scholarly journals Factors Affecting Accuracy and Precision in Measuring Material Surfaces

2017 ◽  
Author(s):  
Jason A. Griggs
Keyword(s):  
Factors Affecting ◽  
Material Surfaces ◽  
Accuracy And Precision

X-ray Fluorescence and Fire-Assay Collection: Useful Partners in the Determination of the Platinum-Group Elements

1990 ◽  
Vol 34 ◽  
pp. 277-283
Author(s):  
Basil T Eddy ◽  
Belinda L Stuckenberg ◽  
Gemot Pansi
Keyword(s):  
Internal Standard ◽  
Platinum Group Elements ◽  
Nickel Sulphide ◽  
Fire Assay ◽  
Factors Affecting ◽  
X Ray ◽  
Accuracy And Precision ◽  
Platinum Group ◽  
The Individual

AbstractThis paper describes the determination of the individual platinum-group elements by X-ray fluorescence after nickel-sulphide fire-assay collection. The platinum-group sulphide residue obtained after the dissolution of the nickel is dissolved in acid, and reduced to the metal by use of sodium borohydride. The finely divided metals are then filtered onto a millipore filter, and measured by X-ray fluorescence spectroscopy. The procedure makes use of gold as an internal standard. Factors affecting the accuracy and precision are investigated.

scholarly journals Metrological Evaluation of Human–Robot Collaborative Environments Based on Optical Motion Capture Systems

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3748
Author(s):  
Leticia González ◽  
Juan C. Álvarez ◽  
Antonio M. López ◽  
Diego Álvarez
Keyword(s):  
Motion Capture ◽  
Motion Tracking ◽  
Industrial Robot ◽  
Human Motion ◽  
Factors Affecting ◽  
Collaborative Environment ◽  
Accuracy And Precision ◽  
Optical Motion ◽  
Optical Motion Capture ◽  
Metrological Evaluation

In the context of human–robot collaborative shared environments, there has been an increase in the use of optical motion capture (OMC) systems for human motion tracking. The accuracy and precision of OMC technology need to be assessed in order to ensure safe human–robot interactions, but the accuracy specifications provided by manufacturers are easily influenced by various factors affecting the measurements. This article describes a new methodology for the metrological evaluation of a human–robot collaborative environment based on optical motion capture (OMC) systems. Inspired by the ASTM E3064 test guide, and taking advantage of an existing industrial robot in the production cell, the system is evaluated for mean error, error spread, and repeatability. A detailed statistical study of the error distribution across the capture area is carried out, supported by a Mann–Whitney U-test for median comparisons. Based on the results, optimal capture areas for the use of the capture system are suggested. The results of the proposed method show that the metrological characteristics obtained are compatible and comparable in quality to other methods that do not require the intervention of an industrial robot.

scholarly journals Novel Analytical Study For The Charge-Transfer Reactions Of Omeprazole With 2,3-Dichloro-Naphthoquinone And 2,3,5,6-Tetrabromo- 1,4-Benzoquinone: Application For The Development Of Microwell Assay Of Omeprazole

2018 ◽  
Vol 15 (1) ◽  
pp. 6099-6115
Author(s):  
Saad A Alkahtania ◽  
Ashraf M Mahmoud ◽  
Samer S. Abu Al-Rubb
Keyword(s):  
Charge Transfer ◽  
Analytical Study ◽  
Pharmaceutical Formulations ◽  
Fixed Time ◽  
Factors Affecting ◽  
Accuracy And Precision ◽  
Repeatability And Reproducibility ◽  
Charge Transfer Reactions ◽  
Reaction Vessels

Novel analytical study was performed in order to develop and validate new high-throughput microwell-based spectrophotometric assays for determination of omeprazole (OMZ) in its pharmaceutical formulations. The proposed assays were based on the charge-transfer (CT) reaction of OMZ with 2,3-dichloronaphthoquinone (DCNQ) and 2,3,5,6-tetrabromo-1,4-benzo-quinone (BROM). In the present study, the CT reactions was carried out in microwell plates as reaction vessels in order to increase the automation of the assays and the efficiency of its use in quality control laboratories (QCLs). All factors affecting the CT reactions were carefully studied, and the conditions were optimized. Kinetics and stoichiometry of the CT reactions were investigated, and the mechanism was postulated. Activation energy of the CT reactions was determined and found to be 13.87 and 16.27 Kcal mol−1 for the reaction of OMZ with DCNQ and BROM, respectively. The initial rate and fixed time methods were applied for generating the calibration graphs for determination of OMZ concentrations. Under the optimum conditions, the linear range was 0.145 – 1.45 x 10-4 and 1.45 – 7.25 x 10-4 M with LOD of 0.6 and 6.0 microgram ml-1 for DCNQ and BROM, respectively. Analytical performance of the proposed methods, in terms of accuracy and precision, was statistically validated and the results were satisfactory; RSD was <2.8% for both repeatability and reproducibility. The proposed methods were successfully applied to the analysis of OMZ in its dosage forms and the recovery results (98.64 – 100.6 ± 0.25 -2.74 %) were comparable with those of the reported method. The developed method may provide a safer and economic tool for the analysis of OMZ in QCLs.

Study on High Anti-Vibration Machine Bed

2011 ◽  
Vol 143-144 ◽  
pp. 694-697
Author(s):  
Li Xia Wang ◽  
Ye Ming Zhang ◽  
Yan Shi
Keyword(s):  
Experimental Study ◽  
Natural Frequency ◽  
Vibration Machine ◽  
Factors Affecting ◽  
Accuracy And Precision ◽  
Definite Structure

Vibration is one of the most important factors affecting the accuracy and precision of machine bed. Under the definite structure, different materials and fillings will affect the natural frequency of the machine bed. 3 kinds of candidate materials (HT300.20#.20# & concrete) are selected to build different machine bed. Based on FEM, modal analyses are performed on the different machine beds, 4 sets of natural frequency are sampled on each one. Aiming to better performance in vibration, the machine bed is optimized with higher natural frequency. Through experimental study on the machine bed, it is clear that the optimized machine bed can meet the needs to perform better in machining.

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