用矩阵判断哈密顿图的一个充要条件

给出了一个从图的邻接矩阵来判断有限无向连通图是否是哈密顿图的充分必要条件     

86例HIV阳性肺TB临床X线征象分析

总结ＨＩＶ并肺ＴＢ的临床及胸部Ｘ线表现特点。方法：分析了８６例ＨＩＶ阳性病人肺ＴＢ的临床及胸部Ｘ线表现，男４５例、女４１例，年龄１７～５８岁。结果：咳嗽、胸痛、发热、消瘦、皮疹等为常见症状，但无特异性。Ｘ线表现：病变多位于中下肺野，单侧浸润稍多于双侧，多为浸润型肺ＴＢ（７０例），可合并心包炎、气胸。肺空洞少见。结论：ＨＩＶ阳性合并肺ＴＢ，临床表现无特征性；Ｘ线表现：结核浸润可发生于任何肺段，多见于中下肺野，空洞形成较少，有别于单纯性肺ＴＢ。     

液相色谱智能化——多段梯度洗脱满意分离条件之启发式自动搜索

本文为高性能液相色谱作定量分析,提供一种新颍方法,自动求得峰形分离良好的色谱图,并由此对于仪表之智能化前景作一展望。利用多段梯度洗脱法来改进分离,会引起搜索该条件之复杂化。为此,启发微机来搜索满意的分离条件,而不去搜索最优分离条件,较为合理而且方便。用本法分析人体血液中21种主要氨基酸组分,获得成功。     

1,10—邻二氮菲—铁（Ⅱ）—苦味酸盐三元配合物萃取分光光度法 …

采用三元络合物萃取分光光度法测定了钛氧化物中１０（μｇ．ｇ＾－１）数量级的Ｆｅ。为了取得好的分析精度密度，详细介绍了各种注意事项。     

Poisson groupoid的余迷向双截面

Poisson groupoid是Weinstein在研究Poisson Lie群和辛groupoid时提出的一个新概念，本文对Poisson groupoid中较重要的余迷向双截面做了一定的讨论，并且得到了一些有用结论。     

Nicotinic Acetylcholine Receptor α4 Subunit Gene Variation Associated with Attention Deficit Hyperactivity Disorder

Previous pharmacological, human genetics, and animal models have implicated the nicotinic acetylcholine receptor α4 subunit (CHRNA4) gene in the pathogenesis of attention deficit/hyperactivity disorder (ADHD). The objective of this study is to examine the genetic association between single nucleotide polymorphisms in the CHRNA4 gene (rs2273502, rs1044396, rs1044397, and rs3827020 loci) and ADHD. Both case-control and family-based designs are used. Children aged 6 to 16 years were interviewed and assessed wi...     

浅谈大学英语教学中的词汇教学

本文旨在探讨英语教学中教师如何从词汇教学入手,培养学生对英语学习的兴趣,从而激发他们内在的学习动机,进而提高教师的教学成果和学生的英语学习成绩.     

有机化合物结构与生物降解性的定量关系研究

采用量子化学MOPAC -AM 1法计算了 2 3种有机物的生成热ΔHf、分子最高占有轨道能EHOMO、分子最低空轨道能ELUMO、分子总表面积STSA及偶极矩 μ .结合辛醇 -水分配系数logKOW对生物降解速率常数lnK进行了定量结构 -生物降解性关系 (QSBR)分析 .对 1 1种取代苯和 1 2种脂肪族化合物分别做出如下多元回归方程 :-lnK =1 .82 + 0 .0 1 53STSA+ 1 2 4× 1 0 - 3ΔHf+ 0 .0 981 μ ,n =1 1 ,R2 =0 .73 9,s=0 .1 45,F =6.62 ,p =0 .0 1 9;-lnK =3 .0 6+ 0 .0 2 64STSA+ 3 0 8× 1 0 - 3ΔHf-0 .1 1 9μ ,n =1 2 ,R2 =0 .867,s=0 .2 1 2 ,F =1 7.3 8,p =0 .0 0 1 .应用所得QSBR模式预测了 2 3种有机物的生物降解性 ,方程对大多数化合物拟和很好 .结果表明 ,所研究有机物的生物降解性主要与分子大小、稳定性及分子极性有关 ,化合物与酶的活性点结合或反应是影响微生物降解的主要因素 .     

自动导引车系统关键技术的研究

提出了一种改进型电磁导引技术方案，该方案使自动导引系统的核心部分－路径规划算法及程序得以实现，分析及实验结果证明，该项技术是可行的，并且具有极高的经济性。     

Bathynotus: A key trilobite taxon for global stratigraphic boundary correlation between Cambrian Series 2 and Cambrian Series 3

The Cambrian trilobite Bathynotus is a special morphology of Redlichiid,which is characterized by a wider thorax axis and an 11th macropleural segment bearing a long,backwardly directed spine.Additionally,its 12th and 13th pleural segments are narrow and they terminate at a fulcrum where they fuse together and to the posterior edge of the long macropleural spine.The genus is widely distributed,occurring in North America,Siberia,the Altay-Sayan fold belt of Russia,South China,the Tarim Basin of China,and Australia.It occurs primarily in deposits of the upper part of the continental slope,at the transition between stable platform settings and subsiding margins of the late Early Cambrian.Here,we recognize three species of Bathynotus from China,including B.holopygus which is widespread around the world.Although six species of Bathynotus have been reported from Siberia and the Altay-Sayan fold belt area of Russia,data presented here suggest that only three of these species are valid.Bathynotus exhibits a short geological range,with its first occurrence late in the unnamed Cambrian Series 2 and the last appearance datum of Bathynotus at the boundary of Cambrian Series 2 and Cambrian Series 3.The late appearance datum (LAD) of Bathynotus provides an important global stratigraphic marker of the boundary between Cambrian Series 2 and Cambrian Series 3.