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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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Leadership and Top Management Influence on Total Quality Management Implementation in the Ghanaian Construction Industry

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Journal of Building Construction and Planning Research 2024年第2期12卷 37-51页

作者： Ansah samuel Kwame Tekpe Emmanuel Ametepey simon Ofori Department of Construction Technology and Management Cape Coast Technical University Cape Coast Ghana Department of Building Technology Koforidua Technical University Koforidua Ghana

This study aims to determine the key and underlying Leadership and Top Management (LTM) factors that have a significant impact on sustaining the implementation of Total Quality Management (TQM) within the construction industry in Ghana. The research methodology employed in this study was a quantitative technique. Questionnaires were distributed to 641 participants within construction industry in Ghana. Questionnaires retrieved for the analysis were 536. Three steps approached were used for the data analysis. These include Exploratory Factor Analysis (EFA), Confirmatory Factor Analysis (CFA), and Structural Equation Modeling (SEM) analysis. After conducting the EFA and CFA, SEM was also used to analyze the construct validity. The SEM analysis helps to determine four key indicator variables for the leadership and top management construct. These include Leadership/Top Management approach to employees’ management, Leadership/Top Management understanding of TQM, Leadership/Top Management empowerment of employees to resolve quality issues, and Leadership/Top Management endorsement of TQM. All the four indicator variables were found to be good of fit and closely associated with the dependent variable. The study adds to the body of knowledge by using EFA, CFA and SEM techniques to establish key leadership and top management factors affecting TQM implementation in Ghana’s construction industry. The findings in general suggested that leadership and top Management factors identified have a direct positive impact on sustaining TQM implementation in the Ghanaian construction industry. Consequently, the leadership and top management factors identified in this study can help improve TQM in the Ghanaian construction industry.

关键词： Construction Industry Leadership Top management Total Quality Management

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Inaccuracies in the history of a well-known introduction:a case study of the Australian House Sparrow(Passer domesticus)

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Chinese Birds 2016年第2期7卷 95-109页

作者： samuel C.Andrew simon C.Griffith Department of Biological Sciences Macquarie University

Background:Modern ecosystems contain many invasive species as a result of the activity of acclimatisation societies that operated in the second half of the nineteenth century,and these species provide good opportunities for studying invasion ***,to gain insight into the ecological and genetic mechanisms that determine the rate of colonization and adaptation to new environments,we need a good understanding of the history of the introduced species,and a knowledge of the source population,timing,and number of individuals introduced is particularly ***,any inaccuracies in the history of an introduction will affect subsequent assumptions and ***:Focusing on a single well-known species,the House Sparrow(Passer domesticus),we have documented the introduction into Australia using primary sources(*** records and newspaper articles).Results:Our revised history differs in a number of significant ways from previous *** evidence indicates that the House Sparrow was not solely introduced from source populations in England but also from Germany and most strikingly also from India—with the latter birds belonging to a different *** also clarify the distinction between the number released and the number of founders,due to pre-release captive breeding programs,as well as identifying inaccuracies in a couple of well-cited sources with respect to the range expansion of the introduced ***:Our work suggests that caution is required for those studying introductions using the key sources of historical information and ideally should review original sources of information to verify the accuracy of published accounts.

关键词： Acclimatisation Bottlenecks Propagule size Range expansion Hybridisation

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Invasion genetics： Lessons from a ubiquitous bird, the house sparrow Passer domesticus

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Current Zoology 2015年第3期61卷 465-476页

作者： Andrea L. LIEBL Aaron W. SCHREY samuel C. ANDREW Elizabeth L.SHELDON simon C. GRIFFITH University of Exeter ComwaU Campus Penryn Cornwall TR10 9EZ UK Department of Biology Armstrong State University Savannah GA31419 USA Department of Biological Sciences Macquarie University Sydney NSW 2109 Australia

Following an introduction, non-native species are exposed to environments that differ from those found in their native range; further, as these non-native species expand beyond the site of introduction, they must constantly adapt to novel environ- ments. Although introduced species are present across most ecosystems, few species have successfully established themselves on a truly global scale. One such species, the house sparrow Passer domesticus, is now one of the world＇s most broadly distributed vertebrate species and has been introduced to a great part of its current range. To date, work on four continents suggests both ge- netic and phenotypic variation exists between native and introduced ranges. As such, house sparrows represent an excellent op- portunity to study adaptations to novel environments and how these adaptations are derived. The global distribution of this spe- cies and the multiple independent introductions to geographically isolated sites allow researchers to ask questions regarding ge- netic variation and adaptation on a global scale. Here, we summarize the molecular studies of invasive house sparrows from the earliest work using allozymes through more recent work on epigenetics; using these studies, we discuss patterns of dispersal of this species. We then discuss future directions in techniques （e.g. next generation sequencing） and how they will provide new in- sight into questions that are fundamental to invasion biology. Finally, we discuss how continued research on the house sparrow in light of these genetic changes and adaptations will elucidate answers of adaptation, invasion biology, range expansion, and resi- lience in vertebrate systems generally

关键词： House sparrow Invasive Passer domesticus

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Growth Performance, Undergrowth Diversity and Carbon Sequestration Potentials of Tree Species Stand Combinations, Ghana

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Open Journal of Forestry 2020年第1期10卷 135-154页

作者： samuel Novor simon Abugre Department of Forest Science University of Energy and Natural Resources Sunyani Ghana

The limited number of studies on mixed plantations makes it difficult to accurately predict success of mixed-species combination especially with regards to growth, undergrowth diversity and carbon sequestration potentials. This study therefore provides information on the effects of Ceiba pentandra, Terminalia superba, Cedrela odorata and Khaya anthotheca in three different stand combinations on growth, undergrowth diversity and carbon sequestration potential. A 15-year-old coupe of 32 ha of mixed tree species stand combinations was selected for the study. The coupe was stratified based on the species combinations. Nested sub-plots (25 m × 25 m) were randomly laid in different species stand combinations for growth data collection. In each nested sub-plot, 1 m × 1 m plots were also randomly laid for undergrowth diversity study. The results revealed that two species stand combination of Ceiba pentandra and Terminalia superba performed better in terms of growth, carbon sequestration and carbon content as compared to the other species stand combinations. The saplings on the other hand, were more diverse under the three species stand combination plots. Also, the effective number of species, species richness, evenness, and dominance were higher in the four species stand combination plots. Generally, Ceiba pentandra and Terminalia superba are compatible as it produced the highest growth and carbon sequestration potential.

关键词： Species Combination Growth Floristic Composition Carbon Content Saplings

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Constitutive Elements of Non-Abelian Gauge Theories

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Journal of Modern Physics 2015年第1期6卷 58-69页

作者： Ademir E. Santana samuel simon International Center for Condensed Matter Physics Instituto de Fisica Universidade de Brasilia Brasilia Brazil Deaprtamento de Filosofia Universidade de Brasilia Brasilia Brazil

A set, S, of constitutive elements characterizing mechanical theories is defined. In S, the role played by concepts such as mass, particle, fields and symmetry is discussed. This structure is first used to consider the Nother’s theorem from an algebraic point of view. As examples, we explore non-relativistic quantum mechanics and special relativistic particles. The set S is then applied to analyze non-abelian gauge theories, considering the Higgs mechanism for generation of mass.

关键词： Gauge Fields Constitutive Elements Lie Symmetry

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Is routine measurement of international normalized ratio necessary as part of the investigation of patients with cardiac-type chest pain?

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World Journal of Emergency Medicine 2021年第3期12卷 221-224页

作者： samuel G.Campbell Kirk Magee Ismail Cajee simon Field Michael B.Butler Christine L.Campbell Sarah E.Bryson Charles V.Keating Emergency and Trauma Centre Queen Elizabeth II HSCHalifaxNova Scotia B3H 3A7Canada

Dear editor, Chest pain is a frequent complaint of patients presenting to the emergency department (ED), and many of them are referred to the cardiology service for further investigation. At the Charles V. Keating Emergency and Trauma Centre in Halifax, Nova Scotia, Canada, 4,800 (6.6%) of the approximately 73,000 patients per year register with a complaint of “chest pain”, and 20% of patients are referred to cardiology. Coagulation studies, specifi cally international normalized ratio (INR) frequently part of the “routine” panel of blood tests, are ordered for patients in the ED being investigated or treated for chest pain suspected to be cardiac in nature. Recent calls to examine how much of our practice is likely to benefit patients in any way have led us to question the clinical utility of routine use of these tests.

关键词： routine patients pain

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Strategies for Sustainable Environmental Management of Construction Activities in Ghana

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Journal of Building Construction and Planning Research 2020年第3期8卷 180-192页

作者： simon Ofori Ametepey samuel Ansah William Gyadu-Asiedu Koforidua Technical University Koforidua Ghana Building Technology Department Cape Coast Technical University Cape Coast Ghana Faculty of Built & Natural Environment Koforidua Technical University Koforidua Ghana

The Ghanaian construction industry continues to improve by the recent intensification of infrastructure development by government and the private sector. Nonetheless, this is happening with a strong focus on economic development to the detriment of the environment these activities affect. This paper focuses on identifying the strategies by which sustainable environmental management could be structured to mitigate the impact of construction activities in Ghana. A mixed-method research approach was adopted. Quantitative data were collected from 83 practitioners in the construction industry, while qualitative data were elicited from 18 Construction and Environmental Management practitioners. The mean scores indicated that all the 20 strategies for integrating environmental concerns into construction activities in Ghana were considered significant by the respondents. The empirical findings of the study indicate that for environmental concerns to be effectively integrated into construction activities in Ghana, a concerted effort will be required from the various actors within the construction industry. These include the role of clients in selecting environmentally conscious service providers, designers focusing on environmentally friendly construction materials and methods, reduce, recycling and reuse of waste materials, the commitment of government towards sustainable development, and well-structured educational campaigns to promote environmentally sustainable construction activities.

关键词： Construction Industry Environmental Management Strategies Sustainable Construction Sustainable Development

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An Optimal Cooling Schedule Using a Simulated Annealing Based Approach

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Applied Mathematics 2017年第8期8卷 1195-1210页

作者： Alex Kwaku Peprah simon Kojo Appiah samuel Kwame Amponsah Department of Computer Science Catholic University College of Ghana Sunyani Ghana Department of Mathematics College of Science Kwame Nkrumah University of Science and Technology Kumasi Ghana

Simulated annealing (SA) has been a very useful stochastic method for solving problems of multidimensional global optimization that ensures convergence to a global optimum. This paper proposes a variable cooling factor (VCF) model for simulated annealing schedule as a new cooling scheme to determine an optimal annealing algorithm called the Powell-simulated annealing (PSA) algorithm. The PSA algorithm is aimed at speeding up the annealing process and also finding the global minima of test functions of several variables without calculating their derivatives. It has been applied and compared with the SA algorithm and Nelder and Mead Simplex (NMS) methods on Rosenbrock valleys in 2 dimensions and multiminima functions in 3, 4 and 8 dimensions. The PSA algorithm proves to be more reliable and always able to find the optimum or a point very close to it with minimal number of iterations and computational time. The VCF compares favourably with the Lundy and Mees, linear, exponential and geometric cooling schemes based on their relative cooling rates. The PSA algorithm has also been programmed to run on android smartphone systems (ASS) that facilitates the computation of combinatorial optimization problems.

关键词： Simulated Annealing (SA) Variable Cooling Factor (VCF) Powell-Simulated Annealing (PSA) Global Minima Rosenrock Functions Android Smartphone Systems (ASS)

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SAHA attenuates Takotsubo-like myocardial injury by targeting an epigenetic Ac/Dc axis

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Signal Transduction and Targeted Therapy 2021年第5期6卷 1429-1432页

作者： Ishant Khurana Scott Maxwell simon Royce Prabhu Mathiyalagan Tom Karagiannis Nadia Mazarakis Jitraporn Vongsvivut Harikrishnan K.N. Jun Okabe Keith Al-Hasani Chrishan samuel Assam El-Osta Human Epigenetics Program Department of DiabetesCentral Clinical SchoolMonash UniversityMelbourneVICAustralia Cardiovascular Disease Program Monash Biomedicine Discovery Institute and Department of PharmacologyMonash UniversityClaytonVICAustralia Infrared Microspectroscopy Beamline ANSTO-Australian SynchrotronClaytonVICAustralia Department of Medicine and Therapeutics The Chinese University of Hong Kong(CUHK)Hong Kong SARHong Kong Institute of Diabetes and ObesityCUHKHong Kong SARPrince of Wales HospitalLi Ka Shing Institute of Health SciencesCUHKShatinHong KongChina University College Copenhagen Faculty of HealthDepartment of TechnologyBiomedical Laboratory ScienceCopenhagenDenmark

Dear Editor,Takotsubo syndrome(TS)is a stress-induced non-ischaemic cardiomyopathy that is more common in women,but is associated with higher morbidity and mortality in *** known as broken-heart syndrome,TS is characterised by transient left ventricular(LV)dysfunction independent of obstructive coronary artery *** is a polygenic condition and nowhere is this more evident than the use of positive inotropes,such as isoprenaline(ISO)in pre-clinical models.1 There is no standard therapy for broken-heart syndrome because the mechanisms underlying the condition remain ***,there is no consensus on predisposition for Takotsubo2 and our goal was to better understand the regulatory mechanism as a first step towards improved treatment *** acid or SAHA,a drug approved for cancer treatment by the US Food and Drug Administration has previously been shown to improve cardiopulmonary function.3 We tested the hypothesis that the cardioprotective benefit of SAHA in a pre-clinical model of Takotsubo is conferred by an epigenetic acetylation/deacetylation(Ac/Dc)axis.

关键词： SAHA Takotsubo protective

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