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Microwave-assisted pyrolysis of plastics for aviation oil production:energy and economic analyses

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Frontiers of Chemical Science and Engineering 2024年第7期18卷 141-153页

作者： Sichen Fan Yifan Liu Yaning Zhang Wenke Zhao Chunbao Xu School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of Energy and Environment City University of Hong KongHong Kong SARChina

Microwave-assisted pyrolysis is an effective method for recycling plastic wastes into oils that can be used for aviation fuels. In this study, energy and economic analyses of aviation oil production from microwave-assisted pyrolysis of polystyrene were performed. The total energy efficiency, recovered energy efficiency, unitary cost, unitary energy economic cost, relative cost difference, and energy economic factor were detailed. And the effects of microwave power, pyrolysis temperature, microwave absorbent loading, and microwave absorbent type on these parameters were covered. It was found that pyrolysis temperature has the most significant effect on the unitary cost and unitary energy economic cost of aviation oil, and-microwave absorbent type has a significant influence on energy economic factor during the whole microwave-assisted pyrolysis process. The optimum reaction conditions at the tonnage system for pyrolysis of 1 t polystyrene were microwave power of 650 W, pyrolysis temperature of 460 ℃, and silicon carbide (microwave absorbent) at a loading of 2 t (twice than feedstock loading). At these optimal conditions, the total energy efficiency, recovered energy efficiency, unitary cost, unitary energy economic cost, relative cost difference, and energy economic factor were 62.78%, 96.51%, 3.21 × 10^(4) yuan·t^(-1), 779 yuan·GJ^(-1), 1.49, and 71.02%, respectively.

关键词： energy analysis economic analysis microwave-assisted pyrolysis polystyrene aviation oil

Modelling the water diversion of a sustainable cover system under humid climates

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第7期16卷 2429-2440页

作者： Haowen Guo Charles Wang Wai Ng Qi Zhang Chuanxiang Qu Liwen Hu Shenzhen Research institute of hong kong University of Science and Technology Shenzhen518057China Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyHong Kong SAR999077China CCCC Fourth Harbor Engineering institute Co. LtdGuangzhou510230China

Extreme rainfall significantly threatens the safety of the landfill cover system,especially under humid *** study aims to provide design recommendations for a sustainable landfill cover system consisting of a low-permeability soil layer underlying a two-layer capillary barrier for humid ***,the numerical back-analysis was conducted for verification against a series of flume model ***,a parametric study was performed to investigate the effects of inclination angle,particle size and layer thickness on the lateral diversion length(DL)of the three-layer cover system under the 100-year return period rainfall of humid *** results show that the water lateral DL of the cover system can be greatly enhanced by increasing the inclination angle from 3°to 18°.Moreover,the bottom layer of the cover system with a coarser d10 was more susceptible to the impact of the heavy rainfall,while this can be alleviated by increasing the thickness of the bottom layer.A dimensionless number,defined as the ratio of thickness and d_(10) of the bottom layer,is proposed for designing lateral diversion of the three-layer cover system under humid *** preserve the maximum DL,it is suggested that the proposed dimensionless number should be larger than 95 and 110 for the design of rainfall events with 50-year and 100-year return periods for humid climates,respectively.

关键词： Unsaturated soil Recycling Construction waste Three-layer landfill cover Water infiltration

Controllable synthesis of one-dimensional silicon nanostructures based on the dual effects of electro-deoxidation and the Kirkendall effect

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Nano Research 2024年第9期17卷 7814-7823页

作者： Jianxin Tu Shuo Yu Kui Hao Le Sun Ruicheng Bai Fangzhou Zhang Aijun Li hong Liu institute of Materials School of Materials Science and EngineeringShanghai UniversityShanghai 200444China Department of Applied Physics The Hong Kong Polytechnic UniversityKowloon 999077Hong KongChina Shaoxing institute of technology Shanghai UniversityShanghai 200444China

In this study,we successfully synthesized silicon nanotubes(Si-NTs)and silicon nanowires(Si-NWs)in a controllable manner using a catalyst-and template-free method through the direct electrolysis of SiO_(2)in a molten CaCl_(2)-CaO system,while also proposing a novel formation mechanism for ***-NWs are formed through electro-deoxidation when the cell voltage is within the range of CaO decomposition voltage and SiO_(2)decomposition *** subsequently adjusting the voltage to a value between the decomposition potentials of CaCl_(2)and CaO,in-situ electro-deoxidation of CaO takes place on the surface of the synthesized Si-NWs,leading to the formation of a Ca *** formation of Ca-Si diffusion couple leads to the creation of vacancies within the Si-NWs,as the outward diffusion rate of Si exceeds the inward diffusion rate of *** differential diffusion rates between Si and Ca in a diffusion couple exhibit an analogy to the Kirkendall *** vacancies gradually accumulate and merge,forming large voids,which ultimately result in the formation of hollow *** a subsequent dealloying process,the removal of the embedded calcium leads to the formation of *** the application of a carbon coating,the Si-NTs@C composite showcases a high initial discharge capacity of 3211 mAh·g^(-1)at 1.5 A·g^(-1)and exhibits exceptional long-term cycling stability,maintaining a capacity of 977 mAh·g^(-1)after 2000 cycles at 3.0 A·g^(-1).

关键词： silicon nanotubes silicon nanowires lithium-ion battery Kirkendall effect

Heat source recognition sensor mimicking the thermosensation function of human skin

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The Innovation 2024年第5期5卷 84-90,83页

作者： Wenting Sun Pengxiang Zhang Xinyi Lin Yupeng Wang Shuaihua Wang Bin Yang Zijian Zheng Weishu Liu Department of Materials Science and Engineering Southern University and Science and TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices Southern University of Science and TechnologyShenzhen 518055China School of Fashion and Textiles The Hong Kong Polytechnic UniversityHong Kong SARChina Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHong Kong SAR 999077China Research institute for Intelligent Wearable Systems(RI-IWEAR) The Hong Kong Polytechnic UniversityHong Kong SAR 999077China Research institute for Smart Energy(RISE) The Hong Kong Polytechnic UniversityHong Kong SAR 999077China

The human skin maintains a comfortable and healthy somatosensory state by sensing different aspects of the thermal environment,including temperature value,heat source,energy level,and ***,state-of-the-art thermosensors only measure basic temperature values,not the full range of the thermosensation function of human ***,we propose a heat source recognition(hsr)sensor of poly(butyl acrylate)-lithium bis(n-fluoroalkylsulfonyl)imide(PBA-Li:nFSI;n=1,3,5),which enables response to temperature,pressure,and proximity stimulus signals based on the relaxation behavior of the ionic gel and distinguished between different types of heat sources(i.e.,radiation,convection,and conduction).The hsr sensor was integrated into a prosthetic limb covered by an e-skin with isothermal regulation,and experiments with a robot showed that it could achieve human-like thermosensation function,recognizing multidimensional information about thermal environments,such as temperature value,comfort level,and heat source *** work deeply mimics the human body’s thermosensation function and provides a reliable solution for the development of bionic e-skin for intelligent robots and prosthetics.

关键词： robot function source

Leveraging the Qianhai Shenzhen-hong kong China Modern Service Industry Cooperation Zone for the Advancement of hong kong China as An International financial Center

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China Forex 2024年第2期 56-60页

作者： YING Jian hong kong financial Research institute of Bank of China

To accelerate the construction of a world-class international financial centerin China's hong kong China(hereinafter referred to as hong kong China),it is necessary to fully utilize various favorable conditions and mobilize all available resources,including leveraging strong support from key regions in the Chinese mainland and enhancing both internal and external linkages with these areas.

关键词： financial aging utilize

Tailoring the microstructure of Mg-Al-Sn-RE alloy via friction stir processing and the impact on its electrochemical discharge behaviour as the anode for Mg-air battery

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Journal of Magnesium and Alloys 2024年第4期12卷 1554-1565页

作者： Jingjing Liu Hao Hu Tianqi Wu Jinpeng Chen Xusheng Yang Naiguang Wang Zhicong Shi School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006China Hunan institute of Metrology and Test Changsha 410014China Department of Industrial and Systems Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

Constructing the magnesium alloy with fine grains,low density of dislocations,and weak crystal orientation is of crucial importance to enhance its comprehensive performance as the anode for Mg-air ***,this unique microstructure can hardly be achieved with conventional plastic deformation such as rolling or ***,we tailor the microstructure of Mg-Al-Sn-RE alloy by using the friction stir processing,which obviously refines the grains without increasing dislocation density or strengthening crystal *** Mg-air battery with the processed Mg-Al-Sn-RE alloy as the anode exhibits higher discharge voltages and capacities than that employing the untreated ***,the impact of friction stir processing on the electrochemical discharge behaviour of Mg-Al-Sn-RE anode and the corresponding mechanism are also analysed according to microstructure characterization and electrochemical response.

关键词： Magnesium anode Electrochemical discharge behaviour Mg-air battery Friction stir processing

Development of biomedical hydrogels for rheumatoid arthritis treatment

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Asian Journal of Pharmaceutical Sciences 2024年第1期19卷 35-48页

作者： Mirza Muhammad Faran Ashraf Baig Lee KiWong Abdul Wasy Zia hongkai Wu Department of Chemistry Hong Kong University of Science and TechnologyHong Kong 999077China institute of Mechanical Process and Energy Engineering(IMPEE)School of Engineering and Physical SciencesHeriot-Watt UniversityEdinburghUnited Kingdom

Rheumatoid Arthritis(RA)is an autoimmune disorder that hinders the normal functioning of bones and joints and reduces the quality of human *** year,millions of people are diagnosed with RA worldwide,particularly among elderly individuals and ***,there is a global need to develop new biomaterials,medicines and therapeutic methods for treating *** will improve the Healthcare Access and Quality Index and also relieve administrative and financial burdens on healthcare service providers at a global *** are soft and cross-linked polymeric materials that can store a chunk of fluids,drugs and biomolecules for hydration and therapeutic *** are biocompatible and exhibit excellent mechanical properties,such as providing elastic cushions to articulating joints by mimicking the natural synovial ***,hydrogels create a natural biological environment within the synovial cavity to reduce autoimmune reactions and *** also lubricate the articulating joint surfaces to prevent degradation of synovial surfaces of bones and cartilage,thus exhibiting high potential for treating *** work reviews the progress in injectable and implantable hydrogels,synthesis methods,types of drugs,advantages and ***,it discusses the role of hydrogels in targeted drug delivery,mechanistic behaviour and tribological performance for RA treatment.

关键词： Rheumatoid arthritis Orthopeadic joints Hydrogel Therapeutics Mechanical properties Medicine

Regulating the dopant clustering in LiZnAs-based diluted magnetic semiconductor

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Chinese Physics B 2024年第5期33卷 617-623页

作者：贾子航周波姜振益张小东 institute of Modern Physics Northwest UniversityXi'an 710069China Shaanxi Key Laboratory for Theoretical Physics Frontiers Northwest UniversityXi'an 710069China Department of Physics Chinese University of Hong KongHong Kong SARChina Beijing Computational Science Research Center Beijing 100193China

Tuning of the magnetic interaction plays the vital role in reducing the clustering of magnetic dopant in diluted magnetic semiconductors(DMS).Due to the not well understood magnetic mechanism and the interplay between different magnetic mechanisms,no efficient and universal tuning strategy is proposed at ***,the magnetic interactions and formation energies of isovalent-doped(Mn) and aliovalent(Cr)-doped LiZnAs are studied based on density functional theory(DFT).It is found that the dopant–dopant distance-dependent magnetic interaction is highly sensitive to the carrier concentration and carrier type and can only be explained by the interplay between two magnetic mechanisms,i.e.,superexchange and Zener’s p–d exchange ***,the magnetic behavior and clustering of magnetic dopant can be tuned by the interplay between two magnetic *** insensitivity of the tuning effect to U parameter suggests that our strategy could be universal to other DMS.

关键词： diluted magnetic semiconductor dopant distribution first-principles calculations

Privacy-preserving human activity sensing:A survey

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High-Confidence Computing 2024年第1期4卷 108-117页

作者： Yanni Yang Pengfei Hu Jiaxing Shen Haiming Cheng Zhenlin An Xiulong Liu School of Computer Science and Technology Shandong UniversityQingdao 266237China Department of Computing and Decision Sciences Lingnan UniversityHong KongChina Department of Computing The Hong Kong Polytechnic UniversityHong KongChina Department of Computer Science Princeton UniversityNJ 08544USA College of Intelligence and Computing Tianjin UniversityTianjin 300350China

With the prevalence of various sensors and smart devices in people’s daily lives,numerous types of information are being *** using such information provides critical and convenient services,we are gradually exposing every piece of our behavior and *** are aware of the privacy risks and have been working on preserving privacy while sensing human *** survey reviews existing studies on privacy-preserving human activity *** first introduce the sensors and captured private information related to human *** then propose a taxonomy to structure the methods for preserving private information from two aspects:individual and collaborative activity *** each of the two aspects,the methods are classified into three levels:signal,algorithm,and ***,we discuss the open challenges and provide future directions.

关键词： Human activity sensing Privacy-preserving sensing Activity sensing algorithms Human sensors Privacy protection