现代制造系统递阶生产计划研究

应用递阶生产计划(HPP)模型研究多约束条件下复杂制造系统的生产计划与调度问题,通过引入三层递阶结构建立按时间和产品大类分解的多目标生产计划模型,针对制造系统生产计划的特点提出了生产作业管理的研究思路。     

基于延时Petri网的热送热装生产计划模型的建立与分析

应用延时Ｐｅｔｒｉ网对连铸－热轧生产过程进行了描述，建立生产计划模拟模型，并利用此模型对热送热装一体化生产计划进行模拟分析和计算，得到了满意的结果。     

基于3Dmine矿业软件的露天矿山采剥计划的数值模拟

为研究露天矿山采剥计划年矿岩总量和矿石量,以某露天金属矿为研究背景,依据锥体排除法生成最优地质开采体,运用动态规划理论对最优开采体进行经济评价,以3Dmine为载体建立采剥计划模型对矿山生产进行数值模拟,并与矿山6年的实际生产数据进行对比分析。研究表明:模拟结果与矿山的实际生产数据基本吻合,运用该模型为矿山预测未来5年的采剥计划。模型得到的采剥计划对该矿山的生产有一定的参考价值,并对其他矿山有借鉴意义。     

工信部小幅提高今年稀有金属生产指标北大核心

2011年稀有金属矿产品和冶炼分离产品指令性生产计划已经下发,并已于4月10日前分解落实到企业。根据计划,政府今年提高了钨、锑、锡、钼、稀土五种稀有金属生产的控制指标。     

考虑铸轧协调的炼钢-连铸-热轧一体化生产计划

 炼钢-连铸-热轧生产计划编制是一个多目标、多约束的复杂组合优化问题。从有利于多工序生产组织的角度,提出了一种可分工序独立编制工序计划,并且按铸轧衔接关系进行系统协调的一体化生产计划编制方法。即首先以铸坯作为热轧与炼钢-连铸不同工序生产阶段统一的生产计划对象,并将炼钢、连铸与热轧的生产目标和约束进行归类抽象,使得炼钢炉次计划、连铸浇次计划和热轧单元计划的制定模型具有内在的逻辑相关性;以缩小铸轧时间差作为铸轧界面衔接关系的协调控制目标,来优化连铸与热轧之间的生产衔接,进而获得一体化生产计划。采用某钢厂的生产订单数据和生产计划目标、约束条件,通过模型仿真计算与生产实绩数据的对比检验了该一体化生产计划编制方法的有效性。     

DIMINE软件生产计划编制系统在高峰山矿区的应用

基于三维可视化平台,使用计算机编制地下矿山生产计划已越来越多的应用于矿山生产中。本文论述了DIMINE软件生产计划编制模块的基本原理与功能,介绍了其在高峰山矿区的应用情况。使用DIMINE软件对高峰山中盘区生产计划进行了预演,分析了计划结果,对该计划提出了若干建议。     

数字平面无线调车系统的应用及运行

在铁路运输生产中,以往所用的模拟平面调车系统只能进行简单语音通话和信令传递,不能满足当前无线电通讯环境复杂且运输生产任务繁重条件下的作业需求。在大批量捣调作业过程中,需临时计划变更时、计划传送极不方便,易出现作业偏差。为提高运输通讯可靠性,引进了数字平面无线调车系统,通过计划无线传输实现了调单无纸化,使铁路无线通讯更加稳定可靠,运输生产组织效率更加高效。     

运用微机管理优化连铸连轧生产调度计划方法的探讨

针对连铸连轧生产调度计划受到限制因素多的状况，提出用微机排序法解决调度计划的困难，对调度计划方法进行改进。     

多台连铸机协同生产技术在过程机中的实现

一般情况下,连铸机往往由独立的过程机进行生产控制,当连铸机出现故障时,生产计划必须重新编制,处理过程浪费大量的人力物力.提出了多台连铸机间的实时协同生产的概念,并结合2008年在宝钢三台连铸机的实际使用,探讨了过程计算机如何通过生产计划的自由转移而实现多连铸机协同生产的实现方法.     

种分分解法生产微粉氢氧化铝

按不同粒度和用途对多品种氢氧化铝进行分类 ,本文主要介绍微粉氢氧化铝产品的种分分解生产技术、干燥技术及其应用。     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

Comparison of the results of surgical and conservative treatment of fractures of the diaphysis of the tibia

In this paper is treated the fundamental problematic of the fracture of the diaphysis of the tibia and the therapeutic results after the conservative and operative treatment are confronted. Among 518 patients with 433 open fractures and 35 with closed fractures of the diaphysis of the tibia, successful treatment of more 2/3 was obtained in the period from 1968 to 1972. Following our casuistics and literature, whose results are similar, we find out that the average total treatment of the osteosynthesis of the fracture of the diaphysis was shortened for 2,5 months depending upon the type and the localisation of the fracture. Apolied methods of the operative and conservative and conservative treatment in relation to the velocity of the medical cure as well as to the extreme anatomical-functional results are analised. We noticed that osteosynthesis, made by the intermedullary nail and the extension of the canals or by a small AO table, by the achieved stability makes conditions of immediate motions and an early rehabilitation. Because of that it gives the best functional results.     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

参与式农业基地建设行动方案设计

为了编制实用性强的基地建设行动方案,首先,确定参与式发展的主体,搭建一个"决策框架";其次,针对行动目标,提出不同参与主体,如管理者、农民、消费者等团队与个人的目标及行动内容;最后,工作应向重塑伙伴式合作关系,挖掘农民自我发展潜力,完成三大角色的转换,打造农业基地文化等方向推进.