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Search Results: 1 - 10 of 217 matches for " Ziad Alonzi "
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Assessment of Levels of Knowledge towards Hormonal Related Breast Cancer Risk Factors in Qurayyat, Northern Saudi Arabia  [PDF]
Abdelbaset Mohamed Elasbali, Elyasa Mustafa Elfakia Mohammed, Ziad Alonzi, Rania Abdeen Hussain Abdalla, Azizah Mazi Aldaham, Diem Fayez Aljubab, Naif Muflih Alsharari, Hussain Gadelkarim Ahmed
Open Journal of Obstetrics and Gynecology (OJOG) , 2019, DOI: 10.4236/ojog.2019.93038
Abstract: Background: Continued exposure to sex hormones such as estrogen is a critical risk for subsequent breast cancer. Thus the present study aimed to assess the levels of knowledge towards hormonal related breast cancer risk factors in Qurayyat, Northern Saudi Arabia. Methodology: This descriptive study included 737 Saudi volunteers living in the city of Qurayyat, Northern Saudi Arabia. For females, only those agreeing to participate in the breast self-examination workshop were included, and non-respondents were included in the questionnaire. Results: For the question apropos “Inheritance as a risk factor for BC,” 405/607 (66.7%) females signposted certainly “Yes,” as well as, 70/130 (54%) males signposted certainly “Yes.” The odds ratio (OR) and 95% confidence interval (95% CI) were not statistically significant, but the level of knowledge was relatively higher among females OR (95% CI) = 1.4321 (0.9597 to 2.1370), P = 0.0786. Are early puberty and late menopause risk factors for breast cancer?
Factors Associated with the Prevalence of Breast Cancer Risk: Perception of Northern Saudi Civic  [PDF]
Abdelbaset Mohamed Elasbali, Elyasa Mustafa Elfakia Mohammed, Ziad Alonzi, Haya Ali Atshan Al-Ruwaili, Amierah Hail Alsharari, Abdulrazaq Alshammari, Ali Saad Almansour, Abdulwahab Abdulrahman Alsaman, Hussain Gadelkarim Ahmed
Journal of Cancer Therapy (JCT) , 2019, DOI: 10.4236/jct.2019.103020
Abstract: Background: The incidence of breast cancer is increasing in Saudi Arabia, chiefly in distant provinces with cases assigning advanced stages of the disease. This study aimed to evaluate the level of knowledge towards external exposure related to breast cancer risk factors in Qurayyat, Northern Saudi Arabia. Methodology: This descriptive study included 724 Saudi volunteers living in the city of Qurayyat, Northern Saudi Arabia. For females, only those agreeing to participate in the breast self-examination workshop were included and were further investigated for the presence of breast lumps. Results: In comparison of females vs. males, as for the point Do you know food increases or decreases the risk of BC”, 92 (15%) women stated “Yes (Some prevented BC)” vs. 24 (24%) of the men; 78 (12.5%) women stated “Yes (Some caused BC)” vs. 25 (25%) of the men. Referring to the socket “Overweight or obesity increases the risk of BC”, 290 (46.5%) women stated “Yes” vs. 53 (53%) of the men. As for the inquiry
Studying Heavy Metals in Sediments Layers along Selected Sites on the Lebanese Coast  [PDF]
Journal of Water Resource and Protection (JWARP) , 2010, DOI: 10.4236/jwarp.2010.21006
Abstract: Ensuring the environmental protection of the Lebanese coast requires a continues monitoring system. For this purpose, four heavy metals (Fe, Mn, Cu and Pb in the marine sediments along the Lebanese coast were selected for analysis Sampling was carried out from two sites: Beirut and Batroun. Thus, 1g of dried sample is used for digestion by wet mineralization in order to determine the concentration of the four heavy metals by atomic absorption spectrometry. The results showed that Beirut area is polluted, by Fe and Mn as well as the station Bat 2 of Batroun. For Cu and Pb, Batroun region is more polluted in the superficial layers. The analysis also showed significant difference between the sites except for Cu. A difference between depths and between particles size fractions are observed for all the parameters studied. There is no a significant difference in layer sequence except for the Pb, and neither between the repetitions of the same sample. Results showed that the values of the four metals studied do not exceed the maximum limits at both sites, but they showed increase in comparison with the analyses obtained before July 2006 conflict, which was caused by the release of large quantity of fuel-oil from Jiyeh Power Station.
Applications of Dynamic-Equilibrium Continuous Markov Stochastic Processes to Elements of Survival Analysis  [PDF]
Eugen Mamontov, Ziad Taib
Journal of Applied Mathematics and Physics (JAMP) , 2019, DOI: 10.4236/jamp.2019.71006
Abstract: In this article, we summarize some results on invariant non-homogeneous and dynamic-equilibrium (DE) continuous Markov stochastic processes. Moreover, we discuss a few examples and consider a new application of DE processes to elements of survival analysis. These elements concern the stochastic quadratic-hazard-rate model, for which our work 1) generalizes the reading of its It? stochastic ordinary differential equation (ISODE) for the hazard-rate-driving independent (HRDI) variables, 2) specifies key properties of the hazard-rate function, and in particular, reveals that the baseline value of the HRDI variables is the expectation of the DE solution of the ISODE, 3) suggests practical settings for obtaining multi-dimensional probability densities necessary for consistent and systematic reconstruction of missing data by Gibbs sampling and 4) further develops the corresponding line of modeling. The resulting advantages are emphasized in connection with the framework of clinical trials of chronic obstructive pulmonary disease (COPD) where we propose the use of an endpoint reflecting the narrowing of airways. This endpoint is based on a fairly compact geometric model that quantifies the course of the obstruction, shows how it is associated with the hazard rate, and clarifies why it is life-threatening. The work also suggests a few directions for future research.
On the interlacing property and the Routh-Hurwitz criterion
Ziad Zahreddine
International Journal of Mathematics and Mathematical Sciences , 2003, DOI: 10.1155/s0161171203205287
Abstract: Unlike the Nyquist criterion, root locus, and many other stability criteria, the well-known Routh-Hurwitz criterion is usually introduced as a mechanical algorithm and no attempt is made whatsoever to explain why or how such an algorithm works. It is widely believed that simple derivations of this important criterion are highly requested by the mathematical community. In this paper, we address this problem and provide a simple proof of the Routh-Hurwitz criterion based on two generalizations of an interesting property known in stability theory as the interlacing property. Within the same context, the singularities that may arise in the Routh-Hurwitz criterion are also dealt with.
Matrix measure and application to stability of matrices and interval dynamical systems
Ziad Zahreddine
International Journal of Mathematics and Mathematical Sciences , 2003, DOI: 10.1155/s0161171203202295
Abstract: Using some properties of the matrix measure, we obtain a general condition for the stability of a convex hull of matrices that will be applied to study the stability of interval dynamical systems. Some classical results from stability theory are reproduced and extended. We present a relationship between the matrix measure and the real parts of the eigenvalues that make it possible to obtain stability criteria.
Robust stability of discrete-time systems of difference equations (Removed from Archives)
Ziad Zahreddine
Tamkang Journal of Mathematics , 2007, DOI: 10.5556/j.tkjm.38.2007.205-208
Abstract: This paper deals with the robust stability of discrete-time systems of difference equations. Given the nominal characteristic polynomial of a certain discrete-time system, we determine the maximum allowable perturbation that such a polynomial can undergo while preserving the Schur stability of the corresponding system.
The generalized Routh array and a further simplification of the extended Routh array
Ziad Zahreddine
Tamkang Journal of Mathematics , 2001, DOI: 10.5556/j.tkjm.32.2001.131-136
Abstract: The well-known Routh Array settles the problem of stability of systems of differential equations with rral coefficients. The Extended Routh Array (ERA) is the complex counterpart of the Routh Array and it settles the stability of these systems when the coefficients are complex. Since its construction, the ERA remained more of a theoretical achievement, than a practical tool to test the stability of linear systems. Some attempts were made to overcome the complexity of the ERA. The Modified Extended Routh Array (MERA) was then introduced and it reduced the burden of computations, but still it involved lots of divisions and many operations with complex numbers. In the present work, we use the interlacing property to propose an equivalent criterion to both ERA and MERA, we call the Generalized Routh Array (GRA). The new array has advantages over both ERA and MERA in the sense that neither division algorithm, nor operations of complex numbers are involved. An example is given to illustrate the feasibility of the new test.
The Frontiers in Brain Imaging and Neuromodulation: A New Challenge
Ziad Nahas
Frontiers in Psychiatry , 2010, DOI: 10.3389/fpsyt.2010.00025
$U_q osp(2,2)$ Lattice Models
Ziad Maassarani
Physics , 1994, DOI: 10.1088/0305-4470/28/5/017
Abstract: In this paper I construct lattice models with an underlying $U_q osp(2,2)$ superalgebra symmetry. I find new solutions to the graded Yang-Baxter equation. These {\it trigonometric} $R$-matrices depend on {\it three} continuous parameters, the spectral parameter, the deformation parameter $q$ and the $U(1)$ parameter, $b$, of the superalgebra. It must be emphasized that the parameter $q$ is generic and the parameter $b$ does not correspond to the `nilpotency' parameter of \cite{gs}. The rational limits are given; they also depend on the $U(1)$ parameter and this dependence cannot be rescaled away. I give the Bethe ansatz solution of the lattice models built from some of these $R$-matrices, while for other matrices, due to the particular nature of the representation theory of $osp(2,2)$, I conjecture the result. The parameter $b$ appears as a continuous generalized spin. Finally I briefly discuss the problem of finding the ground state of these models.
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