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  • 1
    Electronic Resource
    Electronic Resource
    CO2 emission accompanying the fracture of calcite (1991)
    Springer
    Physics and chemistry of minerals 18 (1991), S. 320-325 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract Time resolved mass spectroscopy of the emissions accompanying the fracture of calcite (rhombohedral CaCO3) show that the principle volatile product, CO2, is released in bursts milliseconds after the fracture event. Similar measurements during the abrasion of calcite and during low temperature thermal decomposition of pulverized calcite show similar CO2 bursts. We argue that the observed bursts reflect localized decomposition of the calcite during the relaxation of reversible plastic deformation created by fracture and abrasion. This implies that mechanical, non-thermal processes play an important role in producing the observed decomposition products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00200189
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The interaction of water and Mn with surfaces of CaCO3: An XPS study (1991)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 17 (1991), S. 25-30 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: This paper reports an examination of the chemistry of single-crystal calcite (CaCO3) using x-ray photoelectron spectroscopy (XPS). This calcite cleavage surface was examined as freshly opened in vacuum and after several different treatments, including exposure to water vapor, covered with different amounts of evaporated Mn, ion sputtered and immersed in pure water. Clean and ion-sputtered calcite were not observed to react with water vapor. Ion sputtering caused significant changes to both oxygen and calcium bounding at the surface. However immersion of sputtered calcite in water caused removal of the sputter damage and produced an XPS spectrum nearly indistinguishable from that of the fresh cleavage surface. The shapes and positions of the Mn and O peaks in the spectra of CaCO3 with submonolayer coverages of Mn indicate partial oxiation of the metal as deposited presumably owing to reaction with the calcite surface. Immersion of the Mn-coated calcite in water caused further changes in the Mn peak, suggesting additional oxidation of the Mn.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740170108
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    Paper (German National Licenses)
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  • 3
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    Flight results from the gravity-gradient-controlled RAE-1 satellite (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The in-orbit dynamics of a large, flexible spacecraft has been modeled with a computer simulation, which was used for designing the control system, developing a deployment and gravity-gradient capture procedure, predicting the steady-state behavior, and designing a series of dynamics experiments for the Radio Astronomy Explorer (RAE) satellite. This flexible body dynamics simulator permits three-dimensional, large-angle rotation of the total spacecraft and includes effects of orbit eccentricity, thermal bending, solar pressure, gravitational accelerations, and the damper system. Flight results are consistent with the simulator predictions and are presented for the deployment and capture phases, the steady-state mission, and the dynamics experiments.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA PAPER 86-2140
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Dynamical performance to date of RAE-A /Explorer 38/ (1969)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Scheme for deployment and gravity-gradient capture of RAE-A
    Keywords: SPACE VEHICLES
    Type: NASA-TM-X-63685 , X-723-69-214
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Engineering parameter determination from the radio astronomy explorer /RAE I/ satellite attitude data (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An RAE-I satellite description is given, taking into account a dynamics experiment and the attitude sensing system. A computer program for analyzing flexible spacecraft attitude motions is considered, giving attention to the geometry of rod deformation. The characteristics of observed attitude data are discussed along with an analysis of the main boom root angle, the bending rigidity, and the damper plane angle.
    Keywords: SPACE VEHICLES
    Type: AIAA PAPER 74-789 , Mechanics and Control of Flight Conference; Aug 05, 1974 - Aug 09, 1974; Anaheim, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    'Smart' from a NEEDS perspective (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A description is presented of the characteristics which are considered essential for the NASA information system if it is to satisfy the sensor/user needs of the 1980's. The present data/information (DI) system is a complex arrangement of functions which has evolved to meet the increased demands placed upon it by the changing nature of the space program. Even though today's ground system is handling today's DI flow, it has certain limitations, and in some cases lacks consistency in organization and structure that would allow it to cope with the new requirements. A systematic analysis and overview of the total system is necessary for the planning of an efficient and effective information system for the 1980's. The NASA End-to-End Data System (NEEDS) program is an attempt to significantly increase the effectiveness and efficiency of the system that couples the user of the space data with the sensors.
    Keywords: MATHEMATICAL AND COMPUTER SCIENCES (GENERAL)
    Type: AIAA PAPER 78-1701 , American Institute of Aeronautics and Astronautics and NASA, Conference on ''Smart'' Sensors; Nov 14, 1978 - Nov 16, 1978; Hampton, VA
    Format: text
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  • 7
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    Separation of variables in the special diagonal Hamilton-Jacobi equation: Application to the dynamical problem of a particle constrained on a moving surface (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: For a time-dependent, n-dimensional, special diagonal Hamilton-Jacobi equation a necessary and sufficient condition for the separation of variables to yield a complete integral of the form was established by specifying the admissible forms in terms of arbitrary functions. A complete integral was then expressed in terms of these arbitrary functions and also the n irreducible constants. As an application of the results obtained for the two-dimensional Hamilton-Jacobi equation, analysis was made for a comparatively wide class of dynamical problems involving a particle moving in Euclidean three-dimensional space under the action of external forces but constrained on a moving surface. All the possible cases in which this equation had a complete integral of the form were obtained and these are tubulated for reference.
    Keywords: MATHEMATICS
    Type: NASA-TR-R-405 , G-1077
    Format: application/pdf
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  • 8
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    Proposed gravity-gradient dynamics experiments in lunar orbit using the RAE-B spacecraft (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A series of seven gravity-gradient dynamics experiments is proposed utilizing the Radio Astronomy Explorer (RAE-B) spacecraft in lunar orbit. It is believed that none of the experiments will impair the spacecraft structure or adversely affect the continuation of the scientific mission of the satellite. The first experiment is designed to investigate the spacecraft dynamical behavior in the absence of libration damper action and inertia. It requires stable gravity-gradient capture of the spacecraft in lunar orbit with small amplitude attitude librations as a prerequisite. Four subsequent experiments involve partial retraction, ultimately followed by full redeployment, of one or two of the 230-meter booms forming the lunar-directed Vee-antenna. These boom length change operations will induce moderate amplitude angular librations of the spacecraft.
    Keywords: GEOPHYSICS
    Type: NASA-TM-X-66271 , X-580-73-158
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Proposed gravity-gradient dynamics experiments using the RAE-1 spacecraft (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Gravity gradient dynamics experiments using Radio Astronomy Explorer Satellite in earth orbit
    Keywords: SPACE SCIENCES
    Type: NASA-TM-X-65318 , X-552-70-296
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    A new approach to data management and its impact on frequency control requirements (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A new approach to data management consisting of spacecraft and data/information autonomy and its impact on frequency control requirements is presented. An autonomous spacecraft is capable of functioning without external intervention for up to 72 hr by enabling the sensors to make observations, maintaining its health and safety, and by using logical safety modes when anomalies occur. Data/information are made autonomous by associating all relevant ancillary data such as time, position, attitude, and sensor identification with the data/information record of an event onboard the spacecraft. This record is so constructed that the record of the event can be physically identified in a complete and self-contained record that is independent of all other data. All data within a packet will be time tagged to the needed accuracy, and the time markings from packet to packet will be coherent to a UTC time scale.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: Annual Frequency Control Symposium; May 30, 1979 - Jun 01, 1979; Atlantic City, NJ
    Format: text
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