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Belal Almomani,김태용,장윤석 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.4
The importance of ensuring the inherent safety and security has been more emphasized in recent yearsto demonstrate the integrity of nuclear facilities under external human-induced events (e.g. aircraftcrashes). This work suggests a simulation methodology to effectively evaluate the impact of a commercialaircraft engine onto a dry storage facility. A full-scale engine model was developed and verified by Rieraforce-time history analysis. A reinforced concrete (RC) structure of a dry storage facility was alsodeveloped and material behavior of concrete was incorporated using three constitutive models namely:Continuous Surface Cap, Winfrith, and Karagozian & Case for comparison. Strain-based erosion limits forconcrete were suitably defined and the local responses were then compared and analyzed with empiricalformulas according to variations in impact velocity. The proposed methodology reasonably predictedsuch local damage modes of RC structure from the engine missile, and the analysis results agreed wellwith the calculations of empirical formulas. This research is expected to be helpful in reviewing the drystorage facility design and in the probabilistic risk assessment considering diverse impact scenarios.
Belal, Mahmoud Helmy,Yassin, Abdulaziz Korean Academy of Periodontology 2014 Journal of Periodontal & Implant Science Vol.44 No.5
Purpose: Dentin hypersensitivity is a potential threat to oral health. Laser irradiation may provide reliable and reproducible treatment but remains controversial. The present study aimed to evaluate the effects of $CO_2$ or erbium-doped yttrium aluminium garnet (Er:YAG) laser therapy, and to assess mineral content. Methods: Eighteen human single-rooted teeth affected with advanced periodontitis were obtained. Buccal and lingual surfaces were planed to form 36 specimens. Ethylenediaminetetraacetic acid gel (24%) was applied to remove the smear layer and simulate hypersensitive teeth. The experimental groups were: group 1, control (no irradiation); group 2, $CO_2$ laser (repetitive pulsed mode, 2 W, $2.7J/cm^2$); and group 3, Er:YAG laser (slight contact mode, 40 mJ/pulse and 10 Hz). To evaluate dentinal tubule occlusion, six specimens per group (2-mm thickness) were prepared and observed using scanning electron microscopy (SEM) for calculation of the occlusion percentage. To evaluate the mineral content, six specimens per group (0.6-mm thickness) were used, and then the levels of Ca, K, Mg, Na, and P were measured by inductively coupled plasma-atomic emission spectrometry. In addition, the surface temperature of the specimens during laser irradiation was analyzed by a thermograph. Results: The SEM photomicrographs indicated melted areas around exposed dentinal tubules and a significantly greater percentage of tubular occlusion in the $CO_2$ and Er:YAG laser groups than the control, and in the Er:YAG group than the $CO_2$ laser group. In addition, no significant differences were noted among the experimental groups for the mineral elements analyzed. The $CO_2$ laser group showed an evident thermal effect compared to the Er:YAG group. Conclusions: $CO_2$ and Er:YAG laser are effective in treating dentin hypersensitivity and reducing its symptoms. However, the Er:YAG laser has a more significant effect; thus, it may constitute a useful conditioning item. Furthermore, neither $CO_2$ nor Er:YAG lasers affected the compositional structure of the mineral content.
Belal Almomani,장동찬,이상훈,강현국 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.2
Using a probabilistic safety assessment, a risk evaluation framework for an aircraft crashinto an interim spent fuel storage facility is presented. Damage evaluation of a detailedgeneric cask model in a simplified building structure under an aircraft impact is discussedthrough a numerical structural analysis and an analytical fragility assessment. Sequences ofthe impact scenario are shown in a developed event tree, with uncertainties considered inthe impact analysis and failure probabilities calculated. To evaluate the influence of parametersrelevant to design safety, risks are estimated for three specification levels of caskand storage facility structures. The proposed assessment procedure includes the determinationof the loading parameters, reference impact scenario, structural response analyses offacility walls, cask containment, and fuel assemblies, and a radiological consequenceanalysis with doseerisk estimation. The risk results for the proposed scenario in this studyare expected to be small relative to those of design basis accidents for best-estimated conservativevalues. The importance of this framework is seen in its flexibility to evaluate thecapability of the facility to withstand an aircraft impact and in its ability to anticipate potentialrealistic risks; the framework also provides insight into epistemic uncertainty in theavailable data and into the sensitivity of the design parameters for future research.
Recurrent Belly Dancer’s Dyskinesia with Pregnancy
Belal Aldabbour,Islam E’Leimat,Kefah Alhayek,Aiman Momani 대한파킨슨병및이상운동질환학회 2019 Journal Of Movement Disorders Vol.12 No.2
Belly dancer’s dyskinesia (BDD) is a rare disorder characterized by visible, involuntary, slow, semicontinuous, undulating abdominal wall movements. BDD typically affects the abdominal muscles, but can also involve both the hemidiaphragm and perineal muscles. BDD in pregnancy is even rarer, as a literature review yielded only 3 reported cases
Belal B. E. A.,El Kenawy M. A.,Omar Asmaa S. M. 한국원예학회 2022 Horticulture, Environment, and Biotechnology Vol.63 No.6
The color of 'Crimson Seedless' berries is a major constraint in expanding marketing and export potential. The target of this investigation is to enhance the color and quality of 'Crimson Seedless' by using brassinolide (BL) and girdling treatments, individually and in combination, as an alternative to ethephon over two consecutive seasons. The obtained results revealed that the combined treatment BL at 2.0 mg/L and girdling recorded the highest significant yield values (17.78 ± 0.29 and 18.26 ± 0.23 kg/vine) in both seasons, respectively, in contrast to ethephon and girdling treatments which had no significant influence. Besides, BL 2.0 mg/L + girdling presented high levels of physicochemical characteristics of clusters and berries compared to the control. Concerning berry color assessment, ethepon followed by BL at 2.0 mg/L + girdling recorded the highest significant improvement in the red color, as indicated by Color Index of Red Grapes and visual assessment, and had similar and elevated levels of anthocyanin content. On the other hand, flavonoids (3.46 ± 0.03 and 3.66 ± 0.02 mg/100 g FW), and antioxidant capacity (2.37 ± 0.02 and 2.43 ± 0.06 IC 50 ) were obviously increased with BL 2.0 mg/L + girdling, with a slight decrease than ethephon application. As for phenylalanine ammonia-lyase activity, the data show that it increased by ethephon (7.91 ± 0.02 and 8.01 ± 0.02 U mg −1 protein) and BL 2.0 mg/L + girdling (7.77 ± 0.04 and 7.79 ± 0.07 U mg −1 protein), compared to the control (3.69 ± 0.02 and 3.80 ± 0.01 U mg −1 protein) in both seasons, respectively. In terms of polyphenol oxidase activity, the increase in PPO was closely associated with PAL. Moreover, BL 2.0 mg/L + girdling was the most effective treatment for increasing dormant season parameters in both seasons, while ethephon spraying had no influence. All these confirmed that the combined treatment BL 2.0 mg/L + girdling exhibited a synergistic effect in improving the color and quality of 'Crimson Seedless'.