电子级过氧化氢的质量标准、市场和生产技术

介绍了目前电子级过氧化氢的质量标准;分析了市场状况及其发展趋势;简述了工业生产中常用的几种生产方法.     

合成氨催化剂的生产和技术

介绍了世界合成氨催化剂发展历程、新开发的合成氨催化剂种类 ,同时评述了我国化肥催化剂研发和生产近况 ,对我国化肥催化剂性能进行了评价。     

Modeling alternative zoning strategies in forest management

To satisfy public demands for environmental values, forest companies are facing the prospect of a reduction in wood supply and increases in costs. Some Canadian provincial governments have proposed intensifying silviculture in special zones dedicated to timber production as the means for pushing out the forest possibility frontiers. In this paper, we compare the traditional two‐zone land allocation framework which includes ecological reserves and integrated forest management zones with the triad — a three‐zone scheme which adds a zone dedicated to intensive timber production. We compare the solutions of the mixed‐integer linear programs formulated under both land‐allocation frameworks. We explore through sensitivity analysis the conditions under which the triad regime can offset the impact on timber production from increased environmental demands. We show that under the realistic conditions characteristic to Coastal British Columbia, higher environmental demands may be satisfied under the triad regime without increasing the financial burdens on the industry or reducing its wood supply. This occurs, however, only if regulatory constraints in timber production zone are flexible.     

A multi-agent architecture for dynamic scheduling of steel hot rolling

Steel production is a complex process and finding coherent and effective schedules for the wide variety of production steps, in a dynamic environment, is a challenging task. In this paper, we propose a multi-agent architecture for integrated dynamic scheduling of the hot strip mill (HSM) and the continuous caster. The scheduling systems of these processes have very different objectives and constraints, and operate in an environment where there is a substantial quantity of real-time information concerning production failures and customer requests. Each process is assigned to an agent which independently, seeks an optimal dynamic schedule at a local level taking into account local objectives, real-time information and information received from other agents. Each agent can react to real-time events in order to fix any problems that occur. We focus here, particularly, on the HSM agent which uses a tabu search heuristic to create good predictive–reactive schedules quickly. The other agents simulate the production of the coil orders and the real-time events, which occur during the scheduling process. When real-time events occur on the HSM, the HSM agent might decide whether to repair the current schedule or reschedule from scratch. To address this problem, a range of schedule repair and complete rescheduling strategies are investigated and their performance is assessed with respect to measures of utility, stability and robustness, using an experimental simulation framework.     

Investigation of the use of ram horn hydrolysate for fungal protein production

Production of the fungus Aspergillus niger NRRL 330 was studied in submerged fermentation with ram horn hydrolysate (RHH) as substrate. The characteristics of RHH have been reported previously. The RHH was enriched by addition of glucose and KH₂PO₄. The effects of kinetic parameters on the biomass yield of the fungus were investigated. The optimal conditions for growth of A niger on RHH were initial pH 6.5, temperature 30 °C, fermentation time 96 h and agitation speed 150 rpm. Under these optimal conditions the initial carbohydrate content of RHH was reduced from 1.52 to 0.2% and the biomass yield was 8.9 g l^?1. The biomass contained about 48.1% protein, 5.2% fat and 9.4% ash (on a dry weight basis). The amino acid content of the biomass was compared with Food and Agricultural Organisation (FAO) and animal feed standards. The protein produced contained all the essential amino acids for animal feed, but the amounts of these amino acids were somewhat lower than those of FAO and soybean reference protein. However, the amino acid composition of the biomass was better than that of animal feed. The results with RHH were also compared with previously reported data on fungal mycelium grown on waste liquor substrate. In conclusion, it was found that RHH could be used as a substrate in the production of fungal protein for use as animal feed. Copyright © 2003 Society of Chemical Industry     

重整机理模型在生产计划中的应用研究

炼油厂在安排全厂生产计划时，一般依据装置的经验数据来安排生产。本文用重整模拟软件为生产计划提供Delta-Base数据，探讨重整机理模型在生产计划安排生产中的应用。研究结果表明，重整机理模型能够为生产计划提供合理而可靠的Delta-Base数据。     

合金钢连铸机生产工艺分析及实践

对新钢特殊钢有限责任公司整个合金钢连铸机的生产工艺进行了分析，提出了提高钢水质量和优化连铸工艺参数的有效措施，使铸坯的质量得到了有效控制和改善。     

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白马庙气田蓬莱镇气藏储层致密 ,孔隙结构复杂 ,非均质性强 ,单井产能低 ,研究储层特征和受控因素 ,加强储层改造方是气藏效益开发的出路。储层精细研究揭示 ,气井产能受沉积相和构造条件控制 ;高、中产井与大而厚、物性好的河口坝、河道砂坝沉积微相有关 ,纵向上具很强的层段性 ,主产层集中在Ⅳ～③、Ⅲ～③两套砂组 ,其钻探成功率分别达 82 %和 10 0 % ;平面上多分布于主体构造和东南鼻状突起 ,二者高、中产能井分别占 30 %和 70 %。在深入的地质研究和储层压裂评层选井的基础上 ,采用多层打开、分层压裂、多层合采的方法可提高气井产能 ,并形成了一套行之有效的压裂评层选井的综合配套技术。采用该技术优选出 19口井 ,已实施 5口井全获成功 ,气产量成倍或十几倍增加 ,其中白浅 4 5井气无阻流量高达 18× 10 4m3 /d ,白浅 38井投产 16 5d净增产值 10 0余万元     

Filtration of Non-Newtonian Hydrocarbon Fluid in a High-Frequency Electromagnetic Field

The paper gives the results of experimental investigations of the initial pressure gradient of bituminous oil and the time dependences of variation of the temperature in a formation model and of the well production rate in a microwave-frequency electromagnetic field. The effect of strong decay of the non-Newtonian properties of bituminous oil is revealed. The nonuniformity of temperature distribution over the formation thickness is demonstrated, which depends on the initial production rate of the well and on the duration of stimulation of the bottom-hole zone of formation.     

膜分离技术在水处理领域的应用

对2000年底巴黎“饮用水和工业用水制造领域中的膜技术”国际会议进行了简单的回顾，根据会议经历对当今膜分离技术在水处理领域的应用市场进行分析，提出今后液体膜分离技术的研究和发展的重点。最后对我国液体分离膜技术的发展提出一些建议。