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Electrochemical Behavior of Co-Cr alloy in Neutral Solution
Ryouji Suzuki,Kazuhiko Noda,Yusuke Tsutsumi,Takao Hanawa 한국표면공학회 2010 한국표면공학회 학술발표회 초록집 Vol.2010 No.11
The Co-Cr alloys which have an excellent mechanical property and corrosion resistance are known as one of the most important metallic biomaterials. In this study, the electrochemical behavior of Co-Cr alloy in deaerated different electrolytes was investigated by using polarization curve measurements. Ti and stainless steels (Type 316) were used as a comparing material. The Co-Cr alloy has high corrosion resistance compared with the stainless steel in NaCl solution. The current increasing with the pitting corrosion was appeared in polarization curves of stainless steels. But it was disappeared in polarization curves of Co-Cr alloy. The passive state of the Co-Cr alloys was kept even in the pitting region of the case of stainless steels. The passive film on the Co-Cr alloy is stable as same as the film on Ti. According to the polarization behavior, the Co-Cr alloys are expected to use as the biomaterials.
MBE Growth of ZnSe Films on Lattice-Matched InxGa1-xAs Substrates
Takashi KARITA,Kazuhiko Suzuki,Takayuki SAWADA,Kazuaki IMAI,Satoru SETO 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.1
Raman scatering of ZnSe layers grown on nearly latice matched InxGa1-xAs substrates (x = 0 -0.092) by using molecular beam epitaxy (MBE) have ben investigated. The Raman shift of the ZnSe longitudinal optical (LO) phonon stays nearly constant while the line width Γ increases with increasing indium molar fraction of the substrates. The results are analyzed based on the two-parameter spatial corelation model. The intrinsic line width of ZnSe LO is found to depend strongly on the spatial corelation length of the substrate.
정은경,김경식,Mitsuo Suzuki,Kazuhiko Uemura 한국지질과학협의회 2012 Geosciences Journal Vol.16 No.2
The paleofloral change from the Aniai-type to the Daijima-type during the Miocene is the most distinctive and representative one of the six floral changes in the Japanese Archipelago during the Tertiary. These floral types are based mainly on compressed or imprinted leaf fossils. In Korea, the transition-type between the Aniai- and Daijima-type floras has been proposed based on the fossil wood assemblages, and the Hatamura Formation, which is the same age as the Daijima Formation, has yielded abundant fossil woods. To confirm whether the fossil wood assemblages are in agreement with the paleofloras inferred from fossil leaves, the fossil woods from the Hatamura Formation were studied. We found that warm temperate and daijiman elements, such as Keteleeria, Taxodioxylon cunninghamioides, T. sequoianum and Pinus, were present in the Hatamura Formation. Therefore, it can be concluded that the fossil wood types from the Hatamura Formation agree well with the Daijima-type Flora. This result, in turn, verifies the existence of transitional flora between the Aniai- and Daijima-types in Northeastern Asia
Masahiro Yoneda,Nao Suzuki,Akie Fujimoto,Yosuke Masuo,Kazuhiko Yamada,Hiromitsu Morita,Chihiro Koga,Takao Hirofuji 대한예방치과학회 2015 International Journal of Clinical Preventive Denti Vol.11 No.2
Objective: In December 2011, Fukuoka Dental College (FDC) established a satellite dental hospital: the Center for Oral Diseases (COD). One of the purposes of the COD was to acquire a sufficient number of patients for the clinical training of dental students. The purpose of this study was to evaluate patients’ acceptance of treatment by dental students at FDC and the COD, and to identify factors that may predispose patients to non-acceptance of treatment by dental students. Methods: We questioned all new patients on their acceptance of receiving dental treatment performed by dental students, and their answers were recorded. We then compared the degree of acceptance between FDC and the COD. Results: The degree of non-acceptance was significantly higher in the COD patients. Furthermore, both female and halitosis patients displayed a higher degree of non-acceptance. When halitosis patients were excluded, the degree of acceptance did not differ significantly between the two hospitals. Conclusion: There may be many reasons for patient non-acceptance of dental treatment performed by students. However, halitosis patients were found to be more nervous on being treated or observed by students. Based on these results, the COD may be able to serve as an effective student training dental hospital if halitosis patients are excluded from the clinical training course.