On the Use and Error of Approximation in the Domenico (1987) Solution     

C.E. Aziz  P.C. de Blanc  C.J. Newell 《Ground water》2009,47(1):5-6

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Voigt regularization for the explicit time stepping of the Hall effect term     

Aziz Takhirov 《地球物理与天体物理流体动力学》2016,110(5):409-431

This article studies the stabilization of the explicit time stepping methods for Hall Maxwell and incompressible Hall MHD equations. Since the Hall effect term contains two spatial derivatives, classical time-stepping schemes result in very restrictive CFL condition. We consider weakening the restrictive time step condition via Voigt regularization. We establish the energy stability result and validate our approach numerically. Numerical experiments demonstrate that we are able to take larger time steps, compared to classical schemes, at additional, negligible computational cost.  相似文献   

Spatial analysis of daily rainfall intensity and concentration index in Peninsular Malaysia   总被引：1，自引：0，他引：1  

Jamaludin Suhaila  Abdul Aziz Jemain 《Theoretical and Applied Climatology》2012,108(1-2):235-245

This study presents the spatial analysis of daily rainfall intensity and concentration index over Peninsular Malaysia. Daily rainfall data from 50 rainfall stations are used in this study. Due to the limited number of stations, the geostatistical method of ordinary kriging is used to compute the values of daily rainfall concentration and intensity and to map their spatial distribution. The resultant analysis of rainfall concentration indicated that the distribution of daily rainfall is more regular over the west, northwest and southwest regions compared to the east. Large areas of the eastern Peninsula display an irregularity in distribution of daily rainfall. In terms of number of rainy days, analysis of daily rainfall confirms that a large number of rainy days across the Peninsula arise from low-intensity events but only contribute a small percentage of total rain. On the other hand, a low frequency of rainy days with high-intensity events contributes the largest percentage of total rain. The results indicated that the total rain in eastern areas is mainly contributed by the high-intensity events. This finding explains the occurrence of a large number of floods and soil erosions in these areas. Therefore, precautionary measures should be taken earlier to prevent any massive destruction of property and loss of life due to the hazards. These research findings are of considerable importance in providing enough information to water resource management, climatologists and agriculturists as well as hydrologists for planning their activities and modelling processes.  相似文献   

Structural pattern and emplacement mechanism of the Neka Valley nappe complex,eastern Alborz,Iran     

Nabavi  Seyed Tohid  Rahimi-Chakdel  Aziz  Khademi  Mohsen 《International Journal of Earth Sciences》2017,106(7):2387-2405

International Journal of Earth Sciences - The Neka Valley nappe complex is exposed in the south of Gorgan County in the eastern Alborz fold-and-thrust belt. We use the results of a regional survey...  相似文献   

Performance of Surfactant Assisted Synthesis of Fe/TiO2 on the Photodegradation of Diisopropanolamine          下载免费PDF全文

Raihan Mahirah Ramli  Fai Kait Chong  Abdul Aziz Omar  Thanapalan Murugesan 《洁净——土壤、空气、水》2015,43(5):690-697

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Accurate determination of highly eccentric orbits in earth's gravtational field with axial symmetry     

A. Abdel Aziz Bakry 《Earth, Moon, and Planets》1988,41(1):77-88

In this paper, an algorithm is constructed for the determination of the perturbed motion, in both, the rectangular and the orbital elements of highly eccentric orbits in Earth's gravitational field with axial symmetry whatever the number N of the zonal harmonic coefficients may be. An application of the algorithm for the Explorer 28 satellite (e > 0.94) is given for two geopotential models corresponding to N = 2 and N = 36. In both examples extremely accurate predictions during the satellite life time are obtained.  相似文献   

Third-order Uranus-Neptune theory     

Abdel Aziz Bakry 《Earth, Moon, and Planets》1988,42(1):77-106

In this paper of the third order Uranus-Neptune planetary theory which is the third part of this work for the third order theory, we compute the Poisson brackets in the Lie series which is used to transform canonical variables. We apply Hori-Lie technique in this work and neglect all powers higher than the second in Poincaré variables H, K, P, Q. We restrict this work to the principal part of the disturbing function.  相似文献   

The construction of a third order secular     

Osman M. Kamel  Abdel Aziz Bakry  Salwa M. Waziry 《Earth, Moon, and Planets》1994,65(2):97-117

In this part we find out the 24 equations of secular perturbation equations for the subsystem J-S-U-N. The solution of these equations by the Lagrange-Laplace procedure and the Eigen value Eigen vector is analysed. Also we refer to Hurwitz theorem to test stability.  相似文献   

A comparative study of heavy metal concentrations in surficial sediments from coastal areas of Karachi, Pakistan     

Qari R  Siddiqui SA  Qureshi NA 《Marine pollution bulletin》2005,50(5):595-599

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Nonlinear effects on the distribution of crest-to-trough wave heights     

M.Aziz Tayfun 《Ocean Engineering》1983,10(2):97-106

The statistical distribution of the crest-to-trough heights of narrowband nonlinear sea waves is derived in a semi-closed form. A quantitative comparison of the resulting density and exceedance probability distributions with those of the linear theory is given. It is shown that the nonlinearity of waves, even with steepnesses typical of extreme sea states, has an insignificant influence on the distribution of crest-to-trough heights.  相似文献