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An Active Stereo Vision System Based on Neural Pathways of Human Binocular Motor System

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Journal of Bionic Engineering 2007年第4期4卷 185-192页

作者： yu-zhang Gu Makoto Sato Xiao-lin zhang Department of Advanced Applied Electronics Tokyo Institute of Technology 4259 Nagatsuda Midori-ku Yokohama 226-8503 Japan Precision and Intelligence Laboratory Tokyo Institute of Technology 4259 Nagatsuda Midori-ku Yokohama 226-8503 Japan

An active stereo vision system based on a model of neural pathways of human binocular motor system is proposed. With this model, it is guaranteed that the two cameras of the active stereo vision system can keep their lines of sight fixed on the same target object during smooth pursuit. This feature is very important for active stereo vision systems, since not only 3D reconstruction needs the two cameras have an overlapping field of vision, but also it can facilitate the 3D reconstruction algorithm. To evaluate the effectiveness of the proposed method, some software simulations are done to demonstrate the same target tracking characteristic in a virtual environment apt to mistracking easily. Here, mistracking means two eyes track two different objects separately. Then the proposed method is implemented in our active stereo vision system to perform real tracking task in a laboratory scene where several persons walk self-determining. Before the proposed model is implemented in the system, mistracking occurred frequently. After it is enabled, mistracking never occurred. The result shows that the vision system based on neural pathways of human binocular motor system can reliably avoid mistracking.

关键词： binocular motor system neural pathway gaze mistracking

Quantification of driving factors on NDVI in oasis-desert ecotone using geographical detector method

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Journal of Mountain Science 2019年第11期16卷 2615-2624页

作者： zhang yu zhang Ke-cun AN Zhi-shan yu Yan-ping Key Laboratory of Desert and Desertification Northwest Institute of Eco-Environment and ResourcesCASLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

Within oasis-desert ecotone regions,the normalized difference vegetation index(NDVI)is an important parameter for evaluating the growth of *** accurate quantitative study between NDVI and environmental and anthropogenic factors is critical for understand the driving factors of vegetation growth in oasis-desert *** 2016,four periods Landsat 8 OLI_TIRS images,relevant climatological parameters data(air temperature,air relative humidity,wind velocity and accumulated temperature),land cover type data and soil data were selected as *** order to quantify the explanatory power for NDVI spatial and temporal distribution in the southern edge of Dunhuang City and northern side of the Mingsha Mountain,the geographical detector model was used to explain the potential influences of factors versus the spatial distribution of NDVI,and each explanatory variable's relative importance can be *** factor detector results disclose that the spatial distribution of NDVI is primarily dominated by land cover *** risk detector results show that,high NDVI region is located within *** mean value of NDVI displays an increase and then decrease trend with air temperature *** the increase of wind velocity and decrease of air relative humidity,the NDVI value shows a decrease *** interactive q values between the two factors are higher than any q value of separated *** also indicate that the strongest interactive effects of NDVI are different in distinct ***,anthropogenic activity is more important than environmental factors on NDVI in oasis-desert *** also demonstrate that air relative humidity rather than air temperature have played a greater role in NDVI spatial distribution.

关键词： Influence factors Normalized difference vegetation index Geographical detector Oasis-desert ecotone

Bimetallic NiCo2S4 Nanoneedles Anchored on Mesocarbon Microbeads as Advanced Electrodes for Asymmetric Supercapacitors

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Nano-Micro Letters 2019年第2期11卷 229-243页

作者： yu zhang Yihe zhang yuanxing zhang Haochen Si Li Sun Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral MaterialsSchool of Materials Science and TechnologyChina University of Geosciences

Bimetallic Ni–Co sulfides are outstanding pseudocapacitive materials with high electrochemical activity and excellent energy storage performance as electrodes for high-performance *** this study,a novel urchin-like NiCo2S4@mesocarbon microbead(NCS@MCMB) composite with a core–shell structure was prepared by a facile two-step hydrothermal *** highly conductive MCMBs offered abundant adsorption sites for the growth of NCS nanoneedles,which allowed each nanoneedle to fully unfold without aggregation,resulting in improved NCS utilization and efficient electron/ion transferin the *** applied as an electrode material for supercapacitors,the composite exhibited a maximum specific capacitance of 936 Fg-1 at 1 Ag-1 and a capacitance retention of 94% after 3000 cycles at 5 Ag-1,because of the synergistic effect of MCMB and ***,we fabricated an asymmetric supercapacitor based on the NCS@MCMB composite,which exhibited enlarged voltage windows and could power a light-emitting diode device for several minutes,further demonstrating the exceptional electrochemical performance of the NCS@MCMB composite.

关键词： Bimetallic sulfides NiCo2S4 Nanoneedles Mesocarbon microbeads Asymmetric supercapacitor

Amorphous red phosphorus anchored on carbon nanotubes as high performance electrodes for lithium ion batteries

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Nano Research 2018年第5期11卷 2733-2745页

作者： Li Sun yu zhang Deyang zhang Jingang Liu Yihe zhang Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Materials Science and Technology China University of Geosciences Beijing 100083 China

Red phosphorus-carbon nanotube （P@CNT） composites were synthesized as anodes for advanced lithium ion batteries via a facile solution-based method at room temperature. In these composites, the entangled P@CNT nanostructure reduced the aggregation of both components and allowed their complete utilization in a synergetic manner. The highly conductive and porous CNT framework, along with the nanoscale red P particles intimately anchored on the CNT surface, conferred the composite with excellent ion/electron transport properties. Volume expansion within the red P particles was mitigated by their amorphous and nanoscale features, which can be well buffered by the soft CNTs, therefore maintaining an integrated electrode structure during cycling. When used as an anode in lithium ion batteries, the composite exhibited a reversible capacity of 960 mAh·g^-1 （based on the overall weight of the composite） after 120 cycles at 200 mA·g^-1. The composite also delivered excellent high-rate capability with capacities of 886, 847, and 784 mAh·g^-1 at current densities of 2,000, 4,000, and 10,000 mA·g^-1 respectively, which reveals its potential as a high performance anode for lithium ion batteries.

关键词： red phosphorus carbon nanotubes anode lithium ion battery

Dual-atom catalysts:controllable synthesis and electrocatalytic applications

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Science China Chemistry 2021年第11期64卷 1908-1922页

作者： Shengbo zhang Yanfen Wu yu-Xiao zhang Zhiqiang Niu Department of Chemical Engineering Tsinghua UniversityBeijing100084China

Electrocatalysis,as the nexus for energy storage and environmental remediation,requires developing low-cost and highperforming heterogeneous *** with the single atom catalysts(SACs),dual-atom catalysts(DACs)are attracting ever-increasing interest due to their higher metal loading,more versatile active sites and unique ***,controlled synthesis of DACs remains a great challenge,and their electrocatalytic applications are still in *** review first discusses the synthesis of DACs by highlighting several synthetic ***,we exemplify the unique reactivities of DACs in electrocatalytic applications including water splitting,oxygen reduction,carbon dioxide reduction and nitrogen *** structure-activity relations of DACs are specifically discussed in comparison with that of SACs,on the basis of experimental and theoretical ***,the opportunities and challenges of DACs are summarized in terms of rational design,controlled synthesis,characterization,and applications.

关键词： dual-atom catalysts controlled synthesis electrocatalytic applications structure-activity relationship

A combination of chondroitinase ABC,glial cell line-derived neurotrophic factor,and Nogo A antibody delayed-release microspheres for the treatment of spinal cord injury

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Neural Regeneration Research 2011年第10期6卷 772-777页

作者： yu zhang yueming Song Department of Orthopedics West China Hospital Sichuan University Chengdu 610041 Sichuan Province China

The purpose of this study was to evaluate the effect of poly（lactide-co-glycolic acid） delayed-release microspheres,which were prepared using glial cell line-derived neurotrophic factor（GDNF）,on the delayed-release,controllability,and protection of GDNF *** present study is the first to combine chondroitinase ABC,GDNF,and Nogo A antibody delayed-release microspheres for the treatment of spinal cord *** show that the combined therapy of chondroitinase ABC,GDNF,and Nogo A antibody microspheres can increase the immunoreaction of neurofilament 200 in the injured spinal cord,and this therapeutic effect was better than chondroitinase ABC,GDNF,or Nogo A antibody microspheres administered singularly.

关键词： glial cell line-derived neurotrophic factor microspheres poly(lactide-co-glycolic acid) spinal cord injury neural regeneration

Quantization of a Class of Super W-Agebras

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Algebra Colloquium 2022年第4期29卷 633-642页

作者： yu zhang Xiaomin Tang School of Mathematical Science Heilongjiang University Harbin 150080China

We study a class of super W-algebras whose even part is the Virasoro type Lie algebra W(2,2).We quantize the Lie superbialgebra of the super W-algebra by the Drinfeld twist quantization technique and obtain a class of... 详细信息

关键词： quantization super W-algebra quantum group Lie superbialgebra

Comparison of growth and lipid accumulation properties of two oleaginous microalgae under different nutrient conditions

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Frontiers of Environmental Science & Engineering 2014年第5期8卷 703-709页

作者： Qiao zhang yu HONG College of Environmental Science and Engineering Beijing Forestry University Beijing 100083 China

This study compared the growth and lipid accumulation properties of two oleaginous microalgae, namely, Scenedesmus sp. LX1 and Chlorella sp. HQ, under different nutrient conditions. Both algal species obtained the highest biomass, lipid content and lipid yield under low-nutrient conditions （mBGll medium）. The biomass, lipid content and lipid yield of Scenedesmus sp. LX1 were 0.42g·L^-1, 22.5% and 93.8mg·L^-1, respectively. These values were relatively higher than those of Chlorella sp. HQ （0.30g·L^-1, 17.1% and 51.3mg·L^-1, respectively）. These algae were then cultivated in an SE medium that contained more nutrients; as a result, the biomass and lipid yield of Scenedesmus sp. LX1 reduced more significantly than those of Chlorella sp. HQ. Opposite results were observed in lipid and triacylglycerols （TAGs） contents. The cell sizes of both algal species under low-nutrient conditions were larger than those under high-nutrient conditions. Chlorella sp. HQ cells did not aggregate, but Scenedesmus sp. LX1 cells flocculated easily, particularly under low-nutrient conditions. In summary, low-nutrient conditions favour the growth and lipid production of both algae, but Scenedesmus sp. LX1 outperforms Chlorella sp. HQ.

关键词： Scenedesmus sp. LX1 Chlorella sp. HQ,growth rate algal biomass lipid accumulation triacylgly-cerols (TAGs)

Near-surface wind field characteristics of the desert-oasis transition zone in Dunhuang,China

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Journal of Arid Land 2024年第5期16卷 654-667页

作者： PAN Jiapeng zhang Kecun AN Zhishan zhang yu Key Laboratory of Desert and Desertification&Dunhuang Gobi and Desert Ecology and Environment Research Station Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

The desert-oasis transition zone(DOTZ)serves as a buffer area between the desert and *** its wind field characteristics is of great significance for the prevention and control of aeolian disasters in the *** this study,we used meteorological data during 2013–2019 from the portable meteorological stations at five sites(site A on the edge of the oasis,sites B,C,and D in the DOTZ,and site O in the desert)in Dunhuang,China to analyze the near-surface wind field characteristics and their causes,as well as to reveal the key role of the DOTZ in oasis *** results showed that the mean wind speed,frequency of sand-driving wind,and directional variability of wind decreased from west to east within the DOTZ,and wind speed was significantly affected by air *** terrain influenced the prevailing winds in the region,mainly from northeast and *** some areas adjacent to the oasis were controlled by southeasterly *** indicated that the near-surface wind field characteristics of the DOTZ were caused by the combined effects of local terrain and surface hydrothermal *** site D,the annual drift potential(DP)was 24.95 vector units(VU),indicating a low wind energy environment,and the resultant drift direction(RDD)showed obvious seasonal ***,the DOTZ played an important buffering role between the desert and *** with the desert,the mean wind speed in the oasis decreased by 64.98%,and the prevailing wind direction was more *** results of this study will be useful in interpreting the aeolian activity of the DOTZ in Dunhuang.

关键词： desert-oasis transition zone near-surface wind field hydrothermal difference sand-driving wind aeolian environment Dunhuang