177
177
Jun 11, 2011
06/11
by
Oreopoulos, Lazaros; Cahalan, Robert F
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Two full months (July 2003 and January 2004) of MODIS Atmosphere Level-3 data from the Terra and Aqua satellites are analyzed in order to characterize the horizontal variability of cloud optical thickness and water path at global scales. Various options to derive cloud variability parameters are discussed. The climatology of cloud inhomogeneity is built by first calculating daily parameter values at spatial scales of l degree x 1 degree, and then at zonal and global scales, followed by...
Topics: NUCLEAR ELECTRIC PROPULSION, SPACECRAFT PROPULSION, SPACECRAFT DESIGN, DESIGN OPTIMIZATION, GENETIC...
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279
May 31, 2011
05/11
by
Qian, Jian-Hua; Tao, Wei-Kuo; Lau, K.-M
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A case of torrential precipitation process in the Mei-yu front, an Asian monsoon system east to the Tibetan Plateau, is studied with the coupled Penn State University/NCAR MM5 and NASA/GSFC PLACE (Parameterization for Land - Atmosphere - Cloud Exchange) models. Remote and local impacts of water vapor on the location and intensity of Mei-yu precipitation are studied by numerical experiments. Results demonstrate that the water vapor source for this heavy precipitation case in Yangtze river basin...
Topics: REACTOR TECHNOLOGY, NUCLEAR ELECTRIC PROPULSION, MOLTEN SALTS, POWER REACTORS, LIQUID METALS, HEAT...
453
453
Jun 1, 2011
06/11
by
Koroteev, Anatoly S.; Dickens, Ricky, et al; Ponomarev-Stepnoi, Nicolai N.; Smetannikov, Vladimir P.; Gafarov, Albert A.; Houts, Mike; VanDyke, Melissa; Godfroy, Tom; Martin, James; Bragg-Sitton, Shannon
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Fission technology can enable rapid, affordable access to any point in the solar system. If fission propulsion systems are to be developed to their full potential; however, near-term customers must be identified and initial fission systems successfully developed, launched, and utilized. Successful utilization will simultaneously develop the infrastructure and experience necessary for developing even higher power and performance systems. To be successful, development programs must devise...
Topics: NUCLEAR FISSION, THERMAL ENERGY, ROCKET ENGINES, NUCLEAR ELECTRIC PROPULSION, HEAT SOURCES, SPACE...
Thermophotovoltaic energy conversion offers a means of efficiently converting heat into electrical power. This has potential benefits for space nuclear reactor power systems currently in development. The primary obstacle to space operation of thermophotovoltaic devices appears to be the low heat rejection temperatures which necessitate large radiator areas. A study of the tradespace between efficiency and radiator size indicates that feasible multi-junction TPV efficiencies result in...
Topics: Nuclear reactors, Electric power, Space nuclear fission reactor, Thermphotovoltaics,...
The use of high thrust, relatively low specific impulse systems, such as chemical or nuclear thermal propulsion, in conjunction with low thrust, high specific impulse nuclear electric propulsion (NEP) was considered for a representative piloted Mars mission. It was concluded that the single burn option in an all-propulsive mission scenario does not yield a significant advantage in reduced trip time for reasonable masses. The multiple burn option allows significant reductions in trip time...
Topics: NASA Technical Reports Server (NTRS), INTERPLANETARY SPACECRAFT, MANNED MARS MISSIONS, PROPULSION...
The mission benefits of using both high thrust nuclear thermal propulsion (NTP) and low acceleration, high specific impulse nuclear electric propulsion (NEP) to reduce piloted trip times to Mars with reasonable initial mass are assessed. Recent updates in mission design, such as the Earth fly-by return, are assessed for their impact on previous studies. In addition, the Synthesis Commission split mission to Mars in 2014 is also assessed using combined propulsion. Results show an 80 to 100 day...
Topics: NASA Technical Reports Server (NTRS), INTERPLANETARY SPACECRAFT, LOW THRUST PROPULSION, MANNED MARS...
The nuclear electric propulsion (NEP) concept design developed in support of the Space Transfer Concepts and Analysis for Exploration Missions (STCAEM) study is presented. The evolution of the NEP concept is described along with the requirements, guidelines, and assumptions for the design. Operating modes and options are defined and a systems description of the vehicle is presented. Artificial gravity configuration options and space and ground support systems are discussed. Finally, an...
Topics: NASA Technical Reports Server (NTRS), INTERPLANETARY SPACECRAFT, LUNAR SPACECRAFT, NUCLEAR ELECTRIC...
Conceptual designs of the nuclear propulsion programs are reported. Major areas of investigation were (1) design efforts on spacecraft configuration and heat rejection subsystem, (2) high-voltage thermionic reactor concepts, and (3) dual-mode spacecraft configuration study.
Topics: NASA Technical Reports Server (NTRS), NUCLEAR ELECTRIC PROPULSION, SPACECRAFT CONFIGURATIONS,...
An overview of Department of Energy space nuclear propulsion programs is presented in outline and graphic form. DOE's role in the development and safety assurance of space nuclear propulsion is addressed. Testing issues and facilities are discussed along with development needs and recent research activities.
Topics: NASA Technical Reports Server (NTRS), NUCLEAR ELECTRIC PROPULSION, NUCLEAR PROPULSION, SPACECRAFT...
Nuclear power provides an enabling capability for NASA missions that might otherwise be constrained by power availability, mission duration, or operational robustness. NASA and the Department of Energy (DOE) are developing fission power technology to serve a wide range of future space uses. Advantages include lower mass, longer life, and greater mission flexibility than competing power system options. Kilowatt-class fission systems, designated "Kilopower," were conceived to address...
Topics: NASA Technical Reports Server (NTRS), OPERATING TEMPERATURE, RADIOISOTOPE HEAT SOURCES, FISSION...
The Jupiter Icy Moons Orbiter (JIMO) mission is currently under study by the Office of Space Science under the Project Prometheus Program. JIMO is examining the use of Nuclear Electric Propulsion (NEP) to carry scientific payloads to three Jovian moons. A potential power system concept includes dual 100 kWe Brayton converters, a deployable pumped loop heat rejection subsystem, and a 400 Vac Power Management and Distribution (PMAD) bus. Many trades were performed in aniving at this candidate...
Topics: NASA Technical Reports Server (NTRS), NUCLEAR ELECTRIC PROPULSION, ELECTRIC POWER, JUPITER...
Various aspects of nuclear electric propulsion (NEP) systems analysis and modeling are discussed. The following specific topics are covered: (1) systems analysis challenges; (2) goals for NEP systems analysis; (3) the Nuclear Propulsion Office approach; and (4) NEP subsystem model development. The discussion is presented in vugraph form.
Topics: NASA Technical Reports Server (NTRS), NUCLEAR ELECTRIC PROPULSION, SPACECRAFT POWER SUPPLIES,...
The exploration of our solar system will require spacecraft with much greater capability than spacecraft which have been launched in the past. This is particularly true for exploration of the outer planets. Outer planet exploration requires shorter trip times, increased payload mass, and ability to orbit or land on outer planets. Increased capability requires better propulsion systems, including increased specific impulse. Chemical propulsion systems are not capable of delivering the...
Topics: NASA Technical Reports Server (NTRS), SPACE MISSIONS, PROPULSION SYSTEM PERFORMANCE, PROPULSION...
Nuclear electric propulsion (NEP) and planetary surface power missions require reactors that are lightweight, operationally robust, and scalable in power for widely varying scientific mission objectives. Molten salt reactor technology meets all of these requirements and offers an interesting alternative to traditional gas cooled, liquid metal, and heat pipe space reactors.
Topics: NASA Technical Reports Server (NTRS), REACTOR TECHNOLOGY, NUCLEAR ELECTRIC PROPULSION, MOLTEN...
The Safe Affordable Fission Engine (SAFE) test series addresses Phase I Space Fission Systems issues in it particular non-nuclear testing and system integration issues leading to the testing and non-nuclear demonstration of a 400-kW fully integrated flight unit. The first part of the SAFE 30 test series demonstrated operation of the simulated nuclear core and heat pipe system. Experimental data acquired in a number of different test scenarios will validate existing computational models,...
Topics: NASA Technical Reports Server (NTRS), PROPULSION SYSTEM PERFORMANCE, PERFORMANCE TESTS, NUCLEAR...
The following paper documents the mission and systems analysis portion of a study in which Nuclear Electric Propulsion (NEP) is used as the in-space transportation system to send a series of robotic rovers and atmospheric science airplanes to Venus in the 2020 to 2030 timeframe. As part of the NASA RASC (Revolutionary Aerospace Systems Concepts) program, this mission analysis is meant to identify future technologies and their application to far reaching NASA missions. The NEP systems and...
Topics: NASA Technical Reports Server (NTRS), NUCLEAR ELECTRIC PROPULSION, ROBOTICS, SPACE MISSIONS,...
Basic guidelines are presented for a nuclear space power system which utilizes heat pipes to transport thermal power from a fast nuclear reactor to an out of core thermionic converter array. Design parameters are discussed for the nuclear reactor, heat pipes, thermionic converters, shields (neutron and gamma), waste heat rejection systems, and the electrical bus bar-cable system required to transport the high current/low voltage power to the processing equipment. Dimensions are compatible with...
Topics: NASA Technical Reports Server (NTRS), NUCLEAR ELECTRIC PROPULSION, SPACE POWER REACTORS, SPACECRAFT...
Future propulsion and power technologies for deep space missions are profiled in this viewgraph presentation. The presentation includes diagrams illustrating possible future travel times to other planets in the solar system. The propulsion technologies researched at Marshall Space Flight Center (MSFC) include: 1) Chemical Propulsion; 2) Nuclear Propulsion; 3) Electric and Plasma Propulsion; 4) Energetics. The presentation contains additional information about these technologies, as well as...
Topics: NASA Technical Reports Server (NTRS), RESEARCH AND DEVELOPMENT, SPACECRAFT PROPULSION, NUCLEAR...
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184
Sep 20, 2010
09/10
by
Workman, Gary L
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This report covers the activities performed in the Drop Tube Study which The University of Alabama in Huntsville designed, fabricated and performed various low gravity experiments in materials processing from November 1, 1991 through October 30, 1992. During the performance of this contract the utilization of these ground-based containerless processing facilities has been instrumental in providing the opportunity to determine the feasibility of performing a number of solidification experiments...
Topics: BRAYTON CYCLE, NUCLEAR ELECTRIC PROPULSION, NUCLEAR FUELS, REACTOR DESIGN, REACTOR TECHNOLOGY,...
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324
May 22, 2011
05/11
by
NON
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The present invention provides a fixture for supporting an elongated specimen for crush testing. The fixture comprises a base plate, four guiding rods, a sliding plate, four support rods and two collars. The guiding rods connect to the base plate and extend in a direction substantially perpendicular to the base plate. The sliding plate has linear bearings which encircle the guiding rods and enable translation of the sliding plate along the axis of each guiding rod. The four supporting rods...
Topics: NUCLEAR ELECTRIC PROPULSION, PROTONS, SPACECRAFT DESIGN, SPACECREWS, NUCLEAR ROCKET ENGINES,...
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223
May 31, 2011
05/11
by
Haberle, R. M.; Hollingsworth, J. L.; Colaprete, A.; Bridger, A. F. C.; McKay, C. P.; Murphy, J. R.; Schaeffer, J.; Freedman, R
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For many years, the NASA/Ames Mars General Circulation Model (GCM) has been built around the UCLA B-grid dynamical core. An attached tracer transport scheme based on the aerosol microphysical model of Toon et al. (1988) provided a tool for studying dust storm transport and feedbacks (Murphy et al., 1995). While we still use a B-grid version of the model, the Ames group is now transitioning to the ARIES/GEOS Goddard C-grid dynamical core (Suarez and Takacs, 1995). The C-grid produces smoother...
Topics: BRAYTON CYCLE, POWER CONVERTERS, NUCLEAR ELECTRIC PROPULSION, ENERGY CONVERSION EFFICIENCY, NUCLEAR...
389
389
Jun 1, 2011
06/11
by
Valerio, Matthew D.; Romanofsky, Robert R.; VanKeuls, Fred W
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We developed an automated measurement system using a PC running a LabView application, a Velmex BiSlide X-Y positioner, and a HP85l0C network analyzer. The system provides high positioning accuracy and requires no user supervision. After the user inputs the necessary parameters into the LabView application, LabView controls the motor positioning and performs the data acquisition. Current parameters and measured data are shown on the PC display in two 3-D graphs and updated after every data...
Topics: GAS COOLED REACTORS, NICKEL ALLOYS, THERMAL SIMULATION, SPACECRAFT PROPULSION, BRAYTON CYCLE, GAS...
386
386
Jul 11, 2010
07/10
by
PLATZ, R
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SOME EARLY ATTEMPTS TO CONSTRUCT SAIL PLANES ARE REPORTED. THE AUTHORS ARE EXAMINING SOME NEW DESIGNS AND NEW CONCEPTS FOR THE FLIGHT CONTROL OF SUCH CRAFT. THEY NOTE THAT THE PROSPECTS FOR THE CONSTRUCTION OF A LIGHT WEIGHT, DURABLE, EASILY DISASSEMBLED PLANE OF THIS TYPE ARE GOOD.
Topics: COMETS, NUCLEAR ELECTRIC PROPULSION, SPACE EXPLORATION, ION ENGINES, SPACECRAFT DESIGN
366
366
Jun 12, 2011
06/11
by
Lawson, Anthony L.; Parthasarathy, Ramkumar N
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It has been observed in previous experimental studies that round helium jets injected into air display a repetitive structure for a long distance, somewhat similar to the buoyancy-induced flickering observed in diffusion flames. In order to investigate the influence of gravity on the near-injector development of the flow, a linear temporal stability analysis of a round helium jet injected into air was performed. The flow was assumed to be isothermal and locally parallel; viscous and diffusive...
Topics: ELECTRIC PROPULSION, NUCLEAR ELECTRIC PROPULSION, CHEMICAL PROPULSION, SOLAR GENERATORS, NUCLEAR...
The Safe Affordable Fission Engine (SAFE) test series addresses Phase 1 Space Fission Systems issues in particular non-nuclear testing and system integration issues leading to the testing and non-nuclear demonstration of a 400-kW fully integrated flight unit. The first part of the SAFE 30 test series demonstrated operation of the simulated nuclear core and heat pipe system. Experimental data acquired in a number of different test scenarios will validate existing computational models,...
Topics: NASA Technical Reports Server (NTRS), END-TO-END DATA SYSTEMS, FISSION, ION ENGINES, MATHEMATICAL...
Practical implementation of the proposed Jupiter Icy Moon Orbiter (JIMO) mission, which would require a total delta V of approximately 38 km/s, will require the development of a high power, high specific impulse propulsion system. Initial analyses show that high power gridded ion thrusters could satisfy JIMO mission requirements. A NASA GRC-led team is developing a large area, high specific impulse, nominally 25 kW ion thruster to satisfy both the performance and the lifetime requirements for...
Topics: NASA Technical Reports Server (NTRS), NUCLEAR ELECTRIC PROPULSION, ION ENGINES, SPECIFIC IMPULSE,...
The Jupiter Icy Moons Orbiter (JIMO) is a bold new mission being developed by NASA's Office of Space Science under Project Prometheus. JIMO is examining the potential of nuclear electric propulsion (NEP) technology to efficiently deliver scientific payloads to three of Jupiter's moons: Callisto, Ganymede, and Europa. A critical element of the NEP spacecraft is the space reactor power system (SRPS), consisting of the nuclear reactor, power conversion, heat rejection, and power management and...
Topics: NASA Technical Reports Server (NTRS), GANYMEDE, ICE, JUPITER (PLANET), SOLAR CELLS, SOLAR...
The critical evaluation and subsequent redesign of the power conversion subsystem of the spacecraft are covered. As part of that evaluation and redesign, prototype heat pipe components for the heat rejection system were designed fabricated and tested. Based on the results of these tests in conjunction with changing mission requirements and changing energy conversion devices, new system designs were investigated. The initial evaluation and redesign was based on state-of-the-art fabrication and...
Topics: NASA Technical Reports Server (NTRS), FABRICATION, HEAT PIPES, HEAT RADIATORS, NUCLEAR ELECTRIC...
The following topics are presented: background; Global Positioning System (GPS) methodology overview; the graphical user interface (GUI); current models; application to space nuclear power/propulsion; and interfacing requirements. The discussion is presented in vugraph form.
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, GLOBAL POSITIONING SYSTEM, NUCLEAR...
Engineers at Los Alamos National Laboratory (LANL) have designed several heat pipe cooled reactor concepts, ranging in power from 15 kWt to 800 kWt, for both surface power systems and nuclear electric propulsion systems. The Safe, Affordable Fission Engine (SAFE) is now being developed in a collaborative effort between LANL and NASA Marshall Space Flight Center (NASA/MSFC). NASA is responsible for fabrication and testing of non-nuclear, electrically heated modules in the Early Flight Fission...
Topics: NASA Technical Reports Server (NTRS), FISSION, HEAT PIPES, APPROXIMATION, TRANSIENT HEATING,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), MANNED MARS MISSIONS, MARS EXPLORATION, DELTA LAUNCH VEHICLE,...
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349
Jul 23, 2010
07/10
by
Simons, Rainee N.; Bhasin, Kul. B
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Direct current and also the microwave characteristics of optically illuminated AlGaAs/GaAs HEMT are experimentally measured for the first time and compared with that of GaAs MESFET. The results showed that the average increase in the gain is 2.89 dB under 1.7 nW/sq cm optical intensity at 0.83 microns. Further, the effect of illumination on S-parameters is more pronounced when the devices are biased close to pinch off. Novel applications of optically illuminated HEMT as a variable gain...
Topics: CHEMICAL PROPULSION, ORBIT CALCULATION, EXHAUST VELOCITY, ION PROPULSION, MANNED SPACE FLIGHT,...
441
441
Sep 20, 2010
09/10
by
Fricke, Robert W
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The STS-43 Space Shuttle Program Mission Report contains a summary of the vehicle subsystem operations during the forty-second flight of the Space Shuttle Program and the ninth flight of the Orbiter Vehicle Atlantis (OV-104). In addition to the Atlantis vehicle, the flight vehicle consisted of the following: an External Tank (ET) designated as ET-47 (LWT-40); three Space Shuttle main engines (SSME's) (serial numbers 2024, 2012, and 2028 in positions 1, 2, and 3, respectively); and two Solid...
Topics: NUCLEAR ELECTRIC PROPULSION, RADIATION PROTECTION, SPACE EXPLORATION, SPACECREWS, SYSTEMS HEALTH...
Five viewgraphs are presented that outline the objectives and elements of the Nuclear Propulsion Program, mission considerations, propulsion technologies, and the logic flow path for nuclear propulsion development.
Topics: NASA Technical Reports Server (NTRS), NUCLEAR ELECTRIC PROPULSION, NUCLEAR PROPULSION, SPACECRAFT...
The objective of this study was to establish the initial quantitative reliability bounds for nuclear electric propulsion systems in a manned Mars mission required to ensure crew safety and mission success. Finding the reliability bounds involves balancing top-down (mission driven) requirements and bottom-up (technology driven) capabilities. In seeking this balance we hope to accomplish the following: (1) provide design insights into the achievability of the baseline design in terms of...
Topics: NASA Technical Reports Server (NTRS), MISSION PLANNING, NUCLEAR ELECTRIC PROPULSION, RELIABILITY,...
The topics are presented in viewgraph form and include the following: initial study groundrules; power system groundrules/assumptions; power technologies assessment; prototype SP-100 system specific mass; custom SP-100 system specific mass; radiator packaging limits; Brayton system specific mass and radiator area; thermoelectric specific mass and radiator area; specific mass for prototype vs. custom SP-100-based systems; system packaging limits on power level (kWe); and a conceptual nuclear...
Topics: NASA Technical Reports Server (NTRS), BRAYTON CYCLE, MISSION PLANNING, NUCLEAR ELECTRIC PROPULSION,...
A new nuclear electric propulsion (NEP) systems analysis code is discussed. The new code is modular and consists of a driver code and various subsystem models. The code models five different subsystems: (1) reactor/shield; (2) power conversion; (3) heat rejection; (4) power management and distribution (PMAD); and (5) thrusters. The code optimizes for the following design criteria: minimum mass; minimum radiator area; and low mass/low area. The code also optimizes the following parameters:...
Topics: NASA Technical Reports Server (NTRS), APPLICATIONS PROGRAMS (COMPUTERS), DESIGN ANALYSIS, NUCLEAR...
The Propulsion Systems Panel was established because of the specialized nature of many of the materials and structures technology issues related to propulsion systems. This panel was co-chaired by Carmelo Bianca, MSFC, and Bob Miner, LeRC. Because of the diverse range of missions anticipated for the Space Transportation program, three distinct propulsion system types were identified in the workshop planning process: liquid propulsion systems, solid propulsion systems and nuclear...
Topics: NASA Technical Reports Server (NTRS), MISSION PLANNING, PROPULSION, PROPULSION SYSTEM...
The topics are presented in viewgraph form and include the following: the Electric Propulsion Research Building (no. 16) the Electric Power Laboratory (BLDG. 301); the Tank 6 Vacuum Facility; and test facilities for electric propulsion and LeRC.
Topics: NASA Technical Reports Server (NTRS), ENGINE TESTS, NASA PROGRAMS, NUCLEAR ELECTRIC PROPULSION,...
Nuclear electric propulsion (NEP) offers significant benefits to missions for outer planet exploration. Reaching outer planet destinations, especially beyond Jupiter, is a struggle against time and distance. For relatively near missions, such as a Europa lander, conventional chemical propulsion and NEP offer similar performance and capabilities. For challenging missions such as a Pluto orbiter, neither chemical nor solar electric propulsion are capable while NEP offers acceptable performance....
Topics: NASA Technical Reports Server (NTRS), NUCLEAR ELECTRIC PROPULSION, CHEMICAL PROPULSION,...
This presentation provides an overview of NASA Exploration Team's (NEXT) vision of in-space transportation in the future. Hurdles facing in-space transportation include affordable power sources, crew health and safety, optimized robotic and human operations and space systems performance. Topics covered include: exploration of Earth's neighborhood, Earth's neighborhood architecture and elements, Mars mission trajectory options, delta-v variations, Mars mission duration options, Mars mission...
Topics: NASA Technical Reports Server (NTRS), MISSION PLANNING, SPACE EXPLORATION, MARS MISSIONS,...
Evolutionary computational (EC) techniques such as genetic algorithms (GA) have been identified as promising methods to explore the design space of mechanical and electrical systems at the earliest stages of design. In this paper the authors summarize their research in the use of evolutionary computation to develop preliminary designs for various space systems. An evolutionary computational solver developed over the course of the research, X-TOOLSS (Exploration Toolset for the Optimization of...
Topics: NASA Technical Reports Server (NTRS), GENETIC ALGORITHMS, AEROSPACE SYSTEMS, COMPLEX SYSTEMS,...
Laser propulsion can reduce fuel by 57 t to 105 t over chemical propulsion for a 144 t Lunar base, with no significant increase in trip time. Laser propulsion reduces trip time by a factor of 40 to 120 over nuclear electric propulsion and time in radiation belts by a factor of 100 to 1700. Either solar or nuclear driven laser diode arrays could produce multimegawatt beams, typically 3,700 t for a 235 MW laser system. Laser diode arrays have high payoff due to short wavelength (850 nm) and high...
Topics: NASA Technical Reports Server (NTRS), LASER POWER BEAMING, LASER PROPULSION, LUNAR BASES, NUCLEAR...
NASA has initiated a technology program to establish the readiness of nuclear propulsion technology for the Space Exploration Initiative (SEI). This program was initiated with a very modest effort identified with nuclear thermal propulsion (NTP); however, nuclear electric propulsion (NEP) is also an integral part of this program and builds upon NASA's Base Research and Technology Program in power and electric propulsion as well as the SP-100 space nuclear power program. Although the Synthesis...
Topics: NASA Technical Reports Server (NTRS), NUCLEAR ELECTRIC PROPULSION, ROBOTICS, SPACE EXPLORATION,...
Covered here is the second phase of a broad scoped and systematic study of space transfer concepts for human lunar and Mars missions. The study addressed issues that were raised during Phase 1, developed generic Mars missions profile analysis data, and conducted preliminary analysis of the Mars in-space transportation requirements and implementation from the Stafford Committee Synthesis Report.
Topics: NASA Technical Reports Server (NTRS), MARS (PLANET), MARS LANDING, MISSION PLANNING, ORBIT TRANSFER...
The parametrically based closed Brayton cycle (CBC) computer design model was developed for inclusion into the NASA LeRC overall Nuclear Electric Propulsion (NEP) end-to-end systems model. The code is intended to provide greater depth to the NEP system modeling which is required to more accurately predict the impact of specific technology on system performance. The CBC model is parametrically based to allow for conducting detailed optimization studies and to provide for easy integration into an...
Topics: NASA Technical Reports Server (NTRS), BRAYTON CYCLE, CLOSED CYCLES, NUCLEAR ELECTRIC PROPULSION,...
Nuclear power provides an enabling capability for NASA missions that might otherwise be constrained by power availability, mission duration, or operational robustness. NASA and the Department of Energy (DOE) are developing fission power technology to serve a wide range of future space uses. Advantages include lower mass, longer life, and greater mission flexibility than competing power system options. Kilowatt-class fission systems, designated "Kilopower," were conceived to address...
Topics: NASA Technical Reports Server (NTRS), FISSION, THERMOELECTRICITY, NUCLEAR ELECTRIC PROPULSION,...
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178
May 31, 2011
05/11
by
Chen, James R.; Mathe, Nathalie; Wolfe, Shaw
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In this paper, we present DIAMS, a system of distributed, collaborative information agents which help users access, collect, organize, and exchange information on the World Wide Web. Personal agents provide their owners dynamic displays of well organized information collections, as well as friendly information management utilities. Personal agents exchange information with one another. They also work with other types of information agents such as matchmakers and knowledge experts to facilitate...
Topics: END-TO-END DATA SYSTEMS, COMPUTERIZED SIMULATION, ENGINE TESTS, NUCLEAR ELECTRIC PROPULSION,...
Space nuclear power systems are considered for use in those particular spacecraft applications for which nuclear power systems offer unique advantages over solar and/or chemical space power systems. Both isotopic and reactor heated space electrical power units are described in an attempt to illustrate their operating characteristics, spacecraft integration aspects, and factory-to-end of mission operational considerations. The status of technology developments in nuclear power systems is...
Topics: NASA Technical Reports Server (NTRS), NUCLEAR ELECTRIC POWER GENERATION, NUCLEAR ELECTRIC...
Current designs for out of core thermionic energy conversion (TEC) to power nuclear electric propulsion (NEP) were evaluated. Approaches to improve out of core TEC are emphasized and probabilities for success are indicated. TEC gains are available with higher emitter temperatures and greater power densities. Good potentialities for accommodating external high temperature, high power density TEC with heat pipe cooled reactors exist.
Topics: NASA Technical Reports Server (NTRS), ENERGY CONVERSION EFFICIENCY, NUCLEAR ELECTRIC PROPULSION,...
