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... EMG is a signal that must be recorded, so there are several electronic acquisition platforms (Arduino, PowerLab from ADInstruments Ltd, Data Acquisition card "DAQ" from National Instruments, etc.). We have chosen as an acquisition platform the Arduino mega card for its availability (see figure 01). This card must be connected through electrodes on the surface of the skin because the EMG is a non-invasive examination ( Figure 2). ...
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We present two practical and widely applicable methods, including some criteria and a general procedure, for detecting Brunnian property of a link, if each component is known to be unknot. The methods are based on observation and handwork. They are used successfully for all Brunnian links known so far. Typical examples and extensive experiments ill...
Citations
... Wavelet coherency has been used for understanding scalespecific and localized relationships for transient processes in various areas, including geoscience (Zhang et al. 2017), electrical engineering (Rezki et al. 2017), health science (Adam et al. 2018), soil science (Biswas 2018), and meteorology (Torrence and Compo 1998). However, this method is limited to using only two variables, and natural processes are rarely simplistic but are generally influenced by more than two environmental factors. ...
Knowledge on multi-scale and localized control of saturated soil hydraulic conductivity (Ksat) at the watershed scale is lacking. The objective of this study was to evaluate the multi-scale spatial relationships among Ksat and environmental factors (i.e., soil and topographic attributes and land-use systems) using wavelet coherency and multiple wavelet coherence methods. In the Fragata River Watershed (FRW) in southern Brazil, one hundred points were distributed at equal distances along a 15-km transect. In the 0–20 cm layer, clay and sand fractions, organic carbon content, bulk density, macroporosity, Ksat, and soil water retention curve were determined from soil sampled at each point. The digital elevation model was used for obtaining topographic attributes. A land-use map was developed by use of satellite images. All data sets were analyzed using descriptive statistics, and the relationship among Ksat and the other variables was evaluated through the Spearman correlation coefficient. Wavelet coherency and multiple wavelet coherence were used to examine the correlation among Ksat and each of the explanatory variables and to investigate the scale-specific and localized multivariate relationships among Ksat and predictor variables, respectively. According to the bivariate wavelet coherency and multiple wavelet coherence analyses, macroporosity showed the greatest mean wavelet coherence and percent area of significance coherence with Ksat. The variations of soil macroporosity itself were enough to explain the variations in Ksat in a multiple-scale and -location domain. Soil macroporosity could be used as a proxy for assessing runoff potential at different land-use systems with different scales in the FRW in southern Brazil.
