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  • Other Sources  (5)
  • 1
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    Thermal Stability of Otto Fuel Prepolymer (2000)
    In:  Other Sources
    Details
    Publication Date: 2019-08-13
    Description: Otto Fuel II contains a nitrate ester, plasticizer, and 2-NPDA as a stabilizer. Otto Fuel with stabilizers from three vendors was investigated by dynamic and isothermal differential scanning calorimetry (DSC) using samples sealed in a glass ampoule and by Isothermal Microcalorimetry (IMC) using 10 gram samples aged at 75 C for 35 days. DSC kinetics did not show differences between the stabilizer; the samples had an activation energy of 36.7 +/- 0.6 kcal/mol. However, IMC analysis was sensitive enough to detect small differences between the stabilizer, namely energy of interaction values of 7 to 14 Joules. DSC controlled cooling and heating at 5 C/min from 30 to -60 to 40 C experiments were similar and showed a crystallization peak at -48 +/- 1 C during cooling, and upon heating there was a glass transition temperature step at approx. -54 +/- 0.5 C and a melting peak at -28 +/- 0.4 C.
    Keywords: Nonmetallic Materials
    Type: JANNAF 29th Propellant Development and Characterization Subcommittee Meeting; 683-717; CPIA-Publ-697|Propellant Development and Characterization; May 08, 2000 - May 12, 2000; Cocoa Beach, FL; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    Thermal Stability of Otto Fuel Prepolymer (2000)
    In:  Other Sources
    Details
    Publication Date: 2019-08-13
    Description: Otto Fuel II contains a nitrate ester, plasticizer, and 2-NDPA as a stabilizer. Otto Fuel with stabilizers from three vendors was investigated by dynamic and isothermal DSC using samples sealed in a glass ampoule and by Isothermal Microcalorimetry (IMC) using 10 gram samples aged at 75 C for 35 days. DSC kinetics did not show differences between the stabilizer; the samples had an activation energy of 36.7 +/- 0.6 kcal/mol. However, IMC analysis was sensitive enough to detect small differences between the stabilizer, namely energy of interaction values of 7 to 14 Joules. DSC controlled cooling and heating at 5 C/min from 30 to -60 to 40 C experiments were similar and showed a crystallization peak at -48 +/- 1 C during cooling, and upon heating there was a glass transition temperature step at approx. -54 +/- 0.5 C and a melting peak at -28 +/- 0.4 C.
    Keywords: Propellants and Fuels
    Type: Safety and Environmental Protection; May 08, 2000 - May 12, 2000; Cocoa Beach, FL; United States|JANNAF 18th Safety and Environmental Protection Subcommittee Meeting; 309-343; CPIA-Publ-698
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Nonlinear optical effects on the surface of acridine yellow-doped lead-tin fluorophosphate glass (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The second- and third-order nonlinear optical properties of acridine yellow-doped lead-tin fluorophosphate (LTF) glass have been directly studied by measurement of surface enhanced second harmonic generation and third harmonic generation. The three photon excitation fluorescence is also observed. Based on these results, the large nonlinearities of the acridine LTF system which is a new nonlinear optical material are experimentally demonstrated.
    Keywords: OPTICS
    Type: Applied Physics Letters (ISSN 0003-6951); 59; 1935-193
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    NASA TECHNICAL REPORTS
  • 4
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    Unknown
    Permeability of unconsolidated and consolidated marine sediments, Gulf of Mexico (1975)
    Crane, Russak & Co.
    In:  Marine Geotechnology, 1 (1). pp. 1-14.
    Details
    Publication Date: 2020-07-09
    Description: Permeability of a large number of natural marine sediment samples from the Gulf of Mexico was determined through the use of laboratory consolidation tests. The samples were divided into the following groups: Group 1, sediment consisting of more than 80% clay (material 2 μm or less in size); Group 2, sediment containing from 60 to 80% clay‐size material; Group 3, silty clays with less than 60% clay; and Group 4, silts and clays that have a significant sand‐size fraction present (more than 5% sand). The permeabilities of the groups ranged from 10−5 to 10−10 cm/s with 35% normal seawater being used as the saturating fluid. A statistical analysis of the natural log of permeability versus porosity was used to develop the permeability prediction equation for each of the groups listed. The equation for Group 1 is k =en(15.05)‐27.37. for Group 2, k=en(14. 18)‐26.50. for Group 3, k= en(15.59)‐26.65. for Group 4 k=en(17.51)‐26.93.and for all data, k = en(14.30)‐26.30; wherc n is the porosity (in decimals) and k is the coefficient of permeability. These equations are useful for predicting changes in permeability with depth in fine‐grained sediments of the Gulf of Mexico. The ability to predict permeability in a continuous sequence, where the deposition history is known, may explain the large variations that we see in the physical properties in sediments similar in grain size and mineralogy.
    Type: Article , PeerReviewed
    Format: text
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  • 5
    facet.materialart.
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    Comparison of vane shear and fall cone strengths of soft marine clay (1997)
    Taylor & Francis
    In:  Marine Georesources & Geotechnology, 15 (1). pp. 67-82.
    Details
    Publication Date: 2018-10-23
    Description: A total of 1,014 measures of sediment shear strengths were measured by means of miniature vane shear and fall cone tests on five gravity cores collected in Eckernfo‐erde Bay, Baltic Sea. Paired t test was used to compare the shear strengths measured by the two methods. It was found that fall cone strength calculated with Wood's K60value (0.29) overestimates the vane shear strength by 0.15 kPa (a = 0.001) and the sample mean of the fall cone strength is 4.1% higher than the mean of the vane shear strength. However, fall cone strength calculated with Hansbo's K60 value (0.24) underestimates the vane shear strength by 0.88 kPa (a = 0.001), and the sample mean of the fall cone strength is 13.8% less than the mean of the vane shear strength. Both calculated fall cone strengths are significantly different from the vane shear strength, with a p value of less than 0.001. Regression analysis of the Echernfoerde Bay data indicates that a new K60 value is 0.275 with a confidence interval (a = 0.01) from 0.2704 to 0.2786. Paired t test shows that there is no significant difference between miniature vane shear and fall cone tests for these samples if the fall cone strength is calculated with K60 = 0.275.
    Type: Article , PeerReviewed
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