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  • INSTRUMENTATION AND PHOTOGRAPHY  (3)
  • MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT  (3)
  • AEROSPACE MEDICINE  (2)
  • ELECTRONICS AND ELECTRICAL ENGINEERING  (2)
  • LIFE SCIENCES (GENERAL)  (2)
  • 1985-1989  (2)
  • 1975-1979  (8)
  • 1970-1974  (2)
Collection
Keywords
Years
Year
  • 1
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    A diode-quad bridge circuit for use with capacitance transducers (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments; 44; Oct. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Effects of simulated weightlessness on regional blood flow specifically during cardiovascular stress (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Significant changes in the cardiovasular system of humans and animals have been observed following exposure to prolonged periods of weightlessness during space flight. Although adaption to weightlessness is relatively uncomplicated, marked changes in cardiovascular deconditioning become evident upon return to normal gravity, including orthostatic hypotension and tachycardia. Some evidence that myocardial degeneration occurs has been demonstrated in animals who have been immobilized for two months. Also, evidence of possible loss of myocardial mass following manned space flight has been obtained by means of echocardiographic studies. These findings have serious implications in light of the increasing frequency and duration of Space Shuttle missions and the prospect of extended space station missions in the future. A number of both military and civilian investigators, including middle-aged scientists, will probably encounter prolonged periods of weightlessness. It has been imperative, therefore, to determine the effects of prolonged weightlessness on cardiovascular deconditioning and whether such effects are cumulative or reversible. The research project conducted under NASA Cooperative Agreement NCC 2-126 was undertaken to determine the effects of prolonged simulated weightlessness on regional blood flow. Research results are reported in the three appended publications.
    Keywords: AEROSPACE MEDICINE
    Type: NASA-CR-177117 , NAS 1.26:177117
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Computer processing of echocardiographic images (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Systems for direct computer acquisition of the echo signal and subsequent computerized echocardiogram image processing were constructed. Such systems were used to generate images unobtainable by other techniques and to automatically perform quantitative measurements of cardiac structures (5,6,7). The techniques used in analyzing echocardiograms are discussed, and the complexity of the problems involved is illustrated. A description of how these problems may be solved is included.
    Keywords: AEROSPACE MEDICINE
    Type: Soc. of Photo-Opt. Instrumentation Engrs. Cardiovascular Imaging and Image Processing; p 37-43
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Development of a new laser Doppler velocimeter for the Ames High Reynolds Channel No. 2 (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A new two-channel laser Doppler velocimeter developed for the Ames High Reynolds Channel No. 2 is described. Design features required for the satisfactory operation of the optical system in the channel environment are discussed. Fiber optics are used to transmit the megahertz Doppler signal to the photodetectors located outside the channel pressure vessel, and provision is made to isolate the optical system from pressure and thermal strain effects. Computer-controlled scanning mirrors are used to position the laser beams in the channel flow. Techniques used to seed the flow with 0.5-micron-diam polystyrene spheres avoiding deposition on the test-section windows and porous boundary-layer removal panels are described. Preliminary results are presented with a discussion of several of the factors affecting accuracy.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-86772 , REPT-85289 , NAS 1.15:86772
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Diode-quad bridge circuit means (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Diode-quad bridge circuit means is described for use as a transducer circuit or as a discriminator circuit. It includes: (1) a diode bridge having first, second, third, and fourth bridge terminals consecutively coupled together by four diodes polarized in circulating relationship; (2) a first impedance connected between the second bridge terminal and a circuit ground; (3) a second impedance connected between the fourth bridge terminal and the circuit ground; (4) a signal source having a first source terminal capacitively coupled to the first and third bridge terminals, and a second source terminal connected to the circuit ground; and (5) an output terminal coupled to the first bridge terminal and at which an output signal may be taken.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Diagnostic accuracy of an ultrasonic multiple transducer cardiac imaging system (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An ultrasonic multiple-transducer imaging system for intracardiac structure visualization is developed in order to simplify visualization of the human heart in vivo without radiation hazard or invasion of the body. Results of the evaluation of the diagnostic accuracy of the devised system in a clinical setting for adult patients are presented and discussed. Criteria are presented for recognition of mitral valva prolapse, mitral stenosis, pericardial effusion, atrial septal defect, and left ventricular dyssynergy. The probable cause for false-positive and false-negative diagnoses is discussed. However, hypertrophic myopathy and congestive myopathy were unable to be detected. Since only qualitative criteria were used, it was not possible to differentiate patients with left ventricular volume overload from patients without cardiac pathology.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: American Heart Journal; 90; Sept
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Effect of varying differentiator frequency response on recorded peak dP/dt (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Dogs were used to study the effects of varying the differentiator cutoff frequency on the recorded peak first derivative of left ventricular pressure with respect to time (dP/dt), using high-precision solid-state pressure transducers and recording equipment. In canine hearts with a basic periodicity of 1 to 3 Hz, the differentiator frequency response required to record an accurate peak dP/dt is found to be influenced by the value of peak dP/dt. At peak dP/dt ranging from 1500 to 9000 mm Hg/sec (200 and 1200 kPa/sec), a differentiator cutoff frequency of at least 90 Hz was required to record accurately peak dP/dt.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: Cardiovascular Research; 9; May 1975
    Format: text
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  • 8
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    Cardiac chamber size and volume - Echographic measurement of cardiac chamber dimensions, volume and ventricular function (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Format: text
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  • 9
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    Diode-quad bridge circuit means (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A transducer and frequency discriminator circuit is described including a four-terminal circulating diode bridge, a first pair of capacitors connected in series across two terminals of the bridge, and a second pair of capacitors, or other impedance elements, connected in series across the other two terminals of the bridge. A source of balanced alternating electrical energy for energizing the circuit is coupled between the commonly connected plates of the first pair of capacitors and the commonly connected plates of the second pair of capacitors. Due to the operation of the diode bridge, the sum of the resultant charges developed on the first pair of capacitors is proportional to the relationship between the respective capacitors of the second pair, and consequently, an output voltage taken across the first pair of capacitors will be proportional to that relationship.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    The user's view of commercially available medical technology (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The potential user of new medical equipment for imaging the cardiovascular system is often faced with the problem of deciding whether or not to accept a new piece of equipment or a new technological concept into the practice of cardiology. Considerations for acquiring new medical technology are discussed in some detail. Acquisition of new technology should depend on whether the equipment provides more and relevant clinical data, is for research or for limited use, is properly engineered for patient use, presents information in easily storable and retrievable form, is tested and validated clinically, is fabricated by a reliable manufacturer, is cost effective, and may be readily replaced by a new technology.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: Conference on Cardiovascular imaging and image processing: Theory and practice - 1975; Jul 10, 1975 - Jul 12, 1975; Stanford, CA
    Format: text
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    NASA TECHNICAL REPORTS
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