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61948 documents, page 1 of 6195

Comments on “Bedrock Intensity Attenuation and Site Factors from San Fernando Earthquake Records” by K. W. Campbell and C. Martin Duke

Jennings, Paul C. (1974)
In the paper "Bedrock Intensity Attenuation and Site Factors from San Fernando Earthquake Records," by K. W. Campbell and C. Martin Duke, which appeared in the February, 1974 issue of the Bulletin, a correlation is made between a measure of intensity of recorded ground accelerations and four categories of soil, classified by increasing softness. The authors present different numerical site factors for each category and conclude that their results are sufficiently reliable to ju...

Filtering in nonlinear time delay systems

Yu, Thomas K.; Seinfeld, John H.; Ray, W. Harmon (1974)
Linear and nonlinear (extended Kalman-Bucy) filters are derived for systems governed by coupled partial and integro-differential equations. The framework used is sufficiently general that filters for 1) lumped parameter systems having multiple time varying or constant time delays, 2) coupled lumped and hyperbolic distributed parameter systems, and 3) lumped parameter systems with functional time delays, evolve as special cases. Although the filtering equations are the final result, the corres...

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