基于铁矿粉高温特性的烧结优化配料模型

针对目前烧结优化配料模型大多只对化学成分和碱度等进行约束,缺少对铁矿粉在烧结过程中高温特性约束的现状,本文提出了一种新的基于铁矿粉高温特性的方法,进行烧结优化配料模型研究.鉴于铁矿粉高温特征指标之间信息重叠,对其进行主成分分析,得到新的高温特征指标F1和F2进行建模.基于新方法得到的烧结优化配料模型,通过实际生产应用,...     

微机控制电炉炼钢及优化配料的LG软件

介绍了国内，外计算机在电炉炼钢方面的研究和应用现状及其发展趋势，以及研制开发的用微机控制电炉炼钢及优化配料ＬＧ软件的基本功能，软件组成及特点。     

模拟退火算法在冶炼Mn-Si合金优化配料中的应用

运用现代优化算法中的模拟退火算法对冶炼Ｍｎ－Ｓｉ合金的原料配比进行了优化计算,计算结果表明是正确的,从而为冶金配料的优化计算提供了新的方法与思路。     

烧结配料微机控制的效果

1 前言本钢第二炼铁厂有5台75m~2烧结机,分别由两个配料系统供料。原配料工艺采用容积配料法,即用人工端盘进行重量检查,依靠调整给料机闸门高度控制配料比。使用这种方法不仅工人的劳动强度大,而且无法保     

邯钢烧结配料优化的探讨

根据烧结，炼铁工艺理论和物料平衡计算原理及经验数据，运用计算机技术编制了烧结，炼铁配料综合计算表，用该表可快速计算出原料变化时烧结和炼铁技术经济指标的相应变化，通过对4种原料变化进行实例计算，提出了优化邯钢烧结配比，降低生换成本的途径。     

铁矿石的价值评价与线性规划优化配料

针对攀钢烧结使用的原料品种越来越多,采用单烧方法计算了处种铁矿石单烧状态下的烧结矿品位、吨度价格,并以此作为评价铁矿石价值及矿石采购的重要依据。文章还利用基于目标规划模型对攀钢烧结原料进行优化配料,其原料成本明显低于经验配料法,具有显著的经济效益。     

考虑性能指标的烧结机操作优化控制模型

提出了基于烧结矿性能指标的烧结配料及烧结机操作优化控制模型。并编制了相应的应用软件。实现了烧结机操作区问控制。现场应用表明。此模型的建立与实现。既能稳定烧结矿的性能。提高质量稳定率。又能降低烧结成本。     

基于神经网络的混匀配料优化方法

动用神经优化网络对武钢工业的混匀配料进行了优化计算,计算结果证明是切实可行的,而且比传统的计算方法速度快、精确度高,为混匀配料提供了必要的定量依据。基于神经网络的优化计算也为以后类似问题的优化计算提供了新的途径和方法。     

宝钢薄板合同订制优化与余材控制

通过对宝钢薄板合同的生产余材进行分析,阐述了合同订量和交货卷重对合同余材的影响。通过对合同余材组成的分解,并结合炼钢、热轧和冷轧的生产特点,提出了更为合理的合同订量和交货卷重,为销售在接订合同时提供了量化指导。     

Optimization of the composition of nitridic ceramic tool material by tribotechnical tests

Translated from Poroshkovaya Metallurgiya, No. 4, pp. 46–51, April, 1992.     

Performance-based exposure control limits for pharmaceutical active ingredients

Numerous hypospadias correction techniques were described in the literature. The technique varies according to the position of the meatus and the importance of the chordee. These new techniques and the care taken in the manipulation of the tissues tend to decrease complications like stenoses and fistulas, frequent in the long urethroplasty. The correction of hypospadias should conform to aesthetic and plastic surgery. More than 300 corrections were carried out in our service. Surgical technique varied in the long run. Currently, we choose as often as possible a correction in one time: release of the chordae and urethroplasty. Straightening of the penis is obtained on one hand by release of the cutaneous chordae and wide dissection of the hypoplastic urethral plate and one or more dorsal plications according to Nesbit are carried out if it proves necessary. In the distal, glandular and coronal forms, the correction is of type M.A.G.P.I. (meatal advancement, glanduloplasty). The complication rate is extremely low. The aesthetic and functional result is very satisfactory. In the proximal forms, Duckett technique is used only in the obligatory cases given the large number of complications. It is generally replaced by Onlay technique. The urethral plate is left in continuity and serves as support to the pedicled and vascularized flap. In the intermediate situations with a middle shaft hypospadias, Mathieu technique is again of application. The aesthetic and functional result of this type of surgery requires good knowledge and careful application of the technique adapted to each case.     

请求驱动的服务组合访问控制

提出了一种基于服务请求的角色映射与策略集成机制来解决服务组合中的访问控制问题.为了准确有效地建立域间角色映射,提出了唯一可映射集(unique mapping set,UMS)的概念,通过求取和搜索对应局部域角色层次的UMS,可找到满足外部服务请求的最合适可映射角色集.为了解决由于角色映射造成的域间策略冲突,将角色映射关系划分成3种不同的模式,通过建立或转换不同的角色映射模式可有效避免循环继承、SoD约束违背等常见冲突.与其他方法相比,这种冲突消解方法不仅可以保证服务请求的可满足性,而且能较好地保护各参与域的自治性和安全性.     

Concrete: The advanced industrial material of the 21st century

Portland cement concrete is presented as the most widely used, yet most ignored—by the materials science and engineering community —advanced industrial material. The complexity and the time, temperature, and humidity dependence of its structure and properties are described. Concrete can be produced anywhere in the world at reasonable strengths, but concrete structures are failing, not because of lack of intrinsic strength, but largely because of their exposure to increasingly hostile environments. Current research efforts in understanding the structure-property relationships and in increasing the durability of concrete are reviewed.     

Concrete:The advanced industrial material of the 21st century

Portland cement concrete is presented as the most widely used, yet most ignored—by the materials science and engineering community—advanced industrial material. The complexity and the time, temperature, and humidity dependence of its structure and properties are described. Concrete can be produced anywhere in the world at reasonable strengths, but concrete structures are failing, not because of lack of intrinsic strength, but largely because of their exposure to increasingly hostile environments. Current research efforts in understanding the structure-property relationships and in increasing the durability of concrete are reviewed.     

Optimization of the composition of the metallic charge for 100-ton arc electric furnaces

All-Union Scientific Research and Planning Institute of the State Trust for the Procurement and Processing of Secondary Ferrous Metals (VNIPIvtorchermet). Moldavian Metallurgical Plant. Translated from Metallurg, No. 11, pp. 34–35, November, 1988.     

New technique for knife and radial keratotomy

Low-flow (1 litre min-1) sevoflurane anaesthesia was used in 16 patients undergoing laparoscopic cholecystectomy (group LSC, n = 8) or tympanoplasty (group TP, n = 8), and concentrations of sevoflurane degradation products were measured. Degradation products in the circuit were measured hourly, and end-tidal carbon dioxide concentration, inspired and end-tidal sevoflurane concentrations, and carbon dioxide elimination were monitored. The only degradation product detected was CF2=C(CF3)-O-CH2F (compound A). The mean maximum concentrations of compound A were 21.6 (SEM 1.6) ppm and 19.6 (0.8) ppm in the LSC and TP groups, respectively (ns). The maximum temperatures of soda lime were 46.4 (0.5) degrees C and 44.8 (0.5) degrees C, respectively (P < 0.05). Hourly end-tidal sevoflurane concentrations and concentrations of sevoflurane degradation products were the same for both groups. Carbon dioxide elimination was the same for both groups 1 h after the start of anaesthesia, but was higher in group LSC after 2 h (P < 0.05). Intraperitoneal carbon dioxide insufflation associated with laparoscopic cholecystectomy had no effect on the concentration of sevoflurane degradation products.     

铬铁合金精炼炉计算机配料系统

从铬铁合金冶炼工艺、自动控制理论及计算机技术等方面，全面介绍一个铬铁合金精炼炉计算机配料系统的组成及实现过程，分析了简单下料机构中称量误差产生的原因及改进的方法。改进后的配料系统不但能实现精确、稳定地配料，还实现装料数据的存储和管理，使生产自动化与物业管理有机地结合起来。