scholarly journals Comparative analysis of isothermal decay of the surface potential of fluoroethylenepropylene electrets and of the sensitivity of electret microphones at elevated temperature

AIP Advances ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 095313
Author(s):  
André Gerlach ◽  
Marko Liebler ◽  
Gerhard M. Sessler ◽  
Heinz von Seggern ◽  
Bernd Scheufele ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Elevated Temperature ◽  
Surface Potential ◽  
Isothermal Decay

scholarly journals CALCULATION OF SAFETY INDEX FOR FOREIGN ORIGIN ELECTRONIC COMPONENTS

2020 ◽  
Vol 62 (4) ◽  
pp. 33-37
Author(s):  
Liliia I. Suleimanova ◽  
◽  
Tatiana I. Davydova ◽  
Keyword(s):  
Activation Energy ◽  
Comparative Analysis ◽  
Elevated Temperature ◽  
Mathematical Models ◽  
Chemical Processes ◽  
Safety Index ◽  
Electronic Components ◽  
Foreign Origin ◽  
Periodic Monitoring ◽  
Physical And Chemical

The article deals with problems arising from the use of foreign origin electronic components, being off the line in standby (storage) mode during operation with periodic monitoring of their operability, as well as with possible ways to solve these problems. It proposes the method of assessing the safety index based on determining the characteristics of foreign origin electronic components for the standby (storage) mode. The method is implemented using mathematical models with the activation energy of physical and chemical processes of electronic components degradation. The use of mathematical models to solve the problem may allow forecasting the reliability of products in the most efficient way. The authors give calculations and comparative analysis of the minimum service life (minimum shelf life) at an elevated temperature for several groups of foreign origin electronic components and for several models of external influencing factors.

Evidence for a shear mechanism for the precipitation of γ-zirconium hydride in zirconium

1978 ◽  
Vol 36 (1) ◽  
pp. 658-659
Author(s):  
G.J.C. Carpenter
Keyword(s):  
Elevated Temperature ◽  
Strain Field ◽  
Zirconium Hydride ◽  
Zirconium Atom ◽  
Atom Diffusion ◽  
Solvus Temperature ◽  
Hexagonal Close Packed ◽  
Partial Dislocations ◽  
The Face

In zirconium-hydrogen alloys, rapid cooling from an elevated temperature causes precipitation of the face-centred tetragonal (fct) phase, γZrH, in the form of needles, parallel to the close-packed <1120>zr directions (1). With low hydrogen concentrations, the hydride solvus is sufficiently low that zirconium atom diffusion cannot occur. For example, with 6 μg/g hydrogen, the solvus temperature is approximately 370 K (2), at which only the hydrogen diffuses readily. Shears are therefore necessary to produce the crystallographic transformation from hexagonal close-packed (hep) zirconium to fct hydride.The simplest mechanism for the transformation is the passage of Shockley partial dislocations having Burgers vectors (b) of the type 1/3<0110> on every second (0001)Zr plane. If the partial dislocations are in the form of loops with the same b, the crosssection of a hydride precipitate will be as shown in fig.1. A consequence of this type of transformation is that a cumulative shear, S, is produced that leads to a strain field in the surrounding zirconium matrix, as illustrated in fig.2a.

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