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Superconducting MgB2 Films as Radiation Detectors
Takekazu Ishida,Daisuke Fujiwara,Hisashi Shimakage,Kazuo Satoh,Masahiko Machida,Masaru Kato,Masatoshi Nishikawa,Shigehito Miki,Tsutomu Yotsuya,Zhen Wang 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.5I
The thermal response of a membrane-structured MgB2 film can be used to detect various sorts of radiations. High-quality MgB2 films were prepared by a sputtering technique. The MgB2 radiation detector consisted of an MgB2 thin-film meander line on a 0.5-μm-thick SiN membrane. The detector devices were placed in a 4 K refrigerator, and the operating temperature was controlled at a certain temperature below Tc. Light from a 20-ps pulsed laser directly irradiated the MgB2 device; the end of the optical fiber was fixed in front of the device. An erbium-doped fiber amplifier (EDFA) and a GP-IB attenuator were used to control the laser power, and the output voltage was observed through a low-noise amplifier by using a digital oscilloscope. The output signals caused by thermal response were clearly observed. Systematic studies of the output signals were conducted, and effects of device design, dc bias conditions, bias temperature, and input laser power were considered. We report the out-of-equilibrium thermodynamics, which was investigated by means of extensive computer simulations based on the time-dependent Ginzburg-Landau equations, thermodynamics, and electrodynamics. Large-scale calculations were carried out under the realistic conditions of actual devices by using an Earth Simulator (ES). One attractive application is to use the device as a novel neutron detector by employing the 10B(n,)7Li nuclear reaction with a local energy release of 2.3 MeV.
Takekazu Kato,Hyun Sang Cho,Dongwook Lee,Tetsuo Toyomura,Tatsuya Yamazaki 동국대학교 정보융합기술원 2009 International Journal of Assistive Robotics and Sy Vol.10 No.4
We are developing a novel home network system based upon the integration of information and energy. The system aims to analyze user behavior with a power-sensing network and provide various life-support services to manage power and electric appliances according to user behavior and preferences. This paper describes an electric appliance recognition method using power-sensing data measured by CECU (Communication and Energy Care Unit) which is an intelligent outlet with voltage and current sensors to integrate legacy appliances (which are incompatible with a communication network) within the home network. Furthermore, we demonstrate a prototype home energy management system and examples of services based upon appliance recognition.
ESR Study on Molecular Salt (Benzo-TTFVS)2MBr4 (M = Fe, Ga)
Shuichi Kawamata,Takekazu Ishida,Taro Hayakawa,Takashi Hiraoka,Hideki Fujiwara,Toyonari Sugimoto 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
Electron spin resonance (ESR) experiments on (Benzo-TTFVS)2MBr4 (M = Fe, Ga) have been done with 15.4 GHz microwaves, where Benzo-TTFVS denotes a new donor molecule substituted with a benzo group, benzotetrathiafulvalenothioquinone-1,3-dithiolemethide. The temperature and the magnetic-field-direction dependencies of the effective g-value and the linewidth are obtained. In (Benzo-TTFVS)2GaBr4 (Ga salt), the ESR signals are due to π-electrons while they originate from d-electrons at the Fe3+ ion in the case of (Benzo-TTFVS)2FeBr4 (Fe salt). The g-value and the linewidth for the direction of the π-d correlation are dierent from those for other directions in the Fe salt. A strong antiferromagnetic fluctuation related to the π-d correlation is observed in the Fe salt. On the other hand, in the Ga salt, the magnetic-eld-direction dependencies of the g-value and the linewidth re ect the anisotropy of the one-dimensional conduction band. The importance of the π-d correlation is proved by comparing the ESR results for the Fe salt with those for the Ga salt. Electron spin resonance (ESR) experiments on (Benzo-TTFVS)2MBr4 (M = Fe, Ga) have been done with 15.4 GHz microwaves, where Benzo-TTFVS denotes a new donor molecule substituted with a benzo group, benzotetrathiafulvalenothioquinone-1,3-dithiolemethide. The temperature and the magnetic-field-direction dependencies of the effective g-value and the linewidth are obtained. In (Benzo-TTFVS)2GaBr4 (Ga salt), the ESR signals are due to π-electrons while they originate from d-electrons at the Fe3+ ion in the case of (Benzo-TTFVS)2FeBr4 (Fe salt). The g-value and the linewidth for the direction of the π-d correlation are dierent from those for other directions in the Fe salt. A strong antiferromagnetic fluctuation related to the π-d correlation is observed in the Fe salt. On the other hand, in the Ga salt, the magnetic-eld-direction dependencies of the g-value and the linewidth re ect the anisotropy of the one-dimensional conduction band. The importance of the π-d correlation is proved by comparing the ESR results for the Fe salt with those for the Ga salt.
Naohiro Nishikawa,Katsuhiko Omoe,Kenji Murakami,Yusuke Sato,Takekazu Sawa,Yoshihiro Hagihara,Nobuhito Yoshihara,Hiroaki Okawai,Toshirou Iyama,Masahiro Mizuno,Shinya Tsukamoto 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
It is great concern that is environmental load in manufacturing. In machining site, metal working fluid (coolant) such as cutting oil,grinding fluid is used. It contains several chemicals that are oil, surface active agent, extreme pressure additive, antirust agent,antifoaming agent, preservative, biocide etc.. It is thought that it is not good for environment and human body. Machining fluid mist and splash contained several chemicals that are cause of danger for worker’s health while machining. Furthermore, time elapses, fluid is rotten by bacteria. Bad smell and degradation of machining performance occurs. Therefore, after using machining fluid, waste fluid is disposed. Incineration or coagulative precipitation and landfill etc. are necessary. It arise great disposal cost and environmental load as discharging of huge amount green house gas (CO2 etc.). Then, machining fluid decreasing or non-using is demanded in industry. So, in this investigation, new environmental machining method: the electric rust preventive machining method system that uses only water as machining fluid has been developed. In this paper, water purification recycle system in water machining system development is mentioned. Therefore, complete removal of bacteria (Enterobacter aerogenes) without using chemicals such as biocide is examined for corruption, malodor prevention and safe machining water.
A d-dot As an Element of Superconducting Devices
Masaru Kato,Hisataka Suematsu,Masahiko Machida,Masaki Hirayama,Takekazu Ishida,Tomio Koyama 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.5I
A d-dot is the composite structure of a d-wave superconductor and an s-wave superconductor. Spontaneous half-quantum magnetic °uxes appear around the corners of the d-wave supercon- ducting region. Because of the broken time-reversal symmetry of this state, there are always two degenerate states. We show some basic properties of the d-dot and discuss the potential ability of using the d-dot as a two-state device.
Masahiko Hayashi,Toru Kaiwa,Yoshiaki Matsushima,Makoto Shimizu,Takekazu Ishida,Kazuo Satoh,Tsutomu Yotsuya,Hiromichi Ebisawa 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1
It is shown that the spatial resolution of scanning superconducting quantum interference device (SQUID) microscope, which is considered naively to be limited by the size of the pickup coil (typically grater than of the order of ㎛), can be improved by applying a mathematical transformation to the obtained data. The resolution of the image is improved at best to the scanning step size (can be less than of the order of ㎛) even in the presense of the noise. Problems to be solved in applying the method to visualize the uxons in superconducting network structures are discussed by use of numerical simulations and of real experimental data.