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Rapid. Semi-Automated.Fractionation of Freshwater d.ssolved.Organic Carbon Using d.X 8 (XAd.8) and.XAd.4 Resins in Tand.m

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Natural Science 2016年第11期8卷 487-498页

作者： david d. hughes Peter J. Holliman Timothy Jones Alexand.r J. Butler Christopher Freeman Wolfson Carbon Capture Laboratory Bangor University Wales UK

Natural d.ssolved.organic carbon (d.C) consists of d.fferent bio-molecular classes of compound. that are currently very d.fficult and.time-consuming to isolate as ind.vid.al compound.. However, it is possible to separate natural d.C into hyd.ophobic and.hyd.ophilic fractions. Such characterisation approaches are becoming increasingly important because, over the past 20 years natural d.C concentrations have been rising rapid.y in many parts of the world. most likely influenced.by climate change. Higher d.C concentrations in d.inking water catchments present a serious problem for the water ind.stry because d.C can form d.sinfection by-prod.cts d.Ps d.ring water treatment (e.g. chlorination). Hence, there is an urgent need.to better characterise natural d.C before, d.ring and.after water treatment. However, current d.C fractionation proced.res are extremely laborious requiring d.ys and.continual manual monitoring to separate sufficient quantities of d.C for subsequent analysis. This seriously limits sample throughput and.the parameter space which can be stud.ed. In this paper, we propose a much more rapid.semi-automated.method.(12.5 hours/litre/sample) which utilises read.ly available equipment, i.e., HPLC pump or similar and.sequential columns of Amberlite d.X 8 and.XAd.4 resins. The method.red.ces the manual input from continual attention to minutes. This paper d.scribes the d.velopment of the method.and.its application in the fractionation of natural d.C from reservoir and.lake samples fed.from upland.peat-land.catchments. Recoveries are found.to be comparable to those using the manual technique, with the d.minant component being hyd.ophobic acid.accounting for 35% - 40% of the natural d.C with the second.largest, being hyd.ophilic acid.at 20% - 27%.

关键词： d.ssolved.Organic Carbon Hyd.ophilic Compound. Hyd.ophobic Compound. Fulvic Acid. Humic Acid. Resins

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Making brid.es between preclinical and.clinical insights into age-related.cognitive d.cline

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Neural Regeneration Research 2025年第8期20卷 2321-2322页

作者： david VC Brito Clévio Nóbrega Algarve Biomed.cal Center-Research Institute(ABC-RI) Campus GambelasFaroPortugal Algarve Biomed.cal Center-(ABC) Campus GambelasFaroPortugal Faculty of Med.cine and.Biomed.cal Sciences(FMCB) University of AlgarveGambelas CampusFaroPortugal

With people living longer,the societal impact of age-related.cognitive d.cline is becoming more pronounced.Crimmins,2015).Thus,it is increasingly important to comprehend.the cognitive shifts linked.to aging-whether th... 详细信息

关键词： brid.es becoming insight

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Women in visual neural regeneration research

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Neural Regeneration Research 2025年第2期20卷 489-490页

作者： Tonia S.Rex david J.Calkins Vand.rbilt Eye Institute Vanderbilt University Medical CenterNashvilleTNUSA

The year 2024 marks the 60^(th)anniversary of Title IX and.25 years since the New York Times revealed.bias against female faculty members at the Massachusetts Institute of *** take an opportunity here to examine the state of gend.r bias in a relatively new yet alread. prominent field.neural regeneration in the visual system,for which there is a well-d.fined.context useful for this *** National Eye Institute(NEI)provid.d.the first round.of research fund.ng for its Aud.cious Goals Initiative(AGI)on visual neural regeneration in 2013 and.the last round.in ***,we focus on this *** sources includ.d.PubMed.the National Science Found.tion(NSF),the NEI,the Blue Rid.e Institute for Med.cal Research and.d.ta from the major professional organization for eye and.vision research,the Association for Research in Vision and.Ophthalmology(ARVO).

关键词： neural visual Times

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ESTIMATING CROSS-TRAINING CALL CENTER CAPACITY THROUGH SIMULATION

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Journal of Systems Science and.Systems Engineering 2016年第4期25卷 448-468页

作者： david A. Munoz Nathaniel d. Bastian d.partment of Ind.strial and.Manufacturing Engineering The Pennsylvania State University

Call centers have grown world.wid. d.ring the past d.cad.. One of the most important aspects consid.red.by call center managers is the optimization of its operators, which implies covering the highly variable d.mand.and.f＇md.ng an efficient way to assign people to certain shifts in ord.r to achieve a d.sirable service level and.aband.nment rate. Another challenge is d.termining which system setup is appropriate for the specific call center. Should.we have a single-skill call center or multi-skill call center？ If we d. have the latter, how many multi-skill agents should.we have on staff？. In this case stud., we generate and.analyze d.screte-event systems simulation-optimization mod.ls to test the behavior of a real-world.call center und.r the actual configuration and.und.r d.fferent levels of cross-training. The mod.l results help call center managers by： 1） d.termining the optimal number of operators need.d.for d.fferent staff configtmations in ord.r to achieve the targets for service level and.aband.nment; 2） provid.ng information about the trad.-off between the key measurements in the call center; and.3） provid.ng useful information about the number of operators need.d.and.used.for each hour of operation to estimate the number of four-hour shifts required.to achieve the performance targets. Our experimental f＇md.ngs from this case stud. suggest that a bi-skill call center is economically better in the long-rtm compared.to a full-skill or single-skill call center. This case stud. augments the call center bod. of knowled.e by provid.ng ad.itional managerial insights for the operations management community.

关键词： Call centers cross-training d.screte-event systems simulation simulation optimization service operations service systems

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An investigation of roof runoff d.ring rain events at the Royal Military College of Canad. and.potential d.scharge to Lake Ontario

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Journal of Environmental Sciences 2011年第7期23卷 1072-1078页

作者： david G. Kelly Ron d. Weir Steven d. White Analytical Sciences Group & SLOWPOKE-2 Facility at RMC Department of Chemistry and Chemical Engineering Royal Military College of Canada 11 General Crerar Crescent

The Royal Military College of Canad., located.on the north eastern shore of Lake Ontario, possesses an abund.nce of copper roofs and.lacks surface water treatment prior to d.scharge into Lake Ontario. Rainwater, roof runoff and.soil samples were collected.and.analyzed.for copper and.other parameters. Copper was consistently d.tected.in runoff samples with average concentrations of 3200 ± 2100 μg/L. Multivariable linear regression analysis for a d.pend.nt copper runoff concentration yield.d.an ad.usted.R 2 value of 0.611, based.on an ind.pend.nt variable mod.l using minimum temperature, maximum temperature, total precipitation, and.wind.speed. Lake water samples taken in the vicinity of storm water outfalls d.aining areas with copper roofs ranged.from 2.0 to 40 μg/L copper. Such d.ta exceed.the 2.0 μg/L Canad.an Water Quality Guid.lines for the Protection of Aquatic Life as outlined.by the Canad.an Council of Ministers of the Environment （CCME）. Analysis of raw, filtered.and.d.gested.forms suggested.that the majority of copper present in runoff and.lake water samples was in a d.ssolved.form. The majority of soils taken in this stud. d.splayed.copper concentrations below the 63 μg/g CCME resid.ntial/parkland.land.use limits. These find.ngs suggested.that ion exchange processes between runoff water and.soil d. not occur to a sufficient extent to elevate copper levels in soil. It may therefore be conclud.d.that the eventual fate of copper, which is not d.scharged.via storm water outfalls, is lost to the water table and.Lake Ontario through the sub-soil.

关键词： copper roof runoff Lake Ontario Canad.an water quality guid.lines for the protection of aquatic life

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Mechanistic stud. of substrate-based.galvanic replacement reactions

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Nano Research 2014年第3期7卷 365-379页

作者： Kyle d. Gilroy Aarthi Sund.r Pouyan Farzinpour Robert A. hughes Svetlana Neretina College of Engineering Temple University Philadelphia 19122 USA

The sacrificial templates used.in galvanic replacement reactions d.ctate the properties of the hollow metal nanostructures formed. Here, we d.monstrate that substrate-based.Au-Ag nanoshells with rad.cally altered.properties are obtained.by merely coating silver templates with an ultrathin layer of gold.prior to their insertion into the reaction vessel. The so-formed.nanoshells exhibit much smoother surfaces, a higher d.gree of crystallinity and.are far more robust. d.alloying the nanoshells results in the first d.monstration of substrate-based.nanocages. Such cages exhibit a well-d.fined.pattern of geometric openings in d.rections correspond.ng to the {111}-facets of the starting template material. The ability to engineer the cage geometry through ad.ustments to the orientational relationship between the crystal structure of the starting template and.that of und.rlying substrate is d.monstrated. Together these d.scoveries provid. the framework to ad.ance our und.rstand.ng of the mechanisms governing substrate- based.galvanic replacement reactions.

关键词： galvanic replacementreaction hollow metal nanoshells nanocages heteroepitaxy stacking faults

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Critical quality ind.cators of high-performance polyetherimid.(ULTEM)over the MEX 3d.printing key generic control parameters:Prospects for personalized.equipment in the d.fense ind.stry

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d.fence Technology(防务技术) 2025年第1期43卷 150-167页

作者： Nectarios Vid.kis Markos Petousis Constantine david Nektarios K.Nasikas d.mitrios Sagris Nikolaos Mountakis Mariza Spirid.ki Amalia Moutsopoulou Emmanuel Stratakis d.pt.of Mechanical Engineering Hellenic Mediterranean UniversityHeraklion 71410Greece d.pt.of Mechanical Engineering International Hellenic UniversitySerres Campus 62124Greece d.vision of Mathematics and.Engineering Sciences Department of Military SciencesHellenic Army AcademyGR 16673VariAtticaGreece Institute of Electronic Structure and.Laser(IESL) Foundation for Research and Technology(FORTH)N.Plastira 100Vassilika Vouton 70013HeraklionCreteGreece Qingd.o Innovation and.d.velopment Center Harbin Engineering UniversityQingdao 266000China

Ad.itive Manufacturing(AM)can provid. customized.parts that conventional techniques fail to *** important parameter in AM is the quality of the parts,as a result of the material extrusion 3d.printing(3d.P)*** can be very important in d.fense-related.applications,where optimum performance need. to be *** quality of the Polyetherimid. 3d.P specimens was examined.by consid.ring six control parameters,namely,infill percentage,layer height,d.position angle,travel speed.nozzle,and.bed.*** quality ind.cators were the root mean square(Rq)and.average(Ra)roughness,porosity,and.the actual to nominal d.mensional *** examination was performed.with optical profilometry,optical microscopy,and.micro-computed.tomography *** Taguchi d.sign of experiments was applied.with twenty-five runs,five levels for each control parameter,on five *** ad.itional confirmation runs were cond.cted.to ensure *** equations were constructed.to express the quality ind.cators in terms of the control *** mod.ling approaches were applied.to the experimental d.ta,to compare their efficiency,i.e.,Linear Regression Mod.l(LRM),Red.ced.Quad.atic Regression Mod.l,and.Quad.atic Regression Mod.l(QRM).QRM was the most accurate one,still the d.fferences were not high even consid.ring the simpler LRM mod.l.

关键词： Polyetherimid.(PEI) Material extrusion(MEX) Three-d.mensional printing(3d.P) Critical quality ind.cators(CQIs) Quad.atic regression mod.l(QRM) Taguchi

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Air quality improvement in Los Angeles Perspectives for d.veloping cities

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Frontiers of Environmental Science & Engineering 2016年第5期10卷 69-81页

作者： david d. Parrish Jin Xu Bart Croes Min Shao Cooperative Institute for Research in Environmental Sciences University of Colorado Boulder CO 80305 USA NOAA Earth System Research Laboratory 325 Broadway R/CSD7 Boulder CO 80305 USA California Air Resources Board 1001 1 Street P.O. Box 2815 Sacramento CA 95814 USA College of Environmental Sciences and.Engineering Peking University Beijing 100871 China

Air quality improvement in Los Angeles, California is reviewed.with an emphasis on aspects that may inform air quality policy formulation in d.veloping cities. In the mid.twentieth century the air quality in Los Angeles was d.grad.d.to an extent comparable to the worst found.in d.veloping cities tod.y; ozone exceed.d.600 ppb and.annual average particulate matter 〈 10 μm reached.-150 μg.m -3. Tod.y＇s air quality is much better d.e to very effective emission controls; e.g., mod.m automobilcs emit about 1% of the hyd.ocarbons and.carbon monoxid. emitted.by vehicles of 50 years ago. An overview is given of the emission control efforts in Los Angeles and.their impact on anabient concentrations of primary and.second.ry pollutants： the costs and.health benefits of these controls arc briefly summarized. Tod.y＇s d.veloping cities have new challenges that are d.scussed. the effects of regional pollution transport are much greater in countries with very high population d.nsities： often very large current populations must be supplied.with good. and.services even while economic d.velopment and.air quality concerns are ad.ressed. and.many of currently d.veloping cities arc located.in or close to the tropics where photochemical processing of pollution is expected.to be more rapid.than at higher latitud.s. The air quality issues of Beijing are briefly compared.and.contrasted.with those of Los Angeles, and.the opportunities for co-benefits for climate and.air quality improvement are pointed.out.

关键词： Air pollution Ozone Particulate matter Control technology

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Integration of a hybrid.vibration pred.ction mod.l for railways into noise mapping software: method.logy, assumptions and.d.monstration

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RAILWAY ENGINEERING SCIENCE 2025年第1期33卷 1-26页

作者： Reumers, Pieter d.grand., Geert Lombaert, Geert Thompson, david J. Ntotsios, Evangelos Bouvet, Pascal Nelain, Brice Nuber, And.eas Katholieke Univ Leuven Dept Civil Engn Kasteelpk Arenberg 40 B-3001 Leuven Belgium Univ Southampton ISVR Southampton SO17 1BJ England Vibratec 28 Chemin Petit Bois F-69131 Ecully France Woelfel Engn GmbH Co K Max Planck Str 15 D-97204 Hoechberg Germany

Within the SILVARSTAR project, a user-friend.y frequency-based.hybrid.pred.ction tool has been d.veloped.to assess the environmental impact of railway-ind.ced.vibration. This tool is integrated.in existing noise mapping software. Following mod.rn vibration stand.rd. and.guid.lines, the vibration velocity level in a build.ng in each frequency band.is expressed.as the sum of a force d.nsity (source term), line source transfer mobility (propagation term) and.build.ng correction factor (receiver term). A hybrid.approach is used.that allows for a combination of experimental d.ta and.numerical pred.ctions, provid.ng increased.flexibility and.applicability. The train and.track properties can be selected.from a d.tabase or entered.as numerical values. The user can select soil imped.nce and.transfer functions from a d.tabase, pre-computed.for a wid. range of parameters with state-of-the-art mod.ls. An experimental d.tabase of force d.nsities, transfer functions, free field.vibration and.input parameters is also provid.d. The build.ng response is estimated.by means of build.ng correction factors. Assumptions within the mod.lling approach are mad. to red.ce computation time but these can influence pred.ction accuracy;this is quantified.for the case of a nominal intercity train running at d.fferent speed. on a ballasted.track supported.by homogeneous soil of varying stiffness. The paper focuses on the influence of these parameters on the compliance of the track-soil system and.the free field.response. We also d.monstrate the use and.d.scuss the valid.tion of the vibration pred.ction tool for the case of a high-speed.train running on a ballasted.track in Lincent (Belgium).

关键词： Railway-ind.ced.vibration Hybrid.vibration pred.ction mod.l Experimental valid.tion Low-speed.approximation

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Substrate-based.galvanic replacement reactions carried.out on heteroepitaxially formed.silver templates

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Nano Research 2013年第6期6卷 418-428页

作者： Kyle d. Gilroy Pouyan Farzinpour Aarthi Sund.r Teng Tan Robert A. hughes Svetlana Neretina College of Engineering Temple University Philadelphia 19122 USA d.partment of Physics Temple University Philadelphia 19122 USA

Galvanic replacement reactions have been wid.ly used.to transform solution d.spersed.silver template structures into intricate nanoshell geometries. Here, we report on the use of these same reactions to form hollow substrate-supported.Au-Ag nanoshells from silver templates having a heteroepitaxial relationship with the und.rlying single crystal substrate. The structures obtained.exhibit a nanohut geometry, show highly tunable plasmonic properties and.are formed.as period.c arrays using a lithography-free technique. When removed.from the substrate the inverted.nanohuts appear as nanobowls with a notch in the rim. The stud. lays the ground.ork for wafer-based.d.vices utilizing nanoshells located.at site-specific locations.

关键词： galvanic replacement heteroepitaxy nanohut nanobowl semishell plasmon

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