Results 11 - 20 of 485

Measurement and Modeling of Damping for Time-Domain Stru tral A ousti s Simulations

by Benjamin Cotté, Augustin Parret-fréaud, Antoine Chaigne
"... benjamin. otteensta-pariste h.fr This work deals with the measurement and time-domain modeling of damping in structural acoustics. An experimental technique based on the plate impulse response measurement is presented to estimate the damp-ing factor over a wide frequency band. This technique is succ ..."
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benjamin. otteensta-pariste h.fr This work deals with the measurement and time-domain modeling of damping in structural acoustics. An experimental technique based on the plate impulse response measurement is presented to estimate the damp-ing factor over a wide frequency band. This technique

The real-valued time-domain TE-modes in lossy waveguides

by O. A. Tretyakov, M. Kaya - Progress In Electromagnetics Research
"... Abstract—The time-domain studies of the modal fields in a lossy waveguide are executed. The waveguide has a perfectly conducting surface. Its cross section domain is bounded by a singly-connected contour of rather arbitrary but enough smooth form. Possible waveguide losses are modeled by a conductiv ..."
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Abstract—The time-domain studies of the modal fields in a lossy waveguide are executed. The waveguide has a perfectly conducting surface. Its cross section domain is bounded by a singly-connected contour of rather arbitrary but enough smooth form. Possible waveguide losses are modeled by a

FREQUENCY AND TIME DOMAIN DYNAMIC ANALYSIS CONVERGENCE AND CAUSALITY

by F Venancio Filho , F S Barbosa , A M Claret , F Venancio Filho , F S Barbosa , A M Claret
"... Abstract: The relation of frequency and time domain (FD and TD) methods of dynamic structural analysis is presented in this paper. In the FD the analysis is performed through a matrix formulation which leads to the Implicit Fourier Transform (ImFT) concept. By this concept the direct and inverse Fo ..."
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Abstract: The relation of frequency and time domain (FD and TD) methods of dynamic structural analysis is presented in this paper. In the FD the analysis is performed through a matrix formulation which leads to the Implicit Fourier Transform (ImFT) concept. By this concept the direct and inverse

Cognitive perspectives of information retrieval interaction: elements of a cognitive IR theory

by Peter Ingwersen - Journal of Documentation , 1996
"... The objective of the paper is to amalgamate theories of text retrieval from various research traditions into a cognitive theory for information retrieval interaction. Set in a cognitive framework, the paper outlines the concept of polyrepresentation applied to both the user's cognitive space an ..."
Abstract - Cited by 188 (11 self) - Add to MetaCart
and the information space of IR systems. The concept seeks to represent the current user's information need, problem state, and domain work task or interest in a structure of causality. Further, it implies that we should apply different methods of representation and a variety of IR techniques of different

Time-Domain Measurement of Negative Group Delay in Negative-Refractive-Index Transmission-line Metamaterials

by Omar F. Siddiqui, Suzanne J. Erickson, George V. Eleftheriades, Mohammad Mojahedi , 2004
"... We have simulated and constructed a one-dimensional metamaterial composed of a periodically loaded transmission line that exhibits both negative and positive group velocities in a band of effective negative index of refraction. The negative group velocity or, equivalently, the negative group delay, ..."
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that this surprising behavior does not violate the requirements of relativistic causality is illustrated with time-domain simulations, which show that discontinuities in the pulse waveforms are traveling at exactly the speed of light in vacuum. The pulse-reshaping mechanism underlying this behavior is also illustrated

Visualizing Causality

by Eric Davies University, Eric J. Davies, William B. Cowan - The International Economics Analyst (Goldman Sachs , 1996
"... this paper discusses how we have given these properties to TNV# and how we have applied the visualizer to two di#erent application domains that are time oriented# local area network tra#c and economic modeling. We conclude with preliminary results of our user testing ..."
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this paper discusses how we have given these properties to TNV# and how we have applied the visualizer to two di#erent application domains that are time oriented# local area network tra#c and economic modeling. We conclude with preliminary results of our user testing

A SYNTHESIS METHOD FOR TIME-DOMAIN PASSIVE FILTERS COMPENSATING FOR WAVEFORM DISTOR- TION

by U. Sangawa
"... Abstract—A novel synthesis method for a class of time-domain passive filters that compensates for waveform distortion caused by frequency dependencies of the transmission properties of signal propagation paths, is formulated. The method is based on the linear response theory and mathematical propert ..."
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Abstract—A novel synthesis method for a class of time-domain passive filters that compensates for waveform distortion caused by frequency dependencies of the transmission properties of signal propagation paths, is formulated. The method is based on the linear response theory and mathematical

Scalable Power Grid Transient Analysis via MOR-Assisted Time-Domain Simulations

by Jia Wang, Xuanxing Xiong
"... Abstract—Time domain power grid simulations provide accurate estimations of power supply noises for design verifications. Despite extensive researches, it remains a very challenging problem to perform the simulations efficiently – the large power grid sizes demand tremendous computational resources ..."
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and the causality between consecutive time steps hinders parallel implementations. Frequency domain and model order reduction (MOR) techniques promise scalability, though the solution accuracy may become a concern without trading off running time. In this paper, we present a framework for power grid transient

Efficient Evaluation of Near-Field Time-Domain Physical-Optics Integral Using Locally Expanded Green Function Approximation

by Xiao Zhou , Tie Jun Cui , 2015
"... Abstract-A time-efficient method is proposed to calculate the near-field time-domain physical-optics (TD-PO) integral to analyze the transient electromagnetic fields scattered from three-dimensional perfectly conducting objects under the illumination of a pulsed plane wave. It is shown that the TD- ..."
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Abstract-A time-efficient method is proposed to calculate the near-field time-domain physical-optics (TD-PO) integral to analyze the transient electromagnetic fields scattered from three-dimensional perfectly conducting objects under the illumination of a pulsed plane wave. It is shown that the TD

Self-determination and persistence in a real-life setting: Toward a motivational model of high school dropout.

by Robert J Vallerand , Michelle S Fbrtier , Frederic Guay - Journal of Personality and Social Psychology, , 1997
"... The purpose of this study was to propose and test a motivational model of high school dropout. The model posits that teachers, parents, and the school administration's behaviors toward students influence students' perceptions of competence and autonomy. The less autonomy supportive the so ..."
Abstract - Cited by 183 (19 self) - Add to MetaCart
schools. Questionnaire The questionnaire was made up of five parts. In the first part, participants completed three scales that assessed perceptions of different social agents' (parents, teachers, and the school administration) autonomy support in the school domain. 1 Each scale consisted of three
Results 11 - 20 of 485