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Glutathione in cyanobacteria - Bermudes, DThe effects of light and O2 on glutathione production were determined. Results of light and dark studies under normal and reduced oxygen tensions were compared to determine the effect of reduction in oxygen tension on glutathione levels. The growth rate of Anacystis nidulans and concurrent production of glutathione is presented. The generation of time of Anacystis nidulans was approximately 12 hours...Keywords: ELECTRON TRANSFER; OXIDATION; PROTONS; SULFIDES; GROWTH; HYDROGEN; OXIDATION; PROTONS; SULFIDES; ELECTRON TRANSFER; GROWTH; HYDROGENDownloads: 1
Buoyant densities of phototrophic sulfur bacteria and cyanobacteria - Guerrero, RThe buoyant densities of bacterial cells are greatly influenced by the accumulation of intracellular reserve material. The buoyant density of phototrophic bacteria that are planktonic is of particular interest, since these organisms must remain in the photic zone of the water column for optimal growth. Separation of cells by their buoyant density may also be of use in separating and identifying organisms from a natural population...Keywords: GAIA HYPOTHESIS; MICROORGANISMS; OCEANS; OXIDATION; SULFUR; TEMPERATURE DEPENDENCE; TROPOSPHEREDownloads: 2
A theoretical and experimental investigation of the dynamic response of rolamite - Percival, C. M.Lagrange's equation was used to derive an equation of motion for the rolamite mechanism in the ideal tight configuration; the effects of force generation by bands at varying bending stifness, band inertia, and nonconservative forces are considered. An experimental system for investigating the dynamic response of rolamite is described. The effects of friction on the rolamite mechanism are discussed and experimentally determined values of coefficients of friction are presented.Keywords: EXHAUST GASES; FISSION PRODUCTS; NUCLEAR ENGINE FOR ROCKET VEHICLES; PAYLOADS; NEUTRONS; NUCLEAR RADIATION; RADIATION EFFECTSDownloads: 3
Structure and physiology of Beggiatoa and Thiothrix - Schmidt, T. MReggiatoa and Thiothrix are genera of filamentous, colorless, sulfide oxidizing bacteria. These organisms are microaerophilic, oxidizing sulfide to sulfur in the presence of oxygen. The sulfur accumulates in intracellular sulfur globules - the outstanding morphological feature of these bacteria. Some strains are able to further oxidize the sulfur to sulfate aerobically or reduce the sulfur to sulfide anaerobically...Keywords: MARINE ENVIRONMENTS; SEDIMENTS; SULFIDES; AQUEOUS SOLUTIONS; PH; REACTION KINETICSDownloads: 2
PORTRAYING THE MORNING STAR (VENERA-9 AND -10 TELEVISION CAMERAS - IVANOV, YTHE DIFFICULTIES ASSOCIATED WITH CONSTRUCTING THE VENERA-9 AND -10 TELEVISION CAMERAS FOR OPERATION ON THE VENUS SURFACE ARE DESCRIBED. A VIDEO SIGNAL WAS PRODUCED BY DIRECT OPTICAL-MECHANICAL (MIRROR) SCANNING OF THE VENUS LANDSCAPE WITH TELEPHOTOMETERS. DIFFICULTIES IN CRATING AN ADEQUATE SEAL BETWEEN THE GLASS WINDOW AND THE TELEPHOTOMETER HOUSING ARE ALSO DESCRIBED.Keywords: DATA LINKS; HELIOS A; SOLAR ORBITS; DEEP SPACE NETWORK; HELIOS B; MISSION PLANNING; OPERATIONAL PROBLEMSDownloads: 4
Three dimensional thrust chamber life prediction - Armstrong, W. H.A study was performed to analytically determine the cyclic thermomechanical behavior and fatigue life of three configurations of a Plug Nozzle Thrust Chamber. This thrust chamber is a test model which represents the current trend in nozzle design calling for high performance coupled with weight and volume limitations as well as extended life for reusability. The study involved the use of different materials and material combinations to evaluate their application to the problem of low-cycle fatig...Keywords: U.S.S.R. SPACE PROGRAM; VENERA SATELLITES; VENUS (PLANET); DATA TRANSMISSION; PLANETARY SURFACESDownloads: 2
Rolamite fundamentals - Ford, J. PThe rolamite suspension system, its history, features, and capabilities are summarized. Data are included on basic constraints of the system, technical applications, system limitations, and design features.Keywords: CLOUD CHAMBERS; FLAT PLATES; HEAT EXCHANGERS; EVAPORATORS; HEAT TRANSFER; PLANAR STRUCTURESDownloads: 8
Material properties and tolerances in rolamite bands - Walmer, M. SThe rolamite band, the most important part of the rolamite geometry, is examined for spring force effectiveness and other important properties. Characteristics of typical band alloys Havar and beryllium copper are presented for various production methods. Also presented are data on production of rolamite bands, and some basic guidelines for rolamite band design.Keywords: COST ANALYSIS; SPACE PROGRAMS; TECHNOLOGY TRANSFER; TECHNOLOGY UTILIZATION; ENERGY SOURCES; INFORMATION DISSEMINATION; INFORMATION SYSTEMS; SATELLITE OBSERVATION; TECHNOLOGY ASSESSMENTDownloads: 5
Microanalysis of dissolved iron and phosphate in pore waters of hypersaline sediment - Haddad, R.Diurnal fluctuations of reduced iron concentrations, expected to occur in reduced sediments in the photic zone, were studied. Iron concentration was compared to O2-H2S, a microcanalysis of sulfate reduction was performed, as well as an examination of diurnal concentration of dissolved phosphate and changes in interstitial CO2. The iron profiles suggest a strong correlation between iron remobilization and processes occurring in the light...Keywords: CYCLES; IONS; IRON; PH; PRECIPITATES; MANGANESE; OXIDATION; REDUCTION (CHEMISTRY); SULFUR; BACTERIA; CATALYSTS; ELECTRONS; ENVIRONMENTSDownloads: 3
Microbial communities and microprofiles of sulfide and oxygen of alum rock sulfur springs - Fischer, UThe microbial community of Alum Rock sulfur spring Site 3 was studied along one branch of the main stream and between the two branches, 150 cm distant from the source. The community at the source was dominated by green sulfur photosynthetic bacteria of the genus Chlorobium. At 15 cm to 35 cm from the source dominance in the community shifted to the genus Flexibacter at the surface of the mat and purple bacteria of the genus Chromatium underneath...Keywords: BIOGEOCHEMISTRY; PRODUCTIVITY; THEMATIC MAPPING; CANOPIES (VEGETATION); CYCLES; ECOSYSTEMS; NITROGEN; REMOTE SENSING; SOILS; CORRELATION; INFRARED RADIATIONDownloads: 2
Attitude Determination Error Analysis System (ADEAS) mathematical specifications document - Nicholson, MarkThe mathematical specifications of Release 4.0 of the Attitude Determination Error Analysis System (ADEAS), which provides a general-purpose linear error analysis capability for various spacecraft attitude geometries and determination processes, are presented. The analytical basis of the system is presented. The analytical basis of the system is presented, and detailed equations are provided for both three-axis-stabilized and spin-stabilized attitude sensor models.Keywords: CHEMICAL BONDS; COMBUSTION CHEMISTRY; COMPUTATIONAL CHEMISTRY; CONFIGURATION INTERACTION; ELECTRONS; ETHANE; NITROGEN; SELF CONSISTENT FIELDS; THERMODYNAMIC PROPERTIES; DISSOCIATION; EXCITATION; MOLECULAR ENERGY LEVELS; NUCLEAR BINDING ENERGY; VALENCE; VIBRATIONAL SPECTRA; ACETYLENE; ANGULAR MOMENTUMDownloads: 23
Future mission studies: Forecasting solar flux directly from its chaotic time series - Ashrafi, SThe mathematical structure of the programs written to construct a nonlinear predictive model to forecast solar flux directly from its time series without reference to any underlying solar physics is presented. This method and the programs are written so that one could apply the same technique to forecast other chaotic time series, such as geomagnetic data, attitude and orbit data, and even financial indexes and stock market data...Keywords: CRYOGENICS; DESIGN ANALYSIS; FLUID MECHANICS; LAMINAR FLOW; SUPERSONIC WIND TUNNELS; CONSTRUCTION; HIGH SPEED; NOZZLE DESIGN; WIND TUNNEL APPARATUSDownloads: 11
Single layer multi-color luminescent display and method of making - NONThe invention is a multi-color luminescent display comprising an insulator substrate and a single layer of host material, which may be a phosphor deposited thereon that hosts one or more different impurities, therein forming a pattern of selected and distinctly colored phosphors such as blue, green, and red phosphors in a single layer of host material. Transparent electrical conductor means may be provided for subjecting selected portions of the pattern of colored phosphors to an electric field,...Keywords: DATA MANAGEMENT; REQUIREMENTS; DATA PROCESSING; MANAGEMENT PLANNING; NASA PROGRAMS; PROJECT MANAGEMENT; DATA ACQUISITION; FORMAT; INSTRUMENTS; PERSONNELDownloads: 4
Mosquito Lagoon environmental resources inventory - Provancha, Jane A.This document provides a synopsis of biotic and abiotic data collected in the Mosquito Lagoon area in relation to water quality. A holistic ecological approach was used in this review to allow for summaries of climate, land use, vegetation, geohydrology, water quality, fishes, sea turtles, wading birds, marine mammals, invertebrates, shellfish, and mosquito control. The document includes a bibliographic database list of 157 citations that have references to the Mosquito Lagoon, many of which wer...Keywords: AEROSPACE PLANES; ARTIFICIAL INTELLIGENCE; NONLINEARITY; OPTIMAL CONTROL; ROBUSTNESS (MATHEMATICS); AIR BREATHING ENGINES; CONTROL SYSTEMS DESIGN; FLIGHT CONTROL; HYPERSONIC VEHICLES; REAL TIME OPERATION; SINGLE STAGE TO ORBIT VEHICLES; SPACECRAFT CONTROL; TRAJECTORY PLANNINGDownloads: 4
Experimental investigation of adaptive control of a parallel manipulator - Nguyen, Charles C.The implementation of a joint-space adaptive control scheme used to control non-compliant motion of a Stewart Platform-based Manipulator (SPBM) is presented. The SPBM is used in a facility called the Hardware Real-Time Emulator (HRTE) developed at Goddard Space Flight Center to emulate space operations. The SPBM is comprised of two platforms and six linear actuators driven by DC motors, and possesses six degrees of freedom...Keywords: APOLLO PROJECT; ENGINEERING MANAGEMENT; HISTORIES; PERSONNEL; SCIENTISTS; AERONAUTICAL ENGINEERING; AEROSPACE ENGINEERING; SPACE INDUSTRIALIZATIONDownloads: 2
Multiresponse imager and imaging process for improved resolution - NONThe implementation of this invention consists of two elements, the image gathering device and an image restoration filter algorithm. The image gathering device is implemented with an optical aperture control that allows one to change the spatial frequency response of the image gathering device for each one of the successive image acquisitions; the image restoration algorithm unscrambles the within-passband and aliased signal components in the presence of photosensor noise to produce an image wit...Keywords: PARALLEL PROCESSING (COMPUTERS); PIPELINING (COMPUTERS); PROGRAMMING LANGUAGES; ALGORITHMS; COMPILERS; PROTOCOL (COMPUTERS)Downloads: 3
Polybenzimidazoles via aromatic nucleophilic displacement - NONPolybenzimidazoles (PBIs) are heterocyclic macromolecules commonly prepared by the condensation reaction of an aromatic bis(o-diamine) with an aromatic diacid or derivative thereof. These polymers possess high thermal, thermooxidative, and chemical stability; good mechanical properties; and excellent flame resistances, making them high-performance/high-temperature materials which are attractive for use in harsh environments...Keywords: HEAT EXCHANGERS; HEAT PIPES; SHUTDOWNS; TEMPERATURE EFFECTS; HEAT TRANSFER; LUNAR BASED EQUIPMENT; NUCLEAR POWER REACTORS; REACTOR CORES; REACTOR DESIGN; SPACE POWER REACTORS; DUCTS; GRAVITATIONAL EFFECTSDownloads: 6
Effects of retardation in relativistic equations with confining interaction - Maung, Khin MaungA method has been developed for solving two body relativistic bound state equations in momentum space with a confining interaction. A total of six different three dimensional reductions of the Bethe-Salpeter equations are studied with particular emphasis placed on the competing roles of relativistic kinematics and retardation. The results indicate that these two effects counteract each other and this sheds some light on why nonrelativistic models of meson spectroscopy have been quite successful.Keywords: COLOR; IMPURITIES; INVENTIONS; ION IMPLANTATION; SUBSTRATES; THERMAL DIFFUSION; TRANSPARENCE; DISPLAY DEVICES; ELECTROLUMINESCENCE; INSULATORS; LUMINESCENCE; PHOSPHORS; CONDUCTORS; DEPOSITION; ELECTRIC FIELDSDownloads: 3
Confining potential in momentum space - Norbury, John W.A method is presented for the solution in momentum space of the bound state problem with a linear potential in r space. The potential is unbounded at large r leading to a singularity at small q. The singularity is integrable, when regulated by exponentially screening the r-space potential, and is removed by a subtraction technique. The limit of zero screening is taken analytically, and the numerical solution of the subtracted integral equation gives eigenvalues and wave functions in good agreeme...Keywords: DESIGN ANALYSIS; FATIGUE LIFE; GEARS; OPTIMIZATION; SHAFTS (MACHINE ELEMENTS); ALGORITHMS; INTERPOLATION; POLYNOMIALSDownloads: 4
Single nucleon emission in relativistic nucleus-nucleus reactions - Norbury, John W.Significant discrepancies between theory and experiment have previously been noted for nucleon emission via electromagnetic processes in relativistic nucleus-nucleus collisions. The present work investigates the hypothesis that these discrepancies have arisen due to uncertainties about how to deduce the experimental electromagnetic cross section from the total measured cross section. An optical-model calculation of single neutron removal is added to electromagnetic cross sections and compared to...Keywords: DATA ACQUISITION; RADIO NAVIGATION; SPACE DEBRIS; DATA SYSTEMS; DEEP SPACE NETWORK; INFORMATION SYSTEMS; SPACE COMMUNICATION; TELECOMMUNICATION; AEROSPACE SYSTEMS; RADAR ASTRONOMY; RADIO ASTRONOMYDownloads: 3
A letter of intent for an experiment to study strong electromagnetic fields at RHIC via multiple electromagnetic processes - Fatyga, M.An experimental program at the Relativistic Heavy Ion Collider (RHIC) which is designed to study nonperturbative aspects of electrodynamics is outlined. Additional possibilities for new studies of electrodynamics via multiple electromagnetic processes are also described.Keywords: ATMOSPHERIC CHEMISTRY; AMBIPOLAR DIFFUSION; ELECTRON IMPACT; IONIC DIFFUSION; NITROGEN; PHOTOELECTRONS; PHOTOIONIZATION; DAYGLOW; EARTH (PLANET); EXTREME ULTRAVIOLET RADIATION; IONOSPHERES; SPECTRUM ANALYSIS; THERMOSPHERE; TITAN; TRITONDownloads: 4
Support activities to maintain SUMS flight readiness - Wright, WilliThe Shuttle Upper Atmosphere Mass Spectrometer (SUMS), a component experiment of the NASA Orbital Experiments Program (OEX), was flown aboard the shuttle Columbia (OV102) mounted at the forward end of the nose landing gear well with an atmospheric gas inlet system fitted to the lower fuselage (chin panel) surface. The SUMS was designed to provide atmospheric data in flow regimes inaccessible prior to the development of the Space Transportation System (STS)...Keywords: ACTUATORS; PAYLOADS; REAL TIME OPERATION; TRAJECTORIES; ADAPTIVE CONTROL; CONTROL SYSTEMS DESIGN; CONTROLLERS; END EFFECTORS; MANIPULATORS; MODEL REFERENCE ADAPTIVE CONTROL; ROBOT CONTROL; DEGREES OF FREEDOMDownloads: 3
Support activities to maintain SUMS flight readiness, volume 2. Attachment A: Flight 61-C report - Wright, WilliThe Shuttle Upper Atmosphere Mass Spectrometer (SUMS), a component experiment of the NASA Orbital Experiments Program (OEX), was flown aboard the shuttle Columbia (OV102) mounted at the forward end of the nose landing gear well with an atmospheric gas inlet system fitted to the lower fuselage (chin panel) surface. The SUMS was designed to provide atmospheric data in flow regimes inaccessible prior to the development of the Space Transportation system (STS)...Keywords: HISTORIES; NASA PROGRAMS; RESEARCH AND DEVELOPMENT; RESEARCH FACILITIES; RESEARCH PROJECTS; DISTRICT OF COLUMBIA; DOCUMENTS; RESEARCH MANAGEMENT; TEST FACILITIESDownloads: 3
Support activities to maintain SUMS flight readiness, volume 3. Attachment B: Flight STS-35 report, section A - Wright, WilliThe Shuttle Upper Atmosphere Mass Spectrometer (SUMS), a component experiment of the NASA Orbital Experiments Program (OEX), was flown aboard the shuttle Columbia (OV102) mounted at the forward end of the nose landing gear well with an atmospheric gas inlet system fitted to the lower fuselage (chin panel) surface. The SUMS was designed to provide atmospheric data in flow regimes inaccessible prior to the development of the Space Transportation System (STS)...Keywords: DEFECTS; COMPOSITE STRUCTURES; FREQUENCIES; STANDARDS; TIME DEPENDENCE; EDDY CURRENTS; HEAT SOURCES; HEAT TRANSMISSION; INCLUSIONS; LAMINATES; NONDESTRUCTIVE TESTS; TEMPERATURE MEASUREMENT; AEROSPACE VEHICLESDownloads: 3
Support activities to maintain SUMS flight readiness, volume 4. Attachment B: Flight STS-35 report, section B - Wright, WilliThe Shuttle Upper Atmosphere Mass Spectrometer (SUMS), a component experiment of the NASA Orbital Experiments Program (OEX), was flown aboard the shuttle Columbia (OV102) mounted at the forward end of the nose landing gear well with an atmospheric gas inlet system fitted to the lower fuselage (chin panel) surface. The SUMS was designed to provide atmospheric data in flow regimes inaccessible prior to the development of the Space Transportation System (STS)...Keywords: AERODYNAMIC CONFIGURATIONS; AERODYNAMICS; ALGORITHMS; COMPUTATIONAL FLUID DYNAMICS; DESIGN ANALYSIS; OPTIMIZATION; DIFFERENTIAL EQUATIONS; SENSITIVITY; SHAPESDownloads: 4
Support activities to maintain SUMS flight readiness, volume 5. Attachment B: Flight STS-35 report, section C - Wright, WilliThe Shuttle Upper Atmosphere Mass Spectrometer (SUMS), a component experiment of the NASA Orbital Experiments Program (OEX), was flown aboard the shuttle Columbia (OV102) mounted at the forward end of the nose landing gear well with an atmospheric gas inlet system fitted to the lower fuselage (chin panel) surface. The SUMS was designed to provide atmospheric data in flow regimes inaccessible prior to the development of the Space Transportation System (STS)...Keywords: ALGORITHMS; PHOTOELECTRICITY; TARGETS; FREQUENCY RESPONSE; IMAGE FILTERS; IMAGE PROCESSING; IMAGE RESOLUTION; IMAGING TECHNIQUES; RESTORATION; APERTURES; INVENTIONSDownloads: 4
Support activities to maintain SUMS flight readiness, volume 6. Attachment B: Flight STS-35 report, section D - Wright, WilliThe Shuttle Upper Atmosphere Mass Spectrometer (SUMS), a component experiment of the NASA Orbital Experiments Program (OEX), was flown aboard the shuttle Columbia (OV102) mounted at the forward end of the nose landing gear well with an atmospheric gas inlet system fitted to the lower fuselage (chin panel) surface. The SUMS was designed to provide atmospheric data in flow regimes inaccessible prior to the development of the Space Transportation System (STS)...Keywords: ACIDS; THERMAL STABILITY; ALKALI METALS; AZOLES; DERIVATION; DISPLACEMENT; FLAMES; GLASS TRANSITION TEMPERATURE; INVENTIONS; MECHANICAL PROPERTIES; MOLECULES; BENZENE; SOLUBILITY; CHEMICAL REACTIONS; CONDENSING; HETEROCYCLIC COMPOUNDS; MONOMERS; PHENYLS; POLYBENZIMIDAZOLE; PROCESS CONTROL (INDUSTRY)Downloads: 3
Turbine blade tip and seal clearance excitation forces - Martinez-Sanchez, M.Experimental and theoretical work done as Phase 3 of a program sponsored by MSFC to investigate the magnitude, origin, and parametric variations of destabilizing forces which arise in high power turbines due to blade-tip leakage effects are described. The two facilities which were built for this purpose are first described. The larger one is a closed, 2 atm pressurized Freon-12 flow loop in which is installed a 1:1 replica of the SSME first stage hydrogen turbine, which can be driven by the flow...Keywords: AERODYNAMICS; RODS; SIMULATION; ANGLE OF ATTACK; BYPASSES; DISTORTION; FLOW DISTRIBUTION; INLET FLOW; NACELLES; VORTEX GENERATORS; BLOCKINGDownloads: 5
Space Station Simulation Computer System (SCS) study for NASA/MSFC. Phased development plan - NONNASA's Space Station Freedom Program (SSFP) planning efforts have identified a need for a payload training simulator system to serve as both a training facility and as a demonstrator to validate operational concepts. The envisioned MSFC Payload Training Complex (PTC) required to meet this need will train the Space Station payload scientists, station scientists and ground controllers to operate the wide variety of experiments that will be onboard the Space Station Freedom...Keywords: BOUNDARIES; CRACK GEOMETRY; ELASTIC DEFORMATION; PREDICTION ANALYSIS TECHNIQUES; TENSILE STRENGTH; BOUNDARY ELEMENT METHOD; CRACK TIPS; ELASTIC PLATES; FINITE ELEMENT METHOD; FRACTURE MECHANICS; PLANE STRAIN; STRESS INTENSITY FACTORS; APPLICATIONS PROGRAMS (COMPUTERS)Downloads: 2
SeaWiFS calibration and validation plan, volume 3 - Mcclain, Charles R.The Sea-viewing Wide Field-of-view Sensor (SeaWiFS) will be the first ocean-color satellite since the Nimbus-7 Coastal Zone Color Scanner (CZCS), which ceased operation in 1986. Unlike the CZCS, which was designed as a proof-of-concept experiment, SeaWiFS will provide routine global coverage every 2 days and is designed to provide estimates of photosynthetic concentrations of sufficient accuracy for use in quantitative studies of the ocean's primary productivity and biogeochemistry...Keywords: COMPUTER GRAPHICS; PROTOTYPES; REQUIREMENTS; DATA RETRIEVAL; DATA STORAGE; DOCUMENTS; EXPERT SYSTEMS; FEASIBILITY ANALYSIS; HUMAN-COMPUTER INTERFACE; PAYLOADS; HYPERTEXTDownloads: 4
Rational approximations from power series of vector-valued meromorphic functions - Sidi, AvraLet F(z) be a vector-valued function, F: C yields C(sup N), which is analytic at z = 0 and meromorphic in a neighborhood of z = 0, and let its Maclaurin series be given. In this work we developed vector-valued rational approximation procedures for F(z) by applying vector extrapolation methods to the sequence of partial sums of its Maclaurin series. We analyzed some of the algebraic and analytic properties of the rational approximations thus obtained, and showed that they were akin to Pade approx...Keywords: AIRCRAFT CONSTRUCTION MATERIALS; POLYMER MATRIX COMPOSITES; RELIABILITY ENGINEERING; RESIN MATRIX COMPOSITES; STRUCTURAL RELIABILITY; TOLERANCES (MECHANICS); COMPOSITE STRUCTURES; CONFERENCES; FIBER COMPOSITES; STRUCTURAL ANALYSIS; STRUCTURAL DESIGN; DAMAGE; MECHANICAL PROPERTIES; METAL MATRIX COMPOSITESDownloads: 13
Onsite analysis of data from the Dynamics Explorer (DE) spacecraft - Fung, Shing F.The tasks performed by ARC Professional Services Group, Inc. fell into five parts: (1) dynamics explorer (DE) data analysis and modeling; (2) DE project support; (3) chemical release observations support; (4) VLF emissions and plasma instability studies; and (5) modeling of planetary radio emissions. Some recommendations for future considerations are also addressed.Keywords: BACKSCATTERING; ADHESIVE BONDING; CURING; DURABILITY; IMPACT LOADS; IMPACT STRENGTH; STATIC LOADS; STATIC STABILITY; COMPOSITE STRUCTURES; DAMAGE ASSESSMENT; FATIGUE LIFE; FIBER COMPOSITES; IMPACT DAMAGE; IMPACT TESTS; STATIC TESTS; TOLERANCES (MECHANICS)Downloads: 3
Assessment of the present NASA optical metrology capabilities and recommendations for establishing an in-house NASA Optical Metrology Group - Parks, Robert EAn investigation into when it was first recognized that there was a deficiency in NASA optical metrology oversight capability, why this deficiency existed unnoticed for so long, and a proposal for correcting the problem is presented. It is explained why this optical metrology oversight is so critical to program success and at the same time, why it is difficult to establish due to the nature of the technology...Keywords: CONFERENCES; AVIONICS; CONSTRUCTION; NASA PROGRAMS; SOLAR POWER SATELLITES; THERMOELECTRICITY; HABITATS; LUNAR BASES; LUNAR COMMUNICATION; LUNAR ROVING VEHICLES; LUNAR SHELTERS; MISSION PLANNING; MOON; SPACE EXPLORATIONDownloads: 4
The process group approach to reliable distributed computing - Birman, Kenneth PThe difficulty of developing reliable distribution software is an impediment to applying distributed computing technology in many settings. Experience with the ISIS system suggests that a structured approach based on virtually synchronous process groups yields systems that are substantially easier to develop, exploit sophisticated forms of cooperative computation, and achieve high reliability. Six years of research on ISIS, describing the model, its implementation challenges, and the types of ap...Keywords: LUNAR BASES; EXTRAVEHICULAR ACTIVITY; GENERAL OVERVIEWS; INTRAVEHICULAR ACTIVITY; SIMPLIFICATION; LUNAR EXPLORATION; MISSION PLANNING; MOON; SPACE EXPLORATION; SPACE HABITATS; SPACECRAFT LAUNCHING; CARGO; COST REDUCTIONDownloads: 3
SRB thermal curtain design support - Lundblad, Wayne EThe objective during this time period was to perform a preliminary thermal analysis using some measured and estimated thermal properties on the angle-interlock materials. This preliminary thermal analysis is to serve as a guide for identifying any potential problems in blanket construction and identifying future tests.Keywords: FEASIBILITY ANALYSIS; LUNAR BASES; LUNAR CONSTRUCTION EQUIPMENT; LUNAR LANDING MODULES; LUNAR SURFACE VEHICLES; RADIATION SHIELDING; CRANES; SCRAPERS; TRACTORSDownloads: 3
Modal test/analysis correlation of Space Station structures using nonlinear sensitivity - Gupta, Viney K.The modal correlation problem is formulated as a constrained optimization problem for validation of finite element models (FEM's). For large-scale structural applications, a pragmatic procedure for substructuring, model verification, and system integration is described to achieve effective modal correlation. The space station substructure FEM's are reduced using Lanczos vectors and integrated into a system FEM using Craig-Bampton component modal synthesis...Keywords: CONSTRUCTION; VACUUM CHAMBERS; ENGINEERING; ENVIRONMENT SIMULATION; EXTRATERRESTRIAL ENVIRONMENTS; LUNAR ENVIRONMENT; LUNAR SURFACE; RESEARCH FACILITIES; LUNAR DUST; LUNAR SOILDownloads: 2
Index to 1986 NASA Tech Briefs, volume 11, numbers 1-4 - NONShort announcements of new technology derived from the R&D activities of NASA are presented. These briefs emphasize information considered likely to be transferrable across industrial, regional, or disciplinary lines and are issued to encourage commercial application. This index for 1986 Tech Briefs contains abstracts and four indexes: subject, personal author, originating center, and Tech Brief Number...Keywords: HEAT SOURCES; RADIOISOTOPE BATTERIES; SPACE POWER REACTORS; SPACECRAFT POWER SUPPLIES; THERMOELECTRIC GENERATORS; THERMOELECTRICITY; CASSINI MISSION; GALILEO PROJECT; ULYSSES MISSIONDownloads: 3
Investigation at low speeds of the effect of aspect ratio and sweep on rolling stability derivatives of untapered wings - Goodman, AlexA low scale wind tunnel investigation was conducted in rolling flow to determine the effects of aspect ratio and sweep (when varied independently) on the rolling stability derivatives for a series of untapered wings. Test results indicate that when the aspect ratio was held constant, an increase in the sweepback angle caused a significant reduction in the damping in roll at low lift coefficients for only the higher aspect ratios that were tested...Keywords: AEROSPACE ENGINEERING; LIQUID ROCKET PROPELLANTS; PROPELLANT TANKS; LIQUID PROPELLANT ROCKET ENGINES; ROCKET ENGINE DESIGN; SPACE EXPLORATION; TECHNOLOGY ASSESSMENT; TECHNOLOGY UTILIZATION; CARBON; COMPOSITE STRUCTURES; HELIUMDownloads: 3
Communications Technology Satellite (CTS) postlaunch report - Tandon, G. K.The support is described which was provided by the Goddard Space Flight Center Attitude Determination and Control Section and its contractor, Computer Sciences Corp., during the two weeks immediately following the launch of the Communications Technology Satellite on 17 Jan. 1976. Results concerning attitude sensor performance, attitude and bias determination, and attitude control system performance are presented...Keywords: CRYOGENIC ROCKET PROPELLANTS; USER REQUIREMENTS; DESIGN ANALYSIS; LUNAR LANDING; STORABLE PROPELLANTS; TECHNOLOGY ASSESSMENT; TRADEOFFS; GROUND TESTS; HEAT FLUX; MOONDownloads: 10
Saturn AS-205/CSM-101 postflight trajectory, part 4 - Nichols, J. WThis report presents the postflight trajectory of the Saturn AS-205/Command Service Module-101 (CSM) vehicle from guidance reference release to S-4B/CSM-101 separation. Included in the report is an analysis of the powered flight trajectory, orbital flight trajectory, orbital effects of the S-4B propellant dump safing experiment, and ballistic free flight to impact of the expended S-1B stage.Keywords: CYLINDRICAL BODIES; DESIGN ANALYSIS; RADIATION SHIELDING; INFLATABLE STRUCTURES; LIFE SUPPORT SYSTEMS; PNEUMATIC EQUIPMENT; RIGID STRUCTURES; SPACE HABITATS; SPACECRAFT MODULES; CLOSED ECOLOGICAL SYSTEMS; CONSTRUCTIONDownloads: 6
The economic impact of NASA research and development spending: An update - Cross, David MThe problems encountered in trying to replicate the study with an expanded time series calls into serious question the soundness of results obtainable from this sort of 'macro' level approach to the estimation of returns to NASA R&D expenditures. While it is possible that some of these difficulties could be overcome if more time and effort were devoted to the task, there are conceptual simplifications implicit in the aggregate approach that will not disappear with more work.Keywords: CONFERENCES; GLOBAL POSITIONING SYSTEM; HYDROGEN; LORAN; RUBIDIUM; SYNCOM SATELLITES; FREQUENCY STANDARDS; NAVIGATION SATELLITES; OPTICAL TRACKING; SATELLITE INSTRUMENTS; TIME MEASUREMENT; TRACKING NETWORKS; TRAPPED PARTICLES; CESIUMDownloads: 7
Analysis of SMS-2 attitude sensor behavior including OABIAS results - Chen, L. CThe Synchronous Meteorological Satellite-2 (SMS-2) was launched on 6 Feb. 1975. For the first four days of the mission an extensive program of attitude and bias determination was carried out using primarily the Multisatellite Attitude Determination/Optical Aspect Bias Determination System (MSAD/OABIAS). The results of this analysis are presented, and specific recommendations for the support of future missions are made...Keywords: ABSORPTIVITY; RADIO FREQUENCIES; RESONANT VIBRATION; SEPARATION; SOUND WAVES; TRANSDUCERS; MAGNETIC FIELDS; RESONANCEDownloads: 2
Saturn SA-6 postflight trajectory - Riddle, Gerald R.The postflight trajectory is presented for the Saturn SA-6 test flight. Trajectory dependent parameters are given in earth-fixed, space-fixed, and geographic coordinate systems. A complete time history of the powered flight trajectory is presented at 1.0 sec intervals from first motion through insertion. Tables of insertion conditions and various orbital parameters are included in a discussion of the orbital portion of flight...Keywords: COMPUTATIONAL CHEMISTRY; GROUND STATE; HYDRIDES; INFRARED SPECTRA; PERTURBATION THEORY; SPIN-ORBIT INTERACTIONS; DIRAC EQUATION; GERMANIUM OXIDES; HARTREE APPROXIMATION; LEAD OXIDES; QUANTUM CHEMISTRY; RELATIVISTIC EFFECTS; TIN OXIDES; DIPOLE MOMENTSDownloads: 6
Ruthenium/iridium ratios in the Cretaceous-Tertiary boundary clay: Implications for global dispersal and fractionation within the ejecta cloud - Evans, Noreen JoyceRuthenium (Ru) and iridium (Ir) are the least mobile platinum group elements (PGE's) within the Cretaceous-Tertiary (K-T) boundary clay (BC). The Ru/Ir ratio is, therefore, the most useful PGE interelement ratio for distinguishing terrestrial and extraterrestrial contributions to the BC. The Ru/Ir ratio of marine K-T sections (1.77 /- 0.53) is statistically different from that of the continental sections (0.93 /- 0.28)...Keywords: ORBIT INSERTION; POSTFLIGHT ANALYSIS; SPACECRAFT TRAJECTORIES; TRAJECTORY OPTIMIZATION; COORDINATES; EARTH (PLANET); FLIGHT PATHS; PARAMETERIZATION; SATURN PROJECTDownloads: 8
Bronzite Granophyre: New insight on Vredefort - Therriault, A. M.The Vredefort Dome is located near the center of the Witwatersrand Basin, about 120 km southeast of Johannesburg, South Africa. Its origin is enigmatic, ranging from a major impact event to endogenous processes, either igneous or tectonic. A unique melt rock, the 'Bronzite' Granophyr, occurs in the Vredefort structure as vertical ring dikes along the contact between sedimentary collar and core of Archaean granites, and as vertical dikes extending northwest-southeast and northeast-southwest in th...Keywords: DATA BASES; LINGUISTICS; GRAPHIC ARTS; IMAGES; INTERFACES; PHOTOGRAPHS; THESAURI; BOOLEAN ALGEBRA; COLLECTION; DISPLAY DEVICESDownloads: 4
Calculation of stress intensity factors in an isotropic multicracked plate. Part 1: Theoretical development - Binienda, W. K.An essential part of describing the damage state and predicting the damage growth in a multicracked plate is the accurate calculation of stress intensity factors (SIF's). Here, a methodology and rigorous solution formulation for SIF's of a multicracked plate, with fully interacting cracks, subjected to a far-field arbitrary stress state is presented. The fundamental perturbation problem is derived, and the steps needed to formulate the system of singular integral equations whose solution gives r...Keywords: ARTIFICIAL INTELLIGENCE; AUTOMATIC CONTROL; BAYES THEOREM; CLASSIFICATIONS; DATA BASES; PROBABILITY THEORY; FUZZY SETS; MACHINE LEARNING; MAXIMUM LIKELIHOOD ESTIMATESDownloads: 4
Requirements analysis notebook for the flight data systems definition in the Real-Time Systems Engineering Laboratory (RSEL) - Wray, Richard BA hybrid requirements analysis methodology was developed, based on the practices actually used in developing a Space Generic Open Avionics Architecture. During the development of this avionics architecture, a method of analysis able to effectively define the requirements for this space avionics architecture was developed. In this methodology, external interfaces and relationships are defined, a static analysis resulting in a static avionics model was developed, operating concepts for simulating ...Keywords: CONTROL SYSTEMS DESIGN; CONTROLLERS; DYNAMICAL SYSTEMS; PROTOTYPES; DYNAMIC CONTROL; EXPERT SYSTEMS; FUZZY SETS; KNOWLEDGE BASES (ARTIFICIAL INTELLIGENCE); MANUFACTURING; PROBLEM SOLVING; PROCESS CONTROL (INDUSTRY); REAL TIME OPERATIONDownloads: 4
Analysis of precracking parameters and fracture toughness for ceramic single-edge-precracked-beam specimens - Choi, Sung R.The single-edge-precracked-beam (SEPB) method involves creation of a straight-through crack from an indentation crack. The straight-through crack is developed by applying a controlled bending load to a specimen via a precracking fixture. The fixture induces the following sequence: (1) stable growth of the indentation crack; (2) pop-in; and finally, (3) arrest-thereby forming a straight-through precrack...Keywords: CRYOGENIC FLUIDS; SUPERFLUIDITY; TELEMETRY; EXPERT SYSTEMS; KNOWLEDGE BASES (ARTIFICIAL INTELLIGENCE); ORBITAL SERVICING; PROCESS CONTROL (INDUSTRY); SPACE SHUTTLE PAYLOADS; SPACE TECHNOLOGY EXPERIMENTS; ERROR ANALYSIS; HELIUMDownloads: 4
SITE project. Phase 1: Continuous data bit-error-rate testing - Fujikawa, GeneThe Systems Integration, Test, and Evaluation (SITE) Project at NASA LeRC encompasses a number of research and technology areas of satellite communications systems. Phase 1 of this project established a complete satellite link simulator system. The evaluation of proof-of-concept microwave devices, radiofrequency (RF) and bit-error-rate (BER) testing of hardware, testing of remote airlinks, and other tests were performed as part of this first testing phase...Keywords: ORBITAL SERVICING; PAYLOAD INTEGRATION; SPACE STATIONS; ALGORITHMS; DEPLOYMENTDownloads: 4
Tropospheric processes: Observations and interpretation - Isaksen, Ivar S. A.Three aspects of tropospheric chemical processes imposed by manmade emission of source gases will be discussed. First, the implications for the OH distribution and thereby for the lifetime of source gases which are controlled by reactions with OH in the troposphere (e.g., CH4 and HCFC) are investigated. This is of importance for stratosphere ozone and climate. Second, we will study the impact of source gas emission on tropospheric ozone and discuss the possibility to estimate indirect climate ef...Keywords: SATELLITE-BORNE INSTRUMENTS; SPACE EXPLORATION; SPACE SHUTTLE PAYLOADS; SPACE STATION PAYLOADS; AEROSPACE ENVIRONMENTS; BALLOONS; FLIGHT INSTRUMENTS; SOLAR SYSTEM; SOUNDING ROCKETSDownloads: 2


JUST IN, PRESS RELEASE:

Friday June 03, 2011
Counterfeit Crackdown - Science News 07:12PM EST (Science News)

... which involved customs officials, the electronic payments industry and the European Heads of Medicines Agencies. Scientists weren't lauded in Interpol's press release. But they played a crucial role in producing key weapons for fighting the counterfeit-drug trade. These tools uncover ...

Economy: When Will Economy Recover? 2014, If Ever, Survey Says 01:35PM EST (CNBC)

... cautiously in light of higher energy costs and inflationary pressures on their household budgets," Steinhafel said, in the company's monthly sales press release . AlixPartners is by no means the first organization to recognize this growing pessimism. Goldman Sachs economist Jan Hatzius ...

Thursday June 02, 2011
Lulz Security claims fresh hack of 1 million Sony accounts - Jun. 2, 2011 06:31PM EST (CNNfn)

... Lulz Security advertised its Sony hack in an ASCII art festooned press release. NEW YORK (CNNMoney) - Sony just can't catch a break from hackers. A group calling itself "Lulz Security" announced a fresh attack on Thursday, posting online snippets of data it says came from a breach ...

Moody's Reveals Huge Taxpayer Subsidy for Banks 05:29PM EST (CNBC)

... and unwilling support of the American taxpayer. Moodys MCO loading. Quote Chart News Profile [MCO Loading. () ] explained in its press release that the debt ratings of the three banks have incorporated unusual levels of uplift based on the assumption that they would be prevented ...

Apple gains control of iCloud domain Apple - CNET News 01:43AM EST (CNET)

... Conference in San Francisco on Monday with the details of iCloud, a much-rumored cloud-based music storage service. The company also indicated in the press release that CEO Steve Jobs, who is on an indefinite medical leave, will be on hand for the announcement. Predictably, Apple did ...

Tuesday May 31, 2011
iCloud mention out of character for Apple Apple Talk - CNET News 04:34PM EST (CNET)
Apple, Jobs to talk iCloud at WWDC The Digital Home - CNET News 09:32AM EST (CNET)
Apple, Jobs to talk iCloud at WWDC The Digital Home - CNET News 09:32AM EST (CNET)
SKorea's Ticket Monster acquires Malaysian site - Yahoo! News 07:07AM EST (Yahoo Tech News)
Sunday May 29, 2011
Questions linger about Amazon outage Data-driven - CNET News 07:21PM EST (CNET)
Thursday May 26, 2011
New York Mets-Hedge Fund Manager Buys Stake in New York Mets 10:47AM EST (CNBC)
New York Mets-Hedge Fund Manager Buys Stake in New York Mets 10:47AM EST (CNBC)
Wednesday May 25, 2011
Kids feel 'high levels' of pain after gaming, texting Health Tech - ... 05:55PM EST (CNET)
Tuesday May 24, 2011
European neo-Nazi websites find home in US - Yahoo! News 06:41AM EST (Yahoo Tech News)
Monday May 23, 2011
Citigroup - Citi Hires Ex-CEO of PricewaterhouseCoopers 11:29AM EST (CNBC)
Citigroup - Citi Hires Ex-CEO of PricewaterhouseCoopers 11:29AM EST (CNBC)
Friday May 20, 2011
Kiss rockers to showcase Babel-busting tech Media Maverick - CNET News 09:22AM EST (CNET)
Wednesday May 18, 2011
LinkedIn will price at $45 a share Digital Media - CNET News 07:14PM EST (CNET)
Ericsson to manage Clearwire's 4G network Signal Strength - CNET News 06:12PM EST (CNET)
Tuesday May 17, 2011
Madoff's extensive booze collection to be auctioned off - May. 17, 2011 02:54PM EST (CNNfn)
Sunday May 15, 2011
Yahoo's Battle with China's Alibaba Intensifies 07:43PM EST (CNBC)
Thursday May 12, 2011
Senators seek curb on digital download taxes Politics and Law - CNET News 05:33PM EST (CNET)
Wednesday May 11, 2011
Macy's Earnings: Macy's Tops Earnings Estimates, Raises Dividend 09:16AM EST (CNBC)
Tuesday May 10, 2011
Surprise! Credit Card Rates Stabilized After New Law 03:13PM EST (CNBC)
Madoff trustee joins forces with Fairfield liquidators - May. 10, 2011 11:10AM EST (CNNfn)
Monday May 09, 2011
Archaeologists discover a Roman-era mummy - CNN.com 06:02PM EST (CNN)
Friday May 06, 2011
Sony Outdated Software Criticized-Another Hack Coming? 11:46AM EST (CNBC)
Thursday May 05, 2011
Anonymous to Sony: It Wasn't Us 11:43PM EST (CNBC)
Demand Media results beat the Street Digital Media - CNET News 07:52PM EST (CNET)
Thursday April 21, 2011
Because Some Foods Carry Organophosphate Residues - Science News 05:10PM EST (Science News)
Tuesday March 22, 2011
The Meltdown That Wasn't: Quick Decisions Prevented a Bigger Nuclear ... 11:59PM EST (Scientific American)
Wednesday March 09, 2011
Meteorites May Hold Fossils From Space - Or Not - Science News 05:21PM EST (Science News)
Friday December 31, 2010
Human Remains Said to 'Rewrite Evolution' Spark Spat 10:10PM EST (Scientific American)
Tuesday December 07, 2010
Microbe gets toxic response 10:05PM EST (Scientific American)
E.T.? No. Arsenic? Yes. Maybe. Hmmm. - Science News 08:16PM EST (Science News)
Saturday December 04, 2010
Poison Nil: Mono Lake Bacterium Exhibits Exotic Arsenic-Driven ... 10:04PM EST (Scientific American)
Wednesday November 17, 2010
Buzz Kill: FDA Cracks Down on Caffeinated Alcoholic Beverages: ... 10:00PM EST (Scientific American)
Saturday November 06, 2010
What Do the 2010 Election Results Mean for Federal Science Budgets?: ... 10:56PM EST (Scientific American)
Monday September 13, 2010
'Sound science' code draws fire : Nature News 10:38PM EST (Scientific American)
Tuesday August 31, 2010
Wheat Genome Announcement Turns Out To Be Small Beer - Science News 08:41PM EST (Science News)
Wednesday July 28, 2010
Greece to invest 12 billion euro in "green growth" by 2015: ... 10:25PM EST (Scientific American)
Tuesday July 13, 2010
Japanese monkey deaths puzzle researchers 10:22PM EST (Scientific American)
Japanese monkey deaths puzzle : Nature News 10:22PM EST (Scientific American)
Friday July 02, 2010
Chronic fatigue findings were held back 10:18PM EST (Scientific American)
Wednesday June 16, 2010
Recommended: Bulletproof Feathers: How Science Uses Nature's Secrets ... 10:04PM EST (Scientific American)
Tuesday June 15, 2010
Loop Current Will Determine Spill's Ultimate Fate - Science News 08:33PM EST (Science News)