Searched for: subject:"topology"
(1 - 20 of 112)

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de Vos, P. (author)
This research aims to help in solving problems experienced with system integration in early-stage ship and system design by enabling automated design space exploration for on-board energy distribution systems. An Automatic Topology Generation (ATG) tool is developed and tested to do so. The ATG tool supports system designers in making trade-off...
doctoral thesis 2018
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Gupta, D.K. (author), Langelaar, M. (author), van Keulen, A. (author)
Recent multiresolution topology optimization (MTO) approaches involve dividing finite elements into several density cells (voxels), thereby allowing a finer design description compared to a traditional FE-mesh-based design field. However, such formulations can generate discontinuous intra-element material distributions resembling QR-patterns....
journal article 2018
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Agarwal, Girish (author), Allen, Roland E. (author), Bezděková, Iva (author), Boyd, Robert W. (author), Chen, Goong (author), Hanson, R. (author), Hawthorne, Dean L. (author), Hemmer, Philip (author), Kim, Moochan B. (author), Kocharovskaya, Olga (author), Lee, D. (author), Lidström, Sebastian K. (author), Lidström, Suzy (author), Losert, Harald (author), Maier, Helmut (author), Neuberger, John W. (author), Padgett, Miles J. (author), Raizen, Mark (author), Rajendran, Surjeet (author), Rasel, Ernst (author), Schleich, Wolfgang P. (author), Scully, Marlan O. (author), Shchedrin, Gavriil (author), Shvets, Gennady (author), Sokolov, Alexei P. (author), Svidzinsky, Anatoly (author), Walsworth, Ronald L. (author), Weiss, Rainer (author), Wilczek, Frank (author), Willner, Alan E. (author), Yablonovich, Eli (author), Zheludev, Nikolay (author)
The Winter Colloquium on the Physics of Quantum Electronics (PQE) has been a seminal force in quantum optics and related areas since 1971. It is rather mind-boggling to recognize how the concepts presented at these conferences have transformed scientific understanding and human society. In January 2017, the participants of PQE were asked to...
journal article 2018
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Evans, Michael (author), Angeli, David (author), Tindemans, S.H. (author)
We consider the problem of dispatching a fleet of distributed energy reserve devices to collectively meet a sequence of power requests over time. Under the restriction that reserves cannot be replenished, we aim to maximise the survival time of an energy-constrained islanded electrical system; and we discuss realistic scenarios in which this...
conference paper 2018
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De Angelis, L. (author), Kuipers, L. (author)
Vortices, phase singularities, and topological defects of any kind often reflect information that is crucial for understanding physical systems in which such entities arise. With near-field experiments supported by numerical calculations, we determine the fluctuations of the topological charge for phase singularities in isotropic random waves as...
journal article 2018
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Skolasinski, R.J. (author)
Topological insulators and topological superconductors are novel states of matter.
One of the most characteristic properties of topological insulators are the topologically protected edge states.
While the bulk of the material stays insulating, the edge-state conductance is quantized and topologically protected from backscattering.
doctoral thesis 2018
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Vitalis, Dimitrios (author), Veer, F.A. (author), Oikonomopoulou, F. (author)
This paper describes the engineering steps taken in order to investigate the potential of glass sandwich elements, made of 2 glass skins separated by a glass core in the form of spacers, as a way to create planar elements with a high stiffness to weight ratio, reducing material consumption in structural glazing applications. The aim is to...
conference paper 2018
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Goudar, M.V. (author), Elsinga, G.E. (author)
The motion of tracer particles is kinematically simulated around three elementary flow patterns; a Burgers vortex, a shear-layer structure with coincident vortices and a node-saddle topology. These patterns are representative for their broader class of coherent structures in turbulence. Therefore, examining the dispersion in these elementary...
journal article 2018
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Langelaar, M. (author)
Purpose: The purpose of this paper is to communicate a method to perform simultaneous topology optimization of component and support structures considering typical metal additive manufacturing (AM) restrictions and post-print machining requirements. Design/methodology/approach: An integrated topology optimization is proposed using two density...
journal article 2018
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Langelaar, M. (author)
Additive manufacturing (AM) enables the fabrication of parts of unprecedented complexity. Dedicated topology optimization approaches, that account for specific AM restrictions, are instrumental in fully exploiting this capability. In popular powder-bed-based AM processes, the critical overhang angle of downward facing surfaces limits...
journal article 2018
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Liu, Jikai (author), Gaynor, Andrew T. (author), Chen, Shikui (author), Kang, Zhan (author), Suresh, Krishnan (author), Takezawa, Akihiro (author), Li, Lei (author), Kato, Junji (author), Tang, Jinyuan (author), Wang, C.C. (author), Cheng, Lin (author), Liang, Xuan (author), To, Albert. C. (author)
Manufacturing-oriented topology optimization has been extensively studied the past two decades, in particular for the conventional manufacturing methods, for example, machining and injection molding or casting. Both design and manufacturing engineers have benefited from these efforts because of the close-to-optimal and friendly-to-manufacture...
journal article 2018
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Koppen, S. (author), van der Kolk, M. (author), van Kempen, F.C.M. (author), de Vreugd, J (author), Langelaar, M. (author)
The stringent and conflicting requirements imposed on optomechanical instruments and the ever-increasing need for higher resolution and quality imagery demands a tightly integrated system design approach. Our aim is to drive the thermomechanical design of multiple components through the optical performance of the complete system. To this end,...
journal article 2018
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Vitalis, S. (author), Arroyo Ohori, G.A.K. (author), Stoter, J.E. (author)
3D city models are becoming increasingly important for applications such as evacuation scenarios and energy consumption estimation. For these applications embedding semantic information on geometry is a key factor. The most popular implementation of modern 3D city models is based on the CityGML data model which describes spatial 3D data using a...
conference paper 2018
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çetinay-iyicil, H. (author), Kuipers, F.A. (author), Van Mieghem, P.F.A. (author)
This paper combines the fundamentals of an electrical grid, such as flow allocation according to Kirchhoff’s laws and the effect of transmission line reactances with spectral graph theory, and expresses the linearized power flow behaviour in slack-bus independent weighted graph matrices to assess the relation between the topological structure...
journal article 2018
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Wang, Weiming (author), Liu, Yong-Jin (author), Wu, J. (author), Tian, Shengjing (author), Wang, C.C. (author), Liu, Ligang (author), Liu, Xiuping (author)
Offsetting-based hollowing is a solid modeling operation widely used in 3D printing, which can change the model's physical properties and reduce the weight by generating voids inside a model. However, a hollowing operation can lead to additional supporting structures for fabrication in interior voids, which cannot be removed. As a consequence...
journal article 2018
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van de Ven, E.A. (author), Maas, Robert (author), Ayas, C. (author), Langelaar, M. (author), van Keulen, A. (author)
Additive manufacturing enables the nearly uncompromised production of optimized topologies. However, due to the overhang limitation, some designs require a large number of supporting structures to enable manufacturing. Because these supports are costly to build and difficult to remove, it is desirable to find alternative designs that do not...
journal article 2018
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Gupta, D.K. (author), Barink, Marco (author), Langelaar, M. (author)
Concentrated photovoltaics (CPV) has recently gained popularity due to its ability to deliver significantly more power at relatively lower absorber material costs. In CPVs, lenses and mirrors are used to concentrate illumination over a small solar cell, thereby increasing the incident light by several folds. This leads to non-uniform...
journal article 2018
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Pan, K. (author), Teixeira, Andre M. H. (author), Cvetkovic, M. (author), Palensky, P. (author)
Understanding smart grid cyber attacks is key for developing appropriate protection and recovery measures. Advanced attacks pursue maximized impact at minimized costs and detectability. This paper conducts risk analysis of combined data integrity and availability attacks against the power system state estimation. We compare the combined...
journal article 2018
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Koutrouvelis, A. (author), Sherson, T.W. (author), Heusdens, R. (author), Hendriks, R.C. (author)
We propose a new robust distributed linearly constrained beamformer which utilizes a set of linear equality constraints to reduce the cross power spectral density matrix to a block-diagonal form. The proposed beamformer has a convenient objective function for use in arbitrary distributed network topologies while having identical performance...
journal article 2018
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de Angelis, L. (author), Alpeggiani, F. (author), Di Falco, Andrea (author), Kuipers, L. (author)
Phase singularities are locations where light is twisted like a corkscrew, with positive or negative topological charge depending on the twisting direction. Among the multitude of singularities arising in random wave fields, some can be found at the same location, but only when they exhibit opposite topological charge, which results in their...
journal article 2017
Searched for: subject:"topology"
(1 - 20 of 112)

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