scholarly journals Performance Test of a Metal Insulated HTS Magnet with Conduction Cooling

2017 ◽  
Vol 871 ◽  
pp. 012086 ◽  
Author(s):  
J Choi ◽  
C S Hwang ◽  
C K Lee ◽  
S K Kim ◽  
M Park ◽  
...  
Keyword(s):  
Performance Test ◽  
Conduction Cooling ◽  
Hts Magnet

Operating Characteristics of an Insulationless HTS Magnet Under the Conduction Cooling Condition

2013 ◽  
Vol 23 (3) ◽  
pp. 4601504-4601504 ◽  
Author(s):  
Kwangmin Kim ◽  
Sung-Jun Jung ◽  
Hae-Jin Sung ◽  
Gyeong-Hun Kim ◽  
Seokho Kim ◽  
...  
Keyword(s):  
Cooling Condition ◽  
Operating Characteristics ◽  
Conduction Cooling ◽  
Hts Magnet

scholarly journals “Thermal Eraser” to Mitigate Screening Current by Optimal Control on Spatial Temperature Distribution in a High Temperature Superconductor Magnet

2021 ◽  
Author(s):  
Jeseok Bang ◽  
Jaemin Kim ◽  
Jung Tae Lee ◽  
Geonyoung Kim ◽  
Jeonghwan Park ◽  
...  
Keyword(s):  
High Temperature ◽  
Temperature Distribution ◽  
High Temperature Superconductor ◽  
Electric Heater ◽  
Temperature Dependent ◽  
Spatial Temperature Distribution ◽  
Induced Field ◽  
Conduction Cooling ◽  
Hts Magnet ◽  
Spatial Temperature

Abstract The so-called “screening current” in high temperature superconductor (HTS) is a well-known phenomenon that has detrimental effects on performance of an HTS magnet. To date, many research efforts have been devoted to suppressing screening current in an HTS magnet. Here we report a customized electric-heater, named “Thermal Eraser”, to mitigate the screening current. The key idea is to optimally control spatial temperature distribution in an HTS magnet using the customized heater and the consequent temperature-dependent local critical current of HTS wires of the magnet. To validate the idea, a Thermal Eraser was designed, constructed, and installed in an actual single-pancake HTS coil. And the Thermal Eraser plus test coil system was operated at temperatures ranging 7-40 K in our in-house conduction-cooling cryogenic facility. The feasibility of the Thermal Eraser was demonstrated in terms of two aspects: 1) creation of the designated spatial temperature distribution within the HTS test coil as designed; and 2) quantitative evaluation of its effectiveness to mitigate screening current using both experimental and numerical results. We confirmed that the screening current induced field in the test coil was reduced by 0.6 mT after activation of the Thermal Eraser, which implies 60% reduction of screening current in the HTS test coil. The results demonstrate that the Thermal Eraser is a viable option to effectively reduce the screening current in an HTS magnet.

scholarly journals Design and Performance Test of an HTS Magnet for 1 MW HTS DC Induction Heater

2020 ◽  
Vol 768 ◽  
pp. 022054
Author(s):  
Lei Hu ◽  
Shaotao Dai ◽  
Xufeng Yan ◽  
Tao Ma ◽  
Teng Zhang ◽  
...  
Keyword(s):  
Performance Test ◽  
Induction Heater ◽  
And Performance ◽  
Hts Magnet

Design and Operational Test of Large-sized HTS Magnets with Conduction Cooling System for a 300 kW-class Superconducting Induction Heater

MRS Advances ◽  
2018 ◽  
Vol 3 (54) ◽  
pp. 3189-3200 ◽  
Author(s):  
Jongho Choi ◽  
S. K. Kim ◽  
Sangho Cho ◽  
Minwon Park ◽  
In-Keun Yu
Keyword(s):  
Cooling System ◽  
Critical Currents ◽  
Magnetic Flux Density ◽  
Characteristic Analysis ◽  
Induction Heater ◽  
Operational Test ◽  
Angular Dependency ◽  
Conduction Cooling ◽  
Method Analysis ◽  
Hts Magnet

AbstractIn this paper, we presented design specifications and operational test results of large-sized high temperature superconducting (HTS) magnets for Superconducting Induction Heater (SIH). HTS magnets were designed and fabricated with the metal insulation method. Critical currents of the HTS magnets were estimated by considering the angular dependency on the magnetic flux density of HTS tape. The characteristic resistance, the charging and discharging time were calculated and measured in the liquid nitrogen and the conduction cooling condition achieved with the 2nd stage GM cryo-cooler. The saturated temperature of the HTS magnet reached at 5.6 K. The performances of the large-sized HTS magnet including cooling and magnetic field characteristics were tested under the conduction cooling. These results were evaluated with those of finite element method analysis results. The characteristic analysis results of the large-sized HTS magnets will be applied for development of the commercial 300 kW SIH.

Optimization of Thermal Structure of Conduction Cooling HTS Magnet

2015 ◽  
Vol 723 ◽  
pp. 988-991
Author(s):  
Xiang Li ◽  
Gang Wu ◽  
Ke Bi ◽  
Yan Fei Li ◽  
Zhi Yin Tang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Structure ◽  
Simulation Method ◽  
Heat Transfer Process ◽  
Structure Design ◽  
Maximum Temperature ◽  
Maximum Temperature Difference ◽  
Conduction Model ◽  
Conduction Cooling ◽  
Hts Magnet

According to the structure feature of HTS magnet, heat transfer process in steady-state conditions is analyzed, and the heat conduction model of magnet unit was established. The thermal structure of conduction cooling HTS magnet was optimized to minimize the maximum temperature difference of magnet unit, and the optimization result was verified with simulation method. Simulation results show the optimization method mentioned in this paper is effective, which can provide a guidance to heat transfer structure design.

Can Behavioral Speech-In-Noise Tests Improve the Quality of Hearing Aid Fittings?

2011 ◽  
Vol 7 (1) ◽  
pp. 8-14
Author(s):  
Robert Moore ◽  
Susan Gordon-Hickey
Keyword(s):  
Working Memory ◽  
Speech Perception ◽  
Performance Test ◽  
Hearing Aid ◽  
Speech Perception In Noise ◽  
Speech In Noise ◽  
Acceptable Noise Level ◽  
Perceptual Performance ◽  
Noise Test

The purpose of this article is to propose 4 dimensions for consideration in hearing aid fittings and 4 tests to evaluate those dimensions. The 4 dimensions and tests are (a) working memory, evaluated by the Revised Speech Perception in Noise test (Bilger, Nuetzel, & Rabinowitz, 1984); (b) performance in noise, evaluated by the Quick Speech in Noise test (QSIN; Killion, Niquette, Gudmundsen, Revit, & Banerjee, 2004); (c) acceptance of noise, evaluated by the Acceptable Noise Level test (ANL; Nabelek, Tucker, & Letowski, 1991); and (d) performance versus perception, evaluated by the Perceptual–Performance test (PPT; Saunders & Cienkowski, 2002). The authors discuss the 4 dimensions and tests in the context of improving the quality of hearing aid fittings.

A new motor performance test in a prospective study on children with suspected myopathy

2006 ◽  
Vol 48 (09) ◽  
pp. 739 ◽  
Author(s):  
Willeke A van den Beld ◽  
Gitty AC van der Sanden ◽  
Ton Feuth ◽  
Anjo JWM Janssen ◽  
Rob CA Sengers ◽  
...  
Keyword(s):  
Prospective Study ◽  
Motor Performance ◽  
Performance Test ◽  
A Prospective Study

Contingent Negative Variation (CNV) bei Kindern mit hyperkinetischem Syndrom - eine experimentelle Untersuchung mittels des Continuous Performance Test (CPT)

2000 ◽  
Vol 28 (4) ◽  
pp. 239-246 ◽  
Author(s):  
K. Hennighausen ◽  
G. Schulte-Körne ◽  
A. Warnke ◽  
H. Remschmidt
Keyword(s):  
Contingent Negative Variation ◽  
Performance Test ◽  
Continuous Performance Test ◽  
Continuous Performance ◽  
Experimentelle Untersuchung

Zusammenfassung Fragestellung: Gibt es neurophysiologische Korrelate der Aufmerksamkeitsstörung beim hyperkinetischen Syndrom (HKS) und welche Bedeutung haben diese für die Ätiologie der Störung. Methodik: Selektive Aufmerksamkeitsprozesse wurden anhand des zweistufigen Continuous Performance Test (CPT) bei 18 Jungen mit hyperkinetischem Syndrom (HKS) untersucht und mit einer nach dem Alter parallelisierten Kontrollgruppe von 21 Jungen verglichen. Die Altersspanne der Stichprobe betrug 6 bis 12 Jahre. Parallel dazu wurden ereigniskorrelierte Potentiale (EKP) während des Tests an den Elektrodenpositionen Fz, Cz, Pz und Oz mit Referenz zu verbundenen Ohren abgeleitet. Ergebnisse: Im EKP nach dem präparatorischen Stimulus konnten zwei Komponenten der Contingent Negative Variation (CNV) mit unterschiedlicher topographischer Verteilung identifiziert werden (CNV-1: 600 bis 1100 ms und CNV-2: 1000 bis 1500 ms nach Stimulus). Die Stichproben unterschieden sich nicht auf der Verhaltensebene (Fehlerrate und Reaktionszeit). Signifikante Gruppenunterschiede ergaben sich hinsichtlich der Topographie der beiden CNV-Komponenten. Kinder mit HKS zeigten im Vergleich zu Kontrollkindern eine signifikant niedrigere CNV-1 über der frontalen und eine Tendenz zu stärkerer Negativierung (CNV-1 und CNV-2) über der occipitalen Elektrode. Schlussfolgerungen: Die Ergebnisse unterstützen die Hypothese einer Unterfunktion frontaler inhibitorischer Prozesse bei Kindern mit HKS.

Self-Report vs. Computerized Measures of Impulsivity as a Correlate of Suicidal Behavior

Crisis ◽  
2001 ◽  
Vol 22 (1) ◽  
pp. 27-31 ◽  
Author(s):  
Netta Horesh
Keyword(s):  
Suicidal Behavior ◽  
Attention Deficit Disorder ◽  
Impulse Control ◽  
Performance Test ◽  
Adolescent Suicide ◽  
Continuous Performance Test ◽  
Self Report ◽  
Suicide Attempters ◽  
Computerized Measures ◽  
Adolescent Suicide Attempters

Objectives: To compare the use of a self-report form of impulsivity versus a computerized test of impulsivity in the assessment of suicidal adolescent psychiatric inpatients. Methods: Sixty consecutive admissions to an adolescent in patient unit were examined. The severity of suicidal behavior was measured with the Childhood Suicide Potential Scale (CSPS), and impulse control was measured with the self report Plutchik Impulse Control Scale (ICS) and with the Test of Variables of Attention (TOVA), a continuous performance test (CPT). The TOVA is used to diagnose adolescents with attention deficit disorder. Results: There was a significant but low correlation between the two measures of impulsivity. Only the TOVA commission and omission errors differentiated between adolescent suicide attempters and nonattempters. Conclusions: Computerized measures of impulsivity may be a useful way to measure impulsivity in adolescent suicide attempters. Impulsivity appears to play a small role only in nondepressed suicidal adolescents, especially boys.

Comparing the Mathematics Continuous Performance Test With Other Measures of Tests of Attention

2016 ◽  
Vol 32 (4) ◽  
pp. 291-297 ◽  
Author(s):  
Dubi Lufi ◽  
Shachar Pan
Keyword(s):  
Performance Test ◽  
Continuous Performance Test ◽  
Clinical Population ◽  
Control Group ◽  
Continuous Performance ◽  
Adhd Assessment ◽  
Research Reporting ◽  
Hyperactivity Disorder ◽  
Continuous Performance Tests ◽  
Better Than

Abstract. Several studies have shown that Continuous Performance Tests (CPT) can diagnose Attention Deficit Hyperactivity Disorder (ADHD) better than other tests. Research reporting comparisons of two or more CPT-type tests is scarce. The purpose of the study was to compare the Mathematics Continuous Performance Test (MATH-CPT) with another CPT-type test (CPT II) and a questionnaire (the Brown Scale). The comparison was carried out by looking at correlations among subscales and checking the precision of detecting ADHD. Ninety-five high school and college students participated in the study, 41 with ADHD were the research group and 54 were the control group. The participants performed the two tests and answered the questionnaire. The results showed that the MATH-CPT correctly identified 74.50% of the participants of both groups as compared to the 71.60% of the CPT II. Correlations between the two CPT-type tests were moderate; however, they were similar to correlations found in other studies comparing similar tools. The MATH-CPT, final attention formula, showed significant correlations with the Brown scales, while the CPT II, confidence index associated with ADHD assessment, showed nonsignificant correlations with the questionnaire. The study indicated that MATH-CPT can be used with a clinical population of ADHD and for research purposes.

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