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

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

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壳牌对未来车用能源多元化发展趋势的思考

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汽车安全与节能学报 2020年第1期11卷 17-35页

作者：贾恬郑彬 Warnecke W Kolbeck A Aradi A Kofod M Clark R Wilbrand K 壳牌(上海)技术有限公司上海201210 shell global solutions(Germany)GmbH Hamburg 21107Germany shell global solutions us inc Houston 77082-3101USA shell global solutions(UK)Ltd London SE17NAUK

面对能源短缺和环境污染的双重挑战,交通领域的转型升级不可避免。本文结合未来车用动力系统的发展趋势,对交通运输领域中应用的多种先进动力系统、清洁能源及替代燃料进行综述和评价,包括目前主要使用的传统液态化石燃料即汽、柴油及... 详细信息

面对能源短缺和环境污染的双重挑战,交通领域的转型升级不可避免。本文结合未来车用动力系统的发展趋势,对交通运输领域中应用的多种先进动力系统、清洁能源及替代燃料进行综述和评价,包括目前主要使用的传统液态化石燃料即汽、柴油及先进内燃机技术,清洁替代燃料(如生物燃料、天然气合成油(GTL)燃料、电转液(PTL)燃料、液化天然气(LNG)等),以及电气化动力系统(包括混合动力、纯电动和燃料电池)等,并着重讨论液体燃料。壳牌认为没有一种单一的解决方案可以解决复杂的能源问题,未来交通能源结构将呈现多种能源并存的特点,并分别适用于不同的场景。该文还介绍了壳牌近期基于不同政治、经济和社会发展程度提出的3种远景(壳牌“高山”、“海洋”和“天空”远景),提出壳牌对未来车用能源领域转型脱碳发展情景的思考。

关键词：清洁替代燃料内燃机技术生物燃料天然气合成油(GTL) 电转液(PTL)燃料液化天然气(LNG) 电气化动力总成远景预测

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Vedolizumab use in patients with inflammatory bowel diseases undergoing surgery:clinical trials and post-marketing experience

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Gastroenterology Report 2019年第5期7卷 322-330,I0001页

作者： Bo Shen Aimee Blake Karen Lasch Michael Smyth Fatima Bhayat Center for Inflammatory Bowel Disease Digestive Disease and Surgery InstituteCleveland ClinicClevelandOHUSA global Patient Safety Evaluation Takeda Pharmaceuticals International Co.CambridgeMAUSA us Medical Office Takeda Pharmaceuticals USA Inc.DeerfieldILUSA global Medical Affairs Takeda Development Centre Europe LtdLondonUK Kyowa Kirin International plc ChertseyUK

Background:Patients with inflammatory bowel diseases frequently require surgery,but immunotherapies used in disease management may increase the risk of post-operative *** investigated frequencies of post-operative complications in patients who received vedolizumab—a gut-selective antibody approved for the treatment of moderately to severely active ulcerative colitis and Crohn’s disease—in clinical-trial and post-marketing ***:This post hoc analysis of safety data from GEMINI 1,GEMINI 2,and long-term safety studies included patients who had had colectomy or bowel surgery/*** from the post-marketing Vedolizumab global Safety Database were also analysed(data cutoff point:19 May 2016).Adverse events relating to post-operative complications were identified using Medical Dictionary for Regulatory Activities preferred ***:Of 58 total surgeries in patients included in GEMINI 1 and GEMINI 2,post-operative complications were reported for 3/51 vedolizumab-treated patients(5.9%)and 1/7 placebo-treated patients(14.3%).In the long-term safety study,157/2,243 patients(7%)had colectomy or bowel surgery/resection;of these 157 patients who underwent surgery,11(7%)experienced a post-operative *** time between last pre-operative vedolizumab dose and surgery was 23 days in GEMINI 1,20 days in GEMINI 2,and 39–40 days in the long-termsafety *** the post-marketing setting,based on data covering approximately 46,978 patient-years of vedolizumab exposure,post-operative complications were reported in 19 ***:In clinical trials,complications of colectomy and bowel surgery/resection appeared infrequent,with minimal difference between vedolizumab and *** frequency of post-operative complications in the post-marketing setting appears low.

关键词： inflammatory bowel disease colorectal surgery vedolizumab

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Metabolomic Profiling in Selaginella lepidophylla at Various Hydration States Provides New Insights into the Mechanistic Basis of Desiccation Tolerance

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Molecular Plant 2013年第2期6卷 369-385页

作者： Abou Yobi Bernard W.M. Wone Wenxin Xu Danny C. Alexander Lining Guo John A. Ryals Melvin J. Oliver John C. Cushman Department of Biochemistry and Molecular Biology University of Nevada Reno NV 89557-0330 USA Department of Biological Sciences University of Nevada Reno NV 89557-0314 USA Metabolon inc. 800 Capitola Drive Suite 1 Durham NC 27713 USA us Department of Agriculture-Agricultural Research Service Plant Genetic Research Unit University of Missouri Columbia MI 65211 USA

Selaginella lepidophylla is one of only a few species of spike mosses （Selaginellaceae） that have evolved des-iccation tolerance （DT） or the ability to ＇resurrect＇ from an air-dried state. In order to understand the metabolic basis of DT, S, lepidophylla was subjected to a five-stage, rehydration/dehydration cycle, then analyzed using non-biased, global metabolomics profiling technology based on GC/MS and UHLC/MS/MS2 platforms. A total of 251 metabolites including 167 named （66.5%） and 84 （33.4%） unnamed compounds were characterized. Only 42 （16.7%） and 74 （29.5%） of compounds showed significantly increased or decreased abundance, respectively, indicating that most compounds were produced con-stitutively, including highly abundant trehalose, sucrose, and glucose. Several glycolysis/gluconeogenesis and tricarboxylic acid （TCA） cycle intermediates showed increased abundance at 100% relative water content （RWC） and 50% RWC. Vanillate, a potent antioxidant, was also more abundant in the hydrated state. Many different sugar alcohols and sugar acids were more abundant in the hydrated state. These polyols likely decelerate the rate of water loss during the drying process as well as slow water absorption during rehydration, stabilize proteins, and scavenge reactive oxygen species （ROS）. In contrast, nitrogen-rich and y-glutamyl amino acids, citrulline, and nucleotide catabolism products （e.g. allantoin） were more abundant in the dry states, suggesting that these compounds might play important roles in nitrogen remobilization during rehydration or in ROS scavenging. UV-protective compounds such as 3-（3-hydroxyphenyl）propionate, apigenin, and naringenin, were more abundant in the dry states. Most lipids were produced constitutively, with the exception of choline phosphate, which was more abundant in dry states and likely plays a role in membrane hydration and stabilization. In contrast, several poly- unsaturated fatty acids were more abundant in the hydrated states, suggestin

关键词： abiotic/environmental stress mass spectrometry metabolomics oxidative/photooxidative stress desiccationtolerance Selaginella.

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Parallel phase 1 clinical trials in the us and in China:accelerating the test of avitinib in lung cancer as a novel inhibitor selectively targeting mutated EGFR and overcoming T790M-induced resistance

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Chinese Journal of Cancer 2015年第7期34卷 285-287页

作者： Xiao Xu ACEA Biosciences inc ACEA Pharmaceutical Research

Avitinib,a new generation inhibitor of epidermal growth factor receptor(EGFR),was approved for clinical trial in both China and the United States,and the phase 1 trials were initiated in both countries in *** the preclinical studies,avitinib showed three novel features including(1)irreversibly binding EGFR by forming a covalent bound with Cys797 in the ATP-binding pocket,(2) sparing wild-type EGFR,and(3)overcoming T790M-induced *** is the first China-developed novel EGFR inhibitor that has entered in global clinical trials,and will provide a precision targeted therapy for non-small cell lung cancer patients.

关键词：非小细胞肺癌 EGFR 临床试验诱导抗性抑制剂突变中国美国

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using real world data to assess cardiovascular outcomes of two antidiabetic treatment classes

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World Journal of Diabetes 2018年第12期9卷 252-257页

作者： Manfred Paul Stapff CMO TriNetX Inc.

AIM To evaluate the effect on cardiovascular outcomes of sodium-glucose co-transporter-2(SGLT2) inhibitors in a real world setting by analyzing electronic medical *** We used Tri Net X, a global federated research network providing statistics on electronic health records(EHR). The analytics subset contained EHR from approximately 38 Million patients in 35 Health Care Organizations in the United States. The records of 46,909 patients who had taken SGLT2 inhibitors were compared to 189,120 patients with dipeptidyl peptidase(DPP) 4 inhibitors. We identified five potential confounding factors and built respective strata: elderly, hypertension, chronic kidney disease(CKD), and co-medication with either insulin or metformin. Cardiovascular events were countedas stroke(ICD10 code: I63) or myocardial infarction(ICD10: I21) occurring within three years after the first instance of the respective medication in the patients' *** Of the 46909 patients with SGLT2 inhibitors in their EHR, 1667 patients(3.6%) had an ICD code for stroke or for myocardial infarction within the first three years after the first instance of the medication. In the control group, there were 10680 events of 189120 patients(5.6%), which represents a risk ratio of 0.63(95%CI: 0.60-0.66). The overall incidence of stroke or myocardial infarction in the strata with a potential confounding risk factor reached from 4.9% in patients taking metformin to 12.5% in the stratum with the highest risk(concomitant CKD). In all strata, the difference in risk of experiencing a cardiovascular event was similarly in favor of SGLT2 vs control, with Risk Ratio ranging from 0.62 to *** Real world data replicated the results from randomized clinical trials, confirmed the cardiovascular advantages of SGLT2 inhibitors, and showed its applicability to the us population.

关键词： Sodium-glucose co-transporter-2 inhibitors Cardiovascular events Clinical trials Electronic medical records Dipeptidyl peptidase 4 inhibitors Real world evidence Diabetes

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Integrated Behavioral Healthcare in Thailand:A Case Study from Chiang Mai

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Psychosomatic Medicine Research 2022年第1期4卷 19-27页

作者： Ronald O’Donnell Shiyou Wu Patraporn Bhatarasakoon Jennifer Rolfes Decha Tamdee Erik P Turtle Kasia Gilpatrick Kaoru Sato Breanna Reeser Mohamed Abdalla Rodger Kessler College of Health solutions Arizona State UniversityArizona StateU.S.A School of Social Work Arizona State UniversityArizona StateU.S.A Faculty of Nursing Chiang Mai UniversityChiang MaiThailand Cornerstone Whole Healthcare Organization Inc.U.S.A us Department of Justice U.S.A Metro Dermatology of NY&NJ U.S.A Integrated Health Initiatives Care1stU.S.A global Center for Applied Health Research Arizona State UniversityArizona StateU.S.A Department of Family Medicine School of MedicineUniversity of ColoradoColorado StateUSA

Purpose:This study aims to examine the level of behavioral health integration in primary care clinics among patients with hypertension and type 2 diabetes in Chiang Mai,*** also aims to explore the provider perceived prevalence of behavioral problems and need for an expert behavioral health consultant on the primary care team and the risk and protective factors of the patients’psychological and cardio-metabolic health ***:using survey data between 2017 and 2018 regarding the level of integration as measured by a Practice Integration Profile,provider ratings of prevalence and need based on a Provider Survey,and patient lifestyle and behavioral problems with a Health Risk Assessment in six primary health care settings in Chiang Mai,Thailand(n=335).We conducted ordinary least squares regressions to explore the relationship between each of the patient psychological and cardio-metabolic health outcomes and physical,mental health and substance abuse variables while controlling for the ***:The results showed overall high levels of integration,but significant variability across *** rated prevalence of health risk and need for a Behavioral Health Consultant as *** of the patient health risk assessment were variable,with some problems high severity,others ***:The results reflect a need for integrated behavioral health into the health care system in Thailand especially for those who are in the chronic illness *** for future study include an evaluation of the translation quality and validity and reliability of the study measures under the Thai *** study fills the research gap of lacking research on the level of integrated care in clinics in Thailand.

关键词： Integrated Behavioral Health Integrated healthcare Noncommunicable diseases Hypertension Diabetes Patient health risk

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The global Boundary Stratotype Section and Point for the base of the Danian Stage （Paleocene, Paleogene,＂Tertiary＂, Cenozoic） at El Kef, Tunisia—Original definition and revision

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Episodes 2006年第4期29卷 263-273页

作者： Eustoquio Molina Laia Alegret Ignacio Arenillas José A. Arz Njoud Gallala Jan Hardenbol Katharina von Salis Etienne Steurbau Noeel Vandenberghe Dalila Zaghbib-Turki Departamento de Ciencias de la Tierra Universidad de Zaragoza. E-50009 Zaragoza Spain. Département de Geologie Faculté des Sciences de Tunis 2092 Tunis El Manar Tunisia. global Sequense Chronostratigraphy Inc. 826 Plainwood Drive Houston Texas 77079-4227 USA. Via Maistra 9 CH-7513 Silvaplana Switzerland. Royal Belgian Institute of Natural Sciences Vautierstraat 29 B-1000 Brussels Belgium. Departement Geografie-Geologle Afdeling Geologie B-3000 Leuven Belgium.

The Cretaceous/Paleogene （K/Pg） Working Group, after many years of studies, voted to define the global Stratotype Section and Point （GSSP） for the base of the Danian Stage at the base of the boundary clay at a section near El Kef Tunisia. The GSSP was approved by the International Commission on Stratigraphy （ICS） and ratified by the International Union of Geological Sciences （IUGS） in 1991. Nevertheless, the GSSP was not officially published, although some papers dealing with geological aspects of the K/Pg boundary at El Kef have been published and this is quite well known. In April 2006, the GSSP was revisited, a marker was put in place and protection of the site was requested. Many correlation criteria are present at the GSSP of which the most useful are the meteorite impact evidence （iridium anomaly, Ni-rich spinel, etc.） and the mass extinction of planktic micro- and nannofossils. This event coincides with the GSSP, allowing us to propose that the K/Pg boundary is marked exactly by the moment of the meteorite impact, which implies that all the sediments generated by the impact belong to the Danian. This definition solves problems of correlation in the Yucatan peninsula （Mexico） and its surroundings.

关键词：全球层型解剖面和点古新世第三纪新生界地质环境

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Center of Milky Way Galaxy

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Journal of High Energy Physics, Gravitation and Cosmology 2022年第3期8卷 657-676页

作者： Vladimir S. Netchitailo Biolase inc. Irvine USA

In 2013, World-Universe Model (WUM) made one of the most important predictions: “Macroobjects of the World have cores made up of the discussed DM (Dark Matter) particles. Other particles, including DM and baryonic matter, form shells surrounding the cores” [1]. Prof. R. Genzel and A. Ghez confirmed this prediction: “The Discovery of a Supermassive Compact Object at the Centre of Our Galaxy” (Nobel Prize in Physics 2020). On May 12, 2022, astronomers, using the Event Horizon Telescope, released the first image of the accretion disk around the Sagittarius A* (Sgr A*) produced using a worldwide network of radio observatories made in April 2017. These observations were obtained by a global array of millimeter wavelength telescopes and analyzed by an international research team that now numbers over 300 people, which claimed that Sgr A* is a Supermassive Black Hole (SBH). In the present paper, we analyze these results in frames of WUM. Based on the totality of all accumulated experimental results for the Center of the Milky Way Galaxy we conclude that Sgr A* is the DM Core of our Galaxy.

关键词： World-Universe Model Center of Milky Way Galaxy Supermassive Compact Object Event Horizon Telescope Sagittarius A* Multi-Component Dark Matter Macroobjects shell Model Angular Momentum Problem

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Penalty Algorithms in Hilbert Spaces

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Acta Mathematica Sinica,English Series 2007年第2期23卷 229-236页

作者： Jean Pierre DusSAULT Hai SHEN André BANDRAUK Département d'Informatique Faculté des Sciences.Université de Sherbrooke Viador inc Laboratoire de Chimie Théorique Faculté des Sciences Université de Sherbrooke

We analyze the classical penalty algorithm for nonlinear programming in Hilbert spaces and obtain global convergence results, as well as asymptotic superlinear convergence order. These convergence results generalize similar results obtained for finite-dimensional problems. Moreover, the nature of the algorithms allows us to solve the unconstrained subproblems in finite-dimensional spaces.

关键词： penalty methods infinite dimensional optimization

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