任意歪斜钻孔中岩(矿)层真厚度计算解析

依据空间矢量代数理论,作者导出了任意歪斜钻孔中岩(矿)层真厚度的非常简便的计算式,这就可消除人们对这一公式的精确性和普遍性的怀疑。本文还证明了已有七种较烦琐的公式实质上完全一样,均可化为本文导出的简便公式。     

企业再造与核心竞争力的提升

中国加入WTO后,许多企业为了与国外大公司相抗衡,开始进行或准备实施业务流程再造,目的是提高整个流程的效率,更好地满足顾客的需要,在新的环境中获取新的竞争优势.论述了企业再造与核心竞争力之间的关系,以及如何通过企业再造提升企业核心竞争力.     

核心自我评价:一个验证性因素分析

国外的学者认为自尊、一般自我效能、心理控制源和情绪稳定性构成了一个更加广泛、更加基本的因素,即核心自我评价,同时发现该因素与工作满意度和工作绩效有较强的相关.本研究以大学生被试(n＝244)为样本,检验了核心自我评价构念对中国人的适用性.研究运用了二阶验证性因素分析,发现对于华人来说该二级结构仍然稳定地存在,自我评价水平高者相应的有较高的自尊水平和自我效能感,同时更多趋向于内控,情绪比较稳定;同时还发现,4种人格倾向在性别上没有表现出显著差异.     

界面滑移的钢管混凝土力学特性试验研究

界面光滑的钢管混凝土(CFT)与传统CFT加载方式的区别，是沿轴心受力界面滑移的CFT荷载直接加在核心混凝土上，钢管只对核心混凝土起到约束作用，而不承受任何纵向力．由于优化了加栽方式，使得界面滑移的CFT较传统结构的屈服延迟．分析及试验表明，在轴心受压时，CFT构件较传统构件有更显著的承载力，且界面滑移的CFT将会给约束混凝土带来新的理念和分析方法。     

AN ENORMOUS THRUST NAPPE AND EXTENSIONAL METAMORPHIC CORE COMPLEX NEWLY DISCOVERED IN SINO-MONGOLIAN BOUNDARY AREA

An enormous thrust nappe and a metamorphic core complex of extensional origin have been recently discovered within the Hercynian-Indosinian orogen of Inner Mongolia. Both features are of the Mesozoic age, but the former is older. The thrust nappe strikes WNW-ESE and Proterozoic dolomite was thrust southwards atop strata ranging from the Cambrian to the Triassic in age. The visible displacement of the thrust is ca. 70 km and the deduced one is over 140 km. The metamorphic core complex (mainly mylonites) extends in an N-E direction, forming itself into a dome geometry and lying under an extensional detachment fault. The mylonitic foliation dips gently and the stretching mineral lineation, as a whole, plunges SSE. Various shear sense markers show a normal-sense shear movement. Some significant problems atise from the coexistence of nappe and extensional structures at a postoro-genic stage.     

薄层色谱、凝胶色谱、薄层扫描分析核-壳型微交联聚苯乙烯微粒

本文用薄层色谱成功地将微交联核-壳结构聚苯乙烯微粒中的少量线性PS分子与微交联组分相分离,用凝胶色谱法测得线性PS的分子量为104-105数量级;0.2-1.6×10-6g的点样量,薄层扫描吸收峰面积与样品量成良好的线性关系;可直接由峰面积计算线性PS分子的含量;结合微粒的表观粘度,对微粒的核-壳结构进行了定性分析。     

Fe<Subscript>3</Subscript>O<Subscript>4</Subscript>/Au composite nano-particles and their optical properties

Fe₃O₄/Au composite particles with core/shell structure were prepared by reduction of Au³⁺ with hydroxylamine in the presence of an excess of Fe₃ O₄ as seeds. The resultant colloids, with an average diameter of less than 100 nm, were obtained; the remaining non-reacted Fe₃O₄ seeds can be removed by treatment with diluted HCl solution. The Fe₃O₄/Au colloids exhibit a characteristic peak of UV-visible spectra, which largely depend on the size of the particle and the suspension medium. The localized surface plasmon resonance peaks red shift and broaden with increased nanoparticle diameter or increased solvent ionic strength. The optical property is very important in the establishment of means for the detection of biomolecules.     

Emulsion polymerization of supermicron,monodisperse acrylic copolymer particles with core-shell structures

The emulsion polymerization of large MMA/BA copolymer particles with narrow particle size distributions and core-shell structure is described. A series of sequential seeded growth emulsion polymerizations were used to obtain monodisperse particles with diameters of at least 3 μm, at 30% solids contents. Because the core and shell polymers used here were chemically similar, core-shell structures could not be verified by differential staining tech-niques. Core-shell structure was demonstrated by minimum film-forming temperature studies and by scanning electron microscopy in conjunction with energy dispersive x-ray analysis, using chlorine-labeled core polymers. © 1995 John Wiley & Sons, Inc.     

LaH分子结构和基态势能曲线的量子化学计算

用常规的单参考态HF、B3LYP、MPn、QCISD(T)方法在能量一致相对论有效势近似下计算了LaH分子平衡结构和基态势能曲线,考察了这些方法在计算远离平衡的金属氢合键体系势能时存在的不趋于离解极限的缺陷,提出了从B3LYP的平衡位置附近势能曲线拟合得到适用于整个空间范围的Murrell-Sorbie解析势能函数的计算方法,由此计算的振转常数和已有的实验光谱数据完全吻合.