浅议用向量法解决正弦交流电路的有关问题

不同学科间的相互渗透、交叉和融和是21世纪科学发展的主要趋势.教师应随着时代的发展,不断地对学科之间的交叉应用进行探索,这就是学科发展意义上的"与时俱进".本文就如何用数学的方法解决正弦交流电路的有关问题进行了较详细的论述.首先介绍了向量的概念,然后阐述了如何用向量法解决正弦交流电路的问题,并以实例说明了向量法解决正弦交流电路的优越性,最后指出了应用向量法的注意事项.     

浅议用向量法解决正弦交流电路的有关问题

不同学科闻的相互渗透、交叉和融和是21世纪科学发展的主要趋势。教师应随着时代的发展，不断地对学科之间的交叉应用进行探索．这就是学科发展意义上的“与时俱进”。本文就如何用数学的方法解决正弦交流电路的有关问题进行了较详细的论述。首先介绍了向量的概念．然后阐述了如何用向量法解决正弦交流电路的问题，并以实例说明了向量法解决正弦交流电路的优越性，最后指出了应用向量法的注意事项。     

浅谈相量法在快速分析计算正弦交流电路问题中的应用

相量法是分析正弦交流电路的重要方法,文中介绍了相量的有关概念,阐述了如何利用相量法快速解决正弦交流电路的常见问题,并以实例说明相量法在解决交流电路相关问题时的优越性和快捷性。     

Sin，为什么你叫正弦——记一次HPM视角下的教学探索与心得

在HPM的视角下,通过解释为何把sin这种对应关系命名为正弦,进而用相似三角形推出正弦定理,展示了将数学史融入数学教学的一种途径及对其的思考与实践．     

三倍角正余弦公式及其应用

本文现将三倍角的正弦、余弦公式及其应用简介如下。     

正弦定理的一个优美的证明

正弦定理:若△ABC的外接圆⊙O的半径为R,则证明:先证 .分三种情况证明.     

非正弦电路中无功功率的定义和物理意义

学术界有关无功功率理论的争议由来已久，却至今未取得统一的认可。本文研究和分析了非正弦情况下单相无功功率和三相非正弦无功功率的各种定义，讨论了各种定义的优缺点和物理意义，指出了人们关于无功功率概念的误区。     

正弦定理的应用

本文概述了正弦定理在某些方面的应用 .     

正弦定理和余弦定理的应用

本文介绍教学中正弦定理和余弦定理的应用。     

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?     

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.     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

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.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.