Satoshi Koizumi

Ultraprecise anisotropy mapping of Young's modulus in single-crystal diamond via mechanical resonance

Zhaozong Zhang, Zilong Zhang, Wen Juan Zhao, Satoshi Koizumi et autres

The exceptional stiffness of diamond is strongly anisotropic due to its crystal structure, yet experimental quantification of Young's modulus along different orientations remains limited. Here, we present a direct measurement of elastic anisotropy in microwave plasma chemical vapor deposition (MPCVD) single-crystal diamond …

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Optical properties of single-crystal diamond MEMS: mitigating substrate interference

Keyun Gu, Zilong Zhang, Zhaozong Zhang, Jian Huang et autres

The precise characterization of bulk properties of thin homoepitaxial diamond layers with micrometer thickness is difficult due to the interference from the substrate. In this work, we utilized smart-cut method to fabricate single-crystal diamond (SCD) cantilevers or plates and transferred them to …

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Frequency stability improvement of single-crystal diamond cantilever utilizing higher-order-mode excitation

Wen Juan Zhao, Guo Chen, Zhaozong Zhang, Satoshi Koizumi et autres

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Surface desorption properties of hydrogen-terminated diamond detected by micromechanical resonator

Keyun Gu, Zilong Zhang, Jian Huang, Yasuo Koide et autres

Diamond, with its ultra-wide bandgap energy, has emerged as an extreme semiconductor due to its extraordinary electronic and thermal properties. The hydrogen-terminated diamond surface has attracted extensive attention due to its unique p-type surface conductivity. However, the fundamental nature of this p-type …

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Perspectives of Internists and Surgeons on Borderline Resectable Hepatocellular Carcinoma: The Kanagawa Internists-Surgical Hepatocellular Carcinoma Treatment Collaboration Meeting Questionnaire

Tsunamasa Watanabe, Nobuhiko Taniai, Itaru Endo, Hisashi Hidaka et autres

神奈川県内で，外科-高難度AB施設，内科-消化器病学会または肝臓学会専門医が常勤する45施設を対象に，肝細胞癌に対する肝切除の判断基準や集学的治療について，内科医と外科医にアンケート調査を行った．28施設69名（内科41，外科28）より回収し，①切除可能，borderline，切除不可の条件，②薬物治療先行後肝切除の判断，③薬物治療奏効後の次治療選択，等について検討した．切除条件に関しては，年齢・腫瘍個数等に内科と外科で若干の差を認めた．薬物先行後肝切除を考慮する判断項目は，down stage以外に内科医は完全奏効，外科医は一定期間再発なしを重視した．薬物治療奏効後では，内科医は薬物治療継続が多く，腫瘍縮小やVp4がVp2まで奏効した場合に肝切除を選択したが，外科医の切除選択率より低かった．集学的治療では，Cancer boardによる共通言語を用いた内科と外科の目線合わせが重要である．

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Characteristics and Application of High Strength Liquid Crystal Polymer Fiber VECTRANTM

Satoshi Koizumi

Single Crystal Diamond MEMS for Revealing the Desorption of Adsorbates on O-Terminated Diamond

Keyun Gu, Zilong Zhang, Guo Chen, Wen Juan Zhao et autres

Surface states of O-terminated diamond determine the electronic properties of devices. The in-situ realization of the surface properties in atomic scale relies on ultra-high vacuum and sophisticated techniques. Here, we propose the utilization of diamond microelectromechanical system (MEMS) to reveal the surface …

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P-Channel MOSFETs on Phosphorous-Doped n-Type Diamond

Wen Juan Zhao, Satoshi Koizumi, Meiyong Liao

P-channel metal-oxide-semiconductor field-effect transistors (MOSFETs) have been demonstrated on phosphorus-doped n-type diamond epilayers. The p-channel nature arises from the surface conductivity resulting from hydrogenated termination on the n-type diamond surface. The MOSFET exhibits normally-on properties and shows a threshold of 1.8 V …

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Neutron Non-destructive Inspection for Steel Welding & Resin Form Processing

Satoshi Koizumi, Shiho Tanaka, Yohei Noda, Tomoki Maeda et autres

In order to promote the industry use of neutrons from inside Ibaraki prefecture, we initiated a collaboration with the union of steel welding in Ibaraki. By using a combined method of neutrons, i.e., radiography (NR), diffraction (ND) and small-angle scattering (SANS), which …

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Low-Energy Dissipation Diamond MEMS

Guo Chen, Satoshi Koizumi, Yasuo Koide, Meiyong Liao

High Resolution Image Download MS PowerPoint Slide Conspectus Microelectromechanical systems (MEMS) that integrate tiny mechanical devices with electronics on a semiconductor substate have experienced explosive growth over the past decades. MEMS have a range of wide applications from accelerometers and gyroscopes in …

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Diamond NEMS Resonators for Real-Time Dual Sensing of Magnetic Fields and Temperatures up to 500°C

Zilong Zhang, Keyun Gu, Guo Chen, Yasuo Koide et autres

Real-time multifunctional sensing of magnetic fields and temperatures with preserved performances from room temperature to 500°C has posed a challenge for conventional sensing techniques. In this work, we demonstrate a smart multifunctional sensor based on single crystal diamond (SCD) MEMS resonators that …

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High-order resonance of single-crystal diamond MEMS with high-quality factor at high temperatures

Guo Chen, Zilong Zhang, Keyun Gu, Liwen Sang et autres

MEMS resonators are typically engineered to function at their first vibration mode, and extensive research has been dedicated to understanding and optimizing this fundamental mode. However, despite the demonstrated effectiveness of operating at high modes for achieving high sensitivity in MEMS sensing …

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