Re-imaging the Environment

This paper represents a study of selected visualisation and investigative methods that facilitate the exploration and expression of human emotions and perceptions within real world environments during the design development stages of a project, repositioning exploration and visualisation in spatial design education. It puts forward an outline for an iterative enquiry around human experiences in order to assess the value of alternative cognitive tools for spatial design students in higher education. Established tools such as orthographic drawings, axonometric projections or scale models equip spatial designers with the consistency they need to investigate and represent physical attributes of space but don't always constitute the best methods to explore the perceived environment, even though it is a key contributing factor to the way we experience our surroundings. It is therefore in the interest of design educators to investigate complementary interpretations that enable students to consciously explore less tangible aspects of design such as emotions and multi-sensorial modalities. Projects developed using tools and techniques ranging from digital 2D and 3D image making, photography, film, animation and performance provide an insight into the possibilities offered by exisiting visual technologies as dynamic study devices of human experiences and contribute to the generation of alternative processes in spatial design education

The host galaxies of low luminosity quasars at high redshift

We present VLT/ISAAC near-infrared imaging of the host galaxies of 15 low luminosity quasars at 1 < z < 2. This work complements our studies to trace the cosmological evolution of the host galaxies of high luminosity quasars. The radio-loud (RLQ) and radio-quiet (RQQ) quasars have similar distribution of redshift and luminosity, and together the high and low luminosity quasars cover a large range of the quasar luminosity function. Both RLQ and RQQ hosts resemble massive inactive ellipticals undergoing passive evolution. However, RLQ hosts are systematically more luminous than RQQ hosts, as also found for the high luminosity quasars. The difference in the host luminosity remains the same from z = 2 to z = 0. For the entire set of quasars, we find a correlation between the nuclear and the host luminosities, albeit with a large scatter. The correlation is less apparent for the RQQs than for the RLQs.Comment: 6 pages, 3 figures, to appear in "QSO Hosts: Evolution and Environment", P.D. Barthel, D.B. Sanders, eds., August 2005, Leiden University, New Astr. Re

The Origin of Massive O-type Field Stars. Part II: Field O stars as runaways

In two papers we try to confirm that all Galactic high-mass stars are formed in a cluster environment, by excluding that O-type stars found in the Galactic field actually formed there. In de Wit et al. (2004) we presented deep K-band imaging of 5 arcmin fields centred on 43 massive O-type field stars that revealed that the large majority of these objects are single objects. In this contribution we explore the possibility that the field O stars are dynamically ejected from young clusters, by investigating their peculiar space velocity distribution, their distance from the Galactic plane, and their spatial vicinity to known young stellar clusters. We (re-)identify 22 field O-type stars as candidate runaway OB-stars. The statistics show that ~4% of all O-type stars with V < 8 can be considered as formed outside a cluster environment. Most are spectroscopically single objects, some are visual binaries. The derived percentage for O-type stars that form isolated in the field based on our statistical analyses is in agreement with what is expected from calculations adopting a universal cluster richness distribution with power index of beta = 1.7, assuming that the cluster richness distribution is continuous down to the smallest clusters containing one single star.Comment: 9 pages, 4 figures. Accepted for publication in A&

Re-imaging the future in urban studies and built environment discourse: A neurourbanism perspective

Neurological constructs are being applied in various fields; within urban studies and built environments, neurourbanism stands out. To understand this concept, this study seeks to conduct a scientometric analysis of the concept of neurourbanism. To do so, we gauged the intellectual structure and clarified the influencers and emerging themes while seeking to identify essential gaps in neurourbanism research in urban studies and the built environment. Data were sorted from Dimensions Artificial Intelligence platform because of its reliability in providing the needed dataset accurately, and the Citespace software was used to analyze the data. Our results suggest plurality in explaining the risk factors in urbanicity research, particularly regarding prevalence, incidence, and the general cause of psychosis in urban living. The study also shows that players in the construction sector, such as engineers, town planners, and developers, have not fully grasped how the built environment assists in improving well-being, reducing stress levels of urbanists, assisting migrants in settling into the community, and the general mental wellness of those who live in the city. The study also identified a correlation between urbanization and mental health and added that the main recipient of rapid urban transformation countries does not show leadership in neurourbanism studies

Towards reviving post-Olympic Athens as a cultural destination

This paper examines the effects of global change on the status and qualities of the Greek national capital, Athens, focusing on how they affect the development of cultural tourism in the city. Although Athens constituted one of the most significant destinations for Greek tourism in the past, in recent years it started to weaken. Athens is characterised by a series of problems, among them are the degradation of its environment and quality of life and traffic congestion. However, in terms of tourism development, the Olympic Games helped in re-imaging the city and upgrading its infrastructure. This study based on semi-structured interviews with top officials reveals how global change has affected Athens’ socio-cultural/economic status, identity and image. Despite the tourism policy/planning responses to global changes, Athens’ tourism continues to decline leaving unexplored potential such as its rich cultural heritage, new multicultural identity and the New Acropolis Museum. The paper suggests that cultural elements of capital cities must be multidimensional including a variety of attractions and amenities. The use of cultural heritage assets needs to be in line with global developments in order for cities to effectively leverage heritage for cultural tourism

WFC3 grism confirmation of the distant cluster Cl J1449+0856 at z=2.00: Quiescent and star-forming galaxy populations

We present deep Hubble Space Telescope Wide Field Camera 3 slitless spectroscopic observations of the distant cluster Cl J1449+0856. These cover a single pointing with 18 orbits of G141 spectroscopy and F140W imaging, allowing us to derive secure redshifts down to m_140~25.5 AB and 3sigma line fluxes of 5*10^(-18) erg/s/cm^2. In particular, we were able to spectroscopically confirm 12 early-type galaxies in the field up to z~3, 6 of which in the cluster core, which represents the first direct spectroscopic confirmation of passive galaxies in a z=2 cluster environment. With 140 redshifts in a ~6 arcmin^2 field, we can trace the spatial and redshift galaxy distribution in the cluster core and background field. We find two strong peaks at z=2.00 and z=2.07, where only one was seen in our previously published ground-based data. Thanks to the spectroscopic confirmation of the cluster ETGs, we can now re-evaluate the redshift of Cl J1449+0856 at z=2.00, rather than z=2.07, with the background overdensity being revealed to be sparse and "sheet"-like. This presents an interesting case of chance alignment of two close yet unrelated structures, each one preferentially selected by different observing strategies. With 6 quiescent or early-type spectroscopic members and 20 star-forming ones, Cl J1449+0856 is now reliably confirmed to be at z=2.00. The identified members can now allow for a detailed study of galaxy properties in the densest environment at z=2.Comment: 12 pages, 13 figure

Assessing Quality of Unstructured Data – Insights From a Global Imaging Company

The main objective of this research to understand if previous Data Quality frameworks are still applicable in today’s organisational environment characterised by a wide variety of data types, including the unstructured data. The paper describes a pilot study conducted in a global imaging company with the researchers adopting and re-examining a previously developed data quality framework, used in a number of different research studies for more than a decade. The study focuses on two research questions: Are the existing data quality frameworks developed for highly structured data, still applicable to today’s organisational environment? Do users’ perceptions of data quality change depending on data type? The paper reports on the main findings and offers some suggestions for future research

High Contrast Imaging of the Close Environment of HD 142527 -

Context. It has long been suggested that circumstellar disks surrounding young stars may be the signposts of planets, and still more since the recent discoveries of embedded substellar companions. The planet-disk interaction may create, according to models, large structures, gaps, rings or spirals, in the disk. In that sense, the Herbig star HD 142527 is particularly compelling as, its massive disk displays intriguing asymmetries that suggest the existence of a dynamical peturber of unknown nature. Aims. Our goal was to obtain deep thermal images of the close circumstellar environment of HD 142527 to re-image the reported close-in structures (cavity, spiral arms) of the disk and to search for stellar and substellar companions that could be connected to their presence. Results. The circumstellar environment of HD 142527 is revealed at an unprecedented spatial resolution down to the sub arcsecond level for the first time at 3.8 microns. Our images reveal important radial and azimuthal asymmetries which invalidate an elliptical shape for the disk as previously proposed. It rather suggests a bright inhomogeneous spiral arm plus various fainter spiral arms. We also confirm an inner cavity down to 30 AU and two important dips at position angles of 0 and 135 deg. The detection performance in angular differential imaging enables the exploration of the planetary mass regime for projected physical separations as close as 40 AU. The use of our detection map together with Monte Carlo simulations sets stringent constraints on the presence of planetary mass, brown dwarf or stellar companions as a function of the semi-major axis. They severely constrain the presence of massive giant planets with semi-major axis beyond 50AU, i.e. probably within the large disk's cavity that radially extends up to 145 AU or even further outside.Comment: 8 pages, 7 figures, accepted in A&