检索结果-南通市图书馆

基于双增益方法的不确定非线性系统的输出反馈调节问题

在线全文

学校读者我要写书评

暂无评论

控制与决策 2024年第4期39卷 1260-1266页

作者：殷县龙孙宗耀谭庆全陈智强孟庆华曲阜师范大学自动化研究所山东曲阜273165 北京市地震局北京100080 成功大学系统及船舶机电工程学系中国台湾台南70101 杭州电子科技大学机械工程学院杭州310018

研究一类具有多种不确定性的非线性系统的全局输出反馈调节问题.所研究系统的一个显著特点是非线性项被未知增长率和多项式形式的输出函数的乘积界定,难点是在输出受不确定参数摄动的情况下如何抑制非线性项.提出一种改进的双增益方法... 详细信息

研究一类具有多种不确定性的非线性系统的全局输出反馈调节问题.所研究系统的一个显著特点是非线性项被未知增长率和多项式形式的输出函数的乘积界定,难点是在输出受不确定参数摄动的情况下如何抑制非线性项.提出一种改进的双增益方法来设计输出反馈控制器,可以确保闭环系统所有信号全局一致有界并且原系统状态收敛到零.最后,采用质量弹簧机械系统的输出反馈镇定问题来说明控制策略的有效性.

关键词：输出反馈调节未知增长率输出不确定性双增益方法全局镇定非线性系统

Reaction Kinetics of Ozonation of Trichloroethylene and Benzene in Gas and Liquid Phases

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2000年第3期8卷 272-275页

作者：钟理 Kuo chiang-Hai Department of Chemical Engineering Mississippi State University MS 39762USA

The kinetics of ozonation reactions of trichloroethylene (TCE) and benzene in gas and liquid phases at 101.3 kPa and 298 K was investigated in this paper. The ozonation of TCE is first order with respect to the ozone concentration and one and half order to TCE in the gas phase with the average rate constant 57.30 (mol·L-1)-1.5·s-1, and the TCE ozonation in aqueous medium is first order with respect to both ozone and trichloroethylene with the average rate constant 6.30 (mol·L-1)-1·-1. The ozonation of benzene in the gas phase is first order in ozone but independent of the benzene concentration with the average reaction rate constant 0.0011s-1. The overall kinetics of reaction between ozone and benzene in aqueous solution is found to be first order with one-half order in both ozone and bezene, with the average reaction rate constant 2.67s-1. It is found that the ozonation rate of pallutants is much quicker than that of self-decomposition of ozone in both gas and aqueous phase.

关键词： reaction ozone pollutant trichloroethylene benzene

Rolling route for refining grains of super light Mg-Li alloys containing Sc and Be

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2010年第8期20卷 1374-1379页

作者： chiang Chih-Te LEE Shyong Department of Mechanical Engineering National Central University

Pioneering work on Sc or/and Be added Mg-Li alloys with refined grains was initiated. Various rolling-based thermo-mechanical treatments on these Mg-Li alloys were carried out. Four Mg-Li alloys were prepared by vacuum melting process. A unique route for producing fine grains was applied which concluded solution treatment at 350 ℃, cold rolling with 60% thickness reduction and 250 ℃ annealing, successively.

关键词： Mg-Li alloy beryllium scandium solid solution strengthening

基于YOLOv5和Mask-RCNN组合模型的社交媒体内涝灾害分析

在线全文

学校读者我要写书评

暂无评论

浙江大学学报（工学版） 2024年第9期58卷 1822-1831页

作者：张凌嘉周欣磊许月萍江衍铭浙江大学建筑工程学院浙江杭州310058

由于缺少淹没实测数据,针对城市市区淹没深度测量数据需求,基于社交媒体与深度学习技术,探索根据社交媒体用户上传信息提取洪水淹没信息的新方法.研发基于YOLOv5与Mask-RCNN组合模型的实例分割算法,制作轿车众多关键部位的识别数据集.... 详细信息

由于缺少淹没实测数据,针对城市市区淹没深度测量数据需求,基于社交媒体与深度学习技术,探索根据社交媒体用户上传信息提取洪水淹没信息的新方法.研发基于YOLOv5与Mask-RCNN组合模型的实例分割算法,制作轿车众多关键部位的识别数据集.根据模型训练结果实现全新的市区淹没事件的淹没高度提取方法.通过输入淹没图像对城市内涝中淹没点位与淹没深度进行预测,与淹没重演模型得到的数据进行比较.基于模拟淹没实验来制作验证数据集,验证该方法的可行性.结果表明,所研发的YOLOv5与Mask-RCNN组合模型的纳什效率系数为0.98.使用郑州市“7·20”城市内涝的实际社交媒体图像进行可靠性验证.结果表明,所提方法能够为城市市区内涝淹没过程提供有效数据来源.

关键词：城市内涝社交媒体 YOLOv5 Mask-RCNN 水深提取图像识别

Altered heart rate variability and pulse-wave velocity after spinal cord injury

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2022年第27期10卷 9680-9692页

作者： Hsi-Kai Tsou Kuan-Chung Shih yueh-chiang Lin Yi-Ming Li Hsiao-yu Chen Functional Neurosurgery Division Neurological InstituteTaichung Veterans General HospitalTaichung 404Taiwan Department of Rehabilitation Jen-Teh Junior College of MedicineNursing and ManagementMiaoli County 356Taiwan College of Health National Taichung University of Science and TechnologyTaichung 403Taiwan College of Medicine National Chung Hsing UniversityTaichung 402Taiwan Research Assistant The Rong Sing Medical FoundationTaichung 404Taiwan Research Assistant Neurological InstituteTaichung Veterans General HospitalTaichung 404Taiwan Research Assistant Department of NursingNational Taichung University of Science and TechnologyTaichung 403Taiwan Graduate Institute of Applied Science and Technology National Taiwan University of Science and TechnologyTaipei 106Taiwan Department of Nursing National Taichung University of Science and TechnologyTaichung 403Taiwan

BACKGROUND Heart rate variability(HRV) and pulse-wave velocity(PWV),indicators of cardiac function,are altered in patients with spinal cord injury(SCI),suggesting that autonomic cardiac function and arterial stiffness may underlie the high risk of cardiovascular complications in these *** study has simultaneously investigated HRV and PWV in the same *** To evaluate cardiovascular complications in SCI patients by comparing HRV and PWV between patients with and without *** In this cross-sectional pilot study,patients with(n = 60) and without SCI(n = 60) were recruited from December 7,2019 to January 21,*** participant received a five-minute assessment of HRV and the cardiovascular system using the Medicore HRV Analyzer SA-3000 *** in HRV and PWV parameters between participants with and without SCI were statistically *** We observed a significant difference between participants with and without SCI with respect to the standard deviation of all normal-to-normal intervals,square root of the mean sum of squared successive risk ratio interval differences,physical stress index,total power,very-low frequency,low frequency,high frequency,and arterial *** Patients with SCI have weaker sympathetic and parasympathetic activity as well as lower arterial elasticity compared to those without,suggesting that SCI may increase cardiac function loading.

关键词： Acceleration plethysmography Cardiac function Heart rate variability Pulse wave velocity Spinal cord injury

Anthropomorphic Design of the Human-Like Walking Robot

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2013年第2期10卷 186-193页

作者： Ming-Hsun chiang Fan-Ren Chang Department of Electric Engineering National Taiwan University Taipei City Taiwan 10617

In this paper, we present a new concept of the mechanical design of a humanoid robot. The goal is to build a humanoid robot utilizing a new structure which is more suitable for human-like walking with the characteristics of the knee stretch, heel-contact, and toe-off. Inspired by human skeleton, we made an anthropomorphic pelvis for the humanoid robot. In comparison with con- ventional humanoid robots, with such the anthropomorphic pelvis, our robot is capable of adjusting the center of gravity of the upper body by the motion of pelvic tilt, thus reducing the required torque at the ankle joint and the velocity variations in hu- man-like walking. With more precise analysis of the foot mechanism, the fixed-length inverted pendulum can be used to describe the dynamics of biped walking, thus preventing redundant works and power consumption in length variable inverted pendulum system. As the result of the new structure we propose, a humanoid robot is able to walk with human-like gait.

关键词： humanoid robot anthropomorphic robot mechanical design human-like walking heel-contact motion toe-off motion

Benefit of prophylactic bronchodilator withβ2 adrenergic agonist in ischemia-reperfusion-induced lung injury

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

BIOCELL 2021年第5期45卷 1201-1211页

作者： CHEN-LIANG TSAI yu-HUEI LIN CHIH-YING CHANGCHIEN CHIH-FENG CHIAN CHI-HUEI chiang Division of Pulmonary and Critical Care Department of Internal MedicineTri-Service General HospitalNational Defense Medical CenterTaipei114Taiwan Post-Baccalaureate Program in Nursing College of NursingTaipei Medical UniversityTaipei110Taiwan Department of General Medicine Tri-Service General HospitalNational Defense Medical CenterTaipei114Taiwan Division of Pulmonary Immunology and Infectious Diseases Chest DepartmentTaipei Veterans General HospitalTaipei112Taiwan

Primary lung graft dysfunction could significantly attribute to ischemia-reperfusion lung injury(IRLI)during transplantation surgery.β2-adrenergic agonists were one of the bronchodilators that had been well-established in the management of asthma and chronic obstructive pulmonary disease(COPD)with anti-inflammatory *** applying the model of isolated rat lung,we evaluated the efficacy of short-actingβ2-agonist inhalation to ameliorate ischemia-reperfusion *** experiment protocol was 180 min of global ischemia and then reperfusion for 60 *** theβ2-agonist inhalation group,aerosolized albuterol was administrated prior ischemia *** weight ratios of wet to dry lung and microvascular permeability were characterized in the IRLI *** contrast,pre-inhaledβ2-agonist significantly mitigated the severity of pulmonary *** lavage from theβ2-agonist group presented decreased leukocyte counts and cytokines production,including interleukin-1β(IL-1β),tumor necrosis factor-α(TNF-α),and macrophage inflammatory protein 2(MIP-2).Devastating oxidative stress was widely recognized during the ischemia-reperfusion process,whileβ2-agonist pretreatment revealed subsided H2O2,myeloperoxidase(MPO),and the cleavage of *** blotting from lung homogenates identified the blockade of NF-κB and MAPK activation in theβ2-agonist inhalation ***,there was no specific pharmacotherapy in IRLI *** results elucidated the protective effect ofβ2-agonist bronchodilator against ischemia-reperfusion induced oxidative stress,inflammation reaction,and pulmonary edema.

关键词： Ischemia-reperfusion lung injury β2-adrenergic agonist Bronchodilator Lung transplantation

创新与突破:《义务教育信息科技课程标准(2022年版)》的变化特色分析与启示

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

开放学习研究 2024年第2期29卷 43-49页

作者：尚晓晶江丰光河南师范大学教育学部河南新乡453007 上海交通大学教育学院上海200240

信息科技的发展不断推动着教育变革,《义务教育信息科技课程标准(2022年版)》首次确立了信息科技课程在义务教育阶段的独立性地位,对我国中小学信息科技教育发展具有划时代意义。本研究在梳理了义务教育阶段信息科技教育的发展历程后,... 详细信息

信息科技的发展不断推动着教育变革,《义务教育信息科技课程标准(2022年版)》首次确立了信息科技课程在义务教育阶段的独立性地位,对我国中小学信息科技教育发展具有划时代意义。本研究在梳理了义务教育阶段信息科技教育的发展历程后,从课程理念、课程目标与内容等方面对新旧课标进行对比分析,进一步明晰了新课标的亮点和突破点。针对分析结果对课程实施提出强化信息科技知、情、意、行相融合的课程取向,深化学生信息科技素养的课程培养目标,灵活设计具有体验性、真实性的跨学科主题内容,从整体性与连续性方面把握学段课程内容衔接等建议,以期为相关研究人员和一线教师提供参考借鉴。

关键词：课程标准信息技术信息科技核心素养

Efficient expression of histidine-tagged large hepatitis delta antigen in baculovirus-transduced baby hamster kidney cells

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2006年第10期12卷 1551-1557页

作者： Ying-Wei chiang Jaw-Chin Wu Kuei-Chun Wang Chia-Wei Lai Yao-Chi Chung yu-Chen Hu Department of Chemical Engineering National Tsing Hua University Hsinchu 300 Taiwan China Institute of Clinical Medicine National Yang Ming University and Division of Gastroenterology Department of Medicine Taipei Veterans General Hospital Taipei 112 Taiwan China

AIM： To study the baculovirus/mammalian cell system for efficient expression of functional large hepatitis delta antigen （L-HDAg）. METHODS： A recombinant baculovirus expressing histidine-tagged L-HDAg （L-HDAgH） was constructed to transduce baby hamster kidney （BHK） cells by a simplified transduction protocol. RESULTS： The recombinant baculovirus transduced BHK cells with efficiencies higher than 90% as determined by flow cytometry. The expression level was significantly higher than that obtained by plasmid transfection and was further enhanced 3-fold to around 19 pg/cell by the addition of 10 mmol/L sodium butyrate. Importantly, the expressed L-HDAgH was localized to the cell nucleus and correctly isoprenylated as determined by immunofluorescence labeling and confocal microscopy. Moreover, L-HDAgH interacted with hepatitis B surface antigen to form virus-like particles. CONCLUSION： The fusion with histidine tags as well as overexpression of L-HDAgH in the baculovirus-transduced BHK cells does not impair the biological functions. Taken together, the baculovirus/mammalian cell system offers an attractive alternative for high level expression of L-HDAgH or other proteins that require extensive posttranslational modifications.

关键词： Baculovirus Hepatitis delta virus L-HDAg Mammalian cell Protein expression Transduction