scholarly journals Verification of a Charging Potential Measurement Method using a Parallel Plate Electrostatic Analyzer

2010 ◽  
Vol 8 (0) ◽  
pp. 1-7
Author(s):  
Naomi KURAHARA ◽  
Mengu CHO
Keyword(s):  
Parallel Plate ◽  
Measurement Method ◽  
Potential Measurement ◽  
Electrostatic Analyzer

Design of a Steady-State, Parallel-Plate Thermal Conductivity Apparatus for Nanofluids and Comparative Measurements With Transient HWTC Apparatus

2010 ◽  
Author(s):  
Milivoje M. Kostic ◽  
Casey J. Walleck
Keyword(s):  
Thermal Conductivity ◽  
Steady State ◽  
Parallel Plate ◽  
Measurement Method ◽  
Mixture Theory ◽  
Hot Wire ◽  
Electro Magnetic ◽  
Magnetic Phenomena ◽  
Thermal Conductivities

A steady-state, parallel-plate thermal conductivity (PPTC) apparatus has been developed and used for comparative measurements of complex POLY-nanofluids, in order to compare results with the corresponding measurements using the transient, hotwire thermal conductivity (HWTC) apparatus. The related measurements in the literature, mostly with HWTC method, have been inconsistent and with measured thermal conductivities far beyond prediction using the well-known mixture theory. The objective was to check out if existing and well-established HWTC method might have some unknown issues while measuring TC of complex nano-mixture suspensions, like electro-magnetic phenomena, undetectable hot-wire vibrations, and others. These initial and limited measurements have shown considerable difference between the two methods, where the TC enhancements measured with PPTC apparatus were about three times smaller than with HWTC apparatus, the former data being much closer to the mixture theory prediction. However, the influence of measurement method is not conclusive since it has been observed that the complex nano-mixture suspensions were very unstable during the lengthy steady-state measurements as compared to rather quick transient HWTC method. The nanofluid suspension instability might be the main reason for very inconsistent results in the literature. It is necessary to expend investigation with more stable nano-mixture suspensions.

scholarly journals Monitoring Change of Body Fluid during Physical Exercise using Bioimpedance Spectroscopy and Finite Element Simulations

2019 ◽  
Vol 2 (1) ◽  
pp. 79-85 ◽  
Author(s):  
Lisa Röthlingshöfer ◽  
Mark Ulbrich ◽  
Sebastian Hahne ◽  
Steffen Leonhardt
Keyword(s):  
Finite Element ◽  
Body Composition ◽  
Physical Exercise ◽  
Body Fluid ◽  
Measurement Method ◽  
The Body ◽  
Fluid Loss ◽  
Bioimpedance Spectroscopy ◽  
Data Set ◽  
Potential Measurement

Abstract Athletes need a balanced body composition in order to achieve maximum performance. Especially dehydration reduces power and endurance during physical exercise. Monitoring the body composition, with a focus on body fluid, may help to avoid reduction in performance and other health problems. For this, a potential measurement method is bioimpedance spectroscopy (BIS). BIS is a simple, non-invasive measurement method that allows to determine different body compartments (body fluid, fat, fat-free mass). However, because many physiological changes occur during physical exercise that can influence impedance measurements and distort results, it cannot be assumed that the BIS data are related to body fluid loss alone. To confirm that BIS can detect body fluid loss due to physical exercise, finite element (FE) simulations were done. Besides impedance, also the current density contribution during a BIS measurement was modeled to evaluate the influence of certain tissues on BIS measurements. Simulations were done using CST EM Studio (Computer Simulation Technology, Germany) and the Visible Human Data Set (National Library of Medicine, USA). In addition to the simulations, BIS measurements were also made on athletes. Comparison between the measured bioimpedance data and simulation data, as well as body weight loss during sport, indicates that BIS measurements are sensitive enough to monitor body fluid loss during physical exercise.

scholarly journals Double parallel‐plate electrostatic analyzer for Tara end‐loss studies

1986 ◽  
Vol 57 (8) ◽  
pp. 1789-1791 ◽  
Author(s):  
James D. Sullivan ◽  
J. A. Casey ◽  
J. H. Irby ◽  
D. K. Smith ◽  
E. Sevillano
Keyword(s):  
Parallel Plate ◽  
Electrostatic Analyzer
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