著者

佐伯 竜彦 富山 潤 中村 文則 中村 亮太 花岡 大伸 安 琳 佐々木 厳 遠藤 裕丈

出版者

公益社団法人 土木学会

雑誌

土木学会論文集E2(材料・コンクリート構造)

巻号頁・発行日

vol.76, no.2, pp.98-108, 2020

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<p> 本研究は,同一の薄板モルタル供試体を用いて,日本各地の101か所において暴露試験を行い,飛来塩分環境を評価した.暴露供試体への塩化物イオン浸透量をコンクリートの表面塩化物イオン濃度に換算し,標高,風向,波エネルギーの影響を考慮して離岸距離を補正した,「補正距離」によって,地域によらず一律に表面塩化物イオン濃度を評価できる推定式を提案した.</p>

著者

中村 文則 小林 豪毅 高木 利光 児玉 敏雄

出版者

公益社団法人 土木学会

雑誌

土木学会論文集B2(海岸工学) (ISSN:18842399)

巻号頁・発行日

vol.67, no.2, pp.I_1056-I_1060, 2011

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Many concrete and steel structures near shoreline are damaged severely by generated salt spray from sea surface. To reduce the transportation of salt spray near shoreline is effective method of prevention of salt damage. In this study, to discuss the effect of the structure on the reduction of salt spray concentration, experiments of transportation of salt spray were carried out. The wind velocity and the distribution of salt spray concentration around the permeable structures were measured in the wind tunnel. In this result, the structure that set up filters can effectively reduce the transportation of salt spray concentration, the experiment data showed that the decrease of salt spray concentration is influenced from the salt amount of adhesion of structures.

著者

大島 正明 中村 文則 玉井 伸三 山本 融真 森 治義

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. D, 産業応用部門誌 = The transactions of the Institute of Electrical Engineers of Japan. D, A publication of Industry Applications Society (ISSN:09136339)

巻号頁・発行日

vol.120, no.1, pp.104-111, 2000-01

参考文献数

12

被引用文献数

3 1

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This paper proposes a novel single-phase UPS inverter modulated by Error-Tracking Mode PWM scheme. An ac voltage regulation scheme which matches the PWM scheme is newly developed in a theoretical way. Since Error-tracking Mode PWM is based on constantly-sampled data, the controller is suited to be digitally implemented. The equivalent circuit of the UPS inverter controlled by the schemes is derived. The output impedence is found to be composed mainly of resistance differently from general ac apparatus.<br>According to the newly-developed schemes, a 3kVA, 100V, 50Hz UPS inverter is experimentally fabricated in which the sample period is 10μs and the average switching frequency is 6kHz. No load, linear load and non-linear load characteristics are measured. The output voltage remains almost sinusoidal even for the rated non-linear load. The output impedences are also measured and well agreed with the intended values.