上皮生长因子预防心脏术后心包粘连的实验及临床研究

目的探讨上皮生长因子(EGF)对心脏术后心包粘连的预防作用.方法术中对犬心包内喷洒上皮生长因子3个月后,观察心包粘连情况;选先天性心脏病、房缺及室缺病人40例,术中心包内喷洒上皮生长因子,术后6个月、12个月经CT检查,判定心包粘连、增厚结果.结果在动物实验和临床研究中,实验组粘连程度显著低于对照组(P<0.01).结论 EGF心包内应用有明显预防心脏术后心包粘连的作用.     

剑桥空间百科全书——任务、应用和探测

自从1957年苏联第一颗人造卫星发射成功后，至今已有30多个国家发射了8000多颗人造卫星和火箭，花费了数亿美元。难以置信的是有超过350人曾遨游在大气层之上，并在数不胜数的空间应用中获益匪浅。     

An ERP study for the degrees of the difficulty in visual search

The present study mainly probed the relationships between ERP components and the degrees of difficulty in visual search. Three experimental and one controlled conditions were randomly selected. Results showed that the P1, N1, and P2 amplitudes and latencies had no significant differences among the three experimental and one controlled conditions, and the ERP waveforms of low perceptual load of visual search were different from that of high perceptual load. These results might indicate that the latencies and amplitudes of initial P1, N1 and P2 in high and low perceptual load conditions were almost the same. The ERP waveforms of parallel search were very different from that of serial search, and the ERP waveforms of serial search were very similar. The P3 amplitudes increased as the degrees of the difficulty in visual search decreased.     

中部地区教育投资效应实证分析

利用面板数据模型着重分析中部地区之间教育投资效应差异及其原因.得出结论:由于对教育的投资力度不同,导致了中部地区发展的不平衡.     

The Response of Debris-Flow Events to Solar Proton Flares （Ⅰ）

By analyzing the observation data from Dongchuan Debris Flow Observation and Research Station and historical data from year 1965 to 1990 gotten from National Astronomical Ob-servatories/Yunnan Observatory,the responding of debris flow in Jiangjia Ravine to Solar Proton Flare is studied. The following conclusion can be drawn. Solar Proton Flare,as one of most im-portant astronomical factors,affects the activity of debris flow in Yunnan. Generally,from 1965 to1990,the more active Solar Pro-ton Flare is,the greater the probability of high frequency and large runoff of debris flow is. On the contrary,the less active Solar Pro-ton Flare is,the greater the probability of low frequency,small runoff,and low sediment transport of debris flow is.     

一种信息审计系统中的多关键字匹配算法

针对审计系统中搜索大量审计数据的需要,设计了一种基于哈希表机制的多关键字匹配算法.该算法把关键字集合储存到哈希表中,并为关键字集合建立了两个过滤表和一个关键字长度类型表.在查找过程中,对未经过滤表验证的字符串不再进行匹配查找,同时,关键字长度类型表的使用减少了循环的次数.测试结果表明,该算法在速度和精度上都优于BM和mgrep算法.     

对优秀跳远运动员助跑准确性的研究

通过对全国第十届运动会37名男女跳远运动员比赛的调查和分析,研究表明：第一，运动员的前三轮试跳助跑准确性、稳定性较好，而在后三轮试跳助跑准确性、稳定性较差，极大地影响了他们正常水平的发挥．第二，心理因素对跳远助跑的准确性有较大的影响,建议在今后的训练中加强在特殊状态下助跑技术稳定性的训练．     

20世纪中国女性文学中女性意识的嬗变与发展

20世纪中国女性文学的女性意识经历了五四时期的觉醒期,30年代至70年代的消融期和80至90年代后的发展期。在女性意识的嬗变发展过程中,显示着女性意识由自觉走向自醒,由模糊困顿到明晰多样。从不同阶段女性意识的不同特点中,可以透视出20世纪女性文学在发展过程中所取得的成绩及面临的困惑。     

Heterostructure in ZnO Nano-Tetrapods

1 Introduction 　　Nanoscale science and technology have attracted greatattention since the novel properties become dominant for well-known materials as their sizes reduced to some critical dimension. These properties frequently originate in lattice distortions, structure transformations etc[1]. The variations of size and structure ofnanocrystals lead to the change of their electronic structures. Very recently, nanoscale materials with different electronic structures were utilized in fabricating nanoscale junctions[2]. 　　……     

会计政策选择风险防范探讨

文章在分析会计政策选择风险存在的必然性的同时，提出了防范风险的对策。