市街地の老朽化下水管から生活排水が広範に漏出、広島大学がカフェイン濃度で発見 大学ジャーナルオンライン編集部 広島大学大学院の尾崎則篤准教授らの研究グループは、老朽化した下水管（汚水管）を持つ市街地で、雨水流出管でカフェインを検出することによって下水管からの漏出が雨水管の水質に影響を与えている可能性を見出した。 排水管漏水の診断には、カメラによる直接観察、スポット漏水測定、管の状態監視、トレーサー試験などの方法が開発されているが、漏水率の推定は大きく異なる。これは地下環境の空間的・時間的な変動が影響していると考えられ、これらの影響を広域に確認する研究や調査方法は十分に発展していない。 研究グループは、比較的最近整備された市街地（10年程度）から40年以上経過した市街地まで、異なる5つの市街地の雨水流出管で、カフェイン、香料物質、多環芳香族炭化水素をトレーサーとしたモニタリングを行った。そし
Trump rally: American politics enters a dark and dangerous new chapter
By Anthony Zurcher, @awzurcher, North America correspondent A spray of bullets may have only grazed Donald Trump in Pennsylvania on Saturday night, but they killed one rally attendee and critically wounded two others. They have also torn through the 2024 presidential campaign, damaging the social and cultural fabric of the nation. The illusion of security and safety in American politics – built ov
The southern islands of Okinawa host the bulk of US forces in Japan A US soldier has been charged with the kidnapping and rape of a teenage girl in Okinawa, a Japanese island chain that hosts the region's largest American military base. The case is likely to stoke the long-standing local opposition to US military presence - the islands are home to more than half of the 54,000 US soldiers serving i
Are animals conscious? How new research is changing minds Charles Darwin enjoys a near god-like status among scientists for his theory of evolution. But his ideas that animals are conscious in the same way humans are have long been shunned. Until now. "There is no fundamental difference between man and animals in their ability to feel pleasure and pain, happiness, and misery," Darwin wrote. But hi
Initially, we named this guide “Tourist Attractions in Tokyo,” but we realized that the title did not do justice. Tokyo offers so many places to visit and things to do that even most long-time residents might not be able to experience them all. So, whether you plan to visit Tokyo as a tourist, for business, or to live there, we hope this guide to Tokyo’s attractions will be useful to everyone equa
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市街地の老朽化下水管から生活排水が広範に漏出、広島大学がカフェイン濃度で発見
US soldier charged in Okinawa for rape of minor
Are animals conscious? Some scientists now think they are
Top Places to Visit and the Best Things to Do in Tokyo