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Nickel-modified In_(2)O_(3) with inherent oxygen vacancies for CO_(2) hydrogenation to methanol

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Science China Chemistry 2024年第5期67卷 1715-1728页

作者： Zixuan Zhou Yuchen Wang yuanjie Bao Haiyan Yang Jiong li Chunran Chang Shenggang li Peng Gao CAS Key Laboratory of Low-Carbon Conversion Science and Engineering Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China University of Chinese Academy of Sciences Beijing 100049China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization School of Chemistry and Chemical EngineeringYulin UniversityYulin 719000China

Methanol synthesis is one of the most important industrially-viable approaches for carbon dioxide(CO_(2)) utilization, as the produced methanol can be used as a platform chemical for manufacturing green fuels and chemicals. The In_(2)O_(3) catalysts are ideal for sustainable methanol synthesis and have received considerable attention. Herein, Co-, Ni-and Cu-modified In_(2)O_(3) catalysts were fabricated with high dispersion and high stability to improve the hydrogenation performance. The Ni-promoted In_(2)O_(3) catalyst in the form of high dispersion possessed the largest amount of oxygen vacancies and the strongest ability for H_(2) activation, leading to the highest CO_(2) conversion and space time yield of methanol of 0.390 g_(Me OH)g_(cat)^(-1)h^(-1) with CH_(3)OH selectivity of 68.7%. In addition, the catalyst exhibits very stable performance over 120 h on stream, which suggests the promising prospect for industrial applications. Further experimental and theoretical studies demonstrate that surface Ni doping promotes the formation of oxygen defects on the In_(2)O_(3) catalyst, although it also results in lower methanol selectivity. Surprisingly, subsurface Ni dopants are found to be more beneficial for methanol formation than surface Ni dopants, so the Nipromoted In_(2)O_(3)catalyst with a lower surface Ni content at the similar Ni loading can reach higher methanol selectivity and productivity. This work thus provides theoretical guidance for significantly improving the CO_(2) reactivity of In_(2)O_(3)-based catalysts while maintaining high methanol selectivity.

关键词： carbon dioxide hydrogenation methanol synthesis indium oxides Ni doping sites transition metal promoters

Parasite-host network analysis provides insights into the evolution of two mistletoe lineages(Loranthaceae and Santalaceae)

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Plant Diversity 2023年第6期45卷 702-711页

作者： Jin Zhao yuanjie li Xuanni Wang Manru li Wenbin Yu Jin Chen ling Zhang CAS Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMengla 666303YunnanChina Engineering Research Center of Eco-environment in Three Gorges Reservoir Region Ministry of EducationChina Three Gorges UniversityYichang 443002HubeiChina Graduate School of the Chinese Academy of Sciences Beijing 100049China linnaeus Labs Technology Co. LtdWuyuan 333200JiangxiChina

Mistletoes are ecologically important parasitic plants,with> 1600 species from five lineages worldwide.Mistletoe lineages exhibit distinct patterns of species diversification and host specificity,however,the mechanisms underlying these differences are poorly understood.In this study,we analysed a comprehensive parasite-host network,including 280 host species from 60 families and 22 mistletoe species from two lineages(Santalaceae and Loranthaceae) in Xishuangbanna,located in a biodiversity hotspot of tropical Asia.We identified the factors that predict the infection strength of mistletoes.We also detected host specificity and the phylogenetic signal of mistletoes and their hosts.We found that this interaction network could be largely explained by a model based on the relative abundance of species.Host infection was positively correlated with diameter at breast height and tree coverage,but negatively correlated with wood density.Overall,closely related mistletoe species tend to interact more often with similar hosts.However,the two lineages showed a significantly different network pattern.Rates of host generality were higher in Loranthaceae than in Santalaceae,although neither lineage showed phylogenetic signal for host generality.This study demonstrates that the neutral interaction hypothesis provides suitable predictions of the mistletoe-host interaction network,and mistletoe species show significant phylogenetic signals for their hosts.Our findings also indicate that high species diversification in Loranthaceae may be explained by high rates of host generality and the evolutionary history shared by Loranthaceae species with diverse host plants in the tropics.

关键词： Loranthaceae Mistletoeehost interaction Neutral interaction hypothesis Parasiteehost network Santalaceae

Nickel-modified InOwith inherent oxygen vacancies for COhydrogenation to methanol

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Science China Chemistry 2024年

作者： Zixuan Zhou Yuchen Wang yuanjie Bao Haiyan Yang Jiong li Chunran Chang Shenggang li Peng Gao University of Chinese Academy of Sciences School of Physical Science and Technology ShanghaiTech University Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization School of Chemistry and Chemical Engineering Yulin University CAS Key Laboratory of Low-Carbon Conversion Science and Engineering Shanghai Advanced Research Institute Chinese Academy of Sciences

Methanol synthesis is one of the most important industrially-viable approaches for carbon dioxide (CO2) utilization,as the produced methanol can be used as a platform chemical for manufacturing green fuels and chemicals.The In2O3catalysts are ideal for sustainable methanol synthesis and have received considerable attention.Herein,Co-,Ni-and Cu-modified In2O3catalysts were fabricated with high dispersion and high stability to improve the hydrogenation performance.The Ni-promoted In2O3catalyst in the form of high dispersion possessed the largest amount of oxygen vacancies and the strongest ability for H2activation,leading to the highest CO2conversion and space time yield of methanol of 0.390 gMeOHg-1cath-1with CH3OH selectivity of 68.7%.In addition,the catalyst exhibits very stable performance over 120 h on stream,which suggests the promising prospect for industrial applications.Further experimental and theoretical studies demonstrate that surface Ni doping promotes the formation of oxygen defects on the In2O3catalyst,although it also results in lower methanol selectivity.Surprisingly,subsurface Ni dopants are found to be more beneficial for methanol formation than surface Ni dopants,so the Nipromoted In2O3catalyst with a lower surface Ni content at the similar Ni loading can reach higher methanol selectivity and productivity.This work thus provides theoretical guidance for significantly improving the CO2reactivity of In2O3-based catalysts while maintaining high methanol selectivity.

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High-Risk LEO Satellite Network Path Detection Based on Spatial and Temporal Delay Anomaly Analysis

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China Communications 2023年第7期20卷 57-71页

作者： Tianyu Zhang Hewu li Jun liu Lu Lu Qian Wu Shaowen Zheng Zeqi Lai yuanjie li Institute for Network Sciences and Cyberspace Tsinghua UniversityBeijing 100084China Beijing National Research Center for Information Science and Technology Beijing 100084China China Mobile Research Institute Beijing 100053China

The gradual deployment of Low-Earth Orbit(LEO)mega constellations with inter-satellite links(ISLs)promises ubiquitous,low-latency,and high-throughput satellite network services.However,networked LEO satellites with ISLs are also at risk of routing attacks such as hijacking.Existing defenses against route hijacking in terrestrial networks can hardly work for the LEO satellite network due to its high spatiotemporal dynamics.To deal with it,we propose RPD,a high-risk routing path detection method for LEO mega-constellation networks.RPD detects abnormal high-risk LEO network paths by checking the consistency between the path delay and the geographical distance.This is efficiently achieved by combining in-band measurements and out-of-band statistical processing to detect the anomaly of the clustering feature in the reference delay matrix.RPD avoids the recalculation of the header cryptographic marks when the handover occurs,thus greatly reducing the cost and improving the performance of highrisk path detection.Experiments showed that the proposed RPD mechanism achieves an average detection accuracy of 91.64%under normal network conditions,and maintain about 89%even when congestion occurs in multiple areas of the network and measurement noise is considered.In addition,RPD does not require any cryptographic operation on the intermediate node,only minimal communication cost with excellent scalability and deployability.

关键词： LEO satellite networks route hijacking path verification risky path detection

Characterization and structure analysis of the heterosolvate of erythromycin thiocyanate

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Chinese Journal of Chemical Engineering 2022年第4期35卷 268-274页

作者： yuanjie li Qiuxiang Yin Meijing Zhang Ying Bao Baohong Hou Jingkang Wang Jiting Huang ling Zhou School of Chemical Engineering and Technology State Key Laboratory of Chemical EngineeringTianjin UniversityTianjin 300350China Collaborative Innovation Center of Chemical Science and Chemical Engineering(Tianjin) Tianjin 300072China Luoxin Pharmaceutical(Shanghai)Co. Ltd.Shanghai 201203China

Erythromycin thiocyanate is widely used for the production of other macrolide antibiotics. In this work, a novel heterosolvate of this pharmaceutical compound has been obtained and characterized for the first time, which was transformed from the dihydrate form in the acetone solvent through evaporation crystallization. Thermal behavior together with compositional analysis revealed that both water and acetone molecules participated in the formation of the crystal lattice which is rarely reported before. The general chemical name of the heterosolvate may be defined as erythromycin thiocyanate sesquihydrate hemiacetonate. Furthermore, studies on solid-state spectral analysis provided strong evidence of intermolecular hydrogen bonds in heterosolvate crystals. According to the crystal structure determined by single crystal X-ray diffraction, the formation mechanism of the heterosolvate is proposed in which strong multihydrogen bondings between water and solute molecules form the layer structure. While acetone molecules form single-hydrogen bonds with solutes and reside in channels between layers. This well explains why acetone solvent is easy to escape from the crystal structure during desolvation.

关键词： Erythromycin thiocyanate Heterosolvate Structure analysis Crystallization Thermodynamic properties Transition

Unsourced Multiple Access for 6G Massive Machine Type Communications

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China Communications 2022年第3期19卷 70-87页

作者： yuanjie li Jincheng Dai Zhongwei Si Kai Niu Chao Dong Jiaru lin Sen Wang Yifei Yuan Key Laboratory of Universal Wireless Communications Beijing University of Posts and TelecommunicationsBeijing 100876China China Mobile Research Institute Beijing 100053China

Unsourced multiple access(UMA)is a multi-access technology for massive,low-power,uncoordinated,and unsourced Machine Type Communication(MTC)networks.It ensures transmission reliability under the premise of high energy efficiency.Based on the analysis of the 6G MTC key performance indicators(KPIs)and scenario characteristics,this paper summarizes its requirements for radio access networks.Following this,the existing multiple access models are analyzed under these standards to determine UMA's advantages for 6G MTC according to its design characteristics.The critical technology of UMA is the design of its multiple-access coding scheme.Therefore,the existing UMA coding schemes from different coding paradigms are further summarized and compared.In particular,this paper comprehensively considers the energy efficiency and computational complexity of these schemes,studies the changes of the above two indexes with the increase of access scale,and considers the trade-off between the two.It is revealed by the above analysis that some guiding rules of UMA coding design.Finally,the open problems and potentials in this field are given for future research.

关键词： unsourced multiple access machine type communications 6G massive random access uncoordinated

人工智能在肺磨玻璃结节鉴别诊断中的研究进展

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中华结核和呼吸杂志 2024年第6期47卷 566-570页

作者：李元婕王渊邱志新四川大学华西医院呼吸与危重症医学科呼吸和共病全国重点实验室成都610041 四川大学华西医院呼吸与危重症医学科呼吸健康研究所、四川大学疾病分子网络前沿科学中心成都610041

肺磨玻璃结节(GGN)作为常见的肺部影像学表现,可见于多种病理状态,如炎症、出血、肺腺癌等。临床诊疗中,主要通过分析其影像学特征,初步预测GGN的性质,进而选择最佳的个性化诊疗方案及随访管理策略。随着信息学技术的迅速发展与普及,人... 详细信息

肺磨玻璃结节(GGN)作为常见的肺部影像学表现,可见于多种病理状态,如炎症、出血、肺腺癌等。临床诊疗中,主要通过分析其影像学特征,初步预测GGN的性质,进而选择最佳的个性化诊疗方案及随访管理策略。随着信息学技术的迅速发展与普及,人工智能(AI)通过深度学习、多维度分析病例样本,构建医学影像辅助诊断模型,目前正逐步应用于GGN影像检测及预测。AI的临床应用省时省力,同时也提高了GGN预测的准确性。本文对AI在GGN良恶性、病理学亚型和EGFR突变鉴别诊断中的研究进展作一综述。

关键词：肺磨玻璃结节随访管理 EGFR突变良恶性医学影像深度学习肺腺癌多维度分析

Performance assessment of innovative seismic resilient steel knee braced frame

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Frontiers of Structural and Civil Engineering 2016年第3期10卷 291-302页

作者： Tony T. Y. YANG yuanjie li International Joint Research Laboratory of Eearthquake Engineering 1239 Siping Road Shanghai 200002 China Department of Civil Engineering University of British Columbia Vancouver BC V6T1Z4 Canada

Buckling restrained knee braced truss moment frame （BRKBTMF） is a novel and innovative steel structural system that utilizes the advantages of long-span trusses and dedicated structural fuses for seismic applications. Steel trusses are very economical and effective in spanning large distance. However, conventional steel trusses are typically not suitable for seismic application, due to its lack of ductility and poor energy dissipation capacity. BRKBTMF utilizes buckling restrained braces （BRBs） as the designated structural fuses to dissipate the sudden surge of earthquake energy. This allows the BRKBTMF to economically and efficiently create large span structural systems for seismic applications. In this paper, a prototype BRKBTMF office building located in Berkeley, California, USA, was designed using performance-based plastic design procedure. The seismic performance of the prototype building was assessed using the state-of-the-art finite element software, OpenSees. Detailed BRB hysteresis and advanced element removal technique was implemented. The modeling approach allows the simulation for the force-deformation response of the BRB and the force redistribution within the system after the BRBs fracture. The developed finite element model was analyzed using incremental dynamic analysis approach to quantify the seismic performance of BRKBTMF. The results show BRKBTMF has excellent seismic performance with well controlled structural responses and resistance against collapse. In addition, life cycle repair cost of BRKBTMF was assessed using the next-generation performance-based earthquake engineering framework. The results confirm that BRKBTMF can effectively control the structural and non-structural component damages and minimize the repair costs of the structure under different ranges of earthquake shaking intensities. This studies conclude that BRKBTMF is a viable and effective seismic force resisting system.

关键词： buckling restrained brace innovative structural system collapse simulation seismic assessment

Joint Multi-User Detection with Weighting Factors for Unsourced Multiple Access

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Journal of Computer and Communications 2023年第9期11卷 121-131页

作者： Yu liu Kai Niu yuanjie li The Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing China

Multi-user detection techniques are currently being studied as highly promising technologies for improving the performance of unsourced multiple access systems. In this paper, we propose joint multi-user detection schemes with weighting factors for unsourced multiple access. First, we introduce bidirectional weighting factors in the extrinsic information passing process between the multi-user detector based on belief propagation (BP) and the LDPC decoder. Second, we incorporate bidirectional weighting factors in the message passing process between the MAC nodes and the user variable nodes in BP- based multi-user detector. The proposed schemes select the optimal weighting factors through simulations. The simulation results demonstrate that the proposed schemes exhibit significant performance improvements in terms of block error rate (BLER) compared to traditional schemes. .

关键词： Communication Sparse IDMA Multi-User Detection Belief Propagation