考古学所见四千年前鲁西南地形地貌及自然环境

鲁西南地区是中华民族重要的发祥地之一,远古时代,先民们就居住、繁衍、生息在这块古老的土地上.考古发现表明,四千年前鲁西南的地形地貌及自然环境是河湖交错,林木茂密,气候湿热,水网密布,非常适合人类生存.     

Studies of the naturally occurring biomethylation of selenium and the determination of the products

A systematic study of the biomethylation of selenium and the determination of the methylated species indicates preliminarily that selenium is susceptible to natural biomethylation under certain environmental conditions. Detectable levels of methylated selenium species, including dimethyl selenide [(CH₃)₂Se], dimethyl diselenide [(CH₃)₂Se₂] and dimethylselenone [(CH₃)₂SeO₂] have been detected by gas chromatography – graphite furnace atomic absorption spectrophotometry (GC – GF AA) from a variety of environmental samples. Findings of naturally methylated selenium species from both soil samples and related air samples suggest that there may exist a localized cycle of selenium between ground soil and the ambient air. Factors that influence the sensitivity and accuracy for the determination of alkyl selenide compounds by GC – GF AA have also been investigated. Flashlike injection mode and addition of about 10% of hydrogen gas to the argon carrier gas provide for highly sensitive detection. Reproducible determination can be obtained with a precision of about 6% and the detection limits are 0.3 ng Se m^?3.     

Three generations of inorganic phosphates in solvent and water-borne paints: A synergism case

This research work is intended to compare the anti-corrosive properties of three generations of inorganic phosphate pigments in solvent-based paints and in water-borne ones, both of the epoxy type. The anti-corrosive properties of phosphate pigments were assessed by means of electrochemical techniques (corrosion potential measurements, polarisation tests, etc.), employing a steel electrode dipped into pigments suspensions. The behaviour of these pigments in anti-corrosive paints, formulated with different binders, have been studied by accelerated (salt spray cabinet and humidity chamber) and electrochemical tests (corrosion potential and ionic resistance measurements).Accelerated and electrochemical tests allowed to differentiate the anti-corrosive performance of the three phosphates studied in this research. These test are also able to detect and characterise possible synergism between the water-borne resin and the pigments.     

浅谈城市屋顶绿化空间的拓展

从种植设计、施工、养护管理等3个方面分析了屋顶绿化工程的技术可行性,指出屋顶绿化的发展前景广阔,有利于人类发展,应得到支持与推广。     

浅谈太原市呼延水厂二期工程电气设计

从供电电源选择、变配电系统设计、变配电站设置、照明设计、防雷设计、电缆敷设设计等方面介绍了太原市呼延水厂二期工程电气设计的主要内容。     

日本精神溯源

日本精神直接来源于日本民族的生存环境、生存方式、精英集团和民族信仰.资源短缺的生存环境和面向大海的扩张性生存方式,是日本精神的物质基础和文化基础;社会精英集团--武士,是民族精神的最主要创造者、体现者和弘扬者;武士精神所体现的民族信仰,构成日本精神的核心和标志性精神.     

网络教学环境下大学英语多维动态教学管理模式初探

网络教学环境下的大学英语教学具有非同步性、复杂性、弱控性、缺乏对思维的深刻性的训练以及网络自身无法克服的缺陷等特点，因此探索多维动态教学管理模式势在必行。多维动态教学管理模式是在现代管理观念的指导下，强调教师和学生也参与决策，通过课堂行为契约和全面质量管理等措施把决策的焦点集中在教与学上，建立灵活的反应机制。     

德国职业教育环境的认识与启示

纵观德国职业教育的政治环境、制度环境、教育环境及其社会对职业资格高度认同的社会环境、文化环境、对外交流环境等,都有利于高素质高技能应用性职业技术人才的培养与成长,这种职业教育环境及其包蕴的思想理念与文化传统,对我国的职业教育环境建设提供许多有益的借鉴与启示。     

网络环境下图书馆的创新与发展

分析了图书馆在互联网社会中的独特作用，介绍了互联网环境下图书馆发展的途径，探讨了现阶段图书馆深化发展的对策。     

我国实施农业保护的必要性及战略对策

我国自古以农立国 ,十二多亿人口 ,九亿在农村 ,是我国的基本国情。我国农业基础薄弱 ,在经济转型期 ,农业面临自然风险和市场风险 ,在市场竞争中处于明显的不利地位。鉴于农业的基础地位和我国的基本国情 ,必须采取相应的对策 ,对农业实施支持和保护