检索结果-南通市图书馆

作者： luis carlos Silva Rojas 上海交通大学

学位级别：硕士

The evaporation process has been studied widely in the past in order to understand the mechanisms and driving forces that induce the flow in multiphase *** knowledge is essential in industrial and real-life applications and systems such as oil recovery,soil remediation,water management in fuel cells,and *** this study,isothermal experiments at 21.5,46.7,and 74.1 ℃;and non-isothermal experiments with gradients of 10,20,and30 ℃ have been conducted in a 2D microfluidic pore network in order to observe the phase distribution,liquid-gas interface movement,liquid bridges,and capillary instability events induced by the dynamics of multi-phase *** find a relation between saturation and the flow rate during capillary instability *** show the formation and disappearance mechanisms of liquid bridges for all the non-isothermal and isothermal experiments at46.7,and 74.1 ℃.The effects of temperature in saturation,evaporation rate,capillary stability,specific interfacial area,and liquid bridges are also discussed in this *** temperature significantly impacts the evaporation rate,inducing different pathways when the gas phase recedes within the pore network and a shorter time duration for the overall evaporation *** instability is another phenomenon that affects the phase pattern and ***,it is not easy to observe and consider due to its duration(significantly shorter in comparison with the evaporation time)and unpredictability in the occurrence of a new ***,for the non-isothermal experiments,linear behavior is observed for the gradient between cold and hot temperatures.

关键词： porous media evaporation capillary instability liquid bridge thermal gradient specific interfacial area

Fast magnitude determination using a single seismological station record implementing machine learning techniques

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Geodesy and Geodynamics 2018年第1期9卷 34-41页

作者： luis H.Ochoa luis F.Nino carlos A.Vargas Universidad Nacional de Colombia Carrera 45 N°26-85 Edificio Manuel Ancizar-Of:330BogotaColombia

In this work a Support Vector Machine Regression（SVMR） algorithm is used to calculate local magnitude（MI） using only five seconds of signal after the P wave onset of one three component seismic station. This algorithm was trained with 863 records of historical earthquakes, where the input regression parameters were an exponential function of the waveform envelope estimated by least squares and the maximum value of the observed waveform for each component in a single station. Ten-fold cross validation was applied for a normalized polynomial kernel obtaining the mean absolute error for different exponents and complexity parameters. The local magnitude（MI） could be estimated with 0.19 units of mean absolute error. The proposed algorithm is easy to implement in hardware and may be used directly after the field seismological sensor to generate fast decisions at seismological control centers, increasing the possibility of having an effective reaction.

关键词： Earthquake early warning Support Vector Machine Regression Earthquake Rapid response Local magnitude Seismic event Seismology Bogota Colombia

A comparative assessment of empirical and lattice Boltzmann method-based drag models for simulation of gas-solid flow hydrodynamics in a bubbling fluidized bed

在线全文

学校读者我要写书评

暂无评论

Particuology 2017年第4期15卷 129-137页

作者： carlos M. Romero Luna luis R. Carrocci Gretta L.A.F. Arce Ivonete Avila UNESP - Sflo Paulo State University School of Engineering Department of Energy Laboratory of Combustion and Carbon Capture (LC3) CEP 12.516-410 Guaratinguetd SP Brazil INPE - Brazilian Space Research Institute Combustion and Propulsion Associated I.aboratory CEP 12.630-000 Cachoeira Paulista SP Brazil UNJFSC -Jose Faustino Sanchez Carrion National University Faculty of Chemical and Metallurgical Engineering Advanced Materials and Nanotechnology Research Group Huacho Lima Peru

In simulations of fluidized beds using computational fluid dynamics （CFD）, the description of gas-solid flow hydrodynamics relies on a drag model to account for the momentum transfer between gas and solid phases. Although several studies of drag models have been published, there have been few investigations of the application of lattice Boltzmann method （LBM）-based drag models to bubbling fluidized bed simu- lations. In the present study, a comprehensive comparison of empirical and LBM-based drag models was carried out to assess the performance of these models during simulations of gas-solid flow hydrodynam- ics in a bubbling fluidized bed. A CFD model using the MFIX code based on the Eulerian-Eulerian approach and the kinetic theory of granular flow was used to simulate a 2D bubbling fluidized bed with Geldart B particles. The simulation results were validated by comparison with experimental data. Statistical anal- ysis of the results shows that LBM-based drag models can reliably model gas-solid flow hydrodynamics in a bubbling fluidized bed.

关键词： CFD Drag model Gas-solid flow hydrodynamics Bubbling fluidized bed

Pressure drop analysis on the positive half-cell of a cerium redox flow battery using computational fluid dynamics: mathematical and modelling aspects of porous media

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2021年第2期15卷 399-409,F0004页

作者： Fernando F.Rivera Berenice Miranda-Alcantara German Orozco carlos Ponce de Leon luis F.Arenas National Council of Science and Technology(CONACYT) Mexico City 03940Mexico Center of Research and Technological Development in Electrochemistry(CIDETEQ) Queretaro 76703Mexico Electrochemical Engineering Laboratory Energy Technology Research GroupFaculty of Engineering and Physical SciencesUniversity of SouthamptonSouthampton SO171BJUK

Description of electrolyte fluid dynamics in the electrode compartments by mathematical models can be a powerful tool in the development of redox flow batteries(RFBs)and other electrochemical *** order to determine their predictive capability,turbulent Reynolds-averaged Navier-Stokes(RANS)and free flow plus porous media(Brinkman)models were applied to compute local fluid velocities taking place in a rectangular channel electrochemical flow cell used as the positive half-cell of a cerium-based RFB for laboratory *** different platinized titanium electrodes were considered,a plate plus a turbulence promoter and an expanded metal *** pressure drop was validated against experimental data obtained with typical cerium *** was found that the pressure drop values were better described by the RANS approach,whereas the validity of Brinkman equations was strongly dependent on porosity and permeability values of the porous media.

关键词： CFD simulation porous media porous electrode pressure drop redox flow battery

Changes in social emotion recognition following traumatic frontal lobe injury

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2012年第2期7卷 101-108页

作者： Ana Teresa Martins luis Faísca Francisco Esteves Cláudia Simo Mariline Gomes Justo Angélica Muresan Alexandra reis Department of Psychology University of Algarve Lisbon Universitary Institute

Changes in social and emotional behaviour have been consistently observed in patients with traumatic brain injury. These changes are associated with emotion recognition deficits which represent one of the major barriers to a successful familiar and social reintegration. In the present study, 32 patients with traumatic brain injury, involving the frontal lobe, and 41 age- and education-matched healthy controls were analyzed. A Go/No-Go task was designed, where each participant had to recognize faces representing three social emotions （arrogance, guilt and jealousy）. Results suggested that ability to recognize two social emotions （arrogance and jealousy） was significantly reduced in patients with traumatic brain injury, indicating frontal lesion can reduce emotion recognition ability. In addition, the analysis of the results for hemispheric lesion location （right, left or bilateral） suggested the bilateral lesion sub-group showed a lower accuracy on all social emotions.

关键词： traumatic brain injury facial emotion recognition social emotions

Combined penetrating keratoplasty, pars plana vitrectomy and Ahmed glaucoma valve implant after open globe injury： a challenging approach

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2017年第11期10卷 1786-1788页

作者： Joao Beato Antonio B.Melo Pedro A.Faria luis Torrao Fernando Falcao-reis Department of Ophthalmology Sao Joao Hospital CenterPorto 4200-319 Portugal Department of Sense Organs Faculty of Medicine University of Porto Porto 4200-319 Portugal

Dear Editor,I am ***？o Beato,from the Ophthalmology Department of Sao Jo？o Hospital Center,Porto,Portugal.I write to present a case of combined penetrating keratoplasty（PKP）with temporary Eckardt keratoprosthesis,

关键词： OCULAR TRAUMA OUTCOMES

Highly accessible aqueous synthesis of well-dispersed dendrimer type platinum nanoparticles and their catalytic applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2019年第5期12卷 1083-1092页

作者： Adrian Fernandez-Lodeiro Jamila Djafari David Lopez-Tejedor carlos Perez-Rizquez Benito Rodriguez-Gonzalez Jose luis Capelo Jose M.Palomo carlos Lodeiro Javier Fernandez-Lodeiro BIOSCOPE Group LAQV@REQUIMTEChemistry DepartmentFaculty of Science and TechnologyUniversity NOVA of LisbonCaparica CampusCaparica 2829-516Portugal PROTEOMASS Scientific Society Rua dos InventoresMadan ParqueCaparica CampusCaparica 2829-516Portugal Department of Biocatalysis Institute of Catalysis(CSIC)MadridSpainMarie Curie 2CantoblancoUAM CampusMadrid 28049Spain Scientific and Technological Research Assistance Center(CACTI) University of VigoLagoas-MarcosendeVigo 36310Spain

The application of novel methodologies to the synthesis of nanomaterials is still a challenge in many different technological and scientific *** efficient and reproducible synthetic methodologies,that produce fewer residues and reduce the cost of raw materials must be *** the present work,we have explored the attractive possibility to apply the cheap iron (Ⅱ) sulphate salt in the reduction process of the K2PtCl4 to produce colloids *** synthesis took places in water and was assisted by sodium citrate (SC) using polyvinylpyrrolidone (PVP) as a *** adjustment of this novelty process allows obtaining well-dispersed and sub-20 nm dendrimer-type platinum nanoparticles (Pt D-NPs).The nano-dendrimers produced have been characterized using dynamic light scattering (DLS),transmission electron microscopy (TEM),high-resolution TEM (HR-TEM),XRD spectroscopy,inductive couple plasma (ICP) analysis,Fourier transform infrared (FT-IR) and ultraviolet-visible (UV-vis) *** conformational results derived from the size and shape will be *** application of the Pt D-NPs has been explored in the reduction of p-nitrophenol (p-NP) to p-aminophenol (p-AP) in aqueous media at room temperature obtained TOF value of 253 min^-***,our Pt D-NPs were tested as artificial metalloenzyme showing catechol oxidase activity for oxidation of L-DOPA.

关键词： platinum dendrimer NPs catalytic application green synthesis cateohol oxidase-like activity

Catalytic feasibility of Ce-doped LaCoO_(3) systems for chlorobenzene oxidation:An analysis of synthesis method

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 Rare Earths 2022年第6期40卷 897-905,I0002页

作者： Héctor Acosta Pérez carlos A.López luis E.Cadús Fabiola N.Agüero Chemical Technology Research Institute(INTEQUI) UNSL-CONICETFaculty of Biochemical Chemistry and Pharmacy(UNSL)Almirante Brown 14555700San LuisArgentina

A family of Ce-doped LaCoO_(3) perovskites are presented as possible catalysts for Cl-VOCs *** materials with different contents of Ce were obtained through the citrate and the reactive grinding *** insertion of Ce in the original perovskite structure favours the presence of Co^(2+)/Co^(3+) and Ce^(3+)/Ce^(4+) redox pairs and a higher content of oxygen vacancies that enhances the catalytic performance in chlorobenzene combustion based on differential kinetics *** family obtained by the grinding method presents a performance as high as that synthesized by citrate ***,the reactive grinding is a feasible green chemistry alternative to obtain a catalyst with the same performance as that obtained from traditional ***,the stability of samples was evaluated under total combustion reaction conditions showing an excellent activity during 45 h time on stream.

关键词： Cl-VOCs Perovskites Chlorobenzene Cerium Cobalt Rare earths

Comparison of six human anti-transglutaminase ELISA-tests in the diagnosis of celiac disease in the Saharawi population

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2005年第24期11卷 3762-3766页

作者： Eloy Fernández Sabino Riestra luis Rodrigo carlos Blanco Antonio López-Vázquez Dolores Fuentes Maria Moreno carlos López-Larrea Biochemistry Service Gastroenterology Service Immunology Service

AIM: Celiac disease (CD) is an enteropathic disorder very prevalent in Saharawi people. Our aim was to investigate the diagnostic accuracy of six human tissue transglutaminase (tTG) based ELISA tests in Saharawi CD patients. METHODS: Fifty-two CD patients and 23 controls were selected from the Saharawi refugee camps in Tinduf. CD patients were divided into two groups according to their anti-endomysium (EmA) status: 41 EmA positive and 11 EmA negative. Sera from patients and controls were tested for human tTG using six commercial ELISA kits. We used receiver operating characteristics (ROC) curves and areas under the curve to compare the diagnostic accuracies of the six assays. RESULTS: In general, there are differences in the sensitivity and specificity of the human tTG ELISA assays used. Diagnostic accuracy of tests was significantly improved by adjusting the cut-off thresholds according to ROC plot analysis; the correction of the cut-off with the employment of the ROC curve analysis modifies the decision limit in more than 50% in five of the six kits evaluated. CONCLUSION: Some of the human tTG ELISAs used in this study have a diagnostic accuracy similar to EmA determination for diagnosis of CD in Saharawi people. However, it is necessary to select the assay with a higher sensitivity and specificity, and recalculate the cut-off threshold using samples from the referral population.

关键词： Anti-transglutaminase tests Comparative study Celiac diagnosis Saharawi population

TML:a language to specify aerial robotic missions for the framework Aerostack

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 Intelligent Computing and Cybernetics 2017年第4期10卷 491-512页

作者： Martin Molina Ramon A.Suarez-Fernandez carlos Sampedro Jose luis Sanchez-Lopez Pascual Campoy Department of Artificial Intelligence Technical University of Madrid(UPM)MadridSpain Centre for Automation and Robotics Technical University of MadridMadridSpain

Purpose–The purpose of this paper is to describe the specification language TML for adaptive mission plans that the authors designed and implemented for the open-source framework Aerostack for aerial ***/methodology/approach–The TML language combines a task-based hierarchical approach together with a more flexible representation,rule-based reactive planning,to facilitate *** approach includes additional notions that abstract programming *** authors built an interpreter integrated in the software framework *** interpreter was validated with flight experiments for multi-robot missions in dynamic ***–The experiments proved that the TML language is easy to use and expressive enough to formulate adaptive missions in dynamic *** experiments also showed that the TML interpreter is efficient to execute multi-robot aerial missions and reusable for different *** TML interpreter is able to verify the mission plan before its execution,which increases robustness and safety,avoiding the execution of certain plans that are not ***/value–One of the main contributions of this work is the availability of a reliable solution to specify aerial mission plans,integrated in an active open-source project with periodic *** the best knowledge of the authors,there are not solutions similar to this in other active open-source *** additional contributions,TML uses an original combination of representations for adaptive mission plans(*** trees with original abstract notions and rule-based reactive planning)together with the demonstration of its adequacy for aerial robotics.

关键词： Adaptive mission plans Aerial robotic systems Autonomous aerial systems Mission plan specification