Modified Markov Chain Monte Carlo Method for Dynamic Data Integration Using Streamline Approach     

Yalchin Efendiev  Akhil Datta-Gupta  Xianlin Ma  Bani Mallick 《Mathematical Geosciences》2008,40(2):213-232

In this paper, the Markov Chain Monte Carlo (MCMC) approach is used for sampling of the permeability field conditioned on the dynamic data. The novelty of the approach consists of using an approximation of the dynamic data based on streamline computations. The simulations using the streamline approach allows us to obtain analytical approximations in the small neighborhood of the previously computed dynamic data. Using this approximation, we employ a two-stage MCMC approach. In the first stage, the approximation of the dynamic data is used to modify the instrumental proposal distribution. The obtained chain correctly samples from the posterior distribution; the modified Markov chain converges to a steady state corresponding to the posterior distribution. Moreover, this approximation increases the acceptance rate, and reduces the computational time required for MCMC sampling. Numerical results are presented.  相似文献   

靖远矿区采煤沉陷区复垦综合评价方法研究   总被引：1，自引：0，他引：1  

刘学成  韩书才 《中国煤炭地质》2008,(8):47-49

以靖远矿区为例,从土地复垦和恢复生态学的角度出发,建立了靖远矿区采煤沉陷区复垦综合评价系统,选择土壤条件（土层厚度、土壤质地、有机质含量、土壤水分）、地形改造条件（地面坡度、地表破坏程度、改造难易程度）、气候及水文条件（年降雨量、灌溉条件）作为分类及评价因子对复垦潜力进行评价。将采煤沉陷地分为四种潜力区,对每种潜力类型区的复垦开发利用方向进行了优化设计,从理论上和实践上对靖远矿区采煤沉陷地的复垦能力以及复垦过程中用地结构的优化作了探讨,以期对当地沉陷地的复垦提供一定的科学依据。  相似文献   

泰安台日本6.8级地震前体应变变化观测报告     

卢双苓  李峰  王强 《地壳构造与地壳应力文集》2008,(0)

2007年7月16日日本发生ML 6.8地震。此次地震前的7月6日,山东泰安台钻孔应变仪观测到异常变化。本文报告了变化情况,同时给出了水位和气压的变化。  相似文献   

DS600和MAX6612在温度传感器中的试验应用     

孙海霞  李海亮 《地壳构造与地壳应力文集》2008,(0)

DS600和MAX6612是MAX(美国美信公司)新出的两款模拟温度传感器产品。这两款芯片在性能上各有其优越性,本文主要就其特征、参数、结构、功能等分别进行了研究,并结合实践情况进行了试验和应用。  相似文献   

中强地震前后能量分布的自仿射特性     

蒋海昆  王忠民 《地震》1996,16(2):135-143

根据简化的地震波传播理论,“漫化”地震能量在空间的分配,减弱能量空间分布概率的极端情形及消除统计域为“空”的情形,由此构造类似于二维ｆＢｍ的地震能量空间分布概率曲面。与起伏不平的地形相似,由于基在水平方向及垂直方向的变化不是等比例的,因而这一分形曲面可能是统计自仿射的。  相似文献   

北京及邻区微震活动的初步分析     

赵永  高艳玲 《地震地磁观测与研究》1996,17(5):42-49

通过对北京遥测地震台网近年来记录到的北京及邻区地震的震中分布,地震活动频度及能量释放强度的分析,得到本区地震活动在时间分布上具有“聚堆性”。在年发震频度,地震强度和能释放方面均具有双峰值特征,并且具有较好的一致性和同步性,在空间分布上具有条带特征,且形成北东～南西和北西～南东的两条相互交汇的条带。又通过统计分析得到本区发震概率最大的时间段是每年的１０月前后,而地震主要发生在北西～南东带上。  相似文献   

Multi-cloud model (MCM) method and its applications to the study on asymmetric spectral profiles   总被引：1，自引：0，他引：1  

Xiao-Ma Gu  Jun Lin  Ke-Jun Li  Jing-Ping Dun 《Astrophysics and Space Science》1996,240(2):263-271

A method of multi-cloud model (MCM) is proposed in this paper in order to research asymmetric profiles of spectral line formed by solar discrete active objects aligned along the line-of-sight difection. Based on the MCM method, under the conditions of certain assumptions and approximations, the line-of-sight velocityV and three other physical parameter approximation values, (i.e. Doppler width _D , source functionS and optical depth at line center ₀) within different clouds may be derived simultaneously by fitting both profiles theoretical and observational. An application example of the method withm=3 shows that MCM method is suitable to measure the velocity fields of multi-object at the same time from their non-Gaussian profiles of complex. TheV and _D derived from the method are reliable,S and ₀ are approximation. An influence of the variations of initial values in the parameter on the solution is given as well.  相似文献   

Calorimetric study of the coesite-stishovite transformation and calculation of the phase boundary     

Jun Liu  Letitia Topor  Jianzhong Zhang  Alexandra Navrotsky  Robert C. Liebermann 《Physics and Chemistry of Minerals》1996,23(1):11-16

High temperature drop-solution calorimetry in molten 2 PbO · B₂O₃ at 1044 K for coesite and stishovite polymorphs of silica was carried out to determine the enthalpy of the coesite-stishovite transition. These experiments were performed on high-purity, single-phase samples of coesite and stishovite. Our new value for the enthalpy of the coesitestishovite transition (ΔH ₂₉₈ ⁰ ) is 29.85 ± 0.78 kJ/mol, which is about 35% lower than previously reported by Akaogi and Navrotsky (1984) and Holm et al. (1967), but which compares well with new measurements by Akaogi et al. (1994b). Using these new data, we have calculated the equilibrium phase boundary between coesite and stishovite and obtained a slope, dP/dT=0.0031 (2) GPa/K. This calculated slope is in good agreement with that determined [0.0026 (2) GPa/K] from the in-situ X-ray diffraction study of Zhang et al. (1996).  相似文献   

SOMATOM AR.C型CT机复位故障检修     

孙璐  童双立 《CT理论与应用研究》1996,5(1):30-32

本文介绍了由电源故障引起的不可逆转故障,并讨论了维修和故障的排除。  相似文献   

锦州湾泥沙来源、洄淤状况与建港条件分析     

符文侠  刘国贤 《沉积学报》1996,14(3):149-156

锦州湾泥沙主要来源于沿岸入海河流的输送,外海水体的携带与沿岸、岛屿蚀余物质的补给。每年进入湾内的泥沙总量约为３３—３５万吨,假如这些泥沙不再向湾外流出,在湾内作均匀分配沉积,则相当于在湾底铺上５ｍｍ厚的土。水准和水深重复测量表明,潮滩以稳定的弱堆积为主,水下浅滩基本处于稳定状态。该湾在非正常情况下产生骤淤的可能性不大。综合建港条件良好。  相似文献