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1

Digitale Medien

Molecular weight calculations with a microprocessor based gel permeation chromatograph (1978)

Girard, J. E. ; Goehner, R. P. ; Hatfield, W. T. ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 1 (1978), S. 206-208

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ISSN: 0935-6304

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240010409

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2

Digitale Medien

Mass spectrometry of heterocyclic compounds. XVPart XIV: L. Ceraulo, M. Ferrugia, S. Petruso, P. Agozzino and A. Selva. Ann. Chim. (Rome) 67, 721 (1977). - The mechanism of the fragmentation under electron impact of 3-p-NH2-phenyl-5-phenyl-1,2,4-oxadiazole. A CNDO/2 treatment (1978)

Selva, A. ; Traldi, P. ; Fantucci, P.

Chichester : Wiley-Blackwell

Biological Mass Spectrometry 13 (1978), S. 695-696

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ISSN: 0030-493X

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Molecular orbital calculations using the semi-empirical CNDO/2 method were carried out on the molecular ion of 3-p-NH2-phenyl-5-phenyl-1,2,4-oxadiazole, whose structure had been determined by X-ray diffraction. The calculated diatomic interaction energy values are consistent with the mechanistic proposals made previously in terms of the quasi-equilibrium theory concerning the cleavage of the heterocycle ring after electron impact.

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/oms.1210131206

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3

Digitale Medien

Carbon-13 chemical shifts of some model carboxylic acids and esters (1978)

Couperus, P. A. ; Clague, A. D. H. ; van Dongen, J. P. C. M.

Chichester : Wiley-Blackwell

Organic Magnetic Resonance 11 (1978), S. 590-597

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ISSN: 0030-4921

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Selected model carboxylic acids and esters dissolved in deuteriochloroform have been studied by carbon-13 nuclear magnetic resonance under standardized conditions. Assignments of the chemical shifts have been made for all samples, and the spin-lattice relaxation times and nuclear Overhauser effects measured for a few selected esters. The results are intended to provide a practical aid for the analysis of carboxylic acids and esters of a more complex nature (e.g. polymers, natural products, etc.).

Zusätzliches Material: 4 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/mrc.1270111203

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4

Digitale Medien

Spectrométrie de Masse d'Hétérocycles Azotés. VII - Phenyl-1 Triazole-1,2,3Publication précédente: J.-L. Aubagnac et D. Bourgeon, Org. Mass Spectrom. 12, 65 (1977). (1978)

Aubagnac, J.-L. ; Campion, P. ; Guenot, P.

Chichester : Wiley-Blackwell

Biological Mass Spectrometry 13 (1978), S. 571-574

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ISSN: 0030-493X

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Beschreibung / Inhaltsverzeichnis: Comparison of the ‘normal’ and mass analysed ion kinetic energy spectra of 1-phenyl-1,2,3-triazole and a few D and 13C labelled derivatives indicates that the ions may follow two competing decomposition pathways: a simple rupture without rearrangement is preferred by the ions of high internal energy content (normal spectrum). On the other hand, for low internal energy metastable ions, loss of HCN is more important and occurs after a complete randomization of the H atoms.

Notizen: La comparaison des spectres normaux et MIKE du phényl-1 triazole-1,2,3 et de ses dérivés deutériés et marqués au 13C indique que les ions peuvent se décomposer selon deux voies compétitives: une rupture simple sans réarrangement est préférentielle pour les ions de haute énergie (spectre normal). Au contraire, la perte de HCN domine pour les ions de basse énergie (métastables) et a lieu après mixage complet des atomes d'hydrogène.

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/oms.1210131005

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5

Digitale Medien

The direct measurement of Ga in binary Pu—Ga alloys using X-ray spectrometic techniquesThe work was performed under the auspices of the US Department of Energy, under contract No. W- 7045-Eng-48.‘This report was prepared as an account of work sponsored by the United States Government. Neither the United States nor the United States Department of Energy, nor any of their employees, nor any of their contractors, subcontractors, or their emplotyees, makes any warranty, express or implied, or assumes any legal libility or responsibility for the accuracy, completeness or usefulness of any information, apparatus, product or process disclosed, or represents that its use would not infringe privately-owned rights.’ (1978)

Wallace, P. L. ; Homser, P. K. ; Walden, J. C. ; [weitere]

New York, NY [u.a.] : Wiley-Blackwell

X-Ray Spectrometry 7 (1978), S. 212-216

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ISSN: 0049-8246

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Physik

Notizen: Three X-ray spectrometric procedures have been developed to directly measure the Ga content in binary Pu—Ga alloys. In one procedure en energy-dispersive spectrometer is used; in the other two a wavelengh-dispersive spectrometer is used. Certified reference alloys with known Ga content have been produced, and simple procedures to handle them safely have been developed. We have constructed an energy-dispersive spectrometer system for analyzing Pu-containing materials and charactrerized the low energy gamma-ray spectrum of Pu.

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/xrs.1300070408

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6

Digitale Medien

Rearranged glucuronic acid conjugates of bilirubin-IXα in post-obstructive bile. Structure elucidation of azopigments β and γ as ethyl anthranilate N-glycosides derived from 2-, 3- and 4-O-acyl glucuronides (1978)

Compernolle, Frans ; Van Hees, Gustaaf P. ; Heirwegh, Karel P. M.

Chichester : Wiley-Blackwell

Biological Mass Spectrometry 5 (1978), S. 453-459

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ISSN: 0306-042X

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Azopigment analysis was performed on conjugates of bilirubin-IXα in bile of man and rats obtained after obstruction of the bile duct or in bile incubated under N2. The azopigments β and γ, formed by applying a pH 2.7 diazonium reagent containing an excess of ethyl anthranilate, correspond to rearranged ethyl anthranilate N-glucuronides having the azodipyrrole acyl group on positions 2, 3 and 4 of the sugar. These assignments were verified, first by conversion of the structurally known 2-, 3- and 4-O-acyl glucuronide azopigments, unsubstituted at C-1, into ethyl anthranilate N-glucuronide reference compounds, and second, by mass spectrometry of trimethylsilyl ether methyl ester derivatives of unknown and reference compounds. The C-1 ethyl anthranilate group of the N-glucuronides triggers characteristic fragmentation reactions of the carbohydrate moiety revealing the position of the azodipyrrole O-acyl group.

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/bms.1200050707

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7

Digitale Medien

Raman spectra of caesium and rubidium tetrachloroaluminates in the solid state (1978)

Rubbens, A. ; Wallart, F. ; Barbier, P. ; [weitere]

Chichester [u.a.] : Wiley-Blackwell

Journal of Raman Spectroscopy 7 (1978), S. 249-253

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ISSN: 0377-0486

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: Raman spectra of both polycrystalline samples and single crystals of CsAlCl4 and RbAlCl4 (space group Pnma (D2h16)) have been recorded in the temperature range 298-80 K.As for the other chloroaluminates, we find the four characteristic bands of the tetrahedral AlCl4- anion at 353, 128, 485-503, 180-187 cm-1 and 356, 127, 486-505 and 180-187 cm-1, respectively, for the salts CsAlCl4 and RbAlCl4. The Raman spectra of single crystals of these two compounds are similar and show that these two salts are isostructural. An assignment of the observed bands is proposed. The results are compared with those for the polyatomic cation (nitrosyl and ammonium) tetrachloroaluminates.

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jrs.1250070505

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8

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Effects of wing leading-edge deflection on the low-speed aerodynamic characteristics of a low-aspect-ratio highly swept arrow-wing configuration (1978)

Weston, R. P. ; Coe, P. L., Jr.

In: CASI

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Publikationsdatum: 2019-06-27

Beschreibung: Wing leading-edge deflection effects on the low-speed aerodynamic characteristics of a low-aspect-ratio highly swept arrow-wing configuration were determined. Static force tests were conducted in a V/STOL tunnel at a Reynolds number of about 2.5 x 1 million for an angle-of-attack range from -10 deg to 17 deg and an angle-of-sideslip range from -5 deg to 5 deg. Limited flow visualization studies were also conducted in order to provide a qualitative assessment of leading-edge upwash characteristics.

Schlagwort(e): AERODYNAMICS

Materialart: NASA-TM-78787

Format: application/pdf

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The dynamics and control of large flexible space structures. Part B: Development of continuum model and computer simulation (1978)

Bainum, P. M. ; James, P. K. ; Kumar, V. K.

In: CASI

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Publikationsdatum: 2019-06-27

Beschreibung: The equations of motion of an arbitrary flexible body in orbit were derived. The model includes the effects of gravity with all its higher harmonics. As a specific example, the motion of a long, slender, uniform beam in circular orbit was modelled. The example considers both the inplane and three dimensional motion of the beam in orbit. In the case of planar motion with only flexible vibrations, the pitch motion is not influenced by the elastic motion of the beam. For large values of the square of the ratio of the structural modal frequency to the orbital angular rate the elastic motion was decoupled from the pitch motion. However, for small values of the ratio and small amplitude pitch motion, the elastic motion was governed by a Hill's 3 term equation. Numerical simulation of the equation indicates the possibilities of instability for very low values of the square of the ratio of the modal frequency to the orbit angular rate. Also numerical simulations of the first order nonlinear equations of motion for a long flexible beam in orbit were performed. The effect of varying the initial conditions and the number of modes was demonstrated.

Schlagwort(e): SPACECRAFT DESIGN, TESTING AND PERFORMANCE

Materialart: NASA-CR-156976

Format: application/pdf

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Injection slot location for boundary-layer control in shock-induced separation (1978)

Prabhu, A. ; Narasimha, R. ; Sagdeo, P. M. ; [weitere]

In: Other Sources

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Publikationsdatum: 2019-07-13

Beschreibung: An experimental investigation of the effect of tangential air injection, when the injection slot is located inside of what would otherwise have been the dead air zone in a separated flow, in controlling shock-induced turbulent boundary layer separation is presented. The experiments were carried out at a free-stream Mach number of 2.5 in the separated flow induced by a compression corner with a 20 deg angle. The observations made were wall static pressures, pitot profiles, and schlieren visualizations of the flow. The results show that the present location for injection is more effective in suppressing boundary-layer separation than the more conventional one, where the slot is located upstream of where separation would occur in the absence of injection.

Schlagwort(e): AERODYNAMICS

Materialart: AIAA PAPER 78-1168 , Fluid and Plasma Dynamics Conference; Jul 10, 1978 - Jul 12, 1978; Seattle, WA

Format: text

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