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| 1 | Inductance calculation for 3D microsolenoids with single-layer coils显示文摘Three-dimensional(3D) single-layer microcoils have always been a key element for electromagnetic systems;but they lack an easy and accurate method to calculate the inductance value for their complex 3D micro-structures. This paper employed a curve-fitting process to obtain the associated equation for the inductance value and geometric parameters based on the simulation results. The correction factors regarding helical pitch and wire diameter were reviewed,which are used for compensation in the Nagaoka formula. The simulation process numerically simulated the performance of the 3D microcoils using a FEM electro-magnetic-coupled analysis method. Comparison of the simulated inductance value and the Nagaoka formula was undertaken,which shows that the helical pitch and wire diameter contribute a main role in the calculation error. The derived formula was expressed in a concise form to precisely calculate the inductance value of 3D microsolenoids with single-layer coils. | LIU Keyin YANG Qing CHEN Feng ZHAO Yulong MENG Xiangwei SHAN Chao LI Yanyang | 2014 | Instrumentation2014，1，2： | 6 |
| 2 | Design and simulation of a 12-phase flywheel energy storage generator system with linearly dynamic load显示文摘 | WEI Keyin LIU Dezhi MENG Jin | | 0，，03： | 1 |
| 3 | Design and simulation of a 12-phase flywheel energy storage generator system with linearly dynamic load显示文摘 | Wei Keyin Liu Dezhi Meng Jin | 2010 | IEEE Transactions on Applied Superconductivity2010，20，3： | 1 |
| 4 | Thermal omens before earthquake显示文摘 | Liu Defu Peng Keyin Liu Weihe | 1999 | Acta Seismologica Sinica1999，12，6： | 1 |
| 5 | Litchi detection in the field using an improved YOLOv3 model显示文摘Due to the illumination,complex background,and occlusion of the litchi fruits,the accurate detection of litchi in the field is extremely challenging.In order to solve the problem of the low recognition rate of litchi-picking robots in field conditions,this study was inspired by the ideas of ResNet and dense convolution and proposed an improved feature-extraction network model named“YOLOv3_Litchi”,combining dense connections and residuals for the detection of litchis.Firstly,based on the traditional YOLOv3 deep convolution neural network and regression detection,the idea of residuals was to be put into the feature-extraction network to effectively avoid the problem of decreasing detection accuracy due to the excessive depths of the network layers.Secondly,under the premise of a good receptive field and high detection accuracy,the large convolution kernel was replaced by a small convolution kernel in the shallow layer of the network,thereby effectively reducing the model parameters.Finally,the idea of feature pyramid was used to design the network to identify the small target litchi to ensure that the shallow features were not lost and simultaneously reduced the model parameters.Experimental results show that the improved YOLOv3_Litchi model achieved better results than the classic YOLOv3_DarkNet-53 model and the YOLOv3_Tiny model.The mean average precision(mAP)score was 97.07%,which was higher than the 95.18%mAP of the YOLOv3_DarkNet-53 model and the 94.48%mAP of the YOLOv3_Tiny model.The frame frequency was 58 fps,which was higher than 29 fps of the YOLOv3_DarkNet-53 model.Compared with the classic Faster R-CNN model with the feature-extraction network VGG16,the mAP was increased by 1%,and the FPS advantage was obvious.Compared with the classic single shot multibox detector(SSD)model,both the accuracy and the running efficiency were improved.The results show that the improved YOLOv3_Litchi model had stronger robustness,higher detection accuracy,and less computational complexity for the identification of litchi in the field conditions,which should be helpful for litchi orchard precision management. | Hongxing Peng Chao Xue Yuanyuan Shao Keyin Chen Huanai Liu Juntao Xiong Hu Chen Zongmei Gao Zhengang Yang | 2022 | International Journal of Agricultural and Biological Engineering2022，15，2： | 0 |
| 6 | Variation of Seismic Frequency in the Yunnan Region After the Indonesia Earthquake With M_S8.7显示文摘The seismic frequency increased significantly in the Yunnan region after the Indonesia earthquake with M_S8.7 on December 26, 2004. This was estimated by analyzing the seismic frequency ratio between the influenced and normal times, the spatial distribution characteristics of the increased seismic frequency, the temporal-spatial distribution and types of seismic swarms. Seismic frequency increased at 71.3% of the statistical sites in the Yunnan area. The maximal increase ratio is 18.2. | Guo Tieshuan Liu Jie Zheng Dalin Peng Keyin | 2007 | Earthquake Research in China2007，21，1： | 0 |
| 7 | Formation and regulation of supramolecular chirality in organogel via addition of tartaric acid显示文摘A new 1,8-naphthalimide derivative was prepared in which the C-4 position was substituted by pyridin-4-ol.This derivative shows good gelation property that can gelate most of polar solvents.As an achiral molecule,helical fibre morphology was observed when the compound gelated acetone solvent.When 0.5 eq of D-tartaric acid or L-tartaric acid was added to the gel,the helical morphology was changed from left-handed to right-handed structure.This result was further proved by circular dichroism measurement.FT-IR experiment showed the formation of intermolecular H-bond between the gelator and tartaric acid.The photophysical properties of gelator had no difference before and after addition of tartaric acid;whereas the lamellar structure was varied by addition of tartaric acid. | CAO XinHua ZHANG MingMing LIU KeYin MAO YueYuan LAN HaiChuang LIU Bin YI Tao | 2012 | Chinese Science Bulletin2012，57，33： | 0 |
| 8 | A Glimpse of Iron and Steel Industry of China in Recent Years显示文摘The paper briefs the recent development of China’s Iron & Steel Industry from the view of a refractories worker. Some data and statistics have been revealed in the paper including total output of steel, geological distribution of key steel enterprises, productivity, facilities, technical and economical indices as well as technical advance achieved in the last ten years. Structural adjustment and consolidation occurred in China’s Iron & Steel Industry has also been described. The views on how much steel is demanded in China in the near future advanced by a steel expert has been accepted as the conclusion of the paper. | LIU Jiehua ZHANG Xiaobui SHEN Keyin WANG Jing | 2006 | China's Refractories2006，15，4： | 0 |
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