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The Study on the Gas Sensitivity of the One-Dimensional ZnO

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稀有金属材料与工程 2006年第A3期35卷 170-172页

作者： Qun Xiang Rongli Liu Liyi Shi Zhiyin Ni qingyi pan Department of Chemistry Shanghai University Shanghai 200444 China

One-dimensional (1D) ZnO was prepared through hydrothermal synthesis by cetyltrimethylammonium bromide (CTAB) controling its *** products were characterized by X-ray diffraction (XRD),transmission electron microscopy (TEM) and scanning electron microscopy (SEM).The sintered gas sensor was prepared using ZnO nanorods and its gas sensitivity was measured in static gas *** result showed that the ZnO nanorods had lower working temperature than granulated ZnO and had very good sensitivity to 10μg/g trimethylamine (TMA),methanol,ammonia, acetone and ethanol at the working temperature of 170℃.SEM picture revealed that there were many multi-pores in the surface of the *** multi-pores might help to absorb gases and improve the gas sensitivity.

关键词： gas sensitivity one-dimensional Zn hydrothermal synthesis

Preparation and Gas Sensitive Properties of Nanometer-Sized SnO_(2)

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Advances in Manufacturing 1998年第1期 75-79页

作者： pan qingyi Dong Xiaowen Xu Jiaqiang Zhang Jianping Shi Liyi School of Chemicstry and Chemical Engineering Shanghai University Zhengzhou Institute of Light Industry

Nanometer sized SnO 2 particles were prepared by a sol gel method using inorganic salt as a precursor material. Its crystallization was investigated by means of TG DTA,IR absorption spectra, X ray diffractometry and TEM as well as its resistivity change and the gas sensitivity varied with temperature were measured in various reducing gas. The results indicate that well crystallized nano sized SnO 2 with size around 15nm can be obtained at annealing temperature 600℃. The activation energy for the growth of nano SnO 2 was calculated to be *** 1 when the annealing temperature was higher than 500℃. The measurements also show that there is a peculiar resistance change varied with temperature for nano SnO *** has relevance to the increase in surface adsorbed oxygen. The selective detectivities to C 4H 10 and petrol can be increased when ruthenium ion was doped in nano SnO 2 as a catalyst and so do the gas sensitivity to CO,CH 4,H 2 etc. when rhodium ion was doped *** detection to the several reducing gas can be realized when the temperature ranged from 260℃ to 400℃.

关键词： sol gel nanometer sized tin oxide gas sensitive property

A module based modeling framework for estimating lunar dust deposition due to human activities

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Chinese Journal of Aeronautics 2024年第2期37卷 501-510页

作者： Chunjian pan College of Automation Engineering Shanghai University of Electric PowerShanghai 200090China

Lunar dust is considered to be one of the top challenges for enabling humans to have extended stays on the *** activities such as module landings and launches,walking,rover operation and construction activities will inevitably produce a significant amount of ***,it is important to estimate the potential range and intensity of dust deposition caused by these activities to minimize dust accumulation over time and for maintenance planning and execution.A modular model that correlates the dust deposition distribution with initial mean dust particle velocity,its mean ejected angle and the total amount of ejected mass is developed for an elementary mechanical *** modular model is further employed to form a modeling framework to estimate dust deposition of a trajectory based activity of similar repeated movements such as the landing process of a lander,walking and rover *** model forms a unified modeling framework for different trajectory-based activities and is shown to predict consistent and physically meaningful ranges and intensities of dust deposition provided reliable data to calibrate the model parameters.

关键词： Lunar dust Dust deposition Lunar lander Lunar construction Model calibration

Analytical Solutions for an Isotropic Elastic Half-Plane with Complete Surface Effects Subjected to a Concentrated/Uniform Surface Load

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Acta Mechanica Solida Sinica 2024年第3期37卷 371-384页

作者： Xia-Hui pan School of Civil Engineering Henan Polytechnic UniversityJiaozuo454003China

Within the context of Gurtin-Murdoch surface elasticity theory,closed-form analytical solutions are derived for an isotropic elastic half-plane subjected to a concentrated/uniform surface *** the effects of residual surface stress and surface elasticity are *** stress function method and Fourier integral transform technique are *** solutions are provided in a compact manner that can easily reduce to special situations that take into account either one surface effect or none at *** results indicate that surface effects generally lower the stress levels and smooth the deformation profiles in the *** elasticity plays a dominant role in the in-plane elastic fields for a tangentially loaded half-plane,while the effect of residual surface stress is fundamentally crucial for the out-of-plane stress and displacement when the half-plane is normally *** the remaining situations,combined effects of surface elasticity and residual surface stress should be *** results for a concentrated surface force serve essentially as fundamental solutions of the Flamant and the half-plane Cerruti problems with surface *** solutions presented in this work may be helpful for understanding the contact behaviors between solids at the nanoscale.

关键词： Surface effects Residual surface stress Surface elasticity Half-plane Analytical solutions

水热合成工艺对Zn_2SnO_4纳米晶形貌及电化学性能的影响(英文)

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硅酸盐学报 2007年第8期35卷 978-981页

作者：徐甲强张海林潘庆谊向群李超上海大学理学院化学系上海200444 郑州轻工业学院材料和化学工程系郑州450002

采用水热法合成了新型锂离子电池阳极材料Zn2SnO4纳米晶。研究了水热时间对材料结构、形貌及电化学性能的影响。通过X射线衍射、透射电镜和电化学法表征了产物的结构和形貌,并测试了材料的电化学特性。结果表明:水热时间将影响产物的形... 详细信息

采用水热法合成了新型锂离子电池阳极材料Zn2SnO4纳米晶。研究了水热时间对材料结构、形貌及电化学性能的影响。通过X射线衍射、透射电镜和电化学法表征了产物的结构和形貌,并测试了材料的电化学特性。结果表明:水热时间将影响产物的形貌、尺寸和结晶度,从而影响其电化学性能。220 ℃水热处理 28h后,所获得的Zn2SnO4具有较小的颗粒尺寸和较高的结晶度,其初始放电比容量,在 100mA/g 恒电流密度和0～1.4V电压范围内,达 591.9 (mA.h)/g;同样温度处理24h 后获得的Zn2SnO4其初始放电容量为502.7mA.h/g,充放电14次后仍有409.5 (mA.h)/g。220 ℃水热处理获得的Zn2SnO4具有锂离子电池阳极材料应用所需的优异的电化学特性。

关键词：水热过程锡酸锌阳极材料电化学性能

Preparation and Gas Sensitive Properties of Nanometer-Sized SnO2

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Advances in Manufacturing 1998年第1期 75-79页

作者： pan qingyi Dong Xiaowen Xu Jiaqiang * Zhang Jianping Shi Liyi (School of Chemicstry and Chemical Engineering, Shanghai University) ( *Zhengzhou Institute of Light Industry)

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关键词： sol gel nanometer sized tin oxide gas sensitive property

Aeroengine thrust estimation and embedded verification based on improved temporal convolutional network

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Chinese Journal of Aeronautics 2024年第1期37卷 106-117页

作者： Wanzhi MENG Zhuorui pan Sixin WEN pan QIN Ximing SUN Key Laboratory of Intelligent Control and Optimization for Industrial Equipment of Ministry of Education Dalian University of TechnologyDalian 116024China School of Control Science and Engineering Dalian University of TechnologyDalian 116024China

Thrust estimation is a significant part of aeroengine thrust control *** traditional estimation methods are either low in accuracy or large in *** further improve the estimation effect,a thrust estimator based on Multi-layer Residual Temporal Convolutional Network(M-RTCN)is *** solve the problem of dead Rectified Linear Unit(ReLU),the proposed method uses the Gaussian Error Linear Unit(GELU)activation function instead of ReLU in residual *** the overall architecture of the multi-layer convolutional network is adjusted by using residual connections,so that the network thrust estimation effect and memory consumption are further ***,the comparison with seven other methods shows that the proposed method has the advantages of higher estimation accuracy and faster convergence ***,six neural network models are deployed in the embedded controller of the micro-turbojet *** Hardware-in-the-Loop(HIL)testing results demonstrate the superiority of M-RTCN in terms of estimation accuracy,memory occupation and running ***,an ignition verification is conducted to confirm the expected thrust estimation and real-time performance.

关键词： Thrust estimation Temporal convolutional network Embedded deployment Hardware-in-the-loop testing Ignition verification

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基于多层次架构的继电保护在线状态评价方法

无线互联科技 2017年第16期14卷 16-17页

作者：潘青艺国网福建电力有限公司泉州供电公司福建泉州362000

新时期,人们的生产和生活都离不开电力能源,电力企业充斥着人类社会的各个角落,改变着人们以往的工作和生活方式,给人们带来了极大的便利。众所周知,电是一种清洁可再生能源,在人们生活中发挥着不可替代的作用,但在电力能源生产、输送... 详细信息

新时期,人们的生产和生活都离不开电力能源,电力企业充斥着人类社会的各个角落,改变着人们以往的工作和生活方式,给人们带来了极大的便利。众所周知,电是一种清洁可再生能源,在人们生活中发挥着不可替代的作用,但在电力能源生产、输送及使用过程中,一旦操作不当将会产生无法预计的危害。文章研究了基于多层次架构的继电保护在线状态评价方法,保证电力系统的稳定运行,以期推动电力企业持续健康发展。

关键词：继电保护在线状态评价运行故障

Shape optimisation of basin insulator for DC gas insulated switchgear/gas insulated transmission lines based on artificial bee colony algorithm

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High Voltage 2024年第2期9卷 275-286页

作者： Yi Luo Shiyi Mao Ju Tang Zijun pan Cheng pan State Key Laboratory of Power Grid Environmental Protection School of Electrical Engineering and AutomationWuhan UniversityWuhanChina

The surface charge accumulation on the basin insulator is a particular problem in high-voltage direct current(HVDC)gas insulated switchgears(GIS)and gas insulated trans-mission lines(GIL),which restricts the development and application of extra/ultra high-voltage(EHV/UHV)*** surface charge distribution and anti-flashover performance are closely related to the insulator *** obtain the optimal basin insulator,a shape optimisation model based on artificial bee colony algorithm was established,and the minimisation objective functions based on capacitive(initial)electric field distribution and resistive(steady-state)electric field distribution were respectively *** optimisation results of the two objective functions were calculated,and the electric field and charge distribution on the surface of the insulator before and after optimisation were evaluated and compared using the simulation *** results indicated that the optimisation based on the capacitive electric field can significantly inhibit the surface charge accumulation,and the optimised insulator can significantly reduce the surface normal electric field and make the distribution of the tangential electric field more uniform,and the maximum tangential electric field can be reduced by 10%;the optimisation based on resistive electric field can achieve similar results,but requires more computational *** on the results,the‘anti-charge’basin insulator structure suitable for the DC field was given.

关键词： insulator artificial charge