Likely effects of standing and lying on the radiating heat load experienced by a resting kangaroo on a summer day

1972 ◽  
Vol 20 (1) ◽  
pp. 17 ◽  
Author(s):  
TJ Dawson
Keyword(s):  
Infrared Radiation ◽  
Heat Load ◽  
The Sun ◽  
Radiation Heat ◽  
Small Tree ◽  
Radiation Characteristics ◽  
Long Wave ◽  
Open Country ◽  
Effective Radiation ◽  
Long Wave Infrared

A study was carried out to examine the effect of posture (standing or lying) on the radiation heat load which would be experienced by a kangaroo resting under a small desert tree during a summer day. Measurements were made to assess the temperature and radiation characteristics in three situations judged to be equivalent to the following: (1) a kangaroo standing in the sun in open country; (2) an animal standing in the shade of a small tree; (3) an animal lying in the same shade. The overall pattern of results was shown by the effective radiation temperature measurements made at midday: 78.3, 57.6, and 52.5C for positions (I), (2), and (3) respectively. The relative contributions of solar and long-wave infrared radiation to the pattern of results are discussed.

Impact of Background Radiation on the Long Wave Infrared Radiation Characteristics of Aircraft at High Altitude

2016 ◽  
Vol 66 (1) ◽  
pp. 51 ◽  
Author(s):  
Wei Huang ◽  
Hong-hu Ji
Keyword(s):  
Infrared Radiation ◽  
Horizontal Plane ◽  
Background Radiation ◽  
Reverse Monte Carlo ◽  
Radiance Temperature ◽  
Radiation Characteristics ◽  
Long Wave ◽  
The Impact ◽  
Long Wave Infrared ◽  
Tracing Method

<p class="maintext">Reflected background infrared radiation is an important contributor to the aircraft total infrared radiation. A reverse Monte Carlo ray tracing method to compute the infrared radiation signature of aircraft was introduced. The impact of atmospheric and ground radiation on the long wave infrared radiation signature of aircraft at the altitude of 11 km is analysed. The flight speed is Mach 0.8. The horizontal detection directions, downward detection directions and upward detection directions are considered. The results show that in the horizontal plane, the ratio of reflected background infrared radiation to self infrared radiation is about 10 per cent in summer, and 7 per cent in winter; the ratio values distributed in the front and side of the aircraft are bigger than that in the rear; and the existence of atmospheric and ground infrared radiation makes the apparent radiance temperature of the lower part of the aircraft higher than that of the upper part of the aircraft.</p><p class="maintext"><strong>Defence Science Journal, Vol. 66, No. 1, January 2016, pp. 51-56, DOI: http://dx.doi.org/10.14429/dsj.66.8090</strong></p>

The heat balance of sheep standing in the sun

1957 ◽  
Vol 8 (3) ◽  
pp. 271 ◽  
Author(s):  
CHB Priestley
Keyword(s):  
Heat Balance ◽  
Heat Load ◽  
The Body ◽  
Wave Radiation ◽  
The Sun ◽  
Convective Heat Loss ◽  
Radiation Exchange ◽  
Long Wave ◽  
The Heat Balance ◽  
Long Wave Radiation

An extension is made of Lee's (1950) original discussion of the heat balance of sheep exposed to a tropical sun. Methods are given for calculating the two quantities, convective heat loss and long-wave radiation exchange, which automatically compensate to a large extent for the added heat load. There appear to be advantages in distinguishing between the heat balance of the fleece and that of the body of the sheep, and this provides a method of estimating the heat conducted to the body as a consequence of the insolation.

Infrared Reflective Coatings for Window Glazing

2008 ◽  
Vol 144 ◽  
pp. 226-231 ◽  
Author(s):  
Jitka Mohelníková
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Infrared Radiation ◽  
Spectral Characteristics ◽  
Heat Losses ◽  
Glass Pane ◽  
Thin Film Coatings ◽  
Long Wave ◽  
Reflective Coatings ◽  
Long Wave Infrared

Glasses reflective in the spectral range of long-wave infrared radiation operate as heat mirrors. These glasses have found wide applications in architecture. Special thin film coatings on glass panes reflect long wave infrared radiation back to building interiors. The reflective thin films limit absorption of infrared radiation within the glass pane and reduce radiation heat losses of glazings. Heat losses of windows could be significantly limited with the coated glasses which are called low-emissivity glazings. The study of materials convenient for infrared reflective coatings, the optimal composition of thin films and their thicknesses is the main topic of the presented paper. The study is based on measurements of spectral characteristics of selected glasses and computer simulations of the thin film composition for applications of window infrared reflective coatings.

scholarly journals Upconversion detection of long-wave infrared radiation from a quantum cascade laser

2018 ◽  
Vol 8 (5) ◽  
pp. 1313 ◽  
Author(s):  
Yu-Pei Tseng ◽  
Christian Pedersen ◽  
Peter Tidemand-Lichtenberg
Keyword(s):  
Quantum Cascade Laser ◽  
Infrared Radiation ◽  
Quantum Cascade ◽  
Long Wave ◽  
Long Wave Infrared

scholarly journals New Trends in Energy Harvesting from Earth Long-Wave Infrared Emission

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Luciano Mescia ◽  
Alessandro Massaro
Keyword(s):  
System Design ◽  
Thermal Energy ◽  
Infrared Emission ◽  
Design Guidelines ◽  
The Sun ◽  
Design Considerations ◽  
The Earth ◽  
Long Wave ◽  
Long Wave Infrared

A review, even if not exhaustive, on the current technologies able to harvest energy from Earth’s thermal infrared emission is reported. In particular, we discuss the role of the rectenna system on transforming the thermal energy, provided by the Sun and reemitted from the Earth, in electricity. The operating principles, efficiency limits, system design considerations, and possible technological implementations are illustrated. Peculiar features of THz and IR antennas, such as physical properties and antenna parameters, are provided. Moreover, some design guidelines for isolated antenna, rectifying diode, and antenna coupled to rectifying diode are exploited.

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