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Real-Time, in Situ Monitoring of the Oxidation of Graphite: Lessons Learned
Morimoto, Naoki,Suzuki, Hideyuki,Takeuchi, Yasuo,Kawaguchi, Shogo,Kunisu, Masahiro,Bielawski, Christopher W.,Nishina, Yuta American Chemical Society 2017 Chemistry of materials Vol.29 No.5
<P>Graphite oxide (GO) and its constituent layers (i.e., graphene oxide) display a broad range of functional groups and, as such, have attracted significant attention for use in numerous applications. GO is commonly prepared using the 'Hummers method' or a variant thereof in which graphite is treated with KMnO4 and various additives in H2SO4. Despite its omnipresence, the underlying chemistry of such oxidation reactions is not well understood and typically affords results that are irreproducible and, in some cases, unsafe. To overcome these limitations, the oxidation of graphite under Hummers-type conditions was monitored over time using in situ X-ray diffraction and in situ X-ray absorption near edge structure analyses with synchrotron radiation. In conjunction with other atomic absorption spectroscopy, UV vis spectroscopy and elemental analysis measurements, the underlying mechanism of the oxidation reaction was elucidated, and the reaction conditions were optimized. Ultimately, the methodology for reproducibly preparing GO on large scales using only graphite, H2SO4 and KMnO4 was developed and successfully adapted for use in continuous flow systems.</P>
SINGLE-CHIP IMPLEMENTATION OF MPEG2 DECODER DEDICATED TO MP@HL
Masaki,Toshihiro,Morimoto,Yasuo,Sato,Yoh,Onoye,Takao,Shirakawa,Isao 대한전자공학회 1995 ICVC : International Conference on VLSI and CAD Vol.4 No.1
A single-chip MPEG2 decoder dedicated to MP@HL is described, which consists of specific functional units, macroblock level pipeline buffers, and sequence controller. Owing to the sophisticated I/O interface facilities among functional units, macroblock level pipeline buffers are successfully incorporated with functional units. A new organization for frame memory and its interface is also devised. The designed decoder contains K transistors, and occupies 81.0㎟ with a 0.6㎛ triple-metal CMOS technology.
Gene Expression Profiling for Toxicological Assessment of Manufactured Nanoparticles in Rat Lung
Katsuhide Fujita,Yasuo Morimoto,Akira Ogami,Toshihiko Myojyo,Isamu Tanaka,Manabu Shimada,Wei-Ning Wang,Shigehisa Endoh,Kunio Uchida,Hiroaki Tao,Masaharu Inada,Tetsuya Nakazato,Moritaka Tamura,Kazuhiro 환경독성보건학회 2008 한국독성학회 심포지움 및 학술발표회 Vol.- No.-
Tsuda, Tohru,Morimoto, Yasuo,Yamato, Hiroshi,Fujino, Akihiro,Hori, Hajime,Kido, Masamitsu,Higashi, Toshiaki,Tanaka, Isamu 가톨릭대학교 산업의학센터 2001 韓國의 産業醫學 Vol.40 No.1
The primary concern of our study is to elucidate the development and pathophysiological mechanisms of occupational and environmental lung disease. The results of these studies are applied in the field of occupational health. Therefore, particular focuses are; 1) To introduce molecular-biomarkers into the risk assessment system of occupational exposed particles, 2) To apply molecular-biomarkers into conventional research methods, for the purpose of preventing and detecting early effects caused by occupational exposure to particles. Among fibrous materials, asbestos has been shown to cause diseases such as asbestosis, lung cancer and mesothelioma. On the other hand, there are many industries utilizing asbestos because of the many advantages as an industrial resource. The attempt to replace asbestos by man-made mineral fibres (MMFs) is fast in making progress because the industrial and economic gains are becoming certain. MMFs are thought to possess the same adverse biological effects as asbestos because of their similar physiochemical properties. Current data are now available showing that the new MMFs are not all nuisance particulate. No epidemiological studies are involving MMFs, and the results of animal studies on the adverse effects of MMFs are conflicting. Moreover, the toxic potentials of MMFs developed most are recently not always understood. Asia is a region which depends heavily on industrial development to sustain its growing population. Risk assessment of MMFs is a justifiable strategy to adopt particularly in this region. We have been constructing the risk assessment system of MMFs along following steps: study of physicochemical properties (1), in vitro study, intratracheal instillation study and acute to chronic inhalation study. We have compared the results of these steps with individual step and reached the final decision of toxicity to human. On the other hand, lung is one of the most important organ that is directly contact with the work environment. For this reason, factors concerning pathogenesis of occupational or work-related lung disease would be multiple. Thus, evaluating the environmental factors including smoking are also important.