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Page 6277, results 156901 - 156925

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Studies of river morphology
Luna Bergere Leopold
1954, Science (119) 326-327
A number of generalizations concerning the behavior and natural characteristics of river channels have been developed by the U.S. Geological Survey in several recently completed studies of river morphology. Measurements of parameters such as the discharge, suspended load, bed material, velocity of flow, channel slope, and channel shape indicate that...
Stability of dilute solutions of uranium, lead, and thorium ions
R.G. Milkey
1954, Analytical Chemistry (26) 1800-1803
Standard solutions and samples containing a few micrograms of metallic ions per milliliter are frequently used in determination of trace elements. It is important to know whether the concentrations of such solutions remain constant from day to day. The stability of dilute solutions of three metallic ions-uranium, lead, and thorium-has...
Composition of the continental plates
J. Gilluly
1954, Tschermaks Mineralogische und Petrographische Mitteilungen (4) 360-369
The structures of continental plates and of oceanic basins suggested by several seismologists are utilized to estimate the relative volumes of sial and sima in the earth's crust. It seems that sial of the composition of the average igneous rock constitutes fully 26% and perhaps as much as 43% of...
Spectrophotometric determination of uric acid and some redeterminations of its solubility
D. R. Norton, M. A. Plunkett, F. A. Richards
1954, Analytical Chemistry (26) 454-457
The present study was initiated in order to develop a rapid and accurate method for the determination of uric acid in fresh, brackish, and sea water. It was found that the spectrophotometric determination of uric acid based upon its reaction with arsenophosphotungstic acid reagent in the presence of cyanide ion...
Double-chamber electrode for spectrochemical determination of chlorine and other halogens
L. H. Azevedo de Paiva, A. W. Specht, R. S. Harner
1954, Spectrochimica Acta (6) 331-333
A double-chamber, graphite electrode, suitable for d.c. arc determination of halogens by means of the alkaline earth halide bands, is described. An upper chamber holds the alkaline earth compound and an interconnected, lower chamber holds the halogen compound.This arrangement assures that there will be an abundance of alkaline earths in...
Fluctuations in production and abundance of commercial species in the Red Lakes, Minnesota, with special reference to changes in the walleye population
Lloyd L. Smith Jr., Laurits W. Krefting
1954, Transactions of the American Fisheries Society (83) 131-160
The Red Lakes in northwestern Minnesota comprise 275,000 acres of water which support a commercial fishery producing up to 1.5 million pounds of fish per year. Walleye, Stizostedion vitreum vitreum (Mitchill), and yellow perch, Perca flavescens (Mitchill), are the principal species. Statistics for the past 37 years have been analyzed...
Relationship of length of fish to incidence of sea lamprey scars on white suckers, Catostomus commersoni, in Lake Huron
A.E. Hall, Oliver R. Elliott
1954, Copeia (1954) 73-74
During the course of experimental fishing operations conducted by the staff of Hammond Bay Fishery Laboratory (a field station of Great Lakes Fishery Investigations) in 1950-1951, length measurements and records of scarring incidence and number of scars per individual were obtained for a sample of 552 white suckers, Catostomus commersoni...
The flood control controversy: Big dams, little dams, and land management
Luna Bergere Leopold, Thomas Maddock Jr.
1954, Book
The purpose of this book is to investigate the facts regarding flood control, a subject that has given rise to extreme controversy in the United States in recent years. The question of flood control is obviously a vital one not only to the United States but to many other countries....
Geochemical work of the Geochemistry and Petrology Branch U.S. Geological Survey
E. Ingerson
1954, Geochimica et Cosmochimica Acta (5) 20-39
The current geochemical work of the Geochemistry and Petrology Branch of the U.S. Geological Survey is outlined under the headings of geochemical compilations, laboratory projects, and field-laboratory projects. Some thirty-seven active projects are described. Six others are mentioned which are planned for the near future. The importance and value of...
A chemical-spectrochemical method for the determination of rare earth elements and thorium in cerium minerals
H. J. Rose Jr., K. J. Murata, M. K. Carron
1954, Spectrochimica Acta (6) 161-168
In a combined chemical-spectrochemical procedure for quantitatively determining rare earth elements in cerium minerals, cerium is determined volumetrically, a total rare earths plus thoria precipitate is separated chemically, the ceria content of the precipitate is raised to 80·0 percent by adding pure ceria, and the resulting mixture is analyzed for...
Discussion of “expansion and increase in permeability of carbonate rocks on heating”
Clifford A. Kaye, John C. Maxwell, Peter Verrall
1953, Eos, Transactions, American Geophysical Union (34) 953-954
Maxwell and Verrall's interesting study raises a thought. If limestones expand on heating and thereby receive a permanent set, as this paper demonstrates, do we not have here a means of determining the maximum temperature to which a particular limestone was ever subjected and indirectly thereby its maximum depth of...
Trap efficiency of reservoirs
Gunnar M. Brune
1953, Eos, Transactions, American Geophysical Union (34) 407-448
Forty-four records of reservoir trap efficiency and the factors affecting trap efficiency are analyzed. The capacity-inflow (C/I) ratio is found to offer a much closer correlation with trap efficiency than the capacity-watershed (C/W) ratio heretofore widely used. It appears likely from the cases studied that accurate timing of venting or...
A contagious disease of salmon, possibly of virus origin
R.R. Rucker, W.J. Whipple, J.R. Parvin, C.A. Evans
1953, Fishery Bulletin (54) 35-46
Production records for 1885, 1891–1908, and 1929–49, indicate cyclic fluctuations for several important species of fish. The average annual take (all species) of 3,582,000 pounds in 1929–49 was 3,503,000 pounds below the 1891–1908 mean of 7,085,000 pounds. Decline in the output of lake herring alone from 5,841,000 pounds in 1891–1908...
Geology, of the High Climb Pegmatite, Custer County, South Dakota
Douglas M. Sheridan
1953, Trace Elements Investigations 231
The High Climb pegmatite, Custer County, S. Dak., belongs to the series of pegmatitic and granitic rocks that characterize the Harney Peak region of the southern Black Hills. It intrudes pre-Cambrian metamorphic rocks consisting chiefly of quartz-mica schist. The country rock has been altered to a tourmaline-rich schist along part...
Occurrences of uranium-bearing minerals in the St. Kevin District, Lake County, Colorado
C. T. Pierson, Q. D. Singewald
1953, Trace Elements Investigations 234
Two hundred and seventy-one prospect pits, mine dumps, or mine workings within the Sugar Loaf-St. Kevin mining districts and vicinity were tested for radioactivity by the U.S. Geological Survey in 1951 during six weeks of investigation on behalf of the Division of Raw Materials of the U.S. Atomic Energy Commission....