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许多动力学问题在一般情况下都有几种不同的解法,解动力学问题时,多想想用不同的方法解题,对巩固基础知识,沟通各基本概念的联系,无疑是大有脾益的。理论力学中的动力学问题往往既可用分析力学的方法来解题,又可用矢量力学的方法来解题。用分析力学的方法来解题时,可分别用拉格朗日方程、正则方程或哈密顿原理来求解;用矢量力学的方法来解题时,可分别用动量定理(或牛顿定律)、动学矩定理、动能定理(或机械能守恒定律)来求解。当分别用这些方法来解题时,要明确适用范围、解题 相似文献
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《中学生数理化(高中版)》2020,(3)
<正>高中物理力学综合题中一般含有多个物理过程和多个研究对象,同学们在求解时,往往需要采用多个物理概念与规律结合的方式才能破解。求解力学综合题可以用到哪些技巧呢?下面举例分析。一、借鉴整体法解决力学综合问题整体法的核心思想就是将受力物体本身视为一个整体,并将系统内物体之间可能存 相似文献
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樊新权 《贵州教育学院学报》2004,15(2):20-21,35
用矩阵方法对点的合成运动进行分析、研究，推导出求解点的合成运动的矩阵计算公式，这些公式有助于理论力学在计算机上的应用，并对提高理论力学的教学质量可起到积极的作用。 相似文献
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在力学解题过程中,一道题的解题思路是多种多样的,同样学生也要从不同角度进行思考。本文主要讨论了一题多解在力学教学中的应用,同一道力学问题用不同的方法去理解和分析,最后得出的结论是一样的,并且用一个问题同时引发出不同的问题,再用相似的解题方法进行求解。一题多解既能够加深学生对知识的理解,又能提高学生解决问题的能力。 相似文献
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易方元 《四川职业技术学院学报》2005,15(3):86-88
用微元思想解决静力学、运动学、动力学等各个方面的力学竞赛题，分析微元所遵循的物理规律，建立物理模型，从而建立等式求解，使复杂问题简单化。 相似文献
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David Kember 《Distance Education》1982,3(2):207-225
Three methods are described for offering the practical work for external science courses: on‐campus residential school sessions, the use of centres by groups of students in a neighbourhood and the use of kits for individual study in the home. The advantages and disadvantages of each method are discussed and examples are given of each method in operation. 相似文献
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文章首先对视线跟踪技术进行了文献综述,然后给出了网络课程界面测试中的应用案例,探讨了视线跟踪技术在网络课程界面测试中的应用策略、方法和需要注意的问题。通过本测试发现：（1）视线跟踪技术能够非常直观地显示出学习者感兴趣的区域以及学习者对哪些区域却视而不见;（2）视线跟踪技术与访谈、观察方法结合使用,能够提供更加丰富的测试数据,这样得出的测试结果相较单一方法的使用更有说服力;（3）视线跟踪技术是其他可用性测试方法的有益补充,能够回答传统测试方法所不能有效回答的问题。 相似文献
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Stacey B. Griner Erika L. Thompson Cheryl A. Vamos Rachel Logan Coralia Vázquez-Otero Ellen M. Daley 《Sex education》2017,17(6):647-666
Sexually transmitted infections (STIs) may be prevented through the use of barrier methods, but rates of use among US college students are low. Previous research focuses on individual-level factors influencing barrier method use, but few studies consider community-level influences. This study examined consistency of barrier use by college institutional characteristics including region, enrolment, control (public or private), locale, type, or religious-affiliation. Data from the Autumn 2013 US National College Health Assessment-II (n?=?13,400; 57 colleges) were analysed. Prevalence ratios were calculated for consistent barrier method use during vaginal, oral and anal sex. Consistent barrier use during vaginal sex was associated with enrolment at a college in the Northeast, compared to the West (aPR: 1.16 [95%CI 1.01–1.29], p = 0.04), and enrolment at larger institutions compared to smaller colleges. Attending a private college or university was associated with more consistent barrier method use during vaginal sex and anal sex compared to those attending a public college or university. Findings demonstrate differences in barrier method use by institutional-level factors, and future research should consider the role of the college community. US college-based health promotion should include barrier method interventions at multiple levels if STIs are to be reduced. 相似文献
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《Chinese Education & Society》2013,46(4):47-49
The following excerpts are from the Primary School Experimental Textbook on Mathematics (vol. 1), written by Hanzhou Normal College Educational Science Laboratory and the Hanzhou Uptown Three-In-One Research Group and published in July 1980. The three-in-one method espouses teaching arithmetic through the simultaneous mental arithmetic, the paper-and-pencil method, and the use of the abacus simultaneously. The conventional curriculum treats the use of abacus as a separate subject; it is usually not taught until grade three. In the three-in-one method, the abacus is taught from the first grade along with an understanding of the concept of numbers. In the following example, students are taught addition and subtraction within 100. 相似文献
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唐海燕 《湖南师范大学教育科学学报》2007,6(3):97-100
课程资源是指一切有利于实现课程目标的各种因素.基础教育课程改革提出的要求是积极开发并合理利用校内外各种资源.开发和利用高中思想政治课程资源对于丰富教学活动、激发学生的学习兴趣、转变学生的学习方式和促进教师的业务水平与学生的全面发展有着十分重要的意义.我们应充分开发和利用校内外的各种素材性和条件性课程资源为教学服务. 相似文献
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运用混合研究法调查高校学生对于英语辅助性翻译软件的使用情况,考察对软件使用的影响因素。研究发现,高校学生对翻译软件的使用率很高,专业、年级以及英语水平是影响软件使用的主要因素,软件使用的差异性是由于学生对语言的理解程度、翻译学习观念及对翻译软件的了解程度不同所致。 相似文献
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以保定市满城县为例,运用地理信息系统方法,结合数理统计分析,提取该区域2000年土地利用和土壤侵蚀强度的相关信息,针对不同土地利用条件下的土壤侵蚀状况进行定量分析.不同的土地利用方式直接影响着土壤侵蚀强度,选择合理的土地利用方式,对于优化配置有限土地资源,有效控制土壤侵蚀具有重要作用. 相似文献
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本文给出了利用图解分段确定卷积积分区间的一种方法,并举例说明了其应用及推广.利用本方法,只要知道被卷积两函数的有值区间端点,就能有规律地快速确定卷积积分中自变量t和哑变量τ的取值区间,计算的结果为闭合形式.该方法能有效地克服积分区间(或求和区间)的重复和遗漏问题,特别是在多分段有值函数卷积的计算中更显示出其优越性. 相似文献
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Ning Wang 《Journal of Educational Measurement》2003,40(3):231-253
This article provides both logical and empirical evidence to justify the use of an item-mapping method for establishing passing scores for multiple-choice licensure and certification examinations. After describing the item-mapping standard-setting process, the rationale and theoretical basis for this method are discussed, and the similarities and differences between the item-mapping and the Bookmark methods are also provided. Empirical evidence supporting use of the item-mapping method is provided by comparing results from four standard-setting studies for diverse licensure and certification examinations. The four cut score studies were conducted using both the item-mapping and the Angoff methods. Rating data from the four standard-setting studies, using each of the two methods, were analyzed using item-by-rater random effects generalizability and dependability studies to examine which method yielded higher inter-judge consistency. Results indicated that the item-mapping method produced higher inter-judge consistency and achieved greater rater agreement than the Angoff method. 相似文献
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用数学方法解析了"田忌赛马"管理谋略的奥秘,在此基础上提出了这种管理谋略的数学模式,并分析了它的特点和优点及其产生的原因,为进一步应用和推广这种管理谋略提供了具体的参照系和比较科学规范的途径和方法。 相似文献