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  • PHYSICAL SCIENCES  (12)
  • Earth Resources and Remote Sensing  (10)
  • COMMUNICATIONS AND RADAR  (7)
  • Analytical Chemistry and Spectroscopy  (5)
  • GENERAL
  • 2015-2019  (3)
  • 1990-1994  (32)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Analysis of rat urine for metabolites of pyrilamine via high-performance liquid chromatography/thermospray mass spectrometry and tandem mass spectrometry (1990)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 19 (1990), S. 191-201 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Combined high-performance liquid chromatography/thermospray mass spectrometry (HPLC/TSMS) and HPLC/thermospray tandem mass spectrometry (HPLC/TSMS/MS) were utilized for the analysis of rat urine for metabolites of pyrilamine. The sample was analyzed via HPLC/TSMS/MS in the parent ion mode in order to identify potential metabolites of pyrilamine. Then HPLC/TSMS/MS analysis in the daughter ion mode was performed to provide additional analytical selectivity plus enhanced fragmentation of suspected protonated molecules. By this methodology, suspected pyrilamine metabolites were confirmed to be in the sample and several novel metabolites of pyrilamine were discovered and tentatively identified.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200190317
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Chemical ionization and electron impact mass spectra of symmetrical S-alkyl alkanesulfonothioates (thiosulfonates) (1992)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 27 (1992), S. 609-610 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The chemical ionization (CI) and electron impact (EI) mass spectra of eight symmetrical S-alkyl alkanesulfonothioates (thiosulfonates) are reported.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210270512
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Chemical ionization and electron impact mass spectra of S-1-chloroalkyl alkanesulfonothioates (thiosulfonates) (1992)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 27 (1992), S. 611-614 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The chemical ionization (CI) and electron impact (El) mass spectra of six S-1-chloroalkyl alkanesulfonothioates (thiosulfonates) are reported.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210270513
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Unique thermospray mass spectrometry of 1,4-benzoquinone and analogs in ammonium acetate solutions (1991)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 26 (1991), S. 697-702 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In general, ions corresponding to [M + H]+ and/or [M + NH4]+ are observed in thermospray mass spectrometry (TSMS) when using ammonium acetate in the liquid carrier. For several quinones investigated, unique thermospray mass spectra were detected with a mass spectral peak corresponding to an [M + 16]+ ion being observed in aqueous ammonium acetate solutions. Investigation of l,4-benzoquinone (BQU) and structurally analogous quinones indicated that amine conjugate formation with BQU and similar quinones was the origin of the unique [M + 16]+ ion in TSMS. When methanol was added to the liquid carrier, ions corresponding to methoxy conjugation were detected. High-performance liquid chromatography followed by TSMS or electrochemical detection gave evidence that this amine and methoxy conjugate formation was occurring in the thermospray source area.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210260806
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  • 5
    Electronic Resource
    Electronic Resource
    Long-range carbon-proton couplings in strychnine (1994)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 32 (1994), S. 134-137 
    Details
    ISSN: 0749-1581
    Keywords: NMR ; 13C,H long-range couplings ; Strychnine ; Hadamard spectroscopy ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Long-range 13C,H NMR coupling constants were measured in strychnine at 400 MHz by a method that employs selective excitation of individual 13C sites under decoupled conditions followed by polarization transfer to protons. The sensitivity was improved by performing eight simultaneous soft-pulse experiments coded (±) according to a Hadamard matrix and later separated by reference to the same matrix. The antiphase 13C,H splittings were measured by J-doubling performed in the frequency domain.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260320214
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  • 6
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    Calibration experiments with DC-8 SAR data (1990)
    In:  CASI
    Details
    Publication Date: 2005-08-04
    Description: This paper is a summary of some research activities in calibrating DC-8 SAR data conducted in 1989/90 by the author and others. Firstly, by examining the process of 'symmetrization' in the production of DC-8 Stokes' matrix data, it is shown that an exact solution to the problem of calibrating this data exists, given certain assumptions. Secondly a new, more general, system model for radar polarimeters is proposed, together with a simple approach for verifying the model's validity. The importance of the orientation angle about the radar line of sight for some types of calibration devices is discussed and some results of an experiment to cross-calibrate the C-Band VV data from the DC-8 and DLR E-SAR sensors are presented.
    Keywords: COMMUNICATIONS AND RADAR
    Type: Proceedings of the Second Airborne Synthetic Aperture Radar (AIRSAR) Workshop; p 1-7
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Polarimetric SAR calibration experiment using active radar calibrators (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Active radar calibrators are used to derive both the amplitude and phase characteristics of a multichannel polarimetric SAR from the complex image data. Results are presented from an experiment carried out using the NASA/JPL DC-8 aircraft SAR over a calibration site at Goldstone, California. As part of the experiment, polarimetric active radar calibrators (PARCs) with adjustable polarization signatures were deployed. Experimental results demonstrate that the PARCs can be used to calibrate polarimetric SAR images successfully. Restrictions on the application of the PARC calibration procedure are discussed.
    Keywords: COMMUNICATIONS AND RADAR
    Type: IEEE Transactions on Geoscience and Remote Sensing (ISSN 0196-2892); 28; 224-240
    Format: text
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  • 8
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    Polarization effects and multipolarization SAR (1992)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: Imaging radar polarimeters are usually implemented using a Synthetic Aperture Radar (SAR) approach to give a high resolution image in two dimensions: range and azimuth. For each pixel in the image a polarimetric SAR gives sufficient information to characterize the polarimetric scattering properties of the imaged area (or target) as seen by the radar. Using a polarimetric SAR system as opposed to a single-polarization SAR system provides significantly more information about the target scattering mechanisms and allows better discrimination between different types of surfaces. In these notes a brief overview of SAR polarimetry is offered. The notes are intended as a text to accompany a lecture on SAR polarimetry as part of an AGARD-NATO course. Covered in the notes are the following: the polarization properties of electromagnetic waves; the concepts of radar scattering and measuring radar backscatter with a SAR; polarization synthesis; scattering matrix, Stokes matrix, and covariance matrix representations of polarimetric SAR data; polarization signature plots; design and calibration of polarimetric SAR systems; polarization filtering for target detection; fitting a simple model to polarimetric SAR measurements of naturally occurring features; and supervised classification of polarimetric SAR data.
    Keywords: COMMUNICATIONS AND RADAR
    Type: AGARD, Fundamentals and Special Problems of Synthetic Aperture Radar (SAR); 13 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Development of SIR-C Ground Calibration Equipment (1993)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: SIR-C/X-SAR is currently scheduled for launch in April 1994. SIR-C is an L-Band and C-Band, multi-polarization spaceborne SAR system developed by NASA/JPL. X- SAR is an X-Band SAR system developed by DARA/ASI. One of the problems involved in calibrating the SIR-C instrument is to make sure that the horizontal (H) and vertical (V) polarized beams are aligned in the azimuth direction, i.e.. that they are pointing in the same direction. This is important if the polarimetric performance specifications for the system are to be met. To solve this problem, we have designed and built a prototype of a low-cost ground receiver capable of recording received power from two antennas, one H-polarized, the other V-polarized. The two signals are mixed to audio then recorded on the left and right stereo channels of a standard audio cassette player. The audio cassette recording can then be played back directly into a Macintosh computer, where it is digitized. Analysis of.
    Keywords: Earth Resources and Remote Sensing
    Type: IEEE, Geoscience and Remote Sensing; Tokyo; Japan
    Format: text
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  • 10
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    The Effects of Noise on Polarimetric SAR Data (1993)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: Polarimetric SAR data can provide a great deal of information about the scattering behavior of the surface under observation. Polarimetric SAR systems often measure the scattering matrices of the areas under observation in linear polarizations (H and V). From the scattering matrix commonly used forms such as the covariance matrix and the Stokes matrix can be easily derived. Other measures derived from polarimetric SAR data include the standard deviation of texture, correlation coefficients between scattering matrix terms, and the mode and variance of phase differences between scattering matrix terms. The effects of additive system noise on these measurements is not often considered in the literature on this subject.
    Keywords: Earth Resources and Remote Sensing
    Type: IEEE, Geoscience & Remote Sensing; Tokyo; Japan
    Format: text
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