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Automatic diagnosis and control of distributed solid state lighting systems

Dong, J. (author), van Driel, W.D. (author), Zhang, Kouchi (author)

This paper describes a new design concept of automatically diagnosing and compensating LED degradations in distributed solid state lighting (SSL) systems. A failed LED may significantly reduce the overall illumination level, and destroy the uniform illumination distribution achieved by a nominal system. To our knowledge, an automatic scheme to...

journal article 2011

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A rapid method of estimating the solar irradiance spectra with potential lighting applications

Gao, Y. (author), Dong, J. (author), Isabella, O. (author), Zeman, M. (author), Zhang, G (author)

Diverse solar irradiance spectra can be observed under different conditions of time, date, location, weather, etc. Since the solar irradiance spectrum is required by certain scientific and engineering applications, obtaining accurate spectral data is essential. Measurements by spectrophotometers are able to achieve accurate real-time data with...

conference paper 2016

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Enhanced Optical Performance of BaMgAl₁₀O₁₇: Eu²⁺ Phosphor by a Novel Method of Carbon Coating

Yin, L.J. (author), Dong, Juntao (author), Wang, Yinping (author), Zhang, Bi (author), Zhou, Zheng Yang (author), Jian, Xian (author), Wu, Mengqiang (author), Xu, Xin (author), van Ommen, J.R. (author), Hintzen, H.T.J.M. (author)

Many strategies have been adopted to improve thermal degradation of phosphors. Because of the stability and high transmittance of graphene, here we report a novel method of carbon coating on BaMgAl₁₀O₁₇:Eu²⁺ (BAM) phosphor particles through chemical vapor deposition. The chemical composition, microstructure,...

journal article 2016

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Identification and Robust Control of the Nonlinear Photoelectrothermal Dynamics of LED Systems

Dong, J. (author), Zhang, Kouchi (author)

In lighting systems consisting light-emitting diodes (LEDs), excessive temperature is a main cause of degraded luminous efficacy, which leads to reduced average illuminance and distorted illumination rendering. Modeling the thermal dynamics of LEDs is hence essential in designing thermal dissipators and controllers for maintaining constant...

journal article 2017

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Analysis of the interaction between moving α/γ interfaces and interphase precipitated carbides during cyclic phase transformations in a Nb-containing Fe-C-Mn alloy

Dong, Haokai (author), Chen, Hao (author), Wang, Wei (author), Zhang, Yongjie (author), Miyamoto, Goro (author), Furuhara, Tadashi (author), Zhang, Chi (author), Yang, Zhigang (author), van der Zwaag, S. (author)

The interaction between moving α/γ interfaces and interphase precipitated (IPd) carbides during the austenite (γ) to ferrite (α) and the ferrite (α) to austenite (γ) transformation has been systematically investigated through cyclic phase transformation experiments for a 0.1C-1.5Mn alloy containing 0.1 wt% Niobium (Nb) and its Nb-free...

journal article 2018

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Biocatalytic Oxidation Reactions: A Chemist's Perspective

Dong, J. (author), Fernandez Fueyo, E. (author), Hollmann, F. (author), Paul, C.E. (author), Pesic, M. (author), Schmidt, S. (author), Wang, Yonghua (author), Younes, S.H.H. (author), Zhang, W. (author)

Oxidation chemistry using enzymes is approaching maturity and practical applicability in organic synthesis. Oxidoreductases (enzymes catalysing redox reactions) enable chemists to perform highly selective and efficient transformations ranging from simple alcohol oxidations to stereoselective halogenations of non‐activated C−H bonds. For many of...

journal article 2018

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A photovoltaic window with sun-tracking shading elements towards maximum power generation and non-glare daylighting

Gao, Y. (author), Dong, J. (author), Isabella, O. (author), Santbergen, R. (author), Tan, H. (author), Zeman, M. (author), Zhang, Kouchi (author)

Vertical space bears great potential of solar energy especially for congested urban areas, where photovoltaic (PV) windows in high-rise buildings can contribute to both power generation and daylight harvest. Previous studies on sun-tracking PV windows strayed into the trade-off between tracking performance and mutual shading, failing to achieve...

journal article 2018

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Relationship between the size of the samples and the interpretation of the mercury intrusion results of an artificial sandstone

Dong, H. (author), Zhang, H. (author), Zuo, Y. (author), Gao, P. (author), Ye, G. (author)

Mercury intrusion porosimetry (MIP) measurements are widely used to determine pore throat size distribution (PSD) curves of porous materials. The pore throat size of porous materials has been used to estimate their compressive strength and air permeability. However, the effect of sample size on the determined PSD curves is often overlooked....

journal article 2018

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A Novel Disturbance Observer Design for a Larger Class of Nonlinear Strict-Feedback Systems via Improved DSC Technique

Zhang, Wenqian (author), Dong, Wenhan (author), Dong, Shuangyu (author), Lv, Maolong (author), Liu, Zongcheng (author)

A novel scheme for disturbance observer is designed for an extended class of strict-feedback nonlinear systems with possibly unbounded, non-smooth, and state-independent compounded disturbance. To overcome these problems in disturbance observer design, the typical slide mode differentiators are improved by introducing hyperbolic tangent...

journal article 2019

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Formate Oxidase (FOx) from Aspergillus oryzae: One Catalyst Enables Diverse H ₂ O ₂ -Dependent Biocatalytic Oxidation Reactions

Tieves, F. (author), Willot, S.J. (author), van Schie, M.M.C.H. (author), Rauch, M.C.R. (author), Younes, S.H.H. (author), Zhang, W. (author), Dong, J. (author), Gomez de Santos, P. (author), Hollmann, F. (author)

An increasing number of biocatalytic oxidation reactions rely on H ₂ O ₂ as a clean oxidant. The poor robustness of most enzymes towards H ₂ O ₂ , however, necessitates more efficient systems for in situ H ₂ O ₂ generation. In analogy to the well-known formate dehydrogenase to...

journal article 2019

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Eco-efficiency assessment of technological innovations in high-grade concrete recycling

Zhang, Chunbo (author), Hu, Mingming (author), Dong, L. (author), Gebremariam, A.T. (author), Mirand-Xicotencatl, Brenda (author), Di Maio, F. (author), Tukker, Arnold (author)

The increasing volume of Construction and demolition waste (CDW) associated with economic growth is posing challenges to the sustainable management of the built environment. The largest fraction of all the CDW generated in the member states of the European Union (EU) is End-of-life (EOL) concrete. The most widely applied method for EOL concrete...

journal article 2019

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An Improved Deadbeat Predictive Current Control with Online Parameter Identification for Surface-Mounted PMSMs

Yao, Yu (author), Huang, Yunkai (author), Peng, Fei (author), Dong, J. (author), Zhang, Hanqi (author)

In this article, an improved deadbeat predictive current control (DPCC) method with parameters identification for surface-mounted permanent magnet synchronous machines (SPMSMs) is proposed. With the proposed DPCC method, zero steady-state current error and deadbeat dynamic current response could be achieved, even with inaccurate initial motor...

journal article 2020

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Elucidating the effect of accelerated carbonation on porosity and mechanical properties of hydrated Portland cement paste using X-ray tomography and advanced micromechanical testing

Zhang, H. (author), Romero Rodriguez, C. (author), Dong, H. (author), Gan, Y. (author), Schlangen, E. (author), Šavija, B. (author)

Carbonation of hydrated cement paste (HCP) causes numerous chemo-mechanical changes in the microstructure, e.g., porosity, strength, elastic modulus, and permeability, which have a significant influence on the durability of concrete structures. Due to its complexity, much is still not understood about the process of carbonation of HCP. The...

journal article 2020

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A sectoral eco-efficiency analysis on urban-industrial symbiosis

Bian, Yuli (author), Dong, Liang (author), Liu, Z. (author), Zhang, Lezhu (author)

Urban-industrial symbiosis (UIS) is an important system innovation via sectors integration, and has been widely recognized as a novel pathway for achieving regional eco-industrial development. Eco-efficiency, as a mature approach and indicator, offers an effective tool to uncover both the status and trends of such a transformation. However,...

journal article 2020

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Mitigating the autogenous shrinkage of alkali-activated slag by internal curing

Li, Z. (author), Wyrzykowski, Mateusz (author), Dong, H. (author), Zhang, Shizhe (author), Lura, Pietro (author), Ye, G. (author)

Alkali activated slag (AAS) has shown promising potential to replace ordinary Portland cement as a binder material. Synthesized from industrial by-products, AAS can show high strength, thermal resistance and good durability. However, AAS has been reported to exhibit high autogenous shrinkage. Autogenous shrinkage is a critical issue for building...

conference paper 2021

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Barrier Lypunov functions-based nonsingular fixed-time switching control for strict-feedback nonlinear dynamics with full state constraints

Zhang, Wenqian (author), Dong, Wenhan (author), Lv, Maolong (author), Liu, Zongcheng (author), Zhou, Yang (author), Feng, Haoming (author)

This work proposes a nonsingular adaptive fixed-time switching control method for a class of strict-feedback nonlinear dynamics subject to full state constraints. The peculiarity of this design lies in overcoming the singularity issue that typically appears in the existing backstepping-based fixed-time control methods caused by the iterative...

journal article 2021

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Sbs modified bitumen with organic layered double hydroxides: Compatibility and aging effects on rheological properties

Zhang, Canlin (author), Dong, Hongjun (author), Yan, Zhengli (author), Yu, Meng (author), Wang, Ting (author), Xu, S. (author), Jiang, Zhenliang (author), Hu, Changbin (author)

SBS-modified bitumen (SMB) is susceptible to aging, which seriously influences its service performance and life. In order to strengthen the anti-aging ability of SMB, triethoxyvinylsilane was designed to organically modify layered double hydroxides (LDHs) and was applied to modify SMB. The dispersibility and storage stability of LDHs in SMB...

journal article 2021

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Mitigating the autogenous shrinkage of alkali-activated slag by internal curing

Li, Zhenming (author), Wyrzykowski, Mateusz (author), Dong, Hua (author), Zhang, Shizhe (author), Lura, Pietro (author), Ye, Guang (author)

Alkali activated slag (AAS) has shown promising potential to replace ordinary Portland cement as a binder material. Synthesized from industrial by-products, AAS can show high strength, thermal resistance and good durability. However, AAS has been reported to exhibit high autogenous shrinkage. Autogenous shrinkage is a critical issue for building...

conference paper 2021

document

Effect of CA bacteria on the carbonation process of γ-C2S

Jin, Peng (author), Wang, Ruixing (author), Zhang, Siyi (author), Dong, Hua (author), Chen, Chun (author)

Carbonation has been proven to be a promising way to improve the mechanism properties and durability of steel slag products. CA bacteria can promote the hydration of CO2. In this study, one kind of alkali-resistant CA bacteria was chosen to investigate its effects on the carbonation process of γ-C2S. Results showed that bacteria could increase...

conference paper 2021

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Analysis and data-based modeling of the photochemical reaction dynamics of the induced singlet oxygen in light therapies

Wang, T. (author), Dong, Jianfei (author), Zhang, Kouchi (author)

Objective: The macroscopic singlet oxygen (MSO) model for quantifying the light-induced singlet oxygen ($^{1}O_{2}$) always contain a set of nonlinear dynamic equations and therefore are generally difficult to be applied. This work was devoted to analyze and simplify this dynamic model. Methods: Firstly, the nonlinearity of the MSO model was...

journal article 2022