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Preparation of BaTiO₃ Thin Films using Pulsed KrF Laser Deposition and in situ Laser Annealing
Akihiko Machida,Atsushi Ito,Minoru Obara 慶熙大學校 레이저 工學硏究所 1996 레이저공학 Vol.7 No.-
Barium titanate (BaTiO³) thin films have been fabricated on MgO substrate using a hybrid process of pulsed KrF laser deposition (PLD) and in situ laser annealing. By utilizing in situ excimer laser annealing, epitaxial films of 1 ㎛ thickness were successfully fabricated and its refractive index was close to that of the bulk crystal. Substrate temperature to fabricate epitaxial films was relatively low at 650℃, and smooth surface films were achieved with this method.
생태계 모형과 시공간 환경정보를 이용한 우리나라 식생 탄소 수지 추정
유성진 ( Seong Jin Yoo ),이우균 ( Woo Kyun Lee ),손요환 ( Yow Han Son ),( Akihiko Ito ) 대한원격탐사학회 2012 大韓遠隔探査學會誌 Vol.28 No.1
본 연구에서는 시공간 환경정보를 이용하여 VISIT(Vegetation Integrated Simulator for Trace gases)이라는 생태계 모형 구동하였고, 우리나라의 생태계 탄소 수지를 추정하였다. 모델 구동 결과, 모델은 시뮬레이션 기간인 총 10년 동안 연평균 총일차생산량(GPP)과 순일차생산량(NPP)을 각각 91.89 Tg C year-1, 40.16 Tg C year-1로 추정하였다. 그리고 이 기간 동안 우리나라의 식생 생태계는 연평균 3.51 Tg C year-1의 탄소를 흡수하는 역할을 수행한 것으로 추정되었다. 이를 우리나라의 인위적 탄소배출량 자료와 비교한 결과, 2007년 우리나라 식생 생태계는 탄소 흡수원으로서 인위적 탄소배출량의 3.3%를 상쇄시킨 것으로 나타났다. 향후 정확한 탄소수지 추정을 위해서는 신뢰성 있는 입력자료 구축과 다양한 연구 결과와의 비교를 통해 모델 변수의 보정이 필요하다. 하지만 본 연구의 결과는 기후변화 완화를 위한 생태계 관리 전략을 수립하는데 도움을 줄 것으로 생각된다. In this study, we simulated a carbon flux model, so called Vegetation Integrated Simulator for Trace gases (VISIT) using Spatio-temporal Environmental Information, to estimate carbon budgets of vegetation ecosystem in South Korea. As results of the simulation, the model estimated that the annual-average gross primary production (GPP), net primary production (NPP) for 10 years were 91.89 Tg C year-1, and 40.16 Tg C year-1, respectively. The model also estimated the vegetation ecosystems in South Korea as a net carbon sink, with a value of 3.51 Tg C year-1 during the simulation period, Comparing with the anthropogenic emission of South Korea, vegetation ecosystems offsets 3.3% of human emissions as a net carbon sink in 2007, To estimate the carbon budget more accurately, it is important to prepare reliable input datasets, And also, model parameters should be calibrated through comparing with various independent method, The result of this study, however, would be helpful for devising ecosystem management strategies that may help to mitigate global climate change.
Kaneko, Takaaki,Shimpo, Kan,Chihara, Takeshi,Beppu, Hidehiko,Tomatsu, Akiko,Shinzato, Masanori,Yanagida, Takamasa,Ieike, Tsutomu,Sonoda, Shigeru,Futamura, Akihiko,Ito, Akihiro,Higashiguchi, Takashi Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.5
High temperature- and pressure-treated garlic (HTPG) has been shown to have enhanced antioxidative activity and polyphenol contents. Previously, we reported that HTPG inhibited 1,2-dimethylhydrazine-induced mucin depleted foci (premalignant lesions) and $O^6$-methylguanine DNA adduct formation in the rat colorectum. In the present study, we investigated the modifying effects of HTPG on N-ethyl-N'-nitro-N-nitrosoguanidine (ENNG)-induced pyloric stomach and small intestinal carcinogenesis in mice. Male C57BL/6 mice were given ENNG (100 mg/l) in drinking water for the first 4 weeks, then a basal diet or diet containing 2% or 5% HTPG for 30 weeks. The incidence and multiplicity of pyloric stomach and small intestinal (duodenal and jejunal) tumors in the 2% HTPG group (but not in the 5% HTPG group) were significantly lower than those in the control group. Cell proliferation of normal-appearing duodenal mucosa was assessed by MIB-5 immunohistochemistry and shown to be significantly lower with 2% HTPG (but again not 5% HTPG) than in controls. These results in dicate that HTPG, at 2% in the diet, inhibited ENNG-induced pyloric stomach and small intestinal (especially duodenal) tumorigenesis in mice, associated with suppression of cell proliferation.
Pejchal, Jan,Babin, Vladimir,Beitlerova, Alena,Kucerkova, Romana,Panek, Dalibor,Barta, Jan,Cuba, Vaclav,Yamaji, Akihiro,Kurosawa, Shunsuke,Mihokova, Eva,Ito, Akihiko,Goto, Takashi,Nikl, Martin,Yoshika Elsevier 2016 Optical Materials Vol.53 No.-
<P><B>Abstract</B></P> <P>Ce-doped lutetium aluminum garnet Lu<SUB>3</SUB>Al<SUB>5</SUB>O<SUB>12</SUB> (LuAG) nanoceramics were fabricated at 1600°C and 1700°C by spark-plasma sintering (SPS) method from nano-powders prepared by radiation synthesis. Both undoped and Ce-doped LuAG ceramic samples were also prepared from the nano-powders at 1700°C with significantly increased pre-heating rate. The backscattered electron images revealed large amount of pores in all the Ce-doped samples causing their significant opacity. On the other hand, very large grains and no pores were revealed in the undoped sample, which was the only transparent one. The radioluminescence measurements revealed superior overall scintillation efficiency of the samples sintered at the temperature 1700°C, and their defect emission in the UV region was ascribed to oxygen-vacancy-related defects such as F<SUP>+</SUP> centers. The photoluminescence decay of the defect emission was characterized by an extremely fast decay time of a few nanoseconds. Influence of sintering procedure and subsequent annealing on the luminescence and scintillation properties is discussed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ce-doped scintillation nanoceramics were prepared by a Spark-Plasma-Sintering method. </LI> <LI> High overall scintillation efficiency was found. </LI> <LI> For samples prepared with slower pre-heating, scintillation efficiency can be increased by annealing. </LI> <LI> Higher sintering temperatures and slower pre-heating stages positively influence scintillation efficiency. </LI> </UL> </P>