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Farda A. Imanov, Asger S. Mammadov and Naila I. Hasanova

Abstract

As part of the World Food Program, investigating droughts is within the scope of our interest. Therefore, this paper presents results of studies on droughts in one of the most important economic regions of Azerbaijan. There are different methods to investigate drought. As chosen region is characterised by large precipitation, we preferred to use the SPI method to carry on our study. During the research, dry years were determined according to the seasonal and annual data from weather stations in the province.

Open access

S.H. Jabarov, V.B. Aliyeva, T.G. Mammadov, A.I. Mammadov, S.E. Kichanov, L.S. Dubrovinsky, S.S. Babayev, E.G. Pashayeva and N.T. Dang

Abstract

Raman spectroscopy measurements of a monoclinic layered semiconductor TlGaSe2were performed in a pressure range up to 10.24 GPa. The pressure-induced first-order phase transition accompanied by reconstruction of the layer structure was observed at the pressure P ~ 0.9 GPa. The mode-Grüneisen parameters of intralayer bonds were calculated for TlGaSe2. The contribution of thermal expansion to temperature changes of phonon frequencies was defined. The type of intralayer bonds and their pressure transformation were analyzed in layered TlGaSe2. It was shown that the nature of intramolecular forces in molecular crystals and intralayer forces in layered GaS, GaSe and TlGaSe2is similar