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Search Results: 1 - 10 of 293233 matches for " 刘晓莹 "
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 范晓倩, 刘莹, 崔利宏 Advances in Applied Mathematics (AAM) , 2016, DOI: 10.12677/AAM.2016.54077 Abstract: 本文从研究二元多项式插值的适定性问题着手，在构造二元分次插值适定结点组的“添加横直线法”和“添加竖直线法”的基础上，对二元分次插值适定性问题进一步研究和探讨，给出了二元分次插值适定结点组的几何结构和基本特征，构造了二元分次插值适定结点组的“添加抛物线”方法，推广了已有的研究结果，最后给出算例对所得研究结果进行了验证。 The paper studies from the posedness of bivariate polynomial interpolation. Based on the methods of “adding a horizontal line” and “adding vertical line” in constructing well-posed node group of binary interpolation, this paper further researches and discusses the posedness of binary graded interpolation, and gives geometrical structure and basic characteristics of well-posed node group of binary graded interpolation, then constructs the method that adds parabola for the well-posed node group of binary graded interpolation and generalizes the existing research results. Finally, the numerical examples are given to verify the research results.
 刘莹, 范晓倩, 崔利宏 Advances in Applied Mathematics (AAM) , 2016, DOI: 10.12677/AAM.2016.54076 Abstract: 多元函数插值是一个经典而又复杂的问题，本文在以往二元分次插值研究的基础上，进一步对的三元分次插值问题进行探究。首先给出了三元分次空间的定义，进而在欧式空间中对三元插值结点组的适定性进行了探索。将递归构造原理具体到三元空间，通过添加斜平面法来证明构造新的插值适定结点组。然后，通过添加平面和二次代数曲面研究了构造三元分次多项式插值的适定结点问题，并使用MATLAB软件对实际应用的例题计算结果进行了展示。 Multifunction interpolation is a classic but complex issue. Based on the previous binary graded interpolation research, we study the ternary graded interpolation further. Firstly, we give the definition of ternary graded space, then we explore the well-posedness of the ternary interpolation node group in the European space. We generalize the recursive structure principle to ternary space, and then construct new properly posed node group by adding bevel plane. Lastly, we research the problem of structuring the nodes group of ternary graded interpolation by adding plane and quadric surface, and show the calculation results of the practical examples by using MATLAB.
 刘建阁, 李昌莹, 陈军, 蒋晓华, 孙吉良 Nuclear Science and Technology (NST) , 2015, DOI: 10.12677/NST.2015.33011 Abstract: 本文采用RELAP5程序的四种不同流体动力学模型计算了蒸汽产生过程的热工水力特性，比较了四种模型之间的差异，采用直流蒸汽发生器实验数据进行模型的准确性比较和分析，结果表明：四种模型计算一次侧单相液流动与换热过程的热工特性趋势一致、数值大小基本吻合；四种模型计算两相过热蒸汽产生过程趋势一致，但热工参数压力、温度、含汽率、热流密度的数值存在差异。通过与实验数据的对比和分析，为准确计算直流蒸汽发生器的瞬态过程，推荐优先选用非均匀、非平衡态模型，其次为均匀、非平衡态模型，不推荐采用均匀、平衡态模型或非均匀、平衡态模型。The thermal hydraulic characteristic of the once-through steam generation is calculated by using the four type fluid dynamic models of RELAP5 code. The results are compared with the experiment data. The results show that: the trends and calculated values of the primary single-phase flow pa-rameters are close to the experiment data. The thermal hydraulic trends of the superheated steam are similar, but the thermal parameter values, such as pressure, temperature, quality and heat flux, exist some differences. Based on the comparison with experiment data and analysis, to better calculate steam generation transient process and parameters, the first choice is nonhomogeneous and nonequilibrium model, and the second is the homogeneous and nonequilibrium model. The nonhomogeneous and equilibrium model, or the homogeneous and equilibrium model, are not recommended.
 电工技术学报 , 2015, Abstract: 提出新型能量分离型喷口结构,在喷口上游引入X型导流片,以改变气流流路。为分析新型喷口对灭弧室内部电场分布的影响,采用有限元法,结合550kVSF6断路器绝缘型式实验要求,对有无导流片结构的高压SF6断路器灭弧系统的绝缘特性进行数值计算与分析,得到在开断过程中导流片结构对断路器灭弧室内电场分布的影响。三维电场计算结果表明,有导流片结构的灭弧室内部最大电场强度值较无导流片结构有所降低,最大降低量为4.8%。
 刘晓宇,周波,梁莹 电工技术学报 , 2015, Abstract: 将双级矩阵变换器（TSMC）引入起动/发电系统,构成基于TSMC的新型起发系统（TSMC-S/G系统）。系统起动时采用三相六拍控制策略,并对TSMC采用PWM调制进行电流调节。针对系统特点,详细分析了不同PWM调制模式对TSMC母线电流、安全换流策略、转矩脉动以及非导通相端电压、电流的影响,研究了各种调制模式的特点,提出了优化的调制策略,最终确定了最适合TSMC-S/G系统起动的调制模式。仿真分析与实验结果均验证了理论分析的正确性与可行性。
 环境工程学报 , 2014, Abstract: 分散式污水再生回用工程是为缓解水危机及改善水环境而进行投资建设的准公益性项目,具有较大外部效益。为准确评价该类项目的经济性,把环境会计理论应用到项目的经济评价中,使得项目的经济效益得以体现。通过对西安某高校分散式污水再生回用工程分析,表明对分散式污水再生回用项目进行投资建设不仅可以改善水环境,又可以获得较好的经济效益。随着可持续发展战略及循环理论的深入贯彻,人们对改善环境的支付意愿的提升将进一步提升该类项目的经济性。
 西北农林科技大学学报(自然科学版) , 2007, Abstract: 以8种基因型的羊草幼穗为材料,研究了与愈伤组织诱导、状态调控、分化等过程相关的因素。结果表明,羊草愈伤组织的诱导率在不同基因型羊草幼穗之间存在较大差异,使用n6-ms培养基交替继代,培养基中添加2.0mg/l2,4-d、1.0mg/laba、100mg/l水解酪蛋白(ch)、300～500mg/l谷氨酰胺(gln)和500mg/l脯氨酸(pro),可有效改善羊草愈伤组织的生长状态,使其保持良好的胚性并提高分化率。
 周莹,贺晓,徐军,刘健 生态学报 , 2009, Abstract: This research focused on the investigation into the vegetations of coal mine subsided areas of Shenfu\|Dongsheng Coal Mine Region in different years and landforms. Based on the data obtained from the field survey, importance values of the plant species and plant diversity indexes were calculated. The findings showed that plant species in the region were relatively poor because of the fragile ecological environment. There were 114 species found in the investigated areas belonging to 82 genera, 30 families. The plant species in Shangwan, Daliuta and Huojitu mines were richer than those in Bulianta and Ulan\|mulun mines. After subsiding disturbance, the main components and the constructive species of the plant communities did not changed. Species diversities in all mining areas, except Ulan\|mulun mine where the ecological environment is much more fragile, showed no significant differences. Numbers of plant species in subsided plots were more than those in the undisturbed areas. Numbers of plant species in the plots subsided within 1 year were more than those in the plots of subsided for 1 year, which indicated that the ground subsidence caused by coal mining slightly influenced the community composition within short period.
 物理学报 , 2007, Abstract: The entropy density,energy density and pressure of the spin fields near the event horizon in Taub-NUT spacetime are investigated by using the Wentzel-Kramers-Brillouin approximation.It is shown that any one of the thermodynamic quantities has three terms.The first term has the same form as that in flat spacetime,the second and the third terms are spin-dependent terms due to the spin fields.
 植物生态学报 植物生态学报 , 1994, Abstract: ？本文采用野外调查分析和室内实验相结合的方法，从不同方面初步探讨松嫩平原三个盐碱植物群落的生物生态学机制，实验和分析结果表明：(1)土壤盐碱含量是决定盐碱植物群落组成和分布的主导因素。在植物群落的生态分布上，表现出虎尾草群落、星星草群落和碱蓬群落对盐碱的耐性有逐渐增强的趋势。(2)在实验室控制条件下，群落的建群种碱蓬、星星草、虎尾草对盐碱生境的生理适应性依次减弱。(3)在盐碱含量不同的土壤上，星星草体内脯氨酸含量与土壤总含盐量，特别是土壤中Na+含量呈正相关，说明植物通过调节体内某些生理反应来适应盐碱生境。上述结果初步揭示了松嫩平原主要盐碱植物群落的生物生态学机制。
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