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Browsing by browse.metadata.tuhhjournals "AIP conference proceedings"

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    A new strategy for stiffness evaluation of sheet metal parts
    (AIP, 2011)
    Cai, Q.  
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    Volk, Wolfram  
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    Düster, Alexander  
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    Rank, Ernst  
    Publicationtype: Conference Paper
    Citation Publisher Version:The 8th International Conference and Workshop on Numerical Simulation of 3d Sheet Metal Forming Processes (NUMISHEET 2011) : Seoul, Republic of Korea, 21-26 August 2011. - (AIP conference proceedings; Vol. 1383, issue 1): pp. 526-532 (2011)
    Publisher DOI:10.1063/1.3623653
      29
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    Adsorption of laminaribiose in an in-situ product recovery process
    (American Institut of Physics, 2011)
    Waluga, Thomas  
    ;
    Scholl, Stephan  
    With the decreasing availability of fossil carbon sources new synthesis routes for pharmaceuticals and finechemicals find growing interest. Higher oligosaccharide laminaribiose can be produced by enzymatic synthesis from inexpensive sucrose. For an economic process an in-situ product removal by adsorption is investigated. BEA 50 zeolite shows high potential for application due to its good adsorption properties. Isotherms show Langmuir behavior and adequate loadings of nearly 100 mg · g-1 can be reached. Other intermediates formed during the process do not adsorb on this zeolite or show weaker adsorption. Further thermal desorption can be used to regain laminaribiose. However the use of BEA 50 zeolite needs a sophisticated desorption process because of the zeolites' high acidity which catalyzes the degradation of laminaribiose. Hence lower temperatures have to be used or combined with displacement desorption. © 2012 American Institute of Physics.
    Publicationtype: Journal Article
    Citation Publisher Version:AIP Conference Proceedings 1 (1453): 271-275 (2011)
    Publisher DOI:10.1063/1.4711187
      90
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    Development of a colored GFRP with antistatic properties
    (AIP Publishing, 2019)
    Meeuw, Hauke  orcid-logo
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    Radek, Markus  
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    Fiedler, Bodo  orcid-logo
    This study shows that a modification with ultralow filler content of novel single wall carbon nanotubes (SWCNT) converts an intrinsic insulating GFRP into one with antistatic properties. These properties remain even by adding pigments for customizing without affecting the wanted bright coloring (e.g. signal color). We developed a bright colored and antistatic glass fiber reinforced polymer (GFRP) by addition of carbon nanoparticle and pigments. Novel, in industrial scale available SWCNT dispersed in polyester resin with low content of volatile organic compounds (VOC) show an ultra-low percolation threshold of 0.005wt.%. This ultralow filler content leads to the required conductivity as well as a given transparency of the nano composite. In a next step, we transferred these properties into a GFRP, manufactured by infusion process. The addition of pigments lead to the individual coloring of the GFRP. Both, the SWCNT modified and SWCNT colorized GFRP fulfilled the required electrical resistances for ESD protection.
    Publicationtype: Conference Paper
    TORE-DOI:10.15480/882.1733
    Citation Publisher Version:AIP Conference Proceedings 2055, 090007 (2019)
    Publisher DOI:10.1063/1.5084885
    Scopus© Citations 2  556  758
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    Identification of micro parameters for discrete element simulation of agglomerates
    (American Institute of Physics, 2013-06-18)
    Palis, Stefan  
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    Antonyuk, Sergiy  
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    Dosta, Maksym  
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    Heinrich, Stefan  
    The mechanical behaviour of solid particles like agglomerates, granules or crystals strongly depends on their micro structure, e.g. structural defects and porosity. In order to model the mechanical behaviour of these inhomogeneous media the discrete element method has been proven to be an appropriate tool. The model parameters used are typically micro parameters like bond stiffness, particle-particle contact stiffness, strength of the bonds. Due to the lack of general methods for a direct micro parameter determination, normally laborious parameter adaptation has to be done in order to fit experiment and simulation. In this contribution a systematic and automatic way for parameter adaptation using real experiments is proposed. Due to the fact, that discrete element models are typically systems of differential equations of very high order, gradient based methods are not suitable. Hence, the focus will be on derivative free methods. © 2013 AIP Publishing LLC.
    Publicationtype: Conference Paper
    Citation Publisher Version:AIP Conference Proceedings (1542): 871-874 (2013)
    Publisher DOI:10.1063/1.4812070
      109
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    Layout and first results of the nanotomography endstation at the P05 beamline at PETRA III
    (American Institute of Physics, 2016-01-28)
    Ogurreck, Malte  
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    Greving, Imke  
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    Marschall, Felix  
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    Vogt, Harald  
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    Last, Arndt  
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    Rosário, Jefferson J. do  
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    Leib, Elisabeth  
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    Beckmann, Felix  
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    Wilde, Fabian  
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    Müller, Martin  
    The Helmholtz-Zentrum Geesthacht operates the P05 Imaging Beamline at the DESY storage ring PETRA III. This beamline is dedicated to micro-and nanotomography with two endstations. This paper will present the nanotomography endstation layout and first results obtained from commissioning and test experiments. First tests have been performed with CRLs as X-ray objectives and newly developed rolled X-ray prism lenses as condenser optics. This setup allows a resolution of 100nm half period with an effective detector pixel size of 15nm. A first tomograph of a photonic glass sample was measured in early 2014.
    Publicationtype: Conference Paper
    Citation Publisher Version:AIP Conference Proceedings (1696): 020008 (2016-01-28)
    Publisher DOI:10.1063/1.4937502
      168
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    Novel multiscale simulation environment for modeling of fluidized bed granulation
    (American Institute of Physics, 2013)
    Dosta, Maksym  
    ;
    Heinrich, Stefan  
    In this contribution the architecture of a novel simulation environment, which has been developedfor the multiscale modeling of fluidized bed spray granulation, is presented. The novel environment describes the granulation process on four different time and length scales. On the one hand, it allows to predict dynamics of the global production process, whereby, on the other hand, material properties can be considered. © 2013 AIP Publishing LLC.
    Publicationtype: Conference Paper
    Citation Publisher Version:AIP Conference Proceedings (1542): 1126-1129 (2013)
    Publisher DOI:10.1063/1.4812134
      70
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    Numerical estimation of the restitution coefficient for dry and wet agglomerates
    (American Institute of Physics, 2013-06-18)
    Antonyuk, Sergiy  
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    Dosta, Maksym  
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    Heinrich, Stefan  
    In this contribution a novel simulation tool, which is able to predict the agglomerate deformation and breakage during different loading conditions, was developed. This simulation system is based on the Discrete Element Method (DEM). For a better understanding of the soft, non-elastic deformation behaviour of wet and dry agglomerates, the models of liquid and solid bridges have been implemented in the DEM to perform a detailed simulation. As a result, the dependency of the restitution coefficient on the viscosity of the binder, impact velocity and agglomerate size and shape were obtained. © 2013 AIP Publishing LLC.
    Publicationtype: Conference Paper
    Citation Publisher Version:AIP Conference Proceedings (1542): 951-954 (2013)
    Publisher DOI:10.1063/1.4812090
      121
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    Particle dynamics in the fluidized bed : magnetic particle tracking and discrete particle modelling
    (American Institute of Physics, 2013-06-18)
    Neuwirth, Johannes  
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    Antonyuk, Sergiy  
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    Heinrich, Stefan  
    In this contribution, the particle dynamics and the granular flow in a lab-scaled rotor granulator system (fluid bed rotor processor) are investigated on the scale of individual particles. The numerical approach is based on a Discrete Element Method (DEM) coupled with three-dimensional Computational Fluid Dynamics (CFD) for the gas phase. In this work a novel non-intrusive particle tracking technique, the Magnetic Particle Tracking (MPT) has been used to study the complex granular flow in rotor granulators. The technique allows a simultaneously and non-intrusivedescription of the translational as well as the rotational movement of a tracer particle in dense granular flow. The focus is on the analysis of the particle rotation behaviour at different process conditions. © 2013 AIP Publishing LLC.
    Publicationtype: Conference Paper
    TORE-DOI:10.15480/882.2841
    Citation Publisher Version:AIP Conference Proceedings (1542): 1098-1101 (2013)
    Publisher DOI:10.1063/1.4812127
    Scopus© Citations 6  168  1
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    Recovery of rare earth elements (REEs) from uranium containing solutions using biosorption
    (AIP Publishing, 2017)
    Botalov, Maxim  
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    Bunkov, Grigory  
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    Rychkov, Vladimir  
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    Kirillov, Evgeny  
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    Kirillov, Sergey  
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    Kuchta, Kerstin  orcid-logo
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    Kücüker, Mehmet Ali  
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    Atamaniuk, Iryna  
    Batch testing and determination of appropriate biosorbent and experimental procedures for recovery of REEs from artificial solution as well as the efficiency of the process for recovery of REEs from artificial solution via biosorption are given in present research work.
    Publicationtype: Conference Paper
    Citation Publisher Version:AIP Conference Proceedings (1886): 020033 (2017)
    Publisher DOI:10.1063/1.5002930
      242
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    Vibro-acoustic amplitude and frequency modulations during fatigue damage evolution
    (2019-05-08)
    Donskoy, Dimitri  
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    Golchinfar, Behnoush  
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    Ramezani, Majid  
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    Rutner, Marcus  
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    Hassiotis, Sophia  
    Vibro-Acoustic Modulation method (VAM) utilizes effect of the nonlinear interaction between higher frequency ultrasonic wave (carrier signal) and much lower frequency structural vibration (modulating signal). This interaction is taken place at the nonlinear interfaces (cracks, bolted connections, delaminations, etc.) manifesting itself in the spectrum as side-band components around the carrier. There are numerous studies applying VAM for nondestructive testing and structural health monitoring. Most of them utilize resonance structural bending vibrations as the modulating signal and measure a ratio of sideband to carrier spectral components defined as Modulation Index (MI). The present VAM study utilizes in-plane non-resonance very low frequency (10 Hz) tensile oscillations for monitoring fatigue and stress-corrosion damage evolution in steel. Experiments consistently demonstrated significant increase in MI during 70% - 80% of the fatigue life. Additionally, newly developed algorithm separates Amplitude and Frequency Modulations during the damage evolution demonstrating FM dominance at initial micro-crack growth stages and transition to AM dominance during macro-crack formation.
    Publicationtype: Conference Paper
    Citation Publisher Version:AIP Conference Proceedings (2102): 040004 (2019-05-08)
    Publisher DOI:10.1063/1.5099754
      309  1
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