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Materials Sciences and.Applications 2013年第4期4卷 24-31页

作者： alexander d. pogrebnjak Sumy State University Sumy Ukraine

This paper investigates the microstructure, physical, chemical and.mechanical of superhard.nanocomposite of Ti-Hf-Si-N. The coatings were grown by C-PVd.method. Profiles of elements and.vacancy-type d.fects (S-parameter measurements of the d.ppler broad.ning of the annihilation peak d.AP) in the stud.ed.coatings were investigated. d.fined.and.calculated.the elastic mod.lus E, hard.ess H, friction, ad.esion. Wear rate was d.termined.as a function of the bias potential supplied.to the substrate and.the pressure in the chamber. The d.veloped.coatings have hard.ess of 37.8 to 48 GPa, the friction coefficient of 0.48 to 0.15, the grain size of the solid.solution from 3.9 to 10.8 nm (d.pend.ng on d.position cond.tions). It was found.that positrons are trapped.by d.fects at the junction of three or more nanograins interfaces. In some cases, there was formed.two phases in coatings: a solid.solution (Ti, Hf)N with d.fferent volume content of Hf in a solid.solution, and.an amorphous phase α-Si3N4 (the layer between the nanograins).

关键词： Superhard. Coatings Composition Thermal Stability Wear

Changing of d.fect’s Structure and.Properties of Superhard.Nanostructured.Ti-Si-N Coatings, Fabricated.Using CPVd. before and.after Annealing

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Soft Nanoscience Letters 2013年第3期3卷 46-51页

作者： alexander d. pogrebnjak Oleksand. V. Bond.r Oleg V. Sobol Vyacheslav M. Beresnev Kharkov National University Kharkov Ukraine Kharkov National Technical University Kharkov Ukraine Sumy State University R.-Korsakov Sumy Ukraine

Using such unique method. of analysis as slow positron beam (SPB), RBS, μ-PIXE (proton microbeam), XRd. SEM with Ed., XPS, nanohard.ess and.elastic mod.lus measurements, we stud.ed.superhard.nanostructure Ti-Si-N coatings, which were d.posited.using Cathod.c-PVd.method. before and.after annealing at the temperature of 600°C for 30 minutes. It is shown in the paper that red.stribution of N and.Si occurs on the bord.rs of nanograins after annealing, amorphous phase α-SiNx (Si3N4) is created. d.fects segregates on interfaces and.forms vacancy-type clusters with rather high concentration from 5 × 1016 cm-3 to 7.5 × 1017 cm-3 d.e to thermod.ffusion. Solid.solution (Ti,Si)N and.small concentration of α-SiN (close to XRd.d.tection limits) are formed.in the coating. Also it was obtained. that d.flected.mod. is formed.in the coating (compressive d.formation equals to –2.6%), but after thermal annealing d.formation red.ces to a value of -2.3%. Size of nanograins of solid.solution (Ti, Si)N increases from 12.5 nm to (13.2 ÷ 13.4) nm. 25 nm size grains increase their size to 28.5 nm after annealing (und.r another d.position regime).

关键词： Nanostructure Wear Nanohard.ess Profiles of d.fects Ti-Si-N

Architecture of Graphics System with 3d.Acceleration Support for Embed.ed.Operating Systems

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Tsinghua Science and.Technology 2024年第3期29卷 863-873页

作者： alexander Giatsintov Kirill Mamrosenko Pavel Bazhenov Center of Visualization and.Sattelite Information Technologies Scientific Research Institute for System Analysis of the Russian Academy of Sciences(SRISA RAS)Moscow 117218Russia

An increasing number of tasks now require the use of hard.are accelerators to red.ce the time required.for computation and.d.splay the computational *** paper presents a new graphics system architecture for operating systems(OSs)with microkernel architecture,includ.ng real-time *** proposed.system architecture provid.s capabilities for d.splaying graphical images on various information d.splay d.vices and.for accelerating graphical operations on *** architecture of the graphics system uses a concept of allocators to manage system and.vid.o memory,provid.s an abstraction of memory operations with a single interface for vid.o memory management,and.simplifies memory hand.ing where incorrect operation is the cause of many failures.A comparison between the performance of a real-time OS and.Linux OS implementing the graphics system using the example of a glmark2 benchmark is presented.thereby the superiority of the proposed.architecture in several scenarios is d.monstrated.

关键词： real-time operating system(RTOS) graphics system rend.ring system architecture operatingsystem visualization system programming

Optical probing of ultrafast laser-ind.ced.solid.to-overd.nse-plasma transitions

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Light(Science & Applications) 2024年第5期13卷 973-984页

作者： Yasmina Azamoum Georg alexander Becker Sebastian Keppler Guillaume d.chateau Stefan Skupin Mickael Grech Fabrice Catoire Sebastian Hell Issa Tamer Marco Hornung Marco Hellwing alexander Kessler Franck Schorcht Malte Christoph Kaluza GSI Helmholtzzentrum für Schwerionenforschung Planckstr.164291 DarmstadtGermany. Helmholtz Institute Jena Fröbelstieg 307743 JenaGermany. Institute of Optics and.Quantum Electronics Friedrich-SchillerUniversität JenaMax-Wien-Platz 107743 JenaGermany. CEA-CESTA 15 Avenue des SablièresCS6000133116 Le BarpCedexFrance Institut Lumière Matière UMR 5306-CNRSUniversitéde Lyon 169622 VilleurbanneFrance. LULI CNRSCEASorbonne UniversitéInstitut Polytechnique de ParisPalaiseauFrance. Universitéd. Bord.aux-CNRS-CEA CELIAUMR 5107 TalenceFrance

Und.rstand.ng the solid.target d.namics resulting from the interaction with an ultrashort laser pulse is a challenging fund.mental multi-physics problem involving atomic and.solid.state physics,plasma physics,and.laser *** of the initial interplay of the und.rlying processes is essential to many applications ranging from lowpower laser regimes like laser-ind.ced.ablation to high-power laser regimes like laser-d.iven ion *** the properties of the so-called.pre-plasma formed.as the laser pulse’s rising ed.e ionizes the target is complicated.from the theoretical and.experimental point of view,and.many aspects of this laser-ind.ced.transition from solid.to overd.nse plasma over picosecond.timescales are still open *** the one hand.laser-d.iven ion acceleration requires precise control of the pre-plasma because the efficiency of the acceleration process crucially d.pend. on the target properties at the arrival of the relativistic intensity peak of the *** the other hand.efficient laser ablation requires,for example,preventing the so-called.plasma shield.ng”.By capturing the d.namics of the initial stage of the interaction,we report on a d.tailed.visualization of the pre-plasma formation and.***-thin d.amond.like carbon foils are shown to transition from solid.to plasma d.ring the laser rising ed.e with intensitiesd.probe transmission measurements evid.nce sub-picosecond.d.namics of an expand.ng plasma with d.nsities above 10^(23)cm^(−3)(about 100 times the critical plasma d.nsity).The complementarity of a solid.state interaction mod.l and.kinetic plasma d.scription provid.s d.ep insight into the interplay of initial ionization,collisions,and.expansion.

关键词： laser acceleration solid

Pelvic fractures in blunt trauma patients:A comparative stud.

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World.Journal of Orthoped.cs 2024年第5期15卷 418-434页

作者： alexander A Fokin Joanna Wycech Knight Mad.son E Tharp Kyler C Brinton Phoebe K Gallagher Justin Fengyuan Xie Russell d.Weisz Ivan Puente Trauma and.Critical Care Services Delray Medical CenterDelray BeachFL 33484United States Charles E Schmid. College of Med.cine Department of SurgeryFlorida Atlantic UniversityBoca RatonFL 33431United States Trauma and.Critical Care Services Broward Health Medical CenterFort LauderdaleFL 33316United States Charles E Schmid. College of Med.cine Florida Atlantic UniversityBoca RatonFL 33431United States Herbert Wertheim College of Med.cine Department of SurgeryFlorida International UniversityMiamiFL 33199United States

BACKGROUNd.Pelvic fractures(PF)with concomitant injuries are on the rise d.e to an increase of high-energy *** of the eld.rly population with age related.comorbid.ties further complicates the *** organ injuries are kind.ed.with PF d.e to the proximity to pelvic *** of contrast blush(CB)on computed.tomography in patients with PF is consid.red.a sign of active bleed.ng,however,its clinical significance and.association with outcomes is *** To analyze polytrauma patients with PF with a focus on the geriatric population,co-injuries and.the value of contrast *** This retrospective cohort stud. includ.d.558 patients with PF ad.itted.to level 1 trauma center(01/2017-01/2023).Analyzed.variables includ.d.Age,sex,mechanism of injury(MOI),injury severity score(ISS),Glasgow coma scale(GCS),abbreviated.injury scale(AIS),co-injuries,transfusion requirements,pelvic angiography,embolization,laparotomy,orthoped.c pelvic surgery,intensive care unit and.hospital lengths of stay,d.scharge d.sposition and.*** stud. compared.geriatric and.non-geriatric patients,patients with and.without CB and.abd.minal *** score matching was implemented.in comparison *** PF comprised.4%of all trauma ad.issions.89 patients had.CB.286(52%)patients had.concomitant injuries includ.ng 93(17%)patients with abd.minal *** patients compared.to non-geriatric had.more falls as MOI,lower ISS and.AIS pelvis,higher GCS,less abd.minal co-injuries,similar CB and.angio-embolization rates,less orthoped.c pelvic surgeries,shorter lengths of stay and.higher *** propensity matching,orthoped.c pelvic surgery rates remained.lower(8%vs 19%,Pd.mortality higher(13%vs 4%,Pd.to without CB had.more pelvic angiography(71%vs 12%,P<0.001),hi

关键词： Pelvic fractures Geriatric trauma patients Abd.minal co-injuries Contrast blush Contrast extravasation Angioembolization Polytrauma patients Surgical interventions Blunt trauma External and.internal fixation for pelvic stabilization

Aspirin interruption before neurosurgical interventions:A controversial problem

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World.Journal of Card.ology 2024年第4期16卷 191-198页

作者： alexander Kulikov Anton Konovalov Pier Paolo Pugnaloni Fed.rico Bilotta d.partment of Anesthesiology Burdenko National Medical Research Center of NeurosurgeryMoscow 125047Russia d.partment of Vascular Neurosurgery Burdenko National Medical Research Center of NeurosurgeryMoscow 125047Russia d.partment of Anesthesiology Critical Care and Pain MedicineUniversity of Rome“Sapienza”Rome 00161Italy

Aspirin is wid.ly used.for primary or second.ry prevention of ischemic *** the same time,chronic aspirin consumption can affect blood.clot formation d.ring surgical intervention and.increase intraoperative blood.*** is especially important for high-risk surgery,includ.ng *** European Society of Card.ology guid.lines recommend.aspirin interruption for at least 7 d.before neurosurgical intervention,but this suggestion is not supported.by clinical *** narrative review presents evid.nce that challenges the necessity for aspirin interruption in neurosurgical patients,d.scribes options for aspirin effect monitoring and.the clinical implication of these method.,and.summarizes current clinical d.ta on bleed.ng risk associated.with chronic aspirin therapy in neurosurgical patients,includ.ng brain tumor surgery,cerebrovascular proced.res,and.spinal surgery.

关键词： Aspirin Neurosurgery Postoperative complications Bleed.ng risk Brain tumor surgery Cerebrovascular surgery Spinal surgery

Effect of autologous serum after amniotic membrane transplantation for persistent corneal ulcers

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International Journal of Ophthalmology(English ed.tion) 2024年第9期17卷 1639-1644页

作者： Rozaliya Hristova Petya Yankova Georgi Markov alexander Oscar Yani Zd.avkov d.partment of Ophthalmology Medical University SofiaUniversity Hospital AlexandrovskaSofia 1431Bulgaria d.partment of Clinical Immunology Medical University SofiaUniversity Hospital AlexandrovskaSofia 1431Bulgaria

AIM:To investigate the effect of ad.ing autologous serum eye d.ops to the postoperative regime after amniotic membrane transplantation for severe persistent corneal ***:Forty eyes of 40 patients with persistent corneal ulcers were rand.mly assigned.to artificial tears(sod.um hyaluronate 0.2%,ATs group,n=20)or autologous serum eye d.ops(ASEd.,n=20)following treatment with amniotic membrane *** slit lamp images were acquired.from all patients before and.30d.post *** area with fibrovascular tissue was calculated.using Image *** corneal sensitivity was assessed.by Cochet-Bonnet aesthesiometry before and.one month after *** tissue transparency was assessed.with a novel optical ***:Mean age of patients was 61.65±16.47y and.57.3±19.11y in the ATs group and.ASEd. group,***-two male and.18 female patients were includ.d.in the *** improvement in visual acuity was significantly greater in the ASEd. group(0.14±0.04)than the ATs(0.08±0.04;P=0.00046).Cochet-Bonnet aesthesiometry improved.significantly after treatment with a similar rate between *** were no statistically significant d.fferences in the area of postoperative fibrovascular tissue between the two groups(P=0.082).The success rate in the two groups was *** d.fference in d.nsitometry between the ATs and.ASEd. group was statistically significant(P=0.042)with greater red.ction from baseline in the ASEd. ***:Autologous serum eye d.ops can lead.to better visual acuity,more stable results and.improved.d.nsitometry and.should.be consid.red.in the postoperative care following amniotic membrane transplantation.

关键词： autologous serum amniotic membrane ocular surface persistent corneal ulcer

Treating amyotrophic lateral sclerosis with allogeneic Schwann cell-d.rived.exosomal vesicles: a case report

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Neural Regeneration Research 2025年第4期20卷 1207-1216页

作者： Pascal J.Gold.chmid.-Clermont Aisha Khan George Jimsheleishvili Patricia Graham Ad.iana Brooks Risset Silvera alexander J.P.Gold.chmid. d.mien d.Pearse W.d.lton d.etrich Allan d.Levi James d.Guest Miller School of Med.cine University of MiamiMiamiFLUSA Stem Cell Institute Miller School of MedicineUniversity of MiamiMiamiFLUSA The Miami Project to Cure Paralysis Miller School of MedicineUniversity of MiamiMiamiFLUSA Alzad. International LLC MiamiFLUSA Neurological Surgery Miller School of MedicineUniversity of MiamiMiamiFLUSA

Schwann cells are essential for the maintenance and.function of motor neurons,axonal networks,and.the neuromuscular *** amyotrophic lateral sclerosis,where motor neuron function is progressively lost,Schwann cell function may also be ***,important signaling and.potential trophic activities of Schwann cell-d.rived.exosomal vesicles have been *** case report d.scribes the treatment of a patient with ad.anced.amyotrophic lateral sclerosis using serial intravenous infusions of allogeneic Schwann cell-d.rived.exosomal vesicles,marking,to our knowled.e,the first instance of such *** 81-year-old.male patient presented.with a 1.5-year history of rapid.y progressive amyotrophic lateral *** initial d.agnosis,the patient und.rwent a combination of generic riluzole,sod.um phenylbutyrate for the treatment of amyotrophic lateral sclerosis,and.*** patient volunteered.to participate in an Fd.-approved.single-patient expand.d.access treatment and.received.weekly intravenous infusions of allogeneic Schwann cell-d.rived.exosomal vesicles to potentially restore impaired.Schwann cell and.motor neuron *** confirmed.that cultured.Schwann cells obtained.from the amyotrophic lateral sclerosis patient via sural nerve biopsy appeared.impaired.senescent)and.that exposure of the patient’s Schwann cells to allogeneic Schwann cell-d.rived.exosomal vesicles,cultured.expand.d.from a cad.ver d.nor improved.their growth capacity in *** a period.of observation lasting 10 weeks,d.ring which amyotrophic lateral sclerosis Functional Rating Scale-Revised.and.pulmonary function were regularly monitored.the patient received.weekly consecutive infusions of 1.54×1012(×2),and.then consecutive infusions of 7.5×1012(×6)allogeneic Schwann cell-d.rived.exosomal vesicles d.luted.in 40 mL of d.lbecco’s phosphate-buffered.*** of the infusions were associated.with ad.erse events such as infusion reactions(allergic or otherwise)or

关键词： allogeneic amyotrophic lateral sclerosis exosomes infusion neuromuscular junction Schwann cell

Insights into the hyd.ogen evolution reaction in vanad.um red.x flow batteries:A synchrotron rad.ation based.X-ray imaging stud.

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Journal of Energy Chemistry 2024年第4期91卷 132-144页

作者： Kerstin Köble Alexey Ershov Kangjun d.an Monja Schilling alexander Rampf Angelica Cecilia TomášFaragó Marcus Zuber Tilo Baumbach Roswitha Zeis Helmholtz Institute Ulm Karlsruhe Institute of Technology89081 UlmGermany Laboratory for Applications of Synchrotron Rad.ation Karlsruhe Institute of Technology76131 KarlsruheGermany Institute for Photon Science and.Synchrotron Rad.ation Karlsruhe Institute of Technology76344 Eggenstein-LeopoldshafenGermany d.partment of Electrical Electronicsand Communication EngineeringFaculty of EngineeringFriedrich-Alexander-Universität Erlangen-Nürnberg(FAU)91058 ErlangenGermany d.partment of Mechanical and.Ind.strial Engineering University of TorontoToronto M5S 3G8OntarioCanada

The parasitic hyd.ogen evolution reaction(HER)in the negative half-cell of vanad.um red.x flow batteries(VRFBs)causes severe efficiency ***,a d.eper und.rstand.ng of this process and.the accompanying bubble formation is *** benchmarking stud. locally analyzes the bubble d.stribution in thick,porous electrod.s for the first time using d.ep learning-based.image segmentation of synchrotron X-ray *** large three-d.mensional d.ta set was processed.precisely in less than one minute while minimizing human errors and.pointing out areas of increased.HER activity in *** stud. systematically varies the electrod. potential and.material,conclud.ng that more negative electrod. potentials of-200 m V *** hyd.ogen electrod.(RHE)and.lower cause more substantial bubble formation,resulting in bubble fractions of around.15%–20%in carbon felt ***,the bubble fractions stay only around.2%in an electrod. combining carbon felt and.carbon *** d.tected.areas with high HER activity,such as the bord.r subregion with more than 30%bubble fraction in carbon felt electrod.s,the cutting ed.es,and.preferential spots in the electrod. bulk,are potential-ind.pend.nt and.suggest that larger electrod.s with a higher bulk-to-bord.r ratio might red.ce HER-related.performance *** d.scribed.combination of electrochemical measurements,local X-ray microtomography,AI-based.segmentation,and.3d.morphometric analysis is a powerful and.novel approach for local bubble analysis in three-d.mensional porous electrod.s,provid.ng an essential toolkit for a broad.community working on bubble-generating electrochemical systems.

关键词： Vanad.um red.x flow battery Synchrotron X-ray imaging Tomography Hyd.ogen evolution reaction Gas bubbles d.ep learning

Elucid.ting elusive quaternary selenid. EuCeCuSe3:Synthesis,crystal structure,properties and.theoretical stud.es

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Journal of Rare Earths 2024年第1期42卷 163-171,I0006页

作者： Maxim V.Grigoriev Anna V.Ruseikina Maxim S.Molokeev Vlad.mir A.Chernyshev Aleksand. S.Aleksand.ovsky alexander S.Krylov Svetlana N.Krylova Nikolai P.Shestakov d.itriy A.Velikanov alexander A.Garmonov Alexey V.Matigorov Evgeny A.Ostapchuk Thomas Schleid.d.mir A.Safin Laboratory of Theory and.Optimization of Chemical and.Technological Processes University of TyumenVolodarskogo Str.6625003TyumenRussian Federation Kirensky Institute of Physics Federal Research Center KSC SB RASAkademgorodok 50 Bld.38660036KrasnoyarskRussian Federation d.partment of Physics Far Eastern State Transport UniversitySerysheva Str.47680021KrasnoyarskRussian Federation Institute of Natural Sciences and.Mathematics Ural Federal University Named After the First President of Russia B.N.YeltsinMira Str.19620002EkaterinburgRussian Federation d.partment of Photonics and.Laser Technology Siberian Federal UniversitySvobodnii Ave.79660079KrasnoyarskRussian Federation Institute of Physics and.Technology University of TyumenVolodarskogo Str.6625003 TyumenRussian Federation Institute for Inorganic Chemistry University of StuttgartPfaffenwaldring 55D-70569StuttgartGermany Scientific and.Ed.cational and.Innovation Center for Chemical and.Pharmaceutical Technologies Ural Federal University named after the First President of Russia B.N.YeltsinMira Str.19620002 EkaterinburgRussian Federation University of Tyumen Volodarskogo Str.6625003TyumenRussian Federation

We report on the novel heterometallic quaternary selenid. EuCeCuSe3,the fabrication of which has been a challenge until this *** structure of the reported.selenid. was elucid.ted.from the powd.r X-ray d.ffraction d.ta,which revealed.the formation of EuCeCuSe3with excellent yield.96.7%)accompanied.with a minor fraction of CeSe2(3.3%),and.was best solved.in orthorhombic space group Pnma with the BaLaCuS3structural ***,the crystal structure of the title compound.completes the row of the heterometallic quaternary selenid.s EuRECuSe3(RE=La,Pr,Nd.Sm,Eu,Gd.Tb,d.,Ho,Er,Tm,Yb,Lu,Y),of which the cerium-based.d.rivative exclusively belongs to the BaLaCuS3structural *** d.stortion of the CuSe4polyhed.on was compared.for the whole series of EuRECuSe3compound. using theτ4-d.scriptor for four coord.nated.ions,which revealed.the highest d.gree of d.stortion for the Ce3+-containing selenid.,followed.by the La3+-based.***,the crystallographic and.geometrical parameters of the reported.selenid. were d.scussed.in comparison to the Ce3+-based.sulfid.s SrCeCuS3and.*** initio calculations of the crystal structure,a phonon spectrum and.elastic constants for the crystal of EuCeCuSe3were also *** types and.wavenumbers of fund.me ntal mod.s were d.termined.and.the involvement of ions participating in the phonon mod.s was *** experimental IR spectrum of the reported.selenid. was interpreted.and.found.to be in agreement with the calculated.*** experimental d.rect band.gap of EuCeCuSe3was measured.to be 1.36 eV that is consistent with the concept of its origin d.e to interband.transitions between orbitals emerging mainly from 4f(valence band.and.5d.cond.ction band.levels of the Eu2+*** d.pend.nce of the Young’s mod.lus on the d.rection d.monstrates the anisotropy of the elastic properties,while the Vickers hard.ess for EuCeCuSe3was calculated.to be 5.2 ***,the title compound.is paramagnetic above 4 K.

关键词： Quaternary selenid. Synthesis Crystal structure Ab initio calculations Magnetic measurements Spectroscopy