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Institution

Hong Kong Polytechnic University

EducationHong Kong, China
About: Hong Kong Polytechnic University is a education organization based out in Hong Kong, China. It is known for research contribution in the topics: Tourism & Population. The organization has 29633 authors who have published 72136 publications receiving 1956312 citations. The organization is also known as: HKPU & PolyU.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the use of ferrites in photocatalytic conversion of visible solar energy to generate e − /h +, which in turn produce reactive oxygen species through redox processes, for the degradation of the contaminants.

625 citations

Journal ArticleDOI
TL;DR: In this article, the authors examined 9 different practices and proposed a comparative basis, namely, International Urban Sustainability Indicators List (IUSIL), for allowing the better understanding of drivers and goals of each practice and identifying under what circumstances various practices selected their indicators.

625 citations

Journal ArticleDOI
26 Jun 2014-Nature
TL;DR: It is shown that SWNTs of a single chirality, (12, 6), can be produced directly with an abundance higher than 92 per cent when using tungsten-based bimetallic alloy nanocrystals as catalysts, unlike other catalysts used so far, which have such high melting points that they maintain their crystalline structure during the chemical vapour deposition process.
Abstract: Single-walled carbon nanotubes of a single chirality can be produced with an abundance of more than 92 per cent when using tungsten-based bimetallic alloy nanocrystals as catalysts. Single-walled carbon nanotubes (SWNTs) have many outstanding material properties that depend sensitively on their exact structure. This structure–function relationship can be fully exploited only with access to structurally pure SWNTs, but producing just one tube type remains a considerable challenge. Here Feng Yang et al. describe a strategy to realize chirality-specific growth of a single SWNT type using solid tungsten–cobalt alloy nanoparticles as catalysts. The tungsten component ensures high-temperature stability for the catalyst structure and cobalt is an effective catalyst. Optimization of the strategy should boost selectivity further, to deliver structurally pure SWNT samples that may enable wider use and development of these unique materials for practical applications. Carbon nanotubes have many material properties that make them attractive for applications1,2. In the context of nanoelectronics3, interest has focused on single-walled carbon nanotubes4 (SWNTs) because slight changes in tube diameter and wrapping angle, defined by the chirality indices (n, m), will shift their electrical conductivity from one characteristic of a metallic state to one characteristic of a semiconducting state, and will also change the bandgap. However, this structure–function relationship can be fully exploited only with structurally pure SWNTs. Solution-based separation methods5 yield tubes within a narrow structure range, but the ultimate goal of producing just one type of SWNT by controlling its structure during growth has proved to be a considerable challenge over the last two decades6,7,8,9. Such efforts aim to optimize the composition6,10,11,12,13,14,15,16,17 or shape18,19,20,21 of the catalyst particles that are used in the chemical vapour deposition synthesis process to decompose the carbon feedstock and influence SWNT nucleation and growth22,23,24,25. This approach resulted in the highest reported proportion, 55 per cent, of single-chirality SWNTs in an as-grown sample11. Here we show that SWNTs of a single chirality, (12, 6), can be produced directly with an abundance higher than 92 per cent when using tungsten-based bimetallic alloy nanocrystals as catalysts. These, unlike other catalysts used so far, have such high melting points that they maintain their crystalline structure during the chemical vapour deposition process. This feature seems crucial because experiment and simulation both suggest that the highly selective growth of (12, 6) SWNTs is the result of a good structural match between the carbon atom arrangement around the nanotube circumference and the arrangement of the catalytically active atoms in one of the planes of the nanocrystal catalyst. We anticipate that using high-melting-point alloy nanocrystals with optimized structures as catalysts paves the way for total chirality control in SWNT growth and will thus promote the development of SWNT applications.

620 citations

Journal ArticleDOI
TL;DR: Recent advances in asymmetric organocatalysis are summarized and classified according to the spiro ring fused at the 3-position of the oxindole core.
Abstract: The asymmetric organocatalysis is definitely one of the most powerful and versatile tools for the rapid construction of various spirocyclic oxindoles. In the past few years, a number of successful strategies based on organocatalysis have been developed for the construction of 3,3′-spirocyclic oxindoles in high yields and excellent enantioselectivities under mild conditions. In this review, recent advances in this area are summarized and classified according to the spiro ring fused at the 3-position of the oxindole core.

620 citations

Journal ArticleDOI
TL;DR: This study illustrates the benefits of supply chain partnerships based on information sharing and shows that increasing information sharing among the members in a decentralized supply chain will lead to Pareto improvement in the performance of the entire chain.
Abstract: The power of information technology can be harnessed to help supply chain members establish partnerships for better supply chain system performance. Supply chain partnerships can mitigate deficiencies associated with decentralized control and reduce the “bullwhip effect”. This study illustrates the benefits of supply chain partnerships based on information sharing. For a decentralized supply chain comprising a manufacturer and a retailer, we derive the members’ optimal inventory policies under different information sharing scenarios. We show that increasing information sharing among the members in a decentralized supply chain will lead to Pareto improvement in the performance of the entire chain. Specifically, the supply chain members can reap benefits in terms of reductions in inventory levels and cost savings from forming partnerships with one another. A case study is provided for illustration.

620 citations


Authors

Showing all 30115 results

NameH-indexPapersCitations
Jing Wang1844046202769
Xiang Zhang1541733117576
Wei Zheng1511929120209
Rui Zhang1512625107917
Jian Yang1421818111166
Joseph Lau140104899305
Yu Huang136149289209
Dacheng Tao133136268263
Chuan He13058466438
Lei Zhang130231286950
Ming-Hsuan Yang12763575091
Chao Zhang127311984711
Yuri S. Kivshar126184579415
Bin Wang126222674364
Chi-Ming Che121130562800
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20241
2023229
2022971
20216,743
20206,207
20195,288