致密薄互层缝高扩展影响因素试验研究

依据岩心观测以及岩石力学性质试验发现,陇东地区致密薄互层油藏具有岩性、力学性质变化频次高,变化范围尺度小的特点。结合现场压裂数据,推断薄互层油藏压裂后产能低的主要原因是：压裂过程中,由于弱胶结面的存在,水力裂缝在层间的多次错动,导致水力裂缝缝高扩展受到抑制;压裂结束后,由于地应力作用,层间错动面闭合,有效水力裂缝面积减小。针对该推断,制备薄互层物理模拟试样,进行压裂物理模拟试验。通过物理模拟试验结果发现：层间高弹性模量差异,对于水力裂缝垂向扩展的抑制作用并不明显。在破裂压力后,增加排量仅对增大水力裂缝的体积有促进作用,对水力裂缝穿入其他岩层的作用较小或是没有。     

特高压交流同塔双回输电线路损耗特性研究

在对特高压交流同塔双回输电线路损耗特性进行研究时,需计算输电线路损耗值,传统方法需通过实测方式获取输电线路损耗值,而受到压等级和导线方式的影响,当前还没有有效的实测方法,实现困难。为此,提出一种新的特高压交流同塔双回输电线路损耗特性研究方法。对某地区双回1000kv和双回500kv特高压交流同塔双回输电线路进行研究。采用π型等效电路对输电线路进行描述,依据电路分析结果对输电线路电阻损耗进行计算。依据不同天气下电晕损耗计算原则,在采集大量实验数据的基础上,提出一定范围内输电线路单位长度电晕损耗计算公式。研究不同天气环境、输送量、输送距离、负载率对输电线路损耗的影响。得出以下结论：4分裂导线单位长度电晕损耗低于8分裂导线;下雨情况下电晕损耗显著高于干燥情况下的电晕损耗;输电线路损耗率随输送量无显著变化,随输送距离的增加而增加,随负载的增加而增加,1000kv输电线路损耗率随复杂率的涨幅比500kv输电线路低,优势高。     

Genetic analysis of fertility restoring genes for AL-type male sterility in wheat

In order to screen molecular markers linked to fertility restoring genes and further improve the breeding efficiency of restorer lines, in this study, wheat varieties 18A, 18B and 99AR144-1 were used as experimental materials to establish F2 fertility-segregating population. Plant quantitative trait “major gene polygene mixed model” separation analysis method and SSR molecular markers were adopted for genetic analysis of four generations, including the parents P1, P2, and hybrids (Fl and F2 populations). The results show that AL-type fertility restoring gene is controlled by two pairs of additive-dominant-epistatic genes and additive-dominant polygene; two primers linked to fertility restoring genes were selected by SSR molecular markers, including Xgwm95 on chromosome 2A and Barc61 on chromosome 1B, with the linkage distance of 15.0 cM and 18.0 cM, respectively. Based on verification, these two markers are reliable for distinguishing AL-type wheat sterile lines and restorer lines.     

图书馆专家知识地图构建与应用

从专家知识地图构建的准备、研发、宣传和维护更新等四个方面探讨了图书馆专家知识地图构建的方法,并从实践角度分析了如何运用专家知识地图来进行参考咨询服务,以实现专家显性和隐性知识向读者显性和隐性知识的有效转化,同时提升图书馆知识服务的能力与效率.     

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.     

高校残障学生锻炼指导的研究

对高校残障学生体育锻炼、健康指导情况进行了调查、分析和评述,目的是增强残障大学生体质,提高心理健康水平,倡导体育人文关怀,促进和谐校园建设.     

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.     

一种基于OpenCV的摄像机标定方法

针对双目立体视觉系统研制过程中的摄像机标定步骤,分析了计算机视觉函数库OpenCV中的摄像机模型,其中的非线性畸变考虑到了切向畸变和径向畸变,采用Bouguet角点提取算法,实现了基于OpenCV的摄像机标定.该算法具有很高的标定精度和计算效率、良好的跨平台移植性,可以满足双目立体视觉系统的需要.     

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。     

三价砷存在条件下毒砂表面微结构对热氧化硫杆菌附着性的影响

Understanding bacterial adsorption and the evolution of biofilms on arsenopyrite with different surface structures is of great significance to clarifying the mechanism of microbe–mineral interfacial interactions and the production of acidic mine drainage impacting the environment. In this study, the attachment of Sulfobacillus thermosulfidooxidans cells and subsequent biofilm formation on arsenopyrite with different surface structures in the presence of dissolved As(Ⅲ) was studied. Arsenopyrite slices with a specific surface were obtained by electrochemical corrosion at 0.26 V. The scanning electronic microscopy-energy dispersion spectra analyses indicated that the arsenopyrite surface deficient in sulfur and iron obtained by electrochemical treatment was not favorable for the initial adsorption of bacteria, and the addition of As(Ⅲ) inhibited the adsorption of microbial cells. Epifluorescence microscopy showed that the number of cells attaching to the arsenopyrite surface increased with time; however, biofilm formation was delayed significantly when As(Ⅲ) was added.