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Comparison of Velocity Shear with Turbulence Reduction Driven by Biasing in a Simple Cylindrical Slab Plasma

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Plasma Science and Technology 2010年第4期12卷 391-396页

作者： k.W.GENTlE k.lIAO k.lEE W.l.ROWAN Institute of Fusion Studies University of Texas at Austin

In an experimental realization of the sheared cylindrical slab, the level of plasma turbulence is strongly reduced by application of a sufficient bias potential difference in the radial direction. Density fluctuation levels △nrms/n decrease by more than a factor of five. The ion flow velocity profile is measured spectroscopically from the Doppler shift of an argon ion line. Comparison of the shearing rates with the turbulent amplitudes as a function of bias show no relation between the shearing rate and turbulence reduction, contrary to expectations.

关键词： turbulence suppression shear stabilization velocity shear bias

Enhanced mechanical performance of grain boundary precipitation-hardened high-entropy alloys via a phase transformation at grain boundaries

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Journal of Materials Science & Technology 2021年第27期86卷 271-284页

作者： Y.l.Qi l.Zhao X.Sun h.X.Zong X.D.Ding F.Jiang h.l.Zhang Y.k.Wu l.he F.liu S.B.Jin G.Sha J.Sun State key laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an710049China Analytical&Testing Center Northwestern Polytechnical UniversityXi’an710072China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing210094China

Grain-boundary(GB)precipitation has a significant adverse effect on plasticity of alloys,which easily leads to catastrophic intergranular failure in safety-critical applications under high external ***,we report a novel strategy that uses the local stress concentration induced by GB precipitates as a driving force to trigger phase transformation of preset non-equiatomic high-entropy solid-solution phase at *** in situ deformation-induced phase transformation at GBs introduces a well-known effect:transformation-induced plasticity(TRIP),which enables an exceptional elongation to fracture(above 38%)at a high strength(above 1.5 GPa)in a GB precipitation-hardened high-entropy alloy(hEA).The present strategy in terms of"local stress concentration-induced phase transformations at GBs"may provide a fundamental approach by taking advantage of(rather than avoiding)the GB precipitation to gain a superior combination of high strength and high ductility in hEAs.

关键词： Non-equiatomic Grain-boundary precipitation high-entropy alloys Ductility Transformation-induced plasticity

Guidance on Design of Internet-based Process Control Systems

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自动化学报 2005年第1期31卷 56-63页

作者： S.h.YANG l.YANG ComputerScienceDepartment LoughboroughUniversityLoughboroughLeicestershireLE113TUUK

Internet-based process control is becoming new generations of control systems, in which the Internet is used as a platform for global remote monitoring and control. The obvious benefit is to enable global collaboration between operators from geographically dispersed locations, data sharing and data provision for remote monitoring and control. however, connection to an open network and the use of universal technology present new problems that did not exist with the conventional design and construction of control systems, such as time delay and data loss in Internet transmission and security. This paper reviews the latest research results and presents design guidance of Internet based monitoring and control systems.

关键词：网络等待时间安全性用户界面设计互联网远程监控

Controllable synthesis, XPS investigation and magnetic property of multiferroic BiMn2O5 system: The role of neodyme doping

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Progress in Natural Science:Materials International 2019年第2期29卷 198-209页

作者： h.Felhi M.Smari A.Bajorek k.Nouri E.Dhahri l.Bessais Applied Physics laboratory Sfax Faculty of Sciences University of Sfax Center for Functionalized Magnetic Materials (FunMagMa) Immanuel Kant Baltic Federal University A.Che?kowski Institute of Physics University of Silesia in Katowice Silesian Center for Education and Interdisciplinary Research University of Silesia in Katowice CMTR ICMPE UMR 7182 CNRS-UPEC

In this work, a novel series of multiferroic materials BiMn2O5doped by Neodyme has been prepared by a sol-gel method at low temperature. The crystallographic studies using X-ray diffraction and Rietveld Refinement techniques showed the formation of single-phase samples for all compositions, crystallizing in a mullite-type orthorhombic perovskite structure, space group Pbam(Z = 4). The SEM techniques confirmed the formation of single-phase materials with excellent mapping distribution. Raman and infrared spectroscopic measurements were performed and combined with lattice dynamics simulations to describe the room-temperature vibrational properties of all samples. The X-ray Photoelectron Spectroscopy(XPS) were measured in the energy range of 0–1400 eV at room temperature. The Fermi level EFwas defined with the accuracy of 0.127, 0.32 and 0.48 eV for BiMn2O5, Bi0.9Nd0.1Mn2O5and Bi0.8Nd0.2Mn2O5respectively. The X-ray photoelectron spectroscopy shows the existence of Mn4+state. Magnetic measurements indicate Neél temperature TNat 31, 40 and 61 k for BiMn2O5,Bi0.9Nd0.1Mn2O5and Bi0.8Nd0.2Mn2O5respectively.

关键词： Multiferroics X-ray photoelectron spectroscopy Fermi level Magnetic properties

Distribution of Be in a Ti-Based Bulk Metallic Glass Composite Containing B-Ti

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Journal of Materials Science & Technology 2017年第7期33卷 708-711页

作者： l.Zhang W.Q.li Z.W.Zhu h.M.Fu h.li Z.k.li h.W.Zhang A.M.Wang h.F.Zhang Shenyang National laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences 110016 Shenyang China

In order to obtain a glassy matrix during quenching, Be is often selected as a constituent of the compositions of Ti/Zr-based bulk metallic glass composites（BMGCs）. The in situ formed β phase in Be-bearing BMGCs was reported to be Be-free. however, a thorough investigation of the distribution of Be in BMGCs is still missing to date. In this work, the distribution of Be in a Ti_（47.5）Zr_（33）Cu_（5.8）Co_3Be_（12.5）（at.%） BMGC was studied by the secondary ion mass spectrometry（SIMS） and the electron energy loss spectroscopy（EElS）.It is found that Be almost totally dissolves in the glassy matrix, but a very weak intensity of Be in β phase is still detectable by SIMS, and the content of Be in β-Ti is estimated to be about 0.3 at.%. Based on the recently established two-phase quasi-equilibrium of BMGCs, the distinct solubility of Be in the glassy matrix and in β-Ti has been explained.

关键词： Bulk metallic glass(BMG) Metallic glass composite Beryllium Quasi-equilibrium

Petrology and Geochemistry of Post-Collisional Early Miocene Volcanism in the karacadag Area(Central Anatolia,Turkey)

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Acta Geologica Sinica(English Edition) 2011年第5期85卷 1100-1117页

作者： krsad ASAN hseyin kURT Department of Geological Engineering Selcuk University

Early Miocene（ca.21-18 Ma） volcanism in the karacadag area comprises three groups of volcanic rocks:（1） calcalkaline suite（andesitic to rhyolitic lavas and their pyroclastics）,（2） mildly-alkaline suite（alkali basalt,hawaiite,mugearite,benmoreite and trachydacite）,and（3） a single trachyandesitic flow *** observations,40Ar/39Ar ages and geochemical data show that there was a progressive temporal transition from group 1 to 3 in a post-collisional tectonic *** calcalkaline suite rocks with medium-k in composition resemble those of subduction-related lavas, whereas the mildly-alkaline suite rocks having a sodic tendency（Na2O/k2O=l.5-3.2） resemble those of within-plate *** element and Sr-Nd isotopic characteristics of the suites suggest that the lithospheric mantle beneath the karacadag area was heterogeneously enriched by two processes before collision:（1） enrichment by subduction-related processes,which is important in the genesis of the calcalkaline volcanism,（2） enrichment by small degree melts from the astenosphere,which dominates the mildly alkaline *** of the enriched lithosphere by either delamination following collision and uplift or removal of the subducted slab following subduction and collision（i.e.,slab breakoff） is the likely mechanism for the initiation of the post-collision volcanism.

关键词： post-collision calcalkaline Sr-Nd isotopes karacadag Central Anatolia

Instability of relativistic electron beam with strong magnetic field

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Chinese Science Bulletin 2000年第1期45卷 18-23页

作者： h.l.Berk Institute for Fusion Studies University of Texas at AustinAustinTX 78712-1060USA

Stability criteria for a weak relativistic beam-plasma interaction in a strong magnetic field are found. Two beam modes occur, ω≈kzc and ω≈kzc-ωc. The dispersion equation of electrostatic two-stream is exactly so... 详细信息

关键词： instability relativistic electron beam two-stream strong magnetic field dispersion relation.

Preparation of sulfur hydrophobized plasmonic photocatalyst towards durable superhydrophobic coating material

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Journal of Materials Science & Technology 2020年第6期41卷 159-167页

作者： Emese lantos lászlóMérai ágota Deák Juan Gómez-Pérez Dániel Sebo?k Imre Dékány Zoltán kónya lászlóJanovák University of Szeged Interdisciplinary Excellence CentreDepartment of Physical Chemistry and Materials ScienceH-6720Rerrich Béla tér 1SzegedHungary University of Szeged Interdisciplinary Excellence CentreDepartment of Applied and Environmental ChemistryH-6720Rerrich Béla tér 1SzegedHungary

The widely used photocatalytic self-cleaning coating materials are often made of polymers and polymer based composites,where the photocatalyst immobilization occurs with ***,these organic polymers are often unstable under exposure to UV irradiation and easily degraded by reactive radicals produced in the photocatalytic *** order to solve this problem,in this paper,we present the facile preparation of a multifunctional coating with dual superhydrophobic and photocatalytic properties,where the fixation and the hydrophobization of the plasmonic Ag-TiO2 photocatalyst particles with visible light activity was performed with non-water soluble sulfur,which is a cheap and easily available *** resulted novel nanocomposite with rough and nano-tructured surface roughness(1.25–2.45 nm determined by small-angle X-ray scattering)has sufficient low surface energy(3.3 mJ/m2)for superhydrophobic(θ=151.1°v)***,in contrast of the organic and expensive fluoropolymer based composites,this non-wetting nature was durable,because the measured was higher than 150°during the long-term lED(λmax=405 nm)light irradiation.

关键词： Nanocomposite Coating materials Wetting lotus-type structure Visible light photocatalyst

Application of high silica zeolite ZSM-5 in a hybrid treatment process based on sequential adsorption and ozonation for VOCs elimination

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Journal of Environmental Sciences 2016年第3期28卷 59-68页

作者： hicham Zaitan Marie hélène Manero héctor Valdés laboratoire de Chirmie de la Matiere Condensee(lCMC) Faculte des Sciences et TechniquesUniversite Sidi Mohamed Ben AbdellahB.P.2202FesMaroc Universite de Toulouse INPTUPSLaboratoire de Genie Chimique4Allee Emile MonsoF-31030 ToulouseFrance CNRS Laboratoire de Genie ChimiqueF-31030 ToulouseFrance laboratorio de Tecnologias limpias(F.Ingenieria) Universidad Catolica de la Santisima ConcepcionAlonso de Ribera 2850ConcepcionChile

In this study,a hydrophobic synthetic zeolite,namely ZSM-5 is chosen as an adsorbent/catalyst for toluene *** results showed that toluene adsorption onto ZSM-5 was favourable,following a langmuir adsorption isotherm ***-5 zeolite was regenerated using gaseous ozone at low *** toluene was oxidised,releasing mainly CO_2 and h_*** of oxidation by-products such as acetic acid and acetaldehyde were formed and remained adsorbed after the oxidativate regeneration with *** four successive cycles of adsorption/ozonation,the adsorption efficiency was not affected（92%-99%）.These results showed that volatile organic compound（VOC）removal by adsorption onto ZSM-5 zeolite followed by ozone regeneration could be used as a promising hybrid process for the control of VOC emissions in terms of efficiency.

关键词： Adsorption Ozone Toluene VOCs Zeolite