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Draws, T.A. (author), Liu, Jody (author), Tintarev, N. (author)Support or opposition concerning a debated claim such as abortion should be legal can have different underlying reasons, which we call perspectives. This paper explores how opinion mining can be enhanced with joint topic modeling, to identify distinct perspectives within the topic, providing an informative overview from unstructured text. We...conference paper 2021
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Ma, Bingtao (author), Liu, Hongsen (author), Nan, L. (author), Tang, Xu (author), Fan, Huijie (author), Cong, Yang (author)The 3D mesh is an important representation of geometric data. It is widely used in computer graphics and has attracted more attention in computer vision community recently. However, in the generation of mesh data, geometric deficiencies (e.g., duplicate elements, degenerate faces, isolated vertices, self-intersection, and inner faces) are...conference paper 2021
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Liu, Y. (author), Pamososuryo, A.K. (author), Ferrari, Riccardo M.G. (author), Hovgaard, Tobias Gybel (author), van Wingerden, J.W. (author)Modern wind turbine control algorithms typically utilize rotor effective wind speed measured from an anemometer on the turbine’s nacelle. Unfortunately, the measured wind speed from such a single measurement point does not give a good representation of the effective wind speed over the blades, as it does not take the varying wind condition...conference paper 2021
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Arcondoulis, Elias J. G. (author), Liu, Yu (author), Yang, Yannian (author), Ragni, D. (author), Rubio Carpio, A. (author), Avallone, F. (author)View Video Presentation: https://doi-org.tudelft.idm.oclc.org/10.2514/6.2021-2226.vid<br/><br/>The mechanisms responsible for vortex shedding reduction, due to the application of a porous coating to a smooth cylinder placed in uniform flow, are still uncertain despite several numerical and experimental studies. To help understand these...conference paper 2021
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Ren, S. (author), Liu, X. (author), Lin, P. (author), Erkens, S. (author)This study elaborates the influence of blends formulated by waste oil (WO) and styrene-butadiene rubber (SBR) on thermo-mechanical and chemical compositional characteristics of rejuvenated bitumen. The results show that both WEO (waste engine oil) and WCO (waste cooking oil) can compensate viscous component for reclaimed bitumen, and the effect...conference paper 2021
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Liu, Y. (author), Semertzis, I. (author), Stefanov, Alexandru (author), Palensky, P. (author)The security issues of Cyber-Physical power Systems (CPS) have attracted widespread attention from scholars. Vulnerability assessment emerges as an effective method to identify the critical components and thus increase the system resilience. While efforts have been made to study the vulnerability features of power systems under the occurrence...conference paper 2021
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Zhang, Y. (author), Liu, X. (author), Ren, S. (author), Jing, R. (author), Gard, W.F. (author), Apostolidis, P. (author), Erkens, S. (author), Scarpas, Athanasios (author)Lignin, one of the most abundant natural polymers, has been extensively studied as liquid or solid additive in bituminous binders. Despite the fact the organosolv lignin in bitumen improves the overall resistance against oxidative aging, lignin could lead to binders of high thermal cracking sensitivity. In this study, a bio-based oil is...conference paper 2021
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Liu, Hexin (author), Perera, Leibny Paola Garcia (author), Zhang, Xinyi (author), Dauwels, J.H.G. (author), Khong, Andy W.H. (author), Khudanpur, Sanjeev (author), Styles, Suzy J. (author)We propose two end-to-end neural configurations for language diarization on bilingual code-switching speech. The first, a BLSTM-E2E architecture, includes a set of stacked bidirectional LSTMs to compute embeddings and incorporates the deep clustering loss to enforce grouping of languages belonging to the same class. The second, an XSA-E2E...conference paper 2021
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Liu, Y. (author), Ferrari, Riccardo M.G. (author), van Wingerden, J.W. (author)Individual Pitch Control (IPC) is an effective control strategy to mitigate the blade loads on large-scale wind turbines. Since IPC usually requires high pitch actuation, the safety constraints of the pitch actuator should be taken into account when designing the controller. This paper introduces a constrained Subspace Predictive Repetitive...conference paper 2021
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Liu, Hao (author), Ye, Hanting (author), Yang, J. (author), Wang, Q. (author)Motivated by the trend of realizing full screens on devices such as smartphones, in this work we propose through-screen sensing with visible light for the application of fingertip air-writing. The system can recognize handwritten digits with under-screen photodiodes as the receiver. The key idea is to recognize the weak light reflected by the...conference paper 2021
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Hong, H. (author), Ye, Li (author), Li, Ke (author), Sarro, Pasqualina M (author), Zhang, Kouchi (author), Liu, Zewen (author)In this paper, we report a modified three step anisotropic wet etching (TSWE) method to fabricate solid-state silicon nanoslits. The slit-opening process is performed by <111> crystal plane etching. The etching rate of the <111> crystal plane is reasonably slow as it is only 1/45 of the <100> etching rate, thus allowing and...conference paper 2021
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Boot, T. (author), Riemslag, A.C. (author), Reinton, T.E. (author), Liu, Ping (author), Walters, C.L. (author), Popovich, V. (author)With fossil fuels being phased out and growing global interest in a hydrogen economy, there is demand for re-purposing existing pipelines for transportation of hydrogen gas. However, hydrogen embrittlement (HE) can limit pipeline steel’s performance. In this study, the effect of hydrogen on the mechanical properties of an X60 base metal ...conference paper 2021
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Brühl, M. (author), Wahls, S. (author), Barranco Granged, Ignacio (author), Liu, Philipp L.-F. (author)Bores propagating in shallow water transform into undular bores and, finally, into trains of solitons. The observed number and height of these undulations, and later discrete solitons, is strongly dependent on the propagation length of the bore. Empirical results show that the final height of the leading soliton in the far-field is twice the...conference paper 2020
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Wang, H. (author), Apostolidis, P. (author), Zhang, H. (author), Liu, X. (author), Erkens, S. (author), Scarpas, Athanasios (author)Microwave heating is a promising heating technology for the maintenance, recycling and deicing of pavement structures. Many experimental studies have been conducted to investigate the microwave heating properties of asphalt mixtures in the laboratory. However, very few studies investigated the application of microwave heating on asphalt...conference paper 2020
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Apostolidis, P. (author), Wang, H. (author), Zhang, H. (author), Liu, X. (author), Erkens, S. (author), Scarpas, Athanasios (author)Oxidative aging is a complex phenomenon in bitumen and its fundamental understanding is needed to optimize paving materials with long-lasting characteristics. This research reports on a diffuse-reaction model for predicting the oxidation of bituminous binders over time and under different conditions. As known, the oxidation of bitumen is...conference paper 2020
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Apostolidis, P. (author), Liu, X. (author), Erkens, S. (author), Scarpas, Athanasios (author)In-depth understanding of the temperature effect on oxidative aging in epoxy-asphalt blends is needed to enable accurate predictions on material response through their service life. Details of the significance of developing prediction models and tools on oxidative aging of pavement materials are presented in a companion paper (Apostolidis et al....conference paper 2020
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Zhang, Y. (author), Liu, X. (author), Jing, R. (author), Apostolidis, P. (author), Erkens, S. (author), Scarpas, Athanasios (author)During oxidative aging, oxygen reacts with active molecules present in bitumen producing polar compounds, principally ketones and sulfoxides, and increasing in the portion of asphaltenes. In general, oxidation reactions in bitumen yields to change its generic chemical composition and finally its colloidal structure deteriorating the physico...conference paper 2020
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Wang, H. (author), Apostolidis, P. (author), Zhang, H. (author), Liu, X. (author), Erkens, S. (author), Scarpas, Athanasios (author)Fundamental models should be developed and utilized in order to facilitate the chemo-mechanical design of modified binder systems for paving applications but not only. Especially, the fact that the incorporation of new chemical substances used as bio-based modifiers or alternative binders is attracting great interest to replace traditional...conference paper 2020
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Lehane, Barry M. (author), Liu, Zhongqiang (author), Bittar, Eduardo (author), Nadim, Farrokh (author), Lacasse, Suzanne (author), Jardine, Richard (author), Carotenuto, Pasquale (author), Rattley, Mike (author), Gavin, Kenneth (author)This paper outlines the development of a new ‘Unified’ CPT-based method for estimating the axial capacity of driven piles in sand. The method adapts key features of the four CPT-based methods currently in the API and ISO guidelines. The new method was calibrated with the Unified database of pile load tests developed as part of an earlier joint...conference paper 2020
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Yang, Fawei (author), Le Kernec, Julien (author), Fioranelli, F. (author), Liu, Quanhua (author)This paper presents a shape feature aided target detection method for micro-drone surveillance radar in order to mitigate the false alarms caused by the ground clutter. The method consists of a segmentation threshold selection method based on target measurements and a shape-feature extraction method based on Hu moments. Then the performance...conference paper 2020