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University of Twente Publications (58.244 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 26.714

  1. Electronegativity-dependent tin etching from thin films

    Pachecka, M.; Sturm, J.M.; Kruijs, R.W.E. van de; Lee, C.J.; Bijkerk, F.
    The influence of a thin film substrate material on the etching of a thin layer of deposited tin (Sn) by hydrogen radicals was studied. The amount of remaining Sn was quantified for materials that cover a range of electronegativities. We show that, for metals, etching depends on the relative electronegativity of the surface material and Sn. Tin is chemically etched from surfaces with an electronegativity smaller than Sn, while incomplete Sn etching is observed for materials with an electronegativity larger than Sn. Furthermore, the amount of remaining Sn increases as the electronegativity of the surface material increases. We speculate, that,...

  2. The Survey on Cellular and Engineered Tissue Therapies in Europe in 2013

    Martin, I.; Ireland, H.; Baldomera, H.; Dominici, M.; Saris, D.B.F.; Passweg, J.

  3. Early evolving joint degeneration by cartilage trauma is primarily mechanically controlled

    Wiegant, K.; Beekhuizen, M.; Mastbergen, S.C.; Kuchuk, N.O.; Barten-Van Rijbroek, A.D.; Custers, R.J.; Saris, D.B.F.; Creemers, L.B.; Lafeber, F.P.

  4. Early health economic modelling of single-stage cartilage repair. Guiding implementation of technologies in regenerative medicine.

    Windt, T.S. de; Sorel, J.C.; Vonk, L.A.; IJzerman, M.J.; Saris, D.B.F.

  5. Articular cartilage generation applying PEG-LA-DM/PEGDM copolymer hydrogels

    Zhao, X.; Papadopoulos, A..; Ibusuki, S.; Bichara, D.A.; Saris, D.B.F.; Malda, J.; Anseth, K.S.; Gill, T.J.; Randolph, M.A.

  6. Consumptive water footprint and virtual water trade scenarios for China - with a focus on crop production, consumption and trade

    Zhuo, L.; Mekonnen, M.M.; Hoekstra, A.Y.
    The study assesses green and blue water footprints (WFs) and virtual water (VW) trade in China under alternative scenarios for 2030 and 2050, with a focus on crop production, consumption and trade. We consider five driving factors of change: climate, harvested crop area, technology, diet, and population. Four scenarios (S1–S4) are constructed by making use of three of IPCC's shared socio-economic pathways (SSP1–SSP3) and two of IPCC's representative concentration pathways (RCP 2.6 and RCP 8.5) and taking 2005 as the baseline year. Results show that, across the four scenarios and for most crops, the green and blue WFs per tonne...

  7. Imported water risk: the case of the UK

    Hoekstra, A.Y.; Mekonnen, M.M.
    While the water dependency of water-scarce nations is well understood, this is not the case for countries in temperate and humid climates, even though various studies have shown that many of such countries strongly rely on the import of water-intensive commodities from elsewhere. In this study we introduce a method to evaluate the sustainability and efficiency of the external water footprint (WF) of a country, with the UK as an example. We trace, quantify and map the UK's direct and indirect water needs and assess the 'imported water risk' by evaluating the sustainability of the water consumption in the source...

  8. The effect of inter-annual variability of consumption, production, trade and climate on crop-related green and blue water footprints and inter-regional virtual water trade: A study for China (1978e2008)

    Zhuo, L.; Mekonnen, M.M.; Hoekstra, A.Y.
    Previous studies into the relation between human consumption and indirect water resources use have unveiled the remote connections in virtual water (VW) trade networks, which show how communities externalize their water footprint (WF) to places far beyond their own region, but little has been done to understand variability in time. This study quantifies the effect of inter-annual variability of consumption, production, trade and climate on WF and VW trade, using China over the period 1978–2008 as a case study. Evapotranspiration, crop yields and green and blue WFs of crops are estimated at a 5 × 5 arc-minute resolution for 22...

  9. Towards practitioner-initiated interactive knowledge development fot sustainable development: A cross-case analysis of three coastal projects

    Seijger, C.J.L.; Dewulf, G.P.M.R.; Tatenhove, J. van; Otter, H.S.
    Although the central challenges of sustainable development are well-known, sustainability science has been slow in contributing to effective and feasible solutions for sustainable development. Turning knowledge into action for sustainable development therefore remains a major challenge for sustainability science. Interactive knowledge development is considered a prerequisite for sustainability-oriented action. Most studies approach interactive knowledge development from a researcher's perspective. This paper focuses on practitioners that initiate interactive knowledge development for sustainability-oriented actions. A cross-case analysis is presented for interactive knowledge development in coastal projects. Three cases are analysed through the framework of project arrangements and knowledge arrangements. The projects are...

  10. Water footprints and sustainable water allocation

    Hoekstra, A.Y.; Chapagain, A.K.; Zhang, G.P.
    Water Footprint Assessment (WFA) is a quickly growing research field. This Special Issue contains a selection of papers advancing the field or showing innovative applications. The first seven papers are geographic WFA studies, from an urban to a continental scale; the next five papers have a global scope; the final five papers focus on water sustainability from the business point of view. The collection of papers shows that the historical picture of a town relying on its hinterland for its supply of water and food is no longer true: the water footprint of urban consumers is global. It has become...

  11. Inter- and intra-annual variation of water footprint of crops and blue water scarcity in the Yellow River basin (1961-2009)

    Zhuo, L.; Mekonnen, M.M.; Hoekstra, A.Y.; Wada, Y.
    The Yellow River Basin (YRB), the second largest river basin of China, has experienced a booming agriculture over the past decades. But data on variability of and trends in water consumption, pollution and scarcity in the YRB are lacking. We estimate, for the first time, the inter- and intra-annual water footprint (WF) of crop production in the YRB for the period 1961–2009 and the variation of monthly scarcity of blue water (ground and surface water) for 1978–2009, by comparing the blue WF of agriculture, industry and households in the basin to the maximum sustainable level. Results show that the average...

  12. Transient scenarios for robust climate change adaptation illustrated for water manegement in the Netherlands

    Haasnoot, M.; Schellekens, J.; Beersma, J.; Middelkoop, H.; Kwadijk, J.C.J.
    Climate scenarios are used to explore impacts of possible future climates and to assess the robustness of adaptation actions across a range of futures. Time-dependent climate scenarios are commonly used in mitigation studies. However, despite the dynamic nature of adaptation, most scenarios for local or regional decision making on climate adaptation are static 'endpoint' projections. This paper describes the development and use of transient (time-dependent) scenarios by means of a case on water management in the Netherlands. Relevant boundary conditions (sea level, precipitation and evaporation) were constructed by generating an ensemble of synthetic time-series with a rainfall generator and a...

  13. Turbulent combustion modelling of a confined premixed jet flame including heat loss effects using tabulated chemistry

    Gövert, S.; Mira, D.; Kok, J.B.W.; Vázquez, M.; Houzeaux, G.
    The present work addresses the coupling of a flamelet database, to a low-Mach approximation of the Navier–Stokes equations using scalar controlling variables. The model is characterized by the chemistry tabulation based on laminar premixed flamelets in combination with an optimal choice of the reaction progress variable, which is determined based on the computational singular perturbation (CSP) method. The formulation of the model focuses on turbulent premixed flames taking into account the effect of heat losses, but it is easily extended to partially premixed and non-premixed regimes. The model is designed for applications in both, Reynolds-averaged Navier–Stokes (RANS) as well as...

  14. Zandsuppletie Oesterdam. De ontwikkeling van een zandplaat in de Oosterschelde

    Pezij, M.; Werf, J.J. van der; Vet, L. de; Hulscher, S.J.M.H.

  15. Turbulent Combustion Modelling of a Confined Premixed Methane/Air Jet Flame Using Tabulated Chemistry

    Gövert, S.; Mira, D.; Kok, J.B.W.; Vázquez, M.; Houzeaux, G.
    The present work addresses the coupling of a flamelet database that can accurately represent the flame structure in composition space with a low-Mach approximation of the Navier-Stokes equations. An advancement of the CFI combustion model, which is currently based on laminar premixed flamelets, is used for chemistry tabulation. This model can be applied to different combustion regimes from premixed to non-premixed combustion, although this work is concentrated on turbulent premixed flames for Reynolds-averaged Navier-Stokes (RANS) and large-eddy simulations (LES). A premixed confined jet flame, which has been investigated experimentally at the German Aerospace Center (DLR) is used for validation in...

  16. Toepassing van value management (vm) in een gemeentelijke organisatie: lessons learned

    Asdonk, D. van der; Graaf, R.S. de; Stralen, L. van; Antoine, E.
    Slowly the Dutch municipalities are discovering Value Management (VM), the municipality of Amsterdam is one of them. This article describes a master thesis research in which three VM projects of Amsterdam were studied. The first two projects were used to identify bottlenecks in the applied VM method and to develop solutions to mitigate these bottlenecks. These solutions were implemented in the third project of study that showed a significant improvement in the performance. This article describes the approach of the study, the investigated projects and the results.

  17. Towards clinical application of biomechanical tools for the prediction of fracture risk in metastatic bone disease

    Derikx, L.C.; Verdonschot, N.J.J.; Tanck, E.
    Current clinical practice lacks an accurate predictor for the pathological fracture risk in metastatic bone disease, but biomechanical tools are under development to improve these predictions. In this paper we explain the limitations of currently used clinical guidelines and provide an overview of more objective and quantitative approaches that have been proposed for fracture risk assessment in metastatic bone disease. Currently, such mechanical models are as sensitive and specific as clinical guidelines, but there are a number of opportunities to further improve their predictive capacity. Hence, they are a promising tool to decrease the numbers of over- and undertreated patients.

  18. TLEM 2.0 - A comprehensive musculoskeletal geometry dataset for subject-specific modeling of lower extremity

    Carbone, V.; Fluit, R.; Pellikaan, P.; Krogt, M.M. van der; Janssen, D.; Damsgaard, M.; Vigneron, L.; Feilkas, T.; Koopman, H.F.J.M.; Verdonschot, N.J.J.
    When analyzing complex biomechanical problems such as predicting the effects of orthopedic surgery, subject-specific musculoskeletal models are essential to achieve reliable predictions. The aim of this paper is to present the Twente Lower Extremity Model 2.0, a new comprehensive dataset of the musculoskeletal geometry of the lower extremity, which is based on medical imaging data and dissection performed on the right lower extremity of a fresh male cadaver. Bone, muscle and subcutaneous fat (including skin) volumes were segmented from computed tomography and magnetic resonance images scans. Inertial parameters were estimated from the image-based segmented volumes. A complete cadaver dissection was...

  19. Water footprint assessment to inform water management and policy making in South Africa

    Pahlow, M.; Snowball, J.; Fraser, G.

  20. Tide-scale flow routing and sedimentation in mangrove forests: combining field data and numerical modelling, doi: 10.1016/j.geomorph.2014.08.011

    Horstman, E.M.; Dohmen-Janssen, C.M.; Bouma, T.J.; Hulscher, S.J.M.H.
    Tidal-scale biophysical interactions establish particular flow routing and sedimentation patterns in coastal mangroves. Sluggish water flows through the mangrove vegetation and enhanced sediment deposition are essential to maintain these valuable ecosystems, thereby enabling their contribution to coastal protection and stabilization. Spatially explicit field observations of tidal-scale flow routing and sediment deposition were obtained in an elevated mangrove stand dissected by tidal creeks, located in the Trang river estuary at the Thai Andaman coast. An accurate and efficient depth-averaged process-based numerical model of this field site was developed in Delft3D to study the contributions of various biogeophysical mangrove settings to the...

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