检索结果-南通市图书馆

Towards an ultrafast 3D imaging scanning LiDAR system: a review

Photonics Research 2024年第8期12卷 1709-1729页

作者： ZHI LI yaqi han LICAN WU ZIhan ZANG MAOLIN DAI SZE YUN SET SHINJI YAMASHITA QIAN LI H.Y.FU Tsinghua Shenzhen International Graduate School Tsinghua University Department of Electrical Engineering and Information Systems The University of Tokyo Research Center for Advanced Science and Technology The University of Tokyo School of Electronic and Computer Engineering Peking University

Light detection and ranging (LiDAR), as a hot imaging technology in both industry and academia, has undergone rapid innovation and evolution. The current mainstream direction is towards system miniaturization and integration. There are many metrics that can be used to evaluate the performance of a LiDAR system, such as lateral resolution, ranging accuracy, stability, size, and price. Until recently, with the continuous enrichment of LiDAR application scenarios, the pursuit of imaging speed has attracted tremendous research interest. Particularly, for autonomous vehicles running on motorways or industrial automation applications, the imaging speed of LiDAR systems is a critical bottleneck. In this review, we will focus on discussing the upper speed limit of the LiDAR system. Based on the working mechanism, the limitation of optical parts on the maximum imaging speed is analyzed. The beam scanner has the greatest impact on imaging speed. We provide the working principle of current popular beam scanners used in LiDAR systems and summarize the main constraints on the scanning speed. Especially, we highlight the spectral scanning LiDAR as a new paradigm of ultrafast ***, to further improve the imaging speed, we then review the parallel detection methods, which include multiple-detector schemes and multiplexing technologies. Furthermore, we summarize the LiDAR systems with the fastest point acquisition rate reported nowadays. In the outlook, we address the current technical challenges for ultrafast LiDAR systems from different aspects and give a brief analysis of the feasibility of different approaches.

关键词： Frequency combs High speed imaging Optical access networks Remote sensing Single pixel imaging Spatial light modulators

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

单元整体视角下小学英语复习指导探析

引用

英语教师 2024年第14期24卷 186-188,192页

作者：韩雅琦甘肃省天水市武山县洛门镇第二小学甘肃天水741300

阐述单元整体视角下的小学英语复习指导的价值。分析小学英语复习指导存在的问题,即主题不够突出,系统性和逻辑性不足;复习过程机械化,内容浅层化;情境创设脱离现实生活,学生主动性不足。结合教学实例,探索单元整体视角下的小学英语复... 详细信息

阐述单元整体视角下的小学英语复习指导的价值。分析小学英语复习指导存在的问题,即主题不够突出,系统性和逻辑性不足;复习过程机械化,内容浅层化;情境创设脱离现实生活,学生主动性不足。结合教学实例,探索单元整体视角下的小学英语复习指导策略,即搭建单元复习逻辑主线,凸显单元复习主题;精确定位复习切入点,狠抓单元复习重难点;结合教材文本内容,创设单元复习情境;深研单元话题内容,扩展英语复习层次。

关键词：小学英语单元整体复习指导

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

东北林业地区体育特色小镇资源开发研究

引用

当代体育科技 2024年第7期14卷 79-82,99页

作者：富馨娆孙一韩雅琪吉林大学体育学院吉林长春130015

东北林业地区自然资源丰富,多年以来以林业经济为主,产业发展相对单一。随着国家大力推动东北振兴,东北林业地区的经济发展也面临着产业升级和转型,应逐步由单一产业转向多产业,尤其是旅游服务业急需转型。该文将以东北林业地区体育特... 详细信息

东北林业地区自然资源丰富,多年以来以林业经济为主,产业发展相对单一。随着国家大力推动东北振兴,东北林业地区的经济发展也面临着产业升级和转型,应逐步由单一产业转向多产业,尤其是旅游服务业急需转型。该文将以东北林业地区体育特色小镇的资源开发为研究重点,运用文献资料法、实地调查法、访谈法、数理统计法等对东北体育特色小镇的研究目的、现状分析、研究对象等展开论述,并结合具体事例,对制约当地发展的因素提出相应的解决对策,以小见大,为国家“体育产业+特色旅游”的小镇建设提供参考,促进东北林业地区体育旅游产业的发展。

关键词：体育特色小镇湾龙镇存在问题解决措施

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

康复运动对老年急性心肌梗死患者心率减速力及连续心率减速力的影响及临床价值研究

引用

中国循证心血管医学杂志 2024年第3期16卷 300-303页

作者：闫菲吴蕊韩雅琪王文涛林松华中阜外医院河南省人民医院心脏中心郑州大学华中阜外医院心肺功能科郑州450008

目的探讨康复运动对老年急性心肌梗死患者心率减速力(DC)和连续心率减速力(DRs)的影响及临床价值。方法选择2021年1月1日至2022年1月1日于华中阜外医院就诊的老年AMI患者62例,剔除失访者2例,最终纳入60例,年龄60~75岁,所有入选患者均行... 详细信息

目的探讨康复运动对老年急性心肌梗死患者心率减速力(DC)和连续心率减速力(DRs)的影响及临床价值。方法选择2021年1月1日至2022年1月1日于华中阜外医院就诊的老年AMI患者62例,剔除失访者2例,最终纳入60例,年龄60~75岁,所有入选患者均行经皮冠状动脉介入治疗(PCI),且术后无严重并发症,采用数字表法随机分为对照组和研究组,每组各30例,两组均按常规采用“药物+PCI”治疗方案,研究组在此基础上由专业的心脏康复医师评定后,给予为期6个月的康复运动治疗,分别于康复治疗前后行24 h动态心电图检查。比较康复运动前后两组患者DC、DRs及心率变异性(HRV)指标的变化,同时观察各组不良心血管事件(MACE)的发生率。结果康复运动前两组24h R-R间期标准差(SDNN)、24h R-R间期平均值的标准差(SDANN)、24h R-R间期差的均方根(RMSSD)、DC、DRs指标比较,差异均无统计学意义(P>0.05),康复运动后研究组SDNN、RMSSD、DC、DR2、DR4值均明显高于对照组,差异有统计学意义(P<0.05)。将两组患者DR8值治疗前后的差值进行比较,研究组DR8差值高于对照组,差异有统计学意义(P<0.05)。随访期间两组均无MACE事件发生。结论心脏康复运动能显著提高老年AMI患者PCI术后DC与DRs值,改善其自主神经功能,相对安全有效,值得临床推广。

关键词：急性心肌梗死心率减速力心率变异性

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

Analyzing the Influence of Aggregate Properties on Stopping Distance on Truck Escape Ramps

引用

Journal of Shanghai Jiaotong university(Science) 2019年第3期24卷 323-327页

作者： QIN Pinpin CHEN Chuice GUO Huanliang han yaqi MENG Qiang College of Mechanical Engineering Guangxi UniversityNanning 530004China School of Auto motive Engineering Hainan Technology and Business CollegeHaikou 570203China College of Automotive Engineering Jilin UniversityChangchun 130012China

Although there are many studies involving influence of runaway truck entry speed and longitudinal grade on stopping distance,focusing on aggregate properties is *** paper investigates the influence of the aggregate properties such as types of aggregate and river gravel radius on stopping distance through numerical analysis of particle flow code in two dimensions(PFC2D).The software is used to generate stopping distance data for two aggregate types and four group gravel radii under various approaching speeds and *** generated data are compared with the testing results of full-scale arrester *** simulated finding of this paper implies that types of aggregates and river gravel radii have a significant impact on the stopping distance for runaway truck on escape ramps.

关键词： truck escape ramp stopping distance particle flow code in two dimensions(PFC2D) aggregate property

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

Superhydrophobic magnetic Fe_(3)O_(4) polyurethane sponges for oil-water separation and oil-spill recovery

引用

Journal of Environmental Sciences 2024年第5期139卷 160-169页

作者： Shiyu Wu Yunjie Xiang yaqi Cai Jingfu Liu Sino-Danish College University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China School of Environment Hangzhou Institute for Advanced StudyUCASHangzhou 310024China School of Environmental Science and Engineering Southern University of Science and TechnologyShenzhen 518055China

The effective and affordable separation of oil and water,a crucial process in the safe han dling of environmental disasters such as crude oil spills and recovery of valuable resources is a highly sought-after yet challenging ***,superhydrophobic PU sponge was fab ricated for the fast and cost-effective adsorptive separation of oil and different organic sol vents from ***(OTS)-functionalized Fe_(3)O_(4)@SiO_(2)core-shell mi crospheres were dip-coated on the surface of porous materials via a dip-coating process thereby endowing them with *** to the hydrophobic interaction between OTS molecules and oil and increased capillary force in the micropores,the result ing superhydrophobic sponge served as a selective oil-sorbent scaffold for absorbing oil from oil-water mixtures,including oil-water suspensions and ***,after the recovery of the adsorbed oil via mechanical extrusion,these superhydrophobic materials could be reused multiple times and maintain their oil-water separation efficacy even afte 10 oil-water separation cycles.

关键词： Fe_(3)O_(4)@SiO_(2)-OTS polyurethane sponge Oil-water separation Adsorption capacity Oil-spill recovery

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

High-precision nondestructive evaluation of a thermal barrier coating based on perovskite quantum dot anion exchange

引用

Nano Research 2024年第5期17卷 4582-4592页

作者： Tao han Shufang Ding Zifan Wang Sirong Jiang Pengjiang Jing Tianshang Yi yaqi Chen Chunzhi Jiang Xiaofeng Zhang Microelectronics and Optoelectronics Technology Key Laboratory of Hunan Higher Education School of Physics and Electronic Electrical EngineeringXiangnan UniversityChenzhou 423000China National Engineering Laboratory for Modern Materials Surface Engineering Technology&The Key Lab of Guangdong for Modern Surface Engineering Technology Guangdong Institute of New MaterialsGuangdong Academy of SciencesGuangzhou 510650China

Thermal barrier coatings(TBCs)in gas turbine engines are used in expressly harsh environments;thus,assessing TBC integrity status is critical for safety and ***,traditional periodic maintenance involves visual inspections of the TBCs,requiring the gas turbine to be decommissioned and partially *** importantly,tiny defects or internal damages that easily cause coating failure cannot be *** this work,a new nondestructive evaluation(NDE)technique of TBCs based on quantum dot(QD)anion exchange is first explored *** exchanging anions between the Cl ions and the CsPbBr_(3) QDs,the degrees of salt corrosion of the TBCs are *** resultant NDE technique shows that the colour of the TBCs obviously changes from green to blue,accompanied by a large blueshift(~100 nm)of the photoluminescence(PL)peak *** addition,the relationship between the PL peak position and coating thermophysical properties indicates that the precision of this NDE technique may easily identify theμm-level of the thermal growth oxide(TGO)changes inside the TBCs.

关键词： thermal barrier coatings nondestructive evaluation CsPbBr_(3)quantum dot anion exchange thermal growth oxide

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

Integrated spatial metabolomics and transcriptomics decipher the hepatoprotection mechanisms of wedelolactone and demethylwedelolactone on non-alcoholic fatty liver disease

引用

Journal of Pharmaceutical Analysis 2024年第4期14卷 552-561页

作者： Panpan Chen Zihan Zhu Haoyuan Geng Xiaoqing Cui Yuhao han Lei Wang yaqi Zhang Heng Lu Xiao Wang Yun Zhang Chenglong Sun Key Laboratory for Natural Active Pharmaceutical Constituents Research in Universities of Shandong Province School of Pharmaceutical SciencesQilu University of Technology(Shandong Academy of Sciences)Jinan250014China Key Laboratory for Applied Technology of Sophisticated Analytical Instruments of Shandong Province Shandong Analysis and Test CenterQilu University of Technology(Shandong Academy of Sciences)Jinan250014China School of Pharmacy Shandong University of Traditional Chinese MedicineJinan250355China Biology Institute Qilu University of Technology(Shandong Academy of Sciences)Jinan250103China

Eclipta prostrata *** been used in traditional medicine and known for its liver-protective properties for ***(WEL)and demethylwedelolactone(DWEL)are the major coumarins found in *** ***,the comprehensive characterization of these two compounds on non-alcoholic fatty liver disease(NAFLD)still remains to be *** a well-established zebrafish model of thioacetamide(TAA)-induced liver injury,the present study sought to investigate the impacts and mechanisms of WEL and DWEL on NAFLD through integrative spatial metabolomics with liver-specific transcriptomics *** results showed that WEL and DWEL significantly improved liver function and reduced the accumulation of fat in the *** biodistributions and metabolism of these two compounds in whole-body zebrafish were successfully mapped,and the discriminatory endogenous metabolites reversely regulated by WEL and DWEL treatments were also *** on spatial metabolomics and transcriptomics,we identified that steroid biosynthesis and fatty acid metabolism are mainly involved in the hepatoprotective effects of WEL instead of *** study unveils the distinct mechanism of WEL and DWEL in ameliorating NAFLD,and presents a“multi-omics”platform of spatial metabolomics and liver-specific transcriptomics to develop highly effective compounds for further improved therapy.

关键词： Spatial metabolomics Transcriptomics Non-alcoholic fatty liver disease Wedelolactone Demethylwedelolactone

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

老年原发性高血压患者伴血管迷走性晕厥的相关研究

引用

中华老年心脑血管病杂志 2021年第8期23卷 800-802页

作者：吴蕊韩雅琪闫菲阜外华中心血管病医院心功能科河南省人民医院心脏中心郑州大学人民医院河南大学人民医院郑州450003

目的观察直立倾斜试验(HUTT)对老年原发性高血压患者伴血管迷走性晕厥(VVS)阳性诊断情况。方法选择2017年9月~2019年9月于我院住院或门诊诊治的老年原发性高血压疑似VVS患者40例为高血压组,选择同期因晕厥或头晕、黑矇等症状就诊的临床... 详细信息

目的观察直立倾斜试验(HUTT)对老年原发性高血压患者伴血管迷走性晕厥(VVS)阳性诊断情况。方法选择2017年9月~2019年9月于我院住院或门诊诊治的老年原发性高血压疑似VVS患者40例为高血压组,选择同期因晕厥或头晕、黑矇等症状就诊的临床无器质性疾病患者50例为对照组,2组均进行HUTT,包括基础倾斜试验(BTTT)和硝酸甘油倾斜试验(NTTT),记录HUTT阳性率,在HUTT前后检测血浆肾上腺素水平。结果高血压组与对照组HUTT阳性率比较,无显著差异(47.5%vs 54.0%,P=0.540),但高血压组BTTT阳性率显著高于对照组(30.0%vs 10.0%,P=0.016);NTTT阳性率显著低于对照组(17.5%vs 44.0%,P=0.043);HUTT阳性患者中,高血压组试验前肾上腺素水平显著高于对照组(P=0.000),2组试验后较试验前肾上腺素水平均显著升高(P=0.004,P=0.000),对照组试验后肾上腺素水平较高血压组明显升高(P=0.006)。结论部分老年原发性高血压患者出现的晕厥症状是由VVS所致,血浆肾上腺素在VVS发生过程中显著升高。

关键词：高血压晕厥血管迷走神经性倾斜台试验肾上腺素

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

Physicochemical principles of hydrogen metallurgy in blast furnace

引用

Journal of Iron and Steel Research International 2024年第1期31卷 46-63页

作者： han-jie Guo School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials Beijing100083China

Based on the stoichiometric method and the free energy minimization method,an ideal model for the reduction of iron oxides by carbon and hydrogen under blast furnace conditions was established,and the reduction efficiency and theoretical energy consumption of the all-carbon blast furnace and the hydrogen-rich blast furnace were *** results show that after the reduction reaction is completed at the bottom of the blast furnace,the gas produced by reduction at 1600℃still has a certain excessive reduction capacity,which is due to the hydrogen brought in by the hydrogen-rich blast as well as the excess carbon monoxide generated by the reaction of the coke and the oxygen brought in by the *** the process of the gas with excessive reduction capacity rising from the bottom of the blast furnace and gas reduction process,the excessive reduction capacity of the gas gradually decreases with the increase in the dydrogen content in the *** the all-carbon blast furnace,the excess gas reduction capacity is the strongest,and the total energy consumption per ton of iron reduction is the *** shows that,for the current operation mode of the blast furnace,adding hydrogen in the blast furnace cannot reduce the consumption of carbon required for reduction per ton of iron,but rather increases the consumption of carbon.

关键词： Hydrogen metallurgy Excess gas reduction capacity Theoretical energy consumption Hydrogen-rich blast furnace Thermodynamic model Gibbs minimum free energy method

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

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：