scholarly journals Direct-current resistivity profiling at the Pecos River Ecosystem Project study site near Mentone, Texas, 2006

2009 ◽  
Author(s):  
Andrew Teeple ◽  
Alyson K. McDonald ◽  
Jason Payne ◽  
Wade H. Kress
Keyword(s):  
Direct Current ◽  
River Ecosystem ◽  
Project Study ◽  
Pecos River ◽  
Resistivity Profiling

Golden alga presence and abundance are inversely related to salinity in a high-salinity river ecosystem, Pecos River, USA

Harmful Algae ◽  
2014 ◽  
Vol 39 ◽  
pp. 81-91 ◽  
Author(s):  
Natascha M.D. Israël ◽  
Matthew M. VanLandeghem ◽  
Shawn Denny ◽  
John Ingle ◽  
Reynaldo Patiño
Keyword(s):  
High Salinity ◽  
River Ecosystem ◽  
Pecos River

Inter-Method Reliability of Pulse Volume Related Measures Derived Using Finger-Photoplethysmography

2018 ◽  
Vol 32 (4) ◽  
pp. 182-190 ◽  
Author(s):  
Kenta Matsumura ◽  
Koichi Shimizu ◽  
Peter Rolfe ◽  
Masanori Kakimoto ◽  
Takehiro Yamakoshi
Keyword(s):  
Light Intensity ◽  
Adverse Effects ◽  
Light Source ◽  
Direct Current ◽  
Resting State ◽  
Current Component ◽  
Psychophysiological Measures ◽  
Pulse Volume ◽  
Optical Paths ◽  
Sensor Positions

Abstract. Pulse volume (PV) and its related measures, such as modified normalized pulse volume (mNPV), direct-current component (DC), and pulse rate (PR), derived from the finger-photoplethysmogram (FPPG), are useful psychophysiological measures. Although considerable uncertainties exist in finger-photoplethysmography, little is known about the extent of the adverse effects on the measures. In this study, we therefore examined the inter-method reliability of each index across sensor positions and light intensities, which are major disturbance factors of FPPG. From the tips of the index fingers of 12 participants in a resting state, three simultaneous FPPGs having overlapping optical paths were recorded, with their light intensity being changed in three steps. The analysis revealed that the minimum values of three coefficients of Cronbach’s α for ln PV, ln mNPV, ln DC, and PR across positions were .948, .850, .922, and 1.000, respectively, and that those across intensities were .774, .985, .485, and .998, respectively. These findings suggest that ln mNPV and PR can be used for psychophysiological studies irrespective of minor differences in sensor attachment positions and light source intensity, whereas and ln DC can also be used for such studies but under the condition of light intensity being fixed.

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