Systematic and random error suppression in instrumentation for stripping (chrono)potentiometry

1999 ◽  
Vol 70 (8) ◽  
pp. 3439-3446 ◽  
Author(s):  
Miloslav Št’astný ◽  
Pavel Lepší
Keyword(s):  
Random Error ◽  
Error Suppression ◽  
Systematic And Random Error

scholarly journals An Information System for a Bauxite Mine

10.28945/3062 ◽  
2007 ◽  
Author(s):  
Jim Everett
Keyword(s):  
Information System ◽  
Sodium Carbonate ◽  
Random Error ◽  
Processing Plant ◽  
Exploration Drilling ◽  
Systematic And Random Error ◽  
Bauxite Mine

Bauxite is mined and transported by conveyor to a processing plant, screened and washed, then placed into blended stockpiles to feed the alumina refinery. While being stacked to the stockpile, the ore is sampled. Completed stockpiles must be acceptably close to target grade (composition), not only in alumina, but also in residual silica, carbon and sodium carbonate. The mine is an open-cut pit. Each day the choice of ore to mine, from multiple locations in the pit, is based upon estimates of grade. Estimated grade, from exploration drilling of the area before mining, has both systematic and random error. This paper describes an information system to guide the daily choice of ore to mine. Continually updating the comparison between forecasts and sampled product, the system provides adjusted forecasts. Ore is selected to bring the exponentially smoothed grade to target, in each of the control minerals.

scholarly journals VACUUM AND THERMOPLASTIC MOULD-BASED IMMOBILIZATION SYSTEMS USED IN PATIENT UNDERGOING PELVIC RADIATION THERAPY: A COMPARATIVE STUDY

2020 ◽  
pp. 8-10
Author(s):  
Mayuresh Virkar ◽  
N Arul Kumar ◽  
Pranav Chadha ◽  
Reuben Jake Rodrigues ◽  
Anup Kharde
Keyword(s):  
Random Error ◽  
Target Lesion ◽  
Treatment Session ◽  
Cone Beam ◽  
Pelvic Radiotherapy ◽  
Setup Errors ◽  
Lesion Location ◽  
Significant Difference ◽  
Added Benefit ◽  
Systematic And Random Error

Introduction: The aim of the present study was to compare two immobilization systems for comparison of setup errors in targeted radiotherapy. Methods: Retrospective analysis was done for the patients undergoing radiotherapy from May 2012 to December 2018 at our institution. Immobilization was performed on 30 patients sessions (Vacuum cushion i.e., Vac-Lok™ = 15; Thermoplastic mould i.e., Pelvicast pelvic masks = 15). A total of 763 cone-beams were analysed. The target lesion location was verified by cone-beam computed tomography (CBCT) prior to each session, with displacements assessed by CBCT simulation prior to each treatment session. Systematic setup errors, random setup errors, isocenter deviations in the Medio-lateral (ML), Supero-inferior (SI), Antero-posterior (AP), Rotation (yaw) directions of the patient position was calculated. Results: On comparing the Vac-Lok™ and Pelvicast pelvic masks group with respect to Systematic and random error in the lateral, longitudinal, vertical and YAW direction, no statistically significant difference was seen except the random error in YAW direction (P=0.037, Unpaired t-test). There was no difference observed in comparing the isocentric deviation. Conclusion: It was inferred and concluded that using a vacuum cushion for pelvic radiotherapy provides no added benefit compared to using a thermoplastic mould. Thermoplastic mould is recommended for patients receiving pelvic radiotherapy to improve overall reproducibility.Keywords: Rotational therapy; Radiotherapy; Systematic, random error; Thermoplastic mould; Vacuum cushion.

scholarly journals Systematic and random error components in satellite precipitation data sets

2012 ◽  
Vol 39 (9) ◽  
pp. n/a-n/a ◽  
Author(s):  
Amir AghaKouchak ◽  
Ali Mehran ◽  
Hamidreza Norouzi ◽  
Ali Behrangi
Keyword(s):  
Random Error ◽  
Data Sets ◽  
Precipitation Data ◽  
Satellite Precipitation ◽  
Error Components ◽  
Systematic And Random Error

scholarly journals Parameters' Confidence Intervals Evaluation for Heterogeneous Strain Field Specimen Designs by Using Digital Image Correlation

2021 ◽  
Author(s):  
Andraž Maček ◽  
Janez Urevc ◽  
Bojan Starman ◽  
Miroslav Halilovič
Keyword(s):  
Confidence Intervals ◽  
Random Error ◽  
Optical Measurement ◽  
Image Correlation ◽  
Inverse Identification ◽  
Identification Procedure ◽  
Testing Procedures ◽  
Material Parameters ◽  
Error Distributions ◽  
Systematic And Random Error

This paper aims to compare different heterogeneous test designs from the perspective of the confidence interval quantification of inversely identified parameters, where the influence of a DIC optical system systematic and random error are taken into account. Because the errors in optical measurement can arise from many reasons and sources, our methodology relies on the system's errors determined from initial sets of pictures acquired at the load-free state for hundreds of specimens (over 850 tests over the past three years). In this way, a prior probability distribution of systematic and random error, arisen from the system initial settings and testing procedures are determined. Further, by conducting an inverse identification procedure of linear orthotropic elastic material parameters, the influence of the error distributions is studied for different types of heterogeneous specimens. The presented methodology determines the DIC bias and random error propagation through the inverse identification procedure to individual parameters. For each specimen design, confidence intervals of identified material parameters were determined. The results show the appropriateness of a specimen design for the identification of particular material parameters.

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