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Wear dependent virtual flow rate sensor for progressing cavity pum.s with deform.ble stator

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Petroleum.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 SEEPEX Gm.H Scharnh olzstraûe 344Bottrop46240Germany

This contribution presents a novel wear dependent virtual flow rate sensor for single stage single lobe progressing cavity pum.s. We study the wear-induced m.terial loss of the pum. 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 procedure that is adaptive to wear. We use a laboratory test setup with a highly abrasive fluid and operate a pum. from.new to worn condition to validate our approach. The obtained m.asurem.nt data show that the presented virtual sensor is capable of calculating the flow rate of a pum. being subject to wear during its regular operation.

关键词： Backflow Progressing cavity pum. Virtual sensor Wear

A short clim.tology of black and brown carbon and their sources at a suburban site im.acted by sm.ke in Brazil

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Journal of Environm.ntal Sciences 2024年第2期136卷 498-511页

作者： Adm.r Creso Targino Patricia Krecl Gabriel Yoshikazu Oukawa eva m.ria m.llinedo Graduate Program.in Environm.ntal Engineering Federal University of TechnologyAv.Pioneiros 3131LondrinaPR 86036-370Brazil Departm.nt of Environm.ntal Engineering Federal University of TechnologyAv.Pioneiros 3131LondrinaPR 86036-370Brazil

Em.ssions from.biom.ss burning challenge efforts to curb air pollution in cities downwind of fire-prone regions,as they contribute large am.unts of brown carbon(Br C)and black carbon(BC)*** investigated the patterns of Br C and BC concentrations using Aethalom.ter data(atλ=370 and 880 nm.respectively)spanning four years at a site im.acted by the outflow of *** data required to be post processed for the shadowing effect since,without correction,concentrations would be between 29%and 35%*** Br C concentrations were consistently higher than the BC concentrations,indicating the prevalence of aerosols from.biom.ss *** results were supported by the Angstrom.coefficient(A_(370/880)),with values predom.nantly larger than 1(m.an±standard deviation:1.25±0.31).A_(370/880)values below 1 were m.re prevalent during the wet season,which suggests a contribution from.fossil fuel *** observed sharp Br C and BC seasonal signals,with m.an m.nim.m.concentrations of 0.40μg/m.(3)and 0.36μg/m.(3),respectively,in the wet season,and m.an m.xim.m.concentrations of 2.05μg/m.(3)and 1.53μg/m.(3)in the dry *** largest concentrations were observed when northerly air m.sses m.ved over regions with a high density of fire *** burning of residential solid waste and industrial com.ustion caused extrem. Br C and BC concentrations under favourable wind *** neither pollutant is included in any am.ient air quality standards,our results suggest that transboundary sm.ke m.y ham.er efforts to m.et the World Health Organization guidelines for fine particles.

关键词： Light-absorbing carbonaceous m.tter Black carbon Wildfires Biom.ss burning Aethalom.ter

CO_(2)capture costs of chem.cal looping com.ustion of biom.ss:A com.arison of natural and synthetic oxygen carrier

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

作者： Benjam.n Fleiß Juraj Priscak 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 looping com.ustion has the potential to be an efficient and low-cost technology capable of contributing to the reduction of the atm.spheric concentration of CO_(2) in order to reach the 1.5/2°C goal and m.tigate clim.te *** this process,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 special requirem.nts for the conversion of solid *** oxygen carriers are characterized by higher reactivity at the expense of higher costs versus the lower-cost natural *** determ.ne the viability of both possibilities,a techno-econom.c com.arison of a synthetic m.terial based on m.nganese,iron,and copper to the natural ore ilm.nite was *** synthetic oxygen carrier was characterized and tested in a pilot plant,where high com.ustion efficiencies up to 98.4%and carbon capture rates up to 98.5%were *** techno-econom.c assessm.nt resulted in CO_(2) capture costs of 75 and 40€/tCO_(2) for the synthetic and natural ore route respectively,whereas a sensitivity analysis showed the high im.act of production costs and attrition rates of the synthetic *** synthetic oxygen carrier could break even with the natural ore in case of lower production costs and attrition rates,which could be reached by adapting the production process and recycling *** com.arison to state-of-the-art technologies,it is dem.nstrated that both routes are viable and the capture cost of CO_(2) could be reduced by im.lem.nting the chem.cal looping com.ustion technology.

关键词： Chem.cal looping com.ustion BECCS Techno-econom.c assessm.nt CO_(2)capture costs Oxygen carrier developm.nt Synthetic m.terials Ilm.nite

Design of high-tem.erature superconductors at m.derate pressures by alloying AlH3 or GaH3

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m.tter and Radiation at Extrem.s 2024年第1期9卷 94-103页

作者： Xiaowei Liang Xudong Wei eva Zurek Aitor Bergara Peifang Li Guoying Gao Yongjun Tian Center for High Pressure Science(CHiPS) State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China School of m.terials Science and Engineering Henan University of TechnologyZhengzhou 450001China Departm.nt of Chem.stry State University of New York at BuffaloBuffaloNew York 14260-3000USA Physics Departm.nt and EHU Quantum.Center University of the Basque CountryUPV/EHU48080 BilbaoSpain Donostia International Physics Center(DIPC) 20018 DonostiaSpain Centro de Física de m.teriales CFm Centro Mixto CSIC-UPV/EHU20018 DonostiaSpain Extrem. Conditions Physics Research Team College of Physics and Electronic InformationInner Mongolia Minzu UniversityTongliao 028043China

Since the discovery of hydride superconductors,a significant challenge has been to reduce the pressure required for their *** this context,we propose that alloying could be an effective strategy to achieve *** focus on a series of alloyed hydrides with the Am._(6)com.osition,which can be m.de via alloying A15 AH_(3)(A=Al or Ga)with m.m.a group IIIB or IVB m.tal),and study their behavior under *** of them.are predicted to m.intain the A15-type structure,sim.lar to AH_(3)under pressure,providing a platform.for studying the effects of alloying on the stability and superconductivity of AH_(3).Am.ng these,the A15-type phases of AlZrH_(6)and AlHfH_(6)are found to be therm.dynam.cally stable in the pressure ranges of 40–150 and 30–181 GPa,***,they rem.in dynam.cally stable at even lower pressures,as low as 13 GPa for AlZrH_(6)and 6 GPa for AlHfH_(6).These pressures are significantly lower than that required for stabilizing A15 ***,the introduction of Zr or Hf increases the electronic density of states at the Ferm. level com.ared with *** enhancem.nt leads to higher critical tem.eratures(Tc)of 75 and 76 K for AlZrH_(6)and AlHfH_(6)at 20 and 10 GPa,*** the case of Gam._(6)alloys,where m.represents Sc,Ti,Zr,or Hf,these m.tals reinforce the stability of the A15-type structure and reduce the lowest therm.dynam.cally stable pressure for GaH_(3) from.160 GPa to 116,95,80,and 85 GPa,*** noteworthy are the A15-type Gam._(6)alloys,which rem.in dynam.cally stable at low pressures of 97,28,5,and 6 GPa,sim.ltaneously exhibiting high Tc of 88,39,70,and 49 K at 100,35,10,and 10 GPa,***,these findings enrich the fam.ly of A15-type superconductors and provide insights for the future exploration of high-tem.erature hydride superconductors that can be stabilized at lower pressures.

关键词： alloying alloys superconductors

Genom.c m.saicism.of the Brain:Origin,Im.act,and Utility

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Neuroscience Bulletin 2024年第6期40卷 759-776页

作者： Jared H.Graham.Johannes C.m.Schlachetzki Xiaoxu Yang martin W.Breuss Departm.nt of Pediatrics Section of Clinical Genetics and MetabolismUniversity of Colorado School of MedicineAurora80045-2581COUSA Departm.nt of Cellular and m.lecular m.dicine University of California San DiegoLa Jolla92093-0021San DiegoCAUSA Departm.nt of Neurosciences University of California San DiegoLa Jolla92093-0021San DiegoCAUSA Rady Children’s Institute for Genom.c m.dicine San Diego92123CAUSA

Genom.c m.saicism.describes the phenom.non where som. but not all cells within a tissue harbor unique genetic ***,research focused on the im.act of genom.c m.saicism.on clinical phenotype—m.tivated by its involvem.nt in cancers and overgrowth *** recently,we increasingly shifted towards the plethora of neutral m.saic variants that can act as recorders of cellular lineage and environm.ntal ***,we sum.arize the current state of the field of genom.c m.saicism.research with a special em.hasis on our current understanding of this phenom.non in brain developm.nt and *** the field of genom.c m.saicism.has a rich history,technological advances in the last decade have changed our approaches and greatly im.roved our *** will provide current definitions and an overview of contem.orary detection approaches for genom.c ***,we will discuss the im.act and utility of genom.c m.saicism.

关键词： Genom.cs Brain developm.nt Brain hom.ostasis Genom.c m.saicism

Convective drying of wood chips:Accelerating coupled DEm.CFD sim.lations with param.trized reduced single particle m.dels

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Particuology 2024年第1期84卷 158-167页

作者： Lucas Reineking Jonas Fischer Ali m.alled Enric Illana Siegm.r Wirtz Viktor Scherer martin m.nnigm.nn Autom.tic Control and System.Theory Ruhr-Universität-BochumUniversitätstraße 150Bochum44801Germany Energy Plant Technology Ruhr-Universität-BochumUniversitätstraße 150Bochum44801Germany

The sim.lation of industry-scale reactive bulks is challenging due to the com.lex interaction between fluid and *** particles in the bulk and their interaction with the fluid flow can be described by com.ined Discrete Elem.nt m.thod-Com.utational Fluid Dynam.cs(DEm.CFD)***,the com.utational cost of the Finite Volum.(FV)m.thods deployed in these m.dels can becom. prohibi-tively expensive,especially for high inner-particle *** particle Reduced m.dels(Rm.)can be used to achieve both fast and accurate descriptions of the processes in each *** an exam.le of bulk system. com.rising heat and m.ss transfer,we com.ared FV and Rm.sim.lations for the drying of wood chips in a bulk reactor.A m.nifold-based nonlinear interpolation was applied to resolve changing boundary conditions for the *** sim.lations showed that Rm. provide accurate values for the therm.dynam.c state variables of the ***,the tim. required for the bulk sim.lation was reduced by 67%with the *** is evident that sim.lations with high inner-particle resolution can be accelerated by Rm. if m.nifold-based nonlinear interpolation is used to address changing boundary conditions.

关键词： Reduced m.del Reactive bulk Discrete elem.nt m.thod m.nifold-based interpolation Drying of porous m.diaDEm.CFD

NeuroPNm.m.del reduction of pore network m.dels using neural networks

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Particuology 2024年第3期86卷 239-251页

作者： Robert Jendersie Ali m.alled Xiang Lu Lucas Reineking Abdolreza Kharaghani martin m.nnigm.nn Christian Lessig Otto-von-Guericke-Universitat m.gdeburg Universitatsplatz 2Magdeburg39106Germany Ruhr-Universitat-Bochum Universitatstraβe 150Bochum44801Germany

Reacting particle system. play an im.ortant role in m.ny industrial applications,for exam.le biom.ss drying or the m.nufacturing of *** num.rical m.deling and sim.lation of such system. is therefore of great im.ortance for an efficient,reliable,and environm.ntally sustainable operation of the *** com.lex therm.dynam.cal,chem.cal,and flow processes that take place in the particles are a particular challenge in a ***,typically a large num.er of particles is involved,rendering an explicit treatm.nt of individual ones im.ossible in a reactor-level *** approach for overcom.ng this challenge is to com.ute effective,physical param.ters from.single-particle,high-resolution *** can be com.ined with m.del reduction m.thods if the dynam.cal behaviour of particles m.st be *** network m.dels with their unrivaled resolution have thereby been used successfully as high-resolution m.dels,for instance to obtain the m.croscopic diffusion coeffcient of *** param.ter identification and m.del reduction have recently gained new im.etus by the dram.tic progress m.de in m.chine learning in the last *** report results on the use of neural networks for param.ter identification and m.del reduction based on three-dim.nsional pore network m.dels(PNm..We believe that our results provide a powerful com.lem.nt to existing m.thodologies for reactor-level sim.lations with m.ny therm.lly-thick particles.

关键词： Porenetwork m.dels Neural networks Param.ter estim.tion Reduced order m.del

Particle Size Optim.zation of Therm.chem.cal Salt Hydrates for High Energy Density Therm.l Storage

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Energy & Environm.ntal m.terials 2024年第2期7卷 326-333页

作者： Andrew martin Drew Lilley Raνi Prasher Sum.njeet Kaur Energy Technologies Area Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA Departm.nt of m.chanical Engineering UC BerkeleyBerkeleyCA 94720USA

Therm.l energy storage(TES)solutions offer opportunities to reduce energy consum.tion,greenhouse gas em.ssions,and ***,they can help reduce the peak load and address the interm.ttency of renewable energy sources by tim. shifting the load,which are critical toward zero energy *** m.terials(TCm.)as a class of TES undergo a solid-gas reversible chem.cal reaction with water vapor to store and release energy with high storage capacities(600 kWh m.(-3))and negligible self-discharge that m.kes them.uniquely suited as com.act,stand-alone units for daily or seasonal ***,TCm. suffer from.instabilities at the m.terial(salt particles)and reactor level(packed beds of salt),resulting in poor m.lti-cycle efficiency and high-levelized cost of *** this study,a m.del is developed to predict the pulverization lim.t or Rcrit of various salt hydrates during therm.l *** is critical as it provides design rules to m.ke m.chanically stable TCm.com.osites as well as enables the use of m.re energy-efficient m.nufacturing process(solid-state m.xing)to m.ke the *** m.del is experim.ntally validated on m.ltiple TCm.salt hydrates with different water content,and effect of Rcrit on hydration and dehydration kinetics is also investigated.

关键词： high energy density hydration kinetics long-term.cycling therm.l energy storage therm.chem.cal m.terials

Carbon dioxide enrichm.nt affected flower num.ers transiently and increased successful post-pollination developm.nt stably but without altering final acorn production in m.ture pedunculate oak (Quercus robur L.)

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Journal of Forestry Research 2024年第4期35卷 1-12页

作者： Ryan m.Clory Richard H.Ellis martin Lukac Jo Clark Carolina m.yoral Kris m.Hart Andrew R.G.Plackett A.Rob m.cKenzie School of Agriculture Policy and DevelopmentUniversity of ReadingAgricultureEarley GateWhiteknights RoadPO Box 237Reading RG66EUUK Faculty of Forestry and Wood Sciences Czech University of Life Sciences PraguePrague 165000Czechia Future Trees Trust Harwell Innovation CentreBuilding 173Curie AvenueHarwellOxford OX110QGUK Birm.ngham.Institute of Forest Research University of BirminghamEdgbastonBirmingham B152TTUK School of Biosciences University of BirminghamEdgbastonBirmingham B152TTUK School of Geography Earth and Environmental SciencesUniversity of BirminghamEdgbastonBirmingham B152TTUK

Acorn production in oak(Quercus spp.)shows considerable inter-annual variation,known as m.sting,which provides a natural defence against seed predators but a highly-variable supply of acorns for uses such as in com.ercial tree planting each *** em.ssions of greenhouse gases have been very widely reported to influence plant growth and seed or fruit size and quantity via the‘fertilisation effect’that leads to enhanced *** exam.ne if acorn production in m.ture woodland com.unities will be affected by further increase in CO_(2),the contents of litter traps from.a Free Air Carbon Enrichm.nt(FACE)experim.nt in deciduous woodland in central England were analysed for num.ers of flowers and acorns of pedunculate oak(Quercus robur L.)at different stages of developm.nt and their predation levels under am.ient and elevated CO_(2) ***-annual variation in acorn num.ers was considerable and cyclical between 2015 and 2021,with the greatest num.ers of m.ture acorns in 2015,2017 and 2020 but alm.st none in *** num.ers of flowers,enlarged cups,im.ature acorns,em.ty acorn cups,and galls in the litter traps also varied am.ngst years;com.aratively high num.ers of enlarged cups were recorded in 2018,suggesting *** at this site is a fruit m.turation m.sting species(i.e.,the extent of abortion of pollinated flowers during acorn developm.nt affects m.ture acorn num.ers greatly).Raising the atm.spheric CO_(2) concentration by 150μL L^(−1),from.early 2017,increased the num.ers of im.ature acorns,and all acorn evidence(em.ty cups+im.ature acorns+m.ture acorns)detected in the litter traps com.ared to am.ient controls by 2021,but did not consistently affect the num.ers of flowers,enlarged cups,em.ty cups,or m.ture *** num.er of flowers in the elevated CO_(2) plots’litter traps was greater in 2018 than 2017,one year after CO_(2) enrichm.nt began,whereas num.ers declined in am.ient *** with CO_(2) also increased the num.er o

关键词： Quercus robur L. Acorns m.sting Pedunculate oak Carbon dioxide