scholarly journals Design and Experimental Evaluation of Quadrature Oscillator Employing Single FB–VDBA

2016 ◽  
Vol 67 (2) ◽  
pp. 137-142 ◽  
Author(s):  
Abdullah Yesil ◽  
Firat Kacar ◽  
Koray Gurkan
Keyword(s):  
Experimental Evaluation ◽  
Active Element ◽  
Current Drive ◽  
Experimental Results ◽  
High Current ◽  
Output Impedance ◽  
Quadrature Oscillator ◽  
Theoretical Assumptions ◽  
Circuit Structure ◽  
Buffer Amplifier

Abstract This paper presents an attractive and a new voltage-mode quadrature oscillator using a single Fully Balanced-Voltage Differencing Buffer Amplifier (FB-VDBA) as the active element. The circuit structure is very simple, consisting of merely one FB-VDBA, one resistor and two capacitors. The circuit is implemented using the commonly available OPA860 which results in low output impedance and high current drive capability. The proposed circuit also has a suitable architecture for IC production. Experimental results which are matched well with the theoretical assumptions are given.

scholarly journals Quadrature Oscillators Using Operational Amplifiers

2011 ◽  
Vol 2011 ◽  
pp. 1-4 ◽  
Author(s):  
Jiun-Wei Horng
Keyword(s):  
Phase Difference ◽  
Current Drive ◽  
Experimental Results ◽  
Operational Amplifiers ◽  
High Current ◽  
Output Impedance ◽  
Third Order ◽  
Oscillation Frequencies ◽  
Quadrature Oscillators ◽  
Circuit Configuration

Two new quadrature oscillator circuits using operational amplifiers are presented. Outputs of two sinusoidal signals with 90° phase difference are available in each circuit configuration. Both proposed quadrature oscillators are based on third-order characteristic equations. The oscillation conditions and oscillation frequencies of the proposed quadrature oscillators are orthogonally controllable. The circuits are implemented using the widely available operational amplifiers which results in low output impedance and high current drive capability. Experimental results are included.

Galvanostatic dissolution of mercury from the surface of glassy carbon into thiocyanate solution

1980 ◽  
Vol 45 (1) ◽  
pp. 169-178 ◽  
Author(s):  
František Opekar ◽  
Karel Holub
Keyword(s):  
Glassy Carbon ◽  
Electrode Surface ◽  
High Current Density ◽  
High Current ◽  
Nernst Equation ◽  
Potential Oscillations ◽  
Thiocyanate Solution ◽  
Theoretical Assumptions ◽  
Solution Proceeds ◽  
Dissolution Current

The galvanostatic dissolution of mercury from the surface of glassy carbon into a thiocyanate solution proceeds in accord with theoretical assumptions, as manifested by the constant product of the dissolution current and transition time. Under certain relations between the amount of oxidised mercury and concentration of thiocyanate at the electrode surface, however, a small part of the mercury dissolves at more positive potentials than correspond to the Nernst equation. This dissolution can be accompanied by potential oscillations. The anomalous behaviour is elucidated by the concept about coverage of a certain part of mercury with a film of sparingly soluble compounds of SCN- ions with mercury. This film is formed at the end of the galvanostatic dissolution on certain places of the electrode surface covered with mercury droplets, where SCN- ions are much exhausted as a result of a high current density.

Experimental Evaluation of Glob-top Materials for use in Harsh Environments

2005 ◽  
Vol 2 (4) ◽  
pp. 253-268 ◽  
Author(s):  
Mats Lindgren ◽  
Ilja Belov ◽  
Peter Leisner
Keyword(s):  
Process Parameters ◽  
Experimental Evaluation ◽  
Experimental Results ◽  
Polymer Materials ◽  
Harsh Environments ◽  
Automotive Applications ◽  
Critical Material ◽  
Material Evaluation

This article presents results of experimental evaluation of glob-top materials for multi-chip-modules (MCM) in harsh environments. Material and process tests have been performed with the purpose to find a material which would fulfill the reliability requirements for use e.g. in military or automotive applications. Seven polymer materials, i.e. four epoxies, two silicones and one polyurethane material have been selected and evaluated in the experiments. The most critical material and process parameters for glob-top have been identified and measured. Based on the experimental results, application-based scoring of studied epoxy materials has been performed. Material evaluation results have been summarized in conclusions about the most suitable glob-top material for use in harsh environments.

scholarly journals EXPERIMENTAL RESULTS ON A PLANAR ARRAY OF PARASITIC DIPOLES FED BY ONE ACTIVE ELEMENT

2011 ◽  
Vol 113 ◽  
pp. 369-377 ◽  
Author(s):  
Marcos Alvarez Folgueiras ◽  
Juan Antonio Rodríguez-Gonzalez ◽  
Francisco Jose Ares-Pena
Keyword(s):  
Active Element ◽  
Experimental Results ◽  
Planar Array

Automatic term recognition based on statistics of compound nouns

Terminology ◽  
2000 ◽  
Vol 6 (2) ◽  
pp. 195-210 ◽  
Author(s):  
Hiroshi Nakagawa
Keyword(s):  
Experimental Evaluation ◽  
Extraction Method ◽  
Recognition Task ◽  
Experimental Results ◽  
Test Collection ◽  
Term Extraction ◽  
Academic Conference ◽  
Compound Nouns ◽  
Automatic Term Recognition ◽  
Technical Terms

The NTCIR1 TMREC group called for participation of the term recognition task which is a part of NTCIR1 held in 1999. As an activity of TMREC, they have provided us with the test collection of the term recognition task. The goal of this task is to automatically recognize and extract terms from the text corpus which consists of 1,870 abstracts gathered from the NACSIS Academic Conference Database. This article describes the term extraction method we have proposed to extract terms consisting of simple and compound nouns and the experimental evaluation of the proposed method with this NTCIR TMREC test collection. The basic idea of scoring a simple noun N of our term extraction method is to count how many nouns are conjoined with N to make compound nouns. Then we extend this score to measure the score of compound nouns because most of technical terms are compound nouns. Our method has a parameter to tune the degree of preference either for longer compound nouns or for shorter compound nouns. As for term candidates, in addition to noun sequences, we may add variations such as patterns of "A no B" that roughly means "B of A" or "A’ś B" and/or "A na B" where "A na" is an adjective. Experimental results of our method are promising, namely recall of 0.83, precision of 0.46 and F-value of 0.59 for exactly matched extracted terms when we take into account top scoring 16,000 extracted terms.

scholarly journals Study of off-axis current drive using EC top-launch in KSTAR

2019 ◽  
Vol 203 ◽  
pp. 02003
Author(s):  
Young-soon Bae
Keyword(s):  
Operation Research ◽  
Essential Element ◽  
Current Drive ◽  
Electron Trapping ◽  
Lower Hybrid ◽  
Low Density ◽  
Simulation Studies ◽  
High Current ◽  
High Efficient ◽  
Lower Hybrid Current Drive

The off-axis current drive using electron cyclotron (EC) wave is typically very low due to the low density and temperature and electron trapping effect when it is launched from outside midplane. However, the heating and current drive by EC wave is being regarded as a essential element as an off-axis current drive source together with lower hybrid current drive (LHCD) for advanced tokamak operation research in KSTAR in future. Therefore, the reliable and high efficient ECCD using top launch has been studied for two different launch schemes of down-shift and up-shift resonance with various EC frequencies which will be available in the future KSTAR ECRH system. The ray tracing (GENRAY) simulation studies show that a broad ECCD profile peaked off axis is obtained with a high current drive efficiency for both schemes. It is almost twice as high as that of the outside midplane launch for the fundamental O-mode EC wave.

High Current Drive in Ultra-Short Impact Ionization MOS (I-MOS) Devices

2006 ◽  
Author(s):  
C. Charbuillet ◽  
S. Monfray ◽  
E. Dubois ◽  
P. Bouillon ◽  
F. Judong ◽  
...  
Keyword(s):  
Impact Ionization ◽  
Current Drive ◽  
High Current ◽  
Mos Devices
Sign in / Sign up

Export Citation Format

Share Document