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Distribution of stem decay in the beech trees of the Azerbaijan and its impact on the output of commercial wood

Journal of Forestry Research 2019年第3期30卷 1023-1028页

作者： A.B.Yakhyaev V.S.Farzaliyev e.p.safarova Azerbaijan University of Architecture and Construction Mammad Rahim StreetBaku City 1004Azerbaijan Republic Central Botanical Garden of Azerbaijan National Academy of Sciences Mikayil Mushfig 103Baku City 1004 Azerbaijan Republic

To determine the distribution of stem decay in the beech stands of Azerbaijan, we sought to identify the species, number, and height of attachment of fruiting bodies;the extent of decay in tree trunks growing under different conditions;and its influence on the trees’ commercial wood. The research was conducted on three farms representing the most common forest types of the Greater Caucasus within Azerbaijan. examination of the presence of fruiting bodies in the tree trunk revealed that stem decay is the most common infection in beech (Fagus orientalis) stands, especially in fresh, moist areas, with less infection under dry growing conditions. In this work, the length, diameter, and volume of decay were studied by infecting the trunks of 93 model trees affected with mushrooms in 1–4 m cuttings. Our results showed that as the age of the stand increased, extent, diameter, and volume of decay increased significantly: the extent of decay from 1.47 to 6.43 m;the diameter of the decay from 8.15 to 32.7 cm;and the volume of decay from 2.5 to 13.2%. The relationship between age and the specified indicators is presented graphically. Using data obtained from the same sample of trees, we determined the expected and actual yield of commercial wood by age class. We determined that stem decay in beech stands leads to a decrease in the yield of commercial wood on average from 25.1% in the middle-aged to 14.8% in overmature plantations, respectively, with an estimated yield of 40.8–62.7%. Here we present mathematical models of the output of commercial wood from the infected part of the stands by age classes with the use of average data on the extent of decay in model trees.

关键词： Beech Wood Infection Forest type Stem decay Output of commercial wood Fruiting bodies

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effect of Aluminum Nano-particles on Microrelief and Dielectric properties of pe+TlInSe<sub>2</sub>Composite Materials

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Open Journal of Inorganic Non 2015年第1期5卷 11-19页

作者： e. M. Gojayev Kh. R. Ahmadova S. I. safarova G. S. Djafarova Sh. M. Mextiyeva Azerbaijan Technical University Baku Azerbaijan

The paper presents the results of studies surface microrelief, frequency-temperature characteristics of the imaginary part of the dielectric permittivity and dielectric loss of pe+TlInSe2 composite materials in 25。C - 150。C temperature and 25 Hz - 1 MHz frequency range before and after application of the aluminum nano-particles with a size of 50 nm. The change in the amount of semicon-ductor filler TlInSe2 and aluminum nano-particles changes the state of the surface and the frequency-temperature characteristics of composite materials pe+xvol.%TlInSe2, which allows to obtain composites with the desired dielectric permittivity and dielectric loss.

关键词： Surface Microrelief Aluminum Nano-particles Dielectric permeability Tangent of the Angle Dielectric Loss

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