GLORIA

GEOMAR Library Ocean Research Information Access

X

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • IOP Publishing  (3)
  • 1
    Online Resource
    Online Resource
    A multiplexed single-photon instrument for routine measurement of time-resolved fluorescence anisotropy
    IOP Publishing ; 1987
    In:  Journal of Physics E: Scientific Instruments Vol. 20, No. 4 ( 1987-04-01), p. 471-473
    Details
    In: Journal of Physics E: Scientific Instruments, IOP Publishing, Vol. 20, No. 4 ( 1987-04-01), p. 471-473
    Abstract: The authors report a new type of instrument, the Edinburgh Instruments Model 2997 differential fluorometer, for the measurement of the decay of fluorescence anisotropy. The instrument incorporates three multiplexed detection channels for simultaneous measurement of two polarised fluorescence decays and the excitation pulse, using time-correlated single-photon counting. This arrangement corrects automatically for temporal and intensity fluctuations of the spark source. A study of the probe 1,6-diphenyl-1,3,5-hexatriene (DPH) in a white oil reveals that the instrument can measure rotational correlation times with subnanosecond time resolution in a third of the time of conventional methods.
    Type of Medium: Online Resource
    ISSN: 0022-3735
    URL: Article
    DOI: 10.1088/0022-3735/20/4/031
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1987
    detail.hit.zdb_id: 2105243-8
    detail.hit.zdb_id: 209222-0
    detail.hit.zdb_id: 1362523-8
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 2
    Online Resource
    Online Resource
    Stabilisation of Sohar’s Sabkha soil using waste gypsum plasterboard
    IOP Publishing ; 2020
    In:  IOP Conference Series: Materials Science and Engineering Vol. 849, No. 1 ( 2020-05-01), p. 012028-
    Details
    In: IOP Conference Series: Materials Science and Engineering, IOP Publishing, Vol. 849, No. 1 ( 2020-05-01), p. 012028-
    Abstract: Sabkha soil are salt-encrusted desert flats typically found in arid regions. Construction developments on naturally occurring Sabkha soils are usually problematic. This study examines the properties of Sabkha soil obtained from Sohar city of Oman. The Sabkha soil samples were further treated with Gypsum obtained from waste plasterboards at varying percentages of 3, 6, 9 and 12 with a view to stabilising the soil. From the results, Sohar Sabkha soil is a poorly graded sand (SP) with AASHTO classification of A-2-7(0), therefore, it is unsuitable for supporting infrastructures in its natural form. The pH test confirms the reaction between Sabkha and Gypsum, while both the compaction and unconfined compression strength (UCS) tests revealed the optimum percentage of gypsum required to enhance the properties of Sabkha soil to be 6%. The California Bearing Ratio (CBR) test yielded a 33.3% increase in CBR value for Sabkha treated with 6% of Gypsum over untreated Sabkha. Overall, a better understanding of sabkha soil and the confirmation of the potential use of Gypsum for its stabilisation was achieved in this study.
    Type of Medium: Online Resource
    ISSN: 1757-8981 , 1757-899X
    URL: Article
    DOI: 10.1088/1757-899X/849/1/012028
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2506501-4
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 3
    Online Resource
    Online Resource
    Impact of Corroded Bars and Spalling on the Bond Strength of Reinforced Concrete Structures
    IOP Publishing ; 2020
    In:  IOP Conference Series: Materials Science and Engineering Vol. 849, No. 1 ( 2020-05-01), p. 012076-
    Details
    In: IOP Conference Series: Materials Science and Engineering, IOP Publishing, Vol. 849, No. 1 ( 2020-05-01), p. 012076-
    Abstract: The mechanism of the composite materials in Reinforced Concrete Structure is such that they both have to undergo the same stress and deformation as the surrounding, so as to prevent discontinuity, slip, or separation of both materials. Bond strength results from a combination of several parameters, such as the mutual adhesion between the concrete and steel interfaces and the pressure of the hardened concrete against the steel bar or wire due to the drying shrinkage of the concrete. A total of 24 singly reinforced beams with plain 10mm and 12mm steel rods were cast for this study. The beams were designed to fail by flexure and to allow bond slips occur before ultimate failure. The spalling effect was simulated by debonding the bars along its entire length with PVC pipes thus restricting concrete and steel contact. The beams are then subjected to flexural test by inducing a point load on its mid span. The results of the investigation reveals a slight increase in the bond strength of about 2.68% with the use of already corroded bars and the bond strength decreased by 39.2% and 81.8% for bars that had 25% and 50% of their perimeters debonded. The increase in bond strength with the use of corroded bars can be ascribed to the increased frictional resistance owing to the corroded bars surface roughness. The loss of bond strength with decrease in contact area was as a result of the bar being unable to resist perpendicular stresses and was easily pushed out of the beam.
    Type of Medium: Online Resource
    ISSN: 1757-8981 , 1757-899X
    URL: Article
    DOI: 10.1088/1757-899X/849/1/012076
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2506501-4
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...