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81.
Wakamatsu M. Kato K. Inoue N. Koide H. Okubo H. 《Dielectrics and Electrical Insulation, IEEE Transactions on》2003,10(6):942-947
An insulating oil/pressboard (PB) composite insulation is generally utilized in oil-immersed power transformers. In such a transformer, charges accumulate at oil/PB interface which changes the electric field distribution depending on time and oil condition. In this paper, we report on directly measured dc electric field in oil/PB composite insulation system using the Kerr electro-optic field measurement technique. From measurement results, we propose a physical model for the charge behavior. We have calculated an electric field distribution using finite element method (FEM) based on the charge movement. We compared the results of measurements and calculations and confirmed that the proposed charge behavior model explains well the experimental results in the case of the polarity reversals as well. As a result, a significant validity of the charge behavior model was confirmed. 相似文献
82.
Mika Yoshimura Fujii Katsuhiko Gato Yosuke Ozawa Hiroshi Hisada Tatsuo Koide Motoki Inoue Toshiro Fukami 《European Journal of Lipid Science and Technology》2020,122(3)
In this study, lipid structural change is monitored using Raman spectroscopy during heat treatment, along with the impact of lipid states on the structural and physical properties during the preparation process of the dried and hydrated lipid mixture (LM) similar to intercellular lipid in stratum corneum. The microstructures and thermal behavior of these LMs change depending on the melting of lipid ingredients in the preparation process. It is recognized that variable temperature Raman spectroscopy (VT‐Raman) is a useful and attractive tool for the sensitive in situ monitoring of lipid state changes and lipid melting. The LMs can incorporate D2O into their structures regardless of preparation temperature due to increasing lattice distance by hydration. These results suggest that monitoring lipid structural changes during the heating step is important to precisely prepare target LMs. Practical Applications: This study reveals that VT‐Raman is a useful and attractive tool in in situ monitoring of lipid state change and lipid melting. The monitoring of the preparation process by VT‐Raman is necessary to precisely prepare the target LM similar to intercellular lipid of stratum corneum because the microstructures and thermal properties of these LMs change depending on the melting of lipid ingredients during the preparation process. 相似文献
83.
T. Kagawa Yasuo Koide T. Oku H. Mori N. Teraguchi Y. Tomomura A. Suzuki Masanori Murakami 《Journal of Electronic Materials》1998,27(8):998-1002
The effects of formation of intermediate semiconductor layers at p-ZnSe/metals interfaces on carrier transport mechanisms
were studied by comparing contacts prepared by the deposition and annealing (DA) technique or the molecular beam epitaxy (MBE)
technique. Current density vs voltage (J-V) curves of the MBE contact with a p-ZnSe/p-ZnTe superlattice intermediate layer
showed ohmic behavior. However, J-V curves of the DA contact with a ZnTe intermediate layer showed rectifying behavior. The
difference of the electrical properties between these two contacts was due to existence of a highly resistive intermediate
layer with highly dense defects in the DA contact and a low resistance p-type conductive intermediate layer with relatively
small densities of crystalline defects in the MBE contacts. From the present results, it was concluded that formation of the
highly resistive semiconductor layer with dense crystalline defects prevented the DA contact to transit from non-ohmic J-V
behavior to ohmic. 相似文献
84.
Abstract The long-term safety assessment of CO_2 aquifer storage requires a deep understanding of permeability evolutionduring inelastic deformations in sedimentary rocks. The permeability change has been measured in the entire process fromelastic, plastic, post-failure to axial stress unloading for Shirahama sandstone subjected to triaxial compressions undervarious confining pressures. The measurements revealed that the confining pressure plays an important role in controllinginelastic deformation behavior and the tendency of the permeability evolution. In the brittle faulting regime under a lowconfining pressure, significant increase in permeability accompanied by dilatancy can be observed. In brittle-ductile transition 相似文献
85.
A parallel redundancy has been researched in a great amount of literature on reliability theory. In the real circumstances, however, it is seldom observed except some systems that require much higher reliability. This is because most of the literature only look at the manufacturer’s point of view. The present study carries out an economic analysis of an n-unit parallel redundant system against a single unit system based on a Stackelberg game formulation considering both the consumer’s viewpoint and the manufacturer’s one. It clarifies quantitatively in what situation the manufacturer can increase his profit by dealing in the parallel redundant system. 相似文献
86.
Hanaoka R. Nakamichi H. Takata S. Koide H. Hatta Y. 《Dielectrics and Electrical Insulation, IEEE Transactions on》2006,13(3):526-531
The basic properties of electrohydrodynamic (EHD) pumping and dielectric strength were examined for two insulating oils, rapeseed ester oil and silicone oil, which were denatured by a bonding of hydrofluorocarbon (HFC)134a gas components decomposed using a barrier discharge reactor. In this work, the mechanism of a pure conduction pumping contributed to the evaluation of the electrical pumping in sample oils. Dielectric strength of oils was evaluated from the impulse creeping discharge characteristics and the 60 Hz breakdown voltage test. Experimental results revealed that the creation of radicals such as C-F and C-H in denatured oils led to a slight deterioration of the insulation ability compared to standard oils, but the pumping ability was reinforced significantly. Such additional EHD function may be utilized as a new cooling method in oil-filled power apparatuses in view of the dielectric strength. 相似文献
87.
The two extreme functionally equivalent possibilities of distributed or centralised crossbar function for realising a bank-based multiport memory are compared on the basis of required global signal and transistor numbers. With respect to both measures, the distributed crossbar function is found to be the better choice for practically relevant multiport-memory configurations. 相似文献
88.
Ju DY Bian P Kumazawa T Nakano M Matsuura H Umetani K Komdo T Uozumi Y Makino K Noda N Koide K Akutsu M Masuyama K 《Journal of nanoscience and nanotechnology》2011,11(10):8738-8743
In this study, the composite magnetic nanoparticles of coated SiO nano film with about 8 nm size and high saturation magnetization value, were synthesized by liquid phase precipitation method. The magnetic nanoparticles can be dispersed in various liquid media, widely known as magnetic fluids or ferrofluids with both magnetic and liquid properties. The materials been collected great interests and more and more attentions to focus into Drug Delivery System (DDS) as a new technology in this paper. We use the composite nanoparticles to disperse H2O and inject the solutions into rat's in-vivo organs. And, in the experiments by using a strong photon beam of SPring-8 Synchrotron Radiation facility, the distribution stat and the effects of magnetic field as well as drug delivery behaviour of nanoparticles in the rat' kidney are verified by the in-vivo observations. 相似文献
89.
Flexible Ultraviolet Photodetectors with Broad Photoresponse Based on Branched ZnS‐ZnO Heterostructure Nanofilms 下载免费PDF全文
90.
Effects of annealing in an oxygen ambient on electrical properties of ohmic contacts to p-type GaN 总被引:3,自引:0,他引:3
Yasuo Koide T. Maeda T. Kawakami S. Fujita T. Uemura N. Shibata Masanori Murakami 《Journal of Electronic Materials》1999,28(3):341-346
Effects of annealing ambient of an oxygen and nitrogen mixed gas on the electrical properties were studied for Au-based ohmic
contacts (NiAu, CoAu, CuAu, PdAu, and PtAu) to p-type GaN. Addition of oxygen to the nitrogen gas reduced the specific contact
resistances (ρc) and resitivities of the p-GaN epilayers (ρs) of the contacts after annealing at temperatures of 500–600°C. The microstructural analysis at the p-GaN/metal interfaces
did not detect the heterostructural intermediate semiconductor layer at the GaN/metal interfaces. The reason for reduction
of both the ρc and ρs values by the oxygen gas addition was believed to be due to formation of the p-GaN epilayer with high hole concentrations,
caused by removal of hydrogen atoms which bonded with Mg atoms. 相似文献