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二元函数求极限是高数中的难点;本文给出7种求二元函数极限的方法,并进一步给出极限一定不存在的3类二元函数. 相似文献
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何挺 《安顺师范高等专科学校学报》2005,7(2):80-83
在二元函数极限中,学者易习惯性地受一元函数极限影响,忽略二元函数极限定义中的要求,常出现一些不符题意的做题方法.为此,作者特指出某些书中求二元函数极限易于出现的问题及应用海涅归结原则如何求解. 相似文献
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在二元函数极限中,学者易习惯性地受一元函数极限影响,忽略二元函数极限定义中的要求,常出现一些不符题意的做题方法。为此,作者特指出某些书中求二元函数极限易于出现的问题及应用海涅归结原则如何求解。 相似文献
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二元函数求极限是高数中的难点,现归纳了6种求二元函数极限的方法,分别为:直接证明、先估值后证明、利用二元函数的连续性、用无穷小量与有界变量的乘积仍为无穷小量的结论、用重要极限limx>0sinx=1、用两边夹定理. 相似文献
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二元函数极限计算方法研究 总被引：2，自引：0，他引：2
符兴安 《楚雄师范学院学报》2003,18(6):20-22
本文主要讨论两个方面的问题。一是二元函数的重极限的计算方法，二是重极限的不存在判别法。 相似文献
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通过对社会需求、教师教学方法、学生学习方法三个方面的现状进行需求分析,作者提出了一些针对现状的适应我国高校理工科学生学习的教师教学与学生学习方法。文中主要从如何引导高校理工科学生的应用创新展开了教学方法研究,提出了从授课对象、授课方法、授课手段三个方面创新教学,以满足目前社会对学生知识结构的需求和学生对所学知识方法的需求。最后从社会需求、教师教学方法、学生学习方法三个方面分析了引导学生应用创新应该深层次思考的问题。 相似文献
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研究方法和写作方法是教育硕士必须具备的基本素养,同时也是教育硕士毕业论文中最为薄弱的环节。方法意识淡薄、研究方法单一或成为摆设、研究方法应用不科学不恰当、写作方法不符合学术研究范式等是其毕业论文方法方面的主要问题。根据专业学位研究生的特点,可以通过明确研究方法类课程教学定位、采用案例式教学和改革论文指导模式等多种途径培养教育硕士的方法意识。 相似文献
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INTRODUCTION A number of problems involve flows of gases orliquids over bluff bodies such as air flowing over carsand airplanes and wind blowing over bridges andbuildings. Many experiments or simulations havefocused on the above problems. In those phenomena,flows will not follow the solid bodies completely, butseparate from them and create wakes. The generationand shedding of large coherent vortex structures dueto flow separation make the bluff body flows complexand very difficult … 相似文献
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冉翠香 《吕梁高等专科学校学报》2007,23(1):3-6
植物基因工程中目的基因的转化方法有间接转化法和直接转化法,主要阐述各种转化方法的原理、特点,以期为植物转基因方法的选择提供帮助. 相似文献
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离散变量结构优化设计算法研究综述 总被引：2，自引：0，他引：2
石连栓 《天津工程师范学院学报》2001,11(1):5-9
对离散变量结构优化设计的算法作了总结，这些算法被分成传统的方法和现代方法。对其中的一些算法作了描述，如圆整法、相对差商法、模拟退火算法、遗传算法、Tabu搜索算法。指出了拓扑优化存在奇异最优解问题，并介绍了奇异最优解的处理方法。 相似文献
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Therese D. Pigott 《Educational Research and Evaluation》2013,19(4):353-383
This paper reviews methods for handling missing data in a research study. Many researchers use ad hoc methods such as complete case analysis, available case analysis (pairwise deletion), or single-value imputation. Though these methods are easily implemented, they require assumptions about the data that rarely hold in practice. Model-based methods such as maximum likelihood using the EM algorithm and multiple imputation hold more promise for dealing with difficulties caused by missing data. While model-based methods require specialized computer programs and assumptions about the nature of the missing data, these methods are appropriate for a wider range of situations than the more commonly used ad hoc methods. The paper provides an illustration of the methods using data from an intervention study designed to increase students’ ability to control their asthma symptoms. 相似文献
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陈伟强 《四川师范大学学报(社会科学版)》2012,(1):59-66
刑法中的非刑罚处罚方法可界分为普通非刑罚处罚方法、特殊非刑罚处罚方法、人民法院适用的非刑罚处罚方法和行政机关适用的非刑罚处罚方法。普通非刑罚处罚方法存在功能缺陷,为弥补功能缺陷,应完善其体系,增加普通非刑罚处罚方法种类。教育矫正是特殊非刑罚处罚方法应有的功能,现有的特殊非刑罚处罚方法种类稀少,难以有效发挥教育矫正功能,应当增加其种类;特殊非刑罚处罚方法在适用对象、适用原则上均有不足,需要完善。行政机关适用非刑罚处罚方法有悖法理,应将行政机关适用的部分非刑罚处罚方法植移入人民法院适用的非刑罚处罚方法体系之中。 相似文献
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Jenna Copella 《教育实用测度》2013,26(1):73-76
Combinations of five methods of equating test forms and two methods of selecting samples of students for equating were compared for accuracy. The two sampling methods were representative sampling from the population and matching samples on the anchor test score. The equating methods were the Tucker, Levine equally reliable, chained equipercentile, frequency estimation, and item response theory (IRT) 3PL methods. The tests were the Verbal and Mathematical sections of the Scholastic Aptitude Test. The criteria for accuracy were measures of agreement with an equivalent-groups equating based on more than 115,000 students taking each form. Much of the inaccuracy in the equatings could be attributed to overall bias. The results for all equating methods in the matched samples were similar to those for the Tucker and frequency estimation methods in the representative samples; these equatings made too small an adjustment for the difference in the difficulty of the test forms. In the representative samples, the chained equipercentile method showed a much smaller bias. The IRT (3PL) and Levine methods tended to agree with each other and were inconsistent in the direction of their bias. 相似文献
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Marta Licardo 《欧洲特需教育杂志》2019,34(1):66-82
The purpose of this study is to evaluate the quality of instruction among professionals who implement additional professional support for students with special needs in Slovenia, with a focus on methods for learning to learn. A total of 1863 professionals with various job positions participated in the study. The results revealed that seven groups of professionals most often use methods for achieving standards in different learning subjects. The largest significant differences are in methods for developing social emotional skills, methods for rehabilitation and compensation of disabilities and methods for development of attention and concentration. The results also revealed that subject teachers use most of the methods significantly less than other professionals, which rise concerns about the quality of additional professional support in the group of subject teachers. 相似文献