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81.
Aya Uruno Yohei Sakurakawa Masakazu Kobayashi 《Journal of Electronic Materials》2018,47(10):5730-5734
AgGaTe2, AgAlTe2, CuGaTe2, and Ag(Ga,Al)Te2 layers were deposited by the close spaced sublimation method. The surface morphology and crystal quality of these Te-based chalcopyrite layers were systematically evaluated. Controlling the stoichiometry of these layers grown by the closed space sublimation was very difficult because Te preferentially detached from the source materials during the sublimation process and then Te vapor leaked out from the reactor. To solve this problem, the gap between the lid and reactor boat was minimized, and the vapor was encapsulated. As a result, the crystal quality of the AgGaTe2 and AgAlTe2 was improved. However, the controlling stoichiometry of CuGaTe2 remained difficult even after the Te vapor leakage was minimized. This behavior was attributed to the large vapor pressure difference between Cu and Te. The surface morphology of the grown AgGaTe2 and CuGaTe2 layers exhibited scattered grain structure, while that of AgAlTe2 possessed a continuous film structure. These different surface structures contributed to differing wettability between the chalcopyrite materials and substrates. It was found that AgAlTe2 exhibited a high wettability against a sapphire substrate, which promoted continuous film formation. 相似文献
82.
Tongkai Huang TetsurŌ Nakamura Mitsuru Itoh Yoshiyuki Inaguma Osamu Ishiyama 《Journal of Materials Science》1995,30(6):1556-1560
Polycrystalline materials of BaSn1–x
Sb
x
O3– and Ba1–y
La
y
SnO3– were prepared. Substitutional solubilities of antimony for tin and lanthanum for barium, respectively, in BaSnO3 were obtained to be x=0.18 for BaSn1–x
Sb
x
O3– and y<0.052 for Ba1-y
La
y
SnO3–. The X-ray photoemission spectroscopy measurements showed the valence of antimony and tin is mixed in our samples of BaSn1–x
Sb
x
O3–. At lower temperature, magnetic susceptibilities of BaSn1–x
Sb
x
O3– and Ba1–y
La
y
SnO3– satisfy the Curie law, indicating the existence of non-interacting localized electrons at the Sn4+ site, and forming a Sn4++e– state in these systems. By substitution of antimony and lanthanum in BaSnO3, the conductive properties are semiconductor-like. To explain this conductive behaviour, three types of mechanism were taken into consideration. 相似文献
83.
Nagata S Tsuneta S Sakao T Yoshida T Hara H Kano R Ishiyama W Murakami K Ohtan M 《Applied optics》1997,36(13):2830-2838
Multilayer mirrors with a system wavelength resolution (lambda/Dlambda) as high as 30-50 are required for the diagnostics of cosmic plasmas with temperatures of 1-20 MK. Such a high wavelength resolution can be realized by increasing the number of layer pairs contributing to the reflectance, by selecting less-absorbing materials for both the reflector and the spacer, and by decreasing the thickness of the reflector. We have fabricated a multilayer mirror tuned to 284 A with a silicon carbide reflector (20% thickness of the layer period) and an aluminum spacer and achieved lambda/Dlambda ~26.8 with a peak reflectivity of ~13.0%. This wavelength resolution is close to the value obtained with a numerical simulation and is considerably higher than the value obtained with the conventional Mo/Si multilayer. 相似文献
84.
A novel low‐power gate driver architecture for large 8 K 120 Hz liquid crystal display employing IGZO technology
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Yasuaki Iwase Akira Tagawa Yohei Takeuchi Takuya Watanabe Satoshi Horiuchi Yoshihiro Asai Kaoru Yamamoto Tohru Daitoh Takuya Matsuo 《Journal of the Society for Information Display》2018,26(5):304-313
A novel low‐power gate driver architecture was developed for large 8 K 120 Hz liquid crystal display panel. For this application, not only high‐speed driving but also low power consumption is required. We employed a high mobility In‐Ga‐Zn‐O, dual VGL level driving method, and gate driver circuit driven by DC supply. The simulation results show that our proposals meet 8 K 120 Hz driving requirements. Also, we have fabricated a prototype panel and confirmed both high‐speed driving and low power consumption. 相似文献
85.
Yoshio Ichida Hiroaki Ohfuji Tetsuo Irifune Takehiro kunimoto Yohei Kojima Toru Shinmei 《Journal of the European Ceramic Society》2018,38(7):2815-2822
Using a turbostratic pyrolytic boron nitride as a starting material, we synthesized a variety of ultrahard polycrystalline cubic boron nitride (PcBN) as a function of the heating duration changing from 1 to 60?min under a constant temperature and pressure conditions (1950?°C and 25?GPa) using a multi-anvil apparatus. When the heating duration was less than 13?min, ultrafine nano-polycrystalline cBN (U-NPcBN) with the mean grain size of <50?nm was produced. Among these U-NPcBNs those synthesized with 11–13?min were found to have a uniform texture composed purely of cBN (i.e. with no wurzite BN residue) and a Knoop hardness of >53?GPa, which is 20% higher than that of the hardest conventional binderless PcBN in practical use. Furthermore, the PcBNs synthesized with 18–20?min showed a unique nanocrystalline texture composed of relatively coarse grains dispersed in a fine grained matrix and even higher Knoop hardness (54.5–55.2?GPa). 相似文献
86.
Shigeru Motoi Toshie Misu Yohei Nakada Tomohiro Yazaki Go Kobayashi Takashi Matsumoto Nobuyuki Yagi 《Pattern Analysis & Applications》2012,15(1):59-72
Event detection can be defined as the problem of detecting when a target event has occurred, from a given data sequence. Such
an event detection problem can be found in many fields in science and engineering, such as signal processing, pattern recognition,
and image processing. In recent years, many data sequences used in these fields, especially in video data analysis, tend to
be high dimensional. In this paper, we propose a novel event detection method for high-dimensional data sequences in soccer
video analysis. The proposed method assumes a Bayesian hidden Markov model with hyperparameter learning in addition to the
parameter leaning. This is in an attempt to reduce undesired influences from ineffective components within the high-dimensional
data. Implemention is performed by Markov Chain Monte Carlo. The proposed method was tested against an event detection problem
with sequences of 40-dimensional feature values extracted from real professional soccer games. The algorithm appears functional. 相似文献
87.
88.
This paper aims to provide information on process improvement for energy-efficient manufacturing. A machine tool has the highest rate of energy consumption among plant equipment. There are effective ways to reduce energy consumption of machine tools such as reducing required energy, shutting down the power to standby equipment, and shortening the cycle time. This paper introduces several approaches for process improvement such as optimizing the cutting conditions and the inclination angle of the tool in 5-axis machining. Minimizing the use of fluid and using control functions are also shown to be effective. 相似文献
89.
90.
Yohei Abe Toru Kato Ken-ichiro Mori Shoma Nishino 《Journal of Materials Processing Technology》2014,214(10):2112-2118
Ultra-high strength steel sheets having low ductility were joined by mechanical clinching with dies for control of metal flow. The diameter and depth of the die were modified to relieve concentration of deformation of the sheets for avoidance of the occurrence of sheet fracture. As the tensile strength of the steel sheets increased, the interlock decreased due to small metal flow. Two kinds of the ultra-high strength steel sheets having different ductility were used. The ultra-high strength steel sheets having large ductility were successfully joined using die having modified shape, whereas the sheets having small ductility were not joined. The static and fatigue strengths of the mechanically clinched joint were compared with those of the resistance spot welded joint. Although the static load of the mechanically clinched joint was smaller than that of the resistance spot welded joint in both tension-shearing and cross-tension tests, the fatigue load of the clinched joint was larger in the large number of cycles. It was found that mechanical clinching has superior fatigue strength due to the large yield stress of the sheets and relaxation of the stress concentration. 相似文献