Searched for: subject:"grading"
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Li, Y. (author)
For the treatment of large bony defects, no perfect solution has been yet found, partially due to the unavailability of ideal bone implants. Additively manufactured (AM) biodegradable porous metals provide unprecedented opportunities to fulfil the requirements for ideal bone implants to be used in such treatments. Firstly, the multi-scale...
doctoral thesis 2020
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Rezaei, N. (author), Procel Moya, P.A. (author), Simor, Marcel (author), Vroon, Zeger (author), Zeman, M. (author), Isabella, O. (author)
An interdigitated back-contacted (IBC) configuration is proposed for submicron copper indium gallium (di)selenide (CIGS). In a modelling platform, the structure was opto-electrically optimized for maximum efficiency. The results are compared with a reference front/back-contacted (FBC) solar cell with similar absorber thickness and exhibiting...
journal article 2020
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Mirzaali Mazandarani, M. (author), Herranz de la Nava, A. (author), Gunashekar, D. (author), Nouri Goushki, M. (author), Veeger, R. P.E. (author), Grossman, Q. (author), Angeloni, L. (author), Ghatkesar, M.K. (author), Fratila-Apachitei, E.L. (author), Ruffoni, D. (author), Doubrovski, E.L. (author), Zadpoor, A.A. (author)
Functional gradients are material transitions that are found in nature and are known to result in materials with superior properties and multiple functionalities. The emerging multi-material 3D printing (=additive manufacturing, AM) techniques provide a powerful tool for the design and fabrication of bioinspired functionally graded materials ...
journal article 2020
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Rais, Andreas (author), Poschenrieder, Werner (author), van de Kuilen, J.W.G. (author), Pretzsch, Hans (author)
Controlling the long-term effect of management on the quantity and properties of individual boards is a fundamental challenge for silviculture. Within this basic study on Douglas-fir, we have investigated the sensitivity of the net present value (NPV) to three most common planting densities and a prominent pruning strategy. We therefore have...
journal article 2020
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Mirzaali Mazandarani, M. (author), Herranz de la Nava, Alba (author), Gunashekar, Deepthishre (author), Nouri Goushki, M. (author), Doubrovski, E.L. (author), Zadpoor, A.A. (author)
The functional gradient is a concept often occurring in nature. This concept can be implemented in the design and fabrication of advanced materials with specific functionalities and properties. Functionally graded materials (FGMs) can effectively eliminate the interface problems in extremely hard–soft connections, and, thus, have numerous and...
journal article 2019
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Messaadi, M. (author), Oomen, Matthijs (author), Kumar, A. (author)
Bainitic steels are gaining popularity for application in the railway switches and crossing, thanks to their better rolling contact fatigue (RCF) and wear resistance. The rail degradation caused by RCF and wear could be also reduced by the use of friction modifiers (FM) through their ability to reduce the lateral load during wheel passage....
journal article 2019
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Kuipers, T. (author), Wu, J. (author), Wang, C.C. (author)
The fabrication flexibility of 3D printing has sparked a lot of interest in designing structures with spatially graded material properties. In this paper, we propose a new type of density graded structure that is particularly designed for 3D printing systems based on filament extrusion. In order to ensure high-quality fabrication results,...
journal article 2019
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Schlotzhauer, Philipp (author), Kovryga, Andriy (author), Emmerich, Lukas (author), Bollmus, Susanne (author), van de Kuilen, J.W.G. (author), Militz, Holger (author)
Background and Objectives: In the near future, in Europe a raised availability of hardwoods is expected. One possible sales market is the building sector, where medium dense European hardwoods could be used as load bearing elements. For the hardwood species beech, oak, and sweet chestnut technical building approvals already allow the production...
journal article 2019
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Zhang, H. (author), Anupam, K. (author), Scarpas, Athanasios (author), Kasbergen, C. (author), Erkens, S. (author)
Within the pavement engineering community, porous asphalt (PA) mixes are regarded as mixes capable of reducing noise and improving wet skid resistance. However, these mixes are likely to have the distress of ravelling. In order to analyse the propensity of a given PA mix for ravelling, the homogenisation technique can be considered as an...
journal article 2019
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Gao, P. (author), Zhang, Tong Sheng (author), Wei, Jiang Xiong (author), Yu, Qi Jun (author)
Graded blended cement made of graded Portland cement (PC), blast furnace slag (BFS) and fly ash (FA) is attractive for cement production. For manufacturing graded blended cement, a suitable mathematical expression should be introduced to describe the particle size distribution (PSD) of its components and control the quality of graded blended...
journal article 2018
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Hiensch, E.J.M. (author), Steenbergen, M.J.M.M. (author)
The concept of the rail damage function provides vital understanding of the operational performance of rail grades in terms of surface degradation. The present study extends this concept from conventional to premium pearlitic rail. This is done on the basis of both simulations of dynamic train-track interaction and field observations. Rolling...
journal article 2018
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Wambeke, T. (author), Elder, D. (author), Miller, A. (author), Benndorf, J. (author), Peattie, R. (author)
The ball mill is usually the largest energy consumer at a mine site and significantly affects operational expenditures. Given a target particle size, Bond Mill Work Index estimates are used to predict a ball mill’s throughput. In order to maximize ball mill throughput and optimize energy utilization, it is important to get these estimates right....
journal article 2018
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Peelman, S. (author), Kooijman, D. (author), Sietsma, J. (author), Yang, Y. (author)
The present study proposes three distinct processes to recycle rare earth elements (REE) from two low-grade secondary resources: REE-containing mine tailings and ferrous scrap from shredded waste of electrical and electronic equipment (WEEE). The first developed process extracts both REE and phosphorus from the apatite mineral contained within...
journal article 2018
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Wambeke, T. (author), Benndorf, J. (author)
The mining industry continuously struggles to keep produced tonnages and grades aligned with targets derived from model-based expectations. Deviations often result from the inability to characterise short-term production units accurately based on sparsely distributed exploration data. During operation, the characterisation of short-term...
journal article 2018
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Westermayr, Maximilian (author), Stapel, Peter (author), van de Kuilen, J.W.G. (author)
This paper investigates the tensile strength and stiffness of low quality beech sawn timber. In addition, the influences of visual and physical characteristics of the beech boards on the mechanical performance were analysed. Visual characteristics like knots, pith or fibre deviation as well as density and dynamic modulus of elasticity were...
conference paper 2018
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Sarnaghi, Ani Khaloian (author), van de Kuilen, J.W.G. (author)
Structural heterogeneities in wood are changing the complexity of the numerical modelling of this material. Knots are the main strength governing parameters, which are changing the uniformity of the stress distributions through the boards. These weak locations may result in failure in the material. Comprehensive reconstruction of the boards,...
conference paper 2018
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Zhang, Xiang Yu (author), Fang, Gang (author), Xing, Lei Lei (author), Liu, Wei (author), Zhou, J. (author)
Functionally graded scaffold (FGS) is designed to mimic the morphology, mechanical and biological properties of natural bone closely. Porosity variation strategy between different regions in FGS plays a crucial role in influencing its mechanical and biological performance. A combination of modeling tool and scripting language can effectively...
journal article 2018
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Winkler, P. (author), Salehi Sadaghiani, M.R. (author)
conference paper 2017
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Correia dos Santos, R. (author), Caldeira, L. (author), Maranha das Neves, E, (author)
A laboratory study aiming at the evaluation of the suffusion behaviour of coarse gap-graded soils is presented. Six granular gap-graded soils missing the medium-to-coarse sand fraction have been examined. Four soils have no fines, one has 5% of non-plastic fines, and one has 5% of clayey fines (with plasticity index of about 14%). The use of...
conference paper 2017
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Li, S. (author), Russell, A.R. (author), Muir Wood, D. (author)
Results of an experimental investigation are reported, conducted to study the stress-strain behavior of a soil having undergone different amounts of internal erosion. The soil used is gap-graded and cohesionless comprising silt, sand and gravel. Internal erosion tests and subsequent triaxial tests are performed in a specially designed apparatus...
conference paper 2017
Searched for: subject:"grading"
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