钢铁企业产销系统中产销衔接问题及其解决方法

分析产销系统中产销衔接的主要问题,并对解决这些问题的关键技术进行研究。针对小批量多品种与批量生产间的衔接,用户特殊要求与生产过程控制之间的衔接,订单交货期与订单生产开工、完工期之间的衔接以及客户发运地点与产品下线堆垛之间的衔接等提出了相应的解决方法,总结了产销衔接技术的应用效果。     

RFID/WI-FI在冷轧钢卷库物流优化改造中的应用

针对鞍钢天铁冷轧钢卷库在物流管理流程中存在的库位信息紊乱、系统信息实时性不强、吊卷效率不高等问题,分析出其产生的主要原因为吊卷完全依赖地面库管指挥执行,缺少与应用系统之间的直接交互;系统信息通过手工记录后批量更新,实时性不强等。利用RFID和WI-FI技术,增加无线车载终端和电子标签系统,通过对冷轧钢卷库物流的优化和对应用系统程序的改造,实现了冷轧钢卷库的自动化管理,保证了信息及时准确更新,便于生产的实时指挥协调,提高了公司钢卷库物流的效率。     

加热炉装钢系统的应用

加热炉装钢是板坯库至加热炉的“咽喉”。随着钢铁生产厂智能化和数字化水平的不断提高,要求板坯库与加热炉之间要有完整的数据传递同时要确保数据一致。这就需要有一个管理系统来保证信息传递,提高数据准确率,加热炉装钢系统应运而生。介绍了加热炉装钢系统的架构、主要功能和业务实现流程及实现方式。该系统在唐钢新区应用后,自动装坯率达99%;且通过图片自动识别系统,避免了人为造成的装炉错误,提高了装钢效率。     

热轧板坯库MES系统分析与设计

分析钢铁行业MES的特点及作用。介绍了热轧板坯库的生产工艺,板坯库管理系统设计要点,提高板坯物流效率的途径,梅钢热轧板坯库MES系统的软硬件构成及主要的应用功能。系统根据库场实际,设计合理的物流,采用合理的堆放策略,自动产生板坯的入库、倒垛和出库命令,作业命令通过无线网络发送给吊车人工执行,实现了热轧板坯库的高效管理,取得了良好的效果。     

天车无线系统在板坯库中的应用

为了提高板坯库天车作业效率,结合钢铁厂板坯库生产的特点,我们开发了天车无线系统,实现了天车任务的自动编制、下达、分配和执行。本文阐述了天车无线系统的设计思想,包括无线系统架构、网络设置、系统功能等,以及无线系统的实施方案,包括无线网络设计和无线发射站的布置,最后提出了无线设备安装的注意事项。系统在某钢厂上线后,提高了天车作业效率,应用效果较好。     

风电塔筒制作法兰平面度控制研究

本文通过对风电塔筒法兰组装、焊接制作过程,控制法兰平面度对塔筒质量的关键性,研究法兰平面度控制方法,解决了各段连接法兰之间的平面度、平行度与焊接变形之间的矛盾,结果表明:对提高塔筒生产效率和质量要求,具有实际指导意义。     

液压润滑设备状态监控系统研究

液压传动系统具有控制精度高、响应快等优点。本文描述了精锻生产线中液压润滑系统在线监控系统的设计与工程实践,包括系统组成和安装等。实际应用结果表明,该系统满足精锻生产线具有温度高、震动大、污染因素多等工况条件,提高了设备生产效率。     

U形管原理在煤气生产中的应用实践

如何解决煤气连续生产与安全检修之间的矛盾,提高煤气设施的使用效率,确保煤气设备安全运行。本文从公司生产实际入手,剖析公司煤气生产与安全检修的实际情况,提出利用U形管水封原理进行技术改造,在洗涤塔出口处安装U型管路。并成功应用实践,有效的解决了制约煤气连续生产与安全检修的瓶颈问题。     

金属板材轧机高压液压系统故障分析与改进

对于轧机设备而言,高压液压系统是其非常重要的组成部分,一旦高压液压系统出现故障,将会直接影响整个轧机设备的运行效率与质量。因此,在实际的运行过程中,需要加强对轧机高压液压系统的检测与维护力度,对于高压液压系统中所出现的故障,需要采取有效的措施加以解决,从而确保轧机设备具有更高的运行效率和稳定性保障。本文主要对轧机高压液压系统所经常出现故障的解决对策进行了分析研究,以供相关人士参考借鉴。     

数字直流仿真培训系统的结构设计及应用研究

建立企业仿真培训系统对于提高岗位人员的操作素质、提高岗位工作效率、减少事故的发生都具有重要意义。针对基于Web系统具有地理上和系统上的可移动性、界面简洁、管理方便和应用程序集成度高等优点,利用面向对象的软件开发方法、Browser/Server网络架构和Visual C＋＋语言开发了一套数字直流仿真培训系统。实际应用表明,该系统在很大程度上提高了企业职工培训的效率和培训水平,对企业人力资源开发水平的发展起到了很大的推动作用。     

Development of a yeast trihybrid screen using stable yeast strains and regulated protein expression

We describe a yeast trihybrid system that facilitates rapid screening of cDNA libraries. Novel yeast vectors were developed that direct integration of cDNA encoding the bait and third protein component into the yeast chromosome. A recombinant yeast strain is thus generated (screening strain) and is available for library transformation. Transformation with the library DNA is a single, efficient transformation event, allowing the cDNA library to be represented in one step. Recovery of the library plasmid from the yeast is also simplified, since it is the only episomal plasmid. Assay of trihybrid interaction and identification of positive clones is facilitated by regulating expression of the third protein component using the yeast MET3 promoter, which is repressed in the presence of exogenous methionine. Trihybrid interactions are detected only on media lacking methionine. This trihybrid system uses the standard E. coli LacZ and yeast HIS3 reporter genes and is compatible with most available Gal4 activation domain cDNA libraries. We describe the successful application of this yeast trihybrid system to the study of phosphoprotein interactions involved in T-cell signaling.     

终身教育思潮与图书馆未来发展

随着终身教育思潮的兴起 ,作为社会教育系统的一个子系统的图书馆在未来社会中必将发生根本性变化 ,为此图书馆界理应预测图书馆未来发展趋势 ,深入分析当前面临的机遇和挑战 ,制订出切实可行的措施 ,以自身的优势和特色奉献社会。     

基于AutoCAD的自动化系统原理图快速出图系统

在三电系统设计过程中,施工图设计阶段有大量重复性图纸设计工作。针对这一情况进行分析并给出一 种快速出图的解决方案。结合实际项目,开发出一套自动化系统原理图快速出图系统。该系统以AutoCAD为二 次开发平台,利用ActiveX Automation技术和VBA编程语言将前端用户界面、图纸模板库、数据库集成在一起,在 实际应用中效果良好,减少了大量重复性的工作,从而显著提高了制图速度和整体工作效率     

A simple and efficient procedure for generating stable expression libraries by cDNA cloning in a retroviral vector

cDNA expression cloning is a powerful method for the rescue and identification of genes that are able to confer a readily identifiable phenotype on specific cell types. Retroviral vectors provide several advantages over DNA-mediated gene transfer for the introduction of expression libraries into eukaryotic cells since they can be used to express genes in a wide range of cell types, including those that form important experimental systems such as the hemopoietic system. We describe here a straightforward and efficient method for generating expression libraries by using a murine retroviral vector. Essentially, the method involves the directional cloning of cDNA into the retroviral vector and the generation of pools of stable ecotropic virus producing cells from this DNA. The cells so derived constitute the library, and the virus they yield is used to infect appropriate target cells for subsequent functional screening. We have demonstrated the feasibility of this procedure by constructing several large retroviral libraries (10(5) to 10(6) individual clones) and then using one of these libraries to isolate cDNAs for interleukin-3 and granulocyte-macrophage colony-stimulating factor on the basis of the ability of these factors to confer autonomous growth on the factor-dependent hemopoietic cell line FDC-P1. Moreover, the frequency at which these factor-independent clones were isolated approximated the frequency at which they were represented in the original plasmid library. These results suggest that expression cloning with retroviruses is a practical and efficient procedure and should be a valuable method for the isolation of important regulatory genes.     

Object-Oriented Framework for Genetic Algorithms with Application to Space Truss Optimization

Genetic algorithms have been shown to be very effective optimization tools for a number of engineering problems. Since the genetic processes typically operate independent of the actual problem, a core genetic algorithm library consisting of all the genetic operators having an interface to a generic objective function can serve as a very useful tool for learning as well as for solving a number of practical optimization problems. This paper discusses the object-oriented design and implementation of such a core library. Object-oriented design, apart from giving a more natural representation of information, also facilitates better memory management and code reusability. Next, it is shown how classes derived from the implemented libraries can be used for the practical size optimization of large space trusses, where several constructibility aspects have been incorporated to simulate real-world design constraints. Strategies are discussed to model the chromosome and to code genetic operators to handle such constraints. Strategies are also suggested for member grouping for reducing the problem size and implementing move-limit concepts for reducing the search space adaptively in a phased manner. The implemented libraries are tested on a number of large previously fabricated space trusses, and the results are compared with previously reported values. It is concluded that genetic algorithms implemented using efficient and flexible data structures can serve as a very useful tool in engineering design and optimization.     

Departmental libraries: why do they exist?

In response to an increasing concern on the part of the library staff over the role of the departmental libraries at The Milton S. Hershey Medical Center of The Pennsylvania State University, a questionnaire was developed by the George T. Harrel Library and sent to departmental libraries. From the analyzed responses, the authors were able to define the role of departmental libraries in a medical school/hospital situation, to analyze the Hershey Medical Center situation in an objective manner, to outline areas of possible cooperation between the main and departmental libraries, and to delineate some trends which appear to result from inadequate finding of a central library. Overall, the library found that departmental libraries at Hershey are currently maintaining collections consistent with the functional role of a departmental library.     

图书馆文化在图书馆发展中的若干思考

文章就图书馆文化在图书馆建设发展中的定位、特征、作用等进行考量,力图说明图书馆文化不仅服务于图书馆建设发展,更是图书馆建设发展的精神动力。     

冶金球团用膨润土性能指标的探讨

为了配合在冶金球团行业推广应用新的膨润土国家标准,通过对我国十七个省(自治区)膨润土产地100多个样品的检测和研究,探讨了膨润土各性能指标的意义、特征、相互关系以及影响因素;阐明了新国标中将吸水率作为膨润土首要指标的合理性;指出了膨胀指数和吸水率一样,是表征膨润土同一性能的两个指标;提出膨胀容虽然在新国标中被废除,但它能在一定程度上反映膨润土在球团生产中的作用,因此可能有保留的必要。