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http://dbpedia.org/ontology/abstract Joel Henry Hildebrand (ur. 16 listopada 1881 w Camden, zm. 30 kwietnia 1983 w Kensington) – amerykański uczony chemik, profesor, znany z pionierskich badań nad rozpuszczalnością substancji. , Joel Henry Hildebrand (November 16, 1881 – April 30, 1983) was an American educator and a pioneer chemist. He was a major figure in physical chemistry research specializing in liquids and nonelectrolyte solutions. , جويل هنري هيلدبراند (بالإنجليزية: Joel Henجويل هنري هيلدبراند (بالإنجليزية: Joel Henry Hildebrand)‏ (16 نوفمبر 1881 - 30 أبريل 1983) هو مربي وكيميائي أمريكي مميز، كان باحثًا رائدًا في بحوث الكيمياء المتخصصة في السوائل وحلول الإلكتروليت. تخرج هيلدبراند من جامعة بنسلفانيا في عام 1903، وعمل لفترة في الكلية قبل ذهابه إلى جامعة كاليفورنيا (بركلي) كأستاذ في الكيمياء عام 1913 وفي غضون 5 سنوات أصبح أستاذًا مساعدًا ثم بروفيسورًا، شغل منصب عميد كلية الكيمياء من عام 1949 حتى 1951 ثم اعتزل التدريس بدوام كامل لكنه بقي أستاذًا فخريًا في بيركلي حتى وفاته، وتم تسميت أحد قاعات الحرم الجامعي باسمه.، وتم تسميت أحد قاعات الحرم الجامعي باسمه. , Joel Henry Hildebrand (Camden, Nova JérseiJoel Henry Hildebrand (Camden, Nova Jérsei, 16 de novembro de 1881 — Kensington, Califórnia, 30 de abril de 1983) foi um educador estadunidense e um químico pioneiro. Ele foi uma figura importante na pesquisa físico-química, especializado em soluções líquidas e não eletrolíticas. em soluções líquidas e não eletrolíticas. , Joel Henry Hildebrand (* 16. November 1881Joel Henry Hildebrand (* 16. November 1881 in Camden (New Jersey); † 30. April 1983 in ) war ein US-amerikanischer Chemiker. Hildebrand interessierte sich schon auf dem College für Chemie und studierte ab 1899 Chemie und Physik an der University of Pennsylvania mit dem Bachelorabschluss 1903 und der Promotion 1906 in Chemie bei Edgar Fahs Smith mit der Arbeit The determination of anions in the electrolyte way. Er studierte an der Humboldt-Universität Berlin unter anderem bei Jacobus Henricus van ’t Hoff und Walther Nernst und lehrte danach an der University of Pennsylvania. 1913 wurde er von Gilbert Newton Lewis an die University of California, Berkeley, eingeladen, wo er Instructor, 1918 Associate Professor und 1919 Professor wurde. 1949 bis 1951 war er Dekan der Fakultät für Chemie. 1952 ging er offiziell in den Ruhestand, lehrte aber weiter an der Universität bis kurz vor seinem Tod. Eine Halle in Berkeley ist nach ihm benannt. Er galt als führender Fachmann für die physikalische Chemie von Lösungen, speziell nicht-elektrolytischer Lösungen. Hildebrand führte den Begriff regulärer Lösungen ein. Er galt auch als bedeutender Lehrer der Chemie in Berkeley. Mitte der 1920er Jahre entdeckte er den Vorteil von Helium-Sauerstoff-Gemischen beim Tauchen zur Vermeidung der Taucherkrankheit. 1953 erhielt er die Willard Gibbs Medal, 1962 die Priestley-Medaille und 1939 die Nichols Medal.Der Joel Henry Hildebrand Award der American Chemical Society wird ihm zu Ehren vergeben für Leistungen in der Chemie von Flüssigkeiten. Erster Preisträger war Hildebrand selbst 1981. Er war seit 1929 Mitglied der National Academy of Sciences und seit 1951 der American Philosophical Society. Für das Jahr 1955 wurde er zum Präsidenten der American Chemical Society gewählt. 1946 wurde er Ehrenmitglied (Honorary Fellow) der Royal Society of Edinburgh. Er war 1937 bis 1940 Präsident des Sierra Club. Mit seiner Tochter Louise schrieb er das Buch Camp Catering. Louise schrieb er das Buch Camp Catering. , Joel Henry Hildebrand (Camden, 16 novembreJoel Henry Hildebrand (Camden, 16 novembre 1881 – Kensington, 30 aprile 1983) è stato un chimico statunitense. Hildebrand frequentò l'università della Pennsylvania, laureandosi nel 1903. Nel 1913 si spostò all'Università della California, Berkeley, ove divenne Assistente Professore. Associato dal 1918, l'anno seguente completo il cursus universitario con la nomina a professore ordinario. Il 4 agosto 1919 Roger Sprague, un assistente di chimica cui Hildebrand aveva precluso una promozione, ferì con una pistola il celebre chimico e un altro professore.Fu decano del Collegio di Chimica a Berkeley dal 1949 al 1951 e si ritirò l'anno seguente dall'insegnamento, rimanendo Professore Emerito. Nel 1924 Hildebrand coniò il termine "soluzione regolare" per descrivere una classe di soluzioni reali la cui entropia di eccesso (ossia l'entropia non prevista considerando idealmente le soluzioni) è nulla, cosicché l'energia libera di Gibbs di eccesso coincida con l'entalpia di eccesso (si ricordi che per soluzioni perfette l'entalpia di mescolamento, in conseguenza dell'equazione di Gibbs-Helmholtz, è nulla). Hildebrand correlò l'entalpia di eccesso con le frazioni molari dei componenti (si parla di miscele binarie, quindi tale entalpia ha dipendenza quadratica dalla composizione) e con il fattore di non idealità ξ, dipendente dalla differente entità delle relazioni AB rispetto alla media relazioni AA e BB, deducibili dal potenziale di Lennard-Jones. La teoria di Hildebrand è rigorosa e consente di arrivare ai coefficienti di Margules e alla descrizione esatta dell' (ottimizzando l'energia di Gibbs di mescolamento rispetto a csi si trova un'equazione trascendentale la cui soluzione è ξ=2; per tale valore la curva di entalpia presenta due minimi e un massimo, che delimitano la prima lacuna di immiscibilità). Hildebrand è poi noto per aver elaborato l'omonimo parametro di solubilità :, valido per molecole non polari come molti polimeri.r molecole non polari come molti polimeri.
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rdfs:comment Joel Henry Hildebrand (ur. 16 listopada 1881 w Camden, zm. 30 kwietnia 1983 w Kensington) – amerykański uczony chemik, profesor, znany z pionierskich badań nad rozpuszczalnością substancji. , Joel Henry Hildebrand (* 16. November 1881Joel Henry Hildebrand (* 16. November 1881 in Camden (New Jersey); † 30. April 1983 in ) war ein US-amerikanischer Chemiker. Hildebrand interessierte sich schon auf dem College für Chemie und studierte ab 1899 Chemie und Physik an der University of Pennsylvania mit dem Bachelorabschluss 1903 und der Promotion 1906 in Chemie bei Edgar Fahs Smith mit der Arbeit The determination of anions in the electrolyte way. Er studierte an der Humboldt-Universität Berlin unter anderem bei Jacobus Henricus van ’t Hoff und Walther Nernst und lehrte danach an der University of Pennsylvania. 1913 wurde er von Gilbert Newton Lewis an die University of California, Berkeley, eingeladen, wo er Instructor, 1918 Associate Professor und 1919 Professor wurde. 1949 bis 1951 war er Dekan der Fakultät für Chemie. 1952war er Dekan der Fakultät für Chemie. 1952 , جويل هنري هيلدبراند (بالإنجليزية: Joel Henجويل هنري هيلدبراند (بالإنجليزية: Joel Henry Hildebrand)‏ (16 نوفمبر 1881 - 30 أبريل 1983) هو مربي وكيميائي أمريكي مميز، كان باحثًا رائدًا في بحوث الكيمياء المتخصصة في السوائل وحلول الإلكتروليت. تخرج هيلدبراند من جامعة بنسلفانيا في عام 1903، وعمل لفترة في الكلية قبل ذهابه إلى جامعة كاليفورنيا (بركلي) كأستاذ في الكيمياء عام 1913 وفي غضون 5 سنوات أصبح أستاذًا مساعدًا ثم بروفيسورًا، شغل منصب عميد كلية الكيمياء من عام 1949 حتى 1951 ثم اعتزل التدريس بدوام كامل لكنه بقي أستاذًا فخريًا في بيركلي حتى وفاته، وتم تسميت أحد قاعات الحرم الجامعي باسمه.، وتم تسميت أحد قاعات الحرم الجامعي باسمه. , Joel Henry Hildebrand (Camden, 16 novembreJoel Henry Hildebrand (Camden, 16 novembre 1881 – Kensington, 30 aprile 1983) è stato un chimico statunitense. Hildebrand frequentò l'università della Pennsylvania, laureandosi nel 1903. Nel 1913 si spostò all'Università della California, Berkeley, ove divenne Assistente Professore. Associato dal 1918, l'anno seguente completo il cursus universitario con la nomina a professore ordinario. Il 4 agosto 1919 Roger Sprague, un assistente di chimica cui Hildebrand aveva precluso una promozione, ferì con una pistola il celebre chimico e un altro professore.Fu decano del Collegio di Chimica a Berkeley dal 1949 al 1951 e si ritirò l'anno seguente dall'insegnamento, rimanendo Professore Emerito.nsegnamento, rimanendo Professore Emerito. , Joel Henry Hildebrand (Camden, Nova JérseiJoel Henry Hildebrand (Camden, Nova Jérsei, 16 de novembro de 1881 — Kensington, Califórnia, 30 de abril de 1983) foi um educador estadunidense e um químico pioneiro. Ele foi uma figura importante na pesquisa físico-química, especializado em soluções líquidas e não eletrolíticas. em soluções líquidas e não eletrolíticas. , Joel Henry Hildebrand (November 16, 1881 – April 30, 1983) was an American educator and a pioneer chemist. He was a major figure in physical chemistry research specializing in liquids and nonelectrolyte solutions.
rdfs:label Joel Henry Hildebrand , جويل هنري هيلدبراند
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