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1.
本文对西方交际方式与中国传统教学方式进行了比较,旨在探讨如何把这两种方式有效地结合起来,并找到一种在外语教学课堂中行之有效的方法来教授第二语言.  相似文献   

2.
主要讲述零售企业售价金额核算含增值税的帐务处理,两种处理方法,其中一种方法又分为两种。对这几种帐务处理进行比较,提出各自优点,然后提出自己的倾向、观点、看法。 对这两种帐务处理运用例题来加以说明  相似文献   

3.
在微积分的酝酿时期,笛卡儿和巴罗两位数学大师分别提出求曲线切线的方法:笛卡儿圆法和巴罗微分三角形.本文给出了这两种方法的内容,并对两种方法进行了比较、分析、研究.  相似文献   

4.
陈百华 《数学教学》2012,(12):19-21
文[1]对不等式恒成立求参数取值范围的两种方法进行了探讨,并指出这两种方法对于一些常规的、不太复杂的题目是行之有效的.但是正如文[1]所说,用这两种方法来处理2010年的几道高考题遇到了困难,要么计算过程繁琐,从而半途而废,要么很难解决,陷入死胡同.究其原因是这两种方法过于重视方法  相似文献   

5.
李冬燕 《海外英语》2011,(6):204-205
归化和异化作为两种主要的翻译策略在翻译中得到比较普遍的运用,它们也是人们在讨论翻译标准的时候的焦点。该文通过对这两种翻译策略的定义的阐述和应用的比较,指出对这两种策略的选择主要是要根据译者所处的社会文化、翻译目的和个人风格来决定,同时对翻译中如何选择这两种策略进行尝试性的分析。  相似文献   

6.
迄今生成树棵数有两种求法,一是cayley公式,一是用关联矩阵来求.但这两种方法对于顶点个数和边的个数比较多的连通图使用起来不方便.本文给出两个定理,这两个定理和用关联矩阵法结合起来可以大大化简计算过程.且本文的定理2是cayley公式的推广.  相似文献   

7.
不用极限定义导数已有两种不同方式的实现:差商有界的函数的乙函数和强可导函数的导函数.本文利用这两种方法对一些导数公式的验证过程进行了比较.  相似文献   

8.
从世界范围来看,目前企业合并的会计方法有购买法和权益法两种方法.这两种方法在实质、理论基础、合并后企业股权结构、适用范围、会计报表的影响上都存在着根本区别.本文即对企业合并的两种会计处理方法进行比较,然后针对我国企业合并应采取的会计处理方法提出一些思路.  相似文献   

9.
在铸铁生产中,炉前检测铁水化学成分主要有仪器检测和经验检测两种方法.其中,仪器检测有直读光谱仪测定法和热分析法;经验检测主要指铸造企业凭经验或借助三角试块白口宽度来预测铸铁牌号或成分的方法.分析了如何使用这两种检测方法对铁水进行炉前检测.  相似文献   

10.
本文对“测定杨氏模量”实验进行了改进。用读数显微镜替代光杠杆来测金属丝微小长度的变化。用具体实验数据对这两种方法的相对误差进行比较,从而得出这种改进的优越性。  相似文献   

11.
电力GIS系统中电力设施图形表达   总被引:1,自引:0,他引:1  
在电力GIS系统项目实施过程中存在着诸如地理信息与电力信息结合不紧密、数据量过大致使系统效率降低等问题。引发这些问题的根源在于电力GIS系统中图形数据的表达和组织上存在某种矛盾。本文主要探讨了电力GIS系统中电力设施图形表达上的2大难点问题,即电力线路与开关型电力设备(如杆上开关)的图形表达问题,并针对电力拓扑关系的表达提出了图形拓扑法和拓扑表法2种实现方式。  相似文献   

12.
Fully automatic finite element (FE) modelling of the fracture process in quasi-brittle materials such as concrete and rocks and ductile materials such as metals and alloys, is of great significance in assessing structural integrity and presents tremendous challenges to the engineering community. One challenge lies in the adoption of an objective and effective crack propagation criterion. This paper proposes a crack propagation criterion based on the principle of energy conservation and the cohesive zone model (CZM). The virtual crack extension technique is used to calculate the differential terms in the criterion. A fully-automatic discrete crack modelling methodology, integrating the developed criterion, the CZM to model the crack, a simple remeshing procedure to accommodate crack propagation, the J2 flow theory implemented within the incremental plasticity framework to model the ductile materials, and a local arc-length solver to the nonlinear equation system, is developed and implemented in an in-house program. Three examples, i.e., a plain concrete beam with a single shear crack, a reinforced concrete (RC) beam with multiple cracks and a compact-tension steel specimen, are simulated. Good agreement between numerical predictions and experimental data is found, which demonstrates the applicability of the criterion to both quasi-brittle and ductile materials.  相似文献   

13.
In this paper, primal-dual interior-point algorithm with dynamic step size is implemented for linear programming (LP) problems. The algorithms are based on a few kernel functions, including both self-regular functions and non-self-regular ones. The dynamic step size is compared with fixed step size for the algorithms in inner iteration of Newton step. Numerical tests show that the algorithms with dynamic step size are more efficient than those with fixed step size. Project supported by Dutch Organization for Scientific Research (Grant No.613.000.010)  相似文献   

14.
用于线性优化的基于核函数的动态步长原-对偶内点算法   总被引:1,自引:2,他引:1  
In this paper, primal-dual interior-point algorithm with dynamic step size is implemented for linear programming (LP) problems. The algorithms are based on a few kernel functions, including both serf-regular functions and non-serf-regular ones. The dynamic step size is compared with fixed step size for the algorithms in inner iteration of Newton step. Numerical tests show that the algorithms with dynaraic step size are more efficient than those with fixed step size.  相似文献   

15.
A meshless local discontinuous Petrov-Galerkin (MLDPG) method based on the local symmetric weak form (LSWF) is presented with the application to blasting problems. The derivation is similar to that of mesh-based Runge-Kutta Discontinuous Galerkin (RKDG) method. The solutions are reproduced in a set of overlapped spherical sub-domains, and the test functions are employed from a partition of unity of the local basis functions. There is no need of any traditional non-overlapping mesh either for local approximation purpose or for Galerkin integration purpose in the presented method. The resulting MLDPG method is a meshless, stable, high-order accurate and highly parallelizable scheme which inherits both the advantages of RKDG and meshless method (MM), and it can handle the problems with extremely complicated physics and geometries easily. Three numerical examples of the one-dimensional Sod shock-tube problem, the blast-wave problem and the Woodward-Colella interacting shock wave problem are given. All the numerical results are in good agreement with the closed solutions. The higher-order MLDPG schemes can reproduce more accurate solution than the lower-order schemes.  相似文献   

16.
通过对梯度法与模拟退火算法优缺点的分析,提出了一种梯度退火新型混合全局优化算法。该算法利用梯度法的快速寻优特性得到某一局部极值,然后采用模拟退火算法的全局搜索寻优能力跳出该局部极值,经过反复混合迭代最终获得全局最优解。仿真实验表明,该新型混合优化算法显著提高了求解全局优化问题的计算效率。  相似文献   

17.
18.
工业经济是影响绵阳科技城建设的关键因素。利用1999和2003年的经济资料,以四川和全国为参照区域,对绵阳工业经济进行SSM分析,认为绵阳工业经济不存在“行业衰退”,但存在工业结构断层化,基于全国参照区朝阳化、基于四川参照区夕阳化、整体竞争力川外弱势、基于全国参照区的结构性增长与结构性竞争力不对称等结构性瓶颈问题。进一步提出了解决绵阳工业结构瓶颈的主要措施。  相似文献   

19.
通过对氨法与石灰石-石膏法烟气脱硫技术特点的比较,论述氨法烟气脱硫技术应用于广西田东电厂2×135MW机组烟气脱硫技改工程的可行性;简单介绍了田东电厂氨法烟气脱硫的初步设计方案,为国内类似机组烟气脱硫改造工程提供参考方案和借鉴经验。  相似文献   

20.
We present a Monte Carlo (MC) method to simulate the scattering for medium within randomly distributed particles,discuss the convergence of this method by varying the size parameter ka, volume parameter ηand calculation parameter Ni, then compare this method with the classical iteration method with the same parameters. The calculation results showed that this method has good convergence and accords with the iteration method while consuming less CPU time. At the end of this paper, this method is used to discuss the visual light scatter in the c-Si/α-Si films.  相似文献   

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