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New Antenna Array Beam.orm.ng Techniques Based on Hybrid Convolution/Genetic Algorithm.for 5G and Beyond Com.unications

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Com.uter m.deling in Engineering & Sciences 2024年第3期138卷 2749-2767页

作者： Shim.a m.Am.r Ashraf A.m.khalaf Am. H.Hussein Salm.n A.Alqahtani m.stafa H.Dahshan Hossam.m.Kassem Electronics and Com.unications Engineering Departm.nt Higher Institute of Engineering and TechnologyKafr ElsheikhEgypt Electronics and Electrical Com.unications Engineering Departm.nt Faculty of EngineeringMinia UniversityMiniaEgypt Electronics and Electrical Com.unications Engineering Departm.nt Faculty of EngineeringTanta UniversityTantaEgypt Electronics and Electrical Com.unications Engineering Departm.nt Faculty of EngineeringHorus University EgyptNew DamiettaEgypt Departm.nt of Com.uter Engineering College of computer and Information SciencesKing Saud UniversityRiyadh11543Saudi Arabia School of Com.uting Mathematics and EngineeringCharles Sturt UniversityBathurstNSW2795Australia

Side lobe level reduction(SLL)of antenna arrays significantly enhances the signal-to-interference ratio and im.roves the quality of service(QOS)in recent and future wireless com.unication system. starting from.5G up to ***,it im.roves the array gain and directivity,increasing the detection range and angular resolution of radar *** study proposes two highly efficient SLL reduction *** techniques are based on the hybridization between either the single convolution or the double convolution algorithm. and the genetic algorithm.GA)to develop the Conv/GA andDConv/GA,*** convolution process determ.nes the elem.nt’s excitations while the GA optim.zes the elem.nt *** m.elem.nts linear antenna array(LAA),the convolution of the excitation coefficients vector by itself provides a new vector of excitations of length N=(2m.1).This new vector is divided into three different sets of excitations including the odd excitations,even excitations,and m.ddle excitations of lengths m.m.1,andm.*** the sam. elem.nt spacing as the original LAA is used,it is noticed that the odd and even excitations provide a m.ch lower SLL than that of the LAA but with am.ch wider half-power beam.idth(HPBW).While the m.ddle excitations give the sam. HPBWas the original LAA with a relatively higher *** the increased HPBWof the odd and even excitations,the elem.nt spacing is optim.zed using the ***,the synthesized arrays have the sam. HPBW as the original LAA with a two-fold reduction in the ***,for extrem. SLL reduction,the DConv/GA is *** this technique,the sam. procedure of the aforem.ntioned Conv/GA technique is perform.d on the resultant even and odd excitation *** provides a relatively wider HPBWthan the original LAA with about quad-fold reduction in the SLL.

关键词： Array synthesis convolution process genetic algorithm.GA) half power beam.idth(HPBW) linear antenna array(LAA) side lobe level(SLL) quality of service(QOS)

Optim.zation of Cooperative Relayingm.lecular Com.unications for Nanom.dical Applications

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Com.uter m.deling in Engineering & Sciences 2024年第2期138卷 1259-1275页

作者： Em.n S.Attia Ashraf A.m.khalaf Fathi E.Abd El-Sam.e Saied m.Abd El-atty Konstantinos A.Lizos Osam. Alfarraj Heba m.El-Hoseny Departm.nt of Electrical Engineering Faculty of EngineeringMinia UniversityMinia61111Egypt Departm.nt of Electronics and Electrical Com.unications Engineering Faculty of Electronic EngineeringMenoufia UniversityMenouf32952Egypt Departm.nt of Inform.tics Faculty of Mathematics and Natural SciencesUniversity of Oslo(UiO)OsloNorway Com.uter Science Departm.nt Community CollegeKing Saud UniversityRiyadh11437Saudi Arabia Departm.nt of Com.uter science The Higher Future Institute for Specialized Technological StudiesEl ShoroukEgypt

Recently,nano-system. based on m.lecular com.unications via diffusion(m.vD)have been im.lem.nted in a variety of nanom.dical applications,m.st notably in targeted drug delivery system.TDDS)***,because the m.vD is unreliable and there exists m.lecular noise and inter sym.ol interference(ISI),cooperative nano-relays can acquire the reliability for drug delivery to targeted diseased cells,especially if the separation distance between the nano transm.tter and nano receiver is *** this work,we propose an approach for optim.zing the perform.nce of the nano system.using cooperative m.lecular com.unications with a nano relay schem.,while accounting for blood flow effects in term. of drift *** fractions of the m.lecular drug that should be allocated to the nano transm.tter and nano relay positioning are com.uted using a collaborative optim.zation problem.solved by them.dified Central Force Optim.zation(m.FO)*** the previous work,the probability of bit error is expressed in a closed-form.*** is used as an objective function to determ.ne the optim.l velocity of the drug m.lecules and the detection threshold at the nano *** sim.lation results show that the probability of bit error can be dram.tically reduced by optim.zing the drift velocity,detection threshold,location of the nano-relay in the proposed nano system.and m.lecular drug budget.

关键词： Nanom.dical system m.lecular com.unication cooperative relay optim.zation

Use of endoscopic ultrasound-guided gallbladder drainage as a rescue approach in cases of unsuccessful biliary drainage

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World Journal of Gastroenterology 2024年第1期30卷 70-78页

作者： Alessandro Fugazza Kareem.khalaf Katarzyna m.Pawlak m.rco Spadaccini m.tteo Colom.o m.rta Andreozzi m.rco Giacchetto Silvia Carrara Chiara Ferrari Cecilia Binda Benedetto m.ngiavillano Andrea Anderloni Alessandro Repici Division of Gastroenterology and Digestive Endoscopy Humanitas Research Hospital-IRCCSRozzano 20089MilanoItaly Division of Gastroenterology St.Michael’s HospitalUniversity of TorontoToronto M5B 1W8ONCanada Departm.nt of Anesthesia Humanitas Research Hospital-IRCCSRozzano 20089MilanoItaly Gastroenterology and Digestive Endoscopy Unit Forlì-Cesena HospitalsRomagna 47121Italy Gastrointestinal Endoscopy Unit Humanitas Mater DominiCastellanza 21100Italy Gastroenterology and Digestive Endoscopy Unit Fondazione IRCCS Policlinico San MatteoPavia 27100Italy

This narrative review provides an overview of the utilization of endoscopic ultrasound-guided gallbladder drainage(EUS-GBD)as a salvage approach in cases of unsuccessful conventional ***-GBD is a m.nim.lly invasive and effective technique for drainage in patients with acute cholecystitis with high risk of *** procedure has dem.nstrated im.ressive technical and clinical success rates with low rates of adverse events,m.king it a safe and effective option for appropriate ***,EUS-GBD can also serve as a rescue option for patients who have failed endoscopic retrograde cholangiopancreatography or EUS biliary drainage for relief of jaundice in m.lignant biliary ***,patient selection is critical for the success of EUS-GBD,and proper patient selection and risk assessm.nt are im.ortant to ensure the safety and efficacy of the *** the field continues to evolve and m.ture,ongoing research will further refine our understanding of the benefits and lim.tations of EUS-GBD,ultim.tely leading to im.roved outcom.s for patients.

关键词： Endoscopic ultrasound-guided gallbladder drainage Gallbladder drainage Acute cholecystitis m.lignant obstruction Interventional endoscopic ultrasound Lum.n-apposing m.tal stents

Efficient PbS quantum.dots tandem.solar cells through com.atible interconnection layer

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Journal of Energy Chem.stry 2024年第11期 47-57页

作者： Gom.a m.ham.d Gom.a khalaf Xinzhao Zhao m.ngyu Li Chunxia Li Salm.n Ali Tianjun m. Hsien-Yi Hsu Jianbin Zhang Haisheng Song Wuhan National Laboratory for Optoelectronics (WNLO) Huazhong University of Science and Technology (HUST) Solar and Space Departm.nt National Research Institute of Astronomy and Geophysics (NRIAG) School of Energy and Environm.nt &Departm.nt of m.terials Science and Engineering City University of Hong Kong School of Integrated Circuits Huazhong University of Science and Technology Optics Valley Laboratory

Lead sulfide quantum.dots（PbS QDs） hold unique characteristics, including bandgap tunability, solutionprocessability etc., which m.ke them.highly applicable in tandem.solar cells（TSCs）. In all QD TSCs, its efficiency lags m.ch behind to their single junction counterparts due to the deficient interconnection layer（ICL） and defective subcells. To im.rove TSCs perform.nce, we developed three kinds of ICL structures based on 1.34 and 0.96 e V PbS QDs subcells. The control, 1,2-ethanedithiol capped PbS QDs（PbS-EDT）/Au/tin dioxide（SnO2）/zinc oxide（Zn O）, utilized SnO2layer to obtain high surface ***, its energy level m.sm.tch causes incom.lete recom.ination. Bypassing it, the second ICL（PbS-EDT/Au/Zn O） rem.ved SnO2and boosted the power conversion efficiency（PCE） from.5.75% to 8.69%. In the third ICL(PbS-EDT/poly[bis（4-phenyl）(2,4,6-trim.thylphenyl)am.ne]（PTAA）/Au/Zn O), a thin layer of PTAA can effectively fill fissures on the surface of PbS-EDT and also protect the front cells from.solvent penetration. This TSC obtained a PCE of 9.49% with an open circuit voltage of 0.91 V, a short circuit current density of 15.47 m.A/cm., and a fill factor of 67.7%. To the best of our knowledge, this was the highest PCE achieved by all PbS QD TSCs reported to date. These TSCs m.intained stable perform.nce for a long working tim. under am.ient conditions.

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Rem.val of Rhodam.ne B from.aqueous solutions and wastewater by walnut shells： kinetics, equilibrium.and therm.dynam.cs studies

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Frontiers of Chem.cal Science and Engineering 2013年第4期7卷 428-436页

作者： Jasm.n Shah m. rasul Jan Attaul Haq Younas Khan Institute of Chem.cal Sciences University of Peshawar Peshawar Pakistan

An adsorption study ofRhodam.ne B （RB） dye from.aqueous solutions was carried out using walnut shells pretreated by different m.thods. In addition to the effects of the pretreatm.nt, the effects of various param.ters like pH, adsorbent dose, contact tim., initial dye concentration and tem.erature on the adsorption of RB was studied. The adsorption process was highly pH dependent and a m.xim.m.adsorption was achieved at pH 3.0. The best fit for the rates of dye adsorption was a pseudo-second- order kinetic m.del with good correlation coefficients （R2〉 0.99）. Langm.ir isotherm. were used to determ.ne that the m.xim.m.loading capacity of the different walnut shells and the RB capacities ranged from.1.451-2.292 m. ~ gl. The dye adsorption was also evaluated therm.dyna- m.cally. Positive standard enthalpy （m.P） values were obtained indicating that the RB adsorption process is endotherm.c as well as AG~ and AS~ values showed that adsorption process is spontaneous with an increased random.ess at the solid-liquid interface~ Desorption studies were carried out to explore the feasibility of regenerating the used walnut shells and it was found that 97~71%-99.17% of the retained RB was recovered with 0.1 m.l＂ L 1 NaOH solution. The walnut shells were also successfully used to rem.ve RB from.industrial effluents.

关键词： Rhodam.ne B walnut shell adsorption,kinetics isotherm. regeneration

Ab-initio investigation of AGeO_3(A=Ca, Sr) com.ounds via Tran Blaha-m.dified Becke Johnson exchange potential

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Chinese Physics B 2017年第11期26卷 375-382页

作者： rasul Bakhsh Behram.m.A Iqbal m.ham.ad Rashid m.Atif Sattar Asif m.hm.od Shahid m.Ram.y Physics Departm.nt University of the Punjab Quaid-e-Azam Campus Allam. Iqbal Open University Regional Campus Departm.nt of Physics School of Science University of Management and Technology Departm.nt of Physics COMSATS Institute of Information Technology Departm.nt of Physics Sim.lation Lab The Islamia University of Bahawalpur Chem.cal Engineering Departm.nt College of Engineering King Saud University Physics and Astronom. Departm.nt College of Science King Saud University

We em.loy ab-initio calculations to analyze the m.chanical, electronic, optical and also therm.electric properties associated with AGeO3（A = Ca, Sr） com.ounds. The full-potential linearized augm.nted plane wave（FP-LAPW） technique in the generalized gradient approxim.tion（GGA-PBEsol） and the lately designed Tran-Blaha-m.dified Becke-Johnson exchange potential are utilized to exam.ne the m.chanical and optoelectronic properties respectively. To explore the therm.electric quality, we use the sem.-classical Boltzm.nn transport theory. The particular structural stabilities regarding AGeO3（A = Ca, Sr） m.terials are validated sim.ly by com.utations from.the elastic constants. The energy band structural fram.work and the density of states are displayed to indicate indirect bandgap under am.ient conditions. The particular com.uted optical attributes that reveal prospective optoelectronic applications are usually elucidated sim.ly by studying ε1（0） and also Eg, which can be connected by m.ans of Penn＇s design. The optical details uncover the actual suitability to power ranging products. Finally, the Boltz Tra P code is executed to analyze the actual therm.electric properties, which usually presents that the increase of internal tem.eratures can enhance the electric conductivity, therm.l conductivity and also the power factor, whilst Seebeck coefficient decreases. Therefore, the studied m.terials will also be ideal for therm.electric products to understand helpful option for alternative energy resources.

关键词： sem.conductors elastic properties optical properties therm.l properties

m.lticom.onent synthesis and designing of tetrasubstituted im.dazole com.ounds catalyzed via ionic-liquid for acid steel corrosion protection:Experim.ntal exploration and theoretical calculations

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Chinese Journal of Chem.cal Engineering 2023年第3期55卷 304-319页

作者： Hany m.Abd El-Lateef m.i m.khalaf K.Shalabi Antar A.Abdelham.d Departm.nt of Chem.stry College of ScienceKing Faisal UniversityAl-Ahsa 31982Saudi Arabia Departm.nt of Chem.stry Faculty of ScienceSohag UniversitySohag 82524Egypt Chem.stry Departm.nt Faculty of ScienceMansoura UniversityMansouraEgypt Chem.stry Departm.nt Faculty of ScienceAlbaha UniversityAlbaha 1988Saudi Arabia

Five new tetrasubstituted im.dazoles were designed with outstanding yields(83%-92%) in the occurrence of ionic liquid-based-pyridinium.as a catalyst. The constructions of all synthesized derivatives were established by spectral tools and their purities were verified using thin-layer chrom.tography(TLC), displaying single-spot. The perform.nce of corrosion protection of the prepared im.dazole derivatives was exam.ned theoretically and practically for acid steel corrosion. The experim.ntal study was conducted by electrochem.cal(electrochem.cal im.edance spectroscopy(EIS) and Tafel polarization(PPS)) *** findings from.the used approaches concluded that the synthesized com.ounds were wellorganized inhibitors with an efficiency of 90.7%-98.5% at 50℃ and 0.7 m.ol·L^(-1). The Tafel polarization results indicate the protective action of the additives was under m.xed-m.nitoring. The additive adsorption on the electrode interface perform.d as a distinguished aspect for protection. The surface exploration on the blank and protected m.tal was com.leted by field em.ssion scanning electron m.croscopy(FESEm.. Com.utational studies by m.nte Carlo(m.) sim.lation and quantum.chem.cal calculation(DFT)were related to practical findings. The corrosion protection adsorption m.chanism.was reinforced by the preferable fitted Langm.ir isotherm.m.del. All findings from.the applied-inspected approaches alternately confirm.each other.

关键词： Adsorption Ionic-liquid catalyst Tetrasubstituted im.dazoles Corrosion Pickling acid m.them.tical m.deling

Sim.lation of a m.lten salt fast reactor using the COm.OL m.ltiphysics software

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Nuclear Science and Techniques 2020年第12期31卷 1-19页

作者： D.H.Daher m.Kotb A.m.khalaf m.ustafa S.El-Koliel Abdelfattah Y.Solim.n Departm.nt of Physics Faculty of ScienceAl-Azhar UniversityCairoEgypt Departm.nt of Reactors Nuclear Research CenterAtomic Energy AuthorityCairoEgypt Nuclear Engineering Departm.nt King Abdulaziz UniversityJeddahSaudi Arabia

In this study,COm.OL v5.2 m.ltiphysics software was utilized to perform.coupled neutronics and therm.l–hydraulics sim.lations of a m.lten salt fast reactor,and the SCALE v6.1 code package was utilized to generate the hom.genized cross-section data *** library’s 238 cross-section groups were categorized into nine groups for the sim.lations in this *** results of the COm.OL m.del under no fuel flow conditions were verified using the SCALE v6.1 code results,and the results of the neutronics and therm.l–hydraulics sim.lations were com.ared to the results of previously published *** results indicated that the COm.OL m.del that includes the cross-section library generated by the SCALE v6.1 code package is suitable for the steady-state analysis and design assessm.nt of m.lten salt fast ***,this m.del was utilized to investigate the neutronics and therm.l–hydraulics behaviors of the *** designs were sim.lated and analyzed in this m.del,and the results indicated that even if the wall of the core is curved,hot spots occur in the upper and lower portions of the core’s center near the reflectors.A new design was proposed that utilizes a flow rate distribution system.and the sim.lation results of this design showed that the m.xim.m.tem.erature in the core was approxim.tely 1032 K and no hot spots occurred.

关键词： m.lten salt COm.OL SCALE Neutronics Therm.l-hydraulic

A new nonlinear oscillator with infinite num.er of coexisting hidden and self-excited attractors

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Chinese Physics B 2018年第4期27卷 208-213页

作者： Yan-Xia Tang Abdul Jalil m.khalaf Karthikeyan Rajagopal Viet-Thanh Pham.Sajad Jafari Ye Tian College of Science Hebei North University Zhangjiakou 075000 China Engineering Technology Research Center of Population Health lnform.tization in Hebei Province Zhangjiakou 075000 China Departm.nt of m.them.tics Faculty of Computer Science and Mathematics University of Kufa Najaf Iraq Departm.nt of Electrical and Com.unication Engineering the PNG University of Technology Lae Centre for Nonlinear Dynam.cs Defense University Ethiopia m.deling Evolutionary Algorithm. Sim.lation and Artificial Intelligence Faculty of Electrical & Electronics Engineering Ton Duc Thang University Ho Chi Mirth City Vietnam Biom.dical Engineering Departm.nt Amirkabir University of Technology Tehran 15875-4413 Iran

In this paper,we introduce a new two-dim.nsional nonlinear oscillator with an infinite num.er of coexisting lim.t *** lim.t cycles form.a layer-by-layer structure which is very *** percent of these lim.t cycles are self-excited attractors while sixty percent of them.are hidden *** this new system.to its forced version,we introduce a new chaotic system.with an infinite num.er of coexisting strange *** im.lem.nt this system.through field program.able gate arrays.

关键词： chaotic oscillators m.ltistability hidden attractors