Investigation of the stability of the reference frequency of an optical discriminator in an external gas-discharge absorption cell

1975 ◽  
Vol 22 (6) ◽  
pp. 744-748
Author(s):  
A. L. Mel'tsin ◽  
V. V. Shchegolev
Keyword(s):  
Gas Discharge ◽  
Reference Frequency ◽  
Absorption Cell ◽  
The Stability ◽  
Optical Discriminator

Arbitrary Waveform Generator Based on Improved DDS Technology

2013 ◽  
Vol 336-338 ◽  
pp. 1587-1592
Author(s):  
Peng Wei ◽  
Ting Jin Gao ◽  
Hui Fang
Keyword(s):  
Sine Wave ◽  
Reference Frequency ◽  
Frequency Synthesis ◽  
Waveform Generator ◽  
Arbitrary Waveform Generator ◽  
Direct Digital Frequency Synthesis ◽  
Waveform Data ◽  
Arbitrary Waveform ◽  
The Stability ◽  
Multiple Reference

This article describes an arbitrary waveform generator based on DDS (Direct Digital frequency Synthesis) technology. The arbitrary waveform generator can easily generate DC, square wave, sine wave or any other arbitrary waveform in mill volt or even microvolt level. The generator uses ARM and 51MCU dual-processor system framework. In the system design, we use multiple reference frequency source and dynamically generated waveform data method to generate waveform, which can effectively improve the stability and reduce the distortion of the output waveform.

Balanced optical discriminator in an external gas-discharge cell

1975 ◽  
Vol 23 (3) ◽  
pp. 1188-1192
Author(s):  
A. L. Mel'tsin ◽  
V. V. Shchegolev
Keyword(s):  
Gas Discharge ◽  
Discharge Cell ◽  
Optical Discriminator

scholarly journals A Stability Criterion for a Radially Constricted Gas Discharge Between Electrodes

1961 ◽  
Vol 14 (3) ◽  
pp. 321
Author(s):  
PW Seymour
Keyword(s):  
Normal Mode ◽  
Thermodynamic Analysis ◽  
Stability Criterion ◽  
Integral Form ◽  
Gas Discharge ◽  
Plasma Stability ◽  
Sufficient Stability ◽  
Interchange Instability ◽  
The Stability ◽  
Energy Principles

The stability of a centrally constricted, highly ionized deuterium discharge between electrodes is considered. Initially, the normal mode and energy principles for the examination of plasma stability are reviewed and the results contrasted. Teller's powerful stability criterion is next obtained in a useful integral form by means of a thermodynamic analysis of interchange instability. This general geometrical result is then applied to the centrally constricted plasma between electrodes, and a sufficient stability criterion derived.

Open discussion

1982 ◽  
Vol 99 ◽  
pp. 605-613
Author(s):  
P. S. Conti
Keyword(s):  
Buenos Aires ◽  
Large Mass ◽  
List Type ◽  
Common Phenomenon ◽  
Open Discussion ◽  
The Stability ◽  
Ring Nebulae

Conti: One of the main conclusions of the Wolf-Rayet symposium in Buenos Aires was that Wolf-Rayet stars are evolutionary products of massive objects. Some questions:–Do hot helium-rich stars, that are not Wolf-Rayet stars, exist?–What about the stability of helium rich stars of large mass? We know a helium rich star of ∼40 MO. Has the stability something to do with the wind?–Ring nebulae and bubbles : this seems to be a much more common phenomenon than we thought of some years age.–What is the origin of the subtypes? This is important to find a possible matching of scenarios to subtypes.

Symmetric Multistep Methods Revisited: II. Numerical Experiments

1999 ◽  
Vol 173 ◽  
pp. 309-314 ◽  
Author(s):  
T. Fukushima
Keyword(s):  
Multistep Methods ◽  
Computational Time ◽  
Integration Time ◽  
Implicit Methods ◽  
Symmetric Methods ◽  
Celestial Bodies ◽  
The Stability ◽  
Predictor Corrector ◽  
Symmetric Multistep Methods ◽  
Integration Errors

AbstractBy using the stability condition and general formulas developed by Fukushima (1998 = Paper I) we discovered that, just as in the case of the explicit symmetric multistep methods (Quinlan and Tremaine, 1990), when integrating orbital motions of celestial bodies, the implicit symmetric multistep methods used in the predictor-corrector manner lead to integration errors in position which grow linearly with the integration time if the stepsizes adopted are sufficiently small and if the number of corrections is sufficiently large, say two or three. We confirmed also that the symmetric methods (explicit or implicit) would produce the stepsize-dependent instabilities/resonances, which was discovered by A. Toomre in 1991 and confirmed by G.D. Quinlan for some high order explicit methods. Although the implicit methods require twice or more computational time for the same stepsize than the explicit symmetric ones do, they seem to be preferable since they reduce these undesirable features significantly.

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