The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform
Baorong Ni - One of the best experts on this subject based on the ideXlab platform.
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Longitudinal Magnetic Field Effect in critical current characteristics of Bi-2223 superconducting tape
Journal of Physics: Conference Series, 2020Co-Authors: Xuan Wu, Baorong NiAbstract:In this study, we focused on the longitudinal Magnetic Field Effect in critical current densities and investigated the enhancement of the electrical conduction properties in a commercial Bi-2223 superconducting tape. Since the samples used in this study were polycrystalline and tape-shaped, the longitudinal Magnetic Field Effect was expected to differ from that in single crystals or conventional superconducting alloys. Therefore, the critical current characteristics at Magnetic Fields of up to 5 T as well as at various angles between the Magnetic Field and current were measured in detail.
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Longitudinal Magnetic Field Effect in Critical Current Characteristics of Bi-2223 Superconducting Tape
2018 International Conference on Engineering Applied Sciences and Technology (ICEAST), 2018Co-Authors: Xuan Wu, Baorong NiAbstract:In this study, we concentrated on the longitudinal Magnetic Field Effect in critical current densities and investigated the enhancement of the electrical conduction properties in a commercial Bi-2223 superconducting tape. Since the samples used in this study were polycrystalline and tape-shaped, the variation of the critical current density caused by the longitudinal Magnetic Field Effect and anisotropy of the upper critical Magnetic Field was expected to be clarified. Therefore, the critical current characteristics at a Magnetic Field of up to 5 T as well as at various angles between the Magnetic Field and current were measured in detail. Through investigation, more detailed electrical characteristics of Bi-2223 were clarified which can provide superconducting cable developer with more useful information. The results demonstrate the longitudinal Magnetic Field Effect is obvious at the high Magnetic Field rather than that at the low Magnetic Field and the upper critical Magnetic Field is decreasing gradually with the increase of the temperature. It also can be known that the difference between the value of upper critical Magnetic Field and that of applied Magnetic Field will exert an influence on the critical current density of Bi-2223 superconducting tape.
Samita Basu - One of the best experts on this subject based on the ideXlab platform.
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Magnetic Field Effect on indole exciplexes: an anomalous dielectric dependence
Journal of Luminescence, 2020Co-Authors: Tamal Sengupta, Samita BasuAbstract:Individual exciplex formation between various aromatic hydrocarbons, anthracene, pyrene, all-s-trans-1,4-diphenylbuta-1,3-diene and a heteroaromatic amine, 1,2-dimethylindole, was investigated by steady-state fluorescence and Magnetic Field Effect (MFE). A comparative study was carried out with two other exciplex systems 9-cyanophenanthrene-1,2-dimethylindole and 9-cyanophenanthrene-N-methylindole. The extent of charge transfer and dielectric dependence of MFE reveals the potential role of specific interactions related to exciplex geometry.
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Influence of steric factors on exciplex energy and Magnetic Field Effect
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2020Co-Authors: Suchandra Chatterjee, Samita Basu, Sharmistha Dutta Choudhury, Nandita Ghosh, Manas ChakrabartyAbstract:Abstract With the advent of spin chemistry, Magnetic Field Effect (MFE) on exciplex luminescence has emerged as an important domain of research. MFE is a diffusion controlled phenomenon and hence is solvent dielectric ( e ) dependent. It maximizes at a particular e ( e max ) for a specific exciplex system. Various attempts have been made to explain the variation of this e max from one exciplex to another. In our present work we have succeeded for the first time to enmark the energy of exciplex ( E ex ) as the prime factor in determining the e max . We have indicated a definite inverse correlation (1:1) between e max and E ex . We have also tried to correlate some parameters that are important in exciplex formation, e.g. Charton's steric constant ( ν c ), repulsive energy ( R e ) and E ex .
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Magnetic Field Effect on indole exciplexes: a comparative study.
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2004Co-Authors: Tamal Sengupta, Samita BasuAbstract:Abstract A comparative Magnetic Field Effect (MFE) study was done on indole exciplexes with various acceptors, anthracene, pyrene, all-s-trans-1,4-diphenylbuta-1,3-diene and 9-cyanophenanthrene. A surprisingly low Magnetic Field Effect was detected for the 9-cyanophenanthrene exciplexes and was correlated with exciplex geometry. The wavelength dependence of Magnetic Field Effect confirms the presence of single charge-transfer complex for all the exciplexes with 1,2-dimethylindole.
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Magnetic Field Effect on exciplex luminescence in liquids
Journal of Molecular Liquids, 1993Co-Authors: Mihir Chowdhury, Samita Basu, Rina Dutta, Debnarayan NathAbstract:Abstract The Effect of a Magnetic Field on the luminescence of unlinked as well as linked exciplex systems has been discussed. The Magnetic Field modulated luminescence. (Δφ/φ) is not only dictated by the hyperfine interaction in the radical ion pair, but also by the environment, such as viscosity and dielectric constant (ϵ) of the medium and presence of other molecules in the neighbourhood of the exciplex. A complex interplay between spin evolution, radical pair recombination and diffusion determine the magnitude and nature of the Magnetic Field Effect (MFE). The dependence of (Δφ/φ) on the ϵ could be explained on the basis of simple theoretical models. The concept of Heisenberg spin exchange has been invoked to rationalise the quenching of MFE by lanthanide ions. Time-resolved studies provide useful information regarding the dynamics of the spin-evolution of the system. In viscous medium the rotational diffusion slows down and the MFE becomes dependent on the direction of the Field with respect to the exciplex.
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Magnetic Field Effect on the exciplex luminescence as a probe for estimating the hyperfine interaction in a radical ion pair system
1991Co-Authors: Samita BasuAbstract:Magnetic Field Effect on 9-cyanophenanthrene —trans anethole exciplex gives theB 1/2 value, a measure of ‘average’ hyperfine interaction present in the system. This has been compared with the theoretically computed values of hyperfine coupling constants present in the component radical ions using the INDO-UHF method.
Hiroshi Morita - One of the best experts on this subject based on the ideXlab platform.
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Effect of 2 propenyltrimethylsilane and Magnetic Field Effect on photochemical fe co fine particle formation from a ternary gaseous mixture
Journal of Photochemistry and Photobiology A-chemistry, 2011Co-Authors: Hiroshi Morita, Koh Hattori, Jan SubrtAbstract:Abstract From a gaseous mixture of iron pentacarbonyl (Fe(CO) 5 ), cobalt tricarbonyl nitrosyl (Co(CO) 3 NO), and 2-propenyltrimethylsilane (allyltrimethylsilane) (ATMeSi), spherical aerosol particles with a mean diameter of 0.36 μm were produced under UV light irradiation. Addition of ATMeSi accelerated the chemical reactions of Co(CO) 3 NO to produce aerosol particles efficiently, and decelerated those of Fe(CO) 5 to inhibit the formation of crystalline deposits which were mainly composed of Fe 2 (CO) 9 structure involving Fe–C( O)–Co bond. Chemical structure and chemical compositions of the sedimentary aerosol particles were investigated from FT-IR and SEM–EDS analyses. Co species were rich in the sedimentary particles, and efficient excitation of Co(CO) 3 NO molecules at 355 nm with a Nd:YAG laser resulted in a greater abundance of Co species. Under a Magnetic Field of up to 5 T, sedimentary aerosol particles were synthesized from the ternary gaseous mixture. Chemical composition of the particles was dependent on Magnetic Field strength, and atomic ratios of Fe and Si to Co atom increased above 3 T. Magnetic Field Effect on the nucleation reactions was discussed briefly.
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Photochemical sensitization and Magnetic Field Effect on ultrafine particle formation from a gaseous mixture of glyoxal and carbon disulphide
Molecular Physics, 2003Co-Authors: Hiroshi Morita, Fuyuki Matsubayashi, Akiko NozueAbstract:Under light irradiation at 435.8 nm with a medium-pressure mercury lamp, a gaseous mixture of glyoxal (GLY) and carbon disulphide (CS2) produced sedimentary aerosol particles at the initial stage of light irradiation. The nucleation process of the aerosol particles was investigated by measuring He-Ne laser light intensity scattered by the aerosol particles as formed under light irradiation at 435.8 nm. From the dependence of the scattered light intensity on the partial pressure of GLY, it was found that electronically excited GLY in the n-π∗ state initiated chemical reactions with CS2 leading to nucleation of the aerosol particles. An external Magnetic Field Effect on the nucleation process was measured for a gaseous mixture of GLY and CS2. With the application of a Magnetic Field of 5.1 kG, the nucleation reaction was accelerated and the convection of the gaseous mixture was changed. The Magnetic Field Effect on the gaseous mixture is briefly discussed in comparison with the results obtained from a gaseo...
Mihir Chowdhury - One of the best experts on this subject based on the ideXlab platform.
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Magnetic Field Effect on the micellar (C60)n−–pyrene+ radical-pair system
Journal of Photochemistry and Photobiology A-chemistry, 1999Co-Authors: Mintu Haldar, Ajay Misra, Asok K. Banerjee, Mihir ChowdhuryAbstract:We report for the first time a Magnetic Field Effect on radical pair recombination involving fullerene clusters in a fluorinated micelle. It is found that the rate of decay of radicals increases with increasing external Magnetic Field strength. The Effect at high Field is attributed to the g-anisotropy-induced relaxation mechanism.
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Solvent dependence of Magnetic-Field Effect in a polymer-linked exciplex system
Polymer, 1995Co-Authors: Rina Dutta, Mihir Chowdhury, Mitchell A. WinnikAbstract:Abstract The response of pyrene-polystyrene-dimethylaniline (Py-PS-DMA) polymer (Mn = 4770) to an externally applied Magnetic Field has been examined in different solvents. Although the dielectric-constant (ϵ) Effect is similar to that for the unlinked system, a closer look shows an interesting dependence on the nature of the solvent mixture. In pure acetone Δφ/φ is higher than that in a mixed solvent (tetrahydrofuran/dimethylformamide) of the same ϵ. The results have been explained on the basis of the fact that the influences of coil extension on the Magnetic-Field Effect and the dielectric-constant Effect compete with each other, resulting in different behaviours depending on the nature of the solvent mixture.
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Magnetic Field Effect and multiplicity of conformation in a polymer-linked exciplex system
Journal of Photochemistry and Photobiology A-chemistry, 1994Co-Authors: Rina Dutta, Mihir Chowdhury, Debnarayan Nath, Mitchell A. WinnickAbstract:Abstract The Magnetic Field sensitivity of the pyrene-dimethylaniline (Py-DMA) system, linked by a polystrene (PS) spacer, was examined. It was found that isodielectric mixtures of tetrahydrofuran (THF) and dimethylformamide (DMF) and benzene and dimethylsulphoxide (DMSO) behave differently, the latter quenching the Magnetic Field Effect more than the former; this is opposite to that found for the unlinked Py-DMA system. These studies demonstrate the importance of the solvent-dependent polymer backbone conformation. It was found that, in both of the above solvent mixture, the normal luminescence (φ) and the Magnetic-Field-modulated luminescence (Δφ) exhibit a shift in wavelength, indicating conformers with different Magnetic sensitivities. The spectra taken at different times after excitation also support this conclusion.
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Magnetic Field Effect on exciplex luminescence in liquids
Journal of Molecular Liquids, 1993Co-Authors: Mihir Chowdhury, Samita Basu, Rina Dutta, Debnarayan NathAbstract:Abstract The Effect of a Magnetic Field on the luminescence of unlinked as well as linked exciplex systems has been discussed. The Magnetic Field modulated luminescence. (Δφ/φ) is not only dictated by the hyperfine interaction in the radical ion pair, but also by the environment, such as viscosity and dielectric constant (ϵ) of the medium and presence of other molecules in the neighbourhood of the exciplex. A complex interplay between spin evolution, radical pair recombination and diffusion determine the magnitude and nature of the Magnetic Field Effect (MFE). The dependence of (Δφ/φ) on the ϵ could be explained on the basis of simple theoretical models. The concept of Heisenberg spin exchange has been invoked to rationalise the quenching of MFE by lanthanide ions. Time-resolved studies provide useful information regarding the dynamics of the spin-evolution of the system. In viscous medium the rotational diffusion slows down and the MFE becomes dependent on the direction of the Field with respect to the exciplex.
Jan Subrt - One of the best experts on this subject based on the ideXlab platform.
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Effect of 2 propenyltrimethylsilane and Magnetic Field Effect on photochemical fe co fine particle formation from a ternary gaseous mixture
Journal of Photochemistry and Photobiology A-chemistry, 2011Co-Authors: Hiroshi Morita, Koh Hattori, Jan SubrtAbstract:Abstract From a gaseous mixture of iron pentacarbonyl (Fe(CO) 5 ), cobalt tricarbonyl nitrosyl (Co(CO) 3 NO), and 2-propenyltrimethylsilane (allyltrimethylsilane) (ATMeSi), spherical aerosol particles with a mean diameter of 0.36 μm were produced under UV light irradiation. Addition of ATMeSi accelerated the chemical reactions of Co(CO) 3 NO to produce aerosol particles efficiently, and decelerated those of Fe(CO) 5 to inhibit the formation of crystalline deposits which were mainly composed of Fe 2 (CO) 9 structure involving Fe–C( O)–Co bond. Chemical structure and chemical compositions of the sedimentary aerosol particles were investigated from FT-IR and SEM–EDS analyses. Co species were rich in the sedimentary particles, and efficient excitation of Co(CO) 3 NO molecules at 355 nm with a Nd:YAG laser resulted in a greater abundance of Co species. Under a Magnetic Field of up to 5 T, sedimentary aerosol particles were synthesized from the ternary gaseous mixture. Chemical composition of the particles was dependent on Magnetic Field strength, and atomic ratios of Fe and Si to Co atom increased above 3 T. Magnetic Field Effect on the nucleation reactions was discussed briefly.
