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CCD CONTROLLERS FOR THE 6-M TELESCOPE OF RAS WITH IMPROVED ACCURACY OF SIGNAL PROCESSING
MARKELOV S. V.,MURZIN V. A.,IVASHCHENKO N. G.,AFANASIEVA I. V.,BORISENKO A. N. The Korean Astronomical Society 1996 Journal of The Korean Astronomical Society Vol.29 No.suppl1
The principles to attain improved accuracy in a new controller for large CCD and mosaics detectors with the application of 16- and 32-bit DSP are presented.
Markelov, A.,Valikov, A.,Chepikov, V.,Petrzhik, A.,Massalimov, B.,Degtyarenko, P.,Uzkih, R.,Soldatenko, A.,Molodyk, A.,Sim, Kideok,Hwang, Soon The Korea Institute of Applied Superconductivity a 2019 한국초전도저온공학회논문지 Vol.21 No.4
2G HTS wire with high engineering current density is desired for applications where compact, high power density superconducting equipment is important. We have succeeded in enhancing engineering current density of commercial SuperOx 2G HTS wire based on GdBCO by increasing the HTS layer thickness without fast degradation of the HTS film microstructure. This was possible after improving the temperature uniformity along the HTS film deposition zone. In particular, the wire engineering current density was increased from 700-770 A/㎟ (for a 65 ㎛-thick wire without stabilisation) or 430-480 A/㎟ (for a 105 ㎛-thick stabilised wire) at the beginning of this study to almost 1200 A/㎟ (for a 67 ㎛-thick wire without stabilisation) or 770 A/㎟ (for a 107 ㎛-thick stabilised wire) at completion of this study.
A. Molodyk,A. Markelov,A. Valikov,V. Chepikov,A. Petrzhik,B. Massalimov,P. Degtyarenko,R. Uzkih,A. Soldatenko,Kideok Sim,Soon Hwang 한국초전도.저온공학회 2019 한국초전도저온공학회논문지 Vol.21 No.4
2G HTS wire with high engineering current density is desired for applications where compact, high power density superconducting equipment is important. We have succeeded in enhancing engineering current density of commercial SuperOx 2G HTS wire based on GdBCO by increasing the HTS layer thickness without fast degradation of the HTS film microstructure. This was possible after improving the temperature uniformity along the HTS film deposition zone. In particular, the wire engineering current density was increased from 700-770 A/mm2 (for a 65 µm-thick wire without stabilisation) or 430-480 A/mm2 (for a 105 µm-thick stabilised wire) at the beginning of this study to almost 1200 A/mm2 (for a 67 µm-thick wire without stabilisation) or 770 A/mm2 (for a 107 µm-thick stabilised wire) at completion of this study.
DELAYED HYDRIDE CRACKING IN ZIRCALOY FUEL CLADDING - AN IAEA COORDINATED RESEARCH PROGRAMME
Coleman, C.,Grigoriev, V.,Inozemtsev, V.,Markelov, V.,Roth, M.,Makarevicius, V.,Kim, Y.S.,Ali, Kanwar Liagat,Chakravartty, J.K.,Mizrahi, R.,Lalgudi, R. Korean Nuclear Society 2009 Nuclear Engineering and Technology Vol.41 No.2
The rate of delayed hydride cracking (DHC), V, has been measured in cold-worked and stress-relieved Zircaloy-4 fuel cladding using the Pin-Loading Tension technique. At $250^{\circ}C$ the mean value of V from 69 specimens was $3.3({\pm}0.8)x10^{-8}$ m/s while the temperature dependence up to $275^{\circ}C$ was described by Aexp(-Q/RT), where Q is 48.3 kJ/mol. No cracking or cracking at very low rates was observed at higher temperatures. The fracture surface consisted of flat fracture with no striations. The results are compared with previous results on fuel cladding and pressure tubes.
Innovative technologies for spent fuel safe management at Ignalina channel-type reactors
Egidijus Babilas,Pavel Dokucajev,Darius Janulevicius,Aleksej Markelov,Raimondas Pabarcius,Sigitas Rimkevicius,Eugenijus Uspuras,Mindaugas Vaisnoras 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.3
In Lithuania, all spent nuclear fuel (SNF) resulted from the operation of the Ignalina Nuclear Power Plant(INPP), which had two Russian Acronym for “Channelized Large Power Reactor”-type reactors. After thefinal shutdown, the total amount of SNF at the INPP was approximately 22,000 fuel assemblies. All theseassemblies will be stored for about 50 years and disposed of after that. The decision to shut down anddecommission both reactors in Lithuania before termination of design period raises a significant challengefor the treatment of accumulated SNF. Therefore, various techniques and technologies for SNFmanagement were developed and justified for that specific case, and a set of special equipment wasinstalled at the INPP, the effectiveness of which was demonstrated during its operation. This articlepresents unique techniques related to the management of SNF adopted and commissioned at the INPPafter its operation shutdown, namely fuel rod cladding leak tightness control system and specialequipment for collection of possible spillage during handling of SNF assembly in the hot cell. Theoperational experience and measurement results of fuel rod cladding leak tightness control system arepresented.
DELAYED HYDRIDE CRACKING IN ZIRCALOY FUEL CLADDING – AN IAEA COORDINATED RESEARCH PROGRAMME
C. COLEMAN,V. GRIGORIEV,V. INOZEMTSEV,V. MARKELOV,M. ROTH,V. MAKAREVICIUS,Y. S. KIM,KANWAR LIAGAT ALI,J.K. CHAKRAVARTTY,R. MIZRAHI,R. LALGUDI 한국원자력학회 2009 Nuclear Engineering and Technology Vol.41 No.2
The rate of delayed hydride cracking (DHC), V, has been measured in cold-worked and stress-relieved Zircaloy-4 fuel cladding using the Pin-Loading Tension technique. At 250 °C the mean value of V from 69 specimens was 3.3(±0.8)x10⁻⁸ m/s while the temperature dependence up to 275 °C was described by Aexp(-Q/RT), where Q is 48.3 kJ/mol. No cracking or cracking at very low rates was observed at higher temperatures. The fracture surface consisted of flat fracture with no striations. The results are compared with previous results on fuel cladding and pressure tubes.
항복강도에 따른 Zr-2.5Nb 압력관의 Delayed Hydride Cracking Velocity
김영석,최승준,정용무,김인섭,마르켈로프 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.1
The objective of this study is to investigate delayed hydride cracking velocity (DHCV) of Zr-2.5Nb pressure tubes with yield strength. DHC tests were conducted at an initial K_(I) of 15 to 19 MPa √m and 250℃ on the compact tension specimens containing up to 100 ppm hydrogen that were taken from the Zr-2.5Nb tubes with different yield strengths. The crack growth was determined with the direct current potential drop method. A nice correlation of the DHC velocity and the yield strength was obtained at all temperatures by normalizing the DHCV with the terminal solid solubility and diffusion of hydrogen: the DHCV increased exponentially with increased yield strength of the Zr- 2.5Nb tubes. In contrast, the texture and the distribution of the β-Zr phase were found to have a comparatively minor effect on the DHCV of the Zr-2.5Nb tubes. Yield strength of the Zr-2.5Nb tubes determines a plastic zone size with a steep gradient of hydrogen concentration ahead of the crack tip where hydrides can be precipitated. The yield strength effect is analyzed by correlating the plastic zone and the striation spacing observed on the fractured surfaces as a function of the yield strength.
항복강도에 따른 Zr-2.5Nb 압력관의 Delayed Hydride Cracking Velocity
김영석(Kim Young Suk),정용무(Cheong Yong Moo),임경수(Im Kyung Soo),김인섭(Kim In Sup),마르켈로프(V. Markelov) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.8
The objective of this study is to investigate the delayed hydride cracking velocity (DHCV) of Zr-2.5Nb pressure tubes with yield strength. DHC tests were conducted at an initial K₁ of 19 ㎫√m and 250℃ on the compact tension specimens containing 100 ppm hydrogen that were taken from the Zr-2.5Nb tubes with different yield strengths. The crack growth was determined with the direct current potential drop method. A nice correlation of the DHC velocity and the yield strength was obtained at all temperatures by normalizing the DHCV with the terminal solid solubility and diffusion of hydrogen: the DHCV increased exponentially with increased yield strength of the Zr-2.5Nb tubes. In contrast, the texture and the distribution of the β-Zr phase were found to have a comparatively minor effect on the DHCV of the Zr-2.5Nb tubes. Yield strength of the Zr-2.5Nb tubes determines a plastic zone size with a steep gradient of hydrogen concentration ahead of the crack tip where hydrides can be precipitated. The yield strength effect is discussed by correlating the plastic and the striation spacing observed on the fractured surfaces as a function of yield strengths.