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3D Printing of Periodic Porous Metamaterials for Tunable Electromagnetic Shielding Across Broad Frequencies

Nano-Micro Letters 2024年第12期16卷 533-552页

作者： Qinniu Lv Zilin Peng haoran pei Xinxing Zhang Yinghong Chen Huarong Zhang Xu Zhu Shulong Wu State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan UniversityNo.24 South Section 1Yihuan RoadChengdu 610065People’s Republic of China Baosheng Technology Innovation Corporation Limited No.1Suzhong RoadBaoying CountyYangzhou 225800People’s Republic of China

The new-generation electronic components require a balance between electromagnetic interference shielding efficiency and open structure factors such as ventilation and heat *** addition,realizing the tunable shielding of porous shields over a wide range of wavelengths is even more *** this study,the well-prepared thermoplastic polyurethane/carbon nanotubes composites were used to fabricate the novel periodic porous flexible metamaterials using fused deposition modeling 3D ***,the investigation focuses on optimization of pore geometry,size,dislocation configuration and material thickness,thus establishing a clear correlation between structural parameters and shielding *** experimental and simulation results have validated the superior shielding performance of hexagon derived honeycomb structure over other designs,and proposed the failure shielding size(D_(f)≈λ/8-λ/5)and critical inclined angle(θf≈43°-48°),which could be used as new benchmarks for tunable electromagnetic *** addition,the proper regulation of the material thickness could remarkably enhance the maximum shielding capability(85-95 dB)and absorption coefficient A(over 0.83).The final innovative design of the porous shielding box also exhibits good shielding effectiveness across a broad frequency range(over 2.4 GHz),opening up novel pathways for individualized and diversified shielding solutions.

关键词： Polymeric component 3D printing Tunable electromagnetic shielding Periodic porous metamaterials Honeycomb pore structure

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京唐3号高炉炉顶工艺技术的进步

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炼铁 2022年第3期41卷 9-12页

作者：褚世亮王凯裴浩然纪鹏飞首钢京唐钢铁联合有限责任公司首钢京唐钢铁联合有限责任公司炼铁作业部 063200

京唐3号高炉炉顶工艺技术的进步,主要体现在高炉炉顶装料设备的改进、炉顶装料工艺的改进、炉顶均压煤气回收工艺的改进等方面。3号高炉采用新型分体式并罐无料钟炉顶装料设备,及优化放料顺序、防止料面偏析、控制布料精度等装料改进措... 详细信息

京唐3号高炉炉顶工艺技术的进步,主要体现在高炉炉顶装料设备的改进、炉顶装料工艺的改进、炉顶均压煤气回收工艺的改进等方面。3号高炉采用新型分体式并罐无料钟炉顶装料设备,及优化放料顺序、防止料面偏析、控制布料精度等装料改进措施后,高炉的布料稳定性大大提高,为高炉稳定顺行创造了条件。此外,3号高炉还采用了均压煤气强制回收工艺,煤气回收率达到94.3%,减少了污染和浪费。

关键词：特大型高炉炉顶设备装料工艺均压煤气回收

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融合特征熵的轨迹结构异常检测方法

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陕西师范大学学报（自然科学版） 2019年第5期47卷 16-24页

作者：裴浩然袁冠张艳梅李月娥李思宁中国矿业大学计算机科学与技术学院教育部矿山数字化工程研究中心中国矿业大学档案馆江苏徐州221116

从轨迹结构特征出发,分析轨迹内部及整体特征,提出融合特征熵的轨迹结构异常检测方法(TSAD-FE,trajectory structure anomaly detection method based on feature entropy)。根据开放角将轨迹划分为轨迹片段,运用线性回归模型对轨迹片... 详细信息

从轨迹结构特征出发,分析轨迹内部及整体特征,提出融合特征熵的轨迹结构异常检测方法(TSAD-FE,trajectory structure anomaly detection method based on feature entropy)。根据开放角将轨迹划分为轨迹片段,运用线性回归模型对轨迹片段局部特征进行拟合,完成轨迹片段划分;引入轨迹结构框架描述轨迹内部特征属性,应用轨迹结构距离衡量轨迹片段之间的距离,并提出利用熵对特征权重赋值的方法,全面考虑轨迹内部特征对轨迹的影响;运用DBSCAN(density-based spatial clustering of applications with noise)聚类算法将轨迹集划分为若干簇并提取代表轨迹;通过比较轨迹片段与代表轨迹的结构相似度,提取异常轨迹片段,从轨迹整体上考虑异常轨迹片段占比,进而挖掘出异常轨迹。使用多个数据集的实验表明,融合特征熵的轨迹结构异常检测方法能够从轨迹空间形态及内部特征属性上发现异常,可以全面地发现明显异常轨迹及其分段,使检测结果更具有实际意义。

关键词：熵轨迹结构相似度异常检测轨迹划分人工智能

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A novel obstacle avoidance heuristic algorithm of continuum robot based on FABRIK

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Science China(Technological Sciences) 2022年第12期65卷 2952-2966页

作者： WU haoran YU JingJun PAN Jie pei Xu Robotics Institute Beihang UniversityBeijing 100191China Department of Mechanical Design Beihang UniversityBeijing 100191China

Obstacle avoidance and path planning of continuum robots are challenging tasks due to the hyper-redundant degree of freedoms(DOFs)and restricted working ***,most current heuristic algorithm-based obstacle avoidance algorithms exist with low computational efficiency,complex solution process,and inability to add global *** paper proposes a novel obstacle avoidance heuristic algorithm based on the forward and backward reaching inverse kinematics(FABRIK)*** update of key nodes in this algorithm is modeled as the movement of charges in an electric field,avoiding complex nonlinear *** algorithm achieves the robustness of inverse kinematics and path tracking in complex environments by imposing constraints on key nodes and determining the location of obstacles in *** algorithm is characterized by a high convergence rate,low computational cost,and can be used for real-time *** proposed approach also has wide applicability and can be applied to both mobile and fixed-base continuum *** it can be further extended to the field of hyper-redundant *** algorithm's effectiveness is further validated by simulating the path tracking and obstacle avoidance of a five-segment continuum robot in various environments and comparisons with classical methods.

关键词： continuum robot FABRIK algorithm obstacle avoidance motion planning

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Effect of Rolling Process on Microstructure and Wear Properties of High Carbon Equivalent Gray Cast Iron

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Journal of Wuhan University of Technology(Materials Science) 2021年第6期36卷 903-910页

作者： ZHAO Yihong CHEN Qianyu ZHENG Zhiwei CAO pei GONG Ziyu GENG haoran CHEN Rongfa School of Mechanical Engineering Yangzhou UniversityYangzhou 225127China School of Engineering University of BirminghamUK Tongfu(Kunshan)Heat Treatment Co.Ltd Suzhou 215300China

Rolling process based on the plastic deformation as a surface strengthening treatment was employed,aiming to improve the wear resistance ability and functional performance of the high carbon equivalent gray cast iron(HCEGCI).The microstructures and tribological performance of the untreated and rolled samples were *** addition,the wear mechanism of HCEGCI samples was also studied via pin-on-disc *** experimental results show that the as-rolled samples possess the structure-refined layer of 15μm and work-hardened layer of 0.13 *** comparison with the surface hardness of untreated samples,the surface hardness of as-rolled samples increases by 84.6%(from 240HV0.1 to 443HV0.1)and the residual compressive stresses existed within the range of 0.2 *** wear rates of as-rolled samples were decreased by 38.4%,37.5%,and 44.4%under different loads of 5 N,10 N,and 15 N,*** wear characteristics of the untreated samples mainly exhibit the peeling wear coupled with partial adhesive and abrasive ***,as for the as-rolled samples,the adhesive wear was limited by the structure-refined layer and the micro-crack propagation was controlled by the work-hardened ***,the wear resistance of as-rolled samples can be improved significantly due to the low wearing degree of the friction contact zone.

关键词： high carbon equivalent alloy gray cast iron rolling process microstructure wear resistance

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基于OVMD算法集成学习模型的火电厂关键辅机故障诊断

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自动化仪表 2023年第4期44卷 43-47页

作者：周传杰张林陈节涛张航裴浩然徐春梅彭道刚国电长源汉川第一发电有限公司湖北武汉431614 上海电力大学自动化工程学院上海200090

针对火电厂辅机设备运行工况复杂、系统非线性强、易受背景噪声干扰、故障特征难以提取等问题,提出1种基于最优变分模态分解(OVMD)算法的集成学习模型故障诊断方法。首先,使用OVMD算法对辅机的纵向与横向原始振动信号进行预处理,从中提... 详细信息

针对火电厂辅机设备运行工况复杂、系统非线性强、易受背景噪声干扰、故障特征难以提取等问题,提出1种基于最优变分模态分解(OVMD)算法的集成学习模型故障诊断方法。首先,使用OVMD算法对辅机的纵向与横向原始振动信号进行预处理,从中提取均方根、裕度、峰值、平均值、波形指标、方差等10个参数作为轻量级梯度提升机(LightGBM)的特征向量。然后,结合集成学习算法构造Bagging-LightGBM集成学习模型。试验结果表明:与单一的LightGBM分类器相比,Bagging-LightGBM集成学习模型对于火电厂辅机故障诊断性能更优。集成学习模型为火电厂辅机故障诊断研究提供了参考。

关键词：火电厂关键辅机最优变分模态分解算法集成学习轻量级梯度提升机特征提取故障诊断

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“Three birds with one stone”nanoplatform:Efficient near-infrared-triggered type-I AIE photosensitizer for mitochondria-targeted photodynamic therapy against hypoxic tumors

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Aggregate 2024年第4期5卷 279-293页

作者： Shengnan Liu Yu pei Yan Sun Ziwei Wang haoran Chen Dongxia Zhu Martin R.Bryce Ben Zhong Tang Yulei Chang Key Laboratory of Nanobiosensing and Nanobioanalysis at Universities of Jilin Province Department of ChemistryNortheast Normal UniversityChangchunJilin ProvincePeople’s Republic of China State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchunJilin ProvincePeople’s Republic of China Department of Chemistry Durham UniversityDurhamUK Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionState Key Laboratory of Molecular NeuroscienceDivision of Life ScienceMing Wai Lau Centre for Reparative MedicineKarolinska Instituteand Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional MaterialsThe Hong Kong University of Science and TechnologyKowloonHong KongPeople’s Republic of China School of Science and Engineering Shenzhen Institute of Aggregate Science and TechnologyThe Chinese University of Hong KongShenzhenGuangdongPeople’s Republic of China

Currently three major problems seriously limit the practical application of can-cer photodynamic therapy(PDT):(i)the hypoxic tumor microenvironment(TME);(ii)low generation efﬁciency of toxic reactive oxygen species(ROS)in aggre-gates and(iii)shallow tissue penetration depth of excitation *** limited approaches are available for addressing all the above three problems with a single ***,a rational“three birds with one stone”molecular and nanoengi-neering strategy is demonstrated:a photodynamic nanoplatform U-Ir@PAA-ABS based on the covalent combination of lanthanide-doped upconversion nanoparti-cles(UCNPs)and an AIE-active dinuclear Ir(III)complex provides a low oxygen concentration-dependent type-I photochemical process upon 980 nm irradiation by Föster resonance energy transfer(FRET).U-Ir@PAA-ABS targets mitochondria and has excellent phototoxicity even in severe hypoxia environments upon 980 nm irradiation,inducing a dual-mode cell death mechanism by apoptosis and *** together,the in vitro and in vivo results demonstrate a successful strategy for improving the efﬁcacy of PDT against hypoxic tumors.

关键词： hypoxia tumor iridium complex nanoplatform near-infrared photosensitizer photodynamic therapy type-I photosensitizer

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华龙一号设备冷却水系统板式换热器性能研究

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核动力工程 2018年第A01期39卷 115-118页

作者：于沛付浩然中国核电工程有限公司系统与布置设计所北京100840

采用准则数法换热公式、HTRI传热因子经验公式、Matin传热经验公式、Muley A传热经验公式4种方法对福清核电厂1&2号机组的板式换热器进行校核计算。采用准则数法换热公式计算的换热面积与厂家设计值偏差最小。采用准则数法对华龙一号设... 详细信息

采用准则数法换热公式、HTRI传热因子经验公式、Matin传热经验公式、Muley A传热经验公式4种方法对福清核电厂1&2号机组的板式换热器进行校核计算。采用准则数法换热公式计算的换热面积与厂家设计值偏差最小。采用准则数法对华龙一号设备冷却水系统板式换热器进行验证,结果表明厂家提供的换热器满足工程要求。

关键词：设备冷却水系统板式换热器传热膜系数

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Activated carbons and amine-modified materials for carbon dioxide capture- a review

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Frontiers of Environmental Science & Engineering 2013年第3期7卷 326-340页

作者： Zhenhe CHEN Shubo DENG haoran WEI Bin WANG Jun HUANG Gang YU State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment POPs Research Center Tsinghua University Beijing 100084 China Tsinghua University .- Veolia Environment Joint Research Center for Advanced Technotogy Tsinghua University Beijing 100084 China

Rapidly increasing concentration of CO2 in the atmosphere has drawn more and more attention in recent years, and adsorption has been considered as an effective technology for CO2 capture from the anthropogenic sources. In this paper, the attractive adsorbents including activated carbons and amine-modified materials were mainly reviewed and discussed with particular attention on progress in the adsorbent preparation and C02 adsorption capacity. Carbon materials can be prepared from different precursors including fossil fuels, biomass and resins using the carbonization-activation or only activation process, and activated carbons prepared by KOH activation with high CO2 adsorbed amount were reviewed in the preparation, adsorption capacity as well as the relationship between the pore characteristics and CO2 adsorption. For the amine-modified materials, the physical impregnation and chemical graft of polyethylenimine （pei） on the different porous materials were introduced in terms of preparation method and adsorption perfor- mance as well as their advantages and disadvantages for CO2 adsorption. In the last section, the issues and prospect of solid adsorbents for CO2 adsorption were summarized, and it is expected that this review will be helpful for the fundamental studies and industrial applications of acti- vated carbons and amine-modified adsorbents for CO2 capture.

关键词： adsorption capacity CO2 capture activatedcarbon amine-impregnated adsorbents

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面向卫星高速数字通信的IQ独立处理基带结构

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清华大学学报（自然科学版） 2018年第9期58卷 827-832页

作者：裴玉奎郝浩然苏厉清华大学宇航技术研究中心北京100084 深圳清华大学研究院深圳518057 清华大学电子工程系北京100084

提高卫星数字传输的速率要求增大信道带宽,需要接收端的高采样率的模数转换器支持。在极高采样率下,共模（I）、正交（Q）两路使用独立的模数转换器采样,需要分别进行基带处理。针对该应用场景,设计了一种IQ独立处理的基带结构。该结构... 详细信息

提高卫星数字传输的速率要求增大信道带宽,需要接收端的高采样率的模数转换器支持。在极高采样率下,共模（I）、正交（Q）两路使用独立的模数转换器采样,需要分别进行基带处理。针对该应用场景,设计了一种IQ独立处理的基带结构。该结构通过重新设计辅助序列、调整处理顺序、改变处理算法等手段,使频偏估计与定时同步等处理步骤能在IQ数据上独立进行。仿真结果表明：所设计的结构传输速度快,与传统结构的误比特率性能差距在2dB之内。

关键词：卫星通信基带结构 IQ独立处理频偏估计定时同步

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