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Article
Effects of Electrical Stress and High-Energy Electron Irradiation on the InGaP/GaAs Heterojunction Phototransistor
In this paper, we discuss the characteristics of the InGaP/GaAs heterojunction phototransistors (HPTs) before and after the electrical stress at room temperature and assess the effectiveness of the emitter-led...
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Article
Comparison of radioactive cesium contamination of lake water, bottom sediment, plankton, and freshwater fish among lakes of Fukushima Prefecture, Japan after the Fukushima fallout
Levels of radiocesium (134Cs + 137Cs) contamination in lake water, bottom sediment, plankton, and fish were investigated in three geographically separated lakes in Fukushima Prefecture (Lake Hayama, Lake Akimoto,...
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Chapter
Comparison of the Radioactive Cesium Contamination Level of Fish and their Habitat Among Three Lakes in Fukushima Prefecture, Japan, After the Fukushima Fallout
Levels of radiocesium (134Cs + 137Cs) contamination in lake water, bottom sediment, plankton, and fish were investigated in three geographically separated lakes in Fukushima Prefecture (Lake Hayama, Lake Akimoto,...
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Chapter
Assessment of Radiocesium Accumulation by Hatchery-Reared Salmonids After the Fukushima Nuclear Accident
To understand the process of radiocesium uptake in salmonids after the Fukushima Dai-ichi Nuclear Power Plant (FNPP) accident, a lake caging experiment and two captive-rearing experiments with controlled radio...
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Chapter
Radiocesium Concentrations and Body Size of Freshwater Fish in Lake Hayama 1 Year After the Fukushima Dai-Ichi Nuclear Power Plant Accident
We measured radiocesium (134Cs + 137Cs) concentrations in five freshwater fish species in Lake Hayama, Fukushima Prefecture, 1 year after the Fukushima Dai-ichi Nuclear Power Plant (FNPP) accident in March 2011. ...
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Article
Demographic survey of the yellow-phase Japanese eel Anguilla japonica in Japan
Catch statistics and biological data of the Japanese eel Anguilla japonica from 12 river systems in nine prefectures of Japan (36°N, 140°E–31°N, 130°E) during 1999–2004 were analyzed in order to evaluate the demo...
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Article
Effect of O2/Ni ratio on structure and surface morphology of atmospheric pressure MOCVD grown NiO thin films
Effect of oxygen to nickel molar ratio (O2/Ni) on the crystallinity of atmospheric pressure metal organic chemical vapor deposition (APMOCVD) grown NiO at 500°C is reported. X-ray diffraction (XRD) analysis inclu...
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Article
Intense Ultraviolet Photoluminescence Observed at Room Temperature from NiO Nano-porous Thin Films Grown by the Hydrothermal Technique
We have successfully formed high-quality nanoporous NiO films by the hydrothermal technique and observed intense ultraviolet (UV) luminescence at room temperature. The SEM image reveals nanoporous NiO films wi...
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Article
Fabrication of a p-NiO/n-Si Heterojunction Diode by UV Oxidation of Ni Deposited on n-Si
The metallic nickel (Ni) deposited on an n-Si substrate with resistivity of 4 – 6 Ω.cm was oxidized by the ultra-violet (UV) oxidation technique to form a p-NiO/n-Si heterojunction diode. The rectifying curren...
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Article
Capacitance-Voltage (C-V) Hysteresis in the Metal-Oxide-Semiconductor Capacitor with Si Nanocrystals Deposited by the Gas Evaporation Technique
Capacitance-Voltage (C-V) hysteresis was observed in the Metal-Oxide-Semiconductor (MOS) capacitor with silicon nanocrystals. The MOS capacitor was fabricated by thermal oxidation of Si nanocrystals, which wer...
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Article
Growth and Optical Properties of SnO2 Ultra-Small Nanorods by the Novel Micelle Techniques
Tin-dioxide (SnO2) ultra-small nanorods (UNR) have been successfully synthesized using the novel micellar technique. From transmission electron microscopy, the average diameter and length of the UNRs are estimate...
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Article
Comparative Study on Reliability of InP/InGaAs Heterojunction Bipolar Transistors with Highly Zn- and C-Doped Base Layers
The reliability of InP/InGaAs heterojunction bipolar transistors (HBTs) with highly carbon-doped and zinc-doped InGaAs base layers grown by metal-organic vapor phase epitaxy has been investigated. The Raman sp...
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Article
Multiple spawning of amphidromous type ayu Plecoglossus altivelis in a large river, Mogami River System
Female ayu Plecoglossus altivelis were sampled from the Mogami River System, Yamagata Prefecture to investigate the occurrence of multiple spawning that has previously been reported in small rivers. Spawning freq...
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Article
Multiple spawning and related variations in female reproductive parameters of amphidromous type ayu
Adult ayu Plecoglossus altivelis were sampled from the Nezugaseki River, Yamagata Prefecture to investigate the reproductive parameters and analyze their variations related to multiple spawning. Ovarian histology...
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Article
Evidence of multiple spawning in wild amphidromous type ayu
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Article
Experimental analysis of the territorial establishment of ayu, Plecoglossus altivelis
Ayu mainly grazes benthic algae on river beds. To clarify the effects of individual behavioral differences on the territory establishment of ayu, we first recorded the number of active movements, aggression to...
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Article
Cyclosporine A inhibits interleukin-8 production in a human colon epithelial cell line (HT-29)
Intestinal epithelial cells produce various inflammatory mediators. However, the way in which immunosuppressive agents influence the production of these mediators by intestinal epithelial cells is not understo...
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Article
III–V nitride growth by atmospheric-pressure MOVPE with a three-layered flow channel
We introduce III-V nitrides growth including GaN as well as InGaN by a newly developed atmospheric-pressure metal-organic vapor phase epitaxy system with a three layered flow channel which is a promising syste...
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Article
The formation of radiative defects at GaAs/GaInP interface
We report the optical characteristics of 100 Å thick GaAs/Ga0.52In0.48P single quantum wells grown by Metal Organic Vapor Phase Epitaxy. We have confirmed from the 77 K photoluminescence (PL) that an optimum grow...
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Chapter
Migration Mechanism of the AYU
Mechanism of fish migration was investigated based on (1) ecological, (2) endocrinological and (3) behaviourial aspects of the upstream migration of juvenile ayu Plecoglossus altivelis, amphidromous salmonoidei f...
