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  • 1
    Electronic Resource
    Electronic Resource
    An Evaluation on H/V Ratio vs. Spectral Ratio for Site-response Estimation Using the 1994 Northridge Earthquake Sequences (1999)
    Springer
    Pure and applied geophysics 156 (1999), S. 631-649 
    Details
    ISSN: 1420-9136
    Keywords: Key Words: H/V ratio, spectral ratio, site response, microtremor, resonant frequency, amplification.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract —The applicability of the single-station H/V method, based on the spectral ratio between the horizontal and the vertical components of strong ground motions, is examined for site-response estimation using the high quality data from the 1994 Northridge earthquake sequence. Instead of using Rayleigh-wave data from microtremors, the large amplitude-wave part of the S-wave data is used and based on the 1994 Northridge mainshock and aftershock recordings. We have found that upon averaging over a number of recordings for a given station, the station site responses, derived both from the single-station H/V ratio and from the standard spectral ratio (with respect to a reference rock-site station) are sufficiently close for practical purposes. We therefore conclude that the H/V ratio can reasonably predict the resonant frequency and the amplification level of a site response, especially for sites in the neighborhood of the epicenters. In the absence of a reference rock-site station, the H/V ratio provides a practical alternative to the standard site-response estimation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000240050316
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  • 2
    Electronic Resource
    Electronic Resource
    Variations of radon content in groundwaters and possible correlation with seismic activities in northern Taiwan (1984)
    Springer
    Pure and applied geophysics 122 (1984), S. 231-244 
    Details
    ISSN: 1420-9136
    Keywords: Radon ; Groundwater ; Earthquakes ; Taiwan
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Radon (222Rn) concentration in geothermal waters and CO2-rich cold springwaters collected weekly in duplicate samples from four stations in northern Taiwan were measured from July 1980 to December 1983. Seven spike-like radon anomalies (increases of 2 to 3 times the standard deviation above the mean) were observed at three stations. Following every anomaly except one, an earthquake ofM L above 4.6 occurred within 4 to 51 days, at an epicentral distance 14 to 45 km, and at a focal depth of less than 10 km. The distribution of the earthquakes preceded by radon anomalies is skewed in certain directions from the radon stations; the radon stations seem to be insensitive to earthquakes occurring in the other directions. At the fourth station, near a volcanic area, much gas (mainly CO2) is discharged from the well, together with hot water. A very high concentration of radon was detected in the discharged gas; therefore trapping of gas in the water can result in anomalously high radon contents. According to limited measurements, the radon concentration in water appears to be undersaturated with respect to that in gas. This suggests that hot water is very susceptible to radon loss, and monitoring of radon in gas is more desirable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00874596
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  • 3
    Electronic Resource
    Electronic Resource
    Temporal variation of codaQ during Hualien earthquake of 1986 in eastern Taiwan (1989)
    Springer
    Pure and applied geophysics 130 (1989), S. 617-634 
    Details
    ISSN: 1420-9136
    Keywords: CodaQ ; envelope decay curve ; temporal variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The May 20, 1986, Hualien earthquake sequence occurred on the northeastern coast of Taiwan. TheM=6.1 (GS mb) mainshock was followed by a large number of closely-clustered aftershocks with the largest being anM=5.5 event. One seismic station, TWD of the Taiwan Telemetered Seismographic Network, is located in the surface projection of the source region and provides excellent recordings of the entire earthquake sequence. These recordings, plus events occurring in the same source area preceding the mainshock, offer a unique opportunity to study the spatial and temporal variations of codaQ in a region of active subduction. A simple technique is devised that uses the envelope of the coda waveform to enable a quick determination of the codaQ from drum records. For recordings with a peak power at about 8 Hz, the following findings have been obtained: 1. The ambient codaQ near an active subduction region was as low as 145; 2. There was no significant decrease in codaQ within the period beginning one year and four months prior to the mainshock; 3. There was a significant drop of codaQ immediately after the mainshock; this drop lasted approximately two days before returning to the ambient level; 4. CodaQ values varied with focal depth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00881601
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  • 4
    Electronic Resource
    Electronic Resource
    Composition and molecular weights of butyrylcholinesterase from horse serum
    Amsterdam : Elsevier
    Archives of Biochemistry and Biophysics 176 (1976), S. 71-81 
    Details
    ISSN: 0003-9861
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0003-9861(76)90142-9
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  • 5
    Electronic Resource
    Electronic Resource
    Nonlinear forced vibration analysis of the rectangular plates by the Fourier series method (1999)
    Springer
    Computational mechanics 23 (1999), S. 1-7 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In this paper the Fourier series method is introduced to obtain the solution for the displacement response of rectangular plates subjected to a blast loading. Applying the Fourier series method, the von Karman nonlinear equations of plates are transformed into Duffing type nonlinear ordinary differential equations and then solved by adopting the Lindstedt-Poincar'e perturbation method. The complete analysis of square plates was carried out for all-clamped edge conditions. The results of deflection history and stress resultants which uses one perturbation term sufficiently correlated with results coming from both related literature as well as the finite element method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004660050380
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    Paper (German National Licenses)
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