Vol. 43 No. 3 (220) (2009)

Dielectric permittivity  (ε=ε՛–iε՛՛)  of the natural, modified and irradiated zeolite is measured depending on frequency of a variable electrical field. It has been carried out that dielectric permittivity and dielectric losses factor of Ba²⁺ modified zeolite depending on electric field frequency monotonously decreases. With increase of a doze of an irradiation up to 10¹⁵ el/cm² the maximum of dielectric parameter is observed, and at a doze of 3‧10¹⁶ el/cm² this parameter strongly decreases. It is supposed, that such behaviour of tanδ is connected with occurring structural changes in the elementary cell of zeolite at introduction of ions Ba²⁺ and irradiation.

In this article the results of laboratory tests of samples of two optimum mixes to shear and creeping strength are presented. In an optimum mix the clay components are presented by swelling bentonite clays of Sarigukh deposit and Miocene reddish clays of Erebuni. As additive compound in optimum mixes dust of volcanic tuff and slag was used. It is established, that in optimum mixes the presence of volcanic tuff and slag leads to cohesion decrease and internal friction increase.

Based on the nature exploration and hydrogeological calculations on the subsurface water deposits located in the south part of Trinidad City and Caribbean Sea (Republic of Cuba), it has been chosen an exploitation section of sweet sub-surface waters. On this section with the chosen scheme of distribution of water-proof buildings (boreholes), it is possible to pump out more quantities of needed water (100 L per second) for the Trinidad City and the tourist center located near the city. By the way according to the mentioned calculations the mineralization of the pumped out water during the exploitation period (30 years) will remain in allowed limits.

Influence of landslides of Armenia on transport communications and populated areas is examined; examples and sizes of areas in separate regions of the republic liable to landslide and districts, which are in the most critical situation, are selected. The conclusion that large damage of the territory of Armenia is the result of incorrect economic activity of the man on the whole and absence of preventive anti-landslide measures is drawn. The necessity of forming a joint scientific centre for research of landslides is marked.

In this article the variability of air temperature and precipitation in Ararat Valley based on the 1948–2007 observation data for Artashat meteorological station has been analyzed. The trends of seasonal and annual air temperature and precipitation have been constructed and their statistical significance has been estimated. The interannual variability of air temperature in Armenia (13 meteorological stations) has been studied and the correlation of global air temperature and air temperature over Armenia has been estimated. For a quantitative estimation of the correlation the simple linear regression between average seasonal and annual air temperatures of the stations and corresponding global temperatures has been established. The fluctuations of surface air temperature in Armenia are revealed.

The serpentinite is interesting for containing 12–14 weight% of crystal water and is applicable as a filler for the concrete of nuclear reactors. Such a concrete differs by high water content, the most part of which preserves at temperature up to 450℃ during a long work with the concrete. In Armenia the reserves of the serpentinite are connected with ultrabasic rocks of two ophiolitic ranges and are practically inexhaustible. Taking into account the last statement, we suggest to use Armenian serpentinite in protection system of Armenian nuclear reactor.