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井上 昭雄 / 自然科学編117
銀河からの電離光子脱出率の進化と宇宙再電離
<著者名>  井上 昭雄
<発行年月> 2006年02月
<ISSN> 0287-1394
<概要表示>
We have known that the universe was once neutralized in the epoch of 380,000 years following the BigBang. However, the present universe is almost entirely ionized. The universe was ionized again during its evolution. This cosmic re-ionization is one of the great problems remaining in cosmology. Recent observations are showing the shart and completion epochs of the reionization process. However, we do not know what sources ionized the universe. Distant forming galaxies have been suggested as a candidate for the ionizing sources. Here, we discuss the galactic emissivity of ionizing photons. Based on our observations constraining the ionizing photon flux from distant galaxies, we propose a new idea, cosmic evolution of the escape fraction of ionizing photons from galaxies, and we discuss its implications for the cosmic reionization
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竹内 康滋 / 自然科学編117
マインドの数理的解明
<著者名>  竹内 康滋
<発行年月> 2006年02月
<ISSN> 0287-1394
<概要表示>
 The mind is researched in the many field, such as psychology, philosophy, and linguistics. It has been an eternal subject although it has been inquired. This research is on the mind which is clarified in mathematical principle. Methodology is as follows. Two mathematics Theory is considered. For the point that the two theories differ, one side has a relation to the mind but another side does not have the relation. The difference between these two mathematics theories is only this point. It is a mathematical target about the point that these two mathematics theories differ. This mathematical description turns into a mathematical description of the mind.
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福田 和悟 / 自然科学編117
Ba(PO3)2:Euの熱蛍光特性
<著者名>  福田 和悟
<発行年月> 2006年02月
<ISSN> 0287-1394
<概要表示>
 Thermoluminescence (TL) in sintered Ba(PO3)2 doped with activators, such as Tm3+, Eu3+ and also Pb2+ ions has been studied for UV and X-ray irradiations. It was found that the TL intensity from the sintered Ba(PO3)2 doped with Eu2O3 was the highest among the samples doped other activators for UV irradiation, and on the other hand the intensity of sample doped with PbO was the highest for X-ray irradiation. And it was also found that the sample doped with 3 wt % CaF2 and 0.2 wt % EuCl3 showed about five times more intense the TL peaks than the sample doped only with Eu2O3 for UV irradiation. The TL peaks were observed at about 184℃ and 239℃ in Ba (PO3)2 doped with CaF2 and EuCl3. The TL emission may be due to the recombination reaction; Eu3++ electron →Eu2+*→Eu2+ +hν
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市原 一裕 / 自然科学編117
BOUNDS ON BOUNDARY SLOPES FOR KNOTS
<著者名>  市原 一裕
<発行年月> 2006年02月
<ISSN> 0287-1394
<概要表示>
In this research note, a number of bounds on boundary slopes of essential surfaces embedded or immersed in 3-manifolds are presented. Also reports on computer-aided experiments, concerning embedded boundary slopes for Montesinos knots, are included.
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