一类区间非线性规划不确定性问题的转化

本文在对区间参数运算关系阐述的基础之上对仅目标函数含有区间参数的非线性规划模型及算法进行了研究,将区间非线性规划的不确定性问题转化为三个目标规划问题.     

基于区间数灰理论的短期经济增长波动研究

多属性区间数排序及决策普遍存在于工程系统及社会经济系统之中,它是决策理论与方法研究的一个重要内容.以往的经济增长波动研究多局限于长周期经济增长波动研究,研究方法多采用统计学相关知识.本文将多属性区间数排序及灰关联度理论结合在一起,通过对基于GDP增长的多属性影响因素来构建多属性波动区间数,并采用灰关联度相关计算算法,应用于国民经济增长的短期波动质量监测,最后通过实证分析来证明这一方法在实践中的价值与意义.     

运用商不变性质的简便运算

简便运算是在特殊条件下应用运算定律、性质的快速计算.在学生学习了<商不变性质>后,如何让学生灵活地运用商不变性质进行除法的简便运算?如何为学生今后的学习打下扎实的基础?<运用商不变性质进行简便运算>我虽然已经执教过多遍了,但是认认真真反思自己对此内容的教学却还是第一次.     

浅谈行列式的几种计算方法

行列式是线性代数中的一个重要内容,行列式的计算具有一定的规律性和技巧性,本文结合实例,归纳出了几种求行列式的计算方法。     

烧结除尘灰的提前制粒工艺

对烧结除尘灰的性质进行了分析,提出了除尘灰回收利用的新方法,总结了工业除灰制粒的新工艺及应用效果,为冶金行业粉尘综合利用提供了一条行之有效的途径。     

焦炭热性质研究

采用数据分组分析的方法,利用人机交互手段对参数空间多个二维投影进行研究,得到了焦炭热性质的合理有效生产控制参数区间:灰分为9.1%～9.4%,挥发分》27.5%;细度》75.9%,且强粘煤比例不小于50.实践表明:针对生产检测不足和管理粗糙而造成的成组有效数据量少且数据可靠程度低的现状,该方法使用简单且对炼焦厂工业生产有效.     

烧结除尘灰制粒新工艺的开发与应用

本文分析了烧结除尘灰的性质，提出了除尘灰回收利用的办法，总结了工业除尘灰制粒的新工艺及应用效果，为冶金行业粉尘综合利用提供了一条行之有效的途径。     

干熄焦除尘灰代替部分高炉喷吹煤的应用研究

通过对干熄焦除尘灰和高炉喷吹煤的性质比较,分析干熄焦除尘灰代替高炉喷吹煤的可行性。     

理论回收率计算方法的探讨

《有色金属》74年2期发表了许权同志的使用计算尺计算理论回收率的方法。本文介绍使用计算尺计算理论回收率的其他方法,并着重介绍简化计算机运算手续的方法及其应用,与读者共同探讨。限于水平,错误及不当之处,在所难免,恳望读者们指正。     

粗轧带坯宽向温度分布的仿真

基于以往对固体热交换问题的研究,提出了一种新的适合于粗轧带坯宽向温度分布的仿真方法,并对热交换系数的优化提出有效的经验值估计区间法。仿真实验结果表明：新的仿真方法改善了仿真数学模型的形式,并且利用经验值估计区间的参数优化法大大地提高了运算效率。     

Prediction of the coordination numbers of liquid metals

In this communication, the coordination numbers of liquid metals can be predicted by the modified coordination equation with their atomic parameters, molar volumes, melting points, and enthalpies. The results show that the predicted values are in agreement with experimental data, and the average percentage deviations is ±6.44 pct, which is less than those of both the Hines and Cahoon methods. This finding shows that the prediction method developed in this work is more accurate and convenient than either of the other methods.     

Optimising grey iron powder compacts

Abstract

The grey iron microstructure Fe–2C–2Si powder based compact is tailored by different kinds of in situ and post sintering processing. This has been achieved by combining thermodynamic and kinetics modelling of microstructure development with sintering and controlled heat treatment experiments of tensile test specimens die compacted at 600 MPa. Applying optimised sintering conditions led to a grey iron like microstructure with 95% relative sintered density. Sinter hardening the compacts led to 500 MPa in yield strength and 600 MPa in ultimate tensile strength in combination with ductile fracture. Quenched and tempered condition showed the same strength values, but combined with brittle fracture due to martensitic structure. Pore rounding and partial pore filling by graphite were obtained by austenising isothermal hold during the cooling of the sintering cycle.     

Anxiogenic effect of corticotropin-releasing hormone in the dorsal periaqueductal grey

To investigate whether the dorsal periaqueductal grey (DPAG) might be involved in the anxiogenic effect of intracerebroventricular (i.c.v.) administered corticotropin-releasing hormone (CRH), rats (n = 6-13) received microinjections into the DPAG of CRH (1 or 2 microg) or saline and were tested on the elevated plus maze. The drug caused a dose-dependent decrease in plus maze exploration (percentage of entries into open arms: saline 31.9 +/- 8.6, CRH 1 microg 19.2 +/- 4.0, CRH 2 microg 6.9 +/- 3.7; p < 0.01, ANOVA). In a second experiment the anxiogenic effect of intra-DPAG CRH (2 microg) was prevented by previous microinjection of alpha-helical-CRH(9-41) (0.5 microg), a CRH antagonist (percentage of entries into open arms: saline + CRH 20.3 +/- 3.7, alpha-helical-CRH(9-41) + CRH 45.7 +/- 1.6). These results suggest that the DPAG may be a site of the anxiogenic effect of i.c.v. injected CRH.     

灰色关联分析在岩体可爆性分级中的应用

根据爆破岩体相关实测数据,利用岩体的灰色性和多指标性,采用灰色关联分析法对该岩体进行可爆性分析,确定岩体可爆性级别,从而选取合适的爆破参数.此种方法通过定量计算来确定岩体爆破性级别,区别于以往的定性分析,可以避免主观因素对权重确定的影响,更客观地体现各个分级指标对可爆性分级的贡献,因此,方法可靠且简单易行.     

灰色关联分析法在爆破震动监测中的应用

以国内某大型露天矿山15组爆破设计参数和爆破震动测量数据为依据,基于灰色关联分析法理论基础,计算得出爆破特征变量震动速度、震动主频、震动时间与爆破设计参数最大单段药量、总药量、爆心距之间的灰色关联度,成功预测各参数对爆破震动影响的主次关系。该矿山爆破影响震动速度和震动时间的主要因素为爆心距,影响震动主频的主要因素为最大单段药量。预测结果可为该矿山今后控制爆破震动提供理论依据。     

关于Smarandache三角形数的下部及上部数列

目的 研究Smarandache三角形数及其数列的性质.方法 利用初等方法和解析方法对其进行研究.结果 研究了三角形数的分部序列的算术平均值及几何平均值的极限问题,获得了这些数列的渐近公式.结论 发展了F.Smarandache教授在一书(Xiquan Publishing House,1993)中涉及的相关研究工作.     

Abstract representations of numbers in the animal and human brain

There is evidence to suggest that animals, young infants and adult humans possess a biologically determined, domain-specific representation of number and of elementary arithmetic operations. Behavioral studies in infants and animals reveal number perception, discrimination and elementary calculation abilities in non-verbal organisms. Lesion and brain-imaging studies in humans indicate that a specific neural substrate, located in the left and right intraparietal area, is associated with knowledge of numbers and their relations ('number sense'). The number domain is a prime example where strong evidence points to an evolutionary endowment of abstract domain-specific knowledge in the brain because there are parallels between number processing in animals and humans.The numerical distance effect, which refers to the finding that the ability to discriminate between two numbers improves as the numerical distance between them increases, has been demonstrated in humans and animals, as has the number size effect,which refers to the finding that for equal numerical distance,discrimination of two numbers worsens as their numerical size increases.