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  • Aircraft Stability and Control
  • GENERAL
  • Inorganic Chemistry
  • 1995-1999  (56)
  • 1980-1984  (127)
  • 1955-1959  (48)
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Keywords
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Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Das Schwingungsspektrum von α-Te2MoO7 und ein Vorschlag zur Struktur der Telluromolybdate zweiwertiger Kationen (1981)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 476 (1981), S. 214-220 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Vibrational Spectrum of α-Te2MoO7 and a Proposal for the Structure of Telluromolybdates of Divalent CationsInfrared and Raman spectra of α-Te2MoO7 have been recorded and discussed in relation to their known crystalline structure. The comparison of these spectra with those of telluromolybdates of the type MIITeMoO6, allows us to propose a structural model for these phases, which is totally consistent with the spectroscopic findings.
    Notes: Die IR- und Raman-Spektren von α-Te2MoO7 wurden aufgenommen und an Hand der bekannten kristallographischen Daten zugeordnet. Durch Vergleich dieser Spektren mit demjenigen einiger Telluromolybdate des Typs MIITeMoO6 kann für diese Phasen ein Strukturvorschlag gegeben werden, der sich durch die spektroskopischen Daten einwandfrei rechtfertigen läßt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19814760525
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  • 2
    Electronic Resource
    Electronic Resource
    Über Benzal-Derivate des L-Idits (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 2694-2700 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die von E. Fischer und G. Bertrand beschriebenen Tribenzal-L-idite erwiesen sich als identisch mit 1.3;2.4;5.6-Tribenzal-L-idit. Unter wenig abgeänderten Versuchsbedingungen entsteht neben dem Tribenzal-L-idit ein Dibenzal-Derivat, welches einen 2.3.4.5-, wahrscheinlich 2.4;3.5-Dibenzal-L-idit darstellt. Es wird auf den unterschiedlichen Verlauf der Acetalisierung des L-Idits mit Benzaldehyd, bzw. Formaldehyd hingewiesen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19590921103
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  • 3
    Electronic Resource
    Electronic Resource
    Hydrogen Bonding and Conformational Analysis of Chelate-Stabilized Alkoxopalladium(II) Complexes Derived from Amino Alcohol Ligands (1997)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 35-44 
    Details
    ISSN: 0009-2940
    Keywords: Alkoxopalladium(II) ; Conformational analysis ; Hydrogen bonding ; Two-dimensional and cage structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of palladium acetate with two equivalents of di- and triethanolamines RN(CH2CH2OH)2 in the presence of a base affords the new chelate-stabilized alkoxo Pd(II) complexes [Pd(OCH2CH2N(R)CH2CH2OH)2] [R = Me (1), Et (2), n-Bu (3), benzyl (4) or CH2CH2OH (5)]. These N,O-ligated complexes are isolated in high yield as yellow, crystalline solids and are thermally stable despite the presence of several β-hydrogen atoms in the ligand system. Both complexes possess a square-planar palladium coordination geometry with the two oxygen atoms positioned mutually trans. The most notable difference in the molecular structures is that 1 forms a two dimensional network of intermolecular O-H≡O hydrogen bonds, whereas 5 forms intramolecular O-H⃛O hydrogen bonds, which cage the palladium center. In solution 1-4 exist as a diastereoisomeric mixture (a racemic enantiomeric pair SNSN, RNRN and a mesomeric form RNSN) in a 1:1 molar ratio, and this ratio is independent of temperature in nonalcoholic solvents, When complexes 1-4 are dissolved in protic solvents (e.g. MeOH) the diastereomeric excess is temperature-dependent due to an exchange process between the meso diastereoisomer and the (racemic) enantiomeric pair. Thermodynamic parameters for this process in a mixture of MeOH-toluene have been determined with NMR and show this process to be influenced by the steric nature of the alkyl substituent (R) on nitrogen. A conformational analysis based on 1H-NMR coupling constants within the N,O-chelate ring of complexes 1-4 provides details on the solution structure of the ring in both diastereoisomers.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19971300106
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  • 4
    Electronic Resource
    Electronic Resource
    Perfluorovinyl Morpholine and Perfluorovinyl Pyrrolidine with Nucleophiles and ElectrophilesDedicated to Professor Herbert W. Roesky on the Occasion of his 60th Birthday (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1865-1874 
    Details
    ISSN: 0044-2313
    Keywords: Perfluorovinyl amine ; X-ray crystal structure ; nucleophile ; electrophile ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaktion von Perfluorvinyl-Morpholin und Perfluorvinyl-Pyrrolidin mit Nukleophilen und ElektrophilenEs wird die Umsetzung von monofunktionellen und bifunktionellen Nukleophilen sowie des Elektrophils FNO mit Perfluorvinylaminen mitgeteilt. Die Perfluorvinylamine CF=CF2 und CF=CF2 wurden mit Dimethylamin und Diethylamin in Gegenwart kleiner Mengen Wasser umgesetzt zu CHFC(O)N(CH3)2 (1), CHFC(O)N(CH3)2 (2), bzw. CHFC(O)N(C2H5)2 (3). Mit Perfluorvinylpyrrolidin und Perfluorvinylmorpholin ergibt Ethanolamin die cyclischen Produkte CHF (4) bzw. CHF (5). Die Reaktion der Vinylamine mit (CH3)3SiOCH2CF3 in Gegenwart katalytischer Mengen von CsF ergibt cis- (6) und trans- (7) CF=CF(OCH2CF3) sowie cis- (8) und trans-(9) CF=CF(OCH2=CF3). Das elektrophile FNO reagiert langsam mit Perfluorvinylpyrrolidin und Perfluorvinylmorpholin und schneller mit (CH3)3CCF=CF2 zu CF(NO)CF3 (10), CF(NO)CF3 (11) bzw. (CF3)CF(NO)CF3 (12). Die Einkristall-Röntgen-Analyse wird zur Klärung der Produkte der kontrollierten Hydrolyse der Sultone von Perfluorvinylpyrrolidin wie des Sulfonsäureanhydrids C(O)CF2OS(O)2OCF2C(O) (13) eingesetzt. Die Röntgenstruktur von Perfluorbernsteinsäure · Monohydrat (14), die durch Hydrolyse von Perfluorvinylpyrrolidin mit einem Überschuß an Wasser erhalten wurde, wird erstmals mitgeteilt.
    Notes: In this study, both monofunctional and bifunctional nucleophiles, as well as the electrophile FNO, are reacted with perfluorovinyl amines. The perfluorovinyl amines CF=CF2 and CF=CF2 have been reacted with dimethylamine and diethylamine in the presence of small amounts of water to give CHFC(O)N(CH3)2 (1), CHFC(O)N(CH3)2 (2), and CHFC(O)N(C2H5)2 (3). With perfluorovinyl pyrrolidine and perfluorovinyl morpholine, ethanolamine gives the cyclized products CHF (4) and CHF (5), respectively. Reaction of the vinyl amines with (CH3)3SiOCH2CF3 in the presence of catalytic amounts of CsF results in the formation of cis- (6) and trans- (7) CF=CF(OCH2CF3) and cis- (8) and trans- (9) CF=CF(OCH2CF3). The electrophile FNO reacts slowly with perfluorovinyl pyrrolidine and perfluorovinyl morpholine, and more rapidly with (CF3)3CCF=CF2 to give CF(NO)CF3 (10), CF(NO)CF3 (11) and (CF3)3CF(NO)CF3 (12), respectively. Single crystal X-ray analysis is used to confirm the identity of the product obtained from the controlled hydrolysis of the sultone of perfluorovinyl pyrrolidine as the sulfonic acid anhydride C(O)CF2OS(O)2OCF2C(O) (13). The X-ray crystal structure of perfluorosuccinic acid monohydrate (14), which is obtained when the perfluorovinyl pyrrolidine sultone is hydrolyzed in excess water, is also reported for the first time.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956211108
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  • 5
    Electronic Resource
    Electronic Resource
    Die Raman-Spektren der Orthovanadate der Seltenen Erden (1981)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 472 (1981), S. 193-199 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Raman Spectra of the Rare Earth OrthovanadateThe laser-Raman spectra of the tetragonal rare earth orthovanadates of the type LnVO4 (Ln = Pr to Lu) as well as those of ScVO4 and YVO4 has been recorded and interpreted with the aid of both, the site symmetry and the factor group analysis, using also IR data reported previously. The influence of the cations on the internal vibrations of the anion are discussed in detail.
    Notes: Die Laser-Raman-Spektren der tetragonalen Orthovanadate der Seltenen Erden des Typs LnVO4 (Ln = Pr bis Lu) sowie diejenigen von ScVO4 und YVO4 wurden aufgenommen und an Hand einer „Site-Symmetrie“-bzw. Faktorgruppenanalyse gedeutet. Auch Daten früher durchgeführter IR-Messungen wurden herangezogen. Der Einfluß der Kationen auf die inneren Anionenschwingungen wurde eingehend diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19814720123
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  • 6
    Electronic Resource
    Electronic Resource
    Kristall- und Molekülstrukturen von (1-Ferrocenyl-1-oxo-ethyl) Tricarbonylcyclopentadienylwolfram und μ-[(1-oxo-ethyl)cyclopentadienyl](tricarbonylmangan)tricarbonylcyclopentadienylwolfram (1982)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 487 (1982), S. 217-224 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal and Molecular Structures of (1-Ferrocenyl-1-oxo-ethyl)tricarbonylcyclopentadienyltungsten and μ-[(1-oxo-ethyl)cyclopentadienyl] (tricarbonylmangan)tricarbonylcyclopentadienyltungstenX-ray analysis of (1-ferrocenyl-1-oxo-ethyl)tricarbonylcyclopentadienyltungsten C5H5FeC5H4COCH2W(CO)3C 5H5 (I) and μ-[(1-oxo-ethyl)cyclopentadienyl](tricarbonylmangan)tricarbonylcyclopentadienyltungsten (CO)3MnC5H4COCH2W(CO)3C5H5 (II) were carried out. The two compounds crystallize in the triclinic centrosymmetric space group P1 with the lattice parameters a = 12.99 Å, b = 11.409 Å, c = 6.530 Å,α = 90.83°, β = 92.62°, γ = 110.37° for I and a = 6.886 Å, b = 20.860 Å, c = 6.907 Å,α = 97.20°, β = 67.77°, γ = 97.35° for II. The refinement of the atomic parameters led to final discrepancy factors of R = 0.059 for I and R = 0.086 for II.The existence of ligands with electron donor behaviour and the σ-bonds W—C have no significant effect on the bond distances of the carbonyl groups.
    Notes: Es wurden die Röntgenkristallstrukturanalysen des (1-Ferrocenyl-1-oxo-ethyl)tricarbonylcyclopentadienylwolfram C5H5FeC5H4COCH2W(CO)3C 5H5 (I) und des μ-[(1-oxo-ethyl)cyclopentadienyl](tricarbonylmangan)tricarbonylcyclopentadienylwolfram (CO)3MnC5H4COCH2W(CO)3C5H5 (II) durchgeführt. Beide Substanzen kristallisieren in der triklinen zentrosymmetrischen Raumgruppe P1 mit den Gitterkonstanten a = 12,990 Å, b = 11,409 Å, c = 6,530 Å,α = 90,83°, β = 92,62°, γ = 110,37° für I und a = 6,886 Å, b = 20,860 Å, c = 6,907 Å,α = 97,20°, β = 67,77°, γ = 97,35° für II. Die Verfeinerung der Atomparameter mit Least-squares-Methoden erfolgte bis zu R-Werten von R = 0,059 bei I und R = 0,086 bei II.Die Anwesenheit verschiedener als Elektronendonatoren wirkender Liganden und die σ-Bindungen W—C haben keinen signifikanten Einfluß auf die Bindungsabstände der Ketogruppe.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19824870120
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  • 7
    Electronic Resource
    Electronic Resource
    Zur Struktur von N-Benzoylthiobenzamid (1983)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 498 (1983), S. 139-152 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure of N-BenzoylthiobenzamideN-Benzoylthiobenzamide forms two polymorphic modifications of which the crystal and molecular structures have been determined by X-ray structure analysis. In both modifications the molecules exist as NH tautomeres, but there are differences with regard to their rotameric configurations. In the monoclinic modification both symmetry independent molecules have a Z,Z′ configuration. The triclinic modification also contains two symmetry independent molecules, but now a Z,Z′ and an E,Z′ configuration exist. All four molecules deviate appreciably from planarity. The results of both structure determinations are compared with each other and with the structure of monothiodibenzoylmethane.
    Notes: N-Benzoylthiobenzamid bildet zwei polymorphe Modifikationen, deren Kristall- und Molekülstrukturen mittels Röntgenkristallstrukturanalyse ermittelt wurden. In beiden Formen liegen die Moleküle als NH-Tautomere vor. Unterschiede bestehen hinsichtlich der rotameren Konfigurationsverhältnisse. In der monoklinen Modifikation liegen beide symmetrieunabhängigen Moleküle in einer Z,Z′-Konfiguration vor. In der triklinen Modifikation, die ebenfalls zwei symmetrie-unabhängige Moleküle enthält, sind sowohl eine Z,Z′- als auch eine E,Z′-Konfiguration realisiert. Alle Moleküle weichen stark von der Planarität ab. Die Ergebnisse der beiden Strukturbestimmungen werden miteinander und mit der des Monothiodibenzoylmethans verglichen.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19834980319
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  • 8
    Electronic Resource
    Electronic Resource
    Kristall- und Molekülstruktur von Bis[N-(diethylaminothiocarbonyl)-N′-phenylbenzamidinato]nickel(II) (1984)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 515 (1984), S. 41-50 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal and Molecular Structure of Bis[N-(diethylaminothiocarbonyl)-N′-phenyl-benz-amidinato]nickel(II)The structure of bis[N-(diethylaminothiocarbonyl)-N′-phenyl-benzamidinato]-nickel(II) has been determined by X-ray structure analysis. The compound crystallizes in orthorhombic space group P212121 with a = 16.36, b = 16.94, c = 12.96 Å and Z = 4. The solution of the structure was performed by heavy atom technique and gave a final R value of R = 0.055 for 1764 observed reflections. The coordination polyhedron has a tetrahedrally distorted shape. The ligator atoms are arranged in cis position. The chelate rings deviate clearly from planarity. Against the chelate rings the phenyl rings are appreciably twisted. The title compound is compared regarding its structure with the analogous copper chelate.
    Notes: Mittels Röntgenkristallstrukturanalyse wurde die Struktur von Bis[N-(diethylaminothiocarbonyl)-N′-phenyl-benzamidinato]nickel(II) bestimmt. Die Substanz kristallisiert orthorhombisch in der Raumgruppe P212121 mit den Gitterkonstanten a = 16,36, b = 16,94, c = 12,96 Å und Z = 4. Die Lösung der Struktur erfolgte mit der Schweratommethode und führte zu einem abschließenden R-Wert von R = 0,055 für 1764 beobachtete Reflexe. Das Koordinations-polyeder hat eine tetraedrisch verzerrte Form. Die Ligatoren sind in cis-Stellung angeordnet. Die Chelatringe weichen deutlich von der Planarität ab. Gegenüber den Chelatringen sind die Phenylringe beträchtlich verdreht. Die Titelsubstanz wird bezüglich ihrer Struktur mit dem analogen Kupferchelat verglichen.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19845150805
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  • 9
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    External-store drag reduction at transonic and low supersonic Mach numbers by application of Baldwin's moment-of-area rule (1955)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: GENERAL
    Type: NACA Conf. on Aerodyn. of High Speed Aircraft; p 93-103
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    NASA TECHNICAL REPORTS
  • 10
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    Guidance and Control Design for High-Speed Rollout and Turnoff (ROTO) (1996)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A ROTO architecture, braking and steering control law and display designs for a research high speed Rollout and Turnoff (ROTO) system applicable to transport class aircraft are described herein. Minimum surface friction and FMS database requirements are also documented. The control law designs were developed with the aid of a non-real time simulation program incorporating airframe and gear dynamics as well as steering and braking guidance algorithms. An attainable objective of this ROTO system, as seen from the results of this study, is to assure that the studied aircraft can land with runway occupancy times less then 53 seconds. Runway occupancy time is measured from the time the aircraft crosses the runway threshold until its wing tip clears the near side of the runway. Turnoff ground speeds of 70 knots onto 30 degree exits are allowed with dry and wet surface conditions. Simulation time history and statistical data are documented herein. Parameters which were treated as variables in the simulation study include aircraft touchdown weight/speed/location, aircraft CG, runway friction, sensor noise and winds. After further design and development of the ROTO control system beyond the system developed earlier, aft CG MD-11 aircraft no longer require auto-asymmetric braking (steering) and fly-by-wire nose gear steering. However, the auto ROTO nose gear hysteresis must be less than 2 degrees. The 2 sigma dispersion certified for MD-11 CATIIIB is acceptable. Using this longitudinal dispersion, three ROTO exits are recommended at 3300, 4950 and 6750 feet past the runway threshold. The 3300 foot exit is required for MD-81 class aircraft. Designs documented in this report are valid for the assumptions/models used in this simulation. It is believed that the results will apply to the general class of transport aircraft; however further effort is required to validate this assumption for the general case.
    Keywords: Aircraft Stability and Control
    Type: NASA-CR-201602 , NAS 1.26:201602 , CRAD-9206-TR-1659
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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