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김아람,N. H. Lee,I. S. Hahn,J. S. Yoo,M. H. Han,S. Kubono,H. Yamaguchi,S. Hayakawa,Y. Wakabayashi,D. Binh,H. Hashimoto,T. Kawabata,D. Kahl,Y. Kurihara,Y. K. Kwon,T. Teranishi,S. Kato,T. Komatsubara,B. Gu 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.1
For the study of astrophysically important states in 18Ne, the 14O(α, α)14O cross section was measured in inverse kinematics using a radioactive 14O beam. This reaction was investigated for properties of resonant states of 18Ne for determining the 14O(α, p)17F reaction rate, which is one of the most important reactions for understanding the breakout mechanism from the Hot CNO cycle to the rp-process. Alpha-induced elastic scattering on 14O was performed using the lowenergy radioactive ion (RI) beam separator at the Center for Nuclear Study (CNS) in the RIKEN Accelerator Research Facility. The energy range Ex = 7.2 ∽ 13.1 MeV of 18Ne was scanned with the thick target method. Recoiled alpha particles were measured with Si dE-E telescopes. Spins and widths of three resonances at Ex = 8.6, 9.22, and 10.06 MeV were calculated using the R-matrix analysis, and a new state of 18Ne at Ex = 12.0 MeV was found in this experiment.
APPLICATION OF WHOLE BODY COUNTER TO NEUTRON DOSE ASSESSMENT IN CRITICALITY ACCIDENTS
Kurihara, O.,Tsujimura, N.,Takasaki, K.,Momose, T.,Maruo, Y. 대한방사선 방어학회 2001 방사선방어학회지 Vol.26 No.3
Neutron dose assessment in criticality accidents using Whole Body Counter(WBC) was proved to be an effective method as rapid neutron dose estimation at the JCO criticality acciedent in Tokai-mura. The 1.36MeV gamma-ray of 24Na in a body can be detected easily by a germanium detector. The minimum Detectable Activity(MDA) of 24Na is approximately 50Bq for 10miniute measurement by the germanium-type whole body counter at JNC Tokai Works. Neutron energy spectra at the typical shielding conditions in criticality accidents were calculated and the conversion factor, whole body activity-to-organ mass weighted neutron absorbed dose, corresponding to each condition were determined. The conversion factor for uncollied fission spectrum is 7.7[(Bq24Na/g23Na)/mGy].
Feeding Value of Sugarcane Stalk for Cattle
Kawashima, T.,Sumamal, W.,Pholsen, P.,Chaithiang, R.,Boonpakdee, W.,Kurihara, M.,Shibata, M. Asian Australasian Association of Animal Productio 2002 Animal Bioscience Vol.15 No.1
A metabolism trial with four castrated male Brahman cattle, average body weight 320 kg, was conducted in order to determine the nutritive value of chopped sugarcane stalk (CSS) for the establishment of feeding strategy in the dry season in Northeast Thailand. Animals were subjected to the following four dietary treatments: Treatment 1; 100% of CSS, Treatment 2; 70% of CSS and 30% of commercial complete feed (TMR), Treatment 3; 40% of CSS and 60% of TMR, and Treatment 4; 100% of TMR. The average CP, ether extracts, nitrogen free extracts, crude fiber and ash contents of CSS were 2.0, 0.9, 79.0, 16.1 and 2.2%, respectively. Although the amount of feed given was approximately at maintenance level, animals in treatments 1 and 2 refused a part of feed. The metabolism trial revealed that total digestible nutrient and metabolizable energy contents of CSS were 61.5% and 9.04 MJ/kgDM, respectively, when it was properly supplemented with protein sources. Nutritive value of CSS was lowered when animals were given CSS solely. This was due to the large loss of energy into urine and methane. Voluntary intake of CSS in cattle was not enough to satisfy energy requirement for maintenance. The CSS can be used as a roughage for feeding cattle in the dry season with proper supplementation of protein and energy.
Naoto Kurihara,Kunhua Fan,Howard T. Thaler,Kan Yang,Martin Lipkin 한국식품영양과학회 2008 Journal of medicinal food Vol.11 No.2
We previously reported hyperproliferation and hyperplasia in C57Bl/6 mouse mammary gland after feeding aWestern-style diet (WD); these findings decreased after supplementing WD with increased calcium and vitamin D3. We nowagain fortified WD with increased calcium and vitamin D3 from two sources: (1) a food source, calcium- and vitamin D3-en-riched yogurt (WDy diet) or (2) adding calcium and vitamin D3 directly to WD (WDCaD diet). After 6 months of feeding thenumber of mammary ducts was higher in mice consuming WD compared to WDy (216.0 vs. 202.7, P. .05) and WDCaD(216.0 vs. 194.9, P. .001). The percentage of small ducts increased in WD compared to AIN-76A controls (23.3% vs. 17.4%)but was lower in the WDy (17.1%) and WDCaD (14.8%) groups. WD mice had higher numbers of epithelial cells per ductthan WDy (33.2 vs. 27.4, P. .001) and WDCaD (33.2 vs. 27.8, P. .001) mice, and AIN-76A-fed mice had higher numbersthan WDy (31.1 vs. 27.4, P. .005) or WDCaD (31.1 vs. 27.8, P. .01) mice. Mitotic index was higher in WD than in WDCaD mice (0.0020 vs. 0.0009, P. .001). Thus, small mammary gland ductules and mitosis increased after feeding WDand decreased after supplementing the diets with increased calcium and vitamin D3, administered either in a dairy food (yo-gurt) or directly as calcium carbonate plus vitamin D3 in WD, suggesting further study of these nutrients for their possiblerelationship to breast cancer prevention.
Effect of Additive Elements on Electrochemical Behavior of Passive Films on Fe-18Cr Alloy
Fujimoto, S.,Umemura, H.,Kurihara, M.,Tsuchiya, H.,Shibata, T. 한국부식방식학회 2002 Corrosion Science and Technology Vol.31 No.1
Electrochemical behaviour of Fe-18Cr-X (X: Al, Si, Ti, Mn, Ni, Cu, Zr, Nb, Mo, and W, 0.5-4 at.%) alloy thin films deposited on Si wafer by ion beam sputtering technique was examined in order to discuss the effect of alloying elements which are completely dissolved in the alloy. Polarisation curves measured in 0.1 krnol m" H2S04 revealed that active dissolution was suppressed by Ni, Nb, Mo, Cu and Ti, but was almost not affected by Al, Si, Mn. Pitting corrosion resistance in acid chloride solutions was extremely improved by Nb, Mo, Ti. On the other hand, Al, Si, Mn exhibited almost no change in pitting potential. Reactivation in sulphuric acid was suppressed by Mo, Nb, Ni, Ti, but not affected or slightly enhanced by Si and Mn. It is noticeable that addition of Nb is especially beneficial for preventing both pitting corrosion and reactivation. The corrosion behaviour of Fe-Cr alloys are discussed in terms of the stability of passive film which is influenced by minute additives incorporated in the film.