scholarly journals Factors controlling landslide frequency–area distributions

2018 ◽  
Vol 44 (4) ◽  
pp. 900-917 ◽  
Author(s):  
Hakan Tanyaş ◽  
Cees J. Westen ◽  
Kate E. Allstadt ◽  
Randall W. Jibson
Keyword(s):  
Landslide Frequency ◽  
Frequency Area

scholarly journals Validating the Operational Bias and Hypothesis of Universal Exponent in Landslide Frequency-Area Distribution

PLoS ONE ◽  
2014 ◽  
Vol 9 (5) ◽  
pp. e98125
Author(s):  
Jr-Chuan Huang ◽  
Tsung-Yu Lee ◽  
Tse-Yang Teng ◽  
Yi-Chin Chen ◽  
Cho-Ying Huang ◽  
...  
Keyword(s):  
Area Distribution ◽  
Landslide Frequency ◽  
Frequency Area

APPLICATION OF UNCONVENTIONAL METHODS FOR FREQUENCY ANALYSIS IN ACOUSTICS

Akustika ◽  
2020 ◽  
Vol 36 (36) ◽  
pp. 25-32
Author(s):  
Jaroslav Smutný ◽  
Dušan Janoštík ◽  
Viktor Nohál
Keyword(s):  
Fourier Transform ◽  
Discrete Fourier Transform ◽  
Frequency Analysis ◽  
Mathematical Analysis ◽  
Measured Data ◽  
Application Area ◽  
Acoustic Response ◽  
Recommendations For Practice ◽  
Unconventional Methods ◽  
Frequency Area

The goal of this study is to familiarize a wider professional public with not fully known procedures suitable for processing measured data in the frequency area. Described is the use of the so-called Multi-taper method to analyze the acoustic response. This transformation belongs to a group of nonparametric methods outgoing from discrete Fourier transform, and this study includes its mathematical analysis and description. In addition, the use of respective method in a specific application area and recommendations for practice are described.

The Study of Method for Calculating Geometric Average Sound Intensity in Scattering Field

2010 ◽  
Vol 458 ◽  
pp. 185-191
Author(s):  
Feng Li Luo ◽  
Guang Yu Li
Keyword(s):  
High Frequency ◽  
Sound Pressure ◽  
Computing Time ◽  
Sound Intensity ◽  
Frequency Range ◽  
Average Value ◽  
Geometric Average ◽  
Scattering Field ◽  
Measurement Efficiency ◽  
Frequency Area

When calculating sound intensity by indirectly measuring way, the sound pressures obtained from two microphones should be mathematically averaged as the sound pressure of measured point. The research showed that the method exists lower of allowable value in the high frequency area. Using the geometric average value of two measured points to replace the sound pressure of measured point, studying the measurement of sound intensity in scattering field, the errors from which were compared. The result showed that the error of geometric average sound intensity was more flat than that of mathematic average. So the sound intensity obtained from geometric average sound pressure is more suitable for the measurement of a wider frequency range. And the computing time is short, which can raise the measurement efficiency and the real-time of measurement.

scholarly journals Cochlear Dysfunction after Kanamycin Injection in Multidrug Resistant Tuberculosis Patients

2021 ◽  
Vol 56 (3) ◽  
pp. 216
Author(s):  
Aditya Brahmono ◽  
Nyilo Purnami ◽  
Bakti Surarso
Keyword(s):  
Hair Cells ◽  
Multidrug Resistant ◽  
Distortion Product Otoacoustic Emission ◽  
Resistant Tuberculosis ◽  
Multidrug Resistant Tuberculosis ◽  
Significant Difference ◽  
Mdr Tb ◽  
Specific Frequency ◽  
Frequency Area ◽  
Cochlear Dysfunction

Background: Longterm exposure to aminoglycoside such as kanamycin to cochlear cells is known to be associated with damage to outer hair cells in the organ Cortiand type 1 sensory hair cells in the vestibular organs which ultimately causes permanent damage to hair cells. Hair cell damage occurs from the basal cochlea (high frequency area) to the apex cochlea (low frequency area) and followed by damage from the auditory nerve. Evaluation of cochlear dysfunction on multidrug resistant tuberculosis (MDR TB) patients have been rarelyreported in the literature based on distortion product otoacoustic emission (DPOAE).Objectives: To prove cochlear dysfunction after kanamycin injection in MDR TB patient based on DPOAE examination of the overall frequencies and specific frequency.Methods: An observational longitudinal analytic with pre and post design without control group conducted in the infection division of MDR TB Outpatients Pulmonology Department and Otorhinolaryngology Community division of ORL-HNS Department Dr. Soetomo general hospital Surabaya, within 3 months in 2018, 15 ear with the best baseline examination were taken by consecutive sampling and statistical analysis for cochlear dysfunction based on overall  frequency and specific frequency DPOAE examination using Mc Nemar test.Results: Based on DPOAE examination of overall frequencies there was no cochlear dysfunction (p > 0.05) but a significant difference was found at frequency of 10,000 Hertz (Hz) (p = 0.002 ).Conclusion:On ototoxicity monitoring there was no cochlear dysfunction after 4 weeks  Kanamycin injection but cochlear dysfunction occurs at a specific frequency of 10,000 Hz.

scholarly journals Track Dynamic Response At Low Frequencies – Dominant Frequencies

2015 ◽  
Vol 15 (2) ◽  
Author(s):  
Milan Moravčík ◽  
Martin Moravčík
Keyword(s):  
Dynamic Response ◽  
Moving Load ◽  
Low Frequency ◽  
Track Structure ◽  
Dynamic Effects ◽  
Low Frequencies ◽  
Frequency Area ◽  
Dominant Frequencies ◽  
40 Hz

Abstract The paper is devoted dynamic effects in the track structure - the quasi-static excitation due to moving load, as the important source for the response of track components in the low frequency area (0 Hz < f < 40 Hz). The low-frequency track (the rail) response is associated with periodicity of wheel sets, bogies, and carriages of passage trains, The periodicity of track loading is determined by so called dominant frequencies f(d) at a position x of the track.

scholarly journals How size and trigger matter: analyzing rainfall- and earthquake-triggered landslide inventories and their causal relation in the Koshi River basin, Central Himalaya

2018 ◽  
Author(s):  
Jianqiang Zhang ◽  
Cees J. van Westen ◽  
Hakan Tanyas ◽  
Olga Mavrouli ◽  
Yonggang Ge ◽  
...  
Keyword(s):  
River Basin ◽  
Causal Relation ◽  
Anthropogenic Activities ◽  
Slope Angle ◽  
Central Himalaya ◽  
Triggering Mechanism ◽  
Susceptibility Maps ◽  
Triggering Mechanisms ◽  
Koshi River Basin ◽  
Frequency Area

Abstract. Inventories of landslides caused by different triggering mechanisms, such as earthquakes, extreme rainfall events or anthropogenic activities, may show different characteristics in terms of distribution, causal factors and frequency-area relationships. This research aims to study such differences in landslide inventories, and the effect they have on landslide susceptibility assessment. Koshi River basin in central Himalaya was taken as study area. Detailed landslide inventories were generated based on visual interpretation of remote sensing images and field investigation for different time periods and triggering mechanisms. Maps and images from the period 1992 to 2015 were used to map 5,858 rainfall-triggered landslides and after the 2015 April 25 Gorkha earthquake, an additional 1138 co-seismic landslides were mapped. A set of topographic, geological and land cover factors were employed to analyze their correlation with different types and sizes of landslides. The results show that the frequency – area distributions of rainfall and earthquake–triggered landslides varied considerably, with the former one having a larger frequency of small landslides. Also topographic factors varied considerably for the two triggering events, with both elevation and slope angle showing significantly different patterns for earthquake-triggered and rainfall-triggered landslides. Landslides were classified into two size groups, in combination with the main triggering mechanism (rainfall- or earthquake-triggered). Susceptibility maps for different combinations of landslide size and triggering mechanism were generated using logistic regression analysis. The different triggers and sizes of landslide data were used to validate the models. The results showed that susceptible areas for small and large size rainfall- and earthquake-triggered landslides differed substantially, while susceptibility maps for different size of earthquake-triggered landslides were similar.

scholarly journals Dielectric Properties of Substrates for InkJet Technology in GHz Area

2019 ◽  
Vol 63 (1) ◽  
pp. 9-15
Author(s):  
Tibor Rovensky ◽  
Peter Lukacs ◽  
Alena Pietrikova
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Inkjet Printing ◽  
Measuring Method ◽  
Flexible Substrates ◽  
Network Analyzer ◽  
Dielectric Constant And Loss ◽  
Inkjet Printing Technology ◽  
Specific Material ◽  
Frequency Area

This paper is focused on investigation of dielectric properties of various substrates for InkJet printing technology. In addition this paper included investigation of dielectric properties' homogeneity. Dielectric constant and loss tangent of polymeric flexible substrates (Polyimide DuPont Kapton HN, PET Mylar A, PEN Teonex Q51) and insulation paper (Nomex 410) were measured in GHz frequency area. Measurements were done by combination of vector network analyzer and split cylinder resonator. This measuring method provides dielectric properties at frequency around 10 GHz, the exact value of frequency may vary depends on specific material and its resonant frequency. Experiments included two types of samples, 6 x 6 cm which is recommended area for measurements of dielectric properties by split cylinder resonator and 12 x 12 cm for measurements of dielectric properties' homogeneity (one sheet contains 9 overlapping measuring areas 6 x 6 cm). All measured values of dielectric constant and dielectric losses were statistically processed and depicted by SigmaPlot software. The paper shows values of dielectric properties at GHz frequency area as they are lacking in datasheets from manufacturers and evaluate homogeneity of measured substrates.

Road Location and Construction Practices: Effects on Landslide Frequency and Size in the Oregon Coast Range

1987 ◽  
Vol 2 (4) ◽  
pp. 119-124 ◽  
Author(s):  
John Sessions ◽  
John C. Balcom ◽  
Kevin Boston
Keyword(s):  
Marginal Cost ◽  
Risk Group ◽  
Coast Range ◽  
Oregon Coast Range ◽  
Oregon Coast ◽  
Group I ◽  
Landslide Frequency ◽  
Group Ii

Abstract The effects of road location and construction practices on landslide frequency and size were studied in a 300,000-ac area of the Oregon Coast Range. Roads were divided into two groups. Roads in Group I had been built using a combination of steep road grades and full-bench, endhaul construction to minimize slide risk. Group II roads were built using location and construction practices typical of the late 1960s and early 1970s. Using steep road grades to maintain ridgetop locations and full-bench end-haul construction did reduce landslide frequency and size on Group I, as compared to Group II, roads. The marginal cost of reducing slide volumes/road-mile from the volumes found on Group II roads to the volumes found on Group I roads was six times greater in more plastic than in less plastic soils when roads crossed slopes of equal steepness. When roads crossed slopes with a sideslope steeper than 50%, the estimated cost of reducing the volume/road-mile of slide from Group II to Group I levels ranged from $81/yd³ ($154/ac) to over $12,000/yd³ ($3675/ac), depending on landtype, sideslope, and endhaul distance. West. J. Appl. For. 2(4):119-124, October 1987.

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