冶金石灰窑燃烧过程模糊预测控制策略应用

冶金石灰窑燃烧温度和进程的控制是保证产品质量的关键,由于它属于非线性、大滞后的热工过程被控对象,常规的PID和Fuzzy以及单纯的预测控制方法难以达到满意的效果.通过对其煅烧过程涉及的物理和化学反应机理分析,阐述了石灰窑生产系统的非线性、多变量和多参数影响的复杂特性以及系统的控制目标,并根据仿真要求对燃烧控制系统的数学模型进了参数辨识.在此基础上,采用预测控制和模糊决策相结合的控制方案,通过仿真分析验证控制算法的有效性,并以工业现场套筒石灰窑为应用对象,投入实际控制运行,取得了良好的效果.     

基于WZ-2188超声波流量计煤气流量检测及其补偿中的应用

根据梅山钢厂石灰窑现有采用孔板流量计测量煤气流量所存在的问题,提出了一种基于WZ-2188超声波流量检测为基准,结合孔板流量计流量检测的双重检测方法,实现了石灰窑供气系统煤气流量的准确测量,并以此为基础实现煤气流量在线补偿。此补偿方法对于采用孔板流量计测量煤气流量的套筒石灰窑均适用。     

套筒式石灰窑温度的模糊控制策略和分析

本文简要地介绍套筒式石灰窑的工艺,研究了套筒窑燃烧室温度设定的经验方程和下燃烧室温度的数学模型,并设计以下燃烧室温度为优化控制目标的多模式控制.研究和仿真结果表明,以套筒窑温度控制进而控制烧成石灰质量是可行的.     

变频器在石灰窑控制系统中的应用

介绍了变频器在气烧石灰窑系统的应用,分析了气烧石灰窑的特点、变频器的参数应用以及项目实践中遇到的问题.     

装配式混凝土结构套筒灌浆连接偏差仿真

为有效监测装配式混凝土结构套筒灌浆连接质量,针对装配式混凝土结构套筒灌浆连接偏差展开仿真.以单独套筒制备A组两个试件A1、A2,以混凝土和套筒制备B组两个试件B1、B2,在各试件相同位置粘贴压电片,并选用均方根(RMS)、均方根偏差(RMSD)及协方差(Cov)作为评估套筒灌浆饱满度缺陷的指标进行仿真,仿真中,运用压电阻抗技术采集各试件压电片五种灌浆工况下的电导信号,依据所采集的电导信号运算出各试件压电片电导的Drms值、RMSD值与Cov值,通过运算结果得出,B1试件的实际灌浆饱满度最高,A1试件的实际灌浆饱满度最低,B1试件的套筒灌浆连接偏差最小,A1试件的套筒灌浆连接偏差最大.     

ABBAC500系列PLC在石灰窑监控系统中的应用

本文介绍了ABBAC500系列PLC在石灰窑监控系统中的应用。该PLC用于对现场仪表进行数据采集和处理,并实现对现场机械设备的连锁自动控制。此外,iFIX作为一种标准的人机界面（HMI）组态软件,被用于监控石灰窑生产的动态过程。     

JAGUAR工业称重终端在石灰窑配料系统中的应用

0 引言石灰窑是氨碱法制碱重要设备之一,它将石灰石进行煅烧,供给制碱所需的优质石灰与合格的窑气.某碱业公司现有6座石灰窑,从1996年5月使用Met-tler-ToedO Jaguara 业称重终端做为配料生产的关键配料设备,从而使石灰窑配料系统更趋完善.1 石灰窑配料工况及要求1.1 石灰窑配料工况石灰窑配料斗下部装有Mettler-Toledo称重模块3个,各个模块的量程范围为2t,3个模块分别为浮动式、半浮动式、固定式,料斗为方形,安装位置见图1.     

施耐德Vijeo Citect项目合并功能在八钢石灰窑系统改造中的应用

介绍施耐德Vijeo Citect软件在合并八钢石灰窑1、2期项目中的应用,阐述其包含工程功能的结构特点及网络组态配置等综合应用。     

新型石灰窑自动化控制生产线

现代新技术石灰窑就是具有环保、节能功能和机械化、自动化程度较高的现代化石灰窑,采用DCS作为核心控制系统,实时监控并调节控制参数,实现石灰窑生产线的可靠和安全。     

基于有限试验数据与流场仿真的套筒阀流量特性获取方法

为提高大口径套筒阀流量特性的获取效率以及准确性,提出一种基于有限试验数据与流场仿真分析相结合的套筒阀的流量特性获取方法。通过对套筒阀进行三维建模并以此建立流场仿真模型,以有限试验数据为参考对该模型进行优化使得仿真结果满足精度要求,进而通过流场仿真计算获取套筒阀的完整流量特性插值表。与目前常用的试验数据处理方法相比,该方法有效减少了对试验数据的需求量并保证了仿真精度。通过验证对比,以该方法获取的流量特性来计算的仿真流量与实际测量流量相比,最大误差不超过8%。     

Three‐dimensional printing technologies for terahertz applications: A review

Three‐dimensional (3D) printing technologies enables fast prototyping of complex 3D objects with ever improving printing qualities. To date, 3D printing has been found useful in areas such as manufacturing, industrial design, aerospace, dental and medical industries, and many others. In this article, we review recent advances of 3D printing technologies for terahertz (THz) applications. Different 3D printing technologies and printable materials are first discussed and compared. 3D‐printed THz components and devices, which are categorized as waveguides/fibers, antennas, and quasi‐optical components, are further demonstrated. It is found that the performances and functionalities of 3D‐printed THz devices have been greatly enhanced, while the operating frequencies have been increased from the lower end of THz range to over 1 THz region. With further development of novel materials and printing techniques, it is believed that 3D printing technologies will play an important role in the realization of THz components for efficient control and manipulation of THz waves.     

芳烃系列装置生产方案的整体优化模拟

利用化工模拟软件,打破装置界区限制,从混合芳烃原料出发。以最终芳烃产品为目标,对现有的重整车间芳烃分离装置、特种溶剂油车间的重芳烃分离装置,以及苯酐车间的邻二甲苯分离装置进行多方案全流程模拟、并调整设备及流程顺序,进行整体优化,推出节能流程,在投资很小的情况下,降低能耗40％以上,取得了可观的经济效益。     

See in 3D: state of the art of 3D display technologies

With advances in lasers, optics, and electronics, many new 3D display technologies have been proposed with prototypes in research labs or have entered the marketplace. Although some of these technologies (such as Stereoscopy) are familiar to people, other technologies, such as holography, remain far-fetched to most. This survey introduces the principles of current popular 3D display technologies, which are generally categorized into four categories: 3D movies, on-stage holograms, holographic projections and volumetric 3D displays. Furthermore, the limitations of each of the aforementioned technologies are deeply analyzed, and comparisons of these technologies are provided. Moreover, we note appropriate application situations for the various technologies. Because computer-generated hologram (CGH) technologies are considered to be the next generation of 3D display technology and have become a dominant direction in 3D display technology development, we address the challenges that CGH is currently facing and provide an insightful analysis of solutions proposed in recent years. Finally, we study the current 3D display applications associated with the four categorized technology principles.     

Optimal data placement on disks: a comprehensive solution fordifferent technologies

The problem of optimally placing data on disks (ODP) to maximize disk-access performance has long been recognized as important. Solutions to this problem have been reported for some widely available disk technologies, such as magnetic CAV and optical CLV disks. However, important new technologies such as multizoned magnetic disks, have been recently introduced. For such technologies no formal solution to the ODP problem has been reported. In this paper, we first identify the fundamental characteristics of disk-device technologies which influence the solution to the ODP problem. We develop a comprehensive solution to the problem that covers all currently available disk technologies. We show how our comprehensive solution can be reduced to the solutions for existing disk technologies, contributing thus a solution to the ODP problem for multizoned disks. Our analytical solution has been validated through simulations and through its reduction to the known solutions for particular disks. Finally, we study how the solution for multizoned disks is affected by the disk and data characteristics     

Sharing with people: a system for user-centric content sharing

In this paper, we present the existing content sharing paradigms along with some advanced sharing use cases that are not feasible with the existing technologies. For satisfying these use cases, we propose a new system that allows content sharing in a totally user-centric manner, meaning that users can select the people they want to share their content with and just let the system handle all the lower level device, network bearer and content transfer technologies, which best fit each sharing occasion. The system feasibility is proved in two dimensions, firstly by a technical prototype implementation in a laboratory environment, and secondly via usability studies with non-expert users, for gathering their input and feedback on the interface and preferred interaction with such a system.     

A Survey of Application Layer Techniques for Adaptive Streaming of Multimedia

Though the integrated services model and resource reservation protocol (RSVP) provide support for quality of service, in the current Internet only best-effort traffic is widely supported. New high-speed technologies such as ATM (asynchronous transfer mode), gigabit Ethernet, fast Ethernet, and frame relay, have spurred higher user expectations. These technologies are expected to support real-time applications such as video-on-demand, Internet telephony, distance education and video-broadcasting. Towards this end, networking methods such as service classes and quality of service models are being developed. Today's Internet is a heterogeneous networking environment. In such an environment, resources available to multimedia applications vary. To adapt to the changes in network conditions, both networking techniques and application layer techniques have been proposed. In this paper, we focus on the application level techniques, including methods based on compression algorithm features, layered encoding, rate shaping, adaptive error control, and bandwidth smoothing. We also discuss operating system methods to support adaptive multimedia. Throughout the paper, we discuss how feedback from lower networking layers can be used by these application-level adaptation schemes to deliver the highest quality content.     

HISPF智能构件管理器的研究

构件管理器是医疗卫生机构信息系统应用平台HISPF的重要组成部分,其基本思想采用构件理论与技术结合人工智能理论实现了对构件库的编辑,通过刻面分类技术对构件进行聚类以实现构件的分类存储及目录库的管理。该文对其基本原理、关键技术进行了讨论。     

并行计算机高可用性分析与设计

随着并行计算机系统规模的不断增大,系统的失效率呈线性增长。如何保证大规模并行系统能够提供持续不断的服务,即提高系统的可用性,达到高可用的目标,已成为并行系统设计的重要方面。系统级容错的概念目前已经提出,但系统可用性的度量仍然需要深入研究。本文运用组合模型和马尔科夫过程模型,对系统可靠性和可用性进行了建模模和分析,推导了基于马尔科夫过程的可用性度量公式,得出运用高可用技术可以提高系统的可用性。在此基础上,还给出了一个大规模并行计算机系统的高可用系统结构。     

Digital tools and challenges to institutional traditions of learning: technologies, social memory and the performative nature of learning

The purpose of this article is to offer some reflections on the relationships between digital technologies and learning. It is argued that activities of learning, as they have been practised within institutionalized schooling, are coming under increasing pressure from the developments of digital technologies and the capacities to store, access and manipulate information that such resources offer. Thus, the technologies do not merely support learning; they transform how we learn and how we come to interpret learning. The metaphors of learning currently emerging as relevant in the new media ecology emphasize the transformational and performative nature of such activities, and of knowing in general. These developments make the hybrid nature of human knowing and learning obvious; what we know and master is, to an increasing extent, a function of the mediating tools we are familiar with. At a theoretical and practical level, this implies that the interdependences between human agency, minds, bodies and technologies have to serve as foundations when attempting to understand and improve learning. Attempts to account for what people know without integrating their mastery of increasingly sophisticated technologies into the picture will lack ecological validity.     

Digital forensics and the issues of identity

The issue of what we consider to be the identity of a person has become increasingly complex as we have made ever greater use of the facilities and services that have been made available by developing technologies and the Internet. In the past people normally had one identity, while in the current environment it is acceptable to maintain separate ‘identities’ for different aspects of our on-line interactions.Proving beyond a reasonable doubt that an individual that is suspected of a crime that is based on the technologies that we increasingly rely on was the actual perpetrator has always been problematic. It is relatively easy to determine the device that was used, but proving that the suspect was the person that used it has always been more difficult.This paper looks at a range of issues that have affected what we consider to be reasonable proof of identity and a number of the problems that this causes in identifying the perpetrator of a crime.