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Sensitivity Analysis of the Simply Noise-matched Receiving Coil for NMR Experiments Meas. Sci. Rev. (IF 0.9) Pub Date : 2020-10-29 Peter Andris; Ivan Frollo
The article analyzes the sensitivity of unmatched receiving coil for the NMR scanner. Receiver of the scanner was investigated from the point of view of noise features. Theory of the noise figure has been modified to utilize the receiver for digitization of its own noise and the noise figure calculation. The resulting noise figure has been measured with different source impedances and the optimal value
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Application of Metrological Approaches in the Design of Calibration Equipment for Verification of Float Level Gauges Meas. Sci. Rev. (IF 0.9) Pub Date : 2020-10-29 Ľuboš Kučera; Branislav Patin; Tomáš Gajdošík; Rudolf Palenčár; Jakub Palenčár; Miloš Ujlaky
The paper deals with a scientific approach for an increase of accuracy of measurement and possibilities for automation of the standard equipment for calibration and verification of float level gauges. They are applied in high-capacity fuel storage tanks, and they are intended to measure the level of stored liquid hydrocarbons. In the submitted paper, we describe original approaches towards metrological
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Electromagnetic Shielding Performance Measurement for Braided-Shield Power Cables at Low Frequency Regimes Meas. Sci. Rev. (IF 0.9) Pub Date : 2020-10-29 Zhongyuan Zhou; Peng Hu; Xiang Zhou; Mingjie Sheng; Peng Li; Qi Zhou
Although various measurement techniques have been applied to both qualitative and quantitative evaluation for the electromagnetic shielding performance of braided-shield power cables, the existing measurements cannot directly assess the low-frequency shielding performance (typically below 100 kHz) due to factors such as ground-loop effects and dynamic range problem in measurement. To solve these, an
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Thermophysical Parameters of Carbonate Rock estimated by Slab Model Developed for Pulse Transient Technique Meas. Sci. Rev. (IF 0.9) Pub Date : 2020-10-29 Rupali Tiwari; Vlastimil Boháč; Peter Dieška; Gregor Götzl
The slab model has been used for parameter estimation from the measurement performed by the Pulse Transient Technique. The estimation of thermophysical parameters was done on carbonate rock sample. In addition to basic thermal parameter for example thermal diffusivity, thermal conductivity and specific heat capacity, the slab model takes into account the heat capacity of the heat source, as well as
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Using a Gauge Block for Derivation of Parameters of Four Laser Triangulation Sensors in a Local Coordinate System Meas. Sci. Rev. (IF 0.9) Pub Date : 2020-10-29 Ján Buša; Miroslav Dovica; Mikhail Zhabitsky
The paper discusses the derivation of an accurate coordinate measuring system consisting of two, three, or four sensors based on the records of four fixed laser triangulation sensors done for a gauge block in movement. Three-dimensional case is considered. In the simulations, using a set of distances quadruplets, parameters of sensors in a local sensors coordinate system are determined through a least
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The Effect of Low-pass Pre-filtering on Subvoxel Registration Algorithms in Digital Volume Correlation: A revisited study Meas. Sci. Rev. (IF 0.9) Pub Date : 2020-10-29 Xiang Zou; Kai Li; Bing Pan
In digital volume correlation (DVC), random image noise in volumetric images leads to increased systematic error and random error in the displacements measured by subvoxel registration algorithms. Previous studies in DIC have shown that adopting low-pass pre-filtering to the images prior to the correlation analysis can effectively mitigate the systematic error associated with the classical forward
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Time-Frequency Analysis of Partial Discharge Current Pulses in Different Gas Environment under Lightning Impulse Meas. Sci. Rev. (IF 0.9) Pub Date : 2020-08-24 Kemal Arikan; Emel Önal; Serhat Şeker
This paper deals with a time-frequency analysis of the measured partial discharge (PD) currents in different insulation gases. These gas environments consist of a pure SF6 (sulphur-hexafluoride) and sulphur-hexafluoride and nitrogen (1 % SF6 + 99 % N2) mixture, under both positive and negative lightning impulse (LI) voltage stresses. In this study, the short time Fourier transform was used to extract
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Detecting an Unknown Abrupt Change in the Band Center of the Fast-Fluctuating Gaussian Random Process Meas. Sci. Rev. (IF 0.9) Pub Date : 2020-08-24 Oleg Chernoyarov; Tatiana Demina; Yuri Kabanov; Alexander Makarov
The generalized maximum likelihood algorithm is introduced for detecting the abrupt change in the band center of a fast-fluctuating Gaussian random process with the uniform spectral density. This algorithm has a simpler structure than the ones obtained by means of common approaches and it can be effectively implemented on the base of both modern digital signal processors and field-programmable gate
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3D-PIV Measurement for EHD Flow of Spiked Tubular Electrode Corona Discharge in Wide Electrostatic Precipitator Meas. Sci. Rev. (IF 0.9) Pub Date : 2020-08-24 Dongjie Yan; Ziang Zhang; Zhenyang Li; Ya Yu; Hao Gong; Xueming Huang
The electrohydrodynamic (EHD) flow induced by a corona discharge has an important influence on the movement and collection of fine particles in an electrostatic precipitator. In this paper, three-dimensional particle image velocimetry (3D-PIV) is used to investigate the impact of different primary flow velocities and applied voltage on diffusion and transport of the spiked tubular electrode corona
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Developments and Progress in Non-contact Eye Tonometer Calibration Meas. Sci. Rev. (IF 0.9) Pub Date : 2020-08-24 Peter Pavlásek; Jan Rybář; Stanislav Ďuriš; Branislav Hučko; Miroslav Chytil; Alena Furdová; Sylvia Lea Ferková; Juraj Sekáč; Vítězslav Suchý; Patrik Grosinger
This paper focuses on the problematic of intraocular pressure (IOP) measurements, performed by non-invasive methods. More specifically, the devices that are connected with the presented finding are non-contact tonometers that use concentrated air stream and optical sensors to determine the IOP within a human’s eye. The paper analyzes various influential factors that have an effect on the determination
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Active Vision Reconstruction Based on Ratio Invariability of Triangle Areas Generated from Triangle Array in Affine Space Meas. Sci. Rev. (IF 0.9) Pub Date : 2020-08-24 Guan Xu; Hui Shen; Xiaotao Li
An active-vision process is presented by the affine invariability of the ratio of triangle areas to reconstruct the 3D object. Firstly, a plate with the triangle array is designed in the same plane of the planar laser. The image of the plate is rectified from the projection space to the affine space by the image of the line at infinity. Then the laser point and the centroids of the triangles constitute
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Processing Accuracy of Instantaneous Values of a Stochastic Signal in an Inertial Measurement System Meas. Sci. Rev. (IF 0.9) Pub Date : 2020-08-24 Adam Kowalczyk; Rafał Chorzępa
The article presents an analysis of the dynamic error occurring when processing a stochastic signal in an inertial measurement system. The problem was illustrated using both a calculation and a laboratory example. The technique of conditional averaging of signals was used in the experiment. The possibility to minimize the root mean square value of the error as well as the need for a time correction
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Novel Method of Contactless Sensing of Mechanical Quantities Meas. Sci. Rev. (IF 0.9) Pub Date : 2020-07-24 René Harťanský; Martin Mierka; Mikuláš Bittera; Jozef Hallon; Ján Halgoš; Jaroslav Hricko; Robert Andok; Michal Rafaj
This article addresses the method of sensing mechanical quantities, in particular force and pressure, without the electrical connection of the sensing element and the electronics. The information about the mechanical quantity is transmitted only by evaluating the changes in the electromagnetic field created around the sensor. The sensor is designed on the basis of a flexible micro-electro-mechanical
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Analysis of Periodicities in Surface Topography of Cold rolled sheets Using Data Captured by Camera System Meas. Sci. Rev. (IF 0.9) Pub Date : 2020-07-24 Jaromir Zavadil; Josef Strom Bartunek; David Fojtik
A method for surface analysis of cold rolled sheets is proposed in this paper. The approach is based on a low-cost specially built camera system followed by spectral analysis of the data captured from metal surfaces. The focus is on the changes in the surface topography caused by cold rolling with emphasis towards periodicities in the processed surface. Angular profile of the spectrum is calculated
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High-resolution Three-dimensional Surface Imaging Microscope Based on Digital Fringe Projection Technique Meas. Sci. Rev. (IF 0.9) Pub Date : 2020-07-24 Cheng-Yang Liu; Tzu-Ping Yen; Chien-Wen Chen
The three-dimensional (3-D) micro-scale surface imaging system based on the digital fringe projection technique for the assessments of microfiber and metric screw is presented in this paper. The proposed system comprises a digital light processing (DLP) projector, a set of optical lenses, a microscope, and a charge coupled device (CCD). The digital seven-step fringe patterns from the DLP projector
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A Comparison of Non-negative Tucker Decomposition and Parallel Factor Analysis for Identification and Measurement of Human EEG Rhythms Meas. Sci. Rev. (IF 0.9) Pub Date : 2020-07-24 Zuzana Rošt’áková; Roman Rosipal; Saman Seifpour; Leonardo Jose Trejo
Analysis of changes in the brain neural electrical activity measured by the electroencephalogram (EEG) plays a crucial role in the area of brain disorder diagnostics. The elementary latent sources of the brain neural activity can be extracted by a tensor decomposition of continuously recorded multichannel EEG. Parallel factor analysis (PARAFAC) is a powerful approach for this purpose. However, the
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A Linearized Model of FID Signal for Increasing Proton Magnetometer Precision Meas. Sci. Rev. (IF 0.9) Pub Date : 2020-07-24 Chao Tan; Ruijie Fu; Chenguang Wu; Xinglin Li
A linearized model of frequency measurement for the Free Induction Decay (FID) signal is proposed to increase the Proton Magnetometer (PM) precision. First, the nonlinear model of frequency measurement is set up according to the characteristic of the FID signal. Then, according to the error analysis of the MCFM method, the model is linearized on the condition of precision requirement. Furthermore,
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FSI Computation and Experimental Verification of Fluid Flow in Flexible Tubes Meas. Sci. Rev. (IF 0.9) Pub Date : 2020-07-24 Dominik Šedivý; Simona Fialová; Roman Klas; Michal Kotek
Presented paper is focused on the experimental and computational study of fluid flow in pipes with flexible walls. One possible real example of this phenomenon is the blood flow in arteries or their substitutes in the human body. The artery material itself should be understood as anisotropic and heterogeneous. Therefore, the experiment was carried out on the deforming tube, made of silicone (polydimethylsiloxane
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Oil Phase Velocity Measurement of Oil-Water Two-Phase Flow with Low Velocity and High Water Cut Using the Improved ORB and RANSAC Algorithm Meas. Sci. Rev. (IF 0.9) Pub Date : 2020-06-02 Lianfu Han; Haixia Wang; Yao Cong; Xingbin Liu; Jian Han; Changfeng Fu
Velocity is an important parameter for fluid flow characteristics in profile logging. Particle tracking velocimetry (PTV) technology is often used to study the flow characteristics of oil wells with low flow velocity and high water cut, and the key to PTV technology is particle matching. The existing particle matching algorithms of PTV technology do not meet the matching demands of oil drops in the
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Gaussian Recursive Filter for Nonlinear Systems with Finite-step Correlated Noises and Packet Dropout Compensations Meas. Sci. Rev. (IF 0.9) Pub Date : 2020-06-02 Li-Guo Tan; Cheng Xu; Yu-Fei Wang; Hao-Nan Wei; Kai Zhao; Shen-Min Song
This paper is focused on the nonlinear state estimation problem with finite-step correlated noises and packet loss. Firstly, by using the projection theorem repeatedly, the mean and covariance of process noise and measurement noise in the condition of measurements before the current epoch are calculated. Then, based on the Gaussian approximation recursive filter (GASF) and the prediction compensation
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Matrix Presentation of Uncertainties Propagation in the Realization of ITS-90 Temperature Scale using Standard Platinum Resistance Thermometers Meas. Sci. Rev. (IF 0.9) Pub Date : 2020-06-02 Rudolf Palenčár; Stanislav Ďuriš; Jakub Palenčár; Martin Halaj; Ľubomír Šooš
The paper presents a matrix approach to the propagation of uncertainties in the realization of the ITS-90 using Standard Platinum Resistance Thermometers (SPRT) calibrated at Defining Fixed Points (DFPs). The procedure allows correlations to be included between SPRT resistances measured during the calibration at the DFPs (i.e., the realization of the ITS-90) and the resistances measured during the
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Computer Modelling of Two-level Digital Frequency Synthesizer with Poisson Probability Distribution of Output Pulses Meas. Sci. Rev. (IF 0.9) Pub Date : 2020-06-02 Jinfei Wang; Krzysztof Przystupa; Volodymyr Maksymovych; Roman Stakhiv; Orest Kochan
The article presents the modified structure of the two-level digital frequency synthesizer (TLDFS), which combines the properties of classical digital frequency synthesizers (DFS) and Poisson pulse sequence generators (PPSG). The analysis of the statistical characteristics of synthesizer output signal, obtained in computer modelling with the use of appropriate software, has been carried out, which
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Reliability of Sports Medical Solutions Handgrip and Jamar Handgrip Dynamometer Meas. Sci. Rev. (IF 0.9) Pub Date : 2020-06-02 Stefan Marković; Milivoj Dopsaj; Veljko Veljković
The aim of this paper is to determine inter-reliability, concurrent validity, and interchangeability of the SMS HG dynamometric system and a Jamar digital dynamometer for hand grip strength measurements performed in two relevant positions of the elbow joint, i.e. 90 ° flexion and 180 ° (full) extension. The sample in this research consisted of 61 participants and included 27 women and 34 men. Statistically
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Importance of Basset History Force for the Description of Magnetically Driven Motion of Magnetic Particles in Air Meas. Sci. Rev. (IF 0.9) Pub Date : 2020-06-02 Andrej Krafcik; Peter Babinec; Melania Babincova; Ivan Frollo
Lungs are used as an attractive possibility for administration of different therapeutic substances for a long time. An innovative method of such administration widely studied nowadays is the application of aerosolized magnetic particles as the carriers to the lungs in the external non-homogeneous magnetic field. For these reasons we have studied dynamics of such a system on a level of particle trajectory