Simple and Inexpensive Test Equipment for Magnetic Flux Measurements in a Ferromagnetic Core

1980 ◽  
Vol 17 (4) ◽  
pp. 301-307
Author(s):  
Arifur Rahman
Keyword(s):  
Magnetic Flux ◽  
Laboratory Test ◽  
Magnetization Curve ◽  
Magnetic Circuit ◽  
Test Equipment ◽  
Test Results ◽  
Ferromagnetic Core ◽  
Flux Measurements ◽  
Normal Magnetization

This paper describes a simple laboratory test equipment for classroom determination of the normal magnetization curve and hysteresis loop of a built-in ferromagnetic core. The circuit details, steps of design of the magnetic circuit coils and test results are also presented.

Current-Fed Flyback Push-Pull DC-DC Converter Based on Three-Phase Transformer

2014 ◽  
Vol 614 ◽  
pp. 164-167
Author(s):  
You Chen Yuan ◽  
Yang Zhang ◽  
Yu Wei Chen
Keyword(s):  
Magnetic Flux ◽  
High Frequency ◽  
Magnetic Circuit ◽  
Magnetic Loop ◽  
Test Results ◽  
Static And Dynamic Characteristics ◽  
Three Phase ◽  
Independent Functions ◽  
Flow Through ◽  
Efficiency And Reliability

Three-phase current-fed flyback push-pull dc-dc converter is proposed in this paper, which is a new circuit topology putting into practice based on current-fed flyback push-pull dc-dc converter. Structure is simplified; cost is cut down; efficiency and reliability are improved all by the high frequency three-phase transformer technique that carries out functions of flyback transformer as well as push-pull transformer at the same time. Three-phase transformer can be separated into relatively independent functions of flyback transformer and push-pull transformer with the reluctance produced by the magnetic gap in the central phase; the flyback transformer produces only common-mode flux in the magnetic circuit of push-pull transformer and does not influence its output signal; the magnetic flux in push-pull transformer is blocked by the magnetic gap and can only flow through the outer magnetic loop. Investigational device is designed; static and dynamic characteristics are observed and test results are verified by the experimentation.

Determination of the Influence of an Anticorrosive Layer on the Strength of Link Mining Chains/Określenie Wpływu Warstwy Antykorozyjnej Na Wytrzymałość Łańcuchów Ogniwowych – Górniczych

2014 ◽  
Vol 59 (2) ◽  
pp. 367-380
Author(s):  
Mariusz Szot
Keyword(s):  
Laboratory Test ◽  
Complete Analysis ◽  
Test Results ◽  
Operational Parameters ◽  
Modeling Studies ◽  
Laboratory Test Results

Abstract Using link mining chains is related to the proper way of selecting the type of the chain. The operational parameters of the chain are associated with a risk to the employees who operate haulage systems using scraper conveyors. A complete analysis of operational parameters is possible to be made only after relevant tests are performed. The study presents laboratory test results as well as modeling studies which allowed to determine the influence of the anticorrosive protection of the chain’s surface on its operational parameters.

scholarly journals Determination of crushing energy during vibratory crushing

2019 ◽  
Vol 2 (1) ◽  
pp. 287-294
Author(s):  
Marcin Mazur
Keyword(s):  
Energy Consumption ◽  
Power Consumption ◽  
Laboratory Test ◽  
Electrical Energy ◽  
Energy Requirements ◽  
Gap Size ◽  
Test Results ◽  
Kinematic Parameters ◽  
Jaw Crusher

Abstract The paper presents a new method of determining the energy consumption for vibratory crushing. Using the laboratory vibratory jaw crusher with kinematic actuation of the jaws, the study of determining power consumption while crushing limestone and diabase was conducted. During the study, electrical energy used on the crushing process was measured as a function of changing design and kinematic parameters of the vibratory crusher, i.e.: jaws stroke, the outlet gap size and frequency of jaws vibration. The article presents program of the research, the laboratory test stand of the vibratory jaw crusher KW 40/1 and the test results. Comparing the theoretical crushing energy requirements, determined by the Bond hypothesis, with the values measured during tests a large differences were observed. Using the Bond hypothesis the Vibratory Work Indexes were determined for the tested materials. Their values are higher than limestone and diabase Work Indexes available in the known literatures. The explanation may be greater amount of energy transferred to the material during vibratory crushing, which results in much higher efficiency of the crushing process.

Large-scale Motion of Solar Filaments

2000 ◽  
Vol 179 ◽  
pp. 205-208
Author(s):  
Pavel Ambrož ◽  
Alfred Schroll
Keyword(s):  
Magnetic Flux ◽  
Proper Motion ◽  
Time Scale ◽  
Large Scale ◽  
Accuracy Of Measurements ◽  
Solar Filaments ◽  
General Movement ◽  
Scale Motion ◽  
Velocity Scatter

AbstractPrecise measurements of heliographic position of solar filaments were used for determination of the proper motion of solar filaments on the time-scale of days. The filaments have a tendency to make a shaking or waving of the external structure and to make a general movement of whole filament body, coinciding with the transport of the magnetic flux in the photosphere. The velocity scatter of individual measured points is about one order higher than the accuracy of measurements.

Effects of contact gap on nondestructive evaluation using magnetic measurement for ferromagnetic steel

2020 ◽  
Vol 64 (1-4) ◽  
pp. 969-975
Author(s):  
Hiroaki Kikuchi ◽  
Yuki Sato
Keyword(s):  
Magnetic Flux ◽  
Nondestructive Evaluation ◽  
Effective Permeability ◽  
Magnetic Circuit ◽  
Magnetic Measurement ◽  
Air Gap ◽  
Motive Force ◽  
Hysteresis Curve ◽  
Evaluation Technique ◽  
Ferromagnetic Steel

We investigated effects of contact gap on magnetic nondestructive evaluation technique using a magnetic single-yoke probe. Firstly, we evaluated hysteresis curves and impedance related to permeability of the material measured by a single-yoke probe, when an air gap length between the probe and specimens changes. The hysteresis curve gradually inclines to the axis of the magneto-motive force and magneto-motive force at which the magnetic flux is 0 decreases with increasing the gap length. The effective permeability also decreases with increasing the gap thickness. The incremental of gap thickness increases the reluctance inside the magnetic circuit composed of the yoke, specimen and gap, which results in the reduction of flux applying to specimen.

LUMINESCENT DETERMINATION OF SUGAR IN NATURAL HONEY

2020 ◽  
Vol 0 (4) ◽  
pp. 29-32
Author(s):  
B.M. GAREEV ◽  
◽  
A.M. ABDRAKHMANOV ◽  
G.L. SHARIPOV ◽  
◽  
...  
Keyword(s):  
Quantum Dots ◽  
Laboratory Test ◽  
Aqueous Solutions ◽  
Analytical Method ◽  
Sugar Content ◽  
Carbon Quantum Dots ◽  
Photoluminescence Intensity ◽  
Sucrose Content ◽  
Natural Honey

The photoluminescence of carbon quantum dots synthesized from natural honey and mixtures of honey and sugar has been studied. An increase in the sugar content leads to a decrease in the photoluminescence intensity without changing the shape of the luminescence spectrum of these quantum dots aqueous solutions, which is associated with a decrease in the yield of their synthesis in the sugar presence. The discovered effect can be used to detect sugar in honey. When examining five different market samples of flower honey using this method, two of them showed a significant decrease in the photoluminescence intensity. A laboratory test for compliance with GOST 19792-2017 Standard requirements established an excess of the sucrose content in these samples. Luminescent determination of sugar in honey does not require complicated equipment and can be used to develop a new analytical method for determining the sugar content in counterfeit natural honey.

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