Technical Report Archive and Image Library (TRAIL) - 45 Matching Results

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An Elementary Review of the Mathieu-Hill Equation of Real Variable Based on Numerical Solutions

Description: Abstract: description is given of a large number of trajectories of Mathieu's equation made on the ENIAC in 1948 and available at BRL. A large chart describing the behaviour of the solutions is given. The occasion is taken to review the essentials of the Mathieu theory for the benefit of the occasional user-proceeding from the point of view of an inspection of the numerical data.
Date: April 1955
Creator: Zaroodny, Serge J.
Partner: UNT Libraries Government Documents Department

Uranium in the Southern United States

Description: From introduction: In this study on raw material sources of uranium the Southern Interstate Nuclear Board has catalogued all known occurrences of uranium and some references to thorium in a 17-state area (P1. 1). These occurrences have been evaluated as potential sources of uranium by the State Geological Surveys and the consultant group of SINB. Favorability guides have been applied to the known occurrences and recommendations have been made for future action by the states involved, federal agencies, or by industry. State recommendations are included in state-by-state summaries. The state reports were written either by personnel of the State Geological Surveys or were abstracted from State geological survey data by members of the consultant group...The purpose of this study was to compile information on and systematically assess uranium and other radioactive occurrences in the region. The SINB undertook the project because of its statutory, interstate capability as an extension of government in each of the 17 states, an arrangement that lends itself effectively to this cooperative undertaking.
Date: November 1970
Creator: Southern Interstate Nuclear Board
Partner: UNT Libraries Government Documents Department

Primary Productivity by Phytoplankton in the Tidal, Fresh Potomac River, Maryland, May 1980 to August 1981

Description: Purpose and scope: The purpose of this study was to determine primary productivity and respiration of the fresh, tidal Potomac River. The data will be used by the authors and other researchers involved in modelling chemical and biological properties to calculate phytoplankton growth rates. Methods are documented in detail so that the report could serve as a reference. The report covers the period from May 1980 through August 1981. Five stations were selected for study that are representative of biologically important reaches of the fresh, tidal Potomac River.
Date: 1983
Creator: Cohen, R. H. & Pollock, Sheryl O.
Partner: UNT Libraries Government Documents Department

Map Showing the Difference between the Potentiometric Surfaces of the Magothy Aquifer of September 1975 and September 1982 in Southern Maryland

Description: This is a map, scale 1:250,000, showing the difference between the potentiometric surfaces of the Magothy aquifer of September 1975 and September 1982 in southern Maryland.
Date: 1982
Creator: Mack, Frederick K.; Wheeler, Judith C. & Curtin, Stephen E.
Partner: UNT Libraries Government Documents Department

Chromite and Other Mineral Deposits in Serpentine Rocks of the Piedmont Upland, Maryland, Pennsylvania and Delaware

Description: From abstract: The Piedmont Upland in Maryland, Pennsylvania, and Delaware is about 160 miles long and at the most 50 miles wide. Rocks that underlie the province are the Baltimore gneiss of Precambrian age and quartzite, gneiss, schist, marble, phyllite, and greenstone, which make up the Glenarm series of early Paleozoic(?) age. These are intruded by granitic, gabbroic, and ultramafic igneous rocks. Most of the ultramafic rocks, originally peridotite, pyroxenite, and dunite, have been partly or completely altered to serpentine and talc; they are all designated by the general term serpentine. The bodies of serpentine are commonly elongate and conformable with the enclosing rocks.
Date: 1960
Creator: Pearre, Nancy C. & Heyl, Allen V., Jr.
Partner: UNT Libraries Government Documents Department

Gold Veins Near Great Falls, Maryland

Description: From abstract: Small deposits of native gold are present along an anastomosing system of quartz veins and shear zones just east of Great Falls, Montgomery County, Md. The deposits were discovered in 1861 and were worked sporadically until 1951, yielding more than 5,000 ounces of gold. The vein system and the principal veins within it strike a few degrees west of north, at an appreciable angle to foliation and fold axial planes in enclosing rocks of the Wissahickon Formation of late Precambrian (?) age. The veins cut granitic rocks of Devonian or pre-Devonian age and may be as young as Triassic. Further development of the deposits is unlikely under present economic conditions because of their generally low gold content and because much of the vein system lies on park property, but study of the Great Falls vein system may be useful in the search for similar deposits elsewhere in the Appalachian Piedmont.
Date: 1969
Creator: Reed, John Calvin, Jr. & Reed, John Calvin
Partner: UNT Libraries Government Documents Department

Baltimore Harbor and Channels Deepening Study: Chesapeake Bay Hydraulic Model Investigation

Description: From abstract: Tests on the Chesapeake Bay hydraulic model were conducted to specifically investigate possible changes in the hydrodynamic characteristics of velocity, salinity, and tidal elevations associated with the proposed channel enlargements.
Date: February 1982
Creator: Granat, Mitchell A. & Gulbrandsen, Leif F.
Partner: UNT Libraries Government Documents Department

The Gabbros and Associated Hornblende Rocks Occurring in the Neighborhood of Baltimore, Maryland

Description: From introduction: The present paper is intended as a contribution to our knowledge of a particular phase of metamorphism in eruptive rocks, i.e., that one which is dependent on the secondary development of hornblende by the paramorphism or pseudomorphism of pyroxene.
Date: 1886
Creator: Williams, George Huntington
Partner: UNT Libraries Government Documents Department

Beach and Borrow Site Sediment Investigation for a Beach Nourishment at Ocean City, Maryland

Description: Report describing the methodology used to sample and analyze sediment at Ocean City, Maryland as part of a beach nourishment project. During the project, sediment was moved from borrow sites to construct parts of the beach area; both the borrow sites and native beach were tested.
Date: May 1990
Creator: Anders, Fred J. & Hansen, Mark
Partner: UNT Libraries Government Documents Department

Rehabilitation of the South Jetty, Ocean City, Maryland

Description: Partial abstract: Frequent dredging requirements and scouring at the foundation of Ocean City Inlet's south jetty resulted in a study to determine the source of the shoaling and scouring. The study concluded that sand was being transported northward along Assateague Island, through and over the south jetty, and deposited inside the inlet. The sand was then transported north by ebb currents where it encroached on the Federal navigation channel. A rehabilitation program was initiated to create a littoral barrier to eliminate the shoaling problem and to repair the scour hold. Three headland breakwaters were constructed to stabilize Northern Assateague Island. The site was selected as part of the Monitoring Completed Coastal Projects (MCCP) Program to determine how well the rehabilitation project accomplished its design purpose.
Date: March 1994
Creator: Bass, Gregory P.; Fulford, Edward T.; Underwood, Steven G. & Parson, Larry E.
Partner: UNT Libraries Government Documents Department

Investigation of Lower Coal Beds in Georges Creek and North Part of Upper Potomac Basins, Allegany and Garrett Counties, Maryland: Reserves, Petrographic and Chemical Characteristics of Coals, and Stratigraphy of Area

Description: Report presenting the results of an investigation into various charactaristics that could increase the output lower, thinner coal beds, to replace the upper coal beds which are nearing exhaustion.
Date: 1949
Creator: Toenges, Albert L.; Turnbull, Louis A.; Williams, Lloyd & Smith, H. L.
Partner: UNT Libraries Government Documents Department

Flood Protection Plans for Cumberland, Maryland & Ridgeley, West Virginia: Hydraulic Model Investigation

Description: Report of a hydraulic model investigation "to determine the most economical method of providing protection for Cumberland and Ridgeley against floods somewhat greater than the flood of March 1936 Specifically, the model was used to determine: the proper sections and grades of channels required to pass the design flood with maximum reductions in flood stages; the minimum heights of levees and walls; and the channel treatment required at bridges to insure the safe passage of floodwaters with minimum alterations to the structures" (p. 4).
Date: January 1957
Creator: Waterways Experiment Station (U.S.)
Partner: UNT Libraries Government Documents Department

Mammals of Maryland

Description: Overview of the mammals of Maryland, including descriptions of the orders and maps depicting distribution of the mammals.
Date: April 1969
Creator: Paradiso, John L.
Partner: UNT Libraries Government Documents Department

Review of State Mine Inspector's Reports as They Relate to Accidents from Falls of Roof

Description: Report issued by the U.S. Bureau of Mines over state mine inspection reports from 19 U.S. states. The information in the reports includes details of accidents, locations that specific accidents occurred, and proposed remedies for prevention of future accidents. This report includes tables.
Date: April 1929
Creator: Paul, James Washington
Partner: UNT Libraries Government Documents Department