Scientific Research Publishing

Read full pape at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=47481#.VFm6fGfHRK0 Author(s)     Adam Martin , Lucius Akalanne Affiliation(s) Wireless R&D, Alcatel Lucent, Swindon, United Kingdom . Wireless R&D, Alcatel Lucent, Swindon, United Kingdom . ABSTRACT Passive cooling techniques are cost effective and reliable methods of cooling remote radio heads (RRH). This paper investigates the plausibility of a passive cooling technique involving exchanging warm air, from the internal cavity of RRHs, with fresh ambient air, to reduce the operating temperature using natural convection across air filters. The results indicate that, an internal air filter tube structure, with widt...

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=50222#.VDIRI1fHRK0 Author(s)     Abdelhamid Belghit 1* , Mustapha Benyaich 2 Affiliation(s) 1 Laboratory of Engineering Science for Environment—LaSIE FRE-CNRS 3474, University of La Rochelle, La Rochelle, France . 2 Department of Physics, Faculty of Science, University Cadi Ayyad, Marrakesh, Morocco . ABSTRACT Penetration of chemicals in the soil ground through irrigation water or rainfall induces important risks for the environment. These risks are badly known and may lead to direct contamination of the environment (atmosphere or ground water) or harmful effects on organisms living at ground level, indirectly affecting men. It is thus necessary to estim...