西南联大"学生为本"的助学理念及实践

处于抗战厄难岁月中的西南联大,学校办学和师生学习生活都面临着难于想象的困难。联大学子绝大多数来自沦陷区,经济来源几乎断绝,这使得助学工作于西南联大本科办学至关重要。西南联大＂学生为本＂的助学理念有着广博的内容,它包括学校和社会的＂他助＂以及学生为应对贫困所采取的＂自助＂等,这一理念的具体实践在一定程度上促成了西南联大本科办学的成功。     

传统孝文化在20世纪被解构的原因

20世纪的中国所要建立并已经建立的是一种新型国家社会,这种社会要求建构一种新型人际关系.显然,居传统社会文化中心的孝在现代化叙事逻辑中成为被改造的对象.正是强大的国家现代化力量、现代知识精英和民间社会自身三方共谋解构了传统的孝文化.     

Functions of Periostin in dental tissues and its role in periodontal tissues’ regeneration

The goal of periodontal regenerative therapy is to predictably restore the tooth’s supporting periodontal tissues and form a new connective tissue attachment of periodontal ligament (PDL) fibers and new alveolar bone. Periostin is a matricellular protein so named for its expression primarily in the periosteum and PDL of adult mice. Its biological functions have been widely studied in areas such as cardiovascular physiology and oncology. Despite being initially identified in the dental tissues and bone, investigations of Periostin functions in PDL and alveolar-bone-related physiopathology are less abundant. Recently, several studies have suggested that Periostin may be an important regulator of periodontal tissue formation. By promoting collagen fibrillogenesis and the migration of fibroblasts and osteoblasts, Periostin might play a pivotal part in regeneration of the PDL and alveolar bone following periodontal surgery. The aim of this article is to provide an extensive review of the implications of Periostin in periodontal tissue biology and its potential use in periodontal tissue regeneration.     

关于一类矩阵的平方根公式

从性质C1/2C1/2=C出发,在不求过渡矩阵的前提下,利用Sherman-Morrison公式得到了非负定矩阵A=aaT+bbT的平方根表示,进而解决了一类特殊矩阵方程X2=A的求解问题.其中a,b是Rn中的n维非零列向量.     

试题库系统的设计

主要讨论运用Structs架构,数据库用SQLServer2005,其之间数据以XML传递。通过此方法,能很好的实现程序、试卷数据库和样式分离,同时,具有十分友善的界面。可以灵活的输出各种格式的试卷,利于学生们的学习,同时,方便教师的教学。     

Complete genome sequence of Salmonella enterica serovar Typhimurium LT2.

Salmonella enterica subspecies I, serovar Typhimurium (S. typhimurium), is a leading cause of human gastroenteritis, and is used as a mouse model of human typhoid fever. The incidence of non-typhoid salmonellosis is increasing worldwide, causing millions of infections and many deaths in the human population each year. Here we sequenced the 4,857-kilobase (kb) chromosome and 94-kb virulence plasmid of S. typhimurium strain LT2. The distribution of close homologues of S. typhimurium LT2 genes in eight related enterobacteria was determined using previously completed genomes of three related bacteria, sample sequencing of both S. enterica serovar Paratyphi A (S. paratyphi A) and Klebsiella pneumoniae, and hybridization of three unsequenced genomes to a microarray of S. typhimurium LT2 genes. Lateral transfer of genes is frequent, with 11% of the S. typhimurium LT2 genes missing from S. enterica serovar Typhi (S. typhi), and 29% missing from Escherichia coli K12. The 352 gene homologues of S. typhimurium LT2 confined to subspecies I of S. enterica-containing most mammalian and bird pathogens-are useful for studies of epidemiology, host specificity and pathogenesis. Most of these homologues were previously unknown, and 50 may be exported to the periplasm or outer membrane, rendering them accessible as therapeutic or vaccine targets.     

京沪高速铁路北京至沧州段桥梁工程施工与创新

针对京沪高速铁路北京至沧州段桥梁工程特点，重点介绍了代表性特殊结构桥梁的施工方法、区域性地面沉降地区桥梁工后沉降的控制措施，以及保证350 km/h无砟轨道高平顺性的施工技术创新措施。     

论数字控制系统中采样频率的选定

合理选择采样频率是设计实时数字控制系统遇到的实际问题。而采样频率的选定是实现高精度，良好指标和具备较强抗扰力控制的关键所在，根据实际经验讨论了选定采样频率的主要参量和方法。     

无名氏的小说与战时重庆文学界

抗战后期，无名氏的《北极风情画》和《塔里的女人》畅销一时，重庆文艺界针对其色情成分和灰色的人生观展开批评，同时论及其流派特征与创作动机。其中李长之、邵子南多侧重于艺术分析和思想评价，何其芳则上升为政治批判。这次批评活动，在中国现代文学史的书写上缺席已久。