关于m—增生算子的连续扰动的映射定理

在实Banach空间中证明了具有紧豫解式的m—增生算子连续扰动的几个映射定理，它们改进了文献［1］和［3］中的部分结果。     

示波极谱法连续测定锌中铅、镉含量

该分析方法是将锌样品经盐酸处理后,在动物胶、盐酸、氯化钾按一定比例配制的盐酸底液中,用1％抗坏血酸除氧,然后在示波极谱仪上于—0.2V～—0.8V的原点电位处,选择适当电流倍率进行铅、镉的同时测定。     

钢水密度对中间包流场影响的数模研究

利用数模研究了钢水在常密度和密度变化两种条件时，中间包内的流场、温度场和钢水平均停留时间．计算结果说明高温钢水在中间包内流动时，不能忽略自然对流流动，密度随温度变化时，钢水沿着液面流到水口区，没有短路流现象，最短滞流时间150s，进出口温差46℃，其流场和温度场与常密度条件下的正好相反．     

连铸矩形坯二次冷却水系统的工艺方案

以上钢三厂1#连铸机二次冷却系统改造为研究对象，应用连铸工艺理论，结合该厂多年实际生产经验研制了矩形坯连铸机二次冷却水系统的工艺方案，其中配水模式的确定、配水参数的处理充分体现出工程化的思想．经一年半的实际生产验证，本方案是成功的，给工厂带来了良好的经济效益．     

On periodic resource scheduling for continuous-media databases

The Enhanced Pay-Per-View (EPPV) model for providing continuous-media services associates with each continuous-media clip a display frequency that depends on the clip's popularity. The aim is to increase the number of clients that can be serviced concurrently beyond the capacity limitations of available resources, while guaranteeing a constraint on the response time. This is achieved by sharing periodic continuous-media streams among multiple clients. The EPPV model offers a number of advantages over other data-sharing schemes (e.g., batching), which make it more attractive to large-scale service providers. In this paper, we provide a comprehensive study of the resource-scheduling problems associated with supporting EPPV for continuous-media clips with (possibly) different display rates, frequencies, and lengths. Our main objective is to maximize the amount of disk bandwidth that is effectively scheduled under the given data layout and storage constraints. Our formulation gives rise to -hard combinatorial optimization problems that fall within the realm of hard real-time scheduling theory. Given the intractability of the problems, we propose novel heuristic solutions with polynomial-time complexity. We also present preliminary experimental results for the average case behavior of the proposed scheduling schemes and examine how they compare to each other under different workloads. A major contribution of our work is the introduction of a robust scheduling framework that, we believe, can provide solutions for a variety of realistic EPPV resource-scheduling scenarios, as well as any scheduling problem involving regular, periodic use of a shared resource. Based on this framework, we propose various interesting research directions for extending the results presented in this paper. Received June 9, 1998 / Accepted October 13, 1998     

The multimedia multicasting problem

This paper explores the problems associated with the multicasting of continuous media to support multimedia group applications. The interaction between multicasting and the delivery of multiple time-correlated continuous-media streams with real-time delay requirements poses various new and interesting problems in research on communication protocols and architectures. We describe these problems, and identify where the opportunities are for effective solutions, all in the context of providing an overview of the current state of research in multimedia multicasting. The issues we discuss include quality of service, resource reservations, routing, error and traffic control, heterogeneity, and the use of hierarchical coding and open-loop control techniques.     

高碳钢铸坯偏析的研究

选择连铸各种工艺参数组合，跟踪高碳钢铸坯质量，研究其偏析情况，确定最佳工艺参数，最大限度减轻偏析，提高产品质量。     

One-Dimensional Continuous-Time Quantum Walks

We survey the equations of continuous-time quantum walks on simple one-dimensional lattices, which include the finite and infinite lines and the finite cycle, and compare them with the classical continuous-time Markov chains. The focus of our expository article is on analyzing these processes using the Laplace transform on the stochastic recurrences. The resulting time evolution equations, classical vs. quantum, are strikingly similar in form, although dissimilar in behavior. We also provide comparisons with analyses performed using spectral methods. PACS: 03.67.Lx     

辊套材料对铸轧区磁感应强度影响的实验研究

电磁场快速铸轧技术要求辊套材料不仅具有高导热系数、高承载能力和高抗疲劳能力，而且要具有磁场控制能力，保证铸轧区足够的磁感应强度，达到细化晶粒、改善板坯组织性能的目的．本文主要从介质对电磁场的集肤效应、涡流效应、磁场衰减以及屏蔽效应的角度，研究辊套对铸轧区电磁场的影响．     

引进冷连轧机厚控系统分析及改进方案

武钢、宝钢两套冷连轧机代表了冷连轧技术发展水平 ,用连轧张力理论对这两套冷连轧机的厚控系统作了深入的分析、讨论 ,给出了其中最主要厚控环节 -连轧AGC和张力AGC的数学模型。对宝钢厚控系统提出了改进方案 ,利用DAGC可以简便地实现穿带、正常轧制、抛尾 ,而不用分别采用APC、恒压力、压力AGC三种控制方式 ,并且DAGC实现恒压力控制有更高的稳定性。