Searched for: author:"Chen, Y."
(1 - 20 of 71)

Pages

document
Chen, Y. (author), Copuroglu, Oguzhan (author), Romero Rodriguez, C. (author), França de Mendonça Filho, F. (author), Schlangen, E. (author)
For many 3D printed cementitious materials, air voids may play a dominant role in the interlayer bond strength. However, to date, far too little attention has been paid to reveal the air void characteristics in 3D printed cementitious materials. Therefore, to fill this gap, this study attempts to provide an example of systematically...
journal article 2021
document
Li, Z. (author), Lu, T. (author), Chen, Y. (author), Wu, B. (author), Ye, G. (author)
This study aims to predict the autogenous shrinkage of alkali-activated concrete (AAC) based on slag and fly ash. A variety of analytical and numerical models are available for the prediction of autogenous shrinkage of ordinary Portland cement (OPC) concrete, but these models are found to show dramatic discrepancies when applied for AAC due...
journal article 2021
document
Li, Z. (author), Liang, X. (author), Chen, Y. (author), Ye, G. (author)
The high autogenous shrinkage of alkali-activated materials made from slag and fly ash is recognised as a major drawback with regard to the use as construction materials. In this study, metakaolin was introduced into the alkali-activated slag-fly ash (AASF) paste to mitigate the autogenous shrinkage. The shrinkage mitigation mechanism of...
journal article 2021
document
Chen, Y. (author)
In recent years, creating an urban legacy has gradually become the focus of event-led development or regeneration in cities. World Expo 2010 Shanghai, held under the theme “Better city, Better life” was organised to emphasise the concept of “city of harmony” and to promote the sustainable development of the city. The event itself is considered...
report 2020
document
Chen, Y. (author), Qu, L. (author)
The rapid development of Chinese megacities in the last decades have been mainly characterized by top-down planning and large-scale urban development and redevelopment, as well as by using place-making as a tool for city branding. This approach has also been used in other countries and has been constantly criticized for replacing old...
journal article 2020
document
Chen, Y. (author), Chaves Figueiredo, S. (author), Li, Z. (author), Chang, Z. (author), Jansen, K. (author), Copuroglu, Oguzhan (author), Schlangen, E. (author)
In 3D concrete printing (3DCP), it is necessary to meet contradicting rheological requirements: high fluidity during pumping and extrusion, and high stability and viscosity at rest to build the layered structure. In this paper, the impact of the hydroxypropyl methylcellulose (HPMC)-based viscosity-modifying admixture (VMA) on the 3D printability...
journal article 2020
document
Urso, A. (author), Chen, Y. (author), Staszewski, R.B. (author), Dijkhuis, Johan F. (author), Stanzione, Stefano (author), Liu, Y. (author), Serdijn, W.A. (author), Babaie, M. (author)
In this paper, we propose a new scheme to directly power a 4.9-5.6GHz LC oscillator from a recursive switched-capacitor DC-DC converter. A finite-state machine is integrated to automatically adjust the conversion ratio and switching frequency of the converter such that its DC output voltage is within ±5% of the desired 1V across input voltage...
journal article 2020
document
Zhang, Jiayun (author), Chen, Y. (author), Gong, Qingyuan (author), Ding, Aaron Yi (author), Xiao, Yu (author), Wang, Xin (author), Hui, Pan (author)
We perform an initial study on the working time of software developers in IT companies across China and the United States by investigating the timestamps of commit activities on GitHub. We identify three temporal patterns shown in commit activities among these companies. We find that Chinese companies are more likely to follow long working...
journal article 2020
document
Gan, Y. (author), Vandamme, Matthieu (author), Zhang, Hongzhi (author), Chen, Y. (author), Schlangen, E. (author), van Breugel, K. (author), Šavija, B. (author)
This study proposes an experimental method for studying the short-term creep behaviour of cement paste at micro-scale. The micro-bending tests on miniaturized cantilever beams were used to characterize the viscoelastic properties of cement paste. The effects of w/b ratio, the type of binder and the stress level on the microscopic creep...
journal article 2020
document
Chen, Y. (author), Goorden, M.C. (author), Vastenhouw, B. (author), Beekman, F.J. (author)
Brain perfusion SPECT can be used in the diagnosis of various neurologic or psychiatric disorders, e.g. stroke, epilepsy, dementia and posttraumatic stress disorder. As traditional SPECT provides limited resolution and sensitivity, we recently proposed a high resolution focusing multi-pinhole clinical SPECT scanner dubbed G-SPECT-I (Beekman...
journal article 2020
document
Chen, Y. (author), Romero Rodriguez, C. (author), Li, Z. (author), Chen, B. (author), Copuroglu, Oguzhan (author), Schlangen, E. (author)
This study aims to investigate the influences of different grades of calcined clay on 3D printability, compressive strength (7 days), and hydration of limestone and calcined clay-based cementitious materials. Calcined clays that contained various amounts of metakaolin were achieved by blending low-grade calcined clay (LGCC) and high-grade...
journal article 2020
document
Chen, Y. (author), Jansen, K. (author), Zhang, H. (author), Romero Rodriguez, C. (author), Gan, Y. (author), Copuroglu, Oguzhan (author), Schlangen, E. (author)
For a single batch material, time intervals and nozzle standoff distances between two subsequent layers are two critical printing parameters that influence the mechanical performance of the printed concrete. This paper presents an experimental and numerical study to investigate the impacts of these printing parameters on the interlayer bond...
journal article 2020
document
Wang, Wenjing (author), Wang, Y. (author), Homem de Almeida Correia, G. (author), Chen, Y. (author)
In a multimodal public transport network, transfers are inevitable. Planning and managing an efficient transfer connection is thus important and requires an understanding of the factors that influence those transfers. Existing studies on predicting passenger transfer flows have mainly used transit assignment models based on route choice,...
journal article 2020
document
Chen, Y. (author)
Legacy research has become an important part in mega-event studies. It was first raised by the International Olympic Committee (IOC) to assess the longer impact of the Olympic Games on host cities, after witnessing how a mega-event could drastically transform host cities like Barcelona, an industrial city in the midst of a deep economic crisis....
book chapter 2020
document
Li, Z. (author), Yao, X. (author), Chen, Y. (author), Lu, T. (author), Ye, G. (author)
Alkali-activated slag and fly ash (AASF) materials are emerging as promising alternatives to conventional Portland cement. Despite the superior mechanical properties of AASF materials, they are known to show large autogenous shrinkage, which hinders the wide application of these eco-friendly materials in infrastructure. To mitigate the...
journal article 2020
document
Urso, A. (author), Chen, Y. (author), Dijkhuis, Johan F. (author), Liu, Yao-Hong (author), Babaie, M. (author), Serdijn, W.A. (author)
This article presents guidelines for designing the power supply blocks of RF oscillators. To preserve their spectral purity, the requirements on the noise and ripple of the supply voltage are firstly evaluated based on the oscillator supply pushing factor and the oscillator Figure-of-Merit (FOM). Those specifications are then employed to design...
journal article 2020
document
Huang, J. (author), Talbi, Rania (author), Zhao, Z. (author), Boucchenak, Sara (author), Chen, Y. (author), Roos, S. (author)
Federated Learning is an emerging distributed collaborative learning paradigm adopted by many of today's applications, e.g., keyboard prediction and object recognition. Its core principle is to learn from large amount of users data while preserving data privacy by design as collaborative users only need to share the machine learning models...
conference paper 2020
document
Han, Rui (author), Liu, Chi Harold (author), Zong, Zan (author), Chen, Y. (author), Liu, Wending (author), Wang, Siyi (author), Zhan, Jianfeng (author)
Cluster schedulers provide flexible resource sharing mechanism for best-effort cloud jobs, which occupy a majority in modern datacenters. Properly tuning a scheduler's configurations is the key to these jobs' performance because it decides how to allocate resources among them. Today's cloud scheduling systems usually rely on cluster operators...
journal article 2019
document
Chen, Y. (author), Daamen, T.A. (author), Heurkens, E.W.T.M. (author), Verheul, W.J. (author)
To understand and deal with real urban development problems, urban planners, designers, and managers need to combine and synthesize a variety of academic and professional knowledge. As our urban challenges grow more complex, learning how to do this effectively becomes ever more important. For educators, this means teaching students how to...
journal article 2019
document
Qu, L. (author), Chen, Y. (author), Rooij, R.M. (author), de Jong, P. (author)
This article will contribute to filling the knowledge gap about learning from group methods in (urban and regional) design education, with action research results based on real teaching activities in TU Delft, Faculty of Architecture and the Built Environment (A&BE), conducted and coordinated by the authors. Constructive alignment of the...
journal article 2019
Searched for: author:"Chen, Y."
(1 - 20 of 71)

Pages