Die Auswirkung von Druckwellen in der Zuführungsleitung von Vollhubsicherheitsventilen auf das Funktionsverhalten     

Olaf Frommann  Lutz Friedel 《化学，工程师，技术》1997,69(10):1437-1441

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Lars Halbauer  Ralf Eckner  Marco Wendler  Olga Fabrichnaya  Anja Buchwalder  Lutz Krüger  Rolf Zenker  Horst Biermann 《国际钢铁研究》2016,87(12):1627-1637

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Friedrich Tuchscheerer  Lutz Krüger 《国际钢铁研究》2017,88(9)

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Daniel Schwenck  Nils Ellendt  Lutz Mädler  Jörg Fischer-Bühner  Peter Hofmann  Volker Uhlenwinkel 《粉末冶金学》2014,57(3):171-175

Abstract

As part of a project to develop a small batch metal atomisation system, based on free fall atomisation and close-coupled atomisation, the influence of the process parameters on various powder quality features has been investigated, using copper–tin alloys as feedstock material. Particle size distribution, appearance of satellite particles, particle circularity and the flowability were recorded as criteria of particle quality. From the data obtained in these experiments, the effects of the main process parameters (atomisation pressure, mass melt flow, and height of the spray chamber as well as the atomiser system) have been evaluated with respect to powder quality features. The atomisation system was optimised to produce high quality powder with narrow particle distributions (d_84·3/d_50·3?=?1·6 for free fall) and high circularity with mass melt flows in the range of 100 kg h^?1 using melt volume between 100 and 1000 mL.  相似文献   

    

Romaner L  Heimel G  Gruber M  Brédas JL  Zojer E 《Small (Weinheim an der Bergstrasse, Germany)》2006,2(12):1468-1475

Density functional theory (DFT) calculations based on band structure are used to investigate the electromechanical properties of a molecular junction consisting of a dithiolbenzene molecule sandwiched between two gold slabs. This represents a prototypical system for the field of molecular electronics; such a system has previously been studied in break-junction measurements and electron-transport calculations. The stretching and breaking behavior of the junction is analyzed for different geometric conformations, and it is found that the breakage occurs through dissociation of one of the sulfur-gold bonds with a maximum force of 1.25 nN. The molecular electronic states shift during stretching, and, at the point of highest stress in the junction, the highest occupied molecular orbital (HOMO) of the molecule is located exactly at the Fermi level.  相似文献   

    

N. Holstein  V. Piotter  J. Lorenz  E. Oskotski  R. Ruprecht  G. Schanz  J. Hausselt 《Advanced Engineering Materials》2004,6(8):643-653

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F. Appel  U. Brossmann  U. Christoph  S. Eggert  P. Janschek  U. Lorenz  J. Müllauer  M. Oehring  J. D. H. Paul 《Advanced Engineering Materials》2000,2(11):699-720

Intermetallic titanium aluminides offer an attractive combination of low density and good oxidation and ignition resistance with unique mechanical properties. These involve high strength and elastic stiffness with excellent high temperature retention. Thus, they are one of the few classes of emerging materials that have the potential to be used in demanding high‐temperature structural applications whenever specific strength and stiffness are of major concern. However, in order to effectively replace the heavier nickel‐base superalloys currently in use, titanium aluminides must combine a wide range of mechanical property capabilities. Advanced alloy designs are tailored for strength, toughness, creep resistance, and environmental stability. These concerns are addressed in the present paper through global commentary on the physical metallurgy and associated processing technologies of γ‐TiAl‐base alloys. Particular emphasis is paid on recent developments of TiAl alloys with enhanced high‐temperature capability.  相似文献   

    

Marco Wendler  Javad Mola  Lutz Krüger  Andreas Weiß 《国际钢铁研究》2014,85(5):803-810

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Leung MK  Such GK  Johnston AP  Biswas DP  Zhu Z  Yan Y  Lutz JF  Caruso F 《Small (Weinheim an der Bergstrasse, Germany)》2011,7(8):1075-1085

Nano-/micrometer-scaled films and capsules made of low-fouling materials such as poly(ethylene glycol) (PEG) are of interest for drug delivery and tissue engineering applications. Herein, the assembly and degradation of low-fouling, alkyne-functionalized PEG (PEG(Alk) ) multilayer films and capsules, which are prepared by combining layer-by-layer (LbL) assembly and click chemistry, are reported. A nonlinear, temperature-responsive PEG(Alk) is synthesized, and is then used to form hydrogen-bonded multilayers with poly(methacrylic acid) (PMA) at pH 5. The thermoresponsive behavior of PEG(Alk) is exploited to tailor film buildup by adjusting the assembly conditions. Using alkyne-azide click chemistry, PEG(Alk)/PMA multilayers are crosslinked with a bisazide linker that contains a disulfide bond, rendering these films and capsules redox-responsive. At pH 7, by disrupting the hydrogen bonding between the polymers, PEG(Alk) LbL films and PEG(Alk) -based capsules are obtained. These films exhibit specific deconstruction properties under simulated intracellular reducing conditions, but remain stable at physiological pH, suggesting potential applications in controlled drug release. The low-fouling properties of the PEG films are confirmed by incubation with human serum and a blood clot. Additionally, these capsules showed negligible toxicity to human cells.  相似文献   

    

Stöhr M  Wahl M  Spillmann H  Gade LH  Jung TA 《Small (Weinheim an der Bergstrasse, Germany)》2007,3(8):1336-1340

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