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  • AIRCRAFT PROPULSION AND POWER  (12)
  • Analytical Chemistry and Spectroscopy  (7)
  • 1990-1994  (19)
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and 1H, 13C and 31P NMR studies of 2,10-dichloro-6-aryloxy-12H-dibenzo [d,g] [1,3,2]-dioxaphosphocin 6-oxides (1991)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 29 (1991), S. 1140-1146 
    Details
    ISSN: 0749-1581
    Keywords: 1H, 13C and 31P NMR shifts ; 2,10-Dichloro-6-aryloxy-12H-dibenzo[d,g][1,3,2]dioxaphosphocin 6-oxides ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The spectral analyses and syntheses of several novel 2,10-dichloro-6-aryloxy/alkyl-12H-dibenzo [d,g] [1,3,2] dioxaphosphocin 6-oxides have been achieved. Long-range coupling [5J(H,P) = 2.4 Hz] was observed between phosphorus and the bridged methylene protons. Based upon NMR data, a tub-like conformation is proposed for the central eight-membered dioxaphosphocin ring. Long-range 2J(P,O,C) and 3J(P,O,C,C) couplins were determined, as were the 31P chemical shifts for sixteen members of these new heterocycles. A variable-temperature study of one member suggested the presence of a tub form as a reasonable candidate for one major conformer but the presence of other forms was also implied.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260291111
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Mass spectra of t-butyloxycarbonyl (BOC)-protected peptidesIICT communication no. 2287. (1990)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 25 (1990), S. 97-100 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Analytically useful mass spectra of t-butyloxycarbonyl protected tetra- and pentapeptides can be obtained under chemical ionization conditions at a source temperature of 250-270 °C without the use of a reagent gas. The mass spectrum of die thermally labile amino acid arginine could also be recorded under the same conditions.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210250203
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  • 3
    Electronic Resource
    Electronic Resource
    Metastable ion decomposition and collisional activation mass spectra of 1,2,3-triarylpropen-1-onesCDRI Communication No. 4533. (1991)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 26 (1991), S. 298-304 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Substituents have been found to have a marked influence on the metastable ion decompositions and collisionally activated (CA) fragmentations of the M+· ion of a number of 1,2,3-triarylpropen-1-ones. An attempt has been made to confirm the structures of the rearrangement ions, [C14H10]+·, [C13H11]+·, [C13H9]+ and [C12H8]+· by comparison of their CA spectra with those of the corresponding ions produced from reference compounds. The results imply that [C14H10]+· and the M+· ions of phenanthrene and diphenylacetylene have a common structure, [C13H9]+ and the fluorenyl cation have a common structure and [C12H8]+· and biphenylene molecular ion have a common structure. The available data indicate that the ion at m/z 167 consists of a mixture of structures, likely possibilities being diphenylmethyl, phenyltropylium and dihydrofluorenyl cations.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210260422
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  • 4
    Electronic Resource
    Electronic Resource
    Lα/Lβ; and Lα/Lγ x-ray intensity ratios for elements in the range Z = 55-80 (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 19 (1990), S. 23-26 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A systematic study of Lα/Lβ and Lα/Lγ x-ray intensity ratios was undertaken by measuring the characteristic x-ray intensities in 23 elements over the range Z = 55-80, using a 30 mCi 238Pu source of excitation and a high-resolution Si(Li) detector system coupled to a computer-controlled multi-channel analyser. The theoretical predictions due to Scofield were computed for the present energy (weighted average) of 15.28 keV excitation and compared with the experimental values. The experimental values of Lα/Lβ and Lα/Lγ versus Z were fitted to a fourth-degree polynomial, and most probable values of Lα/Lβ and Lα/Lγ at each Z were also determined using this fit.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300190105
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  • 5
    Electronic Resource
    Electronic Resource
    Kβ/Kα ratios and chemical effects in partially filled 3d-shell elements (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 21 (1992), S. 239-243 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The dependence of the Kβ/Kα ratio on the chemical constitution of the x-ray emitting atom of 3d-shell elements. V, Cr, Mn and Fe, was studied employing a high-resolution Si(Li) detector. A maximum deviation of 9% in the Kβ/Kα ratio for the elements V and Mn is found when compared with their respective compounds. The experimental results are found to be consistent with the theoretical values due to Brunner's model.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300210508
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis, 1H, 13C and 31P NMR spectral studies of novel 2-aryloxy/cyclicamino- 3-(4-methylphenyl)- 1H- naphth[ 1,2-e] [1,3,2] oxazaphosphorine 2-oxides/sulphides and 13C NMR data for some 4-substituted-dinaphtho dioxaphosphepin 4-oxides/sulphides (1990)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 28 (1990), S. 908-913 
    Details
    ISSN: 0749-1581
    Keywords: 1H, 13C and 31P NMR chemical shifts 2-aryloxy-3-(4-methylphenyl)- 1H-naphth [1,2-e] [1,3,2] oxazaphosphorine, 2-oxides/sulphides ; 4-substituted-di-naphtho[2,1 -d:1′,2′,-f] [1,3,2]dioxaphosphepin 4-oxides/sulphides ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The syntheses, 1H, 13C and 31P NMR chemical shifts and 13C-31P coupling constants of 2-aryloxy/cyclicamino-2,3-dihydro -3- (4-methylphenyl) -1H - naphth [1,2-e] [1,3,2]oxazaphosphorine 2-oxides/sulphides and the 13C NMR data for 4-substituted - dinaphtho [2,1 -d:1′,2′-f] [1,3,2] dioxaphosphepin 4-oxides/sulphides are reported.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260281013
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  • 7
    Electronic Resource
    Electronic Resource
    Complete 1H and 13C assignment of some cubane derivatives by 2D NMR spectroscopy (1991)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 29 (1991), S. 88-91 
    Details
    ISSN: 0749-1581
    Keywords: Cubanes ; One-bond ; 13C-H coupling constants ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 13C and 1H chemical shift values of 31 cubanes ranging from mono- to hexa-substituted derivatives were recorded in CDCl3 solution and the spectra were fully assigned using, where necessary, 2D 13C-H shift correlated spectra optimized for either one-bond or long-range 13C-H couplings. The one-bond 13C-H coupling constants for the cubyl carbon resonances were also measured and tabulated.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260290117
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  • 8
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    Analysis of aircraft engine blade subject to ice impact (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The ice impact problem on an engine blade made of layered composite is simulated. The ice piece is modeled as an equivalent spherical object and has the velocity opposite to that of the aircraft with direction parallel to the engine axis. Near the impact region and along the leading edge, the blade is assumed to be fully stressed and undergoes large deflection. A specified portion of the blade around the impact region is modeled. The effect of ice size and velocity on the average leading edge strain are investigated for a modified SR-2 model unswept composite propfan blade. Parametric studies are performed to study the response due to ice impact at various locations along the span. Also, the effects of engine speed on the strain and impact displacements are discussed. It is found that for a given engine speed, a critical ice speed exists that corresponds to the maximum strain and this critical speed increases with increase in the engine speed.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: FAA, Ninth DOD(NASA)FAA Conference on Fibrous Composites in Structural Design, Volume 3; p 1319-1331
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Ice-impact analysis of blades (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: A computational capability is described for evaluating the ice-impact on engine blades made from composites. The ice block is modeled as an equivalent spherical object and has the velocity opposite to that of the aircraft with direction parallel to the engine axis. A finer finite element mesh is used for a portion of the blade near the impact region compared to the course mesh for the rest of the blade. The effects of ice size and velocity on the average leading edge strain are evaluated for a simulated unswept composite propfan blade. Parametric studies are performed to assess the blade structural responses due to the ice-impact at various locations along the span. It is found that: (1) for a given engine speed, a critical ice speed exists that corresponds to the maximum strain; and (2) the tip bending type frequencies increase after impact while the torsion frequencies decrease.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: AGARD, Erosion, Corrosion and Foreign Object Damage Effects in Gas Turbines; 12 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Structural tailoring of aircraft engine blade subject to ice impact constraints (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: In this paper, results are presented for the minimum weight design of SR2 unswept blade made of (Titanium/Graphite-Epoxy/Titanium)s fiber composite. The blade which is rotating at high RPM is subject to ice impact. The root chord length, blade thicknesses at five stations, and graphite-epoxy ply orientation are chosen as design variables. The design constraints are placed on the behavior variables: leading edge strain and root damage parameter due to ice impact, maximum post-impact bending stress at the root due to rotation, first three natural frequencies and resonance margin after impact. The method of feasible directions is employed to solve the inequality constrained minimization problem. The effect of ice speed and the ice impact location on the final design are discussed.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: AIAA PAPER 92-4710 , In: AIAA(USAF)NASA/OAI Symposium on Multidisciplinary Analysis and Optimization, 4th, Cleveland, OH, Sept. 21-23, 1992, Technical Papers. Pt. 1 (A93-20301 06-66); p. 197-206.
    Format: text
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