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  • 1
    Electronic Resource
    Electronic Resource
    Critical Concentrations for the Orientational Ordering of Molecular Hydrogen in 2D (1998)
    Springer
    Journal of low temperature physics 113 (1998), S. 705-710 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recent NMR studies of molecular hydrogen physisorbed on hexagonal boron nitride have been used to determine the phase diagram for the different types of orientational ordering in 2D. Long range pinwheel orientational ordering is only observed for ortho concentrations greater than a critical concentration of 69±3% for the commensurate solid $$\sqrt {\text{3}} \times \sqrt {\text{3}}$$ structure. The increase in the critical concentration for long range ordering of quantum quadrupoles from 55% in 3D to 69% in 2D is discussed in terms of theories of the ordering that include treatments of the correlations between the ortho molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022505611990
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    New Phases for the Orientational Ordering of Quantum Rotors: H2 on Hexagonal BN (1998)
    Springer
    Journal of low temperature physics 111 (1998), S. 533-543 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The phase diagram for the orientational ordering of 2D films of ortho–para H 2 mixtures has been explored for both commensurate and incommensurate monolayer coverages on hexagonal BN. NMR techniques were used to study ortho concentrations 0.30〈x〈0.74and temperatures 0.05 〈T〈4.2. Three distinctly different classes of line shapes were observed and we interpret these in terms of the different phases predicted for the orientational ordering in 2D. At high concentrations a Pake doublet line shape was observed which is characteristic of the pinwheel (PW) ordering predicted by Harris and Berlinsky. For intermediate concentrations a distinctive helmet shaped NMR line is observed which is the signature of a quadrupolar glass state. This line shape was seen only for commensurate coverages. At low concentrations (x〈0.45) a new very sharply defined Pake doublet shape is seen which corresponds to a very narrow distribution of order parameters. We interpret this latter phase as a herringbone (HB) ordering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022237131086
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  • 3
    Electronic Resource
    Electronic Resource
    Orientational Ordering in Ultra-Thin Films of Quantum Rotors on Boron Nitride (1998)
    Springer
    Journal of low temperature physics 110 (1998), S. 597-602 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report the results from NMR studies of submonolayer and monolayer films of solid hydrogen (corresponding to the expected $$\sqrt 3 \times \sqrt 3 $$ commensurate and incommensurate solid, respectively) on a well defined insulating substrate (boron nitride). The orientational ordering of the ortho-H2 molecules (J=1 quantum rotors) was explored for ortho-H 2 concentrations 0.3〈X〈0.74 and temperatures 0.05〈T〈4.2 K. The phase diagram for submonolayer hydrogen films (75% of full monolayer) has been identified in terms of X and T from clear structural changes of the NMR spectra, including the observation of a new 2D orientational quadrupolar glass ordering for 0.48〈X〈0.69 and 0.2≤T≤0.6 K. Two distinct long range orientationally ordered phases are identified for monolayer hydrogen films: an expected pinwheel lattice structure for high X and an expected herringbone structure for low X.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022579404858
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  • 4
    Electronic Resource
    Electronic Resource
    Orientational Ordering in Monolayer Films of Molecular Hydrogen on Boron Nitride (1999)
    Springer
    Journal of low temperature physics 114 (1999), S. 173-201 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract NMR studies of monolayer hydrogen films for both the expected $$\sqrt {\text{3}} \times \sqrt {\text{3}} $$ commensurate solid and the incommensurate solid (for full monolayer coverage) on hexagonal boron nitride (BN) are reported for ortho-H 2 concentrations 0.30≤X≤0.74 and temperatures 0.08〈T〈4.2 K. Phase diagrams for these systems are mapped out in terms of X and T from clear structural changes of the NMR spectra, including the observation of a 2D orientational quadrupolar glass ordering for X〈X crit =0.69, and long range orientational ordering for X〉X crit for commensurate films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021858021708
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  • 5
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    List of coral species with codes from nearshore reefs in Guam in 2014 (Reef Resilience in Guam project) (2021)
    Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu
    Details
    Publication Date: 2022-05-26
    Description: Dataset: Species list
    Description: List of coral species with codes surveyed at stations from nearshore reefs in Guam in 2014. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/639865
    Description: NSF Division of Ocean Sciences (NSF OCE) OCE-1418673
    Repository Name: Woods Hole Open Access Server
    Type: Dataset
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  • 6
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    Underwater fluorescence on nearshore reefs in Guam during 2014 (Reef Resilience in Guam project) (2021)
    Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu
    Details
    Publication Date: 2022-05-26
    Description: Dataset: PAM fluorescence
    Description: Maximum excitation pressure of Symbiodinium assemblages was assessed as an indicator for holobiont photosynthetic performance of Pocillopora damicornis in shallow (1-2m), back reef and P. eydouxi in deeper fore reef (〉3m). For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/639986
    Description: NSF Division of Ocean Sciences (NSF OCE) OCE-1418673
    Repository Name: Woods Hole Open Access Server
    Type: Dataset
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  • 7
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    Coral surveys from the nearshore reefs in Guam during 2014 (Reef Resilience in Guam project) (2021)
    Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu
    Details
    Publication Date: 2022-05-26
    Description: Dataset: Colony monitoring
    Description: Coral surveys from the nearshore reefs in Guam during 2014. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/639899
    Description: NSF Division of Ocean Sciences (NSF OCE) OCE-1418673
    Repository Name: Woods Hole Open Access Server
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  • 8
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    Coral health survey from the nearshore reefs in Guam during 2014 (Reef Resilience in Guam project) (2021)
    Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu
    Details
    Publication Date: 2022-05-26
    Description: Dataset: Coral health survey
    Description: Coral health survey from the nearshore reefs in Guam during 2014. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/639879
    Description: NSF Division of Ocean Sciences (NSF OCE) OCE-1418673
    Repository Name: Woods Hole Open Access Server
    Type: Dataset
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  • 9
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    Visual substrate classification along transects from the nearshore reefs in Guam during 2014 (Reef Resilience in Guam project) (2021)
    Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu
    Details
    Publication Date: 2022-05-26
    Description: Dataset: Line Intercept Substrate Surveys
    Description: Visual survey of substrate types along transects 10 m x 5 contiguous segments. Substrates were classified along the transects at 50 cm intervals from the nearshore reefs in Guam during 2014. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/640007
    Description: NSF Division of Ocean Sciences (NSF OCE) OCE-1418673
    Repository Name: Woods Hole Open Access Server
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  • 10
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    Temperature and light intensity at 7 locations from the nearshore reefs in Guam during 2014 (Reef Resilience in Guam project) (2021)
    Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu
    Details
    Publication Date: 2022-05-26
    Description: Dataset: Temperature and Light
    Description: Temperature and light intensity data from seven locations from the nearshore reefs in Guam, January to August 2014. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/640026
    Description: NSF Division of Ocean Sciences (NSF OCE) OCE-1418673
    Repository Name: Woods Hole Open Access Server
    Type: Dataset
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