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Utilization of microwave steam pyrolysis to produce biochar for thermal energy storage

Waste Disposal and Sustainable Energy 2022年第4期4卷 335-341页

作者： Wahap bin Abu Bakar Peter Nai Yuh Yek Kah Yein Cheong Augustine Chioma Affam chee chung wong Rock Keey Liew Yie Hua Tan Su Shiung Lam Centre for Research of Innovation and Sustainable Development University of Technology SarawakNo.1Jalan University96000SibuMalaysia Centre on Technological Readiness and Innovation in Business Technopreneurship(CONTRIBUTE) University of Technology Sarawak96000SibuSarawakMalaysia NV Western PLT No.208BSecond FloorMacalister Road10400GeorgetownPenangMalaysia Department of Chemical and Energy Engineering Faculty of Engineering and ScienceCurtin University MalaysiaCDT 25098009MiriSarawakMalaysia Higher Institution Centre of Excellence(HICoE) Institute of Tropical Aquaculture and Fisheries(AKUATROP)Universiti Malaysia Terengganu21030 Kuala NerusTerengganuMalaysia

Microwave steam pyrolysis(MSP)is an innovative thermochemical approach to converting biomass into high-quality biochar using steam to improve the dielectric heating of microwave *** shows high fixed carbon and carbon contents at a maximum temperature of 550℃in 10 *** MSP achieved a heating rate of 112℃/min from 200℃to 400℃to produce biochar ***,the thermal properties of biochar in microwave heating were investigated in this study to explore its potential as a microwave heat-absorbent *** is able to perform volumetric and controllable heating to the ***,biochar shows good microwave heat absorbency,storing and transferring heat *** temperature profile of three different sizes of biochar was investigated to examine the efficiency of biochar in heat absorption from microwave *** was found that the powder form of biochar showed a higher heat transfer rate of 40℃/min and a low cooling rate of 7.5℃/*** presented results are useful for evaluating the application of biochar as a promising medium for heat storage systems.

关键词： Microwave Steam Pyrolysis Biochar Thermal Storage

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Current advances of stem cell-based therapy for kidney diseases

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World Journal of Stem Cells 2021年第7期13卷 914-933页

作者： chee-Yin wong Faculty of Medicine and Health Sciences Universiti Tunku Abdul RahmanKajang 43000SelangorMalaysia Research Department CytopeuticsCyberjaya 63000SelangorMalaysia

Kidney diseases are a prevalent health problem around the *** therapy used in the current routine treatment for kidney diseases can only delay disease *** of these drugs or treatments can reverse the progression to an end-stage of the ***,it is crucial to explore novel therapeutics to improve patients’quality of life and possibly cure,reverse,or alleviate the kidney *** cells have promising potentials as a form of regenerative medicine for kidney diseases due to their unlimited replication and their ability to differentiate into kidney cells in *** evidences from the administration of stem cells in an experimental kidney disease model suggested that stem cell-based therapy has therapeutic or renoprotective effects to attenuate kidney damage while improving the function and structure of both glomerular and tubular *** review summarises the current stem cell-based therapeutic approaches to treat kidney diseases,including the various cell sources,animal models or in vitro *** challenges of progressing from proof-of-principle in the laboratory to widespread clinical application and the human clinical trial outcomes reported to date are also *** success of cell-based therapy could widen the scope of regenerative medicine in the future.

关键词： Stem cells Kidney regeneration Kidney disease Mesenchymal stem cells Embryonic stem cells Induced pluripotent stem cells

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An integrated approach for machine-learning-based system identification of dynamical systems under control:application towards the model predictive control of a highly nonlinear reactor system

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Frontiers of Chemical Science and Engineering 2022年第2期16卷 237-250页

作者： Ewan chee Wee Chin wong Xiaonan Wang Department of Chemical&Biomolecular Engineering Faculty of EngineeringNational University of SingaporeSingapore 117585Singapore Chemical Engineering&Food Technology Cluster Singapore Institute of TechnologySingapore 138683Singapore

Advanced model-based control strategies,e.g.,model predictive control,can offer superior control of key process variables for multiple-input multiple-output *** quality of the system model is critical to controller performance and should adequately describe the process dynamics across its operating range while remaining amenable to fast *** work articulates an integrated system identification procedure for deriving black-box nonlinear continuous-time multiple-input multiple-output system models for nonlinear model predictive *** showcase this approach,five candidate models for polynomial and interaction features of both output and manipulated variables were trained on simulated data and integrated into a nonlinear model predictive controller for a highly nonlinear continuous stirred tank reactor *** procedure successfully identified system models that enabled effective control in both servo and regulator problems across wider operating *** controllers also had reasonable per-iteration times of ca.0.1 *** demonstration of how such system models could be identified for nonlinear model predictive control without prior knowledge of system dynamics opens further possibilities for direct data-driven methodologies for model-based control which,in the face of process uncertainties or modelling limitations,allow rapid and stable control over wider operating ranges.

关键词： nonlinear model predictive control black-box modeling continuous-time system identification machine learning industrial applications of process control

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Hydrodynamical self-interference of a scattered polariton quanta

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Light(Science & Applications) 2020年第1期9卷 541-542页

作者： Jiahui Huang Wei Liu chee Wei wong Mesoscopic Optics and Quantum Electronics Laboratory University of CaliforniaLos AngelesCA 90095USA

Researchers have observed the free-propagation of a single microcavity polariton directly and its self-interference when scattering upon a *** experimental observations of quantum hydrodynamics in the single polariton limit test the wave-particle duality and aid in the development of polariton-based photonic circuits in quantum information processing.

关键词： defect polar quantum

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Science Letters:Human-centered modeling for style-based adaptive games

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第4期10卷 530-534页

作者： chee-onn wong Jongin KIM Eunjung HAN Keechul JUNG Human-Centered Interfaces Lab Department of Digital Media Soongsil UniversitySeoul 156743 Korea

This letter proposes a categorization matrix to analyze the playing style of a computer game player for a shooting game genre. Our aim is to use human-centered modeling as a strategy for adaptive games based on entertainment measure to evaluate the playing experience. We utilized a self-organizing map (SOM) to cluster the player's style with the data obtained while playing the game. We further argued that style-based adaptation contributes to higher enjoyment, and this is reflected in our experiment using a supervised multilayered perceptron (MLP) network.

关键词： Player modeling Categorization matrix Adaptive games Human-centered modeling Data clustering

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Optomechanically-induced-transparency cooling of massive mechanical resonators to the quantum ground state

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Science China(Physics,Mechanics & Astronomy) 2015年第5期58卷 46-51页

作者： LIU Yong-Chun XIAO Yun-Feng LUAN Xing-Sheng wong chee Wei State Key Laboratory for Mesoscopic Physics and School of Physics Peking University Collaborative Innovation Center of Quantum Matter Optical Nanostructures Laboratory Columbia University

Ground state cooling of massive mechanical objects remains a difficult task restricted by the unresolved mechanical sidebands. We propose an optomechanically-induced-transparency cooling scheme to achieve ground state cooling of mechanical motion without the resolved sideband condition in a pure optomechanical system with two mechanical modes coupled to the same optical cavity mode. We show that ground state cooling is achievable for sideband resolution ωm/k as low as - 0.003. This provides a new route for quantum manipulation of massive macroscopic devices and high-precision measurements.

关键词： ground state cooling resolved sideband limit optomechanics

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Optimal location query based on k nearest neighbours

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Frontiers of Computer Science 2021年第2期15卷 105-117页

作者： Yubao LIU Zitong CHEN Ada Wai-chee FU Raymond Chi-Wing wong Genan DAI School of Data and Computer Science Sun Yat-Sen UniversityGuangzhou510006China Guangdong Key Laboratory of Big Data Analysis and Processing Guangzhou510006China Department of Computer Science and Engineering Chinese University of Hong KongHong Kong999077China Department of Computer Science and Engineering The Hong Kong University of Science and TechnologyHong Kong999077China

Optimal location query in road networks is a basic operation in the location intelligence *** a set of clients and servers on a road network,the purpose of optimal location query is to obtain a location for a new server,so that a certain objective function calculated based on the locations of clients and servers is *** works assume no labels for servers and that a client only visits the nearest *** assumptions are not realistic and it renders the existing work not useful in many *** this paper,we relax these assumptions and consider the k nearest neighbours(KNN)of *** introduce the problem of KNN-based optimal location query(KOLQ)which considers the k nearest servers of clients and labeled *** also introduce a variant problem called relocation KOLQ(RKOLQ)which aims at relocating an existing server to an optimal *** main analysis algorithms are proposed for these *** experiments on the real road networks illustrate the efficiency of our proposed solutions.

关键词： optimal location query k nearest neighbours road network

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Design, Synthesis, Photophysical Studies and Electrochemistry of Carbazole-, Oxadiazole-, and Oxadiazole-Triarylamine-Containing Rhenium(Ⅰ) Diimine Alkynyl Complexes

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Chinese Journal of Chemistry 2014年第10期32卷 1015-1021页

作者： Wai-Kin chung Keith Man-chung wong Vivian Wing-Wah Yam and Department of ChemistryThe University of Hong KongPokfulam RoadHong KongChina

A series of rhenium(I)diimine alkynyl complexes with various electron-and hole-transporting moieties has been synthesized and *** electronic absorption,emission and electrochemical properties have also been studied.

关键词： electrochemistry luminescence metal alkynyl rhenium(Ⅰ)diimine,UV/Vis spectroscopy

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Applications of Non-destructive Tests for Diagnosis of Heritage Buildings:Case Studies from Singapore and Malaysia

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Built Heritage 2019年第1期3卷 14-25页

作者： chung Wan wong MAEK Consulting Pte Ltd Singapore

Non-destructive tests have been increasingly used in historic buildings not only for pre-restoration investigation but also as useful tools to evaluate the effectiveness of eventual *** tests can complement and supplement destructive tests like laboratory analysis of extracted samples as long as a sound sampling plan has been put in place to commensurate with the pattern and extent of dilapidation and materials *** methods employed in projects in Singapore and Malaysia include the infrared thermography,ground penetrating radar,microwave moisture tomography and ultrasonic pulse echo *** paper discusses about a selection of case studies,demonstrating the application of various techniques for the identification of hidden details,defects and deterioration,and moisture detection.

关键词： non-destructive tests infrared thermography radar ultrasonic pulse echo microwave

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Synthesis and enhanced piezoelectric response of CVD-grown SnSe layered nanosheets for flexible nanogenerators

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Nano Research 2023年第9期16卷 11839-11845页

作者： Fumei Yang Man-chung wong Jianfeng Mao Zehan Wu Jianhua Hao Department of Applied Physics the Hong Kong Polytechnic UniversityHong Kong 999077China

Piezoelectricity is the electric charge which accumulates in certain materials in response to mechanical stimuli,while piezoelectric nanogenerators(PENGs)converting mechanical energy into electricity can be widely used for energy harvesting and self-powered *** group IV-VI monochalcogenides may exhibit strong piezoelectricity because of their puckered C_(2v)symmetry and electronic structure,making them promising for flexible ***,we investigated the synthesis and piezoelectric properties of multilayer SnSe nanosheets grown by chemical vapor deposition(CVD).The SnSe nanosheets exhibited high single-crystallinity,large area,and good *** strong layer-dependent in-plane piezoelectric coefficient of SnSe nanosheets showed a saturated trend to be~110 pm/V,which overcomes the weak piezoelectric response or odd-even effects in other layered nanosheets.A high energy conversion efficiency of 9.3%and a maximum power density of 538 mW/cm^(2)at 1.03%strain have been demonstrated in a SnSe-based *** on the enhanced piezoelectricity of SnSe and attractive output performance of the nanogenerator,a self-powered sensor for human motion monitoring is further *** results demonstrate the strong piezoelectricity in high quality CVD-grown SnSe nanosheets,allowing for application in flexible smart piezoelectric sensors and advanced microelectromechanical devices.

关键词： SnSe piezotronics piezoresponse force microscope piezoelectric nanogenerator self-powered device

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