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  • Aerodynamics
  • Fluid Mechanics and Thermodynamics
  • GENERAL
  • Inorganic Chemistry
  • 1990-1994  (148)
  • 1955-1959  (70)
  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    Kristall- und Molekülstruktur von Tris(1,1-diethyl-3-benzoyl-thioureato)ruthenium(III) (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 580 (1990), S. 167-174 
    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 Tris(1,1-diethyl-3-benzoyl-thioureato)ruthenium(III)The crystal and molecular structure of tris(1,1-diethyl-3-benzoyl-thioureato)-ruthenium(III) has been determined by an X-ray structure analysis. The compound crystallizes in the trigonal space group P3 with a = 16.556, c = 8.476 Å and Z = 2. The structure was solved by Patterson methods and refined to a final R value R = 0.074 for 801 observed reflections. The molecule has the symmetry C3. The coordination polyhedron is an octahedron with facial arrangement of the ligator atoms. The Ru—S and Ru—O distances are 2.293 Å and 2.047 Å, respectively.
    Notes: Die Kristall- und Molekülstruktur von Tris(1,1-diethyl-3-benzoyl-thioureato)ruthenium(III) wurde durch Röntgenkristallstrukturanalyse bestimmt. Die Verbindung kristallisiert trigonal in der Raumgruppe P3 mit den Gitterkonstanten a = 16,556, c = 8,476 Å und Z = 2. Die Struktur wurde mittels Patterson-Methoden gelöst und bis zu einem abschließenden R-Wert R = 0,074 für 801 beobachtete Reflexe verfeinert. Das Molekül besitzt die Symmetrie C3. Das Koordinationspolyeder ist ein Oktaeder mit facialer Anordnung der Ligator-Atome. Die Ru—S- und Ru—O-Abstände betragen 2,293 Å bzw. 2,047 Å.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905800120
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of the Cationic Arrangement in Sn2F6 from neutron powder diffraction (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 590 (1990), S. 173-180 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A structural determination of the high-temperature form γ-Sn2F6 has been performed using neutron diffraction. This mixed fluoride exhibits the cubic ordered ReO3-type structure (Fm3m space group) with a = 8.321(4) Å at 497 K. The bond lengths SnII—F and SnIV—F give evidence of the presence of tin(II) in the (a) site and tin(IV) in the (b) site. A cationic ordering has also been found in the intermediate form β-Sn2F6 whose structure is related to the LiSbF6-type.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905900118
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  • 4
    Electronic Resource
    Electronic Resource
    Darstellung und Kristallstruktur von Cs2HgPdCl6, eine Verzerrungsvariante der ChloroperowskiteProfessor Hans-Joachim Seifert zum 60. Geburtstage gewidmet (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 603 (1991), S. 69-76 
    Details
    ISSN: 0044-2313
    Keywords: Dicesium mercury(II) palladium(II) hexachloride ; preparation ; crystal structure ; group-subgroup relation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structure of Cs2HgPdCl6, a Distorted Variant of ChloroperovskitsCs2HgPdCl6 single crystals show tetragonal symmetry with the space group I 4/m m m (No. 139) with 2 formular units per unit cell. The lattice parameters are a = 7.432(4) Å, c = 10.874(7) Å. The atomic arrangement of Cs2HgPdCl6 is explored by X-ray crystal structure analysis. The important polyhedrons are square-planar PdCl4 groups and HgCl2 dumbbells. The PdCl4 group is completed by two further chlorine atoms to a elongated octahedron and four further chlorine atoms form with the HgCl2 dumbbell a compressed octahedron. The crystal structure of Cs2HgPdCl6 is compared with the arrangement in halogenoperovskits and in Rb2PdCl4 [3].
    Notes: Die Verbindung Cs2HgIIPdIICl6 läßt sich durch Festkörperreaktion phasenrein darstellen. Sie kristallisiert in der Raumgruppe I 4/m m m (No. 139) mit a = 7,432(4) Å, c = 10,874(7) Å, Z = 2. Die Kristallstruktur wurde mit röntgenographischen Methoden an Einkristallen ermittelt. Pd2+ ist quadratisch-planar und Hg2+ hantelförmig von Cl-umgeben. In zweiter Nachbarschaft ergänzen weitere Cl- zu gestreckten bzw. gestauchten Oktaedern. Dieses Bauprinzip entspricht dem Aufbau von Cs2AuIAuIIICl6 [1, 2]. Es besteht direkte kristallchemische Beziehung zur Kristallstruktur der Halogenoperowskite bzw. des K2PdCl4-Typs.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19916030110
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  • 5
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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
    Format: text
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  • 6
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    A supercritical airfoil experiment (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The purpose of this investigation is to provide a comprehensive data base for the validation of numerical simulations. The objective of the present paper is to provide a tabulation of the experimental data. The data were obtained in the two-dimensional, transonic flowfield surrounding a supercritical airfoil. A variety of flows were studied in which the boundary layer at the trailing edge of the model was either attached or separated. Unsteady flows were avoided by controlling the Mach number and angle of attack. Surface pressures were measured on both the model and wind tunnel walls, and the flowfield surrounding the model was documented using a laser Doppler velocimeter (LDV). Although wall interference could not be completely eliminated, its effect was minimized by employing the following techniques. Sidewall boundary layers were reduced by aspiration, and upper and lower walls were contoured to accommodate the flow around the model and the boundary-layer growth on the tunnel walls. A data base with minimal interference from a tunnel with solid walls provides an ideal basis for evaluating the development of codes for the transonic speed range because the codes can include the wall boundary conditions more precisely than interference connections can be made to the data sets.
    Keywords: Aerodynamics
    Type: OTN-035236 , OTN-BIBL-AGARD-AR-303-Vol-2
    Format: text
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  • 7
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    Spatial Direct Numerical Simulation of Boundary-Layer Transition Mechanisms: Validation of PSE Theory (1991)
    In:  CASI
    Details
    Publication Date: 2018-06-05
    Description: A study of instabilities in incompressible boundary-layer flow on a flat plate is conducted by spatial direct numerical simulation (DNS) of the Navier-Stokes equations. Here, the DNS results are used to critically evaluate the results obtained using parabolized stability equations (PSE) theory and to study mechanisms associated with breakdown from laminar to turbulent flow. Three test cases are considered: two-dimensional Tollmien-Schlichting wave propagation, subharmonic instability breakdown, and oblique-wave break-down. The instability modes predicted by PSE theory are in good quantitative agreement with the DNS results, except a small discrepancy is evident in the mean-flow distortion component of the 2-D test problem. This discrepancy is attributed to far-field boundary- condition differences. Both DNS and PSE theory results show several modal discrepancies when compared with the experiments of subharmonic breakdown. Computations that allow for a small adverse pressure gradient in the basic flow and a variation of the disturbance frequency result in better agreement with the experiments.
    Keywords: Fluid Mechanics and Thermodynamics
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  • 8
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    Preliminary Results of the Determination of Inlet-Pressure Distortion Effects on Compressor Stall and Altitude Operating Limits of the J57-P-1 Turbojet Engine (1955)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: During an investigation of the J57-P-1 turbojet engine in the Lewis altitude wind tunnel, effects of inlet-flow distortion on engine stall characteristics and operating limits were determined. In addition to a uniform inlet-flow profile, the inlet-pressure distortions imposed included two radial, two circumferential, and one combined radial-circumferential profile. Data were obtained over a range of compressor speeds at an altitude of 50,000 and a flight Mach number of 0.8; in addition, the high- and low-speed engine operating limits were investigated up to the maximum operable altitude. The effect of changing the compressor bleed position on the stall and operating limits was determined for one of the inlet distortions. The circumferential distortions lowered the compressor stall pressure ratios; this resulted in less fuel-flow margin between steady-state operation and compressor stall. Consequently, the altitude operating Limits with circumferential distortions were reduced compared with the uniform inlet profile. Radial inlet-pressure distortions increased the pressure ratio required for compressor stall over that obtained with uniform inlet flow; this resulted in higher altitude operating limits. Likewise, the stall-limit fuel flows required with the radial inlet-pressure distortions were considerably higher than those obtained with the uniform inlet-pressure profile. A combined radial-circumferential inlet distortion had effects on the engine similar to the circumferential distortion. Bleeding air between the two compressors eliminated the low-speed stall limit and thus permitted higher altitude operation than was possible without compressor bleed.
    Keywords: Aerodynamics
    Type: NACA-RM-SE55E23
    Format: application/pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Cyclization of a chiral α-(δ′-benzyloxyalkyl)acrylate to a novel tetrahydrofuran derivative (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 2455-2456 
    Details
    ISSN: 0009-2940
    Keywords: Tetrahydrofurans ; Acrylates, α-(δ′-hydroxyalkyl)- ; Aldehydes, β-hydroxy- ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Methyl 3-hydroxy-2-(iodomethyl)-5-methyltetrahydrofuran-2-carboxylate (4) is synthesized from (3S)-3-(benzyloxy)butanal (2) via methyl 5-(benzyloxy)-3-hydroxy-2-methylenehexanoate (3a) as intermediate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901231231
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  • 10
    Electronic Resource
    Electronic Resource
    Folgereaktionen von Sulfenen aus Sulfonylchloriden und tertiären Aminen, 3[1,2] Kristallstrukturanalyse von Bis(trimethylammoniosulfonyl)methanid-tetraphenylborat. - n-σ*-Wechselwirkungen (Hyperkonjugation und Homohyperkonjugation) in Sulfen-Amin-S,N-Addukten (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 1621-1626 
    Details
    ISSN: 0009-2940
    Keywords: Bis(trimethylammoniosulfonyl)methanide tetraphenylborate ; Sulfene-amine adducts ; Hyperconjugation, negative ; Homohyperconjugation, negative ; n-σ* interactions ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Secondary Reactions of Sulfenes from Sulfonyl Chlorides and Tertiary Amines, 3[1,2]. - Crystal Structure Analysis of Bis(trimethylammoniosulfonyl)methanide Tetraphenylborate. - n-σ*-Interactions (Hyperconjugation and Homohyperconjugation) in Sulfene - Amine S,N-AdductsBis(trimethylammoniosulfonyl)methanide chloride (3b) could be obtained in 97% yield by reaction of methanedisulfonyl dichloride (5) with three equivalents of trimethylamine. X-ray analysis of the tetraphenylborate 3c reveals that the conformation of the cation is determined by nC-σ*S-N interactions (negative hyperconjugation) and by nC-σ*N-C interactions (negative homohyperconjugation). These effects were deduced from alterations of the bond lengths within the S-N-C chains which are coplanar to the occupied pz orbital at the central C atom. Comparison with known crystal structure data shows, that sulfene - amine S,N-adducts generally have the zwitterionic ammoniosulfonylmethanide structure 3, stabilized by nC-σ* interactions.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250717
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