Characterization of absolute phase angle in wideband current shunts at Inmetro

2021 ◽  
Author(s):  
Rodrigo Rodrigues Nascimento Zampilis ◽  
Marcus Vinicius Viegas Pinto ◽  
Leonardo Augusto Abreu De Souza ◽  
Gean Marcos Geronymo ◽  
Regis Pinheiro Landim
Keyword(s):  
Phase Angle ◽  
Absolute Phase

scholarly journals A Dynamic Semi-Circular Bending Configuration for the Rheological Characterization of Asphalt Mixtures

2020 ◽  
Vol 9 (3) ◽  
pp. 150-164
Author(s):  
Marina Cauhape Casaux ◽  
Silvia Angelone ◽  
Fernando Martinez
Keyword(s):  
Rheological Properties ◽  
Phase Angle ◽  
Dynamic Modulus ◽  
Plane Surface ◽  
Poisson Ratio ◽  
Asphalt Mixtures ◽  
Rheological Characterization ◽  
State Of Stress ◽  
Dynamic Loading Conditions

Many experimental procedures have been proposed for the determination of the rheological properties of asphalt mixtures. Among them, the indirect tensile test (ITT) has gained a lot of attention because of its relative simplicity and advantages. However, a biaxial state of stress is developed into the sample and then, the Poisson ratio must be estimated or measured for the calculations of the dynamic modulus. Looking for a testing configuration with the same simplicity and advantages, this paper proposes the Semi-Circular Bending (SCB) geometry with dynamic loading conditions in order to characterize the rheological properties (dynamic modulus and phase angle) of asphalt mixtures. Samples compacted in the laboratory or cored from in-service pavements can be used. A uniaxial state of stress is developed in the lower plane surface of the sample doing negligible the influence of the Poisson ratio on the dynamic modulus calculations. A specific experimental configuration was adopted and a 2D-FEM model has been used for the development of an equation for the calculation of the dynamic modulus. Two different asphalt mixtures were tested at diverse testing temperatures and loading frequencies. The obtained results have been analyzed and compared with those acquired with the more conventional testing configuration in uniaxial compression. An excellent agreement has been found for either the dynamic modulus or the phase angle with both sets of results. It could be concluded that the SCB configuration has been validated as a simple and promising methodology for the characterization of the viscoelastic response of asphalt mixtures.

Characterization of Phase-Angle Jump in Radial Systems Using Incremental Voltage Phasors

2019 ◽  
Vol 55 (2) ◽  
pp. 1117-1125 ◽  
Author(s):  
Angela Espin-Delgado ◽  
Juan Ramon Camarillo-Penaranda ◽  
Gustavo Ramos
Keyword(s):  
Phase Angle

Rheological Characterization of Pharmaceutical and Cosmetic Formulations for Cutaneous Applications

2019 ◽  
Vol 25 (21) ◽  
pp. 2349-2363 ◽  
Author(s):  
Nicolas Huang
Keyword(s):  
Shear Stress ◽  
Shear Rate ◽  
Phase Angle ◽  
Shear Thinning ◽  
Rheological Characterization ◽  
Rheological Behaviors ◽  
Key Concepts ◽  
Cosmetic Formulations ◽  
Broad Subject

Rheology, the study of the flow and deformation of matter, can be a daunting subject for scientists new to this field. However, its importance in characterization and optimization of formulations is indisputable. This review intends to provide basic and practical rheological notions in order to better understand the key concepts such as shear stress, shear rate, viscosity, elastic and viscous moduli and phase angle, and learn to distinguish between flow and oscillation experiments. We will explain the different rheological behaviors such as shear thinning, thixotropy or viscoelasticity. Throughout this review, these concepts will be illustrated with examples taken from pharmaceutical and cosmetic formulations. Rheology is a broad subject and this review does not intend to be comprehensive, but rather to be concise and pedagogical.

Characterization of SASW Phase Angle and Phase Velocity Measurement Uncertainty

2004 ◽  
Vol 27 (2) ◽  
pp. 11433 ◽  
Author(s):  
L David Suits ◽  
TC Sheahan ◽  
KT Marosi ◽  
DR Hiltunen
Keyword(s):  
Phase Velocity ◽  
Measurement Uncertainty ◽  
Phase Angle ◽  
Velocity Measurement

scholarly journals Su1452 – Characterization of Nutritional Status Through Phase Angle and Vector Analysis of Bioelectrical Impedance in Patients with Chronic Pancreatitis and Pancreatic Cancer

2019 ◽  
Vol 156 (6) ◽  
pp. S-556
Author(s):  
Carolina de Luna ◽  
Mariana Gasca Ponce ◽  
Paola Estrada Azarte ◽  
Astrid Ruiz Margáin ◽  
Mario Peláez Luna ◽  
...  
Keyword(s):  
Pancreatic Cancer ◽  
Chronic Pancreatitis ◽  
Nutritional Status ◽  
Phase Angle ◽  
Bioelectrical Impedance ◽  
Vector Analysis

Characterization of a Multilayered SAW Pressure Sensor with Low Temperature Variability

2014 ◽  
Vol 656 ◽  
pp. 413-422 ◽  
Author(s):  
Bing Zhang ◽  
Hong Hu ◽  
R. Ben-Mrad
Keyword(s):  
Low Temperature ◽  
Phase Angle ◽  
Coupling Coefficient ◽  
Pressure Sensors ◽  
Time Domain Analysis ◽  
Domain Analysis ◽  
Frequency Domain Analysis ◽  
Propagation Characteristics ◽  
Rf Signal

A method to reduce temperature effects in SAW pressure sensors is presented. A layer of SiO2 is deposited on the surface of 128YX LiNbO3 in order to achieve a high coupling coefficient (κ2) as well as a low temperature coefficient of delay (TCD). The FEM tool COMSOL Multiphysics is used to estimate the phase velocity and frequency of the input RF signal using an eigenfrequency analysis. Then by using a time domain analysis, a surface acoustic wave (SAW) is generated by IDTs and its wave propagation characteristics are obtained. During this process, the boundary reflection is removed by adding a perfectly matched layer (PML). The reflected signal on the IDT can be detected; as such the phase angle is calculated. By applying different pressures to the sensor, a relationship between pressure and phase angle is determined. Using frequency domain analysis, the coupling coefficient is computed with high accuracy. The TCD is calculated at different SiO2 thicknesses and the SiO2 thickness corresponding to a zero TCD and high coupling coefficient is obtained. A prototype is tested to validate these values.

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