高压天然气管道弯管盲板力的分析

分析高压天然气管道弯管处盲板力的产生及大小,得出高压天然气输送管道弯管处的盲板力只与高压天然气的动压有关,与静压无关的结论。并对弯管支墩的设置提出见解。     

对英语同义关系教学问题的思考

在英语教学中,同义关系是一个常见而复杂的语言现象。除了基本概念外,同义词还表现出相对性和非固定性以及在语境作用下的灵活性等特征。教师在重视同义词辨析的同时,应从语境的、较为广义的观点来把握单词、短语以至从句之间的同义关系,这对于提高学生阅读课文、掌握作者思路是有帮助的。     

多脉冲PPK的编码调制基本分析

分析了多脉冲ＰＰＫ编码调制方式的基本性能,给出了脉冲ＰＰＫ调制器调制的传信率计算式,指出了它的信号空间与冗余性的特点,证明了多脉冲ＰＰＫ不但优于单脉冲ＰＰＫ,而且在适当信号设计的条件下,在传信率上甚至优于二进制ＯＯＫ。     

广西三个文化板块共性和个性探索

文化是一个国家软实力的重要标志之一,繁荣社会主义文化是党和国家构建社会主义核心价值体系的重要举措之一。从中华文化板块的结构论起,以丰富的史学资料为证,阐释了广西三个文化板块的共性和个性,为更好地挖掘和传播广西文化提供理论依据,进而为广西经济社会发展服务。     

闪亮的奖牌

奖牌样式是体育赛事最闪亮、最精彩、最易得到关注的部分之一。第十二届全运会奖牌征集从2011年11月开始,组委会要求奖牌的设计要本着传统、个性、节俭、艺术、新颖、统一的原则,坚持五突出,即突出民族传统,突出辽宁元素,突出鲜明个性,突出勤俭节约,突出统一风格。     

论国有银行贷款风险防御和规避机制的重新构造

针对当前贷款风险的现实情况,国有银行应该树立正确的现代的贷款风险观。建立起以安全性为核心的内部贷款风险约束机制;同时,国有银行应该为自身创造一个宽松的外部环境,加快商业化改革进程。     

Species richness,phylogenetic and functional structure of bird communities in Chinese university campuses are associated with divergent variables

University campus is an important component of urban landscapes for biodiversity conservation. However, to our knowledge no study has quantitatively assessed the diversity and structure of bird communities in Chinese university campuses, especially from phylogenetic and functional perspectives. Here, for the first time we linked species richness, phylogenetic structure and body mass structure of campus bird communities with contemporary climate, glacial-interglacial climate change, altitudinal range, population density around campus, area and age of campus to test their associations. We found 393 bird species in 38 university campuses (29% of all Chinese bird species, two species are endangered, four species are vulnerable, and 33 species are near threatened). The variables significantly correlated with campus bird species richness, phylogenetic structure and body mass structure were altitudinal range and mean annual precipitation, glacial-interglacial anomaly in temperature, and altitudinal range, respectively. In particular, there were more species in steeper and wetter campuses, more young species clustered in campuses with stable glacial-interglacial climate, and more species with smaller body size in steeper campuses. Our study highlights the importance of considering both phylogenetic and functional information for biodiversity conservation in urban ecosystems.     

Aerodynamic roughness variation with vegetation: analysis in a suburban neighbourhood and a city park

Urban Ecosystems - Local aerodynamic roughness parameters (zero-plane displacement, z d , and aerodynamic roughness length, z 0 ) are determined for an urban park and a suburban neighbourhood with...     

准公共产品价格改革:城镇居民消费力的助推器

通过分析近十年城镇居民的消费性支出及收入情况发现,准公共产品支出渐渐成为居民生活的主要负担,加剧贫富差距的扩大,制约着城镇居民消费力的提升。     

论典型示范在大学生思想政治教育中的作用

强化榜样的典型示范作用,在大学生思想政治教育中有着非常重要的历史地位。发挥大学生中优秀典型的榜样示范功能,用他们的鲜活事迹去感染、去熏陶身边的大学生,一直以来是大学生思想政治教育中惯用的方式之一,但如何结合时代发展的特点,把这一教育方式融入时代元素,创新形式和载体,让它发挥更大的效能,更好地为大学生的思想政治教育服务,是本文的一点尝试。