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   

The carrier-multipath observable: a new carrier-phase multipath mitigation technique   总被引：2，自引：1，他引：1  

Ramin Moradi  Wolfgang Schuster  Shaojun Feng  Altti Jokinen  Washington Ochieng 《GPS Solutions》2015,19(1):73-82

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From Gigahertz to Millihertz: A Multiwavelength Study of the Acoustically Active 14 August 2004 M7.4 Solar Flare     

J. C. Martínez-Oliveros  H. Moradi  D. Besliu-Ionescu  A.-C. Donea  P. S. Cally  C. Lindsey 《Solar physics》2007,245(1):121-139

We carried out an electromagnetic acoustic analysis of the solar flare of 14 August 2004 in active region AR10656 from the radio to the hard X-ray spectrum. The flare was a GOES soft X-ray class M7.4 and produced a detectable sun quake, confirming earlier inferences that relatively low energy flares may be able to generate sun quakes. We introduce the hypothesis that the seismicity of the active region is closely related to the heights of coronal magnetic loops that conduct high-energy particles from the flare. In the case of relatively short magnetic loops, chromospheric evaporation populates the loop interior with ionised gas relatively rapidly, expediting the scattering of remaining trapped high-energy electrons into the magnetic loss cone and their rapid precipitation into the chromosphere. This increases both the intensity and suddenness of the chromospheric heating, satisfying the basic conditions for an acoustic emission that penetrates into the solar interior.  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   

Helioseismic analysis of the solar flare-induced sunquake of 2005 January 15   总被引：1，自引：0，他引：1  

H. Moradi  A.-C. Donea  C. Lindsey  D. Besliu-Ionescu  P. S. Cally 《Monthly notices of the Royal Astronomical Society》2007,374(3):1155-1163

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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