The Engineering Geological Map of the Sakha（Yakutia） Republic covers about 3 million kilometers which is one-fifth of the territory of Russia.The map displays ground and geocryological conditions and active faults.S...The Engineering Geological Map of the Sakha（Yakutia） Republic covers about 3 million kilometers which is one-fifth of the territory of Russia.The map displays ground and geocryological conditions and active faults.Seismic intensity,schemes of zoning by factors of engineering geological conditions,and the general scheme of engineering geological zoning of the Sakha（Yakutia） Republic or the SR（Y）,are shown on the inset maps.The map is required to provide information for planning,construction and exploitation of engineering structures in the SR（Y）.A distinguishing feature of the map is the indication of almost blanket distribution of the frozen ground class.Types of the frozen ground class are separated by lithology,while ground varieties are separated by temperature.Fresh and ultra-fresh suprapermafrost water is predominant within the territory.The compiled map indicates parts of the Arctic-Asian and Baikalo-Stanovoi planetary seismic belts that make engineering geological conditions more complicated.展开更多
The aim of this study is to optimize the conditions for producing thin VO_(2)films for their use in SAW devices.We used the pulsed laser deposition(PLD)method to produce VO_(2)films.We used a metallic vanadium target....The aim of this study is to optimize the conditions for producing thin VO_(2)films for their use in SAW devices.We used the pulsed laser deposition(PLD)method to produce VO_(2)films.We used a metallic vanadium target.The dependence of the oxygen pressure during PLD on the resistive metal-insulator transition(MIT)on substrates of c-sapphire and LiNbO_(3)YX/128°was studied.The resulting films had sharp metal-insulator temperature transitions on c-Al_(2)O_(3).The most high-quality films showed resistance change by four orders of magnitude.At the lower point of the hysteresis,the resistance of these samples was in the range of 50-100Ω.The synthesized VO_(2)films had a sharp temperature transition and a relatively small width of thermal hysteresis.The SAW damping during its passage through a VO_(2)/ZnO/LiNbO_(3)YX/128°film at the metal-insulator phase transition temperature was studied.Attenuation SAW decreases with increasing temperature from 52 dB/cm to 0 dB/cm.展开更多
Epitaxial VO_(2)films grown by pulsed laser deposition(PLD)method with superior phase transition related switching characteristics are successfully embedded to SAW devices using concept of the“impedance loaded SAW se...Epitaxial VO_(2)films grown by pulsed laser deposition(PLD)method with superior phase transition related switching characteristics are successfully embedded to SAW devices using concept of the“impedance loaded SAW sensor”.A resistance of VO2 sensor abruptly drops from 0.7 MΩto 90Ωwhen it is heated above~65℃and shows a narrow hysteresis loops when switching.Two designs of SAW devices are examined in which RF signal is reflected back from interdigital transducer(IDT)or a surface acoustic waves(SAW)is transferred through a coupler and the RF response is altered 2 and 3 times correspondingly upon the phase transition in VO2.In the proposed devices with external load,a SAW does not propagate via VO2 film and therefore is not attenuated which is beneficiary for wireless applications.Additionally,a SAW phase shift as great as 50°is induced to the SAW transferred through the coupler due to the phase transition in VO2.The proposed approach may boost the development of remotely controlled autonomous sensors,including those based on VO2 metamaterials and hybrid plasmonic structures for near IR/middle IR and sub-THz/THz applications.展开更多
文摘The Engineering Geological Map of the Sakha（Yakutia） Republic covers about 3 million kilometers which is one-fifth of the territory of Russia.The map displays ground and geocryological conditions and active faults.Seismic intensity,schemes of zoning by factors of engineering geological conditions,and the general scheme of engineering geological zoning of the Sakha（Yakutia） Republic or the SR（Y）,are shown on the inset maps.The map is required to provide information for planning,construction and exploitation of engineering structures in the SR（Y）.A distinguishing feature of the map is the indication of almost blanket distribution of the frozen ground class.Types of the frozen ground class are separated by lithology,while ground varieties are separated by temperature.Fresh and ultra-fresh suprapermafrost water is predominant within the territory.The compiled map indicates parts of the Arctic-Asian and Baikalo-Stanovoi planetary seismic belts that make engineering geological conditions more complicated.
基金This research work is supported by Southern Federal University,project No.07/2020-06-MM.
文摘The aim of this study is to optimize the conditions for producing thin VO_(2)films for their use in SAW devices.We used the pulsed laser deposition(PLD)method to produce VO_(2)films.We used a metallic vanadium target.The dependence of the oxygen pressure during PLD on the resistive metal-insulator transition(MIT)on substrates of c-sapphire and LiNbO_(3)YX/128°was studied.The resulting films had sharp metal-insulator temperature transitions on c-Al_(2)O_(3).The most high-quality films showed resistance change by four orders of magnitude.At the lower point of the hysteresis,the resistance of these samples was in the range of 50-100Ω.The synthesized VO_(2)films had a sharp temperature transition and a relatively small width of thermal hysteresis.The SAW damping during its passage through a VO_(2)/ZnO/LiNbO_(3)YX/128°film at the metal-insulator phase transition temperature was studied.Attenuation SAW decreases with increasing temperature from 52 dB/cm to 0 dB/cm.
基金supported by Southern Federal University research project No.07/2020-06-MM and 10th Anniversary International Conference on“Physics and Mechanics of New Materials and Their Applications”(PHENMA 2021-2022).
文摘Epitaxial VO_(2)films grown by pulsed laser deposition(PLD)method with superior phase transition related switching characteristics are successfully embedded to SAW devices using concept of the“impedance loaded SAW sensor”.A resistance of VO2 sensor abruptly drops from 0.7 MΩto 90Ωwhen it is heated above~65℃and shows a narrow hysteresis loops when switching.Two designs of SAW devices are examined in which RF signal is reflected back from interdigital transducer(IDT)or a surface acoustic waves(SAW)is transferred through a coupler and the RF response is altered 2 and 3 times correspondingly upon the phase transition in VO2.In the proposed devices with external load,a SAW does not propagate via VO2 film and therefore is not attenuated which is beneficiary for wireless applications.Additionally,a SAW phase shift as great as 50°is induced to the SAW transferred through the coupler due to the phase transition in VO2.The proposed approach may boost the development of remotely controlled autonomous sensors,including those based on VO2 metamaterials and hybrid plasmonic structures for near IR/middle IR and sub-THz/THz applications.
