Searched for: subject:"excitations"
(1 - 20 of 30)

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Malkamäki, Marja (author), bos, A.J.J. (author), Dorenbos, P. (author), Lastusaari, Mika (author), Rodrigues, Lucas C.V. (author), Swart, Hendrik C. (author), Hölsä, Jorma (author)
BaAl<sub>2</sub>O<sub>4</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup> is related, both by structure and luminescence, to one of the best persistent luminescent phosphors, SrAl<sub>2</sub>O<sub>4</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup>. At room temperature (RT), the green persistent emission of BaAl<sub>2</sub>O<sub>4</sub>:Eu<sup>2+</sup>,Dy<sup>3+<...
journal article 2020
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SoltanRezaee, Masoud (author), Bodaghi, Mahdi (author), Farrokhabadi, Amin (author), Hedayati, R. (author)
The main objective of this research is to provide a general nonlinear model of adjustable piezoelectric microwires with the ability to tune the stability conditions. In order to increase the controllability and improve system characteristics, only a part of the substrate is electrostatically actuated and the piezoelectric voltage is also...
journal article 2019
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Moyo, Welldone (author), Chaukura, Nhamo (author), Msagati, Titus A.M. (author), Mamba, Bhekie B. (author), Heijman, Sebastiaan (author), Nkambule, Thabo T.I. (author)
This study presents an investigation on the fate of natural organic matter (NOM) and its dynamics throughout the treatment train at various drinking water treatment plants (WTP) in South Africa. The characteristics, concentration and removal efficiencies of NOM at various treatment stages on the basis of dissolved organic carbon, UV...
journal article 2019
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Grimaldi, G. (author), Geuchies, J.J. (author), van der Stam, W. (author), du Fossé, I. (author), Brynjarsson, Baldur (author), Kirkwood, N.R.M. (author), Kinge, S.S. (author), Siebbeles, L.D.A. (author), Houtepen, A.J. (author)
In transient absorption (TA) measurements on Cd-chalcogenide quantum dots (QDs), the presence of a band-edge (BE) bleach signal is commonly attributed entirely to conduction-band electrons in the 1S(e) state, neglecting contributions from BE holes. While this has been the accepted view for more than 20 years, and has often been used to...
journal article 2019
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Rasooli, A. (author), Itard, L.C.M. (author)
Accurate determination of walls' thermo-physical characteristics is a necessity for execution of energy conservation strategies in existing buildings. In practice, such data is not available because the current determination methods are time expensive and therefore rarely used. Based on the theory of Response Factors, a rapid transient in...
journal article 2019
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Yanai, S. (author)
In this thesis, the microwave detection of mechanically compliant objects is investigated. This starts with a system of a suspended metal drum capacitively coupled to a high impedance microstrip resonator. The mechanical non-linear dissipation of the drums is studied. Next, a suspended nanowire coupled to a CPW resonator is studied. With an...
doctoral thesis 2018
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Versteijlen, W.G. (author), Renting, F.W. (author), van der Valk, P. L.C. (author), Bongers, J.L.C. (author), van Dalen, K.N. (author), Metrikine, A. (author)
In an attempt to decrease the modelling uncertainty associated with the soil-structure interaction of large-diameter monopile foundations, a hydraulic shaker was used to excite a real-sized, in-situ monopile foundation in stiff, sandy soil in a near-shore wind farm. The response in terms of natural frequency and damping of a pile-only system...
journal article 2017
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Van der Male, P. (author), Van Dalen, K.N. (author), Metrikine, A. (author)
In determining wind forces on wind turbine blades, and subsequently on the tower and the foundation, the blade response velocity cannot be neglected. This velocity alters the wind force, which depends on the wind velocity relative to that of the blades This blade response velocity component of the wind force is commonly referred to as added...
conference paper 2014
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Westig, M.P. (author), Selig, S. (author), Jacobs, K. (author), Klapwijk, T.M. (author), Honingh, C.E. (author)
In this paper, we demonstrate experimentally the implementation of a niobium-trilayer junction with an aluminum-oxide tunnel barrier, embedded in a high-gap superconducting niobium-titanium-nitride circuit. Previously reported heating by quasiparticle trapping is removed by inserting a normal metal layer of gold between the niobium junction and...
journal article 2013
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Baghoth, S.A. (author)
Natural organic matter (NOM) generally influences water treatment processes such as coagulation, oxidation, adsorption, and membrane filtration. NOM contributes colour, taste and odour in drinking water, fouls membranes, serves as a precursor for disinfection by-products, increases the exhaustion and usage rate of activated carbon and may...
doctoral thesis 2012
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Zyazin, A.S. (author)
doctoral thesis 2012
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Seldenthuis, J.S. (author)
In single-molecule junctions, the behavior of a device is determined by the properties of an individual molecule. In this thesis we develop several models to describe both electrical and mechanical effects in such devices, which can be used to design molecules with a specific functionality. We show how the resistance of a molecule varies with...
doctoral thesis 2011
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Patwardhan, S. (author)
The field of organic electronics has been thriving for the last decades due to growing commercial interest. One of the advantages of using organic materials as semiconductors is the possibility to tune their optoelectronic properties by modifying the chemical structure and organization of the building blocks. In this thesis, the properties of...
doctoral thesis 2011
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Osorio Oliveros, E.A. (author)
This thesis describes three-terminal transport measurements through single molecules. The interest in this field stems from the dream that single molecules will form the building blocks for future nanoscale electronic devices. The advantages are their small size -nanometers-, and their synthetic tailorability which allows the molecules to be...
doctoral thesis 2009
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Christova, C.G. (author), Stouwdam, J.W. (author), Eijkemans, T.J. (author), Silov, A.Y. (author), Van der Heijden, R.W. (author), Kemerink, M. (author), Janssen, R.A.J. (author), Salemink, H.W.M. (author)
Remarkable photoluminescence enhancement (PLE) in submonolayer films of PbSe nanocrystals (NCs) upon continuous illumination was observed. The intensity increase from films on InP substrates was highest in vacuum, while for films on Si/SiO2 substrates the PLE was stronger in air. The magnitude of the PLE was found to depend on the excitation...
journal article 2008
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Van der Kolk, E. (author), Dorenbos, P. (author), Krämer, K. (author), Biner, D. (author), Güdel, H.U. (author)
journal article 2008
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Pavlov, S.G. (author), Hübers, H.W. (author), Böttger, U. (author), Zhukavin, R.K. (author), Shastin, V.N. (author), Hovenier, J.N. (author), Redlich, B. (author), Abrosimov, N.V. (author), Riemann, H. (author)
Raman-type stimulated emission at frequencies between 5.0 and 5.2?THz as well as between 6.1 and 6.4?THz has been realized in silicon crystals doped by phosphorus donors. The Raman laser operates at around 5?K under optical excitation by a pulsed, frequency-tunable infrared free electron laser. The frequencies of the observed laser emission are...
journal article 2008
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Dorenbos, P. (author)
A mechanism of persistent luminescence that was proposed in 1996 for SrAl2O4:Eu2+;Dy3+ has been widely adopted to explain afterglow in many Eu2+ and Dy3+ codoped aluminates and silicates. The mechanism involves the thermally activated release of a hole from Eu2+ in its excited 5d state to the valence band which is subsequently trapped by Dy3+....
journal article 2005
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Mohanty, P. (author)
The dynamic behavior of structures is a primordial factor determining its structural stability, reliability and lifespan. Therefore, in many advanced engineering applications, it has become essential to predict the dynamics of new designs through simulations, to identify the dynamic characteristics of prototypes and finally to monitor systems in...
doctoral thesis 2005
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Elzerman, J.M. (author), Hanson, R. (author), Willems van Beveren, L.H. (author), Vandersypen, L.M.K. (author), Kouwenhoven, L.P. (author)
We demonstrate a method for measuring the discrete energy spectrum of a quantum dot connected very weakly to a single lead. A train of voltage pulses applied to a metal gate induces tunneling of electrons between the quantum dot and a reservoir. The effective tunnel rate depends on the number and nature of the energy levels in the dot made...
journal article 2004
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