scholarly journals Improved accuracy and precision in electrophoretic NMR experiments. Current control and sample cell design

2020 ◽  
Vol 318 ◽  
pp. 106796 ◽  
Author(s):  
Yuan Fang ◽  
Pavel V. Yushmanov ◽  
István Furó
Keyword(s):  
Current Control ◽  
Cell Design ◽  
Sample Cell ◽  
Accuracy And Precision ◽  
Improved Accuracy

scholarly journals Roaming Dogs in Ushuaia City, Tierra Del Fuego, Argentina. How Many and Why

2021 ◽  
Author(s):  
Emiliano Arona ◽  
Adrián Schiavini
Keyword(s):  
Geographical Location ◽  
Tierra Del Fuego ◽  
Abundance Index ◽  
Simple Index ◽  
Accuracy And Precision ◽  
Main Driver ◽  
Capture Recapture ◽  
The Difference ◽  
Index Estimation ◽  
Improved Accuracy

Abstract Free roaming dogs (FRD) in cities represent an increasing problem. Authorities need numbers of FRDs to evaluate policies implemented and to monitor the dog population. We estimated the number of FRD in Ushuaia city, Argentina, using a photographic capture-recapture methodology. We estimated an abundance index, the power to detect changes in the index, and modeled factors that may explain the spatial distribution of FRD and their welfare status. During three surveys, covering 72 transects along streets (9.9% of the street layout of Ushuaia), we recorded 539 different FRDs. A model with individual heterogeneity in capture-recapture probability gave 12,797 FRDs (95% CI 10,979 − 15,323), reflecting a dog:human relation of 1:6, higher than the relation recommended by the WHO. The abundance index was similar between surveys (8.13 ± 1.36, 8.38 ± 1.46 and 9.55 ± 1.28 dogs/km). The difference needed to detect changes in the index is about twice the standard error of estimates. The best model explaining dogs’ abundance included only geographical location, although two neighbourhoods with 9 transects stand out with 181 different FRDs identified. Together with the good overall dogs’ welfare status, modeling suggests that the behavior of owners is the main driver for the presence of FRDs. We recommend the use of photographic capture-recapture methodologies instead of simple index estimation, due to the small additional effort required and the improved accuracy and precision obtained. We also recommend a permanent systematic design for future surveys, increase the number of survey occasions, and improve the survey process.

High-resolution densitometry: analysis of stained albumin bands as a model for electrophoresis of serum proteins.

1984 ◽  
Vol 30 (6) ◽  
pp. 847-850 ◽  
Author(s):  
D J Epstein ◽  
W E Neeley
Keyword(s):  
Quantitative Analysis ◽  
High Resolution ◽  
Serum Proteins ◽  
Protein Electrophoresis ◽  
Accuracy And Precision ◽  
Rectangular Slit ◽  
New Instrument ◽  
Densitometry Analysis ◽  
Photodiode Array ◽  
Improved Accuracy

Abstract In discussing the principles of quantitative analysis in thin-layer media, we show that requirements for quantitative analysis are not satisfied when stained protein electrophoretic bands are scanned with a conventional rectangular-slit densitometer. We investigated a high-resolution densitometer based on a linear photodiode array as an alternative analytical tool, using stained electrophoretic bands of radio-labeled human serum albumin as a simplified model for results of serum protein electrophoresis. Identical protein bands scanned with both the high-resolution densitometer and a conventional densitometer were quantified with improved accuracy and precision by the new instrument. We also used the high-resolution densitometer to develop a computer model for performance characteristics of a rectangular-slit densitometer.

Validation of the New Gamma Exponent Model for Axial Crack Assessment in Oil and Gas Pipelines

2020 ◽  
Author(s):  
Colin Scott
Keyword(s):  
Oil And Gas ◽  
Mathematical Form ◽  
Gas Pipelines ◽  
New Model ◽  
Service Failures ◽  
Accuracy And Precision ◽  
Oil And Gas Pipelines ◽  
Axial Crack ◽  
Failure Predictions ◽  
Improved Accuracy

Abstract In the late 1960s and early 1970s, the researchers of the NG-18 committee at the Battelle Institute in Columbus, Ohio completed a seminal study on the failure pressures of flaws in oil and gas pipelines. One of the key developments was the “log-secant” equation for the assessment of axial crack-like flaws. The model was later modified to improve its accuracy and precision. The Gamma Exponent Model (GEM) was recently developed for assessment of axial crack-like flaws in pipelines. The developer recognized that the NG-18 log-secant model was theoretically derived on length, and then empirically corrected for depth. The new GEM was theoretically derived on depth, and then empirically corrected for length. The new model is similar in mathematical form to the original NG-18 log-secant model, but there are some key differences. This work is a validation study of the GEM using axial crack failure pressure data from the industry literature. Laboratory tests with machined flaws, and hydrotest and in-service failures with natural metallurgical flaws, are also considered. The results of the GEM are compared to the equivalent failure predictions using other models. The strengths and limitations of the new model are discussed in the context of improved accuracy and precision for crack assessments.

scholarly journals A NanoSIMS 50 L Investigation into Improving the Precision and Accuracy of the 235U/238U Ratio Determination by Using the Molecular 235U16O and 238U16O Secondary Ions

Minerals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 307 ◽  
Author(s):  
N. Zirakparvar ◽  
Cole Hexel ◽  
Andrew Miskowiec ◽  
Julie Smith ◽  
Michael Ambrogio ◽  
...  
Keyword(s):  
Reference Materials ◽  
The Other ◽  
Primary Beam ◽  
Uranium Compounds ◽  
Accuracy And Precision ◽  
Secondary Ions ◽  
Precision And Accuracy ◽  
Improved Accuracy ◽  
Secondary Ion ◽  
238U Ratio

A NanoSIMS 50 L was used to study the relationship between the 235U/238U atomic and 235U16O/238U16O molecular uranium isotope ratios determined from a variety of uranium compounds (UO2, UO2F2, UO3, UO2(NO3)2·6(H2O), and UF4) and silicates (NIST-610 glass and the Plesovice zircon reference materials, both containing µg/g uranium). Because there is typically a greater abundance of 235U16O+ and 238U16O+ molecular secondary ions than 235U+ and 238U+ atomic ions when uranium-bearing materials are sputtered with an oxygen primary ion beam, the goal was to understand whether use of 235U16O/238U16O has the potential for improved accuracy and precision when compared to the 235U/238U ratio. The UO2 and silicate reference materials showed the greatest potential for improved accuracy and precision through use of the 235U16O/238U16O ratio as compared to the 235U/238U ratio. For the UO2, which was investigated at a variety of primary beam currents, and the silicate reference materials, which were only investigated using a single primary beam current, this improvement was especially pronounced at low 235U+ count rates. In contrast, comparison of the 235U16O/238U16O ratio versus the 235U/238U ratio from the other uranium compounds clearly indicates that the 235U16O/238U16O ratio results in worse precision and accuracy. This behavior is based on the observation that the atomic (235U+ and 238U+) to molecular (235U16O+ and 238U16O+) secondary ion production rates remain internally consistent within the UO2 and silicate reference materials, whereas it is highly variable in the other uranium compounds. Efforts to understand the origin of this behavior suggest that irregular sample surface topography, and/or molecular interferences arising from the manner in which the UO2F2, UO3, UO2(NO3)2·6(H2O), and UF4 were prepared, may be a major contributing factor to the inconsistent relationship between the observed atomic and molecular secondary ion yields. Overall, the results suggest that for certain bulk compositions, use of the 235U16O/238U16O may be a viable approach to improving the precision and accuracy in situations where a relatively low 235U+ count rate is expected.

Improved Accuracy and Precision in the Determination of Association Constants

1996 ◽  
Vol 68 (18) ◽  
pp. 3274-3276 ◽  
Author(s):  
Shirley M. Hoenigman ◽  
Christine E. Evans
Keyword(s):  
Association Constants ◽  
Accuracy And Precision ◽  
Improved Accuracy

Remote sensing of animals

2001 ◽  
Vol 25 (3) ◽  
pp. 355-362 ◽  
Author(s):  
Thomas W. Gillespie
Keyword(s):  
Remote Sensing ◽  
Large Scale ◽  
First Century ◽  
Future Research ◽  
Species Dispersal ◽  
Biogeographic Patterns ◽  
Environmental Correlates ◽  
Accuracy And Precision ◽  
Gis Data ◽  
Improved Accuracy

The improved accuracy and precision of animal tracking via satellites has made a significant impact on quantifying large-scale biogeographic patterns for a variety of taxa with important implications for conservation and natural resource management. This paper reviews research undertaken from 1995 to 1999 to provide an overview of advances in the remote sensing of animal movements in both terrestrial and marine environments and to identify promising trends for biogeographic research in the twenty-first century. Remote sensing of animals by satellite provides a new method to test a number of biogeographic hypotheses related to migration and can identify a number of environmental correlates associated with the distributions of species. Tracking of smaller species and increases in sample size are sure to occur as transmitter size and cost continue to decrease in the next decade. Geographers can significantly contribute to the understanding of species dispersal and distributional patterns by combining real-time and archived global and regional datasets with existing data from past studies and future research projects. Only four studies used GIS data or remote sensed imagery in this review, while the remaining studies cited used simple digital line graphs of countries, topography, land and sea boundaries.

scholarly journals Frame Difference Method to Detect Fire and Compare the Accuracy and Precision with Vibe Method

2021 ◽  
Vol 36 (1) ◽  
pp. 629-634
Author(s):  
D. Niharika ◽  
J. Mohana
Keyword(s):  
Conventional Method ◽  
Video Processing ◽  
Difference Method ◽  
High Accuracy ◽  
Monitoring Systems ◽  
Control Group ◽  
Frame Difference ◽  
Accuracy And Precision ◽  
Improved Accuracy ◽  
Experimental Group

Aim: In this paper, the main aim is to detect fire using a novel frame difference method and compare it with conventional method. This is based on video processing and computational methods to reduce the computational complexity. Materials and method: The method was performed over a sample size of 20. Same samples were applied for both the control group and experimental group. Improved accuracy detection was obtained using the proposed method. Results: The Accuracy and precision was found (94.03, 64.62) and (86.24,57.19) was obtained for the frame difference method and conventional method. It also shows a significance of 0.048 for accuracy and 0.018 for precision which is less than 0.05. Conclusion: It would be concluded that the frame difference method is producing high accuracy and precision when compared with the Vibe method. It is applicable for monitoring systems and home security.

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