1,775 research outputs found

    Mega-City-Regions: on Awareness and Value Chain Approach

    Get PDF
    Mega-City-Regions (MCR) as a new large-scale urban phenomenon have been gaining attention recently: In research, empirical studies address their functional consistency, and spatial planning policies underline the strategic role of MCRs for territorial competition of a country. But increasingly a tension between the functional logic of knowledge-intensive business activities and the territorial and normative approaches of public bodies begin to emerge. Typical conflicts of spatial development in MCRs occur for example when globally motivated investment decisions hit upon the local needs. This paper proposes an integrated view that can help to bridge the gap between the growing factual knowledge about MCRs and the still weak ability to use this knowledge for local and regional development and spatial planning purposes. The proposed integration draws on the one hand from the corporate-based value chain approach: The interaction of analysis of spatio-economic development, its adequate visualization and focussed communication towards stakeholders is apt to bring about the initiating momentum for beneficial spatial development. In the context of a diffuse perception of MCRs – whose mere size surpasses our common notions of space – analysis, visualization and communication as methodological components in the spatial planning process add value to sustainable spatial development. The process starts with creating awareness for the often invisible and complex functions, qualities and identities of the MCR spatial scale. New strategies of visualization and communication are needed to improve insight and motivation of the actors involved. On the other hand this value chain approach has to be adapted to the varying vertical levels of public bodies with their numerous policies. Thus, ñ€Ɠmulti-level-governanceñ€ is to be conceived as a concept to close the gap between the territorial and the functional logic of spatial development. The paper will study this dual approach with the case of the announced expansion of the international airport in Munich. This complex multi-level-governance process experiments with a consensus-oriented dialogue platform – the so called ñ€Ɠneighbourhood conferenceñ€ (NC) – bringing together actors with divers responsibilities and objectives. The NC sits at the interface of global and local objectives that are transformed on the spatial scale of the MCR of Munich. The paper concludes with recommendations for using the above described spatial value chain approach for more efficient multi-level-governance.

    High-mass star formation in southern disk galaxies

    Get PDF
    As part of a major study of the physical processes of star formation and the evolution of galactic discs, the detailed distribution of high-mass star formation within southern late-type spirals and Magellanic-type galaxies is being measured by means of narrow-band imaging in Ha and the continuum, spectroscopic studies of prominent HII regions identified in the Ha images, and by radio mapping in neutral hydrogen and the continuum. The radio mapping will be undertaken with the Southern Hemisphere's first large, multi-frequency synthesis array, the Australia Telescope. Some optical imaging and spectroscopic data has already been acquired; the optical data and some preliminary results are described

    Optimal plans and timing under additive transformations to rewards

    Get PDF
    The nature and role of additive transformations to rewards are elucidated for a general class of deterministic, nonautonomous, optimal control problems with many state and control variables. Conditions relating to the optimal choice of initial and terminal times and initial and terminal values of state variables are identified such that additive transformations affect optimal plans. General comparative static results are derived and the framework is extended to cover two common classes of stochastic control problems. Three applications are presented: the canonical adjustment cost model of a firm, a stochastic extension of an irreversible pollution accumulation problem with regime-switching, and an extension of a lifecycle model of retirement in which an agent\u27s retirement wealth evolves stochastically

    The WiggleZ Dark Energy Survey: final data release and the metallicity of UV-luminous galaxies

    Get PDF
    The WiggleZ Dark Energy Survey measured the redshifts of over 200 000 ultraviolet (UV)-selected (NUV < 22.8 mag) galaxies on the Anglo-Australian Telescope. The survey detected the baryon acoustic oscillation signal in the large-scale distribution of galaxies over the redshift range 0.2 < z < 1.0, confirming the acceleration of the expansion of the Universe and measuring the rate of structure growth within it. Here, we present the final data release of the survey: a catalogue of 225 415 galaxies and individual files of the galaxy spectra. We analyse the emission-line properties of these UV-luminous Lyman-break galaxies by stacking the spectra in bins of luminosity, redshift, and stellar mass. The most luminous (−25mag < M_(FUV) < −22mag) galaxies have very broad HÎČ emission from active nuclei, as well as a broad second component to the [O III] (495.9 nm, 500.7 nm) doublet lines that is blueshifted by 100 km s^(−1) , indicating the presence of gas outflows in these galaxies. The composite spectra allow us to detect and measure the temperature-sensitive [O III] (436.3 nm) line and obtain metallicities using the direct method. The metallicities of intermediate stellar mass (8.8 < log (M*/M⊙) < 10) WiggleZ galaxies are consistent with normal emission-line galaxies at the same masses. In contrast, the metallicities of high stellar mass (10 < log (M*/M⊙) < 12) WiggleZ galaxies are significantly lower than for normal emission-line galaxies at the same masses. This is not an effect of evolution as the metallicities do not vary with redshift; it is most likely a property specific to the extremely UV-luminous WiggleZ galaxies
    • 

    corecore