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铝型材静电粉末喷涂模型的研究与应用

机械设计与制造 2024年第5期399卷 179-184页

作者：林轶韬刘建群许东伟高伟强广东工业大学机电工程学院广东广州510006 佛山智昂科技有限公司广东佛山528225

针对实际生产中企业为实现铝型材表面均匀涂层而耗费巨大人力物力的问题,提出了一种适用于生产实际的变高斯分布模型。通过对铝型材静电粉末喷涂影响因素的分析,使用控制变量法进行定点和连续喷涂实验,获得涂层厚度实验数据,基于高斯分... 详细信息

针对实际生产中企业为实现铝型材表面均匀涂层而耗费巨大人力物力的问题,提出了一种适用于生产实际的变高斯分布模型。通过对铝型材静电粉末喷涂影响因素的分析,使用控制变量法进行定点和连续喷涂实验,获得涂层厚度实验数据,基于高斯分布对定点实验数据进行拟合,对于拟合模型存在的远离中心截面偏差问题,采用变峰值宽度的方式对模型进行优化修正,进一步提高了模型与实验数据的拟合程度,在此基础上,通过实验数据分析了静电电压、粉末流量、喷涂速度对膜厚分布的影响,建立了不同参数下静电粉末喷涂涂层的变高斯分布模型。最后进行了喷涂实验,铝型材成品的膜厚分布情况符合模型仿真预测的结果,表明该模型能准确预测不同参数下铝型材的膜厚分布情况,在生产实际中,模型的应用可以为均匀涂层提供可靠的仿真参考和生产指导,有效减少企业调试参数的次数,提高了企业的生产效率。

关键词：铝型材静电粉末喷涂涂层厚度变高斯分布仿真预测

凹凸形周期结构遮障面的雷达及红外隐身性能分析

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激光与红外 2024年第4期54卷 593-598页

作者：李浩许卫东肖菲菲俞宙吴昌峰黄伟陆军工程大学江苏南京210000

为了提高遮障面的雷达及红外隐身效果,采用外形隐身技术,设计了一种具有凸起和凹陷的周期结构遮障面。首先建立4种不同形状的模型,进行电磁仿真计算并与实验测量结果进行对比,结果显示仿真与实验数据相关系数在09以上,仿真结果准确可用... 详细信息

为了提高遮障面的雷达及红外隐身效果,采用外形隐身技术,设计了一种具有凸起和凹陷的周期结构遮障面。首先建立4种不同形状的模型,进行电磁仿真计算并与实验测量结果进行对比,结果显示仿真与实验数据相关系数在09以上,仿真结果准确可用。其次分析各模型的电磁散射机理,为遮障面外形设计提供理论基础。然后设计具有起伏特征的遮障面,经过仿真计算,发现凸起和凹陷程度半径r达到24mm时,遮障面反射系数小于-10dB,r达到28mm时反射系数小于-17dB。最后,在遮障面的凸起部分填充隔热材料,仿真其覆盖在运行温度为80℃的装(设)备上,发现具有隔热材料的遮障面温度降低35℃,具有一定的红外伪装效果。

关键词：遮障起伏隐身雷达技术红外技术

Controlling Single-Photon Transport along an Optical Waveguide by using a Three-Level Atom

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Chinese Physics Letters 2012年第3期29卷 13-16页

作者： TIAN wei CHEN Bin xu wei-dong Business School University of Shanghai for Science and TechnologyShanghai 200093 Tin Ka-Ping College of Science University of Shanghai for Science and TechnologyShanghai 200093 School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093

We theoretically investigate the single-photon transport properties in an optical waveguide embedded with a V-type three-level atom(VTLA)based on symmetric and asymmetric couplings between the photon and the *** numerical results show that the transmission spectrum of the incident photon can be well controlled by virtue of both symmetric and asymmetric coupling interactions.A multifrequency photon attenuator is realized by controlling the asymmetric coupling ***,the influences of dissipation of the VTLA for the realistic physical system on single-photon transport properties are also analyzed.

关键词： multifrequency waveguide Waveguide

Real-time road traffic states estimation based on kernel-KNN matching of road traffic spatial characteristics

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Journal of Central South University 2016年第9期23卷 2453-2464页

作者： xu dong-wei College of Information Engineering Zhejiang University of Technology Hangzhou 310023 China State Key Laboratory of Rail Traffic Control and Safety (Beijing Jiaotong University) Beijing 100044 China

The accurate estimation of road traffic states can provide decision making for travelers and traffic managers. In this work,an algorithm based on kernel-k nearest neighbor(KNN) matching of road traffic spatial characteristics is presented to estimate road traffic states. Firstly, the representative road traffic state data were extracted to establish the reference sequences of road traffic running characteristics(RSRTRC). Secondly, the spatial road traffic state data sequence was selected and the kernel function was constructed, with which the spatial road traffic data sequence could be mapped into a high dimensional feature space. Thirdly, the referenced and current spatial road traffic data sequences were extracted and the Euclidean distances in the feature space between them were obtained. Finally, the road traffic states were estimated from weighted averages of the selected k road traffic states, which corresponded to the nearest Euclidean distances. Several typical links in Beijing were adopted for case studies. The final results of the experiments show that the accuracy of this algorithm for estimating speed and volume is 95.27% and 91.32% respectively, which prove that this road traffic states estimation approach based on kernel-KNN matching of road traffic spatial characteristics is feasible and can achieve a high accuracy.

关键词： road traffic kernel function k nearest neighbor (KNN) state estimation spatial characteristics

The Addition Reaction of p-Chlorobenzaldoxime Dehydrodimer with 1,3-Dienes

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Chemical Research in Chinese Universities 1998年第3期14卷 51-54页

作者： ZHANG xu wei xu-dong HU Yue-fei HU Hong-wen Department of Chemistry Nanjing UniversityNanjing210093

The addition reaction of p chlorobenzaldoxime dehydrodimer and 1,3 dienes in refluxing chloroform gives linear 1,4 addition products. The reaction is probably a free radical process.

关键词： Addition reaction Iminoxy radical 1 3 Diene

Middle thyroid vein tumor thrombus in metastatic papillary thyroid microcarcinoma:A case report and review of literature

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World Journal of Clinical Cases 2022年第10期10卷 3213-3221页

作者： Yan Gui Jun-Yi Wang xu-dong wei Department of Otorhinolaryngology Head and Neck Surgery The First Hospital of Lanzhou UniversityLanzhou 730000Gansu ProvinceChina Department of Thyroid and Neck Tumor Key Laboratory of Cancer Prevention and Therapy of TianjinTianjin Medical University Cancer Institute and HospitalNational Clinical Research Center for CancerTianjin 300060China Department of Otorhinolaryngology Head and Neck Surgery Gansu Provincial HospitalLanzhou 730000Gansu ProvinceChina

BACKGROUND Although papillary thyroid microcarcinoma(PTMC)is not considered a threatening tumor,in some cases,it can be *** thrombosis of papillary thyroid carcinoma,follicular thyroid carcinoma,Hürthle cell carcinoma,poorly differentiated thyroid carcinoma and anaplastic thyroid carcinoma have been reported in the literature,but there have been no reports about *** SUMMARY A 45-year-old woman presented with a thyroid mass and thrombosis in a middle thyroid vein during a physical *** had no symptoms,and the physical examination showed no positive *** ultrasonographyguided fine-needle aspiration biopsy results indicated an atypical lesion of ambiguous significance,with some actively growing cells(TBSRTCⅢ)and the BRAFV600E mutation not *** patient underwent left thyroidectomy,isthmus lobectomy,prophylactic central lymph node dissection and *** pathology showed papillary microcarcinoma of the left thyroid,and the thrombus in the middle thyroid vein was a tumor *** Middle thyroid vein tumor thrombus is an extremely rare condition in PTMC,but it does *** and thromboembolectomy may be an option for patients with thrombi in the middle vein of the thyroid,and we strongly suggest close follow-up of these patients.

关键词： Thyroid neoplasms Papillary carcinoma Thyroid vein Venous thrombosis Surgery Case report

Time Dependence of Entropy Flux and Entropy Production of a Dissipative Dynamical System Driven by Non-Gaussian Noise

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Communications in Theoretical Physics 2008年第6期49卷 1561-1566页

作者： GUO Yong-Feng xu wei LI dong-Xi XIE Wen-Xian Department of Applied Mathematics Northwestern Polytechnical University Xi＇an 710072 China

A stochastic dissipative dynamical system driven by non-Gaussian noise is investigated. A general approximate Fokker-Planck equation of the system is derived through a path-integral approach. Based on the definition of Shannon＇s information entropy, the exact time dependence of entropy flux and entropy production of the system is calculated both in the absence and in the presence of non-equilibrium constraint. The present calculation can be used to interpret the interplay of the dissipative constant and non-Gaussian noise on the entropy flux and entropy production.

关键词： information entropy entropy flux and entropy production non-Gaussian noise Fokker-Planck equation

Vertical Price Transmission in the China's Layer Industry Chain:an Application of FDL Approach

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Agricultural Sciences in China 2011年第11期10卷 1812-1823页

作者： xu Shi-wei dong Xiao-xia LI Zhe-min LI Gan-qiong Key Laboratory of Digital Agricultural Early-Warning Technology Ministry of Agriculture~Agricultural Information Institute ChineseAcademy of Agricultural Sciences Beijing 100081 P.R.China

This paper examines the vertical price relationship between upstream and downstream products in China＇s layer industry chain by estimating elasticity coefficients of the price transmission. We use cointegration tests, error correction models and finite distributed lag models to analyze vertical price shifts between corn, layer feed, egg-laying chicken and egg prices. With monthly data from 1994 to 2010, our results show that various prices in China＇s layer industry chain are well integrated. In addition, our results indicate that both long-run and short-run price relationships between upstream and downstream products in layer industry chain exist and the long-run equilibrium, to a certain extent, may eliminate the short-run dynamics price deviation. We also found that the influence of corn and feed prices on egg prices is still more remarkable than egg-laying chicken prices. Our findings imply that governments should pay more attention to corn and layer feed prices in order to stabilize egg prices under the conditions of market integration.

关键词： finite distributed lag model vertical price transmission layer industry chain China

Fast source mask co-optimization method for high-NA EUV lithography

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Opto-Electronic Advances 2024年第4期7卷 44-54页

作者： Ziqi Li Lisong dong xu Ma Yayi wei EDA Center Institute of Microelectronics of Chinese Academy of SciencesBeijing 100029China Key Laboratory of Photoelectronic Imaging Technology and System of Ministry of Education of China School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China University of Chinese Academy of Sciences Beijing 100049China Guangdong Greater Bay Area Applied Research Institute of Integrated Circuit and Systems Guangzhou 510700China

Extreme ultraviolet(EUV)lithography with high numerical aperture(NA)is a future technology to manufacture the integrated circuit in sub-nanometer ***,source mask co-optimization(SMO)is an extensively used approach for advanced lithography process beyond 28 nm technology *** work proposes a novel SMO method to improve the image fidelity of high-NA EUV lithography system.A fast high-NA EUV lithography imaging model is established first,which includes the effects of mask three-dimensional structure and anamorphic ***,this paper develops an efficient SMO method that combines the gradient-based mask optimization algorithm and the compressivesensing-based source optimization algorithm.A mask rule check(MRC)process is further proposed to simplify the optimized mask *** illustrate that the proposed SMO method can significantly reduce the lithography patterning error,and maintain high computational efficiency.

关键词： computational lithography high-NA EUV lithography source-mask co-optimization lithography imaging model