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81.
Daiki Satoh Kensuke Kojima Akito Oizumi Norihiro Matsuda Hiroki Iwamoto Teruhiko Kugo 《Journal of Nuclear Science and Technology》2013,50(5):656-670
A calculation system for the estimation of decontamination effects (CDE) is developed in the present work to aid in the effective planning of decontamination procedures. This system calculates dose rate distribution before and after decontamination according to the distribution of radioactivity and the decontamination factor. A dose rate reduction factor is also used to estimate decontamination effects. Results obtained from CDE were compared with measurements and particle and heavy-ion transport code system (PHITS) simulations. The CDE successfully reproduced the measured and calculated dose rate distributions, requiring less than several seconds of calculation time. 相似文献
82.
Takahiro Yano Yuji Higaki Di Tao Daiki Murakami Motoyasu Kobayashi Noboru Ohta Jun-ichiro Koike Misao Horigome Hiroyasu Masunaga Hiroki Ogawa Yuka Ikemoto Taro Moriwaki Atsushi Takahara 《Polymer》2012,53(21):4702-4708
The development of macroscopic nanofiber orientation and microscopic crystallite and molecular chain orientation have been investigated during uniaxial stretching of electrospun poly(vinyl alcohol) (PVA) non-woven nanofiber mats. Scanning electron microscopy and stress-strain/small-angle X-ray scattering show that the macroscopic nanofiber orientation significantly increases during the initial stage of deformation, and approaches a plateau on the way of stretching. Detailed analyses of the stress-strain/wide-angle X-ray diffraction measurement and polarized Fourier transform infrared spectroscopy indicate that the microscopic crystallite and molecular chain orientation rapidly increase at the initial stage of stretching due to macroscopic nanofiber orientation. At higher deformation, the microscopic modes of orientation continuously develop as a result of the nanofiber stretching. The complicated deformation process of non-woven nanofiber mats is discussed in terms of macroscopic nanofiber orientation and the microscopic crystallite and molecular chain orientation. 相似文献
83.
Takashi Komine Masahiro Kuraishi Takayuki Teramoto Ryuji Sugita Yasuhiro Hasegawa Masayuki Murata Daiki Nakamura 《Journal of Electronic Materials》2010,39(9):1606-1610
We have used the finite-element method to calculate numerically the equations of electrical and thermal transport. The thermal
conductivity of a wire array is analyzed. The influence of the wire array on the effective thermal conductivity of the element
is discussed. The effective thermal conductivity decreases as the wire diameter is reduced. Decreasing the packing density
significantly reduces the effective thermal conductivity. In the classical regime, the ratio of the effective electrical conductivity
to the effective thermal conductivity of the wire array can be expressed as a function of packing density; this ratio decreases
as the packing density decreases. The ratio for a wire array with realistic parameters is similar to that of bulk bismuth.
Therefore, to improve the thermoelectric figure of merit, it is critical to enhance the intrinsic power factor in a wire by
exploiting thermomagnetic or quantum effects. 相似文献
84.
Masayuki Murata Daiki Nakamura Yasuhiro Hasegawa Takashi Komine Daisuke Uematsu Shinichiro Nakamura Takashi Taguchi 《Journal of Electronic Materials》2010,39(9):1536-1542
Three methods for attaching electrodes to a bismuth nanowire sample were investigated. In the first and second methods, thin
layers of titanium and copper were deposited by ion plating under vacuum onto the edge surface of individual bismuth nanowire
samples that were encapsulated in a quartz template. Good electrical contact between the electrodes and the nanowire was achieved
using silver epoxy and conventional solder on the thin-film layers in the first and second methods, respectively. In the third
method, a low-melting-point solder was utilized and was also successful in achieving good electrical contact in air atmosphere.
The connection methods showed no difference in terms of resistivity temperature dependence or Seebeck coefficient. The third
method has an advantage in that nanocontact is easily achieved; however, diffusion of the solder into the nanowire allows
contamination near the melting point of the solder. In the first and second methods, the thin-film layer enabled electrical
contact to be more safely achieved than the direct contact used in the third method, because the thin-film layer prevented
diffusion of binder components. 相似文献
85.
Go Okada Kenji Shinozaki Daiki Shiratori Noriaki Kawaguchi Takayuki Yanagida 《Ceramics International》2019,45(7):9376-9380
Radio-photoluminescence (RPL), which is an infrequent phenomenon observed in phosphor materials where new luminescent centre is generated by interacting with ionizing radiation, was observed in Eu-doped BaAlBO3F2 (BABF) glass-ceramics. The as-prepared material shows photoluminescence (PL) only due to the 4f‐4f transitions of Eu3+ whereas an additional broad emission band appears around 510?nm, which is due to the 5d‐4f transitions of Eu2+. The appearance of the Eu2+ as a new emission centre is an evidence of RPL. The RPL in this system is based on intra-valence reduction of Eu ion (Eu3+→Eu2+), which was confirmed as a decrease of PL intensity by Eu3+ and increase of PL intensity by Eu2+ as a function of irradiation dose. Moreover, additional RPL centre is observed after heat-treatment of irradiated material, which is seen as a broad PL peak centering around 480?nm. Based on the luminescence features, the latter RPL is characterized to defect-related luminescence. 相似文献
86.
Satoshi Uemori Masamichi Ishii Haruo Kobayashi Daiki Hirabayashi Yuta Arakawa Yuta Doi Osamu Kobayashi Tatsuji Matsuura Kiichi Niitsu Yuji Yano Tatsuhiro Gake Takahiro J. Yamaguchi Nobukazu Takai 《Journal of Electronic Testing》2013,29(6):879-892
This paper describes the architecture and principles of operation of sigma-delta ( ΣΔ) time-to-digital converters (TDC) for high-speed I/O interface circuit test applications. In particular, we describe multi-bit ΣΔ TDC architectures; they offer good accuracy with short testing time. However, mismatches among delay cells in delay lines degrade their linearity. Here we propose two methods to improve the overall TDC linearity: a data-weighted-average (DWA) algorithm, and a self-calibration method that measures delay values using a ring oscillator circuit. Our Matlab simulation results demonstrate the effectiveness of these approaches. 相似文献
87.
Behaviormetrika - Heaping, where responses are concentrated in round numbers, such as 5 or 10, is one of the response behaviors observed in surveys. The heaping phenomenon in subjective quantities... 相似文献
88.
Daiki Takahashi Sho Sakaino Toshiaki Tsuji Yasuyoshi Kaneko 《Electrical Engineering in Japan》2016,194(1):27-36
Working in extreme environments (e.g., at disaster sites) is dangerous for humans. Hence, it is important to use teleoperated robots in such extreme environments. Because heavy lifting work is involved, hydraulic actuators with high output are more commonly used than electric actuators. Therefore, it is necessary to operate remotely controlled robots driven by hydraulic actuators. Bilateral control is remote control with a sense of force. Because most bilateral control systems have been studied mainly using electric actuators, bilateral control using hydraulic actuators is still a challenge. In this study, we propose placing a bilateral controller between an electric actuator on the master side and a hydraulic actuator on the slave side using position and velocity. The controller exhibits the dynamics of bilateral control systems using position and velocity. In addition, the control performance of conventional methods and that of the proposed method are compared and experimentally verified. 相似文献
89.
A foldable OLED display with an in‐cell touch sensor having embedded metal‐mesh electrodes 下载免费PDF全文
Kazunori Watanabe Yuji Iwaki Yutaka Uchida Daiki Nakamura Hisao Ikeda Masahiro Katayama Takayuki Cho Hiroyuki Miyake Yoshiharu Hirakata Shunpei Yamazaki 《Journal of the Society for Information Display》2016,24(1):12-20
A foldable organic light‐emitting diode display integrating a touch sensor is fabricated. The touch sensor has an in‐cell structure where metal‐mesh sensor electrodes are formed in a counter substrate. It is demonstrated that touch on the entire panel surface, including a bent portion, is detected and that the touch panel operates correctly after 100,000 folding operations with a radius of curvature of 5 mm. 相似文献
90.
Daiki Wakizaka 《Polymer》2004,45(25):8561-8565
Multilayered ultrathin films of a conductive polymer, poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (PEDOT/PSS) were prepared by layer-by-layer deposition technique. These films were characterized by absorption spectroscopy, atomic force microscopy, cyclic voltammetry and potential step chronoamperometry. The PEDOT/PSS films were layered up with a bilayer thickness of 5 nm and the surface roughness of the films was improved after the ultrasonicated pretreatment of a PEDOT/PSS aqueous dispersion prior to the deposition. The ultrathin films thus obtained kept excellent diffusion constant of hole carriers, 5×10−10 cm2 s−1, as high as that of spin-cast films of PEDOT/PSS, indicating that the conducting polymer films are fabricated with nanometer-scale precision and act as a junction layer between the electrode and electrochemically active organic materials. 相似文献