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Microstructure design of advanced magnesium-air battery anodes

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Journal of Magnesium and Alloys 2024年第2期12卷 443-464页

作者： Xu Huang qingwei Dai Qing Xiang Na yang Gaopeng Zhang Ao Shen Wanming Li School of Metallurgy and Materials Engineering Chongqing University of Science and TechnologyChongqing 401331China School of Materials and Architectural Engineering Guizhou Normal UniversityGuiyang 550025China School of Material and Metallurgy University of Science and Technology LiaoningAnshan 114051China

Metal-air battery is an environmental friendly energy storage system with unique open ***(Mg)and its alloys have been extensively attempted as anodes for air batteries due to high theoretical energy density,low cost,and ***,the study on Mg-air battery(MAB)is still at the laboratory level currently,mainly owing to the low anodic efficiency caused by the poor corrosion *** order to reduce corrosion losses and achieve optimal utilization efficiency of Mg anode,the design strategies are reviewed from microstructure ***,the corrosion behaviors have been discussed,especially the negative difference effect derived by hydrogen *** attention is given to the effect of anode micro-structures on the MAB,which includes grain size,grain orientation,second phases,crystal structure,twins,and *** further improvement,the discharge performance,long period stacking ordered phase and its enhancing effect are ***,given the current debates over Mg dendrites,the potential risk,the impact on discharge,and the elimination strategies are *** control and single crystal would be promising ways for MAB anode.

关键词： Magnesium Air battery Anode Microstructure Anodic efficiency

出血性脑卒中患者血清PDGF-D GDF-15及D-二聚体水平与颅内血肿扩大的相关性

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中国实用神经疾病杂志 2024年第7期27卷 793-797页

作者：翁磊华陈星宇阳清伟陈中杰陈良义厦门大学附属中山医院福建厦门361004

目的分析血清血小板源性生长因子-D(PDGF-D)、生长分化因子-15(GDF-15)及D-二聚体与出血性脑卒中患者血肿扩大的相关性。方法选取2021-01-2023-01厦门大学附属中山医院神经内科诊治的出血性脑卒中患者197例,根据颅内血肿是否扩大分为血... 详细信息

目的分析血清血小板源性生长因子-D(PDGF-D)、生长分化因子-15(GDF-15)及D-二聚体与出血性脑卒中患者血肿扩大的相关性。方法选取2021-01-2023-01厦门大学附属中山医院神经内科诊治的出血性脑卒中患者197例,根据颅内血肿是否扩大分为血肿未扩大组(119例)和血肿扩大组(78例),收集患者基线临床资料。利用酶联免疫吸附试验(ELISA)检测血清PDGF-D和GDF-15水平,采用凝血仪检测血清D-二聚体水平。比较2组患者入院时血肿量(V1)和复查时血肿量(V2),计算V2/V1比值。采用Logistic回归分析颅内血肿扩大的独立危险因素。结果与血肿未扩大组相比,血肿扩大组收缩压[(158.17±21.73)mmHg比(164.82±22.94)mmHg,P<0.05]、舒张压[(97.31±8.93)mmHg比(101.36±9.55)mmHg,P<0.05]、GCS评分[(13.52±1.31)分比(11.78±1.14)分,P<0.05]和血清PDGF-D[(498.73±40.32)ng/L比(596.91±45.82)ng/L,P<0.05]、GDF-15[(728.49±76.71)ng/L比(832.38±86.25)ng/L,P<0.05]、D-二聚体[(1.63±0.10)mg/L比(1.84±0.23)mg/L,P<0.05]水平及V2[(20.53±4.72)cm^(3)比(29.47±5.13)cm3,P<0.05]、V2/V1比值(1.04±0.31比1.42±0.43,P<0.05)均更高。Logistic回归分析显示,PDGF-D、GDF-15、D-二聚体、收缩压、舒张压及GCS评分均为出血性脑卒中患者发生颅内血肿扩大的独立危险因素(分别为OR=1.798、1.672、1.616、1.592、1.583、1.738,P<0.05)。结论血清PDGF-D、GDF-15及D-二聚体水平在发生颅内血肿扩大的出血性脑卒中患者中升高,均为血肿扩大的独立危险因素。

关键词：出血性脑卒中血肿扩大血小板源性生长因子-D 生长分化因子-15 D-二聚体血清

2018-2021年云南省蒙自市居民死因监测结果分析

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公共卫生与预防医学 2024年第5期35卷 81-84页

作者：金彩娥张燕梅杨庆伟王鹏王益民兰州大学公共卫生学院营养与食品卫生学研究所甘肃兰州730000 云南省蒙自市疾病预防控制中心云南红河州661100

目的分析蒙自市居民的死亡率及其变化趋势、死因构成及顺位,为进一步开展疾病预防与控制工作提供依据。方法收集2018—2021年蒙自市的全死因数据,对其死亡率、期望寿命、去死因期望寿命及寿命损失情况进行回顾性分析。拟合Joinpoint回... 详细信息

目的分析蒙自市居民的死亡率及其变化趋势、死因构成及顺位,为进一步开展疾病预防与控制工作提供依据。方法收集2018—2021年蒙自市的全死因数据,对其死亡率、期望寿命、去死因期望寿命及寿命损失情况进行回顾性分析。拟合Joinpoint回归模型分析年度变化百分比(APC),描述死亡趋势变化。结果居民的粗死亡率为633.88/10万,年龄标化死亡率为866.87/10万,粗死亡率及标化死亡率均呈显著下降趋势(APC=-1.73%,APC=-5.96%,P<0.05)。因慢性非传染性疾病(简称慢性病)而死亡者占死亡总数的76.44%。脑血管疾病(140.38/10万)、心脏病(104.24/10万)、恶性肿瘤(92.75/10万)、伤害(79.37/10万)、呼吸系统疾病(63.17/10万)依次为该市居民的前5位死因,占全部死因的75.71%。全人群、男性及女性的人均期望寿命分别为75.67岁、72.32岁和79.49岁。伤害、恶性肿瘤及脑血管疾病造成的潜在寿命损失年占全死因的65.45%。结论慢性病是蒙自市的防治工作重点。尤其应重点关注伤害、恶性肿瘤及脑血管疾病造成的健康损害及寿命损失。

关键词：死因死亡率趋势期望寿命慢性非传染性疾病寿命损失

Development of a real-time magnetic island reconstruction system based on PCIe platform for HL-2A tokamak

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Plasma Science and Technology 2021年第8期23卷 62-69页

作者： Xiaopeng LI Chao CHEN Weiwei FAN Renjie ZHU Sicheng HUANG Xincheng WEN Zongwu HE qingwei yang Zejie YIN State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026People's Republic of China Department of Modern Physics University of Science and Technology of ChinaHefei 230026People's Republic of China Southwestern Institute of Physics Chengdu 610041People's Republic of China

A real-time magnetic island reconstruction(MIR)system based on PCI express platform for HL-2 A tokamak is *** front-end analog circuit and high performance analog-to-digital converters complete high-precision synchronous sampling of 18 channel Mirnov signals,and the application of PCIe platform and direct memory access technology enables high speed data transmission between graphics processing unit and field programmable gate array(FPGA).FPGA,as a mainstream high speed parallelizable computing tool,was used to implement the MIR algorithm,while a parameter table is established in an external double data rate SDRAM to improve the computational *** software of the MIR system is developed with Compute Unified Device Architecture 8.0 in Centos 6 system,which mainly realizes driver development,data transmission,network communication,parameter calculation and system *** system has been tested in HL-2 A plasma discharge experiment,and the reconstructed magnetic island structure can achieve a spatial resolution of 1.02 cm while the time resolution can reach 2 ms.

关键词： magnetic island reconstruction real-time FPGA PCIe GPU

Surface modification by ligand growth strategy for dense copper bismuth film as photocathode to enhance hydrogen production activity

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Frontiers in Energy 2024年第1期18卷 89-100页

作者： Zhouzhou WANG qingwei WU Jieming WANG Ying YU Institute of Nanoscience and Nanotechnology College of Physical Science and TechnologyCentral China Normal UniversityWuhan 430079China

Hydrogen production from photoelectrochemical(PEC)water splitting has been regarded as a promising way to utilize renewable and endless solar ***,semiconductor film grown on photoelectrode suffers from numerous challenges,leading to the poor PEC ***,a straightforward sol-gel method with the ligand-induced growth strategy was employed to obtain dense and homogeneous copper bismuthate photocathodes for PEC hydrogen evolution *** various characterizations,it was found that the nucleation and surface growth of CuBi_(2)O_(4)layer induced by 2-methoxyethanol ligand(2-CuBi_(2)O_(4))demonstrated a decent crystallinity and coverage,as well as a large grain size and a low oxygen vacancy concentration,leading to the good ability of light absorption and carrier ***,under simulated sunlight irradiation(AM1.5G,100 mW/cm^(2)),the 2-CuBi_(2)O_(4)photocathode achieved an enhanced photocurrent density of−1.34 mA·cm^(−2)at 0.4 V versus the reversible hydrogen electrode and a promising applied bias photon-to-current efficiency of 0.586%.This surface modification by ligand growth strategy will shed light on the future design of advanced photoelectrodes for PEC water splitting.

关键词： copper bismuthate photocathode ligand growth strategy dense film PEC

Simulation of Radiation Losses Using Non-coronal Model on HL-2A

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Southwestern Institute of Physics Annual Report

Southwestern Institute of Physics Annual Report 2006年第1期 50-52页

作者： CHEN Wei yang qingwei LI Wei

The behaviour of impurity in tokamak plasma is exceedingly complex if the impurity transport and recycling from the walls are taken into account. Generally, there is not enough time for the impurity ions of plasma to reach their coronal equilibrium. For example, in coronal equilibrium, negligible radiation is expected for beryllium （Be） above 10 eV boron （B） above 20 eV, carbon （C） above 30 eV, and oxygen （O） above 40 eV, whereas significant radiation has been observed experimentally from these species with the core periphery and scrape-off layer （SOL） temperature typically greater than 40 eV.

关键词：辐射损耗 HL-2A 核反应原子核

Independent and continuous third-order dispersion compensation using a pair of prisms

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High Power Laser Science and Engineering 2014年第4期2卷 68-73页

作者： qingwei yang Xinglong Xie Jun Kang Haidong Zhu Ailin Guo Qi Gao National Laboratory on High Power Laser and Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences

The dispersion of a pair of prisms is analyzed by means of a ray-tracing method operating at other than tip-to-tip propagation of the prisms, taking into consideration the limited spectral bandwidth. The variations of the group delay dispersion and the third-order dispersion for a pair of prisms are calculated with respect to the incident position and the separation between the prisms. The pair of prisms can provide a wide range of independent and continuous third-order dispersion compensation. The effect of residual third-order dispersion on the pulse contrast ratio and pulse duration is also calculated. The residual third-order dispersion not only worsens the pulse contrast ratio, but also increases the pulse duration to the hundreds of femtosecond range for a tens of femtosecond pulse, even when the residual thirdorder dispersion is small. These phenomena are helpful in compensating for the residual high-order dispersion and in understanding its effect on pulse contrast ratios and pulse durations in ultrashort laser systems.

关键词： chirped pulse amplification dispersion prisms ultrashort pulses

High-speed VUV spectroscopy for edge impurity line emission measurements in HL-2A tokamak

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Plasma Science and Technology 2018年第10期20卷 75-83页

作者： Dianlin ZHENG Kai ZHANG Zhengying CUI Ping SUN Chunfeng DONG Ping LU Bingzhong FU Zetian LIU Zhongbing SHI qingwei yang Southwestern Institute of Physics Chengdu 610041People＇s Republic of China

A 20 cm focal length normal incidence vacuum ultraviolet （VUV_20 cm） monochromator with a fast time response has been developed for measuring edge impurity line emission in the wavelength range of 300-2000 A on an HL-2A tokamak. An aberration corrected concave holographic grating with 1200 grooves/mm is adopted in the monochromator, which provides a wavelength dispersion of 40 A mm-1. The aperture is f/4.5. A channel electron multiplier is used as a detector. The time resolution of the system is 17 μs. Wavelength calibration of the system has been done by using a hollow cathode light source in the laboratory with helium and argon gases. The obtained signals of helium and argon spectra are very strong since the inner surface of the monochromator vacuum chamber is blackened and the stray light level is then significantly reduced. The optical property of the system has been examined by scanning the width of the entrance and exit slits. The system is then installed at the mid-port of the HL-2A tokamak and typical line emissions from the HL-2A plasma are measured. Time behaviors of edge impurity line emissions are observed with the fast time response system in different plasma confinement regimes, especially in the H-mode discharges. The result shows that the VUV_20 cm system works very well to measure the edge impurity line emissions in the edge localized modes phase of H-mode discharges.

关键词： VUV monochromator CEM detector wavelength calibration impurity line emission H-mode plasmas

Design and experimental demonstration of a high conversion efficiency OPCPA pre-amplifier for petawatt laser facility

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High Power Laser Science and Engineering 2018年第4期6卷 60-68页

作者： Xiao Liang Xinglong Xie Jun Kang qingwei yang Hui Wei Meizhi Sun Jianqiang Zhu National Laboratory on High Power Laser and Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China

We present the design and experiment of a broadband optical parametric chirped-pulse amplifier(OPCPA) which provides high conversion efficiency and good beam quality at 808 nm wavelength. Using a three-dimensional spatial and temporal numerical model, several design considerations necessary to achieve high conversion efficiency, good beam quality and good output stability are discussed. To improve the conversion efficiency and broaden the amplified signal bandwidth simultaneously, the nonlinear crystal length and OPCPA parameters are analyzed and optimized with the concept of dissipating amplified idler between optical parametric amplification(OPA) of two crystals *** the experiment, an amplifier consisting of two OPCPA stages of ‘L’ type configuration was demonstrated by using the optimized parameters. An amplified signal energy of 160 mJ was achieved with a total pump-to-signal efficiency of 35%(43% efficiency for the OPCPA stage 2). The output bandwidth of signal pulse reached 80 nm and the signal pulse was compressed to 24 fs. The energy stability reached 1.67% RMS at 3% pump energy variation. The optimized OPCPA amplifier operates at a repetition rate of 1 Hz and is used as a front-end injection for the main amplifier of SG-II 5PW laser facility.

关键词： BBO nonlinear optics optical parametric chirped-pulse amplifier petawatt laser