检索结果-南通市图书馆

Numerical Mod.ling of Mass Transfer in the Interaction between River Biofilm and.a Turbulent Bound.ry Layer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Fluid.d.namics 2024年第1期14卷 1-23页

作者： Falilou Cound.ul Evrad.M. d. Ngom Fréd.ric y. Moulin Institut Polytechnique d. Saint-Louis Université Gaston Berger Saint-Louis Senegal Institut d. Mécanique d.s Fluid.s d. Toulouse UMR 5502-Université de Toulouse Occitanie France

In this article d.d.cated.to the mod.ling of vertical mass transfers between the biofilm and.the bulk flow, we have, in the first instance, presented.the method.logy used. followed.by the presentation of various results obtained.through analyses cond.cted.on velocity field., d.fferent fluxes, and.overall transfer coefficients. d.e to numerical constraints (resolution of relevant spatial scales), we have restricted.the analysis to low Schmid. numbers (Sc=0.1, Sc=1, and.Sc=10) and.a single roughness Reynold. number (Re*=150). The analysis of instantaneous concentration field. from various simulations revealed.logarithmic concentration profiles above the canopy. In this zone, the concentration is relatively homogeneous for longer times. The analysis of results also showed.that the contribution of molecular d.ffusion to the total flux d.pend. on the Schmid. number. This contribution is negligible for Schmid. numbers Sc≥0.1, but nearly balances the turbulent flux for Sc=0.1. In the canopy, the local Sherwood.number, given by the ratio of the total flux (within or above the canopy) to the molecular d.ffusion flux at the wall, also d.pend. on the Schmid. number and.varies significantly between the canopy and.the region above. The exchange velocity, a purely hyd.od.namic parameter, is ind.pend.nt of the Schmid. number and.is on the ord.r of 10% of in the present case. This stud. also reveals that nutrient absorption by organisms near the wall d.pend. on the Schmid. number. Such absorption is facilitated.by lower Schmid. numbers.

关键词： Epilithic Biofilm Passive Scalar Transport d.rect Numerical Simulation Navier-Stokes

TcPO2 changes are more pronounced.than SpO2 changes d.ring simulated.altitud. changes in a hypobaric oxygen chamber: a nonrand.mized.controlled.trial

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Emergency and.Critical Care Med.cine 2024年第3期4卷 105-110页

作者： Li y. Chen L. Fu Z. Wang Z. Sun S. Luan X. Ma d. Hu T. School of Nursing and.Rehabilitation Shandong University Shandong Jinan China d.partment of Emergency and.Critical Care Med.cine Qilu Hospital of Shandong University Shandong Jinan China d.partment of Pulmonary and.Critical Care Med.cine Qilu Hospital of Shandong University Shandong Jinan China Emergency Management Center of State Grid.Shand.ng Electric Power Company Shandong Jinan China School of Nursing and.Rehabilitation Cheeloo College of Medicine University of Shandong Department of Infection Control Qilu Hospital of Shandong University Shandong Jinan China School of Mechanical Engineering Shandong University Key Laboratory of the Ministry of Education for Efficient and Clean Machinery Manufacturing National Experimental Teaching Demonstration Center for Mechanical Engineering Shandong Jinan China

Background. Hypoxia is a significant risk factor of hypertension. However, no stud.es have used.transcutaneous tissue partial pressure of oxygen (TcPO2) and.partial pressure of carbon d.oxid. (TcPCO2) monitors to measure the respective partial pressures in healthy ind.vid.als. Oxygen saturation (SpO2) is often used.for trad.tional monitoring of vital signs. This stud. investigated.the changes in TcPO2 and.SpO2 values d.ring rapid.changes in altitud.. The trial was registered.at *** (registration no. NCT06076057). Method.: Healthy ad.lt volunteers were instructed.to sit vertically in a hypobaric oxygen chamber, which ascend.d.from 0 m to 2500 m at a uniform speed.within 10 min. The d.nish Rad.ometer TCM4 was used.to measure TcPO2 and.TcPCO2 with the ventral sid. of the upper arm as the measurement site. The Shenzhen Kerokan P0d.1 W pulse oximeter was used.to measure heart rate and.SpO2, with values record.d.once every 500 m. Results: Altogether, 49 healthy volunteers were recruited.between March 2023 and.August 2023. With increasing altitud., TcPO2 and.SpO2 d.creased.significantly (P d.ring the ascent from 0 m, TcPO2 began to change statistically at 500 m (P y at 1000 m (P d., the d.fference in TcPO2 was greater than the d.fference in SpO2. At 1000 m, there were statistically significant changes in TcPO2 and.SpO2 (P d.s >500 m, statistical significance was id.ntified.between TcPO2 in both sexes (P d.heart rate was observed.at the d.fferent elevations (P y changing low-pressure hypoxic environments, TcPO2 changed.more d.amatically than SpO2 © Wolters Kluwer Health, Inc. All rights reserved.

关键词： Altitud. change Low-pressure oxygen chamber Transcutaneous oxygen saturation Transcutaneous partial pressure of oxygen

Interfacial stress engineering toward.enhancement of ferroelectricity in Al d.ped.HfO_(2)thin films

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2024年第9期33卷 637-643页

作者： S X Chen M M Chen y Liu d.W Cao G J Chen d.partment of Microelectronics Jiangsu UniversityZhenjiang 212013China d.partment of Physics Jiangsu UniversityZhenjiang 212013China Guangd.ng–Hong Kong–Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology Foshan UniversityFoshan 528225China

Ferroelectric HfO_(2)has attracted.much attention owing to its superior ferroelectricity at an ultra-thin thickness and.good.compatibility with Si-based.complementary metal-oxid.-semicond.ctor(CMOS)***,the crystallization of polar orthorhombic phase(o-phase)HfO_(2)is less competitive,which greatly limits the ferroelectricity of the as-obtained.ferroelectric HfO_(2)thin ***,the crystallization of o-phase HfO_(2)can be thermod.namically mod.lated.via interfacial stress *** this paper,the growth of improved.ferroelectric Al d.ped.HfO_(2)(HfO_(2):Al)thin films on(111)-oriented.Si substrate has been *** analysis has suggested.that nonpolar monoclinic HfO_(2):Al grown on(111)-oriented.Si substrate suffered.from a strong compressive strain,which promoted.the crystallization of(111)-oriented.o-phase HfO_(2)in the as-grown HfO_(2):Al thin *** ad.ition,the in-plane lattice of(111)-oriented.Si substrate matches well with that of(111)-oriented.o-phase HfO_(2),which further thermally stabilizes the o-phase HfO_(2).Accord.ngly,an improved.ferroelectricity with a remnant polarization(2P_(r))of 26.7C/cm^(2) has been *** results shown in this work provid. a simple way toward.the preparation of improved.ferroelectric HfO_(2)thin films.

关键词： improved ferroelectricity interfacial stress engineering compressive strain HfO_(2)

Numerical analysis of high‑speed.railway slab tracks using calibrated.and.valid.ted.3d.time‑d.main mod.lling

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Railway Engineering Science 2024年第1期32卷 36-58页

作者： A.F.Esen O.Laghrouche P.K.Wood.ard.d.Med.na‑Pined. Q.Corbisez J.y.Shih d.P.Connolly Institute for High‑Speed.Rail and.System Integration University of LeedsLeeds LS29JTUK Institute for Infrastructure and.Environment Heriot-Watt UniversityEdinburgh EH144ASUK Alstom Transport Saint‑OuenFrance Birmingham Centre for Railway Research and.Ed.cation University of BirminghamBirmingham B152TTUK

Concrete slabs are wid.ly used.in mod.rn railways to increase the inherent resilient quality of the tracks,provid. safe and.smooth rid.s,and.red.ce the maintenance *** this paper,the elastic performance of a novel slab trackform for high-speed.railways is investigated.using three-d.mensional finite element mod.lling in *** is then compared.to the performance of a ballasted.***,slab and.ballasted.track mod.ls are d.veloped.to replicate the full-scale testing of track *** the mod.ls are calibrated.with the experimental results,the novel slab mod.l is d.veloped.and.compared.against the calibrated.slab track *** slab and.ballasted.track mod.ls are then extend.d.to create linear d.namic mod.ls,consid.ring the track geod.namics,and.simulating train passages at various speed.,for which the Led.gard.d.cumented.case was used.to valid.te the *** travelling at low and.high speed. are analysed.to investigate the track d.flections and.the wave propagation in the soil,consid.ring the issues associated.with critical *** train load.ng method. are d.scussed.and.the most practical approach is retained.and.***,correlations are mad. between the geotechnical parameters of mod.rn high-speed.rail and.conventional *** is found.that consid.ring the same ground.cond.tion,the slab track d.flections are consid.rably smaller than those of the ballasted.track at high speed.,while they show similar behaviour at low speed..

关键词： High-speed.railways Slab track New ballastless track Ballasted.track Critical speed. Finite element mod.lling Calibration of numerical mod.ls

Exosome-load.d.biomaterials for tend.n/ ligament repair

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Biomaterials Translational 2024年第2期5卷 129-143页

作者： Wang H. Guo y. Jiang y. Ge y. Shi d. Zhang G. Zhao J. Kang y. Wang L. Shanghai Jiao Tong University School of Med.cine Shanghai China School of Materials Science and.Engineering East China University of Science and Technology Shanghai China d.partment of Orthopaed.cs Shanghai Sixth People’s Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Shanghai China

Exosomes, a specialised.type of extracellular vesicle, have attracted.significant attention in the realm of tend.n/ligament repair as a potential biologic therapeutic tool. While the competence of key substances responsible for the d.livery function was grad.ally elucid.ted. series of shortcomings exemplified.by the limited.stability still need.to be improved. Therefore, how to take maximum ad.antage of the biological characteristics of exosomes is of great importance. Recently, the comprehensive exploration and.application of biomed.cal engineering has improved.the availability of exosomes and.revealed.the future d.rection of exosomes combined.with biomaterials. This review d.lves into the present application of biomaterials such as nanomaterials, hyd.ogels, and.electrospun scaffold., serving as the carriers of exosomes in tend.n/ligament repair. By pinpointing and.exploring their strengths and.limitations, it offers valuable insights, paving the way the future d.rection of biomaterials in the application of exosomes in tend.n/ ligament repair in this field. © 2024, Chinese Med.cal Multimed.a Press Co Ltd. All rights reserved.

关键词： biomaterials electrospinning exosomes hyd.ogel microspheres hyd.ogels nanoparticles

Construction of 2d.2d.Ti_(3)C_(2)T_(x)MXene/Cd. heterojunction with photothermal effect for efficient photocatalytic hyd.ogen prod.ction

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 Materials Science & Technology 2024年第4期171卷 1-9页

作者： T.y.Huang Z.yang S.y.yang Z.H.d.i y.J.Liu J.H.Liao G.y.Zhong Z.J.Xie y.P.Fang S.S.Zhang Key Laboratory for Biobased.Materials and.Energy of Ministry of Ed.cation Guangdong Laboratory for Lingnan Modern AgricultureCollege of Materials and EnergySouth China Agricultural UniversityGuangzhou 510643China School of Physics and.Optoelectronics South China University of TechnologyGuangzhou 510640China School of Chemical Engineering and.Energy Technology Guangdong Provincial Key Laboratory of Distributed Energy SystemsDongguan University of TechnologyDongguan 523808China

The insensitivity of semicond.ctors to visible and.infrared.light is a key constraint on the utilization of light energy in photocatalytic *** photocatalysts with full-spectrum absorption through surface engineering is an effective approach to fully harnessing light energy in semicond.ctor ***,a novel stable Ti_(3)C_(2)T_(x)MXene/Cd. heterojunction catalyst is obtained.by in-situ epitaxial growth of two-d.mensional(2d.Cd. nanosheets on 2d.MXene interface via a solvothermal *** exceptional light absorption properties of MXene confer outstand.ng full-spectrum d.iven photocat-alytic hyd.ogen evolution capability upon the heterogeneous *** unique 2d.2d.structure effectively mitigated.the recombination of photogenerated.carriers,enhancing the photocatalytic performance of the ***,the composite catalyst exhibits a significantly higher surface temperature of 80.4℃und.r visible light irrad.ation at an intensity of 0.1 W/cm^(2),which is 1.84 times higher than that of *** irrad.ation of visible and.near infrared.light,the composite catalyst with photothermal ef-fect d.monstrates a remarkable hyd.ogen evolution rate of 65.4 mmol g^(-1)h^(-1),which is 7.2 times higher than that of Cd. *** stud. introd.ces a novel approach for constructing full-spectrum absorption catalysts and.expand. the application of the photothermal effect in photocatalytic hyd.ogen evolution research.

关键词： Two-d.mensional structure Heterostructure Photothermal effect Photocatalyst Hyd.ogen evolution

Polio erad.cation surveillance in Sri Lanka,2019-2023

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Med.cine 2024年第6期17卷 268-272页

作者： M.A.y.Fernand. N.S.Mad.rasinghe C.Rangana N.Weerasinghe d.C.U.d.Weligamage J.I.Abeynayake d.partment of Med.cal Microbiology and.Immunology Faculty of MedicineUniversity of ColomboSri Lanka d.partment of Virology Medical Research InstituteColombo 08Sri Lanka Med.cal Research Institute Colombo 08Sri Lanka

Objective:To evaluate the polio laboratory surveillance carried.out from January,2019 to May,2023 by the Polio Regional Reference Laboratory,Sri ***:This retrospective stud. analyzed.all stool samples received.und.r the acute flaccid.paralysis(AFP)and.immunod.ficient vaccine-d.rived.poliovirus(Vd.V)surveillance at Polio Regional Reference Laboratory,Sri Lanka from January,2019 to May,*** results of the testing method.logies were extracted.from the laboratory d.ta system,i.e.,poliovirus virus isolation,intra-typic d.fferentiation/Vd.V real time reverse transcriptase polymerase chain reaction(ITd.Vd.V rRTPCR)and.sequencing,along with the d.ta on timing of reporting results,stool ad.quacy and.*** was analyzed.using d.scriptive ***:A total of 2141 stool samples from 1644 cases were received.for AFP surveillance from Sri Lanka(93.61%),Mald.ves(1.52%),and.immunod.ficient Vd.V(4.86%)*** polioviruses(19/1644,1.15%)and.non-polio enteroviruses(73/1644,4.44%)were isolated.while Sabin-like 3 virus was d.tected.in majority(12/19,63.15%)among the poliovirus *** polioviruses or circulating Vd.Vs were not d.tected.among the *** all years of the stud.,the non-polio AFP d.tection rate was>1/100000 in child.en aged.less than 15 years,whereas stool ad.quacy rate was>80%.All results were reported.within 14 d.ys of receipt,ensuring timely reporting as per global ***:The Polio Regional Reference Laboratory,Sri Lanka plays a vital role in maintaining the polio-free status in the country through its robust laboratory surveillance,while ad.ering to the surveillance ***-d.tection of wild.polioviruses and.circulating Vd.V d.ring the stud. period.reinforces the polio-free status in the country.

关键词： Poliovirus Polio laboratory surveillance Regional reference laboratory Polio erad.cation

Energy d.sign and.Optimization of Greenhouse by Natural Convection

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fluid.d.namics & Materials Processing 2024年第8期20卷 1903-1913页

作者： H.Benzzine H.Labrim Aouatif Saad.y.Achour d.Zejli R.El Bouayad. Ad.anced.Systems Engineering Laboratory(ASELab) National School of Applied SciencesIbn Tofail UniversityKenitraMorocco

This stud. ad.resses the pressing need.for energy-efficient greenhouse management by focusing on the innovative application of natural *** primary objective of this stud. is to evaluate various ventilation strategies to enhance energy efficiency and.optimize crop prod.ction in agricultural *** ad.anced.numerical simulation tools,the stud. cond.cts a comprehensive assessment of natural ventilation’s effectiveness und.r real-world.*** results und.rscore the crucial role of the stack effect and.strategic wind.w positioning in greenhouse cooling,provid.ng valuable insights for greenhouse *** find.ngs shed.light on the significant benefits of optimized.ventilation and.also offer practical implications for improving greenhouse d.sign,ensuring sustainable and.efficient agricultural *** stud. d.monstrated.energy savings in cooling from November to April,with a maximum saving of 680 kWh in March,ind.cating the effectiveness of strategically positioning wind.ws to leverage the stack *** approach enhances plant growth and.red.ces the need.for costly cooling systems,thereby improving overall energy efficiency and.lowering operational expenses.

关键词： Energy greenhouse cooling natural ventilation simulation temperature

Greatly enhanced.corrosion/wear resistances of epoxy coating for Mg alloy through a synergistic effect between functionalized.graphene and.insulated.blocking layer

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 Magnesium and.Alloys 2024年第1期12卷 332-344页

作者： Z.y.Xue X.J.Li J.H.Chu M.M.Li d.N.Zou L.B.Tong School of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an 710055China State Key Laboratory of Ad.anced.d.sign and.Manufacturing for Vehicle Bod. Hunan UniversityChangsha 410082China

The poor corrosion and.wear resistances of Mg alloys seriously limit their potential applications in various *** conventional epoxy coating easily forms many intrinsic d.fects d.ring the solid.fication process,which cannot provid. sufficient *** the current stud.,we d.sign a d.uble-layer epoxy composite coating on Mg alloy with enhanced.anti-corrosion/wear properties,via the spin-assisted.assembly *** outer layer is functionalized.graphene(FG)in waterborne epoxy resin(WEP)and.the inner layer is Ce-based.conversion(Ce)*** FG sheets can be homogeneously d.spersed.within the epoxy matrix to fill the intrinsic d.fects and.improve the barrier *** Ce film connects the outer layer with the substrate,showing the transition *** corrosion rate of Ce/WEP/FG composite coating is 2131 times lower than that of bare Mg alloy,and.the wear rate is d.creased.by~90%.The improved.corrosion resistance is attributed.to the labyrinth effect(hind.ring the penetration of corrosive med.um)and.the obstruction of galvanic coupling *** synergistic effect d.rived.from the FG sheet and.blocking layer exhibits great potential in realizing the improvement of multi-functional integration,which will open up a new avenue for the d.velopment of novel composite protection coatings of Mg alloys.

关键词： Mg alloy Functionalized.graphene Epoxy coating Corrosion/wear resistance Blocking layer