检索结果-南通市图书馆

substitution of Pb with (Li_(1/2)Bi_(1/2)) in PbZrO_(3)-based antiferroelectric ceramics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Advanced Dielectrics 2024年第1期14卷 74-81页

作者： Binzhi Liu Anand P.s.Gaur Jun Cui Xiaoli Tan Department of Materials science and Engineering Iowa state university AmesIA 50011USA

PbZrO_(3)-based antiferroelectric(AFE)ceramics are promising dielectrics for high-energy-density capacitors due to their reversible phase transitions during charge-discharge *** this work,a new composition series,[Pb_(0.93-x)La_(0.02)(Li_(1/2)Bi_(1/2))_(x)sr_(0.04)][Zr_(0.57)sn_(0.34)Ti_(0.09)]O_(3),with Li^(+)and Bi^(3+)substitution of Pb^(2+)at x=0,0.04,0.08,0.12,0.16 is investigated for the microstructure evolution,ferroelectric(FE)and dielectric *** is found that Li^(+) and Bi^(3+) substitution can significantly reduce the sintering temperature and simultaneously enhance the dielectric breakdown *** ultrahigh energy efficiency(94.0%)and a large energy density(3.22 J/cm^(3))are achieved in the composition of x=0.12 with a low sintering temperature(1075℃).

关键词： PbZrO_(3)-based antiferroelectrics LiþBi substitution energy storage energy efficiency

Effect of deep cryogenic treatment on the microstructural,mechanical and ballistic properties of AA7075-T6 aluminum alloy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2023年第12期30卷 101-110页

作者： s.Dharani kumar u.Magarajan saurabh s Kumar Rodríguez-Millan M Centre for Machining and Material Testing KPR Institute of Engineering and TechnologyCoimbatoreIndia Department of Mechanical Engineering Sri Venkateswara College of EngineeringChennaiIndia scientific Officer Ballistic Research Centre&Testing RangeNational Forensic Sciences UniversityGandhi NagarIndia Department of Mechanical Engineering University Carlos Ⅲ of MadridLeganesMadridSpain

The study focused on investigating the effect of Deep Cryogenic Treatment(DCT)on the mechanical and ballistic properties of AA7075-T6 aluminum *** microstructure,microhardness,tensile strength,and impact strength of the Base Material(BM)and DCT-treated 7075 samples were analyzed through metallographic analysis and mechanical *** microstructure of the DCT-treated 7075 samples revealed fine grains and a distribution of secondary phase *** tensile strength,impact strength,and microhardness of DCT-treated samples increased by 7.41%,4%,and 9.68%,respectively,compared to the BM *** fractography analysis of the tensile samples showed cleavage facets,microvoids,and dimples in both the *** ballistic behavior of the BM and DCT target plates were studied by impacting hard steel core projectiles at a velocity of 750±10 m/*** target plates failed due to petaling and ductile hole enlargement,and the depth of penetration(DOP)of the DCT target was less than that of the BM target,indicating a higher ballistic *** post-ballistic microstructure examination of the target plates showed the formation of an Adiabatic shear Band(AsB)without any *** was concluded that the DCT treatment improved the mechanical and ballistic properties of the aluminum alloy due to grain refinement and high dislocation density.

关键词： Deep cryogenic treatment AA7075-T6 Mechanical properties Ballistic Adiabatic shear band

Trace-Rare-Gas Optical Emission spectroscopy of Nitrogen Plasma Generated at a Frequency of 13.56 MHz

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Plasma science and Technology 2011年第2期13卷 208-212页

作者： N.u.REHMAN F.u.KHAN s.NAsEER G.MuRTAZA s.s.HussAIN I.AHMAD M.ZAKAuLLAH Department of Physics COMSATS Institute of Information Technology Department of Physics Gomal University Department of Physics Peshawar University Department of Physics Quaid-i-Azam University

Optical emission spectroscopic measurement of trace rare gas is carried out to determine the density of nitrogen （N） atom, in a nitrogen plasma, as a function of filling pressure and RF power applied. 2% of argon, used as an actinometer, is mixed with nitrogen. In order to normalize the changes in the excitation cross section and electron energy distribution function at different operational conditions, the Ar-I emission line at 419.83 nm is used, which is of nearly the same excitation efficiency coefficient as that of the nitrogen emission line at 493.51 nm. It is observed that the emission intensity of the selected argon and atomic nitrogen lines increases with both pressure and RF power, as does the nitrogen atomic density.

关键词： optical actinometry N atomic density EEDF RF plasma

Atomistic Investigation of shock-Induced Amorphization within Micro-shear Bands in Hexagonal Close-Packed Titanium

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica sinica(English Letters) 2024年第9期37卷 1590-1600页

作者： Z.C.Meng K.G.Wang T.Ali D.Li C.G.Bai D.s.Xu s.J.Li A.H.Feng G.J.Cao J.H.Yao Q.B.Fan H.Wang R.Yang Institute of Metal Research Chinese Academy of SciencesShenyang 110016China school of Materials science and Engineering University of Science and Technology of ChinaShenyang 110016China Interdisciplinary Centre for Additive Manufacturing(ICAM) School of Materials and ChemistryUniversity of Shanghai for Science and TechnologyShanghai 200093China school of Materials science and Engineering Tongji UniversityShanghai 201804China Key Laboratory for Light-Weight Materials Nanjing Tech UniversityNanjing 210009China National Key Laboratory of science and Technology on Materials under shock and Impact School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401135China

The mechanical response of a single crystal titanium sample against(0001)α surface impact was investigated using molecular dynamics ***,non-uniform plastic deformation was observed in the *** high strain rates,amorphization occurred near the edge of the contact region where severe shear strain induced a large number of stacking faults(sFs)and *** contrast,the central part of the contact region underwent less deformation with significantly fewer ***,instead of amorphization by consuming sFs and dislocations,there was a gradual increase in the density of dislocations and sFs during the process of *** local amorphous regions eventually grew into shear bands.

关键词： shock compression Amorphization shear band Titanium Molecular dynamics

Incorporation of a nanotechnology-based additive in cementitious products for clay stabilisation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2020年第5期12卷 1056-1069页

作者： E.u.Eyo s.Ng’ambi s.J.Abbey school of Energy Construction and EnvironmentFaculty of EngineeringEnvironment and ComputingCoventry UniversityCoventryUK Faculty of Environment and Technology Department of Geography and Environmental ManagementCivil Engineering ClusterUniversity of the West of EnglandBristolUK

The mechanical performances and water retention characteristics of clays,stabilised by partial substitution of cement with by-products and inclusion of a nanotechnology-based additive called RoadCem(RC),are studied in this *** unconfined compression tests and one-dimensional oedometer swelling were performed after 7 d of curing to understand the influence of addition of 1%of RC material in the stabilised soils with the cement partially replaced by 49%,59%and 69%of ground granulated blast furnace slag(GBBs)or pulverised fuel ash(PFA).The moisture retention capacity of the stabilised clays was also explored using the soil-water retention curve(sWRC)from the measured *** confirmed an obvious effect of the use of RC with the obtained strength and swell properties of the stabilised clays suitable for road application at 50%replacement of *** outcome is associated with the in-depth and penetrating hydration of the cementitious materials by the RC and water which results in the production of needle-like matrix with interlocking filaments e a phenomenon referred to as the‘wrapping’*** the other hand,the sWRC used to describe the water holding capacity and corresponding swell mechanism of clays stabilised by a proportion of RC showed a satisfactory *** moisture retention of the RC-modified clays was initially higher but reduced subsequently as the saturation level increased with decreasing *** phenomenon confirmed that clays stabilised by including the RC are water-proof in nature,thus ensuring reduced porosity and suction even at reduced water ***,the stabilised clays with the combination of cement,GGBs and RC showed a better performance compared to those with the PFA included.

关键词： Cement Ground granulated blast furnace slag(GBBs) Fly ash RoadCem(RC) swell stabilisation unconfined compressive strength soil-water retention curve(sWRC)

Combatting anthrax outbreaks across Nigeria's national land borders: need to optimize surveillance with epidemiological surveys

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Infectious Diseases of Poverty 2024年第1期13卷 100-100页

作者： Hammed O.Mogaji Babatunde Adewale stella I.smith Ehimario u.Igumbor Chidumebi J.Idemili Andrew W.Taylor-Robinson Yale school of Public Health Yale University New Haven USA Parasitology and Epidemiology unit Federal University Oye-Ekiti Oye-Ekiti Nigeria Department of Public Health and Epidemiology Nigerian Institute of Medical Research Lagos Nigeria Department of Molecular Biology and Biotechnology Nigerian Institute of Medical Research Lagos Nigeria Centre for Infectious Disease Research Nigerian Institute of Medical Research Lagos Nigeria Department of Public Health Walter Sisulu University Mthatha South Africa Institute of Health Policy Management and Evaluation University of Toronto Toronto Canada College of Health sciences Vin University Hanoi Vietnam Center for Global Health Perelman School of Medicine University of Pennsylvania Philadelphia USA

Background Anthrax is a non-contagious zoonotic disease caused by the Gram-positive,spore-forming bac-terium Bacillus *** is common in livestock and wild animals such as cattle,goats,sheep,camels,and *** humans,anthrax may occur after contact with contaminated carcasses or animal products like milk and *** best method to prevent anthrax in people is to ensure livestock are vaccinated,which significantly limits the risk of zoonotic spread to ***,the rate of vaccination of domesticated animals kept by nomadic pastoralists in West Africa is *** groups regularly cross over national boundaries with their grazing *** is a country that historically has done comparatively well to contain this public health ***,in 2023 several outbreaks of human disease appear linked to the consumption of anthrax-contaminated animal products brought into Nigeria by pastoralists from neighboring *** manifestations include skin sores or ulcers,nausea,vomiting,and *** article aims to raise awareness of recent outbreaks of anthrax in West Africa and to callfor a renewed focus on measures to combat this neglected public health concern to the *** body The imperative to pinpoint pivotal issues relating to the ongoing emergence of anthrax cases in Nigeria cannot be *** delving into the prevalence of anthrax in both livestock and human populations residing along Nigeria's borders,unraveling the genetic diversity and potential sources of *** strains,and identify-ing the primary animal host(s)responsible for transmission,we stand to enhance our understanding of this critical ***,investigating the multifaceted factors contributing to anthrax transmission,assessing community knowledge and practices,mapping common migratory routes of pastoralists,and formulating targeted interven-tion strategies tailored to the challenges of border communities,are each crucial steps towards eff

关键词： border Combat doubt

Leslie’s prey–predator model in discrete time

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2020年第6期13卷 231-255页

作者： u.A.Rozikov s.K.shoyimardonov V.I.Romanovskiy Institute of Mathematics 81 Mitzo Ulug'bek Street 100125 TashkentUzbekistan Department of Higher Mathematics Tashkent university of Information Technologies Named After Muhammad Al-Khwarizmi Tashkent Uzbekistan

We consider the Leslie’s prey–predator model with discrete *** model is given by a nonlinear evolution operator depending on five *** show that this operator has two fixed points and define type of each fixed point depending on the *** two invariant sets of the evolution operator,we study the dynamical systems generated by the operator on each invariant *** on the parameters,we classify the dynamics between a predator and a prey of the Leslie’s model.

关键词： Population Leslie model fixed points prey-predator discrete time

Ocean ecosystem discrete time dynamics generated by l-Vol terra operators

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2019年第2期12卷 77-100页

作者： u.A.Rozikov s.K.shoyimardonov Institute of Mathematics 81Mirzo Ulug'bek Str.100125TashkentUzbekistan Department of Higher Mathematics Tashkent university of Information Technologies(Named After)Muhammad al-Khwarizmi TashkentUzbekistan

We consider a discrete-time dynamical system generated by a nonlinear operator(with four real parameters a,b,c,d)of ocean *** find conditions on the parameters under which the operator is reduced to a l-Volterra quadratic stochastic operator mapping two-dimensional simplex to *** show that if cd(c+d)=0,then(under some conditions on a,b)this l-Volterra operator may have up to three or a countable set of fixed points;if cd(c+d)≠0,then the operator has up to three fixed *** on the parameters,the fixed points may be attracting,repelling or saddle *** limit behaviors of trajectories of the dynamical system are *** is shown that independently on values of parameters and on initial(starting)point,all trajectories ***,the operator(dynamical system)is *** give some biological interpretations of our results.

关键词： Quadratic stochastic operator Volterra operator l-Volterra operator ecosystem modeling

Application of Reactive Ion Etching to the Fabrication of Microstructure on Mo/si Multilayer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 1999年第9期16卷 665-666页

作者： LE Zi-chun L.Dreeskornfeld s.Rahn R.segler u.Kleineberg u.Heinzmann Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012 Fakultät für Physik Universität BielefeldUniversitatsstraβe 25D-33615 BielefeldGermany

Mo/si muitilayer mirrors(30 periods,doublelayer thickness 7nm)with the AZ-PF514 resist pattern whose smallest lines and spaces structure was 0.5pm were etched by reactive ion etching(RIE)in a fluorinated *** etch rate,selectivity and etch profile were investigated as a function of the gas mixture,pressure,and plasma rf *** groove depth and the etch proHle were investigated by an atomic force microscope before RIE,after RIE and after resist removal.

关键词： Mo/si smallest selectivity