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b.llistic design and testing of a composite armour reinforced b. CNTs suitab.e for armoured vehicles

Defence Technology（防务技术） 2024年第2期32卷 173-195页

作者： Evangelos ch.Tsirogiannis Evangelos Daskalakis Mohamed H.Hassan Ab.alla M.Omar Paulo b.rtolo EODH SA Research and Development DepartmentLakkoma Chalkidikis63080Greece School of Mechanical Aerospace and Civil EngineeringUniversity of ManchesterManchesterM139PLUK Singapore Centre for 3D Printing School of Mechanical and Aerospace EngineeringNanyang Technological University639798Singapore

This paper is investigating the use of composite armour reinforced b. nanomaterials, for the protection of light armoured(LAV) and medium armoured military vehicles(MAV), and the interaction b.tween the composite materials and high-performance b.llistic projectiles. Four armour materials, consisted of front hyb.id fib.e reinforced polymer cover layer, ceramic strike-face, fib.e reinforced polymer intermediate layer and the metal matrix composite reinforced b.ckplate, were manufactured and assemb.ed b. adhesive technology. The proposed laminated protection system is suitab.e for armoured ground vehicles;however, it could b. used as armour on ground, air and naval platforms. The design of the protection system, including material selection and thickness, was elab.rated depending on the performance requirements of Level 4 + STANAG 4569 military standard(projectile 14.5 mm × 114 mm API b.2) and especially on a design philosophy which is analysed with the specifications. The b.ckplate of this new composite is a hyb.id material of Metal Matrix Composite(MMC) reinforced with carb.n nanotub.s(CNTs), manufactured with the use of powder metallurgy technique. The composite b.ckplate material was morphologically, mechanically and chemically analysed. Results show that all plates are presenting high mechanical properties and b.llistic characteristics, compared to commonly used armour plates. Real military b.llistic tests according to AEP-STANAG 4569 were carried out for the total composite armour systems. After the b.llistic tests, AA2024-CNT3 showed the b.st protection results, compared with the other plates(AA2024-CNT1 and AA2024-CNT2), with the projectile b.ing unab.e to fully penetrate the composite plate.

关键词： Passive armour protection Protective armour b.llistic performance Hyb.id composites Vehicle protection

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Human Gait Recognition for b.ometrics Application b.sed on Deep Learning Fusion Assisted Framework

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Computers, Materials & Continua 2024年第1期78卷 357-374页

作者： ch Avais Hanif Muhammad Ali Mughal Muhammad Attique Khan Nouf Ab.ullah Almujally Taerang Kim Jae-Hyuk cha Department of Electrical Engineering HITEC UniversityTaxila47080Pakistan Department of Computer Science and Mathematics Lebanese American UniversityBeirutLebanon Department of Computer Science HITEC UniversityTaxila47080Pakistan Department of Information Systems College of Computer and Information SciencesPrincess Nourah bint Abdulrahman UniversityP.O.Box 84428Riyadh11671Saudi Arabia Department of Computer Science Hanyang UniversitySeoul04763Korea

The demand for a non-contact b.ometric approach for candidate identification has grown over the past ten *** on the most important b.ometric application,human gait analysis is a significant research topic in computer *** have paid a lot of attention to gait recognition,specifically the identification of people b.sed on their walking patterns,due to its potential to correctly identify people far *** recognition systems have b.en used in a variety of applications,including security,medical examinations,identity management,and access *** systems require a complex comb.nation of technical,operational,and definitional *** employment of gait recognition techniques and technologies has produced a numb.r of b.neficial and well-liked *** proposes a novel deep learning-b.sed framework for human gait classification in video *** framework’smain challenge is improving the accuracy of accuracy gait classification under varying conditions,such as carrying a b.g and changing *** proposed method’s first step is selecting two pre-trained deep learningmodels and training fromscratch using deep transfer ***,deepmodels have b.en trained using static hyperparameters;however,the learning rate is calculated using the particle swarmoptimization(PSO)***,the b.st features are selected from b.th trained models using the Harris Hawks controlled Sine-Cosine optimization *** algorithm chooses the b.st features,comb.ned in a novel correlation-b.sed fusion ***,the fused b.st features are categorized using medium,b.-layer,and tri-layered neural *** the pub.icly accessib.e dataset known as the CASIA-b.dataset,the experimental process of the suggested technique was carried out,and an improved accuracy of 94.14% was *** achieved accuracy of the proposed method is improved b. the recent state-of-the-art techniques that show the significance of this wor

关键词： Gait recognition covariant factors b.ometric deep learning fusion feature selection

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Synergistic Interactions of Soil and Vegetation in Agroforestry Systems in Mitigating Climate change in Upper East Region, Ghana

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American Journal of Climate change 2024年第2期13卷 140-162页

作者： Joshua A. Adomb.re Ab.ul-Wahab.M. Imoro Eunice Essel Nang b. Douti Department of Environmental Science C. K. Tedam University of Technology and Applied Sciences Navrongo Ghana Department of Forestry and Forest Resources Management University for Development Studies Tamale Ghana Department of Crop Science and b.otechnology C. K. Tedam University of Technology and Applied Sciences Navrongo Ghana

Climate change has b.en a glob.l pandemic with its adverse impacts affecting environments and livelihoods. This has b.en largely attrib.ted to anthropogenic activities which generate large amounts of Green House Gases (GHGs), notab.y carb.n dioxide (CO2), methane (ch4), and nitrous oxide (N2O) among others. In the Upper East of Ghana, climate change manifests in erratic rainfalls, drought, high temperatures, high wind speeds, high intensity rainfall, windstorms, flooding, declining vegetation cover, perennial devastating b.shfires etc. Practices such as b.rning farm residues, use of dung as fuel for cooking, excessive application of nitrogenous fertilizers, and deforestation that are prevalent in the region exacerb.te the situation. Although, efforts made b. governmental and none-governmental organizations to mitigate climate change through afforestation, agroforestry and promotion of less fuelwood consuming cook stoves, land management practices antagonize these efforts as more CO2 is generated than the carrying capacity of vegetation in the region. Research findings have estab.ished the role of trees and soil in carb.n sequestration in mitigating climate. However, there is limited knowledge on how the vegetation and soil in agroforestry interplay in mitigation climate change. It is against this b.ckground that this review seeks to investigate how vegetation and soil in an agroforestry interact synergistically to sequester carb.n and contrib.te to mitigating climate change in Upper East region of Ghana. In this review, it was discovered soil stored more carb.n than vegetation in an agroforestry system and is much effective in mitigating climate change. It was found out that in order to make soil and vegetation in an agroforestry system interact synergistically to effectively mitigate climate change, Climate Smart Agriculture practice which integrates trees, and perennials crops effectively mitigates climate. The review concluded that tillage practices that ensure r

关键词： Climate change Carb.n Sequestration Agroforestry Photosynthesis Nutrient Mining Synergistic

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Erratum to:Superlub.icity of epitaxial monolayer WS_(2)on graphene

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Nano Research 2024年第6期17卷 5754-5754页

作者： Holger b.ch Antonio Rossi Stiven Forti Domenica Convertino Valentina Tozzini Camilla Coletti Center for Nanotechnology Innovation@NEST Istituto Italiano di TecnologiaPiazza S.Silvestro 1256127 PisaItaly NEST Istituto Nanoscienze–CNR and Scuola Normale SuperiorePiazza San Silvestro 1256127 PisaItaly Graphene Lab. Istituto Italiano di TecnologiaVia Morego 3016163 GenovaItaly

The article"Superlub.icity of epitaxial monolayer WS2 on graphene",written b. Holger b.ch,Antonio Rossi,Stiven Forti,Domenica Convertino,Valentina Tozzini,and Camilla Coletti,was originally pub.ished electronically on the pub.isher’s internet portal(currently SpringerLink)on June 18th 2018 without open *** the author(s)’decision to opt for Open choice the copyright of the article changed in August 2018 to©The Author(s)2018 and the article is forthwith distrib.ted under the terms of the Creative Commons Attrib.tion 4.0 International License(http://***/licenses/b./4.0/),which permits use,duplication,adaptation,distrib.tion and reproduction in any medium or format,as long as you give appropriate credit to the original author(s)and the source,provide a link to the Creative Commons license and indicate if changes were made.

关键词： monolayer epitaxial license

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自推进胶囊在小肠中移动时的优化控制

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机械工程学报 2024年

作者：廖茂林李智朱佳鹏王泽旭 JOSEPHPáez chávez 北京科技大学机械工程学院北京科技大学井下智能控制研究院德累斯顿工业大学动力学研究中心

在消化道检测领域，传统的管线式内镜常给患者带来极大的心理负担与生理不适，胶囊内镜则因驱动方式和控制复杂等原因而难以对小肠部位开展全面而高效的检测。为此，考虑以双边约束的激振胶囊为研究对象，根据小肠结构的变化分别建立了... 详细信息

在消化道检测领域，传统的管线式内镜常给患者带来极大的心理负担与生理不适，胶囊内镜则因驱动方式和控制复杂等原因而难以对小肠部位开展全面而高效的检测。为此，考虑以双边约束的激振胶囊为研究对象，根据小肠结构的变化分别建立了扩张段和狭窄段的小肠-胶囊耦合动力学模型，并以小肠多变的摩擦环境以及对胶囊的包裹程度不同作为不稳定因素，分析了自推进胶囊的动力学行为规律。基于此，同时以胶囊的移动速度、单位能耗和对小肠壁冲击力作为优化目标，采用(Six-Sigma+NSGA-II+Monte-Carlo)组合优化算法获取胶囊可控移动对应的参数组合区间。最终，结合ADAMS动力学仿真与实验测试验证了当采用优化后的参数组合控制自推进胶囊时，可使其实现低能耗低冲击的定速定向移动。

关键词：小肠胶囊非光滑多目标优化运动控制

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Rotational and Vib.ational Temperatures of Atmospheric Doub.e Arc Argon-Nitrogen Plasma

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chinese Physics Letters 2007年第5期24卷 1317-1320页

作者：严建华屠昕马增益岑可法 b. G. chéon State Key Lab.ratory of Clean Energy Utilization Zhejiang University Hangzhou 310027 UMR 6614 CNRS CORIA Saint Etienne du Rouvray 76801 France

The spectroscopic technique is employed to study the emission of atmospheric argon-nitrogen plasma jet generated b. an original dc doub.e anode plasma torch. The molecular b.nds of the N^＋2 first negative system are ob.erved at the torch exit and chosen to evaluate the rotational and vib.ational temperatures in comparison with the simulated spectra. The excitation temperature （Texc ≈ 9600 K） is determined from the b.ltzmann plot method. The results show that the rotational, vib.ational, electron and kinetic temperatures are in good agreement with one another, which indicates that the core region of atmospheric doub.e arc argon-nitrogen plasma jet at the torch exit is close to the local thermodynamic equilib.ium state under our experimental conditions.

关键词： N-2(+) b.ND

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Ferroelectricity Induced b. Oxygen Vacancies in Rhomb.hedral ZrO_(2) Thin Films

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Energy & Environmental Materials 2024年第1期7卷 229-237页

作者： Veniero Lenzi José P.b.Silva b.etislav Šmíd Vladimir Matoín Cosmin M.Istrate Corneliu Ghica Judith L.MacManus-Driscoll Luís Marques Physics Center of Minho and Porto Universities(CF-UM-UP) University of MinhoCampus de Gualtar 4710-057Braga Portugal Lab.ratory of Physics for Materials and Emergent Technologies LapMETUniversity of Minho4710-057Braga Portugal Department of Surface and Plasma Science Faculty of Mathematics and PhysicsCharles UniversityV Holešovičkách 218000Prague 8 Czech Republic National Institute of Materials Physics 105 bis Atomistilor 077125Magurele Romania Department of Materials Science and Metallurgy 27 Charles Babbage Rd.Cambridge CB3 OFSUK

Rhomb.hedral phase Hf_(x)Zr_(1.x)O_(2)(HZO,x from 0 to 1)films are promising for achieving rob.st ferroelectric polarization without the need for an initial wake-up pre-cycling,as is normally the case for the more commonly studied orthorhomb.c ***,a large spontaneous polarization ob.erved in rhomb.hedral films is not fully understood,and there are also large discrepancies b.tween experimental and theoretical *** this work,in rhomb.hedral ZrO_(2)thin films,we show that oxygen vacancies are not only a key factor for stab.lizing the phase,b.t they are also a source of ferroelectric polarization in the *** is shown experimentally through the investigation of the structural properties,chemical composition and the ferroelectric properties of the films b.fore and after an annealing at moderate temperature(400℃)in an oxygen environment to reduce the V_(o)concentration *** experimental work is supported b. density functional theory(DFT)calculations which show that the rhomb.hedral phase is the most stab.e one in highly oxygen defective ZrO_(2)*** DFT calculations also show that V_(o)contrib.te to the ferroelectric *** findings reveal the importance of V_(o)for stab.lizing rhomb.hedral ZrO_(2)thin films with superior ferroelectric properties.

关键词： charged defects ferroelectric polarization rhomb.hedral phase stab.lity zirconia

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Pelleting and particle size reduction of corn increase net energy and digestib.lity of fib.r,protein,and fat in corn-soyb.an meal diets fed to group-housed pigs

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Journal of Animal Science and b.otechnology 2024年第4期15卷 1751-1760页

作者： Su A Lee Diego A.Rodriguez chad b.Paulk Hans H.Stein Department of Animal Sciences University of IllinoisUrbanaIL 61801USA Department of Grain Sciences and Industry Kansas State UniversityManhattanKS 66506USA

b.ckground Reduction of the particle size of corn increases energy digestib.lity and concentrations of digestib.e and metab.lizab.e *** may also reduce particle size of grain,b.t it is not known if there are interactions b.tween particle size reduction and *** ob.ective of this experiment was to test the hypothesis that particle size reduction and pelleting,separately or in comb.nation,increase N b.lance,apparent total tract digestib.lity(ATTD)of fib.r and fat,and net energy(NE)in corn-soyb.an meal diets fed to group-housed *** Six corn-soyb.an meal-b.sed diets were used in a 3×2 factorial design with 3 particle sizes of corn(i.e.,700,500,or 300μm)and 2 diet forms(i.e.,meal or pelleted).Pigs were allowed ad lib.tum access to feed and ***-four castrated male pigs(initial weight:29.52 kg;standard diviation:1.40)were allotted to the 6 diets using a 6×6 Latin square design with 6 calorimeter chamb.rs(i.e.,4 pigs/chamb.r)and 6 *** consumption and CO_(2)and ch_(4)productions were measured during fed and fasting states and fecal and urine samples were *** Regardless of particle size of corn,the ATTD of gross energy(GE),N,and acid-hydrolyzed ether extract(AEE),and the concentration of NE were greater(Pb. reducing the particle size of corn,b.t the increase was greater in meal diets than in pelleted diets(interaction;Pb.th pelleting and reduction of corn particle size increased nutrient digestib.lity and NE,b.t increases were greater in meal diets than in pelleted diets.

关键词： Corn Digestib.lity Feed technology Net energy Particle size Pelleting

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Effect of spark plasma sintering and reinforcements on the formation of ultra-fine and nanograins in AA2024-Tib.-Y hyb.id composites

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Progress in Natural Science:Materials International 2022年第1期32卷 79-86页

作者： ch.Suresh Vidyasagar D.b.Karunakar Department of Architecture and Planning Indian Institute of Technology Roorkee Mechanical and Industrial Engineering Department Indian Institute of Technology Roorkee

This study reports the influence of sintering mechanism and reinforcement materials on the formation of ultra-fine and nanograins in Al-Tib.Y nanohyb.id composites. The mechanical properties of the composites and their corresponding micro and nanostructures are correlated. The experimental and characterization results revealed that despite the addition of Tib. the hard and b.ittle AlTi phase formation in the composites was suppressed and hence, their ductility was retained. It was found that yttrium content of 0.3 wt% was the optimum amount which created advantageous spark plasma sintering conditions, and the addition of 0.3 wt% promoted the formation of b.-modal size grains（ultra-fine and nano） along with micro grains, Ω and other nano precipitates, resulting in a significant enhancement in the composite properties. The formation of ultra-fine and nanograins may b. attrib.ted to the comb.ned effect of melting and rapid solidification at necking zones due to Joule’s heating and thermomechanical fatigue. Among all the sintered composites, the highest hardness（137 HV）, ultimate tensile strength（UTS）(496 MPa), yield strength（YS）(438 MPa) with 15.7% elongation were ob.ained in the sintered sample reinforced with 1.0 wt% Tib.nd 0.3 wt% yttrium.

关键词： Hyb.id composites Ultra-fine grains Nano grains Spark plasma sintering Nano precipitates Microstructure

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Studies on Thermal Conductivity of Diamond Film

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High Technology Letters 1995年第1期1卷 91-94页

作者： Jingb.ao, C. Hong, ch. Jifa, Zh. Dayan, b. Rongchuan, F. Univ of Science and Technology of China Hefei China

Diamond films were prepared b. electron-assisted chemical vapor deposition (EACVD) system, and the thermal diffusivities of the films with or without sub.trate were studied b. use of photothermal deflection (PTD) technique. The results show that less non-diamond component and larger crystalline size result in higher thermal conductivity of CVD diamond film. The influence of sub.trate on the measurement of thermal conductivity of the film was investigated, and a simple two-layer heat conduction model is given to account for the influence and used to draw the thermal conductivity of the film from the effective thermal diffusivity of film/sub.trate system.

关键词： Diamond film Photothermal deflection Thermal conductivity Sub.trate

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