The Experts below are selected from a list of 17460 Experts worldwide ranked by ideXlab platform
Kevin E Bennet - One of the best experts on this subject based on the ideXlab platform.
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fast cyclic Square wave voltammetry to enhance neurotransmitter selectivity and sensitivity
Analytical Chemistry, 2018Co-Authors: Cheonho Park, Hojin Shin, Jaekyung Kim, Yumin Kang, Jeongeun Sim, Hyun U Cho, Han Kyu Lee, Sung Jun Jung, Charles D Blaha, Kevin E BennetAbstract:Although fast-scan cyclic voltammetry (FSCV) has been widely used for in vivo neurochemical detection, the sensitivity and selectivity of the technique can be further improved. In this study, we develop fast cyclic Square-wave voltammetry (FCSWV) as a novel voltammetric technique that combines large-amplitude cyclic Square-wave voltammetry (CSWV) with background subtraction. A large-amplitude, Square-shaped potential was applied to induce cycling through multiple redox reactions within a Square Pulse to increase sensitivity and selectivity when combined with a two-dimensional voltammogram. As a result, FCSWV was significantly more sensitive than FSCV (n = 5 electrodes, two-way ANOVA, p = 0.0002). In addition, FCSWV could differentiate dopamine from other catecholamines (e.g., epinephrine and norepinephrine) and serotonin better than conventional FSCV. With the confirmation that FCSWV did not influence local neuronal activity, despite the large amplitude of the Square waveform, it could monitor electricall...
Cheonho Park - One of the best experts on this subject based on the ideXlab platform.
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fast cyclic Square wave voltammetry to enhance neurotransmitter selectivity and sensitivity
Analytical Chemistry, 2018Co-Authors: Cheonho Park, Hojin Shin, Jaekyung Kim, Yumin Kang, Jeongeun Sim, Hyun U Cho, Han Kyu Lee, Sung Jun Jung, Charles D Blaha, Kevin E BennetAbstract:Although fast-scan cyclic voltammetry (FSCV) has been widely used for in vivo neurochemical detection, the sensitivity and selectivity of the technique can be further improved. In this study, we develop fast cyclic Square-wave voltammetry (FCSWV) as a novel voltammetric technique that combines large-amplitude cyclic Square-wave voltammetry (CSWV) with background subtraction. A large-amplitude, Square-shaped potential was applied to induce cycling through multiple redox reactions within a Square Pulse to increase sensitivity and selectivity when combined with a two-dimensional voltammogram. As a result, FCSWV was significantly more sensitive than FSCV (n = 5 electrodes, two-way ANOVA, p = 0.0002). In addition, FCSWV could differentiate dopamine from other catecholamines (e.g., epinephrine and norepinephrine) and serotonin better than conventional FSCV. With the confirmation that FCSWV did not influence local neuronal activity, despite the large amplitude of the Square waveform, it could monitor electricall...
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Fast Cyclic Square-Wave Voltammetry To Enhance Neurotransmitter Selectivity and Sensitivity
2018Co-Authors: Cheonho Park, Hojin Shin, Jaekyung Kim, Yumin Kang, Jeongeun Sim, Hyun U Cho, Han Kyu Lee, Sung Jun Jung, Charles D BlahaAbstract:Although fast-scan cyclic voltammetry (FSCV) has been widely used for in vivo neurochemical detection, the sensitivity and selectivity of the technique can be further improved. In this study, we develop fast cyclic Square-wave voltammetry (FCSWV) as a novel voltammetric technique that combines large-amplitude cyclic Square-wave voltammetry (CSWV) with background subtraction. A large-amplitude, Square-shaped potential was applied to induce cycling through multiple redox reactions within a Square Pulse to increase sensitivity and selectivity when combined with a two-dimensional voltammogram. As a result, FCSWV was significantly more sensitive than FSCV (n = 5 electrodes, two-way ANOVA, p = 0.0002). In addition, FCSWV could differentiate dopamine from other catecholamines (e.g., epinephrine and norepinephrine) and serotonin better than conventional FSCV. With the confirmation that FCSWV did not influence local neuronal activity, despite the large amplitude of the Square waveform, it could monitor electrically induced phasic changes in dopamine release in rat striatum before and after injecting nomifensine, a dopamine reuptake inhibitor
Masazumi Okido - One of the best experts on this subject based on the ideXlab platform.
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improvement in corrosion characteristics of az31 mg alloy by Square Pulse anodizing between transpassive and active regions
Corrosion Science, 2012Co-Authors: Yunil Choi, S A Salman, Kensuke Kuroda, Masazumi OkidoAbstract:Abstract Anodizing was carried out in 2 M NaOH with Square Pulses of different duty ratios between the transpassive (10 V Ag/AgCl ) and active regions (−1.35 V Ag/AgCl ) of AZ31 Mg alloy. It was found that, a duty ratio of 91 for 600 s afforded the highest E pit of −1.366 V Ag/AgCl , lowest i corr of 17.06 μA cm −2 , and highest R p of 0.46 kΩ cm 2 in 0.1 M NaCl. Furthermore, the micro-pores were effectively filled with anodic films by the Pulse potentials, thus the surface porosity was decreased approximately 11 times than that obtained with a constant potential.
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improvement in corrosion characteristics of az31 mg alloy by Square Pulse anodizing between transpassive and active regions
Meeting Abstracts, 2012Co-Authors: Yunil Choi, S A Salman, Kensuke Kuroda, Masazumi OkidoAbstract:Mg and its alloys are front runners in addressing strong current need for lightweight materials in industries such as automobiles, aerospace, and electronics because of their favorable characteristics: low density, high specific strength-to-weight ratio, electromagnetic interference shielding properties, good formability, and recyclability. Despite of these competitive advantages over rival conventional materials, the applications are still restricted due to their extremely negative equilibrium potential and high corrosion susceptibility in chloride-containing environment. One well-known industrial technology for surface protection of valve metals is anodizing. However, film growth during anodizing involves the formation of a Mg(OH)2 barrier layer, followed by the formation of pores in it. In this study, we describe a novel anodizing technique that significantly limits the formation of micropores on the anodic films and thereby increases the corrosion resistance. A Square Pulse potential between the transpassive region (10 VAg/AgCl) and active region (-1.35 VAg/AgCl) was applied on the electrode surface with different duty ratios α in 2 M NaOH at 303 K. At the initial stages of anodizing, the corrosion resistance increased as α decreased due to the increase in mean current density. However, the absolute anodizing time became a significant parameter as the anodizing time progressed. Therefore, the corrosion resistance of specimens anodized at low α deteriorated, whereas that of specimens anodized at high α improved with the anodizing time. However, it was noticeable that the specimen anodized at an α of 91 for 600 s exhibited the best corrosion resistance, which was confirmed to be due to the decrease in pore size and surface porosity of the anodic film. The maximum pore diameter was less than 1 μm and the surface porosity was about 11 times lower than that for samples anodized at a constant voltage. This smooth anodic film on the AZ31 Mg alloy arises presumably because the intermittent desorption of Mg 2+ during the anodizing process achieved counter-balance with the formation of the anodic film. In the other words, the artificial formation of Mg 2+ during the anodizing process may remove the weak spots of the formed anodic film layer by potential edge effect and thereby increase the concentration of reactant species near the electrode/electrolyte interface. This dissolved Mg 2+ seems
François Sanchez - One of the best experts on this subject based on the ideXlab platform.
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Theory of passively-mode-locked fiber lasers with phase-modulated Square Pulses
Physical Review A, 2017Co-Authors: Andrey Komarov, Alexander Dmitriev, Konstantin Komarov, Dmitry Meshcheriakov, Georges Semaan, François SanchezAbstract:We present results of the analysis of Square Pulses generated in passively-mode-locked lasers under dissipative-soliton-resonance conditions. The master equation used in this work takes into account the gain saturation, the quadratic frequency dispersion of the gain and the refractive index, and the cubic-quintic nonlinearity of the losses and refractive index. The phase modulation effects are defined as a perturbation to the solution of this equation that has the form of a Square Pulse without phase modulation. An analytical dependence of the change in the carrier frequency of the radiation along the Pulse is found. Conditions for the occurrence of the singlet and doublet spectra of the Square Pulse are determined. The mechanisms responsible for the occurrence of this regime are analyzed. The obtained analytical dependencies are in good agreement with the results of numerical simulation.
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10 μJ dissipative soliton resonance Square Pulse in a dual amplifier figure-of-eight double-clad Er:Yb mode-locked fiber laser
Optics Letters, 2016Co-Authors: Georges Semaan, Fatma Ben Braham, Jorel Fourmont, Mohamed Salhi, Faouzi Bahloul, François SanchezAbstract:We demonstrate experimentally a double-clad Er:Yb co-doped dual amplifier passive mode-locked figure-of-eight fiber laser that generates high energy, width, and amplitude tunable dissipative soliton resonance Square Pulses. In our laser system, each loop contains an amplifier that controls a characteristic of the output Pulse. The amplitude and width of the output beam can be controlled continuously but, dependently, according to the pump power of each amplifier. The Pulse width can be tuned in a range of almost 360 ns while the peak power varies from 8 to 120 W. On maximum possible pumping from both sides without having a Pulse break, we report Square Pulses with 10 μJ energy per Pulse with a signal-to-noise ratio of 60 dB.
Charles D Blaha - One of the best experts on this subject based on the ideXlab platform.
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fast cyclic Square wave voltammetry to enhance neurotransmitter selectivity and sensitivity
Analytical Chemistry, 2018Co-Authors: Cheonho Park, Hojin Shin, Jaekyung Kim, Yumin Kang, Jeongeun Sim, Hyun U Cho, Han Kyu Lee, Sung Jun Jung, Charles D Blaha, Kevin E BennetAbstract:Although fast-scan cyclic voltammetry (FSCV) has been widely used for in vivo neurochemical detection, the sensitivity and selectivity of the technique can be further improved. In this study, we develop fast cyclic Square-wave voltammetry (FCSWV) as a novel voltammetric technique that combines large-amplitude cyclic Square-wave voltammetry (CSWV) with background subtraction. A large-amplitude, Square-shaped potential was applied to induce cycling through multiple redox reactions within a Square Pulse to increase sensitivity and selectivity when combined with a two-dimensional voltammogram. As a result, FCSWV was significantly more sensitive than FSCV (n = 5 electrodes, two-way ANOVA, p = 0.0002). In addition, FCSWV could differentiate dopamine from other catecholamines (e.g., epinephrine and norepinephrine) and serotonin better than conventional FSCV. With the confirmation that FCSWV did not influence local neuronal activity, despite the large amplitude of the Square waveform, it could monitor electricall...
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Fast Cyclic Square-Wave Voltammetry To Enhance Neurotransmitter Selectivity and Sensitivity
2018Co-Authors: Cheonho Park, Hojin Shin, Jaekyung Kim, Yumin Kang, Jeongeun Sim, Hyun U Cho, Han Kyu Lee, Sung Jun Jung, Charles D BlahaAbstract:Although fast-scan cyclic voltammetry (FSCV) has been widely used for in vivo neurochemical detection, the sensitivity and selectivity of the technique can be further improved. In this study, we develop fast cyclic Square-wave voltammetry (FCSWV) as a novel voltammetric technique that combines large-amplitude cyclic Square-wave voltammetry (CSWV) with background subtraction. A large-amplitude, Square-shaped potential was applied to induce cycling through multiple redox reactions within a Square Pulse to increase sensitivity and selectivity when combined with a two-dimensional voltammogram. As a result, FCSWV was significantly more sensitive than FSCV (n = 5 electrodes, two-way ANOVA, p = 0.0002). In addition, FCSWV could differentiate dopamine from other catecholamines (e.g., epinephrine and norepinephrine) and serotonin better than conventional FSCV. With the confirmation that FCSWV did not influence local neuronal activity, despite the large amplitude of the Square waveform, it could monitor electrically induced phasic changes in dopamine release in rat striatum before and after injecting nomifensine, a dopamine reuptake inhibitor
