Nullor网络一种新的拓扑分析方法

从节点导纳矩阵出发 ,定义了电压图、电流图 ,把节点导纳矩阵的代数余子式表示为电压图、电流图中完全树的树支导纳乘积之和     

图的矩阵表示及性质

图可以用集合来定义,也可用图形来表示,此外,还可用矩阵来表示。作者通过介绍图的矩阵表示(关联矩阵、邻接矩阵、可达矩阵),给出用代数方法研究图的性质,也便于用计算机处理图。但必须将图的顶点或边标定成顺序,使其成为标定图。此外还介绍度矩阵的相关性质。     

用关联矩阵求解物品分区

由图的关联矩阵,通过逐次极大全1子矩阵序列或元素全为1的极大对角块矩阵,给出了物品分区的代数求法,并进行了理论证明．     

混合图、混合树及Nullor网络拓扑分析

对Nullor网络 ,定义了混合图、混合树 ,并把不定导纳矩阵Yind 的一、二阶代数余子式表示为混合图中混合树的树支导纳乘积之和     

关于矩阵运算的教学研究

矩阵是高等代数的重要研究对象,是高等代数中学习其他知识点的重要工具,学好矩阵是学好高等代数的前提条件。文章以矩阵运算的教学为例,将矩阵的运算与大家熟知的数的运算相类比,使学生更容易理解与掌握矩阵运算的相关知识。     

矩阵的一般代数等价与相似性

给出了矩阵的一般代数等价的定义,该定义是通常矩阵相似概念和代数等价概念的推广,并揭示了这一类矩阵的一个特征,证明了若矩阵Am与Bn是一般代数等价的,则它们有公共的特征值。同时讨论了矩阵相似、代数等价和广义相似之间的关系,给出了它们的一些性质。     

连通图的一种简单判别法

利用代数方法,给出无向图为连通图的充分必要条件,进一步得到判别“0—1”正线对称矩阵可幺化的简便方法。     

对合矩阵决定的若当全矩阵代数

定义了对合矩阵决定的矩阵代数的概念,并用代数方法和技巧证明了若当全矩阵代数是由对合矩阵决定的.作为该结论的一个应用,得出了全矩阵代数上的稳定单位阵和保对合矩阵的可逆线性映射一定是若当自同构.     

BCK-代数的Ω-模糊代数理想

给定一个集合Ω,引入了有界可交换的BCK-代数的Ω-模糊代数理想之概念,研究了它的一些相关性质,并给出了它几个特征,讨论了有界可交换的BCK-代数的Ω-模糊理想与Ω-模糊代数理想的关系．讨论了有界可交换的BCK-代数的模糊代数理想与Ω-模糊代数理想的相互构造．     

关于全矩阵代数的几类子代数的中心

根据有限维代数的理论以及域K上矩阵的性质，给出域K上全矩阵代数Mn(K)的子代数对角矩阵代数Dn(K)、若当代数Jn(K)、上三角矩阵代数Tn(K)以及独生子代数K[A]的中心。     

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.     

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.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

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.