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  • General Chemistry  (921)
  • STRUCTURAL MECHANICS  (325)
  • GENERAL  (263)
  • Cell & Developmental Biology
  • 1970-1974  (1,708)
  • 1960-1964
  • 1973  (1,708)
Collection
Keywords
Publisher
Years
  • 1970-1974  (1,708)
  • 1960-1964
Year
  • 1
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    Computer cartographics (1973)
    In:  CASI
    Details
    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.
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  • 2
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    Mars radar profiling and sounding study (1973)
    In:  CASI
    Details
    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 1 p
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  • 3
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    Ion Chemistry (1973)
    In:  CASI
    Details
    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 5 p
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  • 4
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    Microwave spectral studies (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 2 p
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  • 5
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    VLBI earth physics (1973)
    In:  CASI
    Details
    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 8 p
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  • 6
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    Atmospheric pollution sensing: Heterodyne spectroscopy (1973)
    In:  CASI
    Details
    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 3 p
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  • 7
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    DSIF radar astronomy (1973)
    In:  CASI
    Details
    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 3 p
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  • 8
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    Ground-based infrared astronomy (1973)
    In:  CASI
    Details
    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 6 p
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  • 9
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    Particle track cosmochronology (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 2 p
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  • 10
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    Microwave surface properties (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 2 p
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  • 11
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    X-ray and gamma-ray astronomy (1973)
    In:  CASI
    Details
    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 2 p
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  • 12
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    Interstellar microwave spectroscopy/observation support (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Progr. Rev.; 2 p
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  • 13
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    Theoretical space plasma physics (1973)
    In:  CASI
    Details
    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 4 p
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  • 14
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    Planetary frost studies (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 3 p
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  • 15
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    Volatile evolution (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 3 p
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  • 16
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    Theoretical studies of planetary atmospheres (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 7 p
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  • 17
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    Atmospheric experiment development (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 4 p
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  • 18
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    Geology/geomorphology image processing (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 3 p
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  • 19
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    Interstellar microwave spectroscopy/engineering support (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 1 p
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  • 20
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    Magnetic resonance studies of geological samples (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 3 p
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  • 21
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    Geology and mineralogy (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: it Ann. Progr. Rev.; 6 p
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  • 22
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    JPL support of ESRO studies (1973)
    In:  CASI
    Details
    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 1 p
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  • 23
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    Interstellar microwave spectroscopy/laboratory program (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 2 p
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  • 24
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    Advanced magnetometer (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 4 p
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  • 25
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    Surface analysis by combined alpha scattering/X-ray fluorescence (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 2 p
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  • 26
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    Electron ionization and collisions in planetary atmospheres (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 7 p
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  • 27
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    Photochemistry of planetary atmospheres (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 2 p
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  • 28
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    Spectral composition of a measuring signal during measurements of vibration rates of a moving body (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: Cybernetics diagnostics of machines and mechanisms using the spectral approach is discussed. The problem of establishing the accuracy of determination of the spectral composition is investigated. In systems with rectilinear or rotary movement, the vibrations appear in the form of movement rate vibrations, which are equivalent to frequency modulation of the signal, in proportion to the mean movement rate of the body. The case of a harmonic signal which reproduces and analyzes the characteristics of the frequency modulated signal is discussed. Mathematical models are developed to show the relationships of the parameters.
    Keywords: STRUCTURAL MECHANICS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 275-278
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  • 29
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    Certain characteristics and capture regions of nonlinear vibrating systems (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: Free vibrations of a system and vibrations which are multiples of them in frequency are discussed. The corresponding periodic forced vibrations of the type n/m (n is the number of periods of disturbance between periods of movement and m is the number of periods of movement in one period of disturbance), generated by a harmonic or close to harmonic disturbance, are propagated close to the corresponding curves of the free vibrations and their frequency multiples. It has been proposed that investigation of transitional modes of motion and capture regions be carried out by precise methods in phase space, with the least number of coordinates. Thus, for example, for nonautonomous second order equations (for example, the Duffing equations), in place of three variables (coordinates, velocity, phases), it is proposed to use two: velocity during transition of the coordinate through zero and phase.
    Keywords: STRUCTURAL MECHANICS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 256-259
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  • 30
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    Transitional modes of motion and capture regions of vibroshock systems (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: A numerical analysis of the transitional modes of motion for a vibroshock system was conducted. The capture regions of the system are emphasized. The three initial parameters for a nonautonomous vibroshock system with one degree of freedom are identified as: (1) coordinates, (2) velocity, and (3) time. Mathematical models are developed to show the relationship of the parameters. Graphs are included to show the nature of the capture regions and to portray the trajectory of motion of mass with time, by solution of differential equations during increase and decrease in time.
    Keywords: STRUCTURAL MECHANICS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 250-255
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  • 31
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    The relationship of transient vibrational processes at a point in a plate to the nature of sudden kinematic disturbances (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: A solution is given to the problem of a transient vibration process in a fastened plate, during a sudden displacement of the edge. Some partial cases of excitation are examined in which the packing can be calculated and the explicit type of change in a deformation over time can be found. Some examples are presented.
    Keywords: STRUCTURAL MECHANICS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 204-207
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  • 32
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    Structural analysis of vibroacoustical processes (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: The method of automatic identification of acoustical signals, by means of the segmentation was used to investigate noises and vibrations in machines and mechanisms, for cybernetic diagnostics. The structural analysis consists of presentation of a noise or vibroacoustical signal as a sequence of segments, determined by the time quantization, in which each segment is characterized by specific spectral characteristics. The structural spectrum is plotted as a histogram of the segments, also as a relation of the probability density of appearance of a segment to the segment type. It is assumed that the conditions of ergodic processes are maintained.
    Keywords: STRUCTURAL MECHANICS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 179-180
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  • 33
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    Use of the dispersion ratio in estimating the nonlinear properties of an object of diagnosis (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: An experimental investigation for estimating the nonlinearity of a diagnostic object was carried out on a single-stage, spur gear reducer. The linearity of the properties of spur gearing (including the linearity of its mode of operation) was tested. Torsional vibrations of the driven wheel and transverse (to the meshing plane) vibrations of the drive wheel on its support were taken as the two outputs of the object to be analyzed. The results of the investigation showed that the degree of nonlinearity of a reducing gear is essentially connected with its operating mode, so that different mathematical models of it can correspond to different values of the system parameters.
    Keywords: STRUCTURAL MECHANICS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 157-159
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  • 34
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    Part 1: The stability of equilibrium shapes of elastic systems (1973)
    In:  CASI
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    Publication Date: 2006-03-01
    Description: The stability of equilibrium shapes of elastic systems is examined. Stability loss in the case of similar equilibrium shapes, the disappearance of stable equilibrium shapes, and the disappearance of any forms of equilibrium are discussed. The error made by Euler in analyzing stability loss is pointed out, and Mises' truss is used as an example of stability loss in the case of similar equilibrium shapes.
    Keywords: STRUCTURAL MECHANICS
    Type: Stability and Oscillation of Elastic Systems: Mod. Concepts, Paradoxes and Errors (NASA-TT-F-751); p 1-183
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  • 35
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    Part 2: Oscillations of elastic systems (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-01
    Description: Problems of oscillations of linear systems are discussed, including systems with a fractional number of degrees of freedom as well as free oscillations of a cantilever in the field of centrifugal forces. Four methods of solving the problem of the action of periodic instantaneous impulses are presented. The Tacoma catastrophe is analyzed and used as an example of aeroelastic oscillations. Problems of nonlinear system oscillations include the vibration maintenance of rotation, the Sommerfeld effect, and self-oscillations of a quasi-system with dry friction.
    Keywords: STRUCTURAL MECHANICS
    Type: Stability and Oscillation of Elastic Systems: Mod. Concepts, Paradoxes and Errors NASA-TT-F-751); p 184-418
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  • 36
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    Identification of an object by input and output spectral characteristics (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: The problem is discussed of identification of a linear object of known structure, the movement of which is described by a system of differential equations of the type y = Ay + Bu, where y is an n-dimensional output vector, u is an m-dimensional vector of stationary, random disturbances (inputs), A and B are matrices of unknown parameters of the dimension, n x n and n x m, respectively. The spectral and reciprocal spectral densities of the inputs and outputs are used as the initial information on the object.
    Keywords: STRUCTURAL MECHANICS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 139-141
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  • 37
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    Investigation of vibrations of working elements of a two coordinate scanner (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: Radial and axial vibration measurements on the scanning disk and the data storage board of an optical-mechanical scanner are evaluated. Statistical processing of the observational data establishes the excitation source and determines the effect of disk torsional vibrations on the data storage board.
    Keywords: STRUCTURAL MECHANICS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 105-106
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  • 38
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    Diagnostics of load vibrations at the inlet of a mechanism (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: The torque of a drive shaft in a magnetic recording device was studied by oscillographic recordings. Statistical evaluation of the dynamic spectral densities showed that the principle source of disturbing forces is loading in the drive shaft radial play.
    Keywords: STRUCTURAL MECHANICS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 103-104
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  • 39
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    Analysis of vibration characteristics of thin plates covered with a thin viscous layer (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: The equation of motion was used to examine the problem of vibrations of a thin elastic plate covered with a thin viscous layer. Mathematical formulation and the solution of the problem are given.
    Keywords: STRUCTURAL MECHANICS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 89-90
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  • 40
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    Experimental estimation of the statistical parameters of vibrations of a shell (using a digital computer), 2 (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: The statistical characteristics of complex variation amplitudes of shells excited by harmonic force sources in the sound frequency range are examined. Vibrations were measured with a multichannel unit, permitting the component values of a complex vibration amplitude for the i-th measurement point to be obtained at each measured point. An estimation was also made of the nature of the vibration field structure.
    Keywords: STRUCTURAL MECHANICS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 68-73
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  • 41
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    Automation of measurement of spatial damping parameters (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: A traveling wave unit was built to process measurement data on spatial damping parameters and to simplify statistical treatment of the results. Mean values of the loss coefficient, lengths of flexual waves, and wave propagation velocities for a given set of discrete functions were determined. Results are given in a table.
    Keywords: STRUCTURAL MECHANICS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 81-82
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  • 42
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    A mathematical modeling method for determination of local vibroacoustic characteristics of structures (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: A method is proposed for determining vibroacoustic characteristics from the results of measurements of the distribution of vibrational energy in a structure. The method is based on an energy model of a structure studied earlier. Equations are written to describe the distribution of vibrational energy in a hypothetical diffuse energy state in structural elements.
    Keywords: STRUCTURAL MECHANICS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 74-77
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  • 43
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    Experimental estimation of the statistical parameters of vibrations of a shell (using a digital computer), 1 (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: The distribution pattern of the amplitudes of vibrations, measured at various points on the surface of a shell, stimulated by a point source of harmonic force in the sound frequency range was studied experimentally. This pattern permits a valid spacing estimate to be carried out of the average structural characteristics of the vibrations, which are used for both estimation of the vibration excitability of the structure and for estimation of the effectiveness of use of a vibration-absorbing covering.
    Keywords: STRUCTURAL MECHANICS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 61-67
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  • 44
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    Statistical parameters of reverberating fields, calculated by computer (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: A method, developed for making measurements in reverberation chambers in the steady state mode, is reported. Spatial distribution patterns of the square of the sound pressure vs type of exciting signal were produced theoretically and checked experimentally in a reverberation chamber. Results of measurements of spatial irregularities of the field with pure tones and with noise bands in the 200 to 2,000 Hz frequency range were used for calculating statistical parameters of the reverbation fields by computer. The calculation program included determination of density probability function, integral distribution pattern, mathematical expectation, normalized dispersion of the mean square of the pressure.
    Keywords: STRUCTURAL MECHANICS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 57-60
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  • 45
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    Investigation of vibrations in electric power transmission lines (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: Research was begun into the dynamic characteristics of wires, including the self-damping properties. A series of wire insulator fastenings, with and without dampers, was also developed.
    Keywords: STRUCTURAL MECHANICS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 48-49
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  • 46
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    Analytic description of vibrations in a piping system with pulsating flow (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: Various calculation schemes were proposed for describing vibrations in a piping system with pulsating flow. Methods were selected and applied according to the type of irregularities examined: concentrated ones, extended ones, or complex ones. The selection of a method also depends on comparability of the extent of the irregularities with the pressure wavelength and velocity in the flow. Relations were found which permit a description of the interaction of a pulsating flow with any irregularity in the system. For complex systems with varying temperatures and some irregularities, relations were obtained, which reflect the varying phase displacement of the forces in these irregularities. The effect of the frictional torque on pipeline supports, in the presence of flexural and torsional vibrations was investigated, on the assumption that the frictional torque depends linearly on the angular velocity.
    Keywords: STRUCTURAL MECHANICS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 51-52
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  • 47
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    Investigation of the reactions of skin panels in relation to duration of acoustical loading (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: Certain characteristics of the reactions of typical skin panels of a passenger aircraft to acoustical loading are being investigated, for development of an objective method of diagnostics for skin condition, under the operations and maintenance sections of civil aviation. There are a number of difficulties connected with the solution of this problem. The reactions of skin panels exposed to the noises of the exhaust jets are dependent on the aircraft operating conditions, the geometric parameters and limiting conditions of the panels.
    Keywords: STRUCTURAL MECHANICS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 41-43
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    The use of a digital computer for calculation of acoustic fields of complex vibrating structures by the reciprocity principle (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: A program was compiled for calculating acoustical pressure levels, which might be created by vibrations of complex structures (an assembly of shells and rods), under the influence of a given force, for cases when these fields cannot be measured directly. The acoustical field is determined according to transition frequency and pulse characteristics of the structure in the projection mode. Projection characteristics are equal to the reception characteristics, for vibrating systems in which the reciprocity principle holds true. Characteristics in the receiving mode are calculated on the basis of experimental data on a point pulse space velocity source (input signal) and vibration response of the structure (output signal). The space velocity of a pulse source, set at a point in space r, where it is necessary to calculate the sound field of the structure p(r,t), is determined by measurements of acoustic pressure, created by a point source at a distance R. The vibration response is measured at the point where the forces F and f exciting the system should act.
    Keywords: STRUCTURAL MECHANICS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 53-56
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    Compensation of vibrations of a unidimensional structure and a plane acoustical field (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: Endless structures are realized in practice, in the presence of loss and to an adequate extent, owing to which, reflections from the edges to the center part of the structure can be disregarded. In the absence of losses, reflections from the boundary frequently have to be taken into account. In this case, besides compensation for waves passing through the boundary, the reciprocal connection system can be used for compensation of the total field ahead of the boundary. In these cases, the system converters can be located in a different manner relative to the boundary and to one another. Each of the locations has inherent peculiarities, which must be taken into account in solving specific problems.
    Keywords: STRUCTURAL MECHANICS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 222-228
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  • 50
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    Active damping of unidimensional structures (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: The vibration characteristics of an unidimensional structure are discussed. The cases considered are: (1) a rigid pipe in which a wave propagates, (2) an infinite string along which a transverse wave propagates, (3) a rod along which longitudinal or torsional columns propagate, and (4) generally a unidimensional propagation of some one mode of vibrations which is nondegenerating with distance. Mathematical models are developed to show the performance of the mechanical devices under various damping conditions.
    Keywords: STRUCTURAL MECHANICS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 216-221
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  • 51
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    Returned lunar samples porphyrin analysis (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 5 p
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  • 52
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    Solar wind data analysis (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 5 p
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  • 53
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    Lunar science studies (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 2 p
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  • 54
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    Microwave Radiometer Development (MRD) (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 2 p
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  • 55
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    Radio Astronomy (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 8 p
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  • 56
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    Enhancement of astronomical images (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 3 p
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  • 57
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    Arecibo data reduction (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 3 p
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  • 58
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    Gamma ray spectroscopy (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 2 p
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  • 59
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    Origin and evolution of asteroids and small bodies (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 2 p
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  • 60
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    High resolution IR stellar spectroscopy (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 5 p
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  • 61
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    Pulsar rotation constancy (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 2 p
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  • 62
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    Lunar sample analysis: Spectral reflectance and verification effects (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 2 p
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  • 63
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    General relativity data analysis (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 8 p
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  • 64
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    Magnetometer data analysis: Post project support (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 7 p
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  • 65
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    Airborne infrared astronomy (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 2 p
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  • 66
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    Infrared spectroscopy (1973)
    In:  CASI
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    Publication Date: 2005-09-05
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    Type: Ann. Progr. Rev.; 2 p
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  • 67
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    DSIF radar astronomy support (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 1 p
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  • 68
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    Optical Astronomy (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 3 p
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  • 69
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    Radar oceanography (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 1 p
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  • 70
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    Electron spin resonance studies of lunar samples (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 2 p
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  • 71
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    Lunar sample: Extinct nuclides (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 2 p
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  • 72
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    AAFE microwave temperature sounder (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 2 p
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  • 73
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    Mars photogeology interpretation (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 3 p
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  • 74
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    Precision lunar ephemeris (1973)
    In:  CASI
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    Publication Date: 2005-09-05
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 5 p
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  • 75
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    Silicon camera development (1973)
    In:  CASI
    Details
    Publication Date: 2005-08-31
    Keywords: GENERAL
    Type: Ann. Progr. Rev.; 5 p
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  • 76
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    A variable step incremental procedure (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Description of a variable step incremental procedure for the solution of nonlinear equations in finite element structural analysis. The proposed procedure is effective in improving the accuracy of the basic incremental technique and in providing, in addition, an accurate estimate of the discretization error. The proposed approach is highly appropriate for solving problems for which the user has no a priori estimate of the step size to use.
    Keywords: STRUCTURAL MECHANICS
    Type: International Journal for Numerical Methods in Engineering; 7; 4, 19; 1973
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  • 77
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    Further discrete variable results for a panel flutter optimization problem (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Numerical solutions are presented for the problem of minimum weight design of a thin one-dimensional, simply supported, solid panel in compression, with one side exposed to a parallel high supersonic air flow. The flutter speed is held fixed and a minimum thickness constraint is imposed.
    Keywords: STRUCTURAL MECHANICS
    Type: International Journal for Numerical Methods in Engineering; 7; 4, 19; 1973
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  • 78
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    Use of three-dimensional photoelasticity in fracture mechanics (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The philosophy of fracture mechanics is reviewed and utilized to formulate a simplified approach to the determination of the stress-intensity factor photoelastically for three-dimensional problems. The method involves a Taylor Series correction for the maximum in-plane shear stress (TSCM) and does not involve stress separation. The results are illustrated by applying the TSCM to surface flaws in bending fields. Other three-dimensional problems solved by the TSCM are cited.
    Keywords: STRUCTURAL MECHANICS
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  • 79
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    Evaluation of fatigue-crack growth rates by polynomial curve fitting (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Fundamental characterization of the constant-amplitude fatigue crack propagation is achieved by an analysis of the rate of change of crack length with change in number of applied loading cycles, defining the rate values such that they are consistent with the basic assumption of smoothness and continuity in the fatigue crack growth process. The technique used to satisfy the analytical conditions and minimize the effects of local material anomalies and experimental errors is that of fitting a smooth curve to the entire set of basic data by least square regression. This yields a well-behaved function relating the number of cycles to the crack length. By taking the first derivative of the function, the crack growth rate is obtained for each point. The class of curve fitting functions used in the analysis is the polynomial of degree n.
    Keywords: STRUCTURAL MECHANICS
    Type: International Journal of Fracture; 9; Mar. 197
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  • 80
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    An improved numerical process for solution of solid mechanics problems (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: This paper gives an overview of the development and status of an improved numerical process for the solution of solid mechanics problems. The proposed process uses a mixed formulation with the fundamental unknowns consisting of both stress and displacement parameters. The problem is formulated either by means of first-order partial differential equations or in a variational form by using a Hellinger-Reissner-type mixed variational principle. For presentation purposes, the components of a numerical process are characterized and the criteria for an ideal process are outlined. Commonly used finite-difference and finite-element procedures are examined in the light of these criteria and it is shown that they fall short in a number of ways. The proposed numerical process, on the other hand, satisfies most of the optimality criteria and appears to be particularly suited for use with the forthcoming generation computers.
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    A refined analysis of composite laminates (1973)
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    Publication Date: 2011-08-16
    Description: The purpose of this paper is to develop a sufficiently accurate analysis, which is much simpler than exact three-dimensional analysis, for statics and dynamics of composite laminates. The governing differential equations and boundary conditions are derived by following a variational approach. The displacements are assumed piecewise linear across the thickness and the effects of transverse shear deformations and rotary inertia are included. A procedure for obtaining the general solution of the above governing differential equations in the form of hyperbolic-trigonometric series is given. The accuracy of the present theory is assessed by obtaining results for free vibrations and flexure of simply supported rectangular laminates and comparing them with results from exact three-dimensional analysis.
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Sound and Vibration; 30; Oct. 22
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  • 82
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    Visoelastic damping in free vibrations of laminates (1973)
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    Publication Date: 2011-08-17
    Keywords: GENERAL
    Type: the Shock and Vibration Inform. Center The Shock and Vibration Bull., Pt. 4; p 163-173
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  • 83
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    Conclusions and recommendations (1973)
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    Publication Date: 2011-08-16
    Description: Conclusions and recommendations are presented for an analysis of the total energy situation; the effect of the energy problem on air transportation; and hydrogen fuel for aircraft. Properties and production costs of fuels, future prediction for energy and transportation, and economic aspects of hydrogen production are appended.
    Keywords: GENERAL
    Type: The Energy Dilemma and Its Impact on Air Transportation; p 119-173
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  • 84
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    The air transportation/energy system (1973)
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    Publication Date: 2011-08-16
    Description: The changing pattern of transportation is discussed, and the energy intensiveness of various modes of transportation is also analyzed. Sociopsychological data affecting why people travel by air are presented, along with governmental regulation and air transportation economics. The aviation user tax structure is shown in tabular form.
    Keywords: GENERAL
    Type: The Energy Dilemma and Its Impact on Air Transportation; p 49-70
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    Vibration characteristics of aluminum plates reinforced with boron-epoxy composite material. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Analytical and experimental data on the vibration characteristics of cantilevered winglike flat trapezoidal aluminum plates are presented. The plates had been reinforced with boron-epoxy composite material which had been placed symmetrically about the plate middle surface. The effect of filament orientation on the mode shapes and frequencies of the first ten modes and on the damping coefficients of several of the lowest frequency modes has been investigated experimentally. Experimental data are compared with results from a finite-element analysis. Stiffness properties of the composite material for use in the analysis were determined from vibration tests of composite reinforced aluminum beams.
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Composite Materials; 7; July 197
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    Urban simulation and gaming: Preliminary experience and perspectives, appendix F (1973)
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    Publication Date: 2011-08-16
    Description: A three-month summer study of gaming, as applied to urban problems, was conducted. The results of the study are presented along with a series of recommendations aimed at guiding the warranted efforts of others to further explore the application of scientific gaming to the solution of some of America's urban problems. Three main topics are considered and are discussed in depth. These include: (1) gaming and urbanology, (2) methodology and lessons, and (3) reforms in the Cities Game.
    Keywords: GENERAL
    Type: Drexel Univ. Res. and Educ. in Management of Large-Scale Tech. Programs; p 140-154
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    Public attitudes toward programs of large-scale technological changes: Some reflections and policy prescriptions, appendix E (1973)
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    Publication Date: 2011-08-16
    Description: The question of how ready the public is for the implementation of large-scale programs of technological change is considered. Four vital aspects of the issue are discussed which include: (1) the ways in which the public mis-perceives the change process, (2) the ways in which recent history impacts on public attitudes, (3) the ways in which the public divides among itself, and (4) the fundamentals of public attitudes towards change. It is concluded that nothing is so critical in the 1970's to securing public approval for large-scale planned change projects as is securing the approval by change-agents of the public.
    Keywords: GENERAL
    Type: Drexel Univ. Res. and Educ. in Management of Large-Scale Tech. Programs; p 128-139
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    The NASA planning process, appendix D (1973)
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    Description: The planning process is outlined which NASA used in making some fundamental post-Apollo decisions concerning the reuseable space shuttle and the orbiting laboratory. It is suggested that the basic elements and principles of the process, when combined, form a useful planning approach for solving urban problems. These elements and principles are defined along with the basic strengths of the planning model.
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    Type: Res. and Educ. in Management of Large-Scale Tech. Programs; p 115-127
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    Fracture analysis of surface- and through-cracked sheets and plates. (1973)
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    Description: The Neuber stress-concentration relation for notches in an elastic-plastic material subjected to shear loading was generalized for a crack in a finite plate subjected to tensile loading. An equation was derived which related the linear elastic stress-intensity factor, the applied stress, and two material parameters. The equation was then used as a two-parameter fracture criterion for surface- and through-cracked specimens. Fracture data from the literature on surface- and through-cracked sheet and plate specimens of steel, titanium alloy, titanium weldment, and aluminum alloy tested at room and cryogenic temperature were analyzed according to the proposed equation. For surface cracks, wide ranges of crack-depth to crack-length ratio and crack-depth to specimen-thickness ratio were considered. For through cracks, wide ranges of crack length and specimen width were also considered.-
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    Assuring reliability program effectiveness. (1973)
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    Publication Date: 2011-08-16
    Description: An attempt is made to provide simple identification and description of techniques that have proved to be most useful either in developing a new product or in improving reliability of an established product. The first reliability task is obtaining and organizing parts failure rate data. Other tasks are parts screening, tabulation of general failure rates, preventive maintenance, prediction of new product reliability, and statistical demonstration of achieved reliability. Five principal tasks for improving reliability involve the physics of failure research, derating of internal stresses, control of external stresses, functional redundancy, and failure effects control. A final task is the training and motivation of reliability specialist engineers.
    Keywords: GENERAL
    Type: Quality Progress; 6; Sept
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    Energy resources (1973)
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    Description: A statistical analysis of the availability of fossil fuels for energy and non-energy production is presented. The cumulative requirements for petroleum, natural gas, and coal are discussed. Alternate forms of energy are described and the advantages and limitations are analyzed. Emphasis is placed on solar energy availability and methods for conversion. The Federal energy research and development funding for energy sources is tabulated.
    Keywords: GENERAL
    Type: TERRASTAR: Terrest. Appl. of Solar Technol. and Res.; 34 p
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  • 92
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    The elastic layer with a cylindrical hole subjected to a nonuniform axisymmetric radial displacement. (1973)
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    Publication Date: 2011-08-16
    Description: A problem in the linear theory of elasticity is considered wherein a layer with a circular cylindrical hole is subjected to a nonuniform axisymmetric radial displacement. The solution utilizes Navier's equations of elasticity which are solved by means of extended Hankel transforms. A special case in which the radial displacement is a linear function of the axial coordinate is presented. Numerical results are given in graphical form for the case when hole radius and layer thickness are equal. The inversion integrals were evaluated numerically using Longman's technique for computing infinite integrals of oscillatory functions.
    Keywords: STRUCTURAL MECHANICS
    Type: Acta Mechanica; 17; 1-2,; 1973
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  • 93
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    A simple method for studying slow crack growth. (1973)
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    Publication Date: 2011-08-16
    Description: A simple, inexpensive method for studying slow crack growth is described. The method entails measurements of load relaxation at constant displacement using a double torsion specimen. It is demonstrated that the data generated using this technique are in excellent agreement with data obtained using the more complex conventional techniques, for a range of materials - steel, titanium, glass, aluminum oxide, PMMA. These encouraging initial results suggest that additional and more detailed studies using this test procedure are merited.
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Testing and Evaluation; 1; July 197
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  • 94
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    Structural optimization by methods of feasible directions. (1973)
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    Publication Date: 2011-08-16
    Description: A general design algorithm based on methods of feasible directions is presented. Zoutendijk's method of feasible directions is first presented as applied to structural design. This method is modified to improve numerical stability of the design process and is then further modified to deal efficiently with infeasible designs. The algorithm requires the analytic gradient of the objective function and the constraint functions which are active at a given stage in the design process. Gradient information is not required for nonactive constraints. Complex constraint functions may be ignored in the initial design stages because violation of these constraints is efficiently overcome later in the design process. The algorithm is demonstrated with elastic design of redundant trusses.
    Keywords: STRUCTURAL MECHANICS
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  • 95
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    Computer based analyses of the response of box type structures to random pressures. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Analysis of the vibration of the internal structure of a relatively simple flight vehicle structural model consisting of a multicellular box in which two parallel outer face plates (skins) are connected together by several internal plates (ribs) which are parallel to each other and normal to the face plates. Such a box is representative of a wing or stabilizer structure. Three representations of the structure were considered in the computation. The simplest model which can account for the coupling between the face plates and the ribs is a two-dimensional assembly of beams. A more realistic, yet still simple, three-dimensional model has been developed using the Rayleigh-Ritz method. The third computational method employed was the NASTRAN finite-element displacement method. The computational results are compared with experimental data.
    Keywords: STRUCTURAL MECHANICS
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  • 96
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    Developing structures technology for the day after tomorrow. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: To prepare for new demands on aircraft structures, NASA has established a number of goals. These include automatic analysis and design, building confidence in advanced composites, improving the technology base for future supersonic and hypersonic vehicles, validating concepts for active controls, developing methods for predicting aircraft loads and aeroelasticity, and generating design methods for assuring structural integrity. Progress made in achieving these goals is discussed in detail.
    Keywords: STRUCTURAL MECHANICS
    Type: Astronautics and Aeronautics; 11; July 197
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  • 97
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    Lowest critical velocity of rotating shafts. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The effect of the gyroscopic moment on the appearance of a first imaginary critical velocity (minimum negative value of lambda) is investigated and shown to have an important effect on the computation of the first critical velocity. A numerical procedure is developed which can be used for overcoming the difficulties arising when the first real and the first imaginary roots are similar in modulus. As an example, a real shaft with two supports was analyzed. For the computation the real shaft was subdivided into ten sections, and for two of them (representing compressor and turbine) the gyroscopic moment was taken into account. The present method is especially useful when high speed computational facilities are not available.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA Journal; 11; June 197
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  • 98
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    Effect of out-of-planeness of membrane quadrilateral finite elements. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Investigation of the effect of using plane quadrilateral membrane elements for modeling nonplanar structures. The effect is assessed by analyzing a simplified finite element model with the aid of the structure network analysis program. The results obtained indicate that the use of planar quadrilateral membrane elements for modeling bending problems can lead to large errors if the four points that define the quadrilateral are not in the same plane.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA Journal; 11; May 1973
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  • 99
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    Mixed finite-difference scheme for analysis of simply supported thick plates. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: A mixed finite-difference scheme is presented for the stress and free vibration analysis of simply supported nonhomogeneous and layered orthotropic thick plates. The analytical formulation is based on the linear, three-dimensional theory of orthotropic elasticity and a Fourier approach is used to reduce the governing equations to six first-order ordinary differential equations in the thickness coordinate. The governing equations possess a symmetric coefficient matrix and are free of derivatives of the elastic characteristics of the plate. In the finite difference discretization two interlacing grids are used for the different fundamental unknowns in such a way as to reduce both the local discretization error and the bandwidth of the resulting finite-difference field equations. Numerical studies are presented for the effects of reducing the interior and boundary discretization errors and of mesh refinement on the accuracy and convergence of solutions. It is shown that the proposed scheme, in addition to a number of other advantages, leads to highly accurate results, even when a small number of finite difference intervals is used.
    Keywords: STRUCTURAL MECHANICS
    Type: Computers and Structures; 3; Sept
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  • 100
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    National energy policy (1973)
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    Publication Date: 2011-08-16
    Description: The efforts of the U.S. government to cope with the national energy crisis are discussed. The provisions of several legislative actions to implement the actions for energy conservation are examined. Immediate conservation measures and the long range planning for energy resources are reported.
    Keywords: GENERAL
    Type: TERRASTAR: Terrest. Appl. of Solar Technol. and Res.; 12 p
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