start-ver=1.4 cd-journal=joma no-vol=15 cd-vols= no-issue=1 article-no= start-page=497 end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2022 dt-pub=20221228 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Interspecific Variability in Growth Characteristics and Phytoremediation of Cu by Free-Floating Azolla Macrophytes en-subtitle= kn-subtitle= en-abstract= kn-abstract=The phytoremediation potential of aquatic plants, particularly for Cu, is scarcely reported in the pertinent literature. In this regard, differential growth behavior and phytoaccumulation ability of three free-floating Azolla species (A. japonica, A. pinnata, and A. hybrid) were evaluated in a climatically controlled (a temperature of 25/20 degrees C, light/dark 16/8 h, a light intensity of 60 mu mol m(-2) s(-1), and a relative humidity of 65%) microcosm study. Azolla plants were exposed to solutions having three Cu concentrations (0, 3, and 6 mg L-1) under two incubation periods (4 and 8 days). Different Cu treatments significantly reduced Azolla biomass during both incubation periods and A. pinnata was the most sensitive species. Azolla plants grown in aqueous solutions showed substantial variations in Cu removal capacity. Higher bioconcentration values displayed by Azolla plants indicated that these plants can be deployed as potential plants for Cu removal from Cu contaminated water. Nevertheless, the plants exposed to higher Cu concentrations displayed color changes and root detachment due to Cu phytotoxic effects which may also ultimately lead to plant death. Significant correlations between Cu removed from the aqueous solutions and Cu contents of plant biomass indicated that Cu phytoremediation by Azolla plants was due to the phytoaccumulation mechanism because the removed Cu from aqueous solutions was accumulated in plant biomass. Introduced Azolla species, i.e., A. hybrid, displayed comparable Cu removal efficiency with naturally grown Azolla species, i.e., A. japonica and A. pinnata. Tested Azolla species proved to be suitable candidates to remediate Cu contaminated water and can be deployed for phytoremediation. en-copyright= kn-copyright= en-aut-name=AkhtarMuhammad Shahbaz en-aut-sei=Akhtar en-aut-mei=Muhammad Shahbaz kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=AslamSohaib en-aut-sei=Aslam en-aut-mei=Sohaib kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=DittaAllah en-aut-sei=Ditta en-aut-mei=Allah kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=AlbalawiBedur Faleh A. en-aut-sei=Albalawi en-aut-mei=Bedur Faleh A. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=OkiYoko en-aut-sei=Oki en-aut-mei=Yoko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=NakashimaYoshitaka en-aut-sei=Nakashima en-aut-mei=Yoshitaka kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= affil-num=1 en-affil=Department of Environmental Sciences, Forman Christian College University kn-affil= affil-num=2 en-affil=Department of Environmental Sciences, Forman Christian College University kn-affil= affil-num=3 en-affil=Department of Environmental Sciences, Shaheed Benazir Bhutto University kn-affil= affil-num=4 en-affil=Department of Biology, University of Tabuk kn-affil= affil-num=5 en-affil=Department of Environmental Management Engineering, Graduate School of Environmental and Life Science, Okayama University kn-affil= affil-num=6 en-affil=Department of Environmental Management Engineering, Graduate School of Environmental and Life Science, Okayama University kn-affil= en-keyword=Azolla biomass kn-keyword=Azolla biomass en-keyword=bioconcentration factor kn-keyword=bioconcentration factor en-keyword=Cu removal efficiency kn-keyword=Cu removal efficiency en-keyword=Cu toxicity kn-keyword=Cu toxicity en-keyword=translocation factor kn-keyword=translocation factor END start-ver=1.4 cd-journal=joma no-vol=14 cd-vols= no-issue=13 article-no= start-page=1980 end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2022 dt-pub=20220621 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Backwater Effect of Clogging of Aquatic Plants at Fine-Particle Screens on Inland Flooding in Okayama en-subtitle= kn-subtitle= en-abstract= kn-abstract=In low-lying Okayama city, Japan, the heavy rainfall frequency and intensity have recently increased, subjecting the city to inland flooding. Another factor increasing the inland flooding risk is fine-particle screen clogging by aquatic plants at drainage pump stations, which obstructs drainage and causes backwater. In this study, water level simulations were conducted in drainage pump station channels to clarify the inland flooding risks with and without aquatic plant clogging-induced backwater at fine-particle screens. In the Urayasu West Drainage Pump Station channels, without backwater, no inland flooding occurred under an initial water level of 70% of the channel depth and a 40 m(3)/s discharge. However, when backwater deeper than 0.2 m occurred under the same conditions, inland flooding occurred, indicating an increased inland flooding risk associated with backwater. Additionally, we conducted an aquatic plant distribution survey in the main Okayama city channels and proposed six priority control sections based on sections with thriving aquatic plants. Although no previous inland flooding studies have considered aquatic plant clogging-induced backwater at fine-particle screens, aquatic plants cause clogging problems and drainage obstructions at water control facilities worldwide. Therefore, this study reveals the importance of conducting water level simulations and distribution surveys in areas other than Okayama city. en-copyright= kn-copyright= en-aut-name=InabaTakumi en-aut-sei=Inaba en-aut-mei=Takumi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=TsujimotoKumiko en-aut-sei=Tsujimoto en-aut-mei=Kumiko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=NakashimaYoshitaka en-aut-sei=Nakashima en-aut-mei=Yoshitaka kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= affil-num=1 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil= affil-num=2 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil= affil-num=3 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil= en-keyword=fragments of aquatic plants kn-keyword=fragments of aquatic plants en-keyword=fine-particle screens kn-keyword=fine-particle screens en-keyword=inland flooding kn-keyword=inland flooding END start-ver=1.4 cd-journal=joma no-vol=6 cd-vols= no-issue= article-no= start-page=191 end-page=205 dt-received= dt-revised= dt-accepted= dt-pub-year=2021 dt-pub=20211230 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Current Status and Issues of Japanese Language Education for Foreign Technical Interns in the Agricultural Sector :Results of apreliminary study for the development of teaching materials kn-title=農業分野における外国人技能実習生に対する日本語教育の現状と課題ー教材開発に向けた予備調査の結果から一 en-subtitle= kn-subtitle= en-abstract= kn-abstract=外国人技能実習生に対する日本語教育の課題として、介護職以外はH本語能力の受け入れ条件がないこと、受け入れ機関によって日本語教育の時間数や内容が異なること、一般的な初級教材の使用が中心で、専門分野に特化した教材開発には至っていないこと等が挙げられる。本稿では技能の専門領域の中でも「農業分野」における教材閲発のニーズを分析するために、技能実習生を受け入れている企業において実習中のベトナム人技能実習生2人、インドネシア人3人技能実習生に予備調査としてアンケート調査およびインタビュー調査を行った結果を報告する。調査の結果、来H後2年以上を経た現在は、全員から仕事上で日本語が理解できず困ることはあまりないが、渡H帥に農業分野に特化した日本語学習が必要であったという回答があった。さらには、視覚面で理解が促進できる動画教材のニーズが高いことがわかった。今後は、本調査の結果をもとに特定業種の技能実習生向けのICTを利活用した教材開発を進める予定である。 en-copyright= kn-copyright= en-aut-name=MohriTakami en-aut-sei=Mohri en-aut-mei=Takami kn-aut-name=毛利貴美 kn-aut-sei=毛利 kn-aut-mei=貴美 aut-affil-num=1 ORCID= en-aut-name=NakashimaYoshitaka en-aut-sei=Nakashima en-aut-mei=Yoshitaka kn-aut-name=中嶋佳貴 kn-aut-sei=中嶋 kn-aut-mei=佳貴 aut-affil-num=2 ORCID= affil-num=1 en-affil=Institute of Global Resource Development, Okayama University kn-affil=岡山大学グローバル人材育成院 affil-num=2 en-affil=Graduate School of Environmental and life Science, Okayama University kn-affil=岡山大学学術研究院環境生命科学学域 en-keyword=農業分野 kn-keyword=農業分野 en-keyword=外国人技能実習生 kn-keyword=外国人技能実習生 en-keyword=日本語教育 kn-keyword=日本語教育 en-keyword=教材開発 kn-keyword=教材開発 en-keyword=意識調査 kn-keyword=意識調査 END start-ver=1.4 cd-journal=joma no-vol=22 cd-vols= no-issue=1 article-no= start-page=61 end-page=64 dt-received= dt-revised= dt-accepted= dt-pub-year=2017 dt-pub=201703 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Evaluation of drop in official air temperature record at Okayama caused by relocation of observation field of Okayama Local Meteorological Observatory - By comparison with records observed at surrounding points - kn-title=岡山地方気象台観測露場移転による気温低下量の推定 en-subtitle= kn-subtitle= en-abstract= kn-abstract=Statistical change in official temperature records at Okayama City caused by relocation of meteorological observation field of Meteorological Agency was evaluated. The observation field of Okayama local meteorological observatory was moved to the Tsushima Campus of Okayama University from the downtown area of Okayama City in March, 2015. Comparison between the air temperature records measured at meteorological agency station and the records at Tanjo Pond in Tsushima Campus, showed 0.56 ℃ drop in annual average before and after relocation. Moreover, comparison between the records of Okayama local meteorological observatory and that at the surrounding meteorological observing 9 stations showed 0.55 ℃ drop in annual average. Those results suggest that the relocation dropped annual average of air temperature by about 0.6 ℃. en-copyright= kn-copyright= en-aut-name=MiuraTakeshi en-aut-sei=Miura en-aut-mei=Takeshi kn-aut-name=三浦健志 kn-aut-sei=三浦 kn-aut-mei=健志 aut-affil-num=1 ORCID= en-aut-name=UedaYu en-aut-sei=Ueda en-aut-mei=Yu kn-aut-name=上田悠生 kn-aut-sei=上田 kn-aut-mei=悠生 aut-affil-num=2 ORCID= en-aut-name=MoritaHidenori en-aut-sei=Morita en-aut-mei=Hidenori kn-aut-name=守田秀則 kn-aut-sei=守田 kn-aut-mei=秀則 aut-affil-num=3 ORCID= en-aut-name=ChikamoriHidetaka en-aut-sei=Chikamori en-aut-mei=Hidetaka kn-aut-name=近森秀高 kn-aut-sei=近森 kn-aut-mei=秀高 aut-affil-num=4 ORCID= en-aut-name=KurokawaMasahiro en-aut-sei=Kurokawa en-aut-mei=Masahiro kn-aut-name=黒川正宏 kn-aut-sei=黒川 kn-aut-mei=正宏 aut-affil-num=5 ORCID= en-aut-name=NakashimaYoshitaka en-aut-sei=Nakashima en-aut-mei=Yoshitaka kn-aut-name=中嶋佳貴 kn-aut-sei=中嶋 kn-aut-mei=佳貴 aut-affil-num=6 ORCID= en-aut-name=OkiYoko en-aut-sei=Oki en-aut-mei=Yoko kn-aut-name=沖陽子 kn-aut-sei=沖 kn-aut-mei=陽子 aut-affil-num=7 ORCID= affil-num=1 en-affil=Graduate School of Environmental and life Science, Okayama University kn-affil=岡山大学大学院環境生命科学研究科 affil-num=2 en-affil=Graduate School of Environmental and life Science, Okayama University kn-affil=岡山大学大学院環境生命科学研究科 affil-num=3 en-affil=Graduate School of Environmental and life Science, Okayama University kn-affil=岡山大学大学院環境生命科学研究科 affil-num=4 en-affil=Graduate School of Environmental and life Science, Okayama University kn-affil=岡山大学大学院環境生命科学研究科 affil-num=5 en-affil= kn-affil=岡山大学環境理工学部 affil-num=6 en-affil=Graduate School of Environmental and life Science, Okayama University kn-affil=岡山大学大学院環境生命科学研究科 affil-num=7 en-affil=Graduate School of Environmental and life Science, Okayama University kn-affil=岡山大学大学院環境生命科学研究科 en-keyword=Okayama Local Meteorological Observatory kn-keyword=Okayama Local Meteorological Observatory en-keyword=relocation kn-keyword=relocation en-keyword=drop in air temperature kn-keyword=drop in air temperature END