中国足球队“352”阵型质疑

德国等国各足球俱乐部推出"352"阵型以来,战绩收到较好的效果,中国的一些俱乐部采用此阵型,也收到明显效果,如:大连、上海等 阿里·汉来中国任主教练后,坚持用此阵型,但受到一些专家包括国家足球队队员的质疑,作者在本文就此较全面地阐述了自己的观点     

分子热力学前沿基础理论研究中的新理论2:有机分子的半金属结构理论与有机纯质的ΔH_(f g)~0理论式

分析了国际科技界声誉卓著的Benson法及其在理论上的缺陷,根据分子热力学理论模型-有机分子的半金属结构理论提出计算△Hfg0的理论式,经用42类不同结构类型780种有机化合物实测值验算,平均误差1.47%,误差≤2%的占总数的97%以上,本法物理意义明确,精确度比Benson法高6.7倍,显著优于文献中各式。     

基于支持向量机的卤代甲烷△fH^θm模型的构建

应用G98W程序包中的AM1方法，43种卤代甲烷分子进行优化计算，所得量化参数作为支持向量机的输入向量与△fH^θm进行建模，并与反向传播人工神经网络相比较，用留一法交叉校验对实验值进行预测。结果表明，支持向量机所建模型预测值具有良好的泛化能力，可用于卤代甲烷其他理化性质的预测。     

Lithological architecture, geological processes and energy-field environments are major factors for the formation of hydrocarbon reservoirs

The formation of hydrocarbon reservoirs is controlled by three major factors: lithological architecture, geological processes and energy-field environments. Among the three major factors, lithological architecture provides the storing medium for hydrocarbon; geological processes include hydrocarbon generation, migration, accumulation, preservation and modification; and energy-field environments refer to the various geothermal and geodynamic forces that affect the lithological architecture and drive the geological processes. In this study, we take Kela-2 and Sulige gas reservoirs as two examples to study relationships among the three major factors, and explain how these factors influence the scale and quality of hydrocarbon reservoirs.     

Gas seepage on the sea floor of Okinawa Trough Miyako Section

A marine geophysical survey was carried out,on the R/V Science 1 of the Institute of Oceanography, Chinese Academy of Sciences (IOCAS), in 2000, at the Miyako Section of Okinawa Trough. Here we present seismic and acoustic evidence of a gas seep on the sea floor on the western part of the Okinawa Trough, near the lower slope of the East China Sea Slope and discuss the possibility of related formation of gas hydrate. A gas column reflection was observed in echo-sounder data above a section where the sea floor reflector was missing, on both the echo-sounder and the seismic data for line H14. The seismic data also show an acoustic curtain reflection and a turbidity reflection at this section.These anomalies are the evidence of the existence of a gas seep, which occupies .an area 2.2 km in diameter. Based on the acoustic curtain on line H14, we believe that the amount of gas contained in the sediments below the gas seep is larger than 1% by volume of sediment. Tectonically, the gas seep developed in a small basin controlled by basement uplift in the north, south and east. The thickness of the sediment layer can be greater than 3.5 km. A mud diapir structure was found in layer D beneath the gas seep. Over-pressure may occur due to the large sediment thickness and also the tectonic basement uplift in the north, south, and east. The mud diapir could be the preferential pathway for methane-rich fluids. The acoustic curtain may indicate that free gas related to the gas seep can be formed on the sea floor. We also note that the layer above the acoustic curtain on profile H14 may contain gas hydrate.     

浅析英语委婉的特征、构成及作用

本文主要分析了英语委婉语的种种特征,委婉语的构成方式,以及委婉语的主要作用.这有助我们在学习和跨文化交际中更好地掌握和运用它,以达到更好的交际效果.     

极小子群完全条件可换的有限群

设F是一个子群闭的局部群系，具有下列性质：极小非F-群可解，且它的F-上根是一个Sylow子群。如果群G的任意4阶循环子群在G中完全条件可换，且G的任意极小子群包含于G的F-超中心内，那么G是一个F-群。     

一个新的结构参数在无机化学中的应用

定义了新的原子参数Wt和分子结构参^mW,并与碱金属卤化物、水合离子的物理化学性质作相关性研究得到很高的相关系数．依据最小二乘法建立的回归方程在α=0.01下通过F检验，因此，分子结构参^mW能够用于预测化合物和离子的性质．     

芨芨草纤维形态的研究

对新疆石河子盐碱荒地上栽培的芨芨草茎秆的纤维进行了详细研究，通过扫描电镜制片观察，发现芨芨草茎秆表皮下有20～30层厚壁细胞连接成的纤维组织带，我们用显微镜测量法对其纤维进行了测量，结果如下：纤维的平均长度为1．11mm，平均宽度为9．4μm，长宽比为118，细胞壁平均厚度为2．73μm，纤维平均腔径为3．87μm，壁腔比为1．42，纤维长度多集中在0．81～1．20mm范围内。可见芨芨草纤维细而长，长宽比大，壁腔比小，若能加以开发利用，是一种优质的造纸原料。     

风沙过渡区土地利用变化及驱动力分析--以陕北神木县为例

以陕北黄土高原长城沿线的神木县作为研究区域，应用土地利用转换矩阵表，分析了近13年来土地利用结构互动变化和动态变化的空间特征．结果表明：神木县的土地利用有其明显的变化，耕地、水域和未利用土地在减少，其中耕地和未利用土地的减少最为明显；本区域其他土地都有所增加，且转变幅度最快是园地和建设用地；农用地内部各地类转换剧烈，农用地和建设用地之间的转换明显，但土地利用沙化现象仍然存在；土地利用变化在空间分布上的土地综合动态度呈东南向西北逐渐降低趋势．神木县的土地利用变化受到多种因素的综合作用，在自然因素的背景下，其环境政策是该县域土地利用变化的主要因素，而人口增长、农业结构的调整，也是土地利用变化重耍驱动因素．