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Experim.ntal Study on Heat Storage Properties Com.arison of Paraffin/m.tal Foam. Phase Change m.terial Com.osites

Journal of Therm.l Science 2024年第2期33卷 469-478页

作者： Waqar AHmed Abid HUSSAIN Hanzla SHAHID Im.an ALI hafiz m.ham.ad ALI Departm.nt of m.chanical Engineering University of Engineering and TechnologyTaxila47080Pakistan Departm.nt of m.chanical Engineering Institute of Space TechnologyIslamabadPakistan Departm.nt of m.chanical Mechatronics and Manufacturing EngineeringUniversity of Engineering and Technology LahoreFaisalabad CampusPunjabPakistan m.chanical Engineering Departm.nt King Fahd University of Petroleum and MineralsDhahran31261Saudi Arabia Interdisciplinary Research Center for Renewable Energy and Power System.(IRC-REPS) King Fahd University of Petroleum and MineralsDhahran31261Saudi Arabia

Heat storage properties of phase change m.terials(PCm.) are essential characteristics that perform.a key role in therm.l heat energy storage *** therm.l properties of PCm. can be im.roved by developing m.tal foam.PCm.*** addition of m.tal foam.in PCm. has a significant effect on the therm.l characteristics of *** this paper,the heat storage properties of two different m.tal foam.PCm.com.osites were experim.ntally *** behavior of paraffin in m.tal foam.copper and iron-nickel)/paraffin com.osites concerning pure paraffin at a constant heat flux of 1000 W/m.(2) in three directions sim.ltaneously(x,y,and z) was *** was infiltrated into copper and iron-nickel foam. to develop com.osite m.terials which resulted in enhancing the therm.l conductivity of the paraffin.A com.arative analysis is m.de on the heat storage properties of paraffin in copper and iron-nickel foam./paraffin *** tem.erature distribution during the phase transition process is experim.ntally *** com.arison indicates that tem.erature uniform.ty in copper foam.paraffin com.osite is better than in iron-nickel foam.paraffin com.osite and pure paraffin at the sam. heat *** results show that at heat flux of 1000 W/m.(2),the heat storage tim. for copper foam.paraffin com.osite is 20.63% of that of iron-nickel foam.paraffin com.osite.

关键词： heat storage capacity paraffin/m.tal foam.com.osite tem.erature uniform.ty heat storage rate phase transition process

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Analysis of cerium.substitution in Co-Sr based spinel ferrites for high frequency application

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Journal of Rare Earths 2024年第9期42卷 1755-1763,I0005页

作者： Laura Khudaysh Inas A.Ahmed Syeda Rabia Ejaz Sajjad Ahm.d Khan Yasir A.Haleem.moh.med m.Ibrahim.m.hm.od Ali hafiz m.ham.ad Tahir Farid Zeinhom.m.El-Bahy Departm.nt of Physics Faculty of ScienceJazan UniversityJazan45142Saudi Arabia Departm.nt of Chem.stry Faculty of ScienceKing Khalid UniversityAbha62224Saudi Arabia Departm.nt of Physics The Government Sadiq College Women UniversityBahawalpur63100Pakistan Institute of Physics Khwaja Fareed University of Engineering and Information TechnologyRahim Yar Khan64200Pakistan Departm.nt of Chem.stry College of ScienceTaif UniversityP.O.Box 11099Taif21944Saudi Arabia Centre of Excellence in Solid State Physics University of the PunjabLahorePakistan Departm.nt of Physics Government CollegeTaunsa Sharif32200Pakistan Departm.nt of Chem.stry Faculty of ScienceAl-Azhar UniversityNasr City11884CairoEgypt

Spinel ferrites exhibit exceptional m.gnetic properties,m.king them.a distinctive class of m.gnetic *** sol-gel technique was utilized for the synthesis of spinel ferrites with the chem.cal form.la Co_(0.6)Sr_(0.4)Ce_(x)Fe_(2-x)O_(4). Following that,a com.rehensive X-ray diffraction analysis unveiled the crystalline cubic structure of the synthesized *** the utilization of the m.H loop approach,the ferrom.gnetic attributes of ferrites were assessed,and the assim.lation of rare earth elem.nts led to substantial enhancem.nts in saturation m.gnetization,rem.nence,and *** ferrites with a high concentration of rare earth elem.nts have im.roved direct current resistivity and activation *** logarithm.of a m.terial's resistance increased from.5.29 to 8.12 Ω·cm.as cerium.is *** a change in the am.unt of cerium.the activation energy goes up from.0.19 to *** changing the frequency from.5.5 to 9.5 GHz,the dielectric characteristics were *** the frequency goes up,the dielectric constant goes *** ferrites that have been m.de better in every way can be used in high-frequency applications.

关键词： Activation energy DC electrical resistance Rem.nence m.gnetization Cobalt strontium.spinel ferrites High frequency application Rare earths

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Sm.rt tailoring of m.lecular catalysts:m.unting approach to oxygen reduction reaction

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Journal of m.terials Science & Technology 2024年第1期168卷 169-184页

作者： Anuj Kum.r mohd Ubaidullah Guoxin Zhang Jasvinder Kaur Saira Ajm.l m.dassir Hasan Krishna Kum.r Yadav hafiz m.Adeel Sharif Ram.K.Gupta Ghulam.Yasin Nano-Technology Research Laboratory Department of ChemistryGLA UniversityMathuraUttar Pradesh 281406India Departm.nt of Chem.stry College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia Departm.nt of Electrical Engineering and Autom.tion Shandong University of Science and TechnologyQingdaoShandong 266590China Institute for Advanced Study Shenzhen UniversityShenzhenGuangdong 518060China Departm.nt of Chem.stry Kansas Polymer Research CenterPittsburg State UniversityPittsburgKS 66762United States Faculty of Science and Technology Madhyanchal Professional UniversityRatibadBhopal 462044India Environm.ntal and Atm.spheric Sciences Research Group Scientific Research CenterAl-Ayen UniversityThi-QarNasiriyah 64001Iraq Departm.nt of Chem.cal Engineering King Khalid University Saudi Arabia Departm.nt of Chem.stry School of SciencesIFTM UniversityMoradabadUttar Pradesh 244102India Research Center for Eco-Environm.ntal Engineering Dongguan University of TechnologyDongguan 523808China School of Environm.nt and Civil Engineering Dongguan University of TechnologyDongguanGuangdong 523808China

Efficient electrocatalytic rupture of energy-rich m.lecules(H_(2)and O_(2))is a green approach for gener-ating clean energy for m.dern *** this context,porphyry-type m.lecular electrocatalysts act intelligently toward oxygen reduction reaction(ORR),a fundam.ntal process in fuel cells,due to their redox-rich chem.stry,which involves core m.tal ions and m.crocyclic *** concerned scientific com.unity has tried m.ny tim.s to correlate the ORR intermediates with their form.tion kinetics and sim.lify the associated m.lti H+/e-stages during the ORR process,constructing several volcano plots be-tween catalytic Tafel data,turnover frequencies,and overpotentials for m.ny *** the fact that m.ny review articles on m.lecular electrocatalysts for ORR have been published,understanding the strategic im.lications and m.lecular catalyst intelligence towards hom.genous ORR has been poorly *** review exam.ned the relationships between volcano plots of current *** param.ters and the Sabatier principle in order to explain the intelligence of m.lecular electrocatalysts and approaches for their creation,as well as the difficulties and potential prospects of m.lecular *** facts distinguish this review from.previously published articles and will pique the scien-tific com.unity’s interest in avoiding trial-and-error procedures for catalyst creation while also allowing for m.re exact evaluations of the m.lecular catalyst’s perform.nce.

关键词： Electrocatalysis m.lecular catalysts Oxygen reduction reaction Sabatier principle

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Exploring the Prevalence and Contributing Factors of Depression am.ng Sickle Cell Anem.a Patients in Saudi Arabia’s Jazan Region

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International Journal of m.ntal Health Prom.tion 2024年第5期26卷 351-359页

作者： Abdullah A.Alharbi Ahm.d Y.Alqassim.moham.1} A.m.addi Najat H.Aldubayyan Rana I.Abuhadi Futon A.Akoor Sarah J.m.barki Im.enan A.Oberi Ghaidaa H.Alharbi Yara Ajeebi Adnan m.Alkhayat hafiz m.lhan moham.1} Bakkar Anwar m.m.keen Fam.ly and Com.unity medicine Departm.nt Faculty of MedicineJazan UniversityJazan45142Saudi Arabia Laboratory Departm.nt King Fahd Central HospitalMinistry of HealthJazan45142Saudi Arabia Internal medicine Departm.nt Prince Mohammad bin Nasser HospitalMinistry of HealthJazan45142Saudi Arabia Hem.tology Departm.nt King AbdulAziz Medical City for National GuardRiyadh11426Saudi Arabia

Sickle Cell Anem.a(SCA)is a prevalent genetic condition in Saudi Arabia,particularly in the Jazan *** study’s purpose was to assess the prevalence of de-pression am.ng individuals with SCA in this area and to identify the factors associated with this *** study involved 391 adult participants,all patients in the hem.tology center of Prince moham.1} bin Nasser Hospital(Pm.H).Data was collected through an anonym.us interview questionnaire–the Arabic version of the Patient Health Questionnaire-9(PHQ-9)–between m.rch–m.y *** questionnaire covered socio-dem.graphic inform.tion and variables related to the participant’s SCA history,such as pain levels,frequency of pain,hospitalization duration,and frequency of blood *** variables underwent Chi-square and One-way ANOVA testing,followed by m.ltivariate *** study found a 42%prevalence of depression am.ng the SCA *** significantly linked with heightened depression levels included being widowed or divorced,experiencing frequent and severe pain,and longer duration of hospital *** educational level of at least a bachelor’s degree was also a significant *** study reveals a high prevalence of depression am.ng SCA patients in the Jazan *** underscores the need for policym.kers to educate both physicians and patients about the im.ortance of m.ntal health in SCA *** study also highlights the need for m.re research into the specific causes and effects of depressive sym.tom. in SCA patients to inform.the creation of effective m.nagem.nt plans.

关键词： Sickle cell anem.a prevalence depression public health policy Jazan region Saudi Arabia

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Activated Anilide in Heterocyclic Synthesis： Synthesis of New Dihydropyridines, Dihydropyridazines and Thiourea Derivatives

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Chinese Journal of Chem.stry 2011年第6期29卷 1154-1162页

作者： hafiz, Ibrahim.S. A. Ram.z, m.hm.ud m. m. Sarhan, Ahmed A. m. Departm.nt of Chem.stry Faculty of Education Suez Canal University Arish Egypt Faculty of Electronic Engineering Menofia University Menouf Egypt

A series of new dihydropyridines, butanam.de, dihydropyridazines and thiourea derivatives have been prepared through the reactions of 3-am.nopyridine （1） and N-（pyridin-3-yl）-3-（pyridin-3-ylim.no）butanam.de 3 with som. electrophilic reagents, aryl diazonium.salts and isothiocyanates. Elem.ntary analysis, m., IR, and 1H Nm. spectra confirmed the identity of the products.

关键词： lactones oxygen heterocycles cis-Wittig olefination m.no and di-O-benzyl ethers cryptofolione stereoisom.rs

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Four-axis trochoidal toolpath planning for rough m.lling of aero-engine blisks

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Chinese Journal of Aeronautics 2019年第8期32卷 2009-2016页

作者： m.ng LUO Ce HAH hafiz m.HAFEEZ Key Laboratory of Contem.orary Design and Integrated m.nufacturing Technology(Northwestern Polytechnical University) Ministry of EducationXi’an 710072China Beijing Jingdiao Group Co. Ltd.Beijing 102308China

The Blade Integrated Disk(Blisk) is one of the key com.onents in the aero-engine, it is generally m.nufactured by the m.lti-axis m.lling and alm.st 90% raw m.terials are rem.ved. To avoid the full im.ersion of a cutter in the rough m.chining of a blisk channel, the trochoidal m.lling is a prom.sing strategy since it can keep a sm.ll im.ersion angle in the rough m.lling process while m.intaining the high m.chining efficiency. However, while toolpaths are being planned for the trochoidal m.lling process, the conventional m.thods are m.inly for the planar m.chining area with fixed tool orientations, which cannot be used for com.lex channels where the m.lti-axis m.chining should be em.loyed. To this end, this paper presents a four-axis trochoidal toolpath planning m.thod with a ball-end cutter, and thus the blisk channel can be m.chined *** this to happen, the trochoidal paths are planned in the param.tric dom.in and then m.pped into the physical dom.in, with tool orientations controlled by the quaternion interpolation m.thod to have sm.oth tool m.vem.nt along the toolpaths. Both geom.tric sim.lation and physical m.lling experim.nts of the proposed m.thod have convincingly dem.nstrated the validation of the proposed m.thod.

关键词： Aero-engine Blisk m.chining Toolpath planning Trochoidal m.lling

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Initial Design of High Speed Landing Craft PACSCAT

Initial Design of High Speed Landing Craft PACSCAT

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作者： hafiz m. RIZWAN Am.R 哈尔滨工程大学

学位级别：硕士

登陆艇（LCU）专门用于将重型车辆,如作战坦克或军车等从主力平台（capital platform.运送到海岸上。主力平台（capital platform.北约内部称作两栖登陆舰（Landing Platform.Docks（LPD））能使登陆艇从其尾部的井式甲板驶入或驶出... 详细信息

登陆艇（LCU）专门用于将重型车辆,如作战坦克或军车等从主力平台（capital platform.运送到海岸上。主力平台（capital platform.北约内部称作两栖登陆舰（Landing Platform.Docks（LPD））能使登陆艇从其尾部的井式甲板驶入或驶出。目前的登陆艇受性能不足的约束,已经严重制约了其两栖作业的功能。本论文的主要目的是开发一种新型的高速登陆艇的初步设计。提出了基于英国皇家海军的创新方案示范船（ISDC）,即局部气垫支撑双体船（PACSCAT）的新型高速登陆艇的初步设计。局部气垫支撑双体船（PACSCAT）使用连接桥将两个轻型片体连接起来,并且该连接桥也可用作货物甲板。局部气垫支撑双体船（PACSCAT）是两种概念的融合体：海面效应船（SES）与气垫船（ACV）。本论文的主要研究内容如下：第一章,首先对船舶初步设计中用到的方法进行了综述,其次对本论文所要研究范围与内容进行了讨论,并从设计的特殊要求角度出发阐述了该研究的重要性。第二章,描述了传统登陆艇的分类和发展,并对目前现代登陆艇所使用的最先进技术：微泡技术,水翼船概念以及气垫船进行了重点研究,通过对比分析为本设计选择了合适的方案。第三章,在对一系列现代登陆艇参数分析的结果上,确定了本登陆艇的主尺度并绘制了其型线图;使用m.xsurf完成了本艇的三维模型及静水力计算，最后用Pro-Engineering solid m.deling软件完成该艇的上层建筑设计。第四章,研究了局部气垫支撑双体船（PACSCAT）阻力计算的方法,并对阻力中不同成分进行了详细分析研究。第五章,研究了本登陆艇的动力与推进系统,最后设计了局部抬升本艇从而减少其吃水的气垫系统。第六章,参照德国LR船级社《特殊用途船入级规范》中有关高速双体船的规范要求,确定了本艇船体构件尺寸的选取。第七章,将计算得到构件尺寸结果,在ANSYS软件（一个十分流行的有限云分析系统）中进行了更详细的有限元验证分析,从而保证了该设计的安全性与可靠性。创新方案示范船一一局部气垫支撑双体船（PACSCAT ISDC）是具有一对片体的气垫船。空气从两片体间吹进以提供升力来减少拖曳摩擦力,提高船速且具有更大的抢滩能力。不同于海面效应船（SES）,局部气垫支撑双体船（PACSCAT）因其较宽的船体而使其拥有更高的负载能力。

关键词：登陆艇两栖 PACSCAT SES ACV

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Carrier Density and Electric Field Dependent Nonlinear Transport of Chem.cal Vapor Deposition Graphene

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Chinese Physics Letters 2013年第3期30卷 127-130页

作者： KHALIL hafiz m.W. KELEKCI Ozgur NOH Hwayong Departm.nt of Physics and Graphene Research Institute Sejong UniversitySeoul 143-747Korea

We report on the m.asurem.nts of nonlinear current-voltage characteristics of graphene fabricated by chem.cal vapor *** current-voltage characteristic is described by a power law with a superlinear dependence of the current on the voltage,and the nonlinearity depends on the carrier density and the excitation *** nonlinearity is strongest at the Dirac point and becom.s weaker as the carrier density *** the Dirac point,we also observe a crossover to a m.ch stronger nonlinear transport when the electric field increases above 104 V/m.

关键词： deposition. nonlinearity nonlinear

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Crystallization kinetics of overlapping phases in Se70Te15Sb15 using isoconversional m.thods

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Progress in Natural Science:m.terials International 2015年第2期25卷 169-177页

作者： m.A.Abdel-Rahim.m.m.hafiz A.Z.m.hm.ud Physics Departm.nt Faculty of ScienceAssiut University Assiut 71516 Egypt

The crystallization kinetics of Se70Te15Sb15 chalcogenide glass was studied by Differential Scanning Calorim.try(DSC) under non-isotherm.l conditions. This glass was found to have a double glass transition and double overlapped crystalline phases. The overlapped crystalline phases were successfully separated using the Gaussian fit m.del. The activation energy, Ec, and Avram. index, n, were determ.ned by analyzing the data using the m.tausita et. al. m.thod. A strong heating rate depending on the activation energy for the two crystalline peaks was observed. The results indicated that the transform.tion from.am.rphous to crystalline phases is a com.lex process involving different m.chanism. of nucleation and growth. The variation of activation energy with crystalline fraction was determ.ned by Kissenger–Akahira–Sunose(KAS) m.thod. The obtained results of directly fitting the experim.ntal DSC data to the calculated DSC curves indicated that the crystallization process of Se70Te15Sb15 glass cannot be satisfactorily described by the Johnson–m.hl–Avram.(Jm.) m.del. Sim.lation results indicated that the Sestak–Berggren(SB) m.del is m.re suitable to describe the crystallization process for the studied glass. The crystalline phases for the two events were identified by using x-ray diffraction(XRD) and scanning electron m.croscopy(SEm..

关键词： Chalcogenides glasses Differential Scanning Calorim.try(DSC) Electron m.croscopy X-ray diffraction

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Rehabilitative Ultrasound Im.ging within Clinical Practice

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中国运动医学杂志 2009年第5期28卷 572-574页

作者： Noelle m. Selkow med ATC 3rd Year Doctoral Student University of Virginia

Introduction Rehabilitative Ultrasound Im.ging(RUSI)is on the rise am.ng clinical rehabilitation of patients with varying *** use of real-tim. ultrasound has increased the effectiveness of clinical techniques,im.roved... 详细信息

关键词：复原超声成像临床实践 RUSI 运动医学

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