scholarly journals Influence of working pressure on the state of H2/C4H8 glowing discharge plasma

2013 ◽  
Vol 62 (5) ◽  
pp. 058104
Author(s):  
Li Rui ◽  
He Zhi-Bing ◽  
Yang Xiang-Dong ◽  
He Xiao-Shan ◽  
Niu Zhong-Cai ◽  
...  
Keyword(s):  
Discharge Plasma ◽  
The State ◽  
Working Pressure ◽  
Glowing Discharge

scholarly journals Influence of radio-frequency power on the state of H2/C4H8 glowing discharge plasma

2012 ◽  
Vol 61 (21) ◽  
pp. 215203
Author(s):  
Li Rui ◽  
He Zhi-Bing ◽  
He Xiao-Shan ◽  
Niu Zhong-Cai ◽  
Yang Xiang-Dong
Keyword(s):  
Radio Frequency ◽  
Discharge Plasma ◽  
The State ◽  
Radio Frequency Power ◽  
Glowing Discharge ◽  
Frequency Power

scholarly journals Performance of Hydrogen Storage Tanks of Type IV in a Fire: Effect of the State of Charge

Hydrogen ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 386-398
Author(s):  
Sergii Kashkarov ◽  
Dmitriy Makarov ◽  
Vladimir Molkov
Keyword(s):  
Hydrogen Storage ◽  
Safety Issue ◽  
Pressure Ratio ◽  
The State ◽  
State Of Charge ◽  
Thickness Variation ◽  
Storage Tanks ◽  
Working Pressure ◽  
Type Iv ◽  
Composite Wall

The use of hydrogen storage tanks at 100% of nominal working pressure (NWP) is expected only after refuelling. Driving between refuellings is characterised by the state of charge SoC <100%. There is experimental evidence that Type IV tanks tested in a fire at initial pressures below 1/3 NWP, leaked without rupture. This paper aims at understanding this phenomenon. The numerical research has demonstrated that the heat transfer from fire through the composite overwrap at storage pressures below NWP/3 is sufficient to melt the polymer liner. This melting initiates hydrogen microleaks through the composite before it loses the load-bearing ability. The fire-resistance rating (FRR) is defined as the time to rupture in a fire of a tank without or with blocked thermally activated pressure relief device. The dependence of a FRR on the SoC is demonstrated for the tanks with defined material properties and volumes in the range of 36–244 L. A composite wall thickness variation is shown to cause a safety issue by reducing the tank’s FRR and is suggested to be addressed by tank manufacturers and OEMs. The effect of a tank’s burst pressure ratio on the FRR is investigated. Thermal parameters of the composite wall, i.e., decomposition heat and temperatures, are shown in simulations of a tank failure in a fire to play an important role in its FRR.

scholarly journals A Comparative Study on the Electrical Characteristics of Generating Plasma by Using Different Target Sources

2018 ◽  
Vol 15 (4) ◽  
pp. 436-440 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Glow Discharge ◽  
Work Function ◽  
Discharge Current ◽  
Discharge Plasma ◽  
Glow Discharge Plasma ◽  
Electrical Characteristics ◽  
Working Pressure ◽  
Dc Power ◽  
In The Beginning ◽  
Discharge Potential

In this research, the electrical characteristics of glow discharge plasma were studied. Glow discharge plasma generated in a home-made DC magnetron sputtering system, and a DC-power supply of high voltage as input to the discharge electrodes were both utilized. The distance between two electrodes is 4cm. The gas used to produce plasma is argon gas which flows inside the chamber at a rate of 40 sccm. The influence of work function for different target materials (gold, copper, and silver), - 5cm in diameter and around 1mm thickness - different working pressures, and different applied voltages on electrical characteristics (discharge current, discharge potential, and Paschen’s curve) were studied. The results showed that the discharge current and potential increase by increasing the applied voltage ranging between 300-700 V. Discharge current increased as working pressure increased in the beginning, and then semi-stabilized (slight increase) starting from 1×100 mbar, while discharge potential decreased at the beginning as working pressure increased and then semi-stabilized at the same point at which discharge current stabilized. The Paschen’s curves were compared with each other. It was concluded that the lower breakdown voltage was associated with lower work function of the (Au, Cu, and Ag) cathode material. Breakdown voltages were (395, 398, and 420) for Ag, Cu and Au respectively.

Practical Picture Processing

1974 ◽  
Vol 32 ◽  
pp. 338-339
Author(s):  
T. A. Welton
Keyword(s):  
Radiation Damage ◽  
Coherence Length ◽  
Spatial Information ◽  
State Of The Art ◽  
Coherent Radiation ◽  
The State ◽  
Energy Spread ◽  
Electron Micrograph ◽  
Picture Processing ◽  
Molecular Skeleton

Various authors have emphasized the spatial information resident in an electron micrograph taken with adequately coherent radiation. In view of the completion of at least one such instrument, this opportunity is taken to summarize the state of the art of processing such micrographs. We use the usual symbols for the aberration coefficients, and supplement these with £ and 6 for the transverse coherence length and the fractional energy spread respectively. He also assume a weak, biologically interesting sample, with principal interest lying in the molecular skeleton remaining after obvious hydrogen loss and other radiation damage has occurred.

Pragmatic versus Morphological/Syntactic Criteria for Language Referrals

1980 ◽  
Vol 11 (2) ◽  
pp. 85-94 ◽  
Author(s):  
Jack Damico ◽  
John W. Oller
Keyword(s):  
Grade Level ◽  
The State ◽  
Verb Agreement ◽  
Remedial Programs ◽  
Service Training ◽  
Traditional Approaches ◽  
Communicative Effectiveness

Two methods of identifying language disordered children are examined. Traditional approaches require attention to relatively superficial morphological and surface syntactic criteria, such as, noun-verb agreement, tense marking, pluralization. More recently, however, language testers and others have turned to pragmatic criteria focussing on deeper aspects of meaning and communicative effectiveness, such as, general fluency, topic maintenance, specificity of referring terms. In this study, 54 regular K-5 teachers in two Albuquerque schools serving 1212 children were assigned on a roughly matched basis to one of two groups. Group S received in-service training using traditional surface criteria for referrals, while Group P received similar in-service training with pragmatic criteria. All referrals from both groups were reevaluated by a panel of judges following the state determined procedures for assignment to remedial programs. Teachers who were taught to use pragmatic criteria in identifying language disordered children identified significantly more children and were more often correct in their identification than teachers taught to use syntactic criteria. Both groups identified significantly fewer children as the grade level increased.

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