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Towards in-situ diagnostics of multi-photon 3D laser printing using optical coherence tomography

Light(Advanced Manufacturing) 2022年第3期3卷 219-233页

作者： Roman Zvagelsky frederik mayer Dominik Beutel Carsten Rockstuhl Guillaume Gomard Martin Wegener Institute of Applied Physics(APH) Karlsruhe Institute of Technology(KIT)76131 KarlsruheGermany Institute of Theoretical Solid State Physics(TFP) Karlsruhe Institute of Technology(KIT)76131 KarlsruheGermany Institute of Nanotechnology(INT) Karlsruhe Institute of Technology(KIT)76344 Eggenstein-LeopoldshafenGermany Carl Zeiss AG Zeiss Innovation HubHermann-von-Helmholtz-Platz 676344 Eggenstein-LeopoldshafenGermany

In recent years,multi-photon 3D laser printing has become a widely used tool for the fabrication of micro-and nanostructures for a large variety of ***,thorough sample characterisation is key for an efficient optimisation of the printing *** date,three-dimensional microscopic inspection has usually been carried out on finished 3D printed microstructures,that is,using ex-situ *** contrast,in-situ 3D characterization tools are desirable for quickly assessing the quality and properties of 3D printed *** these lines,we present and characterise a Fourier-domain optical coherence tomography(FD-OCT)system that can be readily integrated into an existing 3D laser lithography *** demonstrate its capabilities by examining different 3D printed polymer microstructures immersed in a liquid *** such samples,local reflectivity arises from the(refractive-index)contrasts between the polymerised and non-polymerised ***,the refractive index of the printed material can be ***,we demonstrate that the reflectivity of polymer-monomer transitions exhibits time-dependent behaviour after *** by transfer-matrix calculations,we explain this effect in terms of the time-dependent graded-index transition originating from monomer diffusion into the polymer ***,we show exemplary 3D reconstructions of printed structures that can be readily compared with 3D computer designs.

关键词： Multi-photon 3D laser printing Optical coherence tomography In-situ diagnostics

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Beyond the code:the role of histone methylation in cancer resistance and therapy

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Signal Transduction and Targeted Therapy 2024年第7期9卷 2837-2839页

作者： Daniel Noerenberg frederik Damm Charité–Universitätsmedizin Berlin corporate member of Freie Universität BerlinHumboldt Universität zu Berlinand Berlin Institute of HealthDepartment of HematologyOncologyand Cancer ImmunologyBerlinGermany German Cancer Consortium(Deutsches Konsortium für Translationale Krebsforschung DKTK)Partner SiteBerlinGermany

In a recently published paper in Nature,Yamagishi et *** a comprehensive exploration on the mechanistic basis and subsequent emergence of resistance of targeting histone H3 lysine trimethylation(H3K27me3)using the EZH... 详细信息

关键词： EZH2 resistance

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Exploring hemp seed hull biomass for an integrated C-5 biorefinery:Xylose and activated carbon

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Journal of Bioresources and Bioproducts 2024年第3期9卷 310-321页

作者： Sreesha Malayil Luke Loughran frederik Mendoza Ulken Jagannadh Satyavolu Conn Center for Renewable Energy Research University of LouisvilleKentucky 40292United States Bioproducts LLC LouisvilleKentucky 40206United States RTI International Research Triangle ParkNC 27709United States

Large quantities of hemp hulls can be completely utilized for creation of value-added products (cost effective biofuels and biochemicals) through a biorefinery approach. A sustainable approach in making xylose, a low calorie sweetener and high surface area activated carbons (AC) for super capacitors, attracts interest. The AC when leveraged as a co-product from biorefinery process makes it more cost effective and, in this paper, we discuss the production of xylose and AC from hemp seed hull with methane sulphonic acid (MSA) hydrolysis. Xylose recovery with MSA hydrolysis was 25.15 g/L when compared to the traditional sulphuric acid (SA) hydrolysis of 19.96 g/L at the same acid loading of 1.8 %. The scanning electron microscope (SEM) images and Fourier transform infrared (FT-IR) spectra indicate partial delignification along with hemicellulose hydrolysis responsible for high xylose recovery. Post hydrolysis fibers were KOH activated and carbonized to make AC. The MSA hydrolyzed and KOH activated fiber produced pure, fluffier and finer particle AC with a drastic increase in surface area 1 452 m2/g when compared to SA hydrolyzed of 977 m2/g. These results indicate the potential of MSA in dilute acid hydrolysis of biomass for xylose recovery and production of high surface area activated carbon. From a production standpoint this can lead to increased use of sustainable low-cost agricultural biomass for making high surface area AC as components in supercapacitors.

关键词： Xylose C-5 biorefinery Methane sulphonic acid Delignification Activated carbon Dilute acid hydrolysis

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Multi-material multi-photon 3D laser microand nanoprinting

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Light(Advanced Manufacturing) 2021年第3期2卷 14-30页

作者： Liang Yang frederik mayer Uwe H.F.Bunz Eva Blasco Martin Wegener Institute of Nanotechnology Karlsruhe Institute of Technology(KIT)76128 KarlsruheGermany Institute of Applied Physics Karlsruhe Institute of Technology(KIT)76128 KarlsruheGermany Institut für Organische Chemie Ruprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120 HeidelbergGermany Centre for Advanced Materials(CAM) Ruprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 225 and 27069120 HeidelbergGermany

Three-dimensional(3D)laser micro-and nanoprinting based upon multi-photon absorption has made its way from early scientific discovery to industrial manufacturing processes,e.g.,for advanced microoptical ***,so far,most realized 3D architectures are composed of only a single polymeric ***,we review 3D printing of multi-materials on the nano-and *** start with material properties that have been realized,using multi-photon *** materials include bulk polymers,conductive polymers,metals,nanoporous polymers,silica glass,chalcogenide glasses,inorganic single crystals,natural polymers,stimuliresponsive materials,and polymer ***,we review manual and automated processes achieving dissimilar material properties in a single 3D structure by sequentially photo-exposing multiple photoresists as 3D analogs of 2D multicolor *** examples from biology,optics,mechanics,and electronics are *** emerging approach–without counterpart in 2D graphical printing–prints 3D structures combining dissimilar material properties in one 3D structure by using only a single photoresist.A controlled stimulus applied during the 3D printing process defines and determines material properties on the voxel *** of laser power and/or wavelength,or application of quasi-static electric fields allow for the seamless manipulation of desired materials properties.

关键词： properties sequentially struc

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Numerical study of novel OME_(1-6) combustion mechanism and spray combustion at changed ambient environments

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Frontiers in Energy 2024年第4期18卷 483-505页

作者： frederik WIESMANN Zeyan QIU Dong HAN Lukas STRAUβ Sebastian RIEβ Michael WENSING Thomas LAUER Institute of Powertrains and Automotive Technology TU Wien1060 ViennaAustria Key Laboratory for Power Machinery and Engineering of Ministry of Education Shanghai Jiao Tong UniversityShanghai 200240China Professorship for Fluid Systems Technology Friedrich-AlexanderUniversität Erlangen-Nürnberg91058 ErlangenGermany

For a climate-neutral future mobility,the socalled e-fuels can play an essential ***,oxygenated e-fuels containing oxygen in their chemical formula have the additional potential to burn with significantly lower soot *** particular,polyoxymethylene dimethyl ethers or oxymethylene ethers(PODEs or OMEs)do not contain carbon-carbon bonds,prohibiting the production of soot precursors like acetylene(C_(2)H_(2)).These properties make OMEs a highly interesting candidate for future climate-neutral compression-ignition ***,to fully leverage their potential,the auto-ignition process,flame propagation,and mixing regimes of the combustion need to be *** achieve this,efficient oxidation mechanisms suitable for computational fluid dynamics(CFD)calculations must be developed and *** present work aims to highlight the improvements made by developing an adapted oxidation mechanism for OME1-6 and introducing it into a validated spray combustion CFD model for *** simulations were conducted for single-and multi-injection patterns,changing ambient temperatures,and oxygen *** results were validated against high-pressure and high-temperature constantpressure chamber ****-chemiluminescence measurements accomplished the characterization of the auto-ignition *** experiments and simulations were conducted for two different *** improvements concerning the prediction of the ignition delay time were accomplished while also retaining an excellent agreement for the flame lift-off *** spatial zones of high-temperature reaction activity were also affected by the adaption of the reaction *** showed a greater tendency to form OH^(*) radicals within the center of the spray in accordance with the experiments.

关键词： oxygenated fuels reaction kinetics oxidation mechanisms computational fluid dynamics(CFD) oxymethylene ethers(OME) e-fuels multiinjection spray-combustion

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How aromatic dissolved organic matter differs in competitiveness against organic micropollutant adsorption

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Environmental Science and Ecotechnology 2024年第5期21卷 92-102页

作者： Qi Wang Oliver JLechtenfeld Luuk CRietveld Jonas Schuster Mathias Ernst Roberta Hofman-Caris Jan Kaesler Chunmiao Wang Min Yang Jianwei Yu frederik Zietzschmann Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of Sciences100085BeijingChina Delft University of Technology Department of Water ManagementPO Box 50482600GADelftthe Netherlands Department of Analytical Chemistry Research Group BioGeoOmicsHelmholtz Centre for Environmental ResearchUFZPermoserstr.1504318LeipzigGermany Berliner Wasserbetriebe LaboratoryMotardstr.3513629BerlinGermany Institute for Water Resources and Water Supply Hamburg University of TechnologyAm Schwarzenberg-Campus 321073HamburgGermany KWR Watercycle Research Institute 3433PENieuwegeinthe Netherlands ProVISCentre for Chemical Microscopy Helmholtz Centre for Environmental ResearchUFZPermoserstr.1504318LeipzigGermany Wageningen University and Research Department of Environmental TechnologyBornse Weilanden 96708 WGWageningenthe Netherlands University of Chinese Academy of Sciences 100049BeijingChina

Activated carbon is employed for the adsorption of organic micropollutants(OMPs)from water,typically present in concentrations ranging from ng L1 to mg L***,the efficacy of OMP removal is considerably deteriorated due to competitive adsorption from background dissolved organic matter(DOM),present at substantially higher concentrations in mg L*** the characteristics of competitive DOM is crucial in predicting OMP adsorption efficiencies across diverse natural *** weight(MW),aromaticity,and polarity influence DOM *** the aromaticity-related metrics,such as UV254,of low MW DOM were proposed to correlate with DOM competitiveness,the method suffers from limitations in understanding the interplay of polarity and aromaticity in determining DOM ***,we elucidate the intricate influence of aromaticity and polarity in low MW DOM competition,spanning from a fraction level to a compound level,by employing direct sample injection liquid chromatography coupled with ultrahigh-resolution Fouriertransform ion cyclotron resonance mass *** exchange resin pre-treatment eliminated 93%of UV254-active DOM,predominantly aromatic and polar DOM,and only minimally alleviated DOM *** characterization revealed that nonpolar molecular formulas(constituting 26%PAC-adsorbable DOM)with medium aromaticity contributed more to the DOM *** analysis indicated that the competitiveness of highly aromatic LMW DOM compounds was strongly counterbalanced by increased *** aromaticity-derived p-p interaction cannot facilitate the competitive adsorption of hydrophilic DOM *** results underscore the constraints of depending solely on aromaticity-based approaches as the exclusive interpretive measure for DOM *** a broader context,this study demonstrates an effect-oriented DOM analysis,elucidating counterbalancing interactions of DOM molecular properties

关键词： Activated carbon Organic micropollutants Dissolved organic matter(DOM) Multi-component adsorption Fourier-transform ion cyclotron resonance mass spectrometry(FT-ICR-MS)

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测量技术助力实现脱碳目标

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流程工业 2024年第5期 19-21页

作者： Florian Kraftschik frederik Effenberger Endress+Hauser集团

在工业领域,能源转型目标非常明确:使用可再生资源,保证可持续能源供给。即减少化石燃料燃烧产生的二氧化碳排放,甚至实现零排放。工业脱碳技术对测量技术提出了严格且具体的要求。本文概述了过程自动化专家Endress+Hauser如何为这项事... 详细信息

在工业领域,能源转型目标非常明确:使用可再生资源,保证可持续能源供给。即减少化石燃料燃烧产生的二氧化碳排放,甚至实现零排放。工业脱碳技术对测量技术提出了严格且具体的要求。本文概述了过程自动化专家Endress+Hauser如何为这项事业贡献自己的力量。化工行业的能源转型充满挑战,必须抓紧时间积极应对。化石燃料燃烧会产生大量的二氧化碳气体,对环境造成污染,替代需求非常迫切;然而,二氧化碳依然是众多化工生产的基础原材料。可以说,我们面临的能源转型任务复杂而艰巨。

关键词：基础原材料二氧化碳气体可持续能源可再生资源自动化专家能源转型二氧化碳排放化工行业

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Macroalgal deep genomics illuminate multiple paths to aquatic,photosynthetic multicellularity

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Molecular Plant 2024年第5期17卷 747-771页

作者： David R.Nelson Alexandra Mystikou Ashish Jaiswal Cecilia Rad-Menendez Michael J.Preston frederik De Boever Diana C.El Assal Sarah Daakour Michael W.Lomas Jean-Claude Twizere David H.Green William C.Ratcliff Kourosh Salehi-Ashtiani Division of Science and Math New York University Abu DhabiAbu DhabiUAE Center for Genomics and Systems Biology(CGSB) New York University Abu DhabiAbu DhabiUAE Biotechnology Research Center Technology Innovation InstitutePO Box 9639Masdar CityAbu DhabiUAE Culture Collection of Algae and Protozoa Scottish Association for Marine ScienceObanScotlandUK National Center for Marine Algae and Microbiota Bigelow Laboratory for Ocean SciencesEast BoothbayMEUSA Laboratory of Viral Interactomes GIGA InstituteUniversity of LiegeLiegeBelgium School of Biological Sciences Georgia Institute of TechnologyAtlantaGAUSA

Macroalgae are multicellular,aquatic autotrophs that play vital roles in global climate maintenance and have diverse applications in biotechnology and eco-engineering,which are directly linked to their multicellularity ***,their genomic diversity and the evolutionary mechanisms underlying multicellularity in these organisms remain *** this study,we sequenced 110 macroalgal genomes from diverse climates and phyla,and identified key genomic features that distinguish them from their microalgal *** for cell adhesion,extracellular matrix formation,cell polarity,transport,and cell differentiation distinguish macroalgae from microalgae across all three major phyla,constituting conserved and unique gene sets supporting multicellular *** genes show phylum-and climate-specific expansions that may facilitate niche ***,our study reveals genetic determinants of convergent and divergent evolutionary trajectories that have shaped morphological diversity in macroalgae and provides genome-wide frameworks to understand photosynthetic multicellular evolution in aquatic environments.

关键词： macroalgae multicellularity comparative genomics evolution adhesome endogenous viral elements

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Fractals and Spatial Statistics of Point Patterns

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Journal of Earth Science 2013年第1期24卷 1-11页

作者： frederik P Agterberg Geological Survey of Canada 601 Booth Street Ottawa K1A 0E8 Canada

The relationship between fractal point pattern modeling and statistical methods of pa- rameter estimation in point-process modeling is reviewed. Statistical estimation of the cluster fractal dimension by using Ripley＇s K-function has advantages in comparison with the more commonly used methods of box-counting and cluster fractal dimension estimation because it corrects for edge effects, not only for rectangular study areas but also for study areas with curved boundaries determined by re- gional geology. Application of box-counting to estimate the fractal dimension of point patterns has the disadvantage that, in general, it is subject to relatively strong ＂roll-off＂ effects for smaller boxes. Point patterns used for example in this paper are mainly for gold deposits in the Abitibi volcanic belt on the Canadian Shield. Additionally, it is proposed that, worldwide, the local point patterns of podiform Cr, volcanogenic massive sulphide and porphyry copper deposits, which are spatially distributed within irregularly shaped favorable tracts, satisfy the fractal clustering model with similar fractal dimensions. The problem of deposit size （metal tonnage） is also considered. Several examples are provided of cases in which the Pareto distribution provides good results for the largest deposits in metal size-frequency distribution modeling.

关键词： fractal point pattern spatial statistics roll-off effect cluster dimension Pareto distribution.

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Material Engagement Theory and urban formation: Notes towards a theoretical synthesis

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Frontiers of Architectural Research 2022年第4期11卷 630-641页

作者： frederik Weissenborn Gaskin House LondonUK

Material Engagement Theory (MET) theorizes artefacts as the emergent outcomes of non-linear processes of formation in which both human and non-human forms of agency are involved. It has proved a useful framework for exploring the architectural design process – which typically involves the mobilisation of multiple tools and materialities – but has not yet been applied to urban design. This paper argues that MET can be applied to the analysis of urban form, helping explain the distributed processes of urban formation. In sketching out an outline theory of urban material engagement, the paper facilitates a dialogue between MET and two theories of urban morphogenesis – SIRN and Space Syntax theory – which explain formal emergence in the urban surface and the urban grid, respectively. Exploring these theories’ analyses of urban formation – and the relationship between urban form and urban social behaviour – the paper outlines a theoretical synthesis which centres on the artefactual nature of urban form.

关键词： Material Engagement Theory(MET) Space syntax Synergetic Inter-Representation Networks(SIRN) Urban morphogenesis Sciences of the artificial

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