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microstructure， electrochemical， wear and corrosive wear performance of laser-based powder bed fusion(lpbf) and wrought biomedical Ti-6Al-4v alloys

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Transactions of nonferrous metals Society of China 2024年

作者： A.g.Lekatou B.v.Efremenko v.Haoui v.g.Efremenko S.Emmanouilidou v.i.Zurnadzhy i.Petryshynets Yu.g.Chabak i.i.Sili Laboratory of Applied metallurgy Department of materials Science and Engineering School of Engineering University of ioannina institute of materials Science and Computing University Research Center of ioannina (URCi) Pryazovskyi State Technical University Department of Physics institute of materials Research of Slovak Academy of Sciences

Wrought and laser powder bed fusion （LPBf） Ti-6Al-4v specimens were comparatively evaluated， with the objective to determine LPBf Ti-6-4’s suitability for biomedical applications. Testing included nanoindentation， cyclic polarization in simulated body fluid （SBf， 37 ℃ ）， and dry and SBf “Ball-on-Plate” sliding. Wrought Ti-6-4 exhibited a lamellar （α+β） microstructure， whereas LPBf displayed a fine-grained α'-martensite microstructure. LPBf Ti-6-4 demonstrated ～3% higher indentation modulus and ～32% higher hardness， while wrought Ti-6-4 showed ～8% higher plasticity. Both alloys exhibited low corrosion rates (10–5mA/cm2order) and true passivity (10–4mA/cm2order). no localized corrosion was observed in either alloy， except for occasional metastable pitting in the LPBf alloy. However， LPBf Ti-6-4 presented higher corrosion rate and passive current， ascribed to its martensitic structure. During dry sliding， LPBf Ti-6-4 exhibited ～14% lower volume loss compared to wrought Ti-6-4. Sliding in SBf increased volume losses for both alloys， with wear resistances nearly equalized， as the advantage of LPBf Ti-6-4 decreased due to more intensive wear-accelerated corrosion induced by the stressed martensite. overall， the results demonstrate the suitability of LPBf Ti-6Al-4v for biomedical uses.

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Antibacterial HA-coatings on bioresorbable mg alloy

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journal of magnesium and Alloys 2024年第5期12卷 1965-1985页

作者： K.v.nadaraia D.v.mashtalyar m.A.Piatkova A.i.Pleshkova i.m.imshinetskiy m.S.gerasimenko E.A.Belov v.v.Kumeiko D.n.Kozyrev K.A.fomenko v.v.mostovaya B.R.Torpanov A.R.Biktimirov i.S.osmushko S.L.Sinebryukhov S.v.gnedenkov institute of Chemistry fEB RAS 159 Pr.100-letiya VladivostokaVladivostok 690022Russia far Eastern federal University 10 Ajax BayRussky IslandVladivostok 690922Russia A.v.Zhirmunsky national Scientific Center of marine Biology fEB RAS 17 St.PalchevskogoVladivostok 690041Russia Regional Clinical Dermatovenerological Dispensary 18 V St.GamarnikaVladivostok 690033Russia nmiC“Treatment and Rehabilitation Center” 3 Ivankovskoe highwayMoscow 125367Russia

in this study,a calcium-phosphate coating was formed on a mg-mn-Ce alloy by the plasma electrolytic oxidation(PEo).The antibiotic vancomycin,widely used in the treatment of infections caused by Staphylococcus aureus(***),was impregnated into the *** with vancomycin showed high bactericidal activity against *** mechanical and electrochemical properties of the formed coatings were studied,as well as in vitro cytotoxicity tests and in vivo tests on mature male rats were *** to SEm,EDS,XRD and XPS data,coatings had a developed morphology and contained hydroxyapatite,which indicates high *** analysis of roughness of coatings without and with vancomycin did not reveal any differences,confirming the high roughness of the *** electrochemical tests,an increase in corrosion resistance by more than two times after the application of PEo coatings was *** to the results of an in vivo study,after 28 days of the implantation of samples with calcium phosphate PEo coating and vancomycin,no signs of inflammation were observed,while an inflammatory reaction developed in the area of implantation of bare alloy,followed by *** release tests from the coatings show a sharp decrease in the concentration of the released antibiotic on day 7 and then a gradual decrease until day *** the experiment,no significant deviations in the condition and behavior of the animals were observed;clinical tests did not reveal a systemic toxic reaction.

关键词： Bioactive coatings Biocompatibility mg alloy Plasma electrolytic oxidation Hydroxyapatite vancomycin

Effect of Ta_(2)o_(5)nanoparticles on bioactivity,composition,structure,in vitro and in vivo behavior of PEo coatings on mg-alloy

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journal of magnesium and Alloys 2024年第6期12卷 2360-2379页

作者： D.v.mashtalyar i.m.imshinetskiy v.v.Kashepa K.v.nadaraia m.A.Piatkova A.i.Pleshkova K.A.fomenko A.Yu.Ustinov S.L.Sinebryukhov S.v.gnedenkov institute of Chemistry Far Eastern BranchRussian Academy of SciencesVladivostok690022Russia far Eastern federal University Vladivostok690950Russia Regional Clinical Dermatovenerological Dispensary Vladivostok690033Russia

The present study investigates the physical and chemical characteristics,behavior in vitro and in vivo,and biocompatibility of coatings containing Ta_(2)o_(5),which are obtained by plasma electrolytic oxidation(PEo)on mA8 magnesium *** obtained coatings demonstrate in vivo biocompatibility and in vitro *** to the base PEo coating,the layers containing Ta_(2)o_(5)facilitate the development of apatite in simulated body fluid,suggesting that the inclusion of nanoparticles improves bioactivity of the *** was found that incorporation of Ta_(2)o_(5)nanoparticles increases roughness and porosity of the formed layers by increasing particle concentration in electrolytes for the PEo process contributing to sufficient soft tissue ingrowth in *** on in vivo studies,these coatings also provide favorable tissue response and minimal inflammatory reaction in comparison with the bare magnesium alloy due to protection of living tissues from deleterious corrosion events of magnesium implant such as local alkalization and intense hydrogen *** results obtained in the present study concluded biocompatibility,tissue integration of the PEo coatings containing Ta_(2)o_(5)nanoparticles making them a promising protective layer for biodegradable magnesium implants.

关键词： Plasma electrolytic oxidation Bioactive coatings Tantalum pentoxide Simulated body fluid(SBf) Apatite formation Histology

nanomotion of bacteria to determine metabolic profile

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nanotechnology and Precision Engineering 2024年第1期7卷 1-9页

作者： S.n.Pleskova E.v.Lazarenko n.A.Bezrukov R.n.Kriukov A.v.Boryakov m.E.Dokukin S.i.Surodin Research Laboratory of Scanning Probe microscopy Lobachevsky State University of Nizhny NovgorodNizhny Novgorod 603950Russia Department of nanotechnology and Biotechnology Nizhny Novgorod State Technical University n.a.R.E.AlekseevNizhny Novgorod 603950Russia Sarov Physics and Technology institute National Research Nuclear University MEPhISarov 607186Russia

in addition to their visible motion such as swimming(e.g.,with the help ofﬂagella),bacteria can also exhibit nanomotion that is detectable only with highly sensitive instruments,and this study shows that it is possible to detect bacterial nanomotion using an Afm detection *** results show that the nanomotion characteristics depend on the bacterial strain,and that nanomotion can be used to sense the metabolic activity of bacteria because the oscillations are sensitive to the food preferences of the bacteria and the type of surrounding medium.

关键词： nanomotion Bacteria Cantilever oscillation Atomic force microscopy metabolism

numerical Simulation of Thermocapillary Convection with Evaporation induced by Boundary Heating

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fluid Dynamics & materials Processing 2024年第7期20卷 1667-1686页

作者： o.n.goncharova v.B.Bekezhanova Altai State University Institute of Mathematics and Information TechnologiesBarnaul656049Russia institute of Computational modelling SB RAS Department of Differential Equations of MechanicsKrasnoyarsk660036Russia

The dynamics of a bilayer system filling a rectangular cuvette subjected to external heating is *** influence of two types of thermal exposure on the flow pattern and on the dynamic contact angle is *** particular,the cases of local heating from below and distributed thermal load from the lateral walls are *** simulation is carried out within the frame of a two-sided evaporative convection model based on the Boussinesq approximation.A benzine–air system is considered as reference *** variation in time of the contact angle is described for both heating *** lateral heating,near-wall boundary layers emerge together with strong convection,whereas the local thermal load from the lower wall results in the formation of multicellular motion in the entire volume of the fluids and the appearance of transition regimes followed by a steady-state *** results of the present study can aid the design of equipment for thermal coating or drying and the development of methods for the formation of patterns with required structure and morphology.

关键词： Thermocapillary convection two-phase system numerical modeling contact angle

Design of Biologically Active macromolecular Ligands and Their Luminescent Complexes with Terbium ions

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Chinese journal of Polymer Science 2024年第5期42卷 604-611,I0007页

作者： Tatiana n.nekrasova Andrei i.fischer natalia A.nesterova Anatoliy v.Dobrodumov Anzhelika v.garshinina olga D.Shuvaeva natalya v.Zakharova Evgenii f.Panarin institute of macromolecular Compounds Russian Academy of Sciences31 Bolshoy pr.St Petersburg199004Russia Smorodintsev Research institute of influenza Russian Ministry of Health15/17 ul.prof.PopovaSt Petersburg197376Russia

Water-soluble copolymers of p-methacrylamidobenzoic acid(mABA)with neutral comonomers(n-vinylpyrrolidone(vP),n-methyl-n-vinylacetamide(mvAA),n-methacryloyl glucosamine(mAg))and anionic comononer sodium styrene sulfonate(naSS)were synthesized by radical *** interactions between the prepared copolymers and Tb^(3+)ions in aqueous solutions were studied;the significant influence of chemical structure of a comonomer on luminescence intensity of Tb^(3+)complexes with the copolymers was *** luminescence intensity of Tb^(3+)complexes with the copolymers containing n-vinylamide units(vP,mvAA)is three times more intense than that observed for the complexes between Tb^(3+)and mAg-containing *** the case of naSS-containing copolymers,the luminescence intensity is controlled by the values of binding constants between Tb^(3+)and mABA and the content of mABA units in a *** studied copolymers and their complexes with Tb^(3+)have low cytotoxicity and a pronounced antiviral activity against human respiratory syncytial virus.

关键词： Luminescence Water-soluble copolymers Lanthanide complexes Antiviral activity Cytotoxicity

Prompt neutron emission in ^(250)no spontaneous fission associated with ground and isomeric state decays

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Chinese Physics C 2024年第6期48卷 112-117页

作者： R.S.mukhin A.v.isaev A.v.Andreev m.L.Chelnokov v.i.Chepigin H.m.Devaraja i.n.izosimov A.A.Kuznetsova o.n.malyshev A.g.Popeko Yu.A.Popov A.Rahmatinejad B.Sailaubekov T.m.Shneidman E.A.Sokol A.i.Svirikhin m.S.Tezekbayeva m.A.Bychkov A.v.Yeremin o.Dorvaux B.gall K.Kessaci K.Hauschild A.Lopez-martens joint institute for nuclear Research Dubna141980Russia Dubna State University Dubna141982Russia institute of nuclear Physics Almaty050032Kazakhstan L.n.gumilyov Eurasian national University Astana010008Kazakhstan Kazan federal University Kazan420008Russia Universitéde Strasbourg CNRSStrasbourg67000France ijCLab IN2P3-CNRSUniversitéParis-SaclayOrsay91400France

The complete-fusion reaction^(204)Pb(^(48)Ca,2n)^(250)no was used to study two activities of^(250)no with distinct half-lives.A total of 1357 events were observed in the Sfinx neutron detection *** average number of neutrons emitted per spontaneous fission of^(250)no was determined to be(4.1±0.1).The unusually symmetrical shape of the prompt neutron multiplicity distribution was restored and presented for the first *** tests were performed to compare the prompt neutron multiplicity distributions associated with the ground state and K-isomer state decays.

关键词： spontaneous fission prompt neutrons actinide

ion heat transport in electron cyclotron resonance heated L-mode plasma on the T-10 tokamak

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Plasma Science and Technology 2024年第4期26卷 52-60页

作者： v.A.KRUPin m.R.nURgALiEv A.R.nEmETS i.A.ZEmTSov S.D.SUnTSov T.B.mYALTon D.S.SERgEEv n.A.SoLovEv D.v.SARYCHEv D.v.RYjAKov S.n.TUgARinov n.n.nAUmEnKo national Research Centre“Kurchatov institute” Moscow 123182Russia Bauman moscow State Technical University Moscow 105005Russia institution“Project Center iTER” Moscow 123098Russia jSC“SoLAR” Minsk 220034Belarus

Anomalous ion heat transport is analyzed in the T-10 tokamak plasma heated with electron cyclotron resonance heating(ECRH) in second-harmonic extra-ordinary mode. Predictive modeling with empirical scaling for ohmical heat conductivity shows that in ECRH plasmas the calculated ion temperature could be overestimated, so an increase of anomalous ion heat transport is required. To study this effect two scans are presented: over the EC resonance position and over the ECRH power. The EC resonance position varies from the high-field side to the low-field side by variation of the toroidal magnetic field. The scan over the heating power is presented with on-axis and mixed ECRH regimes. Discharges with high anomalous ion heat transport are obtained in all considered regimes. in these discharges the power balance ion heat conductivity exceeds the neoclassical level by up to 10 times. The high ion heat transport regimes are distinguished by three parameters: the ratio Te/Ti, the normalized electron density gradient R/■, and the ion–ion collisionality νii~*. The combination of high Te/Ti, high νii~*, and R/■=6-10 results in values of normalized anomalous ion heat fluxes up to 10 times higher than in the low transport scenario.

关键词： tokamak L-mode electron cyclotron resonance heating ion heat transport

Cluster Analysis of the Roma-BZCAT Blazars

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Research in Astronomy and Astrophysics 2024年第5期24卷 117-139页

作者： Dmitry o.Kudryavtsev Yulia v.Sotnikova vladislav A.Stolyarov Timur v.mufakharov valery v.vlasyuk margarita L.Khabibullina Alexander g.mikhailov Yulia v.Cherepkova Special Astrophysical observatory of the Russian Academy of Sciences Nizhny Arkhyz 369167Russia Astrophysics group Cavendish LaboratoryUniversity of CambridgeCambridge CB3 OHEUK Kazan federal University 18 Kremlyovskaya StKazan 420008Russia

Based on the collected multiwavelength data, namely in the radio(nvSS, fiRST, RATAn-600), iR(WiSE),optical(Pan-STARRS), Uv(gALEX), and X-ray(RoSAT, Swift-XRT) ranges, we have performed a cluster analysis for the blazars of the Roma-BZCAT catalog. Using two machine learning methods, namely a combination of PCA with k-means clustering and Kohonen's self-organizing maps(Soms), we have constructed an independent classification of the blazars(five classes) and compared the classes with the known Roma-BZCAT classification(fSRQs, BL Lacs, galaxy-dominated BL Lacs, and blazars of an uncertain type) as well as with the high synchrotron peaked(HSP) blazars from the 3HSP catalog and blazars from the TevCat catalog. The obtained groups demonstrate concordance with the BL Lac/fSRQ classification along with a continuous character of the change in the properties. The group of HSP blazars stands out against the overall distribution. We examine the characteristics of the five groups and demonstrate distinctions in their spectral energy distribution shapes. The effectiveness of the clustering technique for objective analysis of multiparametric arrays of experimental data is demonstrated.

关键词： methods data analysis-galaxies active-(galaxies:)BL Lacertae objects general