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Studies on Electrochemical Property of LiFePO_4/C as Cathode Material for Lithium Ion Batteries

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Chemical Research in Chinese Universities 2006年第1期22卷 73-75页

作者： HUANG Xiao-wen shi Peng-fei Faculty of Applied Chemistry Harbin Institute of Technology Harbin 150001 P.R. China College of Material Science and Engineering Shandong University of Science and Technology Qingdao 266510 P. R. China

LiFePO4/C samples were prepared at different temperatures by adding sngar to the synthetic precursor. The samples were characterized by X-ray diffraction（XRD）. Their crystal phases show an olivine structure. Only the sample obtained at 700℃ has a larger discharge capacity, which has good electrochemical properties： its discharge specific capacity is 120. 3 mAh/g at a current of 0. 05 mA, and its capacity fade is very low after 20 cycles. It is demonstrated that the best synthetic temperature should be 700℃.

关键词： Olivine Lithium ion battery Carbon-coated LiFePO4

Rural transformation,income growth,and poverty reduction by region in China in the past four decades

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Journal of Integrative Agriculture 2023年第12期22卷 3582-3595页

作者： shi Peng-fei HUANG Ji-kun China Center for Agricultural Policy School of Advanced Agricultural SciencesPeking UniversityBeijing 100871P.R.China Research Center for Rural Economy Ministry of Agriculture and Rural AffairsBeijing 100810P.R.China

China has experienced rapid rural transformation in the past four *** the rapid transformation is a significant rise in rural household income and a substantial fall in rural *** paper examines the evolutions of and the relationships between rural transformation(high-value agriculture and rural non-farm employment)and its outcomes(per capita rural income and rural poverty incidence)using provincial-level *** results show that 31 provinces/autonomous regions/municipalities have undergone significant rural transformation,but the level and speed of rural transformation differed ***,an increased level of rural transformation is often associated with higher per capita rural income and reduced rural poverty ***,a category of provincial rural transformation based on high-value agriculture and rural non-farm employment is also *** further discuss the likely impacts of institutions,policies,and investments(IPIs)on rural transformation and conclude with policy implications.

关键词： rural transformation high-value agriculture non-farm employment income poverty China

Design and characterization study of dual D-shaped no-core fiber based SPR sensor for refractive index and temperature measurement

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Optoelectronics Letters 2025年

作者： Liu Yinggang Li Rui Li fei Xu Xinyi Zhou Rui Shaanxi Engineering Research Center of Oil and Gas Resource Optical Fiber Detection & Shaanxi Key Laboratory of Measurement and Control Technology for Oil and Gas wells， Xi'an shiyou University

To address the issue of temperature cross-sensitivity in refractive index （RI） measurement， a fiber-optic Surface Plasmon Resonance （SPR） sensor based on dual D-shaped no-core fiber （NCF） is proposed and designed. The sensor mainly consists of D-shaped NCF， Ag/Fe2O3composite film， and polydimethylsiloxane （PDMS）， where the silver and Fe2O3are successively coated on both D-shaped surfaces of NCF to generate SPR and enhance the oxidation resistance. The layer of PDMS coated on one D-shaped surface acts as a tunable ambient medium sensing the temperature variation and affecting the transmission spectrum of the sensor. Since the surface plasmon waves are excited in the two D-shaped surfaces with different films， the two RI and temperature-dependent spectral resonance peaks with different wavelengths will be produced. Research results demonstrate that the two peaks’ wavelengths have different responses to the variations of ambient RI and temperature. In the refractive index range of 1.36-1.376 and temperature range of 10-100 °C， the RI and temperature sensitivities reach to 5000 nm/RIU and -0.546 nm/°C， respectively. With the sensitivity coefficient matrix， simultaneous measurement of refractive index and temperature can be realized， and the corresponding accuracy is superior to 0.4×10-5RIU and 0.037°C.

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PVIIAD: industrial visual anomaly detection method based on partially visible image inpainting

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Optoelectronics Letters 2025年

作者： WU Qiliang fei Dongce YAO Minghui NIU Yan WANG Cong School of Aeronautics and Astronautics， Tiangong University School of Artificial Intelligence， Tiangong University

Industrial anomaly detection is dedicated to identifying and locating regions that deviate from the standard appearance. The prevailing approach achieves unsupervised anomaly detection through the reconstruction of images using autoencoders. Due to the simplistic structure of some abnormal regions， the autoencoder can effectively reconstruct these areas， consequently diminishing the model's anomaly detection capabilities. To address this issue， this paper transforms the reconstruction task into the inpainting-filling-reconstruction task to increase the reconstruction error between abnormal samples and normal samples. In PVIIAD， the masked regions inpainted by the filling network are used to fill in the input image， thereby achieving an effect similar to masking. Unlike typical masking processes， this approach retains partial authentic information in the input image， rendering it partially visible. This is beneficial for the reconstruction network to repair the masked areas. Due to the consistent structure between the masked region inpainted by the filling network and the normal region， the filled abnormal regions display a complex structure that has not been learned， making it difficult for the reconstruction network to reconstruct the abnormal regions. Experimental results indicate that PVIIAD performs better than other methods on both the MVTec AD dataset and the MVTec LOCO AD dataset.

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Intelligent interaction system based on multimodal conformal triboelectric nanogenerator patch for disabled sports and life

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Science China Technological Sciences 2025年

作者： Yuzhang WEN Mengqi ZHANG Zhenning XIE Zida AN Bing LIU Fengxin SUN Tianming ZHAO Zuojun YU fei WANG Yupeng MAO Physical Education Department Northeastern University(Shenyang) Faculty of Robot Science and Engineering Northeastern University Criminal Investigation Police University of China State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences China Ice Sports College Beijing Sport University

Intelligent interaction technology based on advanced sensing units has become a research hotspot. In this paper, an intelligent interaction system (IIS) based on a multimodal conformal triboelectric nanogenerator patch (MCTP) is reported for sports monitoring and life promotion of the disabled. This IIS consists of a cloud-based smart sports recognition program and a smart life application. The porous micro-reinforced structure of polyurethane (PU) Sponge&Ecoflex, and the surface modification of PTFE by coating it with MXene endows the MCTP with excellent electrical properties. It shows good angle and force sensitivities of 1.1 V/°and 1.61 V/N, respectively, and has an ultra-fast response time of 15 ms, meeting the needs of human motion monitoring. The MCTP can also capture the mechanical energy, producing a maximum output power of 139μ*** with the commercial inertial measuring unit (IMU), the MCTP shows better consistency in human joint angle sensing. A precise analysis of wheelchair curling sports monitoring points is achieved by combining the MCTP and the human anatomy model. The cloud-based smart sports recognition program utilizes machine learning to achieve visual feedback on the three throwing technologies of draw, takeout and clearing. In addition, the developed smart life application uses a highsensitivity MCTP-sensor array design to achieve a variety of smart home interactions through simple finger touches. Overall,the IIS integrates the three major functions of smart sports sensing, energy capture, and smart home control, providing important application prospects in the fields of smart sports and human-computer interaction for the disabled.

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Controllable synthesis of novel mono-and di-terpyridine derivatives

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Chinese Chemical Letters 2009年第2期20卷 168-170页

作者： Peng fei shi Qin Jiang Chemistry Department Huaihai Institute of Technology Lianyungang 222005 China State Key Laboratory of Coordination Chemistry Nanjing University Nanjing 210093 China

A series of novel mono- and di-terpyridine derivatives with purinyl and pyrimidyl group were obtained from the reaction of 4′-p- bromomethylphenyl-2,2′：6,2″-terpyridine with 6-mercaptopurine, 2,6-dimercaptopurine and thymine, respectively. The active hydrogens on these alkaloids could be abstracted stepwise using different bases, which made the addition controllable.

关键词： Terpyridine Thymine Mercaptopurine

Dynamics of Commuting Rational Maps on Berkovich Projective Space over C_p

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Acta Mathematica Sinica,English Series 2013年第8期29卷 1459-1478页

作者： shi Lei FAN Yue fei WANG Institute of Applied Mathematics AMSSChinese Academy of Sciences Institute of Mathematics AMSSChinese Academy of Sciences

We study the dynamics of commuting rational maps with coefficients in Cp. By lifting the dynamics from P1（Cp） to Berkovich projective space P1 Berk, we prove that two nonlinear commuting maps have the same Berkovich Julia set and the same canonical measure. As a consequence, two nonlinear commuting maps with coefficient in Cp have the same classical Julia set. We also prove that they have the same pre-periodic Berkovich Fatou components.

关键词： Non-Archimedean field Berkovich projective line Fatou set Julia set

New Periodic Solutions for a Class of Singular Hamiltonian Systems

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Acta Mathematica Sinica,English Series 2013年第6期29卷 1205-1218页

作者： Peng fei YUAN shi Qing ZHANG Department of Mathematics Sichuan University

In this paper, we apply a variant of the famous Mountain Pass Lemmas of Ambrosetti-Rabinowitz and Ambrosetti-Coti Zelati with （PSC）c type condition of Palais-Smale-Cerami to study the existence of new periodic solutions with a prescribed energy for symmetrical singular second order Hamiltonian conservative systems with weak force type potentials.

关键词： Singular Hamiltonian systems periodic solutions Mountain Pass Lemma Palais–Smale–Cerami condition

A numerical study of the summer circulation in the southwestern Yellow Sea

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Acta Oceanologica Sinica 2016年第11期35卷 1-8页

作者： shi fei LUO Yiyong RONG Zengrui College of Oceanic and Atmospheric Sciences Ocean University of China Physical Oceanography Laboratory Ocean University of China

The Regional Ocean Modeling System（ROMS） is used to study the summer circulation in the southwestern Yellow Sea（SWYS）. The modeled currents show good agreement with observations from both drifters and moorings. While the summer current in the SWYS flows consistently northeastward on the surface with large magnitude offshore, the current below the surface layer features a cyclonic circulation roughly along the 25 m isobath. The effect of a surface wind stress and bottom thermal fronts on the circulation is investigated through a series of process-oriented numerical experiments. It is found that the southeasterly wind dominates the surface current, whereas the bottom thermal fronts, which are formed in a transition area between the vertically well-mixed region and the stratified region, are responsible for the cyclonic circulation below the surface.

关键词： southwestern Yellow Sea (SWYS) Lunan (South Shandong Province China) Trough bottom thermalfronts summer circulation