Synthesis of High-Frequency Ground Motion Using Information Extracted from Low-Frequency Ground Motion: A Case Study in Kanto Area, Japan

Smart wristbands and watches have become an important accessory to fitness, but their application to healthcare is still in a fledgling state. Their long-term wear facilitates extensive data collection and evolving sensitivity of smart wristbands allows them to read various body vitals. In this paper, we hypothesized the use of heart rate variability (HRV) measurements to drive an algorithm that can pre-empt the onset or worsening of an affliction. Due to its significance during the time of the study, SARS-Cov-2 was taken as the case study, and a hidden Markov model (HMM) was trained over its observed symptoms. The data used for the analysis was the outcome of a study hosted by Welltory. It involved the collection of SAR-Cov-2 symptoms and reading of body vitals using Apple Watch, Fitbit, and Garmin smart bands. The internal states of the HMM were made up of the absence and presence of a consistent decline in standard deviation of NN intervals (SSDN), the root mean square of the successive differences (rMSSD) in R-R intervals, and low frequency (LF), high frequency (HF), and very low frequency (VLF) components of the HRV measurements. The emission probabilities of the trained HMM instance confirmed that the onset or worsening of the symptoms had a higher probability if the HRV components displayed a consistent decline state. The results were further confirmed through the generation of probable hidden states sequences using the Viterbi algorithm. The ability to pre-empt the exigent state of an affliction would not only lower the chances of complications and mortality but may also help in curbing its spread through intelligence-backed decisions.

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Effect of Frequency Content of Earthquake on the Seismic Response of Interconnected Electrical Equipment

CivilEng ◽

10.3390/civileng1030012 ◽

2020 ◽

Vol 1 (3) ◽

pp. 198-215

Author(s):

Kashif Salman ◽

Sung Gook Cho

Keyword(s):

Seismic Response ◽

Natural Frequency ◽

Ground Motion ◽

High Frequency ◽

Seismic Analysis ◽

Response Spectrum ◽

Low Frequency ◽

Stable Operation ◽

Design Spectrum ◽

Standard Design

To ensure the stable operation of safety-related nuclear power plant (NPP) equipment, they are tested by following the seismic qualification procedures. The in-cabinet response spectrum (ICRS) is used to test the mounted components. However, the ICRS varies significantly with the number of uncertainties that include (1) loaded and unloaded condition of the cabinets, (2) the number of connected cabinets (grouping effects), and (3) higher frequency contents in the seismic inputs. This study focuses on the ICRS generation and alteration induced due to the listed uncertainties. A prototype of an electrical cabinet was experimentally examined. Followed by the numerical modeling of the cabinet, the seismic analysis for the group of cabinets was performed using artificial ground motion compatible with the standard design spectrum and the real accelerograms of high and low frequency contents. The seismic response using finite element (FE) analysis manifests (1) natural frequency of loaded cabinets reduced due to the in-cabinet components while for the unloaded cabinets it increased significantly, (2) a consistent reduction in ICRS due to the grouping effect was recorded when excited by the lower-frequency motion, while it was amplified dramatically due to high-frequency pulses. Interconnected cabinets under the low-frequency input motions have a significant reduction of 50% in the ICRS that corresponds to the higher stiffness of the cabinets, while a 100% increase under the high frequency of ground motion was obtained. High frequency of ground motion, usually above 10 Hz, can cause the interconnected cabinets to resonate as the natural frequency of these equipment lies in this range.

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ANALISIS SUSEPTIBILITAS MAGNETIK TANAH LAPISAN ATAS SEBAGAI INDIKATOR BENCANA LONGSOR DI BUKIT SULA KECAMATAN TALAWI KOTA SAWAHLUNTO

Komunikasi Fisika Indonesia ◽

10.31258/jkfi.15.2.112-119 ◽

2018 ◽

Vol 15 (2) ◽

pp. 112

Author(s):

Arif Budiman ◽

Dwi Puryanti ◽

Febri Naldi

Keyword(s):

Magnetic Susceptibility ◽

High Frequency ◽

Low Frequency ◽

Magnetic Minerals ◽

Average Value ◽

Rain Drop ◽

Space Range ◽

Test Result ◽

Scanning Electron

Landslide is a disaster that can harm properties and souls. Losses due to landslide can be minimized if there are known signs of landslide.. In this research, the landslide indicator is known through the analysis of the magnetic susceptibility of topsoil. This research is a case study conducted at Bukit Sula, Talawi District, Sawahlunto City.Soil samples were taken from two locations in Sula Hill, which are vegetated location (location A) and unvegetated location (location B). This research’s samples took with downward vertical of each 100 m was taken with a space range of 5 m, so that is obtained 21 sampling points at each of these locations. Measurement of magnetic susceptibility value using Bartington Magnetic Susceptibility Meter measured at two frequencies, namely low frequency of 0.465 kHz (χLF) and high frequency of 4.65 kHz (χHF). At location A the obtained average value of χLF is 804.05×10-8 m3kg-1while the average value of χHF is 804.25×10-8 m3kg-1. At location B the obtained average value of χLF is 9.85×10-8 m3kg-1, while the average value of χHF is 9.64×10-8 m3kg-1. XRF test result showed that magnetic minerals in samples at both locations a hematit (Fe2O3). Based on the comparison of susceptibility value and concentration of hematite and quartz minerals between sample of location A and location B, it can be said that location B has been eroded. Based on the presence of superparamagnetic grain, the samples taken from location B have finer grains than the samples at location A. Scanning Electron Microscope (SEM) also shows that sample B has finer grains than the sample B. These are because location B is an area without vegetation, causing rain drop directly into the soil and can decrease the level of soil grain attachment. Therefore, location B more likely occurred landslide than location A.

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How useful is eap vocabulary for esp? a corpus based case study

10.26686/wgtn.12560402 ◽

2020 ◽

Author(s):

C Sutarsyah ◽

Paul Nation ◽

G Kennedy

Keyword(s):

High Frequency ◽

Low Frequency ◽

Word List ◽

Academic Vocabulary ◽

Very High Frequency ◽

Academic Texts ◽

The University ◽

General Service ◽

Very High

This study compares the vocabulary of a single Economics text of almost 300,000 running words with the vocabulary of a corpus of similar length made up of a variety of academic texts. It was found that the general academic corpus used a very much larger vocabulary than the more focused Economics text. A small number of words that were closely related to the topic of the text occurred with very high frequency in the Economics text. The general academic corpus had a very large number of low frequency words. Beyond the words in West's General Service List and the University Word List, there was little overlap between the vocabulary of the two corpora. This indicates that as far as vocabulary is concerned, EAP courses that go beyond the high frequency academic vocabulary are of little value for learners with specific purposes. © 1994, Sage Publications. All rights reserved.

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How useful is eap vocabulary for esp? a corpus based case study

10.26686/wgtn.12560402.v1 ◽

2020 ◽

Author(s):

C Sutarsyah ◽

Paul Nation ◽

G Kennedy

Keyword(s):

High Frequency ◽

Low Frequency ◽

Word List ◽

Academic Vocabulary ◽

Very High Frequency ◽

Academic Texts ◽

The University ◽

General Service ◽

Very High

This study compares the vocabulary of a single Economics text of almost 300,000 running words with the vocabulary of a corpus of similar length made up of a variety of academic texts. It was found that the general academic corpus used a very much larger vocabulary than the more focused Economics text. A small number of words that were closely related to the topic of the text occurred with very high frequency in the Economics text. The general academic corpus had a very large number of low frequency words. Beyond the words in West's General Service List and the University Word List, there was little overlap between the vocabulary of the two corpora. This indicates that as far as vocabulary is concerned, EAP courses that go beyond the high frequency academic vocabulary are of little value for learners with specific purposes. © 1994, Sage Publications. All rights reserved.

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TR-PIV in highly pulsatile flow: pulsation frequency and wake dynamics case study

14th International Symposium on Particle Image Velocimetry ◽

10.18409/ispiv.v1i1.147 ◽

2021 ◽

Vol 1 (1) ◽

Author(s):

Ian A. Carr ◽

Michael W. Plesniak

Keyword(s):

Pulsatile Flow ◽

High Frequency ◽

Dynamic Range ◽

Low Frequency ◽

Pulsation Frequency ◽

Time Resolved ◽

Image Velocimetry ◽

Pulsatile Flows ◽

Conceptual Overview

Experimental study of highly pulsatile flows presents a number of challenges, primarily the inherently large dynamic range of velocities. Herein, we use time-resolved particle image velocimetry processed with a technique known as pyramid sum-of-correlation to study highly pulsatile flow around a surface-mounted hemisphere. The frequency of pulsation is varied from low- frequency, quasi-steady pulsation to high frequency pulsation. We present a conceptual overview of the wake regimes observed and compare the flow physics of the high-frequency case to that of a vortex ring produced by a single impulse of fluid.

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Simulation of Broadband Ground Motion by Superposing High-Frequency Empirical Green’s Function Synthetics on Low-Frequency Spectral-Element Synthetics

Geosciences ◽

10.3390/geosciences10090339 ◽

2020 ◽

Vol 10 (9) ◽

pp. 339

Author(s):

Ramses Mourhatch ◽

Swaminathan Krishnan

Keyword(s):

Ground Motion ◽

Green's Function ◽

Seismic Wave ◽

High Frequency ◽

Low Frequency ◽

Spectral Element ◽

Time Shift ◽

Frequency Content ◽

Empirical Green's Function ◽

High Frequency Content

Seismic wave-propagation simulations are limited in their frequency content by two main factors: (1) the resolution of the seismic wave-speed structure of the region in which the seismic waves are propagated through; and (2) the extent of our understanding of the rupture process, mainly on the short length scales. For this reason, high-frequency content in the ground motion must be simulated through other means. Toward this end, we adopt a variant of the classical empirical Green’s function (EGF) approach of summing, with suitable time shift, recorded seismograms from small earthquakes in the past to generate high-frequency seismograms (0.5–5.0 Hz) for engineering applications. We superimpose these seismograms on low-frequency seismograms, computed from kinematic source models using the spectral element method, to produce broadband seismograms. The non-uniform time- shift scheme used in this work alleviates the over-estimation of high-frequency content of the ground motions observed. We validate the methodology by simulating broadband motions from the 1999 Hector Mine and the 2006 Parkfield earthquakes and comparing them against recorded seismograms.

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Towards a constructional account of high and low frequency binominal quantifiers in Spanish

Cognitive Linguistics ◽

10.1515/cog-2012-0013 ◽

2012 ◽

Vol 23 (2) ◽

pp. 421-478 ◽

Cited By ~ 10

Author(s):

Katrien Verveckken,

Keyword(s):

High Frequency ◽

Driving Force ◽

Language Change ◽

Low Frequency ◽

Corpus Analysis ◽

Analogical Thinking ◽

Semantic Clustering ◽

The Individual ◽

Present Case Study

AbstractThis paper aims to provide a clearer understanding of the widely discussed topic of grammaticalization of constructions. One unresolved problem concerns the identification of the relevant constructional level of language change, i.e., either the substantial level of specific occurrences or the schematic level of generalizations. Another issue addressed in many current analyses is the degree of schematicity of analogical forces.The present case study addresses these questions in the context of Spanish binominal quantifiers, basing its claims on synchronic and diachronic corpus analysis. The synchronic layering of uses in Present-Day Spanish—which encompasses quantifying and premodifying uses in addition to literal head uses—will be argued to reflect the outcome of grammaticalization. The synchronic as well as diachronic semantic clustering of binominal quantifiers and the prototype function of high-frequency montón de ‘heap of’ are hypothesized to result from the close interaction between analogical thinking and conceptual persistence. In line with the usage-based approach to language change, the dramatic increase in frequency observed for quantifying montón de will lead me to distinguish several constructional levels of change and to establish a schematic ‘N1 de N2’ pattern linked to quantity as a driving force. The strong collocational preferences characterizing the individual binominal constructions, the systematicity of the premodifying use and the tendency to reinforce conceptual elements of the original head use will be accounted for by considering the quantity assessment of the (schematic) binominal string as just one possible realization of co-extensiveness, in addition to quality assessment.

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Vibration Isolation on Lightweight Floor Structures

Building Acoustics ◽

10.1260/135101002320941431 ◽

2002 ◽

Vol 9 (4) ◽

pp. 257-269 ◽

Cited By ~ 2

Author(s):

P Hammer ◽

J Brunskog

Keyword(s):

High Frequency ◽

Vibration Isolation ◽

Low Frequency ◽

High Mobility ◽

Frequency Range ◽

Two Stage ◽

One Stage ◽

Straight Line ◽

Floor Structure

A theoretical and experimental study of vibration isolation for a source on a lightweight floor structure is presented. The effectiveness of one-stage and two-stage isolator systems is studied. Approximate formulae are presented for both low and high frequency for the receiver, the floor structure. For the mobility, a comparison between approximate formulae, numerical exact results and experimental results are presented. The low frequency asymptote for the approximate mobility is valid up to l/λp ≈ 1/4. The high frequency asymptote is valid from l/λp ≈ 1/2. A straight line can be drawn between these two points for the intermediate range 1/4 < l/λp < 1/2. Finally, a case study is presented. A fan is mounted on a wooden joist floor. The effect of both one and two stage isolation is demonstrated. It is clearly seen that the high mobility situation for the receiver is increased by adding a rigid body to the mount. Hence, in the frequency range of interest, the ‘receiver’ acts more or less as a blocked termination. A two-stage isolator almost completely eliminates the structure borne sound and compared to a one-stage isolator it reduces the sound by 20 dB at the rpm for the fan.

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Strong Motion Simulation of the M8.0 August 15, 2007, Pisco Earthquake; Effect of a Multi-Frequency Rupture Process

Journal of Disaster Research ◽

10.20965/jdr.2013.p0235 ◽

2013 ◽

Vol 8 (2) ◽

pp. 235-242 ◽

Cited By ~ 4

Author(s):

Nelson Pulido ◽

◽

Hernando Tavera ◽

Zenon Aguilar ◽

Shoichi Nakai ◽

...

Keyword(s):

Ground Motion ◽

High Frequency ◽

Strong Ground Motion ◽

Low Frequency ◽

Strong Motion ◽

Source Model ◽

First Episode ◽

Earthquake Effect ◽

Broadband Frequency ◽

Strong Ground

We investigated the broadband frequency (0.05-30 Hz) radiation characteristics of the August 15, 2007, Mw8.0 Pisco, Peru, earthquake by simulating the near-source strong ground motion recordings in Parcona city (PCN) and Lima city (NNA). A source model of this earthquake obtained from long-period teleseismic waveforms and InSar data shows two separate asperities, which is consistent with the observation of two distinct episodes of strong shaking in strong motion recordings. We constructed a source model that reproduces near-source records at low frequency (0.05-0.8 Hz) as well as high frequency (0.8-30 Hz) bands. Our results show that the aforementioned teleseismic source model is appropriate for simulating near-source low frequency ground motion. Our modeling of the PCN record in the broad-frequency band indicates that a very strong high frequency radiation event likely occurred near the hypocenter, which generated a large acceleration peak within the first episode of strong shaking at PCN. Using this “broadband frequency” source model we simulated the strong ground motion at Pisco city and obtained accelerations as large as 700 cm/s2and velocities as high as 90 cm/s, respectively, which may explain the heavy damage occurring in the city.

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