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RISS 인기검색어
- 검색키워드
- 저자 : Rikie Suzuki (검색결과 3 건)
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Suzuki, Rikie,Hiyama, Tetsuya,Asanuma, Jun,Ohata, Tetsuo,Koike, Toshio 대한원격탐사학회 2001 International Symposium on Remote Sensing Vol.17 No.1
On 9 days from April to June, 2000, airborne observations of the land surface were carried out around Yakutsk in eastern Siberia. A video camera and spectrometer were installed in the aircraft, and the non-homogeneous land surface was observed frown 100 and 150m flight heights. From the video image, the land surface was classified by a visual interpretation, and derived the proportional area of land cover types in the area. It was revealed that the left bank terrace of Lena River has more birch forest area and less no-forest area than the right bank terrace. From the spectral reflectance measurement, it was revealed that the spectral characteristics in near-infrared and visible bands has a great potential to analyze the surface vegetation property by combining the video camera data.
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Powder Neutron Diffraction Study of HoCoGa5
Riki Kobayashi,Koji Kaneko,Shuichi Wakimoto,Songxue Chi,Naoyuki Sanada,Ryuta Watanuki,Kazuya Suzuki 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We have studied successive magnetic transitions of HoCoGa5 at TN1 = 9.6 K and TN2 = 7.5 Kby using powder neutron diffraction. Apparent superlattice peaks were observed at temperaturesbelow TN1. With further decreases temperature, the patterns exhibit a substantial change at temperaturesbelow TN2. The observed magnetic peaks at 8 K (AntiFerromagnetic InCommensurate(AFIC) phase : TN2 < T < TN1) can be represented by the propagation vector qL = (1/2 0 ) with = 0.35(2). In contrast, the magnetic structure becomes commensurate with qC = (1/2 0 1/2) at4 K (AntiFerromagnetic Commensurate (AFC) phase : T < TN2). The temperature dependence ofmagnetic intensity shows an apparent temperature hysteresis at TN2, indicates a first-order transitionat TN2. Analysis of the integrated intensity at 4 K reveals that the Ho moment with a sizeof 8.6(2) µB, oriented parallel to the c-axis in the AFC phase. While the successive transitionsof HoCoGa5 are different from those of TbCoGa5, the magnetic structure in the AFC phase ofHoCoGa5 is the same as the AFTbI of TbCoGa5, and may indicate an additional transition at alower temperature in HoCoGa5.
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Shin Nagai,Taku M. Saitoh,Rikie Suzuki,Kenlo Nishida Nasahara,이우균,손요환,Hiroyuki Muraoka 한국산림과학회 2011 Forest Science And Technology Vol.7 No.4
General, global, long-term, and comprehensive phenological observations are required to evaluate the variability of photosynthetic activities due to environmental changes in terrestrial ecosystems. The observation of seasonal changes and detection of interannual variation in canopy phenology over regional and global scales require satellite data with high temporal resolution (i.e. a daily time step). However, satellite data often include noise caused by snow cover on vegetation, cloud contamination, and atmospheric aerosols. To accurately detect the timing of leaf-expansion and leaf-fall, which occur rapidly, and their rates, it is necessary to examine the observational frequency of noise-free satellite-observed vegetation index data during each phenological period. In this study, we investigated the spatiotemporal distribution of the number of observational days (NUMdays) in the Terra/MODIS (Moderate Resolution Imaging Spectroradiometer)-observed daily high-quality normalized difference vegetation index (NDVIhigh) data with no effects of snow cover, cloud contamination, or atmospheric noise. These data were examined for each month over 10 years in the various ecosystems of East Asia. To ground-truth the relationship between the Terra/MODISobserved daily NDVIhigh data and canopy surface images, we performed a long-term continuous field study in a cooltemperate deciduous broad-leaved forest in central Japan. During the leaf-expansion and leaf-fall periods, the NUMdays for NDVIhigh data in southern Russia, northeastern China, the Tibetan Plateau, Korea, and maritime Japan was about 3–7 for each month. The NUMdays for NDVIhigh data exceeded 10 for each month in arid regions during the growing season and in the subtropical region including northeastern India, Myanmar, and southwestern China during the dry season. In contrast, the NUMdays for NDVIhigh data was almost 0 for each month in southeastern China throughout the year and in the subtropical region during the southeastern monsoon season (July and August). By considering observations from both the Terra/MODIS and Aqua/MODIS satellites, the NUMdays for NDVIhigh data in the deciduous broad-leaved forest in Japan was increased by 40% compared with only Terra/MODIS satellite observations. Our findings indicate that daily NDVI data from multiple satellites detect the seasonal changes in the various ecosystems of East Asia more accurately than 8-day or biweekly composite NDVI data.
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