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  • AERODYNAMICS  (251)
  • Inorganic Chemistry  (136)
  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE  (130)
  • 2020-2024
  • 1975-1979  (517)
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  • 1
    Publication Date: 2019-06-27
    Description: A method for correcting discrete element lifting surface theory to reflect given experimental data is presented. Theoretical pressures are modified such that imposed constraints are satisfied while minimizing the changes to the pressures. Several types of correction procedures are presented and correlated; (1) scaling of pressures; (2) scaling of downwash values; and (3) addition of an increment to the downwash that is proportioned to pressure. Some special features are included in these methods and they include: (1) consideration of experimental data from multiple deflection modes, (2) limitation of the amplitudes of the correction factors, and (3) the use of correction factor mode shapes. These methods are correlated for cases involving all three Mach Number ranges using a FORTRAN IV computer program. Subsonically, a wing with an oscillating partial span control surface and a wing with a leading edge droop are presented. Transonically a two-dimensional airfoil with an oscillating flap is considered. Supersonically an arrow wing with and without camber is analyzed. In addition to correction factor methods an investigation is presented dealing with a new simplified transonic modification of the two-dimensional subsonic lifting surface theory. Correlations are presented for an airfoil with an oscillating flap.
    Keywords: AERODYNAMICS
    Type: NASA-CR-144967
    Format: application/pdf
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  • 2
    Publication Date: 2019-06-27
    Description: A preliminary assessment of possible means for improving the low speed aerodynamic characteristics of advanced supersonic cruise arrow wing configurations and to extend the existing data base of such configurations has been made. Principle configuration variables included wing-leading and trailing-edge flap deflection, fuselage nose strakes, and engine exhaust nozzle deflection. Results showed that deflecting the wing leading edge apex flaps downward provided improved longitudinal stability but resulted in reduced directional stability. The model exhibited relatively low values of directional stability over the operational angle of attack range and experienced large asymmetric yawing moments at high angles of attack. The use of nose strakes was found to be effective in increasing the directional stability and eliminating the asymmetric yawing moment.
    Keywords: AERODYNAMICS
    Type: NASA-TM-74043
    Format: application/pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 411 (1975), S. 163-172 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Darstellung und Kristallchemie der ternären Silicate und Germanate mit Alkali (Na+, K+)- und Erdalkali (Ca2+, Sr2+, Ba2+)-KationenDie Darstellung von neuen ternären Silicat- und Germanat-Phasen mit großen Alkali- und Erdalkalikationen wird beschrieben. Sie wurden durch Festkörperreaktion von Mischungen der Carbonate bzw. Oxalate mit SiO2 bzw. GeO2 oder durch Schmelzen und anschließende Rekristallisation des Glases erhalten.Vertreter der kubischen M4+M2+X3O9-Familie sind Na4CaSi3O9 und die isostrukturellen Verbindungen K4CaGe3O9, K4SrGe3O9, K4CaSi3O9 und K4SrSi3O9. K4BaSi3O9 ist pseudokubisch; die Symmetrie des Na4SrSi3O9 ist unbekannt. Zur rhomboedrischen M8+M2+X10O25-Familie gehören K8CaSi10O25, K8SrSi10O25 und K8BaSi10O25.Na2CaGe2O6 und Na2SrGe2O6 sind isostrukturell, aber strukturell nicht mit Na2BaSi2O6 verwandt. Na2Ba2Ge2O7 und Na2Ba2Si2O7 sind strukturell ähnlich.
    Notes: The synthesis of new ternary silicate and germanate phases containing large alkali and alkaline-earth cations is described. They are made by solid-state reaction of mixtures of carbonates or oxalates with SiO2 or GeO2, or by fusion and subsequent recrystallization of the glass.Representatives of the cubic M4+M2+X3O9 family include Na4CaSi3O9 and the isostructural compounds K4CaGe3O9, K4SrGe3O9 and K4SrSi3O9. K4BaSi3O9 is pseudocubic: the symmetry of Na4SrSi3O9 is unknown. The rhombohedral M8+M2+X10O25 family includes K8CaSi10O25, K8SrSi10O25 and K8BaSi10O25.Na2CaGe2O6 and Na2SrGe2O6 are isostructural but both are structurally unrelated to Na2BaSi2O6. Na2Ba2Ge2O7 and Na2Ba2Si2O7 are structurally similar.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 423 (1976), S. 173-179 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Untersuchungen an MM″ (NCS)4-Komplexen (M = NiII, FeII, ZnII; M″ = HgII, ZnII)Komplexe des Typs MM′(NCS)4 · xL M = NiII, FeII, ZnII; M″ = HgII, ZnII; x = 2, 4, 6; L = Nicotinamid (nia), Isonicotinsaiurehydroxid (inh) 2-Aminopyrimidin (2apm)] wurden dargestellt und charakterisiert durch Elementaranalyse, molare Leitfähigkeit, magnetisches Moment, IR- und Elektronenspektren.
    Notes: Coordination complexes of the type MM″(NCS)4 · xL M = Ni(II), Fe(II), Zn(II), M″ = Hg(II), Zn(II), x = 2, 4, 6 and L = nicotinamide (nia), 3-cyanopyridine (3-cpy), 4-cyanopyridine (4cpy), 4-aminopyridine (4apy), isonicotinic acid hydrazide (inh), 2-aminopyrimidine (2apm)l have been prepared and characterized by elemental analysis, molar conductance, magnetic moment, infrared and electronic spectral studies. Molar conductance data of NiZn(NCS), complexes are equivalent to 1:1 electrolyte. The infrared spectral studies indicate that only bridged thiocyanate groups are present in the complexes of the type NiHg(SCN)4 · 4L [L=3 and 4cpy, inh] and FeHg(SCN)4 · 2L [L = nia, 2apm], whereas both bridged and terminal thiocyanates are present in the complexes of the type NiHg(SCN)4 · 4L [L = nia, 3apy and ZnHg(SCN)4 · 2(inh). BOHR magneton values and electronic spectral data indicate an octahedral environment around nickel and iron in their complexes. Symmetry and group theory have also been used to establish the structure of the complexes.
    Additional Material: 2 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 449 (1979), S. 25-40 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Vanadiumoxid Monoschichtkatalysatoren. I. Darstellung, Charakterisierung und thermische StabilitätDurch Chemisorption von Vanadat(V)-Anionen aus wäßrigen Lösungen, bzw. Chemisorption von gasförmigem V2O3(OH)4 wurden Vanadinoxidkatalysatoren des Monoschichttyps dargestellt. Mit Al2O3, Cr2O3, TiO2, CeO2, und ZrO2 als Trägeroxiden, können Katalysatoren mit einer ungefähr vollständigen monomolekularen Schicht von Vanadin(V)-Oxid auf den Trägeroxiden dargestellt werden, falls die Temperatur nicht zu hoch ist. Zweiwertige Metalloxide wie z. B. CdO und ZnO können schon bei niedriger Temperatur dreidimensionale Oberflächenvanadate bilden.Die thermische Stabilität eines Monoschichtkatalysators ist verbunden mit dem Parameter z/a: dem Quotient der Ladung des Trägerkations und der Summe der Ionenradien von Trägerkation und Oxidanion. Monoschichten werden thermisch nur stabil sein, falls z/a nicht zu groß (aggregierter Katalysator) und nicht zu klein (Bildung einer ternären Verbindung) ist.
    Notes: Vanadium oxide catalysts of the monolayer type have been prepared by means of chemisorption of vanadate(V)-anions from aqueous solutions and by chemisorption of gaseous V2O3(OH)4. Using Al2O3, Cr2O3, TiO2, CeO2 and ZrO2, catalysts with an approximately complete monomolecular layer of vanadium(V) oxide on the carrier oxides can be prepared, if temperature is not too high. Divalent metal oxides like CdO and ZnO may already form threedimensional surface vanadates at moderate temperature.The thermal stability of a monolayer catalyst is related to the parameter z/a, i. e. the ratio of the carrier cation charge to the sum of ionic radii of carrier cation and oxide anion. Thus, monolayer catalysts will be thermally stable only under the condition that z/a is not too high (aggregated catalyst) nor too small (ternary compound formation).
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 457 (1979), S. 238-240 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Darstellung und Eigenschaften von Hg5TeCl8In schwefelsaurer Lösung reagiert HgTe mit überschüssigen Quecksilber(II)-Ionen unter Bildung löslicher kationischer mehrkerniger Komplexe. Die Verbindungen Hg5TeCl8 und Hg4Te(SO4)3 werden dargestellt und beschrieben.
    Notes: Telluride ion forms polynuclear soluble cationic complexes with excess Hg(II) in sulphuric acid media. Compounds Hg5TeCl8 and Hg4Te(SO4)3 were prepared and characterised.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 456 (1979), S. 16-28 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: About the Reactivity of Na [Mn2(CO)9CN]The reactions of Na[Mn2(CO)9CN] with Et3OBF4, Me3SiCl, Me3GeCl, Me3SnCl, PPh2Cl, or MeCOCl lead to the dinuclear monoisonitrile complexes Mn2(CO)9CNR (R = Et, SiMe3, GeMe3, SnMe3, PPh2, COMe) which are characterized by their mass, vibrational, and n.m.r. spectra. However the solvates Na[Mn2(CO)9CN] · CH3COCH2Cl and Na[Mn2(CO)9CN] · NCCH2Cl are formed with CH3COCH2Cl and NCCH2Cl. Similar adducts are obtained with the Lewis bases CH3COCH3, NCCH3, and O(C2H5)2.
    Notes: Bei den Reaktionen von Na[Mn2(CO)9CN] mit Et3OBF4, Me3SiCl, Me3GeCl, Me3SnCl, PPh2Cl bzw. MeCOCl, werden die zweikernigen Monoisonitril-Komplexe Mn2(CO)9CNR (R = Et, SiMe3, GeMe3, SnMe3, PPh2, COMe) gebildet, die anhand ihrer Massen-, Schwingungs- und NMR-Spektren charakterisiert werden. Dagegen führen die entsprechenden Umsetzungen mit CH3COCH2Cl bzw. NCCH2Cl zu den Solvaten Na[Mn2(CO)9CN] · CH3COCH2Cl und Na[Mn2(CO)9CN] · NCCH2Cl. Eine ähnliche Adduktbildung erfolgt auch mit den Lewisbasen CH3COCH3, NCCH3 und O(C2H5)2.
    Additional Material: 3 Ill.
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  • 8
    Publication Date: 2011-08-16
    Description: The Advanced Thermal Control Flight Experiment on ATS-6 was designed to demonstrate the thermal control capability of a thermal diode (one-way) heat pipe, a phase-change material for thermal storage, and a feedback-controlled heat pipe. Flight data for the different operational modes are compared to ground test data, and the performance of the components is evaluated on an individual basis and as an integrated temperature-control system.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: IEEE Transactions on Aerospace and Electronic Systems; AES-11; Nov. 197
    Format: text
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  • 9
    Publication Date: 2016-06-07
    Description: A low speed investigation was conducted in the Langley V/STOL tunnel to determine the powered lift aerodynamic performance of a distributed upper surface blown propulsive lift transport model. The model used blowing slots across the span of the wing to produce a thin jet efflux near the leading edge and at the knee of the trailing edge flap (internally blown jet flap). Results indicate that these concepts have both good propulsive related lift and low drag due to lift characteristics because of uniform spanwise propulsive thrust. The leading edge blowing concept provides low speed lift characteristics which are competitive with the flap-hinge-line blowing concept and does not require additional leading edge treatment for prevention of abrupt stall.
    Keywords: AERODYNAMICS
    Type: Powered-Lift Aerodyn. and Acoustics; p 159-164
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  • 10
    Publication Date: 2016-06-07
    Description: Results of studies conducted to explore the use of powered lift concepts for improved low speed performance of long range subsonic and supersonic cruise vehicles are summarized. It is indicated that powered lift can provide significant improvements in low speed performance, as well as substantial increases in cruise efficiency and range for both subsonic and supersonic cruise configurations.
    Keywords: AERODYNAMICS
    Type: Powered-Lift Aerodyn. and Acoustics; p 89-101
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