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Nanoimprint lithography-assisted block copolymer self-assembly for hyperfine fabrication of magnetic patterns based on l10-FePt nanoparticles

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Science China Chemistry 2025年

作者： Jie Zhang Yi Chen Guijun li Zelin Sun Zhengong Meng Wai-yeung Wong Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy The Hong Kong Polytechnic University The Hong kong Polytechnic University Shenzhen Research Institute Division of Integrative Systems and Design and Department of Electronic and Computer Engineering The Hong Kong University of Science and Technology School of Flexible Electronics (Future Technology) and Institute of Advanced Materials (IAM) Nanjing Tech University

l10-FePt-type bit-patterned media has provided a promising alternative for ultrahigh-density magnetic recording systems in the current digital era, but rapid fabrication of magnetic patterns with hyperfine bit islands is still challenging, especially with the target for miniaturization and scalable production simultaneously. Herein, Fe,Pt-containing block copolymers were utilized as single-source precursors for solution-processable patterning and subsequent generation of the demanding magnetic FePt dots by in situ pyrolysis. High-throughput nanoimprint lithography was initially employed to fabricate the predefined bit cells precisely,and then the intrinsic self-assembly of phase-separated block copolymers further drove the formation of accurate bit *** from the synergistic effect of top-down lithographic approach and bottom-up self-assembly, the customizable patterns could be achieved for large-scale mass production in targeted areas, but high-density isolated dots could also be accurately aligned along the patterned features after subsequent self-assembly. This reliable strategy would provide a good avenue to precisely construct ultrahigh-density magnetic data storage devices.

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Engineered polycaprolactone–magnesium hybrid biodegradable porous scaffold for bone tissue engineering

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Progress in Natural Science:Materials International 2014年第5期24卷 561-567页

作者： Hoi Man Wong Paul k.Chu Frankie k.l.leung kenneth M.C.Cheung keith D.k.luk kelvin W.k.yeung Department of Orthopaedics and Traumatology The University of Hong Kong Shenzhen key laboratory for Innovative Technology in Orthopaedic Trauma The University of Hong Kong Shenzhen Hospital Department of Physics and Materials Science City University of Hong Kong Peking University Shenzhen Institution

In this paper, we describe the fabrication of a new biodegradable porous scaffold composed of polycaprolactone(PCl) and magnesium(Mg)micro-particles. The compressive modulus of PCl porous scaffold was increased to at least 150% by incorporating 29% Mg particles with the porosity of 74% using Micro-CT analysis. Surprisingly, the compressive modulus of this scaffold was further increased to at least 236% when the silane-coupled Mg particles were added. In terms of cell viability, the scaffold modified with Mg particles significantly convinced the attachment and growth of osteoblasts as compared with the pure PCl scaffold. In addition, the hybrid scaffold was able to attract the formation of apatite layer over its surface after 7 days of immersion in normal culture medium, whereas it was not observed on the pure PCl scaffold. This in vitro result indicated the enhanced bioactivity of the modified scaffold. Moreover, enhanced bone forming ability was also observed in the rat model after 3 months of implantation. Though bony in-growth was found in all the implanted scaffolds. High volume of new bone formation could be found in the Mg/PCl hybrid scaffolds when compared to the pure PCl scaffold. Both pure PCl and Mg/PCl hybrid scaffolds were degraded after 3 months. However, no tissue inflammation was observed. In conclusion, these promising results suggested that the incorporation of Mg micro-particles into PCl porous scaffold could significantly enhance its mechanical and biological properties. This modified porous bio-scaffold may potentially apply in the surgical management of large bone defect fixation.

关键词： Magnesium Polycaprolactone Biodegradability Biocompatibility Mechanical properties

Enhanced electrokinetic remediation of cadmium-contaminated natural clay using organophosphonates in comparison with EDTA

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Chinese Journal of Chemical Engineering 2018年第5期26卷 1152-1159页

作者： Yingying Gu Albert T. yeung Hongjiang li Department of Environmental and Safety Engineering China University of Petroleum (East China) Qingdao 266580 China Department of Engineering The University of Hong kong Pokfulam Road Hong Kong China Qingdao Water Group Co. ltd. Qingdao 266002 China College of Mining Civil Engineering Taiyuan University of Technology Taiyuan 030024 China

Soil contamination by metals is a worldwide environmental problem. Electrokinetic extraction is a promising technology for in-situ remediation of contaminated soils of low hydraulic permeability. However, the extraction of metals is usually hindered by the high buffer capacity of natural soils. Organophosphonates are strong metal chelates as ethylenediaminetetraacetic acid(EDTA) which has been widely studied in the enhancement of electrokinetic remediation. In this study, batch desorption experiments and bench-scale electrokinetic extraction experiments were carried out to study the effect of two organophosphonates, i.e.,(nitrilotrimethylene)triphosphonate(NTMP) &(ethylenedinitrilo)-tetramethylenephosphonate(EDTMP), on the extraction of cadmium from a natural clay in comparison with EDTA. Results of the batch desorption experiments showed that more than 75% of the sorbed cadmium could be dissolved into solution using 0.1 mol·l^(-1) organophosphonates or EDTA in the wide p H range of 1–11. Results of the electrokinetic extraction experiments showed that the cadmium spiked in the specimen migrated towards the anode with the enhancement of NTMP,EDTMP, and EDTA under a constant voltage gradient of approximately 1.0 V·cm-1. Although cadmium mobilization enhanced by EDTA was more efficient than that by the organophosphonates, accumulation of cadmium was observed in the vicinity of the anode. The average removal efficiencies of cadmium from the soil after approximately 5 days of electrokinetic extraction enhanced by 0.1 mol·l-1 NTMP(22.8%) and EDTMP(22.4%) were higher than that by 0.1 mol·l^(-1) EDTA(15.1%).

关键词： Electrochemistry Remediation Desorption Organophosphonate EDTA High buffer capacity

Male Advertisement Call of the Endangered leptobrachella tengchongensis(Anura: Megophryidae) from Mount Gaoligongshan, Yunnan Province, China

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Asian Herpetological Research 2021年第2期12卷 221-227页

作者： Ho Yuen yeung Xiangyuan HUANG Shenpin YANG Jianhuan YANG kadcxfrie Conservation China Department Kcuioorie Farm and Botanic GardenLam Kam RoadTai PoN.T.Hong KongChina Gaoligongshan National Nature Reserve(Tengchong Bureau) Tengchong 679100YunnanChina

We present the first description of the acoustic characters of the endangered Tengchong leaf litter toad(leptobrachella tengchongensis), aiming to inform future ecological studies of the species and taxonomic studies in the genus leptobrachella. A total of 1179 calls, belonging to 6 adults male individuals, were recorded using TASCAM DR-40 digital sound recorder from its type locality in May 2015 and then analyzed using Raven Pro v.1.6.1 software. The advertisement call of male l. tengchongensis consists of primary advertisement call and secondary advertisement call. The primary advertisement call is invariably composed of two notes and has a call duration of 61 ± 5 ms(23–87 ms, n = 1142). The secondary advertisement call is composed of 3–10 notes(mean 5.25 ± 1.41 notes/call, n = 37) with a call duration of 90 ± 6 ms(37–127 ms, n = 37). The mean inter-call interval is 212 ± 121 ms(88–1121 ms, n = 1092). An introductory note is absent in advertisement calls and the dominant of calls is 4.1–4.8 kHz(at 20 ℃). We discuss the interspecific and intraspecific variations on advertisement calls in l. tengchongensis and among leptobrachella species, and provide a summary on the major acoustic characters of all leptobrachella species occurring north of the Isthmus of kra.

关键词： acoustic analysis amphibians bioacoustics breeding ecology leptolalax taxonomy Tengchong

Common endocrine and metabolic disorders among the Chinese in Hong kong

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Chinese Medical Journal 1997年第6期110卷 27-32页

作者： R.T.T.yeung 杨紫芝 k.S.l.lam 林小玲 Department of Medicine University of Hong Kong Queen Mary Hospital Hong Kong.

ＣｏｍｍｏｎｅｎｄｏｃｒｉｎｅａｎｄｍｅｔａｂｏｌｉｃｄｉｓｏｒｄｅｒｓａｍｏｎｇｔｈｅＣｈｉｎｅｓｅｉｎＨｏｎｇＫｏｎｇＲ．Ｔ．Ｔ．Ｙｅｕｎｇ杨紫芝ａｎｄＫ．Ｓ．Ｌ．Ｌａｍ林小玲ｎｔｈｉｓｒｅｖｉｅｗ，ｗｅｈａｖｅ... 详细信息

ＣｏｍｍｏｎｅｎｄｏｃｒｉｎｅａｎｄｍｅｔａｂｏｌｉｃｄｉｓｏｒｄｅｒｓａｍｏｎｇｔｈｅＣｈｉｎｅｓｅｉｎＨｏｎｇＫｏｎｇＲ．Ｔ．Ｔ．Ｙｅｕｎｇ杨紫芝ａｎｄＫ．Ｓ．Ｌ．Ｌａｍ林小玲ｎｔｈｉｓｒｅｖｉｅｗ，ｗｅｈａｖｅａｔｅｍｐｔｅｄｔｏｈｉｇｈｌｉｇ...

关键词：紫芝 disorders metabolic the and endocrine Hong kong Common Chinese

Sorption of Perfluorooctane sulfonate(PFOS) including its isomers on hydrargillite as a function of pH,humic substances and Na2SO4

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Journal of Environmental Sciences 2022年第1期34卷 263-272页

作者： Jean-Noel Uwayezu leo W.Y.yeung Mattias Bäckström Man-Technology-Environment Research Centre(MTM) Örebro University70182ÖrebroSweden

Perfluorooctane sulfonate(PFOS)is a persistent organic pollutant(POP)and emergent contaminant that are widespread in the *** the mechanisms controlling the distribution of PFOS and its isomers between hydrargillite and the water phase is important in order to study their redistribution and mobility in the *** study investigated the effects of pH,humic acid,fulvic acid and Na_(2)SO_(4) on sorption of PFOS isomers to hydrargillite.A mixture of PFOS isomers was spiked into water and hydrargillite was added to the system and shaken for one day;the system was tested with different aqueous *** of PFOS isomers in the aqueous phase were quantified using an ultra-performance liquid chromatograph coupled to a triple quadrupole mass *** results showed that the distribution coefficients of PFOS isomers were found to be 0.76,0.71,0.93 and 0.90 at pH 6.5,for 3-/4-/5-PFOS,6-/2-PFOS,l-PFOS and total PFOS *** distribution coefficients increased at lower pH and decreased at alkaline *** presence of humic substances(HS)increased the sorption slightly at the environmental pH of 6.5,although a competition effect was observed during acidic conditions.A tendency of PFOS distribution to hydrargillite in the presence of Na_(2)SO_(4) was like its behavior in the presence of HS although the mechanisms behind the sorption were interpreted *** study revealed that l-PFOS was readily sorbed when no other chemicals were added or in 20 mg/l FA or 100 mg/l Na_(2)SO_(4).We suggest that an increase in PFOS sorption in the presence of HS may be due to hydrophobic mechanisms while Na_(2)SO_(4) contributed to increased sorption through ionic strength effects.

关键词： Hydrargillite Perfluorooctane sulfonate Sorption Humic substances Electrostatic,Ionic strength

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镁合金废料的回收

铸造技术 2007年第B07期28卷 27-32页

作者：王云陈敏强杨利坚龙思远香港生产力促进局材料科技部重庆大学机械工程学院

在镁合金零部件生产过程中,特别是在压力铸造生产中,产生出来的废料以及使用后报废的镁合金零件逐渐增多。出于成本和环境因素的考虑,必须对这与日俱增的镁合金废料进行有效回收。本文以生产占90%的镁合金零部件压力铸造为主线,介绍镁... 详细信息

在镁合金零部件生产过程中,特别是在压力铸造生产中,产生出来的废料以及使用后报废的镁合金零件逐渐增多。出于成本和环境因素的考虑,必须对这与日俱增的镁合金废料进行有效回收。本文以生产占90%的镁合金零部件压力铸造为主线,介绍镁合金废料回收的经济分析,镁合金废料的来源和分类、现行回收技术的现状及发展趋势。并介绍香港生产力促进局和重庆硕龙科技公司最近研究开发的一种新型镁合金废料现场精炼回收系统。

关键词：镁合金压铸废料回收

Breast Cancer Induced Bone Osteolysis Prediction Using Temporal Variational Autoencoders

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Biomedical Engineering Frontiers 2022年第1期3卷 116-125页

作者： Wei Xiong Neil yeung Shubo Wang Haofu liao liyun Wang Jiebo luo Department of Computer Science University of RochesterRochesterUSA Department of Mechanical Engineering University of DelawareUSA Amazon Web Services USA

Objective and Impact *** adopt a deep learning model for bone osteolysis prediction on computed tomography(CT)images of murine breast cancer bone *** the bone CT scans at previous time steps,the model incorporates the bone-cancer interactions learned from the sequential images and generates future CT *** ability of predicting the development of bone lesions in cancer-invading bones can assist in assessing the risk of impending fractures and choosing proper treatments in breast cancer bone *** cancer often metastasizes to bone,causes osteolytic lesions,and results in skeletal-related events(SREs)including severe pain and even fatal *** current imaging techniques can detect macroscopic bone lesions,predicting the occurrence and progression of bone lesions remains a *** adopt a temporal variational autoencoder(T-VAE)model that utilizes a combination of variational autoencoders and long short-term memory networks to predict bone lesion emergence on our micro-CT dataset containing sequential images of murine *** the CT scans of murine tibiae at early weeks,our model can learn the distribution of their future states from *** test our model against other deep learning-based prediction models on the bone lesion progression prediction *** model produces much more accurate predictions than existing models under various evaluation *** develop a deep learning framework that can accurately predict and visualize the progression of osteolytic bone *** will assist in planning and evaluating treatment strategies to prevent SREs in breast cancer patients.

关键词： Breast prediction utilize

Study of Adaptive Clothing in Hong kong: Demands, Analysis and Future Direction

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Advances in Aging Research 2020年第1期9卷 1-13页

作者： Jeffrey yeung Patrick C. l. Hui Institute of Textiles and Clothing The Hong Kong Polytechnic University Hong Kong China

Aging population is substantively increased over last decade and they have specific clothing needs especially for the elderly with disabilities. Their clothing needs to cover functional and aesthetic requirements in order to improve their quality of life. Adaptive clothing is specially designed for the elderly and the disabled. However, there is no public policy to support such the elderly with disabilities in their clothing needs. In this paper, we aim to study the adaptive clothing and its significance, the problems encountered by the elderly with disabilities in adaptive clothing, analysis of public policy in Hong kong for the elderly with disabilities in adaptive clothing over last decade, and implications and future directions for adaptive clothing in Hong kong. In our findings, the demand of adaptive clothing in Hong kong was substantially increased over last decade and the predicted demand will be twice of current demand after 50 years. However, the Government policy in Hong kong has not yet fully supported their clothing needs, and the non-profit clothing services centre is set up to provide tailoring services to meet their needs. As the capacity of the centre is very limited, it is necessary to expand its capacity through assistive technology and to encourage non-government organizations (NGOs) to establish more social enterprises with Government’s support. Such findings would be beneficial to the Government for strengthening such services for the elderly and the disabled as well as public awareness.

关键词： Adaptive Clothing Elderly with Disabilities Public Policy