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Search Results: 1 - 10 of 318316 matches for " R. O. Hussein "
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Processing-Microstructure Relationships in the Plasma Electrolytic Oxidation (PEO) Coating of a Magnesium Alloy  [PDF]
R. O. Hussein, D. O. Northwood, X. Nie
Materials Sciences and Applications (MSA) , 2014, DOI: 10.4236/msa.2014.53017
Abstract:

In the plasma electrolytic oxidation (PEO) coating of light metal alloys, changing the electrical parameters and electrolytic composition can change the discharge behaviour and, ultimately, the thickness, surface morphology and porosity of the coating. In the present study a combination of cathodic and anodic current pulses with suitable Ton and Toff periods were used to control the porosity and other structural defects of PEO coatings of an AM60B magnesium alloy. In order to investigate the effect of a current mode on the plasma discharge behaviour and coating microstructure during the PEO treatment of magnesium alloy, the emission intensities of six different spectral lines from the plasma species were recorded simultaneously as a function of both time and current mode using optical emission spectroscopy (OES) system. The fluctuations in signal intensities and temperature during the coating process reflect differences in location of both the discharge initiation, and discharge type. The coating surface morphology and microstructure that are obtained can be linked to the plasma discharge behavior. These results are discussed in relation to the discharge behaviour, and how such changes in discharge behaviour relate to the coating mechanisms.

Societal perspectives on community pharmacy services in West Bank-Palestine
Khdour,Maher R.; Hallak,Hussein O.;
Pharmacy Practice (Internet) , 2012, DOI: 10.4321/S1886-36552012000100004
Abstract: understanding the public's view of professional competency is extremely important; however little has been reported on the public′s perception of community pharmacists in palestine objectives: to determine the perception of palestinian consumers of the community pharmacist and the services they offer method: this project used the survey methodology administered by structured interviews to consumers who attended the 39 randomly selected pharmacies, in six main cities in palestine. the questionnaire had range of structured questions covering: consumers′ patronage patterns, consumers′ interaction with community pharmacists, consumers′ views on how the pharmacist dealt with personal health issues, procedure with regard to handling private consultations. results: of 1,017 consumers approached, 790 consumers completed the questionnaire (77.7 %). proximity to home and presence of knowledgeable pharmacist were the main reasons for patients to visit the same pharmacy. physicians were identified as the preferred source of advice by 57.2% and pharmacists by 23.8%. only 17% of respondents considered pharmacists as health professionals who know a lot about drugs and are concerned about and committed to caring for the public. in addition, 49% indicated that pharmacists spoke more quietly cross the counter during counseling and almost one third reported that the pharmacist used a private area within the pharmacy. the majority of respondents would be happy to receive different extended services in the community pharmacy like blood pressure monitoring. conclusions: palestinian consumers have a positive overall perception of community pharmacists and the services they offer. awareness should be created amongst the public about the role of pharmacist and the added value they can provide as health care professional. there is a need to consider privacy when giving patient counseling to increase user satisfaction.
Comparative Study between Lidocaine 2% and Dexamethasone Local Wound Infiltration Effect on Postoperative Pain Post Mastectomy: A Randomized Controlled Study  [PDF]
Hussein O. Soliman
Advances in Breast Cancer Research (ABCR) , 2018, DOI: 10.4236/abcr.2018.74015
Abstract: Objective: To compare the efficacy and safety of Lidocaine 2% versus Dexamethasone injected locally in mastectomy wound as pain relieving agents. Materials & Methods: A randomized single-blinded study in which 50 patients candidate for Mastectomy were included. Participants were equally randomized into two groups; Group A, in which patients received 10 ml Lidocaine 2% and Group B, in which patients received 16 mL Dexamethasone. In both groups, the drugs were given via local infiltration in the subcutaneous layer of the Mastectomy wound immediately after skin closure. Pain control was assessed post-operatively in the first 24 hours using the visual analogue scale (VAS) in addition the need for additional analgesia was recorded. Results: There was a statistically significant lower VAS score in group A (Lidocaine group) when compared to those in group B (Dexamethasone group) 1 h, 6 h, 12 h postoperatively with no significance 24 h postoperatively (36% vs 64% 1 h, 28% vs 64% 6 h, 30% vs 72% 12 h and, 80% vs 60% 24 h). This statistical significance was evident throughout the post-operative hours (1 h, 6 h, 12 h). Though local Lidocaine caused marked improvement of pain in bigger number of patients in group A than group B, yet it showed no statistical significance 24 h post-mastectomy. Furthermore, the number of participants that needed additional doses of analgesia lower in group A (48% vs 56%) in comparison to group B, but still showed no statistical
The Efficacy of Podophyllin Cautery Added to Surgical Excision for Eradication of Vulvar Condylomata Accuminata; Randomized Controlled Trial  [PDF]
Hussein O. Soliman, Yossra Lashin
Journal of Cancer Therapy (JCT) , 2018, DOI: 10.4236/jct.2018.97047
Abstract: Context: Condyloma acuminatum is a common morbidity caused by human papillomavirus infection. Objective: To compare the recurrence rate after surgical excision with or without podophyllin cautery. Design, Setting, Participants: Sixty women were enrolled in a study that was conducted in Cairo from Jan-2017 to Mar-2018. Interventions: All women received the same preparations. After randomization; in the study group (N = 30), podophyllin cautery was added to surgical removal in the follow-up period. In the control group (N = 30), only surgical removal was used. Main Outcome Measure: The
Nonlinear Enhancement of the Multiphonon Coulomb Excitation in Relativistic Heavy Ion Collisions
M. S. Hussein,A. F. R. de Toledo Piza,O. K. Vorov
Physics , 1998, DOI: 10.1103/PhysRevC.59.R1242
Abstract: We propose a soluble model to incorporate the nonlinear effects in the transition probabilities of the multiphonon Giant Dipole Resonances based on the SU(1,1) algebra. Analytical expressions for the multi-phonon transition probabilities are derived. Enhancement of the Double Giant Resonance excitation probabilities in relativistic ion collisions scales as $(2 k +1)(2k)^{-1}$ for the degree of nonlinearity $(2k)^{-1}$ and is able to reach values $1.5-2$ compatible with experimental data. The enhancement factor is found to decrease with increasing bombarding energy. [KEYWORDS: Relativistic Heavy Ion Collisions,Double Giant Resonance]
Anomalous anapole moment of an exotic nucleus
M. S. Hussein,A. F. R. de Toledo Piza,O. K. Vorov,A. K. Kerman
Physics , 2001, DOI: 10.1016/S0375-9474(00)00519-4
Abstract: Using the information on the nuclear structure of exotic neutron-rich halo nucleus $^{11}$Be, we evaluate the parity violating anapole moment in its ground state. The resulting value $\kappa(^{11}$Be)$=0.17$ is fifteen times bigger than the typical value of the anapole moment of a normal nucleus of the same mass, and in fact exceeds by few times anapole moments of any known neutron-odd nuclei (e.g., kappa(^{11}Be) > 2|\kappa(^{207}Pb)|. It is also few times bigger than the neutral current contribution to the lepton-nucleus interaction.
Two Dimensional Honeycomb Materials: random fields, dissipation and fluctuations
T. Frederico,O. Oliveira,W. de Paula,M. S. Hussein,T. R. Cardoso
Physics , 2015,
Abstract: In this paper, we propose a method to describe the many-body problem of electrons in honeycomb materials via the introduction of random fields which are coupled to the electrons and have a Gaussian distribution. From a one-body approach to the problem, after integrating exactly the contribution of the random fields, one builds a non-hermitian and dissipative effective Hamiltonian with two-body interactions. Our approach introduces besides the usual average over the electron field a second average over the random fields. The interplay of two averages enables the definition of various types of Green's functions which allow the investigation of fluctuation-dissipation characteristics of the interactions that are a manifestation of the many-body problem. In the current work we study only the dissipative term, through the perturbative analysis of the dynamics associated the effective Hamiltonian generated by two different kinds of couplings. For the cases analysed, the eigenstates of the effective Hamiltonian are complex and, therefore, some of the states have a finite life time. Moreover, we also investigate, in the mean field approximation, the most general parity conserving coupling to the random fields and compute the width of charge carriers $\Gamma$ as a function of the Fermi energy $E_F$. The theoretical prediction for $\Gamma (E_F)$ is compared to the available experimental data for graphene. The good agreement between $\Gamma_{theo}$ and $\Gamma_{exp}$ suggests that description of the many-body problem associated to the electrons in honeycomb materials can indeed be done via the introduction of random fields.
Giant Resonances in Coulomb Excitations of Relativistic Ions
M. S. Hussein,A. F. R. de Toledo Piza,O. K. Vorov
Physics , 1999,
Abstract: We propose a soluble model to incorporate the nonlinear effects in the transition probabilities of the multiphonon Giant Dipole Resonances based on the SU(1,1) algebra. Analytical expressions for the multi-phonon transition probabilities are derived. For reasonably small magnitude of nonlinearity $x\simeq 0.1-0.2$ enhancement factor for the Double Giant Resonance excitation probabilities and the cross sections %in relativistic ion collisions reaches values $1.3-2$ compatible with experimental data.
SU(2,1) Dynamics of Multiple Giant Dipole Resonance Coulomb Excitation
M. S. Hussein,A. F. R. de Toledo Piza,O. K. Vorov
Physics , 1999, DOI: 10.1006/aphy.2000.6066
Abstract: We construct a three-dimensional analytically soluble model of the nonlinear effects in Coulomb excitation of multiphonon Giant Dipole Resonances (GDR) based on the SU(2,1) algebra. The full 3-dimensional model predicts further enhancement of the Double GDR (DGDR) cross sections at high bombarding energies. Enhancement factors for DGDR measured in thirteen different processes with various projectiles and targets at different bombarding energies are well reproduced with the same value of the nonlinearity parameter with the exception of the anomalous case of $^{136}$Xe which requires a larger value.
Enhancement of parity violating mixing in halo nuclei and the problem of neutron weak parity nonconserving potential constant
M. S. Hussein,A. F. R. de Toledo Piza,O. K. Vorov,A. K. Kerman
Physics , 1999, DOI: 10.1103/PhysRevC.60.064615
Abstract: We consider the Parity Nonconserving (PNC) mixing in the ground state of exotic (halo) nuclei caused by the PNC weak interaction between outer neutron and nucleons within nuclear interior. For the nucleus $^{11}Be$ as an example of typical nucleus with neutron halo, we use analytical model for the external neutron wave functions to estimate the scale of the PNC mixing. The amplitude of the PNC mixing in halo state is found to be an order of magnitude bigger than that of typical PNC mixing between the ``normal'' nuclear states in nearby nuclei. The enhanced PNC mixing in halo cloud is proportional to the neutron weak PNC potential constant $g^W_n$ only.
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