21. The National Archives | Search The Archives | National Register Of Archives | De hartree, douglas Rayner (18971958) Mathematical Physicist. 6 records noted.Scope, corresp and papers. Repository, Cambridge University Christs College http://www.nra.nationalarchives.gov.uk/nra/searches/pidocs.asp?P=P13220

22. Hartree, Douglas R --  Britannica Concise Encyclopedia Online Article hartree, douglas R body English physicist, mathematician, and computer pioneer. http://www.britannica.com/ebc/article?tocId=9366670&query=scheme&ct=

23. World Scientific douglas Rayner hartree His Life in Science and Computing by Charlotte FroeseFischer. Fischer does a good job of outlining the technical context of each of http://www.worldscibooks.com/histsci/reviews.shtml

Home Browse by Subject Bestsellers New Titles ... Browse all Subjects Search Bookshop History of Science New Titles Nobel Lectures Textbooks Recent Reviews ... Book Series Related Links World Scientific Home Imperial College Press Join Our Mailing List Request for related catalogues Recent Reviews History of Science A Journey With Fred Hoyle The Search for Cosmic Life by Chandra Wickramasinghe edited by Kamala Wickramasinghe "A Journey with Fred Hoyle is an intriguing, pacey insight into the working of a fertile scientific mind, and especially one focussed on a topic that is not in the mainstream of astronomical and biological endeavour ... I enjoyed A Journey with Fred Hoyle greatly." The Observatory Magazine History of Mathematical Sciences Portugal and East Asia II Scientific Practices and the Portuguese Expansion in Asia (1498-1759) University of Macau, China 10 - 12 October 1998 "Overall, it is historians of science that will find this book most interesting, particularly those whose research focuses on intercultural issues." MAA Online Book Review Newton'S Darkness Two Dramatic Views "We found the plays to be enjoyable, engrossing, provocative, and thought-provoking, and we heartily recommend them to students and general readers interested in biography and the history of science and of literature as well as theater-goers."

24. Hartree-Fock - Wikipedia, The Free Encyclopedia The procedure is named after douglas hartree, who devised the selfconsistentfield method, and VA Fock, who demonstrated the rigour of hartree s method and http://en.wikipedia.org/wiki/Hartree-Fock_approximation

Wikimedia needs your help in its 21-day fund drive. See our fundraising page Over US$155,000 has been donated since the drive began on 19 August. Thank you for your generosity! Hartree-Fock From Wikipedia, the free encyclopedia. (Redirected from Hartree-Fock approximation In computational physics and computational chemistry , the Hartree-Fock HF ) or self-consistent field SCF ) calculation scheme is a self-consistent iterative variational procedure to calculate the Slater determinant (or the molecular orbitals which it is made of) for which the expectation value of the electronic molecular Hamiltonian is minimum. Whilst it calculates the exchange energy exactly, it does not include the effect of electron correlation . The procedure is named after Douglas Hartree , who devised the self-consistent field method, and V. A. Fock , who demonstrated the rigour of Hartree's method and reformulated it into the matrix form used today. Expressed in a Slater-type or Gaussian-type basis set , the Hartree-Fock equation can be transformed into matrix form called Roothaan equations Contents Hartree-Fock algorithm Mathematical formulation The Fock operator Linear combination of atomic orbitals ... Weaknesses, extensions, and alternatives

25. NAHC/HAR. DOUGLAS R. HARTREE Professor douglas R. hartree (18971958) was one of the most influential A2 douglas R. hartree , Obituary Notices of Fellows of Royal Society, http://www.chstm.man.ac.uk/nahc/contents/har.htm

NAHC/HAR. DOUGLAS R. HARTREE Professor Douglas R. Hartree (1897-1958) was one of the most influential mathematicians and computer pioneers of his day, whose work bridged both the calculating machine and electronic digital eras. As Beyer Professor of Applied Mathematics at Manchester University in the mid 1930s, Hartree built a differential analyzer based upon the machine of the American, Vannevar Bush. Hartree's international reputation ensured that he kept in close touch with American developments, and during the Second World War he became involved with the ENIAC project. On his return to England (where he had accepted a chair at Cambridge University) Hartree publicised American activities and was an enthusiastic supporter of British efforts to build stored program computers. References : M.V. Wilkes' introduction to Hartree, Calculating Machines etc. (Cambridge, Mass.; MIT Press, 1984). A small number of Hartree papers are deposited in the Archives of Churchill College, Cambridge. See listing by Contemporary Scientific Archives Centre (CSAC 45/9/76). Copy in NAHC. The collection comprises one box of archival material.

26. The Mathematics Genealogy Project - Douglas Hartree According to our current online database, douglas hartree has 1 students and 3descendants. We welcome any additional information. http://www.genealogy.math.ndsu.nodak.edu/html/id.phtml?id=60187

27. The Mathematics Genealogy Project - Update Data For Douglas Hartree If you have Mathematics Subject Classifications to submit for an entire group ofindividuals (for instance all those that worked under a particular advisor) http://www.genealogy.math.ndsu.nodak.edu/html/php/submit-update.php?id=60187

28. Cambridge-Cranfield High Performance Computing Facility: Historical Information hartree ran AIX, IBM s UNIX. hartree s queues allowed jobs of up to 12 hours and32 processors (140 Gflops and 64 Gb). Biography of douglas hartree http://www.hpcf.cam.ac.uk/history.html

History Cambridge-Cranfield HPCF History The CCHPCF, formerly the HPCF, began in the early 90's by the efforts of a consortium of scientists from different departments who found themselves unable to obtain sufficient computing resources either locally or nationally. The consortium was successful in obtaining financial support from the University, the Newton Trust, Hitachi and grant applications including bids to JREI. This page gives details of past hpcf machines. Turing Hitachi S3600 Babbage Hitachi SR2201 Hodgkin SGI Origin 2000 Hartree IBM SP There are also some old benchmarks Turing Hitachi S3600 Turing was installed 1996 and decommissioned at the end of February 1999. Turing was a single-processor Hitachi S3600 vector supercomputer. Turing had both a scalar and vector processor. The vector unit could sustain speeds of over 1GFLOP, whereas the scalar unit struggled to get above 10MFLOPS. Code which couldn't be vectorised would thus run faster on a standard departmental workstation. Some simple examples of the effect of vectorisation and vector length are given below: Some Fortran Timings (MFlops) Length + * / SQRT EXP LOG SIN ATAN 1 3 3 2 10 34 33 25 5 5 3 6 4 100 291 287 177 43 16 31 65 36 1,000 715 715 371 63 18 46 111 54 10,000 827 826 379 63 18 46 111 54 100,000 850 849 386 63 18 46 111 54 1,000,000 857 870 389 63 18 46 111 54

29. Hartree Energy - A Whatis.com Definition The value of the hartree energy is approximately 4.36 x 1018 joule (J), The constant gets its name from the 20th-century physicist douglas hartree. http://whatis.techtarget.com/definition/0,,sid9_gci869619,00.html

Search our IT-specific encyclopedia for: or jump to a topic: Choose a topic... CIO CRM Data Center Domino Enterprise Linux Enterprise Voice Exchange IBM S/390 IBM AS/400 Mobile Computing Networking Oracle SAP Security Small Medium Business SQL Server Storage Visual Basic Web Services Windows 2000 Windows Security Windows Systems Advanced Search Browse alphabetically: A B C D ... Computing Fundamentals Hartree energy The Hartree energy is a physical constant equal to twice the binding energy of the electron in the ground state (the lowest-energy state) of the hydrogen atom . When a hydrogen atom is in this state, an amount of energy equal to 0.5 Hartree is necessary to free the electron and thereby cause the atom to become an ion The value of the Hartree energy is approximately 4.36 x 10 joule (J), or 27.2 electronvolts (eV). The constant gets its name from the 20th-century physicist Douglas Hartree. It is sometimes used as an energy unit in theoretical physics. Also see Table of Physical Constants Last updated on: Dec 16, 2002 Webcast: Archiving e-mail How, when and why. Click here.

30. Oxford Physics - Library A2A HAR1, hartree, douglas, Numerical analysis, 300793117. A2A HAR2, (Repr., 1964),hartree, douglas, Numerical analysis, 300793141 http://www.physics.ox.ac.uk/library/list.asp?CID=A02&lib=astro

31. Oxford Physics - Library 02 HAR, hartree, douglas, Numerical analysis, 302224795. 02 HAR, 1 (vol. 1),Harris, Edward G, Introduction to modern t, 300792772. 02 HAR, 2 (vol. http://www.physics.ox.ac.uk/library/list.asp?CID=02&lib=

32. Stephen Wolfram: A New Kind Of Science -- Relevant Books hartree, douglas R. Calculating Instruments and Machines University of Illinois,1949. hartree, douglas R. Numerical Analysis http://www.wolframscience.com/reference/books/h.html

WOLFRAM'S LIBRARY A B C D ... G H I J K L ... W X Y Z H Haas, Arthur Commentary on the Scientific Writings of J. Willard Gibbs Volume 2: Theoretical Physics Yale University Press, 1936 Hacking, Ian A Concise Introduction to Logic Random House, 1972 Hacking, Ron Quasiclassical Renormalization Hadamard, Jacques The Psychology of Invention in the Mathematical Field Dover Publications, Inc., 1954 Haeckel, Ernst Heinrich Philipp August Art Forms in Nature Dover Publications, Inc., 1974. [ISBN 0486229874 Hagedorn, R. Relativistic Kinematics: A Guide to the Kinematic Problems of High-Energy Physics. W.A. Benjamin, 1973. [ISBN 0805336001 Hahn, Otto Otto Hahn: My Life, the Autobiography of a Scientist Herder and Herder, 1970. [ISBN 0356029336 Hahne, F.J.W. Lecture Notes In Physics Critical Phenomena Springer-Verlag, 1983. Hahne, F.J.W., Editor Critical Phenomena. Proceedings, Stellenbosch, South Africa 1982 Springer-Verlag, 1983. [ISBN 0387126759 Haken, H. Editor Chaos and Order in Nature. Proceedings of the International Symposium on Synergetics. (Schloss Elmau, Bavaria, April 27-May 2, 1981) Springer-Verlag, 1981. [ISBN 0387111018

33. Doug Coward's Analog Computer Museum Calculating Instruments and Machines hartree,douglas R. Cambridge at the 1950 Lectures given by douglas hartree at the University of Illinois in 1948 on http://dcoward.best.vwh.net/analog/readlist.htm

Radio Electronics January 1959 "Computers Speed Aircraft Design" featuring the Heath Analog Computer. Analog computer are used to simulate real world systems. Aircraft design was one of the early wide spread uses. During the 40's, 50's and 60's electronic analog computers were used to simulate the characteristics of a new aircraft, missle, or rocket designs. Because of their true parallel computing nature, speed, small size, and ease of programming, they beat digitial computers hands down in these kinds of tasks. In the mid 60's a new class of computer took over these jobs, the hybrid (combination analog / digital) computer. Suggested reading about analog computers This is the best book I have seen for someone new to analog computers Basics of Analog Computers Truitt,T.D. and Rogers,A.E. John F. Rider Publisher Inc. 1960 Other books about analog computers in our library A Palimpsest on the Electronic Analog Art Paynter,H.M. George A. Philbrick Researches,Inc. 1955 "Collection of reprints of papers and other writings" about analog computers from the early 1950's. Abacs or Nomograms Giet,A Philosophical Library Inc. 1956

34. Douglas Hartree - The MIT Press The MIT Press online catalog contains descriptions of inprint and out-of-printbooks, current and past journals, online ordering/subscription options, http://mitpress.mit.edu/catalog/author/default.asp?aid=2511

35. Calculating Machines - The MIT Press douglas hartree Introduction by Maurice V. Wilkes A theoretical physicist atCambridge, douglas hartree is best known for his work in numerical methods and http://mitpress.mit.edu/catalog/item/default.asp?ttype=2&tid=5403

36. Biography Of Hartree, Douglas Rayner Biographies of people living and dead of all nations. http://www.allbiographies.com/biography-DouglasRaynerHartree-14878.html

search biography names match all words match any words use wildcards browse biographies get a new biography browse by name browse by year online dictionary allmath.com math for students travel deals hotel rooms biography classifications major works cross references biography name: Hartree, Douglas Rayner sex: male lived: biography: browse by name A B C D ... Z browse by year 2700 - 691 BC 690 - 531 BC 530 - 481 BC 480 - 391 BC ... Allsites LLC

37. Guide H hartree, douglas Rayner (18971958), mathematician Title Papers andcorrespondence of douglas Rayner hartree, 1897-1958 http://www.bath.ac.uk/ncuacs/guideh.htm

NCUACS homepage Guide List of Contents Guide to the manuscript papers of British scientists: H ACCESS ARRANGEMENTS The collections described in this guide have been catalogued by the Unit and subsequently deposited in libraries and archives throughout the UK. Inclusion in this guide does not imply that collections will be completely available for research. There are restrictions on access to items in a number of the collections and researchers should always consult the appropriate repository before planning a visit. New Most of the catalogues compiled by the Unit can now be viewed online through the Access to Archives website at the National Archives ( http://www.a2a.org.uk Direct links to the catalogues are being (gradually) added from this Guide To view the full-text catalogue, please click on the link under Finding Aid Note, some catalogues are very extensive and may take a few moments to download. An indication of the size of the file is provided. HANSON , Emmeline Jean (1919-1973), biophysicist HARDY , Sir Alister Clavering (1896-1985). Knight, zoologist

38. NCUACS Homepage hartree, douglas Rayner (18971958), mathematician. CSAC no. 45/9/76, 4pp.Christ s College, Cambridge. RENWICK, William (1924-1971) CSAC no. 84/2/82, 9pp. http://www.bath.ac.uk/ncuacs/catlist3.htm

NCUACS homepage List of CSAC and NCUACS catalogues: arranged by discipline The list gives the scientist's name and dates and discipline, followed by the catalogue number and number of pages, and the place of deposit. Some scientists and engineers, winning acclaim or associated with interests in more than one field, may appear under more than one heading. Copies of NCUACS catalogues may be purchased from the Unit, and terms are available on request from ncuacs@bath.ac.uk BIOCHEMISTRY, BIOPHYSICS AND MOLECULAR BIOLOGY CHEMISTRY (includes crystallography) COMPUTER SCIENCE EARTH SCIENCES (includes geology, geophysics, meteorology) ENGINEERING AND RELATED GENETICS MATERIAL SCIENCES MATHEMATICS ... ZOOLOGY AND NATURAL HISTORY (includes entomology, ethology, animal ecology, ornithology and related areas) OTHER Last updated 8 June 2005. T.E.Powell@bath.ac.uk Alphabetical Guide to CSAC and NCUACS catalogues Summary list of CSAC and NCUACS catalogues: alphabetical List of CSAC and NCUACS catalogues: chronological List of CSAC and NCUACS catalogues: by repository BIOCHEMISTRY, BIOPHYSICS AND MOLECULAR BIOLOGY

39. Hartree-Fock -- Facts, Info, And Encyclopedia Article The name is for (Click link for more info and facts about douglas hartree) douglashartree, who devised the self consistent field method, and (Click link http://www.absoluteastronomy.com/encyclopedia/h/ha/hartree-fock1.htm

Hartree-Fock [Categories: Computational physics] In (Click link for more info and facts about computational physics) computational physics , the Hartree-Fock calculation scheme is a self-consistent (Click link for more info and facts about iterative) iterative procedure to calculate the so-called "best possible" single determinant solution to the time-independent (Click link for more info and facts about Schrödinger equation) Schrödinger equation of a many-electron system in a (Click link for more info and facts about Coulombic) Coulombic potential of fixed nuclei. As a consequence to this, whilst it calculates the exchange energy exactly, it does not calculate the effect of electron correlation at all. Because the nuclei are modeled as fixed point charges, it is only applicable after the (Click link for more info and facts about Born-Oppenheimer approximation) Born-Oppenheimer approximation has been made. The name is for (Click link for more info and facts about Douglas Hartree) Douglas Hartree , who devised the self consistent field method, and (Click link for more info and facts about V. A. Fock)

40. Hartree Energy -- Facts, Info, And Encyclopedia Article named after (A scientist trained in physics) physicist (Click link for moreinfo and facts about douglas hartree) douglas hartree. http://www.absoluteastronomy.com/encyclopedia/h/ha/hartree_energy.htm

Hartree energy [Categories: Constants, Units of energy] The Hartree energy (symbol E h ) is a (Click link for more info and facts about physical constant) physical constant used as (Click link for more info and facts about atomic unit) atomic unit of energy, named after (A scientist trained in physics) physicist (Click link for more info and facts about Douglas Hartree) Douglas Hartree It has a value of twice the (A numerical value regardless of its sign) absolute value of (The energy required to separate particles from a molecule or atom or nucleus; equals the mass defect) binding energy of the (An elementary particle with negative charge) electron in the ((physics) the lowest energy state of an atom or other particle) ground state of the (A nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe) hydrogen ((physics and chemistry) the smallest component of an element having the chemical properties of the element) atom W (Click link for more info and facts about ionization energy) ionization energy (The 10th letter of the Roman alphabet) J (A unit of energy equal to the work done by an electron accelerated through a potential difference of 1 volt) eV (Click link for more info and facts about Ry) Ry (Click link for more info and facts about kcal/mol) kcal/mol where: is the (Click link for more info and facts about Planck's constant) Planck's constant is the (An elementary particle with negative charge)

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