山西铝土矿资源开发利用的建议

介绍了山西铝土矿资源特征,分析了山西铝土矿资源开发利用的现状,并针对存在的问题,提出了相关的建议.     

Numerical simulation on the evolution of sediment waves caused by turbidity currents

Interest in the forming mechanism of sediment waves increases recently because of its significance on submarine engineering, sedimentary dynamics and hydrocarbon reservoir prediction in deep water. In this paper, the time-averaged continuity equations and Reynolds-averaged Navier-Stokes equations are applied in the numerical simulation of fluid dynamics. The modeling results are used to illuminate the effects of topography on turbidity current and explore the origin of submarine sediment waves. The research results show that (1) deposition occurs firstly at the lower ramp due to the deceleration of fluid, increase of density, loss of flow capacity and longer duration of flow passage; (2) density increase at the upslope due to the local jam results in velocity decrease and pressure increase; (3) sediment waves begin to be formed and migrated toward upstream in an area far away from the source with in- crease of the turbidity events; (4) deposition becomes more slowly with decrease of grain sizes, but the shape and sequences of these deposits are controlled by topography, not grain size.     

蒺藜皂甙对大强度训练大鼠血清ALT、AST、CK、LDH、BUN及睾酮的影响

研究了蒺藜皂甙对大强度训练大鼠血清ALT、AST、CK、LDH、BUN、睾酮水平生化指标的影响。对雄性SD大鼠进行7周大强度跑台训练,采用递增强度跑台训练,建立大强度耐力运动模型。结果显示:力竭运动后,蒺藜皂甙组大鼠血清ALT、AST、CK、LDH活性明显低于空白对照组(p<0.05p<0.01);蒺藜皂甙组大鼠血清BUN含量较空白对照组有显著的降低(p<0.01);蒺藜皂甙组大鼠血清睾酮水平明显高于空白对照组(p<0.01)。表明:蒺藜皂甙能减轻大强度耐力运动对大鼠肝脏、心肌、骨骼肌等组织细胞的损伤;蒺藜皂甙能提高大鼠睾酮水平,降低运动大鼠体内蛋白质分解,从而延缓大鼠运动性疲劳的产生。     

彩色多普勒超声心动图对缺血性心肌病与扩张型心肌病的鉴别诊断

为了研究彩色多普勒超声心动图对缺血性心肌病与扩张型心肌病的鉴别诊断价值.对经临床确诊的扩张型心肌病(DCM)85例,缺血性心肌病(ICM)130例的彩色多普勒超声心动图(CDUCG)资料进行对比分析.结果表明:1)两组都有左房室内径增大.DCM组心脏多个房室腔扩大呈球形结构,室壁变薄及弥漫性运动减低,ICM组室壁运动减低多为节段性,常伴有室间隔及左室后壁增厚.2)DCM组左室流出道增宽的病人较ICM组明显多.3)DCM组多瓣膜返流发病率高且程度较重,ICM组多为单瓣膜返流且程度较轻.4)DCM组收缩功能降低明显,舒张功能可正常,二尖瓣E/A＞1,ICM组大多数表现为左室舒张功能障碍.可见上述超声心动图特征对ICM和DCM的鉴别诊断有重要价值.     

The numerical method of inversion for the interior Radon transform

The interior Radon transform arises from a limited data problem in computerized tomography. The corresponding operator R is investigated as a mapping between wightedL ₂-spaces. Our result is the explicit construction of a singular value decomposition for R. This immediately leads to an inversion formula by series expansion and range characterizations. Foundation item: Supported by the Foundation of the Ministry of Education of China and the Science Foundation of Wuhan University Biography: WANG Jin-ping (1963-), male, Ph.D candidate, Research interests are in numerical solution of singular integral equation and integral transformation.     

Two Sorts of Fiber Optic Sensor Monitoring the Cure Process of Composite Laminate

Two new sorts of fiber optic sensor are designed.Firstly, the variation of refractive index of resin surrounding the embedded fiber optic was mean to observed by measuring the speckle spatial spectrum at the end-face of the fiber optic.Secondly, it is proposed to measuring the change of thickness of the laminate by using fiber optic microbend attenuation.The experiment results measured by the fiber optic sensors are given.The first sort of sensor was found to be able to detect the viscosity process of the resin matrix during cure process includeing the minimum point of viscosity, the gelation point and the end point of cure process; the second sort of sensor could detect the course of change of the thickness of composite laminate pressed by operation pressure.It is benefit for us to optimize the operation technology and to establish the intelligent monitoring system about curing process of composites for the reason that the viscosity process and the change course of the thickness of laminate can be monitored.     

电子政务信息公开的负效应分析——以山西省煤炭业矿难信息公开为例

信息公开是电子政务研究的重要内容。我国政府多次表示，要按照“公开是原则，不公开是例外”的要求，坚持严格依法、全面真实、及时便民的原则，对各类行政管理和公共服务事项。除涉及国家机密和依法受到保护的商业秘密、个人隐私之外，都进行如实公开。     

基于螺旋理论的机构弹性的几何分解

介绍一种对模拟机器人弹性的６×６刚度和柔顺矩阵进行对角化的几何分解方法．采用螺旋理论，从三个正交的外载螺旋柔顺轴和三个正交的变形螺旋柔顺轴推导得一个相似变换，对角元素是线性及旋转柔顺和刚度的静态值．这与应力、应变及转动惯量的主轴和主值类似，证明了对非奇异及奇异情况，分解总是存在的，并给出了分解表达式．     

晶体管发射结软击穿对多谐振荡器的影响

本文通过对多谐振荡器软击穿(即瞬时击穿)现象的观察与分析,提出并由实验予以证明在晶体管的基极接一保护二极管,能有效地稳定振荡频率和延长管子的寿命。     

铜矿石堆浸液中Cu(Ⅰ)的测定方法

研究测定铜矿石堆浸液中Cu（Ⅰ）的新方法．该法用沉淀络合剂从混合液中将Cu（Ⅰ）沉淀分离出来，用KIO3滴定，具有简便、快速、准确、可靠等特点，应用于实际样品的测定中，其结果与络量法一致．