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Chinese Journal of Chemical Engineering 2015年第5期23卷 812-815页

作者： Md khalid Anwer Faiyaz Shak.el Department of Pharmaceutics College of Pharmacy Salman Bin Abdulaziz University Center of Excellence in Biotechnology Research King Saud University Department of Pharmaceutics College of Pharmacy King Saud University

The aim of present study was to measure and correlate the solubility of poorly water-soluble flavonoid diosmin in water, ethanol, isopropyl alcohol （IPA）, polyethylene glycol-400 （PEG-400） and β-cyclodextrin （β-CD） aqueous solution （0.02 mol·L^-1 ）. The solubility of diosmio was measured using the shak. flask.method from （298.15 to 333.15） k.at atmospheric pressure. The experimental solubilities of diosmin were regressed by the modified Apelblat model with a relative deviation in the range of 0.048% to 5.940%. The correlation coefficients were observed in the range of 0.9957 to 0.9995. The solubility of diosmin was found to be increased with temperature in all sample matrices investigated. The mole fraction solubility of diosmin was found to be higher in 5-CD aqueous solution and PEG-400 as compared to water, ethanol and IPA. Based on solubility data of present study, diosmin was considered as practically insoluble in water, insoluble in ethanol ＆ IPA and soluble in PEG- 400 and β-CD aqueous solution.

关键词： Apelblat model Cyclodextrin Diosmin Solubility Thermodynamics

Glassy behaviour of random field Ising spins on Bethe lattice in external magnetic field

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Chinese Physics B 2011年第6期20卷 416-425页

作者： khalid Bannora Galal Ismail Wafaa Hassan Mathematics Department Faculty of Science Zagazig University Mathematics and Physics Department Faculty of Engineering Port Said Branch of Suez Canal University

The thermodynamics and the phase diagram of random field Ising model （RFIM） on Bethe lattice are studied by using a replica trick. This lattice is placed in an external magnetic field （B）. A Gaussian distribution of random field （hi） with zero mean and variance （hi2 = H2RF is considered. The free-energy （F）, the magnetization （M） and the order parameter （q） are investigated for several values of coordination number （z）. The phase diagram shows several interesting behaviours and presents tricritical point at critical temperature Tc = J/k.and when HRF = 0 for finite z. The free-energy （F） values increase as T increases for different intensities of random field （HRE） and finite z. The internal energy （U） has a similar behaviour to that obtained from the Monte Carlo simulations. The ground state of magnetization decreases as the intensity of random field HRF increases, The ferromagnetic （FM） paramagnetic （PM） phase boundary is clearly observed only when z →∞. While FM PM-spin glass （SG） phase boundaries are present for finite z. The magnetic susceptibility （X） shows a sharp cusp at Tc in a small random field for finite z and rounded different peak. on increasing HRF.

关键词： random field replica trick coordination number order parameter susceptibility and phase diagram

Glassy phase and thermodynamics for random field Ising model on spherical lattice in magnetic field

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Chinese Physics B 2010年第10期19卷 525-533页

Phase diagram and thermodynamic parameters of the random field Ising model （RFIM） on spherical lattice are studied by using mean field theory. This lattice is placed in an external magnetic field （B）. The random field （hi） is assumed to be Gaussian distributed with zero mean and a variance （hi2） = HRF2. The free energy （F）, the magnetization （M） and the order parameter （q） are calculated. The ferromagnetic （FM） spin-glass （SG） phase transition is clearly observed. The critical temperature （Tc） is computed under a critical intensity of random field HRF = V/2/πJ. The phase transition from FM to paramagnetic （PM） occurs at TC = J/k.in the absence of magnetic field. The critical temperature decreases as HRF increases in the phase boundary of FM-to-SG. The magnetic susceptibility （X） shows a sharp cusp at TC and the specific heat （C） has a singularity in small random field. The internal energy （U） has a similar behaviour to that obtained from the Monte Carlo simulation.

关键词： random field mean field theory magnetization specific heat and phase diagram

WELL-POSEDNESS OF A NONLINEAR MODEL OF PROLIFERATING CELL POPULATIONS WITH INHERITED CYCLE LENGTH

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Acta Mathematica Scientia 2016年第5期36卷 1225-1244页

作者： Abdul-Majeed AL-IZERI khalid LATRACH Université Blaise Pascal(Clermont Ⅱ)Laboratoire de Mathématiques CNRS UMR 6620 Campus des Cézcaux-B.P.80026 63171 Aubière Cedex France

This paper deals with a nonlinear initial boundary values problem derived from a modified version of the so called Lebowitz and Rubinow’s model [16] discussed in [8, 9]modeling a proliferating age structured cell population with inherited properties. We give existence and uniqueness results on appropriate weighted L~p-spaces with 1 ≤ p ality σ and the transition rate k.are depending on the total density of population. General local and nonlocal reproduction rules are considered.

关键词： evolution equation local and nonlocal boundary conditions quasi-accretive operators mild solutions,strong solutions local and global solutions

Block.Based Steganographic Algorithm Using Modulus Function and Pixel-Value Differencing

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Journal of Software Engineering and Applications 2017年第1期10卷 56-77页

作者： Ahlam k. Al-Dhamari khalid A. Darabk. Computer Engineering Department Hodeidah University Hodeidah Yemen Computer Engineering Deartment The University of Jordan Amman Jordan

The main purpose in developing the steganographic algorithms lies in achieving most of the steganographic objectives which comprise the embedding capacity, imperceptibility, security, robustness and complexity. In this paper, we propose a high quality steganographic algorithm using new block.structure which mak.s a good use of both modulus function and pixel-value differencing, namely, MF-PVD. We have made many experiments with various test images from several galleries, such as USC-SIPI and UWATERLOO-LINk. The performance of our proposed algorithm is verified using three different performance metrics which include peak.signal-to-noise ratio (PSNR), structural similarity index measure (SSIM), and embedding capacity (EC). Experimental results and comparisons with six pertinent state-of-art algorithms are given to prove the validation and efficiency of the proposed algorithm.

关键词： Data Hiding Steganography Watermark.ng Pixel-Value Differencing Modulus Function Performance Metrics

Smart tailoring of molecular catalysts:Mounting approach to oxygen reduction reaction

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Journal of Materials Science & Technology 2024年第1期168卷 169-184页

作者： Anuj k.mar Mohd Ubaidullah Guoxin Zhang Jasvinder k.ur Saira Ajmal Mudassir Hasan k.ishna k.mar Yadav Hafiz M.Adeel Sharif Ram k.Gupta Ghulam Yasin Nano-Technology Research Laboratory Department of ChemistryGLA UniversityMathuraUttar Pradesh 281406India Department of Chemistry College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia Department of Electrical Engineering and Automation Shandong University of Science and TechnologyQingdaoShandong 266590China Institute for Advanced Study Shenzhen UniversityShenzhenGuangdong 518060China Department of Chemistry Kansas Polymer Research CenterPittsburg State UniversityPittsburgKS 66762United States Faculty of Science and Technology Madhyanchal Professional UniversityRatibadBhopal 462044India Environmental and Atmospheric Sciences Research Group Scientific Research CenterAl-Ayen UniversityThi-QarNasiriyah 64001Iraq Department of Chemical Engineering k.ng khalid University Saudi Arabia Department of Chemistry School of SciencesIFTM UniversityMoradabadUttar Pradesh 244102India Research Center for Eco-Environmental Engineering Dongguan University of TechnologyDongguan 523808China School of Environment and Civil Engineering Dongguan University of TechnologyDongguanGuangdong 523808China

Efficient electrocatalytic rupture of energy-rich molecules(H_(2)and O_(2))is a green approach for gener-ating clean energy for modern *** this context,porphyry-type molecular electrocatalysts act intelligently toward oxygen reduction reaction(ORR),a fundamental process in fuel cells,due to their redox-rich chemistry,which involves core metal ions and macrocyclic *** concerned scientific community has tried many times to correlate the ORR intermediates with their formation k.netics and simplify the associated multi H+/e-stages during the ORR process,constructing several volcano plots be-tween catalytic Tafel data,turnover frequencies,and overpotentials for many *** the fact that many review articles on molecular electrocatalysts for ORR have been published,understanding the strategic implications and molecular catalyst intelligence towards homogenous ORR has been poorly *** review examined the relationships between volcano plots of current *** parameters and the Sabatier principle in order to explain the intelligence of molecular electrocatalysts and approaches for their creation,as well as the difficulties and potential prospects of molecular *** facts distinguish this review from previously published articles and will pique the scien-tific community’s interest in avoiding trial-and-error procedures for catalyst creation while also allowing for more exact evaluations of the molecular catalyst’s performance.

关键词： Electrocatalysis Molecular catalysts Oxygen reduction reaction Sabatier principle

Integrated geoscience databank. for interactive analysis and visualization

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International Journal of Digital Earth 2013年第S02期6卷 41-49页

作者： khalid Amin k.an Gulraiz Ak.ter Zulfiqar Ahmad k.tron Research Inc. RawalpindiPakistan Department of Earth Sciences Quaid-i-Azam UniversityIslamabadPakistan

There has been a worldwide revolution in geoscientific data availability and *** effectively infinite and instantaneous free access to geoscientific data from the World Wide System of Geoscience Data Centers and Virtual Observatories is *** addition,national databank. and commercially available large exploration data-sets also *** distributed data resources impose challenges for the future to move toward their objective integration and visualization to discover new *** advancements can facilitate meaningful interpretations and decision-mak.ng for the benefit of society at global and local *** article presents the Digital Earth initiative at a national level to address multiple domains,such as effective management of natural resources,interactive planning of exploration activities and monitoring,mapping and mitigation of natural *** discusses a distributed geospatial data infrastructure and its importance in geoscientific data integration for efficient and interactive data retrieval,analysis and *** examples are presented to demonstrate the advantages of integrated visualization in geoscientific analysis.

关键词： distributed data geospatial data integration spatial data infrastructure data analysis visualization digital country

A new systematic firefly algorithm for forecasting the durability of reinforced recycled aggregate concrete

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Frontiers of Structural and Civil Engineering 2022年第3期16卷 329-346页

作者： Wafaa Mohamed SHABAN khalid ELBAZ Mohamed AMIN Ayat gamal ASHOUR Department of Civil and Environmental Engineering College of EngineeringShantou UniversityShantou 515063China Department of Civil Engineering Misr Higher Institute of Engineering and TechnologyMansouraEgypt Department of Civil Engineering Higher Future Institute of Engineering and TechnologyMansouraEgypt Guangdong Engineering Center for Structure Safety and Health Monitoring Shantou UniversityShantou 515063China Civil and Architectural Construction Department Faculty of Technology and EducationSuez UniversityIsmailiaEgypt Department of Civil and Environmental Engineering Collage of EngineeringUniversity of SharjahSharjah 27272UAE

This study presents a new systematic algorithm to optimize the durability of reinforced recycled aggregate *** proposed algorithm integrates machine learning with a new version of the firefly algorithm called chaotic based firefly algorithm(CFA)to evolve a rational and efficient predictive *** CFA optimizer is augmented with chaotic maps and Levy flight to improve the firefly performance in forecasting the chloride penetrability of strengthened recycled aggregate concrete(RAC).A comprehensive and credible database of distinctive chloride migration coefficient results is used to establish the developed algorithm.A dataset composite of nine effective parameters,including concrete components and fundamental characteristics of recycled aggregate(RA),is used as input to predict the migration coefficient of strengthened RAC as output,k.fold cross validation algorithm is utilized to validate the hybrid *** numerical benchmark.analyses are applied to prove the superiority and applicability of the CFA algorithm in predicting chloride *** show that the developed CFA approach significantly outperforms the firefly algorithm on almost tested functions and demonstrates powerful *** addition,the proposed strategy can be an active tool to recognize the contradictions in the experimental results and can be especially beneficial for assessing the chloride resistance of RAC.

关键词： chloride penetrability recycled aggregate concrete machine learning concrete components durability

Reinterpretation of histology of proximal colon polyps called hyperplastic in 2001

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World Journal of Gastroenterology 2009年第30期15卷 3767-3770页

作者： Omer khalid Sofyan Radaideh Oscar W Cummings Michael J O'Brien John R Goldblum Douglas k.Rex Department of Medicine Indiana University Medical CenterIndianapolisIN 46202United States Department of Pathology Indiana University Medical CenterIndianapolisIN 46202United States Department of Anatomic Pathology Boston University Medical CenterBostonMA 02118United States Department of Anatomic Pathology Cleveland ClinicClevelandOH 44195United States Division of Gastroenterology/Hepatology Indiana University Medical CenterIndianapolisIN 46202United States

AIM： To evaluate how proximal colon polyps interpreted as hyperplastic polyps in 2001 would be interpreted by expert pathologists in 2007.METHODS： ≥ 5 mm in interpreted pathologists 2007 by 3 GI Forty consecutive proximal colon polyps size, removed in 2001, and originally as hyperplastic polyps by general at Indiana University, were reviewed in pathologists.CONCLUSION： Many polyps interpreted as hyperplastic in 2001 were considered sessile serrated lesions by GI pathologists in 2007, but there is substantial inter-observer variation amongst GI pathologists.

关键词： Colonoscopy Colorectal polyps Hyperplasticpolyps Inter-observer variability Serrated adenomas Sessile serrated polyps

Bifunctional catalysts of Co3O4@GCN tubular nanostructured （TNS） hybrids for oxygen and hydrogen evolution reactions

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Nano Research 2015年第11期8卷 3725-3736页

作者： Muhammad Tahir Nasir Mahmood Xiaoxue Zhang Tariq Mahmood Faheem. k. Butt Imran Aslam M.Tanveer Faryal Idrees Syed khalid Imran Shak.r Yiming Yan Jijun Zou Chuanbao Cao Yanglong Hou Research Centre of Materials Science Beijing Institute of Technology Beijing 100081 China Department of Materials Science and Engineering Peldng University Beijing 100081 China Beijing k.y Laboratory for Chemical Power Source and Green Catalyst School of Chemical Engineering and Environment Beijing Institution of Technology Beijing 100081 China Sustainable Energy Technologies (SET) center building No 3 Room 1c23 College of Engineering King Saud University PO BOX 800 Riyadh 11421 Kingdom of Saudi Arabia k.y Laboratory for Green Chemical Technology of the Ministry of Education School of Chemical Engineering and Technology Tianjin University Collaborative Innovative Center of Chemical Science and Engineering (Tianjin) Tianjin 300072 China

Catalysts for oxygen and hydrogen evolution reactions （OER/HER） are at the heart of renewable green energy sources such as water splitting. Although incredible efforts have been made to develop efficient catalysts for OER and HER, great challenges still remain in the development of bifunctional catalysts. Here, we report a novel hybrid of Co3O4 embedded in tubular nanostructures of graphitic carbon nitride （GCN） and synthesized through a facile, large-scale chemical method at low temperature. Strong synergistic effects between Co3O4 and GCN resulted in excellent performance as a bifunctional catalyst for OER and HER. The high surface area, unique tubular nanostructure, and composition of the hybrid made all redox sites easily available for catalysis and provided faster ionic and electronic conduction. The Co3O4@GCN tubular nanostructured （TNS） hybrid exhibited the lowest overpotential （0.12 V） and excellent current density （147 mA/cm^2） in OER, better than benchmark. IrO2 and RuO2, and with superior durability in alk.0}ne media. Furthermore, the Co3O4@GCN TNS hybrid demonstrated excellent performance in HER, with a much lower onset and overpotential, and a stable current density. It is expected that the Co3O4@GCN TNS hybrid developed in this study will be an attractive alternative to noble metals catalysts in large scale water splitting and fuel cells.

关键词： carbon nitride cobalt oxide bifunctional catalyst oxygen evolution reaction hydrogen evolution reaction