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Search Results: 1 - 10 of 462359 matches for " Abdullwahab A. Sultan "
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Dielectric Properties and a.c. Conductivity of Epoxy/Alumina Silicate NGK Composites  [PDF]
Waleed A. Hussain, Abdullah A. Hussein, Jabar M. Khalaf, Ali H. Al-Mowali, Abdullwahab A. Sultan
Advances in Chemical Engineering and Science (ACES) , 2015, DOI: 10.4236/aces.2015.53028
Abstract: Alumina silicate powder which is extracted from the obsolete spark plug NGK (insulator part as a filler) has been used to produce epoxy/alumina silicate composite. The dielectric behavior of the composite materials (epoxy resin-alumina silicate NGK) is analyzed as a function of the filler content, temperature and frequency. AC conductivity and impedance are also studied. The results show that the permittivity, dielectric loss and loss tangent for all composites increase with increasing alumina silicate NGK filler content.
Reconnection of Vortex Bundles Lines with Sinusoidally  [PDF]
Sultan Z. Alamri, Abeer A. Alenezi
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.46130
Abstract: Using the vortex filament model with the full Biot-Savart law, we show that non-straight bundles of quantized vortex lines in HeII are structurally robust and can reconnect with each other maintaining their identity. We discuss vortex stretching in superfluid turbulence in many cases. We show that, during the bundle reconnection process, Kelvin waves of large amplitude are generated, in agreement with previous work and with the finding that helicity is produced by nearly singular vortex interactions in classical Euler flows. The reconnection events lead to changes in velocities, radius, number of points and total length. The existence of reconnections was confirmed by other authors using the model of nonlinear Schr?dinger equation (NLSE). Our results are agreed with the finding of other authors and extension to our numerical experiments.
Evaluation of Pre-qualification Criteria: Client Perspective; Jordan Case Study
Sultan A. Tarawneh
Journal of Applied Sciences , 2004,
Abstract: The purpose of this work is to identify the perception of the major clients on the importance of the pre-qualification criteria used to qualify contractors in the Jordanian construction industry. Also, it is aimed to provide suggestions for contractors to increase their chances in being pre-qualified by major clients. To achieve the objective of this work, the findings of previous exploratory qualitative interviews with owners, directors and senior managers of major client organizations in Jordan have been examined. The findings of this work indicated that public and private clients have different views about the importance and priorities of the pre-qualification criteria. Public clients place more weight on price after the contractor has been qualified. Special pre-qualification criteria are highly needed in Jordanian construction industry to meet the new requirement such as good manufacturing practice.
Clinical management of supernumerary teeth: A report of two cases
Mittal M,Sultan A
Journal of the Indian Society of Pedodontics and Preventive Dentistry , 2010,
Abstract: Supernumerary tooth may closely resemble the teeth of the group to which it belongs, i.e. molars, premolars or anterior teeth, or it may bear little resemblancein size or shape to which it is associated. Many complications can be associated with supernumeraries, like impaction, delayed eruption or ectopic eruption of adjacent teeth, crowding, development of median diastema and eruption into floor of the nasal cavity. This may also cause the formation of follicular cysts with significant bone destruction. Early intervention to remove it is usually required to obtain reasonable alignment and occlusal relationship. This article will present the clinical management of an (i) impacted supernumerary tooth impeding the eruption of maxillary central incisor and (ii) erupted supernumerary tooth with midline diastema.
Design of Compact Dual Notched Self-Complementary UWB Antenna  [PDF]
K. S. Sultan, O. M. A. Dardeer, H. A. Mohamed
Open Journal of Antennas and Propagation (OJAPr) , 2017, DOI: 10.4236/ojapr.2017.53008
Abstract: In this paper, a novel double notched UWB antenna is introduced. The proposed antenna is Quasi Self-Complementary (QSC) with wide impedance bandwidth from 2.2 GHz to more than 12 GHz. The antenna consists of semi-ring with rectangular tapered section for more matching and it is designed on FR-4 substrate with thickness 1.5 mm and has compact size of 11.5 × 14.5 × 1.5 mm3. The dual notched bands are achieved by using a T-shaped slit etched in the radiating patch to reject interference with WIMAX band and two C-shaped are placed close to the microstrip feed line to reject the interference with the WLAN band. The proposed antenna is designed, simulated and measured. All simulation results are performed using the CST software. Good agreement is presented between the experimental and the simulated results.
Differential Geometry of the Lie algebra of the quantum plane
Salih ?elik,Sultan A. ?elik
Mathematics , 2003, DOI: 10.1007/s10582-006-0083-9
Abstract: We present a differential calculus on the extension of the quantum plane obtained considering that the (bosonic) generator $x$ is invertible and furthermore working polynomials in $\ln x$ instead of polynomials in $x$. We call quantum Lie algebra to this extension and we obtain its Hopf algebra structure and its dual Hopf algebra. Differential geometry of the quantum Lie algebra of the extended quantum plane and its Hopf algebra structure is obtained. Its dual Hopf algebra is also given.
Differential Geometry of the q-plane
Sultan A. Celik,Salih Celik
Mathematics , 2001, DOI: 10.1142/S0217751X00002054
Abstract: Hopf algebra structure on the differential algebra of the extended $q$-plane is defined. An algebra of forms which is obtained from the generators of the extended $q$-plane is introduced and its Hopf algebra structure is given.
Two-parameter differential calculus on the h-superplane
Salih Celik,Sultan A. Celik
Mathematics , 2001, DOI: 10.1063/1.533066
Abstract: We introduce a noncommutative differential calculus on the two-parameter $h$-superplane via a contraction of the (p,q)-superplane. We manifestly show that the differential calculus is covariant under $GL_{h_1,h_2}(1| 1)$ transformations. We also give a two-parameter deformation of the (1+1)-dimensional phase space algebra.
The properties of the quantum supergroup $GL_{p,q}(1|1)$
Salih Celik,Sultan A. Celik
Mathematics , 2001,
Abstract: In this paper properties of the quantum supermatrices in the quantum supergroup $GL_{p,q}(1|1)$ are discussed. It is shown that any element of $GL_{p,q}(1|1)$ can be expressed as the exponential of a matrix of non-commuting elements, like the group $GL_q(1|1)$. An explicit construction of this exponential representation is presented.
Two-parameter nonstandard deformation of 2x2 matrices
Salih Celik,Sultan A. Celik
Mathematics , 2001, DOI: 10.1063/1.532907
Abstract: We introduce a two-parameter deformation of 2x2 matrices without imposing any condition on the matrices and give the universal R-matrix of the nonstandard quantum group which satisfies the quantum Yang-Baxter relation. Although in the standard two-parameter deformation the quantum determinant is not central, in the nonstandard case it is central. We note that the quantum group thus obtained is related to the quantum supergroup $GL_{p,q}(1|1)$ by a transformation.
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