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Predicting the coefficient of friction in a sliding contact by applying machine learning to acoustic emission data

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Friction 2024年第6期12卷 1299-1321页

作者： robert GUTIeRReZ Tianshi FANG robert MAINWARING Tom ReDDYHOFF Tribology Group Department of Mechanical EngineeringImperial College LondonExhibition RoadLondon SW72AZUK Shell Global Solutions(US)Inc.Shell Technology Center Houston 3333 Highway 6 SouthHoustonTX 77082USA Shell International Petroleum Company Limited Shell CentreYork RoadLondon SE17NAUK

It is increasingly important to monitor sliding interfaces within machines,since this is where both energy is lost,and failures *** emission(Ae)techniques offer a way to monitor contacts remotely without requiring transparent or electrically conductive ***,acoustic data from sliding contacts is notoriously complex and difficult to ***,we simultaneously measure coefficient of friction(with a conventional force transducer)and acoustic emission(with a piezoelectric sensor and high acquisition rate digitizer)produced by a steel‒steel rubbing *** data is then used to train machine learning(ML)algorithms(e.g.,Gaussian process regression(GPR)and support vector machine(SVM))to correlated acoustic emission with *** training requires the dense Ae data to first be reduced in size and a range of processing techniques are assessed for this(e.g.,down-sampling,averaging,fast Fourier transforms(FFTs),histograms).Next,fresh,unseen Ae data is given to the trained model and the resulting friction predictions are compared with the directly measured *** is excellent agreement between the measured and predicted friction when the GPR model is used on Ae histogram data,with root mean square(RMS)errors as low as 0.03 and Pearson correlation coefficients reaching ***,predictions remain accurate despite changes in test conditions such as normal load,reciprocating frequency,and stroke *** paves the way for remote,acoustic measurements of friction in inaccessible locations within machinery to increase mechanical efficiency and avoid costly failure/needless maintenance.

关键词： acoustic emission condition monitoring friction machine learning Gaussian process regression support vector machine

Generation and Propagation of an Urban Flash Flood and Our Collective Responsibilities

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Journal of earth Science 2022年第6期33卷 1624-1628页

作者： robert e.Criss eric M.Stein David L.Nelson Department of earth and Planetary Sciences Washington UniversitySt.LouisMO 63130USA 7427 Chamberlain Ave. University CitySt.LouisMO 63130USA 470 Columbia Circle PasadenaCA 91105USA

0 INTRODUCTION Destructive flash flooding is a growing global problem,with dangers being particularly acute in densely populated urban areas. The intensity of rainfall events is increasing, creating high runoff rates ... 详细信息

关键词： Flash flash Generation

Has Axial Spin Decline Affected earth's Geologic and Tectonic History?

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Journal of earth Science 2022年第5期33卷 1333-1336页

作者： Anne M.Hofmeister robert e.Criss Timothy M.Kusky Department of earth and Planetary Science Washington UniversitySt.LouisMO63130USA State Key Laboratory for Geological Processes and Mineral Resources Center for Global TectonicsSchool of Earth SciencesChina University of GeosciencesWuhan430074China Badong National Observatory and Research Station for Geohazards China University of GeosciencesWuhan430074China

0 INTRODUCTION Among the rocky planets,only earth remains active 4.5 Ga after ***,only earth has a chemically and structurally complex,bimodal surface with unequivocal horizontal *** unique plate motions are currently... 详细信息

关键词： earth formation mantle

SARS-COV-2 infection(coronavirus disease 2019)for the gastrointestinal consultant

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World Journal of Gastroenterology 2020年第14期26卷 1546-1553页

作者： Kaveh Hajifathalian Srihari Mahadev robert e Schwartz Shawn Shah Kartik Sampath Felice Schnoll-Sussman robert S Brown Jr David Carr-Locke David e Cohen Reem Z Sharaiha Division of Gastroenterology and Hepatology Weill Cornell MedicineNew York-Presbyterian HospitalNew YorkNY 10021United States

The current pandemic due to the severe acute respiratory syndrome coronavirus 2 has caused an extreme burden for health care systems globally,and the number of cases is expected to continue to increase,at least in the immediate *** virus is estimated to have infected more than 1.5 million *** available reports suggest that gastrointestinal(GI)involvement in coronavirus disease 2019(COVID-19)is common and in some cases the GI symptoms may precede the respiratory *** addition to direct effects of severe acute respiratory syndrome coronavirus 2,the infected patients remain at risk for the complications commonly managed by gastroenterology and hepatology *** most commonly reported GI manifestation of COVID-19 is diarrhea,which is reported in a third to up to more than half of the *** to moderate elevation of the liver enzymes are also common,although no case of acute liver failure has been reported so *** of the medications used for treatment of COVID-19 can also be associated with GI symptoms or liver injury and can be included in the differential diagnosis in these *** the diagnosis of the infection is currently based on RNA analysis in respiratory samples,the available literature on fecal shedding of this virus suggests that fecal RNA testing might prove to be a useful diagnostic *** is reasonable to delay all non-urgent endoscopic procedures during the peak of the pandemic and use additional protective equipment such as N95 respirators during endoscopy while most patients can be considered high risk for having been exposed to the virus.

关键词： SARS-CoV-2 COVID-19 Gastroenterology Hepatology Liver

Method for rapid on-site identification of VOCs

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Journal of environmental Sciences 2009年第7期21卷 1005-1008页

作者： Justin D Fair William F Bailey robert A Felty Amy e Gifford Benjamin Shultes Leslie H Volles Department of Chemistry University of Connecticut Storrs Connecticut 06269-3060 USA. INFICON Inc. 2 Technology Place East Syracuse New York 13057 USA

Rapid on-site identification of volatile organic compounds （VOCs） in ambient air is an important first step in remediation efforts. This study describes modification of a commercially available, portable GC/MS system and development of an analysis protocol for rapid （〈 3 min） sampling and identification of VOCs typically found at contaminated sites at the low ppbv level.

关键词： field analysis gas chromatograph mass spectrometer toxic industrial chemicals thermal desorption

The liberatory thought of Martin Luther King Jr.

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The liberatory thought of Martin Luther King Jr.

P-Lite: A study of parallel coordinate plot literacy

作者： (1952-)Birt robert e.

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Visual Informatics 2022年第3期6卷 81-99页

作者： elif e.Firat Alena Denisova Max L.Wilson robert S.Laramee School of Computer Science University of NottinghamUK Department of Computer Science University of YorkUK

Visualization literacy,the ability to interpret and comprehend visual designs,is recognized as an essential skill by the visualization *** identify and investigate barriers to comprehending parallel coordinates plots(PCPs),one of the advanced graphical representations for the display of multivariate and high-dimensional *** develop a parallel coordinates literacy test with diverse images generated using popular PCP software *** test improves PCP literacy and evaluates the user’s literacy *** introduce an interactive educational tool that assists the teaching and learning of parallel coordinates by offering a more active learning *** this pedagogical tool,we aim to advance novice users’parallel coordinates literacy *** on the hypothesis that an interactive tool that links traditional Cartesian Coordinates with PCPs interactively will enhance PCP literacy further than static slides,we compare the learning experience using traditional slides with our novel software tool and investigate the efficiency of the educational software with an online,crowdsourced ***-study results show that our pedagogical tool positively impacts a user’s PCP comprehension.

关键词： Human-centered computing Visualization systems and tool empirical studies in visualization

Use of Ligament Advanced Reinforcement System tube in stabilization of proximal humeral endoprostheses

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World Journal of Orthopedics 2016年第4期7卷 265-271页

作者： Nikolaos A Stavropoulos Hassan Sawan Firas Dandachli robert e Turcotte Department of Orthopedic Surgery McGill University Health Centre King Fahad Medical City

AIM:To review outcomes following usage of the Ligament Advanced Reinforcement System(LARS?)in shoulder ***:Medical records of nineteen patients(19 shoulders)that underwent tumor excisional procedure and reconstruction with the LARS synthetic fabric,were retrospectively ***:Patients’median age was 58 years old,while the median length of resection was 110 mm(range 60-210 mm).Compared to immediate post-operative radiographs,the prosthesis mean end-point position migrated superiorly at a mean follow up period of 26 mo(P=0.002).No statistical significant correlations between the prosthesis head size(P=0.87);the implant stem body length(P=0.949);and the length of resection(P=0.125)with the position of the head,were found at last follow *** cases of radiological dislocation were noted but only one was clinically symptomatic.A minor superficial wound dehiscence,healed without surgery,*** was no evidence of aseptic loosening either,and no prosthetic ***:LARS?use ensured stability of the shoulder following endoprosthetic reconstruction in most patients.

关键词： Proximal humeral endoprostheses Ligament Advanced Reinforcement System

Hepatic manifestations of non-steroidal inflammatory bowel disease therapy

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World Journal of Hepatology 2015年第27期7卷 2716-2728页

作者： robert Hirten Keith Sultan Ashby Thomas David e Bernstein Division of Gastroenterology North Shore University Hospital--Long Island Jewish Medical Center

Inflammatory bowel disease(IBD) is composed of Crohn's disease and ulcerative colitis and is manifested by both bowel-related and extraintestinal manifestations. Recently the number of therapeutic options available to treat IBD has dramatically increased, with each new medication having its own mechanism of action and side effect profile. A complete understanding of the hepatotoxicity of these medications is important in order to distinguish these complications from the hepatic manifestations of IBD. This review seeks to evaluate the hepatobiliary complications of non-steroid based IBD medications and aide providers in the recognition and management of these side-effects.

关键词： Hepatotoxicity Adverse drug reactions Drug induced