Results 261 to 270 of about 2,716,717 (297)

Thermal-blooming time constant

Journal of the Optical Society of America, 1982
Thermal blooming is analyzed by using a wave-propagation code to determine the speed of response of the blooming effect to changes in the transmitted laser beam. Results are developed to indicate where along the propagation path the dominant part of the thermal-blooming effects arise.
David L. Fried, Gus E. Mevers
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Stator thermal time constant

49th IEEE/IAS Industrial & Commercial Power Systems Technical Conference, 2013
The thermal model providing motor overload protection is derived from the first order differential equation for heat rise due to current in a conductor. Only the stator thermal time constant and the service factor are the required settings. The thermal model utilizes the full thermal capacity of the motor and allows current swings and cyclic overloads ...
Jon Steinmetz, Subhash C. Patel, Stanley E. Zocholl   +2 more
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Time-Dependent Thermal Convection

Publications of the Astronomical Society of Australia, 1983
The temporal behaviour of Rayleigh-Benard convection has attracted considerable attention in recent years, both from an experimental and theoretical point of view. Experiments (eg. Gollub and Benson 1980) have demonstrated a complicated array of non-linear behaviour, as well as the need for a model which will at least qualitatively describe what is ...
J. M. Lopez, J. O. Murphy
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Time constants in thermal laser medicine

Lasers in Surgery and Medicine, 1989
AbstractTemperature rise of laser‐irradiated tissue due to direct absorption of laser light is related to laser parameters (power, spot size, irradiation time, and repetition rate) and tissue parameters (absorption and scattering coefficients, density, heat capacity, and thermal conductivity).
M J, van Gemert, A J, Welch
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Stator thermal model for short-time thermal transients

2014 International Conference on Electrical Machines (ICEM), 2014
This paper presents a thermal model for the simulation of the stator winding temperature in short-time thermal transient. A practical application of the model is the overload thermal limit prediction in electrical drives. The proposed thermal model and its evolution is presented in detail in the paper; the thermal parameters computation, based on a ...
BOGLIETTI, Aldo, CARPANETO, Enrico, COSSALE, MARCO, Borlera, Alex Lucco   +3 more
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Thermal time response of microfilaments

2000 IEEE/LEOS International Conference on Optical MEMS (Cat. No.00EX399), 2002
The thermal time response of polysilicon microfilaments has been characterized at high and room temperatures. We have found cool down time constants that are several times lower at room temperature than for equivalent filaments at high temperatures. It is proposed that the cool down transient can be directly controlled by "substrate quenching," where ...
R.N. Supino, J.J. Talghader
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Semiconductor-laser thermal time constant

Journal of Applied Physics, 1986
Thermal time constants of semiconductor lasers (‘‘test lasers’’) are measured by transient heating of test laser chips by use of another laser (‘‘pump laser’’). Pump laser emission impinging on the test laser p contact generates local heating. Thus, current-independent thermal responses are studied.
R. D. Esman, D. L. Rode
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Thermal Analysis of Timing Belt

SAE Technical Paper Series, 1989
<div class="htmlview paragraph">This paper describes an analysis of the rise in timing belt temperature occuring under high engine speed operation that was made to establish the cause of heat deterioration of the belt materials.</div> <div class="htmlview paragraph">Surface temperatures of the belt were accurately measured by ...
Shizuo Abe, Masayoshi Tokoro, Takehisa Yaegashi, Kazuyoshi Ogawa   +3 more
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Time evolution of thermal instabilities

The Physics of Fluids, 1977
The steady-state temperature profiles in a magnetically confined cylindrical plasma obtained by balancing Ohmic power input and thermal diffusion are shown to exhibit a bifurcation as a function of the applied electric field. A linear stability analysis predicts that the upper (high temperature) branch is unstable and that the lower branch is stable ...
D. Dobrott, R. L. Miller, John M. Rawls
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Thermal converter time constant and response time

Electrical Engineering, 1958
THE DYNAMIC CHARACTERISTICS of a thermal converter∗ for measuring alternating current or voltage are of some importance in a number of applications. Of these, the time constant and response time are the characteristics most often required. The change of emf of a thermal converter after a step change in heater current is only approximately exponential ...
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