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  • 1
    Electronic Resource
    Electronic Resource
    Freezing points and enthalpies of dilute aqueous solutions of tetrahydropyran, 1,3-dioxane, 1,4-dioxane, and 1,3,5-trioxane. Free energies and enthalpies of solute-solute interactions (1981)
    Springer
    Journal of solution chemistry 10 (1981), S. 139-152 
    Details
    ISSN: 1572-8927
    Keywords: Freezing points ; enthalpies ; aqueous solutions ; Gibbs energy ; tetrahydropyran ; 1,3-dioxane and 1,4-dioxane ; 1,3,5-trioxane ; solute-solute interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The enthalpies of dilute aqueous solutions of tetrahydropyran, 1,3-dioxane, 1,4-dioxane, 1,2,5-trioxane, and an equimolal mixture of tetrahydropyran and 1,3,5-trioxane were measured at 25°C and at molalities from about 0.1 to 1.0 mol kg1. The freezing points of the same aqueous solutions (except for 1,3-dioxane) were measured over a similar molality range. The results were used to calculate the enthalpies and Gibbs free energies of the pair-wise interactions of the above solutes in dilute aqueous solutions at 25°C. From these results, the additivity principle proposed by Savage and Wood was used to get the Gibbs free energy and enthalpies of interaction for the ether-ether and ether-methylene groups. Because of the limited number of measurements, the interaction parameters were not determined with great precision. Nevertheless, the standard errors for the predicted enthalpies and Gibbs free energies are quite reasonable. The signs and magnitudes are similiar to those determined for other polar groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00644996
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    Paper (German National Licenses)
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  • 2
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    A high-frequency survey of the southern Galactic plane for pulsars (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Results of an HF survey designed to detect young, distant, and short-period pulsars are presented. The survey detected a total of 100 pulsars, 46 of which were previously unknown. The periods of the newly discovered pulsars range between 47 ms and 2.5 ms. One of the new discoveries, PSR 1259-63, is a member of a long-period binary system. At least three of the pulsars have ages less than 30,000 yr, bringing the total number of such pulsars to 12. The majority of the new discoveries are distant objects with high dispersion measures, which are difficult to detect at low frequencies. This demonstrates that the survey has reduced the severe selection effects of pulse scattering, high Galactic background temperature, and dispersion broadening, which hamper the detection of such pulsars at low radio frequencies. The pulsar distribution in the southern Galaxy is found to extend much further from the Galactic center than that in the north, probably due to two prominent spiral arms in the southern Galaxy.
    Keywords: ASTROPHYSICS
    Type: Royal Astronomical Society, Monthly Notices (ISSN 0035-8711); 255; 401-411
    Format: text
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  • 3
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    The Jodrell bank 'C' pulsar survey - A survey of the northern Galactic plane for rapidly rotating pulsars (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Nearly 1500 sq deg of the northern Galactic plane were surveyed for rapidly rotating pulsars using the 76-m Lovell telescope. The sampling rate was such that there was sufficient nominal sensitivity to detect pulsars with periods as short as 0.6 ms. To overcome the effects of dispersion, scattering, and galactic background radiation, the high frequency of 1420 MHz was used to survey the inner Galaxy, while lower frequencies of 928 and 610 MHz were used for regions further from the Galactic center. PSR 1937 + 21 was detected in the survey, but no new pulsars were discovered. This is consistent with the results of other recent surveys and suggests that rapidly rotating, high-luminosity pulsars are not very common in the Galactic disk.
    Keywords: ASTROPHYSICS
    Type: Royal Astronomical Society, Monthly Notices (ISSN 0035-8711); 254; 257-263
    Format: text
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  • 4
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    A 5.75-millisecond pulsar in the globular cluster 47 Tucanae (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A pulsar with a period of 5.75 ms and a dispersion measure of 25/cu cm pc has been found in the direction of 47 Tucanae. Despite its probable origin as a member of a binary system, timing measurements show that the pulsar is now single. The observed dispersion measure is consistent with the pulsar lying outside the Galactic electron layer and within 47 Tucanae, but it is very different from the value of 67/cu cm pc for the pulsars that were reported recently as being in this globular cluster. It is suggested that the latter pulsars probably do not in fact lie within 47 Tucanae.
    Keywords: ASTROPHYSICS
    Type: Nature (ISSN 0028-0836); 345; 598-600
    Format: text
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  • 5
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    A six year timing solution for PSR B1951 + 32 (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: Six years of pulse time-of-arrival measurements have been collected from observations of the young, fast pulsar PSR B1951 + 32 in the CTB 80 supernova remnant using the Jodrell Bank and Arecibo radio telescopes. The combined data allow for the determination of a phase connected solution between 1987 August 21 and 1993 September 21. This solution provides an accurate rotational ephemeris for high energy x-ray and gamma-ray observations of this source made during the six years of radio timing observations to an accuracy of better than one tenth of a pulse period (4 ms). The pulsar has an activity parameter comparable with the value seen in the Crab pulsar.
    Keywords: ASTROPHYSICS
    Type: The Astronomical Journal (ISSN 0004-6256); 108; 1; p. 175-178
    Format: text
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