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Extreme biomimetic approach for developing novel chitin-GeO2 nanocomposites with photoluminescent properties

Nano Research 2015年第7期8卷 2288-2301页

作者： Marcin Wysokowski Mykhailo Motylenko Jan Beyer Anna Makarova Hartmut Stocker Juliane Walter Roberta Galli Sabine Kaiser denis vyalikh Vasilii V. Bazhenov laroslav Petrenko Allison L Stelling Serguei L. Molodtsovs Dawid Stawski Krzysztof J.Kurzydfowski Enrico Langer Mikhail V Tsurkan Teofil Jesionowski Johannes Heitmann Dirk C. Meyer Hermann Ehrlich Institute of Chemical Technology and Engineering Poznan University of Technology 60965 Poznan Poland Institute of Materials Science TU Bergakademie Freiberg 09599 Freiberg Germany Institute of Applied Physics TU Bergakademie Freiberg 09599 Freiberg Germany Institute of Solid State Physics Dresden University of Technology 01069 Dresden Germany Institute of Experimental Physics TU Bergakademie Freiberg 09599 Freiberg Germany Faculty of Medicine Carl Gustav Carus Department of Anaesthesiology and Intensive Care Medicine Clinical Sensoring and Monitoring TU Dresden 01069 Dresden Germany epartment of Physics St. Petersburg State University 198504 St. Petersburg Russia Department of Mechanical Engineering and Materials Science Duke University 27708 Durham NC USA European X-Ray Free-Electron Laser Facility (XFEL) GmbH 22761 Hamburg Germany ITMO University 197101 St. Petersburg Russia Department of Commodity and Material Sciences and Textile Metrology Technical University of Lodz 90924 LSdz Poland Materials Design Group Faculty of Materials Science and Engineering Warsaw University of Technology PL-02507 Warsaw Poland Institute of Semiconductors and Microsystems TU Dresden 01062 Dresden Germany Leibniz Institute of Polymer Research Max Bergmann Centre for Biomaterials 01062 Dresden Germany

This work presents an extreme biomimetics route for the creation of nano- structured biocomposites utilizing a chitinous template of poriferan origin. The specific thermal stability of the nanostructured chitinous template allowed for the formation under hydrothermal conditions of a novel germanium oxide- chitin composite with a defined nanoscale structure. Using a variety of analytical techniques （FTIR, Raman, energy dispersive X-ray （EDX）, near-edge X-ray absorption fine structure （NEXAFS）, and photoluminescence （PL） spectroscopy, EDS-mapping, selected area for the electron diffraction pattern （SAEDP）, and transmission electron microscopy （TEM））, we showed that this bioorganic scaffold induces the growth of GeO2 nanocrystals with a narrow （150-300 nm） size distri- bution and predominantly hexagonal phase, demonstrating the chitin template＇s control over the crystal morphology. The formed GeO2-chitin composite showed several specific physical properties, such as a striking enhancement in photo- luminescence exceeding values previously reported in GeOR-based biomaterials. These data demonstrate the potential of extreme biomimetics for developing new-generation nanostructured materials.

关键词： extreme biomimetics, chitin-GeO2 photoluminescence, near-edge X-ray absorption fine structure (NEXAFS) spectroscopy

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Hydrogen production from methane and carbon dioxide mixture using all-solid-state electrochemical cell based on a proton-conducting membrane and redox-robust composite electrodes

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Journal of Energy Chemistry 2022年第6期31卷 576-584,I0016页

作者： denis Osinkin Evgeniy Tropin Laboratory of Solid Oxide Fuel Cells Institute of High-Temperature ElectrochemistryYekaterinburg 620137Russian Federation School of Economics and Management Department of Environmental EconomicsUral Federal UniversityYekaterinburg 620002Russian Federation Laboratory of Solid State Chemistry Institute of Solid State Chemistry and MechanochemistryNovosibirsk 630128Russian Federation

In recent years, interest in hydrogen as a fuel has sharply increased in the field of alternative and green energy due to its high energy capability and zero-emission behaviour. As a result, research in the development of new highly efficient methods for producing high-purity hydrogen is relevant. This paper presents, for the first time, the test results of an electrochemical cell with a proton-conducting La_(0.9)Sr_(0.1)ScO_(3-δ) electrolyte and symmetrical Sr_(1.95)Fe_(1.4)Ni_(0.1)Mo_(0.5)O_(6-δ)+ La_(0.9)Sr_(0.1)Sc_(0.9)Co_(0.1)O_(3-δ) electrodes as a hybrid setup for electricity generation in proton ceramic fuel cell mode, for hydrogen separation from H_(2)+ Ar mixture and the production of high-purity hydrogen from methane with simultaneous CO_(2) *** was found that this electrochemical cell generates high flow rates of hydrogen during its separation through a proton-conducting membrane from H_(2)+ Ar mixture, about 500 cm^(3)h^(-1)cm^(-2)at a current density of 0.6 A cm^(-2)as well as about 370 cm^(3) h^(-1)cm^(-2)at a current density of 0.5 A cm^(-2) from CH_(4)+ CO_(2) mixture at 800 ℃ which shows that these cells are promising for hydrogen production.

关键词： Protonic ceramic fuel cell Hydrogen production Symmetrical electrodes Sr_(2)Fe_(1.5)Mo_(0.5)O_(6–δ) CO_(2)utilization

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DGPS/INS Data Fusion for Land Navigation

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Journal of Donghua University(English Edition) 2004年第3期21卷 88-93页

作者： denis Berdjag denis Pomorski L.A.G.I.S. UMR 8021 B timent P2 Cité ScientifiqueUniversité des Sciences et Technologies de Lille 59655 Villeneuve d' Ascq cedex FranceL.A.G.I.S. UMR 8021 B timent P2 Cité ScientifiqueUniversité des Sciences et Technologies de Lille 59655 Villeneuve d' Ascq cedex France

The interest for land navigation has increased for the recent years. With the advent of the Global Position System (GPS) we have now the ability to determine the absolute position anywhere on the globe. The problem is that the GPS systems work well only in open environments with no overhead obstructions and they are subject to large unavoidable errors when the reception from some of the satellites are blocked. This occurs frequently in urban environments, forests and tunnels. GPS systems require at least four “visible” satellites to maintain a good position fix. In many situations in which higher level of accuracy is required, the navigation cannot be achieved by GPS alone. This paper discusses the design of a reliable multisensor fusion algorithm using GPS and Inertial Navigation System in order to decrease the implementation cost of such systems on land vehicles. The major contribution of this paper is in the definition of the possible developments and research axes in land navigation.

关键词： Data fusion inertial navigation system (INS) GPS system Kalman filter informational filter

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Preliminary study of mollusk fossils in the Qinan Miocene loess-soil sequence in western Chinese Loess Plateau

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Science China Earth Sciences 2006年第7期49卷 724-730页

作者： denis-Didier Rousseau Université Montpellier II Institut des Sciences de l’Evolution (UMR CNRS 5554) Case 61 Place E. Bataillon 34095 Mont-pellier Cedex 05 France Lamont-Doherty Earth Observatory of Columbia University Palisades New York 10964 USA

The first near continuous mollusk fossil record from the Qinan Miocene loess-soil se-quence is presented. Results show that mollusk species are abundant in the QA-I section between 22 and 6.2 Ma, and both loess layers and soil layers yield mollusk fossil individuals. All mollusk species are terrestrial and well preserved in the section. Most species are identical to those identified in the Quaternary loess-soil sequence of the Loess Plateau. The thermo-humidiphilous group generally is distributed in soil layers, whereas cold-aridiphilous group can be observed in loess layers. From the Miocene to Quaternary, the occurrence and divergence of new species of Metodontia and Cathaica correspond to the crucial periods of regional and global environmental changes, indicating that mol-lusk species are sensitive to environmental variations. Preliminary study on the QA-I mollusk record indicates that the Qinan Miocene loess-soil sequence may have a similar sedimentary environment to the Quaternary loess-soil sequence of the Loess Plateau.

关键词： mollusk fossils, Miocene loess, Loess Plateau, mollusk evolution, sedimentary environment.

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Ethnopharmacological Potentials of Warburgia ugandensis on Antimicrobial Activities

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Chinese Journal of Integrative Medicine 2021年第8期27卷 633-640页

作者： denis Okello Youngmin Kang Korean Convergence Medicine Major University of Science and TechnologyDaejeonRepublic of Korea Gombe Secondary School P.O.Box 192Butambala/MpigiUganda Herbal Medicine Research Division Korea Institute of Oriental MedicineDaejeon34054Republic of Korea

Warburgia ugandensis(***)is known by various names,including the East African greenheart,pepper bark tree,and Ugandan greenheart,and has a rich history of extensive use in the treatment of a host of human diseases in many African *** review is based on the botany and ethnopharmacological potentials of *** for the treatment of pneumonia,asthma,malaria,candidiasis,skin infections,human immunodeficiency virus opportunistic infections,diarrhea,and measles given the common use in the management of these *** from *** have strong antimicrobial activities against a broad spectrum of pathogens mainly because of the presence of abundant terpenoids,drimane,and coloratane type sesquditerpenoids amongst which are ugandensial,warburganal,mukaadial,and other secondary metabolites,such as tannins,flavonoids,saponins,steroids,and *** group of compounds gives the plant a high therapeutic *** on the review,there is a need for identification and isolation of the highly therapeutic phytochemical constituents and a drive for more preclinical and clinical trials to validate the safety and efficacy of the *** gives basis for the potential development of new therapeutic drugs from the plant.

关键词： Ethnopharmacological potential Warburgia ugandensis greenheart pharmacological activity review

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Edge and lithium concentration effects on intercalation kinetics for graphite anodes

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Journal of Energy Chemistry 2024年第3期90卷 337-347,I0009页

作者： Keming Zhu denis Kramer Chao Peng School of Mechanical and Precision Instrument Engineering Xi'an University of TechnologyXi'an 710048ShanxiChina Faculty of Mechanical Engineering Helmut-Schmidt UniversityHamburg 22043Germany School of Engineering University of SouthamptonSouthampton SO171BJUK Multiscale Crystal Materials Research Center Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055GuangdongChina

Graphite interfaces are an important part of the anode in lithium-ion batteries(LIBs),significantly influencing Li intercalation *** anodes adopt different stacking sequences depending on the concentration of the intercalated Li *** this work,we performed first-principles calculations to comprehensively address the energetics and dynamics of Li intercalation and Li vacancy diffusion near the no n-basal edges of graphite,namely the armchair and zigzag-edges,at high Li *** find that surface effects persist in stage-Ⅱ that bind Li strongly at the edge ***,the pronounced effect previously identified at the zigzag edge of pristine graphite is reduced in LiC_(12),penetrating only to the subsurface site,and eventually disappearing in LiC_(6).Consequently,the distinctive surface state at the zigzag edge significantly impacts and restrains the charging rate at the initial lithiation of graphite anodes,whilst diminishes with an increasing degree of *** diffusion time for Li hopping to the bulk site from either the zigzag edge or the armchair edge in LiC_(6) was observed during high state of charge due to charge *** controlling Li occupation and diffusion kinetics at this stage is also crucial for enhancing the charge rate.

关键词： Graphite anode Edge Interface Lithium-ion batteries Density functional theory

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Statistical Estimation of the Shannon Entropy

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Acta Mathematica Sinica,English Series 2019年第1期35卷 17-46页

作者： Alexander BULINSKI denis DIMITROV Steklov Mathematical Institute of Russian Academy of Sciences and Department of Mathematics and Mechanics Lomonosov Moscow State UniversityMoscow 119234Russia

The behavior of the Kozachenko–Leonenko estimates for the(differential) Shannon entropy is studied when the number of i.i.d. vector-valued observations tends to infinity. The asymptotic unbiasedness and L^2-consistency of the estimates are established. The conditions employed involve the analogues of the Hardy–Littlewood maximal function. It is shown that the results are valid in particular for the entropy estimation of any nondegenerate Gaussian vector.

关键词： Shannon differential entropy Kozachenko-Leonenko estimates Hardy-Littlewood maxi-mal function analogues asymptotic unbiasedness and L^2-consistency Gaussian vectors

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Vespa velutina nest distribution at a local scale： An 8-year survey of the invasive honeybee predator

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Insect Science 2017年第4期24卷 663-674页

作者： Karine Monceau denis Thiery INRA UMR 1065 Sante et Agroecologie du Vignoble Bordeaux Sciences Agro ISVV F-33883 Villenave d'Omon Cedex France

Vespa velutina is an invasive species that was observed for the first time in France and Europe in 2004, which rapidly threatened domestic honeybees with active predation. For the first time in this study, we analyzed the distribution of V. velutina nests at a local scale to understand the pattern of nesting, and in 8 years of monitoring, a total of 528 nests were surveyed. With the exception of 2 years, the nests of V. velutina were randomly distributed within the monitored area, which suggested that intraspecific competition for nesting sites and/or food was unlikely. When the data for all years were combined, an aggregated distribution of nests at the seafront in the vicinity of the oyster farm and sportfishing activities was observed. This distribution suggested that seafood, attractive to vespids, might provide a valuable alternative food source that favored colony development. We also tested the effect of spring queen trapping of V. velutina on the distribution of nests in 2014, which was the year with the greatest number of colonies within the area; the position of the traps did not influence the distribution of the nests. For the first time, this study showed that （i） intraspecific competition was unlikely to be a mechanism for population regulation, （ii） some areas were more likely favored for hornet nests, and （iii） spring queen wasp trapping was inefficient as a method to limit the distribution of the V. velutina population.

关键词： intraspecific competition nesting habits spring queen trapping yellow-legged hornet

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Turned Trochoidal Disturbance on a Liquid Jet Surface

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Chinese Journal of Mechanical Engineering 2014年第4期27卷 846-852页

作者： SADIK Shalom KIRZHNER Felix KRAMARENKO denis Department of Mechanical Engineering ORT Braude College Division of Environmental Water and Agricultural Engineering Faculty of Civil and Environmental EngineeringTechnion-IIT Haifa 32000 Israel Biotechnology Engineering ORT Braude College

This paper shows that a turned trochoidal function disturbance may lead to peripheral drops production. The resulting model is used to describe that a turned trochoidal disturbance leads to peripheral drops production on the liquid jet surface without the necessity for superimposed disturbances. The trochoid is a non-unique parametric function. Only non-unique parametric functions disturbances may lead to peripheral drops production. The trochoidal function disturbance is decomposed to Fourier series. Every Fourier element receives an amplification factor in accordance to the Rayleigh inviscid jet model. Peripheral drops are received on the jet surface. The paper shows that all trochoidal disturbance functions, prolate cycloid, cycloid and curtate cycloid have a capability of peripheral drops producing. A limited capability of peripheral drops production is introduced for the trochoidal curtate cycloid. Produced drops size are reduced for increasing the jet velocity and wave number. Smaller drops are also received by transition from the prolate cycloid to curtate cycloid disturbance.

关键词： drops liquid jet trochoidal function

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The peculiar case of the “double-humped” super-luminous supernova SN 2006oz

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Research in Astronomy and Astrophysics 2013年第10期13卷 1202-1206页

作者： Rachid Ouyed denis Leahy Department of Physics and Astronomy University of Calgary 2500 University Drive NWCalgaryAlberta T2N 1N4 Canada

SN 2006oz is a super-luminous supernova with a mysterious bright precursor that has resisted explanation in standard ***,such a precursor has been predicted in the dual-shock quark nova model of super-luminous supernovae–the precursor is the supernova event while the main light curve of the super-luminous supernova is powered by the Quark-Nova（explosive transition of the neutron star to a quark star）.As the supernova is fading,the Quark-Nova re-energizes the supernova ejecta,producing a＂double-humped＂light *** show that the quark nova model successfully reproduces the observed light curve of SN 2006oz.

关键词： supernovae:general supernovae:individual(SN 2006oz

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