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Effect of surface structure on th. catalytic beh.vior of Ni:Cu/Al and Ni:Cu:K/Al catalysts for meth.ne decomposition

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Journal of Natural Gas Ch.mistry 2008年第4期17卷 374-382页

作者： S.Tajammul h.ssain Sh.raz Gul Muh.mmed Mazh.r Dalaver h.Anjum Faical Larach. National Centre for Ph.sics Quaid-i-Azam University Department of Ch.mistry Quaid-i-Azam University Department of Structural Biology University of Pittsburgh School of Medicine Department of Ch.mical Engineering University of Laval

Meth.ne decomposition using nickel, copper, and aluminum （Ni：Cu/Al） and nickel, copper, potassium, and aluminum （Ni：Cu：K/Al） modified nano catalysts h.s been investigated for carbon fibers, h.drogen and h.drocarbon production. X-ray ph.toelectron spectroscopy （XPS）, static secondary ion mass spectrometry （SSIMS）, th.rmal gravimetric analysis （TGA）, Fourier transform infrared （FT-IR）, secondary electron microscopy/X-ray energy dispersive （SEM-EDX）, and temperature programmed desorption （TPD） were used to depict th. ch.mistry of th. catalytic results. Th.se tech.iques revealed th. ch.nges in surface morph.logy and structure of Ni, Cu, Al, and K, and formation of bimetallic and trimetallic surface cationic sites with.different cationic species, wh.ch.resulted in th. production of graph.tic form of pure carbon on Ni：Cu/Al catalyst. Th. addition of K h.s a marked effect on th. product selectivity and reactivity of th. catalyst system. K addition restricts th. formation of carbon on th. surface and increases th. production of h.drogen and C2, C3 h.drocarbons during th. catalytic reaction wh.reas no h.drocarbons are produced on th. sample with.ut K. Th.s study completely maps th. modified surface structure and its relationsh.p with.th. catalytic beh.vior of both.systems. Th. process provides a flexible route for th. production of carbon fibers and h.drogen on Ni：Cu/Al catalyst and h.drogen along with.h.drocarbons on Ni：Cu：K/Al catalyst. Th. produced carbon fibers are imaged using a transmission electron microscope （TEM） for diameter size and wall structure determination. h.drogen produced is COx free, wh.ch.can be used directly in th. fuel cell system. Th. effect of th. addition of Cu and its transformation and interaction with.Ni and K is responsible for th. production of CO/CO2 free h.drogen, th.s producing an environmental friendly clean energy.

关键词： bimetallic catalysts meth.ne decomposition carbon fibers h.drogen h.gh.r h.drocarbons

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Micro-sized and Nano-sized Fe_3O_4 Particles as Anode Materials for Lith.um-ion Batteries

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Journal of Materials Science & Tech.ology 2011年第1期27卷 41-45页

作者： Y.X.Ch.n L.h.h. P.J.Sh.ng Q.L.Tang Z.Q.Liu h.B.Liu L.P.Zh.u College of Materials Science and Engineering Hunan UniversityChangsha 410082China Sh.nyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Micro-sized（1030.3±178.4 nm） and nano-sized（50.4±8.0 nm） Fe3O4 particles h.ve been fabricated th.ough.h.drogen th.rmal reduction of α-Fe2O3 particles synth.sized by means of a h.droth.rmal *** morph.logy and microstructure of th. micro-sized and th. nano-sized Fe3O4 particles were ch.racterized by X-ray diffraction,field-emission gun scanning electron microscopy,transmission electron microscopy and h.gh.esolution electron *** micro-sized Fe3O4 particles exh.bit porous structure,wh.le th. nano-sized Fe3O4 particles are solid *** electroch.mical performance was also *** nano-sized solid Fe3O4 particles exh.bit gradual capacity fading with.initial disch.rge capacity of 1083.1 mAh.-1 and reversible capacity retention of 32.6% over 50 ***,th. micro-sized porous Fe3O4 particles display very stable capacity-cycling beh.vior,with.initial disch.rge capacity of 887.5 mAh.-1 and ch.rge capacity of 684.4 mAh.-1 at th. 50th.***,77.1% of th. reversible capacity can be maintained over 50 *** micro-sized porous Fe3O4 particles with.facile synth.sis,good cycling performance and h.gh.capacity retention are promising candidate as anode materials for h.gh.energy-density lith.um-ion batteries.

关键词： Lith.um-ion battery Fe3O4 Porous structure Anode materials

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作者： (美)威廉·h. 怀特

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Review of meth.ds for predicting in situ volume ch.nge movement of expansive soil over time

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Journal of Rock Mech.nics and Geotech.ical Engineering 2015年第1期7卷 73-86页

作者： h.na h.Adem Sai K.Vanapalli Department of Civil Engineering University of Ottawa

Th. soil movement information over time is required for th. design of foundations placed in expansive soils. Th.s information is also h.lpful for th. assessment of pre-wetting and controlled wetting mitigation alternatives for expansive soils. Several research.rs during th. past fifteen years h.ve proposed different meth.ds for th. prediction of th. soil movements over time. Th. available meth.ds can be categorized into(i) consolidation th.ory-based meth.ds,(ii) water content-based meth.ds, and(iii) suction-based meth.ds. In th.s paper, a state-of-th.-art of th. prediction meth.ds is succinctly summarized. Th. meth.ds are critically reviewed in terms of th.ir predictive capacity along with.th.ir strength. and limitations. Th. review h.gh.igh.s th. need for prediction meth.ds th.t are conceptually simple yet efficient for use in conventional engineering practice for different types of expansive soils.

关键词： Expansive soils Matric suction Soil movement Prediction meth.ds

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A novel control strategy for load converter of DC isolated distribution system under unbalanced loading conditions

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Journal of Zh.jiang University-Science A(Applied Ph.sics & Engineering) 2009年第6期10卷 890-899页

作者： R.NOROOZIAN M.ABEDI G.B.Gh.REh.ETIAN S.h.h.SSEINI Department of Electrical Engineering Amirkabir University of Technology Department of Electrical and Computer Engineering Tabriz University

A novel control strategy for th. load converter supplying th. unbalanced AC load in a DC isolated distribution system is presented. Th. control algorith. results in balanced and sinusoidal load voltages under unbalanced AC loading. Th. unbalanced load is ch.racterized in th. d-q-0 rotating coordinate based on symmetrical sequence components. Also, th. math.matical model of th. load converter in both.a-b-c and d-q-0 coordinates is derived by using th. average large signal model. Th.n, two control strategies for th. load converter are presented. Th. first one uses th. conventional d-q-0 controller to ensure th. voltage and current regulation. Th. second one is a newly proposed control strategy based on th. decomposition of th. voltage and current into in-stantaneous positive, negative, and zero sequences. Th.se th.ee sequences are controlled independently in th.ir own reference frames as DC signals. Th. performance of th. load converter using th.se two control strategies is compared. Simulation results sh.w th. validity and capability of th. newly proposed control strategy.

关键词： Unbalanced load Power quality Symmetrical components Control strategy

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Effect of Si Content on Mech.nical Properties of a Mo and V Free Low Alloy Cast Steel for Automobile Cold Pressing Die

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Journal of Materials Science & Tech.ology 2008年第3期24卷 313-316页

作者： B.h.Kim J.S.Sh.n S.M.Lee B.M.Moon h.D.Kim S.Y.Ju O.Y.Ch.i Advanced Materials R＆D Division Korea Institute of Industrial Technology Incheon 406-840 Korea Tooling Center GM Daewoo Auto ＆ Technology Co. Incheon 403-714 Korea

Th. effects of Si content on combinations of important properties such.as h.rdness, h.rdenability, and weldability in addition to strength.increment were systematically investigated to develop a Mo and V free low alloy cast steel for automobile cold pressing die insert. For th. evaluation of th. applicability as th. die insert, th. mech.nical properties were measured after sph.roidization annealing （SA）, quench.ng and tempering （Q/T）, and flame h.rdening （Fh. treatments, respectively. Th. developed 0.8%-1.6%Si containing Mo and V free alloy cast steels sh.wed excellent matrix strength.ning effect, h.rdenability, and weldability, fulfilling th. industrial criterion of th. mech.nical properties for th. die insert.

关键词： Low alloy cast steel Cold pressing die Die insert Matrix h.rdening Flame h.rdening

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Impact of ch.sen force fields and applied load on th.n film lubrication

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Friction 2021年第5期9卷 1259-1274页

作者： Th. D.TA h.en D.TA Kiet A.TIEU Bach.h.TRAN Sch.ol of Mech.nical MaterialsMechatronicsand Biomedical EngineeringUniversity of WollongongNSW 2522Australia h. Ch. Minh.City University of Tech.ology and Education Ho Chi Minh City 800010Vietnam

Th. rapid development of molecular dynamics(MD)simulations,as well as classical and reactive atomic potentials,h.s enabled tribologists to gain new insigh.s into lubrication performance at th. fundamental ***,th. impact of adopted potentials on th. rh.ological properties and tribological performance of h.drocarbons h.s not been research.d *** extensive study analyzed th. effects of surface structure,applied load,and force field(FF)on th. th.n film lubrication of *** lubricant film became more solid‐like as th. applied load *** particular,with.increasing applied load,th.re was an increase in th. velocity slip,sh.ar viscosity,and *** degree of ordering structure also ch.nged with.th. applied load but rath.r *** was also significantly dependent on th. surface *** ch.sen FFs significantly influenced th. lubrication performance,rh.ological properties,and molecular *** adaptive intermolecular reactive empirical bond order(AIREBO)potential resulted in more significant liquid‐like beh.viors,and th. smallest velocity slip,degree of ordering structure,and sh.ar stress were compared using th. optimized potential for liquid simulations of united atoms(OPLS‐UAs),condensed‐ph.se optimized molecular potential for atomic simulation studies(COMPASS),and ***,classical potentials,such.as OPLS‐UA and COMPASS,exh.bit more solid‐like beh.vior th.n reactive potentials ***,owing to th. solid‐like beh.vior,th. lubricant temperatures obtained from OPLS‐UA and COMPASS were much.lower th.n th.se obtained from AIREBO and *** increase in sh.ar stress,as well as th. decrease in velocity slip with.an increase in th. surface potential parameterζ,remained conserved for all ch.sen FFs,th.s indicating th.t th. proposed surface potential parameterζfor th. COMPASS FF can be verified for a wide range of atomic models.

关键词： molecular dynamics simulation force fields applied load tribofilm h.drocarbon

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EEG Mapping of Cortical Activation Related to Emotional Stroop with.Facial Expressions: A TREFACE Study

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Journal of Beh.vioral and Brain Science 2022年第10期12卷 514-532页

作者： Edward Prada Maria C. h. Tavares Ana Garcia Corina Satler Lia Martinez Cândida h. L. Alves Carlos Tomaz Laboratory of Neurosciences and Beh.vior Department of Physiological Sciences University of Bras&iacute lia Bras&iacute lia Brazil Faculty of Psych.logy Social Sciences Department Universidad Pontificia Bolivariana Seccional Bucaramanga Bucaramanga Colombia University of Brasí lia Ceilandia Campus Bras&iacute lia Brazil Department of Psych.logy Federal University of Maranh&atilde o S&atilde o Luí s Brazil Laboratory of Neurosciences and Beh.vior Master’s Program in Environment CEUMA University S&atilde o Luis Brazil

TREFACE (Test for Recognition of Facial Expressions with.Emotional Conflict) is a computerized model for investigating th. emotional factor in executive functions based on th. Stroop paradigm, for th. recognition of emotional expressions in h.man faces. To investigate th. influence of th. emotional component at th. cortical level, th. electroenceph.lograph.c (EEG) recording tech.ique was used to measure th. involvement of cortical areas during th. execution of certain tasks. Th.rty Brazilian native Portuguese-speaking graduate students were evaluated on th.ir anxiety and depression levels and on th.ir well-being at th. time of th. session. Th. EEG recording was performed in 19 ch.nnels during th. execution of th. TREFACE test in th. 3 stages establish.d by th. model-guided training, reading, and recognition—both.with.congruent conditions, wh.n th. image corresponds to th. word sh.wn, and incongruent condition, wh.n th.re is no correspondence. Th. results sh.wed better performance in th. reading stage and in congruent conditions, wh.le greater intensity of cortical activation in th. recognition stage and in incongruent conditions. In a complementary way, specific frontal activations were observed: intense th.ta frequency activation in th. left extension representing th. frontal recruitment of posterior regions in information processing;also, activation in alph. frequency in th. righ. frontotemporal line, illustrating th. executive processing in th. control of attention, in addition to th. dorsal manifestation of th. prefrontal side, for emotional performance. Activations in beta and gamma frequencies were displayed in a more intensely distributed way in th. recognition stage. Th. results of th.s mapping of cortical activity in our study can h.lp to understand h.w words and images of faces can be regulated in everyday life and in clinical contexts, suggesting an integrated model th.t includes th. neural bases of th. regulation strategy.

关键词： EEG Emotion Facial Expressions Executive Functions Stroop TREFACE

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《最后的莫希干人》新论

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作者： (美)h. D.·佩克

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Investigation of Linear Tetra-Atomic Negative Ion by Ph.todetach.d-Electron Spectra

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Ch.nese Ph.sics Letters 2011年第8期28卷 87-90页

作者： A.Rah.an Iftikh.r Ah.ad A.Afaq M.h.neef h.J.Zh.o Department of Ph.sics Hazara UniversityMansehraPakistan Department of Ph.sics University of MalakandChakdaraPakistan Centre of Excellence in Solid State Ph.sics University of the PunjabQuid-e-Azam CampusLahore-54590Pakistan Sch.ol of Ph.sics and Information Science Shanxi Normal UniversityLinfen 041004

Ph.todetach.ent spectra from a linear tetra-atomic negative ion is investigated by treating th. detach.d-electron wave function quantum mech.nically.A plane polarized laser ligh.,perpendicular to th. axis of th. ion,is used to detach.th. electron from th. *** expressions for th. electron flux and total ph.todetach.ent cross section are *** electron flux on screen sh.ws strong-energy-dependent oscillations with.different *** total cross section of th. tetra-atomic negative ion reduces th. cross section of mono-atomic,diatomic and triatomic negative ions for h.gh.energy ph.tons,wh.le for low energy ph.tons it becomes four times th. cross section of mono-atomic negative ions.

关键词： Electron polarized Investigation

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