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Science China Chemistry 2017年第12期60卷 1483-1493页

作者： Enyue Zhao Xiqian Yu fangwei wang Hong Li Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

Lithium-rich cathode oxides with capability to realize multivalent cationic and anionic redox reactions have attracted much attention as promising candidate electrode materials for high energy density lithium ion batteries because of their ultrahigh specific capacity. However, redox reaction mechanisms, especially for the anionic redox reaction of these materials, are still not very clear. Meanwhile, several pivotal challenges associated with the redox reactions mechanisms, such as structural instability and limited cycle life, hinder the practical applications of these high-capacity lithium-rich cathode oxides. Herein, we review the lithium-rich oxides with various crystal structures. The multivalent cationic/anionic redox reaction mechanisms of several representative high capacity lithium-rich cathode oxides are discussed, attempting to understand the origins of the high lithium storage capacities of these materials. In addition, we provide perspectives for the further development of these lithium-rich cathode oxides based on multivalent cationic and anionic redox reactions, focusing on addressing the fundamental problems and promoting their practical applications.

关键词： lithium ion batteries high capacity lithium-rich cathode oxides multivalent cationic redox reaction anionic redox reaction

The cGAS-STING pathway:a therapeutic target in chromosomally unstable cancers

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Signal Transduction and Targeted Therapy 2023年第2期8卷 338-340页

作者： Haiyan Yan Weiguo Lu fangwei wang Key Laboratory of Novel Targets and Drug Study for Neural Repair of Zhejiang Province School of MedicineHangzhou City University310015HangzhouChina Women’s Hospital Zhejiang University School of Medicine310006HangzhouChina Cancer Center Zhejiang University310058HangzhouChina The MOE Key Laboratory of Biosystems Homeostasis&Protection and Zhejiang Provincial Key Laboratory of Cancer Molecular Cell Biology Life Sciences InstituteZhejiang University310058HangzhouChina

In a recent study published in Nature,Hong et *** that the cyclic GMP-AMP synthase(cGAS)-stimulator of interferon genes(STING)innate immune pathway is critically required for the IL-6-dependent survival of chromosomally unstable cancer cells,1 implying that chronic inflammation can be therapeutically targeted to kill cancers displaying chromosomal instability(CIN).

关键词： unstable chromosomal therapeutic

Lowering Sodium-Storage Lattice Strains of Layered Oxide Cathodes by Pushing Charge Transfer on Anions

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Energy & Environmental Materials 2024年第4期7卷 99-106页

作者： Na Li Wen Yin Baotian wang fangwei wang Xiaoling Xiao Jinkui Zhao Enyue Zhao Songshan Lake Materials Laboratory Dongguan 523808China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Spallation Neutron Source Science Center Dongguan 523803China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China College of Materials Science and Opto-electronic Technology Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China

Due to a high energy density,layered transition-metal oxides have gained much attention as the promising sodium-ion batteries ***,they readily suffer from multiple phase transitions during the Na extraction process,resulting in large lattice strains which are the origin of cycledstructure ***,we demonstrate that the Na-storage lattice strains of layered oxides can be reduced by pushing charge transfer on anions(O^(2-)).Specifically,the designed O3-type Ru-based model compound,which shows an increased charge transfer on anions,displays retarded O3-P3-O1 multiple phase transitions and obviously reduced lattice strains upon cycling as directly revealed by a combination of ex situ X-ray absorption spectroscopy,in situ X-ray diffraction and geometric phase ***,the stable Na-storage lattice structure leads to a superior cycling stability with an excellent capacity retention of 84%and ultralow voltage decay of 0.2 mV/cycle after 300 *** broadly,our work highlights an intrinsically structure-regulation strategy to enable a stable cycling structure of layered oxides meanwhile increasing the materials’redox activity and Nadiffusion kinetics.

关键词： anionic redox reaction lattice strains layered oxide cathodes phase transitions sodium-ion battery

Malicious Code Modeling and Analysis in Weighted Scale-Free Networks

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Wuhan University Journal of Natural Sciences 2007年第1期12卷 51-54页

作者： wang Changguang wang fangwei ZHANG Yangkai MA Jianfengi School of Computer Xidian University Xi＇an 710071 ShaanxiChina College of Physics and Information Engineering Hebei NormalUniversity Shijiazhuang 050016 Hebei China Network Center Hebei Normal University Shijiazhuang 050016Hebei China

We study the detailed malicious code propagating process in scale-free networks with link weights that denotes traffic between two nodes. It is found that the propagating velocity reaches a peak rapidly then decays in a power-law form, which is different from the well-known result in unweighted network case. Simulation results show that the nodes with larger strength are preferential to be infected, but the hierarchical dynamics are not clearly found. The simulation results also show that larger dispersion of weight of networks leads to slower propagating, which indicates that malicious code propagates more quickly in unweighted scale-free networks than in weighted scale-free networks under the same condition. These results show that not only the topology of networks but also the link weights affect the malicious propagating process.

关键词： malicious code weighted scale-free networks propagation model

Tuning anionic redox activity to boost high-performance sodium-storage in low-cost Na_(0.67)Fe_(0.5)Mn_(0.5)O_(2) cathode

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Journal of Energy Chemistry 2022年第10期31卷 214-222,I0005页

作者： Jianyue Jiao Kang Wu Na Li Enyue Zhao Wen Yin Zhongbo Hu fangwei wang Jinkui Zhao Xiaoling Xiao College of Materials Science and Opto-electronic Technology Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808GuangdongChina Spallation Neutron Source Science Center Dongguan 523803GuangdongChina Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Na-based layered iron-manganese oxide Na_(0.67)Fe_(0.5)Mn_(0.5)O_(2) containing only low-cost elements is a promising cathode for Na-ion batteries used in large-scale energy storage ***,the poor cycle stability restricts its practical *** capacity decay of Na_(0.67)Fe_(0.6)Mn_(0.5)O_(2) mainly originates from the irreversible anionic redox reaction charge compensation due to the high-level hybridization between oxygen and ***,we rationally design a surface Ti doping strategy to tune the anionic redox reaction activity of Na_(0.67)Fe_(0.5)Mn_(0.5)O_(2) and improve its Na-storage *** doped Ti ions not only enlarge the Na migration spacing layer but also improve the structure stability thanks to the strong Ti-O *** importantly,the d0-shell electronic structure of Ti^(4+) can suppress the charge transfer from the oxidized anions to cations,thus reducing the anionic redox reaction activity and enhancing the reversibility of charge *** modified Na_(0.67)Fe_(0.5)Mn_(0.5)O_(2) cathode shows a reversible capacity of 198 mA h g^(-1) and an increased capacity retention from 15% to 73% after about1 month of ***,a superior Na-ion diffusion kinetics and rate capability are also *** work advances the commercialization process of Na-based layered iron-manganese oxide cathodes;on the other hand,the proposed modification strategy paves the way for the design of high-performance electrode materials relying on anionic redox reactions.

关键词： Na-ion battery P2-Na_(0.67)Fe_(0.5)Mn_(0.5)O_(2) Anionic redox reaction Surface Ti doping

Oxygen vacancy promising highly reversible phase transition in layered cathodes for sodium-ion batteries

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Nano Research 2021年第11期14卷 4100-4106页

作者： Kezhu Jiang Shaohua Guo Wei Kong Pang Xueping Zhang Tiancheng Fang Shao-fei wang fangwei wang Xiaoyu Zhang Ping He Haoshen Zhou Center of Energy Storage Materials&Technology College of Engineering and Applied SciencesNational Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced MicrostructuresJiangsu Key Laboratory of Artificial Functional MaterialsNanjing UniversityNanjing210093China Institute for Superconducting&Electronic Materials School of MechanicalMaterials and Mechatronics EngineeringUniversity of WollongongWollongongNSW2522Australia China Spallatoin Neutron Source Institute of High Energy PhysicsChinese Academy of SciencesDongguan523808China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing101408China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of SciencesBeijing100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing101408China Songshan Lake Materials Laboratory Dongguan523808China School of materials science and engineering Jiangsu UniversityZhenjiang212013China Energy Technology Research Institute National Institute of Advanced Industrial Science and Technology(AIST)Umezono 1-1-1Tsukuba305-8568Japan

Phase transition is common during (de)-intercalating layered sodium oxides, which directly affects the structural stability and electrochemical performance. However, the artificial control of phase transition to achieve advanced sodium-ion batteries is lacking, since the remarkably little is known about the influencing factor relative to the sliding process of transition-metal slabs upon sodium release and uptake of layered oxides. Herein, we for the first time demonstrate the manipulation of oxygen vacancy concentrations in multinary metallic oxides has a significant impact on the reversibility of phase transition, thereby determining the sodium storage performance of cathode materials. Results show that abundant oxygen vacancies intrigue the return of the already slide transition-metal slabs between O_(3) and P_(3) phase transition, in contrast to the few oxygen vacancies and resulted irreversibility. Additionally, the abundant oxygen vacancies enhance the electronic and ionic conductivity of the Na0.9Ni0.3Co0.15Mn0.05Ti0.5O2 electrode, delivering the high initial Coulombic efficiency of 97.1%, large reversible capacity of 112.7 mAh·g−1, superior rate capability upon 100 C and splendid cycling performance over 1,000 cycles. Our findings open up new horizons for artificially manipulating the structural evolution and electrochemical process of layered cathodes, and pave a way in designing advanced sodium-ion batteries.

关键词： sodium-ion battery layered oxide O_(3)phase oxygen vacancy reversible phase transition

Tailoring interphase structure to enable high-rate, durable sodium-ion battery cathode

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Journal of Energy Chemistry 2022年第5期31卷 564-571页

作者： Na Li Shaofei wang Enyue Zhao Wen Yin Zhigang Zhang Kang Wu Juping Xu Yoshihiro Kuroiwa Zhongbo Hu fangwei wang Jinkui Zhao Xiaoling Xiao College of Materials Science and Opto-electronic Technology Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Spallation Neutron Source Science Center Dongguan 523803GuangdongChina Songshan Lake Materials Laboratory Dongguan 523808GuangdongChina Department of Physical Science Hiroshima UniversityHigashihiroshimaHiroshima 739-8526Japan Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Na-based layered transition metal oxides with O_(3)-type structure have been considered to be promising cathodes for Na-ion batteries. However, the intrinsically limited Na-ion conductivity induced by the Otype Na-coordinate environment compromises their rate and cycle capability, hindering their practical application. Here, we report an interphase-structure tailoring strategy that improves the electrochemical properties of O_(3)-type layered cathodes achieved through surface coating and doping ***, a Zr-doped interphase structure is designed in the model compound NaNi_(1/3)Mn_(1/3)Fe_(1/3)O_(2) using the ionic conductor Na_(3)Zr_(2)Si_(2)PO_(12) as the surface coating material and Zr-dopant provider. We discover that the modified NaNi_(1/3)Mn_(1/3)Fe_(1/3)O_(2)cathode shows a stable Na-storage structure as well as an enhanced rate/cycle capability. Combined with theoretical calculations, it is suggested that the superior electrochemical performances originate from the Zr-doped interphase structure, which has an enlarged Na layer spacing that forms favorable Na-ion diffusion channels. This work highlights a general material interface optimization method which opens a new perspective for fabricating high-performance electrodes for Na-ion batteries and beyond.

关键词： Na-ion battery NaNi_(1/3)Mn_(1/3)Fe_(1/3)O_(2)cathode Interphase structure Zr doping Surface interface modification

A homogenized approach to classify advanced gastric cancer patients with limited and adequate number of pathologically examined lymph nodes

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Cancer Communications 2019年第1期39卷 303-313页

作者： Sharvesh Raj Seeruttun Lipu Xu fangwei wang Xiaodong Yi Cheng Fang Zhimin Liu Wei wang Zhiwei Zhou Department of Gastric Surgery State Key Laboratory of Oncology in South ChinaCollaborative Innovation Center for Cancer MedicineSun Yat-sen University Cancer Center651 Dongfeng Road EastGuangzhou 510060GuangdongP.R.China Department of Surgical Oncology Affiliated Lu’an Hospital of Anhui Medical UniversityLu’an 237005AnhuiP.R.China

Background:The prognosis of gastric cancer patients with a limited number of pathologically examined lymph nodes(eLN,<16)is dismal compared to those with adequately eLN(≥16),yet they are still classified within the same subgroups using the American Joint Committee on Cancer(AJCC)staging *** aimed at formulating an easy-to-adopt and clinically reliable stratification approach to homogenize the classification for these two categories of ***:Patients staged according to the 8th AJCC pathological nodal(N)and tumor-node-metastasis(TNM)clas-sification were stratified into a Limited and Adequate eLN cohort based on their number of pathologically examined *** statistical differences between the 5-year overall survival(OS)rates of both cohorts were determined and based on which,patients from the Limited eLN cohort were re-classified to a proposed modified nodal(N′)and TNM(TN′M)classification,by matching their survival rates with those of the Adequate eLN *** prognostic perfor-mance of the N′and TN′M classification was then compared to a formulated lymph-node-ratio-based nodal classifica-tion,in addition to the 8th AJCC N and TNM ***:Significant heterogeneous differences in 5-year OS between patients from the Limited and Adequate eLN cohort of the same nodal subgroups were identified(all P<0.001).However,no significant differences in 5-year OS were observed between the subgroups N0,N1,N2,and N3a of the Limited eLN cohort when compared with N1,N2,N3a,and N3b from the Adequate eLN cohort,respectively(P=0.853,0.476,0.114,and 0.230,respectively).A novel approach was formulated in which only patients from the Limited eLN cohort were re-classified to one higher nodal subgroup,denoted as the N′*** re-classification demonstrated superior stratifying and prognostic ability as compared to the 8th AJCC N and lymph-node-ratio classification(Akaike information criterion values[AIC]:12,276 vs.12,358 vs.12,283,respectively).Th

关键词： Advanced gastric cancer Limited lymph nodes Adequate lymph nodes R0 gastrectomy AJCC Eighth edition Modified classification Akaike information criterion Lymph node ratio Prognosis

CHROMATOGRAPHIC REFOLDING OF PROTEINS:MOLECULAR ACTION AND COLUMN CONTROL

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China Particuology 2005年第6期3卷 337-342页

作者： fangwei wang Yongdong Liu Jing Chen Zhiguo Su Bioscience and Biotechnology Department Dalian University of TechnologyDalian 116024P.R.China National Key Laboratory of Biochemical Engineering Institute of Process EngineeningChinese Academy of SciencesBeijing 100080P.R.China

Protein expression in E coil often results in the formation of a kind of protein aggregate called inclusion body Conversion of the inactive protein aggregate into biologically active protein is a key step in production of recombinant products Convenlional dilution refolding technique suffers from disadvantages of low recovery and low concentration Various chromatographic refolding techniques have been developed over the last few years These include size-exclusion chromatography, ion exchange chromatography, hydrophobic interaction chromatography and different affinity chromatography. A successful strategy is the use of gradient elution in column control which provides a gentle and gradual change of the solution environment for the macromolecule to rsfold at nano-scale, The gradient refolding at column scale could minimize misfolding and aggregation which are induced by sudden change of the solution in conventional refolding operation.

关键词： protein refolding size-exclusion chromatography ion exchange chromatography hydrophobic interaction chromatography affinity chromatography

Physical design of target station and neutron instruments for China Spallation Neutron Source

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Science China(Physics,Mechanics & Astronomy) 2013年第12期56卷 2410-2424页

作者： wang fangwei LIANG TianJiao YIN Wen YU QuanZhi HE LunHua TAO JuZhou ZHU Tao JIA XueJun ZHANG ShaoYing Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences Dongguan Branch Institute of High Energy PhysicsChinese Academy of Sciences

The China Spallation Neutron Source(CSNS)is the first accelerator-based multidiscipline user facility to produce pulsed neutrons by tungsten target under collision of a pulsed proton beam with a beam power of 100 kW at a repetition rate of 25 *** this paper,we focus on the physical design of CSNS target station and neutron *** optimized design,the flat tungsten target and the compact target-moderator-reflector coupling enhance effective cold and thermal neutron output from *** wing-type moderators supply four different characteristics of neutrons to 19 beamlines primarily for neutron scattering *** of neutron instruments are conceptually planned for total 20 beamlines,the configuration and specification have been determined for three day-one neutron *** designs are optimized for the Phase I of 100 kW with a upgradable capacity to 500 kW.

关键词： neutron scattering spallation neutron source neutron diffraction neutron shielding