A Modified Sine Wave Method for Calculating Degree Days 1

1976 ◽  
Vol 5 (3) ◽  
pp. 388-396 ◽  
Author(s):  
Jon C. Allen
Keyword(s):  
Sine Wave ◽  
Wave Method ◽  
Degree Days

Survey of the reproductive development of field-caught Halyomorpha halys (Hemiptera: Pentatomidae) in the Niagara Region of Ontario, Canada

2019 ◽  
Vol 151 (3) ◽  
pp. 406-409
Author(s):  
Andrew J. Frewin ◽  
Kevin Scaife ◽  
Hannah Fraser ◽  
Cynthia D. Scott-Dupree
Keyword(s):  
Insect Pests ◽  
Reproductive Development ◽  
Sine Wave ◽  
Halyomorpha Halys ◽  
Brown Marmorated Stink Bug ◽  
Stink Bug ◽  
Degree Days ◽  
Adult Females ◽  
Two Generations ◽  
History Of

AbstractHalyomorpha halys (Stål) (Hemiptera: Pentatomidae), also known as the brown marmorated stink bug, is an invasive agricultural and nuisance pest. Knowledge of the life history of insect pests is important for informing pest management activities. Some North American populations of H. halys have two generations per year, and it is suspected that H. halys may have a partial second generation in the Niagara Region of Ontario, Canada. We determined the number of H. halys generations in Ontario by examining the reproductive development of field-caught adult females. The pattern of reproductive development we observed supports the conclusion that H. halys complete one generation per year in the Niagara Region of Ontario. Reproductively active H. halys were captured as early as May and continued until early September, and the peak of reproductively active individuals occurred between 250 and 550 degree days calculated with a sine-wave function and a lower threshold set to 14.17 °C.

A Simple Method for Measuring Stiffness during Running

2005 ◽  
Vol 21 (2) ◽  
pp. 167-180 ◽  
Author(s):  
Jean-Benoît Morin ◽  
Georges Dalleau ◽  
Heikki Kyröläinen ◽  
Thibault Jeannin ◽  
Alain Belli
Keyword(s):  
High Speed ◽  
Sine Wave ◽  
Force Platform ◽  
Mechanical Parameters ◽  
Wave Method ◽  
Leg Length ◽  
Mass Model ◽  
Time Curve ◽  
Simple Method ◽  
Vertical Stiffness

The spring-mass model, representing a runner as a point mass supported by a single linear leg spring, has been a widely used concept in studies on running and bouncing mechanics. However, the measurement of leg and vertical stiffness has previously required force platforms and high-speed kinematic measurement systems that are costly and difficult to handle in field conditions. We propose a new “sine-wave” method for measuring stiffness during running. Based on the modeling of the force-time curve by a sine function, this method allows leg and vertical stiffness to be estimated from just a few simple mechanical parameters: body mass, forward velocity, leg length, flight time, and contact time. We compared this method to force-platform-derived stiffness measurements for treadmill dynamometer and overground running conditions, at velocities ranging from 3.33 m·s–1to maximal running velocity in both recreational and highly trained runners. Stiffness values calculated with the proposed method ranged from 0.67% to 6.93% less than the force platform method, and thus were judged to be acceptable. Furthermore, significant linear regressions (p< 0.01) close to the identity line were obtained between force platform and sine-wave model values of stiffness. Given the limits inherent in the use of the spring-mass model, it was concluded that this sine-wave method allows leg and stiffness estimates in running on the basis of a few mechanical parameters, and could be useful in further field measurements.

scholarly journals RESEARCH OF RELATION OF SAMPLERS FREQUENCY CHARACTERISTICS / STROBAVIMO ĮTAISO DAŽNINIŲ CHARAKTERISTIKŲ SĄRYŠIO TYRIMAS

2016 ◽  
Vol 8 (3) ◽  
pp. 282-288 ◽  
Author(s):  
Tomaš Tankeliun
Keyword(s):  
Sine Wave ◽  
Frequency Characteristics ◽  
Time Base ◽  
Wave Method ◽  
Magnitude Response ◽  
Wave Measurement ◽  
Measurement Algorithm ◽  
Width Measurements ◽  
Minimal Phase ◽  
Sync Pulse

This paper proposes an algorithm to reduce limitations in band-width measurements of sampling oscilloscopes then using a swept sine-wave measurement method. The traditional swept sine-wave method allow measure only magnitude response. Phase response can be computed only if a sampler is a minimal phase circuit. In this paper alternative bandwidth measurement algorithm using the nose-to-nose method with measurements corrections for the non-idle properties of oscilloscope is de-scribed. Algorithm includes for noise, time base distortions and jitter in measurement signals corrections methods. Proposed algorithm allows to measure phase and magnitude responses when only two similar oscilloscopes and the source of sync pulse are used. Algorithm performs as well as the swept sine-wave method in case when both samplers have the same frequency characteristics. Stroboskopiniai osciloskopai skirti matuoti sparčius periodinius signalus naudojant sąlyginai nesparčius didelio skiltiškumo analoginius-skaitmeninius keitiklius. Vienas iš pagrindinių stroboskopinio osciloskopo mazgų, užtikrinančių, kad osciloskopo charakteristikos atitiktų metrologinius reikalavimus, ir kuriame vyksta matuojamo aukštadažnio signalo spektro transformacija į žemų dažnių sritį, yra strobavimo įtaisas. Šiame darbe pateikiamas strobavimo įtaiso veikimo principas, nagrinėjami įtaiso dažninių charakteristikų matavimo būdai taikant pastovios amplitudės, kintančio dažnio harmoninio virpesio ir priešpriešiais sujungtų strobavimo grandinių metodus. Gauti rezultatai rodo, kad nagrinėjamas strobavimo įtaisas nepriklauso minimalios fazės grandinių klasei ir apskaičiuoti įtaiso dažninę fazės charakteristiką (DFCh) iš dažninės amplitudės charakteristikos (DACh) neįmanoma, tačiau taikant priešpriešiais sujungtų strobavimo grandinių matavimo metodą galima gauti įtaiso DACh ir DFCh nenaudojant papildomos aukštadažnės matavimo įrangos ir mažinant matavimo proceso trukmę.

Reliability of Leg and Vertical Stiffness During High Speed Treadmill Running

2017 ◽  
Vol 33 (2) ◽  
pp. 160-165 ◽  
Author(s):  
Panagiotis Pappas ◽  
Giorgos Dallas ◽  
Giorgos Paradisis
Keyword(s):  
High Speed ◽  
Intraclass Correlation ◽  
Correlation Coefficients ◽  
Sine Wave ◽  
Treadmill Running ◽  
Repeated Measure ◽  
Wave Method ◽  
Vertical Stiffness ◽  
Measure Analysis ◽  
Repeated Measure Analysis

In research, the accurate and reliable measurement of leg and vertical stiffness could contribute to valid interpretations. The current study aimed at determining the intraparticipant variability (ie, intraday and interday reliabilities) of leg and vertical stiffness, as well as related parameters, during high speed treadmill running, using the “sine-wave” method. Thirty-one males ran on a treadmill at 6.67 m∙s−1, and the contact and flight times were measured. To determine the intraday reliability, three 10-s running bouts with 10-min recovery were performed. In addition, to examine the interday reliability, three 10-s running bouts on 3 separate days with 48-h interbout intervals were performed. The reliability statistics included repeated-measure analysis of variance, average intertrial correlations, intraclass correlation coefficients (ICCs), Cronbach’s α reliability coefficient, and the coefficient of variation (CV%). Both intraday and interday reliabilities were high for leg and vertical stiffness (ICC > 0.939 and CV < 4.3%), as well as related variables (ICC > 0.934 and CV < 3.9%). It was thus inferred that the measurements of leg and vertical stiffness, as well as the related parameters obtained using the “sine-wave” method during treadmill running at 6.67 m∙s−1, were highly reliable, both within and across days.

Effects of sine wave contexts on compensation for coarticulation

2009 ◽  
Author(s):  
Navin Viswanathan ◽  
James S. Magnuson ◽  
Carol A. Fowler
Keyword(s):  
Sine Wave

Evaluation of the accuracy of reconstruction of the electrophysical and geometric parameters of multilayer dielectric coatings by the multi-frequency radio wave method of a slow surface electromagnetic waves

2020 ◽  
pp. 51-58
Author(s):  
Aleksandr I. Kazmin ◽  
Pavel A. Fedjunin
Keyword(s):  
Radio Wave ◽  
Noise Level ◽  
Electromagnetic Waves ◽  
Dielectric Materials ◽  
Geometric Parameters ◽  
Experimental Investigations ◽  
Wave Method ◽  
Dielectric Coatings ◽  
Surface Electromagnetic Waves ◽  
Multilayer Dielectric

One of the most important diagnostic problems multilayer dielectric materials and coatings is the development of methods for quantitative interpretation of the checkout results their electrophysical and geometric parameters. The results of a study of the potential informativeness of the multi-frequency radio wave method of surface electromagnetic waves during reconstruction of the electrophysical and geometric parameters of multilayer dielectric coatings are presented. The simulation model is presented that makes it possible to evaluate of the accuracy of reconstruction of the electrophysical and geometric parameters of multilayer dielectric coatings. The model takes into account the values of the electrophysical and geometric parameters of the coating, the noise level in the measurement data and the measurement bandwidth. The results of simulation and experimental investigations of reconstruction of the structure of relative permittivitties and thicknesses of single-layer and double-layer dielectric coatings with different thicknesses, with different values of the standard deviation (RMS) of the noise level in the measured attenuation coefficients of the surface slow electromagnetic wave are presented. Coatings based on the following materials were investigated: polymethyl methacrylate, F-4D PTFE, RO3010. The accuracy of reconstruction of the electrophysical parameters of the layers decreases with an increase in the number of evaluated parameters and an increase in the noise level. The accuracy of the estimates of the electrophysical parameters of the layers also decreases with a decrease in their relative permittivity and thickness. The results of experimental studies confirm the adequacy of the developed simulation model. The presented model allows for a specific measuring complex that implements the multi-frequency radio wave method of surface electromagnetic waves, to quantify the potential possibilities for the accuracy of reconstruction of the electrophysical and geometric parameters of multilayer dielectric materials and coatings. Experimental investigations and simulation results of a multilayer dielectric coating demonstrated the theoretical capabilities gained relative error permittivity and thickness of the individual layers with relative error not greater than 10 %, with a measurement bandwidth of 1 GHz and RMS of noise level 0,003–0,004.

THE SURFACE WAVE METHOD USED FOR DETECTION OF DANGEROUS FLUIDS CONTAINED IN ISOLATED PLASTIC AND GLASS VESSELS

2016 ◽  
Vol 75 (18) ◽  
pp. 1695-1703 ◽  
Author(s):  
Alexey A. Vertiy ◽  
Yurii Konstantinovich Sirenko ◽  
S. Sautbekov ◽  
As. Sabyrov ◽  
K. Balabekov ◽  
...  
Keyword(s):  
Surface Wave ◽  
Wave Method ◽  
Surface Wave Method
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