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Thermoelectric and electrical characteristics of SmS ceramic samples after exposure to a pulsed magnetic field

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Journal of Rare Earths 2022年第11期40卷 1778-1784,I0004页

作者： ivan Volchkov Evgeniy Baskakov Vladimir Strelov Vladimir Kanevskii FSRC"Crystallography and Photonics"RAS Leninskiy Prospekt 59119333MoscowRussia

Samarium monosulfide(SmS)is a promising material for creating thermoelectric generators(TEG),gas sensors and strain *** the high values of the generated thermo electromotive force(TEMF)(α≈170-350μV/K),methods for increasing the efficiency of TEGs based on SmS are of considerable *** of these methods can be short-term effects of magnetic fields,including pulsed ones,on these *** action of a pulsed magnetic field(PMF)leading to an increase in TEMF(U)of SmS ceramic samples is *** that are not subjected to high frequency currents(HFC)annealing show an increase in UT of 44.54%-62.18%(from 11.9 to 17.2-19.3 mV).The conductivity(σ)of the samples is~22 Q/cm and is insensitive to short-term exposure to a *** that undergo HFC annealing show an increase in Uof 23.47%-41.31%(from 21.3 to 26.3-30.1 mV)after exposure to a *** conductivity of the samples is~15Ω^(-1)/cm and after a short exposure to the PMF is changing nonmo notonically,with an increase in the overall *** difference in the values of Uand a can be explained by presence of an ordered grain structure and a significant amount of the Sm_(2)O_(2)S phase in the samples subjected to HFC *** mechanisms of the observed changes are discussed.

关键词： Rare earths Thermoelectric Electric properties Magnetically induced changes Samarium monosulfide

A theoretical justification of the slip index concept in fretting analysis

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Friction 2023年第7期11卷 1265-1275页

作者： ivan I.ARGATOV Young S.CHAI Institut für Mechanik Technische Universität Berlin10623 BerlinGermany School of Mechanical Engineering Yeungnam UniversityGyeongsan 712-749Republic of Korea

Fretting in the partial-slip and gross-slip regimes under a constant normal load is *** tangential force-displacement relations for the forward and backward motions are described based the generalized Cattaneo-Mindlin theory of tangential contact and Masing's hypothesis on modelling the force-displacement hysteretic *** the critical force and displacement parameters(characterizing the triggering of sliding),the model includes one dimensionless fitting parameter that tunes the tangential contact stiffness of the friction-contact *** expressions are derived for the main tribological parameters of the fretting loop,including the slip index and the signal *** presented phenomenological modelling approach has been applied to the analysis of two sets of experimental data taken from the *** has been shown that the experimentally observed simple relation of a rational type between the slip index and the slip ratio corresponds to the gross-slip asymptotics of the corresponding model-based predicted *** known quantitative criteria for the transition from the partial slip regime to the gross slip regime are expressed in terms of the stiffness parameter,and a novel geometric transition criterion is formulated.

关键词： fretting wear slip index signal index partial slip energy ratio

Sustainable and biocompatible Zn-based batteries

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National Science Review 2023年第4期10卷 8-9页

作者： Guanjie He ivan P.Parkin Department of Chemical Engineering University College London Christopher Ingold Laboratory Department of Chemistry University College London

Next-generation and functional batery technologies beyond the Li-ion are emerging [1]. Sustainable and biocompatible bateries are needed for certain applications, including implantable medical devices [2]. Zinc-based ... 详细信息

关键词： ELECTROLYTE

Integrated view of plant metabolic defense with particular focus on chewing herbivores

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Journal of Integrative Plant Biology 2022年第2期64卷 449-475页

作者： David Wari Takako Aboshi Tomonori Shinya ivan Galis Institute of Plant Science and Resources Okayama UniversityKurashiki710-0046 Japan Faculty of Agriculture Yamagata UniversityWakaba-machiTsuruoka997-8555 Japan

Success of plants largely depends on their ability to defend against *** emergence of the first voracious consumers,plants maintained adapting their structures and chemistry to escape from *** constant pressure was further accelerated by adaptation of herbivores to plant defenses,which all together sparked the rise of a chemical empire comprised of thousands of specialized metabolites currently found in *** diversity in the plant kingdom is truly amazing,and although many plant metabolites have already been identified,a large number of potentially useful chemicals remain unexplored in plant ***,biosynthetic routes for plant metabolites involve many enzymes,some of which still wait for identification and biochemical ***,regulatory mechanisms that control gene expression and enzyme activities in specialized metabolism of plants are scarcely ***,understanding of how plant defense chemicals exert their toxicity and/or repellency against herbivores remains limited to typical examples,such as proteinase inhibitors,cyanogenic compounds and *** this review,we attempt summarizing the current status quo in metabolic defense of plants that is predominantly based on the survey of ubiquitous examples of plant interactions with chewing herbivores.

关键词： defense herbivore mode of action plant specialized metabolism

Migration of organic carbon and trace elements in the system glacier-soil in the Central Caucasus alpine environment

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Journal of Mountain Science 2022年第12期19卷 3458-3474页

作者： ivan KUSHNOV Evgeny ABAKUMOV Rustam TEMBOTOV Timur NIZAMUTDINOV Saint Petersburg State University 7/9 University EmbankmentSt Petersburg199034Russia Tembotov Institute of Ecology of Mountain Territories of Russian Academy of Sciences 7a I.Armand StreetNalchik360051Russia

Rapid deglaciation is one of the most important challenges in the Earth science *** reason of this is specific supraglacial sediments–cryoconites,which represent carbon-containing dust with organomineral matter and living *** of physical and chemical characteristics of cryoconites in the Central Caucasus is necessary in order to understand their influence on alpine territories biogeochemical cycles,pollution and development in conditions of intensive glacial melting and active anthropogenic *** this research cryoconites as well as moraines,soil-like bodies and soils have been sampled from the alpine Bezengi Glacier and adjacent Khulamo-Bezengi *** physicochemical features(pH values,total organic carbon content,microbial respiration,particle-size distribution)as well as content of trace elements have been defined in sampled materials and several pollution indices(Geoaccumulation index,Contamination factor and Degree of pollution)have been *** obtained show low values of total organic carbon in cryoconites(max.0.23%)but high values(max.7.54%)in top horizon of soils located in floodplain,indicating its active fluvioglacial transfer which may further accelerate the development of *** activity in the studied soils was mostly influenced by additional input of labile organic carbon from cryoconites with water ***-size distribution was similar among the studied cryoconites,indicating dominance of sand fraction(up to 85.28%)while studied soils showed higher variability due to influence of *** the trace elements,cryoconites were mostly polluted by Zn(max.85.70 mg·kg^(-1))which corresponds to high pollution according to pollution indices;Pb(max.24.90 mg·kg^(-1))and Cu(max.17.40 mg·kg^(-1)),up to moderate pollution *** of polluted cryoconite material as well as local anthropogenic activities increased pollution of periglacial soils by Zn(max.89.20 mg·kg^(-1)),Pb(m

关键词： Cryoconites Umbrisols Leptosols Pollution Caucasus mountain range

Magnetic Moment Tensor Potentials for collinear spin-polarized materials reproduce different magnetic states of bcc Fe

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npj Computational Materials 2022年第1期8卷 107-112页

作者： ivan Novikov Blazej Grabowski Fritz Körmann Alexander Shapeev Skolkovo Institute of Science and Technology Skolkovo Innovation CenterNobel St.3Moscow143026Russia Institute for Materials Science University of StuttgartPfaffenwaldring 5570569StuttgartGermany Computational Materials Design Max-Planck-Institut für Eisenforschung GmbHD-40237DüsseldorfGermany Materials Science and Engineering Delft University of Technology2628 CDDelftThe Netherlands

We present the magnetic Moment Tensor Potentials(mMTPs),a class of machine-learning interatomic potentials,accurately reproducing both vibrational and magnetic degrees of freedom as provided,e.g.,from first-principles *** accuracy is achieved by a two-step minimization scheme that coarse-grains the atomic and the spin *** performance of the mMTPs is demonstrated for the prototype magnetic system bcc iron,with applications to phonon calculations for different magnetic states,and molecular-dynamics simulations with fluctuating magnetic moments.

关键词： magnetic fluctuating states

Deep Transfer Learning Approach for Robust Hand Detection

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Intelligent Automation & Soft Computing 2023年第4期36卷 967-979页

作者： Stevica Cvetkovic Nemanja Savic ivan Ciric Faculty of Electronic Engineering University of NisNis18000Serbia Faculty of Mechanical Engineering University of NisNis18000Serbia

Human hand detection in uncontrolled environments is a challenging visual recognition task due to numerous variations of hand poses and background image *** achieve highly accurate results as well as provide real-time execution,we proposed a deep transfer learning approach over the state-of-the-art deep learning object *** method,denoted as YOLOHANDS,is built on top of the You Only Look Once(YOLO)deep learning architecture,which is modiﬁed to adapt to the single class hand detection *** model transfer is performed by modifying the higher convolutional layers including the last fully connected layer,while initializing lower non-modiﬁed layers with the generic pre-trained *** address robustness issues,we introduced a comprehensive augmentation procedure over the training image dataset,speciﬁcally adapted for the hand detection *** evaluation of the proposed method,which is performed on a challenging public dataset,has demonstrated highly accurate results,comparable to the state-of-the-art methods.

关键词： Deep learning model object detection hand detection transfer learning data augmentation

Market Power of Coordinated Hydro-wind Joint Bidding:Croatian Power System Case Study

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Journal of Modern Power Systems and Clean Energy 2022年第2期10卷 531-541页

作者： Perica Ilak Igor Kuzle Lin Herencic Josip Dakovic ivan Rajsl the University of Zagreb Faculty of Electrical Engineering and ComputingZagrebCroatia

The paper analyses the coordinated hydro-wind power generation considering joint bidding in the electricity *** impact of mutual bidding strategies on market prices,traded volumes,and revenues has been *** coordination assumes that hydro power generation is scheduled mainly to compensate the differences between actual and planned wind power *** potential of this coordination in achieving and utilizing of market power is *** market equilibrium of asymmetric generation companies is analyzed using a game theory *** assumed market situation is imperfect competition and non-cooperative game.A nu-merical approximation of the asymmetric supply function equilibrium is used to model this *** introduced novelty is the application of an asymmetric supply function equilibrium approximation for coordinated hydro-wind power *** model is tested using real input data from the Croatian power system.

关键词： Asymmetric firm bidding strategy coordination hydro power wind power imperfect competition market power non-cooperative game optimal bidding strategy supply function equilibrium

Colonization–competition dynamics of basal species shape food web complexity in island metacommunities

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Marine Life Science & Technology 2023年第2期5卷 169-177页

作者： Guanming Guo Fei Zhao ivan Nijs Jinbao Liao Ministry of Education’s Key Laboratory of Poyang Lake Wetland and Watershed Research School of Geography and EnvironmentJiangxi Normal UniversityNanchang 330022China Research Group in Plants and Ecosystems Department of BiologyUniversity of Antwerp2610 WilrijkBelgium

Exploring how food web complexity emerges and evolves in island ecosystems remains a major challenge in *** webs assembled from multiple islands are commonly recognized as highly complex trophic networks that are dynamic in both space and *** the context of global climate change,it remains unclear whether food web complexity will decrease in a monotonic fashion when undergoing habitat destruction(e.g.,the inundation of islands due to sea-level rise).Here,we develop a simple yet comprehensive patch-dynamic framework for complex food web metacommunities subject to the competition-colonization tradeof between basal *** found that oscillations in food web topological complexity(characterized by species diversity,mean food chain length and the degree of omnivory)emerge along the habitat destruction *** outcome is robust to changing parameters or relaxing the assumption of a strict competitive *** oscillations in food web complexity indicates that small habitat changes could have disproportionate negative efects on species diversity,thus the success of conservation actions should be evaluated not only on changes in biodiversity,but also on system robustness to habitat ***,this study provides a parsimonious mechanistic explanation for the emergence of food web complexity in island ecosystems,further enriching our understanding of metacommunity assembly.

关键词： Competition-colonization tradeof Food web complexity Hierarchical competition Patch-dynamic framework Patch loss