A study of the temperature variation effect in a steel sample for rapid analysis using LIBS

In IPEN’s Neutron Activation Laboratory (LAN/IPEN), thin stainless steel sample holders are used for gamma spectrometry in NAA measurements. This material is very practical, but its chemical composition may be troublesome, as it presents large amounts of elements with intermediate atomic number, with attenuation factors for low-energy gamma-rays that must not be neglected. In this study, count rates obtained using different sample holders were compared. To accomplish that, an Am-241 source, with 59-keV gamma emission, was used so that low-energy gamma attenuation differences can be determined. Moreover, in order to study the energy dependence of these differences, a Ho-166m source was also used. From these results, it was possible to analyze the experimental error associated to the variations between sample holders, with the aim of introducing an addictive term to the uncertainty analysis of comparative Neutron Activation Analysis results.

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Extension of Mathematical Models Taking Temperature Variation in Permanent Magnet Synchronous Motors into Consideration

IEEJ Transactions on Industry Applications ◽

10.1541/ieejias.136.263 ◽

2016 ◽

Vol 136 (4) ◽

pp. 263-269

Author(s):

Junnosuke Nakatsugawa ◽

Yoshitaka Iwaji ◽

Yuji Enomoto

Keyword(s):

Mathematical Models ◽

Permanent Magnet ◽

Temperature Variation ◽

Permanent Magnet Synchronous Motors ◽

Synchronous Motors

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Simulation of the internal temperature in the Passol Laboratory, University of Debrecen

International Review of Applied Sciences and Engineering ◽

10.1556/irase.3.2012.1.08 ◽

2012 ◽

Vol 3 (1) ◽

pp. 63-73 ◽

Cited By ~ 4

Author(s):

I. Csáky ◽

F. Kalmár

Keyword(s):

Temperature Variation ◽

Air Temperature ◽

Indoor Air ◽

Storage Capacity ◽

Building Structures ◽

Internal Temperature ◽

The One ◽

Heavy Structure ◽

East West ◽

Made In

Abstract Nowadays the facades of newly built buildings have significant glazed surfaces. The solar gains in these buildings can produce discomfort caused by direct solar radiation on the one hand and by the higher indoor air temperature on the other hand. The amplitude of the indoor air temperature variation depends on the glazed area, orientation of the facade and heat storage capacity of the building. This paper presents the results of a simulation, which were made in the Passol Laboratory of University of Debrecen in order to define the internal temperature variation. The simulation proved that the highest amplitudes of the internal temperature are obtained for East orientation of the facade. The upper acceptable limit of the internal air temperature is exceeded for each analyzed orientation: North, South, East, West. Comparing different building structures, according to the obtained results, in case of the heavy structure more cooling hours are obtained, but the energy consumption for cooling is lower.

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