

介绍了PVC生产装置中汽提塔的工作原理及结构。在高海拔地区的实际生产过程中,频繁出现汽提塔"堵塔"、PVC产品杂质含量高等问题,严重影响了PVC产品的质量和生产的正常、稳定运行。通过在汽提塔塔顶增加冷凝设备,降低塔顶温度,较好地解决了存在的问题。     

粗汽油进提升管改质对汽油烯烃及产品分布的影响

催化装置粗汽油回炼技术在有效降低催化稳定汽油烯烃含量的同时,对催化装置产品分布产生明显的影响,继而影响到装置的综合经济效益。本文对不同粗汽油回炼量条件下,催化装置稳定汽油性质和产品分布变化趋势进行分析,对经济效益进行对比,阐明应用粗汽油回炼降低汽油烯烃技术时,要选择合适的操作条件,以期得到较好的综合经济效益。     

底座连接口特征参数对显示器后壳注塑质量的影响分析

在Moldflow分析软件的基础上,对显示器后壳进行仿真研究,以翘曲变形量为质量指标,结合控制变量法进行单因素变动实验,保持注射工艺参数不变,研究显示器后壳底座连接口对制品翘曲变形的影响。对数据进行图表分析,结果表明显示器后壳尺寸定位68.58 cm(27英寸)时,底座连接口选用圆形,连接口位置距离底边26 mm,尺寸为直径21 mm的时候模具翘曲表现更好。     

磷石膏中杂质及除杂方法研究综述

磷石膏是湿法生产磷酸过程中的一种固体废弃物,是我国排放量很大的化学石膏。作者首先介绍了磷石膏的特性及应用现状,就磷石膏中杂质进行了分类和讨论,对磷石膏除杂工艺研究方法进行了分类介绍,对各种除杂方法的特点进行了归纳总结。     

The role of the symmetry and the flexibility of the anion on the characteristics of the nanostructures and the viscosities of ionic liquids☆

The transport properties of ionic liquids (ILs) are crucial properties in view of their applications in electrochem-ical devices. One of the most important advantages of ILs is that their chemical–physical properties and conse-quently their bulk performances can be well tuned by optimizing the chemical structures of their ions. This will require elucidating the structural features of the ions that fundamentally determine the characteristics of the nanostructures and the viscosities of ILs. Here we showed for the first time that the“rigidity”, the order, and the compactness of the three-dimensional ionic networks generated by the anions and the cation head groups determine the formation and the sizes of the nanostructures in the apolar domains of ILs. We also found that the properties of ionic networks are governed by the conformational flexibility and the symmetry of the anion and/or the cation head group. The thermal stability of the nanostructures of ILs was shown to be con-trolled by the sensitivity of the conformational equilibrium of the anion to the change of temperature. We showed that the viscosity of ILs is strongly related to the symmetry and the flexibility of the constitute ions rather than to the size of the nanostructures of ILs. Therefore, the characteristics of the nanostructures and the viscosities of ILs, especially the thermal stability of the nanostructures, can be fine-tuned by tailoring the symmetry and the conformational flexibility of the anion.     

煤焦油中含水量与密度之间的关联研究

以中煤九鑫焦化有限公司煤焦油为样品,探讨了不同温度下煤焦油水分与其密度之间的关联关系。结果表明,在不同温度下,含水质量分数4%焦油的密度随温度升高而不断降低;同一温度下,焦油密度随含水量升高而降低。实际生产中,可利用密度推算出一定温度下的焦油含水量,从而及时调整小氨水澄清槽焦油水分离以及焦油产品储槽自动控制水分脱除程度(≤4%),以减少脱水消耗蒸汽量。     

Estimation of the micromixing time in the torus reactor by the application of the incorporation model

On the basis of previous experimental results in a torus reactor, micromixing time is determined using the incorporation model. Obtained results allowed the characterisation of the performances of this new configuration of reactor in comparison to other reactors, such as the stirred tank reactor. In addition, a correlation is proposed for each incorporation law, in order to determine the micromixing time from the experimental micromixedness ratio (α). Finally, in terms of Kolmogorov's turbulence theory, a relationship between micromixing time and the local energy dissipation rate is obtained and compared to those previously published.     

On the Case of the Misplaced Hydrogens

Few other elements play a more central role in biology than hydrogen. The interactions, bonding and movement of hydrogen atoms are central to biological catalysis, structure and function. Yet owing to the elusive nature of a single hydrogen atom few experimental and computational techniques can precisely determine its location. This is exemplified in short hydrogen bonds (SHBs) where the location of the hydrogen atom is indicative of the underlying strength of the bonds, which can vary from 1–5 kcal/mol in canonical hydrogen bonds, to an almost covalent nature in single-well hydrogen bonds. Owing to the often-times inferred position of hydrogen, the role of SHBs in biology has remained highly contested and debated. This has also led to discrepancies in computational, biochemical and structural studies of proteins thought to use SHBs in performing chemistry and stabilizing interactions. Herein, we discuss in detail two distinct examples, namely the conserved catalytic triad and the photoreceptor, photoactive yellow protein, where studies of these SHB-containing systems have permitted contextualization of the role these unique hydrogen bonds play in biology.     

Analysis of the behaviour of the structural concrete after the fire at the Windsor Building in Madrid

The analysis of the concrete subjected to high temperatures is usually undertaken by means of tests specifically designed and carried out in the laboratory, or by using theoretical approaches using standardized curves for theoretical fires. An analysis by different techniques has been carried out on structural concrete to real fire of Windsor Building in Madrid, which was severally damaged by a fire in 2005. These techniques are X‐ray diffraction, differential thermal and thermogravimetric analysis and backscattered electron microscopy with dispersive X‐ray microanalysis. Samples of the concrete were taken from different floors in the building and analyses were carried out at different depths starting from the surface exposed to the fire itself. The analysis allows the damaged area to be limited as well as situating the 500^°C isotherm in the concrete element. In accordance with the results obtained, the damage is limited to just a few centimeters from the surface exposed to the fire itself, in spite of its prolonged exposure to the fire. This would justify that the concrete has demonstrated a suitable resistant behaviour. Likewise, it can be deduced from the results obtained that the fire, to which the concrete was subjected, can be qualified as severe. Also, these results can confirm that the calculation hypothesis in the project is correct in relation to the fire resistance exigencies of the concrete. Copyright © 2009 John Wiley & Sons, Ltd.     

试论全日制专业学位研究生思想政治教育的特点、难点和突破点

目前,全日制专业学位研究生在校生已具有相当规模,他们的思想状况究竟有哪些特质,给我们的思政工作带来了哪些新挑战,突破点在哪里？这些都是我们亟待解决的问题。本文旨在结合作者的工作体会,对以上问题进行探究。     

土壤特性及铅迁移转化规律的研究

通过对土壤的理化性质pH值、有机质、腐殖质的测定,寻找出土壤的理化性质对铅的含量与分布的影响规律,并进一步摸索出土壤中不同形态铅的浸提剂,测定各形态铅的含量,总结出了铅在土壤中的迁移转化规律,为铅污染的防治提供了理论依据。