连续式超临界流体萃取进卸料装置

概括了超临界流体萃取技术和包括连续式操作在内的超临界流体萃取装置的研究现状 ,提出了一种通过球形进、卸料器完成固相物料超临界流体萃取连续化进卸料的装置 ,介绍了该装置的结构和工作原理 ,给出装置中各主要部件的计算方法。     

储罐负压排泥技术

油田每年都有大量的储罐需要进行清罐排泥作业,通过对几种常用排泥方法的比较,认为负压排泥装置具有安装简单,操作方便,排泥效率高,排泥费用低等特点,文章详细介绍了储罐负压排泥装置的结构、原理以及安装与操作方法,并提出负压排泥装置使用的注意事项。     

对主要钢铁企业集团规模经营和全球化经营情况的分析

概述了在全球范围内广泛，激烈的市场竞争中，世界主要钢铁企业抓住机遇进行战略性兼并的情况；分析指出了规模经营和全球化经营是是钢铁企业做大做强，占领国际市场份额的必然趋势。     

修井作业中的自动起下管柱系统探讨

目前在油田修井作业中起下管柱的人工作业量大、工作效率低、危险性大、工作条件差。提出了一种自动起下管柱作业系统,主要包括通井机、井架、液压钳、筒式吊卡、卡瓦支座、立式排管架和控制系统等,支座卡瓦为弹性体微条嵌入式结构,筒式吊卡能自动卡入和松开管柱接箍,排管架可实现管柱的立式排放,控制系统协调各部分的工作。该系统构思新颖,结构简单,技术可行,并能够与现有修井设备配合使用,实现油田修井作业的自动化。     

碘量法测铜中物质性质和分析操作

本文讨论了碘量法测定铜量中一些有关物质的特性,以及这些性质对分析条件和操作的要求。     

推拉式浅槽盐酸酸洗工艺的操作经验

介绍了带钢推拉式浅槽紊流盐酸酸洗各工序的操作经验,并提出了建议。     

A frame-based knowledge representation model and its mapping to nested relations

The first part of this paper introduces the basic constructs of a frame representation model and gives a formal definition for them. Subsequently the nested relational model (NF²) is described as an extension of the classical relational model to support relation-valued attributes. In the second part of this paper both models are compared with each other and a mapping of frame representation structures to NF² structures is specified. The structural similarities between frames and NF² relations are made clear and it is shown that their main difference is due to the type polymorphism introduced by the concept hierarchy of the frame model. This causes type collisions to occur in the strictly typed NF² model when frames are directly mapped to NF² structures. Two solutions to this problem are suggested and compared. The paper concludes with a reformulation of query operations of the frame model in terms of NF² algebra operations.     

莱钢职业安全健康动态监控信息系统的建立及运行分析

以网络技术和信息技术为依托，建立职业安全健康动态监控信息系统，进行职业安全健康管理的监控和预警，提高安全管理的现代化水平。     

Survivability of systems under multiple factor impact

The paper considers vulnerable multi-state series-parallel systems operating under influence of external impacts. Both the external impacts and internal failures affect system survivability, which is determined as the probability of meeting a given demand. The external impacts are characterized by several destructive factors affecting the system or its parts simultaneously.In order to increase the system's survivability a multilevel protection against the destructive factors can be applied to its subsystems. In such systems, the protected subsystems can be destroyed only if all of the levels of their protection are destroyed.The paper presents an algorithm for evaluating the survivability of series-parallel systems with arbitrary configuration of multilevel protection against multiple destructive factor impacts. The algorithm is based on a composition of Boolean and the Universal Generating Function techniques.Illustrative examples are presented.     

一些两段式煤气发生炉运行情况分析

两段式发生炉具有产生煤气热值较高，生产能力较大，稳定性较好等优点，目前在一些大中型企业运行良好。本文总结了一些两段炉操作运行情况，也指出了存在的一些问题，诸如煤气脱硫处理不当、停炉停产检修需调整以及应用计算机自动控制方面等问题有待于解决，最后提出一些建议。