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  • 1
    Electronic Resource
    Electronic Resource
    Studies on the adiabatic polymerisation of acrylamideThe studies reported here formed part of a paper given at Achema 82 Chemical Engineering Congress, Frankfurt-am-Main. (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 1885-1892 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Kinetic parameters, obtained isothermally, have been used in the quantitative description of the polymerisation of acrylamide under virtually adiabatic conditions. The equations which have been derived relate the temperature rise on reaction to the decrease in reactant concentration during the course of reaction, taking account of the various energies of activation and frequency factors involved, whose values may be chosen as required. The approach used has been to find the value of the overall activation energy which gives the best agreement between theoretical and experimental temperature-time plots. Good agreement has been obtained between these when a value of 74,5 ± 0,9 kJ · mol-1 was chosen for the overall activation energy for the persulfate-initiated polymerisation of acrylamide using a wide range of initiator and monomer concentrations. This gives a value of 135,5 kJ · mol-1 for the activation energy for the thermal decomposition of the persulfate ion, which is in good agreement with the literature. Interesting implications are discussed in the context of the nature of the product formed during the course of the polymerisation.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1983.021840914
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Über die magnetischen Eigenschaften der Legierungen von Mangan, Aluminium und Kupfer (1909)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 63 (1909), S. 349-352 
    Details
    ISSN: 0863-1778
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19090630130
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  • 3
    Electronic Resource
    Electronic Resource
    Über Mangan-Aluminiumkupfer. Bemerkung zu einer Abhandlung (1909)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 65 (1909), S. 110-112 
    Details
    ISSN: 0863-1778
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19090650110
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  • 4
    Electronic Resource
    Electronic Resource
    Multiple product inhibition and growth modeling of clostridium butyricum and klebsiella pneumoniae in glycerol fermentation (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 44 (1994), S. 902-911 
    Details
    ISSN: 0006-3592
    Keywords: product inhibition ; growth modeling ; glycerol fermentation ; 1,3-propanediol ; C. butyricum ; K. pneumoniae ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The inhibition potentials of products and substrate on the growth ofClostridium butyricum and Klebsiella pneumoniae in the glycerol fermentation are examined from experimental data and with a mathematicalmodel. Whereas the inhibition potential of externally added and self-produced 1,3-propanediol is essentially the same, butyric acid produced by the culture is more toxic than that externally added. The same seems to apply for acetic acid. The inhibitory effect of butyric acid is due tothe total concentration instead of its undissociated form. For acetic acid, it cannot be distinguished between the total concentration and the undissociated formThe inhibition effects of products and substrate in the glycerol fermentation are irrespective of the strains, and, therefore, the same growth model can be used. The maximum product concentrations tolerated (critical concentrations C*pi) are 0.35 g/Lfor undissociated acetic acid, 10.1 g/L for total butyric acid, 16.6 g/L for ethanol, 71.4 g/L for 1,3-propanediol, and 187.6 g/L for glycerol, which are applicable to C. butyricum and K. pneumoniae grown under a variety of conditions. For 55 steady-states, which were obtained from different types of continuous cultures over a pHrange of 5.3-8.5 and under both substrate limitation and substrate excess, the proposed growth model fits the experimental data with an average deviation of 17.0%. The deviation of model description from experimental values reduces of 11.4% if only the steady-states with excessive substrate are considered. © 1994 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260440806
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  • 5
    Electronic Resource
    Electronic Resource
    Retention of catechols in capillary electrophoresis with micellar and mixed micellar solutions (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 1 (1989), S. 23-27 
    Details
    ISSN: 1040-7685
    Keywords: capillary ; electrophoresis ; micelles ; mixed micelles ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Zone electrophoresis in capillaries filled with micellar and mixed micellar solutions was examined for the separation of borate-complexed catechols. The mechanism for solute velocity was shown to involve both retention by hydrophobic interaction with the micelles and electrophoretic mobility. Mixed micellar systems involving SDS and SOS surfactants were shown to allow greater selectivity and increased separation efficiency.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mcs.1220010107
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  • 6
    Electronic Resource
    Electronic Resource
    „[Cp*Co=CoCp*]“ ist ein HydridDiese Arbeit wurde durch den Petroleum Research Fund der American Chemical Society und die U.S. National Science Foundation (K.H.T.) sowie durch das U.S. Department of Energy, Division of Basic Energy Sciences, (C.P.C.) gefördert. - Cp* = C5Me5. (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 104 (1992), S. 1364-1366 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19921041009
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  • 7
    Electronic Resource
    Electronic Resource
    “[Cp*Co=CoCp*]” is a HydrideThis work was supported by grants from the Petroleum Research Fund of the American Chemical Society and the U.S. National Science Foundation (KHT) and by the U.S. Department of Energy, Division of Basic Energy Sciences (CPC). Cp* = C5Me5. (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 31 (1992), S. 1341-1343 
    Details
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.199213411
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  • 8
    Electronic Resource
    Electronic Resource
    Ueber zwei aromatische Nitrosoverbindungen (1905)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 38 (1905), S. 1899-1901 
    Details
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.190503802114
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  • 9
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    Development of Hydroxyl Tagging Velocimetry for Low Velocity Flows (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Hydroxyl tagging velocimetry (HTV) is a molecular tagging technique that relies on the photo-dissociation of water vapor into OH radicals and their subsequent tracking using laser induced fluorescence. Velocities are then obtained from time-of-flight calculations. At ambient temperature in air, the OH species lifetime is relatively short (〈50 s), making it suited for high speed flows. Lifetime and radicals formation increases with temperature, which allows HTV to also probe low-velocity, high-temperature flows or reacting flows such as flames. The present work aims at extending the domain of applicability of HTV, particularly towards low-speed (〈10 m/s) and moderate (〈500 K) temperature flows. Results are compared to particle image velocimetry (PIV) measurements recorded in identical conditions. Single shot and averaged velocity profiles are obtained in an air jet at room temperature. By modestly raising the temperature (100-200 degC) the OH production increases, resulting in an improvement of the signal-to-noise ratio (SNR). Use of nitrogen - a non-reactive gas with minimal collisional quenching - extends the OH species lifetime (to over 500 s), which allows probing of slower flows or, alternately, increases the measurement precision at the expense of spatial resolution. Instantaneous velocity profiles are resolved in a 100degC nitrogen jet (maximum jet-center velocity of 6.5 m/s) with an uncertainty down to 0.10 m/s (1.5%) at 68% confidence level. MTV measurements are compared with particle image velocimetry and show agreement within 2%.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NF1676L-22873 , AIAA Aviation 2016; Jun 13, 2016 - Jun 17, 2016; Washington, DC; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Comparisons Between NO PLIF Imaging and CFD Simulations of Mixing Flowfields for High-Speed Fuel Injectors (2017)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: The current work compares experimentally and computationally obtained nitric oxide (NO) planar laser induced fluorescence (PLIF) images of the mixing flowfields for three types of high-speed fuel injectors: a strut, a ramp, and a rectangular flushwall. These injection devices, which exhibited promising mixing performance at lower flight Mach numbers, are currently being studied as a part of the Enhanced Injection and Mixing Project (EIMP) at the NASA Langley Research Center. The EIMP aims to investigate scramjet fuel injection and mixing physics, and improve the understanding of underlying physical processes relevant to flight Mach numbers greater than eight. In the experiments, conducted in the NASA Langley Arc-Heated Scramjet Test Facility (AHSTF), the injectors are placed downstream of a Mach 6 facility nozzle, which simulates the high Mach number air flow at the entrance of a scramjet combustor. Helium is used as an inert substitute for hydrogen fuel. Both schlieren and PLIF techniques are applied to obtain mixing flowfield flow visualizations. The experimental PLIF is obtained by using a UV laser sheet to interrogate a plane of the flow by exciting fluorescence from the NO molecules, which are present in the AHSTF air. Consequently, the absence of signal in the resulting PLIF images is an indication of pure helium (fuel). The computational PLIF is obtained by applying a fluorescence model for NO to the results of the Reynolds-averaged simulations (RAS) of the mixing flow field carried out using the VULCAN-CFD solver. This approach is required because the PLIF signal is a nonlinear function of not only NO concentration, but also pressure, temperature, and the flow velocity. This complexity allows additional flow features to be identified and compared with those obtained from the computational fluid dynamics (CFD) simulations, however, such comparisons are only semiquantitative. Three-dimensional image reconstruction, similar to that used in magnetic resonance imaging, is also used to obtain images in the streamwise and spanwise planes from select cross-stream PLIF plane data. Synthetic schlieren is also computed from the RAS data. Good agreement between the experimental and computational results provides increased confidence in the CFD simulations for investigations of injector performance.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NF1676L-27198 , Propulsion Systems Hazards (PSHS); 4-7 Dec. 2017; Newport News, VA; United States|Joint Subcommittee Meeting; 4-7 Dec. 2017; Newport News, VA; United States|Exhaust Plume and Signatures (EPSS); 4-7 Dec. 2017; Newport News, VA; United States|Programmatic and Industrial Base Meeting; 4-7 Dec. 2017; Newport News, VA; United States|Combustion (CS); 4-7 Dec. 2017; Newport News, VA; United States|Air Breathing Propulsion (APS); 4-7 Dec. 2017; Newport News, VA; United States|Joint Army-Navy-NASA-Air Force (JANNAF) Meeting; 4-7 Dec. 2017; Newport News, VA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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