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Potential flow in engine valves
The extensive applicability of the hydrodynamic theory to the problems of engine construction is clearly shown in the following attempt to determine by exact methods the nature of the flow in valves under variously restricted conditions. Observation shows that two principal kinds of flow occur in simple flat-seated valves. For small valve lifts, the flow is along the horizontal wall and is therefore deflected 90 degrees, but for greater valve lifts the flow separates and forms a free stream, whose angle of deflection naturally increases with increasing lift. Both these kinds of flow can, in fact, be theoretically explained.
Potential flow through centrifugal pumps and turbines
The methods of conformal transformation up to the present have been applied to the potential flows in the rotation of solid bodies only to a limited extent. This report deals with aspects of centrifugal pumps and turbines such as: the complex potential for rotation, potential for the flow due to the blade rotation, velocities at the blade tip, comparison with "infinite number of blades," and a variable number of blades.
Potential for Downward Leakage to the Floridan Aquifer, Green Swamp Area, Central Florida
From introduction: For the purpose of this evaluation, which is qualitative, and which is based on an arbitrary numerical ranking of the thickness and hydraulic conductivity of the different materials involved, the intent was to include only the relatively pure sand beds, which would most readily store and transmit appreciable quantities of water and the clay beds, which would most effectively retard the downward movement of water to the Floridian aquifer.
Potential Hydrologic Impacts of a Tar-Sand Industry in 11 Special Tar Sand Areas in Eastern Utah
From purpose and scope: This report summarizes the hydrology in and near the 11 Special Tar Sand Areas which were designated by the U.S. Bureau of Land Management. The 11 areas are in eastern Utah where normal annual precipitation generally ranges from less than 6 to about 20 inches and runoff is minimal.
Potential Impact of Deep Seabed Mining on the Larvae of Tunas and Billfishes
From introduction: This report describes the biology of tunas and billfishes in the Pacific Ocean, with emphasis on the prime mining areas, examines the probable effects of mining on eggs, larvae and adults, and discusses the significance of adverse effects on the fisheries.
The Potential Radiological Implications of Nuclear Facilities in the Upper Mississippi River Basin in the Year 2000: The Year 2000 Study
From introduction: This study considered the region comprising the Upper Mississippi and Lower Missouri River basins and to assess the contributions to the radiation potentially received by the populace from airborne radionuclides originating in adjacent areas, an "air envelope" zone, some 200 miles wide.
Potential Uranium Host Rocks and Structures in the Central Great Plains
From introduction: This report covers the results of an ERDA-sponsored study to provide a preliminary evaluation of the uranium potential of the central portion of the Great Plains. It was carried out by the University of Kansas under contract number AT (05-1)-1642. This work is part of the ERDA National Uranium Resource Evaluation (NURE) Program. Texas Instruments Incorporated contributed to the study as a subcontractor.
Potentialities of the parachute
The development of the parachute is presented as well as the future possibilities.
Potentiometric Map of the Memphis Sand in the Memphis Area, Tennessee, August 1978
From explanation: This map is based on water level measurements made in wells screened in the Eocene Memphis Sand (formerly "500-foot sand"). Monthly low-water levels for the month of August, 1978 from USGS maintained recorder equipped wells and supplemental measurements made on August 22 and 23 of private and industrial wells were used as control. Water levels are commonly at their lowest for the year during late August of early September (Criner and Parks, 1976).
Potentiometric Surface of Floridan Aquifer May 1975, and Change of Potentiometric Surface 1969 to 1975, Soutwest Florida Water Management District and Adjacent Areas
This is a map of the southwest Florida aquifer.
Potentiometric Surface of the Floridian Aquifer and Its Use in Management of Water Resources, St. Johns River Water Management District, Florida
"The purpose of this report is to explain potentiometric surface maps and their value in assessing the resource, particularly during drought conditions. It is intended to convey a lay understanding of the process by which gains or losses of freshwater storage in the aquifer are determined."
The "Potez 33" military airplane (French)
No Description Available.
The "Potez 39" observation airplane (French) : an all-metal high-wing two-seat monoplane
No Description Available.
Potez 37R2 military airplane : a two-place long-distance observation monoplane
No Description Available.
The Potomac Formation in Virginia
From introduction: The object of this memoir is to give some account of the geology of the lower Potomac formation in Virginia, where it is perhaps most typically developed.
Power Cable Carrier Control (PC3) System
A control system has been developed that uses a carrier signal imposed on an existing ac power circuit to transmit commands. This system was specifically developed to control an entire solar collector field by sending sun-tracking information to the trough collectors or by commanding them to assume safe positions (STOW) if out-of-limit conditions were encountered. Objectives were to develop a control system that operates reliably and has enough functions to control an entire collector field, yet do it at less cost than for conventional approaches. Development, design, operating characteristics, and field testing and results of the new system, the Power Cable Carrier Control (PC³) System are described.
Power characteristics of fuels for aircraft engines
Report presents the summation of results obtained in the testing of fuels of various compositions and characteristics in the altitude laboratory. The data upon which this report is based has had an important influence upon the writing of specifications for the various grades of aviation fuels.
Power Cost Normalization Studies Civilian Power Reactor Program - 1959
Introduction: In connection with the development of a comprehensive plan for a ten year civilian power reactor program, the Evaluation and Planning Branch, Division of Reactor Development, United States Atomic Energy Commission has had a series of status reports prepared to present a comprehensive review of the technical and economic status of various nuclear power reactor concepts.
Power Flattening in Sodium Graphite Reactors by Spatial Variation of Moderator Properties
Abstract: In the present study, the variation of moderator composition was postulated to be effected by the inclusion of varying amounts of beryllium oxide in the graphite of an SGR.
The power of aircraft engines at altitude
The subject of the present paper is confined to the investigations and methods employed by the Fiat company in their studies on the altitude performance of an air-cooled engine of the production type. The experimental set-up as well as test engine data are provided.
Power-off flare-up tests of a model helicopter rotor in vertical autorotation
No Description Available.
Power-off tests of the Northrop N9M-2 tailless airplane in the 40- by 80-foot wind tunnel
Report discussing tests on the N9M-2 airplane to evaluate the airplane efficiency factor and to investigate the characteristics of the aeroboost in the elevon control system. The efficiency factor compared reasonably well to conventional airplanes and the aeroboost system and valve-chatter tests were satisfactory.
Power-off wind-tunnel tests of the 1/8-scale model of the Brewster F2A airplane
No Description Available.
Power-on longitudinal-stability and control tests of the 1/8-scale model of the Brewster F2A airplane equipped with full-span slotted flaps and a new horizontal tail
No Description Available.
Power-on wind-tunnel tests of the 1/8-scale model of the Brewster F2A airplane with full-span slotted flaps
No Description Available.
Power output and air requirements of a two-stroke cycle engine for aeronautical use
This investigation was undertaken to determine the pressure and amount of air necessary for satisfactory high-speed, two-stroke cycle operation and thus permit the power requirements of the air pump or blower to be determined. Based on power output and air requirement here obtained the two-stroke cycle engine would seem to be favorable for aeronautical use. No attempts were made to secure satisfactory operation at idling speeds.
Power Plant Operating and Maintenance Costs
Report issued by the Brookhaven National Laboratory discussing costs of power plant operations. As stated in the objective, "the objective of this study was to determine and evaluate operating and maintenance costs for nuclear power plants" (p. 1). This report includes tables, and illustrations.
Power Reactor Fuel Processing Pilot Plant: Brookhaven Fuel Program
Results of processing 47 metric tons of Brookhaven spent reactor fuel are summarized.
A power-series solution for the unsteady laminar boundary-layer flow in an expansion wave of finite width moving through a gas initially at rest
No Description Available.
Power Supply
Technical drawing of an electric power supply to a nuclear reactor.
Power unit for high-intensity light source
No Description Available.
A Practical Approach to Availability and Irreversibility
From Introduction: "The purpose of this paper is to shed additional light on the techniques of a Second Law Analysis. The stimulus for writing this paper came from questions asked and difficulties that occurred during lectures on the subject at the graduate level. This paper utilizes Keenan's basic approach but presents the material with emphasis upon a clear definition of the work associated with each subsystem in the process."
Practical calculation of second-order supersonic flow past nonlifting bodies of revolution
Calculation of second-order supersonic flow past bodies of revolution at zero angle of attack is described in detail, and reduced to routine computation. Use of an approximate tangency condition is shown to increase the accuracy for bodies with corners. Tables of basic functions and standard computing forms are presented. The procedure is summarized so that one can apply it without necessarily understanding the details of the theory. A sample calculation is given, and several examples are compared with solutions calculated by the method of characteristics.
Practical considerations in specific applications of gas-flow interferometry
No Description Available.
The practical difficulties of commercial flying
This paper relates some of the problems commercial aircraft companies have in attracting larger numbers of paying customers. The author discusses some remedies such as changing the public perception of flying as dangerous.
Practical Evaluation of Electrical-Resistivity Surveys as a Guide to Zinc-Lead Exploratory Drilling, Badger-Peacock Camp and Vicinity, Cherokee County, Kansas
Report issued by the Bureau of Mines over studies conducted on geophysical surveys for exploratory drilling. Electrical-resistivity techniques are discussed. This report includes tables, maps, and illustrations.
Practical experiences with lightning discharges to airplanes
The present report describes many cases of airplanes being struck by lightning and the measures that can be taken to minimize damage to them.
Practical Issues Relating to the Internal Database Predicates in an OR-Parallel Prolog : Extensions and Useful Hacks
This technical report is being written to document and explain some of the insights the authors have gained during the implementation of two OR-parallel Prolog systems for shared-memory multiprocessors. We have been quite amazed by how much power and functionality can be achieved through the implementation of just a few primitive predicates. We introduce a few relatively trivial predicates which allow one to implement versions of findall/3, bagof/3, and setof/3 for the a multiprocessor environment. Then we show how these predicates can be used to implement AND-parallelism. Finally, we illustrate their use for implementing a limited notion of streams, and how such streams can be used to create a compiler that achieves excellent speedups for multiprocessors with a limited number of processors.
Practical method for balancing airplane moments
The present contribution is the sequel to a paper written by Messrs. R. Fuchs, L. Hopf, and H. Hamburger, and proposes to show that the methods therein contained can be practically utilized in computations. Furthermore, the calculations leading up to the diagram of moments for three airplanes, whose performance in war service gave reason for complaint, are analyzed. Finally, it is shown what conclusions can be drawn from the diagram of moments with regard to the defects in these planes and what steps may be taken to remedy them.
Practical methods of calculation involved in the experimental study of an autopilot and the autopilot-aircraft combination
Report presenting practical methods for making the calculations required for the analysis of an autopilot and an autopilot-aircraft combination from frequency-response data. From Summary: "Equations are derived for determining the servo-system error voltage for both displacement input signal and displacement plus rate of displacement input signals, the autopilot frequency response for addition of rate of displacement input signal, the servo-system frequency response for a change of gain, and the relation between open-loop and closed-loop frequency responses for the servo system and the autopilot-aircraft combination."
Practical Possibilities of High-Altitude Flight with Exhaust-Gas Turbines in Connection with Spark Ignition Engines Comparative Thermodynamic and Flight Mechanical Investigations
As a means of preparing for high-altitude flight with spark-ignition engines in conjunction with exhaust-gas turbosuperchargers, various methods of modifying the exhaust-gas temperatures, which are initially higher than a turbine can withstand are mathematically compared. The thermodynamic results first obtained are then examined with respect to the effect on flight speed, climbing speed, ceiling, economy, and cruising range. The results are so presented in a generalized form that they may be applied to every appropriate type of aircraft design and a comparison with the supercharged engine without exhaust-gas turbine can be made.
Practical Reactor Theory
Derivation and basic formulas the physicist or nuclear engineer needs to do the necessary nuclear calculation for a reactor design.
Practical solution of plastic deformation problems in elastic-plastic range
A practical method for solving plastic deformation problems in the elastic-plastic range is presented. The method is one of successive approximations and is illustrated by four examples which include a flat plate with temperature distribution across the width, a thin shell with axial temperature distribution, a solid cylinder with radial temperature distribution, and a rotating disk with radial temperature distribution.
Practical stability and controllability of airplanes
The effect of the characteristics of an airplane on balance, stability, and controllability, based on free flight tests, is discussed particularly in respect to the longitudinal motion. It is shown that the amount of longitudinal stability can be varied by changing the position of the center of gravity or by varying the aspect ratio of the tail plane, and that the stability for any particular air speed can be varied by changing the camber of the tail plane. It is found that complete longitudinal stability may be obtained even when the tail plane is at all times a lifting surface. Empirical values are given for the characteristics of a new airplane for producing any desired amount of stability and control, or to correct the faults of an airplane already constructed. (author).
Practical Superconductor Development for Electrical Power Applications, Annual Report: 1988
Annual report for the superconductor program at Argonne National Laboratory discussing the group's activities and research. This report documents research efforts aimed at producing superconducting components based on oxide systems.
Practical Superconductor Development for Electrical Power Applications, Annual Report: 1989
Annual report for the superconductor program at Argonne National Laboratory discussing the group's activities and research.
Practical Superconductor Development for Electrical Power Applications, Annual Report: 1990
Annual report for the superconductor program at Argonne National Laboratory discussing the group's activities and research. This report describes technical progress of research and development efforts aimed at producing superconducting components based on the Y-Ba--Cu, Bi-Sr-Ca-Cu, Bi-Pb-Sr-Ca-Cu, and TI-Ba-Ca-Cu oxide systems including: synthesis and heat treatment of high-Ta superconductors, formation of monolithic and composite wires and tapes, superconductor/metal connectors, characterization of structures and superconducting and mechanical properties, and fabrication and properties of thin films.
Practical Superconductor Development for Electrical Power Applications, Annual Report: 1991
Annual report for the superconductor program at Argonne National Laboratory discussing the group's activities and research. This report describes technical progress of research and development efforts aimed at producing superconducting components based on the Y-Ba-Cu, BI-Sr-Ca-Cu, Bi-Pb-Sr-Ca-Cu, and TI-Ba-Ca-Cu oxide systems including: synthesis and heat treatment of high-Te superconductors, formation of monolithic and composite wires and tapes, superconductor/metal connectors, characterization of structures and superconducting and mechanical properties, and fabrication and properties of thin films.
Practical Superconductor Development for Electrical Power Applications, Annual Report: 1992
Annual report for the superconductor program at Argonne National Laboratory discussing the group's activities and research. This report describes the technical progress of research and development efforts aimed at producing superconducting components that are based on the Y-Ba-Cu, Bi-Sr-Ca-Cu, Bi-Pb-Sr-Ca-Cu, and (Tl,Pb)-(Ba,Sr)-Ca-Cu oxide systems including: synthesis and heat treatment of high-Ta superconductors, formation of monolithic and composite wires and tapes, superconductor/metal connectors, characterization of structures and superconducting and mechanical properties, fabrication and properties of thin films, and development of prototype components.
Practical Superconductor Development for Electrical Power Applications, Annual Report: 1993
Annual report for the superconductor program at Argonne National Laboratory discussing the group's activities and research. This report describes technical progress of research and development efforts aimed at producing superconducting components in the Y-Ba-Cu, (B1,Pb)-Sr-Ca-Cu, (Tl,Pb,BI)-(Ba,Sr)-Ca-Cu, and Hg-Ba-Ca-Cu-O oxide systems including: synthesis and heat treatment of high-Ta superconductors; formation of monolithic and composite wires, tapes, and coils; characterization of structures and superconducting and mechanical properties; fabrication and properties of films; and development of prototype components.