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Lee, Young-June,Masami Hayashi Korean Society of Applied Entomology 2004 Journal of Asia-Pacific Entomology Vol.7 No.1
As the third part of the taxonomic review of Cicadidae (Hemiptera, Auchenorrhyncha) from Taiwan, 18 species belonging to six genera in cicadine tribes, Dundubiini (two other genera of Cicadina) and Moganiini, and a tibicinine tribe, Huechysini, are treated in this paper. A new genus, Formocicada Lee and Hayashi, and two new species, Tanna infuscata Lee and Hayashi and Formocicada taiwana Lee and Hayashi, are described. Four species are synonymized: Tanna taikosana Kato, 1925 and Tanna horiensis Kato, 1926 with Tanna taipinensis (Matsumura, 1907), and Tanna horishana Kato, 1925 and Tanna tarowanensis (Matsumura, 1927) with Tanna viridis Kato, 1925. Cryptotympana facialis (Walker, 1858), Cosmopsaltria doryca (Boisduval, 1835), and Leptopsaltria tuberosa (Signoret, 1847) are newly considered as species erroneously recorded from Taiwan. Informations on the biology and male chirpings are also provided.
CMP cross-correlation analysis of multi-channel surface-wave data
Hayashi Koichi,Suzuki Haruhiko Korean Society of Earth and Exploration Geophysici 2004 지구물리와 물리탐사 Vol.7 No.1
In this paper, we demonstrate that Common Mid-Point (CMP) cross-correlation gathers of multi-channel and multi-shot surface waves give accurate phase-velocity curves, and enable us to reconstruct two-dimensional (2D) velocity structures with high resolution. Data acquisition for CMP cross-correlation analysis is similar to acquisition for a 2D seismic reflection survey. Data processing seems similar to Common Depth-Point (CDP) analysis of 2D seismic reflection survey data, but differs in that the cross-correlation of the original waveform is calculated before making CMP gathers. Data processing in CMP cross-correlation analysis consists of the following four steps: First, cross-correlations are calculated for every pair of traces in each shot gather. Second, correlation traces having a common mid-point are gathered, and those traces that have equal spacing are stacked in the time domain. The resultant cross-correlation gathers resemble shot gathers and are referred to as CMP cross-correlation gathers. Third, a multi-channel analysis is applied to the CMP cross-correlation gathers for calculating phase velocities of surface waves. Finally, a 2D S-wave velocity profile is reconstructed through non-linear least squares inversion. Analyses of waveform data from numerical modelling and field observations indicate that the new method could greatly improve the accuracy and resolution of subsurface S-velocity structure, compared with conventional surface-wave methods.
Short-term Response of Vegetation to Cattle Grazing in an Abandoned Orchard in Southwestern Japan
Hayashi, K.,Ikeda, K.,Ueda, A.,Fumita, T.,Etoh, T.,Gotoh, T. Asian Australasian Association of Animal Productio 2006 Animal Bioscience Vol.19 No.4
An abandoned mandarin orange orchard in southwestern Japan was set-stocked by Japanese Black cows at two stocking rates (1.0 and 2.0 animals/ha), and vegetation dynamics and diet selection by cattle were monitored for two years, in an effort to obtain information on effective use of abandoned agricultural fields for low-cost animal production and environmental conservation. Two dominant species at the commencement of grazing, kudzu (Pueraria lobata Ohwi) and tall goldenrod (Solidago altissima L.), showed different responses to grazing during the two years; the composition of kudzu decreased, contrasting with that of tall goldenrod which increased at both stocking rates. This was caused by high preference for kudzu and avoidance or low preference for tall goldenrod by cattle. Retrogression of vegetation due to cattle disturbances occurred at both stocking rates, with the high stocking rate leading to a lower degree of succession than the low stocking rate. It was shown that cattle grazing, particularly at a high stocking rate, was effective in the management of vegetation of an abandoned orchard.
Hayashi, Mitsuru,Yanagi, Tetsuo,Xinyu, Guo The Korean Society of Oceanography 2004 Journal of the Korean Society of Oceanography Vol.39 No.1
Difference of Dissolved Inorganic Phosphorus (DIP), Dissolved Inorganic Nitrogen (DIN) and Dissolved Silicate (DSi) budgets in the Bohai Sea between 1982 and 1992 related the decrease of the Yellow River discharge is discussed on the basis of observed data. The estuarine circulation in the Bohai Sea had been weakened from 1982 to 1992 due to the decrease of the Yellow River discharge and the average residence time of fresh water had become longer. DIN concentration increased but DIP and DSi concentrations decreased from 1982 to 1992 in the Bohai Sea. Primary production was regulated mainly by water temperature and DIN concentration in 1982 but it was regulated mainly by DIP concentration in 1992. Primary production was larger than decomposition plus bottom release and nitrogen fixation was larger than denitrification in 1982. However, decomposition plus bottom release was larger than primary production and denitrification was larger than nitrogen fixation in 1992 in the Bohai Sea.
Studies on Microstructural Phenomena Caused by Atomic Diffusion in Sintered Materials
Hayashi, Koji The Korean Powder Metallurgy Institute 2003 한국분말재료학회지 (KPMI) Vol.10 No.6
During the sintering of powder materials, many these are microstructural phenomena are caused by atomic diffusion. (1) neck formation and compact densification, (2) grain growth, i.e., growth of matrix grains and dispersed grains, (3) alloying or generation of compound, (4) generations of peculiar and hard layers near sintered compact surface, etc. The studies of the present author and co-workers on these phenomena which were carried out during 40 years are briefly introduced.
Fabrication of Nanocomposite Powders by Sonochemical Method
Hayashi, Yamato,Sekino, Tohru,Niihara, Koichi The Korean Powder Metallurgy Institute 2001 한국분말재료학회지 (KPMI) Vol.8 No.3
Nano particles have recently been a major research interest, motivated by their unusual physical and chemical properties. Such particles can be synthesized using physical and chemical methods. The physical methods need expensive installation like vacuum induction furnace, whereas in chemical methods the process in generally very simple and low cost. In this study, simple and new fabrication process by using ultrasound was investigated to prepare the nano-sized metal particles on various powders at room temperature.