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3D Foam-Based MXene Architectures:Structural and Electrolytic Engineering for Advanced Potassium-Ion Storage

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Energy & Environmental Materials 2024年第4期7卷 64-73页

作者： Peng Zhang yanmeng Peng Qizhen Zhu Razium Ali Soomro Ning sun Bin Xu State Key Laboratory of Organic-Inorganic Composites Beijing Key Laboratory of Electrochemical Process and Technology for Materials Beijing University of Chemical Technology Beijing Advanced Innovation Centre for Soft Matter Science and Engineering Beijing University of Chemical Technology

MXenes are emerging rapidly as promising electrode materials for energy storage due to their high electronic conductivity and rich surface chemistry,but their potassium storage performance is unsatisfactory because of... 详细信息

关键词： 3D foam-like scaffold electrolyte chemistry electrostatic neutralization MXene potassium-ion batteries

Numerical Analysis of Upwind Difference Schemes for Two-Dimensional First-Order Hyperbolic Equations with Variable Coefficients

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Engineering（科研） 2021年第6期13卷 306-329页

作者： yanmeng sun Qing Yang School of Mathematics and Statistics Shandong Normal University Jinan China

In this paper, we consider the initial-boundary value problem of two-dimensional first-order linear hyperbolic equation with variable coefficients. By using the upwind difference method to discretize the spatial derivative term and the forward and backward Euler method to discretize the time derivative term, the explicit and implicit upwind difference schemes are obtained respectively. It is proved that the explicit upwind scheme is conditionally stable and the implicit upwind scheme is unconditionally stable. Then the convergence of the schemes is derived. Numerical examples verify the results of theoretical analysis.

关键词： Two-Dimensional First-Order Hyperbolic Equation Variable Coefficients Upwind Difference Schemes Fourier Method Stability and Error Estimation

基于兰姆波谐振器和超表面的谐振式热红外探测器研究

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传感技术学报 2024年第3期37卷 381-388页

作者：林叶繁党岩盟孙海燕赵继聪王鹏南通大学专用集成电路设计重点实验室江苏南通226019 中国科学院上海技术物理研究所红外物理国家重点实验室上海200437

设计了一种基于氮化铝(AlN)兰姆波谐振器和超表面的谐振式热红外探测器,基于超表面的吸收器用于对特定波长红外辐射的吸收,再利用AlN兰姆波谐振器的温度频率效应检测红外辐射。首先,对兰姆波谐振器的电极周期、电极宽度、AlN薄膜厚度和... 详细信息

设计了一种基于氮化铝(AlN)兰姆波谐振器和超表面的谐振式热红外探测器,基于超表面的吸收器用于对特定波长红外辐射的吸收,再利用AlN兰姆波谐振器的温度频率效应检测红外辐射。首先,对兰姆波谐振器的电极周期、电极宽度、AlN薄膜厚度和支撑轴尺寸进行优化设计,设计了电极周期分别为12μm和1.2μm的谐振器结构,其工作频率分别为365 MHz和2544 MHz。其次,设计了方形结构超表面的等离子体吸收器,并研究分析其红外吸收机理及结构尺寸对吸收性能的影响规律。通过集成超表面红外吸收器并调节吸收结构尺寸,实现可调谐、近100%的双带吸收性能,在3μm~5μm和8μm~12μm处的吸收率均超过99.5%,谐振式热红外探测器的响应时间低于0.8 ms、热噪声等效功率低于10^(-11)Hz/μW。

关键词：红外探测技术热探测器兰姆波谐振器等离子体

1960-2011年河西走廊地表干湿状况的时空变化及影响因素

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水土保持通报 2015年第1期35卷 54-60页

作者：刘扬杨永春张轲孙彦猛兰州大学资源环境学院甘肃兰州730000 兰州大学西部环境教育部重点实验室甘肃兰州730000 兰州大学信息科学与工程学院甘肃兰州730000

[目的]为了探讨河西走廊地区地表干湿状况对气候变化的响应。[方法]利用河西走廊地区14个气象站1960—2011年逐日气象数据,基于FAO推荐的Penman—Monteith模型计算河西走廊各气象站的参考蒸散量和湿润指数,采用Sen’s斜率和Mann—Kendal... 详细信息

[目的]为了探讨河西走廊地区地表干湿状况对气候变化的响应。[方法]利用河西走廊地区14个气象站1960—2011年逐日气象数据,基于FAO推荐的Penman—Monteith模型计算河西走廊各气象站的参考蒸散量和湿润指数,采用Sen’s斜率和Mann—Kendall趋势检验方法,分析河西地区地表干湿的时空变化特征,探讨影响湿润指数变化的主导因子。[结果]河西走廊地表多年平均干湿指数为0.00~0.56,且52a来河西走廊湿润指数整体呈增加趋势;湿润指数的变化具有明显地域性差异。各季节湿润指数亦整体呈增加趋势,以冬季增幅最大,秋、春次之,而夏季变化最小。[结论]河西走廊地区气候属于干旱,52a来湿润指数略有增大,其主要原因是降水的增加和风速的减小。

关键词：参考蒸散发湿润指数 Mann—Kendall趋势检验 Sen’s斜率河西走廊

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运输问题中求检验数的闭回路法

嘉兴学院学报 2014年第6期26卷 101-105页

作者：刘静马柏林孙艳梦陈云巧贾可心嘉兴学院数理与信息工程学院浙江嘉兴314001

针对运输问题中用闭回路法求检验数的方法和经济解释给出数学证明,进一步探讨了在运输问题中出现退化的情况下,"0"元素不是任意位置都可添加,并给出了具体例子和具体方法.

关键词：检验数闭回路基变量退化

Responses of Saline Soil Properties and Cotton Growth to Different Organic Amendments

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Pedosphere 2018年第3期28卷 521-529页

作者： WU Yupeng LI Yufei ZHANG Yi BI yanmeng sun Zhenjun College of Resources and Environment Huazhong Agricultural University Wuhan 430070( China) College of Resources and Environmental Sciences China Agricultural University Beijing 100194( China) Institute of Plant Nutrition and Resources Beijing Academy of Agriculture and Forestry Sciences Beijing 100097( China) School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen 518000( China)

Application of organic waste to saline alkaline soils is considered to be a good practice for soil remediation. The effects of applying different organic amendments （e.g., cattle dung, vermicompost, biofertilizer） and earthworm inoculations （Eisenia fetida） on saline soils and cotton growth were investigated during i year of cotton cultivation. Compared to the control （applied with inorganic NPK fertilizer）, applying organic amendments improved soil physicochemical properties. Biofertilizer application improved available nutrient content, reduced short-term soil electrical conductivity, and produced the highest cotton yield, whereas cattle dung and vermicompost applications resulted in higher soil organic matter content. Application of organic amendments significantly increased soil microbial biomass carbon during the flowering period, which sharply declined at harvest. This was especially true for the biofertilizer treatment, which also exhibited lower nematode abundance compared with the other organic materials. Earthworm inoculation following cattle dung application failed to significantly change soil physicochemical properties when compared to the treatments without earthworm inoculation. Results suggest that biofertilizer application to saline soil would improve soil nutrient status in the short-term, whereas cattle dung application would improve soil organic matter content and increase soil organism abundance to a greater extent. However, different strategies might be required for long-term saline soil remediation.

关键词： biofertilizer cattle dung earthworm inoculation saline soil remediation vermicompost

Influence of Texture on Hall-Petch Slope in Hot-extruded AZ31 Magnesium Alloys

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Journal of Wuhan University of Technology(Materials Science) 2023年第4期38卷 917-923页

作者：王岭 ZHAO Yiquan WANG yanmeng sun Chao CHEN Hongmei ZHANG Jing ZHAO Mei LIU Ying WANG Yinong Liaoning Key Laboratory of Chemical Additive Synthesis and Separation Yingkou Institute of TechnologyYingkou115014China CATARC Automotive Test Center(Tianjin)Co. LtdTianjin300399China School of Electrical Engineering Dalian University of TechnologyDalian116024China Provincial Key Lab of Advanced Welding Technology Jiangsu University of Science and TechnologyZhenjiang212003China School of Metallurgy and Materials Engineering Jiangsu University of Science and TechnologyZhangjiagang215600China School of Materials Science and Engineering Dalian University of TechnologyDalian116024China

To study the influence of texture on Hall-Petch slope,the Hall-Petch relationships of two hot-extruded AZ31 alloys(A117 and A189)were determined by the measurement of yield strength at room *** determine the real texture difference,the texture changes were facilitated by the variation of extrusion ratio and demonstrated by the actual grain orientation *** A117 alloys exhibited higher Hall-Petch slope in comparison of A187 in the condition of tension and compression,because A117 alloys had lower volume fraction of grains in the range of basal pole 75°-90°.The Hall-Petch slope differences for both alloys were analyzed and discussed by boundary obstacle against deformation propagation in grains with various *** to the higher volume fraction of grains in the range of basal pole 75°-90°in A189,the effect of hindering dislocation slip or twinning propagation by grains boundary was weaker than of A117.

关键词： Hall-Petch relationship AZ31 texture

Validation results of NmF2 and hmF2 derived from ionospheric density profiles of GNOS on FY-3C satellite

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Science China(Technological Sciences) 2018年第9期61卷 1372-1383页

作者： YANG GuangLin sun YueQiang BAI WeiHua ZHANG XiaoXin LIU CongLiang MENG XiangGuang BI yanmeng WANG DongWei ZHAO DanYang National Space Science Center China Academy of Sciences Beijing 100190 China Key Laboratory of Space Weather National Center for Space Weather China Meteorological Administration Beijing 100081 China National Satellite Meteorological Center Beijing 100081 China Beijing Key Laboratory of Space Environment Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

The first Global Navigation Satellite System Occultation Sounder(GNOS) which is compatible of both Bei Dou System(BDS)and Global Positioning System(GPS) was successfully launched into orbit onboard the Feng Yun 3 C satellite(FY-3 C) on September 23, 2013, and it has already gathered a large amount of ionosphere radio occultation(RO) data so far. However, the detailed analysis and validation of GPS ionosphere RO data have not been done up to now. Therefore, this paper discusses the configuration of the FY-3 C GNOS, the methods and results of GPS ionosphere occultation processment, the quality analysis of the GPS ionosphere RO products, and the precision consistency between the GNOS GPS ionosphere RO product and ionosonde data. The peak electron density(Nm F2) correlation coefficient is 0.97, the corresponding standard deviation is 16.08%. The peak value altitude(hm F2) correlation coefficient is 0.89, and the corresponding standard deviation is 23.79 km. The in-orbit operation of GNOS provides a basis data set for the monitoring, forecasting and research of ionosphere's space weather.

关键词： radio occultation Global Navigation Satellite System BeiDou System ionosphere

2017-2019年山东省临床分离流感嗜血杆菌的耐药性监测

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中国感染与化疗杂志 2023年第1期23卷 73-79页

作者：孙彦蒙王梦园李政王世富周卫萍李仁哲陈艳萍刘志伟孙淑红李艳华李宜雷李艳满思金李静寇琳娜于文文张春艳山东大学附属儿童医院临床微生物科山东省儿童健康与疾病临床医学研究中心济南250022 临沂市妇女儿童医院检验科济宁市第一人民医院检验科青岛妇女儿童医院检验科泰安市妇幼保健院检验科临沂市人民医院检验科聊城市人民医院检验科日照市人民医院检验科枣庄市妇幼保健院检验科滕州市中心人民医院检验科

目的分析山东地区临床分离流感嗜血杆菌的菌株分布特点及耐药性,促进临床对流感嗜血杆菌治疗药物的合理选择。方法依托山东省儿童细菌&真菌耐药监测研究协作网,收集2017年1月1日—2019年12月31日山东省医疗单位临床分离的非重复流感... 详细信息

目的分析山东地区临床分离流感嗜血杆菌的菌株分布特点及耐药性,促进临床对流感嗜血杆菌治疗药物的合理选择。方法依托山东省儿童细菌&真菌耐药监测研究协作网,收集2017年1月1日—2019年12月31日山东省医疗单位临床分离的非重复流感嗜血杆菌,采用纸片扩散法或自动化仪器法按统一方案进行药敏试验,结果判读依照CLSI2022版M100抗微生物药物敏感性试验执行标准。使用WHONET 5.6和SPSS 22.0软件对数据进行分析。结果共收集流感嗜血杆菌18 057株,多分离于痰、咽拭子、肺泡灌洗液等标本,感染呈季节性分布。2017—2019年氨苄西林耐药率为69.5%、76.4%、79.7%,β内酰胺酶阳性率为63.0%、72.1%、76.6%,β内酰胺酶阴性氨苄西林耐药的流感嗜血杆菌(BLNAR)占比分别为9.7%、7.9%、7.3%。对氨苄西林、氨苄西林-舒巴坦、头孢呋辛耐药率均呈逐年上升趋势,对氯霉素、亚胺培南、美罗培南、左氧氟沙星的耐药率均呈现逐年下降的趋势。结论山东省流感嗜血杆菌对氨苄西林的耐药率>60%,BLNAR的均值高达8.1%,据此氨苄西林不宜为治疗流感嗜血杆菌的临床首选药物;对第三代头孢菌素的耐药率低,宜作为流感嗜血杆菌治疗的首选药物。该菌对临床儿童常用抗生素耐药形势严峻,亟需加强其耐药监测,从而指导临床合理使用抗菌药物以减缓流感嗜血杆菌的耐药。

关键词：流感嗜血杆菌 β内酰胺酶耐药性监测