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Frequency-doubled CO2 lidar measurement and diode laser spectroscopy of atmospheric CO2 (1983)

Gentry, B. M. ; Strow, L. L. ; Itabe, T. ; [weitere]

In: Other Sources

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Publikationsdatum: 2011-08-18

Beschreibung: A lidar instrument based on pulsed frequency-doubled carbon-dioxide lasers has been used at 4.88 microns for remote sensing of atmospheric carbon dioxide. A tunable-diode laser spectrometer provided the high-resolution spectroscopic data on carbon-dioxide line strength and line broadening needed for an accurate differential absorption measurement. Initial field measurements are presented, and instrument improvements necessary for accurate carbon dioxide measurement are discussed.

Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY

Materialart: Applied Optics (ISSN 0003-6935); 22; Sept. 1

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Impact of Thematic Mapper Sensor Characteristics on Classification Accuracy (1984)

Nelson, R. F. ; Latty, R. S. ; Toll, D. L. ; [weitere]

In: CASI

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Publikationsdatum: 2014-09-13

Beschreibung: A three factor (spectral, spatial, and radiometric resolution), two level (TM and MSS) analysis of variance (ANOVA) approach allowed evaluation of the effects of each factor individually and in all possible combinations. Digital classification accuracy was used as the figure of merit. Nine study sites in Washington, D.C. each of approximately 256 x 256 TM pixels, were randomly selected from the full scene for analysis. These results strongly suggest that the quantization level improvements and the addition of new spectral bands in the visible and middle IR regions (both afforded by the TM sensor design) can result in improved capabilities to accurately delineate land cover categories using a per point Gaussian maximum likelihood classifier. On the other hand, results indicate that the increase in spatial resolution to 30m does not significantly enhance classification accuracy. The spatial result points to an inherent limitation of a per point classifier and to the need to improve data analysis techniques to handle high spatial resolution data.

Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY

Materialart: LANDSAT-4 Sci. Invest. Summ., Including Dec. 1983 Workshop Results, Vol. 2; p 93-97

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Sealing technique for static coating of large bore capillary columns (1981)

Peters, T. L. ; Nestrick, T. J. ; Lamparski, L. L.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 4 (1981), S. 588-588

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ISSN: 0935-6304

Schlagwort(e): Capillary columns ; End sealing ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240041113

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Characterization of underived nucleotides by mass spectrometry using the MBSA-FAB ionization method (1983)

Aubagnac, J. L. ; Devienne, F. M. ; Combarieu, R. ; [weitere]

Chichester : Wiley-Blackwell

Biological Mass Spectrometry 18 (1983), S. 361-364

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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

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/oms.1210180812

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Doubly charged ion mass spectra: III - N-alkanes (1982)

Jones, B. E. ; Abbey, L. E. ; Chatham, H. L. ; [weitere]

Chichester : Wiley-Blackwell

Biological Mass Spectrometry 17 (1982), S. 10-18

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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: Doubly charged ion mass spectra have been obtained for 15 n-alkane hydrocarbons. Spectra were measured using a Nier-Johnson geometry Hitachi RMU-7L mass spectrometer operated at 1.6kV accelerating voltage. Fragment ions, which resulted from C—C bond rupture and extensive H loss, dominated the spectra. Molecular ions have not been observed. The most intense ions in the doubly charged ion mass spectra of n-alkanes were [C2H4]2+, [C3H2]2+, [C4H3]2+, [C5H2]2+, [C6H6]2+, [C6H8]2+, [C7H6]2+, [C7H8]2+, [C8H6]2+ and [C8H8]2+. Appearance energies for forming the prominent doubly charged fragment ions have been measured and range from 27.5 eV to energies greater than 60eV. A geometry optimized SCF approach has been used to compute the energies and structures of prominent ions in the doubly charged mass spectra.

Zusätzliches Material: 8 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/oms.1210170103

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Applications of Fourier transform mass spectrometry (1983)

Johlman, Carolyn L. ; White, Robert L. ; Wilkins, Charles L.

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

Mass Spectrometry Reviews 2 (1983), S. 389-415

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ISSN: 0277-7037

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Zusätzliches Material: 7 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/mas.1280020303

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Analyse Vibrationnelle et Structurale en Série Aliphatique Saturée 4Pour l'article 3 dans cette série voir J. L. Delarbre, L. Maury et L. Bardet, J. Raman Spectrosc. 11, 288 (1981). - Spectres de Vibration de I'Acide Diméthylmalonique et de ses Sels Alcalins en Solution Aqueuse (1982)

Delarbre, J. L. ; Maury, L. ; Bardet, L.

Chichester [u.a.] : Wiley-Blackwell

Journal of Raman Spectroscopy 13 (1982), S. 1-8

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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

Beschreibung / Inhaltsverzeichnis: Vibrational spectra (Raman and infrared) of dimethylmalonic acid and its potassium salts in aqueous solutions (H2O and D2O) were recorded from 250 to 4000 cm-1. The analysis of the polarization of the Raman lines led us to conclude that dimethylmalonic acid and dipotassium salt belong to C2 while the acid salt belongs to the Cs group, the symmetry plane bisecting the COO- group. An assignment of the observed lines as fundamentals is proposed.

Notizen: Les spectres de vibration (Raman et infrarouge) de l'acide dimétyhlmalonique et de ses sels alcalins en solution aqueuse (H2O et D2O) ont été anregistrés de 250 à 4000 cm-1. L' ananlyse de l'état de polaristion des raies Raman observées permet de conclure que l'acide diméthylmalonique et le sel neutre appartiennent au groupe C2 tandis que le sel acide répond au groupoe Cs, le plan de symétrie étant bissectrur du groupe COO-. Une attribution des raies observées aux vibrations fondamentales est proposée.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jrs.1250130102

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Analyse Vibrationnelle et Structurale en Série Aliphatique Saturée: 5For Part 4 of this series, see Ref. 4. - Spectres de Vibration de l'Acide Ethylmalonique et de ses Sels Alcalins en Solution Aqueuse (1983)

Delarbre, J. L. ; Maury, L. ; Bardet, L.

Chichester [u.a.] : Wiley-Blackwell

Journal of Raman Spectroscopy 14 (1983), S. 426-433

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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

Beschreibung / Inhaltsverzeichnis: Raman and infrared spectra of ethylmalonic acid [C2H5CH(COOH)2, C2H5CD(COOD)2] and its potassium salts [C2H5CH(COOH)(COOK), C2H5CD(COOD)(COOK) and C2H5CH(COOK)2, C2H5CD(COOK)2] in aqueous solution were recorded from 3500 to 200 cm-1. The analysis of the polarization of the Raman lines led us to the conclusion that ethylmalonic acid and its dipotassium salt belong to Cs and the acid salt to the C1 group. An assignment of the observed lines as fundamentals is proposed.

Notizen: Les spectres Raman et infrarouge de l'acide éthylmalonique [C2H5CH(COOH)2, C2H5CD(COOD)2] et de ses sels alcalins [C2H5CH(COOH)(COOK), C2H5CD(COOD)(COOK) et C2H5CH(COOK)2, C2H5CD(COOK)2] en solution aqueuse ont été enregistrés de 3500 à 200 cm-1. L'analyse du facteur de dépolarisation nous a permis de conclure que l'acide et le dianion appartiennent au groupe de symétrie Cs le sel acide appartenant au groupe C1. Une attribution des vibrations fondamentales est proposée.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jrs.1250140612

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Molecular Clouds Within 100 Pc (1984)

Blitz, L. ; Magnani, L. ; Mundy, L.

In: CASI

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Publikationsdatum: 2014-09-16

Beschreibung: Observations at the 2.6 mm line of CO reveal the presence of a large number of molecular clouds at high galactic latitude. If the velocity dispersion of the clouds is a measure of their scale height, the mean distance of the ensemble detected is 100 pc. The clouds are unusual in that either they are not gravitationally bound or they are very deficient in CO relative to molecular hydrogen. These clouds represent a heretofore unrecognized component of the local interstellar medium. If they are pervasive in the Milky Way, they probably represent the small molecular cloud component of the interstellar medium.

Schlagwort(e): ASTROPHYSICS

Materialart: NASA. Goddard Space Flight Center Local Interstellar Medium, No. 81; p 231-234

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The filaments of NGC 1275 - A collision between a galaxy and an accretion flow? (1983)

Roesler, F. L. ; Cowie, L. L. ; Jenkins, E. B. ; [weitere]

In: Other Sources

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Publikationsdatum: 2019-06-28

Beschreibung: Morphological evidence is presented (in the form of 3-A-bandpass Fabry-Perot images made with a CCD camera) that the two bright emission-line systems seen toward the galaxy NGC 1275 arise from a high-velocity impact of a foreground galaxy upon the accretion flow of gas cooling in the center of the Perseus cluster. The uniquely high optical-line luminosity of NGC 1275, in comparison with other central galaxies in clusters observed to have cooling flows, may be explained by energy deposited during the collision. Using additional information from 21-cm and extinction measurements, a rough model of the interaction is developed. Problems remain with this model - such as the likelihood of a gas-rich system penetrating to the cluster center. The kinematic structure of the optically emitting gas shows additional complex structure near the nucleus of NGC 1275.

Schlagwort(e): ASTROPHYSICS

Materialart: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 275; L27-L31

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