document

Performance evaluation of ventilative cooling systems for buildings under different control parameters and strategies

Hu, Yan (author), Liu, Zhengxuan (author), Ai, Zhengtao (author), Zhang, Guoqiang (author)

Ventilative cooling is an energy-saving technology to diminish thermal discomfort and overheating risk of buildings, meanwhile achieving high indoor air quality (IAQ). However, there is still no optimal control strategy in practice, which considerably limits its application. This study developed a typical office building model to evaluate the...

journal article 2023

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Integrating the flow regime and water quality effects into a niche-based metacommunity dynamics model for river ecosystems

Wang, Yibo (author), Liu, Pan (author), Solomatine, D.P. (author), Li, Liping (author), Wu, Chen (author), Han, Dongyang (author), Zhang, Xiaojing (author), Yang, Zhikai (author), Yang, Sheng (author)

Aquatic community dynamics are closely dominated by flow regime and water quality conditions, which are increasingly threatened by dam regulation, water diversion, and nutrition pollution. However, further understanding of the ecological impacts of flow regime and water quality conditions on aquatic multi-population dynamics has rarely been...

journal article 2023

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Building water quality deterioration during water supply restoration after interruption: Influences of premise plumbing configuration

Yao, Mingchen (author), Zhang, Yue (author), Dai, Zihan (author), Ren, Anran (author), Fang, Jiaxing (author), Li, Xiaoming (author), van der Meer, Walter (author), Medema, G.J. (author), Rose, Joan B. (author), Liu, Gang (author)

Premise plumbing plays an essential role in determining the final quality of drinking water consumed by customers. However, little is known about the influences of plumbing configuration on water quality changes. This study selected parallel premise plumbing in the same building with different configurations, i.e., laboratory and toilet...

journal article 2023

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Direct evidence of microbiological water quality changes on bacterial quantity and community caused by plumbing system

Li, Jun (author), Ren, Anran (author), van der Mark, Ed (author), Liu, G. (author)

Drinking water quality deteriorates from treatment plant to customer taps, especially in the plumbing system. There is no direct evidence about what the differences are contributed by plumbing system. This study compared the water quality in the water main and at customer tap by preparing a sampling tap on the water main. The biomass was...

journal article 2022

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BIM-integrated portfolio-based strategic asset data quality management

Fang, Zigeng (author), Liu, Y. (author), Lu, Qiuchen (author), Pitt, Michael (author), Hanna, Sean (author), Tian, Zhichao (author)

A building's strategic asset management (SAM) capability has traditionally been limited by its site-based management. With the emergence of needs from clients about delivering a long-term portfolio-based building asset management plan that minimizes the asset risk and optimizes the value of their asset portfolios, SAM Units have emerged as a...

journal article 2022

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An Investigation on the Current Collection Quality of Railway Pantograph-catenary Systems with Contact Wire Wear Degradations

Song, Yang (author), Wang, H. (author), Liu, Zhigang (author)

In railway pantograph-catenary systems, the contact surfaces undergo wear in long-term operations, directly affecting interaction performance and potentially deteriorating the current collection quality. The effect of contact wire wear (CWW) on the current collection quality should be evaluated to understand the system's health status in...

journal article 2021

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Changes in biofilm composition and microbial water quality in drinking water distribution systems by temperature increase induced through thermal energy recovery

Ahmad, J.I. (author), Dignum, Marco (author), Liu, G. (author), Medema, G.J. (author), van der Hoek, J.P. (author)

Drinking water distribution systems (DWDSs) have been thoroughly studied, but the concept of thermal energy recovery from DWDSs is very new and has been conceptualized in the past few years. Cold recovery results in a temperature increase of the drinking water. Its effects on drinking water quality and biofilm development are unclear. Hence, we...

journal article 2021

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Effects of cold recovery technology on the microbial drinking water quality in unchlorinated distribution systems

Ahmad, J.I. (author), Liu, G. (author), van der Wielen, Paul (author), Medema, G.J. (author), van der Hoek, J.P. (author)

Drinking water distribution systems (DWDSs) are used to supply hygienically safe and biologically stable water for human consumption. The potential of thermal energy recovery from drinking water has been explored recently to provide cooling for buildings. Yet, the effects of increased water temperature induced by this “cold recovery” on the...

journal article 2020

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Assessing the transition effects in a drinking water distribution system caused by changing supply water quality: an indirect approach by characterizing suspended solids

Chen, L. (author), Ling, Fangqiong (author), Bakker, Geo (author), Liu, Wen Tso (author), Medema, G.J. (author), van der Meer, W.G.J. (author), Liu, G. (author)

Worldwide, it is common that the drinking water distribution systems (DWDSs) may be subjected to changes of supply water quality due to the needs of upgrading the treatment processes or switching the source water. However, the potential impacts of quality changed supply water on the stabilized ecological niches within DWDSs and the associated...

journal article 2020

document

Energy recovery from the water cycle: Thermal energy from drinking water

van der Hoek, J.P. (author), Mol, Stefan (author), Giorgi, Sara (author), Ahmad, J.I. (author), Liu, G. (author), Medema, G.J. (author)

Greenhouse gas (GHG) emissions contribute to climate change. The public water utility of Amsterdam wants to operate climate neutrally in 2020 to reduce its GHG emissions. Energy recovery from the water cycle has a large potential to contribute to this goal: the recovered energy is an alternative for fossil fuel and thus contributes to the...

journal article 2018

document

Research on local deformation property of asphalt mixture using digital image correlation

Xing, C. (author), Tan, Yiqiu (author), Liu, X. (author), Anupam, K. (author), Scarpas, Athanasios (author)

Failure behavior of asphalt mixture is the process of local deformation accumulation, therefore, local deformation investigation is the base work of failure behavior. Digital image correlation (DIC) method is an optical method which can calculate the local deformation in the failure process. This paper aims to evaluate the precision, select...

journal article 2017

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Thermal Energy Recovery from Drinking Water

van der Hoek, J.P. (author), Mol, S (author), Ahmad, J.I. (author), Liu, G. (author), Medema, G.J. (author)

conference paper 2017

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Hotspots for selected metal elements and microbes accumulation and the corresponding water quality deterioration potential in an unchlorinated drinking water distribution system

Liu, G. (author), Tao, Yu (author), Zhang, Ya (author), Lut, M.C. (author), Knibbe, Willem Jan (author), van der Wielen, Paul (author), Liu, Wentso (author), Medema, G.J. (author), van der Meer, W.G.J. (author)

Biofilm formation, loose deposit accumulation and water quality deterioration in drinking water distribution systems have been widely reported. However, the accumulation and distribution of harbored elements and microbes in the different niches (loose deposits, PVC-U biofilm, and HDPE biofilm) and their corresponding potential contribution to...

journal article 2017

document

Generation Y Interactions: Making the Office Catch Up

Liu, W. (author)

The rapid development of information technology in the past decade has enabled the introduction of a number of new communication tools and platforms in everyday life, such as instant messaging, podcasting, blogging and social networking. These tools offer people new ways of interacting, enabling them to create, retrieve and broadcast large...

doctoral thesis 2014

document

Interactive Pong: Exploring Ways of User Inputs through Prototyping with Sensors

Liu, W. (author), Stappers, P.J. (author), Pasman, G.J. (author), Van der Helm, A.J.C. (author), Aprile, W.A. (author), Keller, I. (author)

This study aimed to explore ways of user inputs through designing interactive game controllers with different type of sensor. From building four experiential prototypes on Pong, we learned to drive design by focusing on interaction qualities, which determine the use of sensors. We found that the interaction qualities together as a set offer a...

conference paper 2012

document

Researching interaction guidelines - Mapping playful quality to design interactive products

Chen, Y.C. (author), Liu, W. (author)

The interactions in IT supported activities in a Generation Y work context were studied and discussed, which general design guidelines have een revealed. However, further research about practical design guidelines hasn’t been performed. This study aims to serve as supplement of this part based on previous research. By applying contextual...

conference paper 2012

document

Studying the relative impact of ghosting and noise on the perceived quality of MR images

Liu, H. (author), Koonen, J. (author), Fuderer, M. (author), Heynderickx, I. (author)

In current magnetic resonance (MR) imaging systems, design choices are confronted with a trade-off between structured (i.e. artifacts) and unstructured noise. The impact of both types of noise on perceived image quality, however, is so far unknown, while this knowledge would be highly beneficial for further improvement of MR imaging systems. In...

conference paper 2012

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Interactions of visual attention and quality perception

Redi, J.A. (author), Liu, H. (author), Zunino, R. (author), Heynderickx, I.E.J.R. (author)

Several attempts to integrate visual saliency information in quality metrics are described in literature, albeit with contradictory results. The way saliency is integrated in quality metrics should reflect the mechanisms underlying the interaction between image quality assessment and visual attention. This interaction is actually two-fold: (1)...

journal article 2011

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Issues in the design of a no-reference metric for perceived blur

Liu, H. (author), Heynderickx, I. (author)

Developing an objective metric, which automatically quantifies perceived image quality degradation induced by blur, is highly beneficial for current digital imaging systems. In many applications, these objective metrics need to be of the noreference (NR) type, which implies that quality prediction is based on the distorted image only. Recent...

journal article 2011

document

Issues in the design of a no-reference metric for perceived blur

Liu, H. (author), Heynderickx, I. (author)

Developing an objective metric, which automatically quantifies perceived image quality degradation induced by blur, is highly beneficial for current digital imaging systems. In many applications, these objective metrics need to be of the noreference (NR) type, which implies that quality prediction is based on the distorted image only. Recent...

conference paper 2010