scholarly journals Development and Validation of New Reverberation Chamber for Wireless Devices

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Dong-Uk Sim ◽  
Sang Il Kwak ◽  
Jong Hwa Kwon ◽  
Seong-Ook Park
Keyword(s):  
Standard Deviation ◽  
Electromagnetic Compatibility ◽  
Initial Structure ◽  
Wireless Devices ◽  
Reverberation Chamber ◽  
Working Volume ◽  
Wireless Terminal ◽  
Reasonable Approach ◽  
Measurement And Evaluation ◽  
Development And Validation

This paper proposes a reverberation chamber structure consisting of new reflectors and mode stirrers for electromagnetic compatibility and wireless terminal measurements. The key design considerations for them are determined through a reasonable approach to analyze the eigenmode for a reverberation chamber and the standard deviation of its working volume based on 3D simulation. The final designs are expected to improve the standard deviation performance of the initial structure of the reverberation chamber and provide a better mode stirring environment. The results measured in the fabricated chamber demonstrate that these predictions are clearly realized. The results satisfy the main requirements of this paper, which are defined in consideration of the specifications of commercial reverberation chamber products. Therefore, the reverberation chamber of this paper is expected to be useful for performance measurement and evaluation of commercial wireless terminals. To verify this logical approach to obtain a good design and its results, the results measured in the actual fabricated reverberation chamber are described along with analytical and computational results.

Electric Field Uniformity Characteristic of a Reverberation Chamber with a Composite QRD

2013 ◽  
Vol 684 ◽  
pp. 518-521
Author(s):  
Eugene Rhee ◽  
Ji Hoon Lee
Keyword(s):  
Electric Field ◽  
Electromagnetic Compatibility ◽  
Quadratic Residue ◽  
Test Facility ◽  
Uniform Electric Field ◽  
Reverberation Chamber ◽  
Standard Requirement ◽  
International Standard ◽  
Field Uniformity ◽  
Simulation Results

This paper presents the electric field characteristics in a reverberation chamber which is an electromagnetic compatibility test facility that uses a stirrer to generate a uniform electric field inside it. In this paper, a diffuser is introduced from acoustics and newly designed to overcome problems of a stirrer. To validate the effect of a diffuser, a composite quadratic residue diffuser and a reverberation chamber are modeled. Then, the field uniformity inside the reverberation chamber is simulated by XFDTD 6.2 simulation program. Simulation results show that the electric field uniformity in the reverberation chamber satisfies the international standard requirement. This shows that the composite quadratic residue diffuser can be substituted for a stirrer.

scholarly journals Development and validation of spectrophotometric method for phenylephrine hydrochloride estimation in nasal drops formulations

2008 ◽  
Vol 27 (2) ◽  
pp. 149 ◽  
Author(s):  
Ivana Savić ◽  
Goran Nikolić ◽  
Vladimir Banković
Keyword(s):  
Standard Deviation ◽  
Sodium Hydroxide ◽  
Relative Standard Deviation ◽  
Spectrophotometric Method ◽  
Molar Absorptivity ◽  
Dosage Forms ◽  
Phenylephrine Hydrochloride ◽  
Relative Standard ◽  
Development And Validation

Simple, accurate and reproducible UV-spectrophotometric method was developed and validated for the estimation of phenylephrine hydrochloride in pharmaceutical nasal drops formulations. Phenylephrine hydrochloride was estimated at 291 nm in 1 mol⋅dm-3 sodium hydroxide (pH 13.5). Beer’s law was obeyed in the concentration range of 10–100 μg⋅cm−3 (r2 = 0.9990) in the sodium hydroxide medium. The apparent molar absorptivity was found to be 1.63×103 dm3⋅mol−1⋅cm−1. The method was tested and validated for various parameters according to the ICH (International Conference on Harmonization) guidelines. The detection and quantitation limits were found to be 0.892 and 2.969 μg⋅cm−3, respectively. The proposed method was successfully applied for the determination of phenylephrine hydrochloride in pharmaceutical nasal drops formulations. The results demonstrated that the procedure is accurate, precise and reproducible (relative standard deviation < 1 %), while being simple, cheap and less time consuming, and hence can be suitably applied for the estimation of phenylephrine hydrochloride in different dosage forms.

scholarly journals Maximum Working Volume Evaluation in a Non-Canonical Reverberation Chamber

2009 ◽  
Vol 45 (3) ◽  
pp. 1646-1649 ◽  
Author(s):  
S.L. Avila ◽  
M.A. Santos ◽  
D. Weinzierl ◽  
L. Krahenbuhl ◽  
R. Perrussel ◽  
...  
Keyword(s):  
Reverberation Chamber ◽  
Working Volume

Development and Validation of Reverberation-Chamber Type Whole-Body Exposure System for Mobile-Phone Frequency

2008 ◽  
Vol 27 (1) ◽  
pp. 73-82 ◽  
Author(s):  
K. B. Jung ◽  
T. H. Kim ◽  
J. L. Kim ◽  
H. J. Doh ◽  
Y. C. Chung ◽  
...  
Keyword(s):  
Mobile Phone ◽  
Whole Body ◽  
Reverberation Chamber ◽  
Exposure System ◽  
Development And Validation

scholarly journals A Significance Test for Reverberation-Chamber Measurement Uncertainty in Total Radiated Power of Wireless Devices

2016 ◽  
Vol 58 (1) ◽  
pp. 207-219 ◽  
Author(s):  
Kate A. Remley ◽  
Chih-Ming Jack Wang ◽  
Dylan F. Williams ◽  
Johannes J. aan den Toorn ◽  
Christopher L. Holloway
Keyword(s):  
Measurement Uncertainty ◽  
Significance Test ◽  
Wireless Devices ◽  
Reverberation Chamber ◽  
Radiated Power

Development and validation of the Canadian retail cut beef yield grades

2020 ◽  
Author(s):  
Jose Segura Plaza ◽  
J. L. Aalhus ◽  
Nuria Prieto Benavides ◽  
Ivy L. Larsen ◽  
M.E.R. Dugan ◽  
...  
Keyword(s):  
Standard Deviation ◽  
External Validation ◽  
Beef Carcasses ◽  
Coefficient Of Concordance ◽  
The Difference ◽  
Development And Validation

The USDA system has five retail cut yield (RCY) classes, whereas the former Canadian system had three total lean yield (TLY) classes. 720 beef carcasses were used to develop a modified grade ruler, harmonizing the Canadian grades into five classes. Beef carcasses (n=750) from three Canadian federally-inspected facilities were graded using both USDA and Canadian (harmonized ruler) systems for external validation. Agreement between the USDA RCY and the Canadian TLY was high (R2=0.80). The validation between the harmonized ruler and the USDA RCY showed a standard deviation of the difference of 1.32 and a coefficient of concordance of 0.83.

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