Landslide susceptibility mapping at Al-Hasher Area, Jizan (Saudi Arabia) using GIS-based frequency ratio and index of entropy models

Ahmed M. Youssef,Mohamed Al-Kathery,Biswajeet Pradhan 한국지질과학협의회 2015 Geosciences Journal Vol.19 No.1

Mountain areas in the southern western corner ofthe Kingdom of Saudi Arabia frequently suffer from various typesof landslides due to rain storms and anthropogenic activities. Toresolve the problem related to landslides, landslide susceptibilitymap is important as a quick and safe mitigation measure and tohelp making strategic planning by identifying the most vulnerableareas. This paper summarizes findings of landslide susceptibilityanalysis at Al-Hasher area, Jizan, KSA, using two statistical models:frequency ratio and index of entropy models with the aid ofGIS tools and remote sensing data. The landslide locations (inventorymap) were identified in the study area using historical records,interpretation of high-resolution satellite images that include Geo-Eye in 2.5 m and Quickbird in 0.6m resolution, topographic mapsof 1:10,000 scale, and multiple field investigations. A total of 207landslides (80% out of 257 detected landslides) were randomlyselected for model training, and the remaining 50 landslides (19%)were used for the model validation. Ten landslide conditioning factorsincluding slope angle, slope-aspect, altitude, curvature, lithology,distance to lineaments, normalized difference vegetation index (NDVI),distance to roads, precipitation, and distance to streams, were extractedfrom spatial database. Using these conditioning factors and landslidelocations, landslide susceptibility and weights of each factorwere analyzed by using frequency ratio and index of entropy models. Our findings showed that the existing landslides of high and very highsusceptibility classes cover nearly 80.4% and 79.1% of the susceptibilitymaps produced by frequency ratio and index of entropy modelsrespectively. For verification, receiver operating characteristic (ROC)curves were drawn and the areas under the curve (AUC) were calculatedfor success and prediction rates. For success rate the resultsrevealed that for the index of entropy model (AUC = 77.9%) is slightlylower than frequency ratio model (AUC = 78.8%). For the predictionrate, it was found that the index of entropy model (AUC = 74.9%)is slightly lower than the frequency ratio model (AUC = 76.7%). The landslide susceptibility maps produced from this study couldhelp decision makers, planners, engineers, and urban areas developersto make suitable decisions.

Effect of chronic lead intoxication on the distribution and elimination of amoxicillin in goats

Ahmed M. Soliman,Ehab A. Abu-Basha,Salah A. H. Youssef,Aziza M. Amer,Patricia A. Murphy,Catherine C. Hauck,Ronette Gehring,Walter H. Hsu 대한수의학회 2013 Journal of Veterinary Science Vol.14 No.4

A study of amoxicillin pharmacokinetics was conducted in healthy goats and goats with chronic lead intoxication. The intoxicated goats had increased serum concentrations of liver enzymes (alanine aminotransferase and γ-glutamyl transferase),blood urea nitrogen, and reactivated δ-aminolevulinic acid dehydratase compared to the controls. Following intravenous amoxicillin (10 mg/kg bw) in control and lead-intoxicated goats,elimination half-lives were 4.14 and 1.26 h, respectively. The volumes of distribution based on the terminal phase were 1.19and 0.38 L/kg, respectively, and those at steady-state were 0.54and 0.18 L/kg, respectively. After intramuscular (IM)amoxicillin (10 mg/kg bw) in lead-intoxicated goats and control animals, the absorption, distribution, and elimination of the drug were more rapid in lead-intoxicated goats than the controls. Peak serum concentrations of 21.89 and 12.19 μg/mL were achieved at 1 h and 2 h, respectively, in lead-intoxicated and control goats. Amoxicillin bioavailability in the lead-intoxicated goats decreased 20% compared to the controls. After amoxicillin, more of the drug was excreted in the urine from lead-intoxicated goats than the controls. Our results suggested that lead intoxication in goats increases the rate of amoxicillin absorption after IM administration and distribution and elimination. Thus, lead intoxication may impair the therapeutic effectiveness of amoxicillin.

Water Vapor Adsorption and Hydrogen Peroxide Decomposition on Date Pit Carbonization Products

Youssef, A.M.,El-Nabarawy, Th.,Ahmed, S.A. Sayed,Rashwan, W.E. Korean Carbon Society 2005 Carbon Letters Vol.6 No.4

Carbonization products C1, C2, C3, C4 and C5 were prepared by the carbonization of date pit in limited air, at 500, 600, 700, 800 and $1000^{\circ}C$, respectively. C1-V-600, C3-V-600, C1-V-1000 and C3-V-1000 were prepared by thermal treatment of C1 and C3 under vacuum at 600 and $1000^{\circ}C$. The textural properties were determined from nitrogen adsorption at 77 K and from carbon dioxide adsorption at 298 K. The surface pH, the FTIR spectra and the acid and base neutralization capacities of some carbons were investigated. The amounts of surface oxygen were determined by out-gassing the carbon-oxygen groups on the surface as $CO_2$ and CO. The adsorption of water vapor at 308 K on C1, C2, C3 and C4 was measured and the decomposition of $H_2O_2$ at 308 K was also investigated on C1, C2, C3, C4 and C5. The surface area and the total pore volume decreased with the rise of the carbonization temperature from 500 to $1000^{\circ}C$. The adsorption of water vapor is independent on the textural properties, while it is related to the amount of acidic carbon-oxygen groups on the surface. The catalytic activity of $H_2O_2$ decomposition does not depend on the textural properties, but directly related to the amount of basic carbon-oxygen complexes out-gassed as CO, at high temperatures.

ON THE RECURSIVE SEQUENCE $x_{n+1}=\frac{a+bx_{n-1}}{A+Bx^k_n}$

Ahmed, A. M.,El-Owaidy, H. M.,Hamza, Alaa E.,Youssef, A. M. The Korean Society for Computational and Applied M 2009 Journal of applied mathematics & informatics Vol.27 No.1

In this paper, we investigate the global behavior of the difference equation $x_{n+1}\;=\;\frac{a+bx_{n-1}}{A+Bx^k_n}$, n=0,1,..., where a,b,$B\;{\in}\;[0,\infty)$ and A, $k\;{\in}\;(0,\infty)$ with non-negative initial conditions.

Traumatic cerebrospinal fluid leakage following septorhinoplasty

Youssef, Ahmed,Ahmed, Shahzad,Ibrahim, Ahmed Aly,Daniel, Mulvihill,Abdelfattah, Hisham M.,Morsi, Haitham Korean Society of Plastic and Reconstructive Surge 2018 Archives of Plastic Surgery Vol.45 No.4

Septoplasty/septorhinoplasty is a common ear, nose and throat procedure offered for those patients with deviated septum who are suffering from nasal obstruction and functional or cosmetic problems. Although it is a basic and simple procedure, it could lead to catastrophic complications including major skull base injuries which result in cerebrospinal fluid (CSF) leaks. We describe two different cases of traumatic CSF leaks following septoplasty/septorhinoplasty at two different sites. The first patient suffered a CSF leak following septoplasty and presented to Alexandria University Hospital. The leak was still active at presentation and identified as coming from a defect in the roof of the sphenoid sinus and was repaired surgically. The second patient presented 4 days after her cosmetic septorhinoplasty with a CSF leak and significant pneumocephalus. She was managed conservatively. Understanding the anatomical variations of the paranasal sinuses and implementing proper surgical techniques are crucial in preventing intracranial complications when performing either septoplasty or septorhinoplasty. A good quality computed tomography of the nose and paranasal sinuses is a valuable investigation to avoid major complications especially CSF leaks following either procedure.

ON THE RECURSIVE SEQUENCE <수식>

A. M. Ahmed,H. M. El-Owaidy,Alaa E. Hamza,A. M. Youssef 한국전산응용수학회 2009 Journal of applied mathematics & informatics Vol.27 No.1

In this paper, we investigate the global behavior of the differ- ence equation <수식>, n = 0, 1, ..., where a, b,B ∈ [0,∞) and A, k ∈ (0,∞) with non-negative initial condi- tions. In this paper, we investigate the global behavior of the differ- ence equation <수식>, n = 0, 1, ..., where a, b,B ∈ [0,∞) and A, k ∈ (0,∞) with non-negative initial condi- tions.

Adsorption of cationic dye (MB) and anionic dye (AG 25) by physically and chemically activated carbons developed from rice husk

A.M. Youssef,A.I. Ahmed,U.A. El-Bana 한국탄소학회 2012 Carbon Letters Vol.13 No.2

Dye removal from waste water via adsorption by activated carbons (ACs) developed from agricultural wastes represents an ideal alternative to other expensive treatment options. Physical and chemical ACs were prepared from rice husks. The textural properties of the ACs were characterized by Brunauer-Emmett-Teller-N2 adsorption and scanning electron microscopy. The chemistry of the carbon surface was investigated by Fourier transform infrared spectroscopy, base and acid neutralization capacities, pH of the active carbon slurry, and pHpzc. The adsorption capacities of the ACs for the basic dye (methylene blue) and acid dye (acid green 25) were determined using parameters such as contact time, pH, and temperature. NaOH-ACs showed the highest surface area and total pore volume, whereas steam-ACs showed the lowest ones.

Protective Effect of Portulaca oleracea Extract Against Lipopolysaccharide-Induced Neuroinflammation, Memory Decline, and Oxidative Stress in Mice: Potential Role of miR-146a and miR-let 7

Rasha M. Hussein,Ahmed M. Youssef,Mousa K. Magharbeh,Saed M. Al-Dalaen,Nariman A. Al-Jawabri,Taymaa N. Al-Nawaiseh,Abdullah Al-Jwanieh,Fakhir S. Al-Ani 한국식품영양과학회 2022 Journal of medicinal food Vol.25 No.8

Neuroinflammation is an adaptive immune response to the central nervous system (CNS) injury induced by infection or toxins. MicroRNAs (miRs) showed critical roles in neuroinflammation as either proinflammatory or anti-inflammatory molecules. Interestingly, Portulaca oleracea (purslane) is an edible plant capable of ameliorating several diseases, including headache, burns, and diabetes; however, its effect on the neuroinflammation-associated miRs was not previously investigated. This study aimed to investigate the effect of aqueous purslane extract on the neuroinflammation induced by lipopolysaccharide (LPS) in mice and to identify its effect on animal cognition, oxidative stress, and expressions of miR-146a and miR-let 7. Adult mice were divided into the following groups: Normal group, LPS group, and Purslane+LPS group. Novel target recognition test, brain histopathology, and measurement of oxidative stress and inflammatory markers were performed. The results showed that LPS group exhibited significant decline in the cognitive memory, brain histopathological injury and a decrease in the number of intact neurons compared to the normal group. Furthermore, the LPS group showed a significant increase in malondialdehyde concentration, whereas superoxide dismutase and catalase activities were decreased. The LPS group also showed an increase in the inflammatory markers tumor necrosis factor-α and nuclear factor kappa B and downregulation of miR-146a and miR-let 7 expressions in the brain cells compared to the normal group, P value <.05. Interestingly, all these changes were reversed by administration of the aqueous purslane extract. In conclusion, the aqueous purslane extract protected from LPS-induced neuroinflammation and memory decline in mice through antioxidant and anti-inflammatory effect where upregulation of miR-146a and miR-1et 7 expressions was involved.

Bidirectional Chain Replication for Higher Throughput Provision

( Almetwally M. Mostafa ),( Ahmed E. Youssef ),( Yazeed Ali Aljarbua ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.2

Provision of higher throughput without sacrificing consistency guarantees in replication systems is a critical problem. In this paper, we propose a novel approach called Bidirectional Chain Replication (BCR) to improve throughput in traditional Chain Replication (CR) through better utilization of computing and communication resources of the chain. Unlike CR where the whole replicated data store is treated as a single unit, in BCR the replicated shared data at each server in the chain is split into two disjoint Logical Partitions (LP1, LP2). This forms two chains running concurrently on the same hardware in two opposite directions; the first chain (CR1) exclusively manipulates data objects in LP1, while the second chain (CR2) exclusively manipulates data objects in LP2, therefore, conflict is avoided and concurrency is guaranteed. The simultaneous employment of these two chains results in better utilization of hardware in the sense that the two chains can evenly share the workload, hence, throughput can be improved without sacrificing consistency. Experimental results showed an improvement of approximately 85% in throughput of BCR over CR.

Water Vapor Adsorption and Hydrogen Peroxide Decomposition on Date Pit Carbonization Products

A.M. Youssef,Th. El-Nabarawy,S.A. Sayed Ahmed,W.E. Rashwan 한국탄소학회 2005 Carbon Letters Vol.6 No.4

Carbonization products C1, C2, C3, C4 and C5 were prepared by the carbonization of date pit in limited air, at 500, 600, 700, 800 and 1000℃, respectively. C1-V-600, C3-V-600, C1-V-1000 and C3-V-1000 were prepared by thermal treatment of C1 and C3 under vacuum at 600 and 1000℃. The textural properties were determined from nitrogen adsorption at 77 K and from carbon dioxide adsorption at 298 K. The surface pH, the FTIR spectra and the acid and base neutralization capacities of some carbons were investigated. The amounts of surface oxygen were determined by out-gassing the carbon-oxygen groups on the surface as CO2 and CO. The adsorption of water vapor at 308 K on C1, C2, C3 and C4 was measured and the decomposition of H2O2 at 308 K was also investigated on C1, C2, C3, C4 and C5. The surface area and the total pore volume decreased with the rise of the carbonization temperature from 500 to 1000℃. The adsorption of water vapor is independent on the textural properties, while it is related to the amount of acidic carbon-oxygen groups on the surface. The catalytic activity of H2O2 decomposition does not depend on the textural properties, but directly related to the amount of basic carbon-oxygen complexes out-gassed as CO, at high temperatures.