| 出版: | Corvallis, Or. : United States Dept. of the Interior, Federal Water Quality Administration, Northwest Region, Pacific Northwest Water Laboratory |
| 出版: | Asheville, N.C. : U.S. Dept. of Agriculture, Forest Service, Southeastern Forest Experiment Station |
| 附註: | Cover title. |
| 出版: | Portland, Or. : U.S. Dept. of the Interior, Federal Water Pollution Control Administration, Northwest Region |
| 出版: | Washington : U.S. Govt. Print. Off. |
| 出版: | Washington : U.S. Govt. Print. Off. |
| 出版: | Washington : U.S. Govt. Print. Off. |
| 附註: | Hearings on S. 1219, 2516, 3093, 3351, 3516 and 4017 [Part 1] March 13 and 14, 1970, Santa Barbara, Calif.--Part 2. July 21 and 22, 1970 |
| 出版: | Washington : U.S. Govt. Print. Off. |
| 附註: | Hearing held in Florence, Or., Aug. 28, 1970 "Serial no. 91-30." |
| 出版: | Upper Darby, Pa. : Northeastern Forest Experiment Station, Forest Service, U.S. Dept. of Agriculture |
| 附註: | Cover title. Bibliography: p. 12 |
| 出版: | Washington, D.C. : National Aeronautics and Space Administration : [For sale by the Office of Technical Services, Dept. of Commerce] |
| 附註: | Prepared at Ames Research Center. "January 1970."--Cover. Major NASA subject terms: Atmospheric Entry; Ballasts (Impedances); Equations Of Motion; Flexibility; Slender Bodies; Coalescing; Damping; Divergence; Linearity; Planar Structures Nonrigidly supported ballast effects on dynamics of slender body descending through atmosphere. |
| 出版: | Washington, D.C. : [Springfield, Va. : National Aeronautics and Space Administration ; For sale by the Clearinghouse for Federal Scientific and Technical Information |
| 附註: | Prepared at Lewis Research Center. "January 1970." Cover title. Includes bibliographical references (p. 16-18). |
| 出版: | Washington : U.S. Govt. Print. Off. |
| 附註: | Hearings held Apr. 16-July 16, 1970 |
| 出版: | Washington, D.C. : National Aeronautics and Space Administration : [For sale by the Clearinghouse for Federal Scientific and Technical, Springfield, Virginia 20230] |
| 附註: | Includes bibliographical references (p. 20). The natural vibration and flutter characteristics of two corrugation-stiffened panels were studied experimentally and theoretically to determine the effects of finite deflectional, rotational, and torsional stiffnesses of the boundary supports. Flutter tests were conducted at a Mach number of 3. The experimental data are compared with results from a flutter theory for orthotropic panels which includes the effects of finite support stiffnesses as well as uniform in-plane loading of the panel. The investigation indicates that finite deflectional, rotational, and torsional stiffnesses of the boundary supports must be accounted for in the theory in order to match experimental natural frequencies of the test panels. However, it is concluded that structural damping (neglected in the theory) strongly influenced the flutter behavior of the test panels. Furthermore, the theory shows that the addition of torsional stiffening at the supports is a definite asset for increasing flutter dynamic pressure and may be extremely important in the design of panels for application at hypersonic speeds where thermal expansion may be desired. System requirements: Adobe Acrobat Reader. [electronic resource] |
| 出版: | Washington, D.C. : [For sale by the Clearinghouse for Federal Scientific and Technical, Springfield, Virginia 22151] : National Aeronautics and Space Administration |
| 附註: | Includes bibliographical references (p. 21). The servosystem design of a high-response airflow bypass valving system for supersonic mixed-compression inlets or other industrial or aerospace pneumatic systems is described. The valve utilizes a multislotted plate to achieve flow area change with minimum stroke and mass of moving parts. The servosystem utilizes a hydraulic piston-in-cylinder actuator close-coupled to a two-stage electrohydraulic servovalve. Using electronic compensation the small-amplitude response of the system, modulating 14 percent of its full flow area, is flat within 0 to -3 dB to 110 Hz. (161 cm [to the second power] ). A mathematical model of the system is presented and analytical responses are compared with experimental data. |
| 出版: | Washington] : U.S. Agricultural Research Service : [For sale by the Supt. of Docs., U.S. Govt. Print. Off. |
| 附註: | Bibliography: p. 10 2 |
| 出版: | Fort Collins, Colo. : Rocky Mountain Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture |
| 附註: | Caption title. Includes bibliographical references (p. 3). |
| 出版: | Washington : U.S. Govt. Print. Off. |
| 附註: | Hearings held Dec. 19, 1968-Mar. 14, 1969 |
| 出版: | Upper Darby, Pa. : Northeastern Forest Experiment Station, Forest Service, U.S. Dept. of Agriculture |
| 附註: | Cover title. Bibliography: p. 13 |
| 出版: | [Washington, D.C.] : U.S. Dept. of the Interior, Office of Saline Water |
| 附註: | Includes bibliographical references. Contract No. 14-01-0001-1832 |
| 出版: | Washington, D.C. : National Aeronautics and Space Administration : [For sale by the Office of Technical Services, Dept. of Commerce] |
| 附註: | Prepared at Ames Research Center. "March 1970."--Cover. Major NASA subject terms: Attitude Control; Dual Thrust Nozzles; Switching Circuits; Vertical Takeoff Aircraft; Aircraft Safety; Mechanical Drives Includes bibliographical references (p. 11). Rapid air switching and low torque nozzle for dual reaction attitude control for jet VTOL aircraft. |
| 出版: | Washington, D.C. : [Springfield, Va. : National Aeronautics and Space Administration ; For sale by the Clearinghouse for Federal Scientific and Technical Information] |
| 附註: | Prepared at Goddard Space Flight Center. Cover title. Bibliography: p. 19 Metal alloys were tested for sliding friction and wear characteristics in vacuum and in air. One purpose was the analysis of variations in the coefficient of friction with changes in air pressure, hardness, and type of alloy. Another purpose was the evolution of a scheme for description of wear patterns. With a Bowden-Tabor apparatus, sliders of various alloys were revolved in contact with a steel plate. Soft and hard steel, titanium, aluminum, copper, and copper-beryllium alloys were tested. Hardness of steel in the plate was varied. Visual and metallographic inspection, as well as study of microhardness traverses from below the wear interface, provided the results. Photomicrographs showing wear in the metal alloys are presented. This paper also provides graphical description of variations in the coefficient of friction. A description of observed wear patterns is accomplished by a scheme of four categories: prow formation, severe rider wear, intermediate rider wear, and mild rider wear. In each category, wear pattern is correlated with a mechanism responsible for its formation. |
| 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. 38-39). This study presents an analysis of the transfer function of head motion to base motion for a thin-walled cylindrical tank partially filled with a liquid. This transfer function is part of the overall structural description for the analysis of POGO type instabilities in rocket vehicles. The analysis utilized the double Laplace transform to achieve a closed form approximate solution. An experimental verification of the analysis was performed using a cylindrical plastic tank containing water. The results clearly demonstrated the importance of considering fluid resonance effects on head to base reponse. Indeed, for at least two fluid heights the fluid mode effects dominated the mechanical modes for this transfer function. |
| 出版: | London : Printed for T. Waller... : and R. Dodsley... |
| 附註: | "A table of the matters contained in Riccoboni's Reflections upon declamation" is contained on the last 16 of 18 unnumbered pages. "[N.B. The following catalogue should have been plac'd immediately after the account of the German theatre.]" "Tragedies and comedies of Hans Sachs from 1516, till 1558," is contained on the first of eighteen unnumbered pages. "Dramatical pieces of Martin Opitz," "Dramatical pieces of Andrew Gryphius," and "Dramatical pieces of Lohenstein" are contained on the second of eighteen unnumbered pages. Luigi Riccoboni (1675-1753)--Enc. Ital., V. XXIX, (1949). Subtitle: Viz. the Italian, Spanish, French, English, Dutch, Flemish, and German theatres; in which is contain'd a review of the manner, persons and character of the actors; intermix'd with many curious dissertations upon the drama; together with two celebrated essays: viz. An essay on action, or, The art of speaking in public; and, A comparison of the ancient and modern drama. |
| 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. Includes bibliographies. 1. Self-acting pad geometry -- 2. Sealing dam -- 3. Mechanical components -- 4. Force balance -- System requirements: Adobe Acrobat Reader. [electronic resource] |
| 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. 33-34). Wall roughness effect on damping of liquid oscillations in rectangular tanks. |
| 出版: | Washington, D.C. : National Aeronautics and Space Administration ; [For sale for Federal Scientific and Technical Information, Springfield, Virginia 22151] |
| 附註: | Includes bibliographical references (p. 19). Combustion efficiency was determined using natural gas fuel over a range of injection temperatures from ambient to 1200' F (922 K). The combustor was comprised of three U-gutter flameholders mounted downstream of a trumpet-shaped diffuser in a rectangulai housing. A simple film-cooled liner was used. Tests were conducted at ambient pressure over a range of fuel-air ratios and combustor reference velocities. Increases in efficiency of more than 40 percentage points were achieved at the higher fuel temperatures. The results are applicable to natural gas afterburner design and to the design of advanced low-pressure-loss primary combustors. |
| 出版: | Washington, D.C. : [Springfield, Va. : National Aeronautics and Space Administration ; For sale by the Clearinghouse for Federal Scientific and Technical Information |
| 附註: | Prepared at Langley Research Center. "February 1970." Cover title. Includes bibliographical references (p. 12). |
| 出版: | Washington, D.C. : National Aeronautics and Space Administration |
| 附註: | "N70-21619." Prepared at George C. Marshall Space Flight Center. Includes bibliographical references (p. 156-163). The stability to small perturbations of shear layer and jet flows (z) in atmospheres with potential temperature (z) is investigated. The problem is reduced to a chardcteristic value problem for the dimensionless wave frequency v which appears in a second-order differential equation with the dependent variable being the horizontal and temporal Fourier transform amplitude of the vertical component of the perturbation momentum vector. Broken-line profiles of E(z) and (z) are used in the analysis of this problem. Integral equations, over the domain of the fluid, which contain both quadratic forms and interfacial contributions, are derived. The interfacial terms vanish for continuous flows, and the theorems of Synge, Howard, and Miles follow. A necessary and sufficient condition for instability is also obtained for continuous flows; however, its usefulness is compromised by integrands which depend on both the basic state flow and the dependent variable of the governing differential equation. |
| 出版: | Washington, D.C. : Springfield, Va. : National Aeronautics and Space Administration ; For sale by the Clearinghouse for Federal Scientific and Technical Information [distributor] |
| 附註: | "NASA CR-1465." "January 1970"--Cover. Includes bibliographical references (p. 99). This report investigates a numerical calculation of viscous compressible fluid flow around right circular cylinder using AFTON 2P computer code. Also available online from the NASA Technical Reports Server (http://ntrs.nasa.gov/). Address as of 11/28/05: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19700008066%5F1970008066.pdf. Prepared by Applied Theory, Inc., Santa Monica, Calif. for George C. Marshall Space Flight CenterNAS 8-18034 |
| 出版: | Berkeley, Calif. : Forest Service, U.S. Dept. of Agriculture, Pacific Southwest Forest and Range Experiment Station |
| 附註: | Caption title. Includes bibliographical references (p. 4). |
| 出版: | Washington, D.C. : [Springfield, Va. : National Aeronautics and Space Administration ; For sale by the Clearinghouse for Federal Scientific and Technical Information |
| 附註: | Prepared at Lewis Research Center. "September 1970." Cover title. Includes bibliographical references (p. 49-50). System requirements: Adobe Acrobat Reader. [electronic resource] |
| 出版: | Washington, D.C. : Springfield, Va. : National Aeronautics and Space Administration ; For sale by the Clearinghouse for Federal Scientific and Technical Information |
| 附註: | "Prepared under contract no. NAS 12-605 by Hartman Systems Company ... for Electronics Research Center." "July 1970"--Cover. Includes bibliographical references (p. 41-45). |
| 出版: | Washington, D.C. : [For sale by the Clearinghouse for Federal Scientific and Technical, Springfield, Virginia 22151] : National Aeronautics and Space Administration |
| 附註: | Includes bibliographical references (p. 52-53). Dynamic stability of space station-centrifuge configuration. |
| 出版: | Washington, D.C. : National Aeronautics and Space Administration : [For sale by the Clearinghouse for Federal Scientific and technical Information, Springfield, Va. 22151] |
| 附註: | Includes bibliographical references (p. 18-19). The design and performance of an experimental dc-dc converter are described. The converter was rated for a power output of 1 kW, with a 150-percent overload rating, and it produced a 200-V, +1-percent, dc output from an input of 56 V, +10 and -20 percent. Voltage regulation is accomplished by varying the duty cycle of the internal 7-kHz quasi-square-wave carrier. Integrated circuits in the control section, a proportional current drive system, and powdered metal cores (Ni-17Fe-2Mo) for the power transformer were some of the design features. The measured efficiency peaked at 92 percent and was 88 percent at 1 kW. The total component weight was 6 lb (2.7 kg). |
| 出版: | Washington, DC : National Aeronautics and Space Administration |
| 附註: | "E-5411." "NASA TN D-5820." "May 1970." Includes bibliographical references (p. 11). Tests were conducted in the NASA spinning-torque apparatus to determine the effect of lubricant additives on the torque of a ball spinning in a nonconforming groove. The base lubricant was a synthetic paraffinic oil to which were added 0.1, 1. 0, and 10 volume percent of either an antiwear or EP additive. The additives used were stearic acid, oleic acid, oleyl phosphate, oleyl phosphite, and zinc dithiophosphate. Under the test conditions, elastohydrodynamic lubrication prevailed with no significant surface interaction. The addition of the antiwear or EP additives in several concentrations to the synthetic paraffinic oil did not change the spinning torque over that obtained with the base fluid. The viscoelastic properties of the base fluid were not changed by the additives tested.--P. [i]. Also available online in PDF from NASA Technical Reports Server. Sponsored by the National Aeronautics and Space Administration (NASA); performed by the Lewis Research Center underWork unit no. 126-1 |
| 出版: | [Washington, D.C.] : U.S. Dept. of Interior, Bureau of Mines |
| 附註: | "January 1970"--Cover. Bibliography: p. 32-33 |
| 出版: | Livermore : Lawrence Radiation Laboratory, University of California |
| 附註: | "UCRL-50820." "TID-4500, UC-35." "February 11, 1970"--Cover. Includes bibliographical references. |
| 出版: | Washington, D.C. : U.S. Dept. of the Interior, Fish and Wildlife Service : U.S. G.P.O. |
| 附註: | Research supported by the United States Department of the Interior, Fish and Wildlife Service. Includes bibliographical references (p. 9). Plate descriptions. Tables. Literature cited. Discussion. Larval development. Hatchling. Egg development. Methods. Introduction. Abstract. Summer flounder eggs and larvae are described from artificially fertilized specimens and from material collected at sea, accompanied by a set of illustrative plates. |
| 出版: | Washington, D.C. : For sale by the Supt. of Docs., U.S. Govt. Print Off. |
| 附註: | "United States Department of Commerce publication." |
| 出版: | Washington, D.C. : U.S. G.P.O. |
| 出版: | Berkeley, Calif. : Forest Service, U.S. Dept. of Agriculture, Pacific Southwest Forest and Range Experiment Station |
| 附註: | Caption title. Includes bibliographical references(p. 3). |
| 出版: | Washington, D.C. : National Aeronautics and Space Administration |
| 附註: | Prepared at Electronics Research Center. "January 1970." Cover title. Includes bibliographical references (p. 19). Alouette 2 satellite ionogram loop shaped traces resulting from oblique radio waves at edge of large scale horizontal depressions of electron density. |
| 出版: | Washington : National Aeronautics and Space Administration : [For sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Va.] |
| 附註: | Work performed at Lewis Research Center. N70-42326 Cover title. Includes bibliographical references (p. 23-24). The feasibility of cooling the first-stage turbine stator directly with cryogenic fuels is investigated based on a numerical heat transfer analysis of methane-and hydrogen-cooled vanes. An insulation barrier between the fuel cooling passages and the external vane surface was required to prevent adverse cooling conditions. The cooling configuration analyzed was that of tubular cooling passages embedded in insulation material surrounded by an outer vane shell. The results indicated that the turbine stator vanes could be adequately cooled with methane or hydrogen fuel at a 2490' F (1639K) local-hot-spot gas temperature. |
| 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. 25-26). An experimental and analytical program was conducted to investigate the longitudinal vibration properties of a two-stage full-scale launch vehicle loaded with various amounts of simulated propellants. A two-dimensional finite-element mathematical model formulated from vehicle physical parameters and experimental results was the basis for free-and forced-vibration analyses. Good agreement was obtained between the measured and predicted responses. Vector-response plots enhanced the interpretation of experimental and forced-vibration analytical results. Proper identification and correlation of the modes required a knowledge of the accelerations along the length of the vehicle, accelerations of specific components such as the engines and the turbopump, and pressures at the top and bottom of the propellant tanks. |
| 出版: | Washington, D.C. : [Springfield, Va. : National Aeronautics and Space Administration ; For sale by the Clearinghouse for Federal Scientific and Technical Information |
| 附註: | Prepared for NASA under contract no. NASW-1608 by Hydronautics, Inc. "September 1970." Cover title. Includes bibliographical references (p. 35-39). |