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CLASSIFICATION SCHEMES AND PROPERTIES OF INFRARED GALAXIES
Rybka, P.,Pollo, A.,Takeuchi, T.T. The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
We established a separation scheme to distinguish galaxies from stars with the aid of AKARI/FIS color-color (CC) diagrams. In all the combinations of CC diagrams we can distinguish two separate clouds. It was shown that in all cases one of them contains more than 95% of galaxies and the other one, in most cases, consists in more than 80% of stars (Pollo et al., 2010). Currently we are looking into more detailed classifications. We are especially interested in separating different morphological types of galaxies, mainly within spiral galaxies. Moreover, we study the properties of infrared galaxies.
Radiation-induced transformation of Hafnium composition
Alexander Ulybkin,Alexander Rybka,Konstantin Kovtun,Vladimir Kutny,Victor Voyevodin,Alexey Pudov,Roman Azhazha 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.8
The safety and efficiency of nuclear reactors largely depend on the monitoring and control of nuclear radiation. Due to the unique nuclear-physical characteristics, Hf is one of the most promising materials for the manufacturing of the control rods and the emitters of neutron detectors. It is proposed to use the Compton neutron detector with the emitter made of Hf in the In-core Instrumentation System (ICIS) for monitoring the neutron field. The main advantages of such a detector in comparison the conventional b-emission sensors are the possibility of reaching of a higher cumulative radiation dose and the absence of signal delays. The response time of the detection is extremely important when a nuclear reactor is operating near its critical operational parameters. Taking Hf as an example, the general principles for calculating the chains of materials transformation under neutron irradiation are reported. The influence of 179m1Hf on the Hf composition changing dynamics and the process of transmutants’ (Ta, W) generation were determined. The effect of these processes on the absorbing properties of Hf, which inevitably predetermine the lifetime of the detector and its ability to generate a signal, is estimated.
SQUID-Based Microwave Cavity Search for Dark-Matter Axions
Asztalos, S. J.,Carosi, G.,Hagmann, C.,Kinion, D.,van Bibber, K.,Hotz, M.,Rosenberg, L. J,Rybka, G.,Hoskins, J.,Hwang, J.,Sikivie, P.,Tanner, D. B.,Bradley, R.,Clarke, J. American Physical Society 2010 Physical Review Letters Vol.104 No.4
<P>Axions in the microeV mass range are a plausible cold dark-matter candidate and may be detected by their conversion into microwave photons in a resonant cavity immersed in a static magnetic field. We report the first result from such an axion search using a superconducting first-stage amplifier (SQUID) replacing a conventional GaAs field-effect transistor amplifier. This experiment excludes KSVZ dark-matter axions with masses between 3.3 microeV and 3.53 microeV and sets the stage for a definitive axion search utilizing near quantum-limited SQUID amplifiers.</P>