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Andriambololona R.,Institute National des science et Techniques Nucleaires INSTN Madagascar | Ranaivoson R.T.,Institute National des science et Techniques Nucleaires INSTN Madagascar | Hasimbola Damo Emile R.,Institute National des science et Techniques Nucleaires INSTN Madagascar | Rakotoson H.,Institute National des science et Techniques Nucleaires INSTN Madagascar
International Journal of Theoretical Physics | Year: 2017

This work intends to present a study on relations between a Lie algebra called dispersion operators algebra, linear canonical transformation and a phase space representation of quantum mechanics that we have introduced and studied in previous works. The paper begins with a brief recall of our previous works followed by the description of the dispersion operators algebra which is performed in the framework of the phase space representation. Then, linear canonical transformations are introduced and linked with this algebra. A multidimensional generalization of the obtained results is given. © 2017 Springer Science+Business Media New York


Rabesiranana N.,Institute National des science et Techniques Nucleaires INSTN Madagascar | Rasolonirina M.,Institute National des science et Techniques Nucleaires INSTN Madagascar | Solonjara A.F.,Institute National des science et Techniques Nucleaires INSTN Madagascar | Ravoson H.N.,Institute National des science et Techniques Nucleaires INSTN Madagascar | And 2 more authors.
Journal of Environmental Radioactivity | Year: 2016

Soil degradation processes affect more than one-third of the Malagasy territory and are considered as the major environmental threat impacting the natural resources of the island. This innovative study reports about a pioneer test and use of radio-isotopic techniques (i.e. Cs-137 and Pb-210ex) under Madagascar agroclimatic condition to evaluate soil erosion magnitude. This preliminary investigation has been conducted in a small agricultural field situated in the eastern central highland of Madagascar, 40 km East from Antananarivo. Both anthropogenic Cs-137 and geogenic Pb-210 soil tracers provided similar results highlighting soil erosion rates reaching locally 18 t ha-1 yr-1, a level almost two times higher than the sustainable soil loss rate under Madagascar agroclimatic condition. The sediment delivery ratio established with both radiotracers was above 80% indicating that most of the mobilized sediment exits the field. Assessing soil erosion rate through fallout radionuclides in Madagascar is a first step towards an efficient land and water resource management policy to optimise the effectiveness of future agricultural soil conservation practices. © 2015 Elsevier Ltd.


PubMed | International Atomic Energy Agency and Institute National des science et Techniques Nucleaires INSTN Madagascar
Type: | Journal: Journal of environmental radioactivity | Year: 2016

Soil degradation processes affect more than one-third of the Malagasy territory and are considered as the major environmental threat impacting the natural resources of the island. This innovative study reports about a pioneer test and use of radio-isotopic techniques (i.e. Cs-137 and Pb-210ex) under Madagascar agroclimatic condition to evaluate soil erosion magnitude. This preliminary investigation has been conducted in a small agricultural field situated in the eastern central highland of Madagascar, 40km East from Antananarivo. Both anthropogenic Cs-137 and geogenic Pb-210 soil tracers provided similar results highlighting soil erosion rates reaching locally 18tha(-1)yr(-1,) a level almost two times higher than the sustainable soil loss rate under Madagascar agroclimatic condition. The sediment delivery ratio established with both radiotracers was above 80% indicating that most of the mobilized sediment exits the field. Assessing soil erosion rate through fallout radionuclides in Madagascar is a first step towards an efficient land and water resource management policy to optimise the effectiveness of future agricultural soil conservation practices.

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