DSpace コレクション: 2001-06

連続波形Walsh直接拡散コードを用いた差分CDMAへのBCH誤り訂正符号の特殊符号方式の適用

2025-08-19T05:35:31Z

タイトル: 連続波形Walsh直接拡散コードを用いた差分CDMAへのBCH誤り訂正符号の特殊符号方式の適用著者: 殷, 奎喜; 岸, 政七抄録: In this paper, the new generator of continuous Walsh code as spread - spectrum code and the new decoding method of BCH code as t-error correction (t〓2) code are applied to differential coding CDMA (abbreviated in diffCDMA) system. In this diffCDMA system, the instantaneous phase has already proposed in [1] and [2]. As three important technologies to improve high capacity and conquer the fatal transmission error when communications are carried from high speed running mobiles through such urban environment as rapid multi-ray Rayleigh channel. The error correction technologies are discussed in diffCDMA system with continuous Walsh code from the view points both of mathematical problems for communication theory and electronic circuit implementation.

環境中の合成高分子化合物による由来物質及び環境ホルモン化合物の動態解析(3) : ハロゲン化芳香族化合物の光化学的脱ハロゲン化

2025-08-19T05:29:07Z

タイトル: 環境中の合成高分子化合物による由来物質及び環境ホルモン化合物の動態解析(3) : ハロゲン化芳香族化合物の光化学的脱ハロゲン化　著者: 立木, 次郎; 伊澤, 康司抄録: Photochemical dehalogenation of halogenated isatin derivatives in degassed soluions was investigated Photochemical reactions of 5-bromo-1-alkylisatins gave 1-alkyloxyindoles in good yield Irradiation of 5-bromo-1-metbyl-7-azaisatin in degassed alcohols afforded 5-brom0-7-azaoxindole and 7-azaoxindole as major products. Photoreactions of 7-chloro-1-alkylisatins gave and l-alkyloxindoles via 7-chlor0-1-alkyloxindoles.

環境中の合成高分子化合物による由来物質及び環境ホルモン化合物の動態解析(2) : アナターゼ型TiO_2結晶粉末の合成と光触媒能

2025-08-19T05:28:38Z

タイトル: 環境中の合成高分子化合物による由来物質及び環境ホルモン化合物の動態解析(2) : アナターゼ型TiO_2結晶粉末の合成と光触媒能　著者: 稲垣, 道夫; 佐藤, 啓次; 平野, 正典; 小林, 雄一; 豊田, 昌宏抄録: Anataze-type TiO_2 crystalline powders were synthesized under hydrothermal conditon at 180℃ for 1 h from different precursors. Titanium oxisulfate TiOSO_4 was found to give stable anatase crystals even after annealing at 700℃ for 1 h. Anatase-type TiO_2 annealed at 700℃ showed very high photocatalytic activity for the decomposition of methyleneblue and ipuconazole in aqueous solutions.

環境中の合成高分子化合物による由来物質及び環境ホルモン化合物の動態解析(1) : NO_x, SO_xの環境動態とフェノールの高感度計測

2025-08-19T05:27:31Z

タイトル: 環境中の合成高分子化合物による由来物質及び環境ホルモン化合物の動態解析(1) : NO_x, SO_xの環境動態とフェノールの高感度計測　著者: 酒井, 忠雄; 手嶋, 紀雄抄録: The dynamics of nitrogen oxides and sulfur oxides as pollutants in air and water samples collected at Nagoya and its environs were investigated by using flow injection (FI) technique. Nitrogen monoxide (NO), nitrogen dioxide (NO_2) and sulfur dioxide (SO_2) as air pollutants were collected by the passive sampling device. NO and NO_2 were determined based on a diazotization/coupling reaction with the copperized cadmium (Cd/Cu) reduction column installed in the FI system. Another FI method using dimethylsulfonazo III-barium chelate was used for SO2 determination. These proposed FI methods were also applied to the monitoring the concentrations of nitrite nitrogen (N-NO_2) and nitrate nitrogen (N-NO_3) in river water, pond water, rainwater and seawater, and of sulfate ion in seawater. In addition, a sensitive spectrophotometry for the determination of phenol using a solid-phase extraction cartridge was developed. It is based on the oxidative coupling of 4-aminoantipyrine with phenol to form an azo compound (aminoantipyrine dye) in the presence of hexacyanoferrate(III) at pH 10. The proposed method using Sep-Pak C_<18> or Porapak R_ cartridge showed a high enrichment factor (10-100) and made it possible to determine the 1-8 ng ml-<-1> level of phenol with a low relative standard deviation. The recoveries of ng ml^<-1> levels of phenol added to tap water were satisfactory for both cartridges.