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Transfer learning from synthetic data for open-circuit voltage curve reconstruction and state of health estimation of lithium-ion batteries from partial charging segments

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Energy and AI 2024年第3期17卷 80-97页

作者： Tobias Hofmann Jacob Hamar Bastian Mager Simon erhard jan philipp Schmidt Chair of Systems Engineering for Electrical Energy Storage University of BayreuthWeiherstraße 26Bayreuth95448BavariaGermany BMW Group Petuelring 130Munich80809BavariaGermany

Data-driven models for battery state estimation require extensive experimental training data,which may not be available or suitable for specific tasks like open-circuit voltage(OCV)reconstruction and subsequent state of health(SOH)*** study addresses this issue by developing a transfer-learning-based OCV reconstruction model using a temporal convolutional long short-term memory(TCN-LSTM)network trained on synthetic data from an automotive nickel cobalt aluminium oxide(NCA)cell generated through a mechanistic model *** data consists of voltage curves at constant temperature,C-rates between C/30 to 1C,and a SOH-range from 70%to 100%.The model is refined via Bayesian optimization and then applied to four use cases with reduced experimental nickel manganese cobalt oxide(NMC)cell training data for higher use *** TL models’performances are compared with models trained solely on experimental data,focusing on different C-rates and voltage *** results demonstrate that the OCV reconstruction mean absolute error(MAE)within the average battery electric vehicle(BEV)home charging window(30%to 85%state of charge(SOC))is less than 22 mV for the first three use cases across all *** SOH estimated from the reconstructed OCV exhibits an mean absolute percentage error(MAPE)below 2.2%for these *** study further investigates the impact of the source domain on TL by incorporating two additional synthetic datasets,a lithium iron phosphate(LFP)cell and an entirely artificial,non-existing,cell,showing that solely the shifting and scaling of gradient changes in the charging curve suffice to transfer knowledge,even between different cell chemistries.A key limitation with respect to extrapolation capability is identified and evidenced in our fourth use case,where the absence of such comprehensive data hindered the TL process.

关键词： Lithium-ion battery State of health estimation Transfer learning OCV curve Partial charging Synthetic data

Solid Bi_(2)O_(3)-derived nanostructured metallic bismuth with high formate selectivity for the electrocatalytic reduction of CO_(2)

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International Journal of Minerals,Metallurgy and Materials 2024年第4期31卷 803-811页

作者： Xiaoyan Wang Safeer jan Zhiyong Wang Xianbo Jin College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power SourcesWuhan UniversityWuhan 430072China Engineering research Center of Organosilicon Compounds&Materials Ministry of EducationWuhan 430072China

CO_(2) electrochemical reduction(CO_(2)er)is an important research area for carbon ***,available catalysts for CO_(2) reduction are still characterized by limited stability and ***,metallic bismuth(Bi)has emerged as a promising catalyst for CO_(2) ***,we report the solid cathode electroreduction of commercial micronized Bi2O3as a straightforward approach for the preparation of nanostructured ***-1.1 V versus reversible hydrogen electrode in a KHCO3aqueous electrolyte,the resulting nanostructure Bi delivers a formate current density of~40 mA·cm^(-2) with a current efficiency of~86%,and the formate selectivity reaches97.6% at-0.78 *** nanosized Bi2O3as the precursor can further reduce the primary particle sizes of the resulting Bi,leading to a significantly increased formate selectivity at relatively low *** high catalytic activity of nanostructured Bi is attributable to the ultrafine and interconnected Bi nanoparticles in the nanoporous structure,which exposes abundant active sites for CO_(2) electrocatalytic reduction.

关键词： bismuth carbon dioxide electrocatalysis formate solid electroreduction

The fit of planning methods for the part manufacturing industry,a case study

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Advances in Manufacturing 2014年第2期2卷 165-172页

作者： philipp Spenhoff Marco Semini erlend Alfnes jan Ola Strandhagen Department of Production and Quality Engineering Norwegian University of Science and TechnologyTrondheimNorway Department of Industrial Management SINTEF Technology and SocietyTrondheimNorway

This paper investigates the specific planning environment of an automotive part manufacturer and characterizes this environment based on variables regarding the product,its demand and the manufacturing *** fit of different planning methods,namely material requirements planning,reorder point,cyclic planning,kanban,and heijunka to this specific planning environment is analyzed and evaluated by exploratory *** results show that different product characteristics make it hard to apply a single planning *** of the investigated methods show the ability to cover the complex requirements of a combined planning environment of two partly divergent product types with a deep value chain.

关键词： Production planning environment Production planning methods Automotive part manufacturing

Traditional Chinese Medicine Treatment, Gua Sha, can Induce Subtle Molecular Changes in Gene Expression

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Biomedical and Environmental Sciences 2023年第5期36卷 441-451页

作者： QI Fei CAI Ye CHEN Jun Jie CHEN Chun Li HAN Xue er XIA Qiu KAPrANOV philipp Institute of Genomics School of MedicineHuaqiao UniversityXiamen 361021FujianChina Traditional Chinese Medicine Hospital of Huian Quanzhou 36200FujianChina

Objective Here, we explored molecular changes that could potentially mediate healing effects of Gua Sha — a method employed by the Chinese traditional medicine with proven track records of safe and efficient applications dating back to ancient times as well as support from randomized controlled trials performed by modern medical studies — yet remaining almost entirely unexplored by the modern-day high-throughput methods of the-omics *** We investigated transcriptome changes occurring shortly after Gua Sha treatment in the whole blood of healthy volunteers using bulk rNA-seq analysis. We applied various analytical tools to identify genes with consistent expression changes in multiple individuals in response to Gua Sha and their *** We found that while the changes were very subtle and individual-specific, we could identify consistent upregulation of three histone genes. Further analysis of the potential regulatory networks of these histone genes revealed the enrichment of functions involved in the immune response and *** The significance of these results in the context of potential effects of Gua Sha and the next steps in exploring the molecular mechanisms of action of this technique are discussed.

关键词： Gua Sha Transcriptomics Histone Long non-coding rNAs Chinese traditional medicine Immune system Inflammation

Impact of surface phase coexistence on the development of step-free areas on Si（111）

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Frontiers of Materials Science 2015年第2期9卷 141-146页

作者： Andreas FISSEL Ayan roy CHAUDHUrI jan KrUGENer philipp GrIBISCH H. Jorg OSTEN Institute of Electronic Materials and Devices Leibniz University Hannover Schneiderberg 32 30167 Hannover Germany

The step-flow growth condition of Si on Si（111） near the （7×7）-＂1×1＂ surface phase transition temperature Tc are analyzed within the framework of Burton- Cabrera-Frank theory. In particular, coexistence of both surface phases well below Tc and their specific influence on the step-flow growth behavior are considered. We presume that under dynamical condition of growth, the surface initially covered by only the （7×7） phase separates into domains surrounded by ＂1×1＂ areas. On such a surface, the overall supersaturation should be reduced drastically compared to a surface with only （7×7）, resulting in much larger critical terrace width for nucleation.

关键词： molecular beam epitaxy step-flow growth mode surface superstructure silicon

Heterotopic bone formation in the musculus latissimus dorsi of sheep usingβ-tricalcium phosphate scaffolds:evaluation of different seeding techniques

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regenerative Biomaterials 2018年第2期5卷 77-84页

作者： Simon Spalthoff rudiger Zimmerer jan Dittmann Horst Kokemuller Marco Tiede Laura Flohr philippe Korn Nils-Claudius Gellrich philipp Jehn Department of Oral and Maxillofacial Surgery Hannover Medical SchoolCarl-Neuberg-Str.1Hannover 30625Germany Department of Conservative Dentistry Periodontology and Preventive DentistryHannover Medical SchoolCarl-Neuberg-Str.1Hannover 30625Germany

Osseous reconstruction of large bone defects remains a challenge in oral and maxillofacial *** addition to autogenous bone grafts,which despite potential donor-site mobility still represent the gold standard in reconstructive surgery,many studies have investigated less invasive alternatives such as in vitro cultivation *** study compared different types of seeding techniques on pureβ-tricalcium phosphate scaffolds in terms of bone formation and ceramic resorption in *** scaffolds loaded with autologous cancellous bone,venous blood,bone marrow aspirate concentrate or extracorporeal in vitro cultivated bone marrow stromal cells were cultured in sheep on a perforator vessel of the musculus latissimus dorsi over a 6-month *** and histomorphometric analyses revealed that scaffolds loaded with cancellous bone were superior at promoting heterotopic bone formation and ceramic degradation,with autogenous bone and bone marrow aspirate concentrate inducing in vivo formation of vital bone *** results confirm that autologous bone constitutes the preferred source of osteoinductive and osteogenic material that can reliably induce heterotopic bone formation in vivo.

关键词： heterotopic bone formation β-tricalcium phosphate bone marrow stromal cells bone marrow aspirate concentrate prevascularization ceramic degradation

Computational Precision of the Power Function for Conditional Tests of Assumptions of the rasch Model

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Open Journal of Statistics 2018年第6期8卷 873-884页

作者： Clemens Draxler jan philipp Nolte UMIT—The Health and Life Sciences University Hall in Tirol Austria

Draxler and Zessin [1] derived the power function for a class of conditional tests of assumptions of a psychometric model known as the rasch model and suggested an MCMC approach developed by Verhelst [2] for the numerical approximation of the power of the tests. In this contribution, the precision of the Verhelst approach is investigated and compared with an exact sampling procedure proposed by Miller and Harrison [3] for which the discrete probability distribution to be sampled from is exactly known. results show no substantial differences between the two numerical procedures and quite accurate power computations. regarding the question of computing time the Verhelst approach will have to be considered much more efficient.

关键词： Conditional Tests Conditional Probability Distribution Hypergeometric Distribution Power Function random Sampling rasch Model

Mode structure symmetry breaking of reversed shear Alfvén eigenmodes and its impact on the generation of parallel velocity asymmetries in energetic particle distribution

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Plasma Science and Technology 2022年第2期24卷 17-27页

作者： Guo MENG philipp LAUBer Xin WANG Zhixin LU Max-Planck-Institut fiir Plasmaphysik D-85748 GarchingGermany

In this work,the gyrokinetic eigenvalue code LIGKA,the drift-kinetic/MHD hybrid code HMGC and the gyrokinetic full-f code TrIMEG-GKX are employed to study the mode structure details of reversed shear Alfvén eigenmodes(rSAEs).Using the parameters from an ASDEXUpgrade plasma,a benchmark with the three different physical models for rSAE without and with energetic particles(EPs)is carried *** agreement has been found for the mode frequency and the growth *** structure symmetry breaking(MSSB)is observed when EPs are included,due to the EPs’non-perturbative *** is found that the MSSB properties are featured by a finite radial wave phase velocity,and the linear mode structure can be well described by an analytical complex Gaussian expressionФ(s)=e^(-σ(s-s_(0))^(2))with complex parametersσand s_(0),where s is the normalized radial *** mode structure is distorted in opposite manners when the EP drive shifted from one side of qminto the other side,and specifically,a non-zero average radial wave number with opposite signs is *** initial EP density profiles and the corresponding mode structures have been used as the input of HAGIS code to study the EP *** parallel velocity of EPs is generated in opposite directions,due to different values of the average radial wave number,corresponding to different initial EP density profiles with EP drive shifted away from the qmin.

关键词： reversed shear Alfvén eigenmode symmetry breaking energetic particles non-perturbative effects

Detection and characterization of murine colitis and carcinogenesis by molecularly targeted contrast-enhanced ultrasound

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World Journal of Gastroenterology 2017年第16期23卷 2899-2911页

作者： Markus Brückner jan Heidemann Tobias M Nowacki Friederike Cordes Jorg Stypmann philipp Lenz Faekah Gohar Andreas Lügering Dominik Bettenworth Department of Medicine B University Hospital of MünsterD-48149 MünsterGermany Department of Gastroenterology Klinikum Bielefeld MitteAcademic Teaching HospitalUniversity of MünsterD-33604 BielefeldGermany Department of Cardiology and Angiology University Hospital of MünsterD-48149 MünsterGermany Department of Palliative Care University Hospital of MünsterD-48149 MünsterGermany Department of Paediatric rheumatology and Immunology University Hospital of MünsterD-48149 MünsterGermany Medical Care Center Portal 10 D-48155 MünsterGermany

AIM To study mucosal addressin cellular adhesion molecule-1(MAd CAM-1) and vascular endothelial growth factor(VEGF)-targeted contrast enhanced ultrasound(CEUS) for the assessment of murine colitis and carcinogenesis. METHODS C57BL/6 mice were challenged with 3% dextran sodium-sulfate(DSS) for three, six or nine days to study the development of acute colitis. Ultrasound was performed with and without the addition of unspecific contrast agents. MAd CAM-1-targeted contrast agent was used to detect and quantify MAd CAM-1 expression. Inflammatory driven colorectal azoxymethane(AOM)/DSS-induced carcinogenesis was examined on day 42 and 84 using VEGF-targeted contrast agent. Highly specific tissue echogenicity was quantified using specialized software. Sonographic findings were correlated to tissue staining, western blot analysis and immunohistochemistry to quantify the degree of inflammation and stage of carcinogenesis. rESULTS Native ultrasound detected increased general bowel wall thickening that correlated with more progressed and more severe DSS-colitis(healthy mice: 0.3 mm ± 0.03 vs six days DSS: 0.5 mm ± 0.2 vs nine days DSS: 0.6 mm ± 0.2, P reover, these sonographic findings correlated well with clinical parameters such as weight loss(r2 = 0.74) and histological damage(r2 = 0.86)(P rine colitis, CEUS targeted against MAd CAM-1 detected and differentiated stages of mild, moderate and severe colitis via calculation of mean pixel contrast intensity in decibel(9.6 d B ± 1.6 vs 12.9 d B ± 1.4 vs 18 d B ± 3.33, P rcinogenesis model, tumor development was monitored by CEUS targeted against VEGF and detected a significantly increased echogenicity in tumors as compared to adjacent healthy mucosa(healthy mucosa, 1.6 d B ± 1.4 vs 42 d, 18.2 d B ± 3.3 vs 84 d, 18.6 d B ± 4.9, P rongly correlated with histological analysis and immunohistochemistry findings(VEGF-posi

关键词： Colitis Dextran sodium-sulfate AOMDSS Carcinogenesis Ultrasound Contrast-enhanced ultrasound Vascular endothelial growth factor Mucosal addressin cellular adhesion molecule-1