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Optoelectronics Letters 2024年第1期20卷 28-34页

作者： ZHANG Jiuchao REN Guangjun XUE Yuming XIA Dan wang jiangchao HU Zhaoshuo Institute of New Energy Intelligence Equipment School of Integrated Circuit Science and EngineeringTianjin University of TechnologyTianjin 300384China

When the photovoltaic(PV)system is generating PV power,the partial shading(PS)condition will cause multiple peaks in the power-voltage curve,and changes in light intensity and ambient temperature will cause the curve to *** maximum power point tracking(MPPT)methods,such as the incremental conductance(INC)method,have the problem of being trapped in the local optimal *** optimization algorithms,such as particle swarm optimization(PSO),have problems with oscillation and low tracking efficiency near the global maximum power point(GMPP).As a result,a hybrid algorithm CS-INC based on the cuckoo search(CS)algorithm and the perturb and observe(P&O)approach is proposed in this *** light intensity remains constant,the light intensity changes in steps,and the partial shade scenario are *** results show that the MPPT improves accuracy,speed,and stability.

关键词： power maximum optimization

Effect of preheating and annealing temperature on the microstructure and optoelectronic properties of CZTS films prepared by sol-gel method

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光电子快报:英文版 2023年第7期19卷 410-415页

作者： HU Zhaoshuo XUE Yuming DAI Hongli wang Luoxin ZHANG Jiuchao wang jiangchao Institute of New Energy Intelligence Equipment School of Integrated Circuit Science and EngineeringTianjin Universityof TechnologyTianjin 300384China

The effects of different preheating and annealing temperatures on the surface morphology,microstructure,and optical properties of Cu_(2)ZnSnS_(4)(CZTS) thin films are investigated by controlling the preheating and annealing *** prepared thin films were characterized using X-ray diffraction(XRD),Raman spectroscopy,scanning electron microscopy(SEM),and ultra-violet-visible(UV-Vis) spectroscopy *** and Raman spectroscopy showed that a Kesterite structure with a selective orientation along the(112) peak was generated,and the thin films produced at a preheating temperature of 300℃ and annealing temperature of 570℃ had fewer secondary phases,which was beneficial for improving the performance of the solar *** confirms that the crystallite size increases and then decreases as the temperature increases,and the largest and most uniform crystallite size with the smoothest surface is generated at the above preheating and annealing ***-Vis measurements show that the thin films generated at the above temperature have the lowest transmittance and the lowest optical band gap value of 1.46 e V,which is close to the optimal band gap value for solar cells and is suitable as an absorber layer material.

关键词： annealing microstructure films

低频部署下MIMO-OFDM通信系统的频谱利用效率分析

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通信电源技术 2024年第4期41卷 34-36页

作者：樊恒波李秀成王江超中通服咨询设计研究院有限公司北京100062

主要深入研究低频部署下多进多出-正交频分复用(Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing,MIMO-OFDM)通信系统的频谱利用效率,探讨低频部署对系统性能的影响,并提出相应的优化策略。详细分析低频部... 详细信息

主要深入研究低频部署下多进多出-正交频分复用(Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing,MIMO-OFDM)通信系统的频谱利用效率,探讨低频部署对系统性能的影响,并提出相应的优化策略。详细分析低频部署对信号传输性能和频谱利用效率的影响,评估频谱利用效率,提出针对低频部署的MIMO-OFDM系统的优化策略,最后探讨低频部署下MIMO-OFDM系统的适用场景,为实际应用提供一些建议。

关键词：多进多出-正交频分复用(MIMO-OFDM) 低频部署频谱利用效率

Structural,electrochemical and cycling properties of Nb^(5+)doped LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)cathode materials at different calcination temperatures for lithium-ion batteries

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Optoelectronics Letters 2023年第9期19卷 548-555页

作者： wang jiangchao XUE Yuming DAI Hongli wang Luoxin ZHANG Jiuchao HU Zhaoshuo Institute of New Energy Intelligence Equipment School of Integrated Circuit Science and EngineeringTianjin University of TechnologyTianjin 300384China

LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)cathode material is prepared by sol-gel method and the effects of Nb^(5+)doping and different calcination temperatures on cathode materials were deeply *** and morphological characterizations revealed that the optimal content of 1 mol%Nb^(5+)can stabilize layered structures,mitigate Ni^(2+)migration to Li layers,improve lithium diffusion capacity,and reduce lattice expansion/shrinkage while *** calcination temperature at 800℃can not only ensure good morphology,but also suppress the mixed discharge of lithium and nickel in the internal *** performance evaluation revealed that Nb^(5+)doping improves the discharge-specific capacity of the material,which is conducive to ameliorating its rate capability and cycle *** the material at 800℃exhibits the highest discharge specific capacity,the best magnification performance,low polarizability,and the best cycle reversibility.

关键词： O_(2)cathode materials at different calcination temperatures for lithium-ion batteries Structural doped LiNi electrochemical and cycling properties of Nb

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曲面分段的焊接试验及弯曲变形评估

船舶工程 2024年第9期46卷 107-117页

作者：贾廷芳杨世博王江超刘敬喜赵宏权陈震华中科技大学船舶与海洋工程学院武汉430074 船舶与海洋水动力湖北省重点实验室武汉430074 江苏海事职业技术学院船舶与海洋工程学院南京211199 上海交通大学船舶海洋与建筑工程学院上海200240

曲面分段的建造精度直接影响船体结构的水动力性能及运营成本,其焊接变形的预测和控制,是船舶智能建造的研究难点。以6 mm厚Q235船板钢的单曲率加筋焊接结构为研究对象,在专用胎架上通过二氧化碳(CO_(2))气体保护焊,完成曲面分段建造;... 详细信息

曲面分段的建造精度直接影响船体结构的水动力性能及运营成本,其焊接变形的预测和控制,是船舶智能建造的研究难点。以6 mm厚Q235船板钢的单曲率加筋焊接结构为研究对象,在专用胎架上通过二氧化碳(CO_(2))气体保护焊,完成曲面分段建造;采用全站仪测量曲面分段上胎、封胎、焊接以及脱胎等状态下的结构形状,通过线切割和抛光腐蚀,获得平角焊接头的宏观金相。基于瞬态的热-弹-塑性有限元方法,分析典型平角焊的热-力学行为以及夹具拘束的影响;通过对比熔池形状,确认计算的可靠性,进而评估出焊接固有变形;建立曲面分段的壳单元网格模型,以焊接固有变形为力学载荷,预测曲面分段的建造精度。研究表明:有限元预测的结果与试验测量数据高度吻合,且焊接纵向收缩是曲面分段产生弯曲变形的主要原因。基于上述先进的焊接变形计算方法,分析拘束距离、满焊等工艺对典型接头焊接变形和曲面分段建造精度的影响,可为后续曲面分段的建造工艺优化提供参考。

关键词：薄壁曲面分段焊接变形固有变形弹性有限元分析

Q690厚板对接焊残余应力评估及其对焊接接头断裂性能的影响

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中国舰船研究 2024年第4期19卷 271-281页

作者：王江超杜仕忠牛业兴张庆亚赵宏权吴磊陈震华中科技大学船舶与海洋工程学院湖北武汉430074 高新船舶与深海开发装备协同创新中心上海200240 上海振华重工启东海洋工程股份有限公司江苏南通226200 江苏海事职业技术学院船舶与海洋工程学院江苏南京211199 华中科技大学机械科学与工程学院湖北武汉430074 上海交通大学船舶海洋与建筑工程学院上海200240

[目的]旨在研究高强钢厚板多层多道焊的复杂焊接残余应力,评估其对焊接接头断裂性能的影响。[方法]以75 mm厚Q690高强钢板为研究对象,制定多层多道对接焊工艺,完成对接接头的焊接,使用轮廓法获得中剖面的纵向残余应力,基于自主开发的高... 详细信息

[目的]旨在研究高强钢厚板多层多道焊的复杂焊接残余应力,评估其对焊接接头断裂性能的影响。[方法]以75 mm厚Q690高强钢板为研究对象,制定多层多道对接焊工艺,完成对接接头的焊接,使用轮廓法获得中剖面的纵向残余应力,基于自主开发的高效热−弹−塑性有限元计算方法,再现厚板多层多道焊的热循环、微观组织演变等现象,将单轴拉伸试验与GTN损伤模型相结合,提出Q690高强钢板的GTN模型参数,分析金属母材及焊接接头试样的断裂特性和应力−应变曲线。[结果]采用所提方法预测的厚板对接接头熔池形状、金相体积分数都与试验测量基本吻合;考虑焊接固态相变和高强钢轧制初始应力的力学分析,得到的焊接残余应力与试验结果高度一致,并得到了横向残余应力分布;考虑焊接微观缺陷及横向残余应力,阐明了残余应力影响焊接接头断裂性能的力学机理。[结论]相关研究可为高强钢厚板焊接结构残余应力及断裂性能评估提供借鉴和指导。

关键词：厚板残余应力接头断裂轮廓法 GTN模型

基于遗传基因预测免疫细胞与骨髓炎的因果关系

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中国现代医生 2024年第24期62卷 77-81页

作者：易颖朱赟朱寒霜钱爱王姜超彭家龙三峡大学附属第二人民医院宜昌市第二人民医院五官科湖北宜昌443000 湖南中医药大学研究生院湖南长沙410208 三峡大学附属第二人民医院宜昌市第二人民医院康复医学科湖北宜昌443000

目的利用孟德尔随机化方法预测免疫细胞与骨髓炎(osteomyelitis,OM)的因果关系。方法从英国生物样本库、大规模全基因组关联分析获取731个免疫细胞与OM的数据集。采用逆方差加权法、加权中位数法和MR-Egger法分别依次验证731个免疫细胞... 详细信息

目的利用孟德尔随机化方法预测免疫细胞与骨髓炎(osteomyelitis,OM)的因果关系。方法从英国生物样本库、大规模全基因组关联分析获取731个免疫细胞与OM的数据集。采用逆方差加权法、加权中位数法和MR-Egger法分别依次验证731个免疫细胞与OM的因果关系,并运用Cochra’s Q检验、MR-Egger截距测试、孟德尔随机多态性残差和离群值、留一法评价结果的稳定性和可靠性。结果共21个免疫细胞与OM存在因果关系(P<0.05),其中T调节细胞、经典树突状细胞、B细胞与OM因果关系更稳定(P<0.01),且T调节细胞(OR=0.925,β=–0.078)是降低OM风险的保护因素。经典树突状细胞(OR=1.084,β=0.081)及B细胞(OR=1.063,β=0.061)是OM风险增加的危险因素。结论21个免疫细胞在遗传上与OM风险具有相关性。

关键词：免疫细胞骨髓炎孟德尔随机化 T调节细胞经典树突状细胞 B细胞

Comparative study on evaluation of tendon force for welding distortion prediction in thin plate fabrication

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China Welding 2017年第3期26卷 1-11页

作者： wang jiangchao Zhou Hong Zhao Hongquan Zhou Fangming Ma Ninshu School of Naval Architecture and Ocean Engineering Huazhong University of Science and Technology School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology School of Material Science and Engineering Jiangsu University of Science and Technology Joining and Welding Research Institute Osaka University

Tendon force is an essential concept to predict welding distortion such as longitudinal shrinkage and welding induced buckling in thin plate fabrication. In this study,three approaches with experimental,theoretical and computational analysis,are examined to evaluate the magnitude of tendon force. In detail,inherent deformation theory is introduced first,the theoretical analysis to obtain the inherent strain solution is also reviewed; and then analytical solution for tendon force is achieved. Also,the theory of FE analysis for welding is introduced and implemented in a computation to obtain the transient temperature distribution,plastic strain,residual stress and welding distortion in a bead-on-plate welded joint with 2. 28 mm in thickness. The longitudinal displacement is employed to evaluate tendon force directly,and these computed inherent strain and inherent stress can also be employed to evaluate tendon force by integration approach later. All the evaluated magnitudes of tendon force have a good agreement with each other.

关键词： tendon force welding distortion prediction FE analysis inherent deformation

Tuning zinc doping content to optimize optical and structural properties of Cd1-xZnxS buffer layers

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Optoelectronics Letters 2023年第1期19卷 25-30页

作者： XIE Xin XUE Yuming Lü Chaoqun wang Yifan WEN Binbin wang jiangchao Institute of New Energy Intelligence Equipment School of Integrated Circuit Science and EngineeringTianjin University of TechnologyTianjin300384China

In this paper,Cd1-xZnxS thin films were prepared by chemical bath deposition(CBD),and the effects of different zinc doping content on the morphological structure and optical properties of Cd1-xZnxS buffer layers are systematically *** experimental results show that in the deposition process of different substrates,the crystal structure of the film is all hexagonal,and when the concentration of zinc sulfate(ZnSO4)precursor is varied from 0 to 0.025 M,the films are uniform and *** the increase of zinc content,the X-ray diffraction(XRD)peak of the films shifted behind that of CdS film(002).It showed 70%to 90%transmittance in the visible region and the optical band gap increased *** band gap value of the films obtained ranged from 2.43 eV to 3.01 *** shows the potential feasibility of its application to photovoltaic devices.

关键词： film films properties

板架结构焊接失稳变形的预测及瞬态热拉伸消除

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机械工程学报 2023年第14期59卷 64-72页

作者：易斌王江超华中科技大学船舶与海洋工程学院武汉430074

板架结构作为船舶或者海洋结构的典型部件,其焊接过程导致的失稳变形是困扰建造精度和生产效率的关键问题。以常见的由纵向角钢和横向T型材构成的板架结构为研究对象。首先总结出焊接过程中的典型接头,建立实体单元模型进行热-弹-塑性... 详细信息

板架结构作为船舶或者海洋结构的典型部件,其焊接过程导致的失稳变形是困扰建造精度和生产效率的关键问题。以常见的由纵向角钢和横向T型材构成的板架结构为研究对象。首先总结出焊接过程中的典型接头,建立实体单元模型进行热-弹-塑性有限元分析获得焊接固有变形。随后将焊接固有变形作为力学载荷,加载到板架结构壳单元模型中进行特征值分析和弹性有限元分析,研究该工艺下板架结构的焊接失稳变形特征。同时通过瞬态热拉伸工艺控制板架结构的焊接失稳变形,并研究附加热源施加位置的影响。结果表明,瞬态热拉伸能够影响典型接头的固有变形,特别是减小焊接产生的纵向收缩力。合适的位置施加附加热源可以避免板架结构产生焊接失稳变形;当附加热源施加到距离立板100 mm处的底板上,板架结构没有出现波浪变形,且面外变形峰值减小了49.3%。

关键词：板架结构焊接失稳变形固有变形瞬态热拉伸弹性分析特征值分析