Mccrea william hunter (12 resultados)

Hardcover. Condición: Very Good. No Jacket. Hardcover 1969 edition. Ex-library book with stamps and labels attached. Binding firm. Pages unmarked and clean. Covers and text in very good condition. Minor wear to corners. Series: Sigma Series of Science Surveys. [18 l. 26 cm].

First Edition. Very good cloth library copy in a very good if slightly edge-nicked and dust-toned dust-wrapper, now mylar-sleeved. Light foxing to edges and prelims; some library marks remain. A well-preserved example overall; internally strong and clean. Physical description; 199 pages, 5 pages of plates ; 31 cm. Notes; Includes bibliographical references. Subjects; Cosmic dust Congresses 20th century. Interstellar matter Congresses 20th century. Halley's comet Congresses 20th century. Solar system 20th century. 1 Kg.…

First Edition. Very good cloth library copy in a very good if slightly edge-nicked and dust-toned dust-wrapper, now mylar-sleeved. Light foxing to edges and prelims; some library marks remain. A well-preserved example overall; internally strong and clean. Physical description; 199 pages, 5 pages of plates ; 31 cm. Notes; Includes bibliographical references. Subjects; Cosmic dust Congresses 20th century. Interstellar matter Congresses 20th century. Halley's comet Congresses 20th century. Solar system 20th century. 1 Kg.…

Hardcover. Condición: Good. No Jacket. 1st Edition. This is an ex library copy with associated bookplates, stamps and marks. Boards are bowed, and wrapped in a protective plastic. Boards rubbed and lightly marked. Clean throughout. Good. Book.

Paperback. Condición: Good. 1st Edition. 80 pages, illustrated, bibliographical notes, spine sunned, repair to front hinge, press cuttings and a postcard loosely inserted.

Condición: Very Good. 1958. Hardcover. 7pp, 27 cm, Pamphlet. January 1958. Nice copy. Slight dustwear to covers. Reprinted from Endeavour, Volume XVII, Number 65, pp. 5-11. Keywords: "Cosmology. , Pamphlet". Not a first edition copy. . . . Books ship from the US and Ireland.

Condición: Very Good. 1958. Hardcover. 7pp, 27 cm, Pamphlet. January 1958. Nice copy. Slight dustwear to covers. Reprinted from Endeavour, Volume XVII, Number 65, pp. 5-11. Keywords: "Cosmology. , Pamphlet". Not a first edition copy. . . .

Condición: Poor. A lot of dirty marks, a few small tears, scuffs and wear on jacket. Also some wear on cover and signatures on first and last few pages and on inside of back cover. Foxing on first and last few pages and on outer edges of pages. Content is fine to read.

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

Soft cover. Condición: Very Good. **The Horizon Problem in Cosmology** McCrea, Sir William Hunter. "Cosmology After Half a Century: Fifty Years After Einstein's Paper of 1917, Cosmology is in a Supremely Interesting State in Science" found in "Science", 1968, Volume 160, Number 3834, 21 June 1968, pp. 1295-1299 in the issue of pp 1273-1388, Original wrappers. Published by the American Association for the Advancement of Science. Two old stickers on the wrappers: one small sticker at the bottom of the front wrapper and another at the top of the rear wrapper. VG copy. McCrea identified that one of the most pressing issues in modern cosmology was the "horizon problem", identified here clearly for the first time. "Alpher et al. (1950) contains the earliest remarks (in passing) that we are aware of about this particle horizon problem. The terminology is due to Rindler (1956) which is an early discussion of horizons in general. Harrison also mentions the particle horizon problem in passing, but McCrea (1968 [the paper offered here]) and Misner (1969) contain the first clear statements we are aware of."--"The Beginning and Evolution of the Universe", by Bharat Ratra1 and Michael S. Vogeley, June 2007. [++]  ".McCrea.pursue(d) the steady-state theory rather than orthodox relativistic expanding theories. It would not be unfair to characterize these reasons as "philosophical." From the very beginning of his work in the field, McCrea had sought to confront cosmological theory with observation, in part simply to restrain excursions of theorists' imaginations, and in part to provide evidence for choosing between competing models. As the 1930s became 1940s, it became evident to him and other workers that observational tests for cosmological theory were not thick on the ground. While McCrea put aside his research during the war, he did not stop thinking about this central problem. When the Bondi-Gold theory came along, it offered distinct advantages over relativistic expanding universe theory in this regard. As McCrea would later note, "The simple steady-state model was unique. On conceptual grounds this was a high recommendation. On observational grounds, it rendered the model as vulnerable as possible to observational test" (McCrea 1968, p. 1296 [the paper I am offering here]). Bondi and Gold had argued that their theory predicted several specific observationsH-He ratios, galactic density counts, etc.which, if they failed, would contradict the theory. McCrea liked both the specificity of the predictions, and their logic. As he argued, correctly, predictions that are verified can only provide support for a theory, they cannot verify the theory itself. Contradictions, by contrast, rule out a theory tout court. Bondi, following Karl Popper, emphasized that steady-state was more scientific than relativistic expanding universe theory because it was specifically and directly falsifiable. McCrea appreciated this point about steady-state theory."--Complete Dictionary of Scientific Biography online. …

1st Edition. HANDSOME FIRST EDITION OF MCCREA'S "PROTOPLANET THEORY" OF THE CREATION OF THE SOLAR SYSTEM in which the Sun and planets individually coalesced from matter within the same cloud, with the smaller planets later captured by the Sun's larger gravity. After the 1687 publication of Newton's Principia, the heliocentric nature of the solar system with its major components - the Sun, planets and satellites - was so firmly established that it became possible to apply scientific principles to the problem of the solar system's origin. "Most theories that have been advanced in the last 300 years are obviously untenable, but some contain the germs of what might be part of a viable theory" (Oxford Journal of Science & Mathematics, Volume 41, Issue 1, pp. 1.12). William McCrea's protoplanet theory is one of a very small group of theories "that have a reasonable scientific basis" (ibid). In this paper, McCrea presents his theory linking planetary formation with the production of a stellar cluster and also explained the slow rotation of the Sun. "McCrea's starting point was a cloud of gas and dust that was to form a galactic cluster. Due to turbulence, gas streams collided and produced regions of higher-than-average density. The high-density regions, referred to as "floccules", moved through the cloud and combined whenever they collided. When a large aggregation formed, it attracted other floccules in its region so producing a protostar. Since floccules joined the accreting protostar from random directions, the net angular momentum of the protostar was small; for a particular set of parameters it would be only a few times the present angular momentum of the Sun and the excess can be removed after formation by various physical processes. "It was assumed that star-forming regions were isolated and McCrea showed that the angular momentum contained in a region due to the original floccules was much greater than that residing in the protostar. The missing angular momentum was assumed to be taken by smaller aggregations of floccules that were captured by the protostar to form a set of planets"(ibid). McCrea presented papers on the protoplanet theory in 1960, 1963, and 1978 - the first paper, this paper, being the most important. While the theory retains a number of problems, further investigation (Melita and Woolfson, 1996), have shown it to be implausible but not impossible. "It has some good features but there are a number of important assumptions that cannot be justified in the present state of knowledge. Some of these assumptions, for example relating to the way that angular momentum appears in the final star cluster, are amenable to investigation by numberical modeling. On the other hand, the assumption relating to the formation of proto-planet blobs has implicitly been investigated by Woolfson (1979) and this indicates that stars are formed earlier and otherwise in the development of the star-forming cloud. Some answers to this and other criticisms would be necessary to promote the proto-planet theory to the status of plausibility" (Woolfson, The Origin and Evolution of the Solar System, 375-376). CONDITION & DETAILS: London: The Royal Society. Complete volume. 4to. 9.75 by 7 inches (213 x 138mm). [8], 588, [4]. Ex-libris bearing no marks whatsoever on the spine or endpapers; small number stamped at the foot of the contents page and lightly penciled library note on the rear of the title page. The volume is illustrated throughout with in-text figures and 4 plates. Handsomely rebound; gilt lettered at the spine. The marbled paper boards were purposefully scuffed by the binder in order that the book, though rebound, appears somewhat aged. Solidly and very tightly bound. Bright and clean throughout. Fine condition.…

Paperback. Condición: new. Paperback. Written by a distinguished mathematician and educator, this brief but rigorous text is geared toward advanced undergraduates and graduate students. It covers the coordinate system, planes and lines, spheres, homogeneous coordinates, general equations of the second degree, quadric in Cartesian coordinates, and intersection of quadrics. 1947 edition. Written by a distinguished mathematician and educator, this brief but rigorous text is geared toward advanced undergraduates and graduate students. It covers the coordinate system, planes and lines, spheres, homogeneous coordinates, general equations of the second degree, quadric in Cartesian coordinates, and intersection of quadrics. 1947 edition. This item is printed on demand. Shipping may be from our Sydney, NSW warehouse or from our UK or US warehouse, depending on stock availability.…