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RISS 인기검색어
- 검색키워드
- 저자 : Cheng Heng Pang (검색결과 3 건)
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The evolved kurtogram: a novel repetitive transients extraction method for bearing fault diagnosis
Bin Pang,Yuzhi Hu,Heng Zhang,Bocheng Wang,Tianshi Cheng,Zhenli Xu 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.12
Kurtogram, a classic repetitive transients extraction method, plays an important role in bearing fault diagnosis. However, its performance is unstable since its index used for optimal sub-band component selection is sensitive to random pulse. Moreover, its sub-band component extraction is characterized by over-decomposition and under-decomposition defects. In this paper, an evolved Kurtogram (Evkurtogram) is proposed by designing a new index called the Gaussian distribution assigned Gini index (GDAG) for optimal sub-band component identification. In addition, a multi-scale empirical Fourier decomposition (MSEFD) for signal separation is proposed. GDAG is more suitable for quantifying the fault features of the signal due to its robustness of accidental pulses. MSEFD can achieve multi-scale decomposition of the signal reasonably and adaptively. The proposed Evkurtogram is compared with some relevant state-of-art algorithms by processing simulated and experimental bearing fault signals. It is demonstrated that the proposed Evkurtogram is effective and superior when compared to other approaches.
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Jianchen Lai,Yang Meng,Yuxin Yan,Edward Lester,Tao Wu,Cheng Heng Pang 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.11
Catalytic pyrolysis offers a sustainable route to convert plastic wastes into fuel. We investigated the catalytic performance of coal ash (fly and bottom ash) at blending ratio of 5wt%, and 15wt% during pyrolysis of linear lowdensity polyethylene (LLDPE). The influence on activation energy and oil was characterized via thermogravimetric analyzer (TGA) and gas chromatography-mass spectrometry (GC-MS). Results have shown that 15 wt% bottom ash exhibited higher catalytic activity. The activation energy estimated by Coats-Redfern method decreased from 458.7 kJ·mol1 to 437.8 kJ·mol1, while the alicyclic hydrocarbon yield increased from 5.97% to 32.09%. This implies that CaO, which is abundant in bottom ash, could promote the conversion of LLDPE. Furthermore, a cradle-to-factory gate life cycle assessment was performed to investigate three scenarios (non-catalytic pyrolysis, 15 wt% fly ash, and 15 wt% bottom ash) of LLDPE conversion strategies via a normalization and weighting approach. It was found that LLDPE pyrolysis with 15 wt% bottom ash also showed the lowest normalized score of 2.83, implying the lowest environmental impact. This work has demonstrated that the recycling of coal ash, particularly bottom ash, as catalysts for LLDPE pyrolysis is effective.
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A recent trend: application of graphene in catalysis
Yuxin Yan,Woo In Shin,Hao Chen,Shar‑Mun Lee,Sivakumar Manickam,Svenja Hanson,Haitao Zhao,Edward Lester,Tao Wu,Cheng Heng Pang 한국탄소학회 2021 Carbon Letters Vol.31 No.2
Abstract Graphene, an allotrope of carbon in 2D structure, has revolutionised research, development and application in various disciplines since its successful isolation 16 years ago. The single layer of sp2-hybridised carbon atoms brings with it a string of unrivalled characteristics at a fraction of the price of its competitors, including platinum, gold and silver. More recently, there has been a growing trend in the application of graphene in catalysis, either as metal-free catalysts, composite catalysts or as catalyst supports. The unique and extraordinary properties of graphene have rendered it useful in increasing the reactivity and selectivity of some reactions. Owing to its large surface area, outstanding adsorptivity and high compatibility with various functional groups, graphene is able to provide a whole new level of possibilities and flexibilities to design and synthesise fit-for-purpose graphene-based catalysts for specific applications. This review is focussed on the progress, mechanisms and challenges of graphene application in four main reactions, i.e., oxygen reduction reaction, water splitting, water treatment and Fischer–Tropsch synthesis. This review also summarises the advantages and drawbacks of graphene over other commonly used catalysts. Given the inherent nature of graphene, coupled with its recent accelerated advancement in the synthesis and modification processes, it is anticipated that the application of graphene in catalysis will grow exponentially from its current stage of infancy.
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