变值配置函数空间整体编码族的2维对称性     

郑智捷 《成都信息工程学院学报》2011,(6):579-589

研究0-1多元变量的逻辑函数及其整体配置函数空间变值编码表示特性。根据对称特性,系统地定义一批整体编码结构:邵雍-Leibniz码、广义码、文王码、伏羲码和共轭码。展示变值向量配置函数空间规模以及函数群集的状态空间组织结构。对各类编码系列的可区分数目,给出计算公式。2维变值展示框架展现在变值配置函数空间中不同编码族具有的内蕴对称特性。分层结构编码配置函数空间和2维展现描述体系,为基于东方逻辑传统的现代逻辑架构:变值逻辑体系,利用高维分析工具探讨0-1序列非线性超复杂逻辑变换开辟道路。  相似文献   

Thermal history of the Rio Muni (West Africa)–NE Brazil margins during continental breakup     

Jonathan P. Turner  Paul F. Green  Simon P. Holford  Stephen R. Lawrence 《Earth and Planetary Science Letters》2008,270(3-4):354-367

We document the thermal record of breakup of the conjugate Rio Muni (West Africa) and NE Brazil margins using apatite fission track analysis, vitrinite reflectance data and stratigraphic observations from both margins. These results permit determination of the timing of four cooling episodes, and the temperature of samples at the onset of each episode. All samples are interpreted to have experienced higher temperatures in the geological past due to i) elevated basal heatflow (palaeogeothermal gradient in Rio Muni-1 well decaying from 58 °C/km during the Mid Cretaceous to 21.5 °C/km in the Late Cenozoic) and ii) progressive exhumation from formerly greater burial depth. A well constrained history of changing palaeogeothermal gradient allows for much more precise quantification of the thickness of eroded section (exhumation) than if a constant heatflow is assumed. Cooling episodes identified from the palaeotemperature data at 110–95 Ma (both margins) and 85–70 Ma (Rio Muni only) coincide with major unconformities signifying, respectively, the cessation of rifting (breakup) and compressional shortening that affected the African continent following the establishment of post-rift sedimentation (drift). The interval between these separate unconformities is occupied by allochthonous rafts of shallow-water carbonates recording gravitational collapse of a marginal platform. The rift shoulder uplift that triggered this collapse was enhanced by local transpression associated with the obliquely divergent Ascension Fracture Zone, and thermal doming due to the coeval St Helena and Ascension Plumes. The data also reveal a c.45–35 Ma cooling episode, attributed to deep sea erosion at the onset of Eo-Oligocene ice growth, and a c.15–10 Ma episode interpreted as the record of Miocene exhumation of the West African continental margin related to continent-wide plume development. Integration of thermal history methods with traditional seismic- and stratigraphy-based observations yields a dynamic picture of kilometre-scale fluctuations in base level through the breakup and early drift phases of development of these margins. Major unconformities at ocean margins are likely to represent composite surfaces recording not only eustasy, but also regional plate margin-generated deformation, local ‘intra-basinal’ reorganization, and the amplifying effect of negative feedbacks between these processes.  相似文献   

A layered model of the upper crust in the Aigion region of Greece,inferred from arrival times of the 2001 earthquake sequence     

O.?NovotnyEmail author  J.?Jansky  V.?Plicka  H.?Lyon-Caen 《Studia Geophysica et Geodaetica》2008,52(1):123-131

The western part of the Gulf of Corinth attracts attention due to its seismically active fault system and considerable seismic hazard. Detailed studies of the seismic activity of the region have been carried out especially as part of the so-called Corinth Rift Laboratory (CRL) Project. For standard earthquake locations, the CRL uses the HYPO algorithm and a special structural model that is composed of homogeneous layers (Rigo et al., 1996). This model was derived from a passive seismic experiment in a broader area around the western part of the Gulf. A significant part of the seismic activity is concentrated close to the town of Aigion, which was damaged by a strong earthquake in 1995. A sequence of smaller earthquakes occurred to the south of this town in the year 2001. In the present paper, we have used this sequence to derive an improved structural model for the region in the vicinity of the town of Aigion. This new model is based on the minimization of travel-time residuals. In particular, we used arrival times from a subset of 88 events recorded by at least 5 stations of the southern part of the CRL network, had magnitudes of over 2.3, and were recorded at the nearest station (station code AIO). A variant of the method of conjugate gradients has been used for this purpose. In comparison with the model derived by Rigo et al. (1996), the new model is characterized by a higher ν_P/ν_S velocity ratio and by higher velocities to a depth of about 7 km. The new model was derived with the aim to get more accurate locations of future events in the vicinity of the town of Aigion.  相似文献   

基于粗细网格的有限元并行分析方法   总被引：2，自引：0，他引：2  

付朝江  张武 《岩土力学》2006,27(5):807-810

并行计算己成为求解大规模岩土工程问题的一种强大趋势。探讨了粗细网格与预处理共轭梯度法结合的并行有限元算法。从多重网格刚度矩阵推得有效的预处理子。该算法在工作站机群上实现。用地基处理时土体强夯的数值模拟分析进行了数值测试,对其并行性能进行了详细分析。计算结果表明：该算法具有良好的并行加速比和效率,是一种有效的并行算法。  相似文献   

内蒙古固阳县席麻塔一带共轭剪切带的地质特征及形成机制          下载免费PDF全文

高德臻  魏荣珠 《地球科学》2000,25(3):232-236

通过区调填图在内蒙古固阳县北山新太古代石英闪长岩和中元古代英云闪长岩中发现了韧性剪切带.通过野外调查、应变测量及显微构造、电子探针等方法研究表明, 该韧性剪切带为两组呈共轭组合型式产出, 形成机制与西伯利亚板块和华北板块相互挤压作用有关, 为在地球较深层次、在压扁环境下的简单剪切, 形成时代为中元古代末期, 变质相为绿片岩相.   相似文献   

中国及其西南邻区新生代NW向扭动构造体系的成生发展和形成机制   总被引：1，自引：1，他引：0  

丘元禧 《地质力学学报》2001,7(4):335-345

NW向扭动构造体系广泛发育于中国西部并向中国东部延伸,且呈多字型特征,但在中国东部规模等级较小,断续相循,成生活动时期很新(晚白垩世末至早第三纪以来),由NW向褶皱、NWW向压扭性走滑、NNW向扭压性走滑和NEE向张扭性走滑组成。偏共轭剪切形成之NWW向扭动构造向中西部延伸并复合叠加在西域系(古河西系)之上。它是印度板块与欧亚板块会聚在中国大陆板内碰撞效应的产物,与中国东部和中国西部已经厘定的其他构造体系有着完全不同的应力活动方式。   相似文献   

基于共轭梯度搜索的病态问题处理方法     

刘杰  张娟娟 《大地测量与地球动力学》2019,39(8):863-868

在最小二乘平差准则基础上,把病态平差问题转化为无约束的二次规划问题,并利用优化理论分析病态对平差解的影响。通过共轭梯度搜索算法在可行域中寻找最优步长因子,自动寻找最速下降方向,并给出迭代初值的设置方法。分析近似计算中病态问题与局部最优解的关系,讨论局部最优解的快速迭代方法,并通过实例验证算法的有效性,计算迭代的速度。由于整个过程没有对法方程系数矩阵进行求逆计算,该算法可用于处理大规模系数矩阵高病态的平差问题。  相似文献   

Born近似快速三维反演井地电法数据   总被引：7，自引：4，他引：3       下载免费PDF全文

王志刚  何展翔  魏文博 《地球物理学进展》2007,22(2):508-513

本篇研究了井中电偶极激发地面接收的井地电法的快速反演成像问题.我们采用了Born近似方法和重加权正则化共轭梯度法(RRCG)算法.数值计算的结果表明Born近似是一种有效的井地电法三维快速反演方法,同时也说明井地电法监测油水前驱和储层边界预测的观测数据可以用该方法进行快速三维反演成像.  相似文献   

Iterative seismic inversion   总被引：4，自引：0，他引：4  

Stephen J. Norton 《Geophysical Journal International》1988,94(3):457-468

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A 3-D finite-difference algorithm for DC resistivity modelling using conjugate gradient methods   总被引：2，自引：0，他引：2  

K. Spitzer 《Geophysical Journal International》1995,123(3):903-914

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