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Application of digital holography to circle flow bed boiler measurement

PU Shiliang, WANG Qinghui, CEN Kefa, Denis Lebrun, REN Kuanfang

《能源前沿（英文）》 2007年 第1卷 第2期   页码 218-222 doi: 10.1007/s11708-007-0029-3

摘要： The spatial distribution of particles in the boiler is very important in the study on the circle flow bed boiler (CFB). Digital in-line holography technique was applied to obtain the spatial and diameter distribution of the particles inside the boiler. A HE-NE laser was used to illuminate the particles inside the CFB through two glass windows and the in-line diffraction pattern was recorded by a CCD camera. The diffraction can be interpreted as a convolution between a family of wavelet functions and the object function. So the three-dimensional (3D) images of the particles in the two-phase flow were reconstructed by the convolution between diffraction pattern and wavelet functions. The particle diameters and 3D coordinates were calculated from the reconstructed 3D images by a series of image-processing methods, followed by a discussion of the experimental results.

关键词： HE-NE     function     convolution     two-phase     diffraction    

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Fractional order extremum seeking approach for maximum power point tracking of photovoltaic panels

Ammar NEÇAIBIA,Samir LADACI,Abdelfatah CHAREF,Jean Jacques LOISEAU

《能源前沿（英文）》 2015年 第9卷 第1期   页码 43-53 doi: 10.1007/s11708-014-0343-5

摘要： Due to the high interest in renewable energy and diversity of research regarding photovoltaic (PV) array, a great research effort is focusing nowadays on solar power generation and its performance improvement under various weather conditions. In this paper, an integrated framework was proposed, which achieved both maximum power point tracking (MPPT) and minimum ripple signals. The proposed control scheme was based on extremum-seeking (ES) combined with fractional order systems (FOS). This auto-tuning strategy was developed to maximize the PV panel output power through the regulation of the voltage input to the DC/DC converter in order to lead the PV system steady-state to a stable oscillation behavior around the maximum power point (MPP). It is shown that fractional order operators can improve the plant dynamics with respect to time response and disturbance rejection. The effectiveness of the proposed controller scheme is illustrated with simulations using measured solar radiation data.

关键词： extremum seeking (ES)     fractional order control (FOC)     fractional calculus     photovoltaic (PV) panel     maximum power point tracking (MPPT)    

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A comprehensive simulator for assessing the reliability of a photovoltaic panel peak power tracking system

Nabil KAHOUL,Mourad HOUABES,Ammar NEÇAIBIA

《能源前沿（英文）》 2015年 第9卷 第2期   页码 170-179 doi: 10.1007/s11708-015-0353-y

摘要： When designing a maximum power point tracking (MPPT) algorithm, it is often difficult to correctly predict, before field testing, the behavior of this MPPT under varying solar irradiation on photovoltaic (PV) panels. A solution to this problem is to design a maximum power point trackers simulator of a PV system used to test MPPT algorithms. This simulator must have the same role as the MPPT card of the PV panel and thus will fully emulate the response of a real MPPT card of the PV panel. Therefore, it is a good substitute to help to test the peak power trackers of the PV system in the laboratory. This paper describes a simple peak power trackers simulator of the PV system which has a short response time thus, can be used to test MPPT algorithms under very rapid variation condition. The obtained results and the theoretical operation confirm the reliability and the superior performance of the proposed model.

关键词： photovoltaic module     DC-DC converter     design     maximum power point tracking (MPPT) card     microprocessor    

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负载均衡的分布式指纹识别系统 Article

Yun-xiang ZHAO,Wan-xin ZHANG,Dong-sheng LI,Zhen HUANG,Min-ne LI,Xi-cheng LU

《信息与电子工程前沿（英文）》 2016年 第17卷 第8期   页码 766-780 doi: 10.1631/FITEE.1500487

摘要： 指纹的唯一性和不变性使得它在各类生物识别系统中得到了广泛的应用。随着指纹识别技术的发展，大规模的指纹存储和系统高并发的需求给指纹识别系统带来了新的挑战。面对这种挑战，我们设计并实现了一个负载均衡的分布式指纹识别系统，它包括分布式指纹特征提取子系统和分布式指纹特征存储子系统两部分。在指纹特征提取的过程中，特征提取与Hadoop图片处理接口（HIPI）的结合使得特征提取的效率得到大幅度提升；特征存储子系统对MongoDB默认的负载均衡策略进行了优化，使得鲁棒性得到了明显提高。相关的试验和模拟表明，相比于Hadoop默认的小文件处理机制，我们的系统可以在指纹特征提取的过程中减少约70%的处理时间；优化后的MongoDB负载均衡策略可以将分布式MongoDB系统的前端mongos负载差距控制在5%以下，基于操作负载（增、删、改、查）的后端数据存储负载均衡策略将由数据迁移带来的时间开销降低了约40%。

关键词： 分布式指纹识别系统；分布式MongoDB；负载均衡    

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构建二维层状结构的稠环含能材料——高能量与高稳定性的平衡 Article

冯永安, 邓沐聪, 宋思维, 陈思同, 张庆华, Jean’ne M. Shreeve

《工程（英文）》 2020年 第6卷 第9期   页码 1006-1012 doi: 10.1016/j.eng.2020.01.013

摘要：

制造具有良好机械感度的高性能含能材料在过去几十年里一直是一项重大挑战，因为这类蕴含巨大能量的材料存在内在的不稳定性。本文研究了一种极具潜力的稠环含能材料：4-硝基-7-叠氮基-吡唑-[3,4-d]-1,2,3-三嗪-2-氧（NAPTO）。这种物质具有不同寻常的二维（2D）层状结构，其绝对结构已经单晶X射线衍射证实。研究显示，这一结构新颖的含能物质具有惊人的能量[如爆速（D）高达9.12 km·s–1，爆压（P）为35.1 GPa]、优异的机械感度[撞击感度（IS）为18 J、摩擦感度（FS）为325 N、静电感度（EDS）为0.32 J]和良好的热分解温度（203.2 ℃），展示出高能量与低感度的双重优势。据我们所知，NAPTO是首个具有二维层状结构的稠环含能材料。与此同时，运用分子模拟分析了其在外界机械刺激下的稳定机制，结果表明，该含能材料超平的二维层状结构比其他结构更能有效地缓冲外界机械刺激，从而将作用在材料上的机械能转化为晶体的层间滑动与压缩。本研究从实验和理论两个方面揭示了稠环二维层状结构在制造先进含能材料方面的巨大潜力。

关键词： 含能材料     稠环杂环化合物     二维层状结构     高能量     稳定性     感度    

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Protective effects of lignin fractions obtained from grape seeds against bisphenol AF neurotoxicity via antioxidative effects mediated by the Nrf2 pathway

《化学科学与工程前沿（英文）》 2023年 第17卷 第7期   页码 976-989 doi: 10.1007/s11705-022-2237-0

摘要： Lignin exhibits antioxidative and various other biological properties. However, its neuroprotection capability has rarely been studied. In this study, three types of lignin with different structures were prepared from grape seeds by using different isolation techniques. The antioxidative and neuroprotective effects of the lignin fractions were evaluated with the apoptosis model of murine neuroectodermal (NE-4C) neural stem cells stimulated with bisphenol AF. The results demonstrated that the half maximal inhibitory concentration for scavenging 2,2-diphenyl-1-picrylhydrazyl with water-soluble lignin (L-W, 58.19 μg·mL–1) was lower than those of lignin in the autohydrolyzed residue of grape seeds (84.27 μg·mL–1) and original lignin in grape seeds (99.44 μg·mL–1). BPAF exposure had negative effects on the reactive oxygen species, malondialdehyde content, and superoxide dismutase and glutathione peroxidase activities in NE-4C cells, which can be reversed by using the prepared lignin to reduce oxidative stress. An immunofluorescence assay demonstrated that grape seed lignin induced protective effects on BPAF-injured NE-4C cells via the nuclear factor erythroid 2-related Factor 2 pathway. In addition, correlational analyses showed that lignin (L-W) with lower molecular weights and noncondensed phenolic hydroxyl group content and higher contents of COOH groups effectively prevented cell apoptosis, scavenged reactive oxygen species, and ensured protection from nerve injury. This study demonstrated that grape seed lignin can be used as a neuroprotective agent and serves as a demonstration of active lignin production from grape seed waste.

关键词： grape seed lignin     structure     antioxidant     NE-4C cells     neuroprotection    

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ne-Alpes (No.

Maiquel DE BRITO,Lauren THÉVIN,Catherine GARBAY,Olivier BOISSIER,Jomi Fred HÜBNER

《信息与电子工程前沿（英文）》 2016年 第17卷 第4期   页码 309-324 doi: 10.1631/FITEE.1500369

摘要： This paper highlights the use of situated artificial institution (SAI) within a hybrid, interactive,normative multi-agent system to regulate human collaboration in crisis management. Norms regulate the actions of human actors based on the dynamics of the environment in which they are situated. This dynamics results from both environment evolution and actors’ actions. Our objective is to situate norms in the environment in order to provide a context-aware crisis regulation. However, this coupling must be a loose one to keep both levels independent and easyto-change in order to face the complex and changing crisis situations. To that aim, we introduce a constitutive level between environmental and normative states providing a loose coupling of normative regulation with environment evolution. Norms are thus no more referring to environmental facts but to status functions, i.e., the institutional interpretation of environmental facts through constitutive rules. We present how this declarative and distinct SAI modelling succeeds in managing the crisis with a context-aware crisis regulation.

关键词： Situated artificial institutions (SAIs)     Normative system     Tangible interaction     Crisis management    

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Structural design and mechanical responses of closely spaced super-span double tunnels in strongly weathered tuff strata

Jiaxin HE; Shaohui HE; Xiabing LIU; Jinlei ZHENG

《结构与土木工程前沿（英文）》 2022年 第16卷 第6期   页码 685-703 doi: 10.1007/s11709-022-0824-2

摘要： This paper presents a study of closely spaced double tunnels in Taizhou, China. One is Xiabei Mountain No. 2 four-line super-span high-speed railway tunnel (HRT), and the other is Xiabei Mountain double-line large-span subway tunnel (ST). The excavation spans of HRT and ST are 26.3 and 14 m, respectively. The two tunnels are located at different levels, and their separating distance is 17.2 m. Due to the short construction period, the HRT excavation was completed earlier than ST. The structural design of the HRT, taking account of the disturbance by the ST construction, was analyzed by a numerical simulation. It was found that the “yielding principle” design was more feasible than the “resistance principle” design when considering the safety and durability of the HRT secondary lining. The mechanical responses of the HRT during ST construction were comprehensively monitored and analyzed, including the vault settlement, horizontal convergence, surrounding rock pressure, and the internal stress in shotcrete and steel arch. Results show that the longitudinal influence range of the ST construction on the HRT was approximately 0.6–1.1 times the ST outer diameter; the disturbance was mainly generated in the ST upper bench excavation; and the final axial force of the HRT shotcrete was approximately 9–16 times that of the steel arch, which indicated that the shotcrete was the main bearing structure. The safety status of the HRT was assessed based on the monitoring data, and the minimum safety factors of the HRT shotcrete and steel arch were 1.61 and 1.89, respectively. Parametric studies were performed to show how the lining stress of HRT was affected by the relative angle, pillar width, ST excavation method and excavation footage. Finally, the design and construction optimization were proposed according to the monitoring data and parameter analysis results. This study might provide practical reference for similar projects.

关键词： double tunnels     super-span     structural design     mechanical response     numerical simulation     field monitoring    

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Comments on this special issue on “Wheat Genetics and Breeding”

Zhonghu HE, Xu LLU

《农业科学与工程前沿（英文）》 2019年 第6卷 第3期   页码 309-309 doi: 10.15302/J-FASE-2019264

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Neighborhood form and CO

Jiaxing GUO, Huan LIU, Yang JIANG, Dongquan HE, Qidong WANG, Fei MENG, Kebin HE

《环境科学与工程前沿（英文）》 2014年 第8卷 第1期   页码 79-88 doi: 10.1007/s11783-013-0516-1

摘要： To understand the household CO emission level in China, as well as how much the neighborhoods’ socio-economic or design factors could influence the CO emission, 23 neighborhoods in Jinan were investigated in 2009 and 2010. These neighborhoods fall into four different types: superblock, enclave, grid and traditional. The household CO emission includes sources of both in-home energy use and passenger transportation. The average CO emission per household is 7.66 t·a , including 6.87 t in-home operational emission and 792 kg transportation emission. The household CO emission by neighborhood categories is 10.97, 5.65, 6.49, 5.40 t·household ·a for superblock, enclave, grid and traditional respectively. Superblock has the highest average emission and also the highest percent (more than 25%) of transportation emission among four different types of neighborhoods. The residential CO emission of superblock neighborhoods in Jinan has already reached the level in developed countries nearly ten years ago. It is predictable that more superblock neighborhoods would be built in China with the fast urbanization. How to avoid the rapid household CO emission growth in the future would be a systematic issue. The study also found that in addition to income and apartment area, household density, land use mix and accessibility to public transportation are three primary factors which have significant impacts on CO emission. High density, mixed land use and convenient accessibility to public transportation tend to reduce household CO emission.

关键词： CO2 emission     neighborhood type     transportation     household energy     China    

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论视觉知识 Perspective

Yun-he PAN

《信息与电子工程前沿（英文）》 2019年 第20卷 第8期   页码 1021-1025 doi: 10.1631/FITEE.1910001

摘要： 提出“视觉知识”概念。视觉知识是知识表达的一种新形式. 它与迄今为止人工智能（AI）所用知识表达方法不同. 其中视觉概念具有典型（prototype）与范畴结构、层次结构与动作结构等要素. 视觉概念能构成视觉命题，包括场景结构与动态结构，视觉命题能构成视觉叙事。指出重构计算机图形学成果可实现视觉知识表达及其推理与操作，重构计算机视觉成果可实现视觉知识学习。实现视觉知识表达、推理、学习和应用技术将是AI 2.0取得突破的重要方向之一。

关键词： None    

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Highlights of special issue on “Wheat Genetics and Breeding”

Zhonghu HE, Zhendong ZHAO, Shunhe CHENG

《农业科学与工程前沿（英文）》 2019年 第6卷 第3期   页码 207-209 doi: 10.15302/J-FASE-2019263

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Shape reconstruction of parallelogram flaw

ZHENG Gangfeng, WU Bin, HE Cunfu

《机械工程前沿（英文）》 2008年 第3卷 第1期   页码 17-22 doi: 10.1007/s11465-008-0015-4

摘要： To reconstruct the shape of the scatterer in elastic media, the authors deduce the Born approximation solution of the two-dimensional scattering problem, which includes the shape factor that embodies all information about the shape of the scatterer. Accordingly, the change in the shape of the scatterer only necessitates the number of the corresponding new shape factors. For a parallelogram void in a long Al rod, its shape factor can be obtained. In view of the definition of a characteristic function, the shape factor has a corresponding integral representation. Obviously, the shape factor can be considered as a Fourier transform of the characteristic function, which is reconstructed from the inverse Fourier transform. The integral equation is considered as the basic equation to reconstruct the shape of the scatterer. The identification of the geometrical character of a flaw is then given by the two dimensional inverse Born approximation in a low-frequency range. For the parallelogram void, a theoretical calculating identification is performed. At the same time, the numerical results are obtained by the finite element method.

关键词： approximation     scatterer     scattering problem     information     inverse    

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Crack fault quantitative diagnosis based on finite element of B-spline wavelet on the interval

XIANG Jia-wei, CHEN Xue-feng, HE Zheng-jia, HE Yu-min

《机械工程前沿（英文）》 2006年 第1卷 第2期   页码 177-182 doi: 10.1007/s11465-006-0001-7

摘要： The model-based forward and inverse problems in the diagnosis of structural crack faults were studied. The forward problem is to solve the natural frequencies through a cracked structural model and the inverse problem is to quantitatively determine the crack parameters using the experimental testing frequencies. Then, the one-dimensional crack element of B-spline wavelet on the interval (BSWI) was built to solve the forward problem. Contour plots of normalized crack location versus normalized crack size were plotted by using the first three natural frequencies as the inputs. The intersection of the three curves predicted the normalized crack location and size. The experimental study verified the validity of the wavelet-based crack element in solving crack singular problems to overcome the disadvantages of the traditional finite element method (FEM), such as low efficiency, insufficient accuracy, slow convergence to correct solutions, etc. At the same time, it had adequate identification precision. The new method can be applied to prognosis and quantitative diagnosis of incipient crack.

关键词： one-dimensional     B-spline     incipient     prognosis     identification precision    

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标题 作者 时间 类型 操作

Application of digital holography to circle flow bed boiler measurement

PU Shiliang, WANG Qinghui, CEN Kefa, Denis Lebrun, REN Kuanfang

期刊论文

Fractional order extremum seeking approach for maximum power point tracking of photovoltaic panels

Ammar NEÇAIBIA,Samir LADACI,Abdelfatah CHAREF,Jean Jacques LOISEAU

期刊论文

A comprehensive simulator for assessing the reliability of a photovoltaic panel peak power tracking system

Nabil KAHOUL,Mourad HOUABES,Ammar NEÇAIBIA

期刊论文

负载均衡的分布式指纹识别系统

Yun-xiang ZHAO,Wan-xin ZHANG,Dong-sheng LI,Zhen HUANG,Min-ne LI,Xi-cheng LU

期刊论文

构建二维层状结构的稠环含能材料——高能量与高稳定性的平衡

冯永安, 邓沐聪, 宋思维, 陈思同, 张庆华, Jean’ne M. Shreeve

期刊论文

Protective effects of lignin fractions obtained from grape seeds against bisphenol AF neurotoxicity via antioxidative effects mediated by the Nrf2 pathway

期刊论文

Hélène Mainaud Durand：Advances in Large Volume Metrology in Particles Accelerators（2019年10月10日）

2021年04月23日

会议视频

ne-Alpes (No.

Maiquel DE BRITO,Lauren THÉVIN,Catherine GARBAY,Olivier BOISSIER,Jomi Fred HÜBNER

期刊论文

Structural design and mechanical responses of closely spaced super-span double tunnels in strongly weathered tuff strata

Jiaxin HE; Shaohui HE; Xiabing LIU; Jinlei ZHENG

期刊论文

Comments on this special issue on “Wheat Genetics and Breeding”

Zhonghu HE, Xu LLU

期刊论文

Neighborhood form and CO

Jiaxing GUO, Huan LIU, Yang JIANG, Dongquan HE, Qidong WANG, Fei MENG, Kebin HE

期刊论文

论视觉知识

Yun-he PAN

期刊论文

Highlights of special issue on “Wheat Genetics and Breeding”

Zhonghu HE, Zhendong ZHAO, Shunhe CHENG

期刊论文

Shape reconstruction of parallelogram flaw

ZHENG Gangfeng, WU Bin, HE Cunfu

期刊论文

Crack fault quantitative diagnosis based on finite element of B-spline wavelet on the interval

XIANG Jia-wei, CHEN Xue-feng, HE Zheng-jia, HE Yu-min

期刊论文