68 research outputs found
Qubits made by advanced semiconductor manufacturing
Full text linkAbstractFull-scale quantum computers require the integration of millions of qubits, and the potential of using industrial semiconductor manufacturing to meet this need has driven the development of quantum computing in silicon quantum dots. However, fabrication has so far relied on electron-beam lithography and, with a few exceptions, conventional lift-off processes that suffer from low yield and poor uniformity. Here we report quantum dots that are hosted at a 28Si/28SiO2 interface and fabricated in a 300âmm semiconductor manufacturing facility using all-optical lithography and fully industrial processing. With this approach, we achieve nanoscale gate patterns with excellent yield. In the multi-electron regime, the quantum dots allow good tunnel barrier controlâa crucial feature for fault-tolerant two-qubit gates. Single-spin qubit operation using magnetic resonance in the few-electron regime reveals relaxation times of over 1âs at 1âT and coherence times of over 3âms.</jats:p
Statistical Characteristics of Angstrom Fire Index for Telavi (Georgia)
No full textThe results of a statistical analysis of the daily values of the Angstrom Fire Index (I) for Telavi (Georgia) in the period 2010, 2012-2015 are presented. AFI = (R/20) + (27-T)/10, where R is the minimum relative humidity, T is the maximum air temperature. The gradations of the values of I are as follows: I. AFI> 4.0 - Fire occurrence unlikely, II.AFI = 4.0 ÷ 2.5 - Fire conditions unfavorable, III. AFI = 2.5 ÷ 2.0 - Fire conditions favorable, IY. AFI = <2.0 - Fire occurrence very likely. In particular, it was found that a high fire hazard in Telavi is observed on average within 67 days a year, and increased - within 43 days a year. The largest number of days with high fire hazard was observed in 2013 (98 days), the smallest - in 2012 (44 days). Further, it is planned to expand work on this issue (using other more complex fire hazard indices, studying their trends in connection with climate change, determining these indices fo
Study of Some Characteristics of the Thermodynamic State of the Atmosphere for Local Convection Processes
No full textá¡á¢áá¢ááášá ášááá¡á¬áááááá áááááá£á á¢áá áá¢áá áááá áááááá¥áªáá£á á áŠá á£áááááá¡ á€áá ááá áááá¡ áá ááªáá¡ášá áá¢ááá¡á€áá áá¡ áááááá áá ááá áááááááááá£á á ááá áááá¢á á áá¢ááá¡á€áá áá¡ ášááááááá ááááááá ááááá¡ áááá¡áááŠáá áá¡ áááááá. ááá á«áá ááŠááá¡ááááá á¡áá¥áá áááááá¡ áááááá áá á áááááá¡ááááá¡ ášáá¡á¬ááááááá áá ááááá áááááá¡ áááá áááá¡ á ááªá®áááá áááášáááááááááá¡ áªáááááááá¡ á®áá¡áááá, áá¢ááá¡á€áá áá¡ ááá áááááááááá£á á ááááááá áááá áá ášáá¡áááááá¡á áááááá£á á áááááá¥áªáá£á á áá ááªáá¡ááá.The article presents the importance of studying the thermodynamic state of the atmosphere during the formation of convective clouds in the local area. Numerical values of the energy of instability for some regions of Eastern Georgia are given and the change of its numerical values during the day is determined
Statistical Characteristics of Angstrom Fire Index for Tbilisi
No full textThe results of a statistical analysis of the daily values ââof the Angstrom Fire Index (I) for Tbilisi in the period from 2014 to 2018 are presented. AFI = (R/20) + (27-T)/10, where R is the minimum relative humidity, T is the maximum air temperature. The gradations of the values ââof I are as follows: I. AFI> 4.0 - Fire occurrence unlikely, II.AFI = 4.0 ÷ 2.5 - Fire conditions unfavorable, III. AFI = 2.5 ÷ 2.0 - Fire conditions favorable, IY. AFI = <2.0 - Fire occurrence very likely. In particular, it was found that a high fire hazard in Tbilisi is observed on average within 75 days a year, and increased - within 39 days a year. The largest number of days with high fire hazard was observed in 2018 (92 days), the smallest - in 2016 (57 days). Further, it is planned to expand work on this issue (using other more complex fire hazard indices, studying their trends in connection with climate change, determining these indices for other points in Georgia, etc.)
Development dynamics of local atmospheric processes and thermodynamic state of the atmosphere
No full textá¡á¢áá¢ááášá áááá®ááá£ááá áááááá£á á áá¢ááá¡á€áá á£áá áá ááªáá¡áááá¡ áááááááá áááá¡ áááááááá ARL READY-áá¡ áá¢ááá¡á€áá áá¡ ááá áááááááááá£á á ááááááá ááááá¡ ááá®áá¡áááááááááá áá ááá®áááá¡ ááá¢ááá áááááá£á á á áááá áá áááŠááá£á á áááá£á áááááªáááá á£á áááá áášáááá áááá¡ áááááááá. ášáá¡á¬ááááá áá¥áá áá¡ ášáááá®áááááá á áááá¡á᪠ááŠááá¡ááááá á¡áá¥áá áááááášá áááááá á°á¥áááá á¡áášááš ááá¢ááá áááááá£á ááááááááá¡ (áááá¡á®áá á¬áááá, á¡áá¢á§áá) 2015-18 á¬áááášá. ááŠááá©ááá, á áá á§áááá ášáá¡á¬ááááá ášáááá®ááááá¡áááá¡ ARL READY á¡áá¡á¢áááá¡ áá ááááá áááááá¡ áááá áááá¡ ááá®áá¡áááááááá CAPEâáá¡ á ááªá®áááá áááášááááááááá áá§á ááá¥á¡ááááá£á á 09:00-15:00 UTC áá ááá¡ ášá£ááááášá, á ááªá áááááááá¡ áááŠááá á¢ááááá áá¢á£á áá¡ áááá á®ááá¡áá§á ááá ááá ááááá áá¥ááááááá áááááá¥áªáá£á á áá ááªáá¡áááá¡ áááááááá áááá¡áááá¡.The article discusses the dynamics of the development of local atmospheric processes the thermodynamic state characteristics of the ARL READY atmosphere, and the analysis of mutual comparison of real data obtained with Kakheti meteorological radar. In order to confirm the results obtained, the cases were studied when in Eastern Georgia in 2015-2018 severe weather phenomena (rain, hail) took place. It was found that for all the studied cases, the numerical values of the CAPE characteristic of the energy instability of the ARL READY system were maximum, from 09:00 to 15:00 UTC, when due to the high temperature of the soil, favorable conditions were created for the development of convection processes
A New Scheme for High-Intensity Laser-Driven Electron Acceleration in a Plasma
No full textWe propose a new approach to high-intensity relativistic laser-driven electron acceleration in a plasma. Here, we demonstrate that a plasma wave generated by a stimulated forward-scattering of an incident laser pulse can be in the longest acceleration phase with injected relativistic beam electrons. This is why the plasma wave has the maximum amplification coefficient which is determined by the acceleration time and the breakdown (overturn) electric field in which the acceleration of the injected beam electrons occurs. We must note that for the longest acceleration phase the relativity of the injected beam electrons plays a crucial role in our scheme. We estimate qualitatively the acceleration parameters of relativistic electrons in the field of a plasma wave generated at the stimulated forward-scattering of a high-intensity laser pulse in a plasma
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UDCIn the Earth atmosphere there are often observed non-periodical, non-ordinary air phenomenal events which are accompanying with material and even human damage. Such kind atmosphere phenomenal events may be: powerful wind vortex, strong local mi-cro-orographic winds, different arising air currents in the atmosphere lower boundary layer and constantly dominated some re-gional geophysical âphenomenalâ events. Over the territory of Georgia such kind of âphenomenalâ events are observed over Da-vid Gareji depression and Surrami mountain plateau. In the present article on the bases of the hydrothermodynamic laws above mentioned phenomena is investigated. Namely it was proved that pressure in the wind vortex is arising proportionally with relief altitude and enlarged with augmentation of the angle between wind vortex axes and vertical direction. Also it was obtained that vertical component of the wind vortex was arising with altitude and it has exponential character. Obtained results are new and have as theoretical as well practical values.РаÑЌПÑÑеÑе ÐеЌлО ÑаÑÑП МаблÑЎаÑÑÑÑ ÐœÐµÐ¿ÐµÑОПЎОÑеÑкОе, МеПÑЎОМаÑÐœÑе ÑвлеМОÑ, кПÑПÑÑе ÑПпÑПвПжЎаÑÑÑÑ Ñ ÐŒÐ°ÑеÑОалÑ-ÐœÑЌО О Ўаже ÑелПвеÑеÑкОЌО жеÑÑваЌО. СÑеЎО ÑакОÑ
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