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RISS 인기검색어
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- 저자 : Shûhei NOMURA (검색결과 2 건)
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Two pselaphine species (Coleoptera: Staphylinidae) new to Korea
김태규,Shûhei NOMURA,안기정 한국곤충학회 2010 Entomological Research Vol.40 No.3
Two pselaphine staphylinid species –Stipesa rudis Sharp and Tainochus nitidus Nomura – are identified for the first time in the Korean peninsula.
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Lee, Hyun-Taek,Kim, Ho-Jin,Kim, Chung-Soo,Gomi, Kenji,Taya, Minoru,Nomura, Shû,hei,Ahn, Sung-Hoon Elsevier 2017 Acta Biomaterialia: structure-property-function re Vol.57 No.-
<P><B>Abstract</B></P> <P>Biological materials are the result of years of evolution and possess a number of efficient features and structures. Researchers have investigated the possibility of designing biomedical structures that take advantage of these structural features. Insect shells, such as beetle shells, are among the most promising types of biological material for biomimetic development. However, due to their intricate geometries and small sizes, it is challenging to measure the mechanical properties of these microscale structures. In this study, we developed an in-situ testing platform for site-specific experiments in a focused ion beam (FIB) system. Multi-axis nano-manipulators and a micro-force sensor were utilized in the testing platform to allow better results in the sample preparation and data acquisition. The entire test protocol, consisting of locating sample, ion beam milling and micro-mechanical bending tests, can be carried out without sample transfer or reattachment. We used our newly devised test platform to evaluate the micromechanical properties and structural features of each separated layer of the beetle horn shell. The Young’s modulus of both the exocuticle and endocuticle layers was measured. We carried out a bending test to characterize the layers mechanically. The exocuticle layer bent in a brick-like manner, while the endocuticle layer exhibited a crack blunting effect.</P> <P><B>Statement of Significance</B></P> <P>This paper proposed an in-situ manipulation/test method in focused ion beam for characterizing micromechanical properties of beetle horn shell. The challenge in precise and accurate fabrication for the samples with complex geometry was overcome by using nano-manipulators having multi-degree of freedom and a micro-gripper. With the aid of this specially designed test platform, bending tests were carried out on cantilever-shaped samples prepared by focused ion beam milling. Structural differences between exocuticle and endocuticle layers of beetle horn shell were explored and the results provided insight into the structural advantages of each biocomposite structure.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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