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Science Bulletin 2018年第10期63卷 599-600页

作者： xiong wen(David)lou School of Chemical and Biomedical Engineering. Nanyang Technological University Singapore 637459 Singapore

Solar water splitting for hydrogen generation using semiconductor photocatalysts is a promising approach for developing renewable energy sources[1,2].To enhance the performance of semiconductor photocatalysts,cocatalytic materials are normally utilized to accelerate surface redox *** most cases,cocatalysts are randomly decorated on the surface of photocatalysts,

关键词：氧化还原作用半导体光催化剂空间异质氢表面水

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Embedding CoS2 nanoparticles in N-doped carbon nanotube hollow frameworks for enhanced lithium storage properties

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Nano Research 2017年第12期10卷 4298-4304页

作者： Jintao Zhang Le Yu xiong wen (David) lou School of Chemical and Biomedical Engineering Nanyang Technological University 62 Nanyang Drive Singapore 637459 Singapore

The construction of metal sulfides-carbon nanocomposites with a hollow structure is highly attractive for various energy storage and conversion technologies. Herein, we report a facile two-step method for preparing a nanocomposite with CoS2 nanoparticles in N-doped carbon nanotube hollow frameworks （NCNTFs）. Starting from zeolitic imidazolate framework-67 （ZIF-67） particles, in situ reduced metallic cobalt nanocrystals expedite the formation of the hierarchical hollow frameworks from staggered carbon nanotubes via a carbonization process. After a follow-up sulfidation reaction with sulfur powder, the embedded cobalt crystals are transformed into CoS2 nanoparticles. Benefitting from the robust hollow frameworks made of N-doped carbon nanotubes and highly active CoS2 ultrafine nanoparticles, this advanced nanocomposite shows greatly enhanced lithium storage properties when evaluated as an electrode for lithium-ion batteries. Impressively, the resultant CoS2/NCNTF material delivers a high specific capacity of -937 mAh.g-1 at a current density of 1.0 A-g-1 with a cycle life longer than 160 cycles.

关键词： COS2 carbon nanotube metal-organic framework lithium-ion batteries

Metal–Organic Framework-Assisted Synthesis of Compact Fe_2O_3 Nanotubes in Co_3O_4 Host with Enhanced Lithium Storage Properties

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Nano-Micro Letters 2018年第3期10卷 70-78页

作者： Song Lin Zhang Bu Yuan Guan Hao Bin Wu xiong wen David lou School of Chemical and Biomedical Engineering Nanyang Technological University School of Materials Science and Engineering Zhejiang University

Transition metal oxides are promising candidates for the high-capacity anode material in lithium-ion *** electrochemical performance of transition metal oxides can be improved by constructing suitable composite architectures. Herein, we demonstrate a metal–organic framework(MOF)-assisted strategy for the synthesis of a hierarchical hybrid nanostructure composed of Fe_2O_3 nanotubes assembled in Co_3O_4 host. Starting from MOF composite precursors(Fe-based MOF encapsulated in a Cobased host matrix), a complex structure of Co_3O_4 host and engulfed Fe_2O_3 nanotubes was prepared by a simple annealing treatment in air. By virtue of their structural and compositional features, these hierarchical composite particles reveal enhanced lithium storage properties when employed as anodes for lithium-ion batteries.

关键词： Metal–organic framework(MOF) Hierarchical structures Fe2O3 nanotubes Co3O4 Lithium-ion batteries(LIBs)

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Synthesis of Hollow Nanostructures for Electrochemical Energy Storage

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Synthesis of Hollow Nanostructures for Electrochemical Energ...

Synthesis of Nanostructured Metal Oxide Materials and Their Applications in Li-ion Batteries and Supercapacitors

第31届全国化学与物理电源学术年会

作者： xiong wen(David)lou School of Chemical and Biomedical Engineering Nanyang Technological University

Hollow nanostructures are promising as electrode materials for electrochemical energy storage,including lithium-ion batteries,supercapacitors and lithium-sulfur *** have employed hydrothermal/solvothermal methods to synthesize hollow nanostructures of different metal oxide/sulfide materials,and investigated their electrochemical properties in lithium-ion batteries and *** this talk,I will briefly discuss the synthesis and electrochemical properties of hollow nanostructures of metal oxides/*** have been able to synthesize different hollow nanostructures of many binary metal oxides such as SnO,FeO and FeO,and more recently mixed transition metal oxides/sulfides such as NiCoO and *** also designed some hollow structures of carbon and carbon-metal oxide for lithium sulfur batteries.

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Synthesis of Nanostructured Metal Oxide Materials and Their ...

Synthesis of Hollow Nanostructues for Lithium-ion Batteries

中国化学会第29届学术年会

作者： xiong wen（David） lou School of Chemical and Biomedical Engineering Nanyang Technological University

Metal oxides are suggested as promising electrode materials for lithium-ion batteries（LIBs） and supercapacitors. We have employed hydrothermal/solvothermal methods to synthesize a wide range of new metal oxide based nanomaterials, and investigated their potential applications as electrode materials for LIBs and supercapacitors. In this talk, I will briefly discuss three types of metal oxides based on three different lithium storage mechanisms.（i） Specifically, we have synthesized hollow SnO2 nanostructures by both templating and template-free methods, and further engineered them into SnO2-carbon composite hollow structures to achieve significantly improved lithium storage properties.（ii） We also try to improve the lithium insertion properties of TiO2 by engineering the crystal facets in view of the fact that lithium insertion in TiO2 is anisotropic. In particular, anatase TiO2 in the form of nanosheet with exposed（001） facets is an ideal host structure for this purpose.（iii） We have also demonstrated the concept for conversion reaction compounds（e.g., Fe2O3） showing that the cycling performance can be improved by creating a porous/hollow structure. Lastly, I will briefly talk about some of our most recent works about mixed metal oxide materials for LIBs and supercapacitors.

关键词： Metal Oxide Hollow Structures Lithium ion batteries Supercapacitors

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Synthesis of Hollow Nanostructues for Lithium-ion Batteries

Lagrangian coherent structure analysis on transport of Acetes chinensis along coast of Lianyungang,China

中国化学会第29届学术年会

作者： xiong wen（David）lou School of Chemical and Biomedical Engineering Nanyang Technological University

Hollow nanostructures are promising as electrode materials for lithium-ion batteries（LIBs）. We have employed hydrothermal/solvothermal methods to synthesize hollow nanostructures of different materials, and investigated their lithium storage properties. In this talk, I will briefly discuss hollow nanostructures of metal oxides. We have been able to synthesize different hollow nanostructures of many binary metal oxides such as SnO2, Fe2O3 and Fe3O4, and more recently mixed metal oxides. I will also talk about integration of oxide and different carbon materials to further improve their lithium storage properties.

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Journal of Oceanology and Limnology 2024年第1期42卷 345-359页

作者： Kexin WANG Xueqing ZHANG Qi lou Xusheng XIANG Ying xiong College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China Key Laboratory of Marine Environment and Ecology Ministry of Education of ChinaOcean University of ChinaQingdao 266100China Jiangsu Marine Fisheries Research Institute Nantong 226007China

Spatial heterogeneity or“patchiness”of plankton distributions in the ocean has always been an attractive and challenging scientific issue to *** focused on the accumulation and dynamic mechanism of the Acetes chinensis in the Lianyungang nearshore licensed fishing *** Lagrangian frame approaches including the Lagrangian coherent structures theory,Lagrangian residual current,and Lagrangian particle-tracking model were applied to find the transport pathways and aggregation characteristics of Acetes *** exist some material transport pathways for Acetes chinensis passing through the licensed fishing area,and Acetes chinensis is easy to accumulate in the licensed fishing *** main mechanism forming this distribution pattern is the local circulation induced by the nonlinear interaction of topography and tidal *** the Lagrangian coherent structure analysis and the particle trajectory tracking indicate that Acetes chinensis in the licensed fishing area come from the nearshore *** work contributed to the adjustment of licensed fishing area and the efficient utilization of fishery resources.

关键词： plankton accumulation hydrodynamic model Lagrangian particle-tracking model Lagrangian analysis

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Orbit and clock products for quad-system satellites with undifferenced ambiguity fixing approach

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Satellite Navigation 2024年第1期5卷 125-139页

作者： Jiaqi Wu Xingxing Li Yongqiang Yuan Keke Zhang Xin Li Jiaqing lou Yun xiong School of Geodesy and Geomatics Wuhan University129 Luoyu RoadWuhan430079China Hubei Luojia Laboratory 129 Luoyu RoadWuhan430079China German Research Centre for Geosciences GFZ Telegrafenberg14473PotsdamGermany Technische Universitat Berlin(TUB) Straße Des 17.Juni10623BerlinGermany

Integer Ambiguity Resolution(IAR)can significantly improve the accuracy of GNSS Precise Orbit Determination(POD).Traditionally,the IAR in POD is achieved at the Double Differenced(DD)*** this contribution,we develop an Un-Differenced(UD)IAR method for Global Positioning System(GPS)+BeiDou Navigation Satellite System(BDS)+Galileo navigation satellite system(Galileo)+Global'naya Navigatsionnaya Sputnikovaya Sistema(GLONASS)quad-system POD by calibrating UD ambiguities in the raw carrier phase and generating the so-called carrier *** on this method,we generate the UD ambiguity-fixed orbit and clock products for the Wuhan Innovation Application Center(IAC)of the International GNSS Monitoring and Assessment System(iGMAS).One-year observations in 2020 from 150 stations are employed to investigate performance of orbit and clock ***,the UD Ambiguity Resolution(AR)yields more resolved integer ambiguities than the traditional DD AR,scaling up to 9%,attributable to its avoidance of station baseline *** from the removal of ambiguity parameters,the computational efficiency of parameter estimation undergoes a substantial 70%*** with the float solution,the orbit consistencies of UD AR solution achieve the accuracy of 1.9,5.2,2.8,2.1,and 2.7 cm for GPS,BeiDou-2 Navigation Satellite System(BDS-2),BeiDou-3 Navigation Satellite System(BDS-3),Galileo,and GLONASS satellites respectively,reflecting enhancements of 40%,24%,54%,34%,and 42%.Moreover,the standard deviations of Satellite Laser Ranging(SLR)residuals are spanning 2.5–3.5 cm,underscoring a comparable accuracy to the DD AR solution,with discrepancies below 5%.A notable advantage of UD AR lies in its capability to produce the Integer Recovered Clock(IRC),facilitating Precise Point Positioning(PPP)AR without requiring additional Uncalibrated Phase Delay(UPD)*** assess the performance of quad-system kinematic PPP based on IRC,a network comprising 120 stations is uti

关键词： Multi-GNSS Precise orbit determination Integer recover clock Undifferenced ambiguity resolution iGMAS innovation application center

Regulation of AMPK activation by extracellular matrix stiffness in pancreatic cancer

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Genes & Diseases 2024年第3期11卷 338-350页

作者： Xin Xu Yuan Fang Somaira Nowsheen Ye-xiong Li Zhenkun lou Min Deng State Key Laboratory of Molecular Oncology and Department of Radiation Oncology National Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100021China Department of General Surgery Shanghai General HospitalShanghai Jiaotong University School of MedicineShanghai 200080China Department of General Surgery Zhongshan HospitalFudan UniversityShanghai 200032China Department of Dermatology University of California San DiegoSan DiegoCA 92093USA Department of Oncology Mayo ClinicRochesterMN 55905USA

The adenosine monophosphate(AMP)-activated protein kinase(AMPK)sits at a cen-tral node in the regulation of energy metabolism and tumor *** is best known to sense high cellular ADP or AMP levels,which indicate the depletion of energy *** studies have shown that the low expression of phosphorylated AMPK is associated with a poor prognosis of pancreatic *** this study,we report that AMPK is also highly sensitive to extracellular matrix(ECM)*** found that AMPK is activated in cells when cultured under low ECM stiffness conditions and is functionally required for the metabolic switch induced by ECM *** regulation of AMPK requires the Hippo kinases but not LKB1/*** kinases directly phosphorylate AMPKa at Thr172 to activate AMPK at low ECM ***,we found AMPK activity is inhibited in patients with pancreatic ductal adenocarcinoma(PDAC)with high ECM stiffness and is associated with a poor survival *** activation of Hippo kinases by ROCK inhibitor Y-27632 in combination with the mitochondrial inhibitor metformin synergistically activates AMPK and dramatically inhibits PDAC ***,these findings establish a novel model for AMPK regulation by the mechanical properties of ECMs and provide a rationale for simultaneously targeting the ECM stiffness-Hippo kinases-AMPK signaling and low glucose-LKB1-AMPK signaling pathways as an effective therapeutic strategy against PDAC.

关键词： AMPKactivity Cellularmetabolic switch ECM stiffness Hippokinase signaling Pancreaticductal adenocarcinoma

Determinants of saturation magnetic flux density in Fe-based metallic glasses: insights from machine-learning models

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Rare Metals 2024年第10期43卷 5256-5267页

作者： Jie xiong Bo-wen Bai Hao-Ran Jiang Angeles Faus-Golfe Materials Genome Institute Shanghai University Institute of Special Environments Physical Sciences Harbin Institute of Technology Laboratoire de Physique des 2 Infinis Irene Joliot-Curie (IJCLab) CNRS-IN2P3Universite′Paris-Saclay

Fe-based metallic glasses have garnered significant attention due to their low coercivity force and core loss. Enhancing the saturation magnetic flux density(Bs) of Fe-based metallic glasses is crucial for their industry applications. This work constructed a dataset comprising330 training data and 157 test data. The support vector regression model surpassed the tree-based ensemble models in the test set and demonstrated comparable accuracy to the tree-based ensemble models in the training set. Additionally, we proposed an indicator for Bsbased on symbolic regression. This newly proposed indicator exhibits a Pearson correlation coefficient exceeding 0.92 with Bs. The present work provides a simple and accurate formula for predicting the Bsof Fe-based amorphous alloys, demonstrating the effectiveness of machine learning approaches in discovering novel soft magnetic materials.

关键词： Fe-based metallic glasses Machine learning Saturation magnetic flux density Symbolic regression