基于高精度非球面测量的数据采集与处理系统研究

根据高精度非球面补偿加工的要求,提出一种高精度非球面测量及数据处理系统．系统基于工控PC机和Windows98操作系统,用Visual C 作为开发工具,完成了硬件设计、数据采集、数据处理和非球面测量误差的评价．通过实验得到测量系统的随机误差,验证了系统的可靠性．     

用二次曲面方法求解多机系统故障临界清除时间

为提高多机系统故障临界切除时间的求解精度和保证确定的误差方向,该文在主导不稳定平衡点处利用空间二次曲面来近似局部稳定域边界,根据持续故障轨线与空间二次曲面的交点来确定系统的故障临界清除时间.仿真结果表明,该方法具有固定的误差方向和较高的计算精度,误差基本能控制在10%以内,能够对系统的故障严重程度进行排序.另外,在网络中发生故障时计算性能可能没有切平面方法好,这方面的理论根据还需进一步的研究和探索.     

用分段回归方法计算孔隙结构的分形维数

储层岩石的孔隙空间具有良好的分形特征,孔隙结构的分形维数可以用来定量描述孔隙结构的复杂程度。应用分形几何的原理,推导了储层岩石不同孔隙分布和毛细管压力曲线的分形几何模型。根据毛管压力曲线资料,用分段回归的方法计算了不同孔隙结构的分形维数。计算结果表明,用分段回归方法计算孔隙结构的分形维数能更好地反映孔隙结构的实际情况。若孔隙大小相差不大,孔隙结构的分形维数相等或比较接近;若孔隙大小相差较大、非均质性较强,得到的孔隙结构分形维数不同。     

Characteristics of carbonate gas pool and multistage gas pool formation history of Hetianhe gas field, Tarim Basin, Northwest China

<正> Hetianhe is a big carbonate gas field which isfound and demonstrated in the period of "Chinese NationalNinth 5-Year Plan". The proved reserve of Hetianhe gas fieldis over 600 ×10⁸ m³. Its main producing layers are Carbon-iferous bioclastic limestone and Ordovician carbonate com-posed of buried hill. The former is stratified gas pool withwater around its side, and the latter is massive gas pool withwater in its bottom. The gases in the gas pools belong to drygases with normal temperature and pressure systems. Basedon the correlation of gas and source rock, the gases aremainly generated from Cambrian source rocks. According tothe researches on source rock and structure evolution, andthe observations on the thin section to reservoir bitumen andthe studies on homogenization temperature of fluid inclu-sions, the gas pool has been identified and divided into threeformation periods. The first is Late Caledonian when the oilgenerated from the Cambrian source rocks and migratedalong faults, as a form of liquid facies into Ordovician carbonate res-ervoir and accumulated there. After that, the crustuplifted, the oil reservoir had been destroyed. The second isLate Hercynian when condensate gases generated from theCambrian source rocks and migrated into Ordovician res-ervoir, as a form of liquid facies. Since the fractures hadreached P strata, so the trap might have a real poor preser-vation condition, and the large-scale gas pool formation hadnot happened. The third gas reservoir formation period oc-curred in Himalaya. The fractures on both sides of Hetianhegas field developed violently under the forces of compression,and thus the present fault horst formed. The dry gases gen-erated from Cambrian source rocks and migrated upwardsas the form of gas facies into Ordovician and Carboniferousreservoirs, and the large gas pool as discovered at presentwas formed finally.     

Sensitivity dependence of surface plasmon resonance based sensors on prism refractive index

We theoretically and experimentally demonstrate that refractive index of the prism used to load metal film has significant influence on sensitivity of surface plasmon resonance based sensors. The prism with lower refractive index gives the sensors a higher sensitivity in detecting refractive index variations of a sample. We attribute this effect to the fact that a prism with low refractive index will increase coupling distance between surface plasmons and the medium under investigation. Foundation item: Supported by Wuhan University and National Education Ministry of China Biography: Wang Guo-ping (1964-), male, Professor, research direction: bolographic materials, diffractive optical elements, optical properties of metallic nanopracticles and metal-dielectric nanostructures     

新疆若羌县赤石山变质核杂岩研究

新疆北山裂谷带西缘若羌县赤石山地区存在大型变质核杂岩构造。其下拆离盘为古元古界结晶基底杂岩 ,上拆离盘为中元古界白湖群变质岩系 ,滑脱拆离带为已变形的大型韧性正断层。核杂岩南、北侧发育上叠盆地 ,北侧形成“年轻”正断层及同构造期岩浆岩。变质核杂岩的形成与晚古生代北山陆内裂谷区域伸展有直接联系。该区变质核杂岩的首次厘定 ,对深化北山裂谷的研究具有重要意义     

高应力软岩巷道壁后充填支护研究

高应力软岩巷道属非线性大变形问题,巷道支护必须满足其变形要求。总结了白皎煤矿高应力软岩砌碹巷道变形破坏特征,分析了砌碹巷道破坏机理,并对碹体壁后充填粉煤灰基材料改善"支护-围岩"关系的作用机理进行了分析,最后得到了现场验证。     

明胶-十二烷基硫酸钠复配体系表面活性的研究

对明胶－十二烷基硫酸钠(SDS)复配体系,研究了SDS浓度、明胶浓度、明胶种类及分子量对其表面活性的影响。实验结果表明,随着SDS浓度的增加,体系的表面张力降低,并在其变化曲线中有一“平台”区域,同时体系的乳化力增大,其乳化力顺序为纯SDS溶液>水解皮明胶－SDS>水解骨明胶－SDS>骨明胶－SDS>皮明胶－SDS体系;各体系的起泡力及其稳定性亦随之增大。而明胶浓度的增加导致了各明胶－SDS体系表面张力的增大,且明胶浓度对大分子明胶体系的影响较之小分子明胶体系要大;明胶浓度的增加降低了体系的泡沫稳定性;但明胶浓度及其种类、分子量对体系的乳化力影响不大。     

基于体素的医学图像三维表面模型重建

三维表面模型重建是将CT和MRI等医疗影像设备获得的二维图像重建成三维立体表面显示图像的过程·重点研究了其重建算法的具体实现:在建模上采用了基于体素的三维物体体积重建;在显示上提出了基于Ray Casting的三维物体二维直接显示技术·所以,和传统采用三角面拟合的方法相比,具有图像重建过程无需生成中间数据,无需进行3D物体的边界检测等优点,同时该算法并行性好,易于采用硬件方法实现加速·     

岩石单轴与三轴CT尺度裂纹演化过程观测

结合使用专用三轴压力仪与CT扫描仪,对砂岩和粉砂岩分别进行压缩试验并获得了系列CT图像。发现单轴压缩和三轴压缩时岩石试件均经历压密、扩容、CT尺度裂纹萌生、扩展、扩张、贯通和岩石宏观破坏阶段。在压密阶段和扩容阶段,CT图像无明显变化。采用密度损伤增量定量描述细观裂纹演化的集合效应。在CT尺度裂纹演化阶段,从CT图像出发描述裂纹的空间位置、形态、运动方向分析CT尺度裂纹演化对于岩石变形和强度的影响。裂纹模式图可揭示CT裂纹演化的规律。CT裂纹演化的基本特点是扩展与扩张的交替性。三轴条件下CT裂纹与主应力夹角较大,裂纹面较平直,裂纹扩张困难,呈现剪切破坏特点。