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R G Mani - One of the best experts on this subject based on the ideXlab platform.
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comparative study of Microwave Radiation induced magnetoresistive oscillations induced by circularly and linearly polarized photo excitation
arXiv: Mesoscale and Nanoscale Physics, 2016Co-Authors: Hanchun Liu, Werner Wegscheider, Zhuo Wang, R G ManiAbstract:A comparative study of the Radiation-induced magnetoresistance oscillations in the high mobility GaAs/AlGaAs heterostructure two dimensional electron system (2DES) under linearly- and circularlypolarized Microwave excitation indicates a profound difference in the response observed upon rotating the Microwave launcher for the two cases, although circularly polarized Microwave Radiation induced magnetoresistance oscillations observed at low magnetic fields are similar to the oscillations observed with linearly polarized Radiation. For the linearly polarized Radiation, the magnetoresistive response is a strong sinusoidal function of the launcher rotation (or linear polarization) angle, {\theta}. For circularly polarized Radiation, the oscillatory magnetoresistive response is hardly sensitive to {\theta}.
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comparative study of Microwave Radiation induced magnetoresistive oscillations induced by circularly and linearly polarized photo excitation
Scientific Reports, 2015Co-Authors: Hanchun Liu, Werner Wegscheider, Zhuo Wang, R G ManiAbstract:A comparative study of the Radiation-induced magnetoresistance oscillations in the high mobility GaAs/AlGaAs heterostructure two dimensional electron system (2DES) under linearly- and circularly- polarized Microwave excitation indicates a profound difference in the response observed upon rotating the Microwave launcher for the two cases, although circularly polarized Microwave Radiation induced magnetoresistance oscillations observed at low magnetic fields are similar to the oscillations observed with linearly polarized Radiation. For the linearly polarized Radiation, the magnetoresistive response is a strong sinusoidal function of the launcher rotation (or linear polarization) angle, θ. For circularly polarized Radiation, the oscillatory magnetoresistive response is hardly sensitive to θ.
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observation of linear polarization sensitivity in the Microwave Radiation induced magnetoresistance oscillations
Physical Review B, 2011Co-Authors: R G Mani, A N Ramanayaka, Werner WegscheiderAbstract:Laboratorium fu¨r Festko¨rperphysik, ETH Zu¨rich, 8093 Z¨urich, Switzerland(Dated: September 25, 2012)In the quasi two-dimensional GaAs/AlGaAs system, we investigate the effect of rotating in-situthe electric field of linearly polarized Microwaves relative to the current, on the Microwave-Radiation-induced magneto-resistance oscillations. We find that the frequency and the phase of the photo-excited magneto-resistance oscillations are insensitive to the polarization. On the other hand, theamplitudes of the magnetoresistance oscillations are remarkably responsive to the relative orientationbetween the Microwave antenna and the current-axis in the specimen. The results suggest a strikinglinear-polarization-sensitivity in the Radiation-induced magnetoresistance oscillations.INTRODUCTION
Werner Wegscheider - One of the best experts on this subject based on the ideXlab platform.
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comparative study of Microwave Radiation induced magnetoresistive oscillations induced by circularly and linearly polarized photo excitation
arXiv: Mesoscale and Nanoscale Physics, 2016Co-Authors: Hanchun Liu, Werner Wegscheider, Zhuo Wang, R G ManiAbstract:A comparative study of the Radiation-induced magnetoresistance oscillations in the high mobility GaAs/AlGaAs heterostructure two dimensional electron system (2DES) under linearly- and circularlypolarized Microwave excitation indicates a profound difference in the response observed upon rotating the Microwave launcher for the two cases, although circularly polarized Microwave Radiation induced magnetoresistance oscillations observed at low magnetic fields are similar to the oscillations observed with linearly polarized Radiation. For the linearly polarized Radiation, the magnetoresistive response is a strong sinusoidal function of the launcher rotation (or linear polarization) angle, {\theta}. For circularly polarized Radiation, the oscillatory magnetoresistive response is hardly sensitive to {\theta}.
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comparative study of Microwave Radiation induced magnetoresistive oscillations induced by circularly and linearly polarized photo excitation
Scientific Reports, 2015Co-Authors: Hanchun Liu, Werner Wegscheider, Zhuo Wang, R G ManiAbstract:A comparative study of the Radiation-induced magnetoresistance oscillations in the high mobility GaAs/AlGaAs heterostructure two dimensional electron system (2DES) under linearly- and circularly- polarized Microwave excitation indicates a profound difference in the response observed upon rotating the Microwave launcher for the two cases, although circularly polarized Microwave Radiation induced magnetoresistance oscillations observed at low magnetic fields are similar to the oscillations observed with linearly polarized Radiation. For the linearly polarized Radiation, the magnetoresistive response is a strong sinusoidal function of the launcher rotation (or linear polarization) angle, θ. For circularly polarized Radiation, the oscillatory magnetoresistive response is hardly sensitive to θ.
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observation of linear polarization sensitivity in the Microwave Radiation induced magnetoresistance oscillations
Physical Review B, 2011Co-Authors: R G Mani, A N Ramanayaka, Werner WegscheiderAbstract:Laboratorium fu¨r Festko¨rperphysik, ETH Zu¨rich, 8093 Z¨urich, Switzerland(Dated: September 25, 2012)In the quasi two-dimensional GaAs/AlGaAs system, we investigate the effect of rotating in-situthe electric field of linearly polarized Microwaves relative to the current, on the Microwave-Radiation-induced magneto-resistance oscillations. We find that the frequency and the phase of the photo-excited magneto-resistance oscillations are insensitive to the polarization. On the other hand, theamplitudes of the magnetoresistance oscillations are remarkably responsive to the relative orientationbetween the Microwave antenna and the current-axis in the specimen. The results suggest a strikinglinear-polarization-sensitivity in the Radiation-induced magnetoresistance oscillations.INTRODUCTION
Nick Serpone - One of the best experts on this subject based on the ideXlab platform.
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unusual effect of the magnetic field component of the Microwave Radiation on aqueous electrolyte solutions
Journal of Microwave Power and Electromagnetic Energy, 2012Co-Authors: Satoshi Horikoshi, Takuya Sumi, Nick SerponeAbstract:AbstractThe heating characteristics of aqueous electrolyte solutions (NaCl, KCl, CaCl2, NaBF4, and NaBr) of varying concentrations in ultrapure water by 2.45 GHz Microwave Radiation from a single-mode resonance Microwave device and a semiconductor Microwave generator were examined under conditions where the electric field (E-field) was dominant and where the magnetic field (H-field) dominated. Although magnetic field heating is not generally used in Microwave chemistry, the electrolyte solutions were heated almost entirely by the Microwaves’ H-field. The heating rates under H-field irRadiation at the higher concentrations of electrolytes (0.125 M to 0.50 M) exceeded the rates under E-field irRadiation. This inversion phenomenon in heating is described in terms of the penetration depth of the Microwaves. On the other hand, the action of the Microwave Radiation on ethylene glycol containing an electrolyte differed from that observed for water under E-field and H-field conditions.
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environmental remediation by an integrated Microwave uv illumination technique 8 fate of carboxylic acids aldehydes alkoxycarbonyl and phenolic substrates in a Microwave Radiation field in the presence of tio2 particles under uv irRadiation
Environmental Science & Technology, 2004Co-Authors: Satoshi Horikoshi, Fukuyo Hojo, Hisao Hidaka, Nick SerponeAbstract:Thermal and nonthermal effects originating when a system is subjected to a Microwave Radiation field in the TiO2-photocatalyzed transformation of model substances containing various functional groups (e.g., benzoic acid, phthalic acid, o-formylbenzoic acid, phthalaldehyde, succinic acid, dimethyl phthalate, diethyl phthalate, and phenol) have been examined under simultaneous irRadiation by ultraviolet (UV) and Microwave (MW) Radiations. Characteristics of the Microwave effects and the fate of each substrate during the Microwave-assisted photocatalytic process were monitored by UV absorption spectroscopy, HPLC methods, total organic carbon assays, and identification of intermediates using electrospray mass spectral techniques. Microwave thermal and nonthermal effects were delineated by comparing results from MW-generated internal heat versus conventional external heating, and at constant ambient temperature under a Microwave field. Factors involved in the nonthermal component of the Microwave Radiation wer...
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environmental remediation by an integrated Microwave uv illumination technique ix peculiar hydrolytic and co catalytic effects of platinum on the tio2 photocatalyzed degradation of the 4 chlorophenol toxin in a Microwave Radiation field
Journal of Photochemistry and Photobiology A-chemistry, 2004Co-Authors: Satoshi Horikoshi, Hisao Hidaka, Atsushi Tokunaga, Natsuko Watanabe, Nick SerponeAbstract:Abstract The photocatalyzed degradation of the 4-chlorophenol toxin (4-CP) in aqueous naked TiO 2 and platinized TiO 2 suspensions simultaneously subjected to UV light and Microwave Radiation was revisited to examine the fate of this toxin in the Microwave-assisted photocatalytic process by monitoring loss of total organic carbon (TOC; mineralization), formation of chloride ions (dechlorination of 4-CP), and identification of intermediates using HPLC and electrospray mass spectral (LC–MSD) techniques. Attempts are made to delineate Microwave thermal and nonthermal factors that impinge on the degradation by comparing experimental results from Microwave-generated heat versus results from a conventional (externally heated) thermally-assisted process, and from results in which the thermal factors were minimized by examining the degradative process at constant ambient temperature (25 °C). Possible Microwave Radiation effects on the Pt co-catalyst supported on TiO 2 were also probed through comparison of the degradation of 4-CP occurring on Pt/TiO 2 and on naked TiO 2 photocatalysts. Results suggest that, in a Microwave Radiation field, naked TiO 2 and Pt/TiO 2 particle surfaces interact with the Microwaves. The degradation pathway exhibited characteristics of hydrolysis of reactants and intermediates. Nonthermal Microwave effects play a role in the overall degradative process occurring in platinized TiO 2 dispersions. The possible nature of these unusual Microwave effects is briefly discussed.
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environmental remediation by an integrated Microwave uv illumination method v thermal and nonthermal effects of Microwave Radiation on the photocatalyst and on the photodegradation of rhodamine b under uv vis Radiation
Environmental Science & Technology, 2003Co-Authors: Satoshi Horikoshi, Hisao Hidaka, And Aiko Saitou, Nick SerponeAbstract:The photocatalyzed degradation (PD) of the cationic rhodamine-B (RhB) dye was examined in aqueous TiO2 dispersions using UV/Vis illumination assisted by Microwave Radiation (PD/MW). The initial degradation by the PD/MW method is compared to the PD method and to the thermally assisted PD method using conventional heating (PD/TH). Total organic carbon (TOC) assays show that the efficiency of complete mineralization of the dye follows PD/MW > PD/TH > PD > MW. In all cases, Microwave Radiation alone had no effect on the loss of TOC. The degradation involving Microwave Radiation was especially efficient when coupled to UV irRadiation. By contrast, the extent of degradation of RhB involving suitable excited states through visible irRadiation of the dye was rather inefficient when coupled to Microwave Radiation. Contact angle measurements on the TiO2 photocatalyst particles indicate that Microwave Radiation also causes an increase in the hydrophobic character of the TiO2 surface, with consequences on the adsorpt...
Peter E M Candido - One of the best experts on this subject based on the ideXlab platform.
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Microwave Radiation can alter protein conformation without bulk heating
FEBS Letters, 2003Co-Authors: David I De Pomerai, Brette Smith, Adam Dawe, Kate North, Tim Smith, David B Archer, Ian R Duce, D Jones, Peter E M CandidoAbstract:Exposure to Microwave Radiation enhances the aggregation of bovine serum albumin in vitro in a time- and temperature-dependent manner. Microwave Radiation also promotes amyloid fibril formation by bovine insulin at 60°C. These alterations in protein conformation are not accompanied by measurable temperature changes, consistent with estimates from field modelling of the specific absorbed Radiation (15–20 mW kg−1). Limited denaturation of cellular proteins could explain our previous observation that modest heat-shock responses are induced by Microwave exposure in Caenorhabditis elegans. We also show that heat-shock responses both to heat and Microwaves are suppressed after RNA interference ablating heat-shock factor function.
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Microwave Radiation can alter protein conformation without bulk heating
FEBS Letters, 2003Co-Authors: David I De Pomerai, Brette Smith, Adam Dawe, Kate North, David B Archer, Ian R Duce, D Jones, Timothy P L Smith, Peter E M CandidoAbstract:Exposure to Microwave Radiation enhances the aggregation of bovine serum albumin in vitro in a time- and temperature-dependent manner. Microwave Radiation also promotes amyloid fibril formation by bovine insulin at 60 degrees C. These alterations in protein conformation are not accompanied by measurable temperature changes, consistent with estimates from field modelling of the specific absorbed Radiation (15-20 mW kg(-1)). Limited denaturation of cellular proteins could explain our previous observation that modest heat-shock responses are induced by Microwave exposure in Caenorhabditis elegans. We also show that heat-shock responses both to heat and Microwaves are suppressed after RNA interference ablating heat-shock factor function.
Imran Ali - One of the best experts on this subject based on the ideXlab platform.
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novel and economic method of carbon nanotubes synthesis on a nickel magnesium oxide catalyst using Microwave Radiation
Journal of Molecular Liquids, 2018Co-Authors: Elena Burakova, T P Dyachkova, A V Rukhov, E N Tugolukov, Evgeny Galunin, A G Tkachev, Al Arsh Basheer, Imran AliAbstract:Abstract Carbon nanotubes (CNTs) are gaining increased importance in many fields of science and technology due to their unique properties of greater surface area, mechanical strength, electrical and thermal conductivity. A novel method of carbon nanotubes synthesis on a nickel magnesium oxide catalyst using Microwave Radiation was developed and presented. In the present paper, the possibility of modifying a Ni-MgO catalyst, for carbon nanotube synthesis with Microwave Radiation (0.8 kW and 2.45 GHz) at the production stage, is studied. The effect of this Radiation on the catalyst characteristics (specific surface area, catalytic activity, etc.) is experimentally considered. It is shown that the use of short term exposure to the Microwave Radiation in preparing the catalyst made it possible to increase its specific surface area from 5.2 to 9.1 m2/g. The implementation of chemical vapor deposition of the catalyst, modified with the Microwave Radiation for 30 s, contributed to an increase in the yield of a nanostructured material by 40–45%; making carbon nanotubes inexpensive in production. The synthesized carbon nanostructured material predominantly represented multilayered nanotubes with a diameter of 10–40 nm. The developed method was capable to produce 40–45% yield with almost two time's greater surface area. The synthesized carbon nanotubes may be used for various purposes including water treatment due to the economy in production and large surface area.
