Leon Hove (22 results)

Condition: New.

Condition: New. Problems In Quantum Theory Of Many Particle Systems (Paperback or Softback).

Condition: As New. Unread book in perfect condition.

Condition: New.

Condition: New.

Hardback or Cased Book. Condition: New. Problems in Quantum Theory of Many Particle Systems. Book.

Condition: As New. Unread book in perfect condition.

Condition: New.

Condition: As New. Unread book in perfect condition.

Condition: New.

Condition: As New. Unread book in perfect condition.

Condition: New.

broché Couverture Illustrée. Condition: Très Bon État. 102 pages en format 16.5 - 25 cm - papier non coupé - tome XXVI - fascicule 6 - +++++++++++++++++++++TBE++++++++++++++++++++++.

Broché. Condition: Très Bon État. Académie royale de Belgique - classe des sciences - mémoires - 68 pages en format 17 - 25 cm - papier non coupé ++++++++++TBE++++++++++++.

Condition: Sehr gut. Zustand: Sehr gut | Seiten: 262 | Sprache: Englisch | Produktart: Bücher | Keine Beschreibung verfügbar.

Condition: Hervorragend. Zustand: Hervorragend | Seiten: 262 | Sprache: Englisch | Produktart: Bücher | Keine Beschreibung verfügbar.

Hardcover. Condition: Very Good. First Edition, First Printing. 210 Pp. Later Binding Of Blue Cloth With Title On Spine. Includes Front Wrapper Of Issue #1 And Rear Wrapper Of An Undetermined Issue, Other Wrappers Missing, But Contents Complete And All Pages Present [Including Contents Pages To Only Two Numbers]. Institutional Stamp On Front Endpaper And Title Page, No Other Names Or Marks.…

orig.wrappers. Condition: Unopened. Minor rubbing. VG. 23x15cm, 102 pp., Series: Académie Royale de Belgique. Classe des Sciences. Mémoires, collection in-8°, t. XXVI, fasc. 6.

Condition: Good. Pp. 65-80, Unbound Sheets with text & prints of wood engravings, Very Good.

1st Edition. FIRST EDITION IN ORIGINAL WRAPS OF VAN HOVE'S PAPER PRESENTING A CENTRAL QUANTITY IN THE STUDY OF FLUCTUATIONS, THE DENSITY-DENSITY SPACETIME CORRELATION THAT HAS COME TO BE KNOWN AS THE VAN HOVE FUNCTION. Here Van Hove offers "a natural time-dependent generalization for the well-known pair distribution function g(r) of systems of interacting particles. The pair distribution in space and time thus defined, denoted by G(r,t), gives rise to a very simple and entirely general expression for the angular and energy distribution of [the] Born approximation scattering by the system" (Van Hove). Van Hove's paper is considered seminal. Another way of stating this is to say that the Van Hove formula proveides the relation between the cross-sections "for scattiner of slow neutrons by an assembly of nuclei and space-time correlation functions for hte motion of the scattering system. [His papers shows that] the Born approximation scattering cross section can be expressed in terms of the four-dimensional Fourier transform of a pair distribution function depending on a space vector and a time variable. The formula. provided a convenient method of analyzing the properties of slow neutron scattering by systems of particles, of light scattering by media, etc. The advantage of using [it] for analysis of scattering data is its compact form and intuitively clear physical meaning" (Berne, B. J. Time Dependent Properties of Condensed Media). ALSO PRESENT, Charles Townes' Nobel Prize winning construction of the first amplification and generation of electromagnetic waves by stimulation - the first ammonia maser. Townes coined the word 'maser' for this device, an acronym for microwave amplification by stimulated emission of radiation. CONDITION & DETAILS: Lancaster: American Physical Society. Quarto (11.25 x 8.25 inches; 275 x 200mm). Original wraps. Ex-libris bearing a light "Duplicate Reserve Collection" stamp on the front wrap and two equally light small date stamps on the rear wrap. Minor wear at the spine, repaired to match. Slight scuffing and wear around the edges. Otherwise bright and very clean throughout.…

1st Edition. FIRST EDITION IN ORIGINAL PAPER WRAPS OF THE NOBEL PRIZE WINNING CONSTRUCTION OF THE FIRST AMPLIFICATION AND GENERATION OF ELECTROMAGNETIC WAVES BY STIMULATED EMISSION -- THE FIRST AMMONIA MASER. Townes coined the word 'maser' for this device, an acronym for microwave amplification by stimulated emission of radiation. The device they built "used stimulated emission in a stream of energized ammonia molecules to produce amplification of microwaves at a frequency of about 24.0 gighertz" (Wikipedia). "Einstein suggested 'that under the proper circumstances, atoms could release excess energy as light -- either spontaneously or when stimulated by light. In 1951, Charles H. Townes, then at Columbia University in New York City, thought of a way to generate stimulated emission at microwave frequencies. "In the 1930s scientists could have built a laser. They had the optical techniques and theoretical knowledge -- but nothing pushed these together. Charles Townes od Columbia University had studies molecules as a physicist in the 1930s, and during the war he had worked on radar as an electronics engineer. The Office of Naval Research pressed him and other physicists to put their heads together and invent a way to make powerful beams of radiation at ever shorter wavelengths. In 1951 he found a solution. Under the right conditions -- say, inside a resonating cavity like the ones used to generate radar waves --- the right kind of collection of molecules might generate radiation all on its own. He was applying an engineer's insights to a physicists's atomic systems. Townes gave the problem to Herbert Zeiger, a postdoctoral student, and James P. Gordon, a graduate student. By 1954 they had the device working [this paper being the detailed description of what they built]. Townes called it a MASER, for "Microwave Amplification by Stimulated Emission of Radiation" (AIP, Laserfest). Townes was awarded the Nobel Prize in Physics for this work in 1964. ALSO INCLUDED is Van Hove's paper presenting a central quantity in the study of fluctuations, the density-density spacetime correlation that has come to be known as the Van Hove function. CONDITION & DETAILS: Lancaster: American Physical Society. Quarto (11.25 x 8.25 inches; 275 x 200mm). Original wraps. Ex-libris bearing a light "Duplicate Reserve Collection" stamp on the front wrap and two equally light small date stamps on the rear wrap. Minor wear at the spine, repaired to match. Slight scuffing and wear around the edges. Otherwise bright and very clean throughout.…

Paperback / softback. Condition: New. This item is printed on demand. New copy - Usually dispatched within 5-9 working days.