摘要:

The report of the Committee this year consists of statements by members covering their work in the field of evaporation and transpiration. In two instances research collaborators have been listed at the suggestion of Committee members.

ISSN:0002-8606    

DOI:10.1029/TR033i001p00119

年代:1952

数据来源: WILEY

摘要:

All of the existing methods for solving flow net are applicable only to two‐dimensional problems. Moreover, they are either limited for further refinement (such as electric analogy, model test in glass flume, and trial‐and‐error method) or impossible for complicated boundary conditions (such as mathematical solution). As a consequence, a relatively new technique, relaxation method, developed by Southwell [1945], has been employed for hydraulic design during the past few years. It is still confined to the problems with two dimensions. The relaxation procedure for two‐dimensional flow net was described by Luthin and Gaskell [1950]and by the writer [Chien

ISSN:0002-8606    

DOI:10.1029/TR033i001p00123

年代:1952

数据来源: WILEY

摘要:

John S. Rinehart (U. S. Naval Ordnance Test Station, Inyokern, China Lake, California)—Prediction of the shape of the crater that will be excavated by an impacting meteorite is a more complex problem than Schriever has indicated. The well‐established meteorite craters are too few in number to provide a sound basis for generalization, particularly in view of the fact that there are scant data regarding the masses, velocities, or angles of impact of the meteorites that formed the craters.During the last few years considerable data that bear on meteorite impacts have been acquired through studies of the impact of high‐velocity missiles [RINEHART, 1950], More recently, the craters produced in rocklike material by 8,000 to 15,000 ft/sec missiles have been studied [RINEHART and WHITE, 1952]. These studies have demonstrated conclusively that the diameter of the meteorite crater can be many times the diameter of the meteorite. A half‐inch diameter steel pellet that strikes a plaster of Paris target at 8,000 ft/sec produces a crater whose diameter is roughly four inches or eight times that of the pellet. The area of the mouth of the crater seems to depend primarily upon the kinetic energy of the missile. A 15,000 ft/sec, 0.6‐gm aluminum pellet and a 8,000 ft/sec, 2‐gm steel pellet, which are equivalent energy‐wise, make about the same

ISSN:0002-8606    

DOI:10.1029/TR033i001p00126

年代:1952

数据来源: WILEY

摘要:

Any technical paper on the phenomena of anchor‐ and frazil‐ice formation is incomplete without a reference to, and discussion of, the research and reports in this field by Altberg, Byden [see Elges, 1940], and Devik [1949], and a reference to the exceptionally complete bibliography on underwater ice prepared by ELGES [1940]. This excellent bibliography contains 91 references to publications on underwater and anchor ice of which 16 are by Altberg and 16 by Bydin. It is probable that the report by ALTBERG [1936]constitutes one of the greatest contributions to be found in the literature on both fundamental and applied research in anchor‐ and frazil‐ice formation.Schaefer has reopened the question of anchor‐ice formation by long‐wave radiation loss from submerged objects. He, at least, implies that BARNES [1906] may have been right in attributing the formation of anchor ice on the stream bed to cooling by long‐wave radiational heat losses through the water. This implication, added to the definite statements by Parsons [1942]and by Linsley and Others [1949, p. 147] that anchor ice occurs only in streams with dark rock bottoms and never on cloudy nights or under bridges, has been thoroughly refuted by Altberg. It is rather astonishing to note that the major works of Barnes and Altberg are cited, side by side, in the refences on page 148 in Meinzer's “Hydrology,” but that credence is given in the text only to Barnes' theory which even at that time (1940)

ISSN:0002-8606    

DOI:10.1029/TR033i001p00127

年代:1952

数据来源: WILEY

摘要:

This is the first portion of a complete revision of a similar work by these authors which first appeared in 1933. The present book bears the sub‐title “Mathematical foundations of geodesy and field operations.” Book H of Volume I, devoted to triangulation computations, will appear, according to the prospectus, in 1952. Volume II entitled 1 “Geodetic astronomy” and Volume III dealing with terrestrial potential fields and figure of the Earth will complete this treatise.The authors state that their aim is to achieve theoretical comprehensiveness together with practical appeal, not seeking, however, to compete with purely theoretical works nor pretending to produce a field manual. This they achieve with typical French clarity and the pedagogical skill acquired in their dual roles of engineering officials in the French government and long‐time professors of geodesy at outstanding techni

ISSN:0002-8606    

DOI:10.1029/TR033i001p00129

年代:1952

数据来源: WILEY

摘要:

A Catalogue of the Active Volcanoes of the World including Solfatara Fields, Part I, covering Indonesia, written by M. Neumann van Padang, has been issued by the Association of Volcanology, IUGG. This is, in fact, more than a “catalogue” as it contains material on form and structure of the volcanoes, volcanic activity and petrography, and has an extensive bibliography. It contains almost 200 pages and lists 128 volcanoes and solfatara fields. A limited edition of 1000 has been published. Inquiries and orders should be sent to Francesco Signore, Secretary of the Association, Via Tasso N. 199, Naples, It

ISSN:0002-8606    

DOI:10.1029/TR033i001p00143

年代:1952

数据来源: WILEY

ISSN:0002-8606    

DOI:10.1029/TR033i001p00147

年代:1952

数据来源: WILEY