コウトウガッコウノウギョウカ ニ オケル チサンチショウ ヤ シュンサンシュウショウ ト ニサンカタンソハイシュツ ト ノ カンケイ ヲ ダイザイ ト シタ ジュギョウジッセン ト ソノ ヒョウカ

高等学校農業科の生徒を対象として，持続可能な食料の生産と消費の実現に向けた意識を醸成するために，科目「農業と環境」において食料の生産と輸送段階における二酸化炭素の排出量削減を題材とした授業を考案して実践した。授業実践は，「地産地消」，「フードマイレージ」および「旬産旬消」の概念を含む内容とした。授業実践前後の質問紙調査，授業実践で使用したワークシートへの生徒の記述内容および授業実践後の感想を基に生徒の意識の変容を評価した。事前の質問紙調査では，地産地消の認知度は高かった。フードマイレージおよび旬産旬消の認知度は，地産地消よりも低かった。事後の質問紙調査では，地産地消や旬産旬消の取り組みは環境によいと考える生徒が増加していた。この結果から，本研究で考案した授業実践により，環境に配慮した農業生産や食料消費をしようとする意識の醸成につながると考えられた。To raise awareness about sustainable food production and consumption, a class focusing on reducing CO2 emissions during food production and transportation was designed and offered to students in the agricultural department of a high school. The concepts incorporated in the class were “local production for local consumption,” “food miles,” and “seasonal production for seasonal consumption.” Changes in student awareness were evaluated by conducting questionnaire surveys before and after the class, by student descriptions completed on class worksheets, and by student impressions of the class. The pre-class questionnaire survey showed that the students’ awareness of the concept “local production for local consumption” was high, whereas prior understanding of the concepts of “food miles” and “seasonal production for seasonal consumption” were lower. The post-class questionnaire survey showed that an increased number of students thought that initiatives promoting local production for local consumption and seasonal production for seasonal consumption were good for the environment. Therefore, the class helped to foster positive attitudes toward environmentally conscious agricultural production and food consumption among the students

Transmission electron microscopic observations of nanobubbles and their capture of impurities in wastewater

Unique properties of micro- and nanobubbles (MNBs), such as a high adsorption of impurities on their surface, are difficult to verify because MNBs are too small to observe directly. We thus used a transmission electron microscope (TEM) with the freeze-fractured replica method to observe oxygen (O2) MNBs in solutions. MNBs in pure water and in 1% NaCl solutions were spherical or oval. Their size distribution estimated from TEM images close to that of the original solution is measured by light-scattered methods. When we applied this technique to the observation of O2 MNBs formed in the wastewater of a sewage plant, we found the characteristic features of spherical MNBs that adsorbed surrounding impurity particles on their surface

Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements