排序方式: 共有36条查询结果,搜索用时 15 毫秒
31.
32.
33.
采用MSDP地震分析软件提供的Loc3D和HYPOSAT两种定位方法对芦山科考的8次人工爆破事件进行绝对定位,将定位结果与已知爆破参数进行对比分析。结果显示:两种方法和两种速度模型都能较为准确地测定爆破事件的震中位置,震中定位精度均可优于2.5 km;根据爆破点位置、炸药当量估算震级和定位震级的对比,可验证四川盆地属于介质低衰减区,川西高原属于介质高衰减区,两个区域地震震级平均偏差为0.3;震源深度误差受最近台站震中距的影响比较大,当最近台站震中距小于10 km时,两种定位方法反演的震源深度误差均可优于3 km。 相似文献
34.
Lunan stone forest is a kind of typical karst in China, which is mainly developed underred soil. In the winter of 1999, three study sites were chosen in stone forest national park accordingto vegetation cover, geomorphologic location and soil types. CO2 concentration was measured withGastec pump at different depths of soil (20, 40, 60 cm) and at the same time soil samples weregathered and soil properties such as soil moisture, pH, soil organic content were analyzed and thetotal number of viable microbes were counted in laboratory. In the study, dependent variable waschosen as the mean soil log (PCO2), and soil properties were chosen as the independent variables.Multiple stepwise regression analysis showed that the total amount of microbes and soil moisture arethe best indicators of the CO2 production, with the equation LOG(PCO2) = - 0.039(TNM) - 0.056(Mo) + 1.215 accounting for 86% of the variation of the soil CO2 concentration, where TNM is thetotal number of microbes in the soil and Mo is the moisture of soil sample. 相似文献
35.
36.
为了满足现代多制式移动通信频段的需求,设计一种可覆盖大部分移动通信频段的超宽带天线。同时为了抑制与其他通信设备的干扰,在天线馈线旁加载两个U型谐振环用来获得双阻带特性。天线总尺寸为200mm×150 mm×3 mm。通过调整U型环可以获得不同的阻带特性。设计结果表明:天线工作在750~1150MHz和1650~2450MHz。该天线成本低、易集成,同时具有全向辐射特性,适用于现代移动通信需要。 相似文献