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Single-pulse ultrafast real-time simultaneous planar imaging of femtosecond laser-nanoparticle dynamics in flames

Light(Science & Applications) 2024年第10期13卷 2312-2320页

作者： Yogeshwar Nath Mishra Peng Wang Florian j.bauer Murthy S.Gudipati Lihong V.Wang Caltech Optical Imaging Laboratory Andrew and Peggy Cheng Department of Medical EngineeringDepartment of Electrical EngineeringCalifornia Institute of Technology1200 East California BoulevardMail Code 138-78PasadenaCA 91125USA Science Division Jet Propulsion LaboratoryCalifornia Institute of Technology4800 Oak Grove DrivePasadenaCA 91109USA Lehrstuhl für Technische Thermodynamik(LTT)and Erlangen Graduate School in Advanced Optical Technologies(SAOT) Universität Erlangen-NürnbergErlangen 91058Germany

The creation of carbonaceous nanoparticles and their dynamics in hydrocarbon flames are still debated in environmental,combustion,and material *** this study,we introduce single-pulse femtosecond laser sheetcompressed ultrafast photography(fsLS-CUP),an ultrafast imaging technique specifically designed to shed light on and capture ultrafast dynamics stemming from interactions between femtosecond lasers and nanoparticles in flames in a ***-CUP enables the first-time real-time billion frames-per-second(Gfps)simultaneous twodimensional(2D)imaging of laser-induced fluorescence(LIF)and laser-induced heating(LIH)that are originated from polycyclic aromatic hydrocarbons(PAHs)and soot particles,***,fsLS-CUP provides the real-time spatiotemporal map of femtosecond laser-soot interaction as elastic light scattering(ELS)at an astonishing 250 *** contrast to existing single-shot ultrafast imaging approaches,which are limited to millions of frames per second only and require multiple laser pulses,our method employs only a single pulse and captures the entire dynamics of laserinduced signals at hundreds of *** a single pulse does not change the optical properties of nanoparticles for a following pulse,thus allowing reliable spatiotemporal ***,we found that particle inception and growth are derived from *** essence,as an imaging modality,fsLS-CUP offers ultrafast 2D diagnostics,contributing to the fundamental understanding of nanoparticle’s inception and broader applications across different fields,such as material science and biomedical engineering.

关键词： pulse scattering dynamics

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Single-pulse real-time billion-frames-per-second planar imaging of ultrafast nanoparticle-laser dynamics and temperature in flames

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Light(Science & Applications) 2023年第3期12卷 379-390页

作者： Yogeshwar Nath Mishra Peng Wang Florian j.bauer Yide Zhang Dag Hanstorp Stefan Will Lihong V.Wang Caltech Optical Imaging Laboratory Andrew and Peggy Cherng Department of Medical EngineeringDepartment of Electrical EngineeringCalifornia Institute of Technology1200 East California BoulevardMail Code 138-78PasadenaCA91125USA NASA-jet Propulsion Laboratory California Institute of Technology4800 Oak Grove DrivePasadenaCA91109USA Department of Physics University of GothenburgSE 41296GothenburgSweden Institute of Engineering Thermodynamics(LTT)and Erlangen Graduate School in Advanced Optical Technologies(SAOT) Friedrich-Alexander-Universität Erlangen-Nürnberg(FAU)91058ErlangenGermany

Unburnt hydrocarbon flames produce soot,which is the second biggest contributor to global warming and harmful to human *** state-of-the-art high-speed imaging techniques,developed to study non-repeatable turbulent flames,are limited to million-frames-per-second imaging rates,falling short in capturing the dynamics of critical ***,these techniques do not provide a complete picture of flame-laser interactions,important for understanding soot ***,thermal effects induced by multiple consecutive pulses modify the optical properties of soot nanoparticles,thus making single-pulse imaging ***,we report single-shot laser-sheet compressed ultrafast photography(LS-CUP)for billion-frames-per-second planar imaging of flame-laser *** observed laser-induced incandescence,elastic light scattering,and fluorescence of soot precursors-polycyclic aromatic hydrocarbons(PAHs)in real-time using a single nanosecond laser *** spatiotemporal maps of the PAHs emission,soot temperature,primary nanoparticle size,soot aggregate size,and the number of monomers,present strong experimental evidence in support of the theory and modeling of soot inception and growth mechanism in ***-CUP represents a generic and indispensable tool that combines a portfolio of ultrafast combustion diagnostic techniques,covering the entire lifecycle of soot nanoparticles,for probing extremely short-lived(picoseconds to nanoseconds)species in the spatiotemporal domain in non-repeatable turbulent ***,LS-CUP’s unparalleled capability of ultrafast wide-field temperature imaging in real-time is envisioned to unravel mysteries in modern physics such as hot plasma, sonoluminescence, and nuclear fusion.

关键词： dynamics pulse turbulent

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Magnetic field sensors using arrays of electrospun magnetoelectric janus nanowires

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Microsystems & Nanoengineering 2018年第1期4卷 24-35页

作者： Matthew j.bauer Xiao Wen Prabal Tiwari David P.Arnold jennifer S.Andrew Dept.of Materials Science and Engineering University of FloridaGainesvilleFL 32611-6400USA Dept.of Electrical and Computer Engineering University of FloridaGainesvilleFL 32611-6200USA

The fabrication and characterization of the first magnetoelectric sensors utilizing arrays of janus magnetoelectric composite nanowires composed of barium titanate and cobalt ferrite are *** utilizing magnetoelectric nanowires suspended across electrodes above the substrate,substrate clamping is reduced when compared to layered thin-film architectures;this results in enhanced magnetoelectric *** magnetoelectric nanowires are fabricated by sol–gel electrospinning,and their length is controlled through the electrospinning and calcination *** a directed nanomanufacturing approach,the nanowires are then assembled onto pre-patterned metal electrodes on a silicon substrate using *** this process,functional magnetic field sensors are formed by connecting many nanowires in *** observed magnetic field sensitivity from the parallel array of nanowires is 0.514±.027mV Oe^(−1) at 1 kHz,which translates to a magnetoelectric coefficient of 514±27mV cm^(−1) Oe^(−1).

关键词： nanowires composite utilizing

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A facile strategy for tuning the density of surface-grafted biomolecules for melt extrusion-based additive manufacturing applications

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Bio-Design and Manufacturing 2024年第3期7卷 277-291页

作者： I.A.O.Beeren G.Dos Santos P.j.Dijkstra C.Mota j.bauer H.Ferreira Rui L.Reis N.Neves S.Camarero-Espinosa M.B.Baker L.Moroni Department of Complex Tissue Regeneration MERLN Institute for Technology-Inspired Regenerative MedicineMaastricht University6229 ER MaastrichtThe Netherlands 3B’s Research Group I3Bs–Research Institute on BiomaterialsBiodegradables and BiomimeticsHeadquarters of the European Institute of Excellence on Tissue Engineering and Regenerative MedicineUniversity of MinhoAveParkZona Industrial da Gandra4805-017 BarcoGuimarãesPortugal ICVS/3B’s-PT Government Associate Laboratory 4806-909 Braga/GuimarãesPortugal POLYMAT University of the Basque Country UPV/EHU20018 Donostia/San SebastiánSpain IKERBASQUE Basque Foundation for Science48009 BilbaoSpain

Melt extrusion-based additive manufacturing(ME-AM)is a promising technique to fabricate porous scaffolds for tissue engi-neering ***,most synthetic semicrystalline polymers do not possess the intrinsic biological activity required to control cell *** of biomolecules on polymeric surfaces of AM scaffolds enhances the bioactivity of a construct;however,there are limited strategies available to control the surface ***,we report a strategy to tune the surface density of bioactive groups by blending a low molecular weight poly(ε-caprolactone)5k(PCL5k)containing orthogonally reactive azide groups with an unfunctionalized high molecular weight PCL75k at different *** porous three-dimensional(3D)scaf-folds were then fabricated using a high weight percentage(75 wt.%)of the low molecular weight PCL *** a proof-of-concept test,we prepared films of three different mass ratios of low and high molecular weight polymers with a thermopress and reacted with an alkynated fluorescent model compound on the surface,yielding a density of 201-561 pmol/cm^(2).Subsequently,a bone morphogenetic protein 2(BMP-2)-derived peptide was grafted onto the films comprising different blend compositions,and the effect of peptide surface density on the osteogenic differentiation of human mesenchymal stromal cells(hMSCs)was *** two weeks of culturing in a basic medium,cells expressed higher levels of BMP receptor II(BMPRII)on films with the conjugated *** addition,we found that alkaline phosphatase activity was only significantly enhanced on films contain-ing the highest peptide density(i.e.,561 pmol/cm^(2)),indicating the importance of the surface *** together,these results emphasize that the density of surface peptides on cell differentiation must be considered at the cell-material ***,we have presented a viable strategy for ME-AM community that desires to tune the bulk and surface functionality via blending of(m

关键词： Additive manufacturing Blending Surface functionalization Surface density Click chemistry Human

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利用双电极装置提高等电聚焦通量

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生命科学仪器 2011年第6期9卷 28-29页

作者： Gary B.SMEjKAL Darren j.bauer the Hubbard Center for Genome Studies University of New Hampshire

在最大电压12 000 V下操作,蛋白质在固定pH梯度(IPGs)上的等电聚集(IEF)可以在3 h内完成。采用改装的电极装置,将两电极对通过线路并联,可使IEF的通量加倍。、与常规的单电极对相比,成对的IPGs的电压梯度几乎一致,并在大致两倍的电流下... 详细信息

在最大电压12 000 V下操作,蛋白质在固定pH梯度(IPGs)上的等电聚集(IEF)可以在3 h内完成。采用改装的电极装置,将两电极对通过线路并联,可使IEF的通量加倍。、与常规的单电极对相比,成对的IPGs的电压梯度几乎一致,并在大致两倍的电流下运行,IEF可在大致相同的时间内完成。

关键词：双电极等电聚焦通量装置利用电压梯度 pH梯度电极对

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含植物油和亲脂性维生素的纤维素纤维新应用

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国际纺织导报 2014年第11期42卷 4-7,6页

作者： F.Meister M.Krieg j.bauer M.Sellin P.Brückner 赵华蕾图林根纺织和塑料研究所

纤维素的干湿法成形为再生纤维材料的物理、化学功能化提供了独特的选择。这使得基于功能纤维素的新型纤维在20世纪得以成功研发,并在市场上商业化,市场也对含有液体或可熔性亲脂化合物的纤维提出了新需求。图林根纺织和塑料研究所(TITK... 详细信息

纤维素的干湿法成形为再生纤维材料的物理、化学功能化提供了独特的选择。这使得基于功能纤维素的新型纤维在20世纪得以成功研发,并在市场上商业化,市场也对含有液体或可熔性亲脂化合物的纤维提出了新需求。图林根纺织和塑料研究所(TITK)最近研发了一种包含永久性嵌入植物油或维生素的纤维素纤维,它们将打开护肤纺织品新的应用篇章。

关键词：植物油维生素纤维素纤维应用

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解释结核分枝杆菌DNA指纹簇

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国际结核病与肺部疾病杂志 2000年第1期3卷 4-9页

作者： j.R.Glynn j.bauer A.S.deBoer M.W.Borgdorff P.E.M.Fine P.Godfrey-Faussett E.Vynnycky 丁北川 Department of Infectious and Tropical Diseases London School of Hygiene and Tropical Medicine Keppel St LondonUK Department of Mycobacteriology Statens Serum Institut Copenhagen Denmark National Institute of Public Health and the Environment Bilthoven Royal Netherlands Tuberculosis Association The Hague The Netherlands Department of Infectious and Tropical Diseases London School of Hygiene and Tropical Medicine Keppel St London UK European Concerted Actionon Molecular Epidemiology Control of Tuberculosis

许多研究已在其结核分枝杆菌分离株共享DNA指纹的基础上定义了患者簇。成簇相当于最近的传播,并且对伴随结核分枝杆菌正在高度传播人群亚组来说,与成簇有关的因素已作为指标被找出。在进行和解释这些研究中值得考虑的提醒应予以注意。例... 详细信息

许多研究已在其结核分枝杆菌分离株共享DNA指纹的基础上定义了患者簇。成簇相当于最近的传播,并且对伴随结核分枝杆菌正在高度传播人群亚组来说,与成簇有关的因素已作为指标被找出。在进行和解释这些研究中值得考虑的提醒应予以注意。例如,根据标志物的稳定性和长时间在人群中的菌株数量,某些并非近期传播的原因使菌株组可能完全相同。如果病例对特定人群是新移民或在研究中不是所有人群中的病例都被包括的话,确定由近期传播引发的病例可能不作为成簇被见到。所见的成簇数量将根据研究持续的时间。在研究的设计、所包括病例的比例、补充和所使用成簇的界定上,研究应给出精确的资料。成簇的数据应至少被年龄、性别和移民状况分开。为了最大的获得信息,研究应涉及一个人群中所有病例的高比例、与传统的流行病学接触调查结合进行(如果可能的话)、并且提供人群中结核病发病资料和患者的年龄、性别、人类免疫缺损病毒状况、耐药性及社会和种族组资料。关键词:结核病;分子流行病学;DNA指纹;RFLP;传播;

关键词：结核分枝杆菌 tuberculosis DNA指纹 Mycobacterium 成簇流行病学 Tropic 菌株结核病时间窗口

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在实验装置中采用多排探测器CT检测肠道出血,需要采集几种时相的数据?

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国际医学放射学杂志 2010年第1期 97-97页

作者： M.Dobritz H.P.Engels A.Schneider j.bauer E.Rummeny 朱晖 Department of Radiology Technische Universitt MünchenMunichGermany

本项研究的目的是评价多排探测器CT(MDCT)不同时期采集(平扫、动脉期和门脉期)于实验肠道模型上检测肠道出血的价值。该模型由7米长的猪小肠,及钻孔连接的注射管组成。肠管充盈水或密度为30～40HU的对比剂溶液并放置于模型内。模仿不同... 详细信息

本项研究的目的是评价多排探测器CT(MDCT)不同时期采集(平扫、动脉期和门脉期)于实验肠道模型上检测肠道出血的价值。该模型由7米长的猪小肠,及钻孔连接的注射管组成。肠管充盈水或密度为30～40HU的对比剂溶液并放置于模型内。模仿不同的出血部位和从0～0.75mL/min的不同速率出血

关键词：肠道出血门脉期动脉期 CT 多排探测器时相

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Sediment generation and soil mound denudation in areas of high-density tree throw along a river valley in the jura Mountains, Switzerland

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journal of Mountain Science 2021年第2期18卷 377-391页

作者： Philip GREENWOOD jan bauer Nikolaus j KUHN Physical Geography&Environmental Change Research Group Department of Environmental SciencesUniversity of BaselKlingelbergstrasse 27Basel-4056Switzerland

A preliminary field-based investigation was undertaken in a small(<10 km^(2))river valley located in the mountainous jura region of northwest *** aims of the work were to assess sediment generation and annual sediment... 详细信息

A preliminary field-based investigation was undertaken in a small(jura region of northwest *** aims of the work were to assess sediment generation and annual sediment transport rates by tree throw on forested hillslopes,and to document surface hydrology characteristics on four fresh soil mounds associated with recent tree throws over a 24-day monitoring *** the soil mounds,average sediment recovery ranged from 7.7-28.2 g(dry weight),equivalent to a suspended sediment concentration of 145.2-327.8 g L^(-1),and runoff coefficients ranged from 1.0%-4.2%.Based on a soil bulk density value of 1,044 kg m^(-3),upslope runoff generation areas were denuded by an average 0.14 mm by the end of the 24-day monitoring period,representing an erosion rate equivalent to 2.1 mm yr^(-1).A ca.50 cm high soil mound could therefore feasibly persist for around 200-250 *** tree throw work,the dimensions of 215 individual tree throws were measured and their locations mapped in 12 separate locations along the river valley representing a cumulative area equivalent to 5.3 ha(***,43 per ha).Tree throws generated a total of 20.1 m^(3) of fine-sediment(jority of tree throws,but instead,could be associated with root *** the high density of tree throws and their relative maturity(average age 41 years),we hypothesise that once tr

关键词： Tree throw Hillslope processes Sediment generation mechanism Sediment transport rate Soil mound Ibach river valley

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Progress in Research and Development of Molten Chloride Salt Technology for Next Generation Concentrated Solar Power Plants

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Engineering 2021年第3期7卷 334-347页

作者： Wenjin Ding Thomas bauer Institute of Engineering Thermodynamics German Aerospace Center(DLR) Suttgart 70569Germany Institute of Enginering Thermodynamics Cemman Aerospace Center(DL.R)Cologne 51147Germany

Concentrated solar power(CSP)plants with thermal energy storage(TES)system are emerging as one kind of the most promising power plants in the future renewable energy system,since they can supply dispatchable and low-cost electricity with abundant but intermittent solar *** order to significantly reduce the levelized cost of electricity(LCOE)of the present commercial CSP plants,the next generation CSP technology with higher process temperature and energy efficiency is being *** TES system in the next generation CSP plants works with new TES materials at higher temperatures(>565℃)compared to that with the commercial nitrate salt *** paper reviews recent progressin research and development of the next generation CSP and TES *** is given on theadvanced'TES technology based on molten chloride salt mixtures such as MgCl_(2)/NaCl/KCl which hassimilar thermo-physical properties as the commercial nitrate salt mixtures,higher thermal stability(>800℃),and lower costs(<0.35USD·kg^(-1)).Recent progress in the selection/optimization of chloridesalts,determination of molten chloride salt properties,and corrosion control of construction materials(eg.,alloys)in molten chlorides is reviewed.

关键词： Solar energy Concentrated solarpower(CSP) Thermal energystorage(TES) Heat transferfluid(HTF) Supercritical carbondioxide(sCO2)power cycle Corrosion control

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