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Frontiers in Energy 2024年第3期18卷 291-307页

作者： Hongxia LI khaja wahab ahmed Mohamed A.ABDELSALAM Michael FOWLER Xiao-Yu WU Technology Innovation Institute Masdar CityAbu Dhabi 9639United Arab Emirates Department of Chemical Engineering University of WaterlooWaterlooON N2L 3G1Canada Department of Mechanical and Nuclear Engineering Khalifa University of Science and TechnologyAbu Dhabi 127788United Arab Emirates Department of Mechanical and Mechatronics Engineering University of WaterlooWaterlooON N2L 3G1Canada

Solar-driven hydrogen production from seawater attracts great interest for its emerging role in decarbonizing global energy consumption. Given the complexity of natural seawater content, photocatalytic vapor splitting offers a low-cost and safe solution, but with a very low solar-to-hydrogen conversion efficiency. With a focus on cutting-edge photothermal–photocatalytic device design and system integration, the recent research advances on vapor splitting from seawater, as well as industrial implementations in the past decades were reviewed. In addition, the design strategies of the key processes were reviewed, including vapor temperature and pressure control during solar thermal vapor generation from seawater, capillary-fed vaporization with salt repellent, and direct photocatalytic vapor splitting for hydrogen production. Moreover, the existing laboratory-scale and industrial-scale systems, and the integration principles and remaining challenges in the future seawater-to-hydrogen technology were discussed.

关键词： seawater hydrogen photocatalytic vapor splitting solar-driven

Removal of arsenite by reductive precipitation in dithionite solution activated by UV light

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Journal of Environmental Sciences 2018年第12期30卷 168-176页

作者： Bahngmi Jung Aya Safan Yuhang Duan Vishakha Kaushik Bill Batchelor ahmed Abdel-wahab Chemical Engineering Program Texas A&M University at Qatar Education City Zachry Department of Civil Engineering Texas A&M University College Station

This study investigates the removal of arsenite（As（III）） from water using dithionite activated by UV light. This work evaluated the removal kinetics of As（III） under UV light irradiation as affected by dithionite dose and light intensity, and characterized the nature of the precipitated solids using XPS and SEM-EDS. Photolysis of dithionite was observed by measuring dithionite concentration using UV absorbance at 315 nm. This study also investigated the effect of UV light path length on soluble As concentrations to understand resolubilization mechanisms. Total soluble As concentrations were observed to decrease with reaction time due to reduction of arsenite to form solids having a yellow-orange *** removal mechanism was found to be reductive precipitation that formed solids of elemental arsenic or arsenic sulfide. However, these solids were observed to resolubilize at later times after dithionite had been consumed. Resolubilization of As was prevented and additional As removal was obtained by frequent dosing of dithionite throughout the experiment. As（III） removal is attributed to photolysis of dithionite by UV light and production of reactive radicals that reduce As（III） and convert it to solid forms.

关键词： Arsenite Sodium dithionite Reductive precipitation and Ultraviolet light

DETECTION OF ELECTROMAGNETIC INCLUSIONS USING TOPOLOGICAL SENSITIVITY

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Journal of Computational Mathematics 2017年第5期35卷 642-671页

作者： Abdul wahab Tasawar Abbas Naveed ahmed Qazi Muhammad Zaigham Zia Bio Imaging and Signal Processing Lab. Department of Bio and Brain Engineering Korea Advanced Institute of Science and Technology 305-701 Daejeon Korea Department of Mathematics and Statistics Faculty of Basic and Applied Sciences International Islamic University 44000 Islamabad Pakistan Weierstrass Institute for Applied Analysis and Stochastics Leibniz Institute in Forschungsverbund Berlin e. V. (WIAS) Mohrenstr. 39 10117 Berlin Germany Department of Mathematics COMSATS Institute of Information Technology Islamabad Campus Park Road Chak Shahzad 44000 Islamabad Pakistan

In this article, a topological sensitivity framework for far-field detection of a diamet- rically small electromagnetic inclusion is established. The cases of single and multiple measurements of the electric far-field scattering amplitude at a fixed frequency are tak- en into account. The performance of the algorithm is analyzed theoretically in terms of its resolution and sensitivity for locating an inclusion. The stability of the framework with respect to measurement and medium noises is discussed. Moreover, the quantitative results for signal-to-noise ratio are presented. A few numerical results are presented to illustrate the detection capabilities of the proposed framework with single and multiple measurements.

关键词： Electromagnetic imaging Topological derivative Localization Resolution analysis Stability analysis Medium noise Measurement noise.

Enhanced Heap-Based Optimizer Algorithm for Solving Team Formation Problem

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Computers, Materials & Continua 2022年第12期73卷 5245-5268页

作者： Nashwa Nageh ahmed Elshamy Abdel wahab Said Hassan Mostafa Sami Mustafa Abdul Salam Faculty of Science Suez Canal UniversityIsmailiaEgypt Faculty of Computers and Artificial Intelligence Helwan UniversityHelwanEgypt Faculty of Computers and Artificial Intelligence Benha UniversityBenha 13518Egypt Faculty of Computer Studies Arab Open UniversityCairoEgypt

Team Formation(TF)is considered one of the most significant problems in computer science and *** is defined as forming the best team of experts in a social network to complete a task with least *** real-world problems,such as task assignment,vehicle routing,nurse scheduling,resource allocation,and airline crew scheduling,are based on the TF *** has been shown to be a Nondeterministic Polynomial time(NP)problem,and high-dimensional problem with several local optima that can be solved using efficient approximation *** paper proposes two improved swarm-based algorithms for solving team formation *** first algorithm,entitled Hybrid Heap-Based Optimizer with Simulated Annealing Algorithm(HBOSA),uses a single crossover operator to improve the performance of a standard heap-based optimizer(HBO)*** also employs the simulated annealing(SA)approach to improve model convergence and avoid local minima *** second algorithm is the Chaotic Heap-based Optimizer Algorithm(CHBO).CHBO aids in the discovery of new solutions in the search space by directing particles to different regions of the search *** HBO’s optimization process,a logistic chaotic map is *** performance of the two proposed algorithms(HBOSA)and(CHBO)is evaluated using thirteen benchmark functions and tested in solving the TF problem with varying number of experts and ***,the proposed algorithms were compared to well-known optimization algorithms such as the Heap-Based Optimizer(HBO),Developed Simulated Annealing(DSA),Particle SwarmOptimization(PSO),GreyWolfOptimization(GWO),and Genetic Algorithm(GA).Finally,the proposed algorithms were applied to a real-world benchmark dataset known as the Internet Movie Database(IMDB).The simulation results revealed that the proposed algorithms outperformed the compared algorithms in terms of efficiency and performance,with fast convergence to the global minimum.

关键词： Team formation problem optimization problem genetic algorithm heap-based optimizer simulated annealing hybridization method chaotic local search

Oversampling Method Based on Gaussian Distribution and K-Means Clustering

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Computers, Materials & Continua 2021年第10期69卷 451-469页

作者： Masoud Muhammed Hassan Adel Sabry Eesa ahmed Jameel Mohammed wahab Kh.Arabo Department of Computer Science University of ZakhoDuhok42001Kurdistan RegionIraq Department of Information Technology Duhok Polytechnic UniversityDuhok42001Kurdistan RegionIraq

Learning from imbalanced data is one of the greatest challenging problems in binary classification,and this problem has gained more importance in recent *** the class distribution is imbalanced,classical machine learning algorithms tend to move strongly towards the majority class and disregard the ***,the accuracy may be high,but the model cannot recognize data instances in the minority class to classify them,leading to many *** methods have been proposed in the literature to handle the imbalance problem,but most are complicated and tend to simulate unnecessary *** this paper,we propose a simple oversampling method based on Multivariate Gaussian distribution and K-means clustering,called *** new method aims to avoid generating noise and control imbalances between and within *** experiments have been carried out with six classifiers and four oversampling *** results on different imbalanced datasets show that the proposed GK-Means outperforms other oversampling methods and improves classification performance as measured by F1-score and Accuracy.

关键词： Class imbalance oversampling gaussian multivariate distribution k-means clustering

Rescue effects of aqueous seed extracts of Foeniculum vulgare and Carum carvi against cadmium-induced hepatic, renal and gonadal damage in female albino rats

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Asian Pacific Journal of Tropical Medicine 2017年第12期10卷 1123-1133页

作者： ahmed Abdel-wahab Abdel-Razik Hashem Abdel-Razik Rabie Lotfy Abdel Aziz Physiology Department Faculty of Veterinary MedicineMinia University61519 El-MiniaEgypt Histology Department Faculty of Veterinary MedicineBeni-Suef University62512 Beni-SuefEgypt Department of Theriogenology Faculty of Veterinary MedicineBeni-Suef University62512 Beni-SuefEgypt

Objective: To investigate the protective effects of aqueous seed extracts of fennel"Foeniculum vulgare"(FVE) and caraway "Carum carvi"(CCE) on liver, kidney and reproductive organs in female rats against cadmium chloride(CC) ***: A total of 36 adult female rats were divided into six groups, six in each *** group(fed normal diet), CC-treated group(50 mg CC/kg diet), CCE-treated group(150 mg CCE/kg diet), CCE + CC group, FVE(150 mg/kg diet) and FVE + CC. One month later, all rats were sacrificed and all samples were collected at proestrus ***: The toxic effects of CC were confirmed biochemically by significant increase of serum concentration of liver enzymes(P < 0.05), and creatinine(P < 0.001). Moreover,CC increased significantly the serum level of malondialdehyde(MDA) and decreased the total antioxidant capacity(TAC)(P < 0.001). In addition, serum concentrations of estrogen, progesterone, follicle-stimulating hormone(FSH) and luteinizing hormone(LH)were significantly decreased(P < 0.01). Histopathologically, CC-treated group revealed marked pathological changes in renal, hepatic, ovarian and uterine tissues. All toxic findings observed in liver and kidney with CC treatment were found to be ameliorated markedly after co-treatments with FVE or CCE. Furthermore, co-treatment of FVE with CC improved significantly all studied reproductive parameters(P < 0.01).Conclusions: Both FVE and CCE could be used as efficient treatments for liver and kidney against CC intoxication. Moreover, FVE could be utilized as a potent treatment to protect and improve female fertility from cadmium intoxication.

关键词： Cadmium Carum carvi Foeniculum vulgare Liver Kidney Fertility

Relationship between heart girth, serum progesterone and superovulation response ofdonor Holstein cows

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Asian pacific Journal of Reproduction 2019年第3期8卷 118-123页

作者： Abdel-Tawab AYKhalil ahmed Abdel-wahab Rabie LAbdel Aziz Department of Theriogenology Faculty of Veterinary MedicineBeni-Suef UniversityBeni-SuefEgypt Physiology Department Faculty of Veterinary MedicineMinia UniversityEl-MiniaEgypt

Objective: To determine effects of variations of heart girth, volume trait on embryo quality grade, and to explore the relationship between heart girth and circulating progesterone and correlations of circulating progesterone with embryo quality grade in superstimulated donor Holstein cows. Methods: Nineteen cows were subjected to a standard superstimulation protocol using follicle stimulating hormone. Blood samples were collected before superovulation, at insemination and at collection of embryos for progesterone analysis. Embryo quality grades were compared between high and low heart girth donors. Moreover, Pearson's correlations were determined between heart girth, progesterone and embryo quality. Results: Variation of heart girth was not associated with significant differences in embryo quality grade between high and low heart girth donor cows (P>0.05). However, we observed a significantly higher percentage of the third-grade embryo (24.09%) in low heart girth donors compared to 9.64% in high heart girth donors. Moreover, the percentage of the transferable embryo was numerically higher and that of the degenerated embryo was numerically lower in low heart girth cows. Donor cows with low response to superovulation (total structures ≤ 3) expressed numerically higher mean heart girth, compared to donors with high (total structures>15) and medium (total structures = 4-15) superovulation. Heart girth and body weight of donor cows were moderately correlated (r=0.45, P<0.05), but none was correlated with circulating progesterone at different sampling times except for a moderate correlation between body weight and progesterone at embryo collection (r=0.54, P=0.02). Circulating progesterone before superovulation was moderately correlated to the second-grade embryo (r=0.46, P<0.05) and to the third grade (r=0.52, P<0.05) embryo. Conclusions: Volume traits heart girth may influence the response of Holstein cows to superovulation;however, future studies with a higher number

关键词： Heart girth Superovulation Embryo quality Progesterone Holstein cow

Effects of electrochemical synthetic conditions on surface property and photocatalytic performance of copper and iron-mixed p-type oxide electrodes

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Journal of Materials Science & Technology 2018年第9期34卷 1503-1510页

作者： Sun Hee Yoon Dong Suk Han Unseock Kang Seung Yo Choi Wubulikasimu Yiming ahmed Abdel-wahab Hyunwoong Park Chemical Engineering Program Texas A&M University at Qatar School of Energy Engineering Kyungpook National University Department of Mechanical Engineering Texas A&M University at Qatar

Earth-abundant copper and iron-mixed oxide（CuO/CuFeO_2; CFO） film electrodes are synthesized using an electrochemical deposition（ED） technique at two different ED potentials（-0.36 and-0.66 V vs saturated calomel electrode（SCE）; denoted as ED-1 and ED-2, respectively）. Then, their surface morphologies are compared, and the photo（electro）catalytic activities for the reduction of Cr（VI） are examined in aqueous solutions at pH 7 under simulated sunlight（AM 1.5 G; 100 mW cm（-2））. The degree of the electrical potential applied to the ED process significantly affects the thickness of the synthesized electrode film and the intensity ratio of the diffraction peaks of CuO（111） and CuFeO_2（012）. A 200 μm thick ED-2 sample with a distinct stacking of CuO on CuFeO_2 exhibits a larger broadband absorption spectrum than the 50-μm thick ED-1 with less separate stacking. Furthermore, the ED-2 sample has a higher intensity ratio of the diffraction peaks of CuO（111） and CuFe02（012） than ED-1. As-synthesized ED-2 samples produce larger photocurrents, leading to faster Cr（VI） reduction on the surface under given potential bias（-0.5 V vs SCE）or bias-free conditions. The energy levels（i.e., flatband potential） for the two samples are almost the same（only 10 mV difference）, presumably supposing that the enhanced photoactivity of the ED-2 sample for Cr（VI） reduction is due to the facilitated charge transfer. The time-resolved photoluminescence emission spectra analysis reveal that the lifetime（r） of the charge carriers in the ED-1 sample is 0.103 ns, which decreases to 0.0876 ns in the ED-2. The ED-2 sample synthesized at a high negative potential is expected to contribute greatly to the application of other solar-to-fuel energy conversion fields as a highly efficient electrode material.

关键词： Artificial photosynthesis Solar fuel Delafossites Morphology Charge transfer

Hepatoprotective activity of Sapindus mukorossi and Rheum emodi extracts: In vitro and in vivo studies

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World Journal of Gastroenterology 2008年第16期14卷 2566-2571页

作者： Mohammed Ibrahim Mohammed Nane khaja Anjum Aara Aleem ahmed Khan Mohammed Aejaz Habeeb Yalavarthy Prameela Devi Mangamoori Lakshmi Narasu Chitoor Mohammed Habibullah Centre for Liver Research and Diagnostics Deccan college of Medical Sciences and Allied Hospitals Kanchanbagh Nizam Institute of Pharmacy Deshmukhi pochampally (Mandal) Near Ramoji Film City Centre for Biotechnology Jawaharlal Nehru Technological University Kukatpally

AIM: To study the hepatoprotective capacity of Sapindus mukorossi (S. mukorossi) and Rheum emodi (R. emodi) extracts in CCl4 treated male rats. METHODS: The dried powder of S. mukorossi and R. emodi was extracted successively with petroleum ether, benzene, chloroform, and ethanol and concentrated in vacuum. Primary rat hepatocyte monolayer cultures were used for in vitro studies. In vivo, the hepatoprotective capacity of the extract of the fruit pericarp of S. mukorossi and the rhizomes of R. emodi was analyzed in liver injured CCl4-treated male rats. RESULTS: In vitro: primary hepatocytes monolayer cultures were treated with CCl4 and extracts of S. mukorossi & R. emodi. A protective activity could be demonstrated in the CCl4 damaged primary monolayer culture. In vivo : extracts of the fruit pericarp of S. mukorossi (2.5 mg/mL) and rhizomes of R. emodi (3.0 mg/mL) were found to have protective properties in rats with CCl4 induced liver damage as judged from serum marker enzyme activities. CONCLUSION: The extracts of S. mukorossi and R. emodi do have a protective capacity both in vitro on primary hepatocytes cultures and in in vivo in a rat model of CCl4 mediated liver injury.

关键词： Hepatoprotective activity Sapindus mukorossr Rheum emodi

Outcomes of pancreaticoduodenectomy in elderly patients

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Hepatobiliary & Pancreatic Diseases International 2016年第4期15卷 419-427页

作者： Ayman El Nakeeb Ehab Atef Ehab El Hanafy Ali Salem Waleed Askar Helmy Ezzat ahmed Shehta Mohamed Abdel wahab Gastroenterology Surgical Center Mansoura University

BACKGROUND： Although the mortality and morbidity of pancreaticoduodenectomy（PD） have improved significantly over the past years, the concerns for elderly patients undergoing PD are still present. Furthermore, the frequency of PD is increasing because of the increasing proportion of elderly patients and the increasing incidence of periampullary tumors. This study aimed to analyze the outcomes of PD in elderly ***： We studied all patients who had undergone PD in our center between January 1995 and February 2015. The patients were divided into three groups based on age： group I（patients aged 〈60 years）, group II（those aged 60 to 69 years） and group III（those aged ≥70 years）. The primary outcome was the rate of total postoperative complications. Secondary endpoint included total operative time, hospital mortality, length of postoperative hospital stay, delayed gastric emptying, re-exploration, and survival ***： A total of 828 patients who had undergone PD for resection of periampullary tumor were included in this study. There were 579（69.9%） patients in group I, 201（24.3%） in group II, and 48（5.8%） in group III. The overall incidence of complications was higher in elderly patients（25.9% in group I, 36.8% in group II, and 37.5% in group III; P=0.006）. There were more patients complicated with delayed gastric emptying in group II compared with the other two groups. There was no significant difference in the incidence of postoperative pancreatic fistula, biliary leakage, pancreatitis, pulmonary complications and hospital ***： PD can be performed safely in selected elderly patients. Advanced age alone should not be a contraindication for PD. The outcome of elderly patients who have undergone PD is similar to that of younger patients, and the increased rate of complications is due to the presence of associated comorbidities.

关键词： pancreaticoduodenectomy elderly pancreatic fistula delayed gastric emptying