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1968년 ~ 2024년까지 1,211 건의 한국천문학회지를 격월간 확인하실 수 있습니다.
- The Korean Astronomical Society (The Korean Astronomical Society)
- 계간 (Quarterly)
- ISSN : 1225-4614 (ISSN : 1225-4614)
1225-4614
- DB구축현황 : 1,211건 (DB Construction : 1,211 Articles)
총 게시글 1,211건
페이지 83/122
821
- CHAKRABARTI SANDIP K.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.281-282
- 1996
- 원문 바로보기
822
- HAN WONYONG
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.389-390
- 1996
- 원문 바로보기
The CCDs are widely used in astronomical observations either in direct imaging use or spectroscopic mode. However, the areas of available sensors are too small for large imaging format. One possibility to obtain large detection area is to assemble mosaics of CCD, and drive them simultaneously. Parallel driving of many CCDs together rules out the possibility of individual tuning; however, such optimisation is very important, when the ultimate low light level performance is required, particularly for new, or mixed devices. In this work, a new concept is explored for an entirely novel approach, where the drive waveforms are multiplexed and interleaved. This simultaneously reduces the number of leadout connections and permits individual optimisation efficiently. The digital controller can be designed within a single EPLD (Erasable Programmable Logic Device) chip produced by a CAD software package, where most of the digital controller circuits are integrated. This method can minimise the component. count., and improve the system efficiency greatly, based on earlier works by Han et a1. (1996, 1994). The system software has an open architecture to permit convenient modification by the user, to fit their specific purposes. Some variable system control parameters can be selected by a user with a wider range of choice. The digital controller design concept allows great flexibility of system parameters by the software, specifically for the compatibility to deal with any number of mixed CCDs, and in any format, within the practical limit.
823
- KASINSKY V. V.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.315-316
- 1996
- 원문 바로보기
Based on X-ray (1-8 <TEX>${\AA}$</TEX>) flux data for 1972-1995 the integral spectra of solar flare energy were computed. It has been shown that the spectral index <TEX>$\beta$</TEX> of the integral energy spectrum (IES) vanes systematically with the 11-year cycle phase. The interval of <TEX>$\beta$</TEX>-variations (0.47 <<TEX>$\beta$</TEX><1) is characteristic of UV-Cet stars. The maximum energy of the X-ray flares does not exceed <TEX>$10^{32}$</TEX> erg.
824
- MARKELOV S. V.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.387-388
- 1996
- 원문 바로보기
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.
825
- LA DAIL
- Journal of the Korean astronomical society = 천문학회지
- 29, n.2
- pp.83-91
- 1996
- 원문 바로보기
We present a model that rotating primordial blackholes(PBHs) produced at the end of inflation generate the random, non-oriented primordial magnetic field. PBHs are copiously produced as the Universe completes the cosmic phase transition via bubble nucleation and tunneling processes in the extended inflation hypothesis. The PBHs produced acquire angular momentum through the mutual tidal gravitational interaction. For PBHs of mass less than 1013g, one can show that the evaporation (photon) luminosity of PBHs exceeds the Eddington limit. Thus throughout the lifetime of the rotating PBH, radiation flow from the central blackhole along the Kerr-geodesic exerts torque to ambient plasma. In the process similar to the Bierman's battery mechanism electron current reaching up to the horizon scale is induced. For PBHs of Grand Unified Theories extended inflation with the symmetry breaking temperature of <TEX>$T_{GUT}\;\~\;10^{10}$</TEX> GeV, which evaporate near decoupling, we find that they generate random, non-oriented magnetic fields of <TEX>$\~10^{-11}G$</TEX> on the last-scattering surface on (the present comoving) scales of <TEX>$\~O(10)Mpc$</TEX>.
826
- SUNG EON-CHANG
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.87-88
- 1996
- 원문 바로보기
827
- HUANG KELIANG
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.105-106
- 1996
- 원문 바로보기
In this paper, we present observations of absorption line spectrum of QSO 1225+317 with resolution of 18 km <TEX>$sec^{-1}$</TEX>. Four possible new heavy element line systems are identified. The properties of Lyman <TEX>$\alpha$</TEX> forest lines are discussed.
828
- TOHMURA ICHIROH
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.321-322
- 1996
- 원문 바로보기
Using the data on the occurrences of the Ho: and soft X-ray flares for the time interval of January 1, 1986-May :31, 1994, we have studied the middle term(30-300days) pericities of the solar flare production during the activity cycle 22. Power analysis of the time seies of daily H<TEX>$\alpha$</TEX> flare index in the northern hemisphere shows prominent periodicities at 220, 120, 109, and 92 days(see Figures l(a) and l(b)), while in the southern hemisphere, those at 267, 213, 183, 167, and 107 days are apparent, though their peaks are not so distint as those in the northern hemisphere. Periodogram of daily soft X-ray flare index also reveal the periodicities at 279, 205, 164, 117, and 91 days in the northern hemisphere, and at 266, 220, 199, 162, 120, and 100 days in the southern hemisphere. Howeer, the 155-day periodicity reported for the earlier cycles, 19, 20, and 21, could not be confirmed in our analysis. to be submitted to Solar Physics; an extended abstract.
829
- BABADZHANOV P. B.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.359-361
- 1996
- 원문 바로보기
830
- CHANG KYONG-AE
- Journal of the Korean astronomical society = 천문학회지
- 29, n.1
- pp.1-8
- 1996
- 원문 바로보기
When we follow the lines of the trajectory of photons which intersect the circle, the circle may suffer some deformation as approaching to the observer. We consider an infinitesimal light bundle suffering gravitational bending. We examine the deformation of the deflected light bundle due to the gravitational lens. The size of the deformation is expressed in terms of the focal length of the gravitational lens.