3 research outputs found

    Photocatalytic, corrosion protection and adhesion properties of acrylic nanocomposite coating containing silane treated nano zinc oxide: A combined experimental and simulation study

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    The influence of silane treated nano zinc oxide (nZnO) on the protection, photocatalytic properties and interfacial interactions in acrylic/carbon steel systems was investigated. For this purpose, nZnO particles have been synthesized using microwave irradiation method. The morphology of synthesized zinc oxide nanoparticles was studied by scanning electron microscopy (SEM). The nZnO were treated by 3(2-amino ethyl amino) propyl trimethoxysilane. Fourier transforms infrared spectroscopy (FTIR) and thermogravimetry (TGA) techniques have been used to prove success of nZnO surface modification. In the next step, nanocomposites were prepared and coated on carbon steel by dip-coating method. Corrosion resistances of coatings were evaluated by electrochemical impedance spectroscopy (EIS). Field emission scanning electron microscopy (FE-SEM) has been carried out to study morphology of cross section of films. Moreover, to study the hydrophillicity and photocatalytic properties of coating surface, contact angle of the nanocomposites coating surface have been measured. Finally interfacial adhesion and their mechanisms have been studied by molecular dynamics (MD) and first principle quantum mechanics (QM) simulation method.Accepted Author Manuscript(OLD) MSE-

    A systematic literature review on community relocation in the historic urban contexts

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    Community relocation could be voluntary or forced, but such change in the composition of inhabitants can endanger the historic urban context and its cultural significance. So, finding the answer to these questions is crucial: What are the main factors for relocation in historic urban contexts, and are these areas affected differently? This paper presented and discussed the results of a systematic literature review of international English-language publications. Databases such as Scopus, ICOMOS Open Archive, and UNESCO digital library were investigated to reveal the main factors for community relocation in the historic urban contexts. Results revealed a frequent focus in metropolitan regions and major cities worldwide between 1987 and 2021. The multiplicity of non-environmental relocation factors was also noticeable. Despite the commonalities of factors for community relocation worldwide, the type and effect of the relocation differed between the historic urban context and other urban contexts. The interaction of two main factors, namely economics and policies, was found to affect the process of community relocation in the historic urban context the most. Forced relocation was more predominant than voluntary relocation in historic urban contexts. However, the existing relations between internal and external factors that drive relocation must be further investigated. This research identified and charted how the local community relocation in historic urban contexts that are reflected in scholars’ publications. It also defined a theoretical framework on the factors of community relocation in these contexts and their interrelation, which is vital for both urban and heritage studies as well as planning practices.Heritage & Value

    GPU-accelerated Double-Stage Delay-Multiply-and-Sum Algorithm for Fast Photoacoustic Tomography Using LED Excitation and Linear Arrays

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    Double-stage delay-multiply-and-sum (DS-DMAS) is an algorithm proposed for photoacoustic image reconstruction. The DS-DMAS algorithm offers a higher contrast than conventional delay-and-sum and delay-multiply and-sum but at the expense of higher computational complexity. Here, we utilized a compute unified device architecture (CUDA) graphics processing unit (GPU) parallel computation approach to address the high complexity of the DS-DMAS for photoacoustic image reconstruction generated from a commercial light-emitting diode (LED)–based photoacoustic scanner. In comparison with a single-threaded central processing unit (CPU), the GPU approach increased speeds by nearly 140-fold for 1024 × 1024 pixel image; there was no decrease in accuracy. The proposed implementation makes it possible to reconstruct photoacoustic images with frame rates of 250, 125, and 83.3 when the images are 64 × 64, 128 × 128, and 256 × 256, respectively. Thus, DS-DMAS can be efficiently used in clinical devices when coupled with CUDA GPU parallel computation.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.ImPhys/Acoustical Wavefield Imagin
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