关于Sn＋Fn和Sn＋Wn的均匀全染色

对于图G的正常k-全染色f称为G（V,E）的k-均匀全染色,当且仅当任意2个色类中的元素总数至多相差1.χet（G）=min{k｜G有k-均匀全染色}称为图G的均匀全色数.利用均匀边染色的相关结论,讨论并得到了图Sn＋Fn和Sn＋Wn的均匀全色数.     

Big Ideas: A review of astronomy education research 1974–2008

This paper reviews astronomy education research carried out among school students, teachers, and museum visitors over a 35‐year period from 1974 until 2008. One hundred and three peer‐reviewed journal articles were examined, the majority of whose research dealt with conceptions of astronomical phenomena with 40% investigating intervention activities. We used a conceptual framework of “big ideas” in astronomy, five of which accounted for over 80% of the studies: conceptions of the Earth, gravity, the day–night cycle, the seasons, and the Earth–Sun–Moon system. Most of the remaining studies were of stars, the solar system, and the concepts of size and distance. The findings of the review have implications for the future teaching of, and research in, the discipline. Conceptions of the Earth and the day–night cycle are relatively well‐understood, especially by older students, while the Moon phases, the seasons, and gravity are concepts that most people find difficult both to understand and explain. Thoroughly planned interventions are likely to be the most effective way of implementing conceptual change, and such studies have been well‐researched in the past 15 years. Much of this recent research has worked with constructivist theories resulting in methodological and theoretical insights of value to researchers and practitioners in the field. It is recommended that future research should work across the disciplinary boundaries of astronomy education at school and teacher education levels, and aim to disseminate findings more effectively within the education systems.     

‘Prizefight women’ or boxing as a mirror of Hemingway’s writing

ABSTRACT

Through the study of an article written by the young Hemingway in The Toronto Star Weekly dated from May 15th, 1920, these lines offer an additional insight into the writer’s personality, and more specifically the reasons for his admiration for boxing. Entitled ‘Prizefight Women’, this article relates the reactions of a crowd during a traditional pugilistic meeting featuring the ‘French Idol’ – Georges Carpentier. If throughout his life, Pap displayed his taste for this sport, it appears that the main reasons for his fascination were already revealed in this writing.     

对称三相电路中星—角连接的分析与计算

文章阐述了星—角连接中线电压和相电压的关系及线电流和相电流的关系,并阐明了在实际中如何来计算星—角连接电路的有关问题。     

基于A*算法的游戏地图最短路径搜索

介绍了常用的搜索算法思想,重点剖析了采用启发式A*算法实现大地图与复杂地形的最短路径搜索,在对估价函数特性进行分析的基础上,讨论了它的几个一般构造原则,并简要介绍一些常用的启发函数。     

欧洲历史上战争原因初探

中世纪欧洲最重要的战争原因是领土、霸权／征服和争夺权力等问题。近低早期、降领土和霸权／征服问题外，宗教问题也成为欧洲最重要的战争原因。主权时代，欧洲最重要的战争原因是领土问题和商业／航海问题。革命与民族主义时代，由于民族主义的兴起，民族问题成为欧洲最重要的战争原因。20世纪欧洲最重要的战争原因是维护政权自主生存和民族问题。     

闲话唐诗说七夕

七夕是中国民众传统岁时生活中的一个重要节日,也是历代文人士大夫竞相歌咏的对象。唐代七夕诗不仅数量很多,而且内容很丰富,是唐代七夕节俗的生动写照,反映了唐代七夕节的主要节俗活动及其文化内涵。     

青年“星你”热现象解读及其理性思考

韩剧《来自星星的你》不仅创下了收视率新高,更是引发了青年群体新一波的“韩流”热潮。在透视青年“星你”热现象的同时,我们更应该辩证思考其对于青年的影响。“星你”热浪的掀起,一方面对于青年的审美能力、创新适应性、文化视野与社会化进程都具有积极影响,但我们更应该关注的是它对于青年人生、价值观塑造过程中可能产生的负面因素,并提出一些可行性对策思考。     

先秦两汉时期司命神的文化考察

司命神在先秦两汉时期是主管人的生死、寿命和命运的神祗,它是官方与民间共同信奉的神灵.由于星占学的影响,司命神在汉代被进一步人格化,同时司命神被赋予更多的神性职能.司命神执行诸多职能的最终目的是为了劝勉人们诛恶行善,而民众信仰司命神多是为了求得延年益寿或消灾免祸.     

浅谈价格战对电商企业品牌建设的影响

本文从近期电商价格战事件出发,引出电商在品牌建设中的影响因素,并以此总结我国电子商务品牌建设的问题及对策,希望能给我国快速发展的电子商务提供一些建议。