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Effects of soil erosion on water quality and water uses in the upper Phong watershed
Sthiannopkao, S.,Takizawa, S.,Wirojanagud, W. IWA Publishing 2006 Water Science & Technology Vol.53 No.2
<P>The main objective of this paper is to simulate the effects of soil erosion on river water quality and on agricultural production as a result of the transformation of forestlands in the catchment of the upstream Phong River. Suspended solids carry down attached nutrients and agricultural chemicals causing water pollution in the downstream. There are four different types of land use in this simulation, namely forestlands, flatland and highland sugarcane plantation areas, and paddy fields. The highest mean annual amount of soil erosion is from paddy fields (585,700 tons/year), followed by highland (73,800 tons/year) and flatland (63,950 tons/year) sugarcane plantation areas and forestlands (41,800 tons/year), respectively. However, as most of paddy fields are located in a low land and are wet type cultivations, the soil erosion occurred has less impact on river water quality and its production compared to the soil erosion from the steeper slopes of highland plantation areas. Under the resource-based agriculture, the sugarcane production is mainly increased by expanding the plantation areas leading to a significant loss of topsoil and a considerable reduction of agricultural production. Soil erosion contributes to an increase in the average annual suspended solids concentration by 72 mg/l.</P>
Kim, H. Y.,Takizawa, S.,Oh, K. The Royal Society of Chemistry 2016 Organic & biomolecular chemistry Vol.14 No.30
<P>Catalyst-dependent divergent pathways of 2-naphthol derivatives have been investigated. A readily available CuCl2-DMAP catalyst system promotes the aerobic oxidation of 2-naphthol derivatives to ortho-naphthoquinones whereas switching the catalyst system to Cu(OAc)(2)-DBN under an argon atmosphere allows the oxidative coupling of 2-naphthols to 1,1'-bi-2-naphthols (BINOLs) in good to excellent yields.</P>
Analysis on Surge Voltage in Inverter-fed Motor Using Frequency Response Analysis
M. Fujieda,Y. Takahashi,N. Kimura,T. Wakimoto,S. Nagai,N. Koshino,K. Takizawa 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In this paper, distribution of voltages between coils in inverter-fed motor and its mechanism are discussed. Insulation reliability of inverter-fed motor is one of major problems in HEV application. To ensure the reliability of insulation, enough thickness of insulation layer of coil-wire is desired to avoid partial discharge in air gap between coilwires, though the voltages between coils changes complexly due to its high frequency response. To analyze distribution of the voltages between coils, the simultaneous measurements of the voltages in various points in motor were performed. In addition, frequency response analyses of the voltages between coils were performed to understand its high frequency response. From these measurements and analysis , the fact that the LC-resonance between coil inductance and its stray capacitance causes surge voltage in motor is revealed.