新形势下大学生民族精神教育探析

当代大学生群体的民族精神教育是一个广为关注的话题,近年来,学界也围绕这个问题展开了广泛地讨论。本文在吸收借鉴学界研究成果的基础上,拟围绕大学生民族精神教育的必要性,当前面临的机遇和挑战,对大学生进行民族精神教育的内容导向和方式方法等三个方面做初步探究。     

传统护坡与生态护坡比较与分析

传统的护坡工程一般以水泥、石料、混凝土等硬性材料为主要建材,在设计上以力学的角度去思考边坡稳定,通常都以安全、经济为优先,忽略了生态修复,使边坡的生态功能恢复更加困难.生态防护技术的诞生顺应了人与自然共生的要求,提升了护坡工程建设的内涵.通过分析传统护坡和生态护坡的特点,对两种护坡形式进行了归纳分类,指出了它们的区别与联系,最后提出了传统护坡向生态护坡转变的主要途径.     

西方管理理论与中国传统文化的冲突

西方管理理论是在西方文化的基础上产生和发展起来的。中西方文化的差异和冲突，必然导致西方管理理论与中国文化的冲突，从而导致管理失效。要解决这个问题，必须认识文化冲突，化解文化冲突，进行文化融合和文化构建。     

Phylogenetic relationships of native and introduced Bemisia tabaci (Homoptera:Aleyrodidae) from China and India based on mtCOI DNA sequencing and host plant comparisons

Phylogenetic relationships for Bemisia tabaci were reconstructed by analysis of a ～780 bp fragment of the mitochondrial cytochrome oxidase I (mtCOI) gene with an emphasis on geographic range and distribution among eight eudicot plant families that are common hosts of B. tabaci worldwide to elucidate key phylogeographic linkages between populations extant in China (n=31) and India (n=34). Bootstrap values for the Maximum Parsimony tree were highly robust for all major nodes involving the major Asian clade, subgroups, and sister groups within, at 92%—100%. Between-clade distances for the Southeast Asia and three other major clades, e.g. from sub-Sahara Africa, North Africa-Mediterranean, and the Americas, were approximately >16% divergent. Two major Asian subgroups (I, II) were resolved, which represented populations indigenous to the region, comprising two (I a, I b) and five (II a—e) sister groups, respectively, which diverged by 11%. Two distinct populations from sunflower in Hyderabad grouped separately within the two Asian subgroups. All other populations grouped uniquely within Asian subgroup II or I. The "B" biotype was identified in 23 collections from China at 97.3%—99.5% nucleotide identity with "B" biotype reference sequences; it was not identified in collections from India. The majority of haplotypes were associated with 3—4 plant families, with one exception that for sister group IId (sesame, India), it might be monophagous. Thus, B. tabaci from the southeastern and near eastern regions of the Asian continent comprise of a large number of ancestral, richly divergent, mostly polyphagous populations. This region is therefore hypothesized to constitute an important Old World center of diversification for the B. tabaci complex, together with sub-Saharan Africa.     

人类干细胞研究中的若干伦理问题

由于人类干细胞研究关系到克隆技术能否正确运用,关系到对人类胚胎的正确对待等问题,围绕其目的、范围以及应具备的条件,一场伦理道德之争正在展开.这场争论的广度与深度前所未见,备受各国政府和全社会的关注,政府首脑、科学家、哲学家、医学家和伦理学家都纷纷发表各自的意见.现就人类干细胞研究的目的、范围及条件等有关伦理方面的10个问题,表明笔者的看法.     

铁基二氧化铅电极电解法制臭氧研究

以自制铁基二氧化铅电极作阳极,以石墨电极作阴极,探讨在不同电流强度和不同电解液条件下进行电解产生臭氧的最佳条件.     

环形狭缝过热气传热试验研究

对以去离子水为工质的过热气流过电加热的环形狭缝进行了换热试验，试验结果表明：环形狭缝中的过热气热交换参数与普通圆管有着显著的不同，随着狭缝间隙的减小，狭缝中的换热得到了增强，当内，外管热流密度相等时，内管换热系数大于外管换热系数，并且此时环形狭缝的换热能力最强，应用试验结果和多元线性回归方程，拟合出适合试验数据的经验关系式。     

火焰原子吸收法测定蒜渣中的微量元素

用硝酸－高氯酸（4：1）混酸对烘干后的蒜渣进行消化处理，用原子吸收光谱法测定处理溶液中的Ca、Fe、Mg、Zn、Cu、Co、Mn、Ni、Pb、Cd等10种微量元素，结果表明，蒜渣中对人体有益的元素如Ca、Fe、Mg、Zn含量丰富，具有很大的使用价值。     

氢化物原-子-荧光光谱法测定食品中微量砷

采用氢化物原子荧光光谱法研究了用砷化钾－硫脲作为预还原剂对测定砷的影响，讨论和确定了最佳检测条件，结果表明：该方法线性范围广，线性关系良好，r=0.9998,检出限为0.219μg/L，标准偏差为0.63%-0.85%，回收率为94．22－100.60%，该方法准确，简便，可广泛用于食品中砷的检测。     

三阶自治系统混沌存在的一个解析判据

根据混沌吸引子细胞模型理论，提出一个混吨解析判据，该判据可用于具有缓变振幅的动力系统，同时以Genesio系统为例说明了这个判据的运用方法。