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  • 1
    Electronic Resource
    Electronic Resource
    Isentropic compressibilities of univalent electrolytes in methanol at 25°C (1984)
    Springer
    Journal of solution chemistry 13 (1984), S. 699-720 
    Details
    ISSN: 1572-8927
    Keywords: Apparent molar isentropic compressibility ; apparent molar volume ; electrolytes ; tetraalkylammonium ions ; tetraphenylphosphonium ion ; methanol ; single ion values ; Debye-Huckel limiting law
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A flow densimeter and an ultrasonic sound velocimeter have been used to measure densities and isentropic compressibilities of solutions of LiBr, NaCl, NaBr, Nal, KF, KCl, KBr, Kl, RbBr, Rbl, CsF, CsBr, Ph 4 PBr, and NaBPh 4 in anhydrous methanol at 25°C. the latter two electrolytes were also investigated in water at 25°C. Concentrations ranged from about 0.005 m to above 0.25m, solubility permitting. Apparent molar isentropic compressibilities, KS,ϕ, have been calculated and extrapolated to infinite dilution to obtain K S,ϕ o . The K S,ϕ o values in methanol are all negative, and significantly more negative than the corresponding data in water. Additional data from the literature for acetonitrile and ethanol solutions show that K S,ϕ o for the alkali metal halides become more negative in direct proportion to increasing solvent isentropic compressibility. Furthermore, the dependence of K S,ϕ o in ionic size also varies in proportion to solvent isentropic compressibility. An explanation of this behavior is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00649010
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    Paper (German National Licenses)
    Fulltext
  • 2
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    An expert system for spectroscopic analysis of rocket engine plumes (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The expert system described in this paper analyzes spectral emissions of rocket engine exhaust plumes and shows major promise for use in engine health diagnostics. Plume emission spectroscopy is an important tool for diagnosing engine anomalies, but it is time-consuming and requires highly skilled personnel. The expert system was created to alleviate such problems. The system accepts a spectral plot in the form of wavelength vs intensity pairs and finds the emission peaks in the spectrum, lists the elemental emitters present in the data and deduces the emitter that produced each peak. The system consists of a conventional language component and a commercially available inference engine that runs on an Apple Macintosh computer. The expert system has undergone limited preliminary testing. It detects elements well and significantly decreases analysis time.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: ; : Review of progress
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    NASA Data Acquisitions System (NDAS) Software Architecture (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-27
    Description: The NDAS Software Project is for the development of common low speed data acquisition system software to support NASA's rocket propulsion testing facilities at John C. Stennis Space Center (SSC), White Sands Test Facility (WSTF), Plum Brook Station (PBS), and Marshall Space Flight Center (MSFC).
    Keywords: Computer Programming and Software
    Type: SPPT-8080-0010 , SEI Architecture Technology User Network (SATURN) Conference; 7-11, May 2012; St. Petersburg, FL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    NASA Data Acquisition System (NDAS) Software Architecture (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Computer Programming and Software
    Type: SSTI-2220-0244-GEN , 27th Aerospace Testing Conference; Oct 16, 2012 - Oct 18, 2012; Los Angeles, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Common Data Acquisition Systems (DAS) Software Development for Rocket Propulsion Test (RPT) Test Facilities - A General Overview (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The advent of the commercial space launch industry and NASA's more recent resumption of operation of Stennis Space Center's large test facilities after thirty years of contractor control resulted in a need for a non-proprietary data acquisition system (DAS) software to support government and commercial testing. The software is designed for modularity and adaptability to minimize the software development effort for current and future data systems. An additional benefit of the software's architecture is its ability to easily migrate to other testing facilities thus providing future commonality across Stennis. Adapting the software to other Rocket Propulsion Test (RPT) Centers such as MSFC, White Sands, and Plumbrook Station would provide additional commonality and help reduce testing costs for NASA. Ultimately, the software provides the government with unlimited rights and guarantees privacy of data to commercial entities. The project engaged all RPT Centers and NASA's Independent Verification & Validation facility to enhance product quality. The design consists of a translation layer which provides the transparency of the software application layers to underlying hardware regardless of test facility location and a flexible and easily accessible database. This presentation addresses system technical design, issues encountered, and the status of Stennis' development and deployment.
    Keywords: Computer Programming and Software
    Type: SSTI-2220-0244-GEN , 27th Aerospace Testing Conference; Oct 16, 2012 - Oct 18, 2012; Los Angeles, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Common Data Acquisition Systems (DAS) Software Development for Rocket Propulsion Test (RPT) Test Facilities (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The advent of the commercial space launch industry and NASA's more recent resumption of operation of Stennis Space Center's large test facilities after thirty years of contractor control resulted in a need for a non-proprietary data acquisition systems (DAS) software to support government and commercial testing. The software is designed for modularity and adaptability to minimize the software development effort for current and future data systems. An additional benefit of the software's architecture is its ability to easily migrate to other testing facilities thus providing future commonality across Stennis. Adapting the software to other Rocket Propulsion Test (RPT) Centers such as MSFC, White Sands, and Plumbrook Station would provide additional commonality and help reduce testing costs for NASA. Ultimately, the software provides the government with unlimited rights and guarantees privacy of data to commercial entities. The project engaged all RPT Centers and NASA's Independent Verification & Validation facility to enhance product quality. The design consists of a translation layer which provides the transparency of the software application layers to underlying hardware regardless of test facility location and a flexible and easily accessible database. This presentation addresses system technical design, issues encountered, and the status of Stennis development and deployment.
    Keywords: Computer Programming and Software
    Type: SSTI-2200-0126-DAIS , 27th Aerospace Testing Seminar; Oct 16, 2012 - Oct 18, 2012; Los Angeles, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    NDAS Hardware Translation Layer Development (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The NASA Data Acquisition System (NDAS) project is aimed to replace all DAS software for NASA s Rocket Testing Facilities. There must be a software-hardware translation layer so the software can properly talk to the hardware. Since the hardware from each test stand varies, drivers for each stand have to be made. These drivers will act more like plugins for the software. If the software is being used in E3, then the software should point to the E3 driver package. If the software is being used at B2, then the software should point to the B2 driver package. The driver packages should also be filled with hardware drivers that are universal to the DAS system. For example, since A1, A2, and B2 all use the Preston 8300AU signal conditioners, then the driver for those three stands should be the same and updated collectively.
    Keywords: Computer Programming and Software
    Type: SSTI-8060-0002
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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