Static Magnetic Field

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Yves Fautrelle - One of the best experts on this subject based on the ideXlab platform.

  • fabrication of aluminum alloy functionally graded material using directional solidification under an axial Static Magnetic Field
    Scientific Reports, 2018
    Co-Authors: Annie Gagnoud, Yves Fautrelle, Rene Moreau
    Abstract:

    Aluminum alloy in situ functionally graded materials (FGMs) have been successfully fabricated using directional solidification under an axial Static Magnetic Field. Al-Zn, Al-Ni and Al-Cu alloys with a hypereutectic composition were selected to produce FGMs. Experimental results show that the graded composition of the primary phases (i.e., Zn, Al3Ni and Al2Cu) is obvious along the longitudinal section of the sample. The graded composition of the primary phases could be controlled by the value of the Magnetic Field, growth rate and temperature gradient. A proposed model and simulations are carried out to explain the origin of the graded composition of the primary phases in FGMs during directional solidification under an axial Static Magnetic Field. It should be attributed to the combined actions of heavier species migration under gravity force and thermoelectric (TE) Magnetic convection under Magnetic Field. Furthermore, it can be found that the Magnetic Field can induce the columnar FGMs to change into equiaxed FGMs. This work not only presents a new approach to fabricate FGMs using the directional solidification under an axial Static Magnetic Field but also deeply understands the effect of the solute migration and temperature distribution on the crystal growth during directional solidification.

  • Thermoelectric Magnetohydrodynamic Flows and Their Induced Change of Solid–Liquid Interface Shape in Static Magnetic Field-Assisted Directional Solidification
    Metallurgical and Materials Transactions A, 2016
    Co-Authors: Jiang Wang, Yves Fautrelle, Henri Nguyen-thi, Guillaume Reinhart, Yunbo Zhong, Zhongming Ren
    Abstract:

    Applying Static Magnetic Field can produce flows (thermoelectric magnetohydrodynamic flows, TEMHDF) in the melt by interacting with the thermoelectric currents (TEC) during solidification of metals. A physical model was proposed to interpret how these TEC appear at the solid-liquid interface and verified by a corresponding simulation. The influences of TEMHDF on solidification were investigated through both ex-situ experiments and n situ observations by means of synchrotron X-ray radiography. The 3D numerical simulations of TEMHDF were performed for these two cases, respectively, and suggested that both the change of interface shape with different transverse Static Magnetic Fields demonstrated by the ex-situ experiments and the real time observed interface shape varying under a 0.08 T transverse Static Magnetic Field could attribute to the TEMHDF advanced solid-liquid interface in the Static Magnetic Field-assisted directional solidification. The TEMHDF produced by an axial Static Magnetic Field were also computed along with the interface change predicted based on which is good in line with the published experimental results. This study of TEMHDF and their impacts on the solid-liquid interface shape provides a method to tailor the structure during directional solidification using Static Magnetic Field.

  • thermoelectric magnetohydrodynamic flows and their induced change of solid liquid interface shape in Static Magnetic Field assisted directional solidification
    Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science, 2016
    Co-Authors: Jiang Wang, Yves Fautrelle, Guillaume Reinhart, Yunbo Zhong, Henri Nguyenthi, Hanlin Liao, Zhongming Ren
    Abstract:

    Applying Static Magnetic Field can produce flows (thermoelectric magnetohydrodynamic flows, TEMHDF) in the melt by interacting with the thermoelectric currents (TEC) during solidification of metals. A physical model was proposed to interpret how these TEC appear at the solid–liquid interface and verified by a corresponding simulation. The influences of TEMHDF on solidification were investigated through both ex-situ experiments and n situ observations by means of synchrotron X-ray radiography. The 3D numerical simulations of TEMHDF were performed for these two cases, respectively, and suggested that both the change of interface shape with different transverse Static Magnetic Fields demonstrated by the ex-situ experiments and the real time observed interface shape varying under a 0.08 T transverse Static Magnetic Field could attribute to the TEMHDF advanced solid–liquid interface in the Static Magnetic Field-assisted directional solidification. The TEMHDF produced by an axial Static Magnetic Field were also computed along with the interface change predicted based on which is good in line with the published experimental results. This study of TEMHDF and their impacts on the solid–liquid interface shape provides a method to tailor the structure during directional solidification using Static Magnetic Field.

Ahmed Landoulsi - One of the best experts on this subject based on the ideXlab platform.

  • Static Magnetic Field increases the sensitivity of Salmonella to gentamicin
    Annals of Microbiology, 2010
    Co-Authors: Jihen Tagourti, Alya El May, Amine Aloui, Abdelwaheb Chatti, Ridha Ben Aissa, Ahmed Landoulsi
    Abstract:

    The present study was carried out to evaluate the effects of Static Magnetic Field (SMF) on antibiotic sensitivity of Salmonella enterica subsp. enterica serovar Hadar. We have evaluated antibiotic susceptibility using the disc diffusion method following exposure to SMF. Our results showed that exposure to a 200-mT SMF Static Magnetic Field increased the efficiency (p

  • Static Magnetic Field increases the sensitivity of Salmonella to gentamicin
    Annals of Microbiology, 2010
    Co-Authors: Jihen Tagourti, Amine Aloui, Abdelwaheb Chatti, Alya El May, Ridha Ben Aissa, Ahmed Landoulsi
    Abstract:

    The present study was carried out to evaluate the effects of Static Magnetic Field (SMF) on antibiotic sensitivity of Salmonella enterica subsp. enterica serovar Hadar. We have evaluated antibiotic susceptibility using the disc diffusion method following exposure to SMF. Our results showed that exposure to a 200-mT SMF Static Magnetic Field increased the efficiency (p < 0.01) of gentamicin against Salmonella Hadar but did not affect the diameter of the inhibition zone of some other antibiotics actives on Enterobacteria: penicillin, oxacillin, cephalotin, neomycin, amikacin, tetracyclin, erythromycin, spiramycin, chloramphenicol, nalidixic acid and vancomycin.

  • Effects of Static Magnetic Field on Cell Growth, Viability, and Differential Gene Expression in Salmonella
    Foodborne Pathogens and Disease, 2009
    Co-Authors: Alya El May, Ridha Ben Aissa, Hafedh Abdelmelek, Sarra Snoussi, Najla Ben Miloud, Imed Maatouk, Ahmed Landoulsi
    Abstract:

    In the present study, we investigated the effect of exposure to A Static Magnetic Field (SMF) on cell growth, viability, and gene expression of Salmonella enterica subsp. enterica serovar Hadar. Our results indicated that SMF exposure (200 mT, 13 hours) failed to alter cellular growth but induced a decrease of colony-forming units (CFU) between 3 and 6 hours followed by an increase from 6 to 9 hours. The analysis of the differential expression of rpoA, dnaK, katN, and 16S rRNA genes under SMF exposure (200 mT, 10 hours) showed that the expression level of the 16S rRNA mRNA remained stable during the exposure and can thus be used as a reference gene for the analysis on the differential gene expression of Salmonella Hadar. Interestingly, mRNAs of rpoA, katN, and dnaK genes were over-expressed following 10 hours of SMF exposure (200 mT). These data suggest a possible stress response of Salmonella Hadar to Static Magnetic Field.

Zhongming Ren - One of the best experts on this subject based on the ideXlab platform.

  • Thermoelectric Magnetohydrodynamic Flows and Their Induced Change of Solid–Liquid Interface Shape in Static Magnetic Field-Assisted Directional Solidification
    Metallurgical and Materials Transactions A, 2016
    Co-Authors: Jiang Wang, Yves Fautrelle, Henri Nguyen-thi, Guillaume Reinhart, Yunbo Zhong, Zhongming Ren
    Abstract:

    Applying Static Magnetic Field can produce flows (thermoelectric magnetohydrodynamic flows, TEMHDF) in the melt by interacting with the thermoelectric currents (TEC) during solidification of metals. A physical model was proposed to interpret how these TEC appear at the solid-liquid interface and verified by a corresponding simulation. The influences of TEMHDF on solidification were investigated through both ex-situ experiments and n situ observations by means of synchrotron X-ray radiography. The 3D numerical simulations of TEMHDF were performed for these two cases, respectively, and suggested that both the change of interface shape with different transverse Static Magnetic Fields demonstrated by the ex-situ experiments and the real time observed interface shape varying under a 0.08 T transverse Static Magnetic Field could attribute to the TEMHDF advanced solid-liquid interface in the Static Magnetic Field-assisted directional solidification. The TEMHDF produced by an axial Static Magnetic Field were also computed along with the interface change predicted based on which is good in line with the published experimental results. This study of TEMHDF and their impacts on the solid-liquid interface shape provides a method to tailor the structure during directional solidification using Static Magnetic Field.

  • thermoelectric magnetohydrodynamic flows and their induced change of solid liquid interface shape in Static Magnetic Field assisted directional solidification
    Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science, 2016
    Co-Authors: Jiang Wang, Yves Fautrelle, Guillaume Reinhart, Yunbo Zhong, Henri Nguyenthi, Hanlin Liao, Zhongming Ren
    Abstract:

    Applying Static Magnetic Field can produce flows (thermoelectric magnetohydrodynamic flows, TEMHDF) in the melt by interacting with the thermoelectric currents (TEC) during solidification of metals. A physical model was proposed to interpret how these TEC appear at the solid–liquid interface and verified by a corresponding simulation. The influences of TEMHDF on solidification were investigated through both ex-situ experiments and n situ observations by means of synchrotron X-ray radiography. The 3D numerical simulations of TEMHDF were performed for these two cases, respectively, and suggested that both the change of interface shape with different transverse Static Magnetic Fields demonstrated by the ex-situ experiments and the real time observed interface shape varying under a 0.08 T transverse Static Magnetic Field could attribute to the TEMHDF advanced solid–liquid interface in the Static Magnetic Field-assisted directional solidification. The TEMHDF produced by an axial Static Magnetic Field were also computed along with the interface change predicted based on which is good in line with the published experimental results. This study of TEMHDF and their impacts on the solid–liquid interface shape provides a method to tailor the structure during directional solidification using Static Magnetic Field.

  • Suppressed interdiffusion behavior of Fe/Fe-Si alloy under Static Magnetic Field
    2015
    Co-Authors: Lijun Fan, Yunbo Zhong, Zhe Shen, Tianxiang Zheng, Zhongming Ren
    Abstract:

    Effect of Static Magnetic Field on interdiffusion behavior and intermediate phase growth characteristics in Fe-Fe50wt.%Si diffusion couples has been investigated. It was found that both FeSi and solid solution layers formed after annealing at different temperatures with and without Magnetic Field. Growth of FeSi and solid solution layers obeys parabolic law and is suppressed under Magnetic Field due to the reduced frequency factor D0 but not the activation energy Q.

Christophe Caloz - One of the best experts on this subject based on the ideXlab platform.

  • Artificial Faraday rotation using a ring metamaterial structure without Static Magnetic Field
    Applied Physics Letters, 2011
    Co-Authors: Toshiro Kodera, Dunitrios L. Sounas, Christophe Caloz
    Abstract:

    A metamaterial structure composed of a periodic array of conductive rings including each a semiconductor-based isolator is experimentally shown to produce Faraday rotation. Due to the presence of the isolators, a unidirectional traveling-wave regime is established along the rings, generating rotating Magnetic moments and hence emulating the phenomenon of electron spin precession. The metamaterial exhibits the same response as a Magnetically biased ferrite or plasma, but without the need of any Static Magnetic Field bias, and therefore, it is easily integrated in printed circuit technology.

Jiang Wang - One of the best experts on this subject based on the ideXlab platform.

  • Thermoelectric Magnetohydrodynamic Flows and Their Induced Change of Solid–Liquid Interface Shape in Static Magnetic Field-Assisted Directional Solidification
    Metallurgical and Materials Transactions A, 2016
    Co-Authors: Jiang Wang, Yves Fautrelle, Henri Nguyen-thi, Guillaume Reinhart, Yunbo Zhong, Zhongming Ren
    Abstract:

    Applying Static Magnetic Field can produce flows (thermoelectric magnetohydrodynamic flows, TEMHDF) in the melt by interacting with the thermoelectric currents (TEC) during solidification of metals. A physical model was proposed to interpret how these TEC appear at the solid-liquid interface and verified by a corresponding simulation. The influences of TEMHDF on solidification were investigated through both ex-situ experiments and n situ observations by means of synchrotron X-ray radiography. The 3D numerical simulations of TEMHDF were performed for these two cases, respectively, and suggested that both the change of interface shape with different transverse Static Magnetic Fields demonstrated by the ex-situ experiments and the real time observed interface shape varying under a 0.08 T transverse Static Magnetic Field could attribute to the TEMHDF advanced solid-liquid interface in the Static Magnetic Field-assisted directional solidification. The TEMHDF produced by an axial Static Magnetic Field were also computed along with the interface change predicted based on which is good in line with the published experimental results. This study of TEMHDF and their impacts on the solid-liquid interface shape provides a method to tailor the structure during directional solidification using Static Magnetic Field.

  • thermoelectric magnetohydrodynamic flows and their induced change of solid liquid interface shape in Static Magnetic Field assisted directional solidification
    Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science, 2016
    Co-Authors: Jiang Wang, Yves Fautrelle, Guillaume Reinhart, Yunbo Zhong, Henri Nguyenthi, Hanlin Liao, Zhongming Ren
    Abstract:

    Applying Static Magnetic Field can produce flows (thermoelectric magnetohydrodynamic flows, TEMHDF) in the melt by interacting with the thermoelectric currents (TEC) during solidification of metals. A physical model was proposed to interpret how these TEC appear at the solid–liquid interface and verified by a corresponding simulation. The influences of TEMHDF on solidification were investigated through both ex-situ experiments and n situ observations by means of synchrotron X-ray radiography. The 3D numerical simulations of TEMHDF were performed for these two cases, respectively, and suggested that both the change of interface shape with different transverse Static Magnetic Fields demonstrated by the ex-situ experiments and the real time observed interface shape varying under a 0.08 T transverse Static Magnetic Field could attribute to the TEMHDF advanced solid–liquid interface in the Static Magnetic Field-assisted directional solidification. The TEMHDF produced by an axial Static Magnetic Field were also computed along with the interface change predicted based on which is good in line with the published experimental results. This study of TEMHDF and their impacts on the solid–liquid interface shape provides a method to tailor the structure during directional solidification using Static Magnetic Field.