The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
Huseyin Ozkaramanli - One of the best experts on this subject based on the ideXlab platform.
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On the Phase Condition and its solution for Hilbert transform pairs of wavelet bases
IEEE Transactions on Signal Processing, 2003Co-Authors: Huseyin OzkaramanliAbstract:In this paper, the Phase Condition on the scaling filters of two wavelet bases that renders the corresponding wavelets as Hilbert transform pairs is studied. An alternative and equivalent Phase Condition is derived. With the equivalent Condition and using Fourier series expansions, we show that the solution for which the corresponding scaling filters are offset from one another by a half sample is the only solution satisfying the Phase Condition.
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ICASSP (6) - On the Phase Condition and its solution for Hilbert transform pairs of wavelets bases
2003 IEEE International Conference on Acoustics Speech and Signal Processing 2003. Proceedings. (ICASSP '03)., 1Co-Authors: Huseyin OzkaramanliAbstract:In this work, the Phase Condition on the scaling filters of two wavelet bases which ensures that the corresponding wavelets are Hilbert transform pairs of each other is studied. An alternative and equivalent Phase Condition is derived. With the equivalent Condition and Fourier series expansions, it is shown that the solution for which the corresponding scaling filters are offset from one another by a half sample is the only solution satisfying the Phase Condition which results in Hilbert transform pairs of wavelet bases.
Myung Ho Hyun - One of the best experts on this subject based on the ideXlab platform.
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Resolution of beta-blockers on a chiral stationary Phase based on (+)-(18-crown-6)-2,3,11,12-tetracarboxylic acid: unusual temperature effect.
Journal of chromatography. A, 2005Co-Authors: Dandan Zhang, Hee Jung Choi, Do Hun Kim, Myung Ho HyunAbstract:A chiral stationary Phase (CSP) based on (+)-(18-crown-6)-2,3,11,12-tetracarboxylic acid has been successfully employed in the liquid chromatographic resolution of eleven beta-blockers containing a secondary amino functional group. As the result of an effort to find out the optimal mobile Phase Condition, the mixture of trifluoroacetic acid-triethylamine-ethanol-acetonitrile with the ratio of 0.1/0.5/20/80 (v/v/v/v) was concluded to be the best mobile Phase Condition, the separation (alpha) and the resolution factors (Rs) for the resolution of 11 beta-blockers being in the range of 1.13-1.85 and 1.36-5.79, respectively. Surprisingly, in contrast to the resolution of other racemic compounds containing a primary amino functional group, the separation factors (alpha) for the resolution of beta-blockers were observed to improve as the column temperature increased and these unusual chromatographic behaviors were rationalized as the entropically controlled enantioselectivity.
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Resolution of β-blockers on a chiral stationary Phase based on (+)-(18-crown-6)-2,3,11,12-tetracarboxylic acid: Unusual temperature effect
Journal of Chromatography A, 2005Co-Authors: Dandan Zhang, Hun Kim, Hee Jung Choi, Myung Ho HyunAbstract:Abstract A chiral stationary Phase (CSP) based on (+)-(18-crown-6)-2,3,11,12-tetracarboxylic acid has been successfully employed in the liquid chromatographic resolution of eleven β-blockers containing a secondary amino functional group. As the result of an effort to find out the optimal mobile Phase Condition, the mixture of trifluoroacetic acid–triethylamine–ethanol–acetonitrile with the ratio of 0.1/0.5/20/80 (v/v/v/v) was concluded to be the best mobile Phase Condition, the separation (α) and the resolution factors (RS) for the resolution of 11 β-blockers being in the range of 1.13–1.85 and 1.36–5.79, respectively. Surprisingly, in contrast to the resolution of other racemic compounds containing a primary amino functional group, the separation factors (α) for the resolution of β-blockers were observed to improve as the column temperature increased and these unusual chromatographic behaviors were rationalized as the entropically controlled enantioselectivity.
O. Pompeiano - One of the best experts on this subject based on the ideXlab platform.
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Adaptive modification of the cat's vestibulospinal reflex during sustained vestibular and neck stimulation
Pflügers Archiv, 1993Co-Authors: P. Andre, P. D'ascanio, D. Manzoni, O. PompeianoAbstract:In decerebrate cats, rotation about the longitudinal axis of the whole animal at 0.15 Hz,±10° produced an increased electromyogram (EMG) activity of the triceps brachii during side-down tilt and a decreased activity during side-up tilt. This vestibulospinal reflex (VSR) was tested before, during and after a sustained (3-h) period of roll tilt of the head at the parameters indicated above, associated with a synchronous roll tilt of the body at 0.15 Hz, but at the peak amplitude of either 12.5° or 7.5°. This additional stimulus led to 2.5° of neck rotation, which was respectively out of Phase (Condition A) or in-Phase (Condition B) with head rotation. In a few instances the peak amplitude of neck rotation was increased to 5°. In the first experimental Condition A, the gain of the VSR (tested every 10–15 min) progressively increased, starting from the first hour of out of Phase neck-vestibular stimulation to reach, on average, 241% of the control value at the end of the third hour of stimulation. On the other hand, in the second experimental Condition B, the mean gain of the VSR first decreased to 82% during the first hour of in-Phase neck-vestibular stimulation, but then increased to 165% of the corresponding control during the last hour of recording. In other experiments an adaptive increase in gain of the pure VSR occurred during a sustained (3-h) period of selective roll tilt of the whole animal, but it was less consistent and, on average, smaller in amplitude than that obtained during out of Phase neck-vestibular stimulation. The adaptive changes in gain of the VSR described above were not associated with changes in the Phase angle of the responses, and were also observed during the post-adaptation period. Further experiments indicated that the gain of the N-VSR, i. e. of the EMG responses to combined neck-vestibular stimulation, displayed a prominent adaptive increase during the sustained out of Phase stimulation, but not during the inPhase stimulation.
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Adaptive modification of the cat's vestibulospinal reflex during sustained vestibular and neck stimulation.
Pflugers Archiv : European journal of physiology, 1993Co-Authors: P. Andre, P. D'ascanio, D. Manzoni, O. PompeianoAbstract:In decerebrate cats, rotation about the longitudinal axis of the whole animal at 0.15 Hz, +/- 10 degrees produced an increased electromyogram (EMG) activity of the triceps brachii during side-down tilt and a decreased activity during side-up tilt. This vestibulospinal reflex (VSR) was tested before, during and after a sustained (3-h) period of roll tilt of the head at the parameters indicated above, associated with a synchronous roll tilt of the body at 0.15 Hz, but at the peak amplitude of either 12.5 degrees or 7.5 degrees. This additional stimulus led to 2.5 degrees of neck rotation, which was respectively out of Phase (Condition A) or in-Phase (Condition B) with head rotation. In a few instances the peak amplitude of neck rotation was increased to 5 degrees. In the first experimental Condition A, the gain of the VSR (tested every 10-15 min) progressively increased, starting from the first hour of out of Phase neck-vestibular stimulation to reach, on average, 241% of the control value at the end of the third hour of stimulation. On the other hand, in the second experimental Condition B, the mean gain of the VSR first decreased to 82% during the first hour of in-Phase neck-vestibular stimulation, but then increased to 165% of the corresponding control during the last hour of recording. In other experiments an adaptive increase in gain of the pure VSR occurred during a sustained (3-h) period of selective roll tilt of the whole animal, but it was less consistent and, on average, smaller in amplitude than that obtained during out of Phase neck-vestibular stimulation. The adaptive changes in gain of the VSR described above were not associated with changes in the Phase angle of the responses, and were also observed during the post-adaptation period. Further experiments indicated that the gain of the N-VSR, i.e. of the EMG responses to combined neck-vestibular stimulation, displayed a prominent adaptive increase during the sustained out of Phase stimulation, but not during the in Phase stimulation.
Dandan Zhang - One of the best experts on this subject based on the ideXlab platform.
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Resolution of beta-blockers on a chiral stationary Phase based on (+)-(18-crown-6)-2,3,11,12-tetracarboxylic acid: unusual temperature effect.
Journal of chromatography. A, 2005Co-Authors: Dandan Zhang, Hee Jung Choi, Do Hun Kim, Myung Ho HyunAbstract:A chiral stationary Phase (CSP) based on (+)-(18-crown-6)-2,3,11,12-tetracarboxylic acid has been successfully employed in the liquid chromatographic resolution of eleven beta-blockers containing a secondary amino functional group. As the result of an effort to find out the optimal mobile Phase Condition, the mixture of trifluoroacetic acid-triethylamine-ethanol-acetonitrile with the ratio of 0.1/0.5/20/80 (v/v/v/v) was concluded to be the best mobile Phase Condition, the separation (alpha) and the resolution factors (Rs) for the resolution of 11 beta-blockers being in the range of 1.13-1.85 and 1.36-5.79, respectively. Surprisingly, in contrast to the resolution of other racemic compounds containing a primary amino functional group, the separation factors (alpha) for the resolution of beta-blockers were observed to improve as the column temperature increased and these unusual chromatographic behaviors were rationalized as the entropically controlled enantioselectivity.
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Resolution of β-blockers on a chiral stationary Phase based on (+)-(18-crown-6)-2,3,11,12-tetracarboxylic acid: Unusual temperature effect
Journal of Chromatography A, 2005Co-Authors: Dandan Zhang, Hun Kim, Hee Jung Choi, Myung Ho HyunAbstract:Abstract A chiral stationary Phase (CSP) based on (+)-(18-crown-6)-2,3,11,12-tetracarboxylic acid has been successfully employed in the liquid chromatographic resolution of eleven β-blockers containing a secondary amino functional group. As the result of an effort to find out the optimal mobile Phase Condition, the mixture of trifluoroacetic acid–triethylamine–ethanol–acetonitrile with the ratio of 0.1/0.5/20/80 (v/v/v/v) was concluded to be the best mobile Phase Condition, the separation (α) and the resolution factors (RS) for the resolution of 11 β-blockers being in the range of 1.13–1.85 and 1.36–5.79, respectively. Surprisingly, in contrast to the resolution of other racemic compounds containing a primary amino functional group, the separation factors (α) for the resolution of β-blockers were observed to improve as the column temperature increased and these unusual chromatographic behaviors were rationalized as the entropically controlled enantioselectivity.
P. Andre - One of the best experts on this subject based on the ideXlab platform.
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Adaptive modification of the cat's vestibulospinal reflex during sustained vestibular and neck stimulation
Pflügers Archiv, 1993Co-Authors: P. Andre, P. D'ascanio, D. Manzoni, O. PompeianoAbstract:In decerebrate cats, rotation about the longitudinal axis of the whole animal at 0.15 Hz,±10° produced an increased electromyogram (EMG) activity of the triceps brachii during side-down tilt and a decreased activity during side-up tilt. This vestibulospinal reflex (VSR) was tested before, during and after a sustained (3-h) period of roll tilt of the head at the parameters indicated above, associated with a synchronous roll tilt of the body at 0.15 Hz, but at the peak amplitude of either 12.5° or 7.5°. This additional stimulus led to 2.5° of neck rotation, which was respectively out of Phase (Condition A) or in-Phase (Condition B) with head rotation. In a few instances the peak amplitude of neck rotation was increased to 5°. In the first experimental Condition A, the gain of the VSR (tested every 10–15 min) progressively increased, starting from the first hour of out of Phase neck-vestibular stimulation to reach, on average, 241% of the control value at the end of the third hour of stimulation. On the other hand, in the second experimental Condition B, the mean gain of the VSR first decreased to 82% during the first hour of in-Phase neck-vestibular stimulation, but then increased to 165% of the corresponding control during the last hour of recording. In other experiments an adaptive increase in gain of the pure VSR occurred during a sustained (3-h) period of selective roll tilt of the whole animal, but it was less consistent and, on average, smaller in amplitude than that obtained during out of Phase neck-vestibular stimulation. The adaptive changes in gain of the VSR described above were not associated with changes in the Phase angle of the responses, and were also observed during the post-adaptation period. Further experiments indicated that the gain of the N-VSR, i. e. of the EMG responses to combined neck-vestibular stimulation, displayed a prominent adaptive increase during the sustained out of Phase stimulation, but not during the inPhase stimulation.
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Adaptive modification of the cat's vestibulospinal reflex during sustained vestibular and neck stimulation.
Pflugers Archiv : European journal of physiology, 1993Co-Authors: P. Andre, P. D'ascanio, D. Manzoni, O. PompeianoAbstract:In decerebrate cats, rotation about the longitudinal axis of the whole animal at 0.15 Hz, +/- 10 degrees produced an increased electromyogram (EMG) activity of the triceps brachii during side-down tilt and a decreased activity during side-up tilt. This vestibulospinal reflex (VSR) was tested before, during and after a sustained (3-h) period of roll tilt of the head at the parameters indicated above, associated with a synchronous roll tilt of the body at 0.15 Hz, but at the peak amplitude of either 12.5 degrees or 7.5 degrees. This additional stimulus led to 2.5 degrees of neck rotation, which was respectively out of Phase (Condition A) or in-Phase (Condition B) with head rotation. In a few instances the peak amplitude of neck rotation was increased to 5 degrees. In the first experimental Condition A, the gain of the VSR (tested every 10-15 min) progressively increased, starting from the first hour of out of Phase neck-vestibular stimulation to reach, on average, 241% of the control value at the end of the third hour of stimulation. On the other hand, in the second experimental Condition B, the mean gain of the VSR first decreased to 82% during the first hour of in-Phase neck-vestibular stimulation, but then increased to 165% of the corresponding control during the last hour of recording. In other experiments an adaptive increase in gain of the pure VSR occurred during a sustained (3-h) period of selective roll tilt of the whole animal, but it was less consistent and, on average, smaller in amplitude than that obtained during out of Phase neck-vestibular stimulation. The adaptive changes in gain of the VSR described above were not associated with changes in the Phase angle of the responses, and were also observed during the post-adaptation period. Further experiments indicated that the gain of the N-VSR, i.e. of the EMG responses to combined neck-vestibular stimulation, displayed a prominent adaptive increase during the sustained out of Phase stimulation, but not during the in Phase stimulation.
