一类p-Ginzburg-Landau型径向极小的零点分布和渐近性态

研究了一类与超导相关的p-Ginzburg-Landau 模型,其中p>2.给出了这一类泛函的径向极小元的零点分布,并证明这个极小元的W1,p局部收敛性.     

Joint insolation and ice sheet/CO2 forcing on northern China precipitation during Pliocene warmth

East Asian summer monsoon (EASM) precipitation affects the lives of billions of people and impacts the stability of fragile desert ecosystems in central Asia [1...     

Low spatial correlation at base station uniform linear antennas

1. INTRODUCTION The received signals at base station (BS) usually suffer from fading due to multipath propagation[1, 2]. The antenna arrays technology have been intensively employed for enhancing performance by mitigating multi-path fading and co-channel interference[3,4]. With the ever-increasing demand for personal comm.- unication, antenna miniaturization technology trends become more and more important[5]. Spatial correl- ation has always been greatly concerned. On the one hand, a co…     

略谈西藏大学自编教材的建设与管理

文章通过对西藏大学教材建设的实践经验分析,认为西藏大学自编教材应从工作机制、机构和管理模式上进行大胆改革创新,才能编写出具有鲜明特色和受学生欢迎的教材。     

冗余现象及其对英语教学的启示

冗余信息是指信息传递过程中比实际需要多的信息，它普遍存在于语言中。在语言交际中保持适度冗余是必要的。冗余主要表现为两种形式：信息复现和信息蕴涵。英语语言符号系统本身及语言符号使用过程中均存在大量冗余，前者主要体现在语音、词汇及语法层次上，后者主要体现为重复、宕词、应酬语、感情词语及违反会话“合作原则”。正确认识、把握冗余现象，可从听、说、读、写及测试等方面促进英语教学。     

项目教学在计算机网络专业的应用研究

项目教学对于职业技术学校的学生有很强的针对性,对培养学生素质、提高学生素质有着重要的意义。计算机网络专业是一个对操作性要求很高的专业,学生如果没有组网和管理网络的实际经验,那么也不是网络专业的合格毕业生。     

三对羟基三苯基膦的合成研究

以对溴苯酚为原料，经过三步反应合成三对羟基三苯基膦，反应产物分离方便，产率较高（６５％）。     

学科建设视野下的科技工作路径探讨——以地方本科院校为例

通过对地方本科院校在抓学科建设过程中存在的对学科建设的指导思想不明确、对学科建设的内涵理解模糊的分析,指出处于培育阶段的学科建设必须纳入科学发展观视野下来考察,正确认识学科建设与科研工作的关系,从真正意义上确立科技工作在高校整体发展的地位和作用。在此基础上对在学科建设视野中的地方本科院校科技工作路径作了不失为明晰的勾勒。     

Genomic and genic sequence variation in synthetic hexaploid wheat (AABBDD) as compared to their parental species

In order to understand the genomic changes during evolution of hexaploid wheat, two sets of synthetic hexaploid wheat from hybridization between maternal tetraploid wheat (AABB) and paternal diploid goat grass (DD) were used for DNA-AFLP and single strand conformation polymorphism (SSCP) analysis to determine the genomic and genic variation in the synthetic hexaploid wheat. Results indicated that more DNA sequences from paternal diploid species were eliminated in the synthetic hexaploid wheat than from maternal tetraploid wheat, suggesting that genome from parental species of lower ploidity tends to be eliminated preferentially. However, sequence variation detected by SSCP procedure was much lower than those detected by DNA-AFLP, which indicated that much less variation in the genic regions occurred in the synthetic hexaploid wheat, and sequence variations detected by DNA-AFLP could be derived mostly from non-coding regions and repetitive sequences. Our results also indicated that sequence variation in 4 genes can be detected in hybrid F1, which suggested that this type of sequence variation could be resulted from distant hybridization. It was interesting to note that 3 out of the 4 genes were mapped and clustered on the long arm of chromosome 2D, which indicated that variation in genic sequences in synthetic hexaploid wheat might not be a randomized process.     

Reduced function and disassembled microtubules of cultured cardiomyocytes in spaceflight

Lack of gravity during spaceflight has profound effects on cardiovascular system, but little is known about how the cardiomyocytes respond to microgravity. In the present study, the effects of spaceflight on the structure and function of cultured cardiomyocytes were reported. The primary cultures of neonatal rat cardiomyocytes were carried on Shenzhou-6 spacecraft and activated at 4 h in orbit. 8 samples were fixed respectively at 4, 48 and 96 h after launching for immunofluorescence of cytoskeleton, and 2 samples remained unfixed to analyze contractile and secretory functions of the cultures. Ground samples were treated in our laboratory in parallel. After 115 h spaceflight, video recordings displayed that the number of spontaneous beating sites in flown samples decreased significantly, and the cells in the beating aggregate contracted in fast frequency without synchrony. Radioimmunoassay of the medium showed that the atrial natriuretic peptide secreted from flown cells reduced by 59.6%. Confocal images demonstrated the time-dependant disassembly of mirotubules versus unchanged distribution and organization of microfilaments. In conclusion, above results indicate reduced function and disorganized cytoskeleton of cardiomyocytes in spaceflight, which might provide some cellular basis for further investigations to probe into the mechanisms underlying space cardiovascular dysfunction.