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656 Matching Results
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656
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Investigation of a nonlinear control system
A discontinuous variation of coefficients of the differential equation describing the linear control system before nonlinear elements are added is studied in detail. The nonlinear feedback is applied to a second-order system. Simulation techniques are used to study performance of the nonlinear control system and to compare it with the linear system for a wide variety of inputs. A detailed quantitative study of the influence of relay delays and of a transport delay is presented.
Date:
April 1957
Creator:
Flügge-Lotz, I. & Taylor, C. F.
Object Type:
Report
System:
The UNT Digital Library
Central Automatic Data Processing System
A series of papers describing a system that will automatically record as many as 300 pressures, 200 voltages, and 24 frequencies in as little as 30 seconds to an accuracy of 0.15 percent or better of full-scale range. The information is able to be used in any high-speed, general-purpose digital computer. The computer will accept the encoded data produced by the recording system and automatically calibrates it, takes averages, forms ratios, and does terminal calculations such as mass flow, momentum, distortion numbers, drag coefficients, thrust, specific fuel consumption, and efficiency.
Date:
April 1958
Creator:
Staff of the Lewis Laboratory
Object Type:
Report
System:
The UNT Digital Library
Pathfinder Atomic Power Plant Technical Progress Report: October 1, 1958-December 31, 1958
Introduction: This is the fifth of a series of reports covering technical progress on the research and development program being performed in connection with the design of the Pathfinder Atomic Power Plant.
Date:
April 18, 1955
Creator:
Allis-Chalmers Manufacturing Company
Object Type:
Report
System:
The UNT Digital Library
Summary Technical Report for the Period January 1, 1956 to March 31, 1956
Studies were continued on the laberatory evaluation of Canadian gravity concentrate, processing of Th-containing U concentrates, extraction of U in a HNO/ sub 3/--TBP--UNH system, corrosion rates of stainless steel in 70% HNO/sub 3/, denitration process, corrosion resistance of chrome-plated drum dryer to raffinate solutions, UO/sub 2/F/sub 2/ reduction process, process studies in the UO/sub 3/ to UF/sub 4/ process, effects of reduction temperature and degree of hydration on reactivity of UO/sub 2/ pellets, conversion of ammonium diuranate to UF/sub 4/, reduction of UF/sub 4/, melting and casting of Nb--U alloys, production of U washers, recovery of U from scrap material, and fabrication of Th electrodes. New processes, special problems, and wet chemical and spectrochemsical development were considered. (For preceding period see NLCO- 601.) (J.R.D.)
Date:
April 16, 1956
Creator:
Simmons, J. W.
Object Type:
Report
System:
The UNT Digital Library
Savannah River Plant, Works Technical Department monthly progress report for March 1956
This document details activities of the Works Technical Department during the month of March 1956. It covers reactor technology, separations technology, engineering assistance and heavy water technology.
Date:
April 18, 1956
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Petrographical Investigations of the Salt Wash Sediments, Annual Technical Report: 1954
Abstract: This report consists of four parts, the first three being descriptions of investigations compiled in the period October 1st, 1953 to April 1st, 1954; the fourth part is a summary of progress of the research based on our entire investigations completed prior to April 1st, 1954. The first part comprises a set of preliminary experiments investigating the mineral composition of the sandstones in thin sections, in an attempt to differentiate barren from ore-bearing sandstones. It appears that there are more rock-fragments and particularly more volcanic rock fragments in the ore zone (zone 4, Well C, Bull Canyon). In addition, silica cement appears to be associated with ore and carbonate cement with barren sediments. The second part details the investigation of the mudstones of the Bull Canyon Wells . A mixed layer lattice "illite" and a kaolin mineral are the most prominent in "normal" mudstones. Dye tests suggest there are differences between the clay minerals in the sandstone matrix of the ore zone and barren zone. In addition, the mudstone zones appear to differ in the response to the dye tests. The third part of the report details the bulk density determinations for cores from well B. The results confirm …
Date:
April 1954
Creator:
Griffiths, John C.; Cochran, J. A.; Groff, D. W. & Kahn, James Steven
Object Type:
Report
System:
The UNT Digital Library
A Flight Evaluation and Analysis of the Effect of Icing Conditions on the ZPG-2 Airship
"A series of test flights was conducted by the U. S. Navy over a 3- year period to evaluate the effects of icing on the operation of the ZPG-2 airship. In supercooled. clouds, ice formed only on the forward edges of small protuberances and wires and presented no serious hazard to operation. Ice accretions of the glaze type which occurred in conditions described as freezing drizzle adversely affected various components to a somewhat greater extent" (p. 1).
Date:
April 1958
Creator:
Lewis, William & Perkins, Porter J., Jr.
Object Type:
Report
System:
The UNT Digital Library
Flight investigation of the effectiveness of an automatic aileron trim control device for personal airplanes
Report presenting a flight investigation to determine the effectiveness of an automatic aileron trim control device installed in a persona airplane to augment the apparent spiral stability. The device utilizes a rate-gyro sensing element in order to switch an on-off type of control that operates the ailerons at a fixed rate through control centering springs. Results for the basic airplane, the airplane with automatic control, and the pilots' opinion of the automatic system are provided.
Date:
April 1956
Creator:
Phillips, William H.; Kuehnel, Helmut A. & Whitten, James B.
Object Type:
Report
System:
The UNT Digital Library
Further Experiments on the Stability of Laminar and Turbulent Hydrogen-Air Flames at Reduced Pressures
"Stability limits for laminar and turbulent hydrogen-air burner flames were measured as a function of pressure, burner diameter, and composition. On the basis of a simple flame model, turbulent flashback involved a smaller effective penetration distance than laminar flashback. No current theoretical treatment predicts the observed pressure and diameter dependence of laminar and turbulent blowoff" (p. 1).
Date:
April 1957
Creator:
Fine, Burton
Object Type:
Report
System:
The UNT Digital Library
ION EXCHANGE OF TRACE COMPONENTS IN A COUNTER-CURRENT EQUILIBRIUM STAGE CONTACTOR. TECHNICAL REPORT NO. 3
None
Date:
April 1, 1953
Creator:
Hiester, N.K.; Phillips, R.C.; Fields, E.F.; Cohen, R.K. & Radding, S.B.
Object Type:
Report
System:
The UNT Digital Library
An experimental investigation of the effect of surface heating on boundary-layer transition on a flat plate in supersonic flow
Report presenting wind-tunnel testing to investigate the effect of surface heating on boundary-layer transition on a flat plate. The identification of the onset and end of transition was made by inspection of the curves of surface-tube Mach number reading as a function of length Reynolds number obtained through the transition region.
Date:
April 1951
Creator:
Higgins, Robert W. & Pappas, Constantine C.
Object Type:
Report
System:
The UNT Digital Library
Cooperative Investigation of Relationship Between Static and Fatigue Properties of Wrought N-155 Alloy at Elevated Temperatures
Note presenting extensive data relating properties of wrought N-155 alloy under static, combined static and dynamic, and completed reversed dynamic stress conditions. Time periods for fracture ranged from 50 to 500 hours at room temperatrue, 1000, 1200, 1350, and 1500 degrees Fahrenheit. Results regarding the rupture and fatigue strengths, fatigue strengths based on cycles to failure, influence of superimposed fatigue loads on creep, influence on superimposed fatigue stress on elongation in the rupture test, stress-strain characteristics under fatigue loading, damping effects, influence of cyclic speed on fatigue properties, influence of notches on fatigue, surface finish, and limitations of findings are provided.
Date:
April 1955
Creator:
NACA Subcommittee on Heat-Resisting Materials
Object Type:
Report
System:
The UNT Digital Library
The Gust and Gust-Load Experience of a Twin-Engine Low-Altitude Transport Airplane in Operation on a Northern Transcontinental Route
"An analysis of the gust and gust-load experience of a low-altitude transcontinental transport airplane, based on 834 hours of VGH record, is presented. The relation of gust experience to airspeed, altitude, season of the year, and flight condition is considered. An estimate of the overall gust history for the present type of operations is derived from a synthesis of the VGH data and available V-G data" (p. 1).
Date:
April 1952
Creator:
Press, Harry & McDougal, Robert L.
Object Type:
Report
System:
The UNT Digital Library
Possible Radiation Damage to the Stator Windings of the HRT Circulating Pump
A study of the degree and effects of radiation damage to the motor winding of the HRT 400-! canned motor circulating pumps was made. With the gamma flux estimate and the available radiation damage data, the effective life of the stator windings was estimated to be about one year, for normal operation of the pump and motor.
Date:
April 80, 1957
Creator:
Gift, E. H.
Object Type:
Report
System:
The UNT Digital Library
Recommended Practices for Establishment and Maintenance of Turf
"The intent of this report is to provide technical and practical information which will be of value to those responsible for preparation, review or accomplishment of specifications for the establishment of vegetative ground cover. [...] The report is concerned primarily with establishment of turf grasses in the continental United States. A brief discussion of maintenance practices is included as such practices have a direct bearing on the successful establishment of the desired ground cover" (p. 1).
Date:
April 1953
Creator:
Cale, E. B.
Object Type:
Report
System:
The UNT Digital Library
Effect on longitudinal stability and control characteristics of a Boeing B-29 airplane of variations in stick-force and control-rate characteristics obtained through use of a booster in the elevator-control system
A longitudinal stability and control characteristics of a Boeing B-29 airplane have been measured with a booster incorporated in the elevator-control system. Tests were made to determine the effects on the handling qualities of the test airplane of variations in the pilot's control-force gradients as well as the effects of variations in the maximum rate of control motion supplied by the booster. The results of the control-rate investigation indicate that large airplanes may have satisfactory handling qualities with the booster adjusted to give much lower rates of control motion than those normally used by pilots.
Date:
April 12, 1950
Creator:
Mathews, Charles W.; Talmage, Donald B. & Whitten, James B.
Object Type:
Report
System:
The UNT Digital Library
Liquid Metal Fuel Reactor Experiment: Quarterly Technical Report, April-June, 1959
Liquid Metal Fuel Reactor Experiment program quarterly technical report.
Date:
1959-04/1959-06
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Preliminary Hazards Summary Report: Part B. License Application
From acknowledgement: This report was prepared as a joint effort by the personnel of Yankee Atomic Electric Company, Westinghouse Electric Corporation, and Stone & Webster Engineering Corporation for the purpose of preparing an operating license application.
Date:
April 1957
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Hanford Control Instrumentation and Procedures
This paper discusses technical bases, operating standards, and instrumentation systems required to achieve the goal of nuclear safety in operation of high-level reactors. Because of the relatively long neutron lifetime in a thermal reactor and the comparatively modest time rates of reactivity change associated with fission poison and temperature effects, the rod system used for compensating reactivity transients and for maintaining flux distribution control may be operated manually. Manual operation of the reactor and the prediction of pile reactivity statue during outages of course involve factors of human error, normal reaction time, and judgment. It is the aim to specify procedures for the operation such that manual control of the reactor may be adequately maintained at all times within the range of reasonably expected calculational errors and human reaction times. The technical considerations used in developing these standards, including the available monitoring indications are discussed first; then the automatic trip devices which should back up the procedures are also mentioned.
Date:
April 6, 1956
Creator:
Fullmer, G. C.
Object Type:
Report
System:
The UNT Digital Library
U.S. Geological Survey Fluorimetric Methods of Uranium Analysis
From Foreword: "This manual was written to serve as a guide for analysts interested in the determination of small amounts of uranium. All of the methods presented here have been developed in the U.S. Geological Survey and are based on the measurement of the fluorescence of uranium in fluoride melts."
Date:
April 1952
Creator:
Grimaldi, F. S.; May, Irving & Fletcher, Mary H.
Object Type:
Report
System:
The UNT Digital Library
Description of Purex Plant Process
A brief summary, with reference literature for details, of pertinent and important process flowsheet conditions which are in use in the Purex Process is presented. (auth)
Date:
April 30, 1959
Creator:
Irish, E. R.
Object Type:
Report
System:
The UNT Digital Library
Nuclear Metallurgy Lectures: Chapter 4
This document comprises chapter four of nuclear metallurgy lectures. This chapter provides a discussion of pile components and related reactor kinetics.
Date:
April 29, 1955
Creator:
Lang, L. W.
Object Type:
Report
System:
The UNT Digital Library
CLOTHING DECONTAMINATION AND EVALUATION OF LAUNDRY METHODS
The over-all objectives of this project encompassed testing the suitability of standard and special laundering methods and standard equipment for field decontamination of clothing; evaluating the contaminability and decontaminability of selected fabrics, and testing of experimental clothing monitoring instruments. Garments and fabrics contaminated by controlled methods were used during the operation for testing the equipment and evaluating fabrics and formulae. 8tandard Army laundering methods and equipment, including wooden washers, were effective for decontaminating clothing in the field. A decontaminating laundry formula employing citric acid and tartaric acid followed by either an organic or inorganic chelating agent results in a higher degree of decontamination than other formulae tested. The standard Quartermaster Corps mobile field laundry formula resulted in satisfactory decontamination with the type of soil and activity encountered and the cost of supplies is approximately one-tenth as much as the special formulae. Woolen garments and fabric swatches were decontanninated by laundering as readily as cotton or synthetic fabrics. Clothing monitoring instruments under development appear suitable for monitoring clothing under field conditions to determine the degree of contamination both before and after precessing. (auth)
Date:
April 1, 1952
Creator:
Hughes, D. C.; Parthum, A. H., Jr.; James, H. & McWhorter, J. C., Jr.
Object Type:
Report
System:
The UNT Digital Library
Hanford Atomic Products Operation monthly report, March 1954
This document presents a summary of work and progress at the Hanford Engineer Works for March 1954. The report is divided into sections by department. A plant wide general summary is included at the beginning of the report, after which the departmental summaries begin. The Manufacturing Department reports plant statistics, and summaries for the Metal Preparation, Reactor and Separation sections. The Engineering Department`s section summaries work for the Technical, Design, and Project Sections. Costs for the various departments are presented in the Financial Department`s summary. The Medical, Radiological Sciences, Utilities and General Services, Employee and Public Relations, and Community Real Estate and Service departments have sections presenting their monthly statistics, work, progress, and summaries.
Date:
April 23, 1954
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library