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排序方式: 共有548条查询结果,搜索用时 171 毫秒
541.
Juliane Moritz Mirko Teschke Axel Marquardt Lukas Stepien Elena López Frank Brueckner Frank Walther Christoph Leyens 《Advanced Engineering Materials》2023,25(2):2200917
Electron beam powder bed fusion (PBF-EB/M) has been attracting great research interest as a promising technology for additive manufacturing of titanium aluminide alloys. However, challenges often arise from the process-induced evaporation of aluminum, which is linked to the PBF-EB/M process parameters. This study applies different volumetric energy densities during PBF-EB/M processing to deliberately adjust the aluminum contents in additively manufactured Ti–43.5Al–4Nb–1Mo–0.1B (TNM-B1) samples. The specimens are subsequently subjected to hot isostatic pressing (HIP) and a two-step heat treatment. The influence of process parameter variation and heat treatments on microstructure and defect distribution are investigated using optical and scanning electron microscopy, as well as X-ray computed tomography (CT). Depending on the aluminum content, shifts in the phase transition temperatures can be identified via differential scanning calorimetry (DSC). It is confirmed that the microstructure after heat treatment is strongly linked to the PBF-EB/M parameters and the associated aluminum evaporation. The feasibility of producing locally adapted microstructures within one component through process parameter variation and subsequent heat treatment can be demonstrated. Thus, fully lamellar and nearly lamellar microstructures in two adjacent component areas can be adjusted, respectively. 相似文献
542.
543.
Piero Mazzolini Zsolt Fogarassy Antonella Parisini Francesco Mezzadri David Diercks Matteo Bosi Luca Seravalli Anna Sacchi Giulia Spaggiari Danilo Bersani Oliver Bierwagen Benjamin Moritz Janzen Marcella Naomi Marggraf Markus R. Wagner Ildiko Cora Béla Pécz Abbes Tahraoui Alessio Bosio Carmine Borelli Stefano Leone Roberto Fornari 《Advanced functional materials》2023,33(2):2207821
Unintentionally doped (001)-oriented orthorhombic κ-Ga2O3 epitaxial films on c-plane sapphire substrates are characterized by the presence of ≈ 10 nm wide columnar rotational domains that can severely inhibit in-plane electronic conduction. Comparing the in- and out-of-plane resistance on well-defined sample geometries, it is experimentally proved that the in-plane resistivity is at least ten times higher than the out-of-plane one. The introduction of silane during metal-organic vapor phase epitaxial growth not only allows for n-type Si extrinsic doping, but also results in the increase of more than one order of magnitude in the domain size (up to ≈ 300 nm) and mobility (highest µ ≈ 10 cm2V−1s−1, with corresponding lowest ρ ≈ 0.2 Ωcm). To qualitatively compare the mean domain dimension in κ-Ga2O3 epitaxial films, non-destructive experimental procedures are provided based on X-ray diffraction and Raman spectroscopy. The results of this study pave the way to significantly improved in-plane conduction in κ-Ga2O3 and its possible breakthrough in new generation electronics. The set of cross-linked experimental techniques and corresponding interpretation here proposed can apply to a wide range of material systems that suffer/benefit from domain-related functional properties. 相似文献
544.
Moritz Kränzlein Thomas M. Pehl Kerstin Halama Paula F. Großmann Tim Kratky Amelie M. Mühlbach Bernhard Rieger 《大分子材料与工程》2023,308(6):2200635
Rare-earth metal-mediated group-transfer polymerization (REM-GTP) offers distinctive features over common polymerization techniques, such as living character, a broad scope of functional monomers, high activity, excellent control of the polymeric parameters as well as inherent chain-end functionalization. Through the latter, polymers with reactive end-groups become feasible, opening the pathway for further post-polymerization functionalization. In this study, a straightforward graft-to immobilization of the Michael-type polymer poly(diethyl vinylphosphonate) (PDEVP) on multi-walled carbon nanotubes (MWCNT) is reported. Hence, a customized azide initiator is synthesized and studied in the C H bond activation with various lanthanide-based catalysts and the subsequent polymerization of diethyl vinylphosphonate (DEVP). The successful attachment of the azide end-group is demonstrated via electrospray ionization mass spectrometry (ESI-MS) and the synthesized polymers are subjected to immobilization on multi-walled carbon nanotubes in a graft-to approach. The prepared MWCNT:PDEVP composites are analyzed via thermogravimetric analysis (TGA), elemental analysis (EA), Raman spectroscopy, X-Ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM) and the versatility of this approach is shown via the stabilization of MWCNT dispersions in water. 相似文献
545.
Ayse Sünbül David Lehninger Raik Hoffmann Ricardo Olivo Aditya Prabhu Fred Schöne Kati Kühnel Moritz Döllgast Nora Haufe Lisa Roy Thomas Kämpfe Konrad Seidel Lukas M. Eng 《Advanced Engineering Materials》2023,25(4):2201124
Due to its ferroelectricity, hafnium oxide has attracted a lot of attention for ferroelectric memory devices. Amongst different dopant elements, zirconium is found to be beneficial due to the relatively low crystallization temperature of hafnium-zirconium-oxide (HZO), thus it is back-end-of-line (BEoL) compatible. The thickness of HZO has a significant impact on ferroelectric device reliability. High operation temperatures and high endurance are important criteria depending on the application. Herein, various HZO thicknesses (7, 8, and 10 nm) in MFM (metal-ferroelectric-metal) capacitors are investigated at varying operation temperatures (25 to 175 °C) at varying electric fields (±3 to ±5.4 MV cm−1) with respect to polarization, leakage current, endurance, and retention. 7 nm HZO showed promising results with an endurance of 107 cycles, with a low leakage current density, and almost no retention loss after 10 years. Extrapolated results at operation conditions (±2 MV cm−1 and 10 MHz) showed an endurance of 1010 cycles. 相似文献
546.
Markus Schleuning Moritz Kölbach Ibbi Ahmet Raphael Präg Ronen Gottesman René Gunder Mengyuan Zhang Dan Ralf Wargulski Daniel Abou-Ras Daniel A. Grave Fatwa F. Abdi Roel van de Krol Klaus Schwarzburg Rainer Eichberger Dennis Friedrich Hannes Hempel 《Advanced functional materials》2023,33(25):2300065
Metal oxides are considered as stable and low-cost photoelectrode candidates for hydrogen production by photoelectrochemical solar water splitting. However, their power conversion efficiencies usually suffer from poor transport of photogenerated charge carriers, which has been attributed previously to a variety of effects occurring on different time and length scales. In search for common understanding and for a better photo-conducting metal oxide photoabsorber, CuFeO2, α-SnWO4, BaSnO3, FeVO4, CuBi2O4, α-Fe2O3, and BiVO4 are compared. Their kinetics of thermalization, trapping, localization, and recombination are monitored continuously 100 fs–100 µs and mobilities are determined for different probing lengths by combined time-resolved terahertz and microwave spectroscopy. As common issue, we find small mobilities < 3 cm2V-1s-1. Partial carrier localization further slows carrier diffusion beyond localization lengths of 1–6 nm and explains the extraordinarily long conductivity tails, which should not be taken as a sign of long diffusion lengths. For CuFeO2, the localization is attributed to electrostatic barriers that enclose the crystallographic domains. The most promising novel material is BaSnO3, which exhibits the highest mobility after reducing carrier localization by annealing in H2. Such overcoming of carrier localization should be an objective of future efforts to enhance charge transport in metal oxides. 相似文献
547.
Rayer Moritz Wilkowski Moritz Schiffers Reinhard Stephan Jens 《Forschung im Ingenieurwesen》2023,87(2):581-591
Forschung im Ingenieurwesen - In diesem Beitrag wird Einblick in die Produktentwicklung einer neuartigen Faserverbundantriebswelle in Leichtbauweise gegeben. Durch eine hybride Bauweise aus... 相似文献
548.
Sumit Shekhar Max Reimann Moritz Hilscher Amir Semmo Jürgen Döllner Matthias Trapp 《Computer Graphics Forum》2023,42(4):e14891
Image stylization has seen significant advancement and widespread interest over the years, leading to the development of a multitude of techniques. Extending these stylization techniques, such as Neural Style Transfer (NST), to videos is often achieved by applying them on a per-frame basis. However, per-frame stylization usually lacks temporal consistency, expressed by undesirable flickering artifacts. Most of the existing approaches for enforcing temporal consistency suffer from one or more of the following drawbacks: They (1) are only suitable for a limited range of techniques, (2) do not support online processing as they require the complete video as input, (3) cannot provide consistency for the task of stylization, or (4) do not provide interactive consistency control. Domain-agnostic techniques for temporal consistency aim to eradicate flickering completely but typically disregard aesthetic aspects. For stylization tasks, however, consistency control is an essential requirement as a certain amount of flickering adds to the artistic look and feel. Moreover, making this control interactive is paramount from a usability perspective. To achieve the above requirements, we propose an approach that stylizes video streams in real-time at full HD resolutions while providing interactive consistency control. We develop a lite optical-flow network that operates at 80 Frames per second (FPS) on desktop systems with sufficient accuracy. Further, we employ an adaptive combination of local and global consistency features and enable interactive selection between them. Objective and subjective evaluations demonstrate that our method is superior to state-of-the-art video consistency approaches. maxreimann.github.io/stream-consistency 相似文献