基于多系数保角变换法的船舶垂荡纵摇运动仿真     

张腾  任俊生  范小晴  张秀凤 《上海海事大学学报》2019,40(3):51-56

为给航海模拟器建立实用可靠的船舶在波浪中运动的数学模型,基于二维线性势流理论,采用多系数保角变换法对每个船舶横剖面进行高精度拟合,计算各个横剖面的水动力系数和波浪激励力,利用Visual Studio自主开发出船舶在规则波中的纵向运动数值模拟程序。为验证这个数值模拟程序的可靠性,对S175集装箱船在迎浪中运动的幅值响应因子(response amplitude operator, RAO)进行数值计算。结果表明:当弗劳德数为0.275时,RAO计算结果在大部分频率范围内与试验结果吻合良好。因此,这个数值模拟程序能准确地对船舶在波浪中的运动时历进行仿真。  相似文献   

基于博弈理论数学模型的人才培养策略解析     

舒译苇 《成才之路》2020,(3):88-89

经济和社会的高速发展使得人力资源竞争逐渐成为国际竞争的核心,特别是高素质人才的培养已经成为制约我国经济持续发展的关键。文章根据博弈论的基本概念和研究思路,用纳什非合作博弈理论数学模型解析人才培养策略。  相似文献   

基于灰度图像的边缘检测方法   总被引：3，自引：0，他引：3  

杨群  洪春勇  刘海英 《科技广场》2005,(5):34-37

介绍了基于微分、形态学和小波变换等多种图像边缘检测的方法。在微分算子中分析了传统算子的特点和缺陷并讨论了几种具有良好边缘检测的算子。此外，还对新的边缘检测的理论和方法进行了介绍。  相似文献   

近代西方数学与科学兴隆期的比较     

贾文毓 《科学学研究》2003,21(1):23-24

意、英、法、德、美五国科学兴隆期的出现 ,是以数学兴隆期的出现为前提和基础的。数学兴隆期开始约 80年后 ,才有科学兴隆期的起始 ;数学兴隆期峰值年出现约 80年后 ,方有科学兴隆期峰值年的显现 ;数学兴隆期结束约 80年后 ,科学兴隆期也随之消亡。  相似文献   

浅析对称性在数学解题中的应用     

王军 《今日科苑》2006,(6):I0020-I0020

自然界中许多事物都呈现对称性,在数学学习和研究中更是如此。重视对称性的应用并且恰当地利用对称性,可以为我们提供解题思路, 帮助我们简化数学中的计算和证明。  相似文献   

微积分中若干问题的研究(Ⅱ)     

侯双根 《安阳工学院学报》2005,(2):39-44

对于原函数存在定理的推广,给出了另一种证明;对定积分的中值定理给出了正确的证明,而其它书中的证明是欠妥的;用定积分的定义等证明了微积分的基本公式;给出了几个旋转体的体积公式;几何级数前n项和公式的应用.  相似文献   

Home learning environment and development of child competencies from kindergarten until the end of elementary school     

《Contemporary educational psychology》2017

Literacy and mathematical competencies are essential for a successful school career and precursors of these abilities develop in kindergarten. In addition to children’s early cognitive abilities, family characteristics such as the socioeconomic status and the home learning environment (HLE) are predictors of early child competencies. However, few studies outside the US and the UK have analyzed long-term effects of the early HLE on child development, simultaneously considering various explanatory factors. In this longitudinal study, data of 920 German children were obtained in kindergarten some 18 months before school entry (child mean age: 4;10). At this point, precursors of reading, spelling and mathematics were assessed. In addition, parents were asked to complete surveys on family characteristics. Child assessments were repeated with standardized measures of mathematical and literacy abilities at the end of Grade 1 and in the middle of Grade 4 (child mean age: 9;9), the final grade in German elementary schools. In Grade 4, teachers were also asked to provide their recommendation for children’s secondary school track (“Hauptschule” for lowest secondary school track, “Realschule”, or “Gymnasium” as highest secondary school track). HLE was not only a good predictor of early abilities, but also directly predicted competencies at the end of elementary school when precursors, former academic achievement and child and family characteristics were controlled for. In addition, children living in more favorable HLEs were more likely to be recommended for higher secondary school tracks by their teachers.  相似文献   

Embellishing Problem-Solving Examples with Deep Structure Information Facilitates Transfer     

Hee Seung Lee  Shawn Betts  John R. Anderson 《Journal of Experimental Education》2017,85(2):309-333

Appreciation of problem structure is critical to successful learning. Two experiments investigated effective ways of communicating problem structure in a computer-based learning environment and tested whether verbal instruction is necessary to specify solution steps, when deep structure is already embellished by instructional examples. Participants learned to solve algebra-like problems and then solved transfer problems that required adjustment of learned procedures. Experiment 1 demonstrated that verbal instruction helped learning by reducing learners' floundering, but its positive effect disappeared in the transfer. More importantly, students transferred better when they studied with examples that emphasized problem structure rather than solution procedure. Experiment 2 showed that verbal instruction was not necessarily more effective than nonverbal scaffolding to convey problem structure. Final understanding was determined by transparency of problem structure regardless of presence of verbal instruction. However, verbal instruction had a positive impact on learners by having them persist through the task, and optimal instructional choices were likely to differ depending on populations of learners.  相似文献   

钢液真空循环精炼过程的数学模拟     

魏季和 《上海大学学报(英文版)》2003,7(2):97-117

1　Introduction　Withuninterruptedlyincreasinginthedemandforultracleansteel,thevacuumcirculation (RH)refiningprocesshasnowbecomeaprinciplerefiningoperationforreducingthecarbonanddegassingofmoltensteel.VariousrefiningtechnologiesusingoxygenorpowderinjectionandblowingintheRHtreatmentformakingultralow carbonandultralow sulphursteelhavebeendevelopedinrecentyears[1 10 ] .Actually ,theRHre finingprocesshasbeenextendedtobecomeamulti functionrefiningtechnology ,whichisenabledtore movecarbon ,oxygen …  相似文献   

《新五代史》英文版序言     

戴仁柱  马佳 《安徽师范大学学报(人文社会科学版)》2006,34(3):316-321

将《新五代史》置于卷帙浩繁,风格卓异的中国历史著述的大背景下加以审视和观照,凸现了欧阳修历史写作所体现出的既有春秋笔法,史记风范的精髓,同时又不拘泥于前人,自为一家的新范式,以及他所秉持的对历史事件的独立的批判精神,对历史人物的源自儒家传统的道德评判。  相似文献