Prof. Denvid Lau Profile

Prof. Denvid Lau

Professor at City Univ of Hong Kong

SPIE Involvement:

Conference Program Committee | Author

Area of Expertise:

behavior and design of concrete structures , durability of materials , fiber-reinforced polymer (FRP) composites in structural rehabilitation , interfacial fracture mechanics , molecular dynamics simulations , tree defect detection and repair

Websites:

Personal Website

Denvid obtained his Ph.D. in the field of structures and materials from MIT in 2012. He has become an Professor with tenure at CityU since 2018. From January to July 2020, he was a visiting professor at MIT CEE. His research focuses on functionalized construction materials, multiscale modeling of organic-inorganic system, moisture-induced debonding, durability of concrete-epoxy system and fiber-reinforced polymer (FRP) composites in structural rehabilitation. He is currently the editorial board member of several international journals. He has published more than 170 referred journal and conference articles and has delivered more than 40 invited talks, which include plenary and keynote speeches in international conferences. Since 2018, Denvid has been nominated and selected as a Founding Member of the Hong Kong Young Academy of Sciences. He has received one of The President's Awards from CityU, in recognition of his remarkable academic achievement.

Proceedings Article | 18 April 2023 Presentation + Paper

Transparent photothermal nanocomposite coating based on copper sulfide nanoparticles for photothermal deicing

Denvid Lau, Rui Tang, Wei Jian

Proceedings Volume 12487, 124870G (2023) https://doi.org/10.1117/12.2658075

KEYWORDS: Coating, Glasses, Nanoparticles, Ice, Nanocomposites, Visible radiation

Read Abstract +

Ice formation and accretion on windows of buildings and windshields of automobile lead to various inconveniences and operational difficulties in cold regions. To prevent ice accretion and fasten ice removal on glass, a new generation of transparent deicing materials with high efficiency and energy saving is highly expected through low-cost approaches. However, conventional anti-icing/deicing coatings are opaque materials that are difficult to implement on automotive glass and building windows. As a typical photothermal semiconductor material, Cu2-xS has high near infrared (NIR) light absorbance and excellent photothermal conversion realized by excitation and relaxation of electron-hole pairs, which differs from noble metal nanoparticles. The unique advantage makes Cu2-xS is used widely in photothermal tumor and cancer therapy, while the application in anti/deicing area is limited. Here, we develop a low-cost transparent photothermal nanocomposite coating based on solution-processed Cu2-xS for active photothermal deicing. The photothermal nanocomposite coating was first prepared by the integration of Cu2-xS nanoparticles and commercially available acrylic paints, and then brushed onto glass surfaces of automobile and buildings. The deicing results show that when exposed to the near-infrared laser illumination at the wavelength of 808 nm, the surface coating temperature of glass covered with 3mm ice layer rapidly increases over 30℃ and the ice layer melts in 300 seconds at different ambient temperatures of -16 ℃, -20℃ and -24℃, demonstrating the high light-to-heat conversion efficiency and remarkable deicing property of transparent photothermal coating under extreme cold conditions. This study of transparent photothermal nanocomposite coating fabricated by simple brushing method provides enormous potential for ice removal applications on glass in building structures and automobile without highly affecting the visible transmittance, which is expected for further development in various shaped components.

Proceedings Article | 18 April 2022 Presentation + Paper

Application of machine learning for defect detection in FRP-bonded systems with different defect sizes

Denvid Lau, Wei Jian

Proceedings Volume 12047, 1204719 (2022) https://doi.org/10.1117/12.2612826

KEYWORDS: Fiber reinforced polymers, Defect detection, Associative arrays, Reconstruction algorithms, Machine learning, Acoustics, Signal processing, Nondestructive evaluation, Chemical species, Signal detection

Read Abstract +

Proceedings Article | 22 March 2021 Presentation + Paper

Effect of sampling rates on the accuracy of acoustic-laser technique in defect detection and upsampling using machine learning

Renyuan Qin, Denvid Lau

Proceedings Volume 11592, 115920G (2021) https://doi.org/10.1117/12.2582919

KEYWORDS: Defect detection, Machine learning, Nondestructive evaluation, Fiber reinforced polymers, Data acquisition, Target detection, Signal detection, Composites, Acoustics

Read Abstract +

Proceedings Article | 22 April 2020 Presentation + Paper

Use of high-speed camera for defect detection in FRP bonded system under different excitation methods

Qiwen Qiu, Renyuan Qin, Denvid Lau

Proceedings Volume 11380, 1138017 (2020) https://doi.org/10.1117/12.2558066

KEYWORDS: Fiber reinforced polymers, High speed cameras, Imaging systems, Defect detection

Read Abstract +

Proceedings Article | 1 April 2019 Paper

Grain effect on the accuracy of defect detection in wood structure by using acoustic-laser technique

Denvid Lau, Qiwen Qiu

Proceedings Volume 10971, 109710X (2019) https://doi.org/10.1117/12.2514285

KEYWORDS: Defect detection, Nondestructive evaluation, Inspection, Acoustics, Civil engineering

Read Abstract +

Proceedings Article | 27 March 2018 Paper

Tomography reconstruction methods for damage diagnosis of wood structure in construction field

Denvid Lau, Qiwen Qiu

Proceedings Volume 10599, 105991S (2018) https://doi.org/10.1117/12.2296328

KEYWORDS: Tomography, Defect detection, Nondestructive evaluation, Acoustics, Ultrasonics

Read Abstract +

Proceedings Article | 19 April 2017 Paper

Defect visualization in FRP-bonded concrete by using high speed camera and motion magnification technique

Denvid Lau, Qiwen Qiu

Proceedings Volume 10169, 101692D (2017) https://doi.org/10.1117/12.2259916

KEYWORDS: Video, High speed cameras, Fiber reinforced polymers, Visualization, Video processing, Epoxies, Nondestructive evaluation, Defect detection, Composites, Inspection

Read Abstract +

Proceedings Article | 22 April 2016 Paper

A review of nondestructive testing approaches using mechanical and electromagnetic waves

Denvid Lau, Qiwen Qiu

Proceedings Volume 9804, 98042E (2016) https://doi.org/10.1117/12.2218739

KEYWORDS: Nondestructive evaluation, Electromagnetic radiation, Reflection, Defect detection, Ultrasonics, Laser interferometry, Acoustic emission, Fiber lasers, Acoustics, Optical fibers

Read Abstract +

Proceedings Article | 22 April 2016 Presentation + Paper

Use of laser reflection technique for defect detection in CFRP-concrete systems

Qiwen Qiu, Denvid Lau

Proceedings Volume 9804, 98041C (2016) https://doi.org/10.1117/12.2218751

KEYWORDS: Reflection, Defect detection, Laser systems engineering, Carbon, Fiber reinforced polymers, Fiber lasers, Digital cameras, Inspection, Nondestructive evaluation, Osmium, Composites, Foam, Epoxies, Laser bonding

Read Abstract +

Proceedings Article | 1 April 2015 Paper

Experimental evaluation on the effectiveness of acoustic-laser technique towards the FRP-bonded concrete system

Denvid Lau, Qiwen Qiu

Proceedings Volume 9437, 943705 (2015) https://doi.org/10.1117/12.2086479

KEYWORDS: Acoustics, Fiber reinforced polymers, Defect detection, Nondestructive evaluation, Composites, Scanning probe lithography, Inspection, Acoustic emission, Thermography, Testing and analysis

Read Abstract +

Proceedings Article | 10 April 2014 Paper

Vibrational characteristics of FRP-bonded concrete interfacial defects in a low frequency regime

Denvid Lau, Tin Kei Cheng

Proceedings Volume 9063, 90630R (2014) https://doi.org/10.1117/12.2044860

KEYWORDS: Fiber reinforced polymers, Acoustics, Epoxies, Interfaces, Signal to noise ratio, Nondestructive evaluation, Composites, Finite element methods, Structural health monitoring, Defect detection

Read Abstract +

Proceedings Article | 16 April 2013 Paper

One dimensional predictive model of interfacial stiffness in FRP-bonded concrete system using acoustic-laser technique

Denvid Lau

Proceedings Volume 8694, 86940W (2013) https://doi.org/10.1117/12.2010251

KEYWORDS: Fiber reinforced polymers, Acoustics, Interfaces, Nondestructive evaluation, Defect detection, Glasses, Systems modeling, Adhesives, Transducers, Epoxies

Read Abstract +

Showing 5 of 12 publications

Conference Committee Involvement (11)

Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XVIII

25 March 2024 | Long Beach, California, United States

Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XVII

13 March 2023 | Long Beach, California, United States

Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XVI

7 March 2022 | Long Beach, California, United States

Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XV

22 March 2021 | Online Only, California, United States

Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XIV

27 April 2020 | Online Only, California, United States

Showing 5 of 11 Conference Committees

Keywords/Phrases

Search In:

Publication Years