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  • ASTRONOMY  (3)
  • Cyg X-2  (1)
  • Highly concentrated emulsions  (1)
  • Liquid crystals  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Cyg X-2 - An accreting neutron star
    Amsterdam : Elsevier
    Advances in Space Research 3 (1984), S. 67-70 
    Details
    ISSN: 0273-1177
    Keywords: Cyg X-2 ; X-ray source ; accreting neutron star ; comptonization
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0273-1177(84)90064-4
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Formation of highly concentrated emulsions in water/sucrose dodecanoate oil systems (1997)
    Springer
    Colloid & polymer science 105 (1997), S. 239-243 
    Details
    ISSN: 1435-1536
    Keywords: Highly concentrated emulsions ; HLB ; sucrose dodecanoate ; microemulsions ; phase behavior
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Conditions to produce highly concentrated emulsions or gel emulsions were investigated in water/sucrose dodecanoate/oil systems. HLB (Hydrophile-Lipophile Balance) of sucrose dodecanoate is changed by increasing the number of dodecane carboxylic groups attached to the sucrose ring. In order to know the correlation between the phase behavior and the formation of highly concentrated emulsions, the phase diagram of the water/mixed sucrose dodecanoate/decane system was constructed. In the sucrose monododecanoate system, the surfactant is mainly dissolved in water and forms micelles. With the increase in lipophilic chains, the sucrose surfactant tends to form reverse micelles in oil via microemulsions and lamellar liquid crystal. The formation of O/W-type and W/O-type highly concentrated emulsions is related to this phase behavior. The formation of W/O-type emulsions is enhanced upon addition of monolaurin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01188957
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of chain length distribution on the phase behavior of polyglycerol fatty acid ester in water (2000)
    Springer
    Colloid & polymer science 278 (2000), S. 899-904 
    Details
    ISSN: 1435-1536
    Keywords: Key words Polyglycerol fatty acid ester ; Small-angle X-ray scattering ; Liquid crystals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The effect of the chain length distribution on the phase behavior, the structure of liquid crystals, and physicochemical properties was investigated in water/ polyglycerol fatty acid ester. Polyglycerol fatty acid esters with sharply distributed polyglycerol (10G*0.7L) and with broadly distributed polyglycerol (10G0.7L) were used. Unreacted polyglycerol in both surfactants was removed. 10G*0.7L forms hexagonal liquid crystals at a higher concentration than 10G0.7L. The effective cross-sectional area of the lipophilic parts in the hexagonal phase of 10G0.7L is smaller than that of 10G*0.7L owing to the difference in the chain length distribution. Evidently, 10G0.7L molecules are tightly packed in aggregates; therefore, 10G0.7L decreased the surface tension more strongly and promoted emulsification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960000361
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  • 4
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    In-flight performance of the Broad-Band X-Ray Telescope (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The Broad-Band X-Ray Telescope (BBXRT) was designed to carry out moderate resolution spectrophotometry of cosmic X-ray sources in the 0.3-12 keV band from the Space Shuttle. It consists of a pair of coaligned conical foil telescopes, with cryogenically cooled Si(Li) spectrometers as focal instruments. It was flown as part of the Astro-1 mission in December, 1990. The in-flight performance of the instrument was essentially as predicted on the basis of ground calibration and modelling. We discuss the performance of the system, with emphasis on the conical mirror systems, and present some preliminary scientific results which illustrate the power of broad band, high sensitivity X-ray spectrophotometry.
    Keywords: ASTRONOMY
    Type: In: Multilayer and grazing incidence X-ray(EUV optics; Proceedings of the Meeting, San Diego, CA, July 22-24, 1991 (A93-39658 15-74); p. 72-81.
    Format: text
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  • 5
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    The x ray variability of AGN and the anomalous behavior of NGC6814 (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: The power spectra of the X-ray variable AGN are typically scale invariant with no characteristic timescale. The one strong exception to this is NGC6814, where the EXOSAT data showed evidence for a periodic component at 12200 plus or minus 100 seconds. The power spectra of a GINGA lightcurve from this source, found using simulation techniques to account for the uneven sampling, also cannot be well fit by a single power law. A folded light curve analysis of the GINGA data shows a strong peak in the variance, indicative of a periodic component, at 12130.9 plus or minus 0.6 seconds. A second GINGA observation of this source taken one year later is consistent with the periodicity maintaining phase coherence for 7 periods in the range of 12110-12145 seconds. Including the limits from the folding selects a period of 12130.39 plus or minus 0.05 seconds. Phase coherence is not maintained between this and the EXOSAT observations, as the structure of the folded light curves is very different. Thus the periodicity is long lived and stable, but phase coherence is only maintained on timescales of approximately 1 year.
    Keywords: ASTRONOMY
    Type: Goddard Visiting Scientist Program for the Space and Earth Sciences Directorate; 1 p
    Format: text
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  • 6
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    The x ray variability of NGC6814: Power spectra (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Simulation techniques are used to obtain the X-ray variability power spectrum of unevenly sampled GINGA data from NGC6814. A simple power law is not an adequate description of the power spectrum, with the residuals showing excess power on timescales consistent with the periodicity seen in EXOSAT observations of this object. However the shape of the folded lightcurve is very different, with 3 main peaks, two of which are separated by an extremely sharp dip instead of the single peak and small harmonic structure observed by EXOSAT. Using the dip as a fiducial mark, a second GINGA observation of this source taken one year later is found to be consistent with being completely periodic and phase coherent with this first GINGA observation. Thus the period is consistent with being constant over a period of 6 years, but phase coherence is only maintained on timescales of approximately 1 year. Over 75 percent of the total source variability is due to the periodic component (r.m.s. amplitude of 36 percent). The residual variability can be described as the more usual 'flicker noise' f(exp -1.1) powerlaw. This shows no apparent high frequency break on timescales greater than 300 seconds. Subtle differences in the shape of the folded light curve with energy, and the very large amount of power in the periodic component suggest occultation as its origin, though amplification of variability from an X-ray emitting 'hot spot' at the disk inner radius through gravitational lensing is also possible. The former suffers from the very arbitrary nature of the periodic timescale, while the latter is unattractive as it cannot simply explain the lack of high frequency break in the residual power. That these models probably fail to provide an adequate explanation may be due to the added complexity of anisotropy of the X-ray emission, suggested by the discrepancy between the lack of soft photons implied by the flat spectrum and the copious source of soft photons available from reprocessing in the iron line producing material.
    Keywords: ASTRONOMY
    Type: Goddard Visiting Scientist Program for the Space and Earth Sciences Directorate; 2 p
    Format: text
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