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A novel method to prepare metal oxide electrode:Spin-coating with thermal decomposition

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Chinese Chemical Letters 2011年第3期22卷 354-357页

作者： Hao Xu wei yan Cheng li Tang Department of Environmental Science and Technology Xi'an Jiaotong University Xi'an 710049 China

In this work,we propose a new spin-coating method coupling with high thermal decomposition,to prepare the tin-antimony（Sn-Sb） oxide *** character of the spin-coating electrode was compared with the dip-coating electrode through X-ray diffraction（XRD）,scanning electron microscopy（SEM）,accelerated life test,cyclic voltammetry,and electrolytic degradability. The results showed that the spin-coating electrode had a better defined crystal form,a smoother and more compact surface than that of the dip-coating *** time of the spin-coating electrode was determined to be longer than 15 h,and it was less than 2 min for the dip-coating *** characterization analysis showed that the electrolytic degradability of the spin-coating electrode is better than that of the dip-coating electrode.

关键词： Spin-coating Dip-coating Thermal decomposition Electro properties

Radar target recognition based on micro-Doppler effect

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Optoelectronics Letters 2008年第6期4卷 456-459页

作者： DONG wei-guang li yan-jun College of Astronautics Northwestern Polytechnical University Xi ＇an 710072 China

Mechanical vibration of target structures will modulate the phase function of radar backscattering,and will induce the frequency modulation of returned signals from the target. It generates a side bands of the target body Doppler frequency shift,which is helpful for target recognition. Based on this,a micro-Doppler atomic storehouse is built for the target recognition,and four kinds of common classifiers are used separately to perform the classified recognition. The simulation experimental results show that this method has high recognition rate above 90%.

关键词：雷达目标显微多普勒效应信息处理后向散射

Trajectories of oxygen saturation within 6–72 hours after birth in neonates at moderate altitude:a prospective longitudinal cohort study

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World Journal of Pediatrics 2023年第9期19卷 894-901页

作者： Qu‑Ming Zhao Hong‑yan Chen Shi‑Xiu li wei‑li yan Xiao‑Jing Hu Guo‑Ying Huang Children’s Hospital of Fudan University National Children’s Medical Center399 Wan Yuan RoadShanghai 201102China Shanghai Key Laboratory of Birth Defects 399 Wan Yuan RoadShanghai 201102China Luchun County People’s Hospital LuchunChina Research Unit of Early Intervention of Genetically Related Childhood Cardiovascular Diseases(2018RU002) Chinese Academy of Medical SciencesShanghaiChina

Trajectories of pulse oxygen saturation(SpO_(2))within the first few days after birth are important to inform the strategy for identifying asymptomatic hypoxemic disease but remain poorly substantiated at higher *** We performed a longitudinal cohort study with consecutive neonates at a local hospital in Luchun County,China,at an altitude of 1650 m between January and July *** repeatedly measured the pre-and post-ductal SpO_(2)values at 6,12,18,24,36,48,and 72 hours after birth for neonates without oxygen *** neonates underwent echocardiography and were followed up to 42 days after *** included neonates without hypoxemic diseases to characterize the trajectories of SpO_(2)over time using a linear mixed *** considered the 2.5th percentile as the reference value to define hypoxemic *** A total of 1061 neonates were ***-five had non-cardiac hypoxemic diseases,with 84%(21/25)presenting with abnormal SpO_(2)within 24 *** had tetralogy of Fallot identified by *** the 1035 asymptomatic neonates,SpO_(2)values declined from 6 hours after birth,reached a nadir at 48 hours,and tended to level off thereafter,with identical patterns for both pre-and post-ductal SpO_(2).The reference percentile was 92%for both pre-and post-ductal SpO_(2)and was time *** A decline within 48 hours features SpO_(2)trajectories within the first 72 hours at moderate *** findings suggest that earlier screening may favorably achieve a benefit–risk balance in identifying asymptomatic hypoxemic diseases in this population.

关键词： Critical congenital heart disease Hypoxemic disease Pulse oximetry screening Pulse oxygen saturation

LH Plays a Role to Enhance the Nuclear and Cytoplasm Synchronization During In vitro Maturation of Ovine Oocytes

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Agricultural Sciences in China 2011年第1期10卷 136-141页

作者： li Kai NI He-min liU Yun-hai ZHAO yan-wei QU yang-yan li Xiao-yan GUO Yong Department of Animal Science ＆ Technology Beijing University o[ Agriculture Beijing 102206 P.R.China

This study is aimed to investigate the effect of luteinizing hormone （LH） on maturation and fertilization in vitro of ovine oocytes. The ovine oocytes were cultured in vitro in medium with or without LH, and then checked by confocal laser scanning microscope to observe the distribution of cortical granules stained with FITC-LCA during different maturation periods. Similarly, some in vitro matured oocytes were also fertilized in vitro for analysis of their developmental potentiality further. After being cultured in vitro for 4 h, there were significant differences about the rate of germinal vesicle break down （GVBD） between the treatment （with LH） and the control groups （without any hormones）（36.76% vs 18%, P〈0.05）. Further, there were also significant differences of the cleavage and blastocyst rates between these two groups （67.15% vs 42.37%, 21.9% vs 12.71%, P〈0.05, respectively）. The distribution of cortical granules appeared to spread from the edges to the central site of sheep oocytes following their delaying durations of maturation in vitro. It can be concluded that LH may play a role to delay the occurence of GVBD, prolong the maturation duration of cytoplasm, and enhance the nuclear and cytoplasm synchronization of ovine oocytes matured in vitro and finally improve their in vitro developmental potentiality.

关键词： ovine oocyte luteinizing hormone in vitro maturation in vitro fertilization distribution of cortical granules

A Modeling Method for Transformer Windings Under VFTO Based on S-parameters

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高电压技术 2008年第9期34卷 1898-1904页

作者： ZHANG Ping WANG You-hua NIE Xin peng yan wei-li ZHANG Hai-jiao Electrical Department Hebei University of Technology Tianjin 300130 China Baoding Tianwei Group Baoding 071051 China

To study the Very Fast Transient Over-voltage (VFTO) distribution in transformer windings in gas insulated substation (GIS), a systematic methodology based on S-parameters is presented for establishing high-frequency model of transformer windings. Firstly, voltage transfer functions are derived from S-parameters which are calculated or measured from transformer windings. Secondly, voltage transfer functions are fitted with rational functions by the vector fitting method and then the rational transfer functions are order-reduced by optimal Pade-approximation algorithm. Lastly, the resultant voltage transfer functions are synthesized by network technology. Computational results are consistent with simulation results of Electromagnetic Transient Program (EMTP) and confirm the feasibility and validity of proposed methodology.

关键词：过电压瞬变电流变压器绕组电压转移法

Controllable construction of yolk–shell Sn–Co@void@C and its advantages in Na-ion storage

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Rare Metals 2021年第9期40卷 2392-2401页

作者： Shuang liu Xin-Ze li Bin Huang Jian-Wen yang Quan-Qi Chen yan-wei li Shun-Hua Xiao Guangxi Key Laboratory of Electrochemical and Magneto-Chemical Functional Materials College of Chemistry and BioengineeringGuilin University of TechnologyGuilin 541004China

In the family of anodes for sodium-ion batteries,alloy-type anodes possess higher theoretical specific capacity than carbon anodes. The theoretical specific capacity of metallic Sn is 847 mAh·g^(-1). However, the tinbased material undergoes a large volume expansion during the sodium-ion intercalation process, which leads to the crack and pulverization of the electrode, consequently resulting in a significant capacity loss. In this paper, a yolk–shell-structured Sn–Co@void@C composite composed of a Sn–Co alloy core, a carbon shell and void space between the core and shell is designed and *** with the carbon-encapsulated SnCo without void space(Sn–Co@C) and carbon-encapsulated pure Sn core shell with void space(Sn@void@C), this composite exhibits improved reversibility, cyclic performance and rate capability. This work highlights the important roles of Co in the alloy and the void space between the core and the shell. The former can not only buffer the volume expansion of Sn, but also act as an electrical conductor. The void space can further tolerate the volume expansion of the Sn–Co core. Owing to this unique microstructure, the Sn–Co@void@C composite shows an initial reversible capacity of 591.4 mAh·g^(-1), at a current density of50 mA·g^(-1). After 100 charge/discharge cycles at100 mA·g^(-1), the composite still delivers 330 mAh·g^(-1).

关键词： Nanocomposites Yolk-shell structure Tin-based alloys Anodes Sodium-ion batteries

Effect of senescence marker protein 30 on the proliferation and apoptosis of human lens epithelial cells SRA01/04

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International Journal of Ophthalmology(English edition) 2018年第4期11卷 553-558页

作者： Xi Chen Song-Man li yan-wei li Zi-Hao Han Hao liang Department of Ophthalmology the First Affiliated Hospital of Guangxi Medical University

AIM： To study the effect of senescence marker protein 30（SMP30） on the proliferation and apoptosis of human lens epithelial cell（HLEC） SRA01/***： SMP30 overexpression（OE） and knock down（KD） type cell lines were cultivated by using two groups regucalcin（RGN; SMP30） lentiviral vectors（LVRGN, LV-RGN-RNAi） and the respective negative control virus infect SRA01/04 cells. Western blot and real-time quantitative polymerase chain reaction（q-PCR） analysis were used to determine RGN overexpression and knock down efficiency. We use cell counting kit-8（CCK8） assay to measure cell viability and 5-bromodeoxyuridine（Brd U） assay to test cell proliferation. Cell cycle was measured by PI FACS assay and cell apoptosis was tested by Annexin V-APC assay through flow cytometry. We use Western blot to measure the content of caspase-3 in SRA01/***： We used PCR and Western blot techniques to determine the successful transfection of SMP30 OE and KD SRA01/04 cell lines. By CCK8, Brdu and PI FACS cell cycle assay, it was found that the SMP30 OE group promoted cell proliferation（P〈0.05） compared with the control group, and the KD group inhibited cell proliferation（P〈0.05）. The results of Annexin V-APC signal staining detection indicated that compared with respective control group, the cell apoptosis rate was higher in KD group（P〈0.05） but lower in OE group（P〈0.01）. The expression of caspase-3 was down-regulated in OE group through Western blot assay and up-regulated in KD group compared with respective control group. CONCLUSION： Proliferation of SRA01/04 was promoted by SMP30 OE and apoptosis was suppressed. Increasing the expression of SMP30 may protect HLEC SRA01/04 against apoptosis in cataract.

关键词： senescence marker protein 30 cell proliferation apoptosis human lens epithelial cell SRA01/04

Toward superior lithium/sodium storage performance: design and construction of novel TiO_(2)-based anode materials

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Rare Metals 2021年第11期40卷 3049-3075页

作者： Pan-Pan Peng Yu-Rong Wu Xue-Zhong li Jun-Hong Zhang yan-wei li Ping Cui Ting-Feng Yi School of Materials Science and Engineering Northeastern UniversityShenyang 110819China School of Chemistry and Chemical Engineering Anhui University of TechnologyMaanshan 243002China Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology College of Chemistry and Chemical EngineeringLiaocheng UniversityLiaocheng 252059China Department of Materials Science and Engineering University of WashingtonSeattleWA 98195USA Guangxi Key Laboratory of Electrochemical and Magneto-Chemical Function Materials College of Chemistry and BioengineeringGuilin University of TechnologyGuilin 541004China

TiO_(2)-based materials have been considered as one of most promising alternatives for high-performance li(Na)-ion batteries because of the low cost,simple composition,easy synthesis,good environmental protection,excellent safety and relatively high specific ***,the inferior electronic conductivity and poor ion diffusion coefficients are the biggest bottlenecks that restrict the popular *** effort has been focused on resolving these problems toward large-scale applications,and numerous significant advances have been *** the present work,a comprehensive overview of structure characteristics,electrochemical reaction mechanism and modification strategies of TiO_(2)-based materials was *** recent advances of various efficient ways for improving conductivity,li(Na)storage capacity,rate capability and cycle stability are systematically summarized,including surface engineering,constructing composite and element doping,*** TiO_(2)-based materials with novel porous heterogeneous core-shell structures have been regarded as one of the most effective ways to resolve these ***,the future research directions and development prospects of TiO_(2)-based anode materials used in the manufacture of high-performance li(Na)-ion batteries are *** review can provide important comprehension for the construction and optimization of highperformance of TiO_(2)-based anode materials.

关键词： TiO_(2) Anode material li-ion battery Na-ion battery Electrochemical performance

Study on parameters of L-[1-^(13)C]phenylalanine breath test for quantitative assessment of liver function in healthy subjects and patients with hepatitis B virus-related liver disease

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Nuclear Science and Techniques 2005年第5期16卷 293-298页

作者： yan wei-li liN Xiang-Tong JIANG Yi-Bin SUN Su SUN Da-Yu Department of Nuclear Medicine Department of Gastroenterology Huashan Hospital Fudan University Shanghai 200040

The aims of this study are to investigate the feasibility and validity of the L-[1-13C] phenylalanine breath test (13C-PheBT) which has been used to measure hepatocyte functional capacity in hepatitis B virus-related liver disease patients and to propose validity parameters of the test in 12 healthy volunteer, 8 chronic hepatitis and 26 liver cirrhotic patients. 100mg/body nonradiative L-[1-13C] phenylalanine (13C-Phe) was administered orally to all subjects. Breath samples were taken before and different intervals within 360 min after administration. The 13CO2/12CO2 en-richment was assessed by isotope ratio mass spectrometer. The parameter percentage 13C excretion rate 13CERt (% 13C dose/h) all peaked within 10-30 min after oral 13C-Phe application. The parameters such as maximum value of 13C excretion rate,13CERmax (% 13C dose/h) (controls: 18.0±3.3; Child A: 11.0±3.8; Child B: 5.0±0.5; Child C: 3.6±1.2), 13C excretion rate at 30min, 13CER30 (% dose/h) (controls: 11. 9±2.1; Child A: 8.1±0.4; Child B: 6.1±0.9; Child C: 3.2±1.2), 13C cumulative excretion of first 60 min, 13Ccum60 (% 13C dose) (controls: 9.3±1.4; Child A: 6.6±0.7; Child B: 4.1±0.3; Child C: 2.6±0.9) and half time of 13C excretion rate, T1/2 (minutes) (controls: 40.4±4.4; chronic hepatitis: 53.4±4.4; Child A: 59.8±4.5; Child B: 102.0±17.3; Child C: 212.1±87.9) were effective indexes which could be employed to stage hepatocyte impairment and liver functional reserve of advanced HBV-related cirrhotic patients (i.e. healthy subjects, Child A, B, C); T1/2 was also useful for distinguishing mild HBV-related liver injure.

关键词：肝硬化苯基丙氨酸肝炎呼吸方式放射性医学