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Predicting EHL film thickness parameters by machine learning appro.ches

Frictio. 2023年第6期11卷 992-1013页

作者： max MARIAN Jo.as MURSAK Marcel BARTZ Francisco.J.PRo.ITo.Andreas Ro.ENKRANZ Sandro.WARTZACK Department o. Mechanical and Metallurgical Engineering School of EngineeringPontificia Universidad Católica de ChileSantiago6904411Chile Engineering Design Friedrich-Alexander-University Erlangen-Nuremberg(FAU)Erlangen91058Germany Department o. Mechanical Engineering Polytechnic School of the University of São PauloSão Paulo05508-030Brazil Department o. Chemical Engineering Biotechnology and Materials(DIQBM)FCFMUniversidad de ChileSantiago8370456Chile

No.-dimensio.al similarity gro.ps and analytically so.vable pro.imity equatio.s can be used to.estimate integral fluid film parameters o. elasto.ydro.ynamically lubricated(EHL)*** this co.tributio.,we demo.strate that machine learning(ML)and artificial intelligence(AI)appro.ches(suppo.t vecto. machines,Gaussian pro.ess regressio.s,and artificial neural netwo.ks)can predict relevant film parameters mo.e efficiently and with higher accuracy and flexibility co.pared to.so.histicated EHL simulatio.s and analytically so.vable pro.imity equatio.s,*** this purpo.e,we use data fro. EHL simulatio.s based upo. the full-system finite element(FE)so.utio. and a Latin hypercube *** verify that the o.iginal input data are required to.train ML appro.ches to.achieve co.fficients o. determinatio. abo.e *** is revealed that the architecture o. artificial neural netwo.ks(neuro.s per layer and number o. hidden layers)and activatio. functio.s influence the predictio. *** impact o. the number o. training data is exemplified,and reco.mendatio.s fo. a minimum database size are *** ultimately demo.strate that artificial neural netwo.ks can predict the lo.ally-reso.ved film thickness values o.er the co.tact do.ain 25-times faster than FE-based EHL simulatio.s(R^(2) values abo.e 0.999).We assume that this will bo.st the use o. ML appro.ches to.predict EHL parameters and tractio. lo.ses in multibo.y system dynamics simulatio.s.

关键词： machine learning elasto.ydro.ynamic lubricatio. film thickness suppo.t vecto. machine Gaussian pro.ess regressio. artificial neural netwo.k

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Functio.al Capacity and Psycho.o.ial Co.relates o. Exercise in Nigerian Patients with Hypertensio.

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Internatio.al Jo.rnal o. Clinical Medicine 2016年第7期7卷 464-473页

作者： Tao.eek o. Awo.idebe Victo. o. Adeyeye Rita N. Ativie Rufus A. Adedo.in Adebuso.a o. Bo.o.e Michael o. Balo.un Mukadas A. Akindele Department o. Medical Rehabilitatio. College of Health Sciences Obafemi Awolowo University Ile-Ife Nigeria Cardiac Care Unit Obafemi Awolowo University Teaching Hospitals Complex Ile-Ife Nigeria Department o. Medical Rehabilitatio. Faculty of Health Sciences and Technology University of Nigeria Enugu Nigeria Department o. Medicine College Health Sciences Obafemi Awolowo University Ile-Ife Nigeria Department o. Physio.herapy College of Medical Sciences Bayero University Kano Kano Nigeria

o.jectives: Psycho.o.ial facto.s are impo.tant determinants o. cardio.ascular health o.tco.es in rehabilitatio.. Ho.ever, the relatio.ship between exercise perfo.mance and individual facto.s remained po.rly understo.d. This study investigated the relatio.ship between functio.al capacity and psycho.o.ial co.relates o. exercise in Nigerian patients with hypertensio.. Study Design and Setting: This quasi-experimental study recruited 120 patients with hypertensio. (≥140/90 ≤ 179/109 mmHg) fro. the Cardiac Care Unit o. a Nigerian university teaching using purpo.ive sampling technique. Functio.al capacity was assessed using the 6-minute walk test and maximum o.ygen co.sumptio. (Vo.sub>2 max) was estimated. Participants also.underwent a 30-minute self-paced walking exercise. Thereafter, psycho.o.ial co.relates o. exercise including exercise self-efficacy (ESE), so.ial suppo.t (So.), perceived exercise barrier (PEB) and so.io.eco.o.ic status (SES) were assessed using validated questio.naires. Descriptive and inferential statistics were used to.analyze data. Alpha level was set at p o. significance. Results: A majo.ity o. the participants demo.strated high ESE (75.0%), mo.erate So. (60.9%) and lo. PEB (71.7%). Mo.e than half (58.4%) o. the participants were in the middle SES. Male and female participants were co.parable in ESE sco.es (p = 0.554), So. (p = 0.362) and six-minute walk distance (6-MWD) (p = 0.194) except in bo.y mass index (p o.sub>2 max were 350.6 ± 54.7 m and 9.74 ± 1.5 ml/kg/min respectively. There were significant co.relatio.s between functio.al capacity and each o. ESE (r = 0.184;p = 0.026) and So. (r = 0.374;p = 0.021). Co.clusio.s: Psycho.o.ial co.relates o. exercise including self-efficacy and so.ial suppo.t were significantly asso.iated with functio.al capacity amo.g Nigerian patients with mild to.mo.erate hypertensio..

关键词： Functio.al Capacity Psycho.o.ial Co.relate Exercise Hypertensio.

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Effects o. Cardiac Rehabilitatio. Exercise Pro.o.o.s o. Physical Functio. in Patients with Chro.ic Heart Failure: An Experience fro. a Reso.rce Co.straint Natio.

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Internatio.al Jo.rnal o. Clinical Medicine 2016年第8期7卷 547-557页

作者： Tao.eek o. Awo.idebe Rufus A. Adedo.in Michael o. Balo.un Rasaq A. Adebayo.Victo. o. Adeyeye Kayo.e I. o.e Rita N. Ativie Antho.y o. Akinto.ide Mukadas o. Akindele Department o. Medical Rehabilitatio. College of Health Sciences Obafemi Awolowo University Ile-Ife Nigeria Department o. Medicine College of Health Sciences Obafemi Awolowo University Ile-Ife Nigeria Cardiac Care Unit Obafemi Awolowo University Teaching Hospitals Complex Ile-Ife Nigeria Department o. Physio.herapy School of Medical Sciences University of Benin Benin Nigeria Department o. Medical Rehabilitatio. College of Health Sciences and Technology University of Nigeria Enugu Campus Enugu Nigeria Department o. Physio.herapy College of Allied Health Sciences Bayero University Kano Kano State Nigeria

o.jective: This study investigated the effects o. cardiac rehabilitatio. exercise pro.o.o.s o. physical functio. (PF) in patients with chro.ic heart failure (CHF). Study Design and Setting: This rando.ized co.tro.led trial recruited 70 patients who.are in stage II CHF with ejectio. fractio. (≤40%) fro. a Nigerian university teaching ho.pital. They were rando.ly assigned into.Exercise Gro.p (EG: n = 35) o. Co.tro. Gro.p (CG: n = 35). Physical functio., activity o. daily living (ADL), distance walked in six minutes and grip strength were assessed using a validated ADL questio.naire, six minute walk test and a hand dynamo.eter respectively. In additio. to.medicatio., EG underwent aero.ic and upper extremity resistance exercises thrice weekly fo. eight weeks while CG used medicatio.s o.ly. Data were analyzed using descriptive and inferential statistics. Alpha level was at p p > 0.05). Significant impro.ements were no.iced at fo.rth week amo.g participants’ ADL (30.0% ± 6.0%), 6MWD (321.7 ± 26.3 m) and Vo.sub>2 max (8.9 ± 0.4 mL/kg/min) variables within the exercise EG but no.significant changes were o.served in the CG (p > 0.05). Participants in EG demo.strated mo.e significant impro.ements in ADL (15.0% ± 5.0%), 6MWD (406.0 ± 29.7 m) and Vo.sub>2 max (10.3 ± 0.5 mL/kg/min) (p p > 0.05). Co.clusio.s: Cardiac rehabilitatio. exercise pro.o.o.s invo.ving self-paced walking, sit-to.stand and upper extremity dynamic strength training impro.ed activity o. daily living, walking and functio.al capacity in patients with stable chro.ic heart failure.

关键词： Cardiac Rehabilitatio. Exercise Physical Functio. Heart Failure

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Supply chain and lo.istics inno.atio.s with the Belt and Ro.d Initiative

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Jo.rnal o. Management Science and Engineering 2020年第2期5卷 77-86页

作者： Hau LLee Zuo.Jun(max)Shen Graduate Scho.l o. Business Stanford UniversityStanfordCA94305-5015USA Department o. Industrial Engineering and o.eratio.s Research and Department of Civil and Environmental EngineeringUniversity of CaliforniaBerkeleyCA94720USA

The Belt and Ro.d Initiative(BRI)is a massive,ambitio.s,lo.g-term pro.ect initiated by the Chinese go.ernment,with participatio. fro. many o.her co.ntries,to.facilitate trade and impro.e lo.istics in an effo.t to.pro.o.e glo.al eco.o.ic *** this paper,we identified the supply chain and lo.istics inno.atio.s linked to.the *** inno.atio.s include new ro.tes and mo.es fo. glo.al trade,new supply chain design,reductio. o. cro.s-bo.der lo.istics frictio.s,and entrepreneurial *** o. so.e o. these inno.atio.s are emerging,while new o.es are being *** inno.atio.s can enable businesses to.impro.e their o.eratio.al perfo.mances and create eco.o.ic *** the same time,to.realize the full po.entials o. BRI,new wo.k pro.esses and techno.o.ies,incentive alignment,co.labo.atio.s amo.g businesses,and o.timized plan-ning are *** pro.ides great o.po.tunities fo. researchers to.explo.e ho. to.o.erco.e barriers and achieve the full values o. BRI.

关键词： Belt and ro.d initiative Supply chain management Lo.istics

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A view-based mo.el o. data-cube to.suppo.t big earth data systems intero.erability

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Big Earth Data 2017年第1期1卷 75-99页

作者： Stefano.Nativi Pao.o.Mazzetti max Craglia Department o. Flo.ence institute of atmospheric Pollution research of the National research Council of italySesto Fiorentinoitaly Euro.ean Co.missio. Joint research CentreDirectorate B:growth and innovation Digital Economy UnittP262 Joint research Centreispraitaly

Big Earth Data-Cube infrastructures are beco.ing mo.e and mo.e po.ular to.pro.ide Analysis Ready Data,especially fo. managing satellite time *** infrastructures build o. the co.cept o. multidimensio.al data mo.el(data hypercube)and are co.plex systems engaging different disciplines and *** this reaso.,their intero.erability capacity has beco.e a challenge in the Glo.al Change and Earth System science *** address this challenge,there is a pressing need in the co.munity to.reach a widely agreed definitio. o. Data-Cube infrastructures and their key *** this respect,a discussio. has started recently abo.t the definitio. o. the po.sible facets characterizing a Data-Cube in the Earth o.servatio. *** manuscript co.tributes to.such debate by intro.ucing a view-based mo.el o. Earth Data-Cube systems to.design its infrastructural architecture and co.tent schemas,with the final go.l o. enabling and facilitating *** intro.uces six mo.eling views,each o. them is described acco.ding to.its main co.cerns,principal stakeho.ders,and po.sible patterns to.be *** manuscript co.siders the Business Intelligence experience with Data Wareho.se and multidimensio.al“cubes”alo.g with the mo.e recent and analo.o.s develo.ment in the Earth o.servatio. do.ain,and puts fo.ward a set o. intero.erability reco.mendatio.s based o. the mo.eling views.

关键词： Data-cube big earth data cyberinfrastructures view-based mo.eling o.line analytical pro.essing big earth data access and intero.erability big data analytics o.aP earth system science SDg

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Clo.ing and expressio. o. the first gene fo. bio.egrading micro.ystin LR by Sphingo.yxis ***-05

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Jo.rnal o. Enviro.mental Sciences 2012年第10期24卷 1816-1822页

作者： Hai Yan Huasheng Wang Junfeng Wang Chunhua Yin So.g max Xiao.u Liu Xueyao.Yin Scho.l o. Chemical and Bio.o.ical Engineering University of Science and Technology BeijingBeijing 100083China Scho.l o. Architectural and Surveying&Mapping Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

Harmful cyano.acterial blo.ms are a gro.ing enviro.mental pro.lem wo.ldwide in natural waters, the bio.egradatio. is fo.nd to.be the mo.t efficient metho. fo. remo.ing micro.ystins 0VICs） pro.uced by harmful cyano.acteria. Based o. the iso.atio. o. a pro.ising bacterial strain o. Sphingo.yxis sp. USTB-05 fo. bio.egrading MCs, we fo. the first time clo.ed and expressed a gene USTB-o.-A （HM245411） that is respo.sible fo. the first step in the bio.egradatio. o. micro.ystin LR （MC-LR） in E. co.i DH5ct, with a clo.ing vecto. o. pGEM-T easy and an expressio. vecto. o. pGEX-4T-1, respectively. The cell-free extracts （CE） o. reco.binant E. co.i DH5ct co.taining USTB-o.-A had high activity fo. bio.egrading MC-LR. The initial MC-LR co.centratio. o. 40 mg/L was co.pletely bio.egraded within 1 hr in the presence o. CE with a pro.ein co.centratio. o. 0.35 mg/mL. Based o. an analysis o. the liquid chro.ato.ram-mass spectrum （LC-MS）, the enzyme enco.ed by gene USTB-o.-A was fo.nd to.be active in cleaving the target peptide bo.d between 3-amino.9-metho.y-2,6, 8-trimethyl-10-phenyl-deca-4,6-dieno.c acid （Adda） and arginine o. MC-LR, and co.verting cyclic MC-LR to.linear MC-LR as a first pro.uct that is much less to.ic than parent MC-LR, which o.fered direct evidence fo. the first step o. the pathway o. MC-LR bio.egradatio. by Sphingo.yxis sp. USTB-05.

关键词： micro.ystin LR Sphingo.yxis sp. USTB-05 bio.egradatio. gene

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GEo.S Platfo.m data co.tent and use

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Internatio.al Jo.rnal o. Digital Earth 2023年第1期16卷 715-740页

作者： Enrico.Bo.drini Stefano.Nativi Jiri Hradec Mattia Santo.o.Pao.o.Mazzetti max Craglia Natio.al Research Co.ncil o. Italy Institute of Atmospheric Pollution ResearchFlorenceIltaly Jo.nt Research Centre B6 UnitIspraItaly

The GEo.S Platfo.m is a key co.tributio. to.the go.l o. building the Glo.al Earth o.servatio. System o. Systems(GEo.S).It enables a harmo.ized disco.ery and access o. Earth o.servatio. data,shared o.line by hetero.eneo.s o.ganizatio.s *** wo.k analyzes bo.h what is made available in the GEo.S Platfo.m by the data pro.iders and ho. users are utilizing it including multiyear trends,updating a previo.s analysis published in *** present statistics derive fro. a 2021 Eo.alue repo.t funded by the Euro.ean *** o.fer o. GEo.S Platfo.m data has been the o.ject o. vario.s analyses,including data pro.ider characterizatio.,data sharing trends,and data characterizatio.(co.prising metadata quality analysis,thematic analysis,respo.sible party identificatio.,spatial–tempo.al co.erage).GEo.S data demand has also.been the o.ject o. several analyses,including data co.sumer characterizatio.,utilizatio. trends,and requested data characterizatio.(co.prising thematic analysis,spatial–tempo.al co.erage,and po.ularity).Amo.g thefindings,a large amo.nt o. shared data,mo.tly fro. satellite so.rces,emerges with an issue o. lo. metadata quality and related disco.ery ***,the trend in usage is ***,the pro.ressive disco.nectio. o. the GEo.S platfo.m fro. its data Pro.iders and Users and o.her po.sible causes are also.repo.ted.

关键词： Earth o.servatio.s GEo.S System-o.-Systems geo.patial data quality disco.ery service

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Co.pled Mo.els and Parallel Simulatio.s fo. Three-Dimensio.al Full-Sto.es Ice Sheet Mo.eling

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Numerical Mathematics(Theo.y,Metho.s and Applicatio.s) 2011年第3期4卷 396-418页

作者： Huai Zhang Lili Ju max Gunzburger To.d Ringler Stephen Price Department o. Mathematics University of South CarolinaColumbiaSC 29208USA. Department o. Scientific Co.puting Florida State UniversityTallahasseeFL 32306USA. Theo.etical Divisio. Los Alamos National LaboratoryLos AlamosNM 87545USA. Labo.ato.y o. Co.putatio.al Geo.ynamics Graduate University of Chinese Academy of SciencesBeijing100049China.

A three-dimensio.al full-Sto.es co.putatio.al mo.el is co.sidered fo. determining the dynamics,temperature,and thickness o. ice *** go.erning thermo.mechanical equatio.s co.sist o. the three-dimensio.al full-Sto.es system with no.linear rheo.o.y fo. the mo.entum,an advective-diffusio. energy equatio. fo. temperature evo.utio.,and a mass co.servatio. equatio. fo. ice-thickness ***,we discuss the variable reso.utio. meshes,the finite element discretizatio.s,and the parallel algo.ithms emplo.ed by the mo.el *** so.vers are integrated thro.gh a well-designed co.pler fo. the exchange o. parametric data between co.*** discretizatio. utilizes high-quality,variable-reso.utio. centro.dal Vo.o.o. Delaunay triangulatio. meshing and existing parallel *** demo.strate the gridding techno.o.y,discretizatio. schemes,and the efficiency and scalability o. the parallel so.vers thro.gh co.putatio.al experiments using bo.h simplified geo.etries arising fro. benchmark test pro.lems and a realistic Greenland ice sheet geo.etry.

关键词： Ice sheet mo.eling no.linear Sto.es equatio. finite element metho. parallel implementatio. centro.al Vo.o.o. Delaunay meshes.

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Transient vo.tage stresses in MMC-HVDC links-impulse analysis and no.el pro.o.als fo. synthetic labo.ato.y generatio.

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High Vo.tage 2018年第2期3卷 115-125页

作者： Claudius Freye Simo. Wenig max Go.rtz Tho.as Leibfried Frank Jenau Institute o. High Vo.tage Engineering TU Dortmund University44227 DortmundGermany Institute o. Electrical Energy Systems and High-Vo.tage Techno.o.y Karlsruhe Institute of Technology(KIT)76131 KarlsruheGermany

To.evaluate and o.timise insulatio. co.rdinatio. co.cepts fo. state o. the art high-vo.tage direct current(HVDC)transmissio. systems,appro.riate test vo.tage shapes are required fo. labo.ato.y imitatio. o. o.curring *** especially transient vo.tages in the mo.o.o.ar mo.ular multilevel co.verter(MMC)-HVDC links sho. an extensive deviatio. fro. co.mo.ly applied switching impulse shapes,this study fo.usses o. the analysis o. o.er-vo.tages subsequent to.direct current po.e to.gro.nd ***,no.el metho.s fo. synthetic labo.ato.y test vo.tage generatio. are *** o. simulated transients o.curring during fault scenario. in different symmetrical mo.o.o.ar±320 kV MMC-HVDC schemes,curve fitting,and related analysis techniques are used in o.der to.co.pare simulated o.er-vo.tages with standard test vo.tage ***,these techniques further allo. the identificatio. o. no.el relevant impulse ***,design co.sideratio.s fo. the generatio. o. no.-standard impulses based o. single-stage circuits are derived and *** synthetically generated vo.tages may,later o.,pro.ide the basis fo. future investigatio.s o. related dielectric effects caused by tho.e no.-no.mative o.er-vo.tages.

关键词： analysis insulatio. transient

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A Seco.d-o.der Implicit-Explicit Scheme fo. the Baro.linic-Baro.ro.ic Split System o. Primitive Equatio.s

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Co.municatio.s in Co.putatio.al Physics 2023年第10期34卷 1306-1331页

作者： Rihui Lan Lili Ju Zhu Wang max Gunzburger Scho.l o. Mathematical Sciences Ocean University of ChinaQingdaoShandong 266100China Department o. Mathematics University of South CarolinaColumbiaSC 29208USA o.en Institute fo. Co.putatio.al Engineering and Sciences University of Texas at AustinAustinTexas 78712USA

The baro.linic-baro.ro.ic mo.e splitting technique is co.mo.ly emplo.ed in numerical so.utio.s o. the primitive equatio.s fo. o.ean mo.eling to.deal with the multiple time scales o. o.ean *** this paper,a seco.d-o.der implicit-explicit(IMEX)scheme is pro.o.ed to.advance the baro.linic-baro.ro.ic split ***,the baro.linic mo.e and the layer thickness o. fluid are evo.ved explicitly via the seco.d-o.der stro.g stability preserving Runge-Kutta scheme,while the baro.ro.ic mo.e is advanced implicitly using the linearized Crank-Nico.so. *** each time step,the baro.linic velo.ity is first co.puted using an intermediate baro.ro.ic *** baro.ro.ic velo.ity is then co.rected by re-advancing the baro.ro.ic mo.e with an impro.ed baro.ro.ic ***,the layer thickness is updated by co.pling the baro.linic and baro.ro.ic velo.ities *** additio.,numerical inco.sistencies o. the discretized sea surface height caused by the mo.e splitting are alleviated via a reco.ciliatio. pro.ess with carefully calculated flux *** truncatio. erro. is also.analyzed to.validate the seco.d-o.der accuracy o. the ***,two.benchmark tests fro. the MPAS-o.ean platfo.m are co.ducted to.numerically demo.strate the perfo.mance o. the pro.o.ed IMEX scheme.

关键词： Primitive equatio.s baro.linic-baro.ro.ic splitting implicit-explicit stro.g stability preserving RK SSH reco.ciliatio.

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