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Search Results: 1 - 10 of 92643 matches for " 林洲游 "
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土壤电阻率对特高压输电线路塔顶电位的影响
Influence of Soil Resistivity on the Potential of Tower Overhead in UHV Transmission Line
 [PDF]

龚坚刚, , 许杨勇, 赵深
Smart Grid (SG) , 2014, DOI: 10.12677/SG.2014.45029
Abstract:
本文建立了考虑电感效应和火花效应的等效接地体时变模型,搭建了特高压输电线路雷击仿真计算模型,来分析土壤电阻率对雷击特高压杆塔顶端时塔顶电位的影响规律。结果表明:当土壤电阻率较小时,塔顶电位随土壤电阻率增加而增加的速度较大,而当电阻率较大时,塔顶电位升高的比较平缓。应根据土壤电阻率情况做防雷设计。
This paper established the equivalent model of the inductance effect and the spark effect of the grounding connector when attacked by lightning current. Meanwhile, the article explored the lightning simulation calculation model of the ultra-high voltage transmission lines, and analyzed the influence between the resistance rate and the tower potential when hit by lightning. The result indicates that: when the resistance rate of the soil is less, the tower potential increases greatly with the increase of the resistance rate; and when the resistance rate of the soil is bigger, it increases gently. So it is necessary to design the lightning protection based on the resistance rate of the soil.
数列的几乎单调性和交错级数的重排
Series of Almost Monotonicity and Alternating Series Rearrangement
 [PDF]

, 陈韬
Pure Mathematics (PM) , 2014, DOI: 10.12677/PM.2014.41005
Abstract:
交错级数是数学分析的重点和难点,主要内容包括交错级数的收敛定理和证明过程。本文主要讨论交错级数的重排和数列之间的关系,通过给出数列的几乎单调性的定义来探究一个已收敛的交错级数在何种条件下重排之后依然收敛,并且给出相关证明。
Alternating series is a focal and difficult point in the mathematical analysis. It mainly includes the convergence theorems and the certification process. This paper focuses on discussing the relationships between the rearrangement and the alternating series. Through the definition of almost monotonicity of series, the study explores in what conditions that a convergent alternating series still be convergent when it is rear- ranged, and gives relevant proof.
一类分数阶微分方程解的性质探讨
Exploration on the Nature of Solutions for a Differential Equation of Fractional Order
 [PDF]

, 任洁
Pure Mathematics (PM) , 2016, DOI: 10.12677/PM.2016.61009
Abstract:
本文主要证明了一类分数阶非线性微分方程解的存在性和唯一性。文中用到的微分算子是Caputo分数阶微分算子。因这类方程的可解性是与一类Volterra型的积分方程的可解性等价,所以我们主要研究了与之等价的积分方程解的存在性和唯一性。我们通过Schauder不动点定理证明了积分方程解的存在性,用压缩映象原理证明了解的唯一性。
We prove existence and uniqueness of the solution of a nonlinear differential equation of fractional order. The differential operator is the Caputo fractional derivative. For the solvability of the equation is equivalent to a class of Volterra integral equation, we study the existence and uniqueness of the integral equation. We prove the existence of the solution of integral equation by Schau- der fixed point theorem and the uniqueness of the solution by contraction mapping principle.
一类超椭圆曲线上的快速除子标量乘

电子学报 , 2008,
Abstract: 除子标量乘是超椭圆曲线密码体制中的关键运算.基于单除子标量乘的思想,将Duursma与Sakurai给出的关于奇素数域上一类特殊超椭圆曲线上的一个除子标量乘算法推广到奇素数域扩域上更一般的此类超椭圆曲线上,得到了两个效率更高的公式化的除子标量乘新算法.这两算法所需的运算量比二元法降低12%以上.
海南陵水黎族数学教学现状分析
Current Situation Analysis for the Li’s Mathematics Teaching in Hainan Lingshui
 [PDF]

, 思芸
Advances in Education (AE) , 2016, DOI: 10.12677/AE.2016.61007
Abstract:
本文从海南陵水黎族自治县的五所中学课堂教学实际出发,通过发放问卷,从教材的处理、课堂提问、课堂讨论以及对练习处理等方面入手,分析教师在教学过程中如何处理学生在学习上的主体性,是否最大化的健全促进学生的全面发展,开放课堂,培养学生的创新能力。
Based on the classroom teaching practice of five middle schools from Li’s autonomous county in Hainan Lingshui, the paper mainly analyzes how teachers handle students’ subjectivity in their studies during the teaching process, whether their teaching gets the maximal promotion of stu-dents’ overall development and whether they have their classroom open, aiming to cultivate stu-dents’ creativity in terms of questionnaire surveys concerning teaching material processing, classroom questioning, classroom discussion and exercise processing.
寿险业资产与保险配置对资产报酬率与损失率之纵横面资料分析
Panel Data Analysis on the Effect of Asset Returns and Loss Ratios on Life Insurance Company’s Assets and Insurance Allocation
 [PDF]

丽芬, 家伟
Statistics and Applications (SA) , 2013, DOI: 10.12677/SA.2013.21004
Abstract:

本文利用纵横面数据(Panel Data)欲探讨资产配置与保险配置对于资产报酬率及损失率之回归分析。首先,本文以各观察值之资产报酬率及损失率为分群变量,利用集群分析将研究样本区分为两集群的观察值,并对两集群的观察值进行主成分分析建立其资产配置与保险配置之模型,最后藉由纵横面数据分析较适当之回归模型,观察资产与保险配置对资产报酬率及损失率之影响因素。研究结果发现资产报酬率较适用随机效果模型,损失率较适用固定效果模型。再者,资产配置与保险配置间存有交互影响,而不同集群的观察值与资产配置及保险配置也存有交互影响,且影响资产报酬率及损失率之变项也有差异。
By collecting Panel Data, this study investigates how life insurance company’s asset and insurance allocations affect asset returns and loss ratio. First, the asset returns and loss ratio of each life insurance company each year are treated as response variables and cluster analysis is used to grouping the companies into observations of two groups. Then principle component analysis is applied to construct the model of asset and insurance allocations of observations of two groups. Finally, find the effects of asset and insurance allocations on asset of returns and loss ratio by regression model for panel data. The findings show that ROA is applicable to the random model and the loss ratio is applicable to the fixed effect model. Furthermore, there exist the interaction effects between asset allocation and insurance allocation. The two groups of companies also exist interaction effects on asset and insurance allocation. Finally, there exist different asset and insurance allocation effect on asset returns and loss ratio.

关于推广型矩阵秩等式的注记
Notes for the Generalization of the Matrix’s Rank Equalities
 [PDF]

, 陈人珍
Pure Mathematics (PM) , 2014, DOI: 10.12677/pm.2014.44015
Abstract:

在本文中,我们运用分块矩阵及其初等变换将一类矩阵秩的等式进行再推广。
In this paper, by using the block matrixes and their elementary transformation, we generalize the rank equalities of a class of matrix.

紧螺栓联接的非线性计算理论

福州大学学报(自然科学版) , 1989,
Abstract: 在实验的基础上,建立了在受轴向载荷紧螺栓联接中,被联接件的受力与变形的非线性方程。导出了各项计算公式,并通过实例对传统的线性理论与非线性理论进行比较,结果表明非线性理论较为符合实际。
pvc与ptfe圆板表面电荷分布研究

武汉理工大学学报 , 1995,
Abstract: ?本文叙述了确定带电绝缘体表面电荷分布的新方法,给出了绝缘体圆板的电位分布,推导出表面电荷服从指数分布的公式。通过pvc与ptfe两类材料的实验证明,这一理论与实验结果符合很好。
农村妇女远嫁现象研究——河北省香河县外来妇女情况调查

社会学研究 , 1992,
Abstract: 作者通过对农村妇女远嫁的渠道、形成机制、婚后生活状况及远嫁现象的社会影响等问题的系统调查研究,作出如下判断:改革开放拉开了地区间的发展差距,地区间的障碍因素的弱化与人们的思想观念的更新,共同促进了农村妇女远嫁现象的发展。因此农村妇女大批远嫁可以说是改革开放的必然结果。外来妇女对环境有很强的适应能力,对生活的满意度普遍较高。远嫁现象的社会影响复杂且深远,利弊并存,但利大于弊。
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