168 research outputs found
Absolute quantum yield measurements of fluorescent proteins using a plasmonic nanocavity
One of the key photophysical properties of fluorescent proteins that is most difficult to measure is the quantum yield. It describes how efficiently a fluorophore converts absorbed light into fluorescence. Its measurement using conventional methods become particularly problematic when it is unknown how many of the proposedly fluorescent molecules of a sample are indeed fluorescent (for example due to incomplete maturation, or the presence of photophysical dark states). Here, we use a plasmonic nanocavity-based method to measure absolute quantum yield values of commonly used fluorescent proteins. The method is calibration-free, does not require knowledge about maturation or potential dark states, and works on minute amounts of sample. The insensitivity of the nanocavity-based method to the presence of non-luminescent species allowed us to measure precisely the quantum yield of photo-switchable proteins in their on-state and to analyze the origin of the residual fluorescence of protein ensembles switched to the dark state
Friction coefficient obtained using AFM as a criterion of changes in the surface properties after low-temperature plasma treatment
This research was supported by the grant of Belarussian Republican Foundation for Fundamental Research BRFFR No.F17-118
Π Π°ΡΡΠ΅Ρ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΡΡ ΠΌΠ΅Ρ Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΡ Ρ Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΠΏΠΎΠ΄ΡΠ°Π±ΠΎΡΠ°Π½Π½ΠΎΠ³ΠΎ ΠΌΠ°ΡΡΠΈΠ²Π° Π³ΠΎΡΠ½ΡΡ ΠΏΠΎΡΠΎΠ΄
An approach has been developed to construct functional expressions for calculating the effective mechanical characteristics of the undermined rock massif during its repeated mining, taking into account the disturbance of the different-type massif continuity and the time passed after the undermining. The approach was developed as applied to the conditions of the Starobin potash salt deposit. It is based on introducing special correction factors into the expressions for mechanical characteristics of the massif. At the same time, the state of the undermined massif area is considered in the continuum model approximation. It is shown that one of the most important factors to be considered when constructing the functional dependence for mechanical characteristics of the undermined layered massif is to take into account the mutual slippage of layers and their lamination related to it, because the strength characteristics such as bonding strength and internal friction coefficient mainly change when the massif is undermined. The algorithm for calculating the mechanical properties of the undermined massif proposes the use of correction factors that take into account the heterogeneity of the rock massif; lamination and slippage of the contacting layers; changes in the properties of the undermined massif with variation of the depth of repeated mining; changes in the properties resulting from the technological disturbance of the massif initial equilibrium state (primary undermining, time passed since the primary undermining).Π Π°Π·ΡΠ°Π±ΠΎΡΠ°Π½ ΠΏΠΎΠ΄Ρ
ΠΎΠ΄ ΠΊ ΠΏΠΎΡΡΡΠΎΠ΅Π½ΠΈΡ ΡΡΠ½ΠΊΡΠΈΠΎΠ½Π°Π»ΡΠ½ΡΡ
Π²ΡΡΠ°ΠΆΠ΅Π½ΠΈΠΉ Π΄Π»Ρ ΡΠ°ΡΡΠ΅ΡΠ° ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΡΡ
ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΠΏΠΎΠ΄ΡΠ°Π±ΠΎΡΠ°Π½Π½ΠΎΠ³ΠΎ ΠΌΠ°ΡΡΠΈΠ²Π° Π³ΠΎΡΠ½ΡΡ
ΠΏΠΎΡΠΎΠ΄ ΠΏΡΠΈ Π΅Π³ΠΎ ΠΏΠΎΠ²ΡΠΎΡΠ½ΠΎΠΉ ΠΏΠΎΠ΄ΡΠ°Π±ΠΎΡΠΊΠ΅ Ρ ΡΡΠ΅ΡΠΎΠΌ Π½Π°ΡΡΡΠ΅Π½ΠΈΠΉ ΡΠΏΠ»ΠΎΡΠ½ΠΎΡΡΠΈ ΠΌΠ°ΡΡΠΈΠ²Π° ΡΠ°Π·Π»ΠΈΡΠ½ΠΎΠ³ΠΎ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠ° ΠΈ Π²ΡΠ΅ΠΌΠ΅Π½ΠΈ, ΠΏΡΠΎΡΠ΅Π΄ΡΠ΅Π³ΠΎ ΠΏΠΎΡΠ»Π΅ ΠΏΠΎΠ΄ΡΠ°Π±ΠΎΡΠΊΠΈ. Π ΠΎΡΠ½ΠΎΠ²Ρ ΠΏΠΎΠ΄Ρ
ΠΎΠ΄Π° ΠΏΠΎΠ»ΠΎΠΆΠ΅Π½ΠΎ Π²Π²Π΅Π΄Π΅Π½ΠΈΠ΅ ΡΠΏΠ΅ΡΠΈΠ°Π»ΡΠ½ΡΡ
ΠΏΠΎΠΏΡΠ°Π²ΠΎΡΠ½ΡΡ
ΠΌΠ½ΠΎΠΆΠΈΡΠ΅Π»Π΅ΠΉ Π² Π²ΡΡΠ°ΠΆΠ΅Π½ΠΈΡ Π΄Π»Ρ ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΠΌΠ°ΡΡΠΈΠ²Π°. ΠΡΠΈ ΡΡΠΎΠΌ ΡΠΎΡΡΠΎΡΠ½ΠΈΠ΅ ΠΏΠΎΠ΄ΡΠ°Π±ΠΎΡΠ°Π½Π½ΠΎΠΉ ΠΎΠ±Π»Π°ΡΡΠΈ ΠΌΠ°ΡΡΠΈΠ²Π° ΡΠ°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°Π΅ΡΡΡ Π² ΠΏΡΠΈΠ±Π»ΠΈΠΆΠ΅Π½ΠΈΠΈ ΠΌΠΎΠ΄Π΅Π»Π΅ΠΉ ΡΠΏΠ»ΠΎΡΠ½ΡΡ
ΡΡΠ΅Π΄. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ ΠΎΠ΄Π½ΠΈΠΌ ΠΈΠ· Π²Π°ΠΆΠ½Π΅ΠΉΡΠΈΡ
ΡΠ°ΠΊΡΠΎΡΠΎΠ², ΠΊΠΎΡΠΎΡΡΠΉ ΡΡΠ΅Π±ΡΠ΅ΡΡΡ ΡΡΠΈΡΡΠ²Π°ΡΡ ΠΏΡΠΈ ΠΏΠΎΡΡΡΠΎΠ΅Π½ΠΈΠΈ ΡΡΠ½ΠΊΡΠΈΠΎΠ½Π°Π»ΡΠ½ΠΎΠΉ Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈ Π΄Π»Ρ ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΠΏΠΎΠ΄ΡΠ°Π±ΠΎΡΠ°Π½Π½ΠΎΠ³ΠΎ ΡΠ»ΠΎΠΈΡΡΠΎΠ³ΠΎ ΠΌΠ°ΡΡΠΈΠ²Π°, ΡΠ²Π»ΡΠ΅ΡΡΡ ΡΡΠ΅Ρ Π²Π·Π°ΠΈΠΌΠ½ΠΎΠ³ΠΎ ΠΏΡΠΎΡΠΊΠ°Π»ΡΠ·ΡΠ²Π°Π½ΠΈΡ ΡΠ»ΠΎΠ΅Π² ΠΈ ΡΠ²ΡΠ·Π°Π½Π½ΠΎΠ³ΠΎ Ρ Π½ΠΈΠΌ ΠΈΡ
ΠΎΡΡΠ»ΠΎΠ΅Π½ΠΈΡ, ΡΠ°ΠΊ ΠΊΠ°ΠΊ ΠΏΡΠΈ ΠΏΠΎΠ΄ΡΠ°Π±ΠΎΡΠΊΠ΅ ΠΌΠ°ΡΡΠΈΠ²Π° Π³Π»Π°Π²Π½ΡΠΌ ΠΎΠ±ΡΠ°Π·ΠΎΠΌ ΠΈΠ·ΠΌΠ΅Π½ΡΡΡΡΡ ΡΠ°ΠΊΠΈΠ΅ ΠΏΡΠΎΡΠ½ΠΎΡΡΠ½ΡΠ΅ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ, ΠΊΠ°ΠΊ ΡΡΠ΅ΠΏΠ»Π΅Π½ΠΈΠ΅ ΠΈ ΠΊΠΎΡΡΡΠΈΡΠΈΠ΅Π½Ρ Π²Π½ΡΡΡΠ΅Π½Π½Π΅Π³ΠΎ ΡΡΠ΅Π½ΠΈΡ. ΠΠ»Π³ΠΎΡΠΈΡΠΌ ΡΠ°ΡΡΠ΅ΡΠ° ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΠΏΠΎΠ΄ΡΠ°Π±ΠΎΡΠ°Π½Π½ΠΎΠ³ΠΎ ΠΌΠ°ΡΡΠΈΠ²Π° ΠΏΡΠ΅Π΄Π»Π°Π³Π°Π΅Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ ΠΏΠΎΠΏΡΠ°Π²ΠΎΡΠ½ΡΡ
ΠΌΠ½ΠΎΠΆΠΈΡΠ΅Π»Π΅ΠΉ, ΡΡΠΈΡΡΠ²Π°ΡΡΠΈΡ
Π½Π΅ΠΎΠ΄Π½ΠΎΡΠΎΠ΄Π½ΠΎΡΡΡ ΠΌΠ°ΡΡΠΈΠ²Π° Π³ΠΎΡΠ½ΡΡ
ΠΏΠΎΡΠΎΠ΄; ΡΠ°ΡΡΠ»ΠΎΠ΅Π½ΠΈΠ΅ ΠΈ ΠΏΡΠΎΡΠΊΠ°Π»ΡΠ·ΡΠ²Π°Π½ΠΈΠ΅ ΠΊΠΎΠ½ΡΠ°ΠΊΡΠΈΡΡΡΡΠΈΡ
ΡΠ»ΠΎΠ΅Π²; ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡ ΡΠ²ΠΎΠΉΡΡΠ² ΠΏΠΎΠ΄ΡΠ°Π±ΠΎΡΠ°Π½Π½ΠΎΠ³ΠΎ ΠΌΠ°ΡΡΠΈΠ²Π° ΠΏΡΠΈ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠΈ Π³Π»ΡΠ±ΠΈΠ½Ρ ΠΏΠΎΠ²ΡΠΎΡΠ½ΠΎΠΉ ΠΎΡΡΠ°Π±ΠΎΡΠΊΠΈ, ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ ΡΠ²ΠΎΠΉΡΡΠ² Π² ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠ΅ ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π½Π°ΡΡΡΠ΅Π½ΠΈΡ Π΅ΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠ³ΠΎ ΡΠ°Π²Π½ΠΎΠ²Π΅ΡΠ½ΠΎΠ³ΠΎ ΡΠΎΡΡΠΎΡΠ½ΠΈΡ ΠΌΠ°ΡΡΠΈΠ²Π° (ΠΏΠ΅ΡΠ²ΠΈΡΠ½Π°Ρ ΠΏΠΎΠ΄ΡΠ°Π±ΠΎΡΠΊΠ°, Π²ΡΠ΅ΠΌΡ, ΠΏΡΠΎΡΠ΅Π΄ΡΠ΅Π΅ ΡΠΎ Π²ΡΠ΅ΠΌΠ΅Π½ΠΈ ΠΏΠ΅ΡΠ²ΠΈΡΠ½ΠΎΠΉ ΠΏΠΎΠ΄ΡΠ°Π±ΠΎΡΠΊΠΈ)
ΠΡΠΈΡΠ΅ΡΠΈΠΈ ΠΏΡΠ΅Π΄Π΅Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠΎΡΡΠΎΡΠ½ΠΈΡ ΠΈ ΠΏΡΠΎΡΠ½ΠΎΡΡΠ½ΡΠ΅ Ρ Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ ΠΏΠΎΠ²ΡΠΎΡΠ½ΠΎ ΠΏΠΎΠ΄ΡΠ°Π±Π°ΡΡΠ²Π°Π΅ΠΌΡΡ ΠΌΠ°ΡΡΠΈΠ²ΠΎΠ² Π³ΠΎΡΠ½ΡΡ ΠΏΠΎΡΠΎΠ΄
Methodological approaches to the selection of ultimate state criteria and strength characteristics of the repeatedly undermined rock massifs were developed. These approaches were designed to provide parametric support to the geomechanical modelling of the massif stress-strain state and the mining systems of the Starobin potash deposit mine fields planned for the additional mining of the mineral reserves left. It was established that a complex criterion must be used to study the massif ultimate state. Determination of such criterion can be carried out using the developed approaches. The first approach is to select several criteria that evaluate the massif ultimate state by certain types of the massif stress-strain state. These criteria are the following: the criterion of the maximum normal stresses, criterion of the maximum linear strains, the criterion of the maximum shear stresses and the CoulombβMohr failure criterion. The second approach is to construct an integrated failure state criterion for materials whose ultimate tensile and compressive stresses differ significantly. In this case, parameters characterizing the type of stress state and properties of the material are introduced. These parameters together determine the destruction character β tear or shear. To describe the rocks behavior in the extreme strength stage of deformation, it is proposed to apply deformation theory of strength using the developed strain failure criterion. When calculating the strength characteristics of the repeatedly undermined rock massif, it is recommended to use a structural attenuation coefficient as the product of several factors, taking into account various types of disturbances in the primary undermined massif and the time factor. The CoulombβMohr strength condition is recommended to be used taking into account the composite structural attenuation coefficient. Dependencies have been developed to describe the change in the strength characteristics of rocks in the undermined massif, considering the attenuation coefficient.Π Π°Π·ΡΠ°Π±ΠΎΡΠ°Π½Ρ ΠΌΠ΅ΡΠΎΠ΄ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΏΠΎΠ΄Ρ
ΠΎΠ΄Ρ ΠΊ Π²ΡΠ±ΠΎΡΡ ΠΊΡΠΈΡΠ΅ΡΠΈΠ΅Π² ΠΏΡΠ΅Π΄Π΅Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠΎΡΡΠΎΡΠ½ΠΈΡ ΠΈ ΠΏΡΠΎΡΠ½ΠΎΡΡΠ½ΡΡ
Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΠΏΠΎΠ²ΡΠΎΡΠ½ΠΎ ΠΏΠΎΠ΄ΡΠ°Π±Π°ΡΡΠ²Π°Π΅ΠΌΡΡ
ΠΌΠ°ΡΡΠΈΠ²ΠΎΠ² Π³ΠΎΡΠ½ΡΡ
ΠΏΠΎΡΠΎΠ΄, ΠΏΡΠ΅Π΄Π½Π°Π·Π½Π°ΡΠ΅Π½Π½ΡΡ
Π΄Π»Ρ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠ΅Π½ΠΈΡ Π³Π΅ΠΎΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΌΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π½Π°ΠΏΡΡΠΆΠ΅Π½Π½ΠΎ-Π΄Π΅ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ ΡΠΎΡΡΠΎΡΠ½ΠΈΡ ΠΌΠ°ΡΡΠΈΠ²Π° ΠΈ Π³ΠΎΡΠ½ΠΎΡΠ΅Ρ
Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠΈΡΡΠ΅ΠΌ ΡΡΠ°ΡΡΠΊΠΎΠ² ΡΠ°Ρ
ΡΠ½ΡΡ
ΠΏΠΎΠ»Π΅ΠΉ Π‘ΡΠ°ΡΠΎΠ±ΠΈΠ½ΡΠΊΠΎΠ³ΠΎ ΠΌΠ΅ΡΡΠΎΡΠΎΠΆΠ΄Π΅Π½ΠΈΡ ΠΊΠ°Π»ΠΈΠΉΠ½ΠΎΠΉ ΡΡΠ΄Ρ, ΠΏΠ»Π°Π½ΠΈΡΡΠ΅ΠΌΡΡ
Π΄Π»Ρ Π΄ΠΎΠΈΠ·Π²Π»Π΅ΡΠ΅Π½ΠΈΡ ΠΎΡΡΠ°Π²Π»Π΅Π½Π½ΡΡ
Π·Π°ΠΏΠ°ΡΠΎΠ² ΠΏΠΎΠ»Π΅Π·Π½ΠΎΠ³ΠΎ ΠΈΡΠΊΠΎΠΏΠ°Π΅ΠΌΠΎΠ³ΠΎ. Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ Π΄Π»Ρ ΠΈΠ·ΡΡΠ΅Π½ΠΈΡ ΠΏΡΠ΅Π΄Π΅Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠΎΡΡΠΎΡΠ½ΠΈΡ ΠΌΠ°ΡΡΠΈΠ²Π° Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎ ΠΏΡΠΈΠΌΠ΅Π½ΡΡΡ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ½ΡΠΉ ΠΊΡΠΈΡΠ΅ΡΠΈΠΉ. ΠΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠ΅ ΡΠ°ΠΊΠΎΠ³ΠΎ ΠΊΡΠΈΡΠ΅ΡΠΈΡ ΠΌΠΎΠΆΠ½ΠΎ Π²ΡΠΏΠΎΠ»Π½ΠΈΡΡ Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠ°Π½Π½ΡΡ
ΠΏΠΎΠ΄Ρ
ΠΎΠ΄ΠΎΠ². ΠΠ΅ΡΠ²ΡΠΉ ΠΏΠΎΠ΄Ρ
ΠΎΠ΄ Π·Π°ΠΊΠ»ΡΡΠ°Π΅ΡΡΡ Π² Π²ΡΠ±ΠΎΡΠ΅ Π½Π΅ΡΠΊΠΎΠ»ΡΠΊΠΈΡ
ΠΊΡΠΈΡΠ΅ΡΠΈΠ΅Π², ΠΎΡΠ΅Π½ΠΈΠ²Π°ΡΡΠΈΡ
ΠΏΡΠ΅Π΄Π΅Π»ΡΠ½ΠΎΠ΅ ΡΠΎΡΡΠΎΡΠ½ΠΈΠ΅ ΠΌΠ°ΡΡΠΈΠ²Π° ΠΏΠΎ ΠΎΡΠ΄Π΅Π»ΡΠ½ΡΠΌ ΡΠΈΠΏΠ°ΠΌ Π½Π°ΠΏΡΡΠΆΠ΅Π½Π½ΠΎ-Π΄Π΅ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ ΡΠΎΡΡΠΎΡΠ½ΠΈΡ ΠΌΠ°ΡΡΠΈΠ²Π°: ΠΊΡΠΈΡΠ΅ΡΠΈΡ Π½Π°ΠΈΠ±ΠΎΠ»ΡΡΠΈΡ
Π½ΠΎΡΠΌΠ°Π»ΡΠ½ΡΡ
Π½Π°ΠΏΡΡΠΆΠ΅Π½ΠΈΠΉ, ΠΊΡΠΈΡΠ΅ΡΠΈΡ Π½Π°ΠΈΠ±ΠΎΠ»ΡΡΠΈΡ
Π»ΠΈΠ½Π΅ΠΉΠ½ΡΡ
Π΄Π΅ΡΠΎΡΠΌΠ°ΡΠΈΠΉ, ΠΊΡΠΈΡΠ΅ΡΠΈΡ Π½Π°ΠΈΠ±ΠΎΠ»ΡΡΠ΅Π³ΠΎ ΠΊΠ°ΡΠ°ΡΠ΅Π»ΡΠ½ΠΎΠ³ΠΎ Π½Π°ΠΏΡΡΠΆΠ΅Π½ΠΈΡ, ΠΊΡΠΈΡΠ΅ΡΠΈΡ ΠΡΠ»ΠΎΠ½Π°βΠΠΎΡΠ°. ΠΡΠΎΡΠΎΠΉ ΠΏΠΎΠ΄Ρ
ΠΎΠ΄ Π·Π°ΠΊΠ»ΡΡΠ°Π΅ΡΡΡ Π² ΠΏΠΎΡΡΡΠΎΠ΅Π½ΠΈΠΈ ΠΎΠ±ΡΠ΅Π΄ΠΈΠ½Π΅Π½Π½ΠΎΠ³ΠΎ ΠΊΡΠΈΡΠ΅ΡΠΈΡ ΠΏΡΠ΅Π΄Π΅Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠΎΡΡΠΎΡΠ½ΠΈΡ ΠΏΡΠ΅Π΄Π»Π°Π³Π°Π΅ΠΌΠΎΠ³ΠΎ Π²ΠΈΠ΄Π° Π΄Π»Ρ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ², Ρ ΠΊΠΎΡΠΎΡΡΡ
ΠΏΡΠ΅Π΄Π΅Π»ΡΠ½ΡΠ΅ Π²Π΅Π»ΠΈΡΠΈΠ½Ρ Π½Π°ΠΏΡΡΠΆΠ΅Π½ΠΈΠΉ Π½Π° ΡΠ°ΡΡΡΠΆΠ΅Π½ΠΈΠ΅ ΠΈ ΡΠΆΠ°ΡΠΈΠ΅ ΠΎΡΠ»ΠΈΡΠ°ΡΡΡΡ ΡΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΡΠΌ ΠΎΠ±ΡΠ°Π·ΠΎΠΌ. ΠΡΠΈ ΡΡΠΎΠΌ Π²Π²ΠΎΠ΄ΡΡΡΡ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΡ, Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΠ·ΡΡΡΠΈΠ΅ Π²ΠΈΠ΄ Π½Π°ΠΏΡΡΠΆΠ΅Π½Π½ΠΎΠ³ΠΎ ΡΠΎΡΡΠΎΡΠ½ΠΈΡ ΠΈ ΡΠ²ΠΎΠΉΡΡΠ²Π° ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π°, ΠΊΠΎΡΠΎΡΡΠ΅ Π² ΡΠΎΠ²ΠΎΠΊΡΠΏΠ½ΠΎΡΡΠΈ ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΡΡ Ρ
Π°ΡΠ°ΠΊΡΠ΅Ρ ΡΠ°Π·ΡΡΡΠ΅Π½ΠΈΡ β ΠΎΡΡΡΠ² ΠΈΠ»ΠΈ ΡΡΠ΅Π·. ΠΠ»Ρ ΠΎΠΏΠΈΡΠ°Π½ΠΈΡ ΠΏΠΎΠ²Π΅Π΄Π΅Π½ΠΈΡ Π³ΠΎΡΠ½ΡΡ
ΠΏΠΎΡΠΎΠ΄ Π² Π·Π°ΠΏΡΠ΅Π΄Π΅Π»ΡΠ½ΠΎΠΉ ΠΏΠΎ ΠΏΡΠΎΡΠ½ΠΎΡΡΠΈ ΡΡΠ°Π΄ΠΈΠΈ Π΄Π΅ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΏΡΠ΅Π΄Π»Π°Π³Π°Π΅ΡΡΡ ΠΏΡΠΈΠΌΠ΅Π½ΡΡΡ Π΄Π΅ΡΠΎΡΠΌΠ°ΡΠΈΠΎΠ½Π½ΡΡ ΡΠ΅ΠΎΡΠΈΡ ΠΏΡΠΎΡΠ½ΠΎΡΡΠΈ Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠ°Π½Π½ΠΎΠΉ Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈ Π΄Π΅ΡΠΎΡΠΌΠ°ΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΊΡΠΈΡΠ΅ΡΠΈΡ ΠΏΡΠΎΡΠ½ΠΎΡΡΠΈ. ΠΡΠΈ ΡΠ°ΡΡΠ΅ΡΠ΅ ΠΏΡΠΎΡΠ½ΠΎΡΡΠ½ΡΡ
Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΠΏΠΎΠ²ΡΠΎΡΠ½ΠΎ ΠΏΠΎΠ΄ΡΠ°Π±Π°ΡΡΠ²Π°Π΅ΠΌΠΎΠ³ΠΎ ΠΌΠ°ΡΡΠΈΠ²Π° Π³ΠΎΡΠ½ΡΡ
ΠΏΠΎΡΠΎΠ΄ ΡΠ΅ΠΊΠΎΠΌΠ΅Π½Π΄ΡΠ΅ΡΡΡ ΠΏΡΠΈΠΌΠ΅Π½ΡΡΡ ΠΊΠΎΡΡΡΠΈΡΠΈΠ΅Π½Ρ ΡΡΡΡΠΊΡΡΡΠ½ΠΎΠ³ΠΎ ΠΎΡΠ»Π°Π±Π»Π΅Π½ΠΈΡ Π² Π²ΠΈΠ΄Π΅ ΠΏΡΠΎΠΈΠ·Π²Π΅Π΄Π΅Π½ΠΈΡ Π½Π΅ΡΠΊΠΎΠ»ΡΠΊΠΈΡ
ΠΊΠΎΡΡΡΠΈΡΠΈΠ΅Π½ΡΠΎΠ², ΡΡΠΈΡΡΠ²Π°ΡΡΠΈΡ
ΡΠ°Π·Π»ΠΈΡΠ½ΡΠ΅ ΡΠΈΠΏΡ Π½Π°ΡΡΡΠ΅Π½ΠΈΡ ΠΏΠ΅ΡΠ²ΠΈΡΠ½ΠΎ ΠΏΠΎΠ΄ΡΠ°Π±ΠΎΡΠ°Π½Π½ΠΎΠ³ΠΎ ΠΌΠ°ΡΡΠΈΠ²Π° ΠΈ Π²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠΉ ΡΠ°ΠΊΡΠΎΡ. Π£ΡΠ»ΠΎΠ²ΠΈΠ΅ ΠΏΡΠΎΡΠ½ΠΎΡΡΠΈ ΠΡΠ»ΠΎΠ½Π°βΠΠΎΡΠ° ΡΠ΅ΠΊΠΎΠΌΠ΅Π½Π΄ΡΠ΅ΡΡΡ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°ΡΡ Ρ ΡΡΠ΅ΡΠΎΠΌ ΡΠΎΡΡΠ°Π²Π½ΠΎΠ³ΠΎ ΠΊΠΎΡΡΡΠΈΡΠΈΠ΅Π½ΡΠ° ΡΡΡΡΠΊΡΡΡΠ½ΠΎΠ³ΠΎ ΠΎΡΠ»Π°Π±Π»Π΅Π½ΠΈΡ. Π Π°Π·ΡΠ°Π±ΠΎΡΠ°Π½Ρ Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈ, ΠΎΠΏΠΈΡΡΠ²Π°ΡΡΠΈΠ΅ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ ΠΏΡΠΎΡΠ½ΠΎΡΡΠ½ΡΡ
Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΠΏΠΎΡΠΎΠ΄ Π² ΠΏΠΎΠ΄ΡΠ°Π±ΠΎΡΠ°Π½Π½ΠΎΠΌ ΠΌΠ°ΡΡΠΈΠ²Π΅ Ρ ΡΡΠ΅ΡΠΎΠΌ ΠΊΠΎΡΡΡΠΈΡΠΈΠ΅Π½ΡΠ° ΡΠ°Π·ΡΡΡ
Π»Π΅Π½ΠΈΡ
ΠΠΏΡΠΈΠΌΠΈΠ·Π°ΡΠΈΡ ΠΈΠ·Π»ΡΡΠ°ΡΡΠ΅ΠΉ ΠΊΠ°ΡΡΡΠΊΠΈ ΠΏΡΠΎΠ³ΡΠ°ΠΌΠΌΠ½ΠΎ-Π°ΠΏΠΏΠ°ΡΠ°ΡΠ½ΠΎΠ³ΠΎ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ° Π΄Π»Ρ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΡΠΊΡΠ°Π½ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π½ΠΈΠ·ΠΊΠΎΡΠ°ΡΡΠΎΡΠ½ΠΎΠ³ΠΎ ΡΠ»Π΅ΠΊΡΡΠΎΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎΠ³ΠΎ ΠΈΠ·Π»ΡΡΠ΅Π½ΠΈΡ
Optimization of the radiation coil of the hardware-software complex for studying the effectiveness of shielding of low-frequency electromagnetic radiation will make it possible to assess the effectiveness of shielding coatings at a higher level. This fact will make it possible to develop coatings with improved characteristics. The purpose of this work was to determine the optimal characteristics of the emitting coil which will ensure its stable operation and magnetic field strength in the frequency range up to 100 kHz.The parameters of the manufactured samples, such as inductance (L), active (R) and total resistance (Z), were obtained using an MNIPI E7-20 emittance meter. In practice, the coils with the optimal parameters calculated theoretically were connected to a current source and amplifier. To detect electromagnetic radiation, a multilayer inductor connected to a UTB-TREND 722-050-5 oscilloscope was used as a signal receiver.The results of measurements showed that the resistance of multilayer coils is approximately 1000 times higher than that of single-layer coils. Also, for multilayer coils, an avalanche-like increase in total resistance is observed starting from a frequency of 10 kHz, while for single-layer coils there is a uniform increase in total resistance over the entire frequency range up to 100 kHz.The paper presents results of research on the correlation of the performance of single-layer and multilayer inductors depending on their parameters in the frequency range from Β 20 Hz Β to Β 100 kHz. Values of the voltage required to provide the magnetic field strength of 1, 5, 20 Oe at 25 Hz and 100 kHz have been calculated. After analyzing the data obtained, the optimal parameters of the inductor were found which ensure stable performance in the frequency range up to 100 kHz.ΠΠΏΡΠΈΠΌΠΈΠ·Π°ΡΠΈΡ ΠΈΠ·Π»ΡΡΠ°ΡΡΠ΅ΠΉ ΠΊΠ°ΡΡΡΠΊΠΈ ΠΏΡΠΎΠ³ΡΠ°ΠΌΠΌΠ½ΠΎ-Π°ΠΏΠΏΠ°ΡΠ°ΡΠ½ΠΎΠ³ΠΎ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ° Π΄Π»Ρ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΡΠΊΡΠ°Π½ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π½ΠΈΠ·ΠΊΠΎΡΠ°ΡΡΠΎΡΠ½ΠΎΠ³ΠΎ ΡΠ»Π΅ΠΊΡΡΠΎΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎΠ³ΠΎ ΠΈΠ·Π»ΡΡΠ΅Π½ΠΈΡ ΠΏΠΎΠ·Π²ΠΎΠ»ΠΈΡ Π½Π° Π±ΠΎΠ»Π΅Π΅ ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠΌ ΡΡΠΎΠ²Π½Π΅ ΠΎΡΠ΅Π½ΠΈΠ²Π°ΡΡ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΡΠΊΡΠ°Π½ΠΈΡΡΡΡΠΈΡ
ΠΏΠΎΠΊΡΡΡΠΈΠΉ. ΠΠ°Π½Π½ΡΠΉ ΡΠ°ΠΊΡ Π΄Π°ΡΡ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΡ ΡΠ°Π·ΡΠ°Π±Π°ΡΡΠ²Π°ΡΡ ΠΏΠΎΠΊΡΡΡΠΈΡ Ρ ΡΠ»ΡΡΡΠ΅Π½Π½ΡΠΌΠΈ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠ°ΠΌΠΈ. Π¦Π΅Π»ΡΡ Π΄Π°Π½Π½ΠΎΠΉ ΡΠ°Π±ΠΎΡΡ ΡΠ²Π»ΡΠ»ΠΎΡΡ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠ΅ ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΡΡ
Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΠΈΠ·Π»ΡΡΠ°ΡΡΠ΅ΠΉ ΠΊΠ°ΡΡΡΠΊΠΈ, ΠΊΠΎΡΠΎΡΡΠ΅ ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠ°Ρ Π΅Ρ ΡΡΠ°Π±ΠΈΠ»ΡΠ½ΡΡ ΡΠ°Π±ΠΎΡΡ ΠΈ Π½Π°ΠΏΡΡΠΆΡΠ½Π½ΠΎΡΡΡ ΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎΠ³ΠΎ ΠΏΠΎΠ»Ρ Π² ΡΠ°ΡΡΠΎΡΠ½ΠΎΠΌ Π΄ΠΈΠ°ΠΏΠ°Π·ΠΎΠ½Π΅ Π΄ΠΎ 100 ΠΊΠΡ.ΠΠ°ΡΠ°ΠΌΠ΅ΡΡΡ ΠΈΠ·Π³ΠΎΡΠΎΠ²Π»Π΅Π½Π½ΡΡ
ΠΎΠ±ΡΠ°Π·ΡΠΎΠ², ΡΠ°ΠΊΠΈΠ΅ ΠΊΠ°ΠΊ ΠΈΠ½Π΄ΡΠΊΡΠΈΠ²Π½ΠΎΡΡΡ, Π°ΠΊΡΠΈΠ²Π½ΠΎΠ΅ ΠΈ ΠΎΠ±ΡΠ΅Π΅ ΡΠΎΠΏΡΠΎΡΠΈΠ²Π»Π΅Π½ΠΈΠ΅, Π±ΡΠ»ΠΈ ΠΏΠΎΠ»ΡΡΠ΅Π½Ρ, ΠΈΡΠΏΠΎΠ»ΡΠ·ΡΡ ΠΈΠ·ΠΌΠ΅ΡΠΈΡΠ΅Π»Ρ ΠΈΠΌΠΌΠΈΡΠ°Π½ΡΠ° ΠΠΠΠΠ E7-20. ΠΠ° ΠΏΡΠ°ΠΊΡΠΈΠΊΠ΅ ΠΊΠ°ΡΡΡΠΊΠΈ Ρ ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΡΠΌΠΈ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠ°ΠΌΠΈ, Π²ΡΡΠΈΡΠ»Π΅Π½Π½ΡΠΌΠΈ ΡΠ΅ΠΎΡΠ΅ΡΠΈΡΠ΅ΡΠΊΠΈ, Π±ΡΠ»ΠΈ ΠΏΠΎΠ΄ΠΊΠ»ΡΡΠ΅Π½Ρ ΠΊ ΠΈΡΡΠΎΡΠ½ΠΈΠΊΡ ΠΈ ΡΡΠΈΠ»ΠΈΡΠ΅Π»Ρ ΡΠΎΠΊΠ°. ΠΠ»Ρ Π΄Π΅ΡΠ΅ΠΊΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠ»Π΅ΠΊΡΡΠΎΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎΠ³ΠΎ ΠΈΠ·Π»ΡΡΠ΅Π½ΠΈΡ Π² ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ ΠΏΡΠΈΡΠΌΠ½ΠΈΠΊΠ° ΡΠΈΠ³Π½Π°Π»Π° ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π»Π°ΡΡ ΠΌΠ½ΠΎΠ³ΠΎΡΠ»ΠΎΠΉΠ½Π°Ρ ΠΊΠ°ΡΡΡΠΊΠ° ΠΈΠ½Π΄ΡΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ, ΠΏΠΎΠ΄ΠΊΠ»ΡΡΡΠ½Π½Π°Ρ ΠΊ ΠΎΡΡΠΈΠ»Π»ΠΎΠ³ΡΠ°ΡΡ UTB-TREND 722-050-5.Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½ΠΈΠΉ ΠΏΠΎΠΊΠ°Π·Π°Π»ΠΈ, ΡΡΠΎ ΡΠΎΠΏΡΠΎΡΠΈΠ²Π»Π΅Π½ΠΈΠ΅ ΠΌΠ½ΠΎΠ³ΠΎΡΠ»ΠΎΠΉΠ½ΡΡ
ΠΊΠ°ΡΡΡΠ΅ΠΊ ΠΏΡΠΈΠ±Π»ΠΈΠ·ΠΈΡΠ΅Π»ΡΠ½ΠΎ Π² 1000 ΡΠ°Π· Π±ΠΎΠ»ΡΡΠ΅ ΡΠΎΠΏΡΠΎΡΠΈΠ²Π»Π΅Π½ΠΈΡ ΠΎΠ΄Π½ΠΎΡΠ»ΠΎΠΉΠ½ΡΡ
. Π’Π°ΠΊΠΆΠ΅ Ρ ΠΌΠ½ΠΎΠ³ΠΎΡΠ»ΠΎΠΉΠ½ΡΡ
ΠΊΠ°ΡΡΡΠ΅ΠΊ Π½Π°Π±Π»ΡΠ΄Π°Π΅ΡΡΡ Π»Π°Π²ΠΈΠ½ΠΎΠΎΠ±ΡΠ°Π·Π½ΡΠΉ ΡΠΎΡΡ ΠΎΠ±ΡΠ΅Π³ΠΎ ΡΠΎΠΏΡΠΎΡΠΈΠ²Π»Π΅Π½ΠΈΡ, Π½Π°ΡΠΈΠ½Π°Ρ Ρ ΡΠ°ΡΡΠΎΡΡ 10 ΠΊΠΡ, Π² ΡΠΎ Π²ΡΠ΅ΠΌΡ ΠΊΠ°ΠΊ Ρ ΠΎΠ΄Π½ΠΎΡΠ»ΠΎΠΉΠ½ΡΡ
ΠΊΠ°ΡΡΡΠ΅ΠΊ ΠΏΡΠΎΠΈΡΡ
ΠΎΠ΄ΠΈΡ ΡΠ°Π²Π½ΠΎΠΌΠ΅ΡΠ½ΡΠΉ ΡΠΎΡΡ ΠΎΠ±ΡΠ΅Π³ΠΎ ΡΠΎΠΏΡΠΎΡΠΈΠ²Π»Π΅Π½ΠΈΡ Π½Π° Π²ΡΡΠΌ Π΄ΠΈΠ°ΠΏΠ°Π·ΠΎΠ½Π΅ ΡΠ°ΡΡΠΎΡ Π΄ΠΎ 100 ΠΊΠΡ. ΠΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ ΠΊΠΎΡΡΠ΅Π»ΡΡΠΈΠΈ ΡΠ°Π±ΠΎΡΠΈΡ
Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ Β ΠΎΠ΄Π½ΠΎΡΠ»ΠΎΠΉΠ½ΡΡ
Β ΠΈ ΠΌΠ½ΠΎΠ³ΠΎΡΠ»ΠΎΠΉΠ½ΡΡ
Β ΠΊΠ°ΡΡΡΠ΅ΠΊΒ ΠΈΠ½Π΄ΡΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈΒ Π²Β Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈΒ ΠΎΡΒ ΠΈΡ
Β ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠΎΠ²Β Π²Β ΡΠ°ΡΡΠΎΡΠ½ΠΎΠΌΒ Π΄ΠΈΠ°ΠΏΠ°Π·ΠΎΠ½Π΅ ΠΎΡ 20 ΠΡ Π΄ΠΎ 100 ΠΊΠΡ. Π Π°ΡΡΡΠΈΡΠ°Π½Ρ Π·Π½Π°ΡΠ΅Π½ΠΈΡ Π½Π°ΠΏΡΡΠΆΠ΅Π½ΠΈΡ, Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎΠ³ΠΎ Π΄Π»Ρ ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠ΅Π½ΠΈΡ Π½Π°ΠΏΡΡΠΆΡΠ½Π½ΠΎΡΡΠΈ ΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎΠ³ΠΎ ΠΏΠΎΠ»Ρ 1, 5, 20 Π ΠΏΡΠΈ 25 ΠΡ ΠΈ 100 ΠΊΠΡ. ΠΡΠΎΠ°Π½Π°Π»ΠΈΠ·ΠΈΡΠΎΠ²Π°Π² ΠΏΠΎΠ»ΡΡΠ΅Π½Π½ΡΠ΅ Π΄Π°Π½Π½ΡΠ΅, Π½Π°ΠΉΠ΄Π΅Π½Ρ ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΡΠ΅ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΡ ΠΊΠ°ΡΡΡΠΊΠΈ ΠΈΠ½Π΄ΡΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ, ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠΈΠ²Π°ΡΡΠΈΠ΅ ΡΡΠ°Π±ΠΈΠ»ΡΠ½ΡΠ΅ ΡΠ°Π±ΠΎΡΠΈΠ΅ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ Π² Π΄ΠΈΠ°ΠΏΠ°Π·ΠΎΠ½Π΅ ΡΠ°ΡΡΠΎΡ Π΄ΠΎ 100 ΠΊΠΡ
Melting of tantalum at high pressure determined by angle dispersive x-ray diffraction in a double-sided laser-heated diamond-anvil cell
The high pressure and high temperature phase diagram of Ta has been studied
in a laser-heated diamond-anvil cell (DAC) using x-ray diffraction measurements
up to 52 GPa and 3800 K. The melting was observed at nine different pressures,
being the melting temperature in good agreement with previous laser-heated DAC
experiments, but in contradiction with several theoretical calculations and
previous piston-cylinder apparatus experiments. A small slope for the melting
curve of Ta is estimated (dTm/dP = 24 K/GPa at 1 bar) and a possible
explanation for this behaviour is given. Finally, a P-V-T equation of states is
obtained, being the temperature dependence of the thermal expansion coefficient
and the bulk modulus estimated.Comment: 31 pages, 8 figures, to appear in J.Phys.:Cond.Matte
Study the effect of curcumin microparticles on structure and properties of blood cells membranes by the atomic force microscopy
On the Transmit Beamforming for MIMO Wiretap Channels: Large-System Analysis
With the growth of wireless networks, security has become a fundamental issue
in wireless communications due to the broadcast nature of these networks. In
this work, we consider MIMO wiretap channels in a fast fading environment, for
which the overall performance is characterized by the ergodic MIMO secrecy
rate. Unfortunately, the direct solution to finding ergodic secrecy rates is
prohibitive due to the expectations in the rates expressions in this setting.
To overcome this difficulty, we invoke the large-system assumption, which
allows a deterministic approximation to the ergodic mutual information.
Leveraging results from random matrix theory, we are able to characterize the
achievable ergodic secrecy rates. Based on this characterization, we address
the problem of covariance optimization at the transmitter. Our numerical
results demonstrate a good match between the large-system approximation and the
actual simulated secrecy rates, as well as some interesting features of the
precoder optimization.Comment: Published in Lecture Notes in Computer Science 8317, pp. 90-102,
2014. (Proceedings of International Conference on Information-Theoretic
Security (ICITS), Singapore, November 2013
Π’ΠΎΠ½ΠΊΠΈΠ΅ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠΈΠΎΠ½Π½ΡΠ΅ ΠΏΠΎΠΊΡΡΡΠΈΡ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΠΆΠ΅Π»Π°ΡΠΈΠ½Π° Ρ Π½Π΅ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΠΌΠΈ Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΡΠ°ΠΌΠΈ
A technique for the formation of gelatin thin films and composite coatings with silicon dioxide and zinc oxide nanoparticles by spin coating has been developed. New data of the morphology and structural characteristics of the formed gelatin and nanocomposite films were obtained by atomic force microscopy. The dependences of the roughness parameters of composite coatings on the content of silicon dioxide and zinc oxide nanoparticles in the polymer matrix are presented. It has been shown that the introduction of inorganic nanoparticles into the gelatin structure makes it possible to form nanocomposites with a rough surface. It has been established that the silicon dioxide nanoparticles incorporation leads to hydrophobization of the surface of polymer-inorganic films based on gelatin. Modification with zinc oxide nanoparticles (up to 8 mg per 1 mg of gelatin) improves the wettability of nanocomposite coatings with water.Π Π°Π·ΡΠ°Π±ΠΎΡΠ°Π½Π° ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊΠ° ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠΎΠ½ΠΊΠΈΡ
ΠΏΠ»Π΅Π½ΠΎΠΊ ΠΆΠ΅Π»Π°ΡΠΈΠ½Π° ΠΈ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠΈΠΎΠ½Π½ΡΡ
ΠΏΠΎΠΊΡΡΡΠΈΠΉ Ρ Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΡΠ°ΠΌΠΈ Π΄ΠΈΠΎΠΊΡΠΈΠ΄Π° ΠΊΡΠ΅ΠΌΠ½ΠΈΡ ΠΈ ΠΎΠΊΡΠΈΠ΄Π° ΡΠΈΠ½ΠΊΠ° ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ ΡΠΏΠΈΠ½-ΠΊΠΎΠ°ΡΠΈΠ½Π³Π°. ΠΠ΅ΡΠΎΠ΄ΠΎΠΌ Π°ΡΠΎΠΌΠ½ΠΎ-ΡΠΈΠ»ΠΎΠ²ΠΎΠΉ ΠΌΠΈΠΊΡΠΎΡΠΊΠΎΠΏΠΈΠΈ ΠΏΠΎΠ»ΡΡΠ΅Π½Ρ Π½ΠΎΠ²ΡΠ΅ Π΄Π°Π½Π½ΡΠ΅ ΠΎ ΠΌΠΎΡΡΠΎΠ»ΠΎΠ³ΠΈΠΈ ΠΈ ΡΡΡΡΠΊΡΡΡΠ½ΡΡ
Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠ°Ρ
ΡΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½Π½ΡΡ
ΠΆΠ΅Π»Π°ΡΠΈΠ½ΠΎΠ²ΡΡ
ΠΈ Π½Π°Π½ΠΎΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠΈΠΎΠ½Π½ΡΡ
ΠΏΠ»Π΅Π½ΠΎΠΊ. ΠΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Ρ Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠΎΠ² ΡΠ΅ΡΠΎΡ
ΠΎΠ²Π°ΡΠΎΡΡΠΈ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠΈΠΎΠ½Π½ΡΡ
ΠΏΠΎΠΊΡΡΡΠΈΠΉ ΠΎΡ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΡ Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΡ Π΄ΠΈΠΎΠΊΡΠΈΠ΄Π° ΠΊΡΠ΅ΠΌΠ½ΠΈΡ ΠΈ ΠΎΠΊΡΠΈΠ΄Π° ΡΠΈΠ½ΠΊΠ° Π² ΠΏΠΎΠ»ΠΈΠΌΠ΅ΡΠ½ΠΎΠΉ ΠΌΠ°ΡΡΠΈΡΠ΅. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ Π²Π²Π΅Π΄Π΅Π½ΠΈΠ΅ Π½Π΅ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΡ Π² ΡΡΡΡΠΊΡΡΡΡ ΠΆΠ΅Π»Π°ΡΠΈΠ½Π° ΠΏΠΎΠ·Π²ΠΎΠ»ΡΠ΅Ρ ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°ΡΡ Π½Π°Π½ΠΎΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΡ Ρ Π±ΠΎΠ»Π΅Π΅ ΡΠ°Π·Π²ΠΈΡΠΎΠΉ ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΡΡ. Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ Π²Π²Π΅Π΄Π΅Π½ΠΈΠ΅ Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΡ Π΄ΠΈΠΎΠΊΡΠΈΠ΄Π° ΠΊΡΠ΅ΠΌΠ½ΠΈΡ ΠΏΡΠΈΠ²ΠΎΠ΄ΠΈΡ ΠΊ Π³ΠΈΠ΄ΡΠΎΡΠΎΠ±ΠΈΠ·Π°ΡΠΈΠΈ ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠΈ ΠΏΠΎΠ»ΠΈΠΌΠ΅Ρ-Π½Π΅ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΏΠ»Π΅Π½ΠΎΠΊ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΠΆΠ΅Π»Π°ΡΠΈΠ½Π°, Π² ΡΠΎ Π²ΡΠ΅ΠΌΡ ΠΊΠ°ΠΊ ΠΌΠΎΠ΄ΠΈΡΠΈΠΊΠ°ΡΠΈΡ Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΡΠ°ΠΌΠΈ ΠΎΠΊΡΠΈΠ΄Π° ΡΠΈΠ½ΠΊΠ° (Π΄ΠΎ 8 ΠΌΠ³ Π½Π° 1 ΠΌΠ³ ΠΆΠ΅Π»Π°ΡΠΈΠ½Π°) ΠΏΠΎΠ·Π²ΠΎΠ»ΡΠ΅Ρ ΡΠ»ΡΡΡΠΈΡΡ ΡΠΌΠ°ΡΠΈΠ²Π°Π΅ΠΌΠΎΡΡΡ Π½Π°Π½ΠΎΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠΈΠΎΠ½Π½ΡΡ
ΠΏΠΎΠΊΡΡΡΠΈΠΉ Π²ΠΎΠ΄ΠΎΠΉ
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