Consolidation behaviour of finely laminated clays     

M. M. Abid  I. C. Pyrah 《Computers and Geotechnics》1990,10(4):307-323

Thin highly permeable laminations have a significant influence on the rate of consolidation of many natural clays. Horne [1] presented analytical solutions for a particular type of problem. The range of solutions has been extended by the authors, who have used the more general finite element technique to solve consolidation problems of finely laminated clays under various geometry, load, and boundary conditions. Solutions are presented in graphical form to enable engineers to predict the rate of settlement for strip loads imposed on the surface of laminated clays. The effect of the laminations on the pore water pressure distribution, and the significant difference between a laminated (composite) material and an anisotropic material, are examined.  相似文献   

Jurassic radiolarian-bearing series of Tunisia: biostratigraphy and significance to western Tethys correlations     

Mabrouk Boughdiri  Fabrice Cordey  Houaïda Sallouhi  Kamel Maâlaoui  Amara Masrouhi  Mohamed Soussi 《Swiss Journal of Geoscience》2007,100(3):431-441

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Third-order Uranus-Neptune planetary theory     

Osman M. Kamel  Abdel Aziz Bakry 《Earth, Moon, and Planets》1988,41(2):97-116

In this part we calculate the secular and critical terms arising from the indirect part of the classical planetary Hamiltonian for Uranus and Neptune. We neglect in our expansions powers higher than the second in the eccentricity-inclination. Our required results, are expressed in terms of Poincaré variables.  相似文献   

Quasi-periodic orbits about the translunar libration point   总被引：2，自引：0，他引：2  

Farquhar  Robert W.  Kamel  Ahmed A. 《Celestial Mechanics and Dynamical Astronomy》1973,7(4):458-473

Analytical solutions for quasi-periodic orbits about the translunar libration point are obtained by using the method of Lindstedt-Poincaré and computerized algebraic manipulations. The solutions include the effects of nonlinearities, lunar orbital eccentricity, and the Sun's gravitational field. For a small-amplitude orbit, the orbital path as viewed from the Earth traces out a Lissajous figure. This is due to a small difference in the fundamental frequencies of the in-plane and out-of-plane oscillations. However, when the amplitude of the in-plane oscillation is greater than 32 379 km, there is a corresponding value of the out-of-plane amplitude that will produce a path where the fundamental frequencies are equal. This synchronized trajectory describes a halo orbit of the Moon.  相似文献   

Expansion of the first order planetary disturbing function by Smart's method     

Osman M. Kamel  Adel S. Soliman 《Earth, Moon, and Planets》1990,48(2):165-170

In this part we expand the indirect part of the planetary perturbing function by Smart's method, via Taylor's theorem. We neglect, in our expansion, terms of degree higher than the fourth with regard to the eccentricities and tangents of the inclinations.  相似文献   

White Dwarf Stars as Polytropic Gas Spheres     

M. I. Nouh  A. S. Saad  W. H. Elsanhoury  A. A. Shaker  B. Korany  T. M. Kamel 《Astrophysics》2016,59(4):540-547

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Evaluation,characterization and analytical application of a new composite material for removing metal ions from wastewater     

R. Yavari  S. J. Ahmadi  F. Farkhondehru  V. Gholipoor  L. Kamel 《International Journal of Environmental Science and Technology》2014,11(4):1073-1080

A new organic/inorganic composite based on polyacrylonitrile and stannic molybdophosphate (PAN–SMP) as an adsorbent was synthesized under various conditions. The physicochemical properties of this material were specified by elemental analysis, scanning electron microscopy, infrared spectroscopy and thermogravimetry studies. The synthesized material was found to be stable in demineralized water, in dilute acids, under gamma radiation up to the total radiated of 100 kGy doses and in high temperature up to 500 °C. Ion exchange capacity of the synthesized composite and its distribution coefficient (K _d) for several metal ions were determined. The results showed that PAN–SMP has a great affinity toward some metal ions such as T^l+, Sr²⁺, Ba²⁺, UO₂ ²⁺ and La⁴⁺. Based on the determined K _d values, two binary quantitative separations of metal ions (Cr⁶⁺ from Cu²⁺ and Pb²⁺ from Cu²⁺) have been achieved on columns of this ion exchanger. The ability of PAN–SMP to decontaminate low-level liquid waste was also investigated.  相似文献   

A second-order Uranus-Neptune theory by Hori's method     

Osman M. Kamel 《Earth, Moon, and Planets》1988,40(2):119-147

We shall establish a second order - with respect to a small parameter which is of the order of planetary masses - Uranus-Neptune canonical planetary theory. The construction will be through the Hori-Lie perturbation theory. We perform the elliptic expansions by hand, taking into account powers 0, 1, 2 of the eccentricity-inclination. Only the principal part of the planetary Hamiltonian will be taken into consideration. Our theory will be expressed in terms of the canonical variables of Henri Poincaré, referring the planetary coordinates to the Jacobi-Radau system of origin. Only U- N critical terms will be assumed as the periodic terms.  相似文献   

A second order Jupiter-Saturn planetary theory     

Osman M. Kamel  Abdel Aziz Bakry 《Earth, Moon, and Planets》1982,27(4):417-430

We present a second order secular Jupiter-Saturn planetary theory through Poincaré canonical variables, von Zeipel's method and Jacobi-Radau referential. We neglect in our expansions terms of power higher than the fourth with respect to eccentricities and sines of inclinations. We assume that the disturbing function is composed of secular and critical terms only. We shall deriveF _2si and writeF _2s in terms of Poincaré canonical variables in Part II of this problem.  相似文献   

Lie transforms and the Hamiltonization of non-Hamiltonian systems   总被引：1，自引：0，他引：1  

Ahmed Aly Kamel 《Celestial Mechanics and Dynamical Astronomy》1971,4(3-4):397-405

To develop the perturbation solution of the non-Hamiltonian system of differential equationsy=g(y, t; ), it is sufficient to obtain the perturbation solution of a Hamiltonian system represented by the HamiltonianK=Y·g(y, t; ) which is linear in the adjoint vectorY. This Hamiltonization allows the direct use of the perturbation methods already established for Hamiltonian systems. To demonstrate this fact, a Hamiltonian algorithm developed by this author and based on the Lie-Deprit transform is applied to the Hamiltonized system and is shown to be equivalent to the application of the non-Hamiltonian form of this same algorithm to the original non-Hamiltonian system.  相似文献