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| 1 | EXACT SOLUTIONS FOR GENERAL VARIABLE-COEFFICIENT KdV EQUATION显示文摘By asing the nonclassical method of symmetry reductions, the exact solutions for general variable coefficient KdV equation with dissipative loss and nonuniformity terms are obtained. When the dissipative loss and nonuniformity terms don’t exist, the multisoliton solutions are found and the corresponding Painleve II type equation for the variable coefficient KdV equation is given. | Liu Xiqiang Jiang SongGraduate School, China Academy of Engineering and Physics, P.O. Box 2101, Beijing 100088 Dept. of Math., Liaocheng Teachers Univ., Shandong 252000. Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, Beiji | 2001 | Applied Mathematics(A Journal of Chinese Universities)2001，16，4： | 8 |
| 2 | Wall-modeling for large-eddy simulation of flows around an axisymmetric body using the diffuse-interface immersed boundary method显示文摘A novel method is proposed to combine the wall-modeled large-eddy simulation(LES) with the diffuse-interface direct-forcing immersed boundary(IB) method.The new developments in this method include:(i) the momentum equation is integrated along the wall-normal direction to link the tangential component of the effective body force for the IB method to the wall shear stress predicted by the wall model;(ii) a set of Lagrangian points near the wall are introduced to compute the normal component of the effective body force for the IB method by reconstructing the normal component of the velocity. This novel method will be a classical direct-forcing IB method if the grid is fine enough to resolve the flow near the wall. The method is used to simulate the flows around the DARPA SUBOFF model. The results obtained are well comparable to the measured experimental data and wall-resolved LES results. | Beiji SHI Xiaolei YANG Guodong JIN Guowei HE Shizhao WANG | 2019 | Applied Mathematics and Mechanics(English Edition)2019，40，3： | 8 |
| 3 | 当前中国煤炭经济运行态势分析显示文摘通过大量数据表述了2009年以来我国煤炭经济运行的基本态势为:煤炭市场供需基本保持平稳,煤炭产运量明显减少。近期国家出台的一系列促进经济增长的政策措施,对煤炭行业稳定发展发挥着积极作用,并针对需要进一步解决的问题,提出了相应的对策措施及其建议。 | China National Coal Association(Hepingli Beijie 21,Dongcheng District,Beijing 100713,China) | 2009 | 中国煤炭2009，，2： | 6 |
| 4 | Microstructure and Properties of W-Cu Alloys Prepared with Mechanically Activated Powder显示文摘W-15% Cu (mass fraction) alloys were sintered with mechanically activated powder in order to develop new preparing processes and improve properties of alloys. The microstructures of the activated powder and the sintered alloy were observed. Properties such as density were measured. The results show that through mechanical activation, the particle size of the powder becomes finer to sub-micron or nanometer level, some copper was soluble in tungsten, and high density W-Cu alloys can be obtained by mechanically activated powder for its action to the activation sintering. | Chengchang Jia, Xiuhu Guan, Xuekuan Su, Changheng Hou, Shimin Fan, Jun Zhao, Zizhang Xie (Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China) (Beijing Research Institute of Powder Metallurgy, Beiji | 2001 | Journal of University of Science and Technology Beijing2001，8，2： | 5 |
| 5 | A large eddy simulation of flows around an underwater vehicle model using an immersed boundary method显示文摘A large eddy simulation(LES) of the flows around an underwater vehicle model at intermediate Reynolds numbers is performed. The underwater vehicle model is taken as the DARPA SUBOFF with full appendages,where the Reynolds number based on the hull length is 1.0×105. An immersed boundary method based on the moving-least-squares reconstruction is used to handle the complex geometric boundaries. The adaptive mesh refinement is utilized to resolve the flows near the hull. The parallel scalabilities of the flow solver are tested on meshes with the number of cells varying from 50 million to 3.2 billion. The parallel solver reaches nearly linear scalability for the flows around the underwater vehicle model. The present simulation captures the essential features of the vortex structures near the hull and in the wake.Both of the time-averaged pressure coefficients and streamwise velocity profiles obtained from the LES are consistent with the characteristics of the flows pass an appended axisymmetric body. The code efficiency and its correct predictions on flow features allow us to perform the full-scale simulations on tens of thousands of cores with billions of grid points for higher-Reynolds-number flows around the underwater vehicles. | Shizhao Wang Beiji Shi Yuhang Li Guowei He | 2016 | Theoretical & Applied Mechanics Letters2016，6，6： | 5 |
| 6 | DOUBLE GLOW PLASMA SURFACE ALLOYING OF Ti6A14V AND TiAl显示文摘In order to improve the wear resistance of titanium alloy Ti6Al4V and high temperature oxidation resistance of intermetallic compound TiA1, the Double Glow Plasma Surface Alloying Technique (DG technique) was applied to modify the surface properties of these materials. Mo, Nb, Cr, Ni were diffused into the substrate materials to form alloyed layers with different properties. This paper shows the microstructures, microstructures, distributions of the alloy elements of the alloyed layers. Wear and high temperature oxidation tests were carried out. The test results indicate that the wear resistance of Ti6Al4V and the high temperature oxidation resistance of TiAl were improved significantly. | Z.Xu, L. Qin, B. Tang and Z. Y. He Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China X.S. Xie and C.L. Zheng School of Materials Science and Engineering, University of Science and Technology Beijing, Beiji | 2002 | Acta Metallurgica Sinica(English Letters)2002，15，2： | 4 |
| 7 | Femtosecond mid-IR optical vortex laser based on optical parametric chirped pulse amplification显示文摘A femtosecond mid-infrared optical vortex laser can be used for high harmonic generation to extend cutoff energy to the kilo-electron-volt range with orbital angular momentum,as well as other secondary radiations.For these,we demonstrate a high-energy femtosecond 4μm optical vortex laser based on optical parametric chirped pulse amplification(OPCPA)for the first time.The optical vortex seed is generated from a femtosecond 4μm laser by a silicon spiral phase plate with the topological charge l of 1 before the stretcher.Through using a two-stage collinear OPCPA amplifier,the chirped vortex pulse is amplified to 12.4 m J with 200 nm full width at half-maximum bandwidth.After compression,the vortex laser pulse with 9.53 m J,119 fs can be obtained.Furthermore,the vortex characteristics of the laser beam are investigated and evaluated.This demonstration can scale to generate a higher-peak-power vortex mid-IR laser and pave a new way for high field physics. | JUNYU QIAN YUJIE PENG YANYAN LI PENGFEI WANG BEIJIE SHAO ZHE LIU YUXIN LENG RUXIN LI | 2020 | Photonics Research2020，8，3： | 4 |
| 8 | Synthesis of N-acetamide C_(60) nitride and its performance of optical limiting显示文摘N-acetamide C60 nitride (N-acetamide-1,2-dihydro-1,2-aza-fullerene[60]) has been synthesized by the reaction of C60 and azidoacetamide and initially characterized. Its mechanism was that the objective product is formed through intermediate triazoline. The computational study shows that N-nitride structure is thermodynamically more stable by using the semi-empirical AM1 SCF-MO method. The properties of optical limiting were tested by using double frequency Nd: YAG pulse laser system and showed that the optical limiting mechanism is reverse saturation absorption. At wavelength of 532 nm, compared with optical limiting for ns pulse, this new material has good optical limiting character for ps pulse. At wavelength of 707 nm. the capacity of optical limiting of the derivative is prior to C60- | TANG Guangshi, ZHU Hesun & SONG Yinglin Research Center of Materials Science, Beijing Institute of Technology, Beijing 100081, China Department of Applied Physics, Harbin Institute of Technology. Harbin 150001. China Department of Applied Chemiscy Beiji | 2000 | Chinese Science Bulletin2000，45，2： | 4 |
| 9 | Fusion Visual Attention and Low-Level Features in Images for Region of Interest Extraction显示文摘 | CHEN Zailiang ZOU Beiji GAO Xu SHEN Hailan ZHANG Xiaoyun | 2013 | Chinese Journal of Electronics2013，22，2： | 3 |
| 10 | Failure Detection and Correction for Appearance Based Facial Tracking显示文摘The appearance based facial tracking methods, such as active appearance models and candide models, are widely used in intelligent user interface and facial expression recognition. This paper proposes a novel method to detect and correct the failures in appearance based facial tracking. A sparse coding strategy is applied to learn an efficient feature representation for the difference between the warped image and the face template. The features are extracted by directly pro ject the difference image to the space spanned by the dictionary of the sparse coding. An iterative regression based method is proposed to detect and correct the failures according to the features. Experimental evaluation on an open dataset shows a global performance improvement of the tracking algorithm. | WANG Lei LIANG Yixiong CAI Wangyang ZOU Beiji | 2015 | Chinese Journal of Electronics2015，24，1： | 3 |
| 11 | High-repetition-rate, high-peak-power 1450 nm laser source based on optical parametric chirped pulse amplification显示文摘We present a high-peak-power,near-infrared laser system based on optical parametric chirped pulse amplification pumped by a home-built picosecond pumping laser,which can generate over 40 mJ energy at 1450 nm center wavelength and operate at 100 Hz repetition rate.Subsequently,the chirped laser pulses are compressed down to 60 fs with 26.5 mJ energy,corresponding to a peak power of 0.44 TW. This high-energy,long-wavelength laser source is highly suitable for driving various nonlinear optical phenomena,such as high-order harmonic generation and high-flux coherent extreme ultraviolet/soft X-ray radiation. | Pengfei Wang Beijie Shao Hongpeng Su Xinlin Lv Yanyan Li Yujie Peng Yuxin Leng | 2019 | High Power Laser Science and Engineering2019，7，2： | 2 |
| 12 | Realistic Cosmetic Plastic Surgery Simulation Based on the Golden Ratio显示文摘Facial cosmetology is usually operated by surgeons on the basis of clinical experiences and is full of risks because of the lack of objective criteria and auxiliary tools. The available plastic simulation systems are not easy to manipulate. This paper presents a realistic cosmetic plastic surgery simulation framework guided automatically by golden ratio data, which is suitable for personalized realistic facial models from 3D laser scan. A golden ratio facial mask is made based on the ideal golden ratio facial mask data, with reference to the facial ratio of goodlooking groups of eastern people. The plastic design for the region of interest will be driven automatically by Laplacian coordinates deformation, based on the matched characteristic points and lines of the golden ratio facial mask to set the boundary conditions. The evaluation from clinical surgeons shows that the new plastic simulation system is practical and will be widely used in clinical operations. | LI Jianfeng LIAO Shenghui LU Rongbo TENG Juan LUO Xiong ZOU Beiji | 2016 | Chinese Journal of Electronics2016，25，5： | 2 |
| 13 | Saliency-Based Segmentation of Optic Disc in Retinal Images显示文摘Accurate segmentation of Optic disc(OD)is significant for the automation of retinal analysis and retinal diseases screening. This paper proposes a novel optic disc segmentation method based on the saliency. It includes two stages: optic disc location and saliency-based segmentation. In the location stage, the OD is detected using a matched template and the density of the vessels.In the segmentation stage, we treat the OD as the salient object and formulate it as a saliency detection problem.To measure the saliency of a region, the boundary prior and the connectivity prior are exploited. Geodesic distance to the window boundary is computed to measure the cost the region spends to reach the window boundary.After a threshold and ellipse fitting, we obtain the OD.Experimental results on two public databases for OD segmentation show that the proposed method achieves thestate-of-the-art performance. | ZOU Beiji LIU Qing YUE Kejuan CHEN Zailiang CHEN Jie ZHAO Guoying | 2019 | Chinese Journal of Electronics2019，28，1： | 2 |
| 14 | A Neuro-Fuzzy Crime Prediction Model Based on Video Analysis显示文摘A hybrid neuro-fuzzy model for predicting crime in a wide area such as a town or district in presented.The model is built using what we describe as crime indicator events extracted from simulated wide area surveillance network. The framework principally involves two phases,namely video analysis and crime modeling phases. In video analysis a concept based approach for video event detection is used to detect crime indicator events. Based on the extracted indicators with other related variables, a fuzzy inference system capable of learning is constructed in the second phase. The model is constructed using Violent scene detection(VSD) 2014 dataset and testing is done using UCR-Videoweb dataset. The experimental results show that the proposed method is quite demonstrative and promising. | ZOU Beiji Nurudeen Mohammed ZHU Chengzhang ZHANG Ziqian ZHAO Rongchang WANG Lei | 2018 | Chinese Journal of Electronics2018，27，5： | 2 |
| 15 | Pulse combination and compression in hollow-core fiber for few-cycle intense mid-infrared laser generation显示文摘The generation of high-peak-power,few-cycle mid-infrared(MIR)pulses using coherent beam combination and nonlinear pulse compression techniques simultaneously is demonstrated.The two pulses,with identical pulse energy of 2.8 mJ and pulse duration of 160 fs,are coherently combined at the input end of a krypton-filled hollow-core fiber(HCF),and then the bandwidth of the combined pulse is broadened to near an optical octave due to strong phase modulations,and the temporal width is compressed into a few-cycle regime.Finally,a 2.7 mJ,22.9 fs,20 Hz laser at 4μm can be obtained,and the pulse peak power is greatly enhanced compared with that of conventional single-channel optical parametric chirped pulse-amplification systems.Furthermore,the peak power generated from this system has the prospect of further scaling up through use of more channels of coherent combination,which can pave a way to generate higher peak power ultra-intense MIR pulses for strong-field physics. | Junyu Qian Pengfei Wang Yujie Peng Yanyan Li Beijie Shao Hongpeng Su Xinlin Lv Ding Wang Yuxin Leng Ruxin Li | 2021 | Photonics Research2021，9，4： | 2 |
| 16 | Retrograde intubation dacryocystorhinostomy for proximal and midcanalicular obstruction显示文摘 | Wearne MJ Beiji B Davis G | 1999 | Ophthalmology1999，106，12： | 1 |
| 17 | An Ensemble Retinal Vessel Segmentation Based on Supervised Learning in Fundus Images显示文摘An ensemble method based on supervised learning for segmenting the retinal vessels in color fundus images is proposed on the basis of previous work of Zhu et al. For each pixel, a 36 dimensional feature vector is extracted, including local features, morphological transformation with multi-scale and multi-orientation, and divergence of vector field which is firstly used to extract feature of retinal image pixels. Then the feature vector is used as input data set to train the weak classifiers by the Classification and regression tree(CART). Finally, an Ada Boost classifier is constructed by iteratively training for the retinal vessels segmentation. The experimental results on the public Digital retinal images for vessel extraction(DRIVE)database demonstrate that the proposed method is efficient and robust on the fundus images with lesions when compared with the other methods. Meanwhile, the proposed method also exhibits high robustness on a new Retinal images for screening(RIS) database. The average accuracy,sensitivity, and specificity of improved method are 0.9535,0.8319 and 0.9607, respectively. It has potential applications for computer-aided diagnosis and disease screening. | ZHU Chengzhang ZOU Beiji XIANG Yao CUI Jinkai WU Hui | 2016 | Chinese Journal of Electronics2016，25，3： | 1 |
| 18 | Current situation and trend of arable land change in China显示文摘How to protect arable land in the process of economic development and urbanization is a critical issue in China. In this paper, an attempt is made to analyze the situation of arable land change in China and it’s relationship with population growth, economic development and urbanization. In depth analysis is also made in different regions. Forecasting is conducted to show the trend of arable land change in China based on the results of correlation analysis. Some suggestions are put forward for the policy making of reasonable utilization and protection of arable land in the future. | Received date: 1999-11-02 MENG Xiang-jing1 , JIA Shao-feng 2 (1.Institute of Population Research, People’s University of China, Beijing 100872, China 2. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beiji | 2000 | Journal of Geographical Sciences2000，10，3： | 1 |
| 19 | Similarity Comparison of Protein Based on Spherical Polar Coordinates 显示文摘 | BEIJI ZOU QI ZHANG LUMING LIANG | 2009 | Computer aided geometric design and graphics journal2009，21，5： | 1 |
| 20 | Nonlocal Orientation Diffusion Partial Differential Equation Model for Optics Image Denoising 显示文摘 | Qiao Naosheng Zou Beiji | 2013 | Optik2013，124，14： | 1 |
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