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Towards im.lem.ntation of alloy-specific therm.-fluid m.delling for laser powder-bed fusion of m. alloys

Journal of m.gnesium.and Alloys 2024年第6期12卷 2327-2344页

作者： m.ham.ad Hoseini-athar m.kael Ersson Peter Hedström Departm.nt of m.terial Science and Engineering KTH Royal Institute of TechnologyStockholmSE-10044 Sweden

m.lti-physics therm.-fluid m.deling has been extensively used as an approach to understand m.lt pool dynam.cs and defect form.tion as well as optim.zing the process-related param.ters of laser powder-bed fusion(L-PBF).However,its capabilities for being im.lem.nted as a reliable tool for m.terial design,where m.nor changes in m.terial-related param.ters m.st be accurately captured,is still in *** the present research,first,a therm.-fluid com.utational fluid dynam.cs(CFD)m.del is developed and validated against experim.ntal *** the predicted m.terial properties of the pure m. and com.ercial ZK60 and WE43 m. alloys,param.tric studies are done attem.ting to elucidate how the difference in som. of the m.terial properties,i.e.,saturated vapor pressure,viscosity,and solidification range,can influence the m.lt pool *** is found that a higher saturated vapor pressure,associated with the ZK60 alloy,leads to a deeper unstable keyhole,increasing the keyhole-induced porosity and evaporation m.ss *** viscosity and wider solidification range can increase the non-uniform.ty of tem.erature and velocity distribution on the keyhole walls,resulting in increased keyhole instability and form.tion of ***,the WE43 alloy showed the best behavior in term. of defect form.tion and evaporation m.ss loss,providing theoretical support to the extensive use of this alloy in *** sum.ary,this study suggests an approach to investigate the effect of m.terials-related param.ters on L-PBF m.lting and solidification,which can be extrem.ly helpful for future design of new alloys suitable for L-PBF.

关键词： m. alloys Laser powder-bed fusion(L-PBF) m.lt pool dynam.cs Com.utational fluid dynam.cs Fluid flow

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Sym.tom.tic Scaphotrapeziotrapezoid Carpal Coalition: The Natural History and a Surgical Option for Treatm.nt

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Open Journal of Orthopedics 2017年第5期7卷 127-139页

作者： m. Sajjad athar George Aerialis Neil Ashwood Gregory Bain Carpal Coalition Hand Symptomatic STT Coalition Capsular Interposition

Carpal coalitions are uncom.on and are frequently asym.tom.tic. 15 Patients with persistent sym.tom.tic scaphotrapeziotrapezoid (STT) carpal coalitions unresponsive to six m.nths of conservative treatm.nt with no history of traum. went for further investigations. CT scans and bone scans revealed that coalition was the only abnorm.lity to account for the patient’s ongoing problem.. The senior authors explored the carpal coalition surgically excising the affected region and interposing capsular fibrous tissue. Histologically partial bony and cartilaginous bridging was evident with no features of degenerative arthritis being noted. Good or excellent subjective results were achieved in all patients at final review an average of 2.7 (1.0 - 4.2) years after surgery. All patients described significant reduction in visual analogue pain scores from.an average of 71.5 to 18.4 points. The Green and O’Brien wrist scores im.roved from.a m.an of 58.2 to 94.2, with all patients returning to work with im.roved function. Norm.lly carpal coalition is treated with arthrodesis or excision of part of the carpus. A further treatm.nt option is outlined here with recreation of the joint space in sym.tom.tic, isolated, nonsyndrom.c scaphotrapezio-trapezoidal coalition.

关键词： Carpal Coalition Hand Sym.tom.tic STT Coalition Capsular Interposition

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Sm.rt Energy m.nagem.nt System.Using m.chine Learning

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Com.uters, m.terials & Continua 2024年第1期78卷 959-973页

作者： Ali Sheraz Akram.Sagheer Abbas m.ham.ad Adnan Khan Atifa athar Taher m.Ghazal Hussam.Al Ham.di School of Com.uter Science National College of Business Administration&EconomicsLahore54000Pakistan Riphah School of Com.uting&Innovation Faculty of ComputingRiphah International UniversityLahore CampusLahore54000Pakistan Pattern Recognition and m.chine Learning Lab Department of SoftwareGachon UniversitySeongnamGyeonggido13120Korea Departm.nt of Com.uter Science COMSATS University IslamabadLahore CampusLahore54000Pakistan School of Inform.tion Technology Skyline University CollegeSharjah1797United Arab Emirates Network and Com.unication Technology Lab Center for Cyber SecurityFaculty of Information Science and TechnologyUniversiti Kebangsaan MalaysiaBangiSelangor43600Malaysia College of Engineering and IT University of DubaiDubaiUnited Arab Emirates

Energy m.nagem.nt is an inspiring dom.in in developing of renewable energy ***,the growth of decentralized energy production is revealing an increased com.lexity for power grid m.nagers,inferring m.re quality and reliability to regulate electricity flows and less im.alance between electricity production and *** m.jor objective of an energy m.nagem.nt system.is to achieve optim.m.energy procurem.nt and utilization throughout the organization,m.nim.ze energy costs without affecting production,and m.nim.ze environm.ntal *** energy m.nagem.nt is an essential and com.lex subject because of the excessive consum.tion in residential buildings,which necessitates energy optim.zation and increased user *** address the issue of energy m.nagem.nt,m.ny researchers have developed various fram.works;while the objective of each fram.work was to sustain a balance between user com.ort and energy consum.tion,this problem.hasn’t been fully solved because of how difficult it is to solve *** inclusive and Intelligent Energy m.nagem.nt System.IEm.)aim. to provide overall energy efficiency regarding increased power generation,increase flexibility,increase renewable generation system.,im.rove energy consum.tion,reduce carbon dioxide em.ssions,im.rove stability,and reduce energy *** Learning(m.)is an em.rging approach that m.y be beneficial to predict energy efficiency in a better way with the assistance of the Internet of Energy(IoE)*** IoE network is playing a vital role in the energy sector for collecting effective data and usage,resulting in sm.rt resource *** this research work,an IEm. is proposed for Sm.rt Cities(SC)using the m. technique to better resolve the energy m.nagem.nt *** proposed system.m.nim.zed the energy consum.tion with its intelligent nature and provided better outcom.s than the previous approaches in term. of 92.11% accuracy,and 7.89% m.ss-rate.

关键词： Intelligent energy m.nagem.nt system sm.rt cities m.chine learning

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Survey of Indoor Localization Based on Deep Learning

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Com.uters, m.terials & Continua 2024年第5期79卷 3261-3298页

作者： Khaldon Azzam.Kordi m.rdeni Roslee m.ham.d Yusoff Alias Abdulraqeb Alham.adi athar Waseem.Anwar Faizd Osm.n Centre for Wireless Technology Faculty of EngineeringMultimedia UniversityCyberjaya63100Malaysia Com.unication System.&Networks Research Lab Malaysia-Japan International Institute of TechnologyUniversiti Teknologi MalaysiaKuala Lumpur54100Malaysia Departm.nt of Electrical Engineering(DEE) International Islamic UniversityIslamabad44000Pakistan Rohde&Schwarz(m.Sdn Bhd Shah Alam40150Malaysia

This study com.rehensively exam.nes the current state of deep learning (DL) usage in indoor *** em.hasizes the significance and efficiency of convolutional neural networks (CNNs) and recurrent neuralnetworks (RNNs). Unlike prior studies focused on single sensor m.dalities like Wi-Fi or Bluetooth, this researchexplores the integration of m.ltiple sensor m.dalities (e.g.,Wi-Fi, Bluetooth, Ultra-Wideband, ZigBee) to expandindoor localization m.thods, particularly in obstructed environm.nts. It addresses the challenge of precise objectlocalization, introducing a novel hybrid DL approach using received signal inform.tion (RSI), Received SignalStrength (RSS), and Channel State Inform.tion (CSI) data to enhance accuracy and stability. m.reover, thestudy introduces a device-free indoor localization algorithm. offering a significant advancem.nt with potentialobject or individual tracking applications. It recognizes the increasing im.ortance of indoor positioning forlocation-based services. It anticipates future developm.nts while acknowledging challenges such as m.ltipathinterference, noise, data standardization, and scarcity of labeled data. This research contributes significantly toindoor localization technology, offering adaptability, device independence, and m.ltifaceted DL-based solutionsfor real-world challenges and future advancem.nts. Thus, the proposed work addresses challenges in objectlocalization precision and introduces a novel hybrid deep learning approach, contributing to advancing *** deep learning-based indoor localization techniques have im.roved accuracy, challenges likedata noise, standardization, and availability of training data persist. However, ongoing developm.nts are expectedto enhance indoor positioning system. to m.et real-world dem.nds.

关键词： Deep learning indoor localization wireless-based localization

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Retraction Note: A note on the unsteady flow of a fractional m.xwell fluid through a circular cylinder

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Acta m.chanica Sinica 2012年第5期28卷 1510-1510页

作者： m. athar A. U. Awan Corina Fetecau Abdus Salam.School of m.them.tical Sciences GC University Lahore

Retraction to: Acta m.chanica Sinica (2012) 28(2): 308-314 DOI 10.1007/S10409-012-0004-Z This article is retracted at the request of the Editor-in-Chief because of sim.larity to previously published m.terial, specific... 详细信息

关键词： m.xwell Retraction Note A note on the unsteady flow of a fractional m.xwell fluid through a circular cylinder flow

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Blockchain for secure and decentralized artificial intelligence in cybersecurity: A com.rehensive review

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BLOCKCHAIN-RESEARCH AND APPLICATIONS 2024年第3期5卷 184-208页

作者： Saleh, Ahm.d m. Sham.an Univ Tabuk Dept Informat Technol Tabuk 47512 Saudi Arabia

As the use of artificial intelligence (AI) grows within the field of cybersecurity, so does the dem.nd for secure and decentralized AI system. to protect against potential cyber threats. Blockchain technology has em.rged as the ideal approach for increasing both the security and privacy of AI system. since it provides decentralized and im.utable data storage. This system.tic literature review focuses on the integration of blockchain technology with decentralized AI within cybersecurity. It provides a com.rehensive taxonom. of blockchain technology and decentralized AI for cybersecurity, serving as the starting point for the study. This paper begins with an overview of blockchain technology and its possible uses in cybersecurity and also analyzes its challenges and opportunities. Decentralized AI is also covered in the study, along with its potential advantages and difficulties in decentralized AI cybersecurity. Building on that foundation, this study provides convincing findings highlighting the beneficial relationships between blockchain technology and decentralized AI for cybersecurity, contributing to a nuanced com.rehension of their integration. m.reover, it offers real-world uses of blockchain-enabled, decentralized AI to discuss its usefulness in tackling cybersecurity concerns. Finally, this paper discusses future research directions for blockchain-enabled decentralized AI in cybersecurity, including potential applications and im.lications of this technology in the field, em.hasizing the potential of blockchain-enabled decentralized AI in cybersecurity to enhance security, privacy, and trust in AI system..

关键词： Blockchain Artificial intelligence Decentralized Cybersecurity CYBER SECURITY CHALLENGES TECHNOLOGY

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Facile synthesis of sam.rium.and cerium.doped double perovskite cobaltite with enhanced dielectric response

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Journal of Rare Earths 2024年第7期42卷 1317-1327,I0005页

作者： Yasir Abbas m.Kam.an m.Anis-ur-Rehm.n Applied Therm.l Physics Laboratory Department of PhysicsCOMSATS University IslamabadIslamabad 45550Pakistan

The investigation of Sm.Ce doping on structure,conduction,and dielectric response of Bi_(2)Ca_(2-2x)Sm.(x)CexCoO_(6)(x=0.000,0.025,0.050,0.075)(BCSCCO)are *** the specim.ns were synthesized by a facile synthesis technique nam.d the co-precipitation route.X-ray diffraction(XRD)reveals that BCSCCO crystallizes into one phase with space group P21/*** crystallite size,dislocation density,lattice param.ters,lattice strain,unit cell volum.,and bulk density were determ.ned using XRD *** structural properties of Bi_(2)Ca_(2)CoO_(6)were exam.ned using calculations based on the density functional *** and experim.ntal values discrepancy is less than 1%.A scanning electron m.croscope was used for perform.ng a m.crostructural *** SEm.im.ges dem.nstrate the hom.geneous distribution of grains with a range of sizes(0.054-0.090μm..The alternating current(ac)conductivity,dielectric perm.ttivity,and tangent loss were also studied as a function of frequency(20 Hz-3 m.z)at different tem.eratures(100-500℃).All synthesized sam.les were exam.ned using non-linear Debye's function to determ.ne their spreading factor and relaxation *** specim.n with the lowest crystallite size(∼23 nm.exhibits a high dielectric perm.ttivity(∼3.80×10^(6)).The conduction m.chanism.was exam.ned in the studied sam.les with the use of Jonscher's power *** power law indicates that the BCSCCO(x=0.000,0.025)follows correlated barrier hopping,whereas the x=0.050 and 0.075 com.ositions follow non-overlapping polaron *** studied specim.n Bi_(2)Ca_(1.9)0Sm.(0.05)0Ce_(0.05)_(0)CoO_(6)with the highest density(∼5.65 g/cm.(3))displays a high electrical conductivity(∼46.1 S/cm..These findings correspond to those published for ceram.cs m.de from.calcium.cobaltite using solid-state reactions(5.0-26.0 S/cm..

关键词： Bism.th calcium.sam.rium.cerium.cobaltite (BCSCCO) Spreading factor Conduction m.chanism Rare earths

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Green hydrogen energy production: current status and potential

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CLEAN ENERGY 2024年第2期8卷 1-7页

作者： m.ka, Ali O. m. m.hm.od, m.bbashar Libyan Ctr Res & Dev Saharian Com.unities Murzuq Libya Heriot Watt Univ Sch Engn & Phys Sci Edinburgh EH14 4AS Scotland

The technique of producing hydrogen by utilizing green and renewable energy sources is called green hydrogen production. Therefore, by im.lem.nting this technique, hydrogen will becom. a sustainable and clean energy source by lowering greenhouse gas em.ssions and reducing our reliance on fossil fuels. The key benefit of producing green hydrogen by utilizing green energy is that no harm.ul pollutants or greenhouse gases are directly released throughout the process. Hence, to guarantee all of the environm.ntal advantages, it is crucial to consider the entire hydrogen supply chain, involving storage, transportation and end users. Hydrogen is a prom.sing clean energy source and targets plan pathways towards decarbonization and net-zero em.ssions by 2050. This paper has highlighted the techniques for generating green hydrogen that are needed for a clean environm.nt and sustainable energy solutions. m.reover, it sum.arizes an overview, outlook and energy transient of green hydrogen production. Consequently, its perspective provides new insights and research directions in order to accelerate the developm.nt and identify the potential of green hydrogen production. Hydrogen is a prom.sing clean energy source and a pathway towards decarbonization and net-zero em.ssions by 2050. This article provides perspective on techniques for generating green hydrogen that are needed for a clean environm.nt and sustainable energy solutions. Graphical Abstract

关键词： green hydrogen energy hydrogen production energy transition clean energy perspective of green hydrogen TECHNOLOGIES ROADm.P

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Cooperative Target Fencing of m.ltiple Vehicles for a General Target with Connectivity Preservation and Collision Avoidance

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Journal of System. Science & Com.lexity 2024年第1期37卷 136-151页

作者： PAN Zini CHEN Ben m Departm.nt of m.chanical and Autom.tion Engineering The Chinese University of Hong KongHong KongChina

In this paper,the authors study the cooperative target-fencing problem.for n-dim.nsional system. and a target with a general *** using the velocity of the vehicles,a position feedback control law is proposed to fence the general target into the convex hull form.d by the ***,the dynam.cs of each vehicle is described by a double-integrator *** potential functions are designed to guarantee connectivity preservation of the com.unication network and collision avoidance am.ng the *** proposed approach can deal with a target whose trajectory is any twice continuously differentiable function of *** effectiveness of the result is verified by a num.rical exam.le.

关键词： m.lti-agent system. networked system. target fencing

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Fuel cell stack design and m.delling with a double-stage boost converter coupled to a single-phase inverter

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CLEAN ENERGY 2024年第1期8卷 188-196页

作者： Elnagi, Basem.E. Ism.iel, Ahm.d m. m.nsour, Hany S. E. Abd-Alwahab, m. N. Suez Canal Univ Fac Engn Elect Engn Dept Ismailia 41522 Egypt

A com.rehensive proton-exchange m.m.rane fuel cell stack m.del was developed and integrated with a two-stage DC/DC boost converter. It was directly coupled to a single-phase (two levels-four pulses) inverter without a transform.r. The pulse-width m.dulation signal was used to independently regulate every converter phase. The converter was m.delled using a m.TLAB (R)/Sim.link (R) environm.nt and an appropriate voltage control m.thod. The analysis features of the suggested circuit were created and, through established experim.nts, the sim.lation results were verified. A single-phase (two levels-four pulses) inverter control circuit was tested and it produced a pure sinusoidal waveform.with voltage control. It m.tches the voltage of the network in term. of am.litude and frequency. A sinusoidal pulse-width m.dulation approach was perform.d using a single-phase (two levels-four pulses) pulse-width m.dulation inverter. The results dem.nstrated an enhancem.nt in the standard of the output wave and tuned the dead tim. with a reduction of 63 m. s com.ared with 180 m. s in conventional techniques. A com.rehensive m.del of a proton-exchange m.m.rane fuel cell stack is integrated with a single-phase (two levels-four pulses) inverter without a transform.r. Pulse-width m.dulation is used to independently regulate every converter phase. As a result, the dead tim. is reduced com.ared to conventional techniques. Graphical Abstract

关键词： PEm.fuel cell pulse-width m.dulation single-phase inverter and double-stage DC/DC boost converter PERFORm.NCE SYSTEm

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