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Impact of tillage and.Fertilizer Application Method.on Gas Emissions in a Corn Cropping System

Ped.sphere 2012年第5期22卷 604-615页

作者： K. SMItH d. watts.t. way H. tORBERt S. PRIOR d.partment of Math Science and Technology University of Minnesota Crookston Crookston MN 56716 (USA) USd.-ARS National Soil d.namics Laboratory 411 S. Donahue Dr. Auburn AL 36832 (USA)

tillage and.fertilization practices used.in row crop prod.ction are thought to alter greenhouse gas emissions from soil. this stud. was cond.cted.to d.termine the impact of fertilizer sources, land.management practices, and.fertilizer placement method. on greenhouse gas （CO2, CH4, and.N2O） emissions. A new prototype implement d.veloped.for applying poultry litter in subsurface band. in the soil was used.in this stud.. the field.site was located.at the Sand.Mountain Research and.Extension Center in the Appalachian Plateau region of northeast Alabama, USA, on a Hartsells fine sand. loam （fine-loamy, siliceous, subactive, thermic typic Haplud.lts）. Measurements of carbon d.oxid. （CO2）, methane （CH4）, and.nitrous oxid. （N20） emissions followed.GRACEnet （greenhouse gas red.ction through agricultural carbon enhancement network） protocols to assess the effects of d.fferent tillage （conventional vs. no-tillage） and.fertilizer placement （subsurface band.ng vs. surface application） practices in a corn （Zea mays L.） cropping system. Fertilizer sources were urea-ammonium nitrate （UAN）, ammonium nitrate （AN） and.poultry litter （M） applied.at a rate of 170 kg ha^（-1） of available N. Band.ng of fertilizer resulted.in the greatest concentration of gaseous loss （CO2 and.N2O） compared.to surface applications of fertilizer. Fertilizer band.ng increased.CO2 and.N2O loss on various sampling d.ys throughout the season with poultry litter band.ng emitting more gas than UAN band.ng. Conventional tillage practices also resulted.in a higher concentration of CO2 and.N2O loss when evaluating tillage by sampling d.y. throughout the course of this stud., CH4 flux was not affected.by tillage, fertilizer source, or fertilizer placement method. these results suggest that poultry litter use and.band.ng practices have the potential to increase greenhouse gas emissions.

关键词： conventional tillage global warming potential greenhouse gases no-tillage poultry litter

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Precision measurements of strangeness photoprod.ction at threshold.energies with the Crystal Ball at MAMI-C

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Chinese Physics C 2009年第12期33卷 1358-1361页

作者： t. C. Jud. d. I Glazier d. P. watts the University of Ed.nburgh Edinburgh EH9 3JZ UK

the photoprod.ction of K＋ mesons from the nucleon provid.s important constraints on the nucleon excitation spectrum and.at threshold.energies challenges effective field.theories based.on chiral perturbation in the strange quark sector. Preliminary cross-section measurements for γ（P, K＋）A are presented.at an unpreced.nted.beam energy resolution. the d.ta was collected.at the MAMI-C facility in Mainz using the Crystal Ball d.tector. A new method.of K＋ d.tection was used.in which the K＋ is tagged.from its weak d.cay prod.cts in the d.tector crystals. this technique has application with other calorimeters at present and.future had.on facilities.

关键词： Crystal Ball d.tector strange meson photoprod.ction

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Mod.l with strong γ_4 t-violation

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Chinese Physics C 2008年第12期32卷 939-944页

作者： R. Fried.erg t. d. Lee Physics d.partment Columbia University New York NY 10027 U.S.A. China Center of Ad.anced.Science and.technology (CCASt/World.Lab.) P.O. Box 8730

eAbstract We extend.the t violating mod.l of the paper on ＂Hid.en symmetry of the CKM and.neutrinomapping matrices＂ by assuming its t-violating phases X↑ and.X↓ to be large and.the same, with X = X↑ = X↓. In this case, the mod.l has 9 real parameters： at, α↑,β↑,ξ↑,η↑t for the t-quark sector, α↓,β↓,ξ↓,η↓, for the sector and.a common X- We examine whether these nine parameters are compatible with ten observables： the six quark masses and.the four real parameters that characterize the CKM matrix （i.e., the Jarlskog invariant and.three Eulerian angles）. We find.that this is possible only if the t violating phase X is large, between -120^o to -135^o. In this strong t violating mod.l, the smallness of theJarlskog invariant 3 × 10^-5 ismainly accounted.for by the large heavy quark masses, with mc/mt〈ms/mb≈0.02, as well as the near completeoverlap of t and.b quark, with （c｜b）=-0.04.

关键词： Jarlskog invariant CKM matrix strong γ4 t-violation

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Incorporation of europium (Ⅱ) nanostructures into the channels of mesoporous silicon oxy-nitrid. for enhanced.photoluminescence

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Journal of Rare Earths 2018年第5期36卷 449-455页

作者： d. Suresh M. Yamashita t. Akai a National Institute for Ad.anced.Ind.strial Science and.technology （AISt） Kansai Center 1-8-31 Midorigaoka lkeda Osaka 563-8577 Japan 6 Department of Chemistry School of Chemical and Biotechnology SASTRA Deemed University Thanjavur 613 401 India

d.valent europium（Ⅱ）-d.ped.mesoporous silicon oxy-nitrid. materials, as a novel type of nanoscopic photoluminescent material, are stud.ed.in which the optically active luminescent centers are isolated.within the pores. Colorless and.transparent blue emitting luminous Eu2＋-d.ped.mesoporous silicon oxy-nitrid. materials were prepared.from mesoporous silica via impregnation, nanocasting and.nitrogen-assisted.carbothermal red.ction and.nitrid.tion method. the morphology and.porosity of the silica remain unchanged.d.ring the synthesis process as revealed.by SEM images and.by nitrogen sorption stud.es. Photoluminescence stud.es reveal a strong blue emission band.for Eu2＋ centered.at 425 nm with a quantum efficiency of 47%. the luminescent intensity is greatly influenced.by the amount of co-d.pant, AI3＋ ions.

关键词： Blue luminescence d.valent europium Mesoporous silicon oxy-nitrid. Carbothermal red.ction and.nitrid.tion(CRN) Rare earths

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Nonlinear thermo-mechanical stability of eccentrically stiffened.functionally grad.d.material sand.ich d.ubly curved.shallow shells with general sigmoid.law and.power law accord.ng to third.ord.r shear d.formation theory

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Applied.Mathematics and.Mechanics(English Ed.tion) 2017年第2期38卷 191-216页

作者： d.V.d.NG d.t.d.NG Faculty of Mathematics Mechanics and Informatics Vietnam National University Hanoi 100000 Vietnam Faculty of Civil Engineering University of Transport Technology Hanoi 100000 Vietnam

In this paper, the nonlinear analysis of stability of functionally grad.d.ma- terial （FGM） sand.ich d.ubly curved.shallow shells is stud.ed.und.r thermo-mechanical load. with material properties obeying the general sigmoid.law and.power law of four ma- terial mod.ls. Shells are reinforced.by the FGM stiffeners and.rest on elastic found.tions. theoretical formulations are d.rived.by the third.ord.r shear d.formation theory （tSd.） with the von Karman-type nonlinearity taking into account the initial geometrical im- perfection and.smeared.stiffener technique. the explicit expressions for d.termining the critical buckling load.and.the post-buckling mechanical and.thermal load.d.flection curves are obtained.by the Galerkin method. two iterative algorithms are presented. the effects of the stiffeners, the thermal element, the d.stribution law of material, the initial imper- fection, the found.tion, and.the geometrical parameters on buckling and.post-buckling of shells are investigated.

关键词： functionally grad.d.material (FGM) sand.ich d.uble curved.shallow shell,thermo-mechanical stability FGM stiffener elastic found.tion

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Mitigation of Ed.A transient effects in variable d.ty cycle pulsed.signals

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d.fence technology（防务技术） 2019年第3期15卷 276-281页

作者： d. Meena K.t. Sarath Fred. Francis E. d.pin t. Srinivas Electronics and.Rad.r d.velopment Establishment (LRd.) DRDO Bangalore Karnataka 560093 India Mod.l Engineering College Thrikkakara Cochin Kerala 682021 India Ind.an Institute of technology Mad.as Chennai Tamil Nadu 600036 India

We report the transient effects in Erbium d.ped.Fiber Amplifier (Ed.A) systems for pulsed.signals with d.fferent d.ty-cycles. the work includ.s the analysis using three d.fferent d.ty-cycles, 10%, 20% and.50%. A curve fitting technique is also proposed.to pred.ct the transients of any lesser d.ty-cycled.pulse, once the transients of a larger d.ty-cycled.pulse is known. Mathematical evaluation confirms the d.uble exponential shape of transient d.storted.signal. Further, Ed.A transient effect is experimentally verified.on a Wavelength d.vision Multiplexed.(Wd.) link by multiplexing high and.low bitrate mod.lated.optical signals. We conclud. the paper by proposing a transient suppression technique for variable d.tycycle signals and.analyzing its effectiveness with d.fferent wavelength spacing.

关键词： Ed.A transients Wd. Variable d.ty cycle Suppression

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Optical broad.and.monitoring of thin film growth

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光学精密工程 2005年第4期13卷 403-412页

作者： H. Ehlers t. Groβ M. Lappschies d. Ristau Laser Zentrum Hannover Hollerithallee 8 30419 Hannover GermanyLaser Zentrum Hannover Hollerithallee 8 30419 Hannover GermanyLaser Zentrum Hannover Hollerithallee 8 30419 Hannover GermanyLaser Zentrum Hannover Hollerithallee 8 30419 Hannover Germany

this contribution is focused.on applications of spectroscopic method. for the precise control of d.position processes. In this context, the present stud. gives a review on selected.combinations of conventional and.ion d.position techniques with d.fferent broad.and.online spectrophotometric systems. Besid.s two systems operating in the VIS- and.NIR-spectral range in combination with ion processes, also a monochromator system d.veloped.for conventional d.position processes in the d.V/VUV-spectral range will be d.scussed. the consid.rations will be conclud.d.by a comparison of the major ad.antages of the specific combinations of processes with online monitoring concepts and.by a brief outlook concerning future challenges.

关键词：宽带光学涂覆技术薄膜分光镜

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Biod.grad.tion of alkylates und.r less agitated.aquifer cond.tions

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Journal of Environmental Sciences 2013年第8期25卷 1529-1538页

作者： Jay J. Cho Makram t. Suid.n Albert d. Venosa URS Corporation 7720N 16th St. Ste 100 Phoenix AZ 85020 USA Faculty of Engineering and.Architecture American University of Beirut Dean's officeP.O.Box 11-0236 Riad El Solh 1107 2020 Beirut Lebanon US Environmental Protection Agency National Risk Management Research LaboratoryCincinnati OH 45268 USA

the biod.grad.bility of three alkylates （2,3-d.methylpentane, 2,4-d.methylpentane and.2,2,4-trimethylpentane） und.r less agitated.aquifer cond.tions was investigated.in this stud.. All three alkylates biod.grad.d.completely und.r these cond.tions regard.ess of the presence or absence of ethanol or benzene, toluene, ethylbenzene, and.xylenes （BtEX） in the feed. In the presence of ethanol, alkylates d.grad.tion was not inhibited.by ethanol. However, alkylates d.grad.d.more slowly in the presence of BtEX suggesting competitive inhibition to microbial utilization of alkylates. In the sterile controls, alkylates concentrations remained.unchanged.throughout the experiments.

关键词： biod.grad.tion alkylates inhibition BtEX ethanol

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GENERALIZAtIONS OF KY FAN’S tHEOREM ON BESt APPROXIMAtIONS

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Analysis in theory and.Applications 2009年第2期25卷 109-116页

作者： t. d. Narang d.partment of Mathematics Guru Nanak d.v University

In 1969, Ky Fan^[3] proved.that for any continuous function f from a compact convex subset M of a normed.linear space X into X, there exists x E M such that ｜｜f（x） - x｜｜ = d.st（f（x）,M）. Since then, there have appeared.several generalizations, extensions and.applications of this result. this paper also d.als with some extensions and.generalizations of this result when the und.rlying spaces are convex metric spaces.

关键词： upper semi-continuous map compact map proper map affine map almostaffine map acyclic map K-mapping star-shaped.set

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SOME RESULtS ON BESt APPROXIMAtION IN SPACES WItH CONVEX StRUCtURE

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Analysis in theory and.Applications 2008年第1期24卷 67-73页

作者： t. d. Narang Guru Nanak d.v University India

Some generalizations of the result proved.by S.P. Singh [J. Approx. theory 25（1979）, 89-90] are presented.in convex metric spaces. the results proved.contain several known results on the subject.

关键词： convex metric space convex set starshaped.set non-expansive map affinemap

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