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基于小波包分析和K-OPLS的集成方法在颗粒粒径分布检测中的应用

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化工学报 2010年第6期61卷 1349-1356页

作者：陈敏贺益君王靖岱阳永荣化学工程国家重点实验室(浙江大学) 浙江大学化学工程与生物工程学系浙江杭州310027

颗粒粒径分布的实时在线检测对于调控气固流化床中颗粒的流化特性具有重要意义。基于混料均匀设计法安排实验,以声发射(AE)技术为检测手段,结合小波包分析,提出采用K-OPLS方法构建颗粒粒径分布的声信号预测模型,定量描述小波包能量特征... 详细信息

颗粒粒径分布的实时在线检测对于调控气固流化床中颗粒的流化特性具有重要意义。基于混料均匀设计法安排实验,以声发射(AE)技术为检测手段,结合小波包分析,提出采用K-OPLS方法构建颗粒粒径分布的声信号预测模型,定量描述小波包能量特征与颗粒粒径分布的非线性变化规律。实验结果显示,留一交叉验证法的均方根误差(RMSE)仅为0.063,表明基于K-OPLS的颗粒粒径分布声信号预测模型能准确测量气固流化床中颗粒的粒径分布,具有良好的工业应用前景。

关键词：气固流化床颗粒粒径分布声发射技术小波包分析 K-OPLS

Tunable topological polaritons by dispersion tailoring of an active metasurface

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Advanced Photonics 2024年第4期6卷 59-69页

作者： Shaojie Wang Ke Chen Shufang Dong Tian Jiang Junming Zhao yijun Feng Nanjing University School of Electronic Science and EngineeringNanjingChina

Hyperbolic polaritons are known to exist in materials with extreme anisotropy,exhibiting exotic optical properties that enable a plethora of unusual phenomena in the fields of polaritonics and ***,achieving simultaneous low-dimensionality,high-speed controllability,and on-demand reconfigurability of the polaritons remains unexplored despite their excellent potential in light-matter interactions,photonic integrated circuits,and optoelectronic ***,we propose a metasurface approach to integrating artificially engineered electromagnetic anisotropy with fast-controllable electronic elements,offering a new route to realize active topological *** showcase the proposed reconfigurable metasurface can support real-time transitions of designer polaritons from elliptical to flat,and then to hyperbolic and circular isofrequency ***,the in-plane surface wavefront undergoes the transitions from convex to collimating,concave,and eventually back to *** exploiting the topological variations in polariton dispersions,we observe intriguing phenomena of controllable field canalization and tunable planar ***,we report the concept of a planar reconfigurable integrated polariton circuit by spatially tailoring the distributions of polariton isofrequency contours,unveiling rich dispersion engineering possibilities and active control *** may provide an inspiring platform for developing planar active plasmonic devices with potential applications in subdiffraction-resolution imaging,sensing,and information processing.

关键词： topological transitions hyperbolic metasurface anisotropic polaritons active tuning dispersion engineering

杂交蚁群系统的构建并用于反应动力学参数的估计

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化工学报 2005年第3期56卷 487-491页

作者：贺益君陈德钊吴晓华浙江大学化学工程与生物工程学系浙江杭州310027

经典的蚁群算法模仿蚂蚁觅食, 释放信息素, 形成正反馈互激励机制, 提高了全局寻优效率, 但它只适用于离散问题. 将解空间划分为小区域, 用以承载信息素, 设置全局与局部蚂蚁, 引入遗传算法的种群和操作方式, 以Powell寻优算子和最优解... 详细信息

经典的蚁群算法模仿蚂蚁觅食, 释放信息素, 形成正反馈互激励机制, 提高了全局寻优效率, 但它只适用于离散问题. 将解空间划分为小区域, 用以承载信息素, 设置全局与局部蚂蚁, 引入遗传算法的种群和操作方式, 以Powell寻优算子和最优解保留策略改造蚂蚁的智能活动与互激励机制, 构建为杂交蚁群系统 (hybridant colony system, HACS), 可用于求解连续优化问题. 实例测试表明, HACS具有良好的全局寻优能力和稳定性, 将HACS应用于2 氯苯酚在超临界水中氧化反应动力学参数的估算, 获得了满意的结果.

关键词：杂交蚁群系统遗传算法 Powell算子化学动力学参数估计超临界水氧化反应

基于POI数据的上海市餐饮业空间分布特征及影响因素

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热带地理 2020年第6期40卷 1015-1025页

作者：唐锦玥何益珺塔娜华东师范大学城市与区域科学学院上海200241 华东师范大学地理信息科学教育部重点实验室上海200241 华东师范大学地理科学学院上海200241

以上海市为研究对象,基于兴趣点(POI)数据,运用核密度分析刻画餐饮业空间格局,并构建OLS模型、空间滞后模型、空间误差模型探究餐饮业空间分布的影响因素。结果发现,餐饮业空间分布呈块状聚集、多中心发展的格局。其中,西餐业高度集中... 详细信息

以上海市为研究对象,基于兴趣点(POI)数据,运用核密度分析刻画餐饮业空间格局,并构建OLS模型、空间滞后模型、空间误差模型探究餐饮业空间分布的影响因素。结果发现,餐饮业空间分布呈块状聚集、多中心发展的格局。其中,西餐业高度集中于内环线以内,呈东西向延伸;快餐业在中心城区和高校集聚的城郊结合部大规模集聚。空间计量回归结果表明,餐饮业分布受到人口、经济、交通、空间4类要素的影响:区域经济发展水平高、人口规模大、交通优越、相关业态丰富会促进集聚,而周边业态的混合度过高则会抑制集聚,城市空间结构也会影响餐饮业分布,商圈、中心城区的餐饮业密度更高;中餐、西餐、正餐、快餐4类餐饮业分布的影响因素存在差异性,西餐企业倾向于分布在地价较高的地区,中餐企业对交通可达性有更高的需求,正餐企业的分布与当地区域经济发展水平显著相关,快餐企业的分布与各类文娱公共设施的分布有密切联系。

关键词：餐饮业兴趣点空间格局空间误差模型上海市

In situ polymerization of water-induced 1,3-phenylene diisocyanate for enhanced efficiency and stability of inverted perovskite solar cells

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Interdisciplinary Materials 2024年第2期3卷 316-325页

作者： Shiyao Jia Jiabao Yang Tong Wang Xingyu Pu Hui Chen Xilai he Guangpeng Feng Xingyuan Chen yijun Bai Qi Cao Xuanhua Li State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'anChina

In the realm of photovoltaics,organometallic hybridized perovskite solar cells(PSCs)stand out as promising contenders for achieving high-efficiency photoelectric conversion,owing to their remarkable performance ***,defects within the perovskite layer,especially at the perovskite grain boundaries and surface,have a substantial impact on both the overall photoelectric performance and long-term operational stability of *** mitigate this challenge,we propose a method for water-induced condensation polymerization of small molecules involving the incorporation of 1,3-phenylene diisocyanate(1,3-PDI)into the perovskite film using an antisolvent *** to this step,the introduction of water triggers the polymerization of[P(1,3-PDI)],thereby facilitating the in situ passivation of uncoordinated lead defects inherent in the perovskite *** passivation process demonstrates a notable enhancement in both the efficiency and stability of *** approach has led to the attainment of a noteworthy power conversion efficiency(PCE)of 24.66% in inverted ***,based on the P(1,3-PDI)modification,these devices maintain 90.15% of their initial efficiency after 5000 h of storage under ambient conditions of 25℃ and 50±5% relative ***,even after maximum power point tracking for 1000 h,the PSCs modified with P(1,3-PDI)sustain 82.05% of the initial *** molecules can rationally manipulate water and turn harm into benefit,providing new directions and methods for improving the efficiency and stability of PSCs.

关键词： antisolvent engineering defect passivation inverted perovskite solar cells

Selective leaching of calcium from mechanically activated mixed rare earth concentrate

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Journal of Rare Earths 2024年第6期42卷 1149-1156,I0006页

作者： Jiang Liu Bingxue Chen Yuanqi Feng yijun Cao Yukun Huang Yuan Shi Meng Li Zhongyuan Critical Metals Laboratory School of Chemical EngineeringZhengzhou UniversityZhengzhou450001China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou730050China

The loss of rare earths(REs)takes place during the pre-decalcification process of mixed rare earth *** an effort to reduce such RE loss,a novel idea to improve the leaching selectivity of Ca to REs by applying selective mechanical activation was ***,regarding the key minerals affecting the leaching selectivity of Ca to REs,the differences in the mechanical activation behaviors of CaF_(2) and REFCO_(3) were studied,and we find that the lattice strain of CaF_(2) increases from 0.21%to 0.42%,whereas that of REFCO_(3) increases from 0.31%to 0.40%.Notably,CaF_(2) demonstrates a larger lattice strain than REFCO_(3),indicating greater mechanical activation energy storage and higher leaching ***,the HCl leaching process was studied.A significant leaching selectivity of Ca to REs,from 21.6 to 35.1,is achieved through mechanical *** Ca leaching rate reaches 80.7%when the RE loss is 2.3%in the activated *** study provides an novel approach for achieving selective extraction of specific components via mechanical activation pretreatment.

关键词： Mixed rare earth concentrate Pre-decalcification Selective mechanical activation Selective leaching

青年女性肩部弯度特征及对贴体女上装结构影响

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纺织学报 2016年第10期37卷 94-100页

作者：贺义军石小强王宏付江南大学纺织服装学院江苏无锡214122

为获得最佳的着装美观和舒适性,通过三维人体测量方法获得肩部有关数据,并利用SPSS分析软件对所测数据进行整理分析,以肩部横向弯曲度为研究对象,建立肩部参数对象,即肩弓系数,分析得出其值介于0.702与0.912之间;通过对肩弓进行聚类分... 详细信息

为获得最佳的着装美观和舒适性,通过三维人体测量方法获得肩部有关数据,并利用SPSS分析软件对所测数据进行整理分析,以肩部横向弯曲度为研究对象,建立肩部参数对象,即肩弓系数,分析得出其值介于0.702与0.912之间;通过对肩弓进行聚类分析获得3类不同弯曲度肩型,再结合肩斜将肩部造型整合得出9种不同造型;通过对肩弓与肩宽进行相关性分析得出负相关性;通过运用Opti Tex软件中三维试衣功能建立肩弓模型,分析不同肩弓弯度对着装外观的影响,并通过三维立体裁剪技术获得不同样板纸样,对纸样中各工艺点的位移变化进行分析,总结得出不同肩弓弧度对贴体性上衣的领窝弧线长度和位置、衣身袖笼弧线和肩线的长度均会产生影响,其中对后领窝线长度影响最为显著,即随着肩弓弧度增加,后领窝弧线长度以均值0.3 cm逐渐增加。

关键词：人体测量青年女性肩部弯度上装结构

Risk assessment of agricultural green water security in Northeast China under climate change

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Science China Earth Sciences 2024年第7期67卷 2178-2194页

作者： Jingxuan SUN Guangxin ZHANG Yanfeng WU Liwen CheN Peng QI Boting HU yijun XU Northeast Institute of Geography and Agroecology.Chinese Academy of Sciences Changchun 130102China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Black Soils Conservation and Utilization Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102China School of Renewable Natural Resources Louisiana State University Agricultural Center227 Highland RoadBaton RougeLA 70803USA

Northeast China is an important base for grain production,dominated by rain-fed agriculture that relies on green ***,in the context of global climate change,rising regional temperatures,changing precipitation patterns,and increasing drought frequency pose threats and challenges to agricultural green water *** study provides a detailed assessment of the spatiotemporal characteristics and development trends of green water security risks in the Northeast region under the base period(2001-2020)and the future(2031-2090)climate change scenarios(SSP245 and SSP585)using the green water scarcity(GWS)index based on raster-scale crop spatial distribution data,Delta downscaling bias-corrected ERA5 data,and CMIP6 multimodal *** the base period,the green water risk-free zone for dry crops is mainly distributed in the center and east of the Northeast region(72.4% of the total area),the low-risk zone is primarily located in the center(14.0%),and the medium-risk(8.3%)and high-risk(5.3%)zones are mostly in the *** SSP245 and SSP585 future climate change scenarios,the green water security risk shows an overall expansion from the west to the center and east,with the low-risk zone increasing to 21.6% and 23.8%,the medium-risk zone increasing to 16.0% and 17.9%,and the high-risk zone increasing to 6.9% and 6.8%,*** dry crops with GWS greater than 0.1 as in need of irrigation,the irrigated area increases from 27.6%(base period)to 44.5%(SSP245)and 48.6%(SSP585),with corresponding increases in irrigation water requirement(IWR)of 4.64 and 5.92 billion m~3,respectively,which further exacerbates conflicts between supply and demand of agricultural water *** response to agricultural green water security risks,coping strategies such as evapotranspiration(ET)-based water resource management for dry crops and deficit irrigation are *** results of this study can provide scientific basis and decision support for the development

关键词： Climate change Food security Green water security risk Irrigation water requirement Green water scarcity

A novel molybdenite depressant for efficient selective flotation separation of chalcopyrite and molybdenite

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International Journal of Mining Science and Technology 2024年第8期34卷 1179-1196页

作者： Mengyao Qi Weijun Peng Wei Wang yijun Cao Longyu Zhang Yukun Huang School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China Zhongyuan Critical Metals Laboratory Zhengzhou UniversityZhengzhou 450001China The Key Lab of Critical Metals Minerals Supernormal Enrichment and Extraction Ministry of EducationZhengzhou 450001China

A novel small molecule depressant(M-DEP)was used to separate chalcopyrite and molybdenite via *** results showed that M-DEP had an excellent selective depression on molybdenite,while had little effect on the flotation of *** adsorption capacity of M-DEP on the surface of molybdenite was greater than that on chalcopyrite *** adsorption of M-DEP reduced the floatability of molybdenite and had less effect on the floatability of chalcopyrite,which was due to its different adsorption modes on the surface of the two ***,the interaction between chalcopyrite and M-DEP was mainly chemical interaction,and almost all of the adsorbed M-DEP molecules were removed and replaced by sodium butyl xanthate(SBX).By contrast,hydrophobic interaction was the main way in which M-DEP was adsorbed on the molybdenite surface with little chemical interaction,which was less interfered by SBX ***,M-DEP had a super selective depression on *** study provided a novel depressant and approach for the deep separation of chalcopyrite and molybdenite via flotation.

关键词： Novel molecule depressant Molybdenite Chalcopyrite Flotation separation Selective depression