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An atmospheric water harvester with fast and energy-saving water removal and recovery

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Biosurface and Biotribology 2023年第1期9卷 9-16页

作者： Jiayu Song Zhang Liu Jhoanne Pedres Boñgol Zhaoxin Zhang king lun yeung Department of Chemical and Biological Engineering the Hong Kong University of Science and TechnologyKowloonHong Kong Division of Environment and Sustainability the Hong Kong University of Science and TechnologyKowloonHong Kong Division of Emerging Interdisciplinary Areas The Hong Kong University of Science and TechnologyKowloonHong Kong HKUST Shenzhen-Hong Kong Collaborative Innovation Research Institute ShenzhenGuangdongChina

Moisture removal and water recovery from the air are vital for regulating indoor humidity and mitigating water *** atmospheric water harvesters(AWH)focus primarily on increasing the moisture capture rate,but for it to be economical and sustainable,it is essential to consider the energy required to recover and harvest the captured ***,a mechanically flexible,biphilic sorption-based AWH made of green,environmentally friendly material is *** consists of a hygroscopic chitosan polymer embedded within a flexible,hydrophobic silica xerogel that can harvest 86.3 g water/g chitosan at 97%relative humidity and 25℃reaching saturation after 30 days(i.e.2.88 g water/g chitosan/day).Roughly 88%of the sorbed moisture was recovered by mechanical squeezing(ca.0.020 MPa)within 150 *** water harvesting experiments and uniaxial compression tests demonstrate that chitosan-silica xerogel is durable for longterm operations,providing a fast,reliable,and sustainable moisture removal and water harvesting tool.

关键词： atmospheric water harvesting flexible xerogel heterogeneous wettability mechanical water recovery

澄清溶液体系二次生长法NaA型沸石膜的生长机制及膜厚的控制合成

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高等学校化学学报 2005年第5期26卷 806-810,F005页

作者：张雄福刘海鸥 king-lun yeung 王金渠大连理工大学化工学院化学工艺系吸附与无机膜研究所大连116012 香港科技大学化学工程系

用晶种涂层二次生长成膜法研究了在含水量不同的澄清溶液合成体系中NaA型沸石膜的生长及沸石膜厚度的控制合成.用SEM,TEM和XRD表征手段分析了沸石膜的形成过程和微结构.在载体表面不涂晶种而直接合成则不易形成连续沸石膜;用晶种涂层二... 详细信息

用晶种涂层二次生长成膜法研究了在含水量不同的澄清溶液合成体系中NaA型沸石膜的生长及沸石膜厚度的控制合成.用SEM,TEM和XRD表征手段分析了沸石膜的形成过程和微结构.在载体表面不涂晶种而直接合成则不易形成连续沸石膜;用晶种涂层二次法可以很容易形成均匀的连续膜.合成液中水量的高低强烈影响沸石膜的生长速率、形成结构和膜的厚度.在高水量(水硅摩尔比为2000)的合成体系中沸石生长速率慢,膜主要通过晶种层中的晶粒长大,交织成膜,且膜只有一层结构;而在低水量(水硅摩尔比为750)的合成体系中沸石生长速率快,膜则通过晶种层表面晶粒向外生长、交织成膜,而膜具有两层结构.通过调变合成液的水量可有效地控制沸石膜层的厚度,并能制得非常均匀、连续的膜.

关键词： NaA 沸石分子筛膜无机膜

用亚微米级晶种涂层法合成NaA沸石膜及其结构表征

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催化学报 2004年第7期25卷 586-590页

作者：张雄福刘海鸥王金渠 king lun yeung 大连理工大学化工学院化学工艺系吸附与无机膜研究所辽宁大连116012 香港科技大学化学工程系

在大孔α Al2 O3 陶瓷管载体上 ,采用亚微米级晶种涂层法在澄清溶液体系中二次生长成膜 ,制备了NaA沸石膜 .采用TEM ,SEM和XRD等手段对晶种、陶瓷载体及沸石膜的结构、晶体形貌和成膜情况进行了表征 .结果表明 ,合成晶种的晶粒呈立方体 ... 详细信息

在大孔α Al2 O3 陶瓷管载体上 ,采用亚微米级晶种涂层法在澄清溶液体系中二次生长成膜 ,制备了NaA沸石膜 .采用TEM ,SEM和XRD等手段对晶种、陶瓷载体及沸石膜的结构、晶体形貌和成膜情况进行了表征 .结果表明 ,合成晶种的晶粒呈立方体 ,颗粒小 (约 1 5 0nm)而均匀 ,无杂晶 ,可作为晶种在载体上进行预涂 .载体的孔径大而不均匀 ,表面粗糙不平整 ,直接成膜则表面仅有较少的沸石晶粒沉积 ,不能连续成膜 .经亚微米级晶种涂层后 ,载体表面形成了一层均匀、光滑的晶种层(厚度为 2～ 3μm) ;水热晶化成膜后 ,膜表面晶粒相互交织生长完好 ,无晶间隙 ,所得膜致密 ,连续 ,规整 ,清晰 ,无裂缺 .

关键词： NaA沸石沸石膜二次合成晶种涂层

Population Dynamics in an Advective Environment

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Communications on Applied Mathematics and Computation 2024年第1期6卷 399-430页

作者： king-yeung Lam Ray Lee Yuan Lou Department of Mathematics The Ohio State UniversityColumbusOH43210USA School of Mathematical Sciences CMA-Shanghai and MOE-LSCShanghai Jiao Tong UniversityShanghai200240China

We consider a one-dimensional reaction-diffusion equation describing single-and two-species population dynamics in an advective environment,based on the modeling frameworks proposed by Lutscher et *** *** analyze the effect of rate of loss of individuals at both the upstream and downstream *** the single-species case,we prove the existence of the critical domain size and provide explicit formulas in terms of model *** further derive qualitative properties of the critical domain size and show that,in some cases,the critical domain size is either strictly decreasing over all diffusion rates,or monotonically increasing after first decreasing to a *** also consider competition between species differing only in their diffusion *** two species having large diffusion rates,we give a sufficient condition to determine whether the faster or slower diffuser wins the *** also briefly discuss applications of these results to competition in species whose spatial niche is affected by shifting isotherms caused by climate change.

关键词： Reaction-diffusion-advection Critical domain size Competition Climate change

Segment routing for traffic engineering and effective recovery in low-earth orbit satellite constellations

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Digital Communications and Networks 2024年第3期10卷 706-715页

作者： Shengyu Zhang Xiaoqian Li Kwan Lawrence yeung Department of Electrical and Electronic Engineering The University of Hong KongHKSARChina National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology of ChinaChengduSichuan611731China

Low-Earth Orbit Satellite Constellations(LEO-SCs)provide global,high-speed,and low latency Internet access services,which bridges the digital divide in the remote *** inter-satellite links are not supported in initial deployment(*** Starlink),the communication between satellites is based on ground stations with radio frequency *** to the rapid movement of satellites,this hybrid topology of LEO-SCs and ground stations is time-varying,which imposes a major challenge to uninterrupted service provisioning and network *** this paper,we focus on solving two notable problems in such a ground station-assisted LEO-SC topology,i.e.,traffic engineering and fast reroute,to guarantee that the packets are forwarded in a balanced and uninterrupted ***,we employ segment routing to support the arbitrary path routing in *** solve the traffic engineering problem,we proposed two source routings with traffic splitting algorithms,Delay-Bounded Traffic Splitting(DBTS)and DBTS+,where DBTS equally splits a flow and DBTS+favors shorter ***-lation results show that DBTS+can achieve about 30%lower maximum satellite load at the cost of about 10%more *** guarantee the fast recovery of failures,two fast reroute mechanisms,Loop-Free Alternate(LFA)and LFA+,are studied,where LFA pre-computes an alternate next-hop as a backup while LFA+finds a 2-segment backup *** show that LFA+can increase the percentage of protection coverage by about 15%.

关键词： Fast reroute Low-earth orbit satellite constellation Segment routing Traffic engineering Traffic splitting

Impacts of electrochemical disinfection on the viability and structure of the microbiome in secondary effluent water

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Frontiers of Environmental Science & Engineering 2024年第5期18卷 73-83页

作者： Marvin yeung Lan Tian Yuhong Liu Hairong Wang Jinying Xi Environmental Simulation and Pollution Control State Key Joint Laboratory School of EnvironmentTsinghua UniversityBeijing100084China Graduate School at Shenzhen Tsinghua UniversityShenzhen518055China

Electrochemical disinfection(ECD)is a promising disinfection technique for wastewater reclamation;however,the impacts of ECD on the microbiome in secondary effluent wastewater remain *** this study,Propidium monoazide-qPCR(PMA-qPCR)and the plate count method were used to evaluate the inactivation performance,and the PMA-16S rRNA gene sequences of living cells were targeted to study the microbiome.A discrepancy was found between PMA-qPCR and the plate count method in the evaluation of cell count,with increases of 1.5 to 2.2 orders of magnitude in the disinfection rate after 150 s of ***,the cell count recovered and occasionally exceeded original levels within 3 d after *** was suppressed after ECD,but the microbiome after 150 s disinfection retained a higher level of evenness and stability in the community with a median Shannon index(>3.7).Pathogenic bacteria remained high in relative abundance even after 150 s of 25 V disinfection,but the biofilm-forming population was effectively suppressed by *** co-occurrence network revealed a centralized and fragile network as disinfection persisted,demonstrating the destabilizing effects of ECD on the *** pathways for cell membrane synthesis and organic compound degradation were enriched after *** reaction of the microbiome after ECD was similar to other disinfection techniques in terms of community structure.

关键词： Electrochemical disinfection Secondary effluent Microbiome

Insights on advanced substrates for controllable fabrication of photoanodes toward efficient and stable photoelectrochemical water splitting

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Carbon Energy 2024年第4期6卷 164-221页

作者： Huilin Hou Gang Shao Yang Wang Wai‐yeung Wong Weiyou Yang Institute of Micro/Nano Materials and Devices Ningbo University of TechnologyNingboChina School of Materials Science and Engineering Zhengzhou UniversityZhengzhouChina Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy The Hong Kong Polytechnic UniversityHong KongChina

Conversion of solar energy into H_(2) by photoelectrochemical(PEC)water splitting is recognized as an ideal way to address the growing energy crisis and environmental *** a typical PEC cell,the construction of photoanodes is crucial to guarantee the high efficiency and stability of PEC reactions,which fundamentally rely on rationally designed semiconductors(as the active materials)and substrates(as the current collectors).In this review work,we start with a brief introduction of the roles of substrates in the PEC ***,we provide a systematic overview of representative strategies for the controlled fabrication of photoanodes on rationally designed substrates,including conductive glass,metal,sapphire,silicon,silicon carbide,and flexible ***,some prospects concerning the challenges and research directions in this area are proposed.

关键词： hydrogen photoanode photoelectrochemical substrates water splitting

A Dynamic Network Game of the Fintech Industry

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Journal of the Operations Research Society of China 2024年第1期12卷 5-33页

作者： David W.K.yeung Leon A.Petrosyan Ying-Xuan Zhang SRS Consortium for Advanced Study in Cooperative Dynamic Games Shue Yan UniversityHong KongChina Center of Game Theory St Petersburg State UniversitySaint PetersburgRussia Department of Finance Asia UniversityTaichung CityTaiwanChina Faculty of Applied Mathematics-Control Processes and Center of Game Theory St Petersburg StateUniversitySaint PetersburgRussia

Economies of scale,economies of scope,and technology spillover are decisive eco-nomic elements that are crucial to the development in the Fintech *** externalities are often realized through network *** this paper,we presenta dynamic network ofﬁnancialﬁrms which exhibits these decisive *** game equilibria are characterized.A Pareto efﬁcient solution involving col-laboration of allﬁrms is *** obtain a fair-share distribution of cooperativegains,the Shapley value is adopted as the sharing *** distributionmechanisms which guarantee the fulﬁlment of the Shapley value distribution in eachstage of the cooperation duration are derived.

关键词： Network game Network equilibria Shapley value Pareto efﬁcientcooperation

Non-UV germicidal activity of fresh TiO_2 and Ag/TiO_2

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Journal of Environmental Sciences 2009年第5期21卷 700-706页

作者： LIU Lifen John Barford yeung king lun Key Laboratory of Industrial Ecology and Environmental Engineering Ministry of Education of China School of Environmental and Biological Science & Technology Dalian University of Technology Dalian 116024 China Department of Chemical Engineering Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong 999077 China

Fresh TiO2 was found to possess a strong germicidal activity even without UV irradiation. Live Yeast （Saccharomyces cerevisiae） cells in contact with fresh TiO2 were found deformed and dead after 15min contact. The cause of germicidal activity was discussed from the observed cell deformation, lysis and increased absorption at 1680 cm^-1 in FT-IR spectra of the affected cells, which proved the oxidizing effect of fresh TiO2 to cells. The deformation caused by the stretching of cell wail and pressure built-up inside the cell, led to cell burst and release of intracellular materials. The degree of cell deformation was found positively related with the wetting property of TiO2. Cells are negatively charged, for Gram-negative cell （thinner ceil wail）, a higher germicidal effect was observed than Gram-positive cells. The germicidal effect of TiO2 gradually decreased after exposure to air at room temperature, as the wetting property decreased. This kind of germicidal activity was more effective compared to other germicidal process such as UVA/TiO2 or Ag＋. This shed light on designing new germicidal material either maintained by visible light irradiation, or by oxidation effect generated by reactive oxygen species.

关键词： germicidal activity titanium dioxide non-UV