A RECORDING UNIT AND ELECTRONIC SHUNT SELECTOR FOR A MASS SPECTROMETER

1947 ◽  
Vol 25b (4) ◽  
pp. 397-404 ◽  
Author(s):  
F. P. Lossing ◽  
R. B. Shields ◽  
H. G. Thode
Keyword(s):  
Magnetic Field ◽  
Mass Spectrum ◽  
Mass Spectrometer ◽  
Direct Current ◽  
Direct Action ◽  
Ion Currents ◽  
Current Amplifier ◽  
Recording Unit ◽  
The Magnetic Field ◽  
Type Mass

A direct action shunt selector has been designed that pre-selects the appropriate shunt so that widely different mass spectrometer ion currents can be recorded linearly on a standard chart. In conjunction with a linear direct current amplifier and a Leeds and Northrup Speedomax pen recorder, this unit allows rapid and accurate recording of a given mass spectrum, which can be scanned by varying either the magnetic field or the ion accelerating potential of the mass spectrometer. When used with a 180° Nier type mass spectrometer with well stabilized circuits, a precision of ± 0.2% in measuring the ratio of [Formula: see text] and [Formula: see text] was obtained. Also, samples of xenon were investigated and the abundances of the isotopes determined.

Visualization of the Magnetic Field Distribution for a Direct Current by Using the Magneto-optical Effect

2016 ◽  
Vol 66 (2) ◽  
pp. 231-234
Author(s):  
Sunghoon JEON ◽  
Shant ARAKELYAN ◽  
Yeonsub LEE ◽  
Yongjae KIM ◽  
Hyeji HAN ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Distribution ◽  
Direct Current ◽  
Magnetic Field Distribution ◽  
Optical Effect ◽  
Magneto Optical Effect ◽  
The Magnetic Field

THE MASS SPECTRUM OF TITANIUM TETRACHLORIDE

1954 ◽  
Vol 32 (11) ◽  
pp. 1039-1043 ◽  
Author(s):  
J. E. Hogg
Keyword(s):  
Titanium Dioxide ◽  
Mass Spectrum ◽  
Mass Spectrometer ◽  
Titanium Tetrachloride ◽  
Chlorine Isotopes ◽  
Commercial Titanium ◽  
Relative Abundances ◽  
Type Mass

An investigation of the mass spectrum of titanium tetrachloride prepared from both commercial titanium dioxide and titanium minerals has been carried out, using a 180° Nier-type mass spectrometer. Values for the relative abundances of the titanium and chlorine isotopes have been found. Measurements of the singly ionized trichloride group show that any variation in the relative abundances of the isotopes of titanium contained in these samples must be less than one per cent.

New Developments to Reduce Arc Blow during SMAW of Pipelines

2018 ◽  
Vol 938 ◽  
pp. 96-103 ◽  
Author(s):  
Sergey V. Baklanov ◽  
Anton S. Gordynets ◽  
A.S. Kiselev ◽  
Mikhail S. Slobodyan
Keyword(s):  
Magnetic Field ◽  
Direct Current ◽  
Arc Welding ◽  
Alternating Current ◽  
Shielded Metal Arc Welding ◽  
Electrode Coating ◽  
Current Electrode ◽  
Repair Work ◽  
Metal Arc Welding ◽  
The Magnetic Field

In some cases, magnetic blow does not allow using direct current for shielded metal arc welding. This is especially true for repair work on pipelines after magnetic flaw detection. Alternating current is useful to control magnetic arc blow during welding. The most promising results give technologies using alternating current with a rectangular waveform. However, the advantages of this method have not been used until now. The main goal of this study is to determine the influence of the parameters of the arc on its stability and the metal transfer mode during shielded metal arc welding under perturbing action of the magnetic field. The proposed methodology of experimental research allowed identifying the cause of arc extinction using direct current electrode positive. This is due to displacement of molten droplets of metal by the magnetic field from of the uneven melted electrode coating and its subsequent separation. This problem was solved using alternating current with the square waveform pulse mode at a frequency of 500 Hz. The amplitude-time parameters of the current pulses provide stabilization of the arc and volume of the molten electrode metal.

Simulation of the influence of constant uniform magnetic field on a miniature LIT mass spectrometer

2017 ◽  
Vol 24 (2) ◽  
pp. 196-205 ◽  
Author(s):  
Yan Feng ◽  
Xiaoqiang Pei ◽  
Yongjun Cheng ◽  
Wenjun Sun ◽  
Gang Li ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Mass Spectrometer ◽  
Performance Enhancement ◽  
Ion Trap ◽  
Ion Trapping ◽  
Trapping Efficiency ◽  
Application Development ◽  
Ion Cloud ◽  
The Magnetic Field

In this paper, the effects of constant uniform magnetic fields on a miniature linear ion trap mass spectrometer with hyperbolic electrodes are simulated using SIMION 8.0 3D software. Magnetic fields in different directions have different effects on the trajectories of the trapped ions and the shape of the ion cloud. When the magnetic field is applied in the z-direction, namely the ion injection direction, the magnetic field will cause the ions focusing to the z-axis, and exert a compression effect on the ion cloud. When the magnetic field is applied in the x-y plane, the original ion cloud will be expanded due to the action of the applied magnetic field, and the ion cloud plane after expansion is always perpendicular to the direction of the magnetic field. The discovery of influence field of magnetic will bring some useful inspiration for the improvement of ion trapping efficiency, mass resolution, sensitivity and trapping capacity, which is conductive to the performance enhancement utilization of magnetic field, even in the industrial application development and other aspects.

A trail of artificial vestibular stimulation: electricity, heat, and magnet

2012 ◽  
Vol 108 (1) ◽  
pp. 1-4 ◽  
Author(s):  
Aasef G. Shaikh
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Field ◽  
Magnetic Resonance ◽  
Semicircular Canals ◽  
Vestibular Stimulation ◽  
Clinical Neurology ◽  
Ion Currents ◽  
Resonance Imaging ◽  
Magnetic Resonance Imaging Mri ◽  
The Magnetic Field

The interaction between the magnetic field of a magnetic resonance imaging (MRI) machine and ion currents within the inner-ear endolymph results in a Lorentz force. This force produces a pressure that pushes on the cupula within the semicircular canals causing nystagmus and vertigo. Here I discuss several implications of this unique and noninvasive way to stimulate the vestibular system in experimental neurophysiology and clinical neurology.

The Simulation of Lane Based on Magnetic Markers Guidance in Laboratory

2013 ◽  
Vol 823 ◽  
pp. 370-373
Author(s):  
Wei Wang
Keyword(s):  
Magnetic Field ◽  
Power Amplifier ◽  
Field Intensity ◽  
Direct Current ◽  
Magnetic Field Intensity ◽  
Single Chip ◽  
Single Chip Microcomputer ◽  
Electric Voltage ◽  
Magnetic Markers ◽  
The Magnetic Field

It is a high expense that the experiment of the testing vehicle based on magnetic markers carrying on outdoors. The distribution and movement of magnetic markers were simulated by direct-current electromagnet, using single chip microcomputer and power amplifier to control direct-current electromagnet. It cuts down the expense of experiment. This dissertation is focus on mainly the design of lane simulator. In the lane simulator, every 0.5m arranged a direct-current electromagnet. When the speed is 80km/h,the electrifying time of the direct-current electromagnet is 0.025s. And the electric voltage of the direct-current electromagnet is 24v, and the magnetic field intensity of the direct-current electromagnet is 12000Gs.

Theoretical Analysis of Magnetic-Electric Prospecting Method for Piping and Seepage Detection of Dyke

2011 ◽  
Vol 103 ◽  
pp. 587-591
Author(s):  
Guo Hong Fu ◽  
Tian Chun Yang
Keyword(s):  
Magnetic Field ◽  
Theoretical Analysis ◽  
High Precision ◽  
Direct Current ◽  
Magnetic Survey ◽  
Field Magnitude ◽  
Magnetic Field Magnitude ◽  
The Magnetic Field ◽  
Electric Prospecting

On the basis of presenting the piping and seepage detection by magnetic-electric prospecting method, the authors analyzed and testified validity of the method. According to calculated results, the magnitude of magnetic field of artificial current was smaller on section if electrodes and cables were set rationally. Usually, the magnetic field magnitude of piping had several times to more than decuple comparing with magnetic field of artificial current. So, the magnetic abnormity could be detected easily by high-precision magnetometers. At the same time, their curves’ characteristics were different evidently. The analysis result shows that the piping and seepage of dyke can be detected by combining method of direct current supplying and high-precision magnetic survey.

Design and Study of Magnetization Characteristics of a Magnetostrictive (Tb0.3Dy0.7Fe1.95) Actuator under Zero Pre-Stress Conditions for Direct Current Input

2013 ◽  
Vol 705 ◽  
pp. 281-287
Author(s):  
Raghavendra Joshi ◽  
Ravikiran Kadoli
Keyword(s):  
Magnetic Field ◽  
Direct Current ◽  
Stress Conditions ◽  
Disc Brake ◽  
Magnetostrictive Material ◽  
Free Air ◽  
Current Input ◽  
Magnetostrictive Actuator ◽  
The Magnetic Field

This paper presents the design of actuator using magnetostrictive material under zero pre-stress conditions for direct current input, which is being developed to move friction pads of a disc brake for braking action. Comparison of analytical, experiment and Maxwell simulation of coils in free air is being carried out to predict the magnetic field generated by them and magneto motive force reaching the measuring end of magnetostrictive material. Experiments are being conducted to verify the performance of magnetostrictive actuator for dc input under zero-preload conditions. A set of magnetization curves are being predicted using Jiles-Atherton model in the context of control applications that require an accurate characterization of the relation between input applied magnetic field and strain output by the actuator. Further the validation of Jiles-Atherton model results is being done with the results obtained from experiments.

Shape of the Magnetic Field between Conical Pole Faces

1959 ◽  
Vol 14 (9) ◽  
pp. 816-818
Author(s):  
A. J. H. Boerboom ◽  
H. A. Tasman ◽  
H. Wachsmuth
Keyword(s):  
Magnetic Field ◽  
Series Expansion ◽  
Mass Spectrometer ◽  
Main Path ◽  
Gap Width ◽  
The Magnetic Field

Calculation is made of the shape of the magnetic field between conical pole faces, which may be used as an inhomogeneous deflecting field for a mass spectrometer. The results are expressed as a series expansion in the coordinates around the main path, and in the gap width at the radius of the main path.

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