1,264 research outputs found
PieterjanVerhelst/resident-eel-polder-analysis: Resident eel polder analysis
No full text<p>This is the first release of the R codes for resident eel polder analysis.</p>
Water management Polder 29 Bangladesh
No full textIn this study for a part of Polder 29, one of DDP's pilot polders, it has been determined to which extent the system of channels and structures have a drainage and irrigation capacity which meets the requirements for cultivation of High Yielding Varieties and recommendations have been made how to meet these requirements. Irrigation and drainage requirements are determined by crop characteristics, cultivation practices and climate. The irrigation requirement for High Yielding Varieties for Polder 29 has been determined to be 1.4 l/s.ha (gross requirement), while for the drainage requirement a value of 4.4 l/s.ha was found.WatermanagementCivil Engineering and Geoscience
Dynamical Casimir-Polder forces
No full textWe consider the dynamical (time-dependent) Casimir-Polder force between an atom and a perfectly conducting wall, as well as the dynamical Casimir-Polder force between two atoms in the presence of a boundary condition such as a conducting wall. The dynamical Casimir-Polder forces are obtained from iterative solutions of the Heisenberg equations for the time evolution of the electric and magnetic field operators around one atom in the presence of the conducting wall and related field energy densities, which are valid for any initial state. We consider both the case of an initially bare atomic state and of an initially partially dressed atomic state. The problem of relativistic causality in the field propagation during the atomic self-dressing is also discussed. Finally, we consider a specific model for an atomic partially dressed state and discuss the possibility of experimental observation of the dynamical atom-wall Casimir-Polder force
The Hachirogata Polder: Site Visit Report February/March 2017
No full textThis is a report on the visit of the Hachirogata polder of the author from 28 February 2017 to 2 March 2017. The land reclamation is located in the prefecture of Akita in Japan. The visit consisted of a field trip to the polder accompanied by Prof. Yasunori Kitao (Kyoto Women’s University) with interviews with local people, a visit of the polder museum, a visit to the village Ogata-Mura and the Municipal Office and an interview with Mr. Miyata, who has been mayor for thirty years of the village.Landscape Architectur
Casimir-Polder forces, boundary conditions and fluctuations
No full textWe review different aspects of atom–atom and atom–wall Casimir–Polder forces. We first discuss the role of a boundary condition on the interatomic Casimir–Polder potential between two ground-state atoms, and give a physically transparent interpretation of the results in terms of vacuum fluctuations and image atomic dipoles. We then discuss the known atom–wall Casimir–Polder force for ground- and excited-state atoms, using a different method which is also suited to extension to time-dependent situations. Finally, we consider the fluctuation of the Casimir–Polder force between a ground-state atom and a conducting wall, and discuss possible observation of this force fluctuation
Polder Terminal: A risk based design
No full textNew container ports are mostly constructed on low lying coastal areas or in shallow coastal waters. The quay wall and terminal yard are then raised to a level well above mean sea level to insure safety against inundation. The resulting ‘conventional terminal’ requires large volumes of good quality fill material often dredged from the sea which is costly. Royal HaskoningDHV developed the concept of a container terminal with a “polder yard”. The yard would lie below the outside water level and be surrounded by a combined quay wall flood defense structure. A water drainage system is required to drain excess water from the polder. This master thesis investigates the technical and economic feasibility. Important conditions for the feasibility of a polder terminal are low conductive (impermeable) subsoil, which limit the amount of seepage water entering the polder, and high reclamation cost. The polder terminal is technically feasible; a conceptual design is made for a case study in Tuas, Singapore. The ‘polder terminal’ could save 10 to 25% of the total cost (investment and risk) due to the lower reclamation cost. The exact saving depends on the polder depth which is bounded by uplifting failure of the polder yard. The increase in cost due to the risk of inundation and water drainage system is insufficient to counteract the large savings possible. The investments, risk and total cost of both the conventional and polder terminal are shown in the graph, where the minimum total cost of the polder terminal are lower than those of the conventional terminal.Hydraulic EngineeringCivil Engineering and Geoscience
Dynamical Casimir-Polder forces
No full textWe consider the dynamical Casimir-Polder force on an atom placed near an infinite conducting wall. The system is initially in a non equilibrium configuration such as a bare or a partially dressed state, and its time evolution is considered as well as the time dependence of the atom-wall Casimir-Polder interaction. A possible scheme to generate experimentally the initial partially dressed state and to detect the dynamical Casimir-Polder force is discussed
Veiligheidsberekening van het ComCoastconcept op Breebaart-polder
No full textDit rapport beschrijft een veiligheidsanalyse van het ComCoast-concept voor de BreeBaart-polder te Groningen. Het ComCoast-concept gaat uit van een brede waterkering, waarbij de primaire dijk overslagbestendig is en de achterliggende polder wordt benut voor het opvangen van het overslaande water.Civil Engineering and Geoscience
Polder system Can Tho City: Impact of the urban polder on Can Tho City
No full textVietnam is one of the five countries that is severely affected by the consequences of climate change. The extreme weather conditions and the increase of the sea level results in floods in the Mekong Delta, located in the South of Vietnam. Can Tho city, found in the heart of the Mekong Delta, is one of the cities that copes with water related issues on a regular basis. To be prepared for the future, the environmental and infrastructural issues need to be tackled. The resiliency of Can Tho got included of the World Bank program. The objective of this project of the World Bank is to reduce the flood risk in the urban core area and to improve connectivity between the city centre and the low risk urban growth areas. The structural solutions of the polder will be sluice gates, tidal sluice gates, the construction of river embankment, rehabilitation of the drainage system and constructing two regulation and water retention lakes. Additionally, building dykes with new roads and expanding or building new bridges will increase the connectivity of the city. All these measures will contribute on the resiliency of the city. The aim of this report is to identify the impact of the polder on the city, considering the infrastructural and the hydraulic aspects. To measure the impact, the current situation is simulated into two models, an infrastructure model and a hydraulic model. The results of hydraulic model show whether and when locations are flooded, whereas the aim of the infrastructure model is to identify flows on the network, the connectivity of the city and the flow changes after implementation of the new roads.CIE4061-09 Multidisciplinary Projec
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