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Search Results: 1 - 10 of 16373 matches for " Christina El-saaidi "
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Food Insecurity Is Associated with Increased Risk of Non-Adherence to Antiretroviral Therapy among HIV-Infected Adults in the Democratic Republic of Congo: A Cross-Sectional Study
Patou Masika Musumari, Edwin Wouters, Patrick Kalambayi Kayembe, Modeste Kiumbu Nzita, Samclide Mutindu Mbikayi, S. Pilar Suguimoto, Teeranee Techasrivichien, Bhekumusa Wellington Lukhele, Christina El-saaidi, Peter Piot, Masako Ono-Kihara, Masahiro Kihara
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0085327
Abstract: Background Food insecurity is increasingly reported as an important barrier of patient adherence to antiretroviral therapy (ART) in both resource-poor and rich settings. However, unlike in resource rich-settings, very few quantitative studies to date have investigated the association of food insecurity with patient adherence to ART in Sub-Saharan Africa. The current study examines the association between food insecurity and adherence to ART among HIV-infected adults in the Democratic Republic of Congo (DRC). Methods and Findings This is a cross-sectional quantitative study of patients receiving ART at three private and one public health facilities in Kinshasa, DRC. Participants were consecutively recruited into the study between April and November 2012. Adherence was measured using a combined method coupling pharmacy refill and self-reported adherence. Food insecurity was the primary predictor, and was assessed using the Household Food Insecurity Access Scale (HFIAS). Of the 898 participants recruited into the study, 512 (57%) were food insecure, and 188 (20.9%) were not adherent to ART. Food insecurity was significantly associated with non-adherence to ART (AOR, 2.06; CI, 1.38–3.09). We also found that perceived harmfulness of ART and psychological distress were associated respectively with increased (AOR, 1.95; CI, 1.15–3.32) and decreased (AOR, 0.31; CI, 0.11–0.83) odds of non-adherence to ART. Conclusion Food insecurity is prevalent and a significant risk factor for non-adherence to ART among HIV-infected individuals in the DRC. Our findings highlight the urgent need for strategies to improve food access among HIV-infected on ART in order to ensure patient adherence to ART and ultimately the long-term success of HIV treatment in Sub-Saharan Africa.
Large-N limit of non-local 2D generalized Yang-Mills theories on non-orientable surface
Khaled Saaidi
Physics , 2003, DOI: 10.1142/S0217751X04017707
Abstract: The large-group behavior of the non-local two dimensional generalized Yang-Mills theories (nlgYM$_2$'s) on arbitrary closed non-orientable surfaces is investigated. It is shown that all order of $\phi^{2k}$ model of these theories have thired order phase transition only on projective plane (RP$^2$). Also the phase structure of $\phi^2 + \frac{\gamma}{4}\phi^4$ model of nlgYM$_2$ is studied and it is found that for $\gamma >0$, this model has third order phase transition only on RP$^2$ and for $\gamma<0$ it has third order phase transition on any closed non-orientable surfaces except RP$^2$ and Klein bottel.
(Non-) geodesic motion in chameleon Brans Dicke model
Khaled Saaidi
Physics , 2012, DOI: 10.1007/s10509-013-1407-4
Abstract: Based on \cite{16}, we assume there is a non-minimal coupling between the scalar field and matter in Brans-Dicke model. We analyzes the motion of different matter such as, massless scalar field, photon, massless perfect fluid (dust), massive perfect fluid and point particle matter in this theory. We show that the motion of massless scalar field and photon can satisfy null geodesic motion only in high frequency limit. Also we find that the motion of the dust and massive perfect fluid is geodesic for $L_m=-P$ and is non-geodesic for $L_m=\R$. Finally, we study the motion of point particle and show that the motion of this kind of matter is non-geodesic.
A Dirac Particle in a Complex Potential
Khaled Saaidi
Physics , 2003,
Abstract: It has been observed that a quantum mechanical theory need not to be Hermitian to have a real spectrum. In this paper we obtain the eigenvalues of a Dirac charged particle in a complex static and spherically symmetric potential. Furthermore, we study the Complex Morse and complex Coulomb potentials.
Eigenvalue Spectrum of a Dirac Particle in Static and Spherical Complex Potential
Khaled Saaidi
Physics , 2003, DOI: 10.1023/B:IJTP.0000048593.26103.a7
Abstract: It has been observed that a quantum theory need not to be Hermitian to have a real spectrum. We study the non-Hermitian relativistic quantum theories for many complex potentials, and we obtain the real relativistic energy eigenvalues and corresponding eigenfunctions of a Dirac charged particle in complex static and spherically symmetric potentials. Complex Dirac-Eckart, complex Dirac-Rosen-Morse II, complex Dirac-Scarf and complex Dirac-Poschl-Teller potential are investigated.
Wath Time an Incident Wave Packet is Reflected?
Khaled Saaidi
Physics , 2005,
Abstract: We study the one dimensional time dependent Schr\"{o}dinger equation for a potential step with $E < V_0$. We obtain the wave is not instantaneously reflected, but for a few moment of time the wave packet penetrate into inaccessible classically region and then reflected. So it is shown that one can write the peneterated wave paket as superposition of incident and reflected wave packets like.
More on Exact $\CP$-Symmetric Quantum Mechanics
Khaled Saaidi
Physics , 2003,
Abstract: In this article, we discussed certain properties of non-Hermitian $\CP$-symmetry Hamiltonian, and it is shown that a consistent physical theory of quantum mechanics can be built on a ${\cal C} \CP$-symmetry Hamiltonian. In particular, we show that these theories have unitary time evolution, and conservation probability. Furthermore, transition from quantum mechanics to classical mechanics is investigate and it is found that the Ehrenfest theorem is satisfied.
Stability of Ghost Dark Energy in CBD Model of Gravity
Khaled Saaidi
Physics , 2012,
Abstract: We study the stability of the ghost dark energy model versus perturbation. Since this kind of dark energy is instable in Einsteinian general relativity theory, then we study a new type of Brans-Dicke theory which has non-minimal coupling with matter which is called chameleon Brans-Dicke (CBD) model of gravity. Due to this coupling the equation of conservation energy is modified. For considering the stability of the model we use the adiabatic squared sound speed, $c_s^2$, whose sign of it determines the stability of the model in which for $c_s^2 >0 $ the model is stable and for $c_s^2 <0 $ the model is instable. However, we study the interacting and non-interacting version of chameleon Brans-Dicke ghost dark energy (CBDGDE) with cold dark matter in non flat FLRW metric. We show that in all cases of investigation the model is stable with a suitable choice of parameters.
Does a Creative Learning Medium Matter? Impact of Low Cost Android Tablets on Elementary Students’ English Comprehension, Perceived Performance and Memory Retention  [PDF]
Ibrahim El-Mouelhy, Issac Hin Chun Poon, Anna Na Na Hui, Christina Sue-Chan
Creative Education (CE) , 2013, DOI: 10.4236/ce.2013.412A2007
Abstract: Introduction: Android tablet is a relatively newer and cheaper portal electronic device that can be used as a creative learning tool in elementary school setting compared with laptop. However, the effect of Android tablet on students’ learning performance has been rarely studied. Before encouraging schools to implant Android tablet in teaching process, it should be ensured that tablet should at least do no harm on students’ academic performance. This research aims to investigate the impact of an innovative medium—a low cost Android tablet versus paper—on elementary students’ reading comprehension, perceived comprehension performance, and memory retention, and discuss about the implication of the finding and future directions. Method: In Study 1, 18 fourth-graders and 36 sixth-graders read 2 grade-appropriate passages on either a tablet or paper and completed related comprehension tests, then assessed their perceived performance. In Study 2, 16 first-graders attempted to memorize 25 pictures displayed on tablets while another 12 first-graders attempted to memorize 25 pictures displayed on paper. After 1 minute filler activity, participants were shown 50 pictures and asked to identify those they had attempted to memorize. Results: In Study 1, results showed that fourth-graders comprehended better when reading on paper, whereas sixth-graders scored similarly on both media. An interaction effect between “medium” and “gender” was found in the perceived performance of fourth-graders, with boys reporting higher perceived performance when using tablets. In Study 2, first-graders experienced better memory retention when they viewed pictures on paper. Conclusion: The introduction of Android tablets in the classroom did not have a significant negative impact on sixth-graders’ reading comprehension. However, some caution is required when introducing tablets to first-graders and fourth-graders because of the negative effect found in this study. It should also be noted that the use of tablets may enhance the confidence of grade 4 boys during comprehension tasks, but the confidence of grade 4 girls engaged in the same activities may be deteriorated.
Analysis of Poisson Networks and Their Relation with Random Cellular Structures
V. Karimipour,Kh. Saaidi
Physics , 1996,
Abstract: We perform a detailed analysis of the statistical properties of Poisson networks and show that the metric and topological properties of random cellular structures, can not be derived from simple models of random networks based on a poisson point distribution [1]. In particular we show that Lewis and Aboav-Wieare laws are not obeyed in these network.
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