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Nonlifting wing-body combinations with certain geometric restraints having minimum wave drag at low supersonic speeds

Nonlifting wing-body combinations with certain geometric restraints having minimum wave drag at low supersonic speeds

Date: January 1, 1957
Creator: Lomax, Harvard
Description: Several variational problems involving optimum wing and body combinations having minimum wave drag for different kinds of geometrical restraints are analyzed. Particular attention is paid to the effect on the wave drag of shortening the fuselage and, for slender axially symmetric bodies, the effect of fixing the fuselage diameter at several points or even of fixing whole portions of its shape.
Contributing Partner: UNT Libraries Government Documents Department
Nonlinear large-deflection boundary-value problems of rectangular plates

Nonlinear large-deflection boundary-value problems of rectangular plates

Date: March 1, 1948
Creator: Wang, Chi-Teh
Description: None
Contributing Partner: UNT Libraries Government Documents Department
A nonlinear theory for predicting the effects of unsteady laminar, turbulent, or transitional boundary layers on the attenuation of shock waves in a shock tube with experimental comparison

A nonlinear theory for predicting the effects of unsteady laminar, turbulent, or transitional boundary layers on the attenuation of shock waves in a shock tube with experimental comparison

Date: September 1, 1958
Creator: Trimpi, Robert L & Cohen, Nathaniel B
Description: None
Contributing Partner: UNT Libraries Government Documents Department
A nonlinear theory of bending and buckling of thin elastic shallow spherical shells

A nonlinear theory of bending and buckling of thin elastic shallow spherical shells

Date: August 1, 1954
Creator: Kaplan, A & Fung, Y C
Description: The problem of the finite displacement and buckling, of a shallow spherical dome is investigated both theoretically and experimentally. Experimental results seem to indicate that the classical criterion of buckling is applicable to very shallow spherical domes for which the theoretical calculation was made. A transition to energy criterion for higher domes is also indicated.
Contributing Partner: UNT Libraries Government Documents Department
Nonmarital Childbearing: Trends, Reasons, and Public Policy Interventions

Nonmarital Childbearing: Trends, Reasons, and Public Policy Interventions

Date: November 20, 2008
Creator: Solomon-Fears, Carmen
Description: This report analyzes the trends in nonmarital childbearing, discusses some of the characteristics of unwed mothers, addresses some issues involving the fathers of children born outside of marriage, covers many of the reasons for nonmarital childbearing, examines the impact of nonmarital births on families and on the nation, and presents the public policy interventions that have been used to prevent nonmarital births or ameliorate some of the negative financial consequences that are sometimes associated with nonmarital childbearing.
Contributing Partner: UNT Libraries Government Documents Department
Nonmetallic diaphragms for instruments

Nonmetallic diaphragms for instruments

Date: January 1, 1925
Creator: Eaton, H N & Buckingham, C T
Description: This report, the second of a series of reports relating to the general subject of instrument diaphragms. The first report of the series was published as Technical Report no. 165, "diaphragms for aeronautic instruments," and comprised an outline of historical developments and theoretical principles. The present report relates entirely to nonmetallic diaphragms, the use of which in certain types of pressure elements has been increasing for some time. Little, if any, information has been available to aid the designer of instruments using this form of pressure element. It was to attempt to meet the need for such information that the investigation reported in this paper was undertaken. The report describes the various materials which have been used as nonmetallic diaphragms, discusses the factors which affect the performance of the diaphragms and gives the results of tests made for the purpose of investigating the effect produced by these factors.
Contributing Partner: UNT Libraries Government Documents Department
Nonmetallic Material Compatibility with Liquid Fluorine

Nonmetallic Material Compatibility with Liquid Fluorine

Date: October 2, 1957
Creator: Price, Harold G , Jr & Douglass, Howard W
Description: Static tests were made on the compatibility of liquid fluorine with several nonmetallic materials at -3200 F and at pressures of 0 and 1500 pounds per square inch gage. The results are compared with those from previous work with gaseous fluorine at the same pressures, but at atmospheric temperature. In general, although environmental effects were not always consistent, reactivity was least with the low-temperature, low-pressure liquid fluorine. Reactivity was greatest with the warm, high-pressure gaseous fluorine. None of the liquids and greases tested was found to be entirely suitable for use in fluorine systems. Polytrifluorochloroethylene and N-43, the formula for which is (C4F9)3N, did not react with liquid fluorine at atmospheric pressure or 1500 pounds per square inch gage under static conditions, but they did react when injected into liquid fluorine at 1500 pounds per square inch gage; they also reacted with gaseous fluorine at 1500 pounds per square inch gage. While water did not react with liquid fluorine at 1500 pounds per square inch gage, it is known to react violently with fluorine under other conditions. The pipe-thread lubricant Q-Seal did not react with liquid fluorine, but did react with gaseous fluorine at 1500 pounds per square inch gage. ...
Contributing Partner: UNT Libraries Government Documents Department
Nonnuclear Industrial Hazardous Waste: Classifying for Hazard Management

Nonnuclear Industrial Hazardous Waste: Classifying for Hazard Management

Date: November 1981
Creator: United States. Congress. Office of Technology Assessment.
Description: An assessment by the Office of Technology Assessment (OTA) that addresses "basic issues surrounding a degree-of-hazard classification approach" and "various methods for applying a degree-of-hazard classification system" (p. iii).
Contributing Partner: UNT Libraries Government Documents Department
Nonpoint Source Water Pollution: Greater Oversight and Additional Data Needed for Key EPA Water Program

Nonpoint Source Water Pollution: Greater Oversight and Additional Data Needed for Key EPA Water Program

Date: May 31, 2012
Creator: United States. Government Accountability Office.
Description: A letter report issued by the Government Accountability Office with an abstract that begins "Under section 319 of the Clean Water Act, state-selected projects to reduce nonpoint source pollution have helped restore more than 350 impaired water bodies since 2000, but other projects have encountered significant challenges. According to GAO survey results, 28 percent of projects did not achieve all objectives originally identified in the project proposal (e.g., implementing the desired number of pollution reduction practices), while many that did so still faced considerable challenges. About half such challenges were beyond staff control (e.g., bad weather or staff turnover), but the other half were challenges that generally could have been identified and mitigated before projects were proposed and selected for funding, such as gaining access to desired properties. In one state, for example, $285,000 in section 319 funds was to subsidize the cost to homeowners of repairing damaged septic systems. Once the grant was awarded, however, one homeowner signed up to participate."
Contributing Partner: UNT Libraries Government Documents Department
Nonprescription Drugs: Considerations Regarding a Behind-the-Counter Drug Class

Nonprescription Drugs: Considerations Regarding a Behind-the-Counter Drug Class

Date: February 20, 2009
Creator: United States. Government Accountability Office.
Description: A letter report issued by the Government Accountability Office with an abstract that begins "In the United States, most nonprescription drugs are available over-the-counter (OTC) in pharmacies and other stores. Experts have suggested that drug availability could be increased by establishing an additional class of nonprescription drugs that would be held behind the counter (BTC) but would require the intervention of a pharmacist before being dispensed; a similar class of drugs exists in many other countries. Although the Food and Drug Administration (FDA) has not developed a detailed proposal for a BTC drug class, it held a public meeting in 2007 to explore the public health implications of BTC drug availability. GAO was asked to update its 1995 report, Nonprescription Drugs: Value of a Pharmacist-Controlled Class Has Yet to Be Demonstrated (GAO/PEMD-95-12). Specifically, GAO is reporting on (1) arguments supporting and opposing a U.S. BTC drug class, (2) changes in drug availability in five countries since 1995 and the impact of restricted nonprescription classes on availability, and (3) issues important to the establishment of a BTC drug class. GAO reviewed documents and consulted with pharmaceutical experts. To examine drug availability across countries, GAO studied five countries it had reported on ...
Contributing Partner: UNT Libraries Government Documents Department