The Experts below are selected from a list of 36831 Experts worldwide ranked by ideXlab platform
Paul Linden - One of the best experts on this subject based on the ideXlab platform.
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Laboratory modelling of the effects of temporal changes of estuarine-fresh-water Discharge rates on the propagation speed of oceanographic coastal currents
Journal of Fluid Mechanics, 2010Co-Authors: Peter J. Thomas, Paul LindenAbstract:In this paper, results of laboratory experiments simulating buoyancy-driven coastal currents produced by estuarine Discharges into the ocean, are discussed. The responses of the propagation speeds of the currents to increases and decreases of the volumetric Discharge rate at the source are investigated. For increasing Discharge rate, we find that the mean speed of the current head displays a sharp rise some time after the source Discharge Condition has changed. In contrast, a decrease of the current speed following a decreasing Discharge rate proceeds gradually. The current speed after acceleration or deceleration is found to be equal to the speed that would be expected had the Discharge been at the higher or lower rate from the start of the experiment. The relative speed at which the information of the changed Discharge Condition at the source approaches the advancing current head from upstream, for both increasing and decreasing Discharge rates, is found to be approximately one to three times the mean speed of the current. Further, we find that this transmission speed is 0.82 +/- 0.20 times the propagation speed of a linear, long interfacial Kelvin wave.
Ikuo Yonezu - One of the best experts on this subject based on the ideXlab platform.
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study on the anode behavior of sn and sn cu alloy thin film electrodes
Journal of Power Sources, 2002Co-Authors: Noriyuki Tamura, Ryuji Ohshita, Masahisa Fujimoto, Shin Fujitani, Maruo Kamino, Ikuo YonezuAbstract:Abstract Anodes based on tin metal powder offer large specific capacity, but also exhibit large irreversible capacity and poor cycle performance. In order to use them as a negative electrode for lithium secondary batteries, we focused on the electrodepositing process and investigated an electrodeposited tin layer on copper foil. In the full charge–Discharge Condition, charging and discharging between 0 and 2.0 V versus Li/Li+, the first Discharge capacity was 940 mAh g−1, which was 2.5 times as large as that of graphite, and the coulomb efficiency in the first cycle was 93%, but its cycle performance was not improved. In order to enhance the interface strength between the active material and the copper foil, we investigated an anode which was fabricated by annealing an as-deposited anode. In the full charge–Discharge Condition, the first charge–Discharge characteristics were almost equivalent to the as-deposited anode, and the retention capacity ratio after 10 cycles was improved from 20 to 94%. It is considered that this improvement resulted from the formation of two different tin–copper intermetallic compound layers between the tin layer and the copper current collector due to the heat treatment. A small cell using this annealed anode as a negative electrode was also investigated. This cell offered good cycle performance for the first 20 cycles.
Peter J. Thomas - One of the best experts on this subject based on the ideXlab platform.
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Laboratory modelling of the effects of temporal changes of estuarine-fresh-water Discharge rates on the propagation speed of oceanographic coastal currents
Journal of Fluid Mechanics, 2010Co-Authors: Peter J. Thomas, Paul LindenAbstract:In this paper, results of laboratory experiments simulating buoyancy-driven coastal currents produced by estuarine Discharges into the ocean, are discussed. The responses of the propagation speeds of the currents to increases and decreases of the volumetric Discharge rate at the source are investigated. For increasing Discharge rate, we find that the mean speed of the current head displays a sharp rise some time after the source Discharge Condition has changed. In contrast, a decrease of the current speed following a decreasing Discharge rate proceeds gradually. The current speed after acceleration or deceleration is found to be equal to the speed that would be expected had the Discharge been at the higher or lower rate from the start of the experiment. The relative speed at which the information of the changed Discharge Condition at the source approaches the advancing current head from upstream, for both increasing and decreasing Discharge rates, is found to be approximately one to three times the mean speed of the current. Further, we find that this transmission speed is 0.82 +/- 0.20 times the propagation speed of a linear, long interfacial Kelvin wave.
A Corazza - One of the best experts on this subject based on the ideXlab platform.
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Investigation on the effect of impurities in xenon based dielectric barrier Discharge lamps
Journal of Physics D: Applied Physics, 2010Co-Authors: A N Dagang, S Bhosle, G Zissis, A CorazzaAbstract:In any Discharges, the existence of impurities could give a severe change or bring a negative or positive effect to the Discharge and plasma characteristics. The authors purposely added a few kinds of impurities and their effect on the Discharge was investigated. The common and typical impurities of H 2, N 2, CO 2 and CH 4 were applied in varying concentration percentages into a xenon DBD lamp. Their Discharge Condition, emission spectra and electrical characteristics were studied. The plasma generation differs from one type of impurity to another. With two different concentrations of hydrogen, at 5% concentration it would stabilize the Discharge and at 0.5% concentrations it would give an additional collision process where a strong peak of atomic lines were observed. Nitrogen with two types of concentration i.e., 1% and 0.1% gives two kinds of characteristics in emission spectroscopy. From the electrical parameters, the voltage across the gap shows the lamps with impurities have a higher value compared to the pure xenon lamp.
Noriyuki Tamura - One of the best experts on this subject based on the ideXlab platform.
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study on the anode behavior of sn and sn cu alloy thin film electrodes
Journal of Power Sources, 2002Co-Authors: Noriyuki Tamura, Ryuji Ohshita, Masahisa Fujimoto, Shin Fujitani, Maruo Kamino, Ikuo YonezuAbstract:Abstract Anodes based on tin metal powder offer large specific capacity, but also exhibit large irreversible capacity and poor cycle performance. In order to use them as a negative electrode for lithium secondary batteries, we focused on the electrodepositing process and investigated an electrodeposited tin layer on copper foil. In the full charge–Discharge Condition, charging and discharging between 0 and 2.0 V versus Li/Li+, the first Discharge capacity was 940 mAh g−1, which was 2.5 times as large as that of graphite, and the coulomb efficiency in the first cycle was 93%, but its cycle performance was not improved. In order to enhance the interface strength between the active material and the copper foil, we investigated an anode which was fabricated by annealing an as-deposited anode. In the full charge–Discharge Condition, the first charge–Discharge characteristics were almost equivalent to the as-deposited anode, and the retention capacity ratio after 10 cycles was improved from 20 to 94%. It is considered that this improvement resulted from the formation of two different tin–copper intermetallic compound layers between the tin layer and the copper current collector due to the heat treatment. A small cell using this annealed anode as a negative electrode was also investigated. This cell offered good cycle performance for the first 20 cycles.