| 出版: | [Washington : |
| 出版: | [Washington] : Environmental Protection Agency, Office of Water Programs Operations, Water Quality and Non-Point Source Control Division, Non-Point Source Control Branch |
| 附註: | Report of a study made by Teledyne Brown Engineering Co. and directed by R. D. Baker under contract no. 68-01-0118 with the Office of Water Programs Operations. Includes bibliographies. |
| 出版: | Washington, DC : National Aeronautics and Space Administration |
| 附註: | "H-672." "NASA TN D-6732." "March 1972." Includes bibliographical references (p. 16). Results are presented of a flight-test program utilizing a CV-990 airplane, flow in low-lift-to-drag-ratio (L/D) configurations, to simulate terminal area operation, approach, and landing of large unpowered vehicles. The results indicate that unpowered approaches and landings are practical with vehicles of the size and performance characteristics of the proposed shuttle vehicle. Low L/D landings provided touchdown dispersion patterns acceptable for operation on runways of reasonable length. The dispersion pattern was reduced when guidance was used during the final approach. High levels of pilot proficiency were not required for acceptable performance.--P. [i]. Also available online in PDF from NASA Dryden Flight Research Center Technical Reports Server Web site. Sponsored by the National Aeronautics and Space Administration (NASA); performed by the NASA Dryden Flight Research Center under727-01-01-00-24 |
| 出版: | Bethesda, Md. : For sale by the Supt. of Docs., U.S. Govt. Print. Off., Washington |
| 附註: | Consists of studies prepared by Booz, Allen and Hamilton for the National Blood Resource Program. Contents. - v. 1. Supply and use of the nation's blood resources. - v. 2. Federal and State regulation of the nation's blood resource. - v. 3. Pilot study of hemophilia treatment in the United States. |
| 出版: | [Washington] : United States Dept. of Commerce |
| 附註: | Technical Assistance Grant Project, no. 01-6109132-1 |
| 出版: | Washington, D.C. : National Aeronautics and Space Administration : [For sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151] |
| 附註: | Includes bibliographical references (p. 45). A description of the construction and use of crew provisions and equipment subsystem items for the Apollo Program is presented. The subsystem is composed principally of survival equipment, bioinstrumentation devices, medical components and accessories, water- and waste-management equipment, personal-hygiene articles, docking aids, flight garments (excluding the pressure garment assembly), and various other crew-related accessories. Particular attention is given to items and assemblies that presented design, development, or performance problems: the crew optical alinement sight system, the metering water dispenser, and the waste-management system. Changes made in design and materials to improve the fire safety of the hardware are discussed. |
| 出版: | Washington, D.C. : National Aeronautics and Space Administration : [For sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151] |
| 附註: | Includes bibliographical references (p. 17). Analyses were performed to determine the structural loads caused by maneuvers of the docked Apollo command and service module/lunar module (CSM/LM). Results of CSM/LM docked interface loads analyses and service-propulsion-system engine support structure load analyses are compared with the structural allowable loads of the CSM/LM docked interface and the service-propulsion-system engine thrust mount, respectively, for different phases of spaceflight operations. An analysis also was performed to investigate the loads that resulted from the failure case in which the LM descent propulsion system is started in the full-throttle position. |
| 出版: | Washington : U.S. Govt. Print. Off. |
| 附註: | Issued April 19, 1972 Cover title. |
| 出版: | Washington : Association of Research Libraries |
| 附註: | Bibliography: p. 29 |
| 出版: | [Washington, D.C.] : The Committee |
| 附註: | Cover title. A. History of study.--B. Economic base.--C. Climate, meteorology and hydrology.--D. Geology and ground water.--E. Flood damage reduction and water management for major rivers and coastal areas.--F. Upstream flood prevention and water management.--G. Land use and land management.--H. Minerals.--I. Irrigation.--J. Land drainage.--K. Navigation.--L. Water quality and pollution.--M. Outdoor recreation.--N. Visual and cultural environment.--O. Fish and wildlife.--P. Power.--Q. Erosion and sedimentation.--R. Water supply.--S. Legal and institutional environment.--T. Plan formulation.--U. Coastal and estuarine areas.--V. Health aspects. |
| 出版: | Pasadena, Calif. : W.M. Keck Laboratory of Hydraulics and Water Resources |
| 出版: | [Washington : |
| 附註: | Cover title. Includes bibliographical references. |
| 出版: | [Washington, D.C.] : U.S. Bureau of Mines |
| 附註: | Bibliography: p. 27 |
| 出版: | Washington : Agricultural Research Service, U.S. Dept. of Agriculture |
| 附註: | Bibliography: p. 72-73 |
| 出版: | College Station : Texas Agricultural Experiment Station |
| 附註: | Cover title. Bibliography: p. 23 |
| 出版: | Washington, D.C. : National Aeronautics and Space Administration : [For sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151] |
| 附註: | Includes bibliographical references (p. 28). Test results of a low-temperature space radiator model are presented. Radiator performance is evaluated with a low-thermal-conductivity fluid in laminar flow in D-shaped cross-section tubes. The test covered a Reynolds number range from 50 to 4500 and a fluid temperature range from 294 to 414 K (70 to 286 F). For low-temperature radiators, the fluid-to-surface temperature differential was predominately influenced by fluid temperature in laminar flow. Heat transfer and pressure drop for the radiator tube could be predicted within engineering accuracy from existing correlations. |
| 出版: | Washington, D.C. : National Aeronautics and Space Administration : [For sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151] |
| 附註: | Includes bibliographical references (p. 25). Water flow tests with circumferential inlet and outlet manifolds were conducted to determine factors affecting fluid distribution and pressure losses. Various orifice sizes and manifold geometries were tested over a range of flow velocities. With inlet manifolds, flow distribution was related directly to orifice discharge coefficients. A correlation indicated that nonuniform distribution resulted when the velocity head ratio at the orifice was not in the range of constant discharge coefficient. With outlet manifolds, nonuniform flow was related to static pressure variations along the manifold. Outlet manifolds had appreciably greater pressure losses than comparable inlet manifolds. |
| 出版: | Washington, D.C. : National Aeronautics and Space Administration |
| 附註: | "April 1972." "Prepared by TRW Systems Group ... for Ames Research Center." Cover title. Includes bibliographical references (p. 226-233). |
| 出版: | Washington, D.C. : National Aeronautics and Space Administration : [For sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151] |
| 附註: | Includes bibliographical references (p. 16). As part of a modular inverter-converter development program, control techniques were developed to provide load sharing among paralleled inverters or converters. An analysis of the requirements of paralleling circuits and a discussion of the circuits developed and their performance are included in this report. The current sharing was within 5.6 percent of rated-load current for the ac modules and 7.4 percent for the dc modules for an initial output voltage unbalance of 5 volts. |
| 出版: | Washington, D.C. : [Springfield, Va. : National Aeronautics and Space Administration ; For sale by the National Technical Information Service] |
| 附註: | "March 1972"--Cover. Includes bibliographical references (p. 25-26). The evolution of an initially balanced rotating disk of stars with an initial velocity dispersion given by Toomre's local criterion was investigated by means of a computer model for isolated disks of stars. It was found that the disk is unstable against very large scale modes. A stable axisymmetric disk with a velocity dispersion much larger than that given by Toomre's criterion was generated. The final mass distribution for the disk gives a high density central core and a disk population of stars that is closely approximated by an exponential variation. Various methods and rates of cooling the hot axisymmetric disks were investigated. It was found that the cooling resulted in the development of two-arm spiral structures which persisted as long as cooling continued. An experiment was performed to induce spiral structure in a galaxy by means of the close passage of a companion galaxy. Parameters similar to those expected for M51 and its companion were used. It was found that because of the high velocity dispersion of the disturbed disk galaxy, only a weak two-arm spiral structure appeared. The evolution of a uniformly rotating disk galaxy which is a stationary solution of the collisionless Boltzmann equation was investigated for various values of the initial rms velocity dispersion. It was found that the disk becomes stable at a value of the velocity dispersion predicted by theory. |
| 出版: | Washington, D.C. : National Aeronautics and Space Administration |
| 附註: | Prepared at Lewis Research Center. N72-14941 Includes bibliographical references (p. 29-30). The relative performance of (1) counterflow film cooling, (2) parallel-flow film cooling, (3) convection cooling, (4) adiabatic film cooling, (5) transpiration cooling, and (6) full-coverage film cooling was investigated for heat loading conditions expected in future gas turbine engines. Assumed in the analysis were hot-gas conditions of 2200 K (3500 F) recovery temperature, 5 to 40 atmospheres total pressure, and 0.6 gas Mach number and a cooling air supply temperature of 811 K (1000 F). The first three cooling methods involve film cooling from slots. Counterflow and parallel flow describe the direction of convection cooling air along the inside surface of the wall relative to the main gas flow direction. The importance of utilizing the heat sink available in the coolant for convection cooling prior to film injection is illustrated. |
| 出版: | [Washington, D.C.] : U.S. Dept. of Commerce, National Bureau of Standards : [For sale by the Supt. of Docs., U.S. G.P.O. |
| 附註: | "Effective January 1, 1972"--P. 1 "A voluntary standard developed by producers, distributors, and users with the cooperation of the National Bureau of Standards." "Supersedes CS 214-57"--P. 1 |
| 出版: | [Washington, D.C.] : U.S. Dept. of Interior, Bureau of Mines |
| 附註: | Includes errata sheet. Includes bibliographical references. |
| 出版: | Washington, D.C. : National Aeronautics and Space Administration : [For sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151] |
| 附註: | Includes bibliographical references (p. 185-187). A general chemical kinetics program is described for complex, homogeneous ideal-gas reactions in any chemical system. Its main features are flexibility and convenience in treating many different reaction conditions. The program solves numerically the differential equations describing complex reaction in either a static system or one-dimensional inviscid flow. Applications include ignition and combustion, shock wave reactions, and general reactions in a flowing or static system. An implicit numerical solution method is used which works efficiently for the extreme conditions of a very slow or a very fast reaction. The theory is described, and the computer program and users' manual are included. System requirements: Adobe Acrobat Reader. [electronic resource] |
| 出版: | Portland, Or. : Pacific Northwest Forest and Range Experiment Station, U.S. Dept. of Agriculture |
| 附註: | Cover title. Bibliography: p. 10 |
| 出版: | [Saint Paul, Minn.] : North Central Forest Experiment Station, Forest Service, U.S. Dept. of Agriculture |
| 附註: | Cover title. Includes bibliographical references. |
| 出版: | Washington, D.C. : [Springfield, Va. : National Aeronautics and Space Administration ; For sale by the National Technical Information Service |
| 附註: | Prepared under contract no. NAS 1-10521 at CAED Corporation for Langley Research Center. "March 1972." Cover title. Includes bibliographical references (p. 251-257). |
| 出版: | Washington, D.C. : Springfield, Va. : National Aeronautics and Space Administration ; For sale by the National Technical Information Service [distributor] |
| 附註: | "NASA CR-1999." "May 1972." Cover title. Includes bibliographical references (p. 98). Porous metal sheet with controlled permeability was made by space winding and diffusion bonding fine wire. Two iron-chromium-aluminum alloys and three-chromium alloys were used: GE 1541 (Fe-Cr-Al-Y), H 875 (Fe-Cr-Al-Si), TD Ni Cr, DH 245 (Ni-Cr-Al-Si) and DH 242 (Ni-Cr-Si-Cb). GE 1541 and H 875 were shown in initial tests to have greater oxidation resistance than the other candidate alloys and were therefore tested more extensively. These two materials were cyclic furnace oxidation tested in air at 1800 and 2000 F for accumulated exposure times of 4, 16, 64, 100, 200, 300, 400, 500, and and 600 hours. Oxidation weight gain, permeability change and mechanical properties were determined after exposure. Metallographic examination was performed to determine effects of exposure on the porous metal and electron beam weld joints of porous sheet to IN 100 strut material. Hundred hour stress rupture life and tensile tests were performed at 1800 F. Both alloys had excellent oxidation resistance and retention of mechanical properties and appear suitable for use as transpiration cooling materials in high temperature gas turbine engines. Also available online from the NASA Technical Reports Server (http://ntrs.nasa.gov/). Address as of 04/03/06: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720020169%5f1972020169.pdf. Prepared by the Bendix Corporation, Madison Heights, Mich., for Lewis Research CenterNAS 3-10477 |
| 出版: | Washington, D.C. : National Aeronautics and Space Administration : [For sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151] |
| 附註: | Includes bibliographical references (p. 15). The term digital transducer normally implies the combination of conventional analog sensors with encoders or analog-to-digital converters. Because of the objectionable characteristics of most digital transducers, a program was instituted to investigate the possibility of producing a transducer that is inherently digital, instead of a transducer that is digital in the usual sense. Such a device would have improved accuracy and reliability and would have reduced power and bulk requirements because two processes, sensing and conditioning, would be combined into one processes. A Curie-point-temperature sensor is described that represents realization of the stated goal. Also, a metal-insulator semiconductor is described that does not conform precisely to the program goals but that appears to have applications as a new and interesting transduction device. |
| 出版: | [Washington, D.C.] : U.S. Dept. of Interior, Bureau of Mines |
| 附註: | Bibliography: p. 16 |
| 出版: | Washington : U.S. G.P.O. |
| 附註: | "March 14, 15, and 16, 1972." "Serial no. 92-64." Includes bibliographical references. |
| 出版: | Washington, D.C. : U.S. Dept. of Commerce, National Bureau of Standards |
| 附註: | New syntheses of perfluorostyrene and other highly fluorinated derivatives -- Temperature-, radiation-, and vacuum-resistant magnetic tape -- Conductometric titration cell -- Mill work positioner -- Process for fabricating superconducting microbridges -- Apparatus for displaying average wind vane or other shaft position -- Document numbering machine responsive to a staple in a print area for printing alternate area. |
| 出版: | Washington, D.C. : National Aeronautics and Space Administration : [For sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151] |
| 附註: | Includes bibliographical references (p. 20). The design of a three-phase, 400-Hz, 15-kVA static inverter for motor-starting the 2- to 15-kWe Brayton electrical space power system is described. The inverter operates from a nominal 56-V dc source to provide a 28-V, rms, quasi-square-wave output. The inverter is capable of supplying a 200-A peak current. Integrated circuitry is used to generate the three-phase, 400-Hz reference signals. Performance data for a drive stage that improves switching speed and provides efficient operation over a range of output current and drive supply voltage are presented. A transformerless, transistor output stage is used. |
| 出版: | Washington, D.C. : [Springfield, Va. : National Aeronautics and Space Administration ; For sale by the National Technical Information Service] |
| 附註: | "NASA-TN-D-6814." "June 1972." Cover title. Includes bibliographical references (p. 41-44). Technical note. For single-phase media, the critical discharge velocity, the sonic velocity, and the pressure pulse propagation velocity can be expressed in the same form by assuming isentropic, equilibria processes. In two-phase mixtures, the same concept is not valid due to the existence of interfacial transports of momentum, heat, and mass. Thus, the three velocities should be treated differently and separately for each particular condition, taking into account the various transport processes involved under that condition. This report reviews various attempts to predict the critical discharge rate or the propagation velocities by considering slip ratio (momentum change), evaporation (mass and heat transport), flow pattern, etc. Experimental data were compared with predictions based on various theorems. The importance is stressed of the time required to achieve equilibrium as compared with the time available during the process, for example, of passing a pressure pulse. Also available online. Performed by Lewis Research Center for the National Aeronautics and Space Administration113-31 |
| 出版: | Washington : [U.S. Geological Survey] |
| 附註: | Bibliography: p. 27-28 Bound with this are: Fluvial-sediment discharge to the oceans from the conterminous United States / by W.F. Curtis, J.K. Culbertson, and E.B. Chase ; Ground motion values for use in the seismic design of the trans-Alaska pipeline system / by Robert A. Page [and others] ; Lithium in surficial materials of the conterminous United States and partial data on cadmium / by Hansford T. Shacklette [and others] ; Geologic and hydrologic maps for land-use planning in the Connecticut Valley, with examples from the folio of the Hartford north quadrangle, Connecticut / by Fred Pessl, Jr., William H. Langer, and Robert B. Ryder ; Bibliography of the geology of the Green River Formation, Colorado, Utah, and Wyoming, to March 1, 1973 / by Marjorie C. Mullens ; Estimated use of water in the United States in 1970 / by C. Richard Murray and E. Bodette Reeves ; A review of benthic faunal surveys in San Francisco Bay / by Frederick H. Nichols ; Occurrence and distribution of selected metals in streams near Huntsville, Alabama / by E.R. German and A.L. Knight ; Gold anomaly in soil of the West End Creek area, Yellow Pine district, Valley County, Idaho / by B.F. Leonard ; CRIB--the mineral resources data bank of the U.S. Geological Survey / by James A. Calkins, Olaf Kays, and Eleanor K. Keefer ; Summary of United States mineral resources / by Donald A. Brobst, Walden P. Pratt, and V.E. McKelvey ; United States Geological Survey Alaska program, 1973 ; Mineral resource potential of the Stillwater Complex and adjacent rocks in the northern part of the Mount Wood and Mount Douglas quadrangles, Southwestern Montana / by Norman J. Page and John C. Dohrenwend ; Dissolved-solids discharge to the oceans from the conterminous United States / by Donald K. Leifeste ; Large rivers of the United States / by Kathleen T. Iseri and W.B. Langbein ; Report on water injectivity test, lease OCS-P 0241, well no. B-49-1, Dos Cuadras field, Santa Barbara channel, off California / by Maurice V. Adams ; Liquefaction, flow, and associated ground failure / by T. Leslie Youd ; Effects of the May 5-6, 1973, storm in the greater Denver area, Colorado / by Wallace R. Hansen. |
| 出版: | Washington, D.C. : Springfield, Va. : National Aeronautics and Space Administration ; For sale by the National Technical Information Service [distributor] |
| 附註: | "NASA CR-2000." "April 1972." Cover title. Includes bibliographical references (p. 13). Dynamic response characteristics of six currently used dynamic pressure transducers were investigated by using a large-amplitude sinusoidal-pressure generator. Frequencies between 1 and 15 kilohertz with corresponding peak-to-peak pressure-oscillation amplitudes ranging between 73 and 8 percent of bias pressure and bias pressures between 15 and 300 psia were utilized. Amplitude-ratio data as functions of frequency and pressure level are given for all transducers. The generator design and performance and associated instrumentation are described. Also available online from the NASA Technical Reports Server (http://ntrs.nasa.gov/). Address as of 04/03/06: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720013762%5f1972013762.pdf. Prepared by Battelle, Columbus, Ohio, for Lewis Research CenterNAS 3-11229 |
| 出版: | Washington, D.C. : [Springfield, Va. : National Aeronautics and Space Administration ; For sale by the National Technical Information Service |
| 附註: | Prepared for NASA under contract NAS7-728 by Astro Research Corporation. "February 1972." Cover title. Includes bibliographical references (p. 15). |
| 出版: | Washington, D.C. : National Aeronautics and Space Administration : [For sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151] |
| 附註: | Includes bibliographical references (p. 12). Two Pyrrone materials, pure Pyrrone foam with a density of 481 kg/cu m and hollow glass microsphere-Pyrrone composite with a density of 962 kg/cu m, were tested in the Langley 20-inch hypersonic arc heated tunnel at pressure levels from 0.06 to 0.27 atm and heating rates from 1.14 to 11.4 MW/sq m. The 481-kg/cu m Pyrrone foam was also flight tested as an experiment aboard a Pacemaker test vehicle. The results of the ground tests indicated that the thermal effectiveness of the 481-kg/cu m Pyrrone foam was superior to the 962-kg/cu m glass sphere-Pyrrone composite. The 481-kg/cu m Pyrrone foam had approximately one-half the thermal effectiveness of low density phenolic nylon. The 481-kg/cu m Pyrrone foam experienced random mechanical char removal over the entire range of test conditions. Char thermal property inputs for an ablation computer program were developed from the ground test data of the 481-kg/cu m Pyrrone foam. The computer program using these developed char thermal properties, as well as the measured uncharred material properties, adequately predicted the in-depth temperature histories measured during the Pacemaker flight. |
| 出版: | Washington, D.C. : [Springfield, Va. : National Aeronautics and Space Administration ; For sale by the National Technical Information Service |
| 附註: | Prepared for Langley Research Center by Aerotherm Corporation under contract no. NAS1-10136 "February 1972." Cover title. Includes bibliographical references (p. 49). |
| 出版: | Washington, D.C. : National Aeronautics and Space Administration : [For sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151] |
| 附註: | Includes bibliographical references (p. 14-16). Polyimide resin (PI) was shown to be a suitable binder material for the solid lubricant graphite fluoride, (CF(1.1))n. Comparisons were made to similar tests using PI-bonded MOS2 films, graphite fluoride rubbed films, and MOS2 rubbed films. The results showed that, at any one specific temperature between 25 and 400 C, the wear life of PI-bonded graphite fluoride films exceeded those of the other three films by at least a factor of 2 and by as much as a factor of 60. Minimum friction coefficients for the PI-bonded films were 0.08 for graphite fluoride and 0.04 for MOS2. The rider wear rates for the two PI-bonded films at 25 C were nearly equal. |
| 出版: | Washington, D.C. : National Aeronautics and Space Administration : [For sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151] |
| 附註: | Includes bibliographical references (p. 13-15). Dimensional changes (strain) along the three principal crystal axes of the antiferromagnet CsMnCl3-2H2O are studied as a function of magnetic field and temperature in the antiferromagnetic, spin flopped, and paramagnetic phases. Changes in dimensions through the phase transitions between the magnetic states are examined. By applying the molecular field model and utilizing all available information, magnetic properties of CsMnCl3-2H2O are determined. The possible usefulness of this material in a magnetic refrigeration cycle is evaluated. |
| 出版: | Washington, D.C. : [Springfield, Va. : National Aeronautics and Space Administration ; For sale by the National Technical Information Service] |
| 附註: | Prepared at Lewis Research Center. Cover title. Bibliography: p. 6-7 The ordering in a viscous, nematic, liquid crystal was studied using vanadyl acetyl acetonate and several nitroxides as paramagnetic probes. The ordering curve for VAAC at both K-band and X-band shows a slope discontinuity at a reduced temperature of 0.85. This discontinuity is caused by the tumbling time of the VAAC becoming comparable with the hyperfine splitting. The slope discontinuity is not present in the ordering curves of the nitroxides. The results are taken as evidence counter to the presence of a second-order phase transition. System requirements: Adobe Acrobat Reader. |
| 出版: | Washington, D.C. : National Aeronautics and Space Administration : [For sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151] |
| 附註: | Includes bibliographical references (p. 13). Viscous torque (windage) of a Lundell-shaped rotor having a major diameter of 20.3 cm (8 in.) rotating within a concentric housing was measured at speeds up to 36,000 rpm. The center cylindrical section of the housing was tested with both a smooth surface and axial slots to simulate alternator winding slots. For concentric cylinders, the range of Reynolds numbers was extended to 70,000. Three radial clearances, 1, 2, and 4 mm (0.04, 0.08, and 0.16in.), corresponding to 1, 2, and 4 percent of the rotor radius, were tested. |