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Radiation effect on the polymer-based capacitive relative humidity sensors
Shchemerov I.V.,Legotin S.A.,Lagov P.B.,Pavlov Y.S.,Tapero K.I.,Petrov A.S.,Sidelev A.V.,Stolbunov V.S.,Kulevoy T.V.,Letovaltseva M.E.,Murashev V.N.,Konovalov M.P.,Kirilov V.N. 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.8
The sensitivity of polymer-based capacitive relative humidity (RH) sensors after irradiation with neutrons, electrons and protons was measured. Degradation consists of the decreasing of the upper RH limit that can be measured. At the same time, low RH-level sensitivity is almost stable. After 30 krad of absorption dose, RH cut off is equal to 85% of max value, after 60 krade40%. Degradation reduces after annealing which indicates high radiation sensitivity of the internal circuit in comparison to RH-sensing polymer film
KTM Tokamak Operation Scenarios Software Infrastructure
V. PAVLOV,K. BAYSTRUKOV,YU. GOLOBOKOV,A. OVCHINNIKOV,A. MEZENTSEV,S. MERKULOV,A. LEE,I. TAZHIBAYEVA,G. SHAPOVALOV 한국원자력학회 2014 Nuclear Engineering and Technology Vol.46 No.5
One of the largest problems for tokamak devices such as Kazakhstan Tokamak for Material Testing (KTM) is theoperation scenarios’ development and execution. Operation scenarios may be varied often, so a convenient hardwareand software solution is required for scenario management and execution. Dozens of diagnostic and control subsystemswith numerous configuration settings may be used in an experiment, so it is required to automate the subsystemconfiguration process to coordinate changes of the related settings and to prevent errors. Most of the diagnostic andcontrol subsystems software at KTM was unified using an extra software layer, describing the hardware abstractioninterface. The experiment sequence was described using a command language. The whole infrastructure was brought together by a universal communication protocol supporting various media,including Ethernet and serial links. The operation sequence execution infrastructure was used at KTM to carry outplasma experiments.
KTM TOKAMAK OPERATION SCENARIOS SOFTWARE INFRASTRUCTURE
Pavlov, V.,Baystrukov, K.,Golobokov, Yu.,Ovchinnikov, A.,Mezentsev, A.,Merkulov, S.,Lee, A.,Tazhibayeva, I.,Shapovalov, G. Korean Nuclear Society 2014 Nuclear Engineering and Technology Vol.46 No.5
One of the largest problems for tokamak devices such as Kazakhstan Tokamak for Material Testing (KTM) is the operation scenarios' development and execution. Operation scenarios may be varied often, so a convenient hardware and software solution is required for scenario management and execution. Dozens of diagnostic and control subsystems with numerous configuration settings may be used in an experiment, so it is required to automate the subsystem configuration process to coordinate changes of the related settings and to prevent errors. Most of the diagnostic and control subsystems software at KTM was unified using an extra software layer, describing the hardware abstraction interface. The experiment sequence was described using a command language. The whole infrastructure was brought together by a universal communication protocol supporting various media, including Ethernet and serial links. The operation sequence execution infrastructure was used at KTM to carry out plasma experiments.
Kochervinskii, V.V.,Chubunova, E.V.,Lebedinskii, Y.Y.,Pavlov, A.S.,Pakuro, N.I. Techno-Press 2015 Advances in materials research Vol.4 No.2
The phenomena of high-voltage polarization and conductivity in oriented vinylidenefluoride and tetrafluoroethylene copolymer films have been investigated. It was shown that under certain electric fields, injection of carriers from the material of electrodes appears The barrier for holes injection in the copolymer was found to be lower than that for electrons. It results in more effective screening of the external field near the anode than near cathode. Electrones, ejected from cathode, creating negative charge by trapping on the surface. It is shown that the electrons injected from cathodes create a negative homocharge on the copolymer surface and then become captured on the surface shallow traps. Their nature has been studied by the x-ray photoelectron spectroscopy. It was shown that these traps may consist of chemical defects in the form of new functional groups formed by reactions of surface macromolecules with sputtered atoms of aluminum. The asymmetric shape of hysteresis curves was explained by the difference in mobility of injected holes and electrons. These factors caused appearance of "non-closed" hysteresis curves for fluorine-containing polymer ferroelectrics. Hysteresis phenomena observed at low electric fields (below coercive ones) are to associate with the behavior of the domains localized in the ordered regions formed during secondary crystallization of copolymers.
The frequency effect on atmospheric pressure RF discharge surface modification
Heon-Ju Lee,A.F. Alexandrov,E.A. Kralkina,V.B. Pavlov,V.P. Savinov,V. Yu. Sergeenko,I.B. Timofeev,G.E. Bugrov,K.V. Vavilin,V. Yu. Plaksin,Young Son Mok 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.1
The physical mechanism of RF discharge at atmospheric pressure was studied at discharge frequencies of 13.56MHz and 0.6MHz. The discharge at 0.6 MHz had a clear filamentary structure, while discharge at 13.6 MHz had no separate filaments. The influence of discharge on the properties of polymer surfaces was also investigated, using two surface property indicators, the contact angle with water and adhesion strength. As a result of sample processing in the discharge, the wetting angle of polytetrafluorethylene (PTFE), polyethylene (PE), polyimide (PI) and polyvinyl chloride (PVC) decreased to 40o, 20o, 20o and 25o, respectively, and the adhesion of PTFE increased four fold. The physical mechanism of RF discharge at atmospheric pressure was studied at discharge frequencies of 13.56MHz and 0.6MHz. The discharge at 0.6 MHz had a clear filamentary structure, while discharge at 13.6 MHz had no separate filaments. The influence of discharge on the properties of polymer surfaces was also investigated, using two surface property indicators, the contact angle with water and adhesion strength. As a result of sample processing in the discharge, the wetting angle of polytetrafluorethylene (PTFE), polyethylene (PE), polyimide (PI) and polyvinyl chloride (PVC) decreased to 40o, 20o, 20o and 25o, respectively, and the adhesion of PTFE increased four fold.
Optimisation of cold cathode ion source model
G.E.Bugrov,S.K.Kondranin,E.A.Kralkina,V.B.Pavlov,D.V.Savinov,K.V.Vavilin,Heon-JuLee 한국물리학회 2003 Current Applied Physics Vol.3 No.6
This paper represents the results of the optimisation of cold cathode ion source model with 5 cm extraction aperture diameter. Inthis model, the glow discharge is utilised for generation of electrons in the cathode of the ion source. The various models withdierent lengths of cathode and anode are tested. The shortest model with 4.5 cm in length of cathode and anode each showssatisfactory operation and can be used in cases when the high values of extracted ion current are not required. The best model fromthe point of view of ion beam current value and eciency of the discharge is the model with cathode length of 7 cm and anode lengthof 7 cm. In this case, the obtained maximum ion beam current is 110 mA when the discharge current is 1000 mA. In case whenmoderate values of extracted ion beam current are necessary, it is possible to operate the ion source even without the anode magneticsystem.. 2003 Elsevier B.V. All rights reserved.
W. Furman,A. Baldin,A. Rogov,B. Guskov,E. Kostyukhov,I. Marin,M. Krivopustov,N. Gunddorin,N. Rebrova,S. Pavlov,V. Krasnov,V. Smirnov,A. Chinenov,B. Fonarev,M. Galanin,N. Ryazansiy,S. Solodchenkova,V. 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Prompt and delayed neutrons (DN) from pulsed irradiation of geometrically identical natural uranium and lead targets by 1 and 4 GeV deuterons were measured at NUCLOTRON facility of Joint Institute for Nuclear Research. The massive hexagonal shaped targets were surrounded by 10 cm lead blanket. Neutrons were measured by the assembly of ^3He counters embedded in moderator and by threshold activation detectors. The DN decay curves were analysed for both targets and information on fission properties for massive (∼315 kg) uranium target was extracted. The obtained experimental information could be useful for verification of INC and transport codes. The results of this experiment are important for development of advanced ADS systems and other applications.
Final report on international key comparison APMP.QM-K41: 10 µmol/mol hydrogen sulfide in nitrogen
Kim, Yong-Doo,Heo, Gwi-Suk,Lee, Sangil,Han, Qiao,Wu, Hai,Konopelko, Leonid A,Kustikov, Yury A,Malginov, Andrey V,Gromova, Elena V,Pankratov, Vladimir V,Pavlov, Mikhai V,Botha, Angelique Springer-Verlag 2014 METROLOGIA -BERLIN- Vol.51 No.-
<P>This report presents the results of APMP.QM-K41, a key comparison. This comparison is designed to test the capabilities of the NMIs to measure and certify hydrogen sulfide at a nominal amount fraction of 10 µmol/mol in nitrogen. This comparison provides an opportunity to the NMIs in APMP to submit supporting evidence for CMC at the same level as CCQM-K41. The results from this comparison are linked with CCQM-K41.</P><P>Main text.To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.</P><P>The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).</P>