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A glance at three-dimensional Alexandrov spaces

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Frontiers of Mathematics in China 2016年第5期11卷 1189-1206页

作者： fernando GALAZ-GARCIA Institut fur Algebra und Geometrie Karlsruher Institut fiir Technologie (KIT) Karlsruhe Germany

We discuss the topology and geometry of closed Alexandrov spaces of dimension three.

关键词： Alexandrov space group action 3-manifold

Electrochemical properties of AB_5 type hydrogen storage alloy as anode electrocatalyst of PEMFC

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中国有色金属学会会刊：英文版 2005年第2期15卷 361-365页

作者：陈昀王新华陈长聘陈立新 C.A.C.sequeira Department of Materials Science and Engineering Zhejiang University Hangzhou 310027 ChinaDepartment of Chemical Engineering Instituto Superior Tecnico Lisbon 1049-001 Portugal Department of Materials Science and Engineering Zhejiang University Hangzhou 310027 China Department of Chemical Engineering Instituto Superior Tecnico Lisbon 1049-001 Portugal

The electrocatalytic properties of hydrogen storage alloy（HSA） MlNi3.65Co0.85Al0.3Mn0.3 substituting Pt as anode electrocatalyst of PEMFC was investigated. It is found that, after being optimized, the electrocatalytic abilities of the HSA is reasonably good, the current density of the HSA anode membrane and electrode assembly（MEA） reaches 168 mA/cm2 at 0.5 V and 232.4 mA/cm2 at 0.2 V, and its power density reaches the maximum value of 84 mW/cm2. The influence of operating temperature and hydrogen pressure on the electrocatalytic behavior of HSA anode MEA is also discussed. At 60 ℃ under 2.02×105 Pa H2, the HSA anode shows the best electrochemical properties.

关键词：储氢合金镍钴锰合金燃料电池电化学性质

Non-steroidal anti-inflammatory drugs:What is the actual risk of liver damage?

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World Journal of Gastroenterology 2010年第45期16卷 5651-5661页

作者： fernando Bessone Department of Gastroenterology and Hepatology University of Rosario School of Medicine2000RosarioArgentina

Non-steroidal anti-inflammatory drugs (NSAIDs) constitute a family of drugs, which taken as a group, represents one of the most frequently prescribed around the world. Thus, not surprisingly NSAIDs, along with antiinfectious agents, list on the top for causes of DrugInduced Liver Injury (DILI). The incidence of liver disease induced by NSAIDs reported in clinical studies is fairly uniform ranging from 0.29/100 000 [95% confidence interval (CI): 0.17-051] to 9/100 000 (95% CI: 6-15). However, compared with these results, a higher risk of liver-related hospitalizations was reported (3-23 per 100 000 patients). NSAIDs exhibit a broad spectrum of liver damage ranging from asymptomatic, transient, hyper-transaminasemia to fulminant hepatic failure. However, under-reporting of asymptomatic, mild cases, as well as of those with transient liver-tests alteration, in conjunction with reports non-compliant with pharmacovigilance criteria to ascertain DILI and flawed epidemiological studies, jeopardize the chance to ascertain the actual risk of NSAIDs hepatotoxicity. Several NSAIDs, namely bromfenac, ibufenac and benoxaprofen, have been withdrawn from the market due to hepatotoxicity; others like nimesulide were never marketed in some countries and withdrawn in others. Indeed, the contro-versy concerning the actual risk of severe liver disease persists within NSAIDs research. The present work intends (1) to provide a critical analysis of the dissimilar results currently available in the literature concerning the epidemiology of NSAIDS hepatotoxicity; and (2) to review the risk of hepatotoxicity for each one of the most commonly employed compounds of the NSAIDs family, based on past and recently published data.

关键词： Non-steroidal anti-inflammatory drugs Side effects Fulminant hepatic failure Cholestasis Liver damage Liver injury Hepatitis Hepatotoxicity

Self-transforming stainless-steel into the next generation anode material for lithium ion batteries

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Journal of Energy Chemistry 2022年第1期31卷 432-441,I0012页

作者： Nimrod Harpak Guy Davidi fernando Patolsky School of Chemistry Faculty of Exact SciencesTel Aviv UniversityTel Aviv 69978Israel Department of Materials Science and Engineering the Iby and Aladar Fleischman Faculty of EngineeringTel Aviv University.Tel Aviv 69978Israel

Here,an extremely cost-effective and simple method is proposed in order to morphologically selftransform stain less steel from a completely inactive material to a fully operati onal,nanowire-structured,3D anode material for lithium ion *** reagentless process of a single heating step of the plain stainless steel in a partially reduci ng atmosphere,converts the stain less steel into an active anode via metal-selective oxidation,creating vast spinel-structured nanowires directly from the electrochemically in active *** simple process allows the complete utilizati on of the 3D mesh structure as the electrochemically-active spinel nanowires greatly enhance the active surface *** novel material and architecture exhibits high capacities(-1000 mAh/g after-400 cycles),long cycle life(>1100 cycles)and fast rate performance(>2C).Simple modulation of the substrate can result in very high areal and volumetric ***,areal capacities greater than 10 mAh/cm^(2) and volumetric capacities greater than 1400 mAh/cm^(3) can be *** the proposed method,the potential reduction in cost from the use of battery-grade graphite is at least an order of magnitude,with considerable better results achieved in terms of capacity and intrinsic structural benefits of the substrate,which include direct contact of the active material with the current collector,lack of delamination and binder-free *** work provides a new paradigm and a key step in the long route to replace the commercial graphite anode as the next-geneation anode material.

关键词： Stainless steel Anode material Transition metal oxide Energy storage MnCr_(2)O_(4) Lithium ion batteries

Dicroerisma (Actiniscales, Dinophyceae) in the open Pacific Ocean, a gymnodinioid dinoflagellate with an endoskeleton

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Chinese Journal of Oceanology and Limnology 2008年第1期26卷 116-120页

作者： fernando GóMEZ Station Marine de Wimereux Université des Sciences et Technologies de Lille-Lille1 FRE 2816 ELICO CNRS 28 Avenue Foch BP 80 F-62930 Wimereux France

This study is the first to describe and illustrate the dinoflagellate genus Dicroerisma in the open Pacific Sea and in the southern hemisphere. Eleven individuals ascribed to Dicroerisma psilonereiella were encountered in subsurface waters (>70 m depth) from 34°N to 33°S. Another specimen that differs from the type is also illustrated. These findings reveal that Dicroerisma is a widespread genus and that there is tentative existence of another species within the genus.

关键词： Dicroerisma psilonereiella Actiniscales axostyle endoskeleton Dinophyceae the Pacific Ocean

Enhanced capacity to CO2 sorption in humid conditions with a K-doped biocarbon

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Journal of Energy Chemistry 2019年第7期28卷 208-219页

作者： Nausika Querejeta fernando Rubiera Covadonga Pevida Instituto Nacional del Carbón

Solid sorbents with enhanced capacity and selectivity towards CO2 are crucial in the design of an efficient capture *** the possible alternatives,K2CO3-doped activated carbons have shown high CO2 capture capacity and rapid carbonation reaction *** this work,a sustainable and low-cost approach is developed with a biomass-based activated carbon or biocarbon as *** CO2 capture performance in cyclic sorption–desorption operation and the sorption kinetics have been investigated under different scenarios in a purpose-built fixed-bed *** of the H2O concentration in the flue gas,a constant relative humidity(~20%)in the K2CO3-doped biocarbon bed promoted the carbonation reaction and boosted the CO2 sorption capacity(1.92 mmol/g at 50℃ and 14 kPa partial pressure of CO2).Carbonation is slower than physical adsorption of CO2 but wise process design could tune the operation conditions and balance capture capacity and sorption kinetics.

关键词： Biocarbon K2CO3 CO2 sorption Humid flue gas

E-Commerce Fraud Detection Based on Machine Learning Techniques:Systematic Literature Review

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Big Data Mining and Analytics 2024年第2期7卷 419-444页

作者： Abed Mutemi fernando Bacao NOVA Information Management School(NOVA IMS) Universidade Nova de LisboaCampus de CampolideLisboa 1070-312Portugal

The e-commerce industry’s rapid growth,accelerated by the COVID-19 pandemic,has led to an alarming increase in digital fraud and associated *** establish a healthy e-commerce ecosystem,robust cyber security and anti-fraud measures are ***,research on fraud detection systems has struggled to keep pace due to limited real-world *** in artificial intelligence,Machine Learning(ML),and cloud computing have revitalized research and applications in this *** ML and data mining techniques are popular in fraud detection,specific reviews focusing on their application in e-commerce platforms like eBay and Facebook are lacking *** reviews provide broad overviews but fail to grasp the intricacies of ML algorithms in the e-commerce *** bridge this gap,our study conducts a systematic literature review using the Preferred Reporting Items for Systematic reviews and Meta-Analysis(PRISMA)*** aim to explore the effectiveness of these techniques in fraud detection within digital marketplaces and the broader e-commerce *** the current state of the literature and emerging trends is crucial given the rising fraud incidents and associated *** our investigation,we identify research opportunities and provide insights to industry stakeholders on key ML and data mining techniques for combating e-commerce *** paper examines the research on these techniques as published in the past *** the PRISMA approach,we conducted a content analysis of 101 publications,identifying research gaps,recent techniques,and highlighting the increasing utilization of artificial neural networks in fraud detection within the industry.

关键词： E-commerce Machine Learning(ML) systematic review fraud detection organized retail fraud

Performance Comparison of Field-oriented Control,Direct Torque Control,and Model-predictive Control for SynRMs

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Chinese Journal of Electrical Engineering 2022年第1期8卷 24-37页

作者： Hazem Hadla fernando Santos Polytechnic Institute of Viseu Higher School of Technology and Management of LamegoLamego 5100-074Portugal

Simulation studies of three synchronous reluctance motor(SynRM)control strategies are presented:field-oriented control(FOC),direct torque control(DTC),and finite-set model-predictive control(FS-MPC).FOC uses linear controllers and pulse-width modulation to control the fundamental components of the load voltages *** contrast,DTC and FS-MPC are nonlinear strategies wherein the voltage vectors are directly generated in the absence of a *** operating principles and control structures of these control strategies are ***,a comparative analysis of the static and dynamic performance of the control strategies is conducted using Matlab/Simulink to identify their advantages and *** is confirmed that each of the control strategies has merits and that all three of them satisfy the requirements of modern high-performance drives.

关键词： Field-oriented control direct torque control model-predictive control synchronous reluctance motor

ParSymG: a parallel clustering approach for unsupervised classification of remotely sensed imagery

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International Journal of Digital Earth 2017年第5期10卷 471-489页

作者： Zhenhong Du Yuhua Gu Chuanrong Zhang Feng Zhang Renyi Liu Jean sequeira Weidong Li Geographic Information Science Institution School of Earth SciencesZhejiang UniversityHangzhouPeople’s Republic of China Zhejiang Key Laboratory of Geographic Information System Zhejiang UniversityHan gzhouPeople’s Republic of China Geography and Center for Envrionmental Sciences and Engineering University of ConnecticutStorrsCTUSA Department of Computer Science Aix-Marseille UniversityMarseilleFrance

Symmetry is a common feature in the real *** may be used to improve a classification by using the point symmetry-based distance as a measure of ***,it is time consuming to calculate the point symmetry-based *** an efficient parallel point symmetry-based K-means algorithm(ParSym)has been propsed to overcome this limitation,ParSym may get stuck in sub-optimal solutions due to the K-means technique it *** this study,we proposed a novel parallel point symmetry-based genetic clustering(ParSymG)algorithm for unsupervised *** genetic algorithm was introduced to overcome the sub-optimization problem caused by inappropriate selection of initial centroids in ParSym.A message passing interface(MPI)was used to implement the distributed master–slave *** make the algorithm more time-efficient,a three-phase speedup strategy was adopted for population initialization,image partition,and kd-tree structure-based nearest neighbor *** advantages of ParSymG over existing ParSym and parallel K-means(PKM)alogithms were demonstrated through case studies using three different types of remotely sensed *** in speedup and time gain proved the excellent scalability of the ParSymG algorithm.

关键词： Unsupervised classification parallel clustering genetic algorithm point symmetry-based distance