radiation technology | Scholarship for Nigerians and Africans

PhD’s in Measuring, Modelling and Monitoring Chloride Ingress in Cracked Concrete, Netherlands

The Department of Applied Physics at Eindhoven University of Technology has 15 professorial chairs with about 65 academic and 60 technical specialists, as well as 110 graduate and 375 undergraduate students. The leading research themes cover functional materials, transport physics, and plasma physics and radiation technology. The department has extensive national and international partnerships, including industrial partners. It participates in several national (top) research schools, and in two national top technology institutes: Dutch Polymer Institute (DPI) and Materials Innovation Institute (M2i). Eindhoven University of Technology is one of the three participants in the Dutch 3TU Federation of Universities of Technology.

The major degradation mechanism in concrete structures is corrosion of reinforcement due to chloride penetration. Corrosion reduces serviceability and safety due to cracking and spalling of concrete and loss of steel cross section. Recently, service life design has moved from prescriptive to model and performance based. The current approach aims at postponing initiation of corrosion until the end of the required service life with a predetermined reliability, based on simplified modelling of transport in uncracked concrete and testing of laboratory samples for chloride diffusion. Real structures under service load contain cracks and execution defects. Cracks are fast transport routes for chloride, but the effect is mitigated by poorly known mechanisms such as self-healing and crack blocking. Current models do not cover the effect of cracks, voids and compaction defects in concrete on chloride transport and corrosion initiation, rendering them less robust than acceptable.

This projects aims at understanding of mechanisms that control chloride transport, and the influence of cracks on the transport. To study the transport of chloride and other relevant substances in concrete a non-destructive, high temporal and spatial resolution nuclear magnetic resonance (NMR) setup capable of quasi-simultaneously measuring Na, Cl and moisture will be developed within this project.

Requirements:

We welcome candidates who hold a Master’s degree in (technical, applied) physics, chemistry, materials science, civil engineering (materials) or a related field, have affinity with materials science, transport in porous media and/or durability of concrete and have hands-on experience with experimental work.

Starting date:

As soon as possible.

Appointment:

This position offers full-time employment for 4 years, with an initial evaluation period. The monthly (gross) salary will be approx. 2000 Euro in the first year and increase to approx. 2600 Euro in the fourth year, in accordance with the Collective Labour Agreement of the Dutch Universities. The University offers an attractive package of fringe benefits such as excellent technical infrastructure, child care, savings schemes and excellent sports facilities.

Application:

Please submit contact information, an motivation letter, contact information of two or more references (including a research supervisor), and a copy of the M.Sc-thesis and other relevant publications, if available by using the apply button given in the link mention below:

Application Deadline: 31-10-2010

Further scholarship details:

Read more: http://scholarship-positions.com/phds-in-measuring-modelling-and-monitoring-chloride-ingress-in-cracked-concrete-netherlands/2010/09/04/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+ScholarshipPositions+%28International+Scholarships+and+Financial+Aid+Positions%29&utm_content=Yahoo%21+Mail#ixzz0zhYUHoi7

2 PhD Positions: Modelling, Non-destructive Testing and Li-based Remediation, Netherlands

The Department of Applied Physics at Eindhoven University of Technology has 15 professorial chairs with about 65 academic and 60 technical specialists, as well as 110 graduate and 375 undergraduate students. The leading research themes cover functional materials, transport physics, and plasma physics and radiation technology. The department has extensive national and international partnerships, including industrial partners. It participates in several national (top) research schools, and in two national top technology institutes: Dutch Polymer Institute (DPI) and Materials Innovation Institute (M2i). Eindhoven University of Technology is one of the three participants in the Dutch 3TU Federation of Universities of Technology.

Degradation of concrete structures due to ASR (Alkali-Silica Reaction) is a complex mechanism based on chemical reactions between alkalis and reactive silica and transport of reaction products and water. The underlying mechanisms are poorly understood and presently there is no model for the development of damage. Lithium ions are known to positively affect the degradation process but the mechanism is not understood. Electrochemically driving Li into concrete may provide a method for remediation of existing ASR affected structures.

This combined project aims to largely improve service life assessment and preservation of concrete structures with regard to ASR by elucidating the degradation process and the influence of Li at the microscopic level up to providing a potential remediation method at the macro level that stops further decay. Hence 2 PhDs are sought for studying:
– micro level on the fundamentals of ASR, the influence of Li
– meso level non-destructive testing of transport of water, Na and Li using NMR

Requirements:

We welcome candidates who hold a Master’s degree in (technical, applied) physics, chemistry, materials science, civil engineering (materials) or a related field, have affinity with materials science, transport in porous media and/or durability of concrete and have hands-on experience with experimental work.

Starting date:

As soon as possible.

Appointment:

This position offers full-time employment for 4 years, with an initial evaluation period. The monthly (gross) salary will be approx. 2000 Euro in the first year and increase to approx. 2600 Euro in the fourth year, in accordance with the Collective Labour Agreement of the Dutch Universities. The University offers an attractive package of fringe benefits such as excellent technical infrastructure, child care, savings schemes and excellent sports facilities.

Application:

Please submit contact information, an motivation letter, contact information of two or more references (including a research supervisor), and a copy of the M.Sc-thesis and other relevant publications, if available by using the apply button given in the website link.

Application deadline: 31-10-2010

Further scholarship details:

Read more: http://scholarship-positions.com/2-phd-positions-modelling-non-destructive-testing-and-li-based-remediation-netherlands/2010/09/04/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+ScholarshipPositions+%28International+Scholarships+and+Financial+Aid+Positions%29&utm_content=Yahoo%21+Mail#ixzz0zhXLEphd

PhD-Position, ‘Numerical flow Simulation of Atmospheric Nocturnal Wind Bursts’, Netherlands

The Department of Applied Physics at Eindhoven University of Technology has 15 professorial chairs with about 65 academic and 60 technical specialists, as well as 110 graduate and 375 undergraduate students. The leading research themes cover functional materials, transport physics, and plasma physics and radiation technology. The department has extensive national and international partnerships, including industrial partners. It participates in several national (top) research schools, and in two national top technology institutes: Dutch Polymer Institute (DPI) and Materials Innovation Institute (M2i). Eindhoven University of Technology is one of the three participants in the Dutch 3TU Federation of Universities of Technology.

The project aims to solve a long-standing problem in boundary layer meteorology: to find the physical mechanism that drives intermittent (discontinuous) turbulence in the atmospheric nocturnal boundary layer. During intermittency, periods with ‘laminar’ flow are interrupted by chaotic bursts of turbulence and a significant transport of heat, moisture and momentum occurs. Bursts also act as an efficient ‘venting’-mechanism of pollutants that usually accumulate in quiet periods. The problem is highly relevant in weather and climate prediction and for air pollution problems. Current nocturnal boundary layer parameterizations are highly empirical and lead to significant errors in weather and climate predictions, especially in arctic regions.

The candidate will perform numerical simulations of stably stratified channel flows (with a Direct Numerical Simulation model). Different numerical experiments will be set up. The aim is to start with simplified studies and then increase the complexity of the simulations as to mimic atmospheric flows. Thus we start from non-interactive surface boundary conditions towards simulations that mimic (rudimentary) atmosphere-vegetation interactions. The outcome of the simulations will be used to develop a theoretical framework to predict this intermittence character of turbulence (using hydrodynamic stability analysis). Finally, results will be compared with readily available observations that were obtained in the outside atmospheric nocturnal boundary layer.

Requirements recent or impending MSc-degree in Physics, Mathematics, Meteorology or Mechanical Engineering with a special focus on fluid mechanical topics. Experience with numerical flow simulation (LES, or DNS) is a clear advantage. Finally, the candidate should have some interest in geophysical flows and be willing to follow courses on this topic if necessary.

Application Deadline 30-09-2010

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