1,230 research outputs found
The IPHAS catalogue of H alpha emission-line sources in the northern Galactic plane
Get PDFWe present a catalogue of point-source H alpha emission-line objects selected from the INT/WFC Photometric Ha Survey (IPHAS) of the northern Galactic plane. The catalogue covers the magnitude range 13 <= r' <= 19.5 and includes Northern hemisphere sources in the Galactic latitude range -5 degrees < b < 5 degrees. It is derived from similar to 1500 deg(2) worth of imaging data, which represents 80 per cent of the final IPHAS survey area. The electronic version of the catalogue will be updated once the full survey data become available. In total, the present catalogue contains 4853 point sources that exhibit strong photometric evidence for Ha emission. We have so far analysed spectra for similar to 300 of these sources, confirming more than 95 per cent of them as genuine emission-line stars. A wide range of stellar populations are represented in the catalogue, including early-type emission-line stars, active late-type stars, interacting binaries, young stellar objects and compact nebulae.
The spatial distribution of catalogue objects shows overdensities near sites of recent or current star formation, as well as possible evidence for the warp of the Galactic plane. Photometrically, the incidence of Ha emission is bimodally distributed in (r' - i'). The blue peak is made up mostly of early-type emission-line stars, whereas the red peak may signal an increasing contribution from other objects, such as young/active low-mass stars. We have cross-matched our H alpha-excess catalogue against the emission-line star catalogue of Kohoutek & Wehmeyer, as well as against sources in SIMBAD. We find that fewer than 10 per cent of our sources can be matched to known objects of any type. Thus IPHAS is uncovering an order of magnitude more faint (r' > 13) emission-line objects than were previously known in the Milky Way
Aluminium scrap refining with fractional layer crystallization
No full textAbstract not availableMechanical Maritime and Materials Engineerin
Wave transmissions at low-crested structures. Stability of tetrapods at front, crest and rear of a low-crested breakwater
No full textThis report is the result of the Master thesis of the author, at Delft University of Technology, Faculty of Civil Engineering. The study was performed at DELFT HYDRAULICS, in cooperation with Boskalis Westminster Dredging BV. Despite the many studies and experiments that have already been performed on the subject of low-crested breakwaters, one has still not yet been able to completely comprehend wave transmission and damage inflicted on breakwaters. The knowledge of the processes occurring at lowcrested breakwaters is still limited. Moreover only a small number of experiments is available. This two-part report is an attempt to contribute to the enhancement of the understanding of the wave transmission at low-crested structures and the stability of low-crested breakwaters with an armour layer of Tetrapods. Part A of this report deals with the derivation of new transmission formulae, Part B deals with stability of Tetrapods at the three segments, Front, Crest and Rear of a low-crested breakwater.Civil Engineering and Geoscience
Brief to Government on library services in the Province of Newfoundland
No full textBrief to Government on Library Services in the Province of Newfoundland, 1974Letter of transmissal -- Summary of recommendations -- Introduction -- Finances -- School and community libraries -- Transfer of public libraries to Department of Education -- Conclusion -- Appendix 'A': Proposed regions -- Appendix 'B': Map showing proposed regional boundaries -- Appendix 'C': School-public library relationshipsA. Noseworthy, Chairman; P.J. Penney, Chief Provincial LibrarianIncludes bibliographical reference
Rainfall-induced slope collapse with coupled material point method
No full textRainfall-induced slope failures are a major category of slope failure, with incidents likely to increase with the predicted escalation of extreme rainfall events. Traditional numerical methods such as the finite element method are often restricted in their applicability to small deformation analyses. Therefore, incomplete descriptions of the failure mechanism and failure consequence may be obtained, due to the evolving deformations and progressive failure being ignored. A one-point, two-phase material point method (MPM) formulation is proposed to consider the influence of rainfall on slope failure. Due to the characteristics of MPM in capturing the large deformations, the complete failure process, from initiation to failure, of a slope subjected to rainfall infiltration is presented. The soil behaviour is described by a Mohr–Coulomb strain-softening model based on Bishop's effective stress. The two-phase analysis shows that the rainfall-affected slope is initially stable, until the soil shear strength reduces due to the reduction of suction in the slope starting from the surface, leading to a superficial failure mode, which in turn leads to a complete slope failure. Friction angle and residual cohesion are shown to play important roles in the development of the slope failure.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Geo-engineeringGeoscience and Engineerin
Coopolis Heksenberg
No full textThe construction of a scenario for the emergence of cooperative that is concerned with the redevelopment of a quartz-sand quarry in the Parkstad Limburg region.ArchitectureArchitecture and The Built Environmen
Co-Building the Rhondda
No full textThis graduation project proposes an architectural process that will revitalise the post industrial area of the Rhondda Valley in South Wales. Through organising the community around new communal reseource spaces they will be empowered to renew their homes though a self-build approach. This will enable the provision of additional space and greater energy efficiency within the homes, which will transform them into wokring spaces suitable for a third industrial age. Once built, these productive dwellings will continue to have a relationship with the community Institute of Builders and Makers which will support the residents in their enterpreneurial aims and serve to continue the renewed relationship between work and society fostered during thr renewal process. Creating a socially and economically successful community will in turn support the Valley wide economy, enabling macro projects such as community energy schemes and the appropriation of empty factory buildings in order to further transform the Valley to have the spatial infrastrucutre needed for the third industrial age.Architecture and The Built EnvironmentArchitectur
Geographic information infrastructure and local land use plans: Research at the development of GII and DURP, and their mutual relation within Dutch municipal organizations
No full textInfrastructure is not only the hardware but encompass many more, such as the people involved. The geographic component of the information gives it extra value, but generating it is very costly. There are many different definitions of GII and it is useful to identify the vital components of which a GII consists. Based on the four GIS dimensions, humanware, orgaware, infoware and technoware different components of a GII can be identified. GII consists of dynamic conditions and possibilities offered to various types of users to generate, share, access, and use geographic information. The infrastructure consists of technical standards, the physical infrastructure, an institutional framework, a financial basis and awareness at the decision making and management levels. GIIs operate at different levels: from corporate to global. The final purpose to develop a GII is to improve decision making. Decisions require information and an optimal GII facilitates the access to current and accurate geographic information. Within governmental organizations the obligated authentic registers will be of increasing importance for the GII. DURP stands for digital exchangeable spatial planning and is setup to modernize the spatial planning process by the Ministry of Housing, Spatial Planning and the Environment. The objectives of the stimulation programme are to make the spatial planning process more effective and efficient through digitalizing of the development, use and exchange of spatial plans, as well as to improve the involvement of citizens and to make the process more transparent. Municipalities are not yet obligated to digitize their local land use plans, but new legislation in the near future is suspected to change this. Digital exchangeable spatial plans consist mainly of geographic information and are used by a lot of users within the municipal organization. Spatial planning on the local level, municipalities, is of great importance. Municipalities are responsible for developing local land use plans, which can be very detailed and have strong judicial value. That is why it is important to have the most up to date local land use plan. The relation between GII and DURP is clearly noticeable here. The characteristics of this relation is the scope of the research. The integration of DURP within a GII will improve the efficiency and effectiveness of the use and development of the spatial plans within the municipal organization. Besides this the existence of a GII could influence the implementation of DURP, as well as DURP could influence the implementation or development of a GII. Between the different municipalities there are strong differences in the implementation of DURP. This all leads to the following research question: How does the implementation and development of geographic information infrastructure within the municipal organization relate to the implementation and development of digital exchangeable spatial plans? Municipal organizations consist of two parts: the political and the official organization. The official organization is usually organized according to the concern model. Specialized decentralized sectors and on top a central concern staff and facilitating services. The sectors are each responsible for specific problem areas, for instance economy or social welfare. Currently most of the municipalities are developing from a company-orientated organization, where the focus is on results and performance to an environmentorientated organization, where the focus is on output and process. ‘Turn over’ of the organization or decompartmentalization of the sectors is needed to be able to serve the citizens in a better way. Based on the two models of Graafland (1993) and Kok and van Loenen (2005), stages of development of geographic information provision within municipalities are identified. Currently most municipalities are developing from the stages ‘local control’ to ‘infrastructure development’ defined by Graafland. Local control is characterized by a development of standards, slight awareness for cooperation and the management level gets involved and tries to formalize internal relations. Infrastructure development is characterized by a start of authentic registers, change of organization and a more top down approach to support development of infrastructure. This transition is a shift from demand driven to supply driven and from controlled bottom-up to controlled top-down. The corresponding stages of the GII development model are from the end of the ‘stand alone’ stage, to ‘exchange and standardization on technical level’ and to the beginning of the stage ‘intermediary’. Finally, when considering information provision within municipal organizations it all turns down to the field of tension between a sector and a corporate approach. The implementation and development of DURP is researched in the selected municipalities. The start of DURP is mainly triggered by external events. Together with the digitizing and making exchangeable of the local land use plans comes standardization. The Information Model Spatial Planning (IMRO) is developed to offer each municipality the same set of standards. Although the IMRO standards leave space open for own interpretation, it is a first step in improving the spatial planning. Many of the investigated municipalities initiated the digitizing together with updating of outdated plans. Municipalities are covered by a large amount of local land use plans, often more than 200. Many plans are joined together, to approximately 30 or 40, and the current situation is recorded. The plans are lay down in object-based geographic information files, in which the regulations and explanations are linked to the planned objects. These projects are mostly supported by the GII coordinating department to help implementing the object-based method of working, together with the ICT department which supports the acquiring and integration of the software. Redesigning of the work processes within the development of a local land use plan and setting up managerial control for the continuation of the standard processes and output are important factors for a successful implementation of DURP. This research did not reveal an observable pattern between the level of development of GII and DURP within the investigated municipalities. The relation must especially be found in human and organizational aspects. Knowledge at the GII coordinating departments has in many cases supported the setup of the digitizing of spatial plans. The object-based method of working, familiar to the GIS community, has caused a culture shock within the departments responsible for spatial planning. Another human aspect is the awareness for sharing geographic information. The possibility of other departments to consult spatial plans through the GII will motivate them to share geographic information as well and to keep the information up-to-date. The vital standardization needed for the digitizing of the spatial plans can be used as an example towards other work processes and information sources. For the generation and dissemination of information through a GII, it is important that all the work processes are optimal designed for the exchange and use of geographic information. Exchange requires standardization. Although there is no relation between the development of the two aspects, GII and DURP are certainly intertwined with each other. The information generated by digital spatial planning is often shared through the GII and a lot of the information required within the spatial planning process is obtained through the GII. In most of the researched municipalities, DURP is integrated within the GII. In other words the GII facilitates an important part of the input and output of information within the spatial planning process.GIMAGeo-information resourcesOTB Research Institute for the Built Environmen
Exploring reciprocal relations between city & country, consumption & production and man & nature in Vrin.
No full textArchitecture and The Built EnvironmentArchitectureDesign as Politic
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