检索结果-南通市图书馆

Exp.rim.ntal investigation of radiative heat p.op.gation in a sim.lified generic p.cked bed

在线全文

学校读者我要写书评

暂无评论

p.rticuology 2024年第5期88卷 149-160页

作者： m.tthias Tyslik Lukas p.rtner Siegm.r Wirtz martin Schiem.nn Institute of Energy p.ant Technology Ruhr-University Bochum44780 BochumGermany

A novel test rig for the investigation of radiative heat transfer in p.cked beds has been develop.d and is introduced with rep.esentative exp.rim.ntal *** individual com.onents and the calibration are *** generic p.cked bed is realized in a sim.lified way by an arrangem.nt of p.rallel rods,which rep.esent p.rticles in *** this arrangem.nt,electrically heated rods p.ovide the radiation p.op.gating through the rod array to heat the p.ssive counterp.rts.A sop.isticated tem.erature-control schem. with a large num.er of therm.coup.es and infrared-im.ging p.ovides in-dep.h inform.tion about heat transfer in the *** radiation intensities are determ.ned with a Fourier-transform.infrared sp.ctroscop.,which has been m.dified and validated for this sp.cific *** order to com.are the influence of different surface p.op.rties of p.rticles on the heat p.op.gation and surface reflections,rod sam.les m.de of stainless steel and m.gnesium.oxide are *** influence of m.terial p.op.rties becom.s clearly visible by com.aring the high radiation intensities resulting from.a stainless steel rod array to the sam. geom.try built from.m.gnesium.oxide *** addition,the influence of the surface p.op.rties is p.rticularly evident in the infrared im.ges since the reflections are significantly higher for the stainless steel sam.les than for the m.gnesium.oxide *** exp.rim.ntal results in the current work dem.nstrate the ability of the test rig to p.ovide data with a well-defined accuracy as a validation base for num.rical radiation sim.lations in p.cked beds.

关键词： Therm.l radiation Sp.ctral reflections Fourier-transform.infrared sp.ctroscop.

Drought events influence nutrient canop. exchanges and green leaf p.rtitioning during senescence in a deciduous forest

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Forest Ecosystem. 2024年第1期11卷 110-119页

作者： J.Touche C.Calvaruso p.De Donato m.-p.Turp.ult INRAE BEFF-54000NancyFrance Um. 7359 GeoRessourcesFaculte des Sciences-Campus des Aiguillettes54506Vandoeuvre Les NancyFrance EcoSustain Environmental Engineering OfficeResearch and DevelopmentKanfen57330France

The increase in the frequency and intensity of drought events exp.cted in the com.ng decades in Western Europ. m.y disturb forest biogeochem.cal cycles and create nutrient deficiencies in *** p.ssible origin of nutrient deficiency is the disturbance of the p.rtitioning of the green leaf p.ol during the leaf senescence p.riod between resorp.ion,foliar leaching and senesced ***,the effects of drought events on this p.rtitioning and the consequences for the m.intenance of tree nutrition are p.orly *** exp.rim.nt in a beech forest in m.use(France)was conducted to assess the effect of drought events on nutrient canop. exchanges and on the p.rtitioning of the green leaf p.ol during the leaf senescence *** aim.was to identify p.tential nutritional consequences of droughts for *** nutrient dynam.cs,including resorp.ion,chem.stry of green and senesced leaves,foliar absorp.ion and leaching in m.ture beech stands from.2012 to 2019 allowed us to com.are the nutrient exchanges for three nondry and three dry years(i.e.,with an intense drought event during the growing season).During dry years,we observed a decrease by alm.st a third of the p.tassium.K)p.rtitioning to resorp.ion(*** efficiency),thus reducing the K reserve in trees for the next growing *** result suggests that with the increased drought frequency and intensity exp.cted for the com.ng decades,there will be a risk of p.tassium.deficiency in trees,as already observed in a rainfall exclusion exp.rim.nt on the sam. study *** foliar leaching and higher p.rititioning to the senesced leaves for K and p.osp.orus(p.were also *** addition,a slight increase in nitrogen(N)resorp.ion efficiency occurred during dry years which is m.re likely to im.rove tree *** calcium.Ca)negative resorp.ion decreased,with no ap.arent consequence in our study *** results show that nutrient exchanges in the canop. and the p.rtitioning of the green leaf

关键词： Natural drought Beech forest Canop. Resorp.ion Foliar leaching Senesced leaves Nutrition

Wear dep.ndent virtual flow rate sensor for p.ogressing cavity p.m.s with deform.ble stator

在线全文

学校读者我要写书评

暂无评论

p.troleum.Science 2024年第2期21卷 1346-1353页

作者： Jens m.ller Sebastian Leonow Johannes Schulz Christian Hansen martin m.nnigm.nn Ruhr-Universitat Bochum Universit atsstraûe 150Bochum44801Germany SEEp.X Gm.H Scharnh olzstraûe 344Bottrop46240Germany

This contribution p.esents a novel wear dep.ndent virtual flow rate sensor for single stage single lobe p.ogressing cavity p.m.s. We study the wear-induced m.terial loss of the p.m. com.onents and the im.act of this m.terial loss on the volum.tric efficiency. The results are com.ined with an established backflow m.del to im.lem.nt a backflow calculation p.ocedure that is adap.ive to wear. We use a laboratory test setup.with a highly abrasive fluid and op.rate a p.m. from.new to worn condition to validate our ap.roach. The obtained m.asurem.nt data show that the p.esented virtual sensor is cap.ble of calculating the flow rate of a p.m. being subject to wear during its regular op.ration.

关键词： Backflow p.ogressing cavity p.m. Virtual sensor Wear

A reduced m.del for p.rticle calcination for use in DEm.CFD sim.lations

在线全文

学校读者我要写书评

暂无评论

p.rticuology 2024年第10期93卷 316-327页

作者： Lucas m.eg Torben Bergold Enric Illana m.hiques Viktor Scherer martin m.nnigm.nn Autom.tic Control and System.Theory Ruhr University BochumGermany Energy p.ant Technology Ruhr University BochumGermany

We treat the accurate sim.lation of the calcination reaction in p.rticles,where the p.rticles are large and,thus,the inner-p.rticle p.ocesses m.st be *** these p.ocesses need to be described with coup.ed p.rtial differential equations(p.Es)that m.st be solved num.rically,the com.utation tim.s for a single p.rticle are too high for use in sim.lations that involve m.ny *** of this typ. arise when the Discrete Elem.nt m.thod(DEm.is com.ined with Com.utational Fluid Dynam.cs(CFD)to investigate industrial system. such as quicklim. p.oduction in lim. shaft *** show that,based on p.op.r orthogonal decom.osition and Galerkin p.ojection,reduced m.dels can be derived for single p.rticles that p.ovide the sam. sp.tial and tem.oral resolution as the original p.E m.dels at a considerably reduced com.utational *** the finite volum. p.rticle m.dels with the reduced m.dels results in an overall reduction of the reactor sim.lation tim. by about 40%for the sam.le system.treated here.

关键词： Calcination Reactive bulk m.del reduction Discrete elem.nt m.thod Galerkin p.ojection

Dual-Fields Rotational Total Skin Electron Therap.: Investigation and Im.lem.ntation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of m.dical p.ysics, Clinical Engineering and Radiation Oncology 2024年第1期13卷 1-15页

作者： m. m.ng Xu Iris Rusu Richard p. Garza Northwestern m.dicine Cancer Center Warrenville and Geneva Illinois USA Dep.rtm.nt of Radiation Oncology Loyola University Medical Center Maywood Illinois USA The Austin Center for Radiation Oncology Austin Texas USA

p.rp.se: To p.esent a p.otocol of a dual-field rotational (DFR) total skin electron therap. (TSET) and to p.ovide an assessm.nt of clinical im.lem.ntation, dosim.try p.op.rties, and skin dose evaluation. m.thods and m.terials: The DFR-TSET com.ined the Stanford 6-field and m.Gill rotational m.thods. Dual 6 m.V electron beam. in high dose total skin electron m.de were used for DFR-TSET on a com.ercial linac. Beam.p.ofiles and dosim.tric p.op.rties were m.asured using solid p.antom.. The dose rate at exp.nded source-to-surface distance (SSD) was a com.ination of static rate and rotational rate. In vivo dosim.try of p.tient skin was p.rform.d on p.tients’ skin using film. m.tal oxide sem.conductor field-effect transistors (m.SFET), and op.ically stim.lated lum.nescent dosim.ters (OSLD). Results: Dual field rotational total skin electron therap. exhibited good (≤±10%) uniform.ty in the beam.p.ofiles in the vertical direction at an extended SSD of 332 cm.with a gantry angulation of ±20˚ deviated from.the horizontal direction. In-vivo m.asurem.nts confirm.d accep.able uniform.ty of the p.tients’ total body surfaces and revealed anatom.cally self-blocked or shielded areas where underdosing occurred. Conclusions: The clinical im.lem.ntation of DFR-TSET effectively utilizes the sp.cial m.de on a linac. This technique p.ovides short beam.on tim.s, uniform.dose distribution, large treatm.nt field, and reduced dose of x-ray contam.nation to the p.tients. In-vivo m.asurem.nts indicate satisfactory delivery and dose uniform.ty of the p.escribed dose. Electron boost fields are recom.ended at norm.l SSDs to address underdosed areas.

关键词： Total Skin Electron Therap. Stanford 6 Field m.Gill Rotation Therap. In-Vivo Dosim.try

Im.une consequences of exercise in hyp.xia:A narrative review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Sp.rt and Health Science 2024年第3期13卷 297-310,I0002页

作者： Johannes Burtscher Qadar p.sha Neha Chanana Gregoire p.m.llet martin Burtscher Barbara Strasser Institute of Sp.rt Sciences University of LausanneLausanne 1015Switzerland Institute of Hyp.xia Research New Delhi 110067India Dep.rtm.nt of Biochem.stry Jamia HamdardNew Delhi 110062India Dep.rtm.nt of Sp.rt Science University of InnsbruckInnsbruck 6020Austria Faculty of m.dicine Sigmund Freud Private UniversityVienna 1020Austria Ludwig Boltzm.nn Institute for Rehabilitation Research Vienna 1100Austria

Im.une outcom.s are key m.diators of m.ny health benefits of exercise and are determ.ned by exercise typ.,dose(frequency/duration,intensity),and individual ***,reduced availability of am.ient oxygen(hyp.xia)m.dulates im.une functions dep.nding on the hyp.xic dose and the individual cap.city to resp.nd to *** com.ined exercise and hyp.xia(e.g.,high-altitude training)sculp.s im.une resp.nses is not well understood,although such com.inations are becom.ng increasingly ***,in this p.p.r,we sum.arize the im.act on im.une resp.nses of exercise and of hyp.xia,both indep.ndently and together,with a focus on sp.cialized cells in the innate and adap.ive im.une *** review the regulation of the im.une system.by tissue oxygen levels and the overlap.ing and distinct im.une resp.nses related to exercise and hyp.xia,then we discuss how they m.y be m.dulated by nutritional ***,antioxidant,and anti-inflam.atory m.chanism. underlie m.ny of the adap.ations that can lead to im.roved cellular m.tabolism.resilience,and overall im.une functions by regulating the survival,differentiation,activation,and m.gration of im.une *** review shows that exercise and hyp.xia can im.air or com.lem.nt/synergize with each other while regulating im.une system.*** acclim.tization,training,and nutritional strategies can be used to avoid risks and tap.into the synergistic p.tentials of the p.orly studied im.une consequences of exercising in a hyp.xic state.

关键词： Altitude Exercise Hyp.xia Im.une resp.nse Training

Kentish p.over(Charadrius alexandrinus) and Little Tern(Sternula albifrons) p.efer shells for nesting:A field exp.rim.nt

在线全文

学校读者我要写书评

暂无评论

Avian Research 2024年第1期15卷 55-59页

作者： m.carena Castro Andrés De la Cruz Nuria martin-Sanjuan Alejandro p.rez-Hurtado Instituto Universitario de Investigacion m.rina(INm.R) Campus de Excelencia Internacional del Mar(CEIMAR)Departamento de BiologíaUniversidad de CadizPuerto RealSpain Servicios centrales de Investigacion Salinas de la Esp.ranza Universidad de CadizPuerto RealSpain

Shorebird p.p.lations are declining worldwide,m.inly due to hum.n disturbances and loss of coastal ***,sup.atidal habitats as saltp.ns could p.ay a role in buffering hum.n *** have shown to be im.ortant as feeding or breeding sites of som. shorebird sp.cies.A p.tential conservation strategy to increase shorebird p.p.lations in saltp.ns is to m.nip.late the cues that birds use to select op.im.l breeding *** it is hyp.thesized that shorebirds are attracted to bivalve shells due to the advantages they *** this hyp.thesis,we sup.lem.nted a restored saltp.n in 2019 and 2021 with bivalve shells,exp.cting an increase in the num.er of breeding birds’ *** than 75% of Kentish p.over(Charadrius alexandrinus) and Little Tern(Sternula albifrons) nests were found in p.tches with shells in both *** best m.del for both sp.cies indicates that the p.esence of shells is the factor that m.st correlates with the location of *** p.obability of choosing one p.ace over another to settle their nest increases in areas with an abundance of shells,double in the case of the Kentish p.over and trip.e in the case of the Little *** result of this study m.y constitute a valuable tool for attracting birds to restored saltp.ns and could contribute to the success of exp.nsive restoration p.ojects where tim. is usually a constraint.

关键词： Habitat m.nagem.nt Nest site selection Saltp.n restoration Shell sup.lem.ntation Shorebirds

Selection of digital fabrication technique in the construction industry--A m.lti-criteria decision-m.king ap.roach

在线全文

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2024年第7期18卷 977-997页

作者： m.p.SALAIm.NIm.GUDAm.J.JAYAp.AKASH Dep.rtm.nt of Structural and Geotechnical Engineering School of Civil EngineeringVellore Institute of TechnologyVellore 632014India

Digital fabrication techniques,in recent decades,have p.ovided the basis of a sustainable revolution in the construction ***,selecting the digital fabrication m.thod in term. of m.nufacturability and functionality requirem.nts is a com.lex *** p.p.r p.esents alternatives and criteria for selection of digital fabrication techniques by adop.ing the m.lti-criteria decision-m.king *** alternatives considered in the study are concrete three-dim.nsional(3D)p.inting,shotcrete,sm.rt dynam.c casting,m.terial intrusion,m.sh m.lding,injection concrete 3D p.inting,and thin form.ng *** criteria include form.ork utilization,reinforcem.nt incorp.ration,geom.trical com.lexity,m.terial enhancem.nt,assem.ly com.lexity,surface finish,and build *** dem.nstrates different m.lti-criteria decision-m.king techniques,with both subjective and objective weighting *** given ranking is based on the current condition of digital fabrication in the construction *** study reveals that in the selection of digital fabrication techniques,the criteria including reinforcem.nt incorp.ration,build area,and geom.trical com.lexity p.ay a p.votal role,collectively accounting for nearly 70% of the overall *** the evaluated techniques,concrete 3D p.inting em.rged as the best p.rform.r,however the shotcrete and m.sh m.lding techniques in the second and third p.sitions.

关键词： digital fabrication m.lticriteria decision-m.king concrete 3D p.inting

CO_(2)cap.ure costs of chem.cal loop.ng com.ustion of biom.ss:A com.arison of natural and synthetic oxygen carrier

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chem.stry 2024年第5期92卷 296-310页

作者： Benjam.n Fleiß Juraj p.iscak martin Ham.erschm.d Josef Fuchs Stefan m.ller Herm.nn Hofbauer Institute of Chem.cal Environmental and Bioscience EngineeringTU WienVienna1060 ViennaAustria BEST–Bioenergy and Sustainable Technologies Gm.H Graz8010 StyriaAustria

Chem.cal loop.ng com.ustion has the p.tential to be an efficient and low-cost technology cap.ble of contributing to the reduction of the atm.sp.eric concentration of CO_(2) in order to reach the 1.5/2°C goal and m.tigate clim.te *** this p.ocess,a m.tal oxide is used as oxygen carrier in a dual fluidized bed to generate clean CO_(2) via com.ustion of *** com.only,natural ores or synthetic m.terials are used as oxygen carrier whereas both m.st m.et sp.cial requirem.nts for the conversion of solid *** oxygen carriers are characterized by higher reactivity at the exp.nse of higher costs versus the lower-cost natural *** determ.ne the viability of both p.ssibilities,a techno-econom.c com.arison of a synthetic m.terial based on m.nganese,iron,and cop.er to the natural ore ilm.nite was *** synthetic oxygen carrier was characterized and tested in a p.lot p.ant,where high com.ustion efficiencies up.to 98.4%and carbon cap.ure rates up.to 98.5%were *** techno-econom.c assessm.nt resulted in CO_(2) cap.ure costs of 75 and 40€/tCO_(2) for the synthetic and natural ore route resp.ctively,whereas a sensitivity analysis showed the high im.act of p.oduction costs and attrition rates of the synthetic *** synthetic oxygen carrier could break even with the natural ore in case of lower p.oduction costs and attrition rates,which could be reached by adap.ing the p.oduction p.ocess and recycling *** com.arison to state-of-the-art technologies,it is dem.nstrated that both routes are viable and the cap.ure cost of CO_(2) could be reduced by im.lem.nting the chem.cal loop.ng com.ustion technology.

关键词： Chem.cal loop.ng com.ustion BECCS Techno-econom.c assessm.nt CO_(2)cap.ure costs Oxygen carrier develop.0}nt Synthetic m.terials Ilm.nite