[B! 物理] R2Mのブックマーク

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https://mond.how/ja/<a data-gtm-click-label="entry-summary-keyword" href="/q/Topic">topic</a>s/25cvmio3xol00zd/t242v2yde410hdy https://b.<a data-gtm-click-label="entry-summary-keyword" href="/q/hatena">hatena</a>.ne.jp/entry/s/mond.how/ja/<a data-gtm-click-label="entry-summary-keyword" href="/q/Topic">topic</a>s/25cvmio3xol00zd/t242v2yde410hdy 「エントロピー」は名前自体は比較的よく知られているものの、「何を意味しているのか今一つ分からない」という人の多い概念である。その理由の一つは、きちんと理解するためには一定レベルの<a data-gtm-click-label="entry-summary-keyword" href="/q/%E6%95%B0%E5%AD%A6">数学</a>的概念（特に、微積分と対数）の理解が必要とされるからであろう。これらを避けて説明しようとしても、「結局何を言いたいのかすっきりしない」という印象になってしまいやすい。「エントロピー」を理解し難いものにしているもう一つの理由は、「エントロピー」という概念が生まれた<a data-gtm-click-label="entry-summary-keyword" href="/q/%E6%AD%B4%E5%8F%B2">歴史</a>的経緯</p> <a href="https://anond.hatelabo.jp/20230916001142" class="centerarticle-entry-image" target="_blank" rel="noopener" data-gtm-click-label="user-bookmark-thumb"> <img 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class="js-add-star-container add-star-container"></li> </ul> </div> </div> </div> </div> <ul class="centerarticle-reaction-following js-user-following-bookmarks-icon"> </ul> <div class="js-user-following-bookmarks-detail is-hidden"> </div> </li> <li class="bookmark-item js-user-bookmark-item js-intent-share-bookmark" data-target-url="https://mond.how/topics/ja7xb0crnuiml9x/0289mmc858uhw99"> <div class="centerarticle-entry is-image-entry-unit"> <h3 class="centerarticle-entry-title"> <a href="https://mond.how/topics/ja7xb0crnuiml9x/0289mmc858uhw99" class="js-clickable-link js-keyboard-openable" target="_blank" rel="noopener" data-gtm-click-label="user-bookmark-title"><img class="centerarticle-entry-favicon" src="https://cdn-ak2.favicon.st-hatena.com/64?url=https%3A%2F%2Fmond.how%2Ftopics%2Fja7xb0crnuiml9x%2F0289mmc858uhw99" alt="">磁石って分子レベルに切っても磁石なんですか？ | mond</a> </h3> <ul class="centerarticle-entry-data"> <li> <span class="centerarticle-users"> <a href="/entry/s/mond.how/topics/ja7xb0crnuiml9x/0289mmc858uhw99" class="js-keyboard-entry-page-openable" title="磁石って分子レベルに切っても磁石なんですか？ | mond (455ブックマーク)" data-gtm-click-label="user-bookmark-users">455 users</a> </span> </li> <li> <a href="/R2M/?url=https%3A%2F%2Fmond.how%2F" title="『mond.how』の新着エントリー" data-gtm-click-label="user-bookmark-domain"> mond.how </a> </li> <li><a href="/hotentry/it" data-gtm-click-label="user-bookmark-category">テクノロジー</a></li> </ul> <div class="centerarticle-entry-contents"> <p class="centerarticle-entry-summary">抜群によい質問です。簡潔でかつ奥が深い。身近な現象と量子論の深いメカニズムをつなげる<a data-gtm-click-label="entry-summary-keyword" href="/q/%E6%9C%AC">本</a>質的な問いです。何が言いたいかというと、難しくて私にはちゃんと説明できません。どうしましょう。でもこれでは答えになっていませんね。少し考えてみましょう。棒磁石を２つに折って分けるととアラ不思議、折ったところにN極とS極が勝手に現れて、２つの磁石ができあがる。だったらもっと折ってみたらどうだろう。４つ、８つ、...。どこまで小さく折っても磁石のままなんだろうか。もっともな疑問ですよね。分子レベルになったらどうだろう。それは場合によるでしょう。でも確実に言えるのは、もっと分解して原子核と電子に分けてみたときです。そう。１つの電子は磁石なのです。電子は自転しています（スピンといいます）。電荷をもつものが回転すると磁石になります。電子は小さな素粒子ですが、一つの立派な磁石です。問題は、原子や分子など、大きく</p> <a href="https://mond.how/topics/ja7xb0crnuiml9x/0289mmc858uhw99" class="centerarticle-entry-image" target="_blank" rel="noopener" data-gtm-click-label="user-bookmark-thumb"> <img src="https://cdn-ak-scissors.b.st-hatena.com/image/square/453958e9ab9e2653d8450ed0ceb4cb2876aeaf7b/height=288;version=1;width=512/https%3A%2F%2Fasia-northeast1-pjt-knowledge.cloudfunctions.net%2Fogp_image%3Fq%3Dt%3Aja7xb0crnuiml9x%3A2371d2214727d0d3c7f89004b022b5d54e63fb53" alt="磁石って分子レベルに切っても磁石なんですか？ | mond"> </a> </div> </div> <div class="centerarticle-reaction js-user-bookmark-id-container" id="bookmark-4719778268352879586"> <div 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</div> <ul class="centerarticle-reaction-menu"> <li class="js-add-star-container add-star-container"></li> </ul> </div> </div> </div> </div> <ul class="centerarticle-reaction-following js-user-following-bookmarks-icon"> </ul> <div class="js-user-following-bookmarks-detail is-hidden"> </div> </li> <li class="bookmark-item js-user-bookmark-item js-intent-share-bookmark" data-target-url="https://www.kyodo.co.jp/pr/2019-10-14_2304495/"> <div class="centerarticle-entry "> <h3 class="centerarticle-entry-title"> <a href="https://www.kyodo.co.jp/pr/2019-10-14_2304495/" class="js-clickable-link js-keyboard-openable" target="_blank" rel="noopener" data-gtm-click-label="user-bookmark-title"><img class="centerarticle-entry-favicon" src="https://cdn-ak2.favicon.st-hatena.com/64?url=https%3A%2F%2Fwww.kyodo.co.jp%2Fpr%2F2019-10-14_2304495%2F" alt="">「磁石を金属に近づけるとどうなる？」に答える初めての厳密な量子理論 | 株式会社共同通信社</a> </h3> <ul class="centerarticle-entry-data"> <li> <span class="centerarticle-users"> <a href="/entry/s/www.kyodo.co.jp/pr/2019-10-14_2304495/" class="js-keyboard-entry-page-openable" title="「磁石を金属に近づけるとどうなる？」に答える初めての厳密な量子理論 | 株式会社共同通信社 (30ブックマーク)" data-gtm-click-label="user-bookmark-users">30 users</a> </span> </li> <li> <a href="/R2M/?url=https%3A%2F%2Fwww.kyodo.co.jp%2F" title="『www.kyodo.co.jp』の新着エントリー" data-gtm-click-label="user-bookmark-domain"> www.kyodo.co.jp </a> </li> <li><a href="/hotentry/knowledge" data-gtm-click-label="user-bookmark-category">学び</a></li> </ul> <div class="centerarticle-entry-contents"> <p class="centerarticle-entry-summary">Tweet 2019年10月14日国立大学法人　電気通信大学　情報理工学研究科基盤理工学専攻「磁石を金属に近づけるとどうなる？」この質問自体は子供でも理解できる単純なものですが，量子論に基づいて正確に答えることは，長らく困難とされてきました．電気通信大学大学院基盤理工学専攻の伏屋雄紀准教授らは，今回この理論的困難を克服し，磁場によって量子化される固体電子のエネルギーを初めて厳密に求めることに成功しました．発表<a data-gtm-click-label="entry-summary-keyword" href="/q/%E6%9C%AC">本</a>誌リンク：https://doi.org/10.1103/PhysRevLett.123.156403 伏屋　研究室：http://www.kook<a data-gtm-click-label="entry-summary-keyword" href="/q/ai">ai</a>.<a data-gtm-click-label="entry-summary-keyword" href="/q/PC">pc</a>.uec.ac.jp/ 電気通信大学情報理工学研究科　基盤理工学専攻: http://www.es.uec.ac.jp/ 磁場は物理学のみならず，自然科学において極めて基<a data-gtm-click-label="entry-summary-keyword" href="/q/%E6%9C%AC">本</a>的で重要な存在です．しかし身近な存在であるはずの磁</p> </div> </div> <div class="centerarticle-reaction js-user-bookmark-id-container" id="bookmark-4675804839403781890"> <div class="centerarticle-reaction-comment js-user-bookmark-comment " data-url="https://www.kyodo.co.jp/pr/2019-10-14_2304495/" data-user-name="R2M"> <a href="/R2M/" data-gtm-click-label="user-reaction-usericon" class="centerarticle-reaction-thumb"> <img src="https://cdn.profile-image.st-hatena.com/users/R2M/profile.png" alt="R2M" title="R2M" class="centerarticle-reaction-image"> </a> <div class="centerarticle-reaction-main"> <span class="centerarticle-reaction-username"><a href="https://b.hatena.ne.jp/R2M/20191015#bookmark-4675804839403781890" class="js-anchor-path" 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class="centerarticle-entry-contents"> <p class="centerarticle-entry-summary">宇宙空間にできた「ゆがみ」が波となって伝わる現象、いわゆる「重力波」の２回目の観測に成功したと、<a data-gtm-click-label="entry-summary-keyword" href="/q/%E3%82%A2%E3%83%A1%E3%83%AA%E3%82%AB">アメリカ</a>を中心とした国際研究チームが発表し、今後のさらなる観測に期待が高まっています。「重力波」は、ブラックホールなどの天体によって生み出された宇宙空間の「ゆがみ」が波となって伝わる現象で、アインシュタインが１００年前に存在を予測し、ＬＩＧＯが、初めて観測に成功したと、ことし２月に発表しました。研究チームは今回、２つのブラックホールが合体するときに出た１４億年前の重力波を新たに観測したということです。初めて重力波が観測されたのは去年９月で、２回目にあたる今回の観測はその３か月後でした。相次いで、重力波が観測されたことで、これまでの観測手段では見つからなかったブラックホールの分布や、今後の重力波の観測の頻度などを予想するのに役立つとしています。研究チームによりますと、さらにまた、重力波が観測</p> </div> </div> <div class="centerarticle-reaction js-user-bookmark-id-container" id="bookmark-290710089"> <div class="centerarticle-reaction-comment js-user-bookmark-comment " data-url="http://www3.nhk.or.jp/news/html/20160616/k10010557991000.html" data-user-name="R2M"> <a href="/R2M/" data-gtm-click-label="user-reaction-usericon" class="centerarticle-reaction-thumb"> <img 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29太陽質量のブラックホール同士の合体です。起こった場所は正確にはわからないですが、我々からの距離はわかっていて13億光年です。何故重力波を観測したというだけでブラックホールであるとか質量とか距離がいきなりわかるのか、というと、ブラックホールの合体、というイベントを考えると、その最重要なパラメータは質量です。合計の質量で最後の合体の瞬間にでてくる重力波の周期が決まり、質量の比もわかると振幅の絶対値が決まります。さらに、最後の合体の前の数回転でどれくらいの速さで軌道が縮んだか、ということか</p> </div> </div> <div class="centerarticle-reaction js-user-bookmark-id-container" id="bookmark-278840305"> <div class="centerarticle-reaction-comment js-user-bookmark-comment " data-url="http://jun-makino.sakura.ne.jp/articles/future_sc/note131.html" data-user-name="R2M"> <a href="/R2M/" data-gtm-click-label="user-reaction-usericon" class="centerarticle-reaction-thumb"> <img src="https://cdn.profile-image.st-hatena.com/users/R2M/profile.png" alt="R2M" title="R2M" class="centerarticle-reaction-image"> </a> <div class="centerarticle-reaction-main"> <span class="centerarticle-reaction-username"><a href="https://b.hatena.ne.jp/R2M/20160226#bookmark-278840305" class="js-anchor-path" data-gtm-click-label="user-reaction-username">R2M</a></span> 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href="/q/nim">NIM</a>Sは以前、鉄系超伝導関連物質の鉄テルル化合物を酒中で煮ると超伝導体に変わることを発見したが、今回、慶應義塾大学先端生命科学研究所との共同研究により、酒中に含まれる超伝導誘発物質を同定し、その誘発メカニズムを明らかにした。独立行政法人物質・材料研究機構 (理事長 : 潮田資勝、茨城県つくば市、以下<a data-gtm-click-label="entry-summary-keyword" href="/q/nim">NIM</a>S) は、鉄系超伝導関連物質である鉄テルル化合物〔Fe(Te,S)系〕を酒中で煮ると超伝導体に変わることを発見した (平成22年7月27日　<a data-gtm-click-label="entry-summary-keyword" href="/q/nim">NIM</a>S - 独立行政法人科学<a data-gtm-click-label="entry-summary-keyword" href="/q/%E6%8A%80%E8%A1%93">技術</a>振興機構 (以下JST) 共同プレス発表) 。今回、慶應義塾大学　先端生命科学研究所 (所長 : 冨田勝、山形県鶴岡市、以下慶應大先端研) との共同研究により、酒中に含まれる超伝導誘発物質を同定し、その誘発メカニズムを明らかにした。慶應大先端</p> <a href="http://www.nims.go.jp/news/press/2012/07/p201207130.html" class="centerarticle-entry-image" target="_blank" rel="noopener" data-gtm-click-label="user-bookmark-thumb"> <img src="https://cdn-ak-scissors.b.st-hatena.com/image/square/2414f3cd43202a41cca5a343ec4b105c6018b8fc/height=288;version=1;width=512/https%3A%2F%2Fwww.nims.go.jp%2Fnews%2Fpress%2F2012%2F07%2F201207130%2Fimg3.jpg" 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</li> <li class="bookmark-item js-user-bookmark-item js-intent-share-bookmark" data-target-url="http://ja.wikipedia.org/wiki/%E6%BA%96%E7%B2%92%E5%AD%90"> <div class="centerarticle-entry "> <h3 class="centerarticle-entry-title"> <a href="http://ja.wikipedia.org/wiki/%E6%BA%96%E7%B2%92%E5%AD%90" class="js-clickable-link js-keyboard-openable" target="_blank" rel="noopener" data-gtm-click-label="user-bookmark-title"><img class="centerarticle-entry-favicon" src="https://cdn-ak2.favicon.st-hatena.com/64?url=https%3A%2F%2Fja.wikipedia.org%2Fwiki%2F%25E6%25BA%2596%25E7%25B2%2592%25E5%25AD%2590" alt="">準粒子 - Wikipedia</a> </h3> <ul class="centerarticle-entry-data"> <li> <span class="centerarticle-users"> <a href="/entry/s/ja.wikipedia.org/wiki/%E6%BA%96%E7%B2%92%E5%AD%90" class="js-keyboard-entry-page-openable" title="準粒子 - Wikipedia (3ブックマーク)" data-gtm-click-label="user-bookmark-users">3 users</a> </span> </li> <li> <a href="/R2M/?url=https%3A%2F%2Fja.wikipedia.org%2F" 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