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Abdelfattah Nilly A.H.,Al-Qahtani A.R.,Qari Sameer H. 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.3
Oryzaephilus surinamensis, a common grain product pest around the world, particularly causing great damage and losses to the date crops available in the storage. It has been traditionally resisted by using organic pesticides despite suspicions of their harmful effects on dates. This study aimed at the evaluation of the usage of ozone gas as an effective pesticide and also focuses on the safety alternatives provided by the respective method as compared to the usage of phosphine as a pesticide. While studying the ozone effects, the O. surinamensis was exposed to the gas for a variety of time scales (2, 4 and 6 h), distinctly for every life stages of the insect such as egg, larva and adults, infested the Phoenix dactylifera L date palm species present in the Siwa oasis. The obtained results showed that the adult insects had high resistance to ozone gas, while the larvae and egg stages were less resistant. The reduction rate of vital insect was 100% in all stages. Start codon analysis of DNA also showed that there are some SCoT primers can be identified and differentiated between the different treatments and control. On the other hand, the percentage of polymorphisms in insects was 50% while in date kernels 25% by six SCoT primers used. This study highlighted higher efficacy and safety regarding the usage of ozone gas in effectively controlling the manifestation of O. Surinamensis and thereby reducing the loss of stored date crops as compared to the phosphine.
Evaluating and improving system reliability of bridge structure using gamma distribution
Abdelfattah Mustafa,Beih S. El-Desouky,Ahmed Taha 한국신뢰성학회 2016 International Journal of Reliability and Applicati Vol.17 No.2
In this paper, we study a system of five components. One of them is a bridge network component. Each of these components is identical and has a failure rate as a function of time. The system components have non-constant failure rates. The given system is improved by using the reduction, hot duplication, and cold duplication methods. We derive the equivalence factors of the bridge structure system to be as another system improved according to these different methods. The β- fractiles are obtained to compare the original system with these improved systems. Finally, we present numerical results to show the difference between these methods.
New generalization families of higher order Daehee numbers and polynomials
Abdelfattah Mustafa,F.M. Abdel Moneim,B.S. El-Desouky 한국전산응용수학회 2022 Journal of applied mathematics & informatics Vol.40 No.3
In this paper, we present a new definition and generalization of the first and second kinds of Daehee numbers and polynomials with the higher order. Some new results for these polynomials and numbers are derived. Furthermore, some interesting special cases of the new generalized Daehee polynomials and numbers of higher order are deduced.
THE LENGTH-BIASED POWERED INVERSE RAYLEIGH DISTRIBUTION WITH APPLICATIONS
MUSTAFA, ABDELFATTAH,KHAN, M.I. The Korean Society for Computational and Applied M 2022 Journal of applied mathematics & informatics Vol.40 No.1-2
This article introduces a new distribution called length-biased powered inverse Rayleigh distribution. Some of its statistical properties are derived. Maximum likelihood procedure is applied to report the point and interval estimations of all model parameters. The proposed distribution is also applied to two real data sets for illustrative purposes.
Baer and Quasi-Baer Modules over Some Classes of Rings
Haily, Abdelfattah,Rahnaou, Hamid Department of Mathematics 2011 Kyungpook mathematical journal Vol.51 No.4
We study Baer and quasi-Baer modules over some classes of rings. We also introduce a new class of modules called AI-modules, in which the kernel of every nonzero endomorphism is contained in a proper direct summand. The main results obtained here are: (1) A module is Baer iff it is an AI-module and has SSIP. (2) For a perfect ring R, the direct sum of Baer modules is Baer iff R is primary decomposable. (3) Every injective R-module is quasi-Baer iff R is a QI-ring.
Bonding values of two contemporary ceramic inlay materials to dentin following simulated aging
Ashraf Abdelfattah Khalil,Khalid Mohamed Abdelaziz 대한치과보철학회 2015 The Journal of Advanced Prosthodontics Vol.7 No.6
PURPOSE. To compare the push-out bond strength of feldspar and zirconia-based ceramic inlays bonded to dentin with different resin cements following simulated aging. MATERIALS AND METHODS. Occlusal cavities in 80 extracted molars were restored in 2 groups (n=40) with CAD/CAM feldspar (Vitablocs Trilux forte) (FP) and zirconia-based (Ceramill Zi) (ZR) ceramic inlays. The fabricated inlays were luted in 2 subgroups (n=20) with either etch-and-bond (RelyX Ultimate Clicker) (EB) or self-adhesive (RelyX Unicem Aplicap) (SA) resin cement. Ten inlays in each subgroup were subjected to 3,500 thermal cycles and 24,000 loading cycles, while the other 10 served as control. Horizontal 3 mm thick specimens were cut out of the restored teeth for push out bond strength testing. Bond strength data were statistically analyzed using 1-way ANOVA and Tukey’s comparisons at α =.05. The mode of ceramic-cement-dentin bond failure for each specimen was also assessed. RESULTS. No statistically significant differences were noticed between FP and ZR bond strength to dentin in all subgroups (ANOVA, P=.05113). No differences were noticed between EB and SA (Tukey’s, P>.05) bonded to either type of ceramics. Both adhesive and mixed modes of bond failure were dominant for non-aged inlays. Simulated aging had no significant effect on bond strength values (Tukey’s, P>.05) of all ceramic-cement combinations althoughthe adhesive mode of bond failure became more common (60-80%) in aged inlays. CONCLUSION. The suggested cement-ceramic combinations offer comparable bonding performance to dentin substrate either before or after simulated aging that seems to have no adverse effect on the achieved bond.
Evaluating and improving system reliability of bridge structure using gamma distribution
Mustaf, Abdelfattah,El-Desouky, Beih S.,Taha, Ahmed The Korean Reliability Society 2016 International Journal of Reliability and Applicati Vol.17 No.2
In this paper, we study a system of five components. One of them is a bridge network component. Each of these components is identical and has a failure rate as a function of time. The system components have non-constant failure rates. The given system is improved by using the reduction, hot duplication, and cold duplication methods. We derive the equivalence factors of the bridge structure system to be as another system improved according to these different methods. The ${\beta}-fractiles$ are obtained to compare the original system with these improved systems. Finally, we present numerical results to show the difference between these methods.
Prevention of Warp Breaks in Jacquard Weaving
Seyam Abdelfattah M.,Lee, Jin-Ho,Hodge George,Oxenham William,Grant Edward The Korean Fiber Society 2007 Fibers and polymers Vol.8 No.1
We developed a system to monitor and locate warp breaks in Jacquard weaving using MEMS accelerometers that are mounted on harness cords. Brief description of the system is provided and system use to prevent warp breaks through the analyses of MEMS signals is demonstrated.
Magnetic resonance angiography in assessment of anomalies of anterior cerebral artery in adults
Noha Abdelfattah Ahmed Madkour 대한해부학회 2023 Anatomy & Cell Biology Vol.56 No.4
Anomalies of anterior cerebral artery (ACA) include aplasia, hypoplasia and variations in number. Magnetic resonance angiography (MRA) is a non-invasive diagnostic technique for assessment of anomalies of cerebral arteries. The aim of the study was to determine the role of MRA in detection of variants of ACA in adults. This study is an observational retrospective study. This study included forty-nine adult cases (28 males and 21 females), mean age 48±12.9 SD with anomalies of ACA in MRA. Magnetic resonance imaging of the brain and MRA were done to all patients. Cerebral MRA and magnetic resonance images were evaluated for frequency and distribution of variants of anterior cerebral arteries, associated aneurysms and infarctions. Odds ratios (ORs) and relative risk were calculated to determine risk of occurrence of cerebral infarctions in patients with anomalies of ACA. Hypoplasia of ACA was the commonest anomaly of ACA (51% of cases). Risk of occurrence of cerebral infarctions was higher in cases with azygos variant (OR, 3.3; P=0.35) than in those with hypoplastic ACA (OR, 2; P=0.58). MRA was highly reliable in identification of different variants of ACA and concomitant vascular changes.
Seyam, Abdelfattah M.,Turner, LaDawnya C.,Banks-Lee, Pamela The Korean Fiber Society 2003 Fibers and polymers Vol.4 No.3
We have shown in Part I [1] of this study that medical needle-stick injuries are causing serious health problems to healthcare personnel and other professionals that require the attention of healthcare and textile researchers to develop new protective systems. Responding to such need, a needle force measurement device that is capable of measuring dynamic forces experienced by medical needles during needle penetration through protective articles was developed and described in part I. This paper reports the results of evaluation of protective woven fabrics from high performance fibers and standard and bifid medical needles using the force measurement system. The woven fabrics varied in cover factor, number of layers, and orientation angle. Standard and bifid needles with different gap widths were used to evaluate the resistance of the fabric to needle penetration.