论初中物理“大气压强”的教学

在如今的物理教学课程中,大气压强程序的教学是相对比较难的一个知识点,大多数学生对这一知识点理解的不够透彻.本文主要是根据托里拆利实验,设计了一套比较系统的教学方案,来讨论大气压强在物理教学中程序的教学,从而帮助学生更好地开发学生想象,学好大气压强这一相对较难的课程,让学生理解的更加透彻.     

大气压强与气体压强 重量模型与碰撞模型——例析因初高中教材衔接不紧而产生的教学疑点

在高中物理“气体压强”教学中，通常会遇到“大气压强”问题，教师通常会建立两种压强模型来帮助学生理解有关问题，这两种模型分别是“重量模型”和“碰撞模型”，由于初高中教材衔接不够紧密，所以，学生搞不清“气体压强”和“大气压强”有什么区别，也搞不清“重量模型”和“碰撞模型”有什么关系，教师如不及时化解，就会影响学生对现有知识...     

"研究液体的压强"的探究式教学设计

"研究液体的压强"是现行初中物理教学中一个重要的知识内容.该节教材是前面压力、压强知识的深化学习和理解,是学习后续知识"大气压强、浮力、阿基米德原理"等知识的桥梁和纽带.而"研究液体的压强"实验的教学,无疑是搞好液体压强知识教学的重要前提.该实验教学的意义不仅仅如此,更重要的是,只要教师教学方法正确、引导得当,他能够教给学生研究物理问题的方法,培养学生多种探究能力.     

第12讲 压强与浮力专题复习

本知识板块的主线是“压强”,分为固体压强、液体压强和大气压强,同时它也是浮力知识的基础．本知识板块的重点是压强的改变方法及压强大小的计算．压强知识点始终是中考的主要内容之一,一方面它综合了压力的概念、受力分析的知识,同时压强知识在生活与生产实际中有着广泛的应用．因此在各类题型中都出现了压强的考点．     

“大气的压强”教学设计

设计思想“大气的压强”是初中《物理》第一册第十一章第一节的内容 ,这节课是在学生掌握了压强的概念、压强的公式和单位、液体压强的特点和规律以及液体内部压强的公式之后 ,学习的又一压强方面的知识 .这节课主要讲的是关于气体压强中大气压强的初步知识 ,与前面所学的固体压强 ,液体压强一起构成了一个相对完整的体系 .通过这节课的学习 ,要求学生理解大气压强的存在和大气压强产生的原因 ,会用大气压强解释简单的现象 ,并且知道托里拆利实验说明了什么 ,知道大气压强的大小 .由于学生在学习这节课之前已知道压强以及大气压强产生的原因…     

第12讲 压强和浮力专题复习

本知识板块的主线是“压强”,分为固体压强、液体压强和大气压强,同时它也是浮力知识的基础．本知识板块的重点是压强的改变方法及压强大小的计算．压强知识点始终是中考的主要内容之一,一方面它综合了压力的概念、受力分析的知识,同时压强知识在生活与生产实际中有着广泛的应用．因此无论是填空、选择、实验探究还是综合应用题中,都会出现有关压强的考点．     

浅析初中物理“压力与压强”内容的运用

"压力与压强"这一内容既是力学中的重要内容,又是初中物理教学的重点和难点之一。不过在教学过程中,笔者发现,学生对"压力和压强"这一内容的掌握和运用情况不尽如人意。为了以学生为主体,激发他们的学习兴趣,让他们灵活运用"压力与压强"的相关知识解决实际问题,笔者结合教学实践,探讨"压力与压强"这一内容的实际运用。一、明确概念压力,即垂直作用在物体表面上的力,它的方向总指向受力物并与受力物垂直(F=PS)。压强,即     

高中生地理自主学习能力培养之探究——以“热力环流”一课为例

在地理的知识体系中,大气知识对学生来说还是比较难于掌握的。由于大气知识是学习大气运动最为基础的前提,因此,学生想要学习好大气运动这部分知识内容,大气知识的有效教学就显得尤为重要了。同时,学好这部分内容同样也可以为下一章节大气环流的学习打下良好的基础,起到分散降低教学难度、便于学生理解学习的作用,带动学生自主学习的主动性,激发学生的学习兴趣,培养学生的自主学习能力,对学生的能力培养具有良好的促进作用。     

浅谈“压强”考点的突破

1中考热点、命题趋势以及复习对策本章中考的热点是关于压强的概念、液体压强的特点以及大气压强的应用，近年新课标中考试卷出现流体压强与流速关系的题目也不少。本章在中考命题中注重生活实际的应用，探究性试题仍然是热点题型，本章与质量、密度、浮力的综合考查也常出现，对于流体压强的考查也是从生活实际出发，试题难度较小，今后在复习中应加强所学知识与生活应用的联系，利用压强知识多解释一些实际问题，还要学习探究实验的一般思路和方法。     

大气压强产生原因的是与非

初中物理教材第一册P130对大气压强的产生是这样描述的：“空气，也像液体那样，受到重力的作用，而且能流动，因而空气内部向各个方向都有压强，大气对浸在其中的物体的压强叫大气压强．”由此段表述，在初中我们不难得出并强调“大气压是因为空气受重力而产生的”的结论．这时有的初中学生已经对大气压强与类似笔管内气体压强的区别和联系有了强烈的知识需求，但由于知识水平的限制，     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

汉字倒说

汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.     

团图为数的图中的闭团贯数

Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F.     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

钱生钱!

我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了     

Social and Cultural Influence on Word Meaning

Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language.     

Inequalities for inscribed simplexes

The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex.