Goethe Institut Transatlantic Outreach Program (#5, June 27-July 12, 2008)
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Franck-Hertz Experiment
IIA2 Modul Atomic/Nuclear Physics Franck-Hertz Experiment This experiment by JAMES FRANCK and GUSTAV LUDWIG HERTZ from 1914 (Nobel Prize 1926) is one of the most impressive comparisons in the search for quantum theory: it shows a very simple arrangement in the existence of discrete stationary energy states of the electrons in the atoms. ÜÔ ÖÑÒØ Á Á¾ ¹ ÜÔ ÖÑÒØ This experiment by JAMES FRANCK and GUSTAV LUDWIG HERTZ from 1914 (Nobel Prize 1926) is one of the most impressive comparisons in the search for quantum theory: it shows a very simple arrangement in the existence of discrete stationary energy states of the electrons in the atoms. c AP, Department of Physics, University of Basel, September 2016 1.1 Preliminary Questions • Explain the FRANCK-HERTZ experiment in our own words. • What is the meaning of the unit eV and how is it defined? • Which experiment can verify the 1. excitation energy as well? • Why is an anode used in the tube? Why is the current not measured directly at the grid? 1.2 Theory 1.2.1 Light emission and absorption in the atom There has always been the question of the microscopic nature of matter, which is a key object of physical research. An important experimental approach in the "world of atoms "is the study of light absorption and emission of light from matter, that the accidental investigation of the spectral distribution of light absorbed or emitted by a particular substance. The strange phenomenon was observed (first from FRAUNHOFER with the spectrum of sunlight), and was unexplained until the beginning of this century when it finally appeared: • If light is a continuous spectrum (for example, incandescent light) through a gas of a particular type of atom, and subsequently , the spectrum is observed, it is found that the light is very special, atom dependent wavelengths have been absorbed by the gas and therefore, the spectrum is absent. -
書 名 等 発行年 出版社 受賞年 備考 N1 Ueber Das Zustandekommen Der
書 名 等 発行年 出版社 受賞年 備考 Ueber das Zustandekommen der Diphtherie-immunitat und der Tetanus-Immunitat bei thieren / Emil Adolf N1 1890 Georg thieme 1901 von Behring N2 Diphtherie und tetanus immunitaet / Emil Adolf von Behring und Kitasato 19-- [Akitomo Matsuki] 1901 Malarial fever its cause, prevention and treatment containing full details for the use of travellers, University press of N3 1902 1902 sportsmen, soldiers, and residents in malarious places / by Ronald Ross liverpool Ueber die Anwendung von concentrirten chemischen Lichtstrahlen in der Medicin / von Prof. Dr. Niels N4 1899 F.C.W.Vogel 1903 Ryberg Finsen Mit 4 Abbildungen und 2 Tafeln Twenty-five years of objective study of the higher nervous activity (behaviour) of animals / Ivan N5 Petrovitch Pavlov ; translated and edited by W. Horsley Gantt ; with the collaboration of G. Volborth ; and c1928 International Publishing 1904 an introduction by Walter B. Cannon Conditioned reflexes : an investigation of the physiological activity of the cerebral cortex / by Ivan Oxford University N6 1927 1904 Petrovitch Pavlov ; translated and edited by G.V. Anrep Press N7 Die Ätiologie und die Bekämpfung der Tuberkulose / Robert Koch ; eingeleitet von M. Kirchner 1912 J.A.Barth 1905 N8 Neue Darstellung vom histologischen Bau des Centralnervensystems / von Santiago Ramón y Cajal 1893 Veit 1906 Traité des fiévres palustres : avec la description des microbes du paludisme / par Charles Louis Alphonse N9 1884 Octave Doin 1907 Laveran N10 Embryologie des Scorpions / von Ilya Ilyich Mechnikov 1870 Wilhelm Engelmann 1908 Immunität bei Infektionskrankheiten / Ilya Ilyich Mechnikov ; einzig autorisierte übersetzung von Julius N11 1902 Gustav Fischer 1908 Meyer Die experimentelle Chemotherapie der Spirillosen : Syphilis, Rückfallfieber, Hühnerspirillose, Frambösie / N12 1910 J.Springer 1908 von Paul Ehrlich und S. -
Goverdhan Mehta Chemistry - a 21St Century Science for Global Sustainability: Is It Future Ready?
Goverdhan Mehta Chemistry - A 21st Century Science for Global Sustainability: Is it future ready? Goverdhan Mehta A ‘selfie’ with theSchool chemical of Chemistry world…… University of Hyderabad National Geophysical Research Institute, CSIR Foundation Day, Sept. 27, 2019 Introducing Chemistry through the Lens of Earth's Systems: What Role Can Systems Thinking Play in Developing Chemically and Environmentally Literate Citizens? J. Kornfeld, S. Stokoe. J. Chemical Education 2019, 96, 2910-2917 A bouquet of ‘matters’ that matter New symbols Passion Sustainability Legacies Ethics & values Responsible Connections Systems Directions Humility Ideas & icons Inspirations Un mélange de beaucoup de choses “Chemistry ought not to be for chemists alone” - Miguel de Unamuno ‘…Life, Universe and Everything’ Chemistry – a source of happiness…. Chem -Connectome ‘...I feel sorry for people who don’t know anything about chemistry. They are missing an important source of happiness....’ - Linus Pauling 1901-1994 S.A. Matlin, G. Mehta, H. Hopf. Chemistry Embraced by All. Science 2015, 347, 1179 Chemistry is in everything. and everything is in it, it is the basis of life, without it we wouldn't exist. Green tea has ~ 200 chemicals Coffee has ~ 1000 chemicals Wine has >1000 chemicals Light cigarette ~ 4000 chemicals Chemistry is ubiquitous/omnipresent Chemistry – Tracing the roots and to the present BCE Art & craft of mixing substances A giant knowledge leap Alchemy to modern science Evidence based science Discipline in a Table - systematization Mendeleev’s Periodic Law ‘Molecularization’ of chemical matter 20th Century A century of evolutionary march of chemistry 20h Century Value added products from almost anything “Utility science” and everything Molecular understanding of life processes and “Core Science” chemical matter Interdisciplinarity in forefront “Integrative Science” Resource stressed planet “Sustainability Science” 21st Century S. -
The Lock-And-Key Analogy in 20Th Century Biochemistry
From: Rebecca Mertens The Construction of Analogy-Based Research Programs The Lock-and-Key Analogy in 20th Century Biochemistry April 2019, 224 p., pb., ill. 34,99 € (DE), 978-3-8376-4442-5 E-Book: PDF: 34,99 € (DE), ISBN 978-3-8394-4442-9 When the German chemist Emil Fischer presented his lock-and-key hypothesis in 1899, his analogy to describe the molecular relationship between enzymes and substrates quickly gained vast influence and provided future generations of scientists with a tool to investigate the relation between chemical structure and biological specificity. Rebecca Mertens explains the appeal of the lock-and-key analogy by its role in model building and in the construction of long-term, cross-generational research programs. She argues that a crucial feature of these research programs, namely ascertaining the continuity of core ideas and concepts, is provided by a certain way of analogy-based modelling. Rebecca Mertens (PhD), born in 1984, is a postdoctoral researcher in the history and philosophy of science at the University of Bielefeld, Germany. She works on the role of analogies, models and forms of comparison in the history of molecular genetics and is a member of the collaborative research program "Practices of ComparisonÚ Ordering and Changing the World". During her graduate and doctoral studies, she was a visiting scholar at the École Normale Supérieure in Paris and a visiting graduate fellow at the Minnesota Center for Philosophy of Science. For further information: www.transcript-verlag.de/en/978-3-8376-4442-5 © 2019 -
Fischer Carbene Complexes in Organic Synthesis Ke Chen 1/31/2007
Baran Group Meeting Fischer Carbene Complexes in Organic Synthesis Ke Chen 1/31/2007 Ernst Otto Fischer (1918 - ) Other Types of Stabilized Carbenes: German inorganic chemist. Born in Munich Schrock carbene, named after Richard R. Schrock, is nucleophilic on November 10, 1918. Studied at Munich at the carbene carbon atom in an unpaired triplet state. Technical University and spent his career there. Became director of the inorganic Comparision of Fisher Carbene and Schrock carbene: chemistry institute in 1964. In the 1960s, discovered a metal alkylidene and alkylidyne complexes, referred to as Fischer carbenes and Fischer carbynes. Shared the Nobel Prize in Chemistry with Geoffery Wilkinson in 1973, for the pioneering work on the chemistry of organometallic compounds. Schrock carbenes are found with: Representatives: high oxidation states Isolation of first transition-metal carbene complex: CH early transition metals Ti(IV), Ta(V) 2 non pi-acceptor ligands Cp2Ta CH N Me LiMe Me 2 2 non pi-donor substituents CH3 (CO) W CO (CO)5W 5 (CO)5W A.B. Charette J. Am. Chem. Soc. 2001, 123, 11829. OMe O E. O. Fischer, A. Maasbol, Angew. Chem. Int. Ed., 1964, 3, 580. Persistent carbenes, isolated as a crystalline solid by Anthony J. Arduengo in 1991, can exist in the singlet state or the triplet state. Representative Fischer Carbenes: W(CO) Cr(CO) 5 5 Fe(CO)4 Mn(CO)2(MeCp) Co(CO)3SnPh3 Me OMe Ph Ph Ph NEt2 Ph OTiCp2Cl Me OMe Foiled carbenes were defined as "systems where stabilization is Fischer carbenes are found with : obtained by the inception of the facile reaction which is foiled by the impossibility of attaining the final product geometry". -
Biochemistrystanford00kornrich.Pdf
University of California Berkeley Regional Oral History Office University of California The Bancroft Library Berkeley, California Program in the History of the Biosciences and Biotechnology Arthur Kornberg, M.D. BIOCHEMISTRY AT STANFORD, BIOTECHNOLOGY AT DNAX With an Introduction by Joshua Lederberg Interviews Conducted by Sally Smith Hughes, Ph.D. in 1997 Copyright 1998 by The Regents of the University of California Since 1954 the Regional Oral History Office has been interviewing leading participants in or well-placed witnesses to major events in the development of Northern California, the West, and the Nation. Oral history is a method of collecting historical information through tape-recorded interviews between a narrator with firsthand knowledge of historically significant events and a well- informed interviewer, with the goal of preserving substantive additions to the historical record. The tape recording is transcribed, lightly edited for continuity and clarity, and reviewed by the interviewee. The corrected manuscript is indexed, bound with photographs and illustrative materials, and placed in The Bancroft Library at the University of California, Berkeley, and in other research collections for scholarly use. Because it is primary material, oral history is not intended to present the final, verified, or complete narrative of events. It is a spoken account, offered by the interviewee in response to questioning, and as such it is reflective, partisan, deeply involved, and irreplaceable. ************************************ All uses of this manuscript are covered by a legal agreement between The Regents of the University of California and Arthur Kornberg, M.D., dated June 18, 1997. The manuscript is thereby made available for research purposes. All literary rights in the manuscript, including the right to publish, are reserved to The Bancroft Library of the University of California, Berkeley. -
Famous Physicists Himansu Sekhar Fatesingh
Fun Quiz FAMOUS PHYSICISTS HIMANSU SEKHAR FATESINGH 1. The first woman to 6. He first succeeded in receive the Nobel Prize in producing the nuclear physics was chain reaction. a. Maria G. Mayer a. Otto Hahn b. Irene Curie b. Fritz Strassmann c. Marie Curie c. Robert Oppenheimer d. Lise Meitner d. Enrico Fermi 2. Who first suggested electron 7. The credit for discovering shells around the nucleus? electron microscope is often a. Ernest Rutherford attributed to b. Neils Bohr a. H. Germer c. Erwin Schrödinger b. Ernst Ruska d. Wolfgang Pauli c. George P. Thomson d. Clinton J. Davisson 8. The wave theory of light was 3. He first measured negative first proposed by charge on an electron. a. Christiaan Huygens a. J. J. Thomson b. Isaac Newton b. Clinton Davisson c. Hermann Helmholtz c. Louis de Broglie d. Augustin Fresnel d. Robert A. Millikan 9. He was the first scientist 4. The existence of quarks was to find proof of Einstein’s first suggested by theory of relativity a. Max Planck a. Edwin Hubble b. Sheldon Glasgow b. George Gamow c. Murray Gell-Mann c. S. Chandrasekhar d. Albert Einstein d. Arthur Eddington 10. The credit for development of the cyclotron 5. The phenomenon of goes to: superconductivity was a. Carl Anderson b. Donald Glaser discovered by c. Ernest O. Lawrence d. Charles Wilson a. Heike Kamerlingh Onnes b. Alex Muller c. Brian D. Josephson 11. Who first proposed the use of absolute scale d. John Bardeen of Temperature? a. Anders Celsius b. Lord Kelvin c. Rudolf Clausius d. -
The Nobel Prize Sweden.Se
Facts about Sweden: The Nobel Prize sweden.se The Nobel Prize – the award that captures the world’s attention The Nobel Prize is considered the most prestigious award in the world. Prize- winning discoveries include X-rays, radioactivity and penicillin. Peace Laureates include Nelson Mandela and the 14th Dalai Lama. Nobel Laureates in Literature, including Gabriel García Márquez and Doris Lessing, have thrilled readers with works such as 'One Hundred Years of Solitude' and 'The Grass is Singing'. Every year in early October, the world turns Nobel Day is 10 December. For the prize its gaze towards Sweden and Norway as the winners, it is the crowning point of a week Nobel Laureates are announced in Stockholm of speeches, conferences and receptions. and Oslo. Millions of people visit the website At the Nobel Prize Award Ceremony in of the Nobel Foundation during this time. Stockholm on that day, the Laureates in The Nobel Prize has been awarded to Physics, Chemistry, Physiology or Medicine, people and organisations every year since and Literature receive a medal from the 1901 (with a few exceptions such as during King of Sweden, as well as a diploma and The Nobel Banquet is World War II) for achievements in physics, a cash award. The ceremony is followed a magnificent party held chemistry, physiology or medicine, literature by a gala banquet. The Nobel Peace Prize at Stockholm City Hall. and peace. is awarded in Oslo the same day. Photo: Henrik Montgomery/TT Henrik Photo: Facts about Sweden: The Nobel Prize sweden.se Prize in Economic Sciences prize ceremonies. -
The Franck-Hertz Experiment: 100 Years Ago and Now
The Franck-Hertz experiment: 100 years ago and now A tribute to two great German scientists Zoltán Donkó1, Péter Magyar2, Ihor Korolov1 1 Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Budapest, Hungary 2 Physics Faculty, Roland Eötvös University, Budapest, Hungary Franck-Hertz experiment anno (~1914) The Nobel Prize in Physics 1925 was awarded jointly to James Franck and Gustav Ludwig Hertz "for their discovery of the laws governing the impact of an electron upon an atom" Anode current Primary experimental result 4.9 V nobelprize.org Elv: ! # " Accelerating voltage ! " Verh. Dtsch. Phys. Ges. 16: 457–467 (1914). Franck-Hertz experiment anno (~1914) The Nobel Prize in Physics 1925 was awarded jointly to James Franck and Gustav Ludwig Hertz "for their discovery of the laws governing the impact of an electron upon an atom" nobelprize.org Verh. Dtsch. Phys. Ges. 16: 457–467 (1914). Franck-Hertz experiment anno (~1914) “The electrons in Hg vapor experience only elastic collisions up to a critical velocity” “We show a method using which the critical velocity (i.e. the accelerating voltage) can be determined to an accuracy of 0.1 V; its value is 4.9 V.” “We show that the energy of the ray with 4.9 V corresponds to the energy quantum of the resonance transition of Hg (λ = 253.6 nm)” ((( “Part of the energy goes into excitation and part goes into ionization” ))) Important experimental evidence for the quantized nature of the atomic energy levels. The Franck-Hertz experiment: 100 years ago and now Franck-Hertz experiment: published in 1914, Nobel prize in 1925 Why is it interesting today as well? “Simple” explanation (“The electrons ....”) → description based on kinetic theory (Robson, Sigeneger, ...) Modern experiments Various gases (Hg, He, Ne, Ar) Modern experiment + kinetic description (develop an experiment that can be modeled accurately ...) → P. -
Tomaso A. Poggio
BK-SFN-NEUROSCIENCE-131211-09_Poggio.indd 362 16/04/14 5:25 PM Tomaso A. Poggio BORN: Genova, Italy September 11, 1947 EDUCATION: University of Genoa, PhD in Physics, Summa cum laude (1971) APPOINTMENTS: Wissenschaftlicher Assistant, Max Planck Institut für Biologische Kybernetik, Tubingen, Germany (1978) Associate Professor (with tenure), Department of Psychology and Artificial Intelligence Laboratory, Massachusetts Institute of Technology (1981) Uncas and Helen Whitaker Chair, Department of Brain & Cognitive Sciences, Massachusetts Institute of Technology (1988) Eugene McDermott Professor, Department of Brain and Cognitive Sciences, Computer Science and Artificial Intelligence Laboratory and McGovern Institute for Brain Research, Massachusetts Institute of Technology (2002) HONORS AND AWARDS (SELECTED): Otto-Hahn-Medaille of the Max Planck Society (1979) Member, Neurosciences Research Program (1979) Columbus Prize of the Istituto Internazionale delle Comunicazioni Genoa, Italy (1982) Corporate Fellow, Thinking Machines Corporation (1984) Founding Fellow, American Association of Artificial Intelligence (1990) Fellow, American Academy of Arts and Sciences (1997) Foreign Member, Istituto Lombardo dell’Accademia di Scienze e Lettere (1998) Laurea Honoris Causa in Ingegneria Informatica, Bicentenario dell’Invezione della Pila, Pavia, Italia, March (2000) Gabor Award, International Neural Network Society (2003) Okawa Prize (2009) Fellow, American Association for the Advancement of Science (2009) Tomaso Poggio began his career in collaboration -
Ernest Rutherford and the Accelerator: “A Million Volts in a Soapbox”
Ernest Rutherford and the Accelerator: “A Million Volts in a Soapbox” AAPT 2011 Winter Meeting Jacksonville, FL January 10, 2011 H. Frederick Dylla American Institute of Physics Steven T. Corneliussen Jefferson Lab Outline • Rutherford's call for inventing accelerators ("million volts in a soap box") • Newton, Franklin and Jefferson: Notable prefiguring of Rutherford's call • Rutherfords's discovery: The atomic nucleus and a new experimental method (scattering) • A century of particle accelerators AAPT Winter Meeting January 10, 2011 Rutherford’s call for inventing accelerators 1911 – Rutherford discovered the atom’s nucleus • Revolutionized study of the submicroscopic realm • Established method of making inferences from particle scattering 1927 – Anniversary Address of the President of the Royal Society • Expressed a long-standing “ambition to have available for study a copious supply of atoms and electrons which have an individual energy far transcending that of the alpha and beta particles” available from natural sources so as to “open up an extraordinarily interesting field of investigation.” AAPT Winter Meeting January 10, 2011 Rutherford’s wish: “A million volts in a soapbox” Spurred the invention of the particle accelerator, leading to: • Rich fundamental understanding of matter • Rich understanding of astrophysical phenomena • Extraordinary range of particle-accelerator technologies and applications AAPT Winter Meeting January 10, 2011 From Newton, Jefferson & Franklin to Rutherford’s call for inventing accelerators Isaac Newton, 1717, foreseeing something like quarks and the nuclear strong force: “There are agents in Nature able to make the particles of bodies stick together by very strong attractions. And it is the business of Experimental Philosophy to find them out. -
The History of Biochemistry
ISSN 2409-4943. Ukr. Biochem. J., 2019, Vol. 91, N 1 THES HHISI TORY OF BBIOCHEMISIOCHEMISTRY УДК 577.12 + 577.23 doi: https://doi.org/10.15407/ubj91.01.108 Внесок лауреатіВ нобеліВської премії В розВиток динамічної біохімії та біоенергетики. е. бухнер, а. коссель, р. Вільштеттер, о. мейєргоф, а. хілл, о. Варбург, а. сент-дьєрді В. М. ДанилоВа, Р. П. ВиногРаДоВа, С. В. КоМіСаРенКо і нститут біохімії ім. о. В. Палладіна НАН України, Київ; e-mail: [email protected] отримано: 29 листопада 2018; затверджено: 13 грудня 2018 Дякуючи геніальним відкриттям нобелівських лауреатів першої половини ХХ ст. – е. Бухнера, а. Косселя, Р. Вільштеттера, о. Мейєргофа, а. Хілла, о. Варбурга, а. Сент-Дьєрді, сьогодні ми маємо уявлення про механізм перетворення і окислення органічних речовин в живих організмах. В статті представлено аналіз творчої діяльності цих геніїв експерименту і людської думки, які через розшифрування основних шляхів перетворення вуглеводів і енергії в живих організмах заклали основи динамічної біохімії та біоенергетики (одного з розділів біохімічної науки). К л ю ч о в і с л о в а: е. Бухнер, а. Коссель, Р. Вільштеттер, о. Мейєргоф, а. Хілл, о. Варбург, а. Сент- Дьєрді, зимаза, ензими, динамічна біохімія, біоенергетика. априкінці XIX ст. дослідники вже що окислюються. Перетворення органічних зрозуміли, що між початковими і речовин у живих організмах відбувається без Н кінцевими продуктами перетворень підвищення температури і за фізіологічних складних органічних сполук мають утворю- умов завдяки участі в реакціях біологічних ватись проміжні компоненти. Так, протеїни, каталізаторів – ензимів. вуглеводи і жири не відразу утворюють дво- Але це не було відомо наприкінці ХІХ – на окис вуглецю і воду; в процесі їх перетворення початку ХХ ст.