检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

西藏部分县域牦牛球虫寄生现状调查

中兽医医药杂志 2024年第4期43卷 58-61页

作者：夏晨阳石斌裴晓双龙敏汤新明梁瑞英韦兰亭赤列旺姆德吉曲珍西藏自治区农牧科学院畜牧兽医研究所西藏拉萨850009 西藏农牧学院西藏林芝860000 中国农业科学院北京畜牧兽医研究所北京100193 那曲市农牧业(草业)科技研究推广中心西藏那曲852000

为了调查西藏部分地区牦牛球虫病感染率、寄生球虫种类特征,采用饱和食盐水漂浮法检查西藏日喀则市(萨嘎县、亚东县)、那曲市(嘉黎县、聂荣县)和阿里地区(改则县)245份牦牛粪便样本内球虫。研究结果显示,各调查县域牦牛球虫感染率较高,... 详细信息

为了调查西藏部分地区牦牛球虫病感染率、寄生球虫种类特征,采用饱和食盐水漂浮法检查西藏日喀则市(萨嘎县、亚东县)、那曲市(嘉黎县、聂荣县)和阿里地区(改则县)245份牦牛粪便样本内球虫。研究结果显示,各调查县域牦牛球虫感染率较高,平均感染率为71.43%,萨嘎县、亚东县、聂荣县、嘉黎县、改则县牦牛球虫感染率分别为82.61%(38/46)、80.25%(65/81)、68.97%(20/29)、68.18%(30/44)和48.89%(22/45);感染强度最高可达15000(OPG);牦牛球虫病呈现以混合感染为主的特点,阳性病例中混合感染率达100.00%,80.57%的患病牦牛同时寄生3种以上球虫;经鉴定,在样本中共发现6种球虫病病原,分别为邱氏艾美耳球虫(***)、牛艾美耳球虫(***)、怀俄明艾美耳球虫(***)、阿拉巴艾美耳球虫(***)、柱状艾美耳球虫(***)、拨克朗艾美耳球虫(***)。调查地区牦牛球虫感染率高,均呈现混合感染,且在调查区域内发现致病力很强的邱氏艾美耳球虫(***)、牛艾美耳球虫(***),其对当地牦牛的危害值得深入研究。

关键词：西藏牦牛球虫种类感染率调查

A Severe Seasonal Influenza Epidemic During 2017–2018 in China After the 2009 Pandemic Influenza: A Modeling Study

在线全文

学校读者我要写书评

暂无评论

Infectious Microbes & Diseases 2019年第1期1卷 20-26页

作者： Xiaofang Fu Yuqing Zhou Jie Wu Xiaoxiao Liu Cheng Ding chenyang Huang Min Deng Dongyan shi Chencheng Wang Kaijin Xu Jingjing Ren Bing Ruan Lanjuan Li shigui Yang State Key Laboratory for Diagnosis and Treatment of Infectious Diseases Collaborative Innovation Center for Diagnosis and Treatment of Infectious DiseasesThe First Affiliated HospitalCollege of MedicineZhejiang UniversityHangzhou 310003China

Influenza viruses continue to cause epidemics worldwide every ***,due to the lack of an effective assessment for the severity of influenza epidemics,it was extremely difficult to take preventative *** were extracted from infectious diseases reports from 2011–*** regression model and susceptible-exposed-infectious-recovered model were built to understand the characteristics and processes of the *** reported incidence of influenza was 1,913,698 from January 2011 to February 2018,with an average-yearly-reported-incidence-rate of 19.21 per 100,***,there had been a substantial nationwide epidemic of influenza after September 2017,when the average yearly reported incidence rate was 87.29 per 100,000 and an annual percentage change of 48.1%.The hemagglutinin genes of most influenza A(H1N1 and H3N2)viruses from the period of the epidemic had lower homology to those before August *** the hemagglutinin of the recommended A(H3N2,H1N1)and B(Victoria)viruses for vaccines 2017/2018 had low matches with the epidemic *** basic reproduction number was *** vaccination benefit was linearly related to vaccination coverage,while the quarantine measure had only significantly benefited when over 60%of the quarantined *** most severe epidemic of influenza in China since 2011 occurred during the period from September 2017 to February *** to quarantine,influenza vaccination is more effective way to prevent influenza,and strategies to increase vaccination coverage should be taken for the prevention of severe epidemics of influenza.

关键词： influenza severe epidemic overlapping epidemics incidence rate annual change percentage susceptible-exposedinfectious-recovered models

Research Aad Design of Drive Circuit for Vehicle Hub Motor Controller

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research Aad Design of Drive Circuit for Vehicle Hub Motor C...

2019中国汽车工程学会年会

作者： Xue Xuyang Hei Wenjie Sun chenyang Ye Yong Fan Qianwang shi Ling CRRC Yongji Electric Co. Ltd Tianhua College Shanghai Normal University

A pure electric vehicle is a vehicle that uses a battery as a driving energy source to drive a wheel by an electric *** hub motor is a drive system that integrates the motor,transmission and brakes into the wheels and can be used to drive pure electric *** one of the typical distributed power drive forms for vehicles,the permanent magnet synchronous hub motor and its controller have the characteristics of flexible driving form,simple structure,high efficiency,energy saving and high *** particular,in a harsh operating environment,the body of the four-wheel drive vehicle is more stable,the power output is more uniform,and the acceleration performance and stability of the body can be ***,the development of permanent magnet synchronous hub motors and their controllers has received extensive *** with the controller based on IGBT based permanent magnet synchronous hub,the permanent magnet synchronous hub motor controller with MOSFET design not only has the characteristics of thorough on/off,high operating frequency and low on-resistance,etc.,but also lower cost also contributes to the popularization of permanent magnet synchronous hub motors and their *** on a pure electric vehicle permanent magnet synchronous hub motor,a low-cost hardware solution is designed for the matching drive circuit of the motor *** program takes the IR chip driver IR2113 S as the core of the United States,and performs hardware analysis and design on the peripheral circuits such as boost isolation circuit,drive protection circuit,MOSFET ＆ absorption circuit,etc.,and provides a calculation method and design *** has certain theoretical and application reference significance for motor controller designers.

关键词： motor controller drive circuit IR2113S driving chip MOSFET

Research on PI Parameter Tuning Algorithm of Permanent Magnet Synchronous Motor Vector Controi System

在线全文

cnki会议

学校读者我要写书评

暂无评论

Research on PI Parameter Tuning Algorithm of Permanent Magne...

2019中国汽车工程学会年会

作者： Hei Wenjie Xue Xuyang Sun chenyang Ye Yong Fan Qianwang shi Ling CRRC Yongji Electric Co. Ltd. Tianhua College Shanghai Normal University

In the permanent magnet synchronous motor control system,how to quickly and efficiently adjust the parameters of multiple PI controllers in the vector control system according to the system parameters is of great significance to improve the system control *** this paper,MATLAB/Simulink is used to design the double closed loop vector control system of permanent magnet synchronous motor,and the parametertuning algorithm of PI controller used in current loop and speed loop is *** the research,the structure of the improved PI controller is analyzed firstly,and the conclusion that the model structure of the variable-speed integral PI controller has obvious superior characteristics is ***,using the frequency domain analysis method and the improved genetic algorithm,the PI parameters of the motor control system are quickly identified,and the parameter identification results are brought into the model of the permanent magnet synchronous motor vector control ***,through the analysis of the obtained simulation test curve,the feasibility and effectiveness of using the two methods involved for PI parameter identification are verified,and the effect of using improved genetic algorithm is ***,the improved genetic algorithm is applied to the traditional PI and the improved PI controller respectively,and the test results obtained by applying the two models are compared and *** final experimental results show that the parameter identification algorithm of PI controller based on improved genetic algorithm and improved PI controller is reliable and effective,and the obtained simulation curve is optimal.

关键词： PI parameter tuning algorithm PMSM simulink

The Study on Electric Vehicle Routing Problem with Customer's Time Windows and Charging Stations

在线全文

cnki会议

学校读者我要写书评

暂无评论

The Study on Electric Vehicle Routing Problem with Customer'...

2019中国汽车工程学会年会

作者： Sun chenyang Hei Wenjie Xue Xuyang Ye Yong Fan Qianwang shi Ling CRRC Yongji Electric Co. Ltd. Tianhua College Shanghai Normal University

Compared with traditional fuel vehicles,electric vehicles have the characteristics of short range and frequent charging,which brings difficulties in vehicle routing problem,such as increased delivery time and ***,this article will first add charging stations to the distribution network to build electric vehicle routing planning and charging policy model with time windows and multiple distribution centers,considering the vehicle cost,transportation cost,power supply cost and time windows penalty *** then designed a improved particle swarm optimization algorithm to search *** used the classical data of Solomon to test and analyze algorithm which is designed in this paper,we can give yield satisfactory electric car vehicle routing planning scheme.

关键词： electric vehicles vehicle route planning particle swarm optimization charging stations time window

拖航工况下半潜式平台横撑波浪砰击特性试验研究

在线全文

cnki会议

学校读者我要写书评

暂无评论

中国造船 2021年第3期62卷 40-53页

作者：施奇朱晨阳魏长栋霍发力安康江苏科技大学船舶与海洋工程学院镇江212003

半潜式平台在拖航过程中会不断承受着波浪砰击,同时在船级社规范中明确规定结构强度在分析时波浪砰击不可忽略。拖航工况下影响平台横撑结构波浪砰击载荷因素较多,非线性更为突出,目前的数值分析方法很难非常精确地模拟平台拖航工况下... 详细信息

半潜式平台在拖航过程中会不断承受着波浪砰击,同时在船级社规范中明确规定结构强度在分析时波浪砰击不可忽略。拖航工况下影响平台横撑结构波浪砰击载荷因素较多,非线性更为突出,目前的数值分析方法很难非常精确地模拟平台拖航工况下的砰击载荷特性。论文通过模型试验方法研究了半潜式平台在拖航状态下不同位置处、不同拖航速度、不同波高和波陡工况下的砰击压力特性,得到半潜式平台受到的波浪砰击压力规律,为半潜式平台设计提供理论支撑。

关键词：波浪砰击半潜式平台拖航模型试验

Synergistic Catalytic Effect of LaMnO3-CNTs in Oxygen Reduction Reaction

在线全文

学校读者我要写书评

暂无评论

Synergistic Catalytic Effect of LaMnO3-CNTs in Oxygen Reduct...

2021中国汽车工程学会年会暨展览会

作者： Chen Yunzhi Mu Yangchang Liu Fude Peng chenyang Xie Tianfeng Zheng Dawei shi Zhicong Yang Yibin School of Materials and Energy Guangdong University of Technology

The application of perovskite oxides with ABO structure to oxygen reduction reaction(ORR) catalysts(ORRCs) has received increasing *** of the studies have focused on changing the A or B metal ions in the ***,the best catalyst carrier of ABO remains ***,in the present work,LaMnO-CNTs,LaMnO-graphene,LaMnO-graphene oxide,and LaMnO-acetylene black were synthesized from a LaMnO precursor and various catalyst carriers with different *** results revealed that LaMnO-CNTs,which are binary catalysts that act as LaMnO carriers and an electrochemically active ingredient,exert a considerable synergistic catalytic effect.A maximum power density of 265.8 mW cm was realized for the aluminum-air batteries using LaMnO-CNTs as ORRCs.

关键词： perovskite LaMnO3 CNTs Oxygen reduction reaction synergistic catalytic effect

基于E-LVC技术的重大综合灾害耦合情景推演方法

在线全文

cnki会议

学校读者我要写书评

暂无评论

清华大学学报（自然科学版） 2021年第6期61卷 487-493页

作者：邓青施成浩王辰阳陈彬高扬张辉清华大学工程物理系公共安全研究院城市综合应急科学北京市重点实验室北京100084 国防科技大学智能科学学院长沙410073 国防科技大学系统工程学院长沙410073 中国人民警察大学智慧警务学院廊坊065000

面向大规模耦合灾害,提出了一种基于增强的真实操作、虚拟模拟、构造模拟(E-LVC)技术的重大综合灾害耦合情景推演方法,并研发了基于E-LVC的灾害救援机器人、大型实验装置、仿真和数据系统的动态交互技术。在耦合灾害场景下,救援机器人... 详细信息

面向大规模耦合灾害,提出了一种基于增强的真实操作、虚拟模拟、构造模拟(E-LVC)技术的重大综合灾害耦合情景推演方法,并研发了基于E-LVC的灾害救援机器人、大型实验装置、仿真和数据系统的动态交互技术。在耦合灾害场景下,救援机器人进入灾害现场,实时高效探索灾情现场环境并获取前线现场数据,基于E-LVC的动态交互技术实时地将灾情信息回传至控制台,构建环境地图和灾情现场情景,并显示在虚实结合的决策支持平台上,为"人在回路"的重大灾害情景推演和应急演练奠定基础。假定灾害耦合场景为北京发生大地震导致火灾并耦合风场作用,以人员疏散和城市大规模交通疏散为应急演练内容进行了案例研究,验证了所提出的情景推演方法的辅助决策能力。

关键词：增强的真实操作、虚拟模拟、构造模拟(E-LVC)技术灾害耦合救援机器人情景推演

基于聚合混合模态分解和时序卷积神经网络的综合能源系统负荷修正预测

在线全文

学校读者我要写书评

暂无评论

电网技术 2022年第9期46卷 3345-3353页

作者：李文武张鹏宇石强冯晨洋李丹三峡大学电气与新能源学院湖北省宜昌市443002 梯级水电站运行与控制湖北省重点实验室(三峡大学) 湖北省宜昌市443002 广东电网有限责任公司广州黄埔供电局广东省广州市510700

为增强综合能源系统负荷精细化分解水平,充分利用误差信息以进一步提升预测性能,提出一种基于聚合混合模态分解和时序卷积神经网络(temporal convolutional network,TCN)的综合能源系统负荷修正预测框架。首先,采用改进完全集合经验模... 详细信息

为增强综合能源系统负荷精细化分解水平,充分利用误差信息以进一步提升预测性能,提出一种基于聚合混合模态分解和时序卷积神经网络(temporal convolutional network,TCN)的综合能源系统负荷修正预测框架。首先,采用改进完全集合经验模态分解对电、冷和热负荷初步分解处理,随后利用变分模态分解对具有强复杂性的子序列进一步分解。然后,依据最大信息系数(maximum information coefficient,MIC)分析多元负荷的耦合特性并通过多元相空间重构(multivariate phase space reconstruction,MPSR)丰富特征信息。最后,构建基于TCN的修正预测模型。以校园综合能源系统算例对比不同预测模型,结果显示所提修正预测框架的电、冷和热负荷预测均具有较低的平均绝对百分比误差,有效解决了预测中模态分解的模态混叠以及模态高频分量问题,实现预测误差修正。

关键词：综合能源系统负荷预测混合模态分解最大信息系数时序卷积神经网络误差修正