FINITE H-DIMENSION DOES NOT IMPLY EXPRESSIVE COMPLETENESS

Accepted versio

The results of an agricultural analysis of the ERTS-1 MSS data at the Johnson Space Center

The initial analysis of the ERTS-1 multispectral scanner (MSS) data at the Johnson Space Center (JSC), Houston, Texas is discussed. The primary data set utilized was the scene over Monterey Bay, California, on July 25, 1972, NASA ERTS ID No. 1002-18134. It was submitted to both computerized and image interpretative processing. An area in the San Joaquin Valley was submitted to an intensive evaluation of the ability of the data to (1) discriminate between crop types and (2) to provide a reasonably accurate area measurement of agricultural features of interest. The results indicate that the ERTS-1 MSS data is capable of providing the identifications and area extent of agricultural lands and field crop types

Rotation of Coulomb crystals in a magnetized inductively coupled complex plasma

Under suitable conditions, micron-sized dust particles introduced into inductively coupled argon plasma form a stable microscopic crystal lattice, known as a Coulomb (or plasma) crystal. In the experiment described, an external axial magnetic field was applied to various configurations of Coulomb crystal, including small crystal lattices consisting of one to several particles, and large crystal lattices with many hundreds of particles. The crystals were observed to rotate collectively under the influence of the magnetic field. This paper describes the experimental procedures and the preliminary results of this investigation

Co-crystallisation of cytosine with 1,10-phenanthroline: computational screening and experimental realisation

Attempts to co-crystallise the nucleobases adenine, thymine, guanine, and cytosine with 1,10-phenanthroline by ball milling and solvent evaporation methods are described. A 1:1 co-crystal of cytosine and 1,10-phenanthroline can be obtained by grinding or by solvent evaporation. The structure contains two crystallographically independent cytosine and two independent 1,10-phenanthroline molecules (Z′ = 2). The cytosine molecules form two similar but crystallographically independent hydrogen-bonded chains, while the 1,10-phenanthroline molecules are arranged in π-stacks. Between the chains of cytosine and the π-stacks exist N-H⋯N and C-H⋯N interactions. Crystal structure prediction (CSP) calculations were applied to all four systems to assess their potential for co-crystallisation as well as the likely structures and intermolecular interactions that could result from co-crystallisation. Calculations on the cytosine system demonstrate that co-crystallisation results in a lower energy than the crystalline forms of the two starting materials, in line with the co-crystal formation observed. For the systems which did not form a co-crystal, CSP was used to explore potential packing arrangements, but found none which were lower in energy than that of the pure crystalline forms. In these cases there is significant disruption to the nucleobase hydrogen bonding between the pure compound and the hypothetical co-crystal. For pure adenine and guanine, the hydrogen-bonded ribbons form sheets which must be broken, whereas for thymine, the lack of hydrogen bond donors does not allow the hydrogen bonding present for pure thymine to be maintained while forming thymine-1,10-phenanthroline hydrogen bonds

2s Hyperfine Structure in Hydrogen Atom and Helium-3 Ion

The usefulness of study of hyperfine splitting in the hydrogen atom is limited on a level of 10 ppm by our knowledge of the proton structure. One way to go beyond 10 ppm is to study a specific difference of the hyperfine structure intervals 8 Delta nu_2 - Delta nu_1. Nuclear effects for are not important this difference and it is of use to study higher-order QED corrections.Comment: 10 pages, presented at Hydrogen Atom II meeting (2000

Clinical stakeholders' opinions on the use of selective decontamination of the digestive tract in critically ill patients in intensive care units : an international Delphi study

Peer reviewedPublisher PD

Identity and Ruins: Personal Integration and Urban Disintegration Understood Through a Touristic Lens

In the 1970s, scholars of the (natural and built) environment tended to explore the deep connections between personal identity and the landscape, defined as “the arrangement in physical space of artefacts and activity,” with reference to relatively stable and traditional phenomena such as family, religion, and social structures. While it was acknowledged that humans engage in relational processes with their environment(s) and that individual and social identity can alter as a result of changes in the physical setting in which it was acted out, the normative dimensions of human interactions with spaces and the consensus meanings associated with what James S. Duncan, Jr called “very public landscapes” received disproportionate attention. This contrasted sharply with the radical approach adopted by scholars of tourism in the very same decade. For example, Dean MacCannell deconstructed the physical environments that tourists interacted with in terms of artificially constructed “attractions” and “staged authenticity,” and Erik Cohen connected tourism to religious journeys and pilgrimage through his development of a five-dimension typology of ‘tourist experiences,’ which distinguished tourists in terms of their relationship with a ‘centre.’ Fascinatingly, Cohen’s typology turned on the degree to which personal identity was determined by adherence to a centre, and the issue of whether that centre was the centre of the tourist’s own society, and the extent to which “modern man … [is] normally a conformist.” These pioneering observations of MacCannell and Cohen have grown in relevance as the social sciences have strongly asserted the primacy of the self in Western late modernity, and the decline of traditional institutions as authorities for personal identity, religion, spirituality, and as sources from which the self is constructed