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  • 1
    Electronic Resource
    Electronic Resource
    Nuclear magnetic relaxation in polymer melts and solutions (1962)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 59 (1962), S. 301-316 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Nuclear magnetic relaxation times have been studied in some polymer liquids and solutions. The nonexponential decay of the transverse magnetization has been ascribed to the distribution of molecular weights. The use of such measurements as a means of determining average molecular weights and distributions is discussed. A preliminary application of this use is made for polyethylene. The implications of nuclear magnetic relaxation measurements are discussed in terms of molecular motional processes of the polymer chains.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1962.1205916808
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Recent advances in the NMR of solid polymers (1981)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science: Macromolecular Reviews 16 (1981), S. 295-366 
    Details
    ISSN: 0076-2083
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 37 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1981.230160105
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  • 3
    Electronic Resource
    Electronic Resource
    Self-diffusion and nuclear relaxation in polyisobutylene (1963)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 1 (1963), S. 1709-1720 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Various self-diffusion and nuclear relaxation experiments are reported for a polyisobutylene of rather low molecular weight, in bulk and in solution. In the bulk, the self-diffusion coefficient obeys the Arrhenius relation, yielding an activation energy of 5.5 kcal./mole. In solution the activation energies are lower, approaching the value for the solvent at low concentration. The self-diffusion coefficient of the polymer at infinite dilution is 1.2 × 10-5 cm.2/sec. in CS2 and 0.44 × 10-5 cm.2/sec. in CCl4. The ratio is close to the inverse ratio of the solvent viscosities. Measurements of self-diffusion of the solvent have been made for cyclohexane in polyisobutylene. A simple interpretation of the data in terms of Stokes-Einstein models yields molecular dimensions which are too small by a factor of two or three.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1963.100010523
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  • 4
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    System providing limit switch function with simultaneous absolute position output (2006)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: A limit and position sensing system includes a sensor assembly and an emitter. The sensor assembly includes first and second electrical conductors arranged in opposing parallel planes. The first electrical conductor is coiled outwardly from either end thereof in a clockwise fashion to form a first coil region and a second coil region. The second electrical conductor forms a single coil with portions of the single coil's rings lying between the first end and second end of the first electrical conductor being parallel to an axis of the first electrical conductor's plane. Ferromagnetic material is aligned with the first and second electrical conductors and spans beyond (a) the first and second ends of the first electrical conductor, and (b) the portions of the rings of the second electrical conductor's single coil that lie between the first end and second end of the first electrical conductor. The emitter is spaced apart from the sensor assembly and transmits a periodic electromagnetic wave towards the sensor assembly.
    Keywords: Electronics and Electrical Engineering
    Format: application/pdf
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  • 5
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    Reconfigurable Sensor Monitoring System (2017)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A reconfigurable sensor monitoring system includes software tunable filters, each of which is programmable to condition one type of analog signal. A processor coupled to the software tunable filters receives each type of analog signal so-conditioned.
    Keywords: Electronics and Electrical Engineering
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  • 6
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    Systems, Methods and Apparatus for Position Sensor Digital Conditioning Electronics (2012)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Systems, methods and apparatus are provided through which in some implementations determine the amplitude of an amplitude modulated signal, modulated by the position of an object being sensed. In some aspects, the apparatus accepts an excitation signal and the amplitude modulated signal and divides the amplitude modulated by the excitation signal to produce an output signal that is proportional to the position of the object being sensed. In other aspects, the division is performed only when the excitation signal is non-zero, such as close to the peaks in the excitation signal. In other aspects, the excitation signal and amplitude modulated signal are degraded due to an air gap and the degraded signals are used to correct for amplitude fluctuations due to the air gap, and produce an output signal, tolerant of the air gaps, that is proportional to the position of the object being sensed.
    Keywords: Electronics and Electrical Engineering
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  • 7
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    Arc-Tangent Circuit for Continuous Linear Output (2000)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: A device suitable for determining arc-tangent of an angle theta is provided. Circuitry generates a first square wave at a frequency omega(t) and a second square wave at the frequency omega(t) but shifted by a phase difference equal to the angle theta. A pulse width modulation signal generator processes the first and second square waves to generate a pulse width modulation signal having a frequency of omega(t) and having a pulse width that is a function of the phase difference theta. The pulse width modulation signal is converted to a DC voltage that is a linear representation of the phase difference theta.
    Keywords: Electronics and Electrical Engineering
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Miniature housing with standard addressable interface for smart sensors and drive electronics (2006)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A miniature assembly is disclosed which includes a housing assembly with a cover configured to be sealably secured to a box-like receptacle. The receptacle comprises openings on opposing sides for the seating therein of communications connectors. Enclosed within housing is custom-sized circuit board for supporting, at least, a standard communications interface and at least one electronic device.
    Keywords: Electronics and Electrical Engineering
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  • 9
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    Multi-speed multi-phase resolver converter (1995)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A multiphase converter circuit generates a plurality of sinusoidal outputs of displaced phase and given speed value from the output of an angular resolver system attachable to a motor excited by these multi-phase outputs, the resolver system having a lower speed value than that of the motor. The angular resolver system provides in parallel format sequential digital numbers indicative of the amount of rotation of the shaft of an angular position sensor associated with the angular resolver system. These numbers are used to excite simultaneously identical addresses of a plurality of addressable memory systems, each memory system having stored therein at sequential addresses sequential values of a sinusoidal wavetrain of a given number of sinusoids. The stored wavetrain values represent sinusoids displaced from each other in phase according to the number of output phases desired. A digital-to-analog converter associated with each memory system converts each accessed word to a corresponding analog value to generate attendant to rotation of the angular resolver a sinusoidal wave of proper phase at each of the plurality of outputs. By properly orienting the angular resolver system with respect to the rotor of the motor, essentially ripple-free torque is supplied to the rotor. The angular resolver system may employ an analog resolver feeding an integrated circuit resolver-to-digital converter to produce the requisite digital values serving as addresses. Alternative versions employing incremental or absolute encoders are also described.
    Keywords: Electronics and Electrical Engineering
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  • 10
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    Resolver to 360.degree. linear analog converter and method (2000)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The converter produces a linear analog signal that is linearly proportional to a shaft angle of a resolver over 360.degree.. An excitation cosine signal supplied to the resolver and a response cosine signal received from the output windings of the resolver are converted to logic level signals. Digital logic is performed on the logic level signals in a programmable digital logic device to produce a logic level pulse-width modulated signal. The logic level pulse-width modulated signal is used to control a switch to switch between two reference voltage levels to produce a pulse-width modulated signal, which is filtered and buffered to produce the linear analog signal.
    Keywords: Electronics and Electrical Engineering
    Format: application/pdf
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