Physical demands associated with right-angle direct-current power-tools: An evaluation of current technology

2021 ◽  
Vol 93 ◽  
pp. 103374
Author(s):  
C. Steingraber ◽  
D. Devries ◽  
L. Eaton ◽  
M. Smets ◽  
A. Stephens ◽  
...  
Keyword(s):  
Direct Current ◽  
Physical Demands ◽  
Current Technology ◽  
Power Tools

A comparison of the physical demands associated with various right-angle direct-current power tools

2021 ◽  
Vol 96 ◽  
pp. 103488
Author(s):  
J. Cort ◽  
L. Eaton ◽  
M. Smets ◽  
A. Stephens ◽  
G. Malone ◽  
...  
Keyword(s):  
Direct Current ◽  
Physical Demands ◽  
Power Tools

Enhanced Stabilization of Dikes and Levees Using Direct Current Technology

2008 ◽  
Author(s):  
J. Kenneth Wittle ◽  
Lawrence M. Zanko ◽  
Falk Doering ◽  
James Harrison
Keyword(s):  
Direct Current ◽  
Current Technology

scholarly journals A comparative study of a direct current heating system and a gas furnace heating coil

2019 ◽  
pp. 185-194
Author(s):  
Ali Taileb
Keyword(s):  
Direct Current ◽  
Energy Savings ◽  
Current System ◽  
Heating System ◽  
Heating Element ◽  
Electrical Heating ◽  
Test Bed ◽  
Heating Coil ◽  
Current Technology ◽  
Furnace Heating

The objective of this research is to compare the efficiency of a direct current (DC) heating system with an electrical furnace coil. This was done using a house lab as a test bed located on the Durham College Whitby Campus in Canada. The house is approximately 1000 square feet, originally built circa 1950's/1960's, with an existing gas furnace of 60,000 BTUs and an energy efficiency EnerGuide rating of 95.5. Three options were tested during winter 2016 along with the electrical heating element. Weather normalization was taken into consideration using data provided by the weather network. The analysis showed that the direct current heating system option 3 had a higher BTUH/Watt= 3.73 compared to the furnace heating element=2.25 BTUH/Watt which represent a difference of 39.6%. An energy simulation was run using the HOT2000 software to evaluate the direct current technology vs gas, oil, propane and electricity. In each case the direct current technology showed an energy savings better than the comparative technology. From the data collected and analysis, it can be concluded that the direct current system is a valid technology for heating buildings. It is more efficient than the industry standard electrical heating coil with an efficiency of up to 40% better.

FM Verification for the 21 st Century

2008 ◽  
Vol 18 (1) ◽  
pp. 4-9 ◽  
Author(s):  
Leisha Eiten ◽  
Dawna Lewis
Keyword(s):  
Hearing Loss ◽  
Hearing Aids ◽  
Hearing Aid ◽  
Current Technology ◽  
The Past ◽  
Technological Advances ◽  
Children With Hearing Loss

Background: For children with hearing loss, the benefits of FM systems in overcoming deleterious effects of noise, distance, and reverberation have led to recommendations for use beyond classroom settings. It is important that audiologists who recommend and fit these devices understand the rationale and procedures underlying fitting and verification. Objectives: This article reviews previousguidelines for FM verification, addresses technological advances, and introduces verification procedures appropriate for current FM and hearing-aid technology. Methods: Previous guidelines for verification of FM systems are reviewed. Those recommendations that are appropriate for current technology are addressed, as are procedures that are no longer adequate for hearing aids and FM systems utilizing more complex processing than in the past. Technological advances are discussed, and an updated approach to FM verification is proposed. Conclusions: Approaches to verification andfitting of FM systems must keep pace with advances in hearing-aid and FM technology. The transparency approach addressed in this paper is recommended for verification of FM systems coupled to hearing aids.

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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