铝电解智能控制技术的研究与应用

本文叙述了铝电解槽智能控制系统的组成,介绍了分布式控制系统在铝电解生产控制中的应用,并对铝电解过程控制的基本思想及其主要控制方法进行了详细阐述。本系统在实际应用中取得了良好的控制效果,为企业实现节能增效奠定了坚实的基础。     

古为今用——半坡船形彩陶壶设计之美的探析

半坡船形彩陶壶是件彩陶珍品，它的造型和纹样反映了半坡时期人们的生活、生产及审美状态。笔者在看到从船形彩陶壶中透出的集远古与现代为一体的气息，有感而发从设计美学角度对船形彩陶壶进行探析。     

电光天平操作系统的设计和实现

根据电光天平的操作特点，用Ｃ语言编码，配合Ｆｏｘ和ＡＵＴＯ ＣＡＤ接口，开发设计了一种电光天平操作的计算机系统软件。该软件用“宁重勿轻”法寻找电光天平的停点，将电光天平的构造、操作方法和训练考核融为一体，经实践证明，是一种实用的操作软件。     

Integration of biocatalytic conversions into chemical syntheses

The future application of enzymes in organic synthesis is in part dependent on excellent integration with the neighbouring chemical conversions. This paper outlines some of the key issues to be addressed to achieve optimal integration either by modification of preceding (or following) chemical steps, biocatalyst evolution or combinations of these approaches together with process engineering. Copyright © 2007 Society of Chemical Industry     

深海高压试验罐制造技术

主要阐述了试验压力比较高的深海高压试验罐的产品结构特性，以及在制造过程中的工艺难点，通过制定合理的工艺方法保证了产品的质量，并为类似产品的制造积累了宝贵的经验。     

弧形盒的组合凹模设计和热压罐成型技术

通过分析弧形盒三处凸台和一处凹坑"障碍体"对模具脱模的影响,得出采用凹模横向一处分型为最佳方案的结论,设计成凹模结构。介绍了弧形盒热压罐成型技术。经生产实践证明,该模具结构合理,制件脱模顺利,加工的弧形盒质量优良。     

圆锅流场中锌渣的物理模拟研究

目的 通过水力学模型和数学模型,研究使锌渣远离钢带表面,提升钢带质量的方法。方法 设计一个锌锅的透明水模型,对该实验模型内部锌渣的运动状态进行直观地研究,分析面渣、悬浮渣、底渣在不同工艺条件下的运动状况。并建立数学模型,计算温度分布和流场分布,验证水力学模型的合理性。 结果 随着钢带拉速的增大,旋涡涡心逐渐向两侧移动,较大的钢带拉速不仅可以有效促使锌渣远离钢带表面,还可以使被卷起的底渣增多以及截面上的悬浮渣量增加,同时钢带进入侧底部中心区域时,底渣也开始被卷起,最终形成了锤子形状,且数学模拟与物理模型实验现象基本一致。结论 对于表面渣来说,较大的钢带拉速可以有效促使锌渣远离钢带表面。对于悬浮渣来说,钢带拉速的增大有利于截面上悬浮渣的上浮。对于底渣来说,随着钢带拉速的增加,带动了锌锅内的钢液运动,使得锌锅内锌液的流动比较活跃。但拉速增大到一定程度后,底渣卷起过多,进入锌液,不利于钢带表面锌渣的去除。     

低压组合床重整装置腐蚀调查

重整装置腐蚀类型有高温H2腐蚀、高温H2-H2S腐蚀、有机酸腐蚀、H2S-HCl-H2O腐蚀,针对不同类型的腐蚀,应采取相应的防腐蚀措施。     

宜兴陶瓷堆花制品——花缸

本文从装饰方法、制作工艺、造型变化等多个角度,概述了宜兴陶瓷堆花制品花缸在各个不同历史阶段的发展变化及其特点。     

Organocatalyzed Conjugate Addition of Carbonyl Compounds to Nitrodienes/Nitroenynes and Synthetic Applications

The purpose of this study is to point out the synthetic utility of a new class of Michael acceptors (nitrodienes and nitroenynes). The highly enantioselective organocatalytic Michael addition of carbonyl compounds to these functionalized nitroolefins has been carried out in the presence of (S)‐diphenylprolinol silyl ether to achieve some interesting building blocks in high selectivities. The adducts thus obtained can be easily converted by taking advantage of the corresponding unsaturated carbon‐carbon bond. In presence of the double bond, metathesis or electrophilic activation could be carried out whereas in the presence of the triple bond electrophilic activation could be conducted. We thus focused on a gold‐catalyzed cyclization of the bis‐homopropargylic alcohol to afford the corresponding substituted tetrahydrofuran. Then, we also demonstrated that organic and gold catalysts were compatible in a one‐pot process. Indeed, we developed a one‐pot enantioselective organocatalytic Michael addition to a nitroenyne followed by a gold‐catalyzed acetalization/cyclization to achieve tetrahydrofuranyl ethers in high diastereo‐ and enantioselectivities with excellent yields.