检索结果-南通市图书馆

Observer-based backstepping longitudinal control for carrier-based UAV with actuator faults

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2017年第2期28卷 322-337页

作者： fengying zheng Ziyang Zhen Huajun Gong College of Astronautics Nanjing University of Aeronautics and Astronautics Nanjing 210016 China College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

The paper presents the longitudinal control for the carrier-based unmanned aerial vehicle (UAV) system with unmeasured states, actuator faults, control input constraints, and external disturbances. By combining output state observer, adaptive fuzzy control, and constraint backstepping technology, a robust fault tolerant control approach is proposed. An output state observer with fuzzy logic systems is developed to estimate unmeasured states, and command filters rather than differentiations of virtual control law are used to solve the computational complexity problem in traditional backstepping. Additionally, a robust term is introduced to offset the fuzzy adaptive estimation error and external disturbance, and an appropriate fault controller structure with matching conditions obtained from fault compensation is proposed. Based on the Lyapunov theory, the designed control program is illustrated to guarantee that all the closed-loop signals of the given system are bounded, and the output errors converge to a small neighborhood of zero. A carrier-based UAV nonlinear longitudinal model is employed to testify the feasibility and validity of the control scheme. The simulation results show that all the controllers can perform at a satisfactory level of reference tracking despite the existence of unknown aerodynamic parameters and actuator faults. © 2017 Beijing Institute of Aerospace Information.

关键词： Actuators Aircraft control Backstepping Control system analysis Control theory Controllers Error compensation Fault tolerance Flight control systems Fuzzy control Fuzzy filters Fuzzy logic State estimation Three term control systems Unmanned aerial vehicles (UAV)

在线全文

学校读者我要写书评

暂无评论

尿液中锌的比色智能检测

分析科学学报 2024年第2期40卷 165-171页

作者：张子缓刘凤娇郑凤英骆嘉燚黄昭景梁洁玲郑静茵黄倩燕李顺兴闽南师范大学化学化工与环境学院福建漳州363000 福建省现代分离分析科学与技术重点实验室福建漳州363000

设计制备了对锌有特异性响应、负载显色剂Zincon的比色检测试纸。在滴入p H9.0的硼酸盐缓冲溶液后试纸呈红色,Zincon和试样中锌络合后,试纸颜色由红色转变为蓝色,以试纸颜色R通道值绘制标准曲线,可定量测定尿液中锌含量。建立以聚丙烯腈... 详细信息

设计制备了对锌有特异性响应、负载显色剂Zincon的比色检测试纸。在滴入p H9.0的硼酸盐缓冲溶液后试纸呈红色,Zincon和试样中锌络合后,试纸颜色由红色转变为蓝色,以试纸颜色R通道值绘制标准曲线,可定量测定尿液中锌含量。建立以聚丙烯腈(PAN)、聚乙烯吡咯烷酮(PVP)为载体的显色剂保护机制,以静电纺丝法保证比色传感器制备重现性。基于机器学习模型-深度卷积神经网络(Deepconvolutional neuralnetworks,DCNN)算法解决显色试纸光谱干扰问题,此算法具有较好预测精准度,搭载到智能手机APP,构成集“快速采样、数据处理和传输、实时、可视化检测”于一体的尿锌全分析系统。方法检测限低至0.1mg/L,可用于疾病的无创预诊,具有成本低、检测快、易操作、精度好与准确率高的优点。

关键词：尿锌机器学习比色检测疾病预防

Nitrogen-doped carbon@TiO_(2) double-shelled hollow spheres as an electrochemical sensor for simultaneous determination of dopamine and paracetamol in human serum and saliva

在线全文

学校读者我要写书评

暂无评论

Journal of Pharmaceutical Analysis 2022年第3期12卷 436-445页

作者： Hui Yang Gongxun Cao Yongjun Huang Ye Lin fengying zheng Luxiu Lin Fengjiao Liu Shunxing Li College of Chemistry Chemical Engineering and EnvironmentMinnan Normal UniversityZhangzhouFujian363000China Fujian Provincial Key Laboratory of Pollution Monitoring and Control Minnan Normal UniversityZhangzhouFujian363000China Fujian Key Laboratory of Separation and Analysis Science and Technology ZhangzhouFujian363000China

As the most commonly used antipyretic and analgesic drug,paracetamol(PA)coexists with neurotransmitter dopamine(DA)in real biological *** simultaneous determination is extremely important for human health,but they also interfere with each *** order to improve the conductivity,adsorption affinity,sensitivity,and selectivity of TiO_(2)-based electrochemical sensor,N-doped carbon@-TiO_(2) double-shelled hollow sphere(HeC/N@TiO_(2))is designed and synthesized by simple alcoholic and hydrothermal method,using polystyrene sphere(PS)as a ***,TiO_(2) hollow spheres(H eTiO_(2))or N-doped carbon hollow spheres(HeC/N)are also prepared by the same ***/N@TiO_(2) has good conductivity,charge separation,and the highly enhanced and stable current responses for the detection of PA and *** detection limit and linear range are 50.0 nmol/L and 0.3-50 mmol/L for PA,40.0 nmol/L and 0.3e50 mmol/L for DA,respectively,which are better than those of carbon-based ***,this electrochemical sensor,with high selectivity,strong anti-interference,high reliability,and long time durability,can be used for the simultaneous detection of PA and DA in human blood serum and *** high electrochemical performance of HeC/N@TiO_(2) is attributed to the multifunctional combination of different layers,because of good conductivity,absorption and electrons transfer ability from in-situ N-doped carbon and electrocatalytic activity from TiO_(2).

关键词： Electrochemical sensor Simultaneous determination Paracetamol Dopamine

New Mode in Parasites Experimental Teaching --Application and Experience of Interactive Teaching with Digital Microscope System

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International English Education Research 2014年第9期 73-75页

作者： zheng fengying Teaching and Research Section of Medical Laboratory Science of Medical School Binzhou Polytechnic Binzhou 256600

In order to improve the parasites experimental teaching quality, Digital Microscope System is used to replace the ordinary optical microscope in the teaching of eggs, imagoes, and tissue slices. The new model of experimental teaching, integrating modem information technology into the parasite experimental teaching, gives full play to the students＇ learning enthusiasm, initiative and creativity and improves the quality of experimental teaching. And at the same time, it provides a basis for the microbiological and pathological experimental teaching reform.

关键词： Digital Microscope interaction experimental teaching experience

An SEIHR model with age group and social contact for analysis of Fuzhou COVID-19 large wave

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Infectious Disease Modelling 2024年第3期9卷 728-743页

作者： Xiaomin Lan Guangmin Chen Ruiyang Zhou Kuicheng zheng Shaojian Cai fengying Wei Zhen Jin Xuerong Mao School of Mathematics and Statistics Fuzhou UniversityFuzhou350116FujianChina Fujian Provincial Center for Disease Control and Prevention Fuzhou350012FujianChina Center for Applied Mathematics of Fujian Province Fuzhou350116FujianChina Key Laboratory of Operations Research and Control of Universities in Fujian Fuzhou UniversityFuzhou350116FujianChina Complex Models Research Center Shanxi UniversityTaiyuan030006ShanxiChina Department of Mathematics and Statistics University of StrathclydeGlasgowG11XHUK

The main epidemiological features such as basic reproduction number,effective reproduction number and sensitivity analysis were extensively discussed for multi-age groups SEIHR model in this ***,by using of the next generation matrix method,basic reproduction number R0 of the total population was estimated as 1.57 using parameter values of four age groups of Fuzhou COVID-19 large *** age group k,the values of R_(0k)(age group k to age group k),the values of R_(o)^(k)(an infected of age group k to the total population)and the values of R_(o)^(k)>R_(0k)>R_(o)^(k)(an infected of the total population to age group k)were also estimated,in which the explorations of the impacts of age groups revealed that the relationship was ***,the fluctuating tendencies of effective reproduction number Rt were demonstrated by using two approaches(the surveillance data and the SEIHR model)for Fuzhou COVID-19 large wave,during which high-risk group(G4 group)mainly contributed the infection scale due to high susceptibility to infection and high risks to basic ***,the sensitivity analysis using two approaches(the sensitivity index and the PRCC values)revealed that susceptibility to infection of age groups played the vital roles,while the numerical simulation showed that infection scale varied with the changes of social contacts of age *** results of this study claimed that the high-risk group out of the total population was concerned by the local government with the highest susceptibility to infection against *** This study verified that the partition structure of age groups of the total population,the susceptibility to infection of age groups,the social contacts among age groups were the important contributors of infection *** less social contacts and adequate hospital beds for high-risk group were profitable to control the spread of *** avoid the emergence of medical runs against new variant in the future,the polic

关键词： COVID-19 model Age group Omicron BA.5.2 variant Contact matrixSocial contact

Study on Pseudolite System for BeiDou Based on Dynamic and Independent Aircrafts Configuration

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Study on Pseudolite System for BeiDou Based on Dynamic and I...

第四届中国卫星导航学术年会

作者： Guohua Kang Longyu Tan Bing Hua fengying zheng Academy of Frontier Science NanJing University of Aeronautics and Astronautics College of Automation Engineering NanJing University of Aeronautics and Astronautics

This paper presents a pseudolite system for BeiDou based on dynamic and independent aircrafts configuration. Firstly, high-altitude and long-endurance unmanned aerial vehicles and airships are needed to obtain the best configuration by analyzing GDOP. Then aiming at the pseudolites’ positioning, a new integrated scheme was proposed, where distance between two aircrafts is utilized to improve the positioning accuracy. Simulation results show that GDOP is less than 3.5 and position precision of the pseudolite is 1.2m in the users’ area .The pseudolite system is able to provide moderate navigation service, when BeiDou position system is unavailable to users.

关键词： pseudolite BeiDou position system dynamic configuration integrated position

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

基于坐标系动态变化的无人机着舰引导算法

中南大学学报（自然科学版） 2016年第8期47卷 2685-2693页

作者：郑峰婴龚华军甄子洋南京航空航天大学航天学院江苏南京210016 南京航空航天大学自动化学院江苏南京210016

针对无人机着舰区域动态变化,难以精确预估的问题,设计一种基于新坐标体系动态变化的自动着舰引导算法。在捕获阶段,新坐标系随无人机空间位置的变化而动态变化;在跟踪阶段,新坐标系随回收着舰区域的变化而动态变化,计算无人机在新坐标... 详细信息

针对无人机着舰区域动态变化,难以精确预估的问题,设计一种基于新坐标体系动态变化的自动着舰引导算法。在捕获阶段,新坐标系随无人机空间位置的变化而动态变化;在跟踪阶段,新坐标系随回收着舰区域的变化而动态变化,计算无人机在新坐标系下的速度和位置误差,经轨迹控制器修正误差,实现无人机的精确引导。以现役某型舰载无人机为对象,搭建综合仿真平台,设计飞行控制系统,优化轨迹控制器参数,加入舰尾流和导航误差,完成引导性能的验证与评估。研究结果表明:该自动着舰系统能引导无人机实现较精确地撞网着舰回收,着舰性能符合要求。

关键词：无人机自动着舰引导算法飞行控制轨迹引导

Dynamic evolution of an SVEIR model with variants and non-pharmaceutical interventions for controlling COVID-19

在线全文

学校读者我要写书评

暂无评论

Journal of Biosafety and Biosecurity 2024年第2期6卷 67-75页

作者： Ruiyang Zhou Shaojian Cai Guangmin Chen Senzhong Huang Zhen Jin Zhihang Peng Weichuan Lin fengying Wei Kuicheng zheng School of Mathematics and Statistics Fuzhou UniversityFuzhou 350116FujianChina Fujian Provincial Center for Disease Control and Prevention Fuzhou 350012FujianChina School of Statistics and Data Science ZhiYing Research Center for Health DataNankai UniversityTianjin 300071China Complex Systems Research Center Shanxi UniversityTaiyuan 030006ShanxiChina Department of Biostatistics School of Public HealthNanjing Medical UniversityNanjing 211166JiangsuChina School of Mathematics and Statistics Fujian Normal UniversityFuzhou 350007FujianChina Center for Applied Mathematics of Fujian Province Fuzhou UniversityFuzhou 350116FujianChina Key Laboratory of Operations Research and Control of Universities in Fujian Fuzhou UniversityFuzhou 350116FujianChina Fujian Provincial Key Laboratory of Zoonosis Research Fuzhou 350001FujianChina Teaching Base of the School of Public Health of Fujian Medical University Fuzhou 350001FujianChina

The epidemiological characteristics and distributions of two epidemics in Fujian Province of Southeast China were attributed to the complex interactions among variant,host,and non-pharmaceutical interventions(NPIs).All reported cases in the Putian epidemic(September 8–October 2,2021,Delta variant B.1.617.2)and Fuzhou epidemic(October 22–November 18,2022,Omicron variant BA.5.2)were classified by sex,age group,occupation,and location in this *** surveillance data from the Fujian Provincial Center for Disease Control and Prevention,we established a virus-oriented SVEIR(Susceptible–Vaccinated–Exposed–Infected–Recovered)model to investigate the dynamic evolution features of these two variants and the effects of *** optimal simulations were carried out with variants and scenario *** scenario investigations showed that NPIs significantly reduced the transmission risk and infection scales of COVID-19,and that the Omicron variant was more infectious than the Delta ***,the dynamic investigations revealed the increasing tendencies from Delta to Omicron,such as the basic reproduction number,infection rate,percentage of high-risk cases,and the growth *** tendencies were also identified,such as the average recovery period,the awareness delay,and the percentage of symptomatic *** study highlighted that NPIs played critical roles in successfully containing the two *** interventions are strongly recommended to public health policymakers.

关键词： COVID-19 SVEIR model Transmission dynamics Non-pharmaceutical interventions Delta variant Omicron variant

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

温度对双岛湾鳗草种子萌发的影响

种子 2019年第10期38卷 57-61页

作者：张飞郑凤英山东大学(威海)海洋学院

对采自双岛湾的鳗草(Zostera marina L.)种子,分别进行了野外盆栽种子萌发试验及室内5℃低温保存时长(30d、60d和90d)和萌发温度(5℃、15℃和25℃)对种子萌发的影响实验。结果表明:鳗草种子在野外经过了夏季高温期和冬季低温期的休眠后... 详细信息

对采自双岛湾的鳗草(Zostera marina L.)种子,分别进行了野外盆栽种子萌发试验及室内5℃低温保存时长(30d、60d和90d)和萌发温度(5℃、15℃和25℃)对种子萌发的影响实验。结果表明:鳗草种子在野外经过了夏季高温期和冬季低温期的休眠后于次年2月末水温为4℃时开始萌发,持续至5月,萌发期水温为4~17℃,累积萌发率随春季回暖显著提高,在4—5月达到峰值,5月底累积萌发率达20.6%,实生苗于4—5月快速生长发育,对应水温为6~17℃;5℃低温保存不同时长和不同萌发温度对种子的萌发率的影响都极显著,即低温保存时间越长,种子萌发率越高,且显著缩短了种子的初始萌发时间和萌发高峰时间,保存90d后3个萌发温度下的初始萌发时间均小于3d、萌发高峰时间均小于8d。不同低温保存时长条件下,均以15℃为最适萌发温度。

关键词：鳗草种子萌发温度双岛湾