宝浪油田侏罗系三工河组浅水辫状河三角洲沉积模式研究

焉耆盆地侏罗系三工河组广泛发育由辫状河进积到湖泊中形成的辫状河三角洲。这种三角洲特征显著不同于其它三角洲,其主体是辫状分流河道和水下分流河道。宝浪油田含油层段主体为辫状分流河道,以心滩发育为主要特征,是典型的浅水缓坡粗粒辫状河三角洲沉积。     

千米桥潜山构造特征及其在油气成藏中的作用

千米桥潜山是黄骅坳陷最典型的新生古储型油气藏，恢复潜山古构造是认识其油气藏特征的重点和难点之一，运用地质力学方法研究潜山内幕构造之后认为，该潜山的形成基础是古生界印支期宽缓复背斜，在燕山期挤压构造作用下形成由逆冲叠瓦扇和反冲断层构成的三角带内幕构造，抬升受侵蚀形成潜山主体，喜马拉雅的两次古旋拉张使潜山掀斜定型。晚第三纪以来发生整体热沉降，潜山两侧凹陷沙三段生成油气向潜山侧向运移成藏。     

纤维体积分数对K3D/MCPA复合材料力学性能的影响

本文研究了纤维体积分数对三维编织芳纶纤维增强铸性尼龙(简称K3D／MCPA)复合材料力学性能的影响。研究表明，K3D／MCPA复合材料有优异的抗冲击性能，冲击强度比三维编织芳纶纤维增强铸性尼龙(简称C3D／MCPA)和纯基体均有大幅度的提高，且随着纤维体积的提高而升高。K3D／MCPA复合材料剪切强度随纤维体积比的增大而增大，其纵向剪切强度低于纯基体和C3D／MCPA复合材料，但其横向剪切强度高于它们。K3D／MCPA复合材料弯曲强度与弯曲模量随纤维体积比的提高而提高，但与相同体积比的C3D／MCPA相比，K3D／MCPA的弯曲强度与弯曲模量均较低。     

Three‐dimensionally braided carbon fiber–epoxy composites,a new type of material for osteosynthesis devices. I. Mechanical properties and moisture absorption behavior

In recent years, three‐dimensionally (3D) braided composites have attracted a great deal of attention because of their high‐impact damage tolerance and fatigue life, superior fracture toughness, and so forth, and have been used in aeronautics, military, and transportation. These advantages make them strong candidates for osteosynthesis devices. In this study, 3D braided carbon fiber–epoxy (C_3D/EP) composites were produced via a simple vacuum impregnation technique. The load‐deflection curve, mechanical properties, and influence of fiber volume fraction, braiding angle, and axial reinforcing fibers were examined to determine their suitability for internal fixation devices. It is found that the C_3D/EP composites have excellent toughness and do not show brittleness when fractured because of their relatively high void content. The flexural, shear, and impact strengths of the C_3D/EP composites are excellent. It was shown that a C_3D/EP composite with a stiffness similar to load‐bearing bones can be made while maintaining enough strength. It is concluded that a relatively higher void content and braiding angle is more suitable for the C_3D/EP composites from the viewpoint of requirements of fracture fixation materials. The moisture absorption behavior and changes in mechanical properties caused by moisture uptake were evaluated. Results show that absorbed moisture slightly decreases mechanical properties of the C_3D/EP composites. Contrary to the unreinforced epoxy, the moisture absorption behavior of the C_3D/EP composites cannot be described with Fick's law of diffusion, probably because of the presence of voids and/or 3D fiber structure. The exact mechanisms should be proposed in further investigations. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 1031–1039, 2002     

论黄河三角洲流路演变及河口治理的指导原则

通过分析黄河三角洲流路演变中溯源堆积及溯源冲刷对典河下游河道影响的范围，幅度和作用历时，提出在黄河泥沙从根本上减少之前，河口治理的指导原则应是在有利于工农业发展和有利于防洪防凌前提下，有计划地安排河口流路。     

Consequences of the formation of Cooper-pairs near oxygen-deficient sites

In this investigation we consider the formation of Cooper pairs near the oxygen-deficient sites in Y-Ba-Cu-O ceramic superconductors which would give rise to an energy-dependent potential as seen by conduction charge carriers. It is shown that Cooper pairs could be formed under such conditions, resulting in a supercurrent. We use the Bogoliubov transformation technique to calculate the energy gap, the energy difference, and the transition temperature of the model superconductor using certain data obtained from previous experiments. Numerical analysis shows that the superconducting current can be explained by the presence of such oscillating Cooper pairs.     

分形及分维在单轴向三维编织复合材料拉伸实验中的应用

基于分形几何的计盒维数研究了三维编织复合材料拉伸实验的断裂样照,结果表明,该材料的断裂曲线具有统计自相似性,在不同的尺度范围内具有不同的空间分布格局;而计盒维数定量地表征了其尺度变化规律;准静态和低应变率加载条件下材料的分维数较大,表明其空间占据程度较大,曲线弯曲结构复杂,这是因为低应变率加载时材料内部结构断裂时间不同造成;而高应变率加载时,断裂曲线分维数较小,曲线空间占据小,弯曲结构比较简单,这是由高应变率加载时材料内部结构断裂时间差异缩小造成。     

动力有限元在三维编织复合材料弹道冲击性能研究中的应用

三维编织复合材料具有高的层间剪切强度,高的损伤容限和显著的抵抗裂纹扩展的能力。三维编织复合材料弹道性能的研究一般局限于实验观察阶段。本文运用数值计算方法对三维编织复合材料细观结构有限元模型进行弹道冲击性能研究,得出了合理的结果,说明了这种方法的有效性。     

Molecular modelling of Staphylococcal {delta}-toxin ion channels by restrained molecular dynamics

-Toxin is a 26-residue channel-forming peptide from Staphylococcusaureus which forms an amphipathic -helix in a membrane environment.Channel formation in planar bilayers suggests that an averageof six -toxin helices self-assemble to form transbilayer pores.Molecular models for channels formed by -toxin and by a syntheticanalogue have been generated using a simulated annealing protocolapplied via restrained molecular dynamics. These models areanalysed in terms of the predicted geometric and energetic propertiesof the transbilayer pores. Pore radius calculations of the modelsdemonstrate that rings of channel-lining residues contributea series of constrictions along the pore. Electrostatic propertiesof the pores are determined both by pore-lining charged sidechains and by the aligned helix dipoles of the parallel helixbundle. Molecular dynamics simulations (100 ps) of -toxin modelscontaining intra-pore water were performed. Analysis of theresultant dynamics trajectories further supports the proposalthat alternative conformations of pore-constricting side chainsmay be responsible for the observed conductance heterogeneityof -toxin ion channels.