scholarly journals PENGGUNAAN MEDIA JARUM BERGOYANG DALAM MATERI MEDAN MAGNET UNTUK MENINGKATKAN PEMAHAMAN KONSEP PESERTA DIDIK

2021 ◽  
Vol 1 (2) ◽  
pp. 159-167
Author(s):  
BUDI HENDRATNO
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Magnetic Force ◽  
Assembly Process ◽  
The Media ◽  
Three Stages ◽  
Line Trajectory ◽  
Magnetic Poles ◽  
Lines Of Force

The purpose of this paper is to further improve students' understanding of the concept of magnetic fields, by creating media that can show the characteristics of magnetic fields, which are abstract quantities and vector quantities. This media is designed in addition to being able to prove the existence of an abstract magnetic field, it can also show the direction of the magnetic lines of force, show the shape of the curved trajectory of the magnetic lines of force, and can directly determine the magnetic poles if the magnet is made by electromagnetic means. While the media that is often used so far can only prove its existence. The process of making this media through three stages, namely; design, assemble and test. This media is designed by using a needle that is placed above the water and brought close to a magnet with the media term "Jarum Bergoyang". The assembly process uses simple tools and easily available materials. The testing process was carried out on magnetic practicum activities by class IX-C students of SMP Negeri 2 Saketi 2015. The results of the practicum can be concluded that swaying needle media can be used to prove the existence of a magnetic field, can determine the direction of magnetic force lines, can show the shape of the line trajectory. magnetic lines of force and can directly show the magnetic poles of the coil. ABSTRAKTujuan dari penulisan ini adalah untuk lebih meningkatkan pemahaman siswa terhadap konsep medan magnet, dengan membuat media yang dapat menunjukan karakteristik medan magnet, yang merupakan besaran yang bersifat abstrak dan besaran vektor. Media ini dirancang selain bisa membuktikan keberadaan medan magnet yang bersifat abstrak, juga dapat menunjukan arah garis-garis gaya magnet, menunjukan bentuk lintasan lengkung garis-garis gaya magnet, dan bisa secara langsung menentukan kutub-kutub magnet apabila magnetnya itu dibuat dengan cara elektromagnetik. Sementara media yang sering dipakai selama ini hanya dapat membuktikan keberadaannya saja. Proses pembuatan media ini melalui tiga tahapan yaitu ; merancang, merakit dan menguji. Media ini dirancang dengan menggunakan jarum yang ditempatkan di atas air dan didekatkan dengan magnet dengan istilah media jarum bergoyang. Proses perakitan menggunakan alat yang sederhana dan bahan yang mudah didapat. Proses pengujian dilakukan pada kegiatan praktikum kemagnetan oleh siswa kelas IX-C SMP Negeri 2 Saketi Tahun 2015. Hasil praktikum dapat disimpulkan bahwa media jarum bergoyang dapat digunakan untuk membuktikan adanya medan magnet, dapat menentukan arah garis-garis gaya magnet, dapat menunjukan bentuk lintasan garis-garis gaya magnet dan dapat secara langsung menunjukan kutub-kutub magnet kumparan.

scholarly journals Magnetic behaviour of supraconducting tin spheres

1935 ◽  
Vol 151 (873) ◽  
pp. 316-333 ◽  
Author(s):  
K. Mendelssohn ◽  
J. D. Babbitt ◽  
Frederick Alexander Lindemann
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Magnetic Force ◽  
Magnetic Behaviour ◽  
The Body ◽  
Whole Body ◽  
Measured Field ◽  
Lines Of Force ◽  
As If ◽  
Field Strengths

Until a year ago it was generally accepted that if a body is made supraconducting while in a magnetic field the lines of magnetic force were "frozen in," i. e ., whatever lines of force passed through the body at the time when it became supraconducting remained there afterwards, unaffected by any change in the external field, so long as the body was supraconducting. Meissner and Ochsenfeld, however, showed that this supposition was not true. They measured field strengths in the immediate neighbourhood of cylinders which had been cooled to supraconductivity in an external magnetic field, and found that the field of force was then of the same nature as that to be expected in the neighbourhood of perfectly diamagnetic bodies. Thus it appeared that when a body becomes supraconducting in a magnetic field the lines of force are all pressed out of the body, and the induction inside the body falls to zero. At the same time, however, these authors report on another experiment, the result of which appears to us not entirely in accordance with the assumption that the induction in the whole body became zero. They measured the field strengths inside and outside a hollow cylinder, after it had become supraconducting in a field perpendicular to its axis, and found again that the field strength outside was as if the cylinder were almost perfectly diamagnetic, but the field inside was appreciably the same as if the cylinder were non-supraconducting. We therefore made a number of experiments, hoping to find out more exactly the nature of the phenomenon.

Novel synthesis of 1,5-disubstituted-1,2,3-triazolines catalysed by Zepto magnetic microspheres under the influence of a rotating magnetic field

2019 ◽  
Vol 97 (3) ◽  
pp. 163-168 ◽  
Author(s):  
Priyanka Sharma ◽  
Srinivasu V. Vallabhapurapu ◽  
Wei H. Ho ◽  
Nanjundaswamy M. Hemmaragala
Keyword(s):  
Magnetic Field ◽  
Magnetic Force ◽  
Rotating Magnetic Field ◽  
Magnetic Microspheres ◽  
The Novel ◽  
Aryl Azides ◽  
Alkyl Aryl ◽  
Novel Synthesis ◽  
Bead Diameter ◽  
Magnetic Poles

The novel reactor has been designed to perform chemical reactions under the influence of a magnetic field generated by alternating magnetic poles as a function of time. The system was successfully employed to synthesize a series of 1,5-disubstituted-1,2,3-triazolines via the regioselective [3 + 2] cycloaddition reactions between alkyl/aryl azides and nitroolefins catalysed by Zepto (para magnetic ultra-blue carboxy functionalized) microspheres (bead diameter 2.5 μm). All of the reactions went smoothly without any adverse effect on nitro, cyano, thienyl, hydroxy, halogens, and ether functions at 25 ± 2 °C and afforded 82%–99% pure products at a magnetic field of 18.99 mT and an exposure time of 180–240 min. The influence of the magnetic force exerted on the magnetic materials was found to enhance the catalytic activity of microspheres. The catalyst could easily be separated by simple centrifugation, which could be reused for at least 15 runs with no loss in activity.

New scheme for computing the magnetic field resulting from a uniformly magnetized arbitrary polyhedron

Geophysics ◽  
1999 ◽  
Vol 64 (1) ◽  
pp. 70-74 ◽  
Author(s):  
D. Guptasarma ◽  
B. Singh
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Arbitrary Shape ◽  
Numerical Evaluation ◽  
Solid Angle ◽  
New Approach ◽  
Polygonal Surface ◽  
Magnetic Poles ◽  
The Magnetic Field

The magnetic field at any point outside a uniformly magnetized polyhedron of arbitrary shape is obtained by adding the fields resulting from the effective free magnetic poles on each of the polygonal surfaces of the polyhedron. For each polygonal surface, the components of the field at the point of observation are expressed in terms of new line integrals around the edges of the polygon and the solid angle subtended by the polygon at the point of observation. The line integrals are standard elementary forms. This new approach makes the numerical evaluation of the magnetic fields for such models much simpler and faster than previously published methods.

New magnetic algorithm to detect community structure based on the magnets’ approach

2019 ◽  
Vol 33 (13) ◽  
pp. 1950166
Author(s):  
Mohamed Amine Midoun ◽  
Xingyuan Wang
Keyword(s):  
Magnetic Field ◽  
Community Structure ◽  
Magnetic Force ◽  
Community Structures ◽  
Mobile Nodes ◽  
The Law ◽  
Magnetic Poles ◽  
Organizational Principles ◽  
Acting Force ◽  
The Magnetic Field

This research paper investigates areas of identifying the community structures which can help us to uncover organizational principles in complex networks. So far, a large number of algorithms have been introduced to discover the community structures, but the majority of these algorithms are suitable just for the unweighted networks. We present a new hierarchical method that identifies communities in weighted and unweighted networks based on the magnetic field. In our approach, the nodes are considered as a set of stationary/mobile magnetic nodes where these magnets can attract and repulse under the influence of an acting force. Based on the magnetic force between magnetic poles, we propose the law of node gravitation LNG and node repulsion LNR. Our method identifies a set of stationary magnetic nodes (SMNs). Each SMN attracts a group of mobile nodes and at the same time, they do not influence one another by any acting force. Then, we construct the stationary magnetic communities (SMCs) based on the law of community gravitation and repulsion. Our method finishes when all the magnets in the network become stationary. The experimental results are presented to prove the performance of our method in several real networks including weighted and unweighted networks.

scholarly journals Properties of MHD turbulence and its consequences for the ISM and ICM

2009 ◽  
Vol 5 (H15) ◽  
pp. 464-465
Author(s):  
D. Falceta-Gonçalves ◽  
G. Kowal ◽  
A. Lazarian
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Large Scale ◽  
Collisionless Plasma ◽  
The Other ◽  
Mhd Turbulence ◽  
The Media ◽  
The Magnetic Field ◽  
Theoretical Results ◽  
Ism Magnetic Fields

AbstractIt is well known that the interstellar (ISM) and intergalactic (ICM) media are threaded by large scale magnetic fields. The understanding of its role on the dynamics of the media is, however, still in progress. For the ISM, magnetic fields may control or, at least, play a major role on the turbulence cascade leading to the star formation process. The ICM, on the other hand, is assumed to be thermally dominated but still the magnetic field may play an important role on the processes of acceleration and propagation of cosmic rays. In this work we provide a review of the latest theoretical results on the evolution of MHD turbulence under collisional and collisionless plasma approaches.

Der Gyro-Relaxations-Effekt

1957 ◽  
Vol 12 (10) ◽  
pp. 822-825 ◽  
Author(s):  
A. Schlüter
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Degrees Of Freedom ◽  
Extreme Temperatures ◽  
Heating Mechanism ◽  
The Magnetic Field ◽  
Lines Of Force

Es wird gezeigt, daß ständig eine Relaxation der Freiheitsgrade der Bewegung entlang den magnetischen Feldlinien relativ zu den Freiheitsgraden der Umlaufsbewegueg um diese magnetischen Feldlinien eintritt, wenn die Stärke des Magnetfeldes mit der Zeit oder längs der Feldlinien sich ändert. Diese Relaxation führt zu einem Temperaturanstieg des Plasmas und zwar auch dann, wenn die magnetischen Feldänderungen periodisch erfolgen. Dieser Prozeß dürfte einen günstigen Heizungsmechanismus darstellen, um zu extrem hohen Temperaturen zu gelangen.It is shown that a relaxation of the degrees of freedom of the motion along the lines of force of a magnetic field relative to those of the gyration around these lines always occurs if the strength of the magnetic fields changes with time or along the trajectories. This relaxation causes an increase in the temperature of a plasma, even if the magnetic field changes are periodic, and may represent a convenient heating mechanism for achieving extreme temperatures.

scholarly journals Video Magnetic Field and Velocity Fields of Solar Flares and Relative Active Region

1989 ◽  
Vol 104 (2) ◽  
pp. 219-222
Author(s):  
Ai Guoxiang ◽  
Li Jing
Keyword(s):  
Magnetic Field ◽  
Fine Structure ◽  
Active Region ◽  
Magnetic Fields ◽  
Solar Flares ◽  
Solar Magnetic Field ◽  
Velocity Fields ◽  
Magnetic Pole ◽  
Magnetic Poles

By means of Solar Magnetic Field Telescope, the fine structure of video magnetic fields (5324A) and sight-of-line velocity fields (4861A) of flare active region on July 23 (E53, S19) and Aug. 8(W25, S28) in 1987 has been obtained. The main characters are following:1. The flares occur in places where there are compressive and osmotic motion between opposite magnetic poles. In some causes, the osmotic opposite magnetic pole dissipates after the flares.

scholarly journals Experimental researches in electricity. Twenty-sixth series. On magnetic conducting power and atmospheric magnetism

1851 ◽  
Vol 5 ◽  
pp. 998-1000
Keyword(s):  
Magnetic Field ◽  
Differential Effect ◽  
Magnetic Force ◽  
The Other ◽  
Parallel Lines ◽  
Magnetic Action ◽  
Magnetic Poles ◽  
Experimental Researches ◽  
The Magnetic Field ◽  
Two Bodies

The remarkable results respecting oxygen and nitrogen described in the last Series, and the absence of any change of volume under strong magnetic action, led the author to apply for a time the idea of conducting power to the magnetic phenomena there described, meaning by that phrase the capability which bodies possess of affecting the transmission of the magnetic force without any reference to the process by which that transmission is effected; and assuming that two bodies are at the same time in the magnetic field, and that one displaces the other, he considers the result as a differential effect of their difference in conducting power. If a free portion of space be considered with lines of equal magnetic force passing across it, they will be straight and parallel lines. If a sphere of paramagnetic matter be placed in such a space, they will gather upon and in the sphere, being no longer parallel in their course, nor of equal intensity in every part; or if a sphere of diamagnetic matter replace the former sphere, the lines of force will open out where the sphere is, being again no longer parallel in direction nor uniform in force. When the field of magnetic force is formed between the opposite flat ends of two large magnetic poles, then these are affected, and the globes also, and there are mutual actions; a paramagnetic body, if a little elongated, points axially and tends to go to the iron walls of the field, whilst a similar diamagnetic body points equatorially, and tends to go to the middle of the field. Paramagnetic bodies repel each other, and so also do diamagnetic bodies; but one of each class being taken, they attract one another.

Finishing of Metal Parts in Magnetic Field Based on Abrasion

2011 ◽  
Vol 325 ◽  
pp. 517-522 ◽  
Author(s):  
János Kodácsy
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Experimental Research ◽  
Magnetic Force ◽  
Machining Processes ◽  
Metal Parts ◽  
Abrasive Grains ◽  
Machining Force ◽  
Magnetic Abrasive Polishing ◽  
Magnetic Poles

Denomination Magnetism Aided Machining (MAM) comprises a number of relatively new industrial machining processes (mainly finishing and surface improving) developed presently, too. MAM is effective – among others – for polishing, deburring and burnishing ofmetal parts. The magnetic force makes these processes simpler and more productive. Machining force is generated by an adjustable electromagnetic field between two magnetic poles within the working area ensuring the necessary pressure and speed difference between the tools (abrasive grains, pellets or rollers) and the workpieces. The authors give a brief outline of these modern processes. The paper summarizes the results of the experimental research carried out by the authors mainly in the field of Magnetic Abrasive Polishing (MAP) and Magnetic Abrasive Barrel Deburring (MABD).

In Situ Observation of Diamagnetic Fluid Flow in High Magnetic Fields

2014 ◽  
Vol 616 ◽  
pp. 188-193 ◽  
Author(s):  
Yan Wang ◽  
Noriyuki Hirota ◽  
Hidehiko Okada ◽  
Tie Liu ◽  
Qiang Wang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Fluid Flow ◽  
Magnetic Fields ◽  
Magnetic Force ◽  
Potassium Sulfate ◽  
High Magnetic Fields ◽  
High Concentration ◽  
Sample Dissolution ◽  
High Concentration Solution

The effect of high magnetic field on diamagnetic fluid flow has been studied by in-situ optical observation. The Schlieren optics utilizable under high magnetic fields was developed to carry out in-situ observation of the behavior of feeble magnetic fluids. Using a crystal of the diamagnetic aluminum potassium sulfate dodecahydrate, the behavior of the downward flow of high concentration solution in the sample dissolution process was observed. It was found that the direction of diamagnetic fluid flow was changed under spatially varied magnetic field. This phenomenon was understood qualitatively by considering the magnetic force acting on the high concentration solution and the surrounding solution.

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