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Ripple-based matrix modeling and cross-coupling effect analysis of double-input DC-DC Boost converters

Science China(Technological Sciences) 2022年第8期65卷 1878-1890页

作者： zhang Hao REN han yi ChuanZhi DONG DaChu State Key Lab of Electrical Insulation&Power Equipment School of Electrical EngineeringXi’an Jiaotong UniversityXi’an 710049China Bosch Automotive Product(Suzhou)Co.Ltd Suzhou 215000China hangzhou Power Supply Company of State Grid Zhejiang Electric Power Co.Ltd Hangzhou 310000China

This paper deals with the modeling and cross-coupling effect analysis in double-input Boost converters with multiplex current control. A ripple-based multiplex current controlled matrix model is proposed to restore the system's high-frequency domain dynamics information and resolve the coexistence problem of the sample-and-hold effect in multiplex current controllers, which significantly improves the resolution of the conventional average model. Based on the proposed model, both sub-harmonic and low-frequency oscillations are identified in terms of stability analysis, and the inherent mechanism of these complicated nonlinear dynamic behavior is revealed, which not only illustrates the origin of the oscillations but also points out the dominant factors in diverse types of instability situation. Besides, cross-coupling effect analysis is performed to study the interaction between the input ports with the help of the Gershgorin band, and the mechanism of the special unbalanced oscillation phenomenon is revealed. Furthermore, the sensitivity analysis approach is used to identify the key parameters with respect to the cross-coupling effect, which provides more design-oriented knowledge for practical engineering. In addition, the benefits of the proposed model are further illustrated through a comparative analysis. Finally, these theoretical results are verified by experimental ones. These results are beneficial to the improvement of performance as well as the understanding of the cross-coupling effect of multi-input converters.

关键词： ripple-based matrix model cross-coupling effect multiplex current control multi-input converter Gershgorin band

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黑磷/黑砷异质结纳米器件热电性质应力调控研究

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原子与分子物理学报 2025年第1期42卷 69-74页

作者：戎杙邱乙峰张蓓新疆大学物理科学与技术学院乌鲁木齐830046

探索新型高性能低维热电纳米材料已成为国家重大发展策略.论文采用密度泛函理论结合非平衡态格林函数方法研究了由黑磷、黑砷纳米带构建异质结构在2%、4%、6%和8%四种拉伸应变作用下热电性能调控机理.研究结果表明,6%拉伸应变较其他情形... 详细信息

探索新型高性能低维热电纳米材料已成为国家重大发展策略.论文采用密度泛函理论结合非平衡态格林函数方法研究了由黑磷、黑砷纳米带构建异质结构在2%、4%、6%和8%四种拉伸应变作用下热电性能调控机理.研究结果表明,6%拉伸应变较其他情形,能够更有效抑制声子输运行为;与此同时,拉伸应变对于器件的电子输运的调控效果并不明显.在费米能附近,黑磷/黑砷异质结纳米器件在6%拉伸应变调控下热电优值达到最大值2.31.

关键词：黑磷黑砷异质结应力热电性质

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一种水油混合式食品油炸机机械结构设计

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装备制造技术 2018年第7期 44-46页

作者：曾毅翀张含叶郑厚斌卢宏刘对九江学院机械与材料工程学院九江332005

针对目前油炸食品存在的安全问题,设计了一种水油混合式食品油炸机。该油炸机机械结构主要由外部框架、油炸锅、油渣分离器和水箱组成。该油炸机不仅可以满足炸油的净化循环使用,而且可以保证油炸食品的安全。

关键词：油炸食品油炸机油渣分离器油炸锅

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黔、川、湘灰毡毛忍冬药材及栽培土壤主要金属元素分析

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遵义医学院学报 2016年第5期39卷 487-490页

作者：张丹丹彭艺张涵王安俊杨建文遵义医学院生药学教研室贵州遵义563099 遵义医学院无机化学教研室贵州遵义563099 遵义医学院附属医院药剂科贵州遵义563099

目的探讨黔、川、湘3个不同产地灰毡毛忍冬药材中主要金属元素与土壤之间的关系,为当地灰毡毛忍冬的生产提供科学依据。方法应用微波消解-火焰原子吸收分光光谱法分别对三地灰毡毛忍冬药材及土壤样品中7个金属元素进行含量测定,采用SPSS... 详细信息

目的探讨黔、川、湘3个不同产地灰毡毛忍冬药材中主要金属元素与土壤之间的关系,为当地灰毡毛忍冬的生产提供科学依据。方法应用微波消解-火焰原子吸收分光光谱法分别对三地灰毡毛忍冬药材及土壤样品中7个金属元素进行含量测定,采用SPSS 17.0软件对所得数据进行统计分析。结果四川省南江县、湖南省隆回县药材中金属元素含量整体比贵州省绥阳县高,土壤中金属元素的含量整体表现为贵州省最高,湖南省最低。土壤和药材中金属元素的含量均表现为:K、Ca、Na、Mg和Mn的含量比Zn和Cu高。Mn和Cu的含量在贵州灰毡毛忍冬药材与其生长的土壤之间表现出极显著正相关(P<0.01),Ca的含量呈显著负相关(P<0.05);Zn的含量在四川灰毡毛忍冬药材与其生长的土壤之间表现出显著正相关(P<0.05),Mn呈显著负相关(P<0.05);Cu的含量在湖南省灰毡毛忍冬药材与其生长的土壤之间呈极显著负相关(P<0.01)。灰毡毛忍冬对K、Ca和Na富集作用较强。结论药材中金属元素含量因植物产地不同而存在差异。微波消解-火焰原子吸收分光光谱法可用于灰毡毛忍冬药材中金属元素的测定。

关键词：灰毡毛忍冬金属元素微波消解火焰原子吸收分光光谱仪

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口腔修复科5种常见粉尘的分析与防治

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上海口腔医学 2017年第5期26卷 484-487页

作者：杨翔文朱操云钱亮李一涵张飞飞魏斌上海交通大学医学院附属第九人民医院.口腔医学院口腔修复科上海200011 上海交通大学医学院附属第九人民医院.口腔医学院口腔第一门诊上海市口腔医学重点实验室上海市口腔医学研究所国家口腔疾病临床研究中心上海200011

目的:分析与评价口腔修复诊室中粉尘污染问题并提出合理的防护建议。方法:使用扫描电镜(scanning electron microscope,SEM)、X射线能谱色散谱仪(energy dispersive spectrometer,EDS)及粉尘浓度激光测试仪作为检测手段,对口腔修复中常... 详细信息

目的:分析与评价口腔修复诊室中粉尘污染问题并提出合理的防护建议。方法:使用扫描电镜(scanning electron microscope,SEM)、X射线能谱色散谱仪(energy dispersive spectrometer,EDS)及粉尘浓度激光测试仪作为检测手段,对口腔修复中常用的5种义齿材料(饰面瓷、钴铬合金、光敏塑料、超硬基托树脂、高级人工牙)所产生的粉尘进行颗粒的粒径大小、元素组成及粉尘浓度分析,评估口腔修复诊室粉尘对医务人员健康的影响,并提出口腔诊室粉尘防治的合理化建议。结果:饰面瓷、钴铬合金、光敏塑料、超硬基托树脂、高级人工牙的粉尘颗粒粒度分别为(2.15±3.00)、(33.78±24.33)、(7.78±11.86)、(31.16±44.35)及(28.45±39.21)μm。其中,饰面瓷呼吸性粉尘的时间加权平均容许浓度为0.393 mg/m2,超出国家安全范围。结论:口腔修复诊室中粉尘污染严重,应予以重视,并采取适当的防护措施。

关键词：粉尘口腔修复粉尘防治

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Effect of process parameters on the microstructure and properties of laser-clad FeNiCoCrTi0.5 high-entropy alloy coating

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International Journal of Minerals,Metallurgy and Materials 2020年第5期27卷 630-639页

作者： ying zhang Teng-fei han Meng Xiao yi-fu Shen College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics(NUAA)Nanjing 210016China Nanjing Institute of Advanced Laser Technology Nanjing 210038China

FeNiCoCrTi0.5 coatings with different process parameters were fabricated by laser cladding. The macro-morphology, phase, microstructure, hardness, and wear resistance of each coating were studied. The smoothness and dilution rate of the FeNiCoCrTi0.5 coating generally increased with the increase of specific energy(Es), which is the laser irradiation energy received by a unit area. FeNiCoCrTi0.5 coatings at different parameters had bcc, fcc, and Ti-rich phases as well as equiaxed, dendritic, and columnar structures. When Es increased, the size of each structure increased and the distribution area of the columnar and dendritic structures changed. The prepared FeNiCoCrTi0.5 coating with the Es of 72.22 J·mm-2 had the highest hardness and the best wear resistance, the highest hardness of the coating reached HV 498.37, which is twice the substrate hardness. The average hardness of the FeNiCoCrTi0.5 coating with the Es of 72.22 J·mm-2 was 15.8% higher than the lowest average hardness of the coating with the Es of 108.33 J·mm-2. The worn surface morphologies indicate that the FeNiCoCrTi0.5 coatings exhibited abrasive wear.

关键词： high-entropy alloy coating 45 steel laser cladding microstructure wear resistance

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A High-performance Lithium Metal Battery with a Multilayer Hybrid Electrolyte

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Energy & Environmental Materials 2023年第1期6卷 309-316页

作者： Qiang yi Wenqiang zhang Tianyuan Wang Junxing han Chunwen Sun School of Chemical and Environmental Engineering China University of Mining&Technology(Beijing)Beijing 100083China CAS Center for Excellence in Nanoscience Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100083China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China

Solid-state batteries have been considered as a good choice for substituting traditional batteries with liquid electrolytes because of their high energy density and safe ***,a little amount of flammable non-aqueous liquid electrolyte or polymer electrolyte is usually required to improve the interfacial contact,which is adverse to ***,a nonflammable gel is prepared by hydrogen-bond interaction and applied as an interfacial layer to improve the performance of solid-state *** prepared multilayer hybrid electrolyte(MHE)composed of gel and CPE shows a wide electrochemical window(5.3 V vs Li/Li+),high ionic transference number(0.57),and ionic conductivity(7.18×10^(−4) S cm^(−1))at room ***,the assembled Li symmetric cell with MHE can cycle over 650 h at 0.5 mA cm^(−2) with a lower overpotential of~61 *** LiFePO_(4)|MHE|Li cell exhibits a higher discharge capacity of 107.8 mAh g−1 even cycled at 5 *** also shows superior capacity retention of 96.4%after 1000 cycles at 0.5 *** work provides a promising strategy for designing high-performance solid-state batteries.

关键词： Battery electrolyte performance

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The fabrication of atomically thin-MoS_(2) based photoanodes for photoelectrochemical energy conversion and environment remediation:A review

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Green Energy & Environment 2022年第3期7卷 372-393页

作者： Zexu Chi Jingyun Zhao yi zhang han Yu Hongbing Yu College of Environment Science and Engineering Nankai UniversityTianjin300350China Department of Water Resources Engineering Lund UniversityLund22100Sweden

Photoelectrochemical(PEC) technology has been proved a promising approach to solve the problems of energy shortages and environmental pollution *** can convert unlimited solar energy resources into energy forms needed by *** development of highly efficient photoanodes is a key step in realizing the large-scale practical application of PEC ***,the development of PEC photoanodes has been severely hindered by the issues of easy recombination of photo-generated charge carriers,low photon-to-electron conversion efficiency,poor photo-corrosion resistance,and low catalytic ***,constructing high-performance and stable photoanodes is an urgent research field to promote the progress of PEC *** atomically thin molybdenum disulfide(AT-MoS_(2)) with unique physical and chemical properties has been widely applied in the fabrication of PEC *** AT-MoS_(2) based photoanodes have exhibited excellent PEC performance,which providing promising candidates for ideal PEC ***,we summarize the fundamental natures of MoS_(2) and present the research efforts in the preparation of AT-MoS_(2) based *** for the fabrication of high-efficient AT-MoS_(2) based photoanodes are emphasized to provide guidelines to advance emerging PEC ***,perspectives for the development of more efficient AT-MoS_(2) based photoanodes are proposed.

关键词： energy atomic molybdenum

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基于石墨烯电极TCNQ分子结热/电输运性质理论研究

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原子与分子物理学报 2025年第3期42卷 135-140页

作者：刘仪伟邱乙峰张蓓新疆大学物理科学与技术学院乌鲁木齐830046

本文采用密度泛函理论和非格林平衡函数,对基于石墨烯电极的7,7,8,8-四氰基苯醌二甲烷(Tetracyanoquinodimethane,TCNQ)分子结热/电输运性质进行系统研究.研究结果表明:随着中心TCNQ分子个数的增加,声子透射系数明显降低,即声子透射行... 详细信息

本文采用密度泛函理论和非格林平衡函数,对基于石墨烯电极的7,7,8,8-四氰基苯醌二甲烷(Tetracyanoquinodimethane,TCNQ)分子结热/电输运性质进行系统研究.研究结果表明:随着中心TCNQ分子个数的增加,声子透射系数明显降低,即声子透射行为受到极大抑制.与此同时,电子透射系数也有一定程度的减小.在热/电参数的协同作用下,伴随分子数量的增加分子结热电转换性能呈上升趋势,1TCNQ热电优值(ZT)为0.016,而2TCNQ则上升了1个数量级,ZT值达到0.11.最后,我们对分子结依赖于分子结构个数的自旋输运性质进行研究,发现TCNQ分子结具有显著的自旋过滤效应,其过滤能力随着TCNQ分子数量的增加而增加.该工作可为实验制备分子热电器件提供理论依据和数据支持.

关键词：锯齿状石墨烯纳米带 TCNQ分子自旋输运性质自旋过滤效应

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Species-specific Response of Photosynthesis to Burning and Nitrogen Fertilization

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Journal of Integrative Plant Biology 2008年第5期50卷 565-574页

作者： Yanfang zhang Shuli Niu Wenhua Xu yi han State Key Laboratory of Vegetation and Environmental Change Institute of Botany Chinese Academy of Sciences Beijing 100093 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

The present study was conducted to examine photosynthetic characteristics of three dominant grass species （Agropyron cristatum, Leymus chinensis, and Cleistogenes squarrosa） and their responses to burning and nitrogen fertilization in a semiarid grassland in northern China. Photosynthetic rate （Pn）, stomatal conductance （gs）, and water use efficiency （WUE） showed strong temporal variability over the growing season. C. squarrosa showed a significantly higher Pn and WUE than A. cristatum and L. chinensis. Burning stimulated Pn of A. cristatum and L. chinensis by 24-59% （P 〈 0.05） in the early growing season, but not during other time periods. Light-saturated photosynthetic rate （Pmax） in A. cristatum and the maximum apparent quantum yield （Фmax） in A. cristatum and L. chinensis were significantly enhanced by burning （16-67%） in both the fertilized and unfertilized plots. The main effect of burning on Pn, Pmax and Фmax was not significant in C. squarrosa. The burning-induced changes in soil moisture could explain 51% （P= 0.01） of the burning-induced changes in Pn of the three species. All three species showed positive responses to N fertilization in terms of Pn, Pmax, and Фmax. The stimulation of Pn under N fertilization was mainly observed in the early growing season when the soil extractable N content was significantly higher in the fertilized plots. The N fertilization-induced changes in soil extractable N content could explain 66% （P = 0.001） of the changes in Pn under N fertilization. The photosynthetic responses of the three species indicate that burning and N fertilization will potentially change the community structure and ecosystem productivity in the semiarid grasslands of northern China.

关键词： Agropyron cristatum burning Cleistogenes squarrosa Leymus chinensis nitrogen fertilization photosynthesis

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