The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
Z A Schelly - One of the best experts on this subject based on the ideXlab platform.
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experimental determination of the effect of polarization of the heating laser pulse on the characteristic Decay Time Constant and focal length of thermal lenses and on the thermal diffusivities in pure liquids
Chemical Physics Letters, 1994Co-Authors: H M Chen, Z A SchellyAbstract:Abstract The characteristic Decay Time Constant of defocusing thermal lenses was determined in pure benzene, water, chloroform and nitrobenzene, with the use of non-polarized single heating pulses of a Nd:YAG laser. From the characteristic Time Constants, the thermal diffusivities were calculated and compared with those obtained through the known values of thermal Constants of the homogeneous liquids. From the course of Decay of the thermal lenses, their focal lengths at the beginning of the Decay process were determined. Generally, the characteristic Decay Time Constants were found to be smaller, the focal lengths longer, and the thermal diffusivities greater with polarized than with non-polarized heating pulses. The difference is interpreted in terms of the unidirectional alignment of induced dipoles by the linearly polarized heating pulse.
L Schlapbach - One of the best experts on this subject based on the ideXlab platform.
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simultaneous measurement of the maximum oscillation amplitude and the transient Decay Time Constant of the qcm reveals stiffness changes of the adlayer
Analytical and Bioanalytical Chemistry, 2003Co-Authors: Galli C Marxer, Collaud M Coen, H Bissig, Urs F Greber, L SchlapbachAbstract:Interpretation of adsorption kinetics measured with a quartz crystal microbalance (QCM) can be difficult for adlayers undergoing modification of their mechanical properties. We have studied the behavior of the oscillation amplitude, A0, and the Decay Time Constant, τ, of quartz during adsorption of proteins and cells, by use of a home-made QCM. We are able to measure simultaneously the frequency, f, the dissipation factor, D, the maximum amplitude, A0, and the transient Decay Time Constant, τ, every 300 ms in liquid, gaseous, or vacuum environments. This analysis enables adsorption and modification of liquid/mass properties to be distinguished. Moreover the surface coverage and the stiffness of the adlayer can be estimated. These improvements promise to increase the appeal of QCM methodology for any applications measuring intimate contact of a dynamic material with a solid surface.
H M Chen - One of the best experts on this subject based on the ideXlab platform.
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experimental determination of the effect of polarization of the heating laser pulse on the characteristic Decay Time Constant and focal length of thermal lenses and on the thermal diffusivities in pure liquids
Chemical Physics Letters, 1994Co-Authors: H M Chen, Z A SchellyAbstract:Abstract The characteristic Decay Time Constant of defocusing thermal lenses was determined in pure benzene, water, chloroform and nitrobenzene, with the use of non-polarized single heating pulses of a Nd:YAG laser. From the characteristic Time Constants, the thermal diffusivities were calculated and compared with those obtained through the known values of thermal Constants of the homogeneous liquids. From the course of Decay of the thermal lenses, their focal lengths at the beginning of the Decay process were determined. Generally, the characteristic Decay Time Constants were found to be smaller, the focal lengths longer, and the thermal diffusivities greater with polarized than with non-polarized heating pulses. The difference is interpreted in terms of the unidirectional alignment of induced dipoles by the linearly polarized heating pulse.
K. Aihara - One of the best experts on this subject based on the ideXlab platform.
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Switched-capacitor multi-internal-state chaotic neuron circuit with unipolar and bipolar output functions
1999 IEEE International Symposium on Circuits and Systems (ISCAS), 1999Co-Authors: Y. Horio, I. Kobayashi, M. Kawakami, H. Hayashi, K. AiharaAbstract:A switched-capacitor circuit implementation of the multi-internal-state chaotic neuron model is proposed. The Decay Time Constant for each internal state can be determined separately by the external signals. Furthermore, the proposed circuit has both the bipolar and unipolar output functions realized by a simple nonlinear function circuit. One of the two output functions can be externally selected. Moreover, the saturation levels and center gain of the functions can be altered by the external voltages. The proposed circuit is fabricated through MOSIS using 1.2 /spl mu/m CMOS technology. Results from the chip is shown.
Galli C Marxer - One of the best experts on this subject based on the ideXlab platform.
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simultaneous measurement of the maximum oscillation amplitude and the transient Decay Time Constant of the qcm reveals stiffness changes of the adlayer
Analytical and Bioanalytical Chemistry, 2003Co-Authors: Galli C Marxer, Collaud M Coen, H Bissig, Urs F Greber, L SchlapbachAbstract:Interpretation of adsorption kinetics measured with a quartz crystal microbalance (QCM) can be difficult for adlayers undergoing modification of their mechanical properties. We have studied the behavior of the oscillation amplitude, A0, and the Decay Time Constant, τ, of quartz during adsorption of proteins and cells, by use of a home-made QCM. We are able to measure simultaneously the frequency, f, the dissipation factor, D, the maximum amplitude, A0, and the transient Decay Time Constant, τ, every 300 ms in liquid, gaseous, or vacuum environments. This analysis enables adsorption and modification of liquid/mass properties to be distinguished. Moreover the surface coverage and the stiffness of the adlayer can be estimated. These improvements promise to increase the appeal of QCM methodology for any applications measuring intimate contact of a dynamic material with a solid surface.
