An Intelligent MMRP Constraint Programming System

In this paper,an intelligent constraint programming system for manufacturing material resource planning (MMRP) was presented.It is aimed to tackling large,particularly combinatorial,problems during the MMRP process,which increasingly involves complex sets of objectives and constraints in today's industrial manufacturing.The system consists of a do- main-specific architecture,an algorithm library,and a pre-defined solution library,based on which intelligent agents can effi- ciently construct MMRP problem specifications,select suitable algorithms to solve problems,and evolve a population of solutions to- wards a Pareto-optimal frontier.Our system significantly improves the efficiency,effectiveness,and reliability of MMRP prob- lem solving.     

Experimental and discrete element numerical analysis of side slope instability induced by fissure water underlying impervious bed

1 Introduction The in situ observations and analysis on the landslide events indicate that water is one of the key factors which induce landslide of the mountain mass[1―8]. The mechanism offissure water inducing landslide can be generalized into three aspects: (1) the softening influence of water weakens the strength of materials on the slip surface[9―11]; (2) the cleft water pressure towards the slide slope free face increases sliding force[12―15]; (3) water pressure on the slip surface lo…     

Flume Experiment on Stream Blockage by the Debris Flow From Tributary

Stream blockage by the debris flow from tributary valleys is a common phenomenon in mountainous area,which takes place when large quantities of sediment transported by debris flow reaches a river channel causing its complete or partial blockage.The dam formed by debris flow may causes upstream and downstream flooding,and presents great threat to people and property.Because of the catastrophic influence on people and property,debris-flow dam has attracted many attentions from the researchers and local administration.But,lit- tle attention has been given to the quantitative interrelationships of the potential influential factors.In this pa- per,the interrelationships of important influential factors caused the stream blockage by debris flow were ana- lyzed through flume experiment,and a model to predict the blockage was presented.     

Water target based cross-calibration of CBERS-02 CCD camera with MODIS data

The CBERS-02, the second satellite of China Brazil Earth Resources Satellite series, was launched on Oct. 21, 2002. Onboard the satellite, there are three major sensors, a CCD camera, a wide field imager and an infrared multispectral scanner (http://www. cresda.com). The purpose of this paper is to calibrate the CCD camera with a methodol- ogy of cross-calibration. The spatial resolution of the multispectal bands of CCD camera is 19.5 m, the swath is about 115 km. It is capable of side…     

Estimation of the resident’s additional dose in bone-coal mining areas of the five provinces

1 Introduction In the National Investigation of Natural Radioac-tive Levels (abbreviated as “investigation of levels” hereinbelow) during 1983 to 1990, it is found that the specific activities of radionuclides in bone-coal are relatively high. The increase of radioactive level in the environment and the rise of the public accepted dose might be caused by some artificial activities, which include mainly mining and utilizing spontaneously bone-coal by local peasants, producing bone-coal cind…     

Experiment of Microwave Heating on Self-Fluxing Pellet Containing Coal

Self fluxingpelletscontainingcoal (SFPC)areartificialironorewithuniquepropertiesofself re ductionathightemperature .Athightemperature ,averyhighmetallizationratecanbereachedrapidlywithoutexternalreductioncondition ,sothepelletslooklikemicro blast furnace .Thereductionrateofthe pelletishigherathighertemperature ,withsmallerdiameterofpellet ,finercoalparticlesandsmallersizeoftherawmaterials[1] .However ,thereductionreactionisanendothermic process ,andthesupplyofheatfromthesurfaceofpellettothec…     

运行参数对锅炉屏底横截面温度场的影响

为保证锅炉安全经济运行,避免锅炉屏底结渣问题,采用声波测温系统对屏底横截面温度场进行实时监控,并基于该系统分析锅炉运行氧量、燃尽风风门开度、二次风风门开度以及一次风速等主要运行参数对屏底横截面温度场的影响。结果表明:不同负荷工况下,屏底横截面温度随着运行氧量的增大先升高后降低,随着一次风速的增大而升高;低负荷工况下随着二次风风门开度的增加,其对应侧屏底温度降低;中低负荷工况下屏底横截面温度随燃尽风风门开度的关小而升高,高负荷呈相反趋势。根据分析结果,300 MW负荷工况下经过运行优化调整,屏底烟温偏差得到改善,其横截面最高温度由调整前的1 401 ℃降低至1 364 ℃,下降37 ℃,降低了屏底结渣风险,同时锅炉热效率提高了0.53百分点。该结论可为锅炉安全经济运行提供参考和借鉴。     

SCAL型间接空冷系统循环水中溶氧量变化规律及其对pH值间接影响

表面式换热器铝制散热器（SCAL）型间接空冷（间冷）机组已经成为解决我国北方富煤贫水地区发电的有效措施,该机组SCAL型间冷系统稳定运行过程中常出现循环水pH值异常升高的现象。由于系统内散热器采用铝材质,pH值异常升高会破坏铝管表面氧化膜,导致散热器腐蚀甚至泄漏,因此循环水pH值异常升高是该系统运行的难题。通过对SCAL型间冷系统结构的分析、水质调研,分析了系统中的动态变量,通过理论计算和工业试验验证对该问题进行了深入研究。结果表明:SCAL型间冷系统在运行期间基本处于密闭状态,外界氧气难以扩散进入,系统循环水中溶解氧的来源为系统运行前除盐水中溶解的氧气;碳钢的腐蚀反应是系统中溶解氧主要的消耗方式;溶氧量变化改变了碳钢腐蚀产物的类型,当系统中溶氧量较低时,碳钢腐蚀生成的Fe(OH)2具有较大的溶度积,能够导致循环水pH值升高。     

微波辐照载锰活性焦脱硝实验研究

通过在活性焦上负载Mn2O3实现微波低功率（200 W）高效脱除NO。实验发现,经硝酸氧化处理和负载Mn2O3,活性焦表面的羰基和羧基等含氧官能团含量增加,微波辐照使得活性焦比表面积和微孔体积大幅增加,为反应气体在活性焦表面吸附提供丰富的表面活性位,有利于NO的脱除。硝酸处理后的活性焦负载Mn2O3,脱硝效率能稳定达到85%以上,负载Mn2O3使得微波诱导的放电强度增强,等离子体浓度增加,更多的稳定态NO分子被转化为激发态,促进了NO还原反应的发生。     

300 MW机组循环流化床锅炉选择性非催化还原系统模拟及优化研究

通过模拟300 MW机组循环流化床（CFB）锅炉的选择性非催化还原（SNCR）脱硝过程,研究了反应温度、氨氮摩尔比、还原剂雾化粒径、还原剂喷射速度等对SNCR脱硝效果的影响,并对某电厂300 MW机组CFB锅炉的SNCR脱硝系统进行了优化。结果表明:在800~ 1 000 ℃的反应范围内,随着温度和氨氮摩尔比的升高,脱硝效率随之提高;还原剂雾化粒径的增加和喷射速度的提高对脱硝效率提升的幅度很小;某300 MW机组CFB锅炉SNCR系统及运行参数优化后,锅炉在3个典型负荷下均实现了NOx的超低排放,最大脱硝效率达到了74.2%。