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Investigation of Pyrolyzed Polyimide Thin Film as MEMS Material
Naka, Keisuke,Nagae, Hideki,Ichiyanagi, Masao,Jeong, Ok-Chan,Konishi, Satoshi The Institute of Electronics and Information Engin 2005 Journal of semiconductor technology and science Vol.5 No.1
Pyrolyzed polyimide is explored in terms of MEMS material. This paper describes chemical, electrical, mechanical properties of pyrolyzed polyimide (PIX-1400) thin film as MEMS material. When polyimide thin film was pyrolyzed at $800^{\circ}C$ for 60 minutes in $N_{2}$ ambient, the residual ratio of pyrolyzed film thickness measured with a surface profiler is about 49 %, and the resistivity is about $2.17{\times}10^{-2}\;{Omega}cm$. From the result of the load-deflection test, the estimated Young's modulus and initial average stress of pyrolyzed polyimide are 67 GPa and 30 MPa, respectively. As one demonstration of MEMS structures of pyrolyzed polyimide, the fabrication method of the microbridge structure is proposed for a micro heater and a resonator.
Effect of Temperature and Forming Speed on Deep Drawability of 5083 Aluminium Alloy Sheet
Naka, T .,Yoshida, F . 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.3
Cylindrical deep drawing tests were performed on a fine-grain aluminium-magnesium alloy (5083-0) sheet at various forming speed (0.2∼500 ㎜·min^(-1)) and temperatures (298, 353, 423 and 453 K). It was found that limiting drawing ratio (LDR) is strongly affected by temperature while its value increases with decreasing forming speed independent of the test temperature. The LDR reaches minimum value at 353 K. It is associated with the maximum flow stress registered for this particular temperature and caused in turn by dynamic strain ageing.
Naka, Kazuhito,Ishihara, Kaori,Jomen, Yoshie,Jin, Cheng Hua,Kim, Dong‐,Hyun,Gu, Yoon‐,Kang,Jeong, Eun‐,Sook,Li, Shaoguang,Krause, Daniela S.,Kim, Dong‐,Wook,Bae, Eunjin,Takihar John Wiley and Sons Inc. 2016 CANCER SCIENCE Vol.107 No.2
<P>Recent strategies for treating CML patients have focused on investigating new combinations of tyrosine kinase inhibitors (TKIs) as well as identifying novel translational research agents that can eradicate CML leukemia‐initiating cells (CML‐LICs). However, little is known about the therapeutic benefits such CML‐LIC targeting therapies might bring to CML patients. In this study, we investigated the therapeutic potential of EW‐7197, an orally bioavailable transforming growth factor‐β signaling inhibitor which has recently been approved as an Investigational New Drug (NIH, USA), to suppress CML‐LICs <I>in vivo</I>. Compared to TKI treatment alone, administration of TKI plus EW‐7197 to CML‐affected mice significantly delayed disease relapse and prolonged survival. Notably, combined treatment with EW‐7197 plus TKI was effective in eliminating CML‐LICs even if they expressed the TKI‐resistant T315I mutant <I>BCR‐ABL1</I> oncogene. Collectively, these results indicate that EW‐7197 may be a promising candidate for a new therapeutic that can greatly benefit CML patients by working in combination with TKIs to eradicate CML‐LICs.</P>
Efficiency of a Micro Pump driven by Conducting Polymer Soft Actuator with Open/Close movement
Yoshitaka Naka,Masaki Fuchiwaki,Kazuhiro Tanaka 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In recent years, the research of micro pumps are actively conducted with the rise of MEMS (Micro ElectroMechanical Systems) technology. In this study the authors have realized the micro pump driven by conducting polymer soft actuator that perform open/close movement based on polypyrrole and measured their performance. It could adjustflow rates in the approximately 2 - 83 [??l/min] and easily change the pressure. The micro pump could transport fluideven with the viscosity that is 400 times as large as that of water. Moreover, the micro pump could transport fluid withan energy consumption rate less than half those of the conventional micro pumps.
Sadahiro Naka,Toshimitsu Watanabe,Yasukazu Kanai,Tadashi Watabe,Tatsumi Mitsuaki,Kato Hiroki,Shimosegawa Eku,Jun Hatazawa 대한핵의학회 2022 핵의학 분자영상 Vol.56 No.2
Purpose 4-Borono-2-[18F]fluoro-L-phenylalanine ([18F]FBPA) synthesized with [18F]F2, produced using the 18O(p, n)18F reaction, has been reported for increasing radioactivity. However, a dedicated system and complex procedure is required to reuse the costly [18O]O2 gas; also, the use of [18F]F2 as a labeling agent reduces the labeling rate and radiochemical purity.We developed a stable and practical method for [18F]FBPA synthesis by combining [18F]F2, produced using a [18O]O2 single-use system, and a [18F]CH3COOF labeling agent. Methods The produced [18F]F2 was optimized, and then [18F]FBPA was synthesized. For passivation of the target box, 0.5% F2 was pre-irradiated in argon.Gaseous products were discarded; the target box was filledwith [18O]O2 gas, and then irradiated (first irradiation). Then, the [18O]O2 gas was discarded, 0.05–0.08% F2 in argon was fed into the target box, and it was again irradiated (second irradiation). The [18F]F2 obtained after this was passed through a CH3COONa column, converting it into the [18F]CH3COOF labeling agent, which was then used for [18F]FBPA synthesis. Results The mean amount of as-obtained [18F]F2 was 55.0 ± 3.3 GBq and that of as-obtained [18F]CH3COOF was 21.6 ± 1.4 GBq after the bombardment. The radioactivity and the radiochemical yield based on [18F]F2 of [18F]FBPA were 4.72 ± 0.34 GBq and 12.2 ± 0.1%, respectively. The radiochemical purity and molar activity were 99.3 ± 0.1% and 231 ± 22 GBq/mmol, respectively. Conclusion We developed a method for [18F]FBPA production, which is more stable and practical compared with the method using [18O]O2 gas-recycling and [18F]F2 labeling agent.