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Engineering polarization surface of hierarchical ZnO microspheres via spray-annealing strategy for wide-frequency electromagnetic wave absorption

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Journal of Materials Science & Technology 2022年第36期131卷 231-239页

作者： Lei Wang Mengqiu Huang xuefeng yu Wenbin You Biao Zhao Chongyun Liang Xianhu Liu xuefeng Zhang Renchao Che Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsDepartment of Materials ScienceFudan UniversityShanghai 200438China Department of Chemistry Fudan UniversityShanghai 200433China Joint-Research Center for Computational Materials Zhejiang LaboratoryHangzhou 311100China School of Materials Science and Engineering Shanghai Institute of TechnologyShanghai 201418China Key Laboratory of Materials Processing and Mold Zhengzhou UniversityMinistry of EducationZhengzhou 450002China Institute of Advanced Magnetic Materials College of Materials and EnvironmentalEngineeringHangzhou Dianzi UniversityHangzhou 310012China

Regulating orientation growth plays a dominant role in enhancing dielectric properties for the electromagnetic(EM)functional materials,which faces a huge challenge in the synthesis *** sprayannealing strategy,hierarchical ZnO microspheres assembled by ZnO nanorods and nanoparticles were successfully *** confined microsphere space and controlling crystal growth,oriented ZnO nanorods possess rich defects,Zn-polar,O-polar faces,and high ***,temperaturedependency of exposed polarization surfaces is discovered in the semiconductor ZnO nanoparticles with evolved aspect *** pure dielectric EM wave absorption material,the hierarchical ZnO microsphere exhibits adjustable complex permittivity and polarization *** the thickness is 2.4 mm,the hierarchical ZnO-1 absorber shows the widest efficient absorption(RL≤–10 d B)region from 9.9 to18.0 GHz(8.1 GHz,^50.6%testing frequency).The minimum reflection loss(RL)of ZnO-1 can reach–31.5 d B at only 2.0 *** of the outstanding dielectric loss ability and wide absorption frequency,large-scale hierarchical ZnO microspheres can be a potential EM absorption candidate.

关键词： ZnO microspheres Spray drying Electromagnetic wave absorption Orientated polarization Dielectric loss

A comparative study of n-alkane biomarker and pollen records: an example from southern China

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Chinese Science Bulletin 2009年第6期54卷 1065-1072页

作者： ZHENG YanHong ZHOU WeiJian XIE ShuCheng yu xuefeng State Key Laboratory of Continental Dynamics Department of Geology Northwest University Xi'an 710069 China State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi'an 710075 China Key Laboratory of Biogeology and Environment Geology of Ministry of Education China University of Geosciences Wuhan 430074 China

We report the results of a comparative study of n-alkane biomarkers and pollens in lacustrine and peat deposits at Dingnan, Jiangxi Province in southern China, and discuss the likely causes for the dis-crepancy in the interpretations of the n-alkane biomarker and pollen records in terms of climate and vegetation change. The results show that past changes in climate and vegetation revealed by the n-alkane record are not always consistent with the pollen assemblage record in the whole section. Biomarkers do not permit direct identification of the plant family and/or genus and mainly record compositions of local plant remains, while pollens mainly reflect the regional vegetation change. Bio-markers and pollen records complement each other, providing a better picture of local and regional environments. Furthermore, biomarkers are more sensitive than pollen to climatic and vegetational change. Several climatic events are clearly identified by the n-alkane biomarker proxies, such as C31/(C27+C29+C 31) ratio and can be correlated to the North Atlantic Heinrich event, B/A, YD and two dry-cool events during the early Holocene such as the periods of 9850 to 9585 cal a B.P. and 8590 to 7920 cal a B.P. These events are consistent with those found in the surrounding regions, suggesting that the regional climate was coupled with global-scale abrupt climatic events. Our results suggest that biomarker and pollen data can record the more detailed climate and vegetation information, thus im-proving the resolution and precision of vegetation and climate reconstruction.

关键词：烷烃生物标志物花粉记录华南地区植被变化气候条件个例气候事件孢粉组合

A local high-resolution deformation model of soft tissue based on element-free Galerkin method

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High Technology Letters 2019年第3期25卷 245-254页

作者： Zhang Xiaorui yu xuefeng Sun Wei Zhu Lifeng Liu Jia Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science&TechnologyNanjing 210044P.R.China Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CICAEET) Nanjing University of Information Science&TechnologyNanjing 210044P.R.China School of Instrument Science and Engineering Southeast UniversityNanjing 210096P.R.China

In order to solve the problem that the existing meshless models are of high computational complexity and are difficult to express the biomechanical characteristics of real soft tissue, a local high-resolution deformation model of soft tissue based on element-free Galerkin method is proposed. The proposed model applies an element-free Galerkin method to establish the model, and integrates Kelvin viscoelastic model and adjustment function to simulate nonlinear viscoelasticity of soft tissue. Meanwhile, a local high-resolution algorithm is applied to sample and render the deformed region of the model to reduce the computational complexity. To verify the effectiveness of the model,liver and brain tumor deformation simulation experiments are carried out. The experimental results show that compared with the existing meshless models, the proposed model well reflects the biomechanical characteristics of soft tissue, and is of high authenticity, which can provide better visual feedback to users while reducing computational cost.

关键词： meshless model Kelvin model local high-resolution virtual surgery soft tissue deformation

Efficacy of Xixiancao (Herba Siegesbeckiae Orientalis) on interactions between nuclear factor kappa-B and inflammatory cytokines in inflammatory reactions of rat synovial cells induced by sodium urate

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Journal of Traditional Chinese Medicine 2020年第5期40卷 774-781页

作者： Wang Zixuan Fan Xiangwei Xu Yier Chen Kaiyun yu xuefeng Sun Guicai the Fourth Clinical Medicine College Nanchang UniversityNanchang 330003China Department of the Orthopaedic the Fourth Affiliated Hospital of Nanchang UniversityNanchang 330003China Institute of Medicine Harbin Pharmaceutical Group Co.Harbin 150000China Department of the Drug Clinical Trial Office The Fourth Affiliated Hospital of Nanchang UniversityNanchang 330003China the Fourth Affiliated Hospital of Nanchang University Nanchang 330003China the First Affiliated Hospital of Nanchang University Nanchang 330000China

OBJECTIVE:To investigate the interaction between nuclear factor kappa-B(NF-κB)and inflammatory cytokines in synovial cell inflammatory responses induced by sodium urate,and to evaluate the efficacy of Xixiancao(Herba Siegesbeckiae Orientalis)on these ***:The interactions between NF-κB and inflammatory cytokines/mediators in synovial cells in acute gouty arthritis were *** observed the expressions of NF-κB,interleukin(IL)-1β,IL-8,and tumor necrosis factor alpha(TNF-α)in synovial cells at different timepoints in an in vitro model of synovial cell inflammatory responses induced by sodium urate and in an in vivo model of gouty *** in the expressions of NF-κB,IL-1β,IL-8,and TNF-αin synovial cells of all experimental groups were compared and observed after treatment with different doses of Xixiancao(Herba Siegesbeckiae Orientalis)and *** interactions between NF-κB and IL-1β,IL-8,and TNF-αwere *** changes in synovial tissues were observed in rats with acute gouty ***:Compared with the blank group,the expression levels of NF-κB,IL-1β,IL-8,and TNF-αwere increased significantly at different timepoints in the in vitro model of synovial cell inflammatory responses induced by sodium urate,and in the in vivo model of gouty *** with the model group,the expressions of NF-κB,IL-1β,IL-8,and TNF-αin synovial cells induced by sodium urate were decreased in the different Xixiancao(Herba Siegesbeckiae Orientalis)dose groups and the colchicine *** effect was more obvious in the high dose Xixiancao(Herba Siegesbeckiae Orientalis)*** expression of NF-κB in synovial cells was positively correlated with the expressions of IL-1β,IL-8,and TNF-α.Histopathological examination of synovial tissues in the high dose Xixiancao(Herba Siegesbeckiae Orientalis)group and Colchicine group showed that the characteristics of acute gouty arthritis were reduced,and there was a trend towards a positi

关键词： Arthritis,gouty NF-kappa B Cytokines Xixiancao(Herba Siegesbeckiae Orientalis)

Editing the Shape Morphing of Monocomponent Natural Polysaccharide Hydrogel Films

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Research 2021年第1期2021卷 835-846页

作者： Hao Hu Chao Huang Massimiliano Galluzzi Qiang Ye Rui Xiao xuefeng yu Xuemin Du Institute of Biomedical&Health Engineering Shenzhen Institute of Advanced Technology(SIAT)Chinese Academy of Sciences(CAS)Shenzhen 518035China Key Laboratory of Polymeric Materials and Application Technology of Hunan Province Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of EducationSchool of ChemistryXiangtan UniversityXiangtan 411105China Institute of Advanced Materials Science and Engineering Shenzhen Institute of Advanced Technology(SIAT)Chinese Academy of Sciences(CAS)Shenzhen 518035China State Key Laboratory of Fluid Power&Mechatronic System Key Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceDepartment of Engineering MechanicsZhejiang UniversityHangzhou 310027China

Shape-morphing hydrogels can be widely used to develop artificial muscles,reconfigurable biodevices,and soft ***,conventional approaches for developing shape-morphing hydrogels highly rely on composite materials or complex manufacturing techniques,which limit their practical ***,we develop an unprecedented strategy to edit the shape morphing of monocomponent natural polysaccharide hydrogel films via integrating gradient cross-linking density and geometry *** to the synergistic effect,the shape morphing of chitosan(CS)hydrogel films with gradient cross-linking density can be facilely edited by changing their geometries(length-to-width ratios or thicknesses).Therefore,helix,short-side rolling,and longside rolling can be easily ***,various complex artificial 3D deformations such as artificial claw,horn,and flower can also be obtained by combining various flat CS hydrogel films with different geometries into one system,which can further demonstrate various shape transformations as triggered by *** work offers a simple strategy to construct a monocomponent hydrogel with geometry-directing programmable deformations,which provides universal insights into the design of shape-morphing polymers and will promote their applications in biodevices and soft robotics.

关键词： effect linking geometry

Dopant-Controlled Synthesis of Water-Soluble Hexagonal NaYF_(4) Nanorods with Efficient Upconversion Fluorescence for Multicolor Bioimaging

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Nano Research 2010年第1期3卷 51-60页

作者： xuefeng yu Min Li Mengyin Xie Liangdong Chen Yan Li Ququan Wang Key Laboratory of Acoustic and Photonic Materials and Devices of Ministry of Education Wuhan UniversityWuhan 430072China Department of Oncology Zhongnan Hospital of Wuhan UniversityHubei Key Laboratory of Tumor Biological BehaviorsWuhan 430071China

A novel strategy is proposed to directly synthesize water-soluble hexagonal NaYF4 nanorods by doping rare-earth ions with large ionic radius (such as La^(3+), Ce^(3+), Pr^(3+), Nd^(3+), Sm^(3+), Eu^(3+), and Gd^(3+)), and the dopant- controlled growth mechanism is studied. Based on the doping effect, we fabricated water-soluble hexagonal NaYF4:(Yb,Er)/La and NaYF4:(Yb,Er)/Ce nanorods, which exhibited much brighter upconversion fluorescence than the corresponding cubic forms. The sizes of the nanorods can be adjusted over a broad range by changing the dopant concentration and reaction time. Furthermore, we successfully demonstrated a novel depth-sensitive multicolor bioimaging for in vivo use by employing the as-synthesized NaYF4:(Yb,Er)/La nanorods as probes.

关键词： Crystal growth hexagonal NaYF_(4) nanocrystals fluorescence bioimaging

Effects of three kinds of head acupuncture therapies on regulation of brain microenvironment and rehabilitation of nerve function in rats with cerebral palsy

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Journal of Traditional Chinese Medicine 2021年第2期41卷 276-283页

作者： WANG Zixuan FAN Xiangwei CHEN Kaiyun yu xuefeng GAO Jing The Fourth Clinical Medicine College of Nanchang University Nanchang 330006China Department of the Orthopaedic The Fourth Affiliated Hospital of Nanchang UniversityNanchang 330003China Department of the Drug Clinical Trial Office The Fourth Affiliated Hospital of Nanchang UniversityNanchang 330003China Department of the Orthopaedic The fourth affiliated hospital of Nanchang universityNanchang 330003China Department of Child Rehabilitation Division Huai'an maternal and child care hospital Huai'anJiangsu 223002China

OBJECTIVE:To compare and observe the effects of three kinds of cephalic acupuncture therapies commonly used in the clinic on promoting nerve function rehabilitation in the brain microenvironment of rats with cerebral ***:A negative control group,positive control group,and three cephalic acupuncture groups based on the administration of three cephalic acupuncture therapies were *** experimental rats were selected from each group at 1,2,and 3 weeks after *** function after treatment was rated according to the Basso,Beattie,and Bresnahan *** matter fiber bundles were evaluated by head diffusion tensor *** expression levels of neuron-specific enolase,microtubule-associated protein 2,and myelin basic protein in the brain tissue extract were detected by Western blot analysis and the activities of ATPases were determined using a fixed phosphorus ***:The pathological changes in brain tissue were restored and motor function scores were increased in the mice in each cephalic acupuncture group,and the expression of neuronal growth-related proteins in the brain tissue extract was significantly ***,the activities of ATPases in the lesion area were significant enhanced(P<0.05).Diffusion tensor imaging revealed that the white matter fiber bundles of mice in each cephalic acupuncture group gradually increased and *** nervous system structure was significantly ***:All three acupuncture methods promoted the rehabilitation of nerve function damaged by cerebral *** effects are likely related to the improved expression of nerve growth-related proteins,enhancement of ATPase activities,and regulation of the brain microenvironment.

关键词： cerebral palsy scalp acupuncture adenosine triphosphatases brain microenvironment

Electron-induced damage to NPN transistors under different fluxes

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Nuclear Science and Techniques 2008年第6期19卷 333-336页

作者： ZHENG yuzhan LU Wu REN Diyuan GUO Qi yu xuefeng LU Xiaolong Xinjiang Technical Institute of Physics and Chemistry Chinese Academy of Sciences Urumqi 830011 China Graduate School of Chinese Academy of Sciences Beijing 100049 China

Radiation damage of NPN transistors under different fluxes with electron energy of 1.5 MeV was investigated in this article. It has been shown that when NPN transistors were irradiated to a given fluence at different electron fluxes, the shift of base current was dependent on flux. With electron flux decreasing, the shift of base current becomes larger, while collector current almost keeps constant. Thus, more degradation of NPN transistors could be caused by low-electron-flux irradiation, similar to enhanced low-dose-rate sensitivity (ELDRS) of transistors under 60Co γ-irradiation. Finally, the underlying mechanisms were discussed here.

关键词：电子通量 NPN晶体管辐射损伤核技术

MOF-Derived Ni1-xCox@Carbon with Tunable Nano-Microstructure as Lightweight and Highly Efficient Electromagnetic Wave Absorber

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Nano-Micro Letters 2020年第11期12卷 90-106页

作者： Lei Wang Mengqiu Huang xuefeng yu Wenbin You Jie Zhang Xianhu Liu Min Wang Renchao Che Laboratory of Advanced Materials Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials(iChem)Fudan UniversityShanghai 200438People’s Republic of China Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou 450002People’s Republic of China

Intrinsic electric-magnetic property and special nano-micro architecture of functional materials have a significant effect on its electromagnetic wave energy conversion,especially in the microwave absorption(MA) ***,porous Ni1-xCox@Carbon composites derived from metal-organic framework(MOF)were successfully synthesized via solvothermal reaction and subsequent annealing *** from the coordination,carbonized bimetallic Ni-Co-MOF maintained its initial skeleton and transformed into magnetic-carbon composites with tunable nano-micro *** the thermal decomposition,generated magnetic particles/clusters acted as a catalyst to promote the carbon sp^2 arrangement,forming special core-shell ***,pure Ni@C microspheres displayed strong MA behaviors than other Ni1-xCox@Carbon ***,magnetic-dielectric Ni@C composites possessed the strongest reflection loss value-59.5 dB and the effective absorption frequency covered as wide as 4.7 ***,the MA capacity also can be boosted by adjusting the absorber content from 25% to 40%.Magnetic-dielectric synergy effect of MOF-derived Ni1-xCox@Carbon microspheres was confirmed by the off-axis electron holography technology making a thorough inquiry in the MA mechanism.

关键词： Metal-organic frameworks Polarization Magnetic coupling Microwave absorption Electromagnetic parameters