Al Aqsa University

Jerusalem, Israel

Al Aqsa University

Jerusalem, Israel

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Radwan M.A.,Al Aqsa University | Sumour M.A.,Al Aqsa University | Elbitar A.M.,Islamic University of Gaza | Shabat M.M.,Islamic University of Gaza | Lima F.W.S.,Federal University of Piauí
International Journal of Modern Physics C | Year: 2016

In scale-free Barabási–Albert (BA) networks, we study the finite-size effect at different number m of neighbors. So, we investigate the effects of finite network size N for the recently developed semi-directed BA networks (SDBA1 and SDBA2) at fixed (Formula presented.)) and show and explain the gap in the distribution of the number (Formula presented.) of neighbors of the nodes i. © 2016 World Scientific Publishing Company


Sumour M.A.,Al Aqsa University | Lima F.W.S.,Federal University of Piauí
International Journal of Modern Physics C | Year: 2016

On Barabási–Albert networks (BA) and variations as well as on Erdös–Rényi (ER) random graphs, we study the occurrence of a gap in the neighbor numbers (Formula presented.) versus node index (Formula presented.) (with (Formula presented.)) at (Formula presented.), 4, 6, 10, 50, 100 and 150 and with up to (Formula presented.) nodes. Here, we call “gap” a jump in the neighbor numbers (Formula presented.) when (Formula presented.) equals the initial number (Formula presented.) of neighbors; (Formula presented.) is also the number of neighbors randomly selected by a newly added node. The size of the gap depends on the value of (Formula presented.) and causes a deformation in the structure (Formula presented.) of the networks studied here. We give a systematic investigation of the gap in all types of BA networks known to us, and only the undirected BA (UBA) network and the ER graphs show no gap for (Formula presented.). © 2017 World Scientific Publishing Company


El-Aila H.J.Y.,Al Aqsa University
Journal of Dispersion Science and Technology | Year: 2010

In this article, a mononuclear Mn(Niten)2H2O complex was prepared to catalyze hydrolysis of p-nitrophenyl acetate (PNPA) in presence of Cetyltrimethylammonium bromide (CTAB) micellar system in different pH range from 6.5-10 at 25°C. These results obtained indicate that the complex exhibits good catalytic function. It also appears the complex accelerates the hydrolytic cleavage of PNPA in cationic CTAB micellar solution which may be due to coordinating ability of substrate to complex, electrostatic interaction between micelles and complex and due to electrostatic interaction between micelles with reactant. © Taylor & Francis Group, LLC.


Sumour M.A.,Al Aqsa University | Radwan M.A.,Al Aqsa University
International Journal of Modern Physics C | Year: 2012

In usual scale-free networks of BarabásiAlbert type, a newly added node selects randomly m neighbors from the already existing network nodes, proportionally to the number of links these had before. Then the number n(k) of nodes with k links each decays as 1/k γ where γ = 3 is universal, i.e. independent of m. Now we use a limited directedness in building the network, as a result of which the exponent γ decreases from 3 to 2 for increasing m. © 2012 World Scientific Publishing Company.


El-Khozondar H.J.,TU Munich | El-Khozondar H.J.,Islamic University of Gaza | Muller M.S.,TU Munich | Buck T.C.,TU Munich | And 3 more authors.
Fiber and Integrated Optics | Year: 2010

Recently, a formulation of the polarization rotation in twisted optical fibers was derived using a coupled-mode approach that, other than existing theories, employs a fixed reference frame. This is interesting for fiber sensing applications, where perturbations, such as strains, are conventionally given in a fixed laboratory reference frame. Hence, the derived theory can easily be integrated into existing formulations in the laboratory reference frame. This work demonstrates the experimental verification of the derived theory. An optical fiber is mechanically twisted using an automated test stand, and the change in polarization is recorded. The results are consistent with the theory. Copyright © Taylor & Francis Group, LLC.


El-Khozondar H.J.,Islamic University of Gaza | Muller M.S.,TU Munich | El-Khozondar R.J.,Al Aqsa University | Koch A.W.,TU Munich
2011 ICO International Conference on Information Photonics, IP 2011 | Year: 2011

The growth in the capacity of electric power system creates a necessity demand on protection relaying systems. Optical current transducers (OCT) which are mainly single mode optical fiber subjected to Faraday rotation are used as replacement for EM transducers for their immunity to the EM interference. However, the sensitivity to currents depends on the Verdet constant which is low in optical fiber but the optical path length can be increased to compensate for it by winding the fiber around a current carrying element a large number of turns. In this work, we would like to study the effect of the inhomogeneity of the magnetic field induced by the current in the sensitivity of the optical fiber sensor. © 2011 IEEE.


El Kichaoui A.,Islamic University of Gaza | Abu Zayed M.A.,Islamic University of Gaza | Ayesh B.M.,Al Aqsa University
Emirates Journal of Food and Agriculture | Year: 2013

Date palm (Phoenix dactylifera L.) is one of the major fruit crops in the Gaza Strip. The main cultivars are Hayani, Bentaisha, Barhi, Zahedi, Ameri and Halawy. Because of the difficulty associated with morphological identification of date palm cultivars, development of cultivar specific genetic markers have been extensively studied. The purpose of this study was to optimize and apply a reliable molecular marker protocol for genotyping and identification of these cultivars. Random amplification of polymorphic DNA (RAPD) was used to study the genetic diversity among the six cultivars using 42 primers. Genetic similarity matrices were constructed for the six cultivars using the Nei and Li formula and clustered with the UPGMA to determine the relationships between the six cultivars. Nine primers were informative and reproducible, and gave a number of polymorphic bands (on average, 7.2 bands per primer). The overall level of polymorphism was 49%. Genetic similarity among the six cultivars ranged from 76.3 to 93.5%. Some primers gave reproducible cultivar-specific bands that may be reliable to identify that cultivar. Our study introduces for the first time a molecular marker approach, capable of distinguishing and studying the genetic diversity among the six date palm cultivars in the Gaza Strip.


El-Khozondar H.J.,TU Munich | El-Khozondar R.J.,Al Aqsa University | Shabat M.M.,Islamic University of Gaza | Koch A.W.,TU Munich
Optik | Year: 2011

In advanced optical fiber communication systems where reflection light might cause degradation of the signal quality, optical waveguide isolators play an important role. The effect of a metal layer with negative permittivity on the behavior of nonlinear-magnetooptic isolator is studied. The isolator consists of metal film, nonlinear cladding, and magnetooptic substrate. It is found that difference between forward and backward propagation for TM0 mode increases with increasing the absolute value of the tuning parameter which is the permittivity of the metal film, εf. It is also found that the maximum cut-off thickness of the isolator occurs in self-defocusing case around η = 0.65 and at the highest assumed value of εf = -8. These results are helpful in fabricating an isolator with high performance. © 2010 Elsevier GmbH. All rights reserved.


PubMed | Al Aqsa University
Type: Journal Article | Journal: BMC hematology | Year: 2014

The genetic polymorphism of thiopurine methyltransferase (TPMT) is well characterized in most populations. Four common polymorphic alleles are associated with impaired activity of the enzyme. These are TPMT*2 (238G>C), TPMT*3B (c.460G>A), TPMT*3A (c.460G>A and c.719A>G) and TPMT*3C (c.719A>G). The aim of the present study was to determine the frequency of TPMT polymorphisms and their association with the occurrence of adverse events, during 6-mercaptopurine therapy in pediatric acute lymphoblastic leukemic (ALL) patients in Gaza Strip.A total of 56 DNA samples from all pediatric ALL patients admitted to the pediatric hematology departments of Gaza strip hospitals were analyzed. Genomic DNA from peripheral blood leukocytes was isolated and the TPMT*2, TPMT*3B TPMT*3A and TPMT*3C allelic polymorphism was determined by PCR-RFLP and allele specific PCR technique.No TPMT*2, *3B or *3C alleles were detected. Only one, out of 56 patients, was found heterozygous for the TPMT*3A allele. Thus, the frequency of TPMT*3A allele was calculated to be 0.89%. Fourteen patients of ALL were suffering from myelotoxicity during 6-MP therapy. From our results, no significant association could be established between clinical and laboratory data and/or the presence of the mutation in TPMT gene.TPMT*3A was the only deficiency allele detected in our population with an allelic frequency of 0.89%. Other polymorphic alleles in TPMT gene, or factors other than TPMT polymorphisms may be responsible for the development of myelosuppression in cases that dont carry the investigated TPMT alleles (*2, *3A, *3B and *3C). Therefore, more studies are recommended to study such factors.

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