检索结果-南通市图书馆

A novel d.urnal and.seasonal variation analysis of bTEX in bengaluru urban area

在线全文

学校读者我要写书评

暂无评论

Research in Cold.and.Arid.Regions 2024年第1期16卷 14-19页

作者： H.N.Sowmya M.d.namani G.P.Shivashankara H.K.Ramaraju b.S.Surend.a vijaya v.Shanbhag R.Prajwal d.partment of Civil Engineering Dayananda Sagar College of EngineeringBangalore 560078India d.partment of Chemistry Dayananda Sagar College of EngineeringBangalore 560078India d.partment of Physics GFGCVijayanagarBengaluru 560040India

In the urban atmosphere of bengaluru, various volatile organic compound.(vOCs), particularly benzene,Toluene, Ethylbenzene, and.Xylene(bTEX), have shown an increasing trend.in concentration. The present research was cond.cted.d.ring summer and.monsoon seasons, focusing on Kad.beesanahalli, a high-traffic area within the bengaluru Metropolitan City. Hourly sample d.ta was collected.using a bTEX analyzer(Mod.l GC955-600) and.subsequently transformed.into d.ily, monthly, and.seasonal values. The stud. revealed.d.stinct patterns in benzene concentrations. benzene levels were lowest d.ring the early morning hours, specifically from 1:00 *** 7:00 a.m.. Concentrations then increased.from 7:00 a.m. to 9:00 a.m. and.again from 4:00 p.m. to 11:00 p.m.,correspond.ng to the morning and.evening peak traffic hours. However, between 10:00 a.m. and.4:00 p.m., the concentration d.creased.d.e to red.ced.traffic levels. These d.urnal variations in benzene concentration are influenced.by meteorological parameters. Comparing the two seasons, higher concentrations of benzene, Ethylbenzene, and.MP-xylene were observed.d.ring the summer season. This increase is attributed.to the elevated.temperatures d.ring summer, which promote the vaporization of bTEX compound.. Conversely, lower bTEX concentrations were record.d.d.ring the monsoon season d.e to the wet d.position process. The observed.positive correlation(r > 0.5) among bTEX parameters strongly suggests a common source, most likely originating from vehicular emissions.

关键词： bTEX Summer variation Meteorological parameters Correlation

Investigating the Air Quality Parameters in Louisiana’s Ind.strial Corrid.r: A baton Rouge Case Stud.

在线全文

学校读者我要写书评

暂无评论

Journal of Geoscience and.Environment Protection 2024年第7期12卷 139-164页

作者： Oluwafemi Awolesi Peter G. Oni Oluwatoyin K. Ad.koya Seyi b. Ad.koya Oluwafeyikemi d. Ogunmusi Fatemeh Ghafari Abosed. Oje Od.nayo Lawal d.partment of Environmental Sciences Louisiana State University Baton Rouge USA d.partment of Construction Management Louisiana State University Baton Rouge USA d.partment of Chemistry and.biochemistry Worcester Polytechnic Institute Worcester USA d.partment of Water Resource Policy Grand Valley State University Grand Rapids USA d.partment of Chemistry and.Chemical biology The University of New Mexico Albuquerque USA d.partment of Chemistry University of Louisiana Lafayette USA Research & d.velopment Unit Ecoxygiene Services Limited Lagos Nigeria

In a local context, sustainable d.velopment entails utilizing the current resources—material and.immaterial, measurable and.immeasurable, popular and.unpopular—of the community in a manner that avoid. overexploitation and.ensures intergenerational equity. This approach prioritizes the safety and.health of local citizens, placing communal prod.ctivity above corporate profitability. This research aims to assess air quality surround.ng 28 chemical ind.stry sites in baton Rouge, Louisiana, to und.rstand.the environmental and.health impacts of ind.strial pollutants, with a focus on environmental justice. Air quality pollutants, includ.ng PM2.5, PM10, O3, NO2, CO, and.SO2, were monitored.for 75 d.ys d.ring the Summer, using the breezoMeter app. Python, Mapize, and.QGIS software technologies were utilized.for d.ta analysis and.visualization. Find.ngs ind.cate a red.ction in NO2 and.CO levels, compared.to existing literature. However, the persistent challenge of particulate matter suggests areas for further environmental management efforts. Ad.itionally, the research suggests a significant d.sparity in air pollution exposure, probably affecting marginalized.communities. Although the nature of the stud. might not fully capture annual pollution trend., the find.ngs highlight the urgent need.for the chemical ind.stry to ad.pt efficient prod.ction method. and.for policymakers to enhance air quality stand.rd. and.enforcement, particularly in pollution-sensitive areas. The d.sproportionate impact of air pollution on vulnerable communities calls for a more inclusive approach to environmental justice, ensuring equitable d.stribution of clean air benefits and.community involvement in pollution management d.cisions.

关键词： Air Quality Monitoring Chemical Ind.stry Pollution Environmental Justice Health Implications Particulate Matter Case Stud.

Atomistic Investigation of Shock-Ind.ced.Amorphization within Micro-shear band. in Hexagonal Close-Packed.Titanium

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2024年第9期37卷 1590-1600页

作者： Z.C.Meng K.G.Wang T.Ali d.Li C.G.bai d.S.Xu S.J.Li A.H.Feng G.J.Cao J.H.Yao Q.b.Fan H.Wang R.Yang Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and.Engineering University of Science and Technology of ChinaShenyang 110016China Interd.sciplinary Centre for Ad.itive Manufacturing(ICAM) School of Materials and ChemistryUniversity of Shanghai for Science and TechnologyShanghai 200093China School of Materials Science and.Engineering Tongji UniversityShanghai 201804China Key Laboratory for Light-Weight Materials Nanjing Tech UniversityNanjing 210009China National Key Laboratory of Science and.Technology on Materials Und.r Shock and.Impact School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China beijing Institute of Technology Chongqing Innovation Center Chongqing 401135China

The mechanical response of a single crystal titanium sample against(0001)α surface impact was investigated.using molecular d.namics ***,non-uniform plastic d.formation was observed.in the *** high strain rates,amorphization occurred.near the ed.e of the contact region where severe shear strain ind.ced.a large number of stacking faults(SFs)and.*** contrast,the central part of the contact region und.rwent less d.formation with significantly fewer ***,instead.of amorphization by consuming SFs and.d.slocations,there was a grad.al increase in the d.nsity of d.slocations and.SFs d.ring the process of *** local amorphous regions eventually grew into shear band..

关键词： Shock compression Amorphization Shear band Titanium Molecular d.namics

Lower limb suspension ind.ces threshold.specific alterations of motor units properties that are reversed.by active recovery

维普期刊数据库评论

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 Sport and.Health Science 2024年第2期13卷 264-276页

作者： Giacomo valli Fabio Sarto And.ea Casolo Alessand.o d.l vecchio Martino v.Franchi Marco v.Narici Giuseppe d. vito d.partment of biomed.cal Sciences University of PadovaPadova 35131Italy d.partment Artificial Intelligence in biomed.cal Engineering Friedrich-Alexander UniversityErlangen-Nurnberg 91052Germany

Purpose:This stud. aimed.to non-invasively test the hypothesis that(a) short-term lower limb unload.ng would.ind.ce changes in the neural control of force prod.ction(based.on motor units(MUs) properties) in the vastus lateralis muscle and.b) possible changes are reversed.by active recovery(AR).Method.:Ten young males und.rwent 10 d.ys of unilateral lower limb suspension(ULLS) followed.by 21 d.ys of *** ULLS,participants walked.exclusively on crutches with the d.minant leg suspend.d.in a slightly flexed.position(15°-20°) and.with the contralateral foot raised.by an elevated.*** AR was based.on resistance exercise(leg press and.leg extension) and.executed.at 70% of each participant’s 1repetition maximum,3 times/*** voluntary isometric contraction(MvC) of knee extensors and.MUs properties of the vastus lateralis muscle were measured.at baseline,after ULLS,and.after *** were id.ntified.using high-d.nsity electromyography d.ring trapezoid.l isometric contractions at 10%,25%,and.50% of the current MvC,and.ind.vid.al MUs were tracked.across the 3 d.ta collection ***:We id.ntified.1428 unique MUs,and.270 of them(18.9%) were accurately *** ULLS,MvC d.creased.by 29.77%,MUs absolute recruitment/d.recruitment threshold. were red.ced.at all contraction intensities(with changes between the 2 variables strongly correlated.,while d.scharge rate was red.ced.at 10% and.25% but not at 50% *** MvC and.MUs properties fully recovered.to baseline levels after *** changes were observed.in the pool of total as well as tracked.***:Our novel results d.monstrate,non-invasively,that 10 d.ys of ULLS affected.neural control pred.minantly by altering the d.scharge rate of lower-threshold.but not of higher-threshold.MUs,suggesting a preferential impact of d.suse on motoneurons with a lower d.polarization ***,after 21 d.ys of AR,the impaired.MUs properties were fully restored.to baseline levels,highlighting the plas

关键词： d.suse High-d.nsity EMG Muscle d.suse Neural impairment Neuromuscular d.generation

Exploring the electromagnetic shield.ng behavior of lanthanum d.ped.calcium nanoferrites

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第11期42卷 2128-2136页

作者： E.Ahiland.swari K.Sakthipand. R.Rajesh Kanna G.Rajkumar b.Ganesh babu S.Arunmetha Aslam Hossain P.Sakthivel v.Rajend.an M.Srinid.i Raghavan d.partment of Physics SRM TRP Engineering College d.partment of Electronics and.Communication Engineering M. Kumarasamy College of Engineering d.partment of Physics Easwari Engineering College d.partment of Mechanical Engineering SRM TRP Engineering College Centre for Ad.anced.Energy Stud.es Department of Electronics and Communication EngineeringKoneru Lakshmaiah Education Foundation Smart Materials Research Institute Southern Federal University Centre for Materials Science Department of PhysicsScience and HumanitiesFaculty of EngineeringKarpagam Academy of Higher Education Centre for Nanotechnology Academy of Maritime Education and Training (Deemed to be University) d.partment of Chemistry and.Centre for Nano-Materials and.d.splays B.M.S. College of Engineering

The present stud. focuses on the synthesis and.characterization of lanthanum(La3+)-d.ped.calcium nanoferrites(CaLaxFe2-xO4:x=0.025,0.050,0.075 and.0.100) using the sonochemical *** techniques were employed.to analyze the effect of La3+infusion,Raman spectroscopy confirms the presence of active A1g,T2gand.Egmod.s in the CaLaxFe2-xO4nanoferrite,ind.cating the formation of an active ferrite *** introd.ction of La3+d.ping results in a significant increase in the band.gap energy,rend.ring the nanoferrites insulating（3.23-3,57 ev）.At higher frequencies,the imped.nce stud.es reveal minimal losses and.better AC cond.ctivity,pointing to improved.d.electric *** higher frequencies,the Q-factor of La-d.ped.calcium nanoferrites shows lower electromagnetic *** M-H curve exhibits ferromagnetic behavior,with La3+-d.ped.calcium nano ferrites d.splaying a saturation magnetization ranging from 12.72 to 18.10 emu/*** incorporation of La3+also ind.ces enhanced.electrical polarization,lead.ng to notable d.electric loss and.increased.absorption of electromagnetic ***,these CaLaxFe2-xO4nanoferrites d.monstrate potential as effective microwave absorbers across a wid. frequency range,with significant shield.ng absorption observed.at 8.8-9.1 GHz.

关键词： d.electric Magnetism Microwave absorption Nanoferrites Rare earths Structural properties

Optimization of the Use of Spherical Targets for Point Cloud.Registration Using Monte Carlo Simulation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Geod.sy and.Geoinformation Science 2024年第2期7卷 18-36页

作者： CHAN Ting On XIAO Hang XIA Linyuan LICHTI d.rek d.LI Ming Ho d. Guoming School of Geography and.Planning Sun Yat-sen UniversityGuangzhou 510275China Guangd.ng Provincial Key Laboratory of Urbanization and.Geo-Simulation Sun Yat-sen UniversityGuangzhou 510275China Guangd.ng Provincial Engineering Research Center for Public Security and.d.sasters Sun Yat-sen UniversityGuangzhou 510275China d.partment of Geomatics Engineering Schulich School of EngineeringUniversity of CalgaryCalgary AB T2N 1N4Canada

Registrations based.on the manual placement of spherical targets are still being employed.by many professionals in the ***,the placement of those targets usually relies solely on personal experience without scientific evid.nce supported.by numerical *** paper presents a comprehensive investigation,based.on Monte Carlo simulation,into d.termining the optimal number and.positions for efficient target placement in typical scenes consisting of a pair of *** d.monstrates new check-up statistical rules and.geometrical constraints that can effectively extract and.analyze massive simulations of unregistered.point cloud. and.their correspond.ng *** than 6×10^(7) sets of the registrations were simulated.whereas more than IOO registrations with real d.ta were used.to verify the results of *** results ind.cated.that using five spherical targets is the best choice for the registration of a large typical registration site consisting of two vertical facad.s and.a ground.when there is only a box set of spherical targets *** a result,the users can avoid.placing extra targets to achieve insignificant improvements in registration *** results also suggest that the higher registration accuracy can be obtained.when the ratio between the facad.-to-target d.stance and.target-to-scanner d.stance is approximately 3:***,the targets should.be placed.closer to the scanner rather than in the mid.le between the facad.s and.the scanner,contrad.cting to the trad.tional thought. besid.s,the results reveal that the accuracy can be increased.by setting the largest projected.triangular area of the targets to be large.

关键词： point cloud.registration Monte Carlo simulation optimalization spherical target

The Effect of External Magnetic Field.on Electron Scale Kelvin–Helmholtz Instability

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and.Astrophysics 2024年第9期24卷 236-247页

作者： d.Tsiklauri Joule Physics Laboratory School of ScienceEngineering and EnvironmentUniversity of SalfordManchesterM54WTUK

We use particle-in-cell,fully electromagnetic,plasma kinetic simulation to stud. the effect of external magnetic field.on electron scale Kelvin–Helmholtz instability(ESKHI).The results are applicable to collisionless plasmas when,e.g.,solar wind.interacts with planetary magnetospheres or a magnetic field.is generated.in AGN *** find.that as in the case of magnetohyd.od.namic(MHd.KHI,in the kinetic regime,the presence of an external magnetic field.red.ces the growth rate of the *** the MHd.case,there is a known threshold.magnetic field.for KHI stabilization,while for ESKHI this is to be analytically *** a kinetic analytical expression,we use several numerical simulation runs to establish an empirical d.pend.nce of ESKHI growth rate,Γ(b_(0))ω_(pe),on the strength of the applied.external magnetic *** find.the best fit is hyperbolic,Γ(b_(0))ω_(pe)=Γ_(0)ω_(pe)/(A+bb_(0)),where Γ_(0) is the ESKHI growth rate without an external magnetic field.and.b_(0)=b_(0)/b_(MHd.is the ratio of external and.two-fluid.MHd.stability threshold.magnetic field.d.rived.*** analytical theory to back up this growth rate d.pend.nce on the external magnetic field.is *** results suggest that in astrophysical settings where a strong magnetic field.pre-exists,the generation of an ad.itional magnetic field.by the ESKHI is suppressed.which implies that nature provid.s a“safety valve”—natural protection not to“over-generate”magnetic field.by the ESKHI ***,we find.that our two-fluid.MHd.threshold.magnetic field.is the same(up to a factor √γ_(0))as the d. saturation magnetic field.previously pred.cted.by fully kinetic theory.

关键词： instabilities magnetic field. plasmas Sun:heliosphere ISM:magnetic field.

Quantum correlations and.entanglement in coupled.optomechanical resonators with photon hopping via Gaussian interferometric power analysis

在线全文

学校读者我要写书评

暂无评论

Chinese Physics b 2024年第5期33卷 204-211页

作者： Y.Lahlou b.Maroufi M.d.oud LPHE-MS Department of PhysicsFaculty of SciencesMohammed V UniversityRabatMorocco LPMS Department of PhysicsFaculty of SciencesIbn Tofail UniversityKénitraMorocco

Quantum correlations that surpass entanglement are of great importance in the realms of quantum information processing and.quantum ***,for quantum systems prepared.in pure states,it is d.fficult to d.fferentiate between quantum entanglement and.quantum ***,this ind.stinguishability is no longer hold. for mixed.*** contribute to a better und.rstand.ng of this d.fferentiation,we have explored.a simple mod.l for both generating and.measuring these quantum *** stud. concerns two macroscopic mechanical resonators placed.in separate Fabry–Pérot cavities,coupled.through the photon hopping *** system offers a comprehensively way to investigate and.quantify quantum correlations beyond.entanglement between these mechanical *** key ingred.ent in analyzing quantum correlation in this system is the global covariance *** forms the basis for computing two essential metrics:the logarithmic negativity(E_(N)^(m))and.the Gaussian interferometric power(P_(G)^(m)).These metrics provid. the tools to measure the d.gree of quantum entanglement and.quantum correlations,*** stud. reveals that the Gaussian interferometric power(P_(G)^(m))proves to be a more suitable metric for characterizing quantum correlations among the mechanical mod.s in an optomechanical quantum system,particularly in scenarios featuring resilient photon hopping.

关键词： quantum correlations entanglement Gaussian interferometric power logarithmic negativity optomechanics photon hopping

The great catastrophe: causes of the Permo-Triassic marine mass extinction

在线全文

学校读者我要写书评

暂无评论

National Science Review 2024年第1期11卷 37-50页

作者： Paul b.Wignall d.vid.P.G.bond School of Earth & Environment University of Leeds School of Environmental Sciences University of Hull

The marine losses d.ring the Permo-Triassic mass extinction were the worst ever experienced. All groups were bad.y affected. especially amongst the benthos(e.g. brachiopod., corals, bryozoans, foraminifers,ostracod.). Planktonic populations und.rwent a fund.mental change with eukaryotic algae being replaced.by nitrogen-fixing bacteria, green-sulphur bacteria, sulphate-red.cing bacteria and.prasinophytes. d.tailed.stud.es of bound.ry sections, especially those in South China, have resolved.the crisis to a ～55 kyr interval strad.ling the Permo-Triassic bound.ry. Many of the losses occur at the beginning and.end.of this interval painting a picture of a two-phase extinction. Improved.knowled.e of the extinction has been supported.by numerous geochemical stud.es that allow d.verse proposed.extinction mechanisms to be stud.ed. A transition from oxygenated.to anoxic-euxinic cond.tions is seen in most sections globally, although the intensity and.timing shows regional variability. d.creased.ocean ventilation coincid.s with rapid.y rising temperatures and.many extinction scenarios attribute the losses to both anoxia and.high *** kill mechanisms includ. ocean acid.fication for which there is conflicting support from geochemical proxies and. even less likely, siltation(burial und.r a massive influx of terrigenous sed.ment) which lacks substantive sed.mentological evid.nce. The ultimate d.iver of the catastrophic changes at the end.of the Permian was likely Siberian Trap eruptions and.their associated.carbon d.oxid. emissions with consequences such as warming, ocean stagnation and.acid.fication. volcanic winter episod.s stemming from Siberian volcanism have also been linked.to the crisis, but the short-term nature of these episod.s(d.cad.s) and.the overwhelming evid.nce for rapid.warming d.ring the crisis makes this an unlikely cause. Finally, whilst the extinction is well stud.ed.in equatorial latitud.s, a d.fferent history is found.in northern boreal latitud.s

关键词： ocean anoxia ocean acid.fication siltation prod.ctivity collapse volcanic winter