Collection
Country
States
Counties
Month
14 Matching Results
Results open in a new window/tab.
Results:
1 - 14 of
14
Two-Dimensional Computer Simulation of Hypervelocity Impact Cratering: Some Preliminary Results for Meteor Crater, Arizona
A computational approach used for subsurface explosion cratering was extended to hypervelocity impact cratering. Meteor (Barringer) Crater, Arizona, was selected for the first computer simulation because it is one of the most thoroughly studied craters. It is also an excellent example of a simple, bowl-shaped crater and is one of the youngest terrestrial impact craters. Initial conditions for this calculation included a meteorite impact velocity of 15 km/s, meteorite mass of 1.67 x 10/sup 8/ kg, with a corresponding kinetic energy of 1.88 x 10/sup 16/ J (4.5 megatons). A two-dimensional Eulerian finite difference code called SOIL was used for this simulation of a cylindrical iron projectile impacting at normal incidence into a limestone target. For this initial calculation, a Tillotson equation-of-state description for iron and limestone was used with no shear strength. Results obtained for this preliminary calculation of the formation of Meteor Crater are in good agreement with field measurements. A color movie based on this calculation was produced using computer-generated graphics. 19 figures, 5 tables, 63 references.
Date:
June 1978
Creator:
Bryan, J. B.; Burton, D. E.; Cunningham, M. E. & Lettis, L. A., Jr.
Object Type:
Article
System:
The UNT Digital Library
Carbonaceous Aerosol Particles From Common Vegetation in the Grand Canyon
The problem of visibility reduction in the Grand Canyon due to fine organic aerosol particles in the atmosphere has become an area of increased environmental concern. Aerosol particles can be derived from many emission sources. In this report, we focus on identifying organic aerosols derived from common vegetation in the Grand Canyon. These aerosols are expected to be significant contributors to the total atmospheric organic aerosol content. Aerosol samples from living vegetation were collected by resuspension of surface wax and resin components liberated from the leaves of vegetation common to areas of the Grand Canyon. The samples were analyzed using high-resolution gas chromatography/mass spectrometry (GC/MS). Probable identification of compounds was made by comparison of sample spectra with National Institute of Standards and Technology (NIST) mass spectral references and positive identification of compounds was made when possible by comparison with authentic standards as well as NIST references. Using these references, we have been able to positively identify the presence of n-alkane and n-alkanoic acid homolog series in the surface waxes of the vegetation sampled. Several monoterpenes, sesquiterpenes, and diterpenes were identified also as possible biogenic aerosols which may contribute to the total organic aerosol abundance leading to visibility reduction in the …
Date:
May 1992
Creator:
Hallock, K. A.; Mazurek, M. A. & Cass, G. R.
Object Type:
Report
System:
The UNT Digital Library
Investigation of Uranium Mineralization of the Liba Number 2 and Liba Number 17 Claims Near Cameron, Coconino County, Arizona
Subject: This report presents an investigation of a reportedly large low-grade ore body in the vicinity of Cameron, Arizona.
Date:
January 14, 1957
Creator:
Gray, Irving B.
Object Type:
Report
System:
The UNT Digital Library
Aerial Gamma Ray and Magnetic Survey, Raton Basin Project, The Flagstaff Quadrangle of Arizona: Final Report, Volume 1
From Operations: For the Flagstaff quadrangle, a total of 1930 line miles, excluding reflights and overlaps and missing data were flown by the Tracker and 1348 line miles were flown by the helicopter. The production summary presented below and the detailed daily production in Appendix B describes half of the total project. The Raton Basin Project, of which this quadrangle is a part, covered five other 10 x 2 quadrangles which was or will be covered in separate reports.
Date:
August 1979
Creator:
United States. Department of Energy. Grand Junction Office.
Object Type:
Report
System:
The UNT Digital Library
Preliminary Report of Reconnaissance in the Cameron Area, Arizona
Introduction: A radiometric airborne reconnaissance of the Cameron, Arizona, district was conducted in the late fall of 1952 and early winter of 1953. Flying was carried out under the direction of the Salt Lake Exploration Branch of the Atomic Energy Commission, Division of Raw Materials. Airborne equipment and ground personnel were provided through the Technical Services Branch of the Grand Junction Exploration Division.
Date:
June 1953
Creator:
Williams, Floyd J. & Barrett, Donald C.
Object Type:
Report
System:
The UNT Digital Library
Mineral Resources of the Emmett Wash Wilderness Study Area, Coconino County, Arizona
This report presents the results of a mineral survey of the Emmett Wash Wilderness Study Area, Coconino County, Arizona.
Date:
1982
Creator:
Lane, Michael E.
Object Type:
Report
System:
The UNT Digital Library
Mineral-Resource Potential of the Paria Plateau Wilderness Study Area, Coconino County, Arizona
This report presents the results of a mineral survey of the Paria Plateau Wilderness Study Area, Coconino County, Arizona. Originally done as the Navajo Application, Arizona, Study Area pursuant to an agreement between IFOC-DFO-MLA dated 1/29/80.
Date:
1982
Creator:
Lane, Michael E.
Object Type:
Report
System:
The UNT Digital Library
Examination of Copper-Uranium Occurrences in the Willaha Area, Coconino County, Arizona
Abstract: A study, consisting of field and laboratory work, was undertaken in an endeavor to establish possible structural mineralization controls associated with the copper-uranium occurrences in the Willaha area, Coconino County, Arizona. Uranium mineralization, apparent at present, is localized along small fissures and vugs and in certain beds and lenses of the middle member of the Kaibab formation(Permian). It is associated with copper and iron oxide staining. Though no definite ore controls were disclosed by this study, at least a limited program of shallow drilling is warranted on the property. This sub-surface exploration should determine possible extensions of known mineralized areas, explore surface radiometric anomalies, and provide data for the determination of possible guides to ore. Deeper exploration may encounter mineralization in other horizons of the Kaibab limestone.
Date:
September 1954
Creator:
Puttuck, Harry E.
Object Type:
Report
System:
The UNT Digital Library
Copper-Uranium Deposit at the Ridenour Mine, Hualapai Indian Reservation, Coconino County, Arizona. Part 1. Supplement: Results of an Aerial Radiometric Examination of the Ridenour Mine District, Hualapai Indian Reservation, Coconino County, Arizona
None
Date:
August 1, 1954
Creator:
Lovejoy, Earl M. P.
Object Type:
Report
System:
The UNT Digital Library
An Occurrence of Rhenium, Associated with Uraninite in Coconino County, Arizona
From introduction: Twenty-nine samples of sedimentary rocks of Triassic age from the Sun Valley uranium mine in northern Arizona were analyzed spectrographically, and 11 of these samples contained 0.005 to 0.1 percent of the rare metallic element, rhenium.
Date:
August 1957
Creator:
Petersen, Richard G.; Hamilton, John C. & Myers, Alfred T.
Object Type:
Report
System:
The UNT Digital Library
Aerial Gamma Ray and Magnetic Survey, Raton Basin Project: Flagstaff Quadrangle, Arizona: Final Report, Volume 1, Appendix C
Appendix containing tables to accompany a report on aerial gamma ray and magnetic survey of Raton Basin in Flagstaff Quadrangle in Arizona.
Date:
August 1979
Creator:
Geometrics
Object Type:
Dataset
System:
The UNT Digital Library
Preliminary Geologic Map of the Paria Plateau NW Quadrangle, Coconino County, Arizona
Preliminary 16 x 7.5 minute map of the Paria Plateau NW quadrangle, showing geology, roads, drainage, meridians and parallels, triangulation stations, and air-photo centers and wing points.
Date:
unknown
Creator:
Wells, John David
Object Type:
Map
System:
The UNT Digital Library
Analyses of Coals in the United States with Descriptions of Mine and Field Samples Collected between July 1, 1904 and June 30, 1910: Part 1. -- Analyses
From Significance and value of Analyses of Coal: "The analyses published in this report cover samples of coal collected in many different parts of the country with unusual care by experiences men, in such manner as to make them representative of extensive beds of coal."
Date:
1913
Creator:
Lord, N. W.
Object Type:
Report
System:
The UNT Digital Library
Analyses of Coals in the United States with Descriptions of Mine and Field Samples Collected between July 1, 1904 and June 30, 1910 Part 2. Descriptions of Samples
From Introduction: "This volume contains the descriptions of the samples whose analyses are published in the preceding volume, Part I of this bulletin. The descriptions have been compiled from the notebooks of the persons who collected the samples, have been condensed from accounts given in published reports of the United States Geological Survey, or have furnished by the collection themselves. Inasmuch as the descriptions represent the work of many persons during a period of six years, and inasmuch as they were recorded under widely differing conditions, they necessarily vary in fullness detail."
Date:
1913
Creator:
Lord, N. W.
Object Type:
Report
System:
The UNT Digital Library