全PLC控制系统在天钢高炉中的应用

介绍天钢东移 2 0 0 0m3 高炉基础自动化控制系统及其网络配置 ,根据所配系统特点在软件编制中建立了相应的标准功能块和精灵库。经联调证明 ,这种方法提高了软件工作效率 ,保证了PLC功能块和画面组态的一致性。     

微探鲁迅散文诗主《野草》中的传统意象

意象作为中国传统美学的常用术语,被评论界广泛地解释诗歌的文本特征.散文诗将诗歌与散文的特点相结合,在意象上具备了独特的美学特质:散文诗能够灵活、创造地使用语言,将散文美发挥得淋漓尽致.鲁迅文学核心有"吃人"、"沉默"与"荒原"三种意象,在<野草>中,也存在着三大意象:"美丽的精灵"、"冷硬讥诮的喜剧场"与"地火奔突的荒原之夜".     

Vijeo Citect与Quantum PLC以太网通信

本文主要介绍了施耐德Quantum PLC和施耐德上位监控软件Vijeo Citect进行以太网通信配置。阐述Vijeo Citect应用软件特点和功能配置,以及Quantum PLC通过以太网与上位机通讯的方法。稳定的以太网连接配置,能够可靠的保证生产稳定性和有效地监控设备运行状态和故障检测。     

Citect监控软件在中板厂的应用

介绍了Citect的特点以及该软件在中板厂的使用情况。     

GE90-30PLC及Citect监控软件在转炉中的成功应用

本文介绍Citect监控软件在转炉控制系统成功应用，简述PLC主要控制模块以及在铜转炉中如何进行控制的，值得在同行业中推广应用。     

CITECT软件在南钢EMS系统中的应用

介绍了组态软件Citect5.5的功能,并根据能源管理系统功能的特点,详细阐述了EMS系统的组成、软硬件配置、数据通信方式、监控组态软件的设计、实现TEXT数据文件生成以及文件传递。     

CitectSCADA与APC在智慧制造的应用

为提高八一钢铁制氧分厂控制系统自动化程度,将原有6套空分上位程序通过Citect重新整合,空分装置DCS通过APC先进控制实现节能降耗,降低操作人员劳动强度,提高设备利用率和产量。     

OPC技术在石灰网络通讯中的应用

阐述了利用OPC(OLE for process control)接口来实现Win CC与Citect之间动态数据共享,解决了宁波钢铁有限公司(以下简称宁钢)炼钢厂石灰与能源中心、环保中心等网络之间的通讯安全问题。     

悉雅特召开中国地区重要合作伙伴会议

11月初,澳大利亚悉雅特集团在杭州西子湖畔召开了“2004年中国地区重要合作伙伴会议”。本次会议邀请了集团在中国地区的100多家系统集成商、分销商及设计院的合作伙伴。会议主要内容包括:Citect6.0及P2B讲解、MOX系列硬件产品演示、同类产品比较、Citect道路图、MOX路图、悉雅特中国发展蓝图、典型案例分析以及合作交流探讨等。在为期两天的会议中,与会来宾从专家们深入浅出的讲解和演示中对悉雅特的产品有了更深层次的了解,同时通过彼此之间坦诚的交流与探讨,更加强了悉雅特公司与合作伙伴之间精诚合作的紧密关系。在会议最后一天举…     

基于串口服务器的环境保护在线监测系统

基于MOXA串口服务器的监控系统,利用串口服务器将RS232接口的数据转化为IP端口的数据,通过OA主干网络将分散的数据采集到数据服务器中,并采用Citect软件作为上位检测软件,对废水废气在线监测数据进行实时监控,同时支持有权限用户通过济钢网络以Web方式查看废水废气排放情况。实际运行证明系统稳定可靠。     

逐层变流量堆料系统的研究与开发

为提高原料的混匀效果，建立了逐层变流量堆料系统的数学模型，在此基础上开发了控制系统；并对其关键工艺和工作原理进行了讨论。使用本系统后原料混匀效果得到改善，中和料质量、烧结产量和质量指标均得到提高。     

自动加水系统在莱钢烧结厂的应用

莱钢型钢烧结厂混料采用自动加水系统,系统包括计算机、水分仪、皮带秤、流量计等设备,软件采用了Vijeo Citect画面编辑软件和Unity Pro编程软件,数据库采用SQL Serve2000。该自动加水系统应用后,混合料水分稳定率高达95%以上,操作人员从原先的4人减少到1人,加水误差从原来的25%降低到0.1%,烧结生产过程得到稳定和强化。     

Intracranial abnormalities in infants treated with extracorporeal membrane oxygenation: update on sonographic and CT findings

The phylogenetic relationship of the asexual mycorrhizal fungus Cenococcum geophilam Fr. among sexual ascomycetes was examined by phylogenetic analysis of nucleotide sequence data from the nuclear small subunit (18S) ribosomal RNA genie region. A specific focus of this study was to test the hypothesis that the genus Elaphomyces is the closest sexual relative of C. geophilum. Thus nucleotide sequence data of five C. geophilum isolates, three Elaphomyces species, and 44 additional genera of ascomycetes were included in the phylogenetic analyses. The percentage of similarity among the 18S rDNA sequences of the C. geophilum isolates examined was 99.8 to 100%, indicating that C. geophilum is monophyletic. Percent similarity of nucleotide sequence among the three Elaphomyces species was also high and ranged from 99.4 to 99.5%. DNA parsimony and distance analysis of the sequence data separated these 2 genera on distant clades when sequence from 44 additional genera of ascomycetes was included. Parsimony and distance analyses positioned C. geophilum as a basal, intermediate lineage between the two Loculoascomycete orders, the Pleosporales and the Dothidiales, and strongly supported Elaphomyces to be of Plectomycete origin. Among the sexual Ascomycetes examined, which included representative taxa from four classes of filamentous Ascomycetes (Plectomycetes, Pyrenomycetes, Discomycetes, and Loculoascomycetes), no close sexual relative to C. geophilum was identified. At least four independent lineages of mycorrhizal fungi were identified among the ascomycetes examined.     

扫描电镜夹杂物自动分析功能在钢材上的应用

非金属夹杂物是影响钢材质量性能的主要因素之一,扫描电镜夹杂物自动分析是检验钢中夹杂物的常用手段,具有操作自动化程度高、检测结果数据量丰富的优势。实验利用该功能检验了铝、硅、锰复合脱氧的某低碳低合金钢中间包钢水样品和盘条样品,以案例方式介绍了检验结果中主要数据的利用：用元素含量断定夹杂物的成分和类型,实验中为MnS和各种氧化物;当量直径(ECD)可用于分析尺寸,再综合数量信息,可评价钢质洁净度水平以及指导优化夹杂物控制技术,实验中中间包钢水样品和盘条样品上夹杂物ECD平均值分别为1.89μm和1.14μm,前者远大于后者,而前者夹杂物密度则小于后者;按类型,硅酸盐和硅铝酸盐型夹杂物是实验中最主要的两类氧化物夹杂,其中前者尺寸略小,ECD平均约1.005μm,后者数量最多,盘条样上占比超50%;依据检验结果还可定位夹杂物位置,实验中两类样品上各类型夹杂物均随机分布;轧制过程中夹杂物随尺寸增大而变形增大,随着其分布位置由基体边部到心部,变形先增大后减小,硫化物长宽比大于氧化物,钙改质的氧化物大于未改质前。     

Aspects of Technological Development of Wind Turbines

The wind turbine technology has a unique technical identity and unique demands in terms of the methods used for design. Remarkable advances in wind power design have been achieved due to modern technological developments. Since 1980, advances in aerodynamics, structural dynamics, and “micrometeorology” have contributed to a five percent annual increase in the energy yield of the turbines. Current research techniques are producing stronger, lighter, and more efficient blades for the turbines. The annual energy output per turbine has increased enormously and the weight of turbine and the noise they emit have been halved over the last few years. The deployment of modern wind turbines has resulted in experience in the production and use of wind turbines, which has led to improved turbines and reduced cost of wind-generated electricity. The paper reviews the research and development of technology of wind turbines and its impact on the cost of wind energy systems. Also the important gaps between the theoretical research and practical implementation have been analyzed and the problems associated with this have been discussed. The need and areas for further research and development effort have also been outlined.     

载金炭解吸电解工艺方法的分析比较

对近二十年来载金炭解吸电解工艺的三种方法进行了比较，即第一种加温常压解吸电解方法，尽管解吸时间比第二种高温高压解吸电解方法时间长，生产效率低，但由于其设备投资少，成本低，目前仍可适用于小型黄金矿山；采用第二种方法具有生产能力大，解吸效果好等许多优点，比较适用于大，中型黄金矿山；而第三种解吸电解方法介于前二种之间。     

Q345D钢中含钙类夹杂物的演变和生成机理分析

 通过工业实践研究Q345D钢生产过程含钙类夹杂物的演变和生成机理,并结合热力学计算研究了夹杂物凝固过程的转变机理。结果表明,钢中钙主要来源于VD真空冶炼和钙处理;真空前夹杂物CaO含量很低,破空后夹杂物CaO含量开始升高;之后由于钙处理,夹杂物CaO含量进一步升高。钢液冷却凝固过程中夹杂物发生明显转变,铸坯夹杂物中CaO含量明显降低,CaS含量显著升高,其结果与FactSage热力学计算结果一致。铸坯大尺寸含钙夹杂物主要分为钙铝酸盐、CaS包裹钙铝酸盐、CaS包裹钙铝酸盐且中间析出尖晶石、CaS和Al₂O₃黏结型及CaS和尖晶石黏结型;统计表明,铸坯中夹杂物尺寸越大,夹杂物中CaO含量越高,大尺寸夹杂物中CaS含量极低。     

Drainage of Ponded Surface by an Array of Ditches

A comprehensive analytical solution for the quantity of seepage into an array of fully penetrating ditches from a ponded surface has been obtained using hodograph and Schwarz–Christoffel transformation. The solution includes equations for the quantity of seepage from the seepage face part as well as the water depth part of the ditch. The solution also comprises expressions for the velocity potential at the stagnation point and the variation in seepage velocity. The variation in seepage quantity is like the shape of a curved channel whose boundary maps along a circle onto the hodograph plane. This shape is average of a semiellipse and a parabola. The seepage contribution from the nonseepage face is maximum for half full condition and it is half of the total seepage in an empty ditch (full seepage face). Irrespective of the spacing between ditches the quantities of seepage from the seepage face part and the nonseepage part are equal for one third full ditch. The solution also deals with special cases like single ditch, unequal spacing between ditches, and unequal depth of water in adjacent ditches. The expressions the quantity of seepage have been simplified in explicit algebraic equations through minimization of errors. The simplified expressions, which are near exact, result in answers in single step computations. Also, an example and graphs have been included to demonstrate the sensitivity of the parameters.     

方坯软接触电磁连铸结晶器内钢液磁场分布数学模型

摘要：通过构建方坯软接触电磁连铸结晶器内钢液磁场分布的数学模型,研究了钢液内磁场分布不均的特性,模拟了结晶器内不同切缝形式、磁场频率及液面高度等参数在渣膜存在的条件下对结晶器内钢液磁场分布的影响规律,并进行了模型验证。结果表明,铜壁对磁场的反射作用导致了切缝内的磁场叠加现象。渣膜的存在有利于改善钢液内磁场的均匀性。切缝应设计为下窄上宽型,尽量保持切缝长度在180~200mm、宽度在0.8~1.0mm,并多开切缝。磁场频率升高不利于钢液内磁场的均匀性,应尽量保持在20~30kHz。钢液面升高有助于改善钢液内磁场的纵向均匀性,合理的液面应尽量控制在线圈中心偏上位置。     

氧化物冶金在高强度低合金钢生产中的试验研究

通过对氧化物冶金技术在高强度低合金钢生产中的试验研究,探索采用氧化物冶金技术冶炼过程中转炉终点及LF精炼过程钢中的氧含量控制、正确的脱氧方式、脱氧合金元素的加入时机等,通过调节钢液成分,确保形核诱导粒子的生成;同时,利用扫描电镜分析了钢中夹杂物的成分、形貌、尺寸及夹杂物周围的组织形貌,并对试验钢板的性能进行了取样检测。结果表明,试验炉次氧化物冶金的效果良好且试验钢板性能很好。