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Laser directed energy deposited, ultrafine-grained functional titanium-copper alloys tailored for marine environments: Antibacterial and anti-microbial corrosion studies

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Journal of Materials Science & Technology 2023年第35期166卷 21-33页

作者： Jiaqi Li duyao Zhang Xiaobo Chen dake Xu dong Qiu Fuhui Wang mark Easton Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China School of Engineering Centre for Additive ManufacturingRMIT UniversityMelbourneVIC 3000Australia

The microorganism-rich nature of the ocean imposes great challenges to the structural integrity of met-als over their service lifespan,including titanium(Ti)alloys,which are usually prone to microbiologically influenced corrosion(MIC).So,multifunctional anti-MIC Ti alloys need to be developed and *** paper investigates the effect of copper(Cu)concentration on the MIC resistance of a series of additively manufactured,ultrafine-grained Ti-x Cu(x=3.5,6.5 and 8.5 in wt.%)*** dependence of the cor-rosion resistance and MIC resistance on the Cu concentration of Ti-Cu alloy is interpreted considering all conceivable *** mechanisms for excellent corrosion resistance of Ti-Cu alloy in seawater are attributed to the strong passive film and small surface potential difference between ***-tural characterization reveals that uniformly distributed,nanosized Ti_(2) Cu phase led to increased reactive oxygen species in the bacterial membrane,which is the root reason for the superb anti-bacterial property(99.2%)for *** to pure Ti and Ti-6Al-4V,Ti-8.5Cu alloy features both high strength(yield stress>1000 MPa)and the best MIC resistance(97.5%).The combination of such balanced properties enables this functional 3d printed Ti-Cu alloy to become an ideal material for load-bearing applications in the marine environment.

关键词： Multifunctional titanium alloys Additive manufacturing Ultrafine grains Microbiologically influenced corrosion resistance Mechanical property Antibacterial property

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High-throughput calculations of charged point defect properties with semi-local density functional theory— performance benchmarks for materials screening applications

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npj Computational Materials 2023年第1期9卷 1628-1639页

作者： danny Broberg Kyle Bystrom Shivani Srivastava diana dahliah Benjamin A.d.Williamson Leigh Weston david O.Scanlon Gian-Marco Rignanese Shyam dwaraknath Joel Varley Kristin A.Persson mark Asta Geoffroy Hautier Materials Sciences division Lawrence Berkeley National Laboratory1 Cyclotron RoadBerkeleyCA 94720USA department of Materials Science and Engineering University of CaliforniaBerkeleyCA 94720USA John A.Paulson School of Engineering and Applied Sciences Harvard UniversityCambridgeMA 02138USA department of Physics An-Najah National UniversityNablusPalestine Institute of Condensed Matter and Nanosciences UniversitéCatholique de LouvainChemin desÉtoiles 8B-1348 Louvain-la-NeuveBelgium department of Materials Science and Engineering NTNU Norwegian University of Science and TechnologyTrondheimNorway Energy Technologies Area Lawrence Berkeley National Laboratory1 Cyclotron RoadBerkeleyCA 94720USA department of Chemistry University College London20 Gordon StreetLondon WC1H 0AJUK Thomas Young Centre University College LondonGower StreetLondon WC1E 6BTUK diamond Light Source Ltd. Diamond HouseHarwell Science and Innovation CampusDidcotOxfordshire OX110DEUK Lawrence Livermore National Laboratory LivermoreCA 94550USA Molecular Foundry Lawrence Berkeley National Laboratory1 Cyclotron RoadBerkeleyCA 94720USA Thayer School of Engineering Dartmouth CollegeHanoverNH 03755USA

Calculations of point defect energetics with density Functional Theory(dFT)can provide valuable insight into several optoelectronic,thermodynamic,and kinetic *** calculations commonly use methods ranging from semi-local functionals with a-posteriori corrections to more computationally intensive hybrid functional *** applications of dFT-based high-throughput computation for data-driven materials discovery,point defect properties are of interest,yet are currently excluded from available materials *** work presents a benchmark analysis of automated,semi-local point defect calculations with a-posteriori corrections,compared to 245“gold standard”hybrid calculations previously *** consider three different a-posteriori correction sets implemented in an automated workflow,and evaluate the qualitative and quantitative differences among four different categories of defect information:thermodynamic transition levels,formation energies,Fermi levels,and dopability *** highlight qualitative information that can be extracted from high-throughput calculations based on semi-local dFT methods,while also demonstrating the limits of quantitative accuracy.

关键词： properties defect correction

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Combining spatial modelling and radar to identify and protect avian migratory hot-spots

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Current Zoology 2014年第5期60卷 680-691页

作者： mark dESHOLM Rashpal GILL Thomas BOVITH Anthony d. FOX department of Bioscience Aarhus University Kalo Grenavej 14 8410 Ronde Denmark BirdLife denmark Vesterbrogade 140 1620 Copenhagen V Denmark Research department Danish Meteorological Institute Lyngbyvej 100 2100 Copenhagen O Denmark

Migrating landbirds are known to follow coast lines and concentrate on peninsulas prior to crossing water bodies, especially during daylight but also at night, creating enhanced potential collision hazards with man-made objects. Knowing where these avian migration “hot-spots” occur in time and space is vital to improve flight safety and inform the spatial planning process (e.g. environmental assessments for offshore windfarms). We developed a simple spatial model to identify avian migration hot-spots in coastal areas based on prevailing migration orientation and coastline features known, from visual and radar observations, to concentrate migrating landbirds around land masses. Regional scale model validation was achieved by combining nocturnal passerine movement data gathered from two tier radar coverage (long-range dual-polarization doppler weather radar and short-range marine surveillance radar) and standardised bird ringing. Applied on a national scale, the model correctly identified the ten most important danish coastal hot-spots for spring migrants and predicted the relative numbers of birds that concentrated at each site. These bird numbers corresponded well with historical observational data. Here, we provide a potential framework for the establishment of the first three-dimensional avian airspace sanctuaries, which could contribute to more effective conservation of long-distance migratory birds.

关键词：鸟类保护区雷达识别迁徙空间建模多普勒天气雷达空间模型沿海地区海上风电场

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Hepatocellular carcinoma,human immunodeficiency virus and viral hepatitis in the HAART era

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World Journal of Gastroenterology 2008年第11期14卷 1657-1663页

作者： douglas C Macdonald mark nelson mark Bower Thomas Powles Chelsea and Westminster hospital LondonUnited Kingdom St Bartholomew’s Hospital LondonUnited Kingdom

The incidence of hepatocellular carcinoma(HCC)in patients with human immunodeficiency virus(HIV) is *** in HIV almost invariably occurs in the context of hepatitis C virus(HCV)or hepatitis B virus (HBV)co-infection and,on account of shared modes of transmission,this occurs in more than 33% and 10% of patients with HIV worldwide *** has yet to be clearly established whether HIV directly accelerates HCC pathogenesis or whether the rising incidence is an epiphenomenon of the highly active antiretroviral therapy(HAART)era,wherein the increased longevity of patients with HIV allows long-term complications of viral hepatitis and cirrhosis to *** this question will have implications for HCC surveillance and the timing of HCV/HBV therapy,which in HIV co-infection presents unique *** HCC develops,there is growing evidence that HIV co-infection should not preclude conventional therapeutic strategies,including liver transplantation.

关键词：肝细胞癌人类免疫缺陷病毒肝炎乙肝病毒

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Ventricular Arrhythmia in the Fontan Circulation:Prevalence,Risk Factors and Clinical Implications

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Congenital Heart disease 2023年第5期18卷 507-523页

作者： Charis Tan diana Zannino Carley Clendenning Sophie Offen Thomas LGentles Julian Ayer david Tanous Vishva Wijesekera Leeanne Grigg david Celermajer mark McGuire Yves d’Udekem Rachael Cordina department of Cardiothoracic Surgery Royal Prince Alfred HospitalCamperdownAustralia Sydney Medical School University of SydneyCamperdownAustralia Clinical Epidemiology and Biostatistics Unit Murdoch Children’s Research InstituteParkvilleAustralia department of Cardiology Royal Prince Alfred HospitalCamperdownAustralia department of Paediatric Cardiology Starship HospitalAucklandNew Zealand department of Paediatric Cardiology The Children’s Hospital at WestmeadWestmeadAustralia department of Cardiology Westmead HospitalWestmeadAustralia Adult Congenital Heart disease Unit The Prince Charles HospitalBrisbaneAustralia department of Cardiology The Royal Melbourne HospitalMelbourneAustralia Heart Research Institute CamperdownAustralia department of Cardiac Surgery The Royal Children’s Hospital MelbourneParkvilleAustralia department of Paediatrics The University of MelbourneParkvilleAustralia

Objective:Sudden cardiac death(SCd)and malignant ventricular arrhythmia(VA)are increasingly recognized as important issues for people living with a Fontan circulation,but data are *** sought to characterize the cohort who had sudden cardiac death,most likely related to VA and/or documented VA in the Australia and New Zealand Fontan Registry including risk factors and clinical ***:A retrospective cohort study was *** criteria were documented non-sustained ventricular tachycardia,sustained ventricular tachycardia,ventricular fibrillation,resuscitated cardiac arrest or SCd>30 days post-Fontan ***:Of 1611 patients,20(1.2%)had VA;14(1.0%)had VA without SCd and 6(d SCd(6%of all deaths recorded in Registry;5 of those had documented VA at the time of arrest and 1 was presumed to be VA-associated).The median age at first VA was 20.5(14–32)years,10(50%)were females,and the median age at Fontan operation was 8(4–17)*** univariable analysis,hypoplastic left heart syndrome(p=0.03)and older age Fontan operation(pd with *** Fontan era(pd with *** with VA had a 3 times higher risk of death or heart transplant(HR 3.27(1.19,8.98),p=0.02).Conclusions:A proportion of people living with a Fontan circulation have malignant *** VA screening in this cohort is *** data are needed to aid risk stratification.

关键词： Fontan congenital cardiac arrhythmia sudden cardiac death ventricular tachyarrhythmia

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Protecting miners from coal bursts during development above historic mine workings in Harlan County,KY

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International Journal of Mining Science and Technology 2021年第1期31卷 111-116页

作者： Christopher mark Mine Safety and Health Administration PittsburghPA 15236USA

In order to reach a large,untapped reserve of high-quality coal,d8 Cloverlick Mine proposed to mine a corridor nearly 600 m deep beneath the Benham Spur of Black Mountain,Kentucky’s highest peak.d8 Cloverlick Mine was extracting the Owl seam,but the corridor’s route lay approximately 20 m above century-old mine workings in the C–(darby)*** to the concern,three serious coal bursts had recently occurred in nearby Owl seam *** of the old workings seemed to indicate that the underlying C–seam had been fully ***,two of the coal bursts had occurred above areas where the C–Seam was also shown as mined *** Safety and Health Administration(MSHA)Technical Support therefore investigated the records of past mining to better understand the old mine *** conditions observed in current Owl seam workings were also compared with the maps of the old C–seam *** study concluded that the presence of hazardous underlying remnants could not be ruled *** mitigate the burst risk,d8 Cloverlick Mine adopted a strategy of stress probe drilling.A self-propelled coal drill was used to auger 11.5-m-long,small diameter holes in advance of *** each hole was drilled,the cuttings were measured to detect the presence of highly stressed *** the crossing was successfully completed without incident.

关键词： Coal bursts Underground mining Room-and-pillar destressing

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Rapid range expansion predicted for the Common Grackle(Quiscalus quiscula)in the near future under climate change scenarios

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Avian Research 2021年第4期12卷 569-575页

作者： Peter Capainolo Utku Perktaş mark dEFellowes division of Vertebrate Zoology-department of Ornithology American Museum of Natural HistoryCentral Park West@79th StreetNew YorkNY 10024-5192USA People and Wildlife Research Group School of Biological SciencesUniversity of ReadingWhiteknightsReading RG66ASUK depart-ment of Biology(Zoology Section Biogeography Research Laboratory)Faculty of ScienceHacettepe UniversityBeytepe06800 AnkaraTurkey

Background:Climate change due to anthropogenic global warming is the most important factor that will affect future range distribution of species and will shape future biogeographic *** much effort has been expended in understanding how climate change will affect rare and declining species we have less of an understanding of the likely consequences for some abundant *** Common Grackle(Quiscalus quiscula;Linnaeus 1758),though declining in portions of its range,is a widespread blackbird(Icteridae)species in North America east of the Rocky *** study examined how climate change might affect the future range distribution of Common ***:We used the R package Wallace and six general climate models(ACCESS1-0,BCC-CSM1-1,CESM1-CAM5-1-FV2,CNRM-CM5,MIROC-ESM,and MPI-ESM-LR)available for the future(2070)to identify climatically suitable areas,with an ecological niche modelling approach that includes the use of environmental ***:Future projections suggested a significant expansion from the current range into northern parts of North America and Alaska,even under more optimistic climate change ***,there is evidence of possible future colonization of islands in the Caribbean as well as coastal regions in eastern Central *** most important bioclimatic variables for model predictions were Annual Mean Temperature,Temperature Seasonality,Mean Temperature of Wettest Quarter and Annual ***:The results suggest that the Common Grackle could continue to expand its range in North America over the next 50 *** research is important in helping us understand how climate change will affect future range patterns of widespread,common bird species.

关键词： Annual mean temperature Climate change Common Grackle Ecological niche modelling Range shift Seasonality

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Application and validation of a 3-d calcium,chloride,and sulfate model in Lake Okeechobee

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Ecological Processes 2014年第1期3卷 1-19页

作者： Kang-Ren Jin mark d Shafer Zhen-Gang Ji Lead Scientist South Florida Water Management DistrictP.O.Box 24680West Palm BeachFL 33416-4680USA Senior Environmental Engineer US Army Corps Engineers701 San Marco BlvdJacksonvilleFL 32207-8175USA Adjunct Professor Department of Civil EngineeringCatholic University of AmericaPangborn HallRoom G12WashingtonDC 20064USA

Introduction: The calibration, verification, and validation of calcium (Ca), chloride (Cl), and sulfate (SO_(4)) module ofthe Lake Okeechobee Environment Model (LOEM) was completed. The integrated model could simulate Ca, Cl, andSO_(4) concentrations and transport due to wind driven currents and waves from 1 Oct 1999 to 30 Sept 2009 in LakeOkeechobee. The enhanced model was also used to estimate lake water quality effects resulting from differentmanagement scenarios that include discharges from planned aquifer storage and recovery (ASR) ***: The fate and transport processes of Ca, Cl, and SO_(4) are controlled by their reactivity and their hydrodynamictransport. Reactivity includes chemical, biological, and bio-uptake processes (IJRSA 33:2233-2260, 2012). Hydrodynamictransport includes advection of water current, diffusion, and turbulent mixing within the water column. The depositionand resuspension on the water-sediment bed interface is also included. The mathematical equations for describing Ca,Cl, and SO_(4) substances, including heavy metal and total organic carbon (TOC), are ***: Both the statistical results and the time series comparisons indicate that the simulation of Ca, Cl, and SO_(4) aregenerally simulated well by the LOEM. The root mean square error over the variance rage is Cl dSO_(4) d SO_(4) concentrations in the lake were largely controlled by water temperature and lakeevaporation. Inflows to the lake can also have localized effects on chloride variations. Shallow water depth and highevaporation contribute to high Cl/Ca/ SO_(4) concentration in the lake.

关键词： Ca Cl SO_(4)modeling Lake Okeechobee Long-term simulation Environmental modeling

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Immunocamouflage of latex surfaces by grafted methoxypoly(ethylene glycol)(mPEG):Proteomic analysis of plasma protein adsorption

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Science China(Life Sciences) 2012年第3期55卷 191-201页

作者： LE Yevgeniya LI Li WANG dunCheng SCOTT mark d Canadian Blood Services Vancouver V6T 1Z3 Canada Centre for Blood Research University of British Columbia Vancouver V6T 1Z3 Canada department of Pathology and Laboratory Medicine University of British Columbia Vancouver V6T 1Z3 Canada

Grafting of methoxypoly(ethylene glycol)(mPEG) to cells and biomaterials is a promising non-pharmacological immunomodulation ***,due to the labile nature of cells,surface-plasma interactions are poorly understood;hence,a latex bead model was *** of beads resulted in a density and molecular weight dependent decrease in total adsorbed protein with a net reduction from(159.9±6.4) ng cm-2 on bare latex to(18.4±0.8) and(52.3±5.3) ng cm-2 on PEGylated beads(1 mmol L-1 of 2 or 20 kd SCmPEG,respectively).SdS-PAGE and iTRAQ-MS analysis revealed differential compositions of the adsorbed protein layer on the PEGylated latex with a significant reduction in the compositional abundance of proteins involved in immune system ***,the biological efficacy of immunocamouflaged cells and materials is mediated by both biophysical obfuscation of antigens and reduced surface-macromolecule interactions.

关键词：聚乙二醇化 MPEG 表面接枝吸附层乳胶蛋白质组血浆蛋白 SdS-PAGE

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Biomass Template derived Boron/Oxygen Co-doped Carbon Particles as Advanced Anodes for Potassium-Ion Batteries

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Energy & Environmental Materials 2022年第1期5卷 344-352页

作者： Xueyu Lian Zhongti Sun Qingqing Mei Yuyang Yi Junhua Zhou mark H.Rummeli Jingyu Sun College of Energy Soochow Institute for Energy and Materials InnovationS(SIEMIS)Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhou 215006China department of Chemistry University of ManchesterManchester M139PLUK Leibniz Institute for Solid State and Materials Research dresden P.O.Box 270116Dresden D-01171Germany Centre of Polymer and Carbon Materials Polish Academy of SciencesM.Curie-Sklodowskiej 34Zabrze 41-819Poland Institute of Environmental Technology VSB-Technical University of Ostrava17.Listopadu 15Ostrava 70833Czech Republic Beijing Graphene Institute(BGI) Beijing 100095China

Among various anode candidates for potassium-ion batteries,carbonaceous materials have attracted significant attention due to their overwhelming advantages including cost-effectiveness and environmental ***,the inferior specific capacity and the sluggish reaction kinetics hinder the further development in this ***,we report biomass templated synthesis of boron/oxygen heteroatom co-doped carbon particles(BO-CPs)via direct plasma-enhanced chemical vapor *** the combined advantages of abundant active sites,large accessible surface area,and functional groups,BO-CP anode exhibits high reversible specific capacity(426.5 mAh g^(-1)at 0.1 A g^(-1))and excellent rate performance(166.5 mAh g^(-1)at 5 A g^(-1)).The K-ion storage mechanism is probed by operando Raman spectroscopy,ex situ X-ray photoelectron spectroscopy/electrochemical impedance spectroscopy,galvanostatic intermittent titration technique measurements,and theoretical *** synergistic effect of boron and oxygen co-doping greatly facilitates the performance of carbon-based anode,wherein boron dopant improves the conductivity of carbon framework and the oxygen dopant affords ample active sites and thus harvests additional specific *** work is anticipated to propel the development of high-performance anode materials for emerging energy storage devices.

关键词： anode B/O co-doping carbon high capacity potassium-ion batteries

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