简化二次型规划算法在新钢中板厂的应用

针对中宽厚板轧制道次的负荷分配问题,开发了简化二次型规划算法,解决了负荷分配算法稳定性问题,该算法运算快捷,能适应钢种、规格变化频繁的复杂工况。该算法已在新余钢铁集团有限公司中板厂稳定应用,尺寸命中率提高了近3个百分点,效果显著。     

PZ-B型竖炉球团炉内二次冷却器的设计

针对国内竖炉球团二次冷却器的应用及研究现状，提出其存在的问题，并介绍了种可用来替代目前竖炉球团二次冷却器的新型PZ－B型冷却器的设计、冷却原理及应用前景。     

中厚板轧制道次规划算法的研究

中厚板道次规划算法是中厚板过程控制技术的核心。比较了Siemens采用SQP算法、国内综合等储备方法以及简化的二次型规划算法。Siemens的SQP算法复杂,参数配置困难;综合等储备方法的算法较简单,但是对物理模型和边界条件要求较高,存在计算得不出结果的问题;简化的二次型规划算法相比其它2个算法稳定性和参数配置都比较容易,计算速度快。实践表明,该方法更适合工业现场的在线应用。     

冷轧工作辊用半高速钢的二次硬化效应

为开发冷轧工作辊用半高速钢,设计了新钢种的化学成分,研究了试验钢淬火后在回火过程中二次硬化效应及其影响因素,并初步探讨了试验钢的二次硬化机理.研究结果表明,新型半高速钢有显著的二次硬化效应,能满足冷轧工作辊的硬度要求;随Mo、V和Si等合金元素含量升高钢的二次硬度升高,随淬火温度升高钢的二次硬度出现两次峰值.二次硬化效应与残余奥氏体在回火过程中转变为马氏体和马氏体基体中析出细小弥散的Mo2C和VC有关.     

线性分式规划的多项式算法

Charnes-Cooper提出了一种线性分式规划的算法。本文在此基础上证明了线性分式规划与一种特定的线性规划等价。将Karmarkar算法用于该线性规划,我们得到了线性分式规划的多项式算法。     

有关“二次钝化”现象的探讨

本文对采用恒电位法测定奥氏体不锈钢316L在NaCl溶液中的阳极极化曲线时产生\     

板坯连铸机二次火焰切割铸坯定尺自动无级调节技术的研究

介绍了1400mm板坯连铸机铸坯在线二次火切割定尺长度的自动无级调节技术的研究、设计及开发,并实际成功应用,为板材轧机生产线提供了可短至1370mm定尺的合格铸坯,可极大地满足用户多规格品种钢板的全部需求,且经济效益可观。     

板坯连铸机二次火焰切割铸坯定尺自动无级调节技术的研究

介绍了1400mm板坯连铸机铸坯在线二次火焰切割定尺长度的自动无级调节技术的研究、设计及开发,并实际成功应用,为板材轧机生产线提供了可短至1370mm定尺的合格铸坯,极大地满足用户多规格品种钢板的全部需求,且经济效益可观.     

进口二次油片对我国取向电工钢市场的影响

2009年对国内三大地区进口二次油片市场进行了专题调研,先后走访了二十多家相关企业,并征求国内部分变压器厂的专家对进口二次油片的看法和意见,经过整理和认真分析,提出了二次油片的来源、加工过程、可能产生的质量稳患、对我国取向电工钢市场环境的影响,提出几点建议。对正确认识二次油片,改善我国取向电工钢市场环境,使变压器行业减少质量、安全隐患,健康发展,为国家如何管理进口二次油片,提供了一定的信息支撑和参考建议。     

转炉烟道内二次燃烧和传热传质过程的研究

采用非预混燃烧模型和离散传播辐射模型,对转炉烟道内的流动、传热传质和燃烧反应进行三维数值模拟,研究炉气转变为烟气的规律和烟道内烟气浓度分布特点.结果表明,烟道内大体可分为3个区域:炉口燃烧区,卷吸的空气在烟罩附近与炉气发生燃烧反应;烟道混合区,燃烧后的烟气与未燃炉气逐渐混合,但仍有较大的成分波动;弯头混合区,烟气进一步...     

A new technique for radiotherapy planning using quadratic programming

Previous attempts at optimization of radiotherapy planning are described and criticized, and consideration of these attempts has resulted in the development of a new technique using quadratic programming. Uniformity of tumour dose is selected as the most important feature of any plan, and this is achieved by minimizing the variance of the dose to preselected points within the tumour. The dose to vulnerable regions can be constrained not to exceed a given percentage of the mean tumour dose. Optimization of field weight and field type is possible. The operation of the system is described and some typical results are given.     

Small structural ensembles for a 17-nucleotide mimic of the tRNA T psi C-loop via fitting dipolar relaxation rates with the quadratic programming algorithm

The kinetic behaviour of a naproxen human serum albumin conjugate (Nap23-HSA) was investigated in rats and in isolated perfused rat livers (IPRL), as compared to its active metabolite naproxen-lysine (Nap-lysine) and free naproxen. Through covalently linking the anti-inflammatory drug naproxen to HSA, this drug can be selectively delivered to non parenchymal cells of the liver. Liver endothelial and Kupffer cells play an important role in the pathogenesis of inflammatory liver diseases. Targeting naproxen to these cells might increase its efficacy and reduce the side effects. The altered kinetic properties of Nap23-HSA, after i.v. injection of 22 mg x kg(-1), as compared to an equimolar amount of the uncoupled drug, were demonstrated in vivo by a decrease in the steady state volume of distribution (41 +/- 5 vs. 134 +/- 19 ml x kg(-1)), a decrease in its clearance (0.48 +/- 0.05 vs. 0.63 +/- 0.1 ml x min(-1) x kg(-1)), a shorter plasma half life (60 +/- 11 vs. 152 +/- 44 min) and a sustained biliary excretion. Liver targeting of Nap23-HSA was clearly demonstrated: drug content of the liver 180 min after injection was about 30 times higher for Nap23-HSA as compared to naproxen itself. The IPRL experiments showed that the Vmax of hepatic removal of the conjugate was 40 microg x min(-1) x g liver(-1). With doses below receptor saturation a rapid removal of the conjugate (t1/2 = 6 min) from the perfusion medium was found. In conclusion, this study demonstrates the saturable uptake of Nap23-HSA and its lysosomal degradation in both in vivo and IPRL experiments. Covalently linked naproxen is released as Nap-lysine. This active metabolite accumulates in Kupffer and endothelial cells in which it reaches therapeutic concentrations. Release from these cells leads to rapid uptake by hepatocytes and carrier mediated excretion into bile. Levels of Nap-lysine in bile and plasma reflect the slowest step in its generation: the proteolytic release in endothelial and Kupffer cells.     

采用序列二次规划法进行空间网架结构优化设计中的关键问题

采用序列二次规划法对空间网架结构优化设计时，起控制作用的约束条件是应力约束，在对应力约束函数进行序列二次归格化时必须进行应力灵敏度分析，同时设计变量运动极限的选取将直接影响到迭代过程的平稳度、迭代次数以及迭代计算结果的精确度，既此提出了应力灵敏度和设计变量运动极限的计算方法及理论依据。     

一类二层多目标规划的混沌遗传优化算法及其应用

针对求解一类二层多目标规划问题,首先将其转化为等价的单目标规划问题,然后利用遗传算法优化的反演性和混沌优化方法的遍历性,并结合精确罚函数求解非线性约束优化问题,提出了求解此类问题的混沌遗传算法.该方法能够有效改善遗传算法的局部搜索能力和搜索精度,求解精度和可靠性较高.实际算例表明,算法是有效可行的.     

Evaluation of a programming algorithm for the third tachycardia zone in a fourth-generation implantable cardioverter-defibrillator

Lungs from eight goats of mixed sexes and breeds (Cashmere, Nubian and Toggenburg) aged between 10 and 48 months were used in this study. Tissues from lung parenchyma were minced and routinely prepared for transmission electron microscopy (TEM) after using different methods of fixation. Thick sections were examined with a light microscope and samples, to include terminal bronchioles, respiratory bronchioles, alveolar ducts and alveolar membrane, were selected for ultrathin sectioning. Six cell types, ciliated, non-ciliated bronchiolar epithelial, mucus-producing, alveolar Type I, alveolar Type II and capillary endothelial cell were identified and characterised cytologically. It was established that the cell population in the distal airways is similar to that observed in other domestic mammals. The mucus-producing cell, which appears to be a common cell type in the distal airways of man and Rhesus monkey, was encountered particularly in adult goats in the present study. This study has also established that the Clara cell of the goat shows some cytological differences from those of some other mammalian species by having a large amount of SER, particularly in the apical region. Lipid vacuoles were seen to be a feature of the alveolar Type II cells; these do not appear to have been reported in other mammalian species. The study has provided a basic understanding of the morphological features of the cell population of the epithelium lining the distal airways in the goat's respiratory tract. The difference in junctional complexes between the various alveolar epithelial cells perhaps signify a different pattern of intercellular transport, thus influencing the pathogenesis and resolution of alveolar pulmonary edema.     

基于列生成与线性规划的炼钢组炉优化算法

针对考虑钢级"以优充次"的炼钢组炉问题,构建了以炼钢成本最小化与炼钢余材最小化为目标的多目标优化模型,基于目标优先级不同,首先以降低炼钢成本为目标,利用列生成算法给出具有最低炼钢成本的组炉方案;在此基础上,建立余材优化线性规划模型,通过缩减炉重和增加合同量的方式,进一步降低炼钢余材,得到最终的组炉方案。实例表明,该算法具有良好的优化性能和实用性。     

确定后方交会点是否落在危险圆域内的程序设计方法

针对后方交会危险圆的问题,介绍了确定后方交会点是否落在危险圆域内的程序设计方法.