时序数据年变信息提取及地震预测指标评估方法研究     

刘琦  张晶 《大地测量与地球动力学》2023,43(1):95-99

针对时序数据中的破年变异常,基于S变换时频方法构建信息提取流程,在提取常规短周期破年变信号(ONA)的同时分析背景年变信号(ANA)的演化过程。在此基础上,基于双向非对称阈值策略,结合R值评分及Molchan图表法构建预测指标确定和效能定量评估方法。新疆库尔勒水平摆倾斜北南测项的实际应用结果显示,该测项的ANA信息对台站周边250 km内6级以上地震具有较好的预测效能,ONA信息对200 km范围内5级以上地震的预测效果相对更优。  相似文献   

非平衡非耗散热力学及非平衡相图计算          下载免费PDF全文

王季陶  张卫 《盐湖研究》2003,11(1):62-65

非平衡非耗散热力学是现代热力学中的一个全新领域。该领域的基本情况可参见王季陶的最新英文专著《Nonequilibrium Nondissipative Themodynamics》一书[Springer的网页：http://www.springer.de/egi-bin/search book.pl？isbn=3-540-42802-x]。文中对现代热力学完整的基本分类系统和非平衡相图的计算展开一定的讨论。  相似文献   

低速十字路口交通流模型相图          下载免费PDF全文

李启朗  孙晓燕  汪秉宏  刘慕仁 《海洋学报》2010,32(9):5996-6002

研究由两个单车道构成低速十字路口交通流模型.模型中两车道上的车辆更新遵循无交通灯管制下的并行规则.依据构建相图的原则并采用局部占有概率方法,建立相图,给出相图中的各部分区域的流量表达式.两车道均采用周期边界条件和确定性FI模型进行数值模拟,模拟结果与理论分析精确一致.模型中两条车道的行车规则更接近实际道路交通,该结果为交通管理提供一定的指导作用.  相似文献   

开放边界条件下平面环行交叉路口交通流的相图研究          下载免费PDF全文

白克钊  邝华  刘慕仁  孔令江 《海洋学报》2010,32(9):5990-5995

运用具有内、外环车道的平面环形交叉路口元胞自动机模型,对开放边界条件下平面环行交叉路口的交通流进行研究.计算机模拟结果表明:边界条件和道路瓶颈影响着平面环形交叉路口交通流的性质,产生概率和消失概率均只在一定范围内影响系统流量的变化.根据系统流量与产生概率和消失概率的关系,将系统分为三个相区,并对相图进行研究,为实际交通控制提供参考.  相似文献   

Schmidt plate survey in the galactic centre direction. 1. Investigation of open clusters in the Sagittarius-Carina spiral arm     

N. Kharchenko  E. Schilbach 《Astronomische Nachrichten》1995,316(2):91-104

A study of four open clusters on Tautenburg Schmidt plates in the direction to the Galactic Centre (l = 17.0°, b = +0.8°) is presented. In a field of 8.95 square degrees proper motions and B, V magnitudes were determined for about 36 500 stars up to the limiting magnitudes B = 17^m.9, V = 16^m.8. For stars brighter than B = 16^m an accuracy of about 3 mas/year has been estimated for proper motions. The rms errors of stellar magnitudes and (B—V) colours is about 0.1 mag. There are two open clusters already known in this sky area: Trumpler 32 (C 1814-133) and NGC 6611 (C 1816-138). By the inspection of the plates two additional anonymous clusters were identified near the double star ADS 11285 or BD −14°5014 (C 1819-146) and near the star BD −14°5016 (C 1820-146). The cluster membership determination was carried out using information on spatial and proper motion distributions of stars in the field. The colour-magnitude diagrams up to the limiting stellar magnitude were constructed. For each cluster interstellar extinction A_V, diameters of the core and corona, ages and spatial velocity components (V, W) relative to the LSR in the Y, Z-galactic directions were derived. The distances to the clusters were obtained to 1720 pc, 2260 pc, 2130 pc and 2130 pc for Trumpler 32, NGC 6611, C 1819-146 and C 1820-146, respectively. All clusters are situated in the Sagittarius-Carina spiral arm. Their spatial location confirms the assumption that galactic spiral arms are close to logarithmic spirals with a characteristic angle of about 20 degrees.  相似文献   

盐田兑卤法提高光卤石矿质量的方法探讨   总被引：1，自引：1，他引：0       下载免费PDF全文

李建国  王成玲 《盐湖研究》2007,15(3):33-36,47

通过相图分析及计算,介绍了一种"由盐湖卤水兑卤除氯化钠后,首先获得成矿卤水,然后对其蒸发制取质量较好光卤石矿"的生产方法。  相似文献