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Data-driven diagnosis of high temperature PEM fuel cells based on the electrochemical impedance spectroscopy: Robustness improvement and evaluation

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journal of Energy Chemistry 2024年第9期96卷 544-558页

作者： Dan Yu Xingjun Li samuel Simon Araya Simon Lennart Sahlin Vincenzo Liso Department of Energy Aalborg UniversityAalborg 9220Denmark Walker Department of Mechanical Engineering The University of Texas at AustinAustinTX 78712USA Materials Research and Technology Development Luxembourg Institute of Science and Technology(LIST)4422 BelvauxLuxembourg

Utilizing machine learning techniques for data-driven diagnosis of high temperature PEM fuel cells is beneficial and meaningful to the system durability. Nevertheless, ensuring the robustness of diagnosis remains a critical and challenging task in real application. To enhance the robustness of diagnosis and achieve a more thorough evaluation of diagnostic performance, a robust diagnostic procedure based on electrochemical impedance spectroscopy (EIS) and a new method for evaluation of the diagnosis robustness was proposed and investigated in this work. To improve the diagnosis robustness: (1) the degradation mechanism of different faults in the high temperature PEM fuel cell was first analyzed via the distribution of relaxation time of EIS to determine the equivalent circuit model (ECM) with better interpretability, simplicity and accuracy;(2) the feature extraction was implemented on the identified parameters of the ECM and extra attention was paid to distinguishing between the long-term normal degradation and other faults;(3) a Siamese Network was adopted to get features with higher robustness in a new embedding. The diagnosis was conducted using 6 classic classification algorithms—support vector machine (SVM), K-nearest neighbor (KNN), logistic regression (LR), decision tree (DT), random forest (RF), and Naive Bayes employing a dataset comprising a total of 1935 collected EIS. To evaluate the robustness of trained models: (1) different levels of errors were added to the features for performance evaluation;(2) a robustness coefficient (Roubust_C) was defined for a quantified and explicit evaluation of the diagnosis robustness. The diagnostic models employing the proposed feature extraction method can not only achieve the higher performance of around 100% but also higher robustness for diagnosis models. Despite the initial performance being similar, the KNN demonstrated a superior robustness after feature selection and re-embedding by triplet-loss method, which sug

关键词： PEM fuel cell Data-driven diagnosis Robustness improvement and evaluation Electrochemical impedance spectroscopy

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Corrosion rate determination of rare-earth Mg alloys in a Na_(2)SO_(4)solution by electrochemical measurements and inductive coupled plasma-optical emission spectroscopy

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journal of Magnesium and Alloys 2019年第1期7卷 47-57页

作者： samuel Leleu Bertrand Rives Nicolas Causse Nadine Pébère CIRIMAT Universitéde ToulouseCNRSINPTUPSENSIACET4 allée Emile Monso BP4436231030 Toulouse cedex 4 France IRT Saint Exupéry 118 route de Narbonne-CS 4424831432 ToulouseFrance

The corrosion resistance of three Mg alloys containing rare-earth elements(WE43,EV31 and ZE41)was studied and compared to that of two Mg-Al alloys(AZ31 and AZ91)and of pure Mg(99.95 wt.%).Current-voltage curves and electrochemical impedance measurements were performed with rotating disk electrodes in an aerated 0.1 M Na_(2)SO_(4)*** all the alloys,it was confirmed that the intermetallic particles acted as local cathodes and that more protective films were formed on the alloys surface by comparison with the pure *** rates were determined from inductive coupled plasma-optical emission spectroscopy measurements and from the electrochemical *** corrosion rates were observed for the rare-earth Mg alloys compared to the AZ series *** data allowed the corrosion mechanisms to be discussed.

关键词： Magnesium alloys Rare-earth elements EIS ICP-OES Interface

Black TiO_(2) for solar hydrogen conversion

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journal of Materiomics 2017年第2期3卷 96-111页

作者： Bin Wang Shaohua Shen samuel S.Mao School of Science MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed MatterState Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi'an710049China International Research Centre for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi'an Jiaotong UniversityShaanxi710049China Xi'an jiaotong University Suzhou Academy SuzhouJiangsu215123China Department of Mechanical Engineering University of California at BerkeleyBerkeleyCA94720United States samuel Mao Institute of New Energy Science Hall1003 Shangbu RoadShenzhen518031China

Titanium dioxide(TiO_(2))has been widely investigated for photocatalytic H_(2) evolution and photoelectrochemical(PEC)water splitting since ***,its wide bandgap(3.0-3.2 eV)limits the optical absorption of TiO_(2) for sufficient utilization of solar *** TiO_(2) has been proposed as an effective strategy to enhance its solar absorption and thus the photocatalytic and PEC activities,and aroused widespread research *** this article,we reviewed the recent progress of black TiO_(2) for photocatalytic H_(2) evolution and PEC water splitting,along with detailed introduction to its unique structural features,optical property,charge carrier transfer property and related theoretical *** summarized in this review article,black TiO_(2) could be a promising candidate for photoelectrocatalytic hydrogen generation via water splitting,and continuous efforts are deserved for improving its solar hydrogen efficiency.

关键词： Black TiO_(2) Photoelectrochemical water splitting Photocatalytic Hydrogen evolution

Automated classification of big X-ray diffraction data using deep learning models

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npj Computational Materials 2023年第1期9卷 169-180页

作者： jerardo E.Salgado samuel Lerman Zhaotong Du Chenliang Xu Niaz Abdolrahim Materials Science program University of RochesterRochesterNew York 14627USA Department of Computer Science University of RochesterRochesterNew York 14627USA Department of Mechanical Engineering University of RochesterRochesterNew York 14627USA Laboratory for Laser Energetics University of RochesterRochesterNew York 14627USA

In current in situ X-ray diffraction(XRD)techniques,data generation surpasses human analytical capabilities,potentially leading to the loss of *** techniques require human intervention,and lack the performance and adaptability required for material *** the critical need for high-throughput automated XRD pattern analysis,we present a generalized deep learning model to classify a diverse set of materials’crystal systems and space *** our approach,we generate training data with a holistic representation of patterns that emerge from varying experimental conditions and crystal *** also employ an expedited learning technique to refine our model’s expertise to experimental *** addition,we optimize model architecture to elicit classification based on Bragg’s Law and use evaluation data to interpret our model’s *** evaluate our models using experimental data,materials unseen in training,and altered cubic crystals,where we observe state-of-the-art performance and even greater advances in space group classification.

关键词： Automate classify cubic

Experimental investigation of gaseous solvent huff-n-puff in the Middle Bakken Formation

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Petroleum Science 2023年第6期20卷 3488-3497页

作者： samuel Asante Afari Kegang Ling Demetrius Maxey Billel Sennaoui jerjes Hurtado Porlles Department of Petroleum Engineering University of North Dakota2844 Campus RdStop 8154Grand ForksND58202-6116USA

The efficacy of gaseous solvents in enhancing oil recovery(EOR)in unconventional reservoirs and the influence of operational and design parameters are still debated among the oil recovery research *** work investigated the recovery-enhancing capabilities of two potent gaseous solvents,CO_(2) and ethane,in tight core *** huff-n-puff(H-n-P)experiments were conducted under three miscibility conditions to investigate the influence of the key operating parameters and the dependency of their impact on the miscibility conditions and gas *** results show that oil recovery increased with increasing pressure from below(BM)to above(AM)miscibility pressure in a non-linear trend,irrespective of the gas ***,the influence of the soak period was noticeably dependent on the miscibility condition,specifically more remarkable under AM conditions and less apparent under BM ***,the effect of the production period was more pronounced at AM conditions for both ***,the impact of rock surface area-to-volume(SA/V)was only observed at BM,where both gases recovered more oil in the core samples with high SA/*** general,ethane showed a higher efficacy for oil recovery than CO_(2);CO_(2) recovered 21%–70%of oil in small core samples,while ethane could recover 32%–88%.The highest recovery was achieved with ethane injected under AM conditions,with a prolonged soak time,a short production period and into a core sample with a high SA/*** believe the findings from this work will help better understand and design H-n-P EOR projects.

关键词： Unconventional reservoirs Huff-n-puff Gas solvent Ethane CO_(2)miscibility

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Optimal control application to an Ebola model

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Asian Pacific journal of Tropical Biomedicine 2016年第4期6卷 283-289页

作者： Ebenezer Bonyah Kingsley Badu samuel Kwesi Asiedu-Addo Department of Mathematics and Statistics Kumasi Polytechnic Noguchi Memorial Institute for Medical Research College of Health ScienceUniversity of Ghana Faculty of Health Sciences Garden City University College Department of Mathematics Education University of Education

Ebola virus is a severe,frequently fatal illness,with a case fatality rate up to 90%.The outbreak of the disease has been acknowledged by World Health Organization as Public Health Emergency of International *** threat of Ebola in West Africa is still a major setback to the socioeconomic *** control theory is applied to a system of ordinary differential equations which is modeling Ebola infection through three different routes including contact between humans and a dead *** an attempt to reduce infection in susceptible population,a preventive control is put in the form of education and campaign and two treatment controls are applied to infected and late-stage infected(super) human *** Pontryagins maximum principle is employed to characterize optimality control,which is then solved *** is observed that time optimal control is existed in the *** activation of each control showed a positive reduction of *** overall effect of activation of all the controls simultaneously reduced the effort required for the reduction of the infection *** obtained results present a good framework for planning and designing cost-effective strategies for good interventions in dealing with Ebola *** is established that in order to reduce Ebola threat all the three controls must be taken into consideration concurrently.

关键词： Ebola Optimal control Pontryagins maximum principle Case finding Case holding

Review of current coal rib control practices

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Underground Space 2023年第2期9卷 53-75页

作者： Dogukan Guner samuel Nowak Taghi Sherizadeh Maurice Sunkpal Khaled Mohamed Yuting Xue Department of Mining and Explosives Engineering Missouri University of Science and TechnologyRollaMO 65409USA CDC NIOSH Pittsburgh Mining Research DivisionPittsburghPA 15236USA

The instability of coal ribs in underground mines continues to result in the injuries and fatalities of mine *** proper esti-mation and evaluation of primary and secondary support for coal ribs is still a challenging problem in the field of ground control science and requires further research and *** mining operations have various support design criteria and support methodologies for strata control,most rib support designs are still based on experience and local *** review study is intended to summarize the currently applied practices for rib support and control in various countries and mining ***,critical parameters that con-trol the amount and type of required rib support are considered and *** study revealed that among these parameters that control the stability of coal ribs,mining depth,rib height,cleat orientation/condition,and coal strength are the most significant ***,current rib support application methods were also *** to rock mass classification systems,some studies proposed a rib control rating system for practical estimation of the current rib condition and to estimate primary support *** studies are classified and summarized into two groups(categorical and empirical)based on the required inputs and *** based coal rib rating systems were closely examined,and the usefulness and intuitive aspects of each rating system were *** comprehensive literature review demonstrates that the Australian rating system,Analysis and Design of Rib Support(ADRS),and the new *** system,Coal Pillar Rib Rating(CPRR),are highly applicable for their regions.

关键词： Coal rib Ground control Rib support Rib control techniques ADRS CPRR

Review on the fully mulched ridge–furrow system for sustainable maize production on the semi-arid Loess Plateau

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journal of Integrative Agriculture 2023年第5期22卷 1277-1290页

作者： WANG jin-bin XIE jun-hong LI Ling-ling ADINGO samuel State Key Laboratory of Aridland Crop Science/College of Agronomy Gansu Agricultural UniversityLanzhou 730070P.R.China College of Forestry Gansu Agricultural UniversityLanzhou 730070P.R.China Faculty of Applied Sciences University for Development StudiesNavrongo-Upper East 00233Ghana

The fully mulched ridge–furrow(FMRF) system has been widely used on the semi-arid Loess Plateau of China due to its high maize(Zea mays L.) productivity and rainfall use efficiency. However, high outputs under this system led to a depletion of soil moisture and soil nutrients, which reduces its sustainability in the long run. Therefore, it is necessary to optimize the system for the sustainable development of agriculture. The development, yield-increasing mechanisms,negative impacts, optimization, and their relations in the FMRF system are reviewed in this paper. We suggest using grain and forage maize varieties instead of regular maize;mulching plastic film in autumn or leaving the mulch after maize harvesting until the next spring, and then removing the old film and mulching new film;combining reduced/notillage with straw return;utilizing crop rotation or intercropping with winter canola(Brassica campestris L.), millet(Setaria italica), or oilseed flax(Linum usitatissimum L.);reducing nitrogen fertilizer and partially replacing chemical fertilizer with organic fertilizer;using biodegradable or weather-resistant film;and implementing mechanized production. These integrations help to establish an environmentally friendly, high quality, and sustainable agricultural system, promote highquality development of dryland farming, and create new opportunities for agricultural development in the semi-arid Loess Plateau.

关键词： fully mulched ridge–furrow system semi-arid Loess Plateau maize productivity farming system sustainability

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Flexible organic light-emitting diodes for antimicrobial photodynamic therapy

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npj Flexible Electronics 2019年第1期3卷 114-119页

作者： Cheng Lian Marta Piksa Kou Yoshida Saydulla Persheyev Krzysztof j.Pawlik Katarzyna Matczyszyn Ifor D.W.samuel Organic Semiconductor Centre School of Physics and AstronomyUniversity of St AndrewsSt Andrews KY169SSUK Advanced Materials Engineering and Modelling Group Faculty of ChemistryWroclaw University of Science and TechnologyWrocławPoland Ludwik Hirszfeld Institute of Immunology and Experimental Therapy Polish Academy of SciencesWroclawPoland

Bacterial infection and the growth of antibiotic resistance is a serious problem that leads to patient suffering,death and increased costs of *** address this problem,we propose using flexible organic light-emitting diodes(OLEDs)as light sources for photodynamic therapy(PDT)to kill *** involves the use of light and a photosensitizer to generate reactive oxygen species that kill neighbouring *** have developed flexible top-emitting OLEDs with the ability to tune the emission peak from 669 to 737 nm to match the photosensitizer,together with high irradiance,low driving voltage,long operational lifetime and adequate *** features enable OLEDs to be the ideal candidate for ambulatory PDT light sources.A detailed study of OLED–PDT for killing Staphylococcus aureus was *** results show that our OLEDs in combination with the photosensitizer methylene blue,can kill more than 99%of *** indicates a huge potential for using OLEDs to treat bacterial infections.

关键词： diodes light PDT