The accuracy and precision of the advanced Poisson dead-time correction and its importance for multivariate analysis of high mass resolution ToF-SIMS data

2014 ◽  
Vol 46 (9) ◽  
pp. 581-590 ◽  
Author(s):  
Bonnie J. Tyler
Keyword(s):  
Multivariate Analysis ◽  
Dead Time ◽  
Mass Resolution ◽  
High Mass ◽  
Dead Time Correction ◽  
Tof Sims ◽  
Accuracy And Precision ◽  
High Mass Resolution ◽  
Time Correction

High-mass-resolution ToF-SIMS study of chlorine-containing polymers

2002 ◽  
Vol 33 (3) ◽  
pp. 178-184 ◽  
Author(s):  
David Briggs ◽  
Ian W. Fletcher ◽  
Nancy M. Gonçalves
Keyword(s):  
Mass Resolution ◽  
High Mass ◽  
Tof Sims ◽  
High Mass Resolution

scholarly journals Subcellular localisation of cholesterol and phosphocholine with pattern-recognition-imaging-TOF-SIMS

2004 ◽  
Vol 18 (4) ◽  
pp. 503-511 ◽  
Author(s):  
Per Malmberg ◽  
Håkan Nygren ◽  
Peter Sjövall ◽  
Jukka Lausmaa
Keyword(s):  
Pattern Recognition ◽  
Membrane Lipids ◽  
Molecular Ions ◽  
Mass Resolution ◽  
High Mass ◽  
Subcellular Localisation ◽  
Silver Foil ◽  
Tof Sims ◽  
High Mass Resolution ◽  
Recognition Imaging

Molecular ions of cholesterol, and its fragments, and phosphocholine fragments of phospholipids, were localized in single cells with a resolution of <1μm. This is the first example of subcellular localisation of membrane lipids with pattern-recognition, imaging time-of-flight secondary ion mass spectrometry (PRITS) here utilized for identification and subcellular localisation of cholesterol and phosphocholine in PMN leukocytes. Cell imprints were produced by transferring the cell constituents of freeze-dried cells to a silver foil, and the silver surface was analyzed by TOF-SIMS. TOF-SIMS spectra were recorded by scanning the primary ion beam over the analysis area and acquiring a positive mass spectrum of the ions leaving the surface. Data were collected at either high mass resolutionm/Δm >7000 or high lateral resolution. High mass resolution spectra were recorded on reference samples of pure cholesterol and phosphatidylcholine. Characteristic fragment peaks and the silver cationised quasimolecular ion [M+Ag]+were selected as a pattern for the identification of the lipids in TOF-SIMS images of surface-adhering leukocytes. The localisation of membrane lipids showed lateral heterogeneity over the cell surface.

scholarly journals TOF-SIMS Analysis with High Lateral and High Mass Resolution in Parallel

2018 ◽  
Vol 24 (S1) ◽  
pp. 1026-1027
Author(s):  
Felix Kollmer ◽  
Nathan Havercroft ◽  
Anja Henss ◽  
Henrik Arlinghaus ◽  
Wolfgang Paul ◽  
...  
Keyword(s):  
Mass Resolution ◽  
High Mass ◽  
Tof Sims ◽  
High Mass Resolution ◽  
Sims Analysis

scholarly journals Comprehensive SPECT/CT system characterization and calibration for 177Lu quantitative SPECT (QSPECT) with dead-time correction

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Andrea Frezza ◽  
Corentin Desport ◽  
Carlos Uribe ◽  
Wei Zhao ◽  
Anna Celler ◽  
...  
Keyword(s):  
Dead Time ◽  
Dead Time Correction ◽  
Quantitative Spect ◽  
System Characterization ◽  
Time Correction ◽  
Ct System

scholarly journals Dead-Time Correction Applied for Extended Flux-Based Sensorless Control of Assisted PMSMs in Electric Vehicles

Electronics ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 220
Author(s):  
Cheng Lin ◽  
Jilei Xing ◽  
Xingming Zhuang
Keyword(s):  
Control System ◽  
Electric Vehicles ◽  
Dead Time ◽  
Sensorless Control ◽  
Correction Method ◽  
Time Effect ◽  
Dead Time Correction ◽  
Speed Range ◽  
Time Correction ◽  
The Dead

Sensorless control technology of PMSMs is of great importance for safety and reliability in electric vehicles. Among all existing methods, only the extended flux-based method has great performance over all speed range. However, the accuracy and reliability of the extended flux rotor position observer are greatly affected by the dead-time effect. In this paper, the extended flux-based observer is adopted to develop a sensorless control system. The influence of dead-time effect on the observer is analyzed and a dead-time correction method is specially designed to guarantee the reliability of the whole control system. A comparison of estimation precision among the extended flux-based method, the electromotive force (EMF)-based method and the high frequency signal injection method is given by simulations. The performance of the proposed sensorless control system is verified by experiments. The experimental results show that the proposed extended flux-based sensorless control system with dead-time correction has satisfactory performance over full speed range in both loaded and non-loaded situations. The estimation error of rotor speed is within 4% in all working conditions. The dead-time correction method improves the reliability of the control system effectively.

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