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Enhanced energy density in polyetherimide nanocomposite film at high temperature induced by electrospun BaZrTiO_(3) nanofibers

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Rare Metals 2023年第6期42卷 1912-1922页

作者： Ming-zhi Fan Bin-Zhou Sun Jian-yong Jiang Jia-Yu Pan Peng-hao Hu Research Center for New Energy Composite Materials Foshan(Southern China)Institute for New MaterialsFoshan528200China Research Center for New Functional Composites Wuzhen LaboratoryTongxiang314500China

Polymer dielectrics which possess excellent dielectric properties such as high breakdown strength,flexibility,and facile processability are considered as promising materials for advanced electrostatic ***,most dielectric polymers have unsatisfactory energy storage performances at high-temperature ***,polyetherimide(PEI) nanocomposite films contained with electrospun Ba(Zr_(0.79)Ti_(0.21))O_(3) nanofibers(BZTNFs) are fabricated by common solution casting *** dielectric properties,especially the breakdown strength of the BZTNFs/PEI nanocomposites,are characterized,yet improvement is only in the small loading *** energy storage performance of the 0.5 vol% and1.0 vol% BZTNFs content nanocomposite is further investigated from 25 to 150℃.With the introduction of small loading BZTNFs,the dielectric permittivity and electric displacement of the nanocomposite are improved at all evaluated *** 1.0 vol% BZTNFs/PEI possesses a maximal discharged energy density of6.05 J·cm^(-3) with high efficiency of 94.9% at 25℃,then falls to 3.34 J·cm^(-3) with efficiency of 54.6% at 150℃ for the larger remnant ***,the relaxation ferroelectric nanofller of BZTNFs is much effective in increasing the dielectric permittivity of nanocomposite,but its capacity to restrict the migration of the charge carriers at high temperatures is weaker than that of the nanofillers with wider *** complementation of both kinds of the nanofillers probably provides an approach to available high-temperature dielectric films.

关键词： Energy density Polyetherimide(PEI) Nanocomposite film High temperature Electrospun nanofibers

A Novel Bat Algorithm based on Cross Boundary Learning and Uniform Explosion Strategy

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Applied Mathematics(A Journal of Chinese Universities) 2019年第4期34卷 480-502页

作者： yong Jia-shi HE Fa-zhi LI hao-ran ZHOU Wei-qing School of Computer Science Wuhan UniversityWuhan 430072China State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China

Population-based algorithms have been used in many real-world *** algorithm(BA)is one of the states of the art of these *** of the super bat,on the one hand,BA can converge quickly;on the other hand,it is easy to fall into local ***,for typical BA algorithms,the ability of exploration and exploitation is not strong enough and it is hard to find a precise *** this paper,we propose a novel bat algorithm based on cross boundary learning(CBL)and uniform explosion strategy(UES),namely BABLUE in short,to avoid the above contradiction and achieve both fast convergence and high *** from previous opposition-based learning,the proposed CBL can expand the search area of population and then maintain the ability of global exploration in the process of fast *** order to enhance the ability of local exploitation of the proposed algorithm,we propose UES,which can achieve almost the same search precise as that of firework explosion algorithm but consume less computation *** is tested with numerous experiments on unimodal,multimodal,one-dimensional,high-dimensional and discrete problems,and then compared with other typical intelligent optimization *** results show that the proposed algorithm outperforms other algorithms.

关键词： Optimization Bat algorithm Cross boundary learning Uniform explosion strategy

Dissection of voltage-gated sodium channels in developing cochlear sensory epithelia

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Protein & Cell 2015年第6期6卷 458-462页

作者： You Zhou Fang-hao Fang zhi-Rui Liu yong-Hua Ji Laboratory of Neuropharmacology and Neurotoxicology ShanghaiUniversity Shanghai 200436 China

Dear Editor Hair cells （HCs） clustered produce spontaneous spike n cochlear sensory epithelia and evoked action potentials during the developmental stage of auditory, which rely on many ion channels, such as Ca2＋ channels, K＋ channels and Na＋ channels （Housley et al., 2006; Marcotti et al., 2003）. As the dominant molecule acting in action potentials in most of excitable cells, Na＋ channels （VGSCs） were deemed to be indispensable in the spontaneous and evoked action po- tentials of HCs （Marcotti et al., 2003）.

关键词： voltage-gated sodium developing cochlear sensory epithelia

Pyridocarbazole alkaloids from Ochrosia borbonica: lipid-lowering agents inhibit the cell proliferation and adipogenesis of 3T3-L1 adipocyte via intercalating into supercoiled DNA

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Chinese Journal of Natural Medicines 2019年第9期17卷 663-671页

作者： XU Yao-hao LI Wei RAO yong HUANG zhi-Shu YIN Sheng Guangdong Provincial Key Laboratory of New Drug Design and Evaluation School of Pharmaceutical Sciences Sun Yat-sen University

Bioassay-guided fractionation of an ethanolic extract of Ochrosia borbonica led to the isolation of two known pyridocarbazole alkaloids,ellipticine(1)and 9-methoxyellipticine(2),and six known monoterpenoid indole alkaloids(3-8).Lipid-lowering assay in 3 T3-L1 cell model revealed that 1 and 2 could significantly inhibit the lipid droplet formation(EC50(28)0.41 and 0.92μmol·L^–1,respectively)and lower triglyceride levels by 50%-60%at the concentration of 1μmol·L^–1,being more potent than the positive drug luteolin(EC50(28)2.63μmol·L–^1).A mechanistic study indicated that 1 and 2 could intercalate into supercoiled DNA,which consequently inhibited the mitotic clonal expansion of 3 T3-L1 cells at the early differentiation phase,leading to the retardance of following adipogenesis and *** findings suggest that 1 and 2 may serve as promising leads for further d evelopment of anti-obesity drugs.

关键词： Ochrosia borbonica Pyridocarbazole alkaloids Lipid-lowering agents

Lamellar morphology of directional solidified Ti–45Al–6Nb–xW alloys

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Rare Metals 2016年第1期35卷 65-69页

作者： zhi-Yuan Hou yong-Sheng Li hao-Jie Mei Kai Hu Guang Chen School of Materials Science and Engineering Nanjing University of Science and Technology Engineering Research Center of Materials Behavior and Design Ministry of Education

Directional solidification of Ti-45Al-6Nb-xW（x=0,0.4,0.8;at%） alloys was performed by Bridgeman method with the stable growth rate of 5,10,and 20 μm·s^（-1）.The differential scanning calorimeter（DSC） results indicate that both the eutectic temperature and the transition temperature of α（Ti_3Al） to γ（TiAl） increase with W content increasing from 0 at%to 0.8 at%.For the stable growth rate of 10 μm·s^（-1）,the orientations of α_2（Ti_3Al）/γ（TiAl）lamellae change from 45°（0 at%W） to 0° and near 0°（0.4at%and 0.8 at%W） to the crystal growth direction,and the spacing of α_2/γ lamellae decreases with W content increasing from 0 at%to 0.4 at%,while it increases when W content is 0.8 at%.With the increase in growth rate from5 to 10 and 20 μm·s^（-1）,the lamellar spacing of α_2/γbecomes smaller,and the lamellar thickness becomes more uniform.

关键词： Ti-Al-Nb--W alloy Directionalsolidification Lamellar morphology Lamellar spacing

Diagnosing anomalous characteristics of atmospheric water cycle structure during seasonal-scale drought events:A case study in middle and lower reaches of Yangtze River

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Water Science and Engineering 2022年第2期15卷 103-113页

作者： Hai He Rui Cao zhi-yong Wu Yuan Li hao Yin Fei Yuan College of Hydrology and Water Resources Hohai UniversityNanjing 210098China

Anomalous characteristics of the atmospheric water cycle structure are highly significant to the mechanisms of seasonal-scale meteorological *** also play an important role in the identification of indicative predictors of *** better understand the causes of seasonal meteorological droughts in the middle and lower reaches of the Yangtze River(MLRYR),characteristics of the atmospheric water cycle structure at different drought stages were determined using standardized *** results showed that the total column water vapor(TCWV)was anomalously low during drought occurrence *** contrast,there were no anomalous signals at the drought persistence and recovery stages in the ***,there was no significant temporal correlation between the TCWV anomaly and seasonal-scale drought index(the 3-month standardized precipitation index(SPI_(3))).During drought events,water vapor that mainly originated from the Bay of Bengal was transported southwest of the ***,the anomalous signal of water vapor transport was negative at the drought appearance *** the drought persistence stage,the negative anomalous signal was the most *** vapor flux divergence in the MLRYR showed significant positive anomalous signals during drought events,and the signal intensity shifted from an increasing to a decreasing trend at different drought *** addition,a significant positive correlation existed between the anomaly of water vapor flux divergence and regional SPI_(3).Overall,water vapor flux divergence is more predictive of droughts in the MLRYR.

关键词： Water vapor transport Water vapor flux divergence Standardized anomalies Seasonal-scale drought process Middle and lower reaches of Yangtze River

SiS_(2)/ZnO范德华异质结光催化水分解第一性原理研究

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原子与分子物理学报 2025年第6期42卷 31-36页

作者：李家豪黄欣杨志红南京邮电大学电子与光学工程学院、柔性电子(未来技术)学院南京210023 南京邮电大学理学院南京210023

基于第一性原理方法,研究了SiS_(2)/ZnO范德华异质结的电子结构和光催化性质.结果表明,SiS_(2)/ZnO异质结是带隙值为1.32 eV的半导体材料,表现出交错排列的能带结构.在异质结界面处,形成了从ZnO指向SiS_(2)的内置电场,该内置电场的存在... 详细信息

基于第一性原理方法,研究了SiS_(2)/ZnO范德华异质结的电子结构和光催化性质.结果表明,SiS_(2)/ZnO异质结是带隙值为1.32 eV的半导体材料,表现出交错排列的能带结构.在异质结界面处,形成了从ZnO指向SiS_(2)的内置电场,该内置电场的存在使得SiS_(2)/ZnO异质结中形成了特殊的“Z-型”载流子迁移模式,有利于电子空穴对的有效分离,同时增强了载流子的氧化还原能力.异质结构具有良好的热力学稳定性,且带边位置跨越水的氧化还原电位.与单层材料相比,SiS_(2)/ZnO异质结光吸收谱出现红移现象,表现出更宽的光吸收范围(从可见光到紫外光)及更强的光吸收强度(达到10~5 cm^(-1)量级).另外,通过施加双轴应变,可以有效调控SiS_(2)/ZnO异质结的带隙值.以上结果表明SiS_(2)/ZnO异质结有潜力成为新型光催化剂用于全解水.

关键词： SiS_(2)/ZnO Z-型范德华异质结光催化电子结构第一性原理

Analysis and optimization of high-power pulse transformer for SXFEL

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Nuclear Science and Techniques 2019年第7期30卷 47-53页

作者： yong-Fang Liu Hiroshi Matsumoto Ming Gu Xiao-Xuan Zhou yong-Hua Wu zhi-hao Chen Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China University of Chinese Academy of Sciences Beijing 100049 China High Energy Accelerator Research Organization Tsukuba Ibaraki 3050801 Japan Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201412 China

A C-band accelerator structure was used to accelerate electrons at the Shanghai soft X-ray free-electron laser test facility (SXFEL-TF) in Shanghai Institute of Applied Physics (SINAP). The microwave system of this accelerator structure used a 110 MW pulse modulator and a klystron (PV-5050) to provide the power supply. A pulse transformer is a crucial device in a modulator klystron system and plays significant roles in voltage level transformation, matching impedances, and polarity inversion. This study presents the optimization of a high-voltage pulse transformer. The design considerations of reducing flattop ringing and flattop droop, and shortening leading edge are provided. The model simulation, mechanical design, and the relevant experimental results are also presented.

关键词： Pulse transformer Pulse modulator Flattop droop Leading edge Flattop ringing

P-symmetric Subharmonic Solutions for Nonlinear Hamiltonian Systems

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Acta Mathematica Sinica,English Series 2024年第6期40卷 1388-1408页

作者： Duan zhi ZHANG zhi hao Zhao School of Mathematical Sciences Nankai UniversityTianjin 300071P.R.China

In this paper,we prove that for each positive k≡1 mod m there exists a P-symmetric kmτ-periodic solution xk for asymptotically linear mτ-periodic Hamiltonian systems,which are nonautonomous and endowed with a *** the P-symmetric Hamiltonian function is semi-positive,one can prove,under a new iteration inequality of the Maslov-type P-index,that xk_(1) and xk_(2) are geometrically distinct for k_(1)/k_(2)≥(2n+1)m+1;and xk_(1),xk_(2) are geometrically distinct for k_(1)/k_(2)≥m+1 provided xk_(1) is non-degenerate.

关键词： P-symmetric subharmonic Hamiltonian systems Maslov-type index theory iteration inequality asymptotically linear