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SSRN 2023年

作者： Li, Junfeng Zheng, Yunshan Hui, Kwan San Wang, Kaixi Zha, Chenyang Dinh, Duc Anh Tu, Jiguo Shao, Zongping Hui, Kwun Nam Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of Macau Avenida da Universidade Taipa China School of Engineering Faculty of Science University of East Anglia NorwichNR4 7TJ United Kingdom VKTech Research Center NTT Hi-Tech Institute Nguyen Tat Thanh University Ho Chi Minh City700000 Viet Nam State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Beijing100083 China State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University Nanjing211816 China

Polyanion-type cathode materials have the potential to provide high energy density and long cycling for next-generation potassium ion batteries (PIBs) due to their polyanionic inductive effect and structural stability. However, uncontrolled solid-state synthesis of these materials can lead to native impurity defects, resulting in degradation in the high-voltage operation and capacity drop upon cycling. Here, a carbothermal reduction approach and a stable electrode/electrolyte interface construction regulated by voltage are combined to ensure ultra-long cycling PIBs with the prepared pure-phase KVOPO4 materials. Such a desirable material features a stable 3D crystal framework and numerous K sites, facilitating efficient and sustained K+ diffusion during cycling. Therefore, the high reversibility of K ions storage enables a decent discharge capacity of ~63 mAh g−1 after 1000 cycles at C/2 and a low-capacity decay of about 0.013% per cycle. Structural characterization and theory calculation demonstrate the exceptional structure and robust electrode/electrolyte interface of KVOPO4, which successfully explains its cycling stability. Furthermore, the full cell using the commercial hard carbon delivers a specific capacity of 60 mAh g−1 at C/2 (based on the active mass of the cathode) after 700 cycles, thus accelerating the practical applications of KVOPO4 materials. © 2023, The Authors. All rights reserved.

关键词： Cathodes

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RETRACTION: Facile design of an ultra-thin broadband metamaterial absorber for C-band applications (Retraction of Vol 9, art no 468, 2019)

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SCIENTIFIC REPORTS 2021年第1期11卷 1-1页

作者： Nguyen Thi Quynh Hoa Tran Sy Tuan Lam Trung hieu Bach Long Giang School of Engineering and Technology Vinh University Vinh City Vietnam NTT Hi-Tech Institute Nguyen Tat Thanh University Ho Chi Minh City Vietnam

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Effects of Soft-Masking Function on Spectrogram-Based Instrument - Vocal Separation 16th

Effects of Soft-Masking Function on Spectrogram-Based Instru...

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16th International Conference of the Pacific Association for Computational Linguistics, PACLING 2019

作者： Tran, Duc Chung Ahamed Khan, M.K.A. Computing Fundamental Department and FPT Technology Research Institute FPT University Hoa Lac Hi-Tech Park Hanoi155300 Viet Nam Faculty of Engineering Technology and Built Environment UCSI University Kuala Lumpur Malaysia

ISBN: (纸本)9789811561672

This paper presents an analysis of effects of soft-masking function on spectrogram-based instrument - vocal separation for audio signals. The function taken into consideration is of 1st-order with two masking magnitude parameters: one for background and one foreground separation. It is found that as the masking magnitude increases, the signal estimations are improved. The background signal’s spectrogram becomes closer to that of the original signal while the foreground signal’s spectrogram represents better the vocal wiggle lines compared to the original signal spectrogram. With the same increase in the masking magnitude (up to ten-fold), the effect on background signal spectrogram is more significant compared to that of foreground signal. This is evident through the significant (≈ three times) reduction of background signal’s root-mean-square (RMS) values and the less significant reduction (approximately one-third) of foreground signal’s RMS values. © 2020, Springer Nature Singapore Pte Ltd.

关键词： Separation

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Recent advancements in modifications of metal–organic frameworks-based materials for enhanced water purification and contaminant detection

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Chemosphere 2024年 356卷 141972页

作者： Truong, Hai Bang Le, Van Nhieu Zafar, Muhammad Nadeem Rabani, Iqra Do, Ha Huu Nguyen, Xuan Cuong Hoang Bui, Vu Khac Hur, Jin Optical Materials Research Group Science and Technology Advanced Institute Van Lang University Ho Chi Minh City Viet Nam Faculty of Applied Technology School of Technology Van Lang University Ho Chi Minh City Viet Nam Faculty of Chemical Engineering Industrial University of Ho Chi Minh City Ho Chi Minh City70000 Viet Nam Department of Chemistry University of Gujrat Gujrat50700 Pakistan Department of Nanotechnology and Advanced Materials Engineering Sejong University Seoul05006 Korea Republic of VKTech Research Center NTT Hi-Tech Institute Nguyen Tat Thanh University Ho Chi Minh City700000 Viet Nam Institute of Research and Development Duy Tan University Da Nang550000 Viet Nam Faculty of Environmental Chemical Engineering Duy Tan University Da Nang550000 Viet Nam Department of Environment and Energy Sejong University Seoul05006 Korea Republic of

Metal-organic frameworks (MOFs) have emerged as a key focus in water treatment and monitoring due to their unique structural features, including extensive surface area, customizable porosity, reversible adsorption, and high catalytic efficiency. While numerous reviews have discussed MOFs in environmental remediation, this review specifically addresses recent advancements in modifying MOFs to enhance their effectiveness in water purification and monitoring. It underscores their roles as adsorbents, photocatalysts, and in luminescent and electrochemical sensing. Advancements such as pore modification, defect engineering, and functionalization, combined synergistically with advanced materials, have led to the development of recyclable MOF-based nano-adsorbents, Z-scheme photocatalytic systems, nanocomposites, and hybrid materials. These innovations have broadened the spectrum of removable contaminants and improved material recyclability. Additionally, this review delves into the creation of multifunctional MOF materials, the development of robust MOF variants, and the simplification of synthesis methods, marking significant progress in MOF sensor technology. Furthermore, the review addresses current challenges in this field and proposes potential future research directions and practical applications. The growing research interest in MOFs underscores the need for an updated synthesis of knowledge in this area, focusing on both current challenges and future opportunities in water remediation. © 2024 Elsevier Ltd

关键词： Metal-Organic Frameworks

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Interpretable RNA Foundation Model from Unannotated Data for highly Accurate RNA Structure and Function Predictions

arXiv

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arXiv 2022年

作者： Chen, Jiayang Hu, Zhihang Sun, Siqi Tan, Qingxiong Wang, Yixuan Yu, Qinze Zong, Licheng Hong, Liang Xiao, Jin Shen, Tao King, Irwin Li, Yu Department of Computer Science and Engineering The Chinese University of Hong Kong Hong Kong Research Institute of Intelligent Complex Systems Fudan University Shanghai China Shanghai AI Laboratory Shanghai China Harbin Institute of Technology China University of Electronic Science and Technology of China China Institute for Medical Engineering and Science Massachusetts Institute of Technology CambridgeMA United States Wyss Institute for Biologically Inspired Engineering Harvard University BostonMA United States Broad Institute of MIT and Harvard CambridgeMA United States Zelixir Biotech Shanghai China The CUHK Shenzhen Research Institute Hi-Tech Park Nanshan Shenzhen China

Non-coding RNA structure and function are essential to understanding various biological processes, such as cell signaling, gene expression, and post-transcriptional regulations. These are all among the core problems in the RNA field. With the rapid growth of sequencing technology, we have accumulated a massive amount of unannotated RNA sequences. On the other hand, expensive experimental observatory results in only limited numbers of annotated data and 3D structures. Hence, it is still challenging to design computational methods for predicting their structures and functions. The lack of annotated data and systematic study causes inferior performance. To resolve the issue, we propose a novel RNA foundation model (RNA-FM) to take advantage of all the 23 million non-coding RNA sequences through self-supervised learning. Within this approach, we discover that the pre-trained RNA-FM could infer sequential and evolutionary information of non-coding RNAs without using any labels. Furthermore, we demonstrate RNA-FM's effectiveness by applying it to the downstream secondary/3D structure prediction, SARS-CoV-2 genome structure and evolution prediction, protein-RNA binding preference modeling, and gene expression regulation modeling. The comprehensive experiments show that the proposed method improves the RNA structural and functional modelling results significantly and consistently. Despite only being trained with unlabelled data, RNA-FM can serve as the foundational model for the field. © 2022, CC BY-NC-ND.

关键词： RNA

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Research on Optimization of Hoisting Sequence of Main Girder of Asymmetric Long-span Suspension Bridge 3

Research on Optimization of Hoisting Sequence of Main Girder...

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2020 3rd International Symposium on Traffic Transportation and Civil Architecture, ISTTCA 2020

作者： Xiong, Shaohui Li, Yang Fu, Bin Chongqing Jiaotong University Chongqing400067 China China Merchants Chongqing Communicationgs Technology Research and Design Institute Co. Ltd. Chongqing400067 China Zhonglu Hi-Tech Traffic Inspection and Certification Co. Ltd. Xi'An Branch Xi'an710061 China Chongqing Zhixiang Paving Technology Engineering Co. Ltd. Chongqing400067 China

With the emergence of asymmetric long-span suspension bridge, it is necessary to study the optimization of hoisting sequence of the main girder of this type of suspension bridge. According to the relationship between the lifting sequence of the main girder and the pushing scheme of the pylon, the method flow of optimizing the lifting sequence of the main girder of the asymmetric long-span suspension bridge is given. Taking an asymmetrical long-span suspension bridge in Guangdong Province as an example, this method is used to optimize the hoisting sequence of the main girder and put it into practice. Good results are obtained and verified: the hoisting of the main girder should be carried out from the middle of the span to the two pylons, and the hoisting speed of the middle side span should be consistent with the proportion of the standard beam sections of the middle side span, and the maximum allowable deviation of the pylon and the main girder should be used in the jacking scheme of the pylon The hoisting sequence shall be formulated based on. It can provide a useful reference for the hoisting of the main girder of the same type suspension bridge and the suspension bridge with slings on both sides of the bridge. © Published under licence by IOP Publishing Ltd.

关键词： Suspension bridges

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Noise Assessment of Delivery Drones in an Urban Environment

SSRN

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SSRN 2022年

作者： Tan, Qichen Bian, Haoyu Guo, Jingwen Zhou, Peng Lo, Hong Kam Zhong, Siyang Zhang, Xin Nansha District Guangzhou China Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Department of Civil and Environmental Engineering The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong HKUST Shenzhen Research Institute Hi-Tech Park Nanshan District Shenzhen518057 China

In this work, the noise impact of delivery drones in an urban community is assessed based on a flight simulation and noise assessment platform. The tonal and broadband noise components are considered using analytical and semi-analytical prediction methods. The noise propagation in the urban environment is computed using an efficient Gaussian beam tracing method. The influence of flight speeds, payloads and ground vegetation on noise reception at different observation locations are investigated. The instantaneous sound level can be higher if the drone is operated at a relatively higher speed. However, the overall sound emission might be lower because of the shorter flight time. Similarly, the drone with a heavier payload could be louder, but in the meanwhile, fewer flight times are required. The platform provides an economical approach to understand the effect of those completing influential factors, which are essential for the following low-noise flight path planning. © 2022, The Authors. All rights reserved.

关键词： Motion planning

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Solubilizer (Deea, N-Pentanol and N-Butanol) Reconstructs the Influences of the Hydrogen-Bond Network of Nonaqueous Biphasic Solvent (Pmdeta/Mea/Dmso) on the Adsorption, Phase Splitting and Desorption

SSRN

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SSRN 2023年

作者： Jin, Lijian Zhan, Lingxiao Hou, Xueyan Xie, Shangzhi Gu, Lina Yang, Hangqi Wang, Xin Hou, Dawei Shen, Jianchong Zhang, Liqun Yang, Linjun KeyLaboratoryofEnergyThermalConversionandControlofMinistryEducation School of Energy and Environment Southeast University Nanjing210096 China Guangxi Colleges University Key Laboratory of Applied Chemistry Technology and Resource Development School of Chemistry and Chemical Engineering Guangxi University Nanning530004 China East China Electric Power Test & Researcher Institute China Datang Corporation Science and Technology Research Institute Co. LTD Hefei230088 PR China Hangzhou Kuaikai Hi-Tech Co. LTD Hangzhou310051 PR China

Nonaqueous biphasic solvent has remarkable energy-saving potential has remarkable energy-saving potential. The absence of strong hydrogen bonding interactions between N, N, N', N'', N''-pentamethyldiethylenetriamine (PMDETA) and Dimethyl sulfoxide (DMSO) facilitates the facile separation of polar CO2 products from the DMSO molecules surrounding PMDETA, thereby enabling efficient liquid-liquid biphasic behavior. Nevertheless, the weak interactions of PMDETA with other solvent molecules pose considerable challenges in the formulation of fresh homogeneous phase solutions. This study proposes a strategy to enhance PMDETA dissolution by introducing a solubilizer into a hybrid phase splitter, thereby increasing the concentration of PMDETA in the solvent. With the addition of a small quantity of solubilizer, the absorption, regeneration, and phase separation performance among the absorbents are comparable. The phase separation performance is influenced by the number of hydrogen bonds formed by the solubilizer, and the concentration of solubilizer in the lower phase is dependent on its hydrophobicity. Characterization using 13C NMR and FT-IR indicates that CO2 products primarily exist in the form of MEACOO-/MEAH+. Through DFT and molecular dynamics simulations, the impact of the solvent environment surrounding Ethanolamine (MEA) on the MEA+COO- deprotonation reaction is analyzed. While PMDETA offers a more favorable proton acceptance energy compared to MEA, the limited opportunities for PMDETA to come into contact with MEA molecules may be the primary hindrance to its participation in the reaction. Significantly lower corrosivity and regeneration energy requirements for non-aqueous biphasic solvents compared to 30 wt% MEA, making them ideal candidates for energy-efficient, low-corrosivity CO2 capture. © 2023, The Authors. All rights reserved.

关键词： Carbon dioxide

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Non-Noble Single-Atom Alloy for Electrocatalytic Nitrate Reduction Using hierarchical high-Throughput Screening

SSRN

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SSRN 2023年

作者： Wang, Shuo Li, Lei Hui, Kwan San Dinh, Duc Anh Lu, Zhiyi Zhang, Qiuju Hui, Kwun Nam Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of Macau Avenida da Universidade Taipa China Hefei National Laboratory for Physical Sciences at the Microscale Collaborative Innovation Center of Chemistry for Energy Materials University of Science and Technology of China Hefei230026 China School of Engineering Faculty of Science University of East Anglia NorwichNR4 7TJ United Kingdom NTT Hi-Tech Institute Nguyen Tat Thanh university Ho Chi Minh city700000 Viet Nam Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Zhejiang Ningbo315201 China University of Chinese Academy of Sciences Beijing100049 China

Electrochemical nitrate reduction reaction (NO3RR) holds promise for the management of wastewater contamination and synthesis of carbon-neutral ammonia (NH3). However, high−quality catalysts with controllable reaction pathways and high activity and selectivity are still lacking. The emerging single atom alloys (SAAs) offer attractive possibilities in nitrate reduction due to their unique atomic and electronic structures. By high−throughput first−principles calculations, we explore the possible incorporation of a series of transition−metal alloyed Cu−based SAAs, referred to as TM/Cu(111), for NO3RR toward NH3. A hierarchical four−step screening strategy have been employed to evaluate twenty−seven SAA catalysts yielding three alloying elements (Ti, Ni and Nb) with high catalytic activity and NO3RR selectivity. Finally, only Ni/Cu(111) possess the best activity among these three candidates because of its lowest limiting potential of −0.39 V. After further analysis, we found that the adsorption free energy of *NO3 can be recognized as efficient descriptor to design and predict the NO3RR performance of SAA. Furthermore, the Cu−based SAAs were revealed to exhibit pH dependent properties, which influence the competition between the hydrogen evolution reaction (HER) and NO3RR. This work not only indicates the significant potential of SAA in electrocatalysis for NO3RR to NH3, but also highlights the important influence of pH on the activity and selectivity of catalysts under reaction conditions. © 2023, The Authors. All rights reserved.

关键词： Nitrates

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Photodegradation-Induced Turn-On Luminescence of Tetraphenylethylene-Based Trithiocarbonate Polymers

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Chinese Journal of Chemistry 2021年第10期39卷 2837-2842页

作者： Hanchen Shen Wenjie Wu Shunjie Liu Jing Zhang Jacky WYLam Ben Zhong Tang Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction and Institute of Advanced StudyThe Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Department of Laboratory Medicine Nanfang HospitalSouthern Medical UniversityGuangzhouGuangdong 510515China HKUST Shenzhen Research Institute No.9 Yuexing 1 st RDSouth Area Hi-tech ParkNanshanShenzhenGuangdong518057 China Center for Aggregation-induced Emission SCUT-HKUST Joint Research InstituteState Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhouGuangdong510640 China HKUST AIE Institute Guangzhou Development DistrictHuangpuGuangzhouGuangdong510530 China Guangdong-Hong Kong-Macao Joint laboratory of Optoelectronic and Magnetic Functional Materials The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina

Main observation and conclusion Fluorescent intelligent materials have attracted wide attention because of their great potential *** major hurdle for the development and application of fluorescent intelligent materials is the aggregation-caused quenching effect in the solid ***,tetraphenylethylene-based trithiocarbonate polymers with satisfactory molecular weights(Mw up to 24900)were synthesized through a one-pot polymerization route under mild *** polymers were non-emissive due to the quenching effect of the trithiocarbonate ***,upon UV irradiation,the polymers degraded and strong emission from the tetraphenylethylene unit was *** a unique property endows them with great potential applications,such as photopatterning,anti-counterfeit labels,and UV detection.

关键词： Photochemistry Trithiocarbonate polymers Luminescence Polymerization Aggregation-induced emission

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