4 research outputs found
A New Approach to Measuring Tree-Ring Density Parameters
ΠΡΠ΅Π²Π΅ΡΠ½ΡΠ΅ ΠΊΠΎΠ»ΡΡΠ° ΡΠ²Π»ΡΡΡΡΡ ΠΎΠ΄Π½ΠΈΠΌΠΈ ΠΈΠ· Π½Π°ΠΈΠ±ΠΎΠ»Π΅Π΅ Π΄ΠΎΡΡΠΎΠ²Π΅ΡΠ½ΡΡ
ΠΈΡΡΠΎΡΠ½ΠΈΠΊΠΎΠ²
ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠΈ ΠΎΠ± ΡΡΠ»ΠΎΠ²ΠΈΡΡ
ΠΎΠΊΡΡΠΆΠ°ΡΡΠ΅ΠΉ ΡΡΠ΅Π΄Ρ ΠΈ ΠΊΠ»ΠΈΠΌΠ°ΡΠ° Π² ΠΏΡΠΎΡΠ»ΠΎΠΌ. Π Π΅Π½ΡΠ³Π΅Π½ΠΎΠ²ΡΠΊΠ°Ρ
Π΄Π΅Π½ΡΠΈΡΠΎΠΌΠ΅ΡΡΠΈΡ ΠΊΠ°ΠΊ ΠΎΠ΄ΠΈΠ½ ΠΈΠ· Π²Π°ΠΆΠ½Π΅ΠΉΡΠΈΡ
ΠΈΠ½ΡΡΡΡΠΌΠ΅Π½ΡΠΎΠ² Π΄Π΅Π½Π΄ΡΠΎΡΠΊΠΎΠ»ΠΎΠ³ΠΈΠΈ ΠΈ Π΄Π΅Π½Π΄ΡΠΎΠΊΠ»ΠΈΠΌΠ°ΡΠΎΠ»ΠΎΠ³ΠΈΠΈ
ΡΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎ ΡΠ°ΡΡΠΈΡΡΠ΅Ρ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΠΈ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ ΠΏΠΎ ΡΠ΅ΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΈΠΈ ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΠΏΡΠΈΡΠΎΠ΄Π½ΡΡ
ΠΏΡΠΎΡΠ΅ΡΡΠΎΠ². ΠΠ»Π°ΡΡΠΈΡΠ΅ΡΠΊΠΈΠΉ ΡΠ΅Π½ΡΠ³Π΅Π½ΠΎΠ²ΡΠΊΠΈΠΉ Π΄Π΅Π½ΡΠΈΡΠΎΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΈΠΉ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡ DENDRO 2003,
ΠΎΠ±Π»Π°Π΄Π°Ρ ΠΎΠ±ΡΠ΅ΠΏΡΠΈΠ·Π½Π°Π½Π½ΡΠΌΠΈ Π΄ΠΎΡΡΠΎΠΈΠ½ΡΡΠ²Π°ΠΌΠΈ, ΡΠ΅ΠΌ Π½Π΅ ΠΌΠ΅Π½Π΅Π΅ ΠΈΠΌΠ΅Π΅Ρ ΡΡΠ΄ ΡΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΡΡ
Π½Π΅Π΄ΠΎΡΡΠ°ΡΠΊΠΎΠ², ΡΠ°ΠΊΠΈΡ
ΠΊΠ°ΠΊ Π²ΡΡΠΎΠΊΠ°Ρ ΡΡΠΎΠΈΠΌΠΎΡΡΡ, Π³ΡΠΎΠΌΠΎΠ·Π΄ΠΊΠΎΡΡΡ, ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ ΡΠ΅Π½ΡΠ³Π΅Π½ΠΎΠ²ΡΠΊΠΈΡ
ΠΏΠ»ΡΠ½ΠΎΠΊ ΠΈ Ρ.Π΄., ΡΡΠΎ Π²ΡΠ½ΡΠΆΠ΄Π°Π΅Ρ ΠΈΡΠΊΠ°ΡΡ Π°Π»ΡΡΠ΅ΡΠ½Π°ΡΠΈΠ²Π½ΡΠ΅ ΠΏΡΡΠΈ ΡΠ°Π·Π²ΠΈΡΠΈΡ Π΄Π΅Π½ΡΠΈΡΠΎΠΌΠ΅ΡΡΠΈΠΈ Π³ΠΎΠ΄ΠΈΡΠ½ΡΡ
ΠΊΠΎΠ»Π΅Ρ. Π ΡΠ°Π±ΠΎΡΠ΅ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½ Π½ΠΎΠ²ΡΠΉ ΠΌΠ΅ΡΠΎΠ΄ΠΈΡΠ΅ΡΠΊΠΈΠΉ ΠΏΠΎΠ΄Ρ
ΠΎΠ΄ ΠΊ ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½ΠΈΡ ΠΏΡΠΎΡΠΈΠ»Ρ ΠΏΠ»ΠΎΡΠ½ΠΎΡΡΠΈ
Π³ΠΎΠ΄ΠΈΡΠ½ΡΡ
ΠΊΠΎΠ»Π΅Ρ Π΄Π΅ΡΠ΅Π²ΡΠ΅Π² ΠΈ ΠΏΠΎΡΡΡΠΎΠ΅Π½ΠΈΡ Ρ
ΡΠΎΠ½ΠΎΠ»ΠΎΠ³ΠΈΠΉ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠΎΠ² ΠΏΠ»ΠΎΡΠ½ΠΎΡΡΠΈ Π΄ΡΠ΅Π²Π΅ΡΠ½ΡΡ
ΠΊΠΎΠ»Π΅Ρ, ΠΎΡΠ½ΠΎΠ²Π°Π½Π½ΡΠΉ Π½Π° ΡΠ°Π·Π΄Π΅Π»Π΅Π½ΠΈΠΈ ΡΠΎΡΠ΅ΠΊ ΠΈΠ·ΠΎΠ±ΡΠ°ΠΆΠ΅Π½ΠΈΡ ΠΊΠ»Π΅ΡΠΎΡΠ½ΠΎΠΉ ΡΡΡΡΠΊΡΡΡΡ ΠΊΠΎΠ»Π΅Ρ ΠΏΠΎ ΠΈΡ
ΠΊΠΎΠ½ΡΡΠ°ΡΡΠ½ΠΎΡΡΠΈ, ΠΏΠΎΠ»ΡΡΠΈΠ²ΡΠΈΠΉ Π½Π°Π·Π²Π°Π½ΠΈΠ΅ ΠΏΠΈΠΊΡΠ΅Π»Ρ-ΠΊΠΎΠ½ΡΡΠ°ΡΡΠ½ΠΎΠΉ
Π΄Π΅Π½ΡΠΈΡΠΎΠΌΠ΅ΡΡΠΈΠΈ (Pixel Contrast
Densitometry, PiC densitometry). ΠΡΠΎΠ²Π΅Π΄Π΅Π½Π° ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½Π°Ρ Π°ΠΏΡΠΎΠ±Π°ΡΠΈΡ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠ°Π½Π½ΡΡ
ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ² PiC Π΄Π΅Π½ΡΠΈΡΠΎΠΌΠ΅ΡΡΠΈΠΈ ΠΏΡΠΈ ΠΏΠΎΠΌΠΎΡΠΈ Π΄Π΅ΠΌΠΎΠ½ΡΡΡΠ°ΡΠΎΡΠ°, ΡΠ΅Π°Π»ΠΈΠ·ΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ Π² Π²ΠΈΠ΄Π΅ ΠΏΡΠΎΠ³ΡΠ°ΠΌΠΌΠ½ΠΎΠ³ΠΎ
ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠ΅Π½ΠΈΡ, ΠΏΠΎΠ·Π²ΠΎΠ»ΡΡΡΠ΅Π³ΠΎ Π²ΡΠΏΠΎΠ»Π½ΡΡΡ ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½ΠΈΡ ΠΏΡΠΎΡΠΈΠ»Ρ ΠΏΠ»ΠΎΡΠ½ΠΎΡΡΠΈ Π³ΠΎΠ΄ΠΈΡΠ½ΡΡ
ΠΊΠΎΠ»Π΅Ρ
ΠΈ ΠΏΠΎΠ»ΡΡΠ°ΡΡ Ρ
ΡΠΎΠ½ΠΎΠ»ΠΎΠ³ΠΈΠΈ ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
Π΅Π³ΠΎ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠΎΠ². Π‘ΡΠ°Π²Π½ΠΈΡΠ΅Π»ΡΠ½ΡΠΉ Π°Π½Π°Π»ΠΈΠ· ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΎΠ²
ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½ΠΈΠΉ ΠΈ ΡΡΠ½ΠΊΡΠΈΠΎΠ½Π°Π»ΡΠ½ΡΡ
Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΡΠ΅Π½ΡΠ³Π΅Π½ΠΎΠ²ΡΠΊΠΎΠΉ ΠΈ PiC Π΄Π΅Π½ΡΠΈΡΠΎΠΌΠ΅ΡΡΠΈΠΈ ΠΏΠΎΠΊΠ°Π·Π°Π», ΡΡΠΎ
Π΄Π΅Π½ΡΠΈΡΠΎΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΈΠΉ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡ, ΠΏΠΎΡΡΡΠΎΠ΅Π½Π½ΡΠΉ Π½Π° Π±Π°Π·Π΅ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠ°Π½Π½ΡΡ
ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ² ΠΈ ΠΏΡΠΎΠ³ΡΠ°ΠΌΠΌΠ½ΠΎΠ³ΠΎ
ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠ΅Π½ΠΈΡ PiC Π΄Π΅Π½ΡΠΈΡΠΎΠΌΠ΅ΡΡΠΈΠΈ, ΠΏΠΎΠ·Π²ΠΎΠ»ΡΠ΅Ρ ΠΏΠΎΠ»ΡΡΠ°ΡΡ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ, ΠΈΠ΄Π΅Π½ΡΠΈΡΠ½ΡΠ΅ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠ°ΠΌ
ΡΠ΅Π½ΡΠ³Π΅Π½ΠΎΠ²ΡΠΊΠΎΠΉ Π΄Π΅Π½ΡΠΈΡΠΎΠΌΠ΅ΡΡΠΈΠΈ, ΠΎΠ±Π»Π°Π΄Π°Π΅Ρ Π±ΠΎΠ»ΡΡΠ΅ΠΉ ΡΡΠ½ΠΊΡΠΈΠΎΠ½Π°Π»ΡΠ½ΠΎΡΡΡΡ, ΠΌΠ΅Π½ΡΡΠ΅ΠΉ ΡΡΠΎΠΈΠΌΠΎΡΡΡΡ
ΠΈ ΡΠΏΠΎΡΠΎΠ±Π΅Π½ ΠΏΠΎΠ»Π½ΠΎΡΡΡΡ Π·Π°ΠΌΠ΅Π½ΠΈΡΡ ΡΠΎΠ±ΠΎΠΉ ΡΠ΅Π½ΡΠ³Π΅Π½ΠΎΠ²ΡΠΊΠΈΠΉ Π΄Π΅Π½ΡΠΈΡΠΎΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΈΠΉ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡ DENDRO
2003 Π² ΡΠΈΡΠΎΠΊΠΎΠΌ ΡΠΏΠ΅ΠΊΡΡΠ΅ Π΄Π΅Π½Π΄ΡΠΎΡΠΊΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΈ Π΄Π΅Π½Π΄ΡΠΎΠΊΠ»ΠΈΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉTree rings are the most reliable high-resolution proxy archive for past climate and environmental changes, and Xβray densitometry is an important tool, which significantly expands the possibilities of dendroecology and dendroclimatology. The classic Xβray densitometric laboratory DENDRO 2003 with all its advantages, however, has a number of drawbacks, such as its high price, installation size, requirement of Xβray films and experienced technical staff, etc., which forces one to look for alternatives. The paper presents a new methodological approach to measuring wood density, developing tree-ring density profiles, and constructing tree- ring density chronologies. The proposed method β contrast densitometry (PiC densitometry) β is based on the pixel contrast in a high- resolution image of ring structures. Initial experimental tests using a specially developed demonstrator showed the strength and functionality of our approach, which produced results comparable to those derived by the traditional Xβray DENDRO 2003 technique. This new methodology is capable of replacing traditional DENDRO 2003 applications in a wide range of dendroecological and dendroclimatic studie
Structural and Optical Properties of Silicon Carbide Powders Synthesized from Organosilane Using High-Temperature High-Pressure Method
The development of new strategies for the mass synthesis of SiC nanocrystals with high structure perfection and narrow particle size distribution remains in demand for high-tech applications. In this work, the size-controllable synthesis of the SiC 3C polytype, free of sp2 carbon, with high structure quality nanocrystals, was realized for the first time by the pyrolysis of organosilane C12H36Si6 at 8 GPa and temperatures up to 2000 Β°C. It is shown that the average particle size can be monotonically changed from ~2 nm to ~500 nm by increasing the synthesis temperature from 800 Β°C to 1400 Β°C. At higher temperatures, further enlargement of the crystals is impeded, which is consistent with the recrystallization mechanism driven by a decrease in the surface energy of the particles. The optical properties investigated by IR transmission spectroscopy, Raman scattering, and low-temperature photoluminescence provided information about the concentration and distribution of carriers in nanoparticles, as well as the dominant type of internal point defects. It is shown that changing the growth modes in combination with heat treatment enables control over not only the average crystal size, but also the LO phononβplasmon coupled modes in the crystals, which is of interest for applications related to IR photonics