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  • Chemistry  (25)
  • AERODYNAMICS  (6)
  • Chemical Engineering  (6)
  • 1995-1999  (7)
  • 1985-1989  (20)
  • 1925-1929  (3)
  • 1900-1904  (1)
Collection
Keywords
Publisher
Years
Year
  • 1
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    Rotor wake characteristics of a transonic axial-flow fan (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: AERODYNAMICS
    Type: AIAA Journal (ISSN 0001-1452); 24; 1802-181
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Vortex shedding in high-speed compressor blade wakes (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The wakes of highly loaded compressor blades are generally considered to be turbulent flows. Recent work has suggested that the blade wakes are dominated by a vortex streetlike structure. The experimental evidence supporting the wake vortex structure is reviewed. This structure is shown to redistribute thermal energy within the flowfield. The effect of the wake structure on conventional aerodynamic measurements of compressor performance is noted. A two-dimensional, time-accurate, viscous numerical simulation of the flow exhibits both vortex shedding in the wake and a lower-frequency flow instability that modulates the shedding. The numerical results are shown to agree quite well with the measurement from transonic compressor rotors.
    Keywords: AERODYNAMICS
    Type: Journal of Propulsion and Power (ISSN 0748-4658); 4; 236-244
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Active suppression of compressor instabilities (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A strategy is proposed for controlling aerodynamic instabilities which limit the useful range of both axial and centrifugal turbomachines. Both local and global instabilities (incipient rotating stall and surge) are analyzed. A theory is developed which shows how an additional disturbance, driven from real time data measured within the machine, can be generated so as to realize a device with characteristics fundamentally different from those of the turbomachine without control; for the particular compressor analyzed, the control led to a 20 percent increase in the extent of the stable operating range. The use of structural dynamics to enhance stability is also discussed.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 86-1914
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Rotor wake characteristics of a transonic axial flow fan (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: State of the art turbomachinery flow analysis codes are not capable of predicting the viscous flow features within turbomachinery blade wakes. Until efficient 3D viscous flow analysis codes become a reality there is therefore a need for models which can describe the generation and transport of blade wakes and the mixing process within the wake. To address the need for experimental data to support the development of such models, high response pressure measurements and laser anemometer velocity measurements have been obtained in the wake of a transonic axial flow fan rotor.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 85-1133
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Active suppression of aerodynamic instabilities in turbomachines (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Keywords: AERODYNAMICS
    Type: Journal of Propulsion and Power (ISSN 0748-4658); 5; 204-211
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Rotor wake characteristics of a transonic axial flow fan (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: State of the art turbomachinery flow analysis codes are not capable of predicting the viscous flow features within turbomachinery blade wakes. Until efficient 3D viscous flow analysis codes become a reality there is therefore a need for models which can describe the generation and transport of blade wakes and the mixing process within the wake. To address the need for experimental data to support the development of such models, high response pressure measurements and laser anemometer velocity measurements were obtained in the wake of a transonic axial flow fan rotor.
    Keywords: AERODYNAMICS
    Type: NASA-TM-87073 , E-2644 , USAAVSCOM-TR-85-C-8 , NAS 1.15:87073 , AIAA PAPER 85-1133 , Joint Propulsion Conference; Jul 08, 1985 - Jul 10, 1985; Monterey, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
    Electronic Resource
    Electronic Resource
    Studies on the chemical syntheses and on the characteristics of polyaniline derivatives (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 33 (1995), S. 1227-1234 
    Details
    ISSN: 0887-624X
    Keywords: polyanilines ; derivatives ; chemical synthesis ; oxidation state ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Syntheses of parent polyaniline and methyl, methoxy, and ethoxy ortho-substituted polyanilines were performed using the conventional chemical methodology and monitored using the new open-circuit-potential (Voc) profile technique. The intermediate pernigraniline oxidation state was identified and isolated at the Voc maximum (A) during the conventional chemical synthesis of poly(o-methoxyaniline) in the emeraldine oxidation state. The introduction of the substituent on the aniline ring leads to longer polymerization times and lower Voc values. Syntheses in the presence of two different monomers in solution were also investigated and showed preferential polymerization of the monomer with the lowest Voc potential. All polymers produced were characterized by elemental analysis, gel permeation chromatography, UV-VIS spectroscopy, and cyclic voltammetry. The influence of the substituent on the Voc profile and on the polymer characteristics are rationalized in terms of steric and electronic effects. © 1995 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1995.080330805
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Geschwindigkeit der chemischen Selbsterhitzung. (Adiabatische Reaktionskinetik) (1904)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 42 (1904), S. 341-352 
    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.19040420124
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  • 9
    Electronic Resource
    Electronic Resource
    Studies of the effect of fiber surface and matrix rheological properties on nonwoven reinforced elastomer composites (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 57 (1995), S. 751-765 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The influence of fiber type and fiber-surface properties on matrix flow behavior was investigated using structural reaction injection-molding (SRIM). The influence of fiber type, fiber-surface properties, and matrix type on strength properties in elastomeric composites reinforced with nonwoven fibrous structures was investigated using tensile tests on elastomer composite samples from SRIM and latex coagulation (LC) fabrication methods and the microbond strength method on individual fibers. The fibers used were PET, LLDPE, and p-aramid. Fibers were treated with epoxy, styrene, and isocyanate derivatives, which make the surface chemically reactive. Treatments were also made with NaOH and a copolymer of polyester and polyol ether, causing a change in the fiber surface energy. The matrix types were polyurethane elastomer and natural rubber. The results show that the surface treatments which produced a change in the surface energy influenced the flow rate of the matrix polymer during the composite fabrication process. The treatments resulted in chemically reactive fiber surfaces which improved the fiber-matrix bond strength without affecting the Young's modulus of the composite material. Good correlation was found between bond strength and surface energy including the dispersive component of surface energy in the case of polyurethane elastomer and surface-modified PET fibers. The age of the polyurethane matrix has a marked influence on the bond strength. The fiber volume fraction in composites has a strong influence on the Young's modulus of the elastomer composite. © 1995 John Wiley & Sons, Inc.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1995.070570610
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  • 10
    Electronic Resource
    Electronic Resource
    The Importance of Magnetic Coupling Through Atoms with Large Spin Densities - Structure and Magnetic Properties of meso-Tetrakis-(4′-tert-Butylphenyl)Porphinatomanganese(III) Hexacyanobutadienide, [MnIIITtBuPP]+[C4(CN)6].- (1997)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 3 (1997), S. 138-142 
    Details
    ISSN: 0947-6539
    Keywords: electron transfer ; magnetic properties ; metalloporphryins ; polymers ; spin density ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: [MnIIITtBuPP]+[C4(CN)6].- · 5PhMe [MnIIITtBuPP = meso-tetrakis-(4′-tert-butylphenyl)porphinatomanganese(III)] has been prepared and structurally and magnetically characterized. The uniform, linear-chain (1-D) coordination polymer comprises alternating cations and anions. The bond lengths in planar ion [C4(CN)6].-]'- are 1.377(10) (CC-CC), 1.418(7) (C-CCC), 1.414 (C-CN), 1.457 (C-CNMn), 1.150 (C≡N), and 1.134 Å (C = NMn). The Mn-N-C angle is 172.3(4)°, and the intrachain Mn  -  Mn separation is 10.685 Å. Each [C4(CN)6].-]' unit is bonded to two MnIII atoms through the interior nitrogen atoms in a trans-μ2-N-σ manner with N-Mn bond lengths of 2.353 Å. The ṽCN absorptions are at 2217 (w, br) and 2190 (m) cm-1. Above 50 K the magnetic susceptibility of [MnIIITtBuPP]+[C4(CN)6].- can be fitted to the Curie-Weiss expression, χ∝1(T - θ), with an effective θ of -13 K. This is consistent with weak antiferromagnetic coupling, which is in contrast to the effective θ of +67 K for the uniform chain [MnIIIOEP]+[C4(CN)6].- [OEP = octaethylporphinato]. Here, the [C4(CN)6].-'- units are bonded to the MnIII centers through endo CN nitrogen atoms in a similar trans-μ2 manner. Density functional theory MO calculations reveal that the spin density of the CN nitrogen atom bound to [MnIIITtBuPP]+ (0.019 μBÅ-3) is significantly lower than that of the N atom bound to [MnIIIOEP]+ (0.102 μBÅ-3). This is consistent with the reduced spin coupling observed for [MnIIITtBuPP]+[C4(CN)6].-with respect to [MnIIITtBuPP]+[C4(CN)6].-, as evidenced by the lower θ value. The different orientations of the [C4(CN)6].- units - almost perpendicular (84.72°) for [MnIIITtBuPP]+[C4(CN)6].- and substantially tilted (32.1°) for [MnIIIOEP]+ [C4(CN)6].- may also contribute to the poorer overlap and weaker spin coupling. Hence, binding between sites with large spin densities is needed to stabilize strong ferromagnetic coupling.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.19970030121
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