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University of Twente Publications (57.936 recursos)

University of Twente Repository provides publications of UT scientific staff, in many cases full text and publicly available.

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Mostrando recursos 1 - 20 de 25.127

  1. A temporal perspective on phronetic strategizing: exploring strategy making im unsettled times

    Loohuis, Raymond; Ehrenhard, Michel

  2. Editorial "Special Issue on Loyalty, Flaming, Reputation and Symmetry in Web Based Communities"

    Kommers, Piet; Simmerling, Margriet

  3. Integration of unobserved effects in generalised transport access costs of cycling to railway stations

    La Paix Puello, L.C.; Geurs, K.T.
    This paper focuses on the spatial influence of High-Speed Rail stations, based on the notion of catchment area. Given the features of High-Speed Rail, its operations can and must serve a role beyond the station and the city in which it is located. Using a spatial systemic approach, this paper proposes a method to analyse the factors that may affect the size and shape of the catchment areas according to the relationship between distance and ridership. This study employs data from surveys of six stations of the Spanish high-speed rail system to apply the model and demonstrates that the context...

  4. Special Issue: Advances in the measurement of transport impedance in accessibility modelling.

    Geurs, K.T.; Östh, J.

  5. Lubrication in cold rolling: numerical simulation using multigrid techniques

    Lugt, Piet M.
    In the cold rolling process a lubricant is applied on the rolls and/or the strip mate­rial. Due to the velocities of the rolls and the strip, part of the lubricant is sheared into the contact causing, amongst others, a reduction of the friction. In this thesis a physical-mathematical model is described which makes it possible to predict the quantity of lubricant between roll and strip. From this, a number of statements can be made relating to the friction between the roll and the strip. After a short description of the process, an overview is presented of previous re­ search in this field....

  6. Compression molding of chopped woven thermoplastic composite flakes

    Abdul Rasheed, Mohammed Iqbal
    Continuous fiber reinforced composites with high-performance thermoplastic polymer matrices have an enormous potential in terms of performance, production rate, cost efficiency and recyclability. The use of this relatively new class of materials by the aerospace and automotive industry has been growing steadily during the last decade. However, the use of continuous reinforcements limit the complexity of the shape of the end products, as defects such as wrinkles can form during processing. Moreover, a significant amount of process waste is generated, which lowers the efficiency of the conventional production processes involving a prepreg cutting stage and/or final trimming stages. The overall efficiency...

  7. Molecular monolayers for doping silicon: from doping dose control to device applications

    Ye, Liang
    The evolution of the semiconductor industry calls for new techniques to address the challenges arising from the downscaling trend known as Moore’s law, which has brought electronic devices into the nano-regime. Monolayer doping (MLD) is an interesting alternative for the currently mostly employed ion implantation to introduce a dopant into silicon. The MLD technique is capable of forming ultra-shallow doping without causing crystal damage to the substrate. It is also capable of doping non-planar surfaces. In this thesis, we have addressed a variety of conceptual novelties to MLD. We demonstrated the tuning down of the doping level using the mixed-monolayer doping concept and...

  8. Control of resonances in photonic crystal waveguides

    Lian, Jin
    Photonic crystal waveguides (PhCWG) with intentional defects and unavoidable disorder exhibit high quality factor (Q) resonances. Single- and multi-resonance systems based on them are suitable for applications such as optical memories, delay lines and cavity QED. Therefore, characterization, control and investigation of the optical properties of these resonances will pave the way to their applications. The aim of this thesis is to provide theories and models to explain the transmission, reflection and dispersion spectra of these resonances, and to develop experimental methods to probe and control these resonances. The theoretical investigation in this thesis explore methods of calculating the key parameter...

  9. The COPD-SIB: a newly developed disease-specific item bank to measure health-related quality of life in patients with chronic obstructive pulmonary disease

    Paap, Muirne C.S.; Lenferink, Lonneke I.M.; Herzog, Nadine; Kroeze, Karel; Palen, Job van der
    Background Health-related quality of life (HRQoL) is widely used as an outcome measure in the evaluation of treatment interventions in patients with chronic obstructive pulmonary disease (COPD). In order to address challenges associated with existing fixed-length measures (e.g., too long to be used routinely, too short to ensure both content validity and reliability), a COPD-specific item bank (COPD-SIB) was developed. Methods Items were selected based on literature review and interviews with Dutch COPD patients, with a strong focus on both content validity and item comprehension. The psychometric quality of the item bank was evaluated using Mokken Scale Analysis and parametric Item Response Theory,...

  10. Doxing: a conceptual analysis

    Douglas, David M.
    Doxing is the intentional public release onto the Internet of personal information about an individual by a third party, often with the intent to humiliate, threaten, intimidate, or punish the identified individual. In this paper I present a conceptual analysis of the practice of doxing and how it differs from other forms of privacy violation. I distinguish between three types of doxing: deanonymizing doxing, where personal information establishing the identity of a formerly anonymous individual is released; targeting doxing, that discloses personal information that reveals specific details of an individual’s circumstances that are usually private, obscure, or obfuscated; and delegitimizing...

  11. Soft ceramics for high temperature lubrication: graphite-free lubricants for hot and warm forging of steel

    Gonzalez Rodriguez, Pablo
    The main research focus of this thesis is on the development of the next generation of solid lubricants for high temperature forming of steel. These lubricants are based on ceramic nanoparticles which are more resistant to temperature and oxidation than traditional lubricants. Nowadays, the most common products are aqueous suspensions of graphite, molybdenum disulfide or polytetrafluoroethylene (TeflonTM). Nevertheless, some problems are associated to their use, for instance pitting corrosion on the steel surface caused by partial decomposition of the lubricants at high temperature, and, more in general, a dirty working environment. Advanced inorganic solid lubricants were developed to overcome these problems....

  12. Hierarchical aelf-assembly of alpha-synuclein: from disease to materials

    Semerdzhiev, Slav

  13. On the friction of thin film rigid disks

    Visscher, Harm

  14. Stokes flow in thin films

    Odyck, Daniel Ernst Albert van

  15. Numerical modelling of self-acting gas lubricated bearings with experimental verification

    Stegen, Ronald Hendri Michel van der

  16. Friction in sheet metal forming, the influence of (local) contact conditions and deformation

    Haar, Rudi ter

  17. Transitions in the lubrication of concentrated contacts

    Schipper, Dirk Jan

  18. Thermally induced wear transition in ceramics

    Metselaar, Hendrik Simon Cornelis

  19. The numerical solution of the elastohydrodynamically lubricated line- and point contact problem, using multigrid techniques

    Lubrecht, A.A.

  20. Friction in mixed and elastohydrodynamic lubricated contacts including thermal effects

    Liu, Qiang

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