scholarly journals Optimal Measurement Network of Pairwise Differences

2019 ◽  
Vol 59 (11) ◽  
pp. 4720-4728 ◽  
Author(s):  
Huafeng Xu
Keyword(s):  
Optimal Measurement ◽  
Pairwise Differences

Development of the mathematical model for assessing the optimal measurement step when surveying the depth of the underground pipeline from the ground

2020 ◽  
Vol 10 (4) ◽  
pp. 364-371
Author(s):  
Ruslan V. Aginey ◽  
◽  
Rustem R. Islamov ◽  
Alexey A. Firstov ◽  
Elmira A. Mamedova ◽  
...  
Keyword(s):  
Mathematical Models ◽  
Survey Data ◽  
Ground Surface ◽  
Maximum Error ◽  
Large Error ◽  
Bending Stress ◽  
Buried Pipeline ◽  
Optimal Measurement ◽  
Pipeline Section ◽  
Bending Stresses

Existing methods for estimating the bending stresses of buried pipeline section based on the survey data for the depth of the axis of the pipeline from the ground surface are characterized by a large error between the real values of the bending stress and the values of the bending stress obtained from the calculation results based on the survey data. The purpose of this study is to improve the methodology for calculating the bending stresses of buried pipeline section based on the results of determining the depth of the axis of the pipeline from the ground surface, taking into account the design features of the pipeline and the used search equipment. Mathematical models are proposed that allow for the set value of the maximum error in determining bending stresses for a particular pipeline to choose the optimal measurement step before the survey, which will allow to reduce the error. Explanations are given on the choice of the maximum step of the study based on the strength characteristics of the pipeline. A calculation is provided that confirms the adequacy of the developed mathematical models and the possibility of their application in practice.

A Harmonic Source Location Method Based on PMU Measurements in Distribution Network

2015 ◽  
Vol 775 ◽  
pp. 409-414
Author(s):  
Bing Jun Li ◽  
Su Quan Zhou ◽  
Xiao Xiang Lun
Keyword(s):  
Power System ◽  
State Estimation ◽  
Distribution Network ◽  
Measured Data ◽  
Optimal Measurement ◽  
Location Method ◽  
Measurement Placement ◽  
Minimum Number ◽  
Harmonic Source ◽  
The Cost

It is of great importance to identify the location of the harmonic sources for the harmonic governance in the power system. Applied with optimal measurement placement (OMP) and harmonic state estimation (HSE), this paper presents a novel process based on PMU measurements to locate the harmonic sources in the distribution network. Considering the cost and the observability, the OMP can provide a scheme of the measurement placement with the minimum number of PMU measurements. In order to simplify the HSE equation, the measured data are converted to the form of voltage by the method proposed in this paper.By solving the HSE equation, the location and magnitude of the harmonic source are evaluated. The methodology is applied to the IEEE 33-bus system, and the obtained results are properly analyzed.

scholarly journals Caloric expenditure assessment among older adults: Criterion validity of a novel accelerometry device

2013 ◽  
Vol 19 (11) ◽  
pp. 1382-1387 ◽  
Author(s):  
Sarah T Stahl ◽  
Salvatore P Insana
Keyword(s):  
Older Adults ◽  
Standard Deviation ◽  
Community Health ◽  
Measurement Technique ◽  
Criterion Validity ◽  
Self Report ◽  
Model Program ◽  
Caloric Expenditure ◽  
Optimal Measurement ◽  
The Mean

Criterion validity of a novel accelerometry device that measures caloric expenditure (Fitbit) was evaluated against a self-report estimation of caloric expenditure (Community Healthy Activities Model Program for Seniors) in older adults. Community Health Activities Model Program for Seniors and Fitbit estimates of total caloric expenditure per day were significantly correlated ( r = .61, p < .05). Bland–Altman plots indicated that 70 percent of participants’ data were within 1 standard deviation of the mean difference between measures. These preliminary findings suggest that the Fitbit may be considered a viable instrument for measuring daily caloric expenditure among older adults. However, further work is required to determine the optimal measurement technique for caloric expenditure among older adults.

scholarly journals Electrochemical Detection of Small Volumes of Glyphosate with Mass-Produced Non-Modified Gold Chips

2020 ◽  
Vol 57 (3) ◽  
pp. 32-39
Author(s):  
V. Mizers ◽  
V. Gerbreders ◽  
E. Sledevskis ◽  
I. Kokina ◽  
E. Tamanis ◽  
...  
Keyword(s):  
Printed Circuit Board ◽  
Square Wave Voltammetry ◽  
Circuit Board ◽  
Electrochemical Cells ◽  
Optimal Measurement ◽  
Printed Circuit ◽  
Dna Mutations ◽  
Wave Voltammetry ◽  
Control Samples ◽  
Herbicide Glyphosate

AbstractMass-produced printed circuit board (PCB) electrodes were used as electrochemical cells to detect the widely-used herbicide glyphosate. Square wave voltammetry (SWV) was used to determine the presence of glyphosate in aqueous Cu(NO3)2 solution. Optimal measurement conditions for the detection of glyphosate with PCB electrodes were found. It was determined that glyphosate was able to soak into the growing plants from the substrate. Glyphosate-contaminated plant juice was distinguished from control samples using the PCB electrode. Glyphosate-contaminated plants were found to have DNA mutations.

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