检索结果-南通市图书馆

Research on Driver’s Fatigue Detection Based on Information Fusion

Computers, Materials & Continua 2024年第4期79卷 1039-1061页

作者： Meiyan Zhang Boqi Zhao Jipu Li Qisong Wang Dan Liu jinwei sun Jingxiao Liao Harbin Institute of Technology School of Instrument Science and EngineeringHarbin150036China Department of Industrial and Systems Engineering The Hong Kong Polytechnic UniversityHong Kong100872China

Driving fatigue is a physiological phenomenon that often occurs during *** the driver enters a fatigued state,the attentionis lax,the response is slow,and the ability todeal with emergencies is significantly reduced,which can easily cause traffic ***,studying driver fatigue detectionmethods is significant in ensuring safe ***,the fatigue state of actual drivers is easily interfered with by the external environment(glasses and light),which leads to many problems,such as weak reliability of fatigue driving ***,fatigue is a slow process,first manifested in physiological signals and then reflected in human face *** improve the accuracy and stability of fatigue detection,this paper proposed a driver fatigue detection method based on image information and physiological information,designed a fatigue driving detection device,built a simulation driving experiment platform,and collected facial as well as physiological information of drivers during ***,the effectiveness of the fatigue detection method was *** movement feature parameters and physiological signal features of drivers’fatigue levels were *** driver fatigue detection model was trained to classify fatigue and non-fatigue states based on the extracted *** rates of the image,electroencephalogram(EEG),and blood oxygen signals were 86%,82%,and 71%,*** fusion theory was presented to facilitate the fatigue detection effect;the fatigue features were fused using multiple kernel learning and typical correlation analysis methods to increase the detection accuracy to 94%.It can be seen that the fatigue driving detectionmethod based onmulti-source feature fusion effectively detected driver fatigue state,and the accuracy rate was higher than that of a single information *** summary,fatigue drivingmonitoring has broad development prospects and can be used in traffic accident prevention and wearable dr

关键词： Driving fatigue information fusion EEG blood oxygen

来源：

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

Trace Pd alloyed with Au to boost Au/uncalcined TS-1 catalyzed propane hydro-oxidation to acetone

引用

Nano Research 2024年第8期17卷 7182-7193页

作者： jinwei sun Zhihua Zhang Erchuan Yang Wei Du Fan Liu Kesheng Xu Yuxia Zhong Xuezhi Duan Xinggui Zhou State Key Laboratory of Chemical Engineering School of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China

Selective oxidation of propane to acetone(AC)with H_(2) and O_(2) provides a direct route to convert low-cost propane into valueadded ***,the catalytic activity of conventional Au/Ti-based catalysts is constrained by the high energy barrier for H_(2) ***,uncalcined TS-1 supported Au-Pd bimetallic catalysts were prepared,and the relationship between the active-site structure and corresponding performance in the selective oxidation of propane with H_(2) and O_(2) in the gas phase was systematically *** contrast to the liquid-phase reaction,trace Pd alloyed with Au triggered an increase in both catalytic activity and selectivity,in which Au_(20)-Pd_(1)/TS-1-B catalyst exhibited excellent activity(170 gAC·h^(−1)·kgcat^(−1))and AC selectivity(90.6%),much higher than those of the Au/TS-1-B catalyst(AC formation rate of 100 gAC·h^(−1)·kgcat^(−1)and AC selectivity of 86.3%).It was found that Pd was gradually isolated into monomers with the increase of Au/Pd molar ratio,and the synergy between Pd single atoms and Au improved the catalytic performance via enhancing hydrogen dissociation and modulating the electronic structure of ***,the reaction conditions were optimized based on the kinetics studies and the Au_(20)-Pd_(1)/TS-1-B catalyst exhibited enhanced H_(2) selectivity(45%)and long-term stability(over 130 h).The insights gained here can offer valuable guidance for the design of Au-Pd catalysts applicable to other gas-phase oxidation reactions.

关键词： propane selective oxidation acetone hydrogen dissociation Au-Pd alloy synergy

来源：

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

C源与NP添加对Cd胁迫下林地土壤呼吸作用的影响

引用

南京林业大学学报（自然科学版） 2024年第1期48卷 140-146页

作者：孙劲伟王圣燕范弟武朱咏莉南京林业大学生态与环境学院江苏南京210037 南京林业大学南方现代林业协同创新中心江苏南京210037 江苏洪泽湖湿地生态系统国家定位观测研究站江苏洪泽223100

【目的】研究C源与矿质营养氮磷(NP)添加对土壤呼吸作用毒物兴奋效应(Hormesis)的影响。【方法】以模式土壤为对象,接种杨树林地土壤微生物,设置单独添加葡萄糖(GC)、单独添加矿质营养NP(NP)、同时添加葡萄糖和NP(GC+NP),以及二者均无... 详细信息

【目的】研究C源与矿质营养氮磷(NP)添加对土壤呼吸作用毒物兴奋效应(Hormesis)的影响。【方法】以模式土壤为对象,接种杨树林地土壤微生物,设置单独添加葡萄糖(GC)、单独添加矿质营养NP(NP)、同时添加葡萄糖和NP(GC+NP),以及二者均无添加的对照(CK)4个处理,研究Cd胁迫下土壤呼吸作用潜在的Hormesis效应。【结果】(1)NP和GC+NP处理,林地土壤呼吸速率在Cd剂量为0.02、0.10、0.40、2.50、13.00 mg/kg时均显著高于对照,且表现出显著的多重Hormesis效应交替出现的现象,刺激幅度变化在66.6%~262.6%。(2)土壤中不添加Cd时,GC与NP处理土壤呼吸速率之和大于GC+NP处理,土壤呼吸对二者的添加表现为拮抗效应;当Cd剂量在0.01~0.20 mg/kg区间时,GC与NP处理土壤呼吸速率之和小于GC+NP处理,C源与NP添加对土壤呼吸的影响表现为协同效应;Cd剂量>0.20 mg/kg时,二者之间表现为协同与拮抗效应的交替出现。【结论】外源添加N、P条件下,Cd诱导林地土壤呼吸表现出显著的Hormesis效应。当面临逐渐增加的Cd胁迫时,C源与NP添加对土壤呼吸的交互作用表现为由拮抗向协同效应转变。

关键词：土壤呼吸 Cd胁迫毒物兴奋效应模式土壤葡萄糖氮磷添加

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Estimation of Nonlinear Roll Damping by Analytical Approximation of Experimental Free-Decay Amplitudes

引用

Journal of Ocean University of China 2019年第4期18卷 812-822页

作者： sun jinwei SHAO Meng College of Engineering Ocean University of China Qingdao 266100 China Key Laboratory of Ocean Engineering of Shandong Province Ocean University of China Qingdao 266100 China Institute of Oceanographic Instrumentation Qilu University of Technology (Shandong Academy of Sciences) Qingdao 266001 China Shandong Provincial Key Laboratory of Ocean Environmental Monitoring Technology Qingdao 266001 China National Engineering and Technological Research Center of Marine Monitoring Equipment Qingdao 266001 China

Damping is critical for the roll motion response of a ship in waves. A common method for the assessment of damping in a ship’s rolling motion is to perform a free-decay experiment in calm water. In this paper, we propose an approach for estimating nonlinear damping that involves a linear exponential analytical approximation of the experimental roll free-decay amplitudes, fol- lowed by parametric identification based on the asymptotic method. The restoring moment can be strongly nonlinear. To validate this method, we first analyzed numerically simulated roll free-decay data using rolling equations with two alternative parametric forms: linear-plus-quadratic and linear-plus-cubic damping. By doing so, we obtained accurate estimates of nonlinear damping coefficients, even for large initial roll amplitudes. Then, we applied the proposed method to real free-decay data obtained from a scale model of a bulk barrier, and found the simulated results to be in good agreement with the experimental data. Using only free-decay peak data, the proposed method can be used to estimate nonlinear roll-damping coefficients for conditions with a strongly nonlinear restoring moment and large initial roll amplitudes.

关键词： nonlinear roll damping parametric identification nonlinear restoring moment asymptotic method linear exponential approximation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

文明交流互鉴:国际中文教育硕士研究生培养的根本遵循

引用

安阳师范学院学报 2024年第4期26卷 120-124页

作者：孙金伟孙朝阳安阳师范学院马克思主义学院河南安阳455000

文明交流互鉴重要论述不仅是打造人类命运共同体的重要途径,推动人类文明共同进步和世界和平发展的重要动力,也为国际中文教育学科专业建设提供了理论基础,有效解决了学界对国际中文教育学科专业性质的争论。构建人类命运共同体、文明... 详细信息

文明交流互鉴重要论述不仅是打造人类命运共同体的重要途径,推动人类文明共同进步和世界和平发展的重要动力,也为国际中文教育学科专业建设提供了理论基础,有效解决了学界对国际中文教育学科专业性质的争论。构建人类命运共同体、文明交流互鉴和国际中文教育三者之间构成了推动中华文化走向世界的完整体系,构建人类命运共同体是文明交流互鉴和国际中文教育的终极目标和根本任务,文明交流互鉴和国际中文教育是构建人类命运共同体的观念保障和实现路径,文明交流互鉴是国际中文教育的根本遵循,国际中文教育是促进中外文明交流互鉴的重要支撑。因此,国际中文教育应将文明交流互鉴重要论述作为专业建设的根本遵循、课程设置的指导思想,并将之列为重要的专业课程或专业课程的重要内容。

关键词：文明交流互鉴国际中文教育研究生培养

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

集装箱式医疗建筑验收技术要点

引用

建筑施工 2024年第1期46卷 125-128页

作者：孙锦伟王卓韩旭上海建工五建集团有限公司上海200063

通过分析火神山等典型集装箱式应急医疗建筑的验收方式、不同医疗分区的特点以及国内主要的验收相关标准,总结了适合集装箱式医疗建筑的高效验收经验。针对其工程特点,将重点验收专项划分为材料、土建、机电安装、密封性及气流组织、污... 详细信息

通过分析火神山等典型集装箱式应急医疗建筑的验收方式、不同医疗分区的特点以及国内主要的验收相关标准,总结了适合集装箱式医疗建筑的高效验收经验。针对其工程特点,将重点验收专项划分为材料、土建、机电安装、密封性及气流组织、污水处理、其他医疗相关、保温节能、信息化系统工程验收,总结了验收技术要点,简化了验收与交付流程,为类似工程验收提供了参考。

关键词：集装箱医疗建筑应急验收要点

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Estimating Daily Dew Point Temperature Based on Local and Cross-StationMeteorological Data Using CatBoost Algorithm

引用

Computer Modeling in Engineering & Sciences 2022年第2期130卷 671-700页

作者： Fuqi Yao jinwei sun Jianhua Dong School of Hydraulic Engineering Ludong UniversityYantai264010China State Key Laboratory ofWater Resources and Hydropower Engineering Science Wuhan UniversityWuhan430072China

Accurate estimation of dew point temperature(Tdew)plays a very important role in the fields of water resource management,agricultural engineering,climatology and energy ***,there are few studies on the applicability of local Tdew algorithms at regional *** study evaluated the performance of a new machine learning algorithm,i.e.,gradient boosting on decision trees with categorical features support(Cat Boost)to estimate daily Tdew using limited local and cross-station meteorological *** random forests(RF)algorithm was also assessed for *** meteorological data from 2016 to 2019,including maximum,minimum and average temperature(Tmax,Tmin and Tmean),maximum,minimum and average relative humidity(RHmax,RHmin and RHmean),maximum,minimum and average global solar radiation(Rsmax,Rsmin and Rsmean)from three weather stations in Hunan of China were used to evaluate the CatBoost and RF *** results showed that both algorithms achieved satisfactory estimation accuracy at the target stations(on average RMSE=1.020℃,R^(2)=0.969,MAE=0.718℃and NRMSE=0.087)in the absence of complete meteorological parameters(with only temperature data as input).The Cat Boost algorithm(on average RMSE=1.900℃and R^(2)=0.835)was better than the RF algorithm(on average RMSE=2.214℃andR^(2)=0.828).The accuracy and stability of the CatBoost and RF algorithms were positively correlated with the number of input parameters,and the three-parameter algorithms achieved higher estimation accuracy than the two-parameter *** developed methodology is helpful to predict Tdew at regional scale.

关键词： Dew point temperature categorical boosting random forests cross-station accuracy

来源：

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

纳滤与闪蒸技术对新鲜牛乳浓缩效果的影响

引用

中国乳品工业 2024年第9期52卷 75-80页

作者：骆冬莹孙蕾孙金威梁文星王苏宁赵广生杭州新希望双峰有限公司杭州311103 新希望乳业股份有限公司成都610000

文章以新鲜牛乳为研究对象,通过测定牛乳的感官、色差、酸度、冰点、粒径等特性,及其蛋白、脂肪、乳糖、金属离子、过氧化物酶含量,研究纳滤和闪蒸技术对浓缩鲜牛乳的影响。结果表明,经截留分子质量为1 ku和0.2 ku的纳滤浓缩新鲜牛乳1.3... 详细信息

文章以新鲜牛乳为研究对象,通过测定牛乳的感官、色差、酸度、冰点、粒径等特性,及其蛋白、脂肪、乳糖、金属离子、过氧化物酶含量,研究纳滤和闪蒸技术对浓缩鲜牛乳的影响。结果表明,经截留分子质量为1 ku和0.2 ku的纳滤浓缩新鲜牛乳1.35倍时,纳滤膜的膜通量降幅较小,浓缩效率约降低了14.0%和12.0%;经闪蒸技术处理(5 kPa,65℃)后,鲜牛乳色泽和滋味的感官评分较原奶分别下降2.3%和22.6%,且L*值和b*值下降幅度最大为2.8%和2.7%,而纳滤对鲜牛乳感官、L*值和b*值无显著影响(P>0.05)。不同孔径的纳滤膜浓缩新鲜牛乳1.35倍时,其酸度较鲜牛乳分别上升10.1%、9.7%;经膜过滤后,鲜牛乳中蛋白、钙离子截留率分别为98%~100%和97%~99%。结果表明,经纳滤膜技术处理后的新鲜牛乳酸度略有升高,感官和营养物质含量几乎不受影响。

关键词：纳滤闪蒸鲜牛乳理化性质

来源：

维普期刊数据库

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of nitrogen levels on photosynthetic parameters,morphological and chemical characters of saplings and trees in a temperate forest

引用

Journal of Forestry Research 2018年第6期29卷 1481-1488页

作者： jinwei sun Fuqi Yao Jiabing Wu Pingcang Zhang Wensheng Xu Changjiang River Scientific Research Institute Wuhan 430010People’s Republic of China State Key Laboratory of Forest and Soil Ecology Institute of Applied EcologyChinese Academy of SciencesShenyang 110016People’s Republic of China

Exploring the response differences of leaf physiology parameters to enhanced nitrogen deposition between saplings and trees is vital for predicting the variations of terrestrial ecosystem structure and function under future global climate change. In this study, the ecophysiological parameters of saplings and trees of Fraxinus mandshurica Rupr. were measured at different levels of nitrogen addition in a temperate forest. The results show that ecophysiological parameters maximum net photosynthetic rate(Pmax), apparent quantum efficiency(a), dark respiration(Rd), light saturation point(Lsp), photosynthetic nitrogen use efficiency(PNUE),specific leaf area(SLA)and stomatal conductance under saturated light intensity(Gsmax) were higher in saplings than in trees. These physiological parameters and not Nleaf(leaf nitrogen content)led to relatively lower Pmaxand Rdin trees. For both saplings and trees, low and median nitrogen addition(23 and 46 kg ha-1a-1) resulted in significant increases in Pmax, Rd, Lsp, Chl, PNUE, SLA and Gsmax. These parameters tended to decline under high additions of nitrogen(69 kg ha-1a-1),whereas Nleaf was always enhanced with increasing nitrogen. Variations in Pmax and Rd with increasing nitrogen were attributed to variations in the strongly related parameters of, Lsp, Chl, PNUE, SLA and Gsmax. Overall, the response sensitivity of physiological parameters to enhanced nitrogen levels was lower in trees compared with saplings.

关键词： Physiology parameters Added nitrogen Saplings Trees Deciduous broadleaved species

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

扭曲旋转混凝土艺术建筑一体化建造技术研究

引用

建筑施工 2024年第6期46卷 899-902页

作者：孙锦伟施智亮王孙骏上海建工五建集团有限公司上海200063

依托上海西岸华鑫金融中心建设项目工程,分析项目旋转扭曲异形结构的特点和难点,研究总结扭曲旋转混凝土艺术建筑一体化建造技术,并取得了以下成果:聚焦异形旋转扭曲建筑的测量定位难题,提出了以多专业三维测量体系为核心的一体化建造方... 详细信息

依托上海西岸华鑫金融中心建设项目工程,分析项目旋转扭曲异形结构的特点和难点,研究总结扭曲旋转混凝土艺术建筑一体化建造技术,并取得了以下成果:聚焦异形旋转扭曲建筑的测量定位难题,提出了以多专业三维测量体系为核心的一体化建造方法,确保了“细柱薄梁”复杂建筑体型的实现;为解决大量非标异形结构的制作施工难题,以模块化和标准化建造为思路,创新研发了小截面焊接装备、三段式一体化模板等技术,保证了施工质量和节省了建造费用;建立了传递复杂测量数据的B+平台,完成了以BIM技术为基础的跨专业深化设计,优化了钢筋梁柱节点、幕墙埋件等内容,有效提升了项目一体化施工水平。

关键词：三维扭曲测量钢结构幕墙埋件 BIM

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：