Anscombe, G. E. M.

Vogler, Candace

doi:10.1002/9781444367072.wbiee591

Cited by 5 publications

(8 citation statements)

References 9 publications

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“…The film without the NFC and TTO exhibited an angle of 61.9° (B1), while control films with NFC presented contact angles of 54.2° (C1) and 84.5° (C2). A surface of a material is considered hydrophobic when the contact angle is greater than 65°, therefore all the evaluated films with TTO can be considered hydrophobic . The amylases groups from cassava starch have chemical affinity with water, which attracts the water drop to the film and decreases the measured contact angle, as in B1 .…”

Section: Resultsmentioning

confidence: 99%

Development of active cassava starch cellulose nanofiber‐based films incorporated with natural antimicrobial tea tree essential oil

Silveira

Silva

Pimentel

et al. 2019

J of Applied Polymer Sci

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In the present study, a cassava starch‐glycerol film with reinforcement of Pinus sp. nanofibers (NFC) incorporated with tea tree (Melaleuca alternifolia) essential oil (TTO) were prepared by casting technique. The physical (barrier, mechanical, and optical), structural, and antimicrobial properties of the films were evaluated and compared with the control films. Films with 0.08% TTO exhibited a significant increase in the tensile strength (TS) while films with 1.5% TTO showed a decrease in TS, suggesting a crosslinking effect. The addition of 1.5% TTO reduced the water vapor permeability values in 43% comparing to the control films. Analysis obtained by Fourier transform infrared spectroscopy showed bands related to the interaction between TTO and matrix for films with 1.5% TTO and 0.3% NFC. This film was effective against Staphylococcus aureus and Candida albicans which could be applied for several packaging purposes. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48726.

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Section: Resultsmentioning

confidence: 99%

Development of active cassava starch cellulose nanofiber‐based films incorporated with natural antimicrobial tea tree essential oil

Silveira

Silva

Pimentel

et al. 2019

J of Applied Polymer Sci

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“…We use in our model a combination of LTE radiative transfer and tabulated optically thin radiative loss. The radiative transfer module, originally developed by Vögler et al (2005) was modified to dynamically switch off once the transition region is reached. We compute the position of the transition region on a column-by-column basis by finding the first grid cell with T > 20, 000 K going upward from the photosphere.…”

Section: Radiative Lossmentioning

confidence: 99%

“…In this paper we present a new version of the MURaM radiative MHD code (Vögler et al 2005;Rempel 2014), in which we implement a treatment of the corona along the lines of the above mentioned "realistic" simulations. Unlike Gudiksen et al (2011) we do not implement at this time a realistic treatment of the chromosphere, i.e.…”

Section: Introductionmentioning

confidence: 99%

Extension of the Muram Radiative MHD Code for Coronal Simulations

Rempel

2016

ApJ

195

266

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We present a new version of the MURaM radiative MHD code that allows for simulations spanning from the upper convection zone into the solar corona. We implemented the relevant coronal physics in terms of optically thin radiative loss, field aligned heat conduction and an equilibrium ionization equation of state. We artificially limit the coronal Alfvén and heat conduction speeds to computationally manageable values using an approximation to semi-relativistic MHD with an artificially reduced speed of light (Boris correction). We present example solutions ranging from quiet to active Sun in order to verify the validity of our approach. We quantify the role of numerical diffusivity for the effective coronal heating. We find that the (numerical) magnetic Prandtl number determines the ratio of resistive to viscous heating and that owing to the very large magnetic Prandtl number of the solar corona, heating is expected to happen predominantly through viscous dissipation. We find that reasonable solutions can be obtained with values of the reduced speed of light just marginally larger than the maximum sound speed. Overall this leads to a fully explicit code that can compute the time evolution of the solar corona in response to photospheric driving using numerical time steps not much smaller than 0.1 seconds. Numerical simulations of the coronal response to flux emergence covering a time span of a few days are well within reach using this approach.

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“…The failure criteria parameters z i i ¼ 1; 6 ð Þ that define the onset of failure are reported, Table 5. Based on [32,39], the viscosity parameter h and the critical energy release rate G Ic used are 28 000 and 5.5 N mm À 1 , respectively.…”

Section: Preprocessingmentioning

confidence: 99%

A FEM‐based virtual test‐rig for hybrid metal‐composites clinching joints

Dean

Rolfes

Grbic

et al. 2019

Materialwissenschaft Werkst

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A 3D FEM-based virtual test-rig tool for the hybrid metal-composites clinching technology is developed and built in the commercial finite element software Abaqus. The proposed tool consists of two modules: a module to simulate the hybrid clinching process and another to predict the strength of the clinched joints. At first, experimental results concerning the hybrid metal-composites (EN AW-5754-PA6GF30) clinching are presented. Then, the developed virtual tool is described in detail outlining the constitutive models implemented for the hybrid pairing sheets as well as illustrating the proposed FE numerical procedures. Later, the developed tool is applied to the hybrid pairing EN AW-5754-PA6GF30. In comparison to the conducted experiments, the simulation results obtained show the applicability and accuracy of the developed virtual testing tool. Keywords: Metal / composites / multi-material design / hybrid clinching / virtual testing / finite element method (FEM) Ein dreidimensionales FEM-basiertes Simulationsmodell zur virtuellen Prüfung von hybriden Clinchverbindungen aus Faser-Kunststoff/Metall-Verbunden wurde entwickelt und in der kommerziellen Finite-Elemente-Software Abaqus aufgebaut. Das Simulationsmodell besteht aus zwei Berechnungsmodulen: Einem zur Simulation des hybriden Clinchprozesses, und einem weiteren zur numerischen Vorhersage der Festigkeit der hybriden Clinchverbindung. Zunächst werden experimentelle Ergebnisse zum hybriden Clinchen der Faser-Kunststoff/Metall-Verbunde (EN AW-5754 / PA6GF30) vorgestellt. Anschließend wird das entwickelte Berechnungsmodell detailliert beschrieben, wobei hier insbesondere auf die konstitutiven Materialmodelle, die für die einzelnen Fügeparameter in Abaqus implementiert worden sind, sowie auf das Simulationsverfahren eingegangen wird. Nach Berechnung des hybriden Clinchprozesses und erfolgreicher Modellvalidierung wird das Berechnungsmodul zur virtuellen Prüfung der Verbindungsfestigkeit angewandt. Durch den Vergleich der Simulationsergebnisse mit den experimentellen Daten wird die Anwendbarkeit und Genauigkeit des hier entwickelten virtuellen Prüfstands aufgezeigt.

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Anscombe, G. E. M.

Abstract: G. E. M. Anscombe (1919–2001) was a formidable thinker. Her brilliant translation of some of Ludwig Wittgenstein's mature work (Wittgenstein 1953) brought him to widespread attention in the English‐speaking world.

Cited by 5 publications

References 9 publications

Development of active cassava starch cellulose nanofiber‐based films incorporated with natural antimicrobial tea tree essential oil

Development of active cassava starch cellulose nanofiber‐based films incorporated with natural antimicrobial tea tree essential oil

Extension of the Muram Radiative MHD Code for Coronal Simulations

A FEM‐based virtual test‐rig for hybrid metal‐composites clinching joints

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