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SSRN 2023年

作者： Jin, Lijian Hou, Xueyan Zhan, Lingxiao Xie, Shangzhi Gu, Lina Yang, Hangqi Wang, Xin Qian, Xinfeng Shen, Jianchong Yang, Linjun Key Laboratory of Energy Thermal Conversionand Control Ministry Education School of Energy and Environment Southeast University Nanjing210096 China Guangxi Colleges and 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 China Hangzhou Kuaikai Hi-Tech Co. Ltd Hangzhou310051 China

In order to ameliorate the issues of corrosion and high regeneration energy associated with traditional biphasic solvents, a nonaqueous biphasic solvent has been proposed as a potential alternative. This study introduces Tetramethylethylenediamine (TMEDA) as a phase splitter within the Ethanolamine (MEA)/ Dimethyl sulfoxide (DMSO) system, resulting in a novel nonaqueous biphasic solvent, TMEDA/MEA/DMSO. The highly polarity of TMEDA facilitates mutual solubility with MEA/DMSO while lacking robust hydrogen bonding interactions with DMSO, enabling the facile separation of polar CO2 products from the vicinity of TMEDA, thus forming a liquid-liquid biphasic system. When the mass ratio of TMEDA/MEA/DMSO is maintained at 3:3:4, the CO2 loading attains 0.54 mol (CO2)/mol (MEA), with the rich phase comprising 75% of the total. 13C NMR and FT-IR characteristics showed that the absorbent product is mainly in the form of MEACOO-/MEAH+. Absorption and phase separation mechanisms of absorbent elucidated by DFT calculations and molecular dynamics simulations. The limited opportunity for TMEDA to interact with MEA molecules emerges as the primary reason for its reduced involvement in the reaction, with the inclusion of TMEDA intensifying the aggregation of MEACOO-/MEAH+ and triggering phase transition. In comparison to a 30 wt% MEA water-based absorbent, TMEDA/MEA/DMSO exhibits a 40% reduction in regeneration energy and possesses energy-saving attributes, rendering it a promising candidate for CO2 capture. © 2023, The Authors. All rights reserved.

关键词： Carbon dioxide

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Solubilizer Reconstructs the Influences of the Hydrogen-Bond Network of Nonaqueous Biphasic Solvent on the Adsorption, Phase Splitting and Desorption

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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 Key Laboratory of Energy Thermal Conversion and Control Ministry of Education School of Energy and Environment Southeast University Nanjing210096 China Guangxi Colleges and 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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Analysis of Absorption and Regeneration Performance Changes of Diethylenetriamine in Carbon Capture Environments with Functionalized Alcohols and Mixed Amines

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SSRN 2023年

作者： Jin, Lijian Hou, Xueyan Zhan, Lingxiao Hou, Dawei Gu, Lina Zhang, Daguang Shen, Jianchong Zheng, Zhihao Lv, Chao Liu, Shaoqing Yang, Linjun Key Laboratory of Energy Thermal Conversion and Control of Ministry Education School of Energy and Environment Southeast University Nanjing210096 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 Guangxi Colleges University Key Laboratory of Applied Chemistry Technology and Resource Development School of Chemistry and Chemical Engineering Guangxi University Nanning530004 China

Reducing energy consumption in carbon capture using two-phase solvents hinges on the occurrence of phase separation phenomena. In this investigation, we systematically assessed the absorption, regeneration, and phase separation capabilities of five distinct alcohols (n-propanol, n-butanol(-CH3), 3-Methoxy-1-propanol(-OCH3), 3-Chloro-1-propanol(-Cl), and 3-Methyl thiopropanol(-SCH3)) featuring diverse hydrophobicity levels and functional groups, in conjunction with three active amines (DETA, AMP, MEA). The results showed that, in addition to -Cl being influenced by strong forces between the alcohol-active amine, the greater the hydrophobicity of the alcohol (log P), the shorter the phase separation time, and the change in the carbon capture environment of the organic amine after the phase separation resulted in a rapid decrease in the absorption rate, so that the solvent absorption load was higher for alcohol phase separators with low log P values. Moreover, augmenting the alcohol content in the rich phase facilitates superior regeneration performance. Notably, -Cl benefits from potent amine-alcohol interactions, resulting in a significantly enhanced cycling capacity compared to the other four amines. The larger dipole moment of the DETA product emerges as a potential candidate for the primary component in the mixed amine phase separation. Synergistic effects between MEA and DETA are evident, as the partial substitution of DETA with MEA yields no substantial changes in phase separation performance. Additionally, quantum chemical calculations were employed to validate the reaction mechanism of mixed amines and the influence of product interactions on viscosity. Molecular dynamics simulations were also conducted to corroborate the alterations in phase separation performance and the interplay between components in different alcohol phase separation agents. © 2023, The Authors. All rights reserved.

关键词： Molecular dynamics

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Tuning and Optimization of Tow-Phase Absorbents(Deea/Aeea/H2o) with Hybrid Phase Splitter (N-Butanol/Deea) for Several Properties: Carbon Capture, Phase Separation, Physical Properties

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SSRN 2023年

In this study, we examined the impacts of complete and partial substitution of DEEA with physical solvents (n-butanol) on the performance of AEEA/H2O absorption, regeneration, and phase separation. The higher hydrophobicity (log P) of n-butanol, as a phase splitter, expedites the separation process from the AEEA product. Through additional refinement of the mass ratio between n-butanol and DEEA, it was observed that substituting a small portion of DEEA with n-butanol had negligible impact on the absorption capacity and enrichment of the enriched phase. However, it significantly reduced the phase separation time between the two solvent phases. Furthermore, an increase in n-butanol concentration can enhance cyclic loading. On the other hand, it reduces the production of AEEACOO-/DEEAH+, which is more stable compared with AEEACOO-/AEEAH+. Molecular dynamics simulations revealed that n-butanol can modulate the reduction of water molecules surrounding AEEA, creating a lower water molecule environment that enhances CO2 diffusion and augments the rate of AEEA initiation uptake. The addition of a low concentration of n-butanol improves the initial absorption rate, phase separation performance, circulation capacity, and further reduces the regeneration energy of the absorption solution without compromising the absorption load and regeneration energy. © 2023, The Authors. All rights reserved.

关键词： Density functional theory

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STF-GCN: A Multi-Domain Graph Convolution Network Method for Automatic Modulation Recognition via Adaptive Correlation

arXiv

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arXiv 2025年

作者： Shao, Mingyuan Fu, Zhengqiu Li, Dingzhao Zhang, Fuqing Cai, Yilin Hong, Shaohua Cao, Lin Peng, Yuan Qi, Jie School of Electronic Science and Engineering Xiamen University Fujian Xiamen361005 China School of Informatics Xiamen University Fujian Xiamen361005 China The Key Laboratory of Southeast Coast Marine Information Intelligent Perception and Application Ministry of Natural Resources Xiamen361005 China Science and Technology on Underwater Test and Control Laboratory Liaoning Dalian116013 China

Automatic Modulation Recognition (AMR) is an essential part of Intelligent Transportation System (ITS) dynamic spectrum allocation. However, current deep learning-based AMR (DL-AMR) methods are challenged to extract discriminative and robust features at low signal-to-noise ratios (SNRs), where the representation of modulation symbols is highly interfered by noise. Furthermore, current research on GNN methods for AMR tasks generally suffers from issues related to graph structure construction and computational complexity. In this paper, we propose a Spatial-Temporal-Frequency Graph Convolution Network (STF-GCN) framework, with the temporal domain as the anchor point, to fuse spatial and frequency domain features embedded in the graph structure nodes. On this basis, an adaptive correlation-based adjacency matrix construction method is proposed, which significantly enhances the graph structure’s capacity to aggregate local information into individual nodes. In addition, a PoolGAT layer is proposed to coarsen and compress the global key features of the graph, significantly reducing the computational complexity. The results of the experiments confirm that STF-GCN is able to achieve recognition performance far beyond the state-of-the-art DL-AMR algorithms, with overall accuracies of 64.35%, 66.04% and 70.95% on the RML2016.10a, RML2016.10b and RML22 datasets, respectively. Furthermore, the average recognition accuracies under low SNR conditions from -14dB to 0dB outperform the state-of-the-art (SOTA) models by 1.20%, 1.95% and 1.83%, respectively. © 2025, CC BY.

关键词： Frequency domain analysis

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Sliding sequential CVAE with time variant socially-aware rethinking for trajectory prediction

arXiv

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arXiv 2021年

作者： Zhou, Hao Ren, Dongchun Yang, Xu Fan, Mingyu Huang, Hai National Key Laboratory of Science and Technology of Underwater Vehicle Harbin Engineering University Harbin China State Key Laboratory of Management and Control for Complex System Institute of Automation Chinese Academy of Sciences Beijing China Research Center for Autonomous Vehicles Meituan Beijing China College of Computer Science Wenzhou University Wenzhou China National Key Laboratory of Science and Technology of Underwater Vehicle Harbin Engineering University Harbin China

Pedestrian trajectory prediction is a key technology in many applications such as video surveillance, social robot navigation, and autonomous driving, and significant progress has been made in this research topic. However, there remain two limitations of previous studies. First, with the continuation of time, the prediction error at each time step increases significantly, causing the final displacement error to be impossible to ignore. Second, the prediction results of multiple pedestrians might be impractical in the prediction horizon, i.e., the predicted trajectories might collide with each other. To overcome these limitations, this work proposes a novel trajectory prediction method called CSR, which consists of a cascaded conditional variational autoencoder (CVAE) module and a socially-aware regression module. The cascaded CVAE module first estimates the future trajectories in a sequential pattern. Specifically, each CVAE concatenates the past trajectories and the predicted points so far as the input and predicts the location at the following time step. Then, the socially-aware regression module generates offsets from the estimated future trajectories to produce the socially compliant final predictions, which are more reasonable and accurate results than the estimated trajectories. Moreover, considering the large model parameters of the cascaded CVAE module, a slide CVAE module is further exploited to improve the model efficiency using one shared CVAE, in a slidable manner. Experiments results demonstrate that the proposed method exhibits improvements over state-of-the-art method on the Stanford Drone Dataset (SDD) and ETH/UCY of approximately 38.0% and 22.2%, respectively. © 2021, CC BY.

关键词： Trajectories

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On-Road GHG Emissions Characteristics and Durability of Typical China-Vi Hddts in Intercity Transportation

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SSRN 2023年

作者： Lyu, Liqun Zhang, Youyuan Qin, Zhaoxiang Wang, Junfang Yin, Hang Feng, Jianyong Tan, Jianwei Hao, Lijun Ge, Yunshan School of Mechanical Engineering Beijing Institute of Technology Beijing100081 China Dongfeng Liuzhou Motor Co. Ltd Liuzhou545005 China State Environmental Protection Key Laboratory of Vehicle Emission Control and Simulation Chinese Research Academy of Environmental Sciences Beijing100012 China TRADING CO. LTD Beijing Branch Beijing100080 China National Laboratory of Automotive Performance &amp Emission Test China

China confronts rising greenhouse gas (GHG) emissions from transportation sector, particularly under-addressed emissions from heavy-duty diesel vehicles (HDDVs), challenging its carbon neutrality goal by 2060. Using a portable emission measurement system (PEMS), the on-road CO2, CH4, and N2O emissions characteristics and durability of seven typical China-VI HDDVs applied for intercity transportation were evaluated. A direct correlation was observed between increased instantaneous CO2 emissions and vehicle specific power (VSP), affirming the positive dependency of CO2 emissions on engine power. However, CH4 emissions remained negligible across various speeds, displaying no obvious correlation with VSP, suggesting that power fluctuations were not the primary factor impacting the CH4. N2O emissions, on the other hand, were independent of speed but increased with increasing VSP. The main explanation is that power fluctuations change the pathway of selective reduction processes in selective catalytic reduction (SCR), affecting N2O selectivity. On-road emission factors indicated declining CO2 and CH4 with increased speed, in contrast to N2O, which presented minimal speed correlation. CH4 and N2O collectively constituted 2.78 – 6.41% of total CO2-equivalent emissions, with negligible CH4 contributions. Consequently, enhancing energy efficiency and optimizing N2O selectivity in SCR are pivotal strategies for controlling GHG emissions of China-VI HDDVs. Regarding durability, engine wear will not significantly increase CO2 emissions, and the CH4 emission durability does not require attention. However, the N2O emission durability necessitates particular attention, given that SCR aging markedly increases N2O selectivity. Notably, the N2O emissions from China-VI HDDVs appear to deteriorate linearly with the increased driving mileages, with R2 ranging from 0.85 to 0.94, and the emission factors are significantly higher than those of HDDVs equipped with other after-treatment techn

关键词： Selective catalytic reduction

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Recycled Aggregate Concrete-Filled Steel Tube Columns with Small-Diameter Circular Frp-Confined Sea-Sand Concrete Cores: Conceptual and Experimental Investigations

SSRN

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SSRN 2023年

作者： Zeng, Lan Wu, Liqi Li, Boqin Fang, Shu Mohamed, Hazem Samih Fang, Zhuangcheng Yuan, Hong MOE Key Laboratory of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University Guangdong Guangzhou510632 China Guangdong Architectural Design and Research Institute Co. Ltd. Guangzhou510006 China Guangdong Key Laboratory of Earthquake Engineering & Applied Technique Earthquake Engineering Research & Test Centre Guangzhou University Guangzhou510006 China School of Architectural Engineering Guangzhou Institute of Science and Technology Guangzhou510540 China Fujian Agriculture and Forestry University China

Recycled aggregate concrete (RAC) prepared from waste concrete can achieve the green recycling of resources;however, its inferior material properties hinder its applications. Sea-sand concrete (SSC) can help alleviate the resource shortage of fresh water and river sands but is prone to steel corrosion. To address these challenges, this study developed a new RAC-filled steel tube column with a small-diameter circular fibre-reinforced polymer (FRP)-confined SSC core. This paper presents and discusses the results of the axial compression tests conducted on RAC-filled steel tube columns, with and without small-diameter circular FRP-confined SSC cores. The study investigated the effects of the configuration of the FRP-confined SSC core, diameter-to-thickness ratio of the FRP tubes, compressive strength of RAC and SSC, and cross-sectional shape of the column. The results revealed that using small-diameter circular FRP-confined SSC cores to partially replace RAC was effective in improving the compressive performance of RAC-filled steel tube columns. The increase in the number of FRP tubes, in-filled concrete strength, and confinement stiffness of the steel and FRP tubes contributed to improvements in the structural strength and ductility, resulting in progressive ladder-shaped declines in the post-peak curve. Finally, a reasonable load–capacity model is presented for the proposed columns. © 2023, The Authors. All rights reserved.

关键词： Steel corrosion

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Improved Comprehensive Inertial control for ESS Participating Primary Frequency Regulation Based on Fuzzy control 5

Improved Comprehensive Inertial Control for ESS Participatin...

引用

5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Xiang, Yongjian Xu, Yunhui Zhou, Tao Dai, Zhongjian Ren, Bixing Zhang, Lei Nanjing University of Science and Technology School of Automation Nanjing China State Grid Lishui Power Supply Company Substation Operation Inspection Center Lishui China Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan China State Grid Changzhou Power Supply Company Operation and Maintenance Department Changzhou China Jiangsu Electric Power Test Research Institute Co. Ltd. Nanjing China China Classification Society Product Plan Approval Center Nanjing China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

ESS (energy storage system) has many advantages such as flexible control, large throughput capacity and fast response speed and can provide strong support for system frequency stability with larger-scale renewable energy. In order to enhance the frequency regulation effect of ESS, this paper proposes an improved comprehensive inertia control strategy based on FC (fuzzy control). The conventional droop control is replaced by fuzzy control to improve the regulation performance and adaptivity of the whole process. SOC (state of charge) is adopted as the input of FC to consider the secure and stable constraints of ESS. In addition, FC is also applied to adjust the virtual inertia coefficients online. The proposed strategy combines the advantages of comprehensive inertial control and adaptive control and improve the frequency supporting ability of ESS under different operation conditions. Finally, simulations are conducted to demonstrate the feasibility of the proposed method. © 2022 IEEE.

关键词： Fuzzy control

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Excellent high-temperature friction and wear resistance of high–Cr die steels by trace in–situ nano-ceramics

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Ceramics International 2025年第14期51卷 18540-18552页

作者： Bao, Ze-Ju Yang, Hong-Yu Dong, Bai-Xin Zhong, Xin-Miao Li, Yi-Lu Li, Ai-Min Wang, Cheng-Gang Li, Zhi-Gang Meng, Jia Qiao, Jian Kang, Jie Zhu, Ming Shu, Shi-Li Xu, Hui-Xia Qiu, Feng Jiang, Qi-Chuan State Key Laboratory of Automotive Simulation and Control Jilin University China Key Laboratory of Automobile Materials Ministry of Education and Department of Materials Science and Engineering Jilin University Renmin Street NO. 5988 Jilin Province Changchun130025 China ZhonghangShangda Superalloys Materials Co. Ltd No.16 Wangong Avenue Qinghe County Xingtai City Hebei Province 054800 China Technology Research and Development Casting & Forging Research Institute FAW Foundry Co. Ltd Crossing of Hexie Street & Bingwu Road Automotive Industry Development Zone Changchun Jilin Province 130013 China Department and Test Center FAW-Volkswagen Automotive Co. Ltd Jilin Province Changchun130011 China School of Mechatronic Engineering and Automation Foshan University No. 33 Guangyun Road Nanhai District Guangdong Province Foshan528231 China Jilin Liyuan Precision Manufacturing Co. Ltd. No. 5729 Xi'ning Road Economic Development Zone Jilin Province LiaoYuan136299 China Zhenjiang Xianfeng Automotive Parts Co. Ltd Dantu High Tech Industrial Park Jiangsu Province Zhenjiang212000 China School of Mechanical and Aerospace Engineering Jilin University Renmin Street NO. 5988 Changchun130025 China Jiangsu Tiangong Corporation Ltd A8 Tonggang Road Jiangsu Province Danyang212000 China

In this study, TiC + TiB2 nano-ceramics reinforced high–Cr die steels were successfully prepared using aluminum-based master alloy as a carrier for the nano-ceramics. The impact of nano-ceramics on the microstructure of steels as well as the tensile properties and friction and wear properties under high temperature conditions were explored. The incorporated nano-ceramics can significantly refine the microstructure of steels, resulting in finer and more uniformly precipitated carbides, thereby effectively improving the mechanical properties of steels. Compared with unmanipulated high–Cr die steels, the high-temperature (550 °C) yield strength of high–Cr steels reinforced with 0.02 wt% nano-ceramic was increased from 963 MPa to 1274 MPa. The volume wear rate of nano-ceramics reinforced high Cr steels reached 11.9 × 10−13 m3/m, 3.4 × 10−13 m3/m, 5.6 × 10−13 m3/m and 6.3 × 10−13 m3/m under the four conditions of 400 °C-30 N-300 r/min, 550 °C-20 N-300 r/min, 550 °C-30 N-300 r/min and 550 °C-40 N-300 r/min, which were reduced by 23.7 %, 34.6 %, 34.9 % and 35.1 % respectively. These results provide a new insight into improving the high-temperature friction and wear properties of steels. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Aluminum alloys

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