分子点群的确定探索

章讨论了分子属于什么点群，怎样正确确定分子的点群问题。     

群目标重心跟踪过程中的群合并算法研究

在目标跟踪过程中,当目标满足群目标条件时,多目标跟踪由于跟踪波门交叉严重,往往会误相关,因此传统的多目标跟踪方法在群目标跟踪中并不适用。为了能够有效跟踪群目标,及时获得群目标的动态信息,研究人员提出了群目标重心跟踪的思想。合并是群的一大特征,也是群跟踪过程中的一大难点。在群重心跟踪算法基础上,把合并分为点迹与航迹合并,以及航迹与航迹合并两种情况。后者采用双门限方法判断群是否可以合并,并分析了群跟踪门的构建过程。仿真验证结果表明,在群合并过程中,依然能够稳定跟踪。因此,该算法能够有效跟踪群目标,及时获取群目标的动态信息。     

Fuzzy集公理化系统下的F群

以基本Fuzzy点的原始概念,定义了Fuzzy广群,Fuzzy半群,Fuzzy含么半群,Fuzzy群,讨论了Fuzzy群的基本性质及它们与其λ截集的关系.     

山东港口资源整合模式对河北港口群建设之借鉴

通过对山东半岛港口群发展战略的借鉴和经验的总结,结合河北省港口群现状,对目前我省港口群存在的主要问题进行客观分析,提出了促进港口群协同发展的几点建议.     

活跃在解析几何中的“动点群”

什么叫“动点群”?就是题中的动点不止一个。而是有多个，某一动点运动时带动或制约其他一些点的运动，这些动点组成的群体称之为动点群．由于动点的增多，牵涉面加大，如果不掌握一些方法，往往在纷繁复杂的情况下理不出头绪来，解析几何“动点群”在高考中也时有出现，现就“动点群”下求某一动点轨迹     

对作出分子点群乘法表的几点讨论

本文对量子化学中群表示理论的给定分子点群的乘法表进行了讨论.考虑了分子主轴的旋转方向、分子中原子编号的次序以及分子点群中对称操作的先后次序对乘法表结构的影响,并将所举例中可能得到的8张乘法表分为两类.找出了两类表之间相互关系,并给出了合适的方法和建议.     

基于良心算法的点群选取方法研究

点群选取是制图综合中最基本的问题之一。采用Kohonen学习的修改算法,在竞争学习中加入良心机制,对输入的空间数据形成较好的概率密度函数近似,从而实现比例尺缩小时点群的自动选取。实践证明该方法进行点群选取能够保持原始数据的空间分布特征。     

活跃在解析几何中的动点群

什么叫“动点群”？就是题中的动点不止一个，而是有多个，某一动点运动时带动或制约其他一些点的运动，这些动点组成的群体称之为动点群。由于动点的增多，牵涉面加大，如果不掌握一些方法，往往在纷繁复杂的情况下理不出头绪来。现就“动点群”下求某一动点轨迹问题，以及求最值等问题谈一些方法。     

“双高计划”背景下高职院校特色高水平专业群建设模式与路径

高职院校特色高水平专业群的建设模式主要有依托共同基础构建专业群、围绕核心专业构建专业群、面向职业岗位构建专业群、立足区域产业构建专业群四种。为了强化特色高水平专业群建设,高职院校可以沿以下路径开展相关工作：以双师团队为保障点,夯实共同基础;以专业优势为发力点,突出建设特色;以课程重构为基础点,助推岗位适配;以产教整合为切入点,强化服务功能。     

备考QQ群,管用

女儿今年参加高考。对门邻居阿姨过来串门,递给我一张纸条,上面写了一个QQ群号。该群是家长们围绕家中的考生质疑问难的备考交流群。阿姨的外孙也是高考生,听阿姨讲,群里每晚7点到9点非常活跃,是交流的黄金时间。入群第一天晚上,就有位妈妈发了＂求助,求助!＂。     

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.