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Electrical characterization of electro-Ceramics
Published in Amit Sachdeva, Pramod Kumar Singh, Hee Woo Rhee, Composite Materials, 2021
Density measurements are performed employing Archimedes’ principle. The method is based on hydrostatic weighing and it is the best-known density measurement technique [20]. The weight of a specimen is measured in two different media, e.g., air and liquid. To calculate the density of the specimen ρexp, the following equation is used: ρexp=WairρliqWair−Wliq
Activities for Supporting Work Ability of Ageing Workers
Published in Joanna Bugajska, Teresa Makowiec-Dąbrowska, Tomasz Kostka, Individual and Occupational Determinants, 2020
There are other, more accurate body composition measurement techniques, such as hydrostatic weighing or doubly labelled water method (DLW). Imaging techniques are also used for this purpose. These include computed tomography, magnetic resonance imaging and dual-energy X-ray absorptiometry (DXA). Some of the approaches presented above have certain limitations due to the long and complicated measurement techniques, the requirements concerning the patient, a non-portable equipment, high financial cost or significant radiation.
Contamination of Mass Standards
Published in Frank E. Jones, Randall M. Schoonover, Handbook of Mass Measurement, 2002
Frank E. Jones, Randall M. Schoonover
The alacrite standards were cylindrical in shape, with height equal to diameter (52 mm), of surface area 127 cm2. They were polished at INM, and their density was determined at INM by hydrostatic weighing.
Blood oxidative stress and post-exercise recovery are unaffected byhypobaric and hypoxic environments
Published in Journal of Sports Sciences, 2021
Cassie M. Williamson-Reisdorph, Tiffany S. Quindry, Kathryn G. Tiemessen, John Cuddy, Walter Hailes, Dustin Slivka, Brent C. Ruby, John C. Quindry
Prior to baseline testing, participants were asked to fast for a duration of three hours. Participant characteristic data included the recording of height (Seca 213 Stadiometer, United Kingdom), weight (Befour PS-660 ST Digital Scale, Saukville, WI), body composition, and VO2max assessments. Body composition was quantified via hydrostatic weighing using an electronic load cell-based system (Exertech, Dresbach, MN). Residual lung volume estimates were determined and final body density values from underwater weighing were converted to percent body fat using the Siri equation (Siri, 1961). Maximal oxygen uptake (VO2max) was quantified during a graded exercise cycling protocol on an electronically braked Velotron cycle ergometer (RacerMate, Seattle, WA). Starting at a workload of 95 watts, participants increased exercise intensity by 35 watts every 3-minutes until volitional fatigue was achieved. The highest oxygen uptake value obtained from 15-s intervals was used to determine VO2max. The maximum achieved workload (watts max) of each participant was calculated from the time completed in the last stage, divided by the total stage duration (3-min), multiplied by 35 watts, and added to the watts of the last completed stage (Shute et al., 2020). Expired gases were quantified in 15-s intervals throughout the exercise test using a flow- and gas-calibrated metabolic cart (Parvomedics TrueOne 2400, Sandy, UT).
Heart rate variability in older men on the day following prolonged work in the heat
Published in Journal of Occupational and Environmental Hygiene, 2020
Michael J. Macartney, Sean R. Notley, Robert D. Meade, Christophe L. Herry, Glen P. Kenny
During the preliminary visit, body height, mass, surface area and density, as well as peak aerobic power were determined. Body surface area was derived from measures of standing height (model 2391, Detecto, Webb City, MO, USA) and body mass (IND560, Mettler Toledo Inc., Mississauga, ON, Canada) (Du Bois and Du Bois 1916). Body density was measured using the hydrostatic weighing technique and used to calculate body fat percentage (Siri 1956). Indirect calorimetry was used to quantify peak aerobic power (MCD Medgraphics Ultima Series, MGC Diagnostics, MN, USA) during a progressive incremental exercise protocol (CSEP 1986) on a semi-recumbent cycle ergometer (Corival, Lode B.V., Groningen, Netherlands) in thermoneutral conditions (∼23 °C).