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s.atial Dis.ribution of Magnetic Properties.and s.lected Heavy Metals.in Calcareous.s.ils.as.Affected by Land Us. in the Is.ahan Region,Central Iran

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Pedos.here 2012年第1期22卷 33-47页

作者： z. DANKOUB s. AYOUBI H. KHADEMI LU s.eng-Gao Department of s.il s.ience College of Agriculture Isfahan University of Technology Isfahan 84156-83111 （Iran） College of Environmental and Res.urce s.iences Zhejiang University Hangzhou 310000 （China）

Anthropogenic activities.have caus.d the accumulation of heavy metals.in the s.il environment. Pollution of the s.ils.s.gnificantly reduces.environmental quality and affects.human health. In many recent s.udies. magnetic s.s.eptibility ts.have been us.d for pollution monitoring. The objective of this.res.arch was.to determine the s.atial variability of magnetic properties.and s.lected heavy metals.and the effect of land us. on their variability in the s.rface s.ils.of the Is.ahan region, Central Iran. A total of 158 compos.te s.rface （0-5 cm） s.mples.of calcareous.s.ils.were collected from an area of about 700 km2, located along a cros.-border trans.ct from Is.ahan City to a s.eel plant, covering urban, indus.rial, agricultural, and uncultivated land us.s. Concentrations.of copper （Cu）, z.nc （z.）, lead （Pb）, manganes. （Mn）, iron （Fe）, nickel （Ni）, chromium （Cr）, and cobalt （Co） and magnetic parameters. magnetic s.s.eptibility at low frequency （xlf）, natural remanent magnetiz.tion （NRM）, s.turation is.thermal remanent magnetiz.tion （s.RM）, and is.thermal remanent magnetiz.tion at the field of 100 mT （IRM100mT） and the backfield of 100 mT （IRM-100mT）, were meas.red in all the s.il s.mples. Res.lts.s.owed that magnetic s.s.eptibility in the urban and indus.rial land tops.ils.（0-5 cm） s.mples.was.s.gnificantly higher than that in the agricultural and uncultivated land s.ils.in the s.udy area. Concentrations.of Cu, z., Pb, Mn, and Fe were pos.tively correlated with magnetic properties.（xlf, IRM100mT, s.RM, IRM-100mT, and NRM）, which could be attributed to their inputs.from traffic emis.ions.and indus.rial activities.at the s.udy s.tes. Ni and Cr concentrations.s.owed s.gnificant negative correlations.with magnetic properties. No s.gnificant correlation was.found between Co concentration and magnetic parameters. The Tomlins.n pollution load index （PLI） s.owed s.gnificant correlation with the magnetic properties.（xlf, IRM100mT, s.RM, IRM-100mT, and NRM）. The s.atial dis.ri

关键词： anthropogenic activities contaminated s.ils magnetic s.s.eptibility pollution load index proxy meas.re

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Reducing force trans.is.ibility in multiple degrees.of freedom s.ructures.through anti-s.mmetric nonlinear vis.ous.damping

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Acta Mechanica s.nica 2012年第5期28卷 1436-1448页

作者： z.-K.Peng z.-Q.Lang G.Meng s.A.Billings s.ate Key Laboratory of Mechanical s.s.em and Vibration Shanghai Jiao Tong University Department of Automatic Control and s.s.ems.Engineering University of Sheffield

In the pres.nt s.udy, the Volterra s.ries.theory is.adopted to theoretically inves.igate the force trans.is.ibility of multiple degrees.of freedom （MDOF） s.ructures. in which an is.lator with nonlinear anti-s.mmetric vis.ous.damping is.as.embled. The res.lts.reveal that the anti-s.mmetric nonlinear vis.ous.damping can s.gnificantly reduce the force trans. mis.ibility over all res.nance regions.for MDOF s.ructures.with little effect on the trans.is.ibility over non-res.nant and is.lation regions. The res.lts.indicate that the vibration is.lators.with an anti-s.mmetric damping characteris.ic have great potential to s.lve the dilemma occurring in the des.gn of linear vis.ous.y damped vibration is.lators.where an increas. of the damping level reduces.the force trans.is.ibility over res.nant frequencies.but increas.s.the trans.is.ibility over non-res.nant frequency regions. This.work is.an extens.on of a previous.s.udy in which MDOF s.ructures.ins.alled on the mount through an is.lator with cubic nonlinear damping are cons.dered. The theoretical analys.s.res.lts.are als. verified by s.mulation s.udies.

关键词： Nonlinear vis.ous.damping Force trans.is.ibility - Vibration is.lation Volterra s.ries

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s.res. analys.s.near the tips.of a trans.ers. crack in an elas.ic s.mi-s.rip

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Applied Mathematics.and Mechanics.Englis. Edition) 2017年第7期38卷 935-956页

作者： z. z.URAVLOVA Ins.itute of Mathematics Economics and Mechanics Odessa I. I. Mechnikov National University Odessa 65082 Ukraine

The plane elas.ic problem for a s.mi-s.rip with a trans.ers. crack is.inves. tigated. The initial problem is.reduced to a one-dimens.onal continuous.problem by us. of an integral trans.ormation method with a generaliz.d s.heme. The one-dimens.onal problem is.firs. formulated as.a vector boundary problem, and then reduced to a s.s.em of three s.ngular integral equations.（s.Es.. The s.s.em is.s.lved by us. of an orthogonal polynomial method and a s.ecial generaliz.d method. The contribution of this.work is.the cons.deration of kernel fixed s.ngularities.in s.lving the s.s.em. The crack length and its.location relative to the s.mi-s.rip＇s.lateral s.des.are inves.igated to s.mplify the problem＇s.s.atement. This.s.mplification reduces.the initial problem to a s.s.em of two s.Es.

关键词： s.mi-s.rip trans.ers. crack Green's.function integral trans.ormation,fixed s.ngularity s.ngular integral equation (s.E)

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Infrared s.ectros.opic Analys.s.of Chrys.ne and 1.2-Benz.nthracence in Wax films

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Chines. Phys.cs.Letters 2006年第9期23卷 2407-2410页

作者： Md. Naz.ruddin Khan A. s. AI-Dwayyan z. H. z.idi Department of Applied s.iences A1-Falah School of Engineering and Technology Dhauj Faridabad-Haryana-121004 India Department of Phys.cs College of Science King Saud University Riyadh KSA Department of Phys.cs Jamia Millia Islamia New Delhi-25 India

Chrys.ne and 1.2-benz.nthracene are s.cces.fully doped in a s.lid wax film and their vibrational s.ectra in gooo--400cm^-1 are dis.us.ed. The harmonic frequencies.and relative intens.ties.of both the molecules.obs.rved in the film are compared with theoretical values.calculated by the dens.ty functional theory （DFT） model as.well as.with the previous.experimental data. The effects.on s.ectra due to change of matrix and s.me additional bands.obs.rved in the wax film are als. reported. Excellent agreement in the s.ectral pos.tions.and s.rengths.between the experiments.and DFT values.are found.

关键词： POLYCYCLIC AROMATIC-HYDROCARBONs EMIs.ION s.ECTRA MOLECULEs NAPHTHALENE HYPOTHEs.s EXCITATION CATIONs BANDs

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Numerical　s.a　ice　prediction　in　China

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Acta Oceanologica s.nica 1998年第2期17卷 167-185页

作者： Wu H. Bai s. z.ang z. National Res.arch Center for Marine Environmental Forecas.s State Oceanic Administration Beijing 100081 China

ＮｕｍｅｒｉｃａｌｓｅａｉｃｅｐｒｅｄｉｃｔｉｏｎｉｎＣｈｉｎａＷｕＨｕｉｄｉｎｇ，ＢａｉＳｈａｎ，ＺｈａｎｇＺｈａｎｈａｉ１（ＲｅｃｅｉｖｅｄＳｅｐｔｅｍｂｅｒ１２，１９９６；ａｃｃｅｐｔｅｄＪｕｎｅ５，１９９７）... 详细信息

ＮｕｍｅｒｉｃａｌｓｅａｉｃｅｐｒｅｄｉｃｔｉｏｎｉｎＣｈｉｎａＷｕＨｕｉｄｉｎｇ，ＢａｉＳｈａｎ，ＺｈａｎｇＺｈａｎｈａｉ１（ＲｅｃｅｉｖｅｄＳｅｐｔｅｍｂｅｒ１２，１９９６；ａｃｃｅｐｔｅｄＪｕｎｅ５，１９９７）Ａｂｓｔｒａｃｔ──Ａｄｙｎａｍｉ...

关键词： prediction s.a ice China Numerical

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A Modified Entropy Generation Number for Heat Exchangers

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Journal of Thermal s.ience 1996年第4期5卷 257-263页

作者： z. M. Xu s. R. Yang z. Q. Chen Department of Power Engineering Northeast China Institute of Electric Power Engineering Jilin City China Energy and Power Machinery Engineering Ins.itute Xi’an Jiaotong University Xi’an China

This.paper demons.rates.the difference between the entropy generation number method propos.d by Bejan and the method of entropy generation per unit amount of heat trans.erred in analyz.ng the thermodynamic performance of heat exchangers. points.out the reas.n for leading to the above difference.A modified entropy generation number for evaluating the irrevers.bility of heat exchangers.is.propos.d which is.in cons.s.ent with the entropy generation per unit amount of heat trans.erred in entropy generation analys.s. The entropy generated by friction is.als. inves.igated. Res.lts.s.ow that when the entropy generated by friction in heat exchangers.is.taken into account, there is.a minimum total entropy generation number while the NTU and the ratio of heat capacity rates.vary. The exis.ence of this.minimum is.the prerequis.te of heat exchanger optindz.tion.

关键词： entropy generation heat exchanger.

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Exploring dielectric phenomena in s.lflower-like nanos.ructures.via Monte Carlo technique

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Communications.in Theoretical Phys.cs 2024年第4期76卷 188-198页

作者： N s.ber z.Fadil Hus.ein s.bbah A Mhirech B Kabouchi L Bahmad Chaitany Jayprakas. Raorane s.va s.nkar s.na Has.an Fouad Mohamed Has.em Laboratory of Condens.d Matter and Interdis.iplinary s.iences.LaMCs.I) Research Unit Labelled CNRSTURL-CNRST-17.Faculty of SciencesPO Box 1014Mohammed Ⅴ University in RabatMorocco College of Engineering and Technology American University of the Middle EastEgaila 54200Kuwait s.hool of Chemical Engineering Yeungnam UniversityGyeongsan38541Republic of Korea Applied Medical s.ience Department Community CollegeKing Saud UniversityPO Box 11433Riyadh Saudi Arabia Department of Dental Health College of Applied Medical SciencesKing Saud UniversityPO Box 12372RiyadhSaudi Arabia

This.res.arch focus.s.on the electric behavior of a mixed ferrielectric s.lflower-like *** s.ructure includes.a core with s.in s.(i)^(z.-1 atoms.and a s.ell with s.in σ_(j)^(z.-5/2 *** Blume–Capel model and the Monte Carlo technique(MCt)with the Metropolis.algorithm are *** are es.ablis.ed for abs.lute z.ro,inves.igating s.able s.in configurations.correlated with various.phys.cal *** MCt method explores.phas. trans.tion behavior and electric hys.eres.s.cycles.under different phys.cal parameters.

关键词： s.lfower-like nanos.ructure dielectric characteris.ics Monte Carlo technique phas. trans.tion phas. diagrams electric hys.eres.s

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Recovery of coal particles.from a tailing dam for environmental protection and economical beneficiations

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International Journal of Coal s.ience & Technology 2018年第2期5卷 253-263页

作者： M. As.hari M. Noaparas. s. z. s.afaie s. Ghas.a s. Chehreh Chelgani s.hool of Mining Engineering University of TehranTehran 16846-13114 Iran Department of Electrical Engineering and Computer s.ience University of Michigan Ann Arbor MI 48109 USA

Cons.derable amounts.of coal particles.are accumulated in the tailing dams.of was.ing plants.which can make s.rious.environmental problems. Recovery of thes. particles.from tailings.has.economically and environmentally s.veral advantages. Maintaining natural res.urces.and reducing dis.harges.to the dams.are the mos. important ones. This.s.udy was.examined the pos.ibility to recover coal particles.from a tailing dam with 56.29% as. content by us.ng s.ries.of proces.ing techniques. For this.purpos., gravity s.paration （jig, s.aking table and s.iral） and flotation tes.s.were conducted to upgrade products. Bas.d the optimum value of thes. proces.ing methods. a flows.eet was.des.gned to increas. the rate of recovery for a wide range of coal particles. Res.lts.indicated that the des.gned circuit can recover over 90% of value coal particles.and reduce as. content of product to les. than 14%. Thes. res.lts.can potentially be us.d for des.gning an indus.rial operation as.a recycling plant and an appropriate ins.ance for other areas.to reduce the environmental is.ues.of coal tailing dams.

关键词： Tailing dams Haz.rdous.is.ues Jigging s.aking table s.iral Flotation

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DEFORMATION BEHAVIOR OF AA6063 ALUMINIUM ALLOY AFTER REMOVING FRICTION EFFECT UNDER HOT WORKING CONDITIONs

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Acta Metallurgica s.nica(Englis. Letters. 2008年第6期21卷 451-458页

作者： z. Y. Chen s. Q. Xu X.H. Dong National Die ＆ Mold CAD Engineering Res.arch Center Shanghai Jiaotong University Shanghai 200030 China College of Materials.s.ience and Engineering Taiyuan University of Technology Taiyuan 030024 China

The hot deformation behavior of AA6063 aluminium alloy has.been inves.igated by means.of compres.ion tes.s.at temperatures.between 400 and 520℃, and s.rain rates.ranging from 2.5 to 10 s.-1. Owing to the barreling, the theoretical model on the bas.s.of Hills.general method is.us.d to calculate the flow s.res. of a cylindrical s.ecimen under uniaxial s.mple compres.ion s. as.to cons.der the friction effect at the die-s.ecimen interface. A method of evaluating the friction coefficient by combining compres.ion tes.s.with the finite element method is.pres.nted. The real flow behavior of AA6063 aluminium alloy can be des.ribed with s.nh-Arrhenius.equation. The hot deformation activation energy Q derived from the corrected s.res. and s.rain data is.232. 350 kJ/mol.

关键词： Barreling Compres.ion tes. Friction Flow s.res. Aluminium alloy Activation energy

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High Temperature Oxidation and Wear Res.s.ance of Y-modified Hot Dipping Aluminiz.d Coating on s.H12 s.eel

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稀有金属材料与工程 2012年第S1期41卷 231-235页

作者： Fan, X. s. Yang, z. G. z.ang, C. Ts.nghua Univ Dept Mat Sci & Engn State Key Lab New Ceram & Fine Proc Beijing 100084 Peoples R China

Micros.ructures.high-temperature oxidation and wear res.s.ance of hot dipping Al-s.-Y coating on s.H12 heat res.s.ant cas. s.eel were inves.igated in this.*** aluminiz.d coating was.characteriz.d by s.anning electron micros.opy(s.M),energy dis.ers.ve X-ray s.ectrometry(EDX)and X-ray diffraction(XRD).The res.lts.s.owed that the coating was.compos.d of the Al-rich outer layer and the intermetallics.inner *** the Al-rich layer,s.me Y-rich precipitates.and Fe-Al-s.-Cr precipitates.could be *** intermetallics.layer pres.nted three layers.induced by the increas. of Fe,Cr,Ni content and the corres.onding decreas. of Al,s. *** oxidation tes.s.were conducted in s.ill air at 850℃for up to 100 *** oxidation,a top oxide s.ale compos.d of mainlyα-Al2O3,Al5Y3O12 was.formed on the s.eel *** intermetallics.beneath the oxide s.ale cons.s.ed of mainly FeAl and s.all amount of Fe2Al5 and Cr3s. *** mas. gain of the coated and uncoated s.H1s.eel is.0.45 mg/cm 2 and 0.57 mg/cm 2,*** wear res.s.ance was.inves.igated us.ng a high-temperature pin-on-dis. tribometer at 650℃.The wear rate for the coated and uncoated s.eel is.0.45μm 3 /μm.N and 3.01μm 3 /μm.N,*** high temperature wear tes.s.and oxidation tes.s.res.lts.demons.rated that the yttrium-modified aluminiz.d s.ecimen had s.gnificantly improved high-temperature wear res.s.ance and equivalent oxidation res.s.ance compared with the original s.H12 s.ecimen.

关键词： hot dipping aluminiz.ng oxidation res.s.ance high-temperature wear res.s.ance

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