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  • 1
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    Test methods and results of the 10-cell bipolar Ni-H2 battery (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: Characterization tests were carried out at three charge levels and four discharge levels. The "c' or capacity of the battery is designated at 6.5 ampere-hours. The recharge ampere-hours was the same for all test conditions, 6.5 A-H, regardless of the discharge capacity removed for any particular discharge rate. Less capacity can be removed at higher discharge rates to the same termination voltage, which was 0.50 volts for the weakest (lowest voltage) cell. The general trend of efficiencies increases as the charge rate increases as noted in results of the table included in the handout package. The data also indicate the efficiency increases as the discharge rate decreases. This is true; however, efficiencies at the discharge rates of c and 2c are penalized because these cycles received more overcharge than necessary.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 496-500
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  • 2
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    Determination of the reliability of Ni-Cd batteries from survival data on cells fabricated 1964 - 1977 (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: The probability of Ni-Cd battery survival was determined by researching survival data on cells fabricated from 1964-1977. A log of cell failure times were plotted against cumulative failure percentage and mean and standard deviation were determined.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 470-479
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  • 3
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    Experimental design (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: The design of long life, low weight nickel cadmium cells is studied. The status of a program to optimize nickel electrodes for the best performance is discussed. The pore size of the plaque, the mechanical strength and active material loading are considered in depth.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 253-469
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  • 4
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    Advanced nickel hydrogen cell configuration study (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: An evaluation of the current nickel hydrogen cell design is presented. The IPV, or the Individual Pressure Vessel, is the state of the art right now. The present design, 3 1/2 inch cell, has a current limit of 50 ampere-hours. The nickel hydrogen cell design is the state of the art. Its size is 3 1/2 inches which limits it to 50 hours. The probable limits of that are probably 160 amphere IPV cell remaining in the passive cooling mode. The IPV stacks is a parallel connection of electrodes. Positive electrodes are connected with leads to the top portion of the stack and negative electrodes are connected with leads and pulled down to the bottom. So it is a combination connection of paralleling series electrostacking--parallel inside each individual stack, and series connected from one stack to the next. It offers, in the analysis, improvements in packaging, cost, energy density, and specific energy.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 480-495
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  • 5
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    Nickel hydrogen/nickel cadmium battery trade studies (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: Nickel Hydrogen cell and battery technology has matured to the point where a real choice exists between Nickel Hydrogen and Nickel Cadmium batteries for each new spacecraft application. During the past few years, a number of spacecraft programs have been evaluated at Hughes with respect to this choice, with the results being split about fifty-fifty. The following paragraphs contain criteria which were used in making the battery selection.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 430-438
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  • 6
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    Canadian experience with nickel cadmium systems (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: The Defense Research Establishment Ottawa (DREO) has been studying the nickel-cadmium system, both vented and sealed, since the early 1950's. Reasonable success has been achieved in a wide variety of applications covering: military vehicle use under Arctic conditions; high performance military aircraft; manpacked communications sets; remote standby power and small portable instrumentation. Early studies on the vented system for high rate vehicle and aircraft cranking applications proved useful in later studies on the sealed NiCd system. This was especially true in the areas of plate loading and electrolyte composition. To achieve high rate cranking currents of 20C to 30C, it was necessary to have light to moderate plate loadings, a large reactive surface area, and electrolyte of optimum conductivity. DREO undertook some fundamental studies to understand the system from the inside out rather than test cells from the outside and then analyze their components. The conclusions of these studies were incorporated into the Procurement Specification for Ni-Cd cells ISISA Spec S615-P-2. A brief comment will be made on the choice of cell design and how some of the factors of cell manufacture could affect cell performance.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 439-451
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  • 7
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    Real and potential nickel hydrogen superiority (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: Events from the development and orbital flight experience with a nickel hydrogen battery are described. The events highlight characteristics of nickel hydrogen which afford superior capability in overcharge, overdischarge and state of charge evaluation, when compared to the nickel cadmium electrochemical system. Some developments in nickel hydrogen technology that provide the potential of furthering nickel hydrogen superiority for satellite applications are also discussed.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 416-429
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  • 8
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    Ni-H2 batteries for communications satellites (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: Ni-H2 batteries are just now being put into service. All of the remaining INTELSAT V satellites (approximately 10), starting with the next to be launched in early 1983, will use Ni-H2 batteries. In addition, the next generation of INTELSAT VI satellites, and probably INTELSAT VII and VIII, will use Ni-H2 batteries. This means that international telecommunications satellites will use Ni-H2 batteries through the 1990's. It is projected that the lifetime of these batteries will be greater than 10 years at deep depth-of-discharge (DOD), and that the battery subsystem will no longer limit satellite lifetime or communications capability during eclipse periods. This paper discusses the advantages of the Ni-H2 battery, as compared with the Ni-Cd battery, for telecommunications satellites.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 389-415
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  • 9
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    Status of SAFT silver hydrogen cell development (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: Nickel-hydrogen cells appear to be an improvement over the nickel-cadmium in applications requiring longer lifetime and reduced weight. An even more efficient couple, the silver-hydrogen couple, is also considered. After a theoretical study first performed by the Battelle Institute of Geneva under ESA (European Space Agency) contract, SAFT has undertaken more detailed analyses of the silver-hydrogen degradation mechanisms. ESA and the French Department of Defense contracted with SAFT for a full-development program of the silver-hydrogen technology.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 347-371
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  • 10
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    Reconditioning and the nickel electrode (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: This effects of reconditioning on the performance of NiCd batteries are reviewed. These effects are correlated with cell experiments and individual electrode investigations. The effects of reconditioning on the positive electrode performance are found to be significant. A mechanism is proposed that rationalizes the operation of the nickel electrode and suggests that reconditioning minimizes depth of discharge stress during use and maintains uniformity of the active material.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 324-345
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  • 11
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    Spacecraft battery reconditioning cost considerations (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: Cost considerations for spacecraft battery reconditioning are studied. Results indicate that the cost of performing reconditioning is minuscule compared with spacecraft system investment. Results also indicate that spacecraft life extension of a few days justifies incorporation of reconditioning circuitry.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 303-310
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  • 12
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    Unique battery reconditioning cycle for RCA's geostationary satellites and its applicability for low Earth satellite (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: Six (6) geostationary spacecraft, manufactured by RCA Astro, are presently operating in orbit. All of their batteries are performing well. They all contain unique battery reconditioning circuitry, permitting individual cell reconditioning to practically zero volts without the danger of cell reversal. This reconditioning is performed just prior to start of each eclipse season. This technique has maintained the battery's end-of-discharge voltage with mission life. The oldest operating RCA Astro geostationary spacecraft, Satcom F1 and F2, have now completed almost 7 and 6-3/4 years in orbit, respectively. Their battery performance, reported herein, show that a major milestone in the mission longevity of nickel-cadmium batteries has heen achieved. Low earth orbit test data show a long lasting effect of maintaining end-of-discharge voltages for nickel cadmium cells using periodic reconditioning. The unique RCA light-weight reconditioning circuitry can accomplish a quick reconditioning and prevent cell reversal. Reconditioning, thus, has the potential for extending mission life of geostationary as well as low earth orbit spacecraft, when two or more batteries are present.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 311-323
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  • 13
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    Deep discharge reconditioning: Pros and cons (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: Deep-discharge reconditioning (DDR) can be of great benefit to battery performance, especially in geosynchronous orbit, if performed properly and regularly, and can be essential to operation of batteries at the high depths of discharge (DOD) required to minimize weight. The procedure should be tailored to fit the nature of the degradation occuring during regular cycling. DDR is not without its drawbacks, however, and these differ depending on the normal DOD to be sustained and/or whether the discharge is done at the battery or the cell level. Battery-level discharge carries the minimum weight penalty but raises questions of the effects of low-rate cell reversal that as yet have no firm answers. Cell level discharge avoids cell reversal but carries significant penalties of weight and complexity. Thus no universal procedure or method of implementation of deep-discharge reconditioning is now available and thus the various approaches must be evaluated for each application.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 297-302
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  • 14
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    Control requirements for future battery systems (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: It is argued that sophisticated battery control systems are required to support the high power, high energy spacecraft secondary battery systems of the post 1985 time period. Four categories of battery control system functions are defined and discussed: battery operational control, auxiliary system control, battery system status indication and fault detection fault isolation. A concept for implementation of such a control system is also presented and discussed.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 270-279
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  • 15
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    A comparison of voltage limit charge control for fixed array and sun oriented array missions (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: A comparison of voltage limited control methods limit control methods for fixed array and oriented array missions is given. The LANDSAT D, Earth Radiation Budget Experiment and Solar maximum Mission techniques are compared.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: The 1982 Goddard Space Flight Center Battery Workshop; p 231-258
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  • 16
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    Battery charge control with temperature compensated voltage limit (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: Battery charge control for orbiting spacecraft with mission durations from three to ten years, is a critical design feature that is discussed. Starting in 1974, the General Electric Space Systems Division designed, manufactured and tested battery systems for six different space programs. Three of these are geosynchronous missions, two are medium altitude missions and one is a near-earth mission. All six power subsystems contain nickel cadmium batteries which are charged using a temperature compensated voltage limit. This charging method was found to be successful in extending the life of nickel cadmium batteries in all three types of earth orbits. Test data and flight data are presented for each type of orbit.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 259-269
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  • 17
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    Computer modeling of batteries from non-linear circuit elements (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: A simple non-linear circuit model for battery behavior is given. It is based on time-dependent features of the well-known PIN change storage diode, whose behavior is described by equations similar to those associated with electrochemical cells. The circuit simulation computer program ADVICE was used to predict non-linear response from a topological description of the battery analog built from advice components. By a reasonable choice of one set of parameters, the circuit accurately simulates a wide spectrum of measured non-linear battery responses to within a few millivolts.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 201-215
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  • 18
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    Modeling a Li/SOCl2 battery for design purposes (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: A generalized code applicable to many different electrochemical systems and geometric designs is discussed. The code is to be set up so that physical property data such as thermal conductivity, viscosity, density, and configuration (e.g. physical dimensions) are the input data. Thus, by changing these parameters many different battery configurations can be handled. The outputs, as a function of time and space, are voltage, current, temperature, pressure, velocity, and species concentration.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 178-199
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  • 19
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    Fitting voltage curves with an electrochemically derived equation (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: Previous work is refined and extended to describe the discharge curve of Ni-Cd cells. Several models are discussed which are based on chronopotentiometry theory and on a thermodynamic approach. Emphasis is placed on improvement of the fit for the initial portion of discharge. Equations are presented which improve the fit for all regions of the discharge curve.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 164-177
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  • 20
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    Battery model for electrical power system energy balance (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: A model to simulate nickel-cadmium battery performance and response in a spacecraft electrical power system energy balance calculation was developed. The voltage of the battery is given as a function of temperature, operating depth-of-charge (DOD), and battery state-of-charge. Also accounted for is charge inefficiency. A battery is modeled by analysis of the results of a multiparameter battery cycling test at various temperatures and DOD's.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 117-124
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  • 21
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    Validating cell/battery safety (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: Using the accelerating rate calorimeter, the hazards associated with exothermic reactions occurring in Li/SO2 cells under the conditions of discharge, forced overdischarge, resistive overdischarge, and forced overdischarge at low tempratures are quantitatively defined in terms of: rate of pressure generation, overall pressure rise, rate of temperature, and overall heat generation. Consistent with the findings of other investigators, it is believed that the major reactions contributing to Li/SO2 cell exothermicity are: the lithium/acetonitrile reaction, the thermal decomposition of lithium dithionite, and the lithium/sulfur reaction.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 85-99
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  • 22
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    Design of a safe cylindrical lithium/thionyl chloride cell (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: Cell design criteria were established which can result in a safe lithium/thionyl chloride cell. A cell vent, a low area internal anode cell, cell balance and composition of the cathode-electrolyte solution were found to be important factors in the design of a safe cell. In addition to routine testing, both undischarged and discharged cells were subjected to electrical abuse, environmental abuse and mechanical abuse without disassembly.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 75-84
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  • 23
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    Controlling hazardous reactions during voltage reversal of high energy lithium cells (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: The roll of general cell design characteristics in preventing hazardous reactions during voltage reversal of lithium cells is discussed. Anode limited versus cathode limited design and case positive versus case negative design are addressed.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 67-74
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  • 24
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    Safety tests (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: The ovedischarge test program and results for double A and D lithium cells are discussed. Temperature increases and sparking responses are dressed.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 60-63
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  • 25
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    Low temperature performance tests (1983)
    In:  CASI
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    Publikationsdatum: 2006-02-14
    Beschreibung: Lithium cell performance at extremely low temperatures was tested and materials which could be used to make a cell completely electro-chemically inert for the purpose of deactivation were investigated. The effects of temperature and current density on polarization and performance loss are discussed along with discharge recovery behavior.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 64-66
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  • 26
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    Policies governing the use of lithium batteries in the Navy (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: Lithium batteries offer many advantages for Navy systems but may also exhibit undesirable hazardous behavior. Safety problems have been traced to a variety of chemical and physical causes. The Navy has established a central safety office with responsibility for all lithium battery use. Before an item is approved for Navy use, it must pass both a design review and a set of end item tests. These reviews focus on complete systems which include a battery inside the end item. After system approval, specific regulations govern the transportation, storage, and disposal of the unit containing lithium batteries. Each of these areas is discussed in detail.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 23-34
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  • 27
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    The Galileo probe Li/SO2 battery: The safest battery on Jupiter (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: The unique power requirement of NASA's Galileo Jupiter Probe are most readily met by a Li/SO2 battery; however, because this battery system is not space flight proven, extensive effort was required to qualify this device from the stand point of performance and safety. Due to the rather checkered safety record of the Li/SO2 system, safety has been foremost among the design considerations and has been addressed at the cell, battery and system level. The mission requirements which led to the choice of the Li/SO2 battery and the safety engineering which went into the battery and power system design are described.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 15-22
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  • 28
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    forced overdischarge related safety aspects of Li/SO2 and Li/SOCl2 cells (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: Results of an experiment investigating overdischarge behavior of two types of Li/SO2 cells are presented. Forced overdischarges of the Li/LiBr, CH3CN/SO2 cell can result in unsafe behavior such as venting with fire and release of toxic gases. The hazards may be minimized or eliminated by careful cell design considerations and practice of high standards of quality contol in cell manufacture. Seemingly safe cells at 25 C when forced overdischarged at -25 C, even at low currents, exhibited incipient signs of hazards. Their cathodes indicated signs of shock sensitivity. Cathode limited Li/SOCl2 cells were safe during forced overdischarge for long periods of time. Lithium limited Li/SOCl2 cells in which practically all Li had been used up before cell reversal did not exhibit hazardous behavior. Anode limited Li/SOCl2 cells, but not Li limited, exhibited detonations, all during overdischarges at relatively low current densities of or = 1 mA/sq cm 2. Anode potentials 4v with large oscillations preceeded the events. The events were confined to the anode and the temperature rose high enough to melt Ni grids.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 47-59
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  • 29
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    Primary lithium batteries, some consumer considerations (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: In order to determine whether larger size lithium batteries would be commercially marketable, the performance of several D size lithium batteries was compared with that of an equivalent alkaline manganese battery, and the relative costs of the different systems were compared. It is concluded that opportunities exist in the consumer market for the larger sizes of the low rate and moderate rate lithium batteries, and that the high rate lithium batteries need further improvements before they can be recommended for consumer applications.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 35-45
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  • 30
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    Hazardous behavior of lithium batteries. Case histories (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: Case histories were described of hazardous behavior for three different cell sizes ranging in nominal capacity from 300 mAh to 12,000 Ah. Design characteristics and other facts believed to have been responsible for the cell explosions, are presented. Obvious facts are discussed as causes for hazardous behavior of lithium batteries in general and oxyhalide batteries in particular.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 3-14
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  • 31
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    Modeling battery life through changes in voltage fit coefficients (1983)
    In:  CASI
    Details
    Publikationsdatum: 2006-10-01
    Beschreibung: A number of 12 ampere-hour cells, nickel cadmium, were cycled under various conditions of temperature and depth of discharge. Using this data, it was confirmed that a five parameter fit equation could be used to model the data within a few millivolts. Both charge and discharge curves can be fit with accuracies in the range of one or two millivolts. The fit coefficients when plotted versus cycles show definite trends and patterns which can be used in an operational sense to predict battery voltage as a function of temperature and depth of discharge.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Goddard Space Flight Center The 1982 Goddard Space Flight Center Battery Workshop; p 125-163
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  • 32
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    Viscous wing code development: A 3-D viscid-inviscid interactive analysis (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Research Center, Theoretical Aerodynamics Contractors' Workshop, Volume 2; p 607-63
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  • 33
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    Computation of separated flow on airfoils with the Grumfoil code (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Research Center, Theoretical Aerodynamics Contractors' Workshop, Volume 2; p 557-58
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  • 34
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    Analysis of airfoil transitional separation bubbles (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Research Center, Theoretical Aerodynamics Contractors' Workshop, Volume 2; p 539-55
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  • 35
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    Entropy effects and shock fitting in conical supersonic full potential flows (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Research Center, Theoretical Aerodynamics Contractors' Workshop, Volume 2; p 461-49
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  • 36
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    Surface crystallization of a fluoride glass (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Beschreibung: Growth of crystals on the surface of a Zr-Ba-La fluoride glass was observed by optical and scanning electron microscopy. Small, dark crystal nucleated rapidly and grew to a size of about 10 microns; then they stopped growing, and wrinkled regions emerged, covering the entire crystal surface.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: American Ceramic Society, Communications (ISSN 0002-7820); 66; C-132
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  • 37
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    Thermal oxidative degradation reactions of linear perfluoroalkyl ethers (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Thermal and thermal oxidative stability studies were performed on linear perfluoroalkyl ether fluids. The effect on degradation by metal catalysts and degradation inhibitors is reported. The linear perfluoroalkyl ethers are inherently unstable at 316 C in an oxidizing atmosphere. The metal catalysts greatly increased the rate of degradation in oxidizing atmospheres. In the presence of these metals in an oxidizing atmosphere, the degradation inhibitors were highly effective in arresting degradation at 288 C. However, the inhibitors had only limited effectiveness at 316 C. The metals promote degradation by chain scission. Based on elemental analysis and oxygen consumption data, the linear perfluoroalkyl ether fluids have a structural arrangement based on difluoroformyl and tetrafluoroethylene oxide units, with the former predominating. Previously announced in STAR as N82-26468
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: I&EC - Industrial and Engineering Chemistry, Product Research and Development (ISSN 0196-4321); 22; 166-170
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  • 38
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    New cryogenic P-channel metal-oxide-semiconductor field effect transistor (MOSFET) with optimized doping yielding performance superior to the G-118, W-164, and 3N165 at 77 K, 4 K, and 1.8 K (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
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  • 39
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    Fracture mechanics of cellular glass (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The fracture mechanics of cellular glasses (for the structural substrate of mirrored glass for solar concentrator reflecting panels) are discussed. Commercial and developmental cellular glasses were tested and analyzed using standard testing techniques and models developed from linear fracture mechanics. Two models describing the fracture behavior of these materials were developed. Slow crack growth behavior in cellular glass was found to be more complex than that encountered in dense glasses or ceramics. The crack velocity was found to be strongly dependent upon water vapor transport to the tip of the moving crack. The existence of a static fatigue limit was not conclusively established, however, it is speculated that slow crack growth behavior in Region 1 may be slower, by orders of magnitude, than that found in dense glasses. Previously announced in STAR as N82-11209
    Schlagwort(e): NONMETALLIC MATERIALS
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  • 40
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    Modeling of single-event upset in bipolar integrated circuits (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The results of work done on the quantitative characterization of single-event upset (SEU) in bipolar random-access memories (RAMs) have been obtained through computer simulation of SEU in RAM cells that contain circuit models for bipolar transistors. The models include current generators that emulate the charge collected from ion tracks. The computer simulation results are compared with test data obtained from a RAM in a bipolar microprocessor chip. This methodology is applicable to other bipolar integrated circuit constructions in addition to RAM cells.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: IEEE Transactions on Nuclear Science (ISSN 0018-9499); NS-30; 4540-454
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  • 41
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    The damage equivalence of electrons, protons, alphas and gamma rays in rad-hard MOS devices (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: This paper reports on a study of damage equivalence in rad-hard MOS devices with 100,000 rads (SiO2) capability. Damage sensitivities for electrons of 1, 2, 3, 5, and 7 MeV, protons of 1, 3, 7, 22, and 40 MeV, 3.4-MeV alphas, and Co-60 gammas were measured and compared. Results indicated that qualitatively the same charge recombination effects occurred in hard oxide devices for doses of 100,000 rads (SiO2) as in soft oxide parts for doses of 1 to 4 krads (SiO2). Consequently, damage equivalency or non-equivalency depended on radiation type and energy. However, recovery effects, both during and after irradiation, controlled relative damage sensitivity and its dependency on total dose, dose rate, supply bias, gate bias, radiation type, and energy. Correction factors can be derived from these data or from similar tests of other hard oxide type, so as to properly evaluate the combined effects of the total space environment.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: IEEE Transactions on Nuclear Science (ISSN 0018-9499); NS-30; 4363-436
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  • 42
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    Simulated space radiation effects on dielectrics and coatings (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Simulation tests of space radiation have been performed for specific organic and inorganic materials. The test results for fifteen materials exposed to protons and five exposed to electrons are presented.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: IEEE Transactions on Nuclear Science (ISSN 0018-9499); NS-30; 4090-409
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  • 43
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    The effect of annealing on the creep of plasma-sprayed ceramics (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The creep of plasma sprayed ZrO2-8Y2O3 was measured at temperatures from 98 to 1250 C (180 to 220 F), and compared to creep of identical samples after annealing at temperatures from 98 to 1316 C (1800 to 2400 F). Loads and temperatures which produced significant creep of as sprayed ceramics produced no creep after annealing. Previously announced in STAR as N83-24799
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Ceramic Engineering and Science Proceedings (ISSN 0196-6219); 4; 819-827
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  • 44
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    Residual stress in plasma-sprayed ceramic turbine tip and gas-path seal specimens (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The residual stresses in a ceramic sheet material used for turbine blade tip gas path seals, were estimated. These stresses result from the plasma spraying process which leaves the surface of the sheet in tension. To determine the properties of plasma sprayed ZrO2-Y2O3 sheet material, its load deflection characteristics were measured. Estimates of the mechanical properties for sheet materials were found to differ from those reported for plasma sprayed bulk materials. Previously announced in STAR as N83-28380
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Ceramic Engineering and Science Proceedings (ISSN 0196-6219); 4; 802-809
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  • 45
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    Correlation of compressive and shear stress with spalling of plasma-sprayed ceramic materials (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Ceramics on metal substrates for potential use as high temperature seals or other applications are exposed to forces originating from differences in thermal expansion between the ceramic and the metal substrate. This report develops a relationship between the difference in expansion of the ceramic and the substrate, defines conditions under which shear between the ceramic and the substrate occurs, and those under which bending forces are produced in the ceramic. The off-axis effect of compression forces resulting from high temperature plastic flow of the ceramic producing buckling of the ceramic is developed. Shear is associated with the edge or boundary stresses on the component while bending is associated with the distortion of an interior region. Both modes are significant in predicting life of the ceramic. Previously announced in STAR as N83-27016
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Ceramic Engineering and Science Proceedings (ISSN 0196-6219); 4; 810-818
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  • 46
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    An exploratory study of area-efficient vortex flap concepts (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The potential of planform modification and hinge-line relocation to improve the thrust efficiency of vortex flaps was experimentally investigated on a 60-deg cropped delta wing model. Spanwise segmentation of the flap, together with chord-tailoring of the segments, allowed the vortex to be maintained on the outboard flap surfaces to higher angles of attack. In addition, location of the flap hinge aft of and underneath the wing leading edge generated substantial thrust from the vortex suction acting on the leading-edge lower surface. A combination of these beneficial effects allowed the flap/wing area to be reduced from 11.4 percent of the continuous flap to 6.3 percent of segmented flap, essentially without detriment to the incremental lift-to-drag ratio due to flap addition in the lift coefficient range 0.5-0.7 based on the basic wing area.
    Schlagwort(e): AERODYNAMICS
    Materialart: Journal of Aircraft (ISSN 0021-8669); 20; 1062-106
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  • 47
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    Observations and implications of natural laminar flow on practical airplane surfaces (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Previously cited in issue 20, p. 3138, Accession no. A82-40893
    Schlagwort(e): AERODYNAMICS
    Materialart: Journal of Aircraft (ISSN 0021-8669); 20; 993-1006
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  • 48
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    Ultrasonic mixing of epoxy curing agents (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: A new technique for mixing solid curing agents into liquid epoxy resins using ultrasonic energy was developed. This procedure allows standard curing agents such as 4,4 prime-diaminodiphenyl sulfone (4,4 prime-DDS) and its 3,3 prime-isomer, (3,3 prime-DDS) to be mixed without prior melting of the curing agent. It also allows curing agents with very high melt temperatures such as 4,4 prime-diaminodiphenyl sulfone (4,4 prime-DDS) and its 3,3 prime-isomer, (3,3 prime-DDS) to be mixed without prior melting of the curing agent. It also allows curing agents with very high melt temperatures such as 4,4 prime-diaminobenzophenone (4,4 prime-DABP) (242 C) to be mixed without premature curing. Four aromatic diamines were ultrasonically blended into MY-720 epoxy resin. These were 4, 4 prime-DDS; 3,3 prime-DDA; 4, 4 prime-DABP and 3,3 prime-DABP. Unfilled moldings were cast and cured for each system and their physical and mechanical properties compared. Previously announced in STAR as N83-27018
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: SAMPE Quarterly (ISSN 0036-0821); 14; 46-50
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  • 49
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    Hardness of dense beta-Si3N4 (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The effects of small changes in the concentration of an oxygen content densification aid on the room temperature microhardness of hot isostatically pressed and sintered beta-Si3N4 ceramics are studied. The compositions studied were Si3N4 containing 7 wt. pct BeSiN2, a fixed nonoxide densification aid, and 1.9-3.7 wt. pct oxygen as a second, variable densification aid. A proportional relationship between high density and high oxygen content, regardless of heat treatment type, is noted.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Journal of Materials Science Letters (ISSN 0261-8028); 2; 657-659
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  • 50
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    Stability of shock waves attached to wedges and cones (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Previously cited in issue 06, p. 799, Accession no. A82-17876
    Schlagwort(e): AERODYNAMICS
    Materialart: AIAA Journal (ISSN 0001-1452); 21; 1611-161
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  • 51
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    Stability of silica heat shield materials in the Space Shuttle environment (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Sample tiles of Space Shuttle reusable surface insulation (RSI) and fibrous refractory composite insulation (FRCI) have been alternately exposed to simulated mission heating and the Kennedy Space Center launch-pad environment for up to 50 cycles. The two types of tiles were coated with an identical glass composition. The coating on RSI tiles was prone to cracking in the test environment while the same coating on FRCI was not. Absorption of water contaminated with environmental deposits resulted in accelerated devitrification in the RSI tiles. Devitrification in FRCI tiles was significantly less. The rate of environmental degradation of tiles appeared to be dependent on the amount of water absorption.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Ceramic Engineering and Science Proceedings (ISSN 0196-6219); 4; 564-577
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  • 52
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    Surface chemistry, friction, and wear of Ni-Zn and Mn-Zn ferrites in contact with metals (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: X-ray photoelectron and Auger electron spectroscopy analysis were used in sliding friction experiments. These experiments were conducted with hot-pressed polycrystalline Ni-Zn and Mn-Zn ferrites, and single-crystal Mn-Zn ferrite in contact with various transition metals at room temperature in both vacuum and argon. The results indicate that Ni2O3 and Fe3O4 were present on the Ni-Zn ferrite surface in addition to the nominal bulk constituents, while MnO2 and Fe3O4 were present on the Mn-Zn ferrite surface in addition to the nominal bulk constituents. The coefficients of friction for the ferrites in contact with metals were related to the relative chemical activity of these metals. The more active the metal, the higher is the coefficient of friction. The coefficients of friction for the ferrites were correlated with the free energy of formation of the lowest metal oxide. The interfacial bond can be regarded as a chemical bond between the metal atoms and the oxygen anions in the ferrite surfaces. The adsorption of oxygen on clean metal and ferrite does strengthen the metal-ferrite contact and increase the friction. The ferrites exhibit local cracking and fracture with sliding under adhesive conditions. All the metals transferred to the surfaces of the ferrites in sliding. Previously announced in STAR as N83-19901
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Ceramic Engineering and Science Proceedings (ISSN 0196-6219); 4; 674-693
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  • 53
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    Shrinkage of amorphous silica fibers (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: By the application of a new technique, the viscosity of amorphous silica fibers was determined in the 1100-1350 C temperature range. An equation was derived that describes the kinetics of shrinkage of the fibers in terms of their radius, viscosity, and surface tension.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Ceramic Engineering and Science Proceedings (ISSN 0196-6219); 4; 492-501
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  • 54
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    Evaluation of the emission capabilities of Spindt-type field emitting cathodes (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The electron emitting capabilities of Spindt-type field emitting cathodes (FEC) are being studied at the Lewis Research Center, NASA. These cathodes, having 5000 emitting points in a 1 mm diameter, have been shown to be capable of emission current densities of 10 A/sq cm and higher. The purposes of this study are to (1) demonstrate that the cathodes can be processed and used in a tube-type configuration, (2) determine whether, at a sufficiently high current density, the cathode can operate in the space charge mode, and (3) evaluate failure mechanisms in this unique type of electron emitter. FEC's have been tested in a diode configuration, by the use of pulse techniques, up to current densities of 6 A/sq cm and anode potentials of 3000 V. Space charge effects have been observed in the range of 5 A/sq cm as an apparent linear increase of cathode current with anode voltage for a constant emitter-gate potential. Failed cathodes were studied by means of scanning electron microscopy and the major failure modes encountered are attributed to gas evolution, followed by arcing, which destroys either individual emitters or a large segment of the cathode area.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: Applications of Surface Science (ISSN 0378-5963); 16; 277-291
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  • 55
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    Phase distributions in plasma-sprayed zirconia-yttria (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: The distribution of phases in plasma-sprayed zirconia-yttria has been determined over a range of yttria levels from 0 to 26.1 molpct YO(1.5) using room temperature X-ray diffractometry. Pure, plasma-sprayed zirconia is composed almost entirely of the monoclinic phase. At levels of yttria between 4 and 10 percent, a quenched-in tetragonal phase predominates, and at higher levels the cubic phase predominates. The phase distributions are compared with previously reported test lives of thermal barrier coatings formed from these materials. Regions of optimal lives were found to correlate with regions having high amounts of the tetragonal phase, small but nonzero amounts of the monoclinic phase, and little or none of the cubic phase. Possible relationships between phase composition and coating performance are discussed.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: American Ceramic Society Bulletin (ISSN 0002-7812); 62; 1355-135
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  • 56
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    An improved push-pull voltage fed converter using a tapped output-filter inductor (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: A new concept of using a tapped output-filter inductor and an auxiliary commutating diode to reduce the likelihood of transformer core saturation in a push-pull, voltage-fed converter is presented. The linearized circuit model and transfer functions are derived with a hybrid approach using both state-space and circuit averaging. Operation of the new converter - including parasitic effects - is discussed, and a design equation for inductor tap ratio is established. It is predicted and experimentally confirmed that the new converter has more symmetrical transformer core operation, and the potential exits for lower transistor turnon current and reduced transistor voltage stress. These benefits reduce switching loss and enhance transistor reliability.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
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  • 57
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    Development of plane strain fracture toughness test for ceramics using Chevron notched specimens (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Chevron-notched four-point-bend and short-bar specimens have been used to determine the fracture toughness of sintered aluminum oxide and hot-pressed silicon nitride ceramics. The fracture toughness for Si3N4 is found to be essentially independent of the specimen size and chevron notch configuration, with values ranging from 4.6 to 4.9 MNm exp -3/2. In contrast, significant specimen size and notch geometry effects have been observed for Al2O3, with the fracture toughness ranging from 3.1 to 4.7 MNm exp -3/2. These effects are attributed to a rising crack growth resistance curve for the Al2O3 tested.
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  • 58
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    A chimera grid scheme (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: A mesh system composed of multiple overset body-conforming grids is described for adapting finite-difference procedures to complex aircraft configurations. In this so-called 'chimera mesh,' a major grid is generated about a main component of the configuration and overset minor grids are used to resolve all other features. Methods for connecting overset multiple grids and modifications of flow-simulation algorithms are discussed. Computational tests in two dimensions indicate that the use of multiple overset grids can simplify the task of grid generation without an adverse effect on flow-field algorithms and computer code complexity.
    Schlagwort(e): AERODYNAMICS
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  • 59
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    Microstructural characterization of SiC (SCS) filaments (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Microstructural features of SiC('SCS') fibers demonstrating growth properties have been investigated using scanning and transmission electron microscopy. An etchant of fused KOH:KNO3 was developed which adequately brought out previously undetermined features.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: SAMPE Quarterly (ISSN 0036-0821); 14; 39-45
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  • 60
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    Low-noise 115-GHz receiver using superconducting tunnel junctions (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: A 110-118-GHz receiver based on a superconducting quasiparticle tunnel junction mixer is described. The single-sideband noise temperature is as low as 68 + or - 3 K. This is nearly twice the sensitivity of any other receiver at this frequency. The receiver was designed using a low-frequency scale model in conjunction with the quantum mixer theory. A scaled version of the receiver for operation at 46 GHz has a single-sideband noise temperature of 55 K. The factors leading to the success of this design are discussed.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: Applied Physics Letters (ISSN 0003-6951); 43; 786-788
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  • 61
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    Conservative full-potential calculations for axisymmetric, transonic flow (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Previously cited in issue 17, p. 2873, Accession no. A81-38082
    Schlagwort(e): AERODYNAMICS
    Materialart: AIAA Journal (ISSN 0001-1452); 21; 1492-149
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  • 62
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    Study of molecular deformation mechanisms in the glassy state. I - Temperature effect on stress-birefringence and strain-birefringence responses of poly(methyl methacrylate) (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Journal of Polymer Science: Polymer Physics Edition (ISSN 0098-1273); 21; 1647-166
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  • 63
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    New propulsion components for electric vehicles (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Improved component technology is described. This includes electronically commutated permanent magnet motors of both drum and disk configurations, an unconventional brush commutated motor, ac induction motors, various controllers, transmissions and complete systems. One or more of these approaches to electric vehicle propulsion may eventually displace presently used controllers and brush commutated dc motors. Previously announced in STAR as N83-25982
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
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  • 64
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    Electrically conductive black optical paint (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: An electrically conductive flat black paint has been developed for use on the Galileo spacecraft which will orbit Jupiter in the late 1980s. The paint, designed for equipment operating in high-energy radiation fields, has multipurpose functions. Its electrical conductivity keeps differential charging of the spacecraft external surfaces and equipment to a minimum, preventing the buildup of electrostatic fields and arcing. Its flat black aspect minimizes the effects of stray light and unwanted reflectances, when used in optical instruments and on sunshades. Its blackness is suitable, also, for thermal control, when the paint is put on spacecraft surfaces. The paint has good adherence properties, as measured by tape tests, when applied properly to a surface. The electrically conductive paint which was developed has the following characteristics: an electrical resistivity of 5 x 10 to the 7th ohms per square; a visual light total reflectance of approximately 5 percent; an infrared reflectance of 0.13 measured over a spectrum from 10 to the (-5.5) power to 0.001 meter; a solar absorptivity, alpha-s, of 0.93, and a thermal emissivity, epsilon, of 0.87, resulting in an alpha-s/epsilon of 1.07. The formula for making the paint and the process for applying it are described.
    Schlagwort(e): NONMETALLIC MATERIALS
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  • 65
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    Annual Conference on Nuclear and Space Radiation Effects, Gatlinburg, TN, July 18-21, 1983, Proceedings (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Topics discussed include radiation effects in devices; the basic mechanisms of radiation effects in structures and materials; radiation effects in integrated circuits; spacecraft charging and space radiation effects; hardness assurance for devices and systems; and radiation transport, energy deposition and charge collection. Papers are presented on the mechanisms of small instabilities in irradiated MOS transistors, on the radiation effects on oxynitride gate dielectrics, on the discharge characteristics of a simulated solar cell array, and on latchup in CMOS devices from heavy ions. Attention is also given to proton upsets in orbit, to the modeling of single-event upset in bipolar integrated circuits, to high-resolution studies of the electrical breakdown of soil, and to a finite-difference solution of Maxwell's equations in generalized nonorthogonal coordinates.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: (ISSN 0018-9499)
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  • 66
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    Single event upset (SEU) of semiconductor devices - A summary of JPL test data (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: The data summarized describe single event upset (bit-flips) for 60 device types having data storage elements. The data are from 15 acceleration tests with both protons and heavier ions. Tables are included summarizing the upset threshold data and listing the devices tested for heavy ion induced bit-flip and the devices tested with protons. With regard to the proton data, it is noted that the data are often limited to one proton energy, since the tests were usually motivated by the engineering requirement of comparing similar candidate devices for a system. It is noted that many of the devices exhibited no upset for the given test conditions (the maximum fluence and the maximum proton energy Ep are given for these cases). It is believed, however, that some possibility of upset usually exists because there is a slight chance that the recoil atom may receive up to 10 to 20 MeV of recoil energy (with more energy at higher Ep).
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: IEEE Transactions on Nuclear Science (ISSN 0018-9499); NS-30; 4520-452
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  • 67
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    Recovery of damage in rad-hard MOS devices during and after irradiation by electrons, protons, alphas, and gamma rays (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: This paper reports on the recovery properties of rad-hard MOS devices during and after irradiation by electrons, protons, alphas, and gamma rays. The results indicated that complex recovery properties controlled the damage sensitivities of the tested parts. The results also indicated that damage sensitivities depended on dose rate, total dose, supply bias, gate bias, transistor type, radiation source, and particle energy. The complex nature of these dependencies make interpretation of LSI device performance in space (exposure to entire electron and proton spectra) difficult, if not impossible, without respective ground tests and analyses. Complete recovery of n-channel shifts was observed, in some cases within hours after irradiation, with equilibrium values of threshold voltages greater than their pre-irradiation values. This effect depended on total dose, radiation source, and gate bias during exposure. In contrast, the p-channel shifts recovered only 20 percent within 30 days after irradiation.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: IEEE Transactions on Nuclear Science (ISSN 0018-9499); NS-30; 4157-416
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  • 68
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    Characteristics of Si3N4-SiO2-Ce2O3 compositions sintered in high-pressure nitrogen (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Full-density Si3N4-SiO2-Ce2O3 compositions were prepared by sintering with 2.5 MPa nitrogen pressure at temperatures of 1900 and 2090 C. Room-temperature flexural strengths near 700 MPa for sintered material compared favorably with the strength of hot-pressed material. At 1370 C, where flexural strengths as high as 363 MPa were obtained, it was observed that the coarsest structure was the strongest and the finest structure was the weakest. One of the compositions tested, Si3N4-8.7 wt pct SiO2-8.3 wt pct-Ce2O3, was found to have excellent 200-h oxidation resistance at 700, 1000, and 1370 C, without incidence of 700 to 1000 C phase instability and cracking.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: American Ceramic Society, Journal (ISSN 0002-7820); 66; 835-841
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  • 69
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    Distributed control of large space antennas (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: A systematic way to choose control design parameters and to evaluate performance for large space antennas is presented. The structural dynamics and control properties for a Hoop and Column Antenna and a Wrap-Rib Antenna are characterized. Some results of the effects of model parameter uncertainties to the stability, surface accuracy, and pointing errors are presented. Critical dynamics and control problems for these antenna configurations are identified and potential solutions are discussed. It was concluded that structural uncertainties and model error can cause serious performance deterioration and can even destabilize the controllers. For the hoop and column antenna, large hoop and long meat and the lack of stiffness between the two substructures result in low structural frequencies. Performance can be improved if this design can be strengthened. The two-site control system is more robust than either single-site control systems for the hoop and column antenna.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: Proc. of the Workshop on Appl. of Distributed System Theory to the Control of Large Space Struct.; p 225-247
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  • 70
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    Semiconductor optoelectronic devices for free-space optical communications (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: The properties of individual injection lasers are reviewed, and devices of greater complexity are described. These either include or are relevant to monolithic integration configurations of the lasers with their electronic driving circuitry, power combining methods of semiconductor lasers, and electronic methods of steering the radiation patterns of semiconductor lasers and laser arrays. The potential of AlGaAs laser technology for free-space optical communications systems is demonstrated. These solid-state components, which can generate and modulate light, combine the power of a number of sources and perform at least part of the beam pointing functions. Methods are proposed for overcoming the main drawback of semiconductor lasers, that is, their inability to emit the needed amount of optical power in a single-mode operation.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: IEEE Communications Magazine (ISSN 0163-6804); 21; Sept
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  • 71
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    Molecular deformation and stress-strain behavior of poly(bisphenol-A-diphenyl sulfone) (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The strain-birefringence response of poly(bisphenol-A-diphenyl sulfone) is found to be independent of temperature at temperatures below -100 C; at higher temperatures, the response becomes slightly dependent on temperature, with lower birefringence seen at higher temperatures. The stress-strain behavior and the stress-birefringence response both depend on temperature over the entire testing temperature range (-179 C to 150 C) studied; this dependence, however, is not pronounced. The evidence is seen as suggesting that the polymer molecules respond to deformation by undergoing conformational rearrangements; the mode of the molecular deformation remains unchanged for temperatures of -100 C or lower. At higher temperatures, the average length of the chain segments involved in the rearrangement increases. The stress-strain response is attributed mainly to chain orientation. The entropic contribution deriving from chain orientation at temperatures below -100 C is still substantial. The modest temperature dependence of the stress-strain response suggests that the energy barriers for the chain segments involved in the rearrangement are relatively low.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Journal of Applied Physics (ISSN 0021-8979); 54; Oct. 198
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  • 72
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    Photothermal degradation of ethylene/vinylacetate copolymer (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Photothermal degradation studies were conducted on a 'stabilized' formulation of ethylene/vinyl acetate copolymer (EVA) in the temperature range 25-105 C under three different oxygen environments (in open air, with limited access to O2, and in a dark closed stagnant oven). These studies were performed in order to evaluate the utility of EVA as an encapsulation material for photovoltaic modules. Results showed that at low temperature (25 C), slow photooxidation of the polymer occurred via electronic energy transfer involving the UV absorber incorporated in the polymer. However, no changes in the physical properties of the bulk polymer were detected up to 1500 hours of irradiation. At elevated temperatures, leaching and evaporation of the additives occurred, which ultimately resulted in the chemical crosslinking of the copolymer and the formation of volatile photoproducts such as acetic acid.
    Schlagwort(e): NONMETALLIC MATERIALS
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  • 73
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    The structure of boron in boron fibres (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: The structure of noncrystalline, chemically vapour-deposited boron fibres was investigated by computer modelling the experimentally obtained X-ray diffraction patterns. The diffraction patterns from the models were computed using the Debye scattering equation. The modelling was done utilizing the minimum nearest-neighbour distance, the density of the model, and the broadening and relative intensity of the various peaks as boundary conditions. The results suggest that the fibres consist of a continuous network of randomly oriented regions of local atomic order, about 2 nm in diameter, containing boron atoms arranged in icosahedra. Approximately half of these regions have a tetragonal structure and the remaining half a distorted rhombohedral structure. The model also indicates the presence of many partial icosahedra and loose atoms not associated with any icosahedra. The partial icosahedra and loose atoms indicated in the present model are in agreement with the relaxing sub-units which have been suggested to explain the anelastic behavior of fibre boron and the loosely bound boron atoms which have been postulated to explain the strengthening mechanism in boron fibres during thermal treatment.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Journal of Materials Science (ISSN 0022-2461); 18; Sept
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  • 74
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    Injection slot location for boundary-layer control in shock-induced separation (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Previously cited in issue 18, p. 726, Accession no. A78-41866
    Schlagwort(e): AERODYNAMICS
    Materialart: (ISSN 0021-8669)
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  • 75
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    Lower-curing-temperature PMR polyimides (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Partial substitution of a p-aminostyrene end-cap for the monomethyl ester of 5-norbornene-2, 3-dicarboxylic acid lowered the final cure temperature of typical PMR resins from 600 F to 500 F. The weight loss characteristics of neat resins and graphite fiber composites prepared by using the mixed end-cap approach were determined at 600 F. The room temperature and short-time elevated temperature mechanical properties of the composites at 550 F and 600 F were determined. The mechanical property retention characteristics of the composites at 550 F and 600 F are discussed. Previously announced in STAR as N83-10118
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Polymer Composites (ISSN 0272-8397); 4; July 198
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  • 76
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    Dynamic fatigue of a machinable glass-ceramic (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: To assess the stress-corrosion susceptibility of a machinable glass-ceramic, its dynamic fatigue behavior was investigated by measuring its strength as a function of stress rate. Fracture mechanics techniques were used to analyze the results for the purpose of making lifetime predictions for components of this material. This material was concluded to have only moderate resistance (N = 30) to stress corrosion in ambient conditions. The effects of specimen size on strength were assessed for the material used in this study; it was concluded that the Weibull edge-flaw scaling law adequately describes the observed strength-size relation.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: (ISSN 0002-7820)
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  • 77
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    Experimental determination of vapor species from laser-ablated carbon phenolic composites (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Previosuly cited in issue 17, p. 2910, Accession no. A81-39069
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: (ISSN 0001-1452)
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  • 78
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    A 20-GHz IMPATT transmitter, summary (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: A three stage IMPATT diode amplifier capable of a 16 W CW output and a 2 dB bandwidth of 117 MHz was developed. On the component side, high performance circulators with a 0.2 dB insertion loss and bandwidth of 5 GHz were fabricated. State of the art GaAs IMPATT diodes incorporating diamond heat sink and double Read doping profile were also developed. The diodes are capable of a 2.5 W CW output. A few diodes achieved power outputs as high as 3 W. On the circuit side, high gain (up to 12 dB per stage) single diode, multituned circuits capable of 2 GHz and 930 MHx bandwidth were developed as the first and second stages, respectively, of the amplifier. A 12 diode waveguide cavity combiner was developed as the output stage. The output stage utilized commercially available single drift GaAs IMPATT diodes.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: A 20-GHz IMPATT Tansmitter 1; 126 p
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  • 79
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    Surface analyses of carbon fibers produced from polyacrylonitrile fibers at low carbonization temperatures (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: A process for producing carbon fibers from polyacrylonitrile at low carbonization temperatures was studied. The bulk and surface properties of fibers obtained after reaction with benzoic acid, air and carbonizing in nitrogen or a dilute acetylene atmosphere are discussed. All fiber products had different surface and internal compositions. Samples produced at temperatures up to 950 C and carbonized in nitrogen contained substantial quantities of nitrogen and oxygen at the surface. During carbonization, the surface nitrogen converted into two new forms, possibly nitrile and an azo or a new carbon-nitrogen bond. Samples carbonized in acetylene contained a carbon-rich surface stable to oxidation.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Textile Research Journal (ISSN 0040-5175); 53; July 198
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  • 80
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    Cavitation erosion characteristics of poly(methyl methacrylate) in a rotating disk device (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The cavitation erosion behavior including the initiation, dynamics and mechanism of damage process on perspex and epoxy resin specimens tested in a rotating disk device were discussed with respect to exposure time. The inception of erosion always took place at the location nearest to the center of rotation of the disk. Subsequently, as exposure time increased, erosion initiated at other locations as well. Light optical photographs and scanning electron micrographs clearly indicate that most of the material loss appears to occur form the networks of cracks due to their interaction and pits indicate particle debris. The optical degradation (loss of transmittance) on perspex was observed to be more on the rear side than on the front side. Previously announced in STAR as N83-11329
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: (ISSN 0043-1648)
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  • 81
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    Comprehensive missile aerodynamics programs for preliminary design (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Previously cited in issue 12, p. 1851, Accession no. A82-27106
    Schlagwort(e): AERODYNAMICS
    Materialart: (ISSN 0022-4560)
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  • 82
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    Equivalent angle-of-attack method for estimating nonlinear aerodynamics of missile fins (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Previously cited in issue 19, p. 2971, Accession no. A82-39113
    Schlagwort(e): AERODYNAMICS
    Materialart: (ISSN 0022-4560)
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  • 83
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    Aerodynamics of wraparound fins (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Previously cited in issue 07, p. 863, Accession no. A83-21011
    Schlagwort(e): AERODYNAMICS
    Materialart: (ISSN 0022-4560)
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  • 84
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    Numerical calculation of nonlinear aerodynamics of wing-body configurations (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Previously cited in issue 07, p. 864, Accession no. A83-21022
    Schlagwort(e): AERODYNAMICS
    Materialart: (ISSN 0001-1452)
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  • 85
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    Radiation effects on MOS devices - dosimetry, annealing, irradiation sequence, and sources (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: This paper reports on some investigations of dosimetry, annealing, irradiation sequences, and radioactive sources, involved in the determination of radiation effects on MOS devices. Results show that agreement in the experimental and theoretical surface to average doses support the use of thermo-luminescent dosimeters (manganese activated calcium fluoride) in specifying the surface dose delivered to thin gate insulators of MOS devices. Annealing measurements indicate the existence of at least two energy levels,,s or a activation energies, for recovery of soft oxide MOS devices after irradiation by electrons, protons, and gammas. Damage sensitivities of MOS devices were found to be independent of combinations and sequences of radiation type or energies. Comparison of various gamma sources indicated a small dependence of damage sensitivity on the Cobalt facility, but a more significant dependence in the case of the Cesium source. These results were attributed to differences in the spectral content of the several sources.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: IEEE Transactions on Nuclear Science (ISSN 0018-9499); NS-30; June 198
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  • 86
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    Benchmark determination of Shuttle Orbiter entry aerodynamic heat-transfer data (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Previously cited in issue 07, p. 965, Accession no. A82-19777
    Schlagwort(e): AERODYNAMICS
    Materialart: (ISSN 0022-4560)
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  • 87
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    Tubes in space - Very much alive (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Some advantages of TWTs over SSDs are discussed. Wideband TWTs have been developed which can produce 20 W of RF power at 20 GHz with 40 percent efficiency, a figure three or four times that available from SSDs such as FETs. The basic performance of TWTs exceeds that of SSDs for any given bandwidth and frequency. SSDs are transit time limited, and their performance deteriorates fundamentally as the reciprocal of the square of the operating frequency. Power limits for SSDs have been reached or are quickly being approached. Free electron devices such as tubes have an efficiency advantage because electrons in the vacuum travel faster than bulk charges in SSDs. Combined SSD devices are prone to burnout and incur penalties due to the need to dissipate heat. TWTs have a 6.7:1 advantage in radiator area ratio. Recent progress in TWT technology has produced a tenfold increase in CW output power, doubled to quadrupled the efficiency, and pushed frequency ranges into the terahertz region, orders of magnitude beyond the SSD cutoff.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: Microwaves & RF; 22; Mar. 198
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  • 88
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    Computation of high Reynolds number internal/external flows (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: (Previously cited in issue 17, p. 2878, Accession no. A81-39001)
    Schlagwort(e): AERODYNAMICS
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  • 89
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    Ultrahigh Molecular Weight Aromatic Siloxane Polymers (1983)
    In:  CASI
    Details
    Publikationsdatum: 2014-09-11
    Beschreibung: Silphenylene-siloxane polymers can be prepared by a condensation reaction of a diol 1,4-bis(hydroxydimethylsilyl)benzene and a silane bis(dimethylamino)dimethylsilane. Using a stepwise condensation technique, a polymer (R=CH3) with a molecular weight in excess of 1.0 x 1 million has been produced. The polymer exhibits increased thermal stability, compared to a methyl siloxane polymer without the aromatic phenyl ring in the backbone. The use of bis(dimethylamino)methylvinylsilane should allow for ready crosslinking at the vinyl sites (R=-CH=CH2) introduced into the backbone. However, under the conditions of the reaction system a high molecular weight polymer was not obtained or the polymer underwent a crosslinking process during the synthesis.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Alabama Univ. Res. Rept.: 1983 NASA(ASEE Summer Faculty Fellowship Program; 13 p
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    Receivers (1983)
    In:  CASI
    Details
    Publikationsdatum: 2014-09-11
    Beschreibung: Before discussing Deep Space Network receivers, a brief description of the functions of receivers and how they interface with other elements of the Network is presented. Different types of receivers are used in the Network for various purposes. The principal receiver type is used for telemetry and tracking. This receiver provides the capability, with other elements of the Network, to track the space probe utilizing Doppler and range measurements, and to receive telemetry, including both scientific data from the onboard experiments and engineering data pertaining to the health of the probe. Another type of receiver is used for radio science applications. This receiver measures phase perturbations on the carrier signal to obtain information on the composition of solar and planetary atmospheres and interplanetary space. A third type of receiver utilizes very long baseline interferometry (VLBI) techniques for both radio science and spacecraft navigation data. Only the telemetry receiver is described in detail in this document. The integration of the Receiver-Exciter subsystem with other portions of the Deep Space Network is described.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: The Deep Space Network: A Radio Commun. Instr. for Deep Space Exploration; 26 p
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    Low Noise Amplifiers (1983)
    In:  CASI
    Details
    Publikationsdatum: 2014-09-11
    Beschreibung: One of the great technical challenges facing the Deep Space Network is receiving signals from a severely weight limited spacecraft hundreds of thousands to billions of kilometers from Earth. This weight limitation has always imposed strict limitations on the size of the spacecraft antenna and the amount of transmitter power radiated. The communication burden is placed upon the ground systems of the Deep Space Network which must recover an extremely weak signal in the presence of nearly overwhelming amounts of noise. Two key parameters that determine the signal to noise ratio of a received signal using a deep space station are the collecting area and efficiency of the antenna, and the amount of noise which is generated in, as well as allowed to enter in, the antenna-mounted receiver. These parameters are used to describe the relative ability of a deep space station to receive weak signals. As spacecraft to Earth communication distances have increased, the Deep Space Network engages in a relentless effort to increase the figure of merit through larger and more efficient antennas, higher frequencies, and lower system noise temperature.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: The Deep Space Network: A Radio Commun. Instr. for Deep Space Exploration; 32 p
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    SAR Speckle Noise Reduction Using Wiener Filter (1983)
    In:  CASI
    Details
    Publikationsdatum: 2014-09-10
    Beschreibung: Synthetic aperture radar (SAR) images are degraded by speckle. A multiplicative speckle noise model for SAR images is presented. Using this model, a Wiener filter is derived by minimizing the mean-squared error using the known speckle statistics. Implementation of the Wiener filter is discussed and experimental results are presented. Finally, possible improvements to this method are explored.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: Texas A and M Univ. Proc. of the NASA Symp. on Math. Pattern Recognition and Image Analysis; p 295-310
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    Approximation to the Probability Density at the Output of a Photmultiplier Tube (1983)
    In:  CASI
    Details
    Publikationsdatum: 2014-09-10
    Beschreibung: The probability density of the integrated output of a photomultiplier tube (PMT) is approximated by the Gaussian, Rayleigh, and Gamma probability densities. The accuracy of the approximations depends on the signal energy alpha: the Gamma distribution is accurate for all alpha, the Raleigh distribution is accurate for small alpha (approximate or less than 1 photon) and the Gaussian distribution is accurate for large alpha (approximate or greater than 10 photons).
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: The Telecommun. and Data Acquisition Rept.; p 36-39
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    Comparison of subsonic/transonic aftbody flow prediction methods (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: (Previously cited in issue 21, p. 3614, Accession no. A81-44900)
    Schlagwort(e): AERODYNAMICS
    Format: text
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  • 95
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    Linear/nonlinear behavior in unsteady transonic aerodynamics (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: (Previously cited in issue 12, p. 1923, Accession no. A81-29496)
    Schlagwort(e): AERODYNAMICS
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  • 96
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    Effects of spanwise blowing and reverse thrust on fighter low-speed aerodynamics (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: (Previously cited in issue 07, p. 963, Accession no. A82-19203)
    Schlagwort(e): AERODYNAMICS
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  • 97
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    Computation of nonequilibrium, supersonic three-dimensional inviscid flow over blunt-nosed bodies (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: Previously cited in issue 15, p. 2120, Accession no. A75-33931
    Schlagwort(e): AERODYNAMICS
    Materialart: (ISSN 0001-1452)
    Format: text
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  • 98
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    Separated trailing-edge flow at a transonic Mach number (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: Previously cited in issue 06, p. 800, Accession no. A82-17899
    Schlagwort(e): AERODYNAMICS
    Materialart: (ISSN 0001-1452)
    Format: text
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    Unsteady transonic small disturbance approximation with strong shock waves (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: Previously cited in issue 06, p. 797, Accession no. A82-17812
    Schlagwort(e): AERODYNAMICS
    Materialart: (ISSN 0001-1452)
    Format: text
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    Grid generation in three dimensions by Poisson equations with control of cell size and skewness at boundary surfaces (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: An algorithm for generating computational grids about arbitrary three-dimensional bodies is developed. The elliptic partial differential equation (PDE) approach developed by Steger and Sorenson and used in the NASA computer program GRAPE is extended from two to three dimensions. Forcing functions which are found automatically by the algorithm give the user the ability to control mesh cell size and skewness at boundary surfaces. This algorithm, as is typical of PDE grid generators, gives smooth grid lines and spacing in the interior of the grid. The method is applied to a rectilinear wind-tunnel case and to two body shapes in spherical coordinates.
    Schlagwort(e): AERODYNAMICS
    Format: text
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