Browsing by Issue Date

Browsing by Issue Date

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  • MOUSSA, A. H.; ABDEL-RADI, H. M. (Elsevier, 1973)
    The Kohn variational method with a multi-parameter trial wave function has been applied to the low-energy s-wave elastic scattering of positrons by helium atoms. The phase shifts obtained are in qualitative agreement with ...
  • MOUSSA, A.H.; RADI, H.M.A. (NORTH-HOLLAND PUBLISHING COMPANY, 1973)
    The calculations of bound state problems in atomic physics has advanced in the last ten years due to the progress in computers. The determination of the binding energy of atoms of more than two electrons [1, 21 is one of ...
  • Moussa, AH; RADI, H.M.A. (Elsevier, 1973)
    A variational calculation with a trial wave function including up to 17 parameters has been used to investigate the existence of a positron-helium bound state. The resulting binding energy was found to be greater than the ...
  • MOUSSA, A.H.; RADI, H.M.A. (Elsevier, 1973)
    A Rayleigh-Ritz variational calculation, to investigate the possibility of existence of a positron-helium bound state, is carried out using 9 different trial functions containing parameters of which the number varies from ...
  • Moussa, AH; Radi, HMA (IOP Publishing, 1974)
    The Kohn variational method has been applied to the zero energy positron-helium collisions. Results show that singularity persists in scattering length values, for variant IV of Peterkop and Rabik (1971), which may suggest ...
  • Nowaina, NHA; Scott, W; Firth, LD (IOP Publishing ا, 1974-09)
    The lattice parameters of The lattice parameters of solid solutions of magnesium and silver in lithium have been measured by X-ray diffraction, using extruded wire specimens. The results for the LiMg alloys are compared ...
  • Radi, H. M. A. (American Physical Society, 1975)
    Nonrelativistic wave functions and energy values for the ground state of helium are calculated accurately by using the conventional Rayleigh-Ritz technique. However, the trial wave functions used are more general than those ...
  • M A Radi, Hafez (IOP Publishing, 1977)
    Expressions for the two-electron atom wavefunctions of the various members of the helium isoelectronic sequence from Li+ to N5+, as well as He, are presented: these are applicable in physical, astrophysical and chemical ...
  • MA Radi, Hafez; Shihab-Eldin, AA; Rasmussen, JO (American Physical Society, 1977)
    A brief review of the development of α -decay-rate theory is given. Then in this paper are presented relative α decay-rate theoretical calculations for doubly odd spherical nuclei for 212 At and 212 At m ...
  • Mokhtar, M.O.A.; Zaki, M.; Shawki, G.S.A. (Elsevier, 1979)
    The effect of load and rubbing speed on frictional behaviour of a number of metals is investigated. The coefficient of kinetic friction, as determined in a modified pin and disc machine, is shown to increase with higher ...
  • Mokhtar, M.; Zaki, M.; Shawki, G. (Elsevier, 1979)
    The coefficient of friction was experimentally determined for some common metals and is correlated with their mechanical properties. Strong metals are shown to give a lower coefficient of friction and are characterised by ...
  • O.A. Mokhtar, Mokhtar; Zaki, Mohamed; S.A. Shawki, Galal (Elsevier, 1980)
    The surface topography of mating surfaces is characterized by plastically deformed asperities which form real areas of contact. As sliding leads to the shearing of junctions, it is feasible that physical properties will ...
  • A. Nagy, El-Sayed; Livesey, Frank (MCB UP Limited, 1980)
    Affiliated grocers on the whole tend to be well satisfied with group retailing, according to a study carried out by the authors. Nevertheless the loss of only a few percent of members over the year can amount to a considerable ...
  • A. Nagy, El-Sayed; Livesey, Frank (Journal of Retail and Distribution Management, 1981)
    The decline of the independent retailer as a result of the growing strength of the multiples has been a persistent factor in British retailing for decades, and the effectiveness of the affiliated retailer in fighting back ...
  • Rasmussen, J.O.; Radi, H.M.A.; Sullivan, J.P.; Frankel, K.A.; Hashimoto, O. (Lawrence Berkeley Lab, 1981)
    t has been known for over two years now that the ..pi../sup -/ spectrum from heavy ion collisions peaks near beam velocity and that the ..pi../sup +/ spectrum has a corresponding depression. It has been guessed that these ...
  • MA Radi, Hafez; O Rasmussen, John; Donangelo, Raul; F Canto, Luiz; F Oliveira, Luiz (American Physical Society, 1982)
    To compare with the wealth of new data on alpha-accompanied fission of 236 U * we have made new trajectory calculations. Initial conditions for several parameters were selected from Gaussian distributions by the Monte ...
  • A. Frankel, K.; Hashmoto, O.; A. Radi, Hafez; Rasmussen, J. O.; P. Sullivan, J. (American Physical Society, 1982)
    Coulomb effects on heavy-ion pion production cross sections are formulated in terms of weighted averaging over various projectile fragments. Satisfactory fits to zero-degree pion data are found for Ar + C and Ne + C ...
  • MA Radi, Hafez; O Rasmussen, John; A Frankel, Kenneth; P Sullivan, John; Song, HC (American Physical Society, 1983)
    The Coulomb effects on slow pions formed in heavy ion collisions are investigated here by Monte Carlo methods. The trajectory calculations differ from some earlier theoretical work in that pions are considered to be absorbed ...
  • A Mehrem, Rami; MA Radi, Hafez; O Rasmussen, John (American Physical Society, 1984)
    A model is presented for the scattering of obliquely incident relativistic pions from a region of uniform nuclear matter. A simple analytic method that incorporates a second order optical potential in the Klein-Gordon ...
  • Abdel-Hamid Mohamed Ali, Khayri (Royal Institute of Technology, 1984)