An Improved Data-Driven Multiple Criteria Decision-Making Procedure for Spatial Modeling of Mineral Prospectivity: Adaption of Prediction–Area Plot and Logistic Functions     

Ghezelbash  Reza  Maghsoudi  Abbas  Carranza  Emmanuel John M. 《Natural Resources Research》2019,28(4):1299-1316

Natural Resources Research - Assigning realistic weights to targeting criteria in order to synthesize various geo-spatial datasets is one of the most important challenging tasks for mineral...  相似文献   

Non-structural flood risk mitigation under developing country conditions: an analysis on the determinants of willingness to pay for flood insurance in rural Pakistan     

Azhar Abbas  T. S. Amjath-Babu  Harald Kächele  Klaus Müller 《Natural Hazards》2015,75(3):2119-2135

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Modeling the exceptional south Foehn event (Garmij) over the Alborz Mountains during the extreme forest fire of December 2005     

Abbas Mofidi  Iman Soltanzadeh  Yadollah Yousefi  Azar Zarrin  Mohsen Soltani  Jafar Masoompour Samakosh  Ghasem Azizi  Samuel T. K. Miller 《Natural Hazards》2015,75(3):2489-2518

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Facies Analysis, Sequence Stratigraphy and Diagenetic Studies of the Jurassic Carbonates of the Kohat Basin, Northwest Pakistan: Reservoir Implications     

Emadullah KHAN  Abbas Ali NASEEM  Suleman KHAN  Bilal WADOOD  Faisal REHMAN  Maryam SALEEM  Mubashir MEHMOOD  Waqar AHMAD  Zubair AHMED  Tahir AZEEM 《《地质学报》英文版》2022,96(5):1673-1692

The present study deals with the depositional facies, diagenetic processes and sequence stratigraphy of the shallow marine carbonates of the Samana Suk Formation, Kohat Basin, in order to elucidate its reservoir quality. The Samana Suk Formation consists of thin to thick-bedded, oolitic, bioclastic, dolomitic and fractured limestone. Based on the integration of outcrop, petrographic and biofacies analyses, the unit is thought to have been deposited on a gentle homoclinal ramp in peritidal, lagoonal and carbonate shoal settings. Frequent variations in microfacies based sea-level curve have revealed seven Transgressive Systems Tracts (TSTs) and six Regressive Systems Tracts (RSTs). The unit has undergone various stages of diagenetic processes, including mechanical and chemical compaction, cementation, micritization, dissolution and dolomitization. The petrographic analyses show the evolution of porosity in various depositional and diagenetic phases. The fenestral porosity was mainly developed in peritidal carbonates during deposition, while the burial dissolution and diagenetic dolomitization have greatly enhanced the reservoir potential of the rock unit, as is further confirmed by the plug porosity and permeability analyses. The porosities and permeabilities were higher in shoal facies deposited in TSTs, as compared to lagoonal and peritidal facies, except for the dolomite in mudstone, deposited during RSTs. Hence good, moderate and poor reservoir potential is suggested for shoal, lagoonal and peritidal facies, respectively.  相似文献   

DEM-aided study of Coulomb and Roscoe theories for shear band inclination     

Hazeghian  Mohammad  Soroush  Abbas 《Acta Geotechnica》2022,17(8):3357-3375

Acta Geotechnica - In general, there are two classical solutions in soil mechanics to predict the shear band orientation in dense granular materials: the Coulomb and Roscoe theories. The present...  相似文献   

地震液化条件下重力式码头的变形破坏机理   总被引：3，自引：0，他引：3  

方云  东烟郁生 《地球科学》2001,26(4):415-418

现场调查发现在神户地震期间重力式码头破坏时都发生了相当大的侧向位移，因此，阐明挡土墙有变形机理对于改善抗震设计具有十分重要的意义。为此，根据相似原理设计了重力式码头的地基模型，进行了一系列的振动台试验。试验结果表明：基底土的强度降低和局部液化是挡土墙变形破坏的主导因素。墙后动土压力的增加为挡土墙的运动提供了条件。在液化条件下重力式码头地基的运动以侧向位移为主。重力作用是地基侧向运动的主要影响因素。减少作用于挡土墙上的动土压力和充分填实基底下的砂土是增加重力式码头抗震稳定性的重要措施。  相似文献   

Evolution of the lithosphere in Pakistan     

Abul Farah  Ghazanfar Abbas  Kees A. De Jong  Robert D. Lawrence 《Tectonophysics》1984,105(1-4)

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Experimental Study of the Effect of Clay and Oil Polarity on Oil Recovery by Low Salinity Water Flooding Using Glass Micromodel     

Kashiri  Razieh  Kalantariasl  Azim  Parsaei  Rafat  Zeinijahromi  Abbas 《Natural Resources Research》2021,30(5):3695-3716

Natural Resources Research - Low salinity water flooding (LSWF) has been recognized as one of the promising methods for enhanced oil recovery (EOR) in sandstone reservoirs. Both the positive...  相似文献   

Unstable modes of non-axisymmetric gaseous discs     

Naser M. Asghari  Mir Abbas Jalali 《Monthly notices of the Royal Astronomical Society》2006,373(1):337-348

We present a perturbation theory for studying the instabilities of non-axisymmetric gaseous discs. We perturb the dynamical equations of self-gravitating fluids in the vicinity of a non-axisymmetric equilibrium, and expand the perturbed physical quantities in terms of a complete basis set and a small non-axisymmetry parameter ε. We then derive a linear eigenvalue problem in matrix form, and determine the pattern speed, growth rate and mode shapes of the first three unstable modes. In non-axisymmetric discs, the amplitude and the phase angle of travelling waves are functions of both the radius R and the azimuthal angle φ. This is due to the interaction of different wave components in the response spectrum. We demonstrate that wave interaction in unstable discs, with small initial asymmetries, can develop dense clumps during the phase of exponential growth. Local clumps, which occur on the major spiral arms, can constitute seeds of gas giant planets in accretion discs.  相似文献   

喀纳斯自然保护区地衣生态地理分布的研究   总被引：1，自引：0，他引：1  

努尔巴衣·阿不都沙勒克  阿不都拉·阿巴斯 《干旱区地理》2000,23(1)

根据1985年以来实地考察的基础上,对保护区自然地理条件和地衣生长发育的地理背景进行了分析,对地衣植被的生态地理分布规律进行了初步探讨.并对地衣植被进行了生态分类.  相似文献