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Hartree Douglas:     more books (23)

CALCULATING INSTRUMENTS AND MACHINES. by Douglas Rayner Hartree, 1949-01-01 The calculation of atomic structures: Based on lectures given under the auspices of the William Pyle Philips Fund of Haverford College,1955 (Structure of matter series) by Douglas Rayner Hartree, 1957 Calcultaing Instruments and Machines by Douglas R. Hartree, 1953-01-01 Differential analyser (Permanent records of research and development) by Douglas R Hartree, 1949 The calculation of atomic structures (Structure of matter series) by Douglas R Hartree, 1957 Calculating instrumens and machines by Douglas R Hartree, 1950 Introduction to programming for the EDSAC: A supplement to "The preparation of programs for an electronic digital computer" by Wilkes, Wheeler and Gill by Douglas R Hartree, 1955 Calculating Instruments and Machines by Douglas Hartree, 1984

lists with details

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

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
    
    Extractions: Over US$155,000 has been donated since the drive began on 19 August. Thank you for your generosity! (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 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
    
    Extractions: 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
    
    Extractions: 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. There are also some old benchmarks 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
    
    Extractions: 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: 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

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

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
    
    Extractions: 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. Basics of Analog Computers Truitt,T.D. and Rogers,A.E. John F. Rider Publisher Inc. 1960 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.

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

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
    
    Extractions: 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
    
    Extractions: 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

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
    
    Extractions: 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
    
    Extractions: 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

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