6400吨液压复式起重机测控系统研究

6400吨液压复式起重机是全球起重能力最大的陆地起重机,最大额定起重量6400吨,起吊高度120米,设备设计制造国产化率100%。到2013年底,已成功应用于山西潞安高硫煤清洁利用油化电热一体化示范项目两台费托合成反应器的吊装。本文介绍了该起重机测控系统的组成和基本性能,对石油化工行业大型反应器罐的吊装具有重大推广意义。     

牛奶中尿素现场快速检测方法的研究

本文建立了一种现场快速检测牛奶中尿素含量的方法。系统考察了试剂用量、反应时间和温度等因素对测定结果的影响。结果表明,在尿素含量为0.001%～0.050%范围内,尿素浓度与反应体系吸光度间具有良好的线性关系,其线性相关系数R=0.9998;分别对高、中、低3个浓度的样品,进行了6次重复测定,相对标准偏差在1.32%～2.04%之间。在三个不同浓度添加水平下,加标回收率为99%～105%。从实验结果可知该方法具有较高的灵敏度和准确度,而且操作简单,整个检测过程仅需10 min,适用于牛奶中尿素含量的现场快速定量检测,为生鲜乳安全提供有效的检测手段。     

兆瓦级风电机组抗台风塔架设计的初步研究

根据某风电场台风的特点确定风机设计等级,在此基础上通过对塔架基本尺寸的预假设并建立基本物理模型,基于有限元法并根据风电设备的设计规范对抗台风风力发电机组塔架的主体塔筒进行了初步分析,主要包括塔架的低级频率和极限强度计算。通过对该风电机组初步设计中的塔架的基本设计工作初步确定该的塔架的固有频率和极限强度均满足风电机组的设计规范要求。然而建议在对抗台风风力发电机组塔架详细设计阶段必须进行进一步优化设计在强调足够的情况下减小尺寸,降低制造和运输成本。     

国产DCS在大型多晶硅生产装置中的应用

多晶硅是太阳能光伏产业和电子工业的基础原料,其发展前景光明。随着国内集散控制系统(DCS)的不断成熟和完善,国产DCS逐步打破了国外DCS长期在多晶硅行业的垄断局面。本文在阐述了1500吨/年多晶硅生产装置中的生产工艺基础上,基于国产ECS-100DCS控制系统完成DCS总体设计和关键控制方案,针对工艺特点提出了多种模式自动控制方案、安全联锁保护、智能设备信息集成方案等,这些成果在1500吨/年多晶硅生产装置上得到成功应用。     

Synthesis of carbon microspheres from urea formaldehyde resin

Carbon microspheres were synthesized through polymerization of urea/formaldehyde in the presence of formic acid as catalyst, followed by drying and carbonization in an inert atmosphere. The samples were characterized by SEM, XRD, HRTEM, elemental analysis and XPS. The obtained carbon microspheres were amorphous indicated by the results of XRD and HRTEM. The changes of nitrogen functionalities at 400-1000 °C were determined by XPS. The fraction of pyridine nitrogen and pyrrole/pyridone nitrogen decreased with increasing temperature, whereas the amount of quaternary nitrogen increased.     

图形环境下的汉诺塔演示

经典的汉诺塔问题的求解主要是采用递归算法来实现。但是在不同的语言开发环境下,其求解过程主要是以控制台模式的字符方式来显示算法的运算结果。基于控制台模式下移动汉诺塔的运算结果虽然正确,但存在感观上不直观的原因,文中提出了在图形环境中显示移动汉诺塔运算结果的观点,采用了面向对象的程序设计思想和传统的递归程序设计方法,结合图形环境中相关的绘图知识,使移动汉诺塔的运算过程更形象、更直观,达到了更好的可视化演示效果。     

提高塔式起重机运行监控系统可靠性的方法

运用可靠性设计理念 ,从设计、技术、工艺等方面对塔式起重机监控系统的可靠性进行分析 ,提出了提高可靠性的技术方案和相应措施。     

CDMA近海海域覆盖解决方案

简述了近海海域覆盖的特点和必要性,并通过一个海域覆盖案例说明超远覆盖基站是一种经济实用的解决方式.     

上海金茂大厦给水系统的组成和运行管理

介绍了上海金茂大厦给水系统的构成和实际运行情况,总结了超高层建筑给水设施运行管理和部分设备改造的经验.     

Simulated Annealing and the Generation of the Objective Function: A Model of Learning During Problem Solving

A computational model of problem solving based on significant aspects of human problem solving is introduced. It is observed that during problem solving humans often start searching more or less randomly, becoming more deterministic over time as they learn more about the problem. This two‐phase aspect of problem‐solving behavior and its relation to learning is one of the important features this model accounts for. The model uses an accelerated simulated annealing technique as a search mechanism within a real‐time dynamic programming‐like framework upon a connected graph of neighboring problem states. The objective value of each node is adjusted as the model moves between nodes, learning more accurate values for the nodes and also compensating for misleading heuristic information as it does so. In this manner the model is shown to learn to more effectively solve isomorphs of the Balls and Boxes and Tower of Hanoi problems. The major issues investigated with the model are (a) whether such a simulated annealing‐based model exhibits the kind of random‐to‐directed transition in behavior exhibited by people, and (b) whether the progressive discovery of the objective function, even when given very little or poor initial information, is a plausible method for representing the learning that occurs during problem solving and the knowledge that results from that learning.