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Carbon coating of air-sensitive insulating transition metal fluorides:An example study on α-Li3FeF6 high-performance cathode for lithium ion batteries

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Journal of Materials Science & Technology 2020年第20期52卷 107-115页

作者： anna basa Sławomir Wojtulewski Beata Kalska-Szostko Maciej Perkowski Elena Gonzalo Olga Chernyayeva Alois Kuhn Flaviano García-Alvarado Institute of Chemistry University of Bialystokul.K.Ciolkowskiego 1K15-245 BialystokPoland Departamento de Química y Bioquímica Facultad de FarmaciaUniversidad CEU San Pablo28668 Boadilla del MonteMadridSpain Polish Institute of Physical Chemistry Kasprzaka St.44/5201-224 WarsawPoland CIC Energigune Parque Tecnologico de Alava01510 MinanoAlavaSpain

Li_(3)FeF_(6)has been the focus of research of fluorine-based cathode materials for lithium-ion *** of the low electronic conductivity of Li3 FeF6,the decrease of particle size,by an energyconsuming long-time ball milling process with carbon,is necessary to achieve a high electrochemical *** most successful method to enhance electrochemical activity,carbon coating,seemed to be impracticable,so far,for sensitive fluorides like Li3 *** this work,carbon coating on Li3 FeF6 particles has been successfully achieved for the first time,while avoiding both extended hydrolysis and Fe(Ⅲ)-Fe(Ⅱ)*** heat treatment and atmosphere,yielding the maximal transformation of organic carbon to both graphitised and disordered carbon,has been *** coating,with a thickness of approximately 2.5 nm,has been achieved by controlled thermal decomposition of glucose,under air,at 300℃.Raman and X-ray photoelectron spectroscopy(XPS)experiments have proved the existence of carbon and Fe2O3 on the surface of Li3FeF6 *** spectroscopy indicates the presence of organic residues from glucose *** to further reduce the orga nic carbon content results in a decrease of the amorphous carbon coating *** carbon-coated Li3 FeF6 nanoparticles deliver 122 mA h g^(-1)(85%of theoretical capacity)significantly higher than that of a noncoated sample(58 mA h g^(-1)).Even more,a significant beneficial effect of carbon coating on both capacity retention and coulombic efficiency is observed.

关键词： Lithium iron fluoride Hydrolysable fluoride Lithium battery Cathode Carbon coating

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An exsitu underground coal gasification experiment with a siderite interlayer:course of the process,production gas,temperatures and energy efficiency

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International Journal of Coal Science & Technology 2021年第6期8卷 1447-1460页

作者： Marian Wiatowski Krzysztof Kapusta Jacek Nowak Marcin Szyja Wioleta basa Główny Instytut Górnictwa(Central Mining Institute) Plac Gwarków 140-166 KatowicePoland Politechnika Slaska Katedra Geologii Stosowanej(Institute of Applied GeologySilesian Technical University)ul.Akademicka 2AGliwicePoland

A 72-h ex situ hard coal gasification test in one large block of coal was carried *** gasifying agent was oxygen with a constant flow rate of 4.5 m^(3)/*** surroundings of coal were simulated with wet sand with 11%moisture content.A 2-cm interlayer of siderite was placed in the horizontal cut of the coal *** a result of this process,gas with an average flow rate of 12.46 m^(3)/h was *** direct influence of siderite on the gasification process was observed;however,measurements of CO_(2)content in the siderite interlayer before and after the process allow to determine the location of high-temperature zones in the *** greatest influence on the efficiency of the gasification process was exerted by water contained in wet *** the high temperature that prevailed in the reactor,this water evaporated and reacted with the incandescent coal,producing hydrogen and carbon *** reaction contributes to the relatively high calorific value of the resulting process gas,averaging 9.41 MJ/kmol,and to the high energy efficiency of the whole gasification process,which amounts to approximately 70%.

关键词： Underground coal gasification UCG Siderite interlayer Water Ex situ Hydrogen

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Nanocomposite egg shell powder with in situ generated silver nanoparticles using inherent collagen as reducing agent

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Journal of Bioresources and Bioproducts 2020年第2期5卷 101-107页

作者： Krittirash Yorseng Suchart Siengchin basa Ashok Anumakonda Varada Rajulu Department of Mechanical and Process Engineering The Sirindhorn International Thai-German Graduate School of Engineering(TGGS)King Mongkut’s University of Technology North BangkokBangkok 10800Thailand Department of Physics University College of EngineeringOsmania UniversityHyderabad 500007India International Research Centre Kalasalingam UniversityKrishnan Kovil 626126India Natural Composite Research Group King Mongkut’s University of Technology North BangkokBangkok 10800Thailand

Silver nanoparticles(AgNPs)were in situ generated in poultry hen egg shell powder(ESP)by one step thermal assisted method using the inherently present collagen as a reducing *** nanocomposite egg shell powder(NCESP)with in situ generated silver nanoparticles was charac-terized by scanning electron microscopy(SEM),Fourier transform infrared(FT-IR)spectroscopy,X-ray diffraction(XRD),thermogravimetric analysis(TGA)and antibacterial *** prepared NCESP had the spherical AgNPs in the size range of 50-120 nm with most of them from 81 nm to 90 ***,the average size of the AgNPs generated in the NCESP was 88 *** X-ray analysis indicated the presence of both AgNPs and AgO nanoparticles(AgONPs)in the *** possible mechanism of generation of AgNPs and AgONPs in the NCESP was also *** thermal stability of the NCESP was found to be higher than that of the *** NCESP ex-hibited excellent antibacterial activity against both the Gram negative and positive *** NCESP made from poultry waste ESP can be utilized as a low-cost antibacterial cleaning powder for house ware and also as low-cost antibacterial filler in polymer matrices to make antibacterial hybrid nanocomposites.

关键词： Nanocomposite In situ generation Silver nanoparticle Thermal stability Antibacterial activity

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Supercritical carbon dioxide extraction of Triognella foenum graecum Linn seeds:Determination of bioactive compounds and pharmacological analysis

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Asian Pacific Journal of Tropical Biomedicine 2017年第12期7卷 1085-1091页

作者： Ola basa’ar Samreen Fatema Ali Alrabie Mohammed Mohsin Mazahar Farooqui Department of Chemistry Hodeidah University Post Graduate & Research Center Maulana Azad College Dr.Rafiq Zakaria College for women

Objective: To investigate the effect of temperature and pressure on supercritical CO_2 extraction of Triognella foenum graecum Linn seeds, to determine the optimal condition which leads to highest percentage of the accumulative yield and revealing the chemical composition of supercritical CO_2 ***: Temperatures in the range of 40–60C and pressures in the range of 10–25 MPa were used. FTIR and GC–MS analysis were used to detect the bioactive compounds present in the extract. The broth dilution method and slope method were used to evaluate the anti-microbial and anti-tuberculosis activities and the in vitro anti-malarial assay was carried out according to the micro assay protocol of Rieckmann and his ***: The temperature was more affected than the pressure on the extraction performance and the highest yield of the extract(3.111%) was attained at 60C and 10 *** and GC–MS showed that the chemical composition of the extract included conjugated linoleic acid methyl ester as the major active principle(with concentration of72.28%), followed by saturated fatty acid methyl esters(16.03%), steroids(8.09%) and organic siloxane compound(3.61%). The extract showed moderate anti-bacterial activity with MIC values 100, 250, 125 mg/m L towards Escherichia coli, Staphylococcus aureus and Streptococcus pyogenus respectively. It exhibited high inhibition effect towards the fungi Candida albican with MFC value(250 mg/m L). The extract had low antituberculosis activity with MIC value(100 mg/m L) and comparable MIC value(0.29 mg/m L) towards Plasmodium ***: Supercritical CO_2 extraction as alternate and green technology is performed successfully to extract the bioactive compounds from the seeds of T. foenum graecum Linn and it is concluded that this extract can be used as an alternate source of synthetic anti-biotic drugs.

关键词： Anti-bacterial Anti-fungal Anti-malarial Anti-tuberculosis Sc–CO2 extraction Triognella foenum graecum Linn

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Cyclicity of the Lower Buntsandstein in the eastern part of the Central European Basin:implications for Early Triassic palaeogeography and for geochronological calibration

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Journal of Palaeogeography 2024年第2期13卷 252-292页

作者： anna Becker Polish Geological Institute-National Research Institute 4 Rakowiecka str.00-975 WarsawPoland

Lower Buntsandstein small—scale cycles recognized in the Central European Basin(CEB) are readily used for astrochronological calibration of the Early Triassic time scales,although they are not well studied *** borehole sections from the eastern part of the CEB,forming a south-north transect perpendicular to the basin axis,were studied in terms to better understand the depositional history of the Lower Buntsandstein developed as the Baltic Formation in the studied Polish part of the *** sedimentary facies were recognized,based on lithological and sedimentological investigations of 655.7 m of drill cores from the Otyń IG 1,Gorzów Wielkopolski IG 1 and Kamień Pomorski IG 1 *** facies can be grouped according to a lithological criterion into facies of predominantly siliciclastic lithology(including 9facies types) and facies of predominantly carbonate lithology(including 2 facies types).Facies analysis allowed to distinguish 8 facies associations of:1) alluvial fan,2) playa,3) sandy-muddy coastal plain,4)embayment and distal delta,5) lagoon,6) sand bars or shoals,7) ooidal shoals or bars,and 8) ***-upward(DC) and shallowing-upward(SC) sedimentary cycles were recognized in parts of the Baltic Formation,with DCs dominating in the southernmost located Otyń IG 1,and SCs dominating in Gorz ow Wielkopolski IG 1,located in the axial part of the *** cycles are very *** statistical significance of the sedimentary cycles is relatively low according to Markov-chain analysis conducted with the phpSedistat software of Stanova et al.(2009).Analysis of small—scale cycles performed on well logs of investigated boreholes and additional boreholes in the vicinity of Otyń IG 1,implementing the earlier study of Becker(2005),showed that the correlation of well-log cycles(GR cycles) and sedimentary cycles is not *** cycles can be roughly correlated with lithological carbonate—siliciclastic cycles(c-s cycles),refle

关键词： Triassic Lower Buntsandstein Cyclicity Central European Basin

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Cornea modelling

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Eye and Vision 2020年第1期7卷 11-25页

作者： anna Pandolfi Department of Civil and Environmental Engineering Politecnico di MilanoPiazza Leonardo da Vinci 3220133 MilanoItaly

Background:Biomechanics introduces numerous technologies to support clinical practice in ophthalmology,with the goal of improving surgical outcomes and to develop new advanced technologies with minimum impact on clinical ***,a few misconceptions on the way that computational methods should be applied to living tissues contributes to a lack of confidence towards computer-based ***:Corneal biomechanics relies on sound theories of mechanics,including concepts of equilibrium,geometrical measurements,and complex material *** peculiarities of biological tissues require the consideration of multi-physics,typical of the eye environment,and to adopt customized geometrical models constructed on the basis of advanced optical imaging and in-vivo ***:Patient-specific models are able to predict the outcomes of refractive surgery and to exploit the results of in-vivo test to characterize the material properties of the corneal ***:Corneal biomechanics can become an important support to clinical practice,provided that methods are based on the actual multi-physics and use customized geometrical and mechanical models.

关键词： Corneal biomechanics Physiologic configuration Tonometry modelling Refractive surgery modelling

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Joint power and spectrum allocation algorithm in cognitive radio networks

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Journal of Systems Engineering and Electronics 2011年第4期22卷 691-701页

作者： anna Auguste Anghuwo Communication Research Center Harbin Institute of Technology

The spectrum sharing problem between primary and cognitive users is mainly investigated. Since the interference for primary users and the total power for cognitive users are constrained, based on the well-known water-filling theorem, a novel one-user water-filling algorithm is proposed, and then the corresponding simulation results are given to analyze the feasibility and validity. After that this algorithm is used to solve the communication utility optimization problem subject to the power constraints in cognitive radio network. First, through the gain to noise ratio for cognitive users, a subcarrier and power allocation algorithm based on the optimal frequency partition is proposed for two cognitive users. Then the spectrum sharing algorithm is extended to multiuser conditions such that the greedy and parallel algorithms are proposed for spectrum sharing. Theory and simulation analysis show that the subcarrier and power allocation algorithms can not only protect the primary users but also effectively solve the spectrum and power allocation problem for cognitive users.

关键词： cognitive radio spectrum sharing water-filling algo-rithm interference constraint communication overhead.

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Plasma-assisted oxidation of benzoic acid

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Frontiers of Chemical Science and Engineering 2020年第4期14卷 513-521页

作者： anna Khlyustova Nikolay Sirotkin Laboratory of Chemistry of Hybrid Nanomaterials and Supermolecular Systems G.A.Krestov Institute of Solution Chemitry of Russian Academy of SciencesIvanovo 153045Russia

Plasma-assisted oxidation of organic com-pounds is one of the developing technologies for wastewater *** effectively accelerate degradation processes due to plasma generated reactive species and ultra-violet *** of BA in aqueous solutions by the atmospheric pressure glow discharge and underwater diaphragm discharge was studied and monitored by fluorescence and spectrophoto-metric *** type and solution pH affect the formation rates of mono-and dihydroxybenzoic *** derivatives were formed only by glow discharge *** yields of hydroxyl radical were estimated on the kinetics data for the hydroxylation of benzoic *** steps of the hydroxylation processes and further oxidation were described.

关键词： atmospheric pressure glow discharge under-water diaphragm discharge oxidation benzoic acid hydroxyl radical

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Each coin has 2 sides: a positive role of alien Potamopyrgus antipodarum (Grey, 1843) snails in reducing the infection of native lymnaeids with trematodes

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Current Zoology 2024年第2期70卷 262-269页

作者： anna Cichy anna Stanicka Elzbieta Zbikowska Faculty of Biological and Veterinary Sciences Nicolaus Copernicus University in TorunLwowska 187-100 TorunPoland

The change in the distribution of organisms in freshwater ecosystems due to natural or manmade processes raises the question of the impact of alien species on local *** most studies indicate a negative effect,the positive one is more difficult to discern,espe-cially in multispecies systems,including hosts and *** purpose of the study was to check whether the presence of an alien host,Potamopyrgus antipodarum,reduces the intensity of Echinoparyphium aconiatum metacercariae in a native host,Radix *** additionally tested the impact of water temperature and the biomass of the alien host on the dilution *** experimentally studied(1)the lifespan of echinostome cercariae in different temperatures,(2)the infectivity of cercariae toward the alien host and native host,and(3)the impact of different biomass of the alien host on the intensity of metacercariae in the native *** found that cercarial survival and infectivity were tem-perature ***,cercarial survival decreased with increasing temperature,contrary to cercarial *** cercariae entered the renal cavity of both the native host and alien host,and successfully transformed into *** number of metacercariae in the native host decreased with the increasing biomass of the alien *** results indicate that lymnaeids may benefit from the co-occur-rence with P antipodarum,as the presence of additional hosts of different origins may reduce the prevalence of parasites in native ***,the scale of the dilution effect depends not only on the increased spectrum of susceptible hosts but also on the other variables of the environment,including water temperature and host density.

关键词： biological invasion density dilution effect echinostomes Radix spp. temperature.

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Regulation of Meristem Size by Cytokinin Signaling

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Journal of Integrative Plant Biology 2011年第6期53卷 446-454页

作者： anna Skylar Molecular and Computational Biology University of Southern CaliforniaLos AngelesCA

The plant meristems possess unique features that involve maintaining the stem cell populations while providing cells for continued development. Although both the primary shoot apical meristem （SAM） and the root apical meristem （RAM） are specified during embryogenesis, post-embryonic tissue proliferation is required for their full establishment and maintenance throughout a plants＇ life. The phytohormone cytokinin （CK） interacts with other systemic signals and is a key regulator of meristem size and functions. The SAM and the RAM respond to CK stimulations in different manners： CK promotes tissue proliferation in the SAM through pathways dominated by homeobox transcription factors, including the class I KNOX genes, ST^P, and WUS; and curiously, it favors proliferation at low levels and differentiation at a slightly higher concentration in the RAM instead. Here we review the current understanding of the molecular mechanisms underlying CK actions in regulating meristematic tissue proliferation.

关键词： cytokinin signaling meristem tissue proliferation.

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