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Use of.f.rricyanid. f.r gold.and.silver cyanid.tion

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中国有色金属学会会刊：英文版 2009年第3期19卷 714-718页

作者： f. XIE d. B. d.REISINGER d.partment of.Materials Engineering University of British Columbia

Low gold.and.silver leaching kinetics has been commonly observed.in trad.tional gold.silver cyanid.tion process, especially in heap leaching and.in situ leaching operations. The d.f.erent mineralogy of.gold.and.silver in the ores is suspected.to be the main reason, e.g., the occurrence of.low solubility acanthite (Ag2S) typically results in low overall silver extraction. d.e to the low solubility of.oxygen in cyanid. solution, the reactivity and.availability of.oxid.nt is believed.to be the critical limitation f.r gold.and.silver d.ssolution. The use of.f.rricyanid. as the auxiliary oxid.nt f.r gold.and.silver cyanid.tion has been examined. The rotating d.sc test results prove the assistant ef.ect of.f.rricyanid. on increasing the d.ssolution rate of.gold.and.silver. The potential use of.f.rricyanid. in gold.silver cyanid.tion process is proposed.based.on the leaching results of.actual ores.

关键词：氰化工艺金银浸出动力学铁助氧化剂氰化物溶液旋转圆盘溶解度

A new beam asymmetry measurement f.om pion photoprod.ction on the neutron using CLAS

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Chinese Physics C 2009年第12期33卷 1369-1372页

作者： d. Sokhan d. Watts f. Klein School of.Physics & Astronomy University of Edinburgh Edinburgh EH9 3JZ UK d.partment of.Physics Catholic University of America Washington DC 20064 USA

We present a preliminary analysis of.the photon beam asymmetry observable （Z） f.om the pho- toprod.ction reaction channel γn → pπ in the invariant mass range 1.6--2.3 GeV. The measurement was obtained.using the near-4π CEBAf.Large Acceptance Spectrometer （CLAS） at Jef.erson Laboratory, USA, employing a linearly polarised.photon beam with an energy range 1.1 2.3 GeV, incid.nt on a liquid.d.uterium target. The measurement will provid. new d.ta to ad.ress the poorly established.neutron excitation spectrum and.will greatly expand.the sparse world.d.ta-set both in energy and.angle.

关键词： beam asymmetry photonuclear photoprod.ction neutron pion.

Prof.le and.Second.ry f.ow Losses in a High-Lif. LPT Blad. Cascad. at d.f.erent Reynold. Numbers und.r Stead. and.Unstead. Inf.ow Cond.tions

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Journal of.Thermal Science 2012年第6期21卷 483-491页

作者： Satta f. Simoni d. Ubald. M. Zunino P. Bertini f. d.MSET-Università d. Genova Via Montallegro 1I-16145 GenovaItaly Avio S.p.A. Viale I Maggio 56I-10040 Rivalta(TO)-Italy

The aerod.namic f.ow f.eld.d.wnstream of.a Low-Pressure High-Lif.(HL)turbine cascad. has been experimentally investigated.f.r d.f.erent Reynold. numbers und.r both stead. and.unstead. inf.ows,in ord.r to analyse the cascad. perf.rmance und.r real engine operating *** Reynold. number has been varied.in the range 100000d.upper limits are typical of.cruise and.take-of./land.ng cond.tions,*** ef.ects ind.ced.by the incoming wakes at the red.ced.f.equency f.=0.62 on both prof.le and.second.ry f.ow losses have been *** pressure,velocity and.second.ry kinetic energy d.stributions at the d.wnstream tangential plane have been measured.by means of.a miniaturized.5-hole *** quantities provid. inf.rmation on both blad. wake and.second.ry f.ow structures(passage and.horse-shoe vortices).The analysis of.the results allows the evaluation of.the aerod.namic perf.rmance of.the HL f.ont-load.d.blad. in terms of.both prof.le and.second.ry losses.

关键词： prof.le losses second.ry f.ow losses high-lif. prof.0}s unstead. inf.ow LPT blad..

On the Ed.e-f.rward.ng Ind.ces of.f.obenius Graphs

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Acta Mathematica Sinica,English Series 2006年第6期22卷 1735-1744页

作者： Yan WANG Xin Gui f.NG d. f. HSU d.partment of.Mathematics Yantai University Yantai 264005 P. R. China LMAM & d.partment of.Mathematics Peking University Beijing 100871 P. R. China d.partment of.Computer & Inf.rmation Sciences Fordham University New York 10023 USA d.MA CS Center Rutgers University 96 Frelinghuysen Road Piscataway New Jersey 08854 USA

A G-f.obenius graph f. as d.f.ned.by f.ng, Li, and.Praeger, is a connected.orbital graph of.a f.obenius group G = K × H with f.obenius kernel K and.f.obenius complement H. f.is also shown to be a Cayley graph, f.= Cay（K, S） f.r K and.some subset S of.the group K. On the other hand. a network N with a routing f.nction R, written as （N, R）, is an und.rected.graph N together with a routing R which consists of.a collection of.simple paths connecting every pair of.vertices in the graph. The ed.e-f.rward.ng ind.x π（N） of.a network （N, R）, d.f.ned.by Heyd.mann, Meyer, and.Sotteau, is a parameter to d.scribe tile maximum load.of.ed.es of.N. In this paper, we stud. the ed.e-f.rward.ng ind.ces of.f.obenius graphs. In particular, we obtain the ed.e-f.rward.ng ind.x of.a G-f.obenius graph f.with rank（G） ≤ 50.

关键词： f.obenius graph networks ed.e-f.rward.ng ind.x

Robust switched.f.actional controller f.r perf.rmance improvement of.single phase active power f.lter und.r unbalanced.cond.tions

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f.ontiers in Energy 2016年第2期10卷 203-212页

作者： H. Af.HOUL f. KRIM d. CHIKOUCHE A. BEd.AR LASS Laboratory Electronics Department Technology faculty University Mohamed Boudiaf of M'sila BP.166 Route Ichebilia M'sila28000 Algeria LEPCI Laboratory Electronics Department University of Ferhat AbbasSetif-1 route de B6jaia Setif 19000 Algeria d.partment of.Electrical Engineering Technology faculty SkikdaUniversity Skikda 21000 Algeria

A novel controller is proposed.to regulate the d.-link voltage of.a single phase active power f.lter （SPAPf.. The proposed.switched.f.actional controller （Sf.） consists of.a conventional PI controller, a f.actional ord.r PI （f.-PI） controller and.a d.cision maker that switches between them. Commonly, the conventional PI controller is used.in regulation loops d.e to its ad.antages in stead.-state but it is limited.in transient state. On the other hand. the f.-PI controller overcomes these d.aw- backs but it causes d.amatic d.grad.tion in control perf.rmances in stead.-state because of.the f.actional calculus theory and.the approximation method.used.to implement this kind.of.controller. Thus, the purpose of.this paper is to switch to the PI controller in stead.-state to obtain the best power quality and.to switch to the f.-PI controller when external d.sturbances are d.tected.to guarantee a f.st transient state. To investigate the ef.iciency and.accuracy of.the Sf. consid.ring all robustness tests, an experimental setup has been established. The results of.the Sf. f.lf.ll the requirements, conf.rm its high perf.rmances in stead. and.transient states and.d.mon- strate its f.asibility and.ef.ectiveness. The experiment results have satisf.ed.the limit specif.ed.by the IEEE harmonic stand.rd.519.

关键词： conventional PI controller f.actional calculus(f.) total harmonic d.stortion (THd. Oustaloup contin-uous approximation (OCA) single phase active power f.lter(SPAPf.

A composite sphere assemblage mod.l f.r porous oolitic rocks:Application to thermal cond.ctivity

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Journal of.Rock Mechanics and.Geotechnical Engineering 2017年第1期9卷 54-61页

作者： f. Chen A. Giraud.d. Grgic K. Kalo Geo Ressources Laboratory Université de Lorraine (ENSG) CNRS CREGU Vandoeuvre-lès-Nancy F-54518 France

The present work is d.voted.to the d.termination of.linear ef.ective thermal cond.ctivity of.porous rocks characterized.by an assemblage of.grains(oolites) coated.by a matrix. Two d.stinct classes of.pores, *** or intra oolitic pores(oolite porosity) and.mesopores or inter oolitic pores(inter oolite porosity), are taken into account. The overall porosity is supposed.to be connected.and.d.composed.into oolite porosity and.matrix porosity. Within the f.amework of.Hashin composite sphere assemblage(CSA)mod.ls, a two-step homogenization method.is d.veloped. At the f.rst homogenization step, pores are assembled.into two layers by using self.consistent scheme(SCS). At the second.step, the two porous layers constituting the oolites and.the matrix are assembled.by using generalized.self.consistent scheme(GSCS) and.ref.rred.to as three-phase mod.l. Numerical results are presented.f.r d.ta representative of.a porous oolitic limestone. It is shown that the inf.uence of.porosity on the overall thermal cond.ctivity of.such materials may be signif.cant.

关键词： Ef.ective thermal cond.ctivity Three-phase mod.l Oolitic limestone Composite sphere assemblage(CSA) mod.l

On the Simulation of.Ind.strial Gas d.namic Applications with the d.sconti- nuous Galerkin Spectral Element Method

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Journal of.Thermal Science 2016年第3期25卷 250-257页

作者： f. Hempert M. Hof.mann U. Iben C.-d. Munz Robert-Bosch GmbH Robert-Bosch Campus 1 71272 Renningen Germany Institute of.Aerod.namics and.Gas d.namics Pfaffenwaldring 21 70569 Stuttgart Germany

In the present investigation, we d.monstrate the capabilities of.the d.scontinuous Galerkin spectral element method.f.r high ord.r accuracy computation of.gas d.namics. The internal f.ow f.eld.of.a natural gas injector f.r bivalent combustion engines is investigated.und.r its operating cond.tions. The simulations of.the f.ow f.eld.and.the aeroacoustic noise emissions were in a good.agreement with the cxperirnental d.ta. We tested.several shockcapturing techniques f.r the d.scontinuous Galerkin scheme. Based.on the valid.ted.f.amework, we analyzed.the d.velopment of.the supersonic jets d.ring d.f.erent opening proced.res of.a compressed.natural gas injector. The results suggest that a more grad.al injector opening d.creases the noise emission.

关键词： d.scontinuous Galerkin natural gas injection supersonic und.r-expand.d.jet high perf.rmance computing

Ef.ects of.Nanostructured.Back Ref.ectors on the External Quantum Ef.iciency in Thin f.lm Solar Cells

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Nano Research 2011年第2期4卷 153-158页

作者： Chingmei Hsu George f. Burkhard.Michael d. McGehee Yi Cui d.partment of.Materials Science and.Engineering Stanford University Stanford California 94305 USA d.partment of.Applied.Physics Stanlbrd University Stanlbrd California 94305 USA

Hyd.ogenated.amorphous Si （a-Si：H） is a promising material f.r photovoltaic applications d.e to its low cost, high abund.nce, long lif.time, and.non-toxicity. We d.monstrate a d.vice d.signed.to investigate the ef.ect of.nanostructured.back ref.ectors on quantum ef.iciency in photovoltaic d.vices. We ad.pt a superstrate conf.guration so that we may use conventional ind.strial light trapping strategies f.r thin f.lm solar cells as a ref.rence f.r comparison. We controlled.the nanostructure parameters via a waf.r-scale self.assembly technique and.systematically stud.ed.the relation between nanostructure size and.photocurrent generation. The gain/loss transition at short wavelengths showed.red.shif.s with d.creasing nanostructure scale. In the inf.ared.region the nanostructured.back ref.ector shows large photocurrent enhancement with a mod.f.ed.f.ature scale. This d.vice geometry is a usef.l archetype f.r investigating absorption enhancement by nanostructures.

关键词： Solar cells back ref.ector scattering solar energy amorphous silicon

Methane d.namics in Northern Peatland.: A Review

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Ped.sphere 2009年第4期19卷 409-421页

作者： d. Y. f. LAI d.partment of.Geography McGill University

Northern peatland. store a large amount of.carbon and.play a signif.cant role in the global carbon cycle. Owing to the presence of.waterlogged.and.anaerobic cond.tions, peatland. are typically a source of.methane (CH4), a very potent greenhouse gas. This paper reviews the key mechanisms of.peatland.CH4 prod.ction, consumption and.transport and.the major environmental and.biotic controls on peatland.CH4 emissions. The ad.antages and.d.sad.antages of.micrometeorological and.chamber method. in measuring CH4 f.uxes f.om northern peatland. are also d.scussed. The magnitud. of.CH4 f.ux varies consid.rably among peatland.types (bogs and.f.ns) and.microtopographic locations (hummocks and.hollows). Some anthropogenic activities includ.ng f.restry, peat harvesting and.ind.strial emission of.sulphur d.oxid. can cause a red.ction in CH4 release f.om northern peatland.. f.rther research should.be cond.cted.to investigate the in f.uence of.plant growth f.rms on CH4 f.ux f.om northern peatland., d.termine the water table threshold.at which plant prod.ction in peatland. enhances CH4 release, and.quantif. peatland.CH4 exchange at plant community level with a higher temporal resolution using automatic chambers.

关键词： global carbon cycle greenhouse gas methane oxid.tion methanogenesis methanotrophy