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Surface yttrium-doping induced by element segregation to suppress oxygen release in Li-rich layered oxide cathodes

Tungsten 2022年第4期4卷 336-345页

作者： Si-Yu liu Yu-Huan Zhou Yi-Bin Zhang Sheng-Jie Xia Ying Li Xin Zhou Bao Qiu Guang-Jie Shao zhao-ping liu Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo315201China College of Environmental and Chemical Engineering State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao066004China University of Chinese Academy of Sciences Beijing100049China Science and Chemical Engineering Ningbo UniversityNingbo315211China College of Chemical Engineering Zhejiang University of TechnologyHangzhou310014China

Doping electrochemically inert elements in Li-rich layered oxide cathodes usually stabilizes the structure to improve electrochemical performance at the expense of available ***,we use an element segregation principle to realize a uniform surface doping without capacity *** the basis of Hume-Rothery rule,element yttrium is chosen as a candidate dopant to spontaneously segregate at particle surface due to mismatched ionic *** with X-ray photoelectron spectroscopy and electron energy loss spectroscopy mapping,yttrium is demonstrated uniformly distributed on particle *** importantly,a significant alleviation of oxygen release after surface doping is detected by operando differential electrochemical mass *** a result,the modified sample exhibits improved reversibility of oxygen redox with 82.1%coulombic efficiency and excellent cycle performances with 84.15%capacity retention after 140 *** analysis by transmission electron microscopy,Raman spectroscopy and X-ray diffraction reveal that the modified sample maintains the layered structure without a significant structure transformation after long *** work provides an effective strategy with a series of elements to meet the industrial application.

关键词： Li-ion batteries Cathode materials Li-rich layered oxides Surface doping

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Privacy-Preserving Consensus-Based Distributed Economic Dispatch of Smart Grids via State Decomposition

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IEEE/CAA Journal of Automatica Sinica 2024年第5期11卷 1250-1261页

作者： Wei Chen Guo-ping liu The authors are with the Center for Control Science and Technology Southern University of Science and TechnologyShenzhen 518055China

This paper studies the privacy-preserving distributed economic dispatch(DED)problem of smart *** autonomous consensus-based algorithm is developed via local data exchange with neighboring nodes,which covers both the islanded mode and the grid-connected mode of smart *** prevent power-sensitive information from being disclosed,a privacy-preserving mechanism is integrated into the proposed DED algorithm by randomly decomposing the state into two parts,where only partial data is *** objective is to develop a privacy-preserving DED algorithm to achieve optimal power dispatch with the lowest generation cost under physical constraints while preventing sensitive information from being *** this end,a comprehensive analysis framework is established to ensure that the proposed algorithm can converge to the optimal solution of the concerned optimization problem by means of the consensus theory and the eigenvalue perturbation *** particular,the proposed autonomous algorithm can achieve a smooth transition between the islanded mode and the grid-connected ***,rigorous analysis is given to show privacy-preserving performance against internal and external ***,case studies illustrate the feasibility and validity of the developed algorithm.

关键词： preserving autonomous mode

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Energy Absorption by 3D-Printed Mesh Structures with a Negative Poisson’s Ratio

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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 205-212页

作者： Wenyu Li Weiming Yang Mingze Li Xiang Zhang ping Zhang Yucheng zhao Peijian Chen Haishun liu School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhou221116China School of Materials Sciences and Physics China University of Mining and TechnologyXuzhou221116China

A negative Poisson's ratio(NPR)structure represents optimal impact-resistance with applications in various fields,including the crash box in vehicles,which absorbs impact kinetic *** crash box is designed to deform in response to impact,increasing local structural density,which enhances impact resistance *** studies have only focused on the NPR effect in the plane dimension at low-speed *** studies have considered high-speed impact loads on three-dimensional NPR *** have developed two types of AlSi10Mg alloy energy-absorbing structures with NPR using three-dimensional printing technology,and have compared our systems with a conventional hexagonal mesh *** testing involved split-Hopkinson pressure bar measurements,which showed good agreement with dynamic numerical *** subjected to an impact load,the NPR structure exhibited better impact resistance and energy absorption compared with the positive Poisson's ratio *** proposed dual-layer hexagonal structure ensures an NPR effect while exhibiting higher strength and improved stability relative to the conventional concave hexagon structure.

关键词： Negative Poisson’s ratio Energy absorption 3D printing Split-Hopkinson pressure bar Numerical simulation

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High-nitrogen and low-irradiance can restrict energy utilization in photosynthesis of successional tree species in low subtropical forest

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Science China(Life Sciences) 2008年第7期51卷 592-603页

作者： CAI Xi’An,SUN GuChou,zhao ping &liu XiaoJing South China Institute of Botany,Chinese Academy of Sciences,Guangzhou 510650,China South China Institute of Botany Chinese Academy of Sciences Guangzhou China

Responses of photosynthesis and the partition of energy utilization to high-nitrogen importation and high-light intensity in leaves of three dominant tree species of subtropical forest,including sun plant or early-successional species Schima superba,mesophyte or intermediate-successional species Canstanopsis hystrix,and shading-tolerant plant or late-successional species Cryptocarya concinna were studied by using the CO2 exchange system and chlorophyll fluorescence *** results showed that,regardless of plant species,net photosynthetic rate(Pn)was higher in high-nitrogen supply and high irradiance(HNHL)plants than in low-nitrogen supply and high irradiance(LNHL)plants,implying that low-nitrogen importation would limit Pn of plants grown under high ***, high-nitrogen supply and low irradiance(HNLL)plants had a lower *** change of quantum yield(Fv′/Fm′)in opened PS II was found in leaves of HNHL,LNHL or HNLL plants of *** and C. hystrix,while a higher Fv′/Fm′occurred in HNHL plants of *** in comparison with LNHL or HNLL *** HNHL plants of *** also had a higher photochemical quantum yield(△F/Fm′) than LNHL or HNLL plants,however no similar responses were found in plants of *** and C. hystrix(P0.05)and it was significantly higher than in HNLL plants(P<0.05).*** also had a similar response inφ PSII to nitrogen supply and *** of species HNLL plants had a significantφ PSII and higher heat dissipation in light,and this effect was more severe in *** than in *** or *** results may mean that high-nitrogen importation by nitrogen deposit and low irradiance caused by changing climate or air pollution would more severely restrict photosynthetic processes in the late-succ

关键词： low subtropical forest successional plant high nitrogen concentration partition of photosynthetic energy

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Super-high bed sintering for iron ores:behaviors,causes and solutions of horizontal segregation on strand

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Journal of Iron and Steel Research International 2024年第7期31卷 1590-1596页

作者： Liang-ping Xu Hui-bo liu Zhong-lin Dong Qiang Zhong Yu-chao zhao Guang-hui Li School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083HunanChina

Horizontal segregation has been a constraint to the development and application of super-high bed *** eliminate the horizontal segregation of super-high bed sintering,several typical sintering machines were sampled and analyzed,and theoretical calculation was made to compare the bed depth and their differences in different areas within the mixture ***,solutions were proposed and applied to a 265 m^(2) sintering *** results showed that the horizontal seg-regation of the 265 m^(2) sintering machine was dominated by particles larger than 8 mm with horizontal segregation degree of 0.48,while 360 and 550 m^(2) sintering machines were affected by 5-8 mm and 1-3 mm particles with horizontal segregation degree of 0.27 and 0.31,*** analysis indicated the different segregation distribution results from the matching of the bed depth of each area within the mixture ***,the horizontal segregation degree not larger than 0.06 was achieved by optimizing the time parameters and the division of three zones on the 265 m^(2) sintering machine.

关键词： Super-high bed sintering Horizontal segregation Feeder Particle distribution Agglomeration

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An investigation into hearing loss among patients of 50 years or older

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Journal of Otology 2011年第1期6卷 44-49页

作者： JI Fei LEI Lei zhao Su-ping liu Ke-fang ZHOU Qi-you YANG Shi-ming Department of Otolaryngology/ Head and Neck Surgery Chinese PLA Institute of Otolaryngology Chinese PLA General Hospital 28 Fuxing Road Beijing 100853 China

Objects To investigate the extent of hearing loss in an elderly sample population to estimate hearing disorders among the age-equivalent population in China and to study primary clinical characteristics of presbycusis. Methods Clinical data from 110 hearing loss patients of both senium and pre-senium ages （95 males and 15 females, mean age = 74.4±12.1 years） were reviewed. Patients aged from 50 to 59 years were accepted as the pre-seni- um control group （n=15）. The 95 senium patients （〉 60 years of age） were divided into 4 groups according to age： 60＋ group（60 to 69 years, n=25）, 70＋ group （70 to79 years, n=26）, 80＋ group （80 to 89 years, n=32） and 90＋ group （90 years or older, n=12）. Pure tone audiometry thresholds were measured in all 110 patients. Hearing loss severity of each tested ear was rated according to the Goodman classification criteria. Besides, audiometric configuration was examined in each ear. Results Audiometric testing showed normal hearing in 65 ears （29.5%）, slight to moderately severe hearing loss in 131 ears （59.5%）, and severe and profound loss in 24 ears （11%）. Air-bone gaps were found in 12 ears （5.45%） indicating conductive hearing loss. Except the 12 ears with conductive hearing loss, audiograms showed gradually sloping loss in 99 ears （45%）, sharply sloping loss in 34 ears （15.45%）, fiat loss in 45 ears （20.45%）, notch pattern loss in 5 ears（2.27%）, trough and rising pattern loss in 2 ears（0.91%）, total deafness in 2 ears （0.91%）, and normal hearing in 21 ears（9.55%）. On average, hearing thresholds increased at a rate of approximately 10 dB per 10 year for subjects aged 60 and older. Conclusions Hearing thresholds tend to be stable in presbycusis patients aged from 50 to 70 years, increase significantly between 70 and 80 years of age, and reach another stable stage at high levels after 80 years of age, especially in high frequencies. Hearing loss in middle frequencies accounts for most of recession in loudness perception.

关键词： elderly presbycusis hearing loss

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Super-high bed sintering for iron ores:problems ascertainment

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Journal of Iron and Steel Research International 2024年第5期31卷 1063-1070页

作者： Liang-ping Xu Hui-bo liu Yu-chao zhao Qiang Zhong Zhong-lin Dong Guang-hui Li Tao Jiang School of Minerals Processing and Bioengineering Central South UniversityChangsha410083HunanChina

Super-high bed sintering process is an important development direction of iron ore sintering for its lower emission and higher ***,there is a lack of deep understanding of the uneven quality of super-high bed sintering products,and the deterioration of reduction disintegration performance,the thickening of hearth layer and the reduction in energy-saving effect are perplexing enterprises and *** ascertain the problems of super-high bed sintering,ten sintering machines with the areas of 265,280,360,550 and 660 m^(2)and bed depth above 900 mm were sampled and *** results showed that problems were mainly shown in the unevenness of chemical composition,macrostructure,mechanical strength and metallurgical *** chemical composition exhibits severe segregation in both horizontal and vertical directions,with basicity segregation reaching as high as *** uneven macrostructure of sinter is reflected in a 10%difference in porosity and mechanical strength increase in 16%–19%along the vertical *** reducibility and reduction disintegration performance gradually deteriorate along the bed depth,with a difference of 10.5%in reducibility and 7.3%in RDI−0.5 mm(reduction disintegration index of sinter with size smaller than 0.5 mm).

关键词： Super-high bed sintering Uneven sinter performance Segregation Agglomeration Iron ore

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Cyclic Pulsating Pressure Enhanced Segregating Structuration of Ultra-High Molecular Weight Polyethylene/Graphene Composites as High-performance Light-Weight EMI Shields

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Chinese Journal of Polymer Science 2024年第7期42卷 958-967,I0008页

作者： Yun-Zhi Huang Xiao-Xiao liu Lan-Wei Li Guang-Ming Huang zhao-Xia Huang Jin-ping Qu National Engineering Research Center of Novel Equipment for Polymer Processing Key Laboratory of Polymer Processing EngineeringMinistry of EducationGuangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced ManufacturingSchool of Mechanical and Automotive EngineeringSouth China University of TechnologyGuangzhou 510641China School of Advanced Manufacturing Technology Guangdong Mechanical&Electrical PolytechnicGuangzhou 510550China

Currently,the enhancement in electromagnetic interference(EMI)performance of polymeric composite generally relies on either improving electrical conductivity(σ)for stronger electromagnetic(EM)reflections or tailoring structure for higher EM ***,we proposed a novel technique called cyclic pulsating pressure enhanced segregating structuration(CPP-SS),which can reinforce these two factors *** structural information was supplied by optical microscopy(OM)and scanning electron microscopy(SEM),both of which confirmed the formation and evolution of segregate structured ultra-high molecular weight polyethylene(UHMWPE)/graphene ***,the result showed that CPP-SS can significantly improve theσof ***,advanced specific EMI shielding efficiency of 31.1 d B/mm was achieved for UHMWPE/graphene composite at 1-mm thickness and a low graphene loading of 5 wt%.Meanwhile,it also confirmed that the intrinsic disadvantage of poor mechanical properties of conventional segregated structure composites can be *** work is believed to provide a fundamental understanding of the structural and performance evolutions of segregated structured composites prepared under CPPSS,and to bring us a simple and efficient approach for fabricating high-performance,strong and light-weight polymeric EMI shields.

关键词： Cyclic pulsating pressure Segregated structure Ultra-high molecular weight polyethylene Graphene Electromagnetic interface

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The Effect and Mechanism of Fructus lycii on Improvement of Exercise Fatigue Using a Network Pharmacological Approach with in vitro Experimental Verification

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Biomedical and Environmental Sciences 2024年第1期37卷 42-53页

作者： JI Xiao Ning liu zhao ping ZHANG Chao Zheng CHEN Min LIANG Jiang LU Jiang ZHANG Lei National Resource Center for Chinese Materia Medica China Academy of Chinese Medical SciencesBeijing 100700China China National Center for Food Safety Risk Assessment Beijing 100022China Chinese Center for Disease Control and Prevention Beijing 102206China

Objective This study aimed to investigate the effect and underlying mechanism of Fructus lycii in improving exercise *** A network pharmacological approach was used to explore potential mechanisms of action of Fructus *** muscle C2C12 cells and immunofluorescence were employed to verify the effect and mechanism of the representative components in Fructus lycii predicted by network pharmacological *** Six potential active components,namely quercetin,β-sitosterol,stigmasterol,7-Omethylluteolin-6-C-beta-glucoside_qt,atropine,and glycitein,were identified to have potency in improving exercise fatigue via multiple pathways,such as the PI3K-Akt,neuroactive ligand-receptor interaction,IL-17,TNF,and MAPK signaling *** immunofluorescence results indicated that quercetin,a significant active component in Fructus lycii,increased the mean staining area of 2-NBDG,TMRM,and MitoTracker,and decreased the area of CellRox compared to the ***,the protein expression levels of p-38 MAPK,p-MAPK,p-JNK,p-PI3K,and p-AKT markedly increased after quercetin *** Fructus lycii might alleviate exercise fatigue through multiple components and *** these,quercetin appears to improve exercise fatigue by enhancing energy metabolism and reducing oxidative *** PI3K-AKT and MAPK signaling pathways also appear to play a role in this process.

关键词： Fructus lycii Exercise fatigue Network pharmacology

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Estrogen Receptor α and β Expressions in Hypothalamus-pituitary-ovary Axis in Rats Exposed Lactationally to Soy Isoflavones and Bisphenol A

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Biomedical and Environmental Sciences 2010年第5期23卷 357-362页

作者： BO YU QING-FENG CHEN zhao-ping liu HE-FEI XU XIAO-PENG ZHANG QAIN XIANG WEN-ZHONG ZHANG WEN-MING CUI XIN ZHANG NING LI National Institute of Nutrition and Food Safety Chinese Center for Disease Control and Prevention7 Panjiayuan NanliBeijing 100021China The Affiliated Hospital of Medical College Qingdao UniversityQingdao 266003ShandongChina Shandong Entry-Exit Inspection and Quarantine Bureau China

Objectives This paper aims to investigate the uterotrophic activities of lactational exposure to combination of soy isoflavones （SIF） and bisphenol A （BPA） and to examine estrogen receptor α （ERα） and estrogen receptor β （ERβ） expressions in hypothalamus-pituitary-ovary axis and *** Maternal rats that were breeding about 8 litters were randomly divided into four groups with seven dams in each *** in different treatment groups received corn oil （control）,150 mg/kg BW of SIF,150 mg/kg BW of BPA or combination of 150 mg/kg BW of SIF and 150 mg/kg BW of BPA,respectively,from postnatal day 5 to 11 （PND5-11） by *** PND12 and PND70,10 female litters were killed and hypothalamus,pituitary,ovary and uterus were ***α and ERβ expressions in these organs were detected with Western blotting *** vaginal opening time and estrus cycle were examined in animals fed for *** On PND12,the relative uterine weight of rats treated with ISF or BPA or their combination was significantly higher than that of untreated rats （P〈0.05）.But the relative uterine weight of rats in the co-exposure group was slightly lower than that in the group only exposed to SIF or *** PND 70,however,the relative uterine weight in each treatment group was not statistically different from that in the control group （P〈0.05）.Vaginal opening time and estrus cycle in groups treated with SIF or BPA or their combination were similar to those in the control group （P〈0.05）.Exposure to SIF or BPA or their combination could up-regulate or down-regulate ERα and ERβ expressions in hypothalamus,pituitary,ovary and uterus on PND12 and *** regulation patterns for ERα and ERβ were different in different organs at different time *** Lactational exposure to ISF or BPA or their combination could induce uterotrophic responses in neonate rats,which disappeared in later *** these data fail to suggest a possibility for synergic actions between SIF and *** was

关键词： Soy isoflavones Bisphenol A Combinatory actions Estrogen receptors

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