检索结果-南通市图书馆

strength-ductility synergy in a 1.4 GPa austenitic steel with a heterogeneous lamellar microstructure

在线全文

学校读者我要写书评

暂无评论

Journal of Materials science & Technology 2022年第11期106卷 133-138页

作者： Gang Niu Hatem s.Zurob r.D.K.Misra Huibin Wu Yu Zou Department of Materials science and Engineering University of TorontoTorontoONM5S 3E4Canada Collaborative Innovation Center of Steel TechnologyUniversity of Science and Technology BeijingBeijing 100083China Department of Materials science and Engineering McMaster UniversityHamiltonONL8S 4L7Canada Department of Metallurgical Materials and Biomedical EngineeringUniversity of Texas at El PasoEl PasoTX 79968USA Collaborative Innovation Center of steel Technology University of Science and Technology BeijingBeijing 100083China Department of Materials science and Engineering University of TorontoTorontoONM5S 3E4Canada

*** advanced high-strength steels with good ductility are essen-tial to the manufacturing,structural safety,and light-weighting of load-bearing structures in many industries[1-3].Austenitic stain-less steel(Ass)exhibits high ductility due to the TrIP and/or TWIP effect that can alleviate stress concentration,prevent void nucle-ation,enhance work hardening,and postpone necking[4-6].The yield strength of conventional Ass is generally low(∼200-500 MPa),and their deformation resistance is insufficient for many load-bearing applications[6].Previous studies reported the in-creased yield strength in various austenitic steels through grain refinement,dislocation strengthening,precipitation strengthening,and heterogeneous hardening[7-14].A single strengthening mech-anism,however,is typically insufficient to obtain ultrahigh yield strength over 1 GPa in austenitic steel[12].

关键词： steel ductility austenitic

Quantifying the refractive index dispersion of a pigmented biological tissue using Jamin–lebedeff interference microscopy

在线全文

学校读者我要写书评

暂无评论

light(science & applications) 2013年第1期2卷 58-63页

作者： Doekele G stavenga Hein l leertouwer Bodo D Wilts Computational Physics Zernike Institute for Advanced MaterialsUniversity of GroningenNL-9747 AG GroningenThe Netherlands

Jamin–lebedeff polarizing interference microscopy is a classical method for determining the refractive index and thickness of transparent ***,we extend the application of this method to pigmented,absorbing biological tissues,based on a theoretical derivation using Jones *** novel method is applied to the wings of the American rubyspot damselfly,Hetaerina *** membranes in the red-colored parts of the damselfly’s wings,with a thickness of 2.5 μm,contain a pigment with maximal absorption at 490 nm and a peak absorbance coefficient of 0.7 μm^(-1).The high pigment density causes a considerable and anomalous dispersion of the refractive *** result can be quantitatively understood from the pigment absorbance spectrum by applying the Kramers–Kronig dispersion *** of the spectral dependence of the refractive index and the absorption are valuable for gaining quantitative insight into how the material properties of animal tissues influence coloration.

关键词： absorption chitin insect wings Jones calculus Kramers–Kronig relations

Biomolecules of Interest Present in the Main Industrial Wood species Used in Indonesia-A review

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 renewable Materials 2021年第3期9卷 399-449页

作者： resa Martha Mahdi Mubarok Wayan Darmawan Wasrin syafii stéphane Dumarcay Christine Gérardin Charbonnier Philippe Gérardin Universitéde lorraine Institut National de Recherche pour l’Agriculturel’Alimentation et l’EnvironnementLaboratoire d'Etudes et de Recherche sur le Matériau BoisNancyFrance Department of Forest Products Faculty of Forestry and EnvironmentInstitut Pertanian BogorBogor UniversityBogorIndonesia

As a tropical archipelagic country,Indonesia’s forests possess high biodiversity,including its wide variety of wood *** of biomolecules.r.l.ased from woody plant extracts has been gaining attractive interests since in the middle of 20th *** paper focuses on a literature review of the potential valorisation of biomolecules.r.l.ased from twenty wood species exploited in *** has revealed that depending on the natural origin of the wood species studied and harmonized with the ethnobotanical and ethnomedicinal knowledge,the extractives derived from the woody plants have given valuable heritages in the fields of medicines and *** families of the bioactive compounds found in the extracts mainly consisted of flavonoids,stilbenes,stilbenoids,lignans,tannins,simple phenols,terpenes,terpenoids,alkaloids,quinones,and *** addition,biological or pharmacological activities of the extracts/isolated phytochemicals were recorded to have antioxidant,antimicrobial,antifungal,anti-inflammatory,anti-diabetes,anti-dysentery,anticancer,analgesic,anti-malaria,and anti-Alzheimer *** from these remarkable characteristics of woody plant extractives,further studies concerning the valorisation of these extractives in the fields of nutraceutical,cosmetic,bio-control,bio-stimulation,and other advanced applications would be of interest.

关键词： Bark by-product bioactivity extractive Indonesia industry molecule valorization wood species

Hydrogen Production via Hydrolysis and Alcoholysis of light Metal-Based Materials:A review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro letters 2021年第9期13卷 75-104页

作者： liuzhang Ouyang Jun Jiang Kang Chen Min Zhu Zongwen liu school of Materials science and Engineering Guangdong Provincial Key Laboratory of Advanced Energy Storage MaterialsSouth China University of TechnologyGuangzhou 510641People’s Republic of China China-Aus.r.l.a Joint laboratory for Energy and Environmental Materials Key Laboratory of Fuel Cell Technology of Guangdong ProvinceGuangzhou 510641People’s Republic of China school of Chemical and Biomolecular Engineering The University of SydneySydneyNSW 2006Australia The University of sydney Nano Institute The University of SydneySydneyNSW 2006Australia

As an environmentally friendly and high-density energy carrier,hydrogen has been recognized as one of the ideal alternatives for fossil *** of the major challenges faced by“hydrogen economy”is the development of efficient,low-cost,safe and selective hydrogen generation from chemical storage *** this review,we summarize the recent advances in hydrogen production via hydrolysis and alcoholysis of light-metal-based materials,such as borohydrides,Mg-based and Al-based materials,and the highly efficient regeneration of ***,most of these hydrolysable materials are still plagued by sluggish kinetics and low hydrogen *** a number of strategies including catalysis,alloying,solution modification,and ball milling have been developed to overcome these drawbacks,the high costs required for the“one-pass”utilization of hydrolysis/alcoholysis systems have ultimately made these techniques almost impossible for practical large-scale ***,it is imperative to develop low-cost material systems based on abundant resources and effective recycling technologies of spent fuels for efficient transport,production and storage of hydrogen in a fuel cell-based hydrogen economy.

关键词： Hydrolysis Alcoholysis light metal-based materials Borohydrides Magnesium Aluminum Hydrogen production

Achieving Tunable Cold/Warm White‑light Emission in a single Perovskite Material with Near‑Unity Photoluminescence Quantum Yield

在线全文

学校读者我要写书评

暂无评论

纳微快报:英文版 2023年第11期15卷 305-316页

作者： Bo Zhou Aixuan Du Dong Ding Zexiang liu Ye Wang Haizhe Zhong Henan li Hanlin Hu Yumeng shi International Collaborative laboratory of 2D Materials for Optoelectronics science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060People’s Republic of China shandong laboratory of Yantai advanced Materials and Green Manufacturing Yantai 264006People’s Republic of China Key laboratory of Material Physics School of Physics and MicroelectronicsZhengzhou UniversityMinistry of EducationZhengzhou 450052People’s Republic of China school of Electronics and Information Engineering Shenzhen UniversityShenzhen 518060People’s Republic of China Hoffmann Institute of advanced Materials Shenzhen PolytechnicShenzhen 518060People’s Republic of China

single materials that exhibit efficient and stable white-light emission are highly desirable for lighting *** paper reports a novel zero-dimensional perovskite,rb_(4)CdCl_(6):sn^(2+),Mn^(2+),which demonstrates exceptional white-light properties including adjustable correlated color temperature,high color rendering index of up to 85,and near-unity photoluminescence quantum yield of 99%.Using a co-doping strategy involving sn^(2+)and Mn^(2+),cyan-orange dual-band emission with complementary spectral ranges is activated by the self-trapped excitons and d-d transitions of the sn^(2+)and Mn^(2+)centers in the rb_(4)CdCl_(6)host,***,although Mn^(2+)ions doped in rb_(4)CdCl_(6)are difficult to excite,efficient Mn^(2+)emission can be realized through an ultra-high-efficient energy transfer between sn^(2+)and Mn^(2+)via the formation of adjacent exchange-coupled sn–Mn *** from this efficient Dexter energy transfer process,the dual emission shares the same optimal excitation wavelengths of the sn^(2+)centers and suppresses the non-radiative vibration relaxation ***,the relative intensities of the dual-emission components can be modulated flexibly by adjusting the fraction of the sn^(2+)ions to the sn–Mn *** co-doping approach involving short-range energy transfer represents a promising avenue for achieving high-quality white light within a single material.

关键词： 0D perovskite Multi-ion doping Near-unity white light Energy transfer self-trapped excitons

BiFeO_(3)-BaTiO_(3):A new generation of lead-free electroceramics

在线全文

学校读者我要写书评

暂无评论

Journal of advanced Dielectrics 2018年第6期8卷 8-42页

作者： Dawei Wang Ge Wang shunsuke Murakami Zhongming Fan Antonio Feteira Di Zhou shikuan sun Quanliang Zhao Ian M.reaney Department of Materials science and Engineering University of sheffield Sheffield S13JDUK Department of Materials science and Engineering Iowa state University AmesIowa 50011USA Christian Doppler laboratory for advanced Ferroic Oxides sheffield Hallam University Sheffield S11WBUK Electronic Materials research laboratory Key laboratory of the Ministry of Education&International Center for Dielectric research Xi’an Jiaotong University Xi’an 710049ShaanxiP.R.China school of Mechanical and Materials Engineering North China University of Technology Beijing 100144 P.R.China

lead-based electroceramics such as Pb(***)O_(3)(PZT)and its derivatives have excellent piezoelectric,pyroelectric and energy storage properties and can be used in a wide range of *** lead-free replacements for PZT such as potassium sodium niobate(KNN)and sodium bismuth titanate(NBT)have a much more limited range of useful properties and have been optimized primarily for piezoelectric ***,we review the initial results on a new generation of lead-free electroceramics based on BiFeO_(3)-BaTiO_(3)(BF-BT)highlighting the essential crystal chemistry that permits a wide range of functional *** demonstrate that with the appropriate dopants and heat treatment,BF-BT can be used to fabricate commercially viable ceramics for applications,ranging from sensors,multilayer actuators,capacitors and high-density energy storage *** also assess the potential of BF-BT-based ceramics for electrocaloric and pyroelectric applications.

关键词： BiFeO_(3)-BaTiO_(3) lead-free piezoelectrics energy storage dielectrics capacitors

Thermophysical and Mechanical Characterization of Poto-Poto Compressed Blocks for Use as Fill Material

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Materials sciences and applications 2021年第10期12卷 437-459页

作者： Kowa K. Eric Jean Claude Damfeu Pettang J. Ursulala Joel Ducourneau Paul Woafo Chispin Pettang Physics Department University of Yaounde I Yaounde Cameroon laboratory of Energy Water and Environment National Advanced School of Engineering University of Yaounde I Yaounde Cameroon CNrs LEMTA UMR 7563 Vand&aelig uvre-lès-Nancy F-54500 France

This article is devoted to the thermophysical and mechanical study of an eco-material, poto-poto. The objective is to study the influence of the addition of bamboo fibers on the thermophysical properties of the material, while verifying that it complies with the mechanical standards in Cameroon. A double study is therefore carried out: a mechanical characterization whose objective is to determine the mechanical properties (compressive strength, flexural strength and Young’s modulus) and a thermophysical characterization whose objective is to determine the thermal conductivity. For the thermophysical characterization, the asymmetric hot plane experimental setup based on 1D quadrupole modelling was developed and simulated for the estimation of thermal effusivity E and volume heat capacity ρCp. The obtained experimental results show that the apparent thermal conductivity of the developed materials decreases with increasing fibers. Although the reference material (0% fibers) has a much higher conductivity than the ordinary sand block (1.15 Wmsup>-1sup> Ksup>-1sup>), the addition of fibers, already at 2%, contributes to decrease this conductivity (0.95 Wmsup>-1sup> Ksup>-1sup>). From the point of view of thermal insulation and energy savings, the thermal conductivity results obtained show that the use of these materials with a maximum fibercontent of 6% would be a better thermal insulator than sand block or compressed earth brick. The compressive strength obtained is such that rc > 0.6 MPa. All the materials developed meet the design standards when used as infill.

关键词： Thermoméchanical Charactézisation Poto-Poto Thermal Insulation Young’s Modulus

Application of graphite screen printed electrode modified with dysprosium tungstate nanoparticles in voltammetric determination of epinephrine in the presence of acetylcholine

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 rare Earths 2018年第7期36卷 750-757页

作者： Hadi Beitollahi Zahra Dourandish somayeh Tajik Mohammad reza Ganjali Parviz Norouzi Farnoush Faridbod Environment Department Irtstitute of Science and High Technology and Environmental SciencesGraduate University of Advanced Technology Department of Chemistry Graduate University of Advanced Technology NanoBioElectrochemistry research Center Bam University of Medical Scicnce Center of Excellence in Electrochemistry Faculty of ChemistryUniversity of Tehran Biosensor research Center Endocrinology & Metabolism Molecular-Cellular Sciences InstituteTehran University of Medical Sciences

The current work focuses on the development of a sensitive and selective electrochemical device based on a graphite screen printed electrode modified with Dy2（WO4）3 nanoparticles（DWO/sPE） for the analysis of epinephrine in samples also containing acetylcholine. The study proves that the sensor has excellent electron-mediating behavior in the oxidation of epinephrine in a 0.1 mol/l phosphate buffer solution（PBs）（pH 7.0）. The application of the DWO/sPE in differential pulse voltammetry（DPV） is found to lead to distinct response for the oxidation of epinephrine and acetylcholine, with the potentials of the epinephrine and acetylcholine peaks（△Ep） to be 550 mV apart. The detection limits of the method for epinephrine and acetylcholine are 0.5 and 0.7 μmol/l（s/N = 3） and the responses are found to be linear in the concentration ranges of 1.0-900.0 μmol/l and 1.0-1200.0 μmol/l in a PBs buffer（pH = 7.0）respectively. The modified electrode was used for the detection of epinephrine and acetylcholine in real samples and found to produce satisfactory results. These results can be a proof that Dy2（WO4）3 nanoparticles can find promising applications in electrochemical sensors to be used for the analysis of（bio）chemical species.

关键词： Epinephrine Acetylcholine Dy2(WO4)3 nanoparticles Graphite screen printed electrode rare earths

solution flow rate influence on Zns thin films properties grown by ultrasonic spray for optoelectronic application

在线全文

学校读者我要写书评

暂无评论

Journal of semiconductors 2018年第9期39卷 1-7页

作者： A.Derbali H.saidi A.Attaf H.Benamra A.Bouhdjer N.Attaf H.Ezzaouia l.Derbali M.s.Aida laboratory of Thin Films and applications lPCMA University of Biskra Algeria BP 145 RP 07000 Biskra Algerie laboratoire de Couches Minces et Interfaces Faculte des sciences Universite de Constantine Algeria laboratory of semiconductors Nanostructures and Advanced Technology (LSNTA) Research and Technology Centreof Energy BorjCedria Science and Technology Park BP 95 2050 Hammam-Lif Tunisia Department of Physics Faculty of sciences King Abdulaziz University Djeddah KSA

The aim of this work is to investigate the dependence of Zn s thin films structural and optical properties with the solution flow rate during the deposition using an ultrasonic spray method. The solution flow rate ranged from 10 to 50 m l/h and the substrate temperature was maintained at 450 °C. The effect of the solution flow rate on the properties of Zn s thin films was investigated by X-ray diffraction（XrD）, scanning electron microscopy（sEM）, optical transmittance spectroscopy（UV–V） and the four-point method. The X-ray diffraction analysis showed that the deposited material was pure zinc sulphide, it has a cubic sphalerite structure with preferential orientation along the（111） direction. The grain size values were calculated and found to be between 38 to 82 *** analysis revealed that the deposited thin films have good adherence to the substrate surfaces, are homogeneous and have high density. The average transmission of all films is up more than 65% in the range wavelength from 200 to 1100 nm and their band gap energy values were found between 3.5–3.92 e V. The obtained film thickness varies from 390 to 1040 nm. Moreover, the electric resistivity of the deposited films increases with the increasing of the solution flow rate between 3.51 × 10^5 and 11 × 10^5 Ω·cm.

关键词： zinc sulphide X-ray diffraction ultrasonic spray solution flow rate optical and electrical properties