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水下智能海草培育机器人的研究与设计

福建电脑 2024年第8期40卷 17-21页

作者：林培豪刘大召广东海洋大学电子与信息工程学院广东湛江524088 广东省海洋遥感与信息技术工程技术中心广东湛江524088

在气候变化和人类活动的影响下,海草床面积不断减少。传统的人力修复方法效率低且危险系数大。为代替人力进行海草培育,本文设计一款水下智能海草培育机器人。该机器人基于灵活可调的机械臂装置和多元化传感器模块,同时引入岸电供能系... 详细信息

在气候变化和人类活动的影响下,海草床面积不断减少。传统的人力修复方法效率低且危险系数大。为代替人力进行海草培育,本文设计一款水下智能海草培育机器人。该机器人基于灵活可调的机械臂装置和多元化传感器模块,同时引入岸电供能系统等模块,能稳定、精准地在水下作业并实时监测环境参数,确保续航能力,以满足海草培育任务的需求。实验结果表明,该水下智能机器人可有效执行海草培育任务,为海洋生态保护和修复提供了新的技术手段。

关键词：海草床面积海草培育水下机器人

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石墨烯增强铜复合材料摩擦性能研究

安徽工程大学学报 2024年第2期39卷 19-23页

作者：王昊王秒刘大钊吴磊安徽华东光电技术研究所有限公司微波真空事业部安徽芜湖241002 安徽工程大学材料科学与工程学院安徽芜湖241000 安徽省春谷3D打印智能装备产业技术研究院安徽芜湖241000

通过原位合成石墨烯结合粉末烧结法制备了石墨烯增强铜复合材料,然后在空气环境中研究石墨烯增强铜复合材料的摩擦性能。实验选用直径为6 mm的WC磨球与复合材料组成摩擦副,利用摩擦磨损试验机对材料进行摩擦磨损测试。采用SEM、EBSD、ED... 详细信息

通过原位合成石墨烯结合粉末烧结法制备了石墨烯增强铜复合材料,然后在空气环境中研究石墨烯增强铜复合材料的摩擦性能。实验选用直径为6 mm的WC磨球与复合材料组成摩擦副,利用摩擦磨损试验机对材料进行摩擦磨损测试。采用SEM、EBSD、EDS和三维轮廓形貌仪等相关检测设备对复合材料的微观组织结构以及磨损的表面形貌结构进行分析表征。结果表明,相比于纯铜材料,石墨烯增强铜复合材料具有更低的摩擦系数,这主要归功于复合材料较高的硬度以及石墨烯的自润滑效应。最后结合复合材料的磨损形貌给出了相关的磨损机制。

关键词：石墨烯铜基复合材料硬度摩擦性能

Analysis of the regional spectral properties in northwestern South China Sea based on an empirical orthogonal function

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Acta Oceanologica Sinica 2020年第7期39卷 107-114页

作者： Dongyang Fu Yuye Huang dazhao liu Shan Liao Guo Yu Xiaolong Zhang College of Electronic and Information Engineering Guangdong Ocean UniversityZhanjiang 524088China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China University of Chinese Academy of Sciences Beijing 100049China

This study presents an analysis of the spectral characteristics of remote sensing reflectance(Rrs)in northwestern South China Sea based on the in situ optical and water quality data for August *** initially divided into four classes,classes A to D,using the max-classification algorithm,and the spectral properties of whole Rrs were characterized using the empirical orthogonal function(EOF)***,the dominant factors in each EOF mode were *** results indicated that more than 95%of the variances of Rrs are partly driven by the back-scattering characteristics of the suspended *** initial two EOF modes were well correlated with the total suspended matter and back-scattering ***,the first EOF modes of the four classes of Rrs(A-D Rrs-EOF1)significantly contributed to the total variances of each Rrs *** addition,the correlation coefficients between the amplitude factors of class A-D Rrs-EOF1 and the variances of the relevant water quality and optical parameters were better than those of the unclassified *** spectral shape of class ARrs-EOF1 was governed by the absorption characteristic of chlorophyll a and colored dissolved organic matter(CDOM).The spectral shape of class B Rrs-EOF1 was governed by the absorption characteristic of CDOM since it exhibited a high correlation with the absorption coefficient of CDOM(ag(λ)),whereas the spectral shape of class C Rrs-EOF1 was governed by the back-scattering characteristics but not affected by the suspended *** spectral shape of class D Rrs-EOF1 exhibited a relatively good correlation with all the water quality parameters,which played a significant role in deciding its spectral shape.

关键词： northwestern South China Sea remote sensing reflectance empirical orthogonal function analysis ocean color control factors

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基于色相角算法的珠江口赤潮遥感识别

中山大学学报（自然科学版）（中英文） 2024年第1期63卷 96-104页

作者：许源兴孙琰肖鹤艾彬刘大召广东海洋大学电子与信息工程学院广东湛江524088 中山大学海洋科学学院广东珠海519082 南方海洋科学与工程广东省实验室(珠海) 广东珠海519082 广东省海洋遥感与信息技术工程技术中心广东湛江524088

为实现珠江口高分辨率赤潮遥感识别,科学支撑赤潮灾害防灾减灾工作,利用海洋一号C/D卫星搭载的海岸带成像仪高空间分辨率数据,在分析珠江口近岸浑浊水体、干净水体和赤潮水体遥感影像光谱特征基础上,通过计算水体色相角并结合目视解译... 详细信息

为实现珠江口高分辨率赤潮遥感识别,科学支撑赤潮灾害防灾减灾工作,利用海洋一号C/D卫星搭载的海岸带成像仪高空间分辨率数据,在分析珠江口近岸浑浊水体、干净水体和赤潮水体遥感影像光谱特征基础上,通过计算水体色相角并结合目视解译识别珠江口赤潮。利用该方法成功识别2020年10月26日—11月6日在珠江口海域发生的双胞旋沟藻赤潮。利用色相角能够很好地识别出珠江口海域的赤潮;赤潮水体的色相角在58°~61°变化;该方法对形成初期的小范围赤潮、低密度赤潮和条带状赤潮具有很好的识别效果。

关键词：珠江口赤潮 HY-1C/D 色相角

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Estimation of total suspended matter in the Zhujiang (Pearl) River estuary from Hyperion imagery

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Chinese Journal of Oceanology and Limnology 2012年第1期30卷 16-21页

作者： liu dazhao FU Dongyang XU Bing SHEN Chunyan Ocean Remote Sensing and Information Laboratory Guangdong Ocean UniversityZhanjiang 524088China

Although remote sensing data have been used to estimate total suspended matter （TSM） in coastal waters, it has limitations when applied to estuary waters in low spatial resolution situations. The spatial resolution of ocean color satellites such as SeaWiFS and MODIS is usually -1 km, and therefore is not adequate for small, local-scale areas such as the Zhujiang （Pearl） River estuary. In contrast, 30 m-resolution EO-1 Hyperion imagery has potential for studying TSM in localized areas. We measured the surface spectral radiance reflectance of the river estuary water in the visible and near infra-red spectral range. Sensitivity analysis indicated that the ratio of remote sensing reflectance at 813 nm （Rrs（813）） to reflectance at 559 nm （Rrs（559）） could be used to estimate TSM concentration, and a linear relationship was established between the ratio and in-situ TSM concentration. We applied the linear relationship to Hyperion imagery to map TSM concentration in the estuary. The Hyperion imagery provided sufficient spatial resolution to detect spatiotemporal changes in TSM concentrations in the estuary small estuary area. This study demonstrated the usefulness of Hyperion imagery for mapping the distribution of TSM in estuary waters. Keyword： Hyperion; total suspended matter （TSM）; Zhujiang （Pearl） River estuary

关键词： Hyperion total suspended matter (TSM) Zhujiang (Pearl) River estuary

Remote sensing analysis of mangrove distribution and dynamics in Zhanjiang from 1991 to 2011

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Journal of Oceanology and Limnology 2018年第5期36卷 1597-1603页

作者： liu dazhao LI Shanshan FU Dongyang SHEN Chunyan Guangdong Ocean University Zhanjiang 524088China School of Tourism and Geographical Sciences Guangdong University of Finance&EconomicsGuangzhou 510320China

Mangrove forests provide valuable societal and ecological services and goods. However, they have been experiencing high annual rates of loss in many parts of the world. In order to evaluate a long-term wetland conservation strategy that compromises urban development with comprehensive wetland ecosystem management, remote sensing techniques were used to analyze the changing mangrove distribution in the Zhanjiang Mangrove Forest National Nature Reserve. Between 1991 and 2000, the mangrove area within the study region declined from 2 264.9 to 2 085.9 ha consistent with an annual decrease of 0.79%. However, there was an overall 34.3% increase in mangrove coverage from 2 085.9 to 2 801.8 ha between 2000 and 2011. Major causes of forest loss include local human pressures in the form of deforestation, conversion to agriculture, and natural forces such as erosion. The recent gain in mangrove forest cover is attributed to eff ective conservation management in the nature reserve area, including intensive mangrove plantation eff orts and increased local awareness of wetland conservation.

关键词： mangrove landsat TM/ETM+ HJ-1A conservation remote sensing

Factors affecting spring bloom in the South of Cheju Island in the East China Sea

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Acta Oceanologica Sinica 2015年第3期34卷 51-58页

作者： FU Dongyang HUANG Zhaojun ZHANG Yuanzhi PAN Delu DING Youzhua liu dazhao ZHANG Ying MAO Zhihua CHEN Jianfang Laboratory of Remote Sensing and Information Technology Guangdong Ocean University Shenzhen Research Institute Chinese University of Hong Kong State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of Oceanography State Oceanic Administration

A soil circulation occurs in the south of Cheju Island in the spring. Nutrients and its influence on chloro-phyll a （Chla） around the circulations were studied from April 9 to May 6, 2007. Spring bloom with elevated concentrations of Chla was observed during the investigation. High concentrations of phosphate, nitrate and silicate at 0.6, 12, and 8 mmol/m3, respectively, were detected. A low water temperature prevented the growth of phytoplankton. Chla concentrations in the study area might be strongly associated with the high silicate concentration.

关键词： phosphate nitrate silicate phytoplankton circulation

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高水位下粉土地基轻型井点降水技术研究

土工基础 2024年第4期38卷 573-577页

作者：靳涛李雪飞刘大召荣传彪谢阳发朱秋中国建筑第五工程局有限公司长沙410000 河南理工大学土木工程学院河南焦作454000 湖南交通工程学院湖南衡阳421000 中国建筑第一工程局第二建筑有限公司北京102600

高水位会带来一系列岩土工程的问题,特别是对于降水量大、地下水变化大且地质不良的地区,更会对地下建(构)带来更大挑战。结合高水位且地基为粉土的工程实例,首先对比不同降水技术的优缺点,选择科学有效的降水处理技术,然后阐述其施工... 详细信息

高水位会带来一系列岩土工程的问题,特别是对于降水量大、地下水变化大且地质不良的地区,更会对地下建(构)带来更大挑战。结合高水位且地基为粉土的工程实例,首先对比不同降水技术的优缺点,选择科学有效的降水处理技术,然后阐述其施工工艺和注意事项,对降水效果进行了分析,最后跟进了后期的沉降监测,为以后同类型的建筑工程积累更多的技术应用经验。研究结果表明:根据实际情况进行合理安排,轻型井点降水在本项目中降水效果良好,可以满足后续施工;对后期的沉降进行了监测,后期监测均满足规范要求。

关键词：高水位粉土地基轻型井点降水降水效果沉降监测

Three-dimensional nanoscale vortex line visualization and chiral nanostructure fabrication of tightly focused multi-vortex beams via direct laser writing

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Photonics Research 2024年第1期12卷 70-77页

作者： MENGDI LUO JISEN WEN PENGCHENG MA QIUYUAN SUN XIANMENG XIA GANGYAO ZHAN ZHENYAO YANG LIANG XU dazhao ZHU CUIFANG KUANG XU liu Research Center for Intelligent Chips and Devices Zhejiang LabHangzhou 311100China State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China ZJU-Hangzhou Global Scientific and Technological Innovation Center Hangzhou 311200China

Optical singularity is pivotal in nature and has attracted wide interest from many disciplines nowadays,including optical communication,quantum optics,and biomedical *** vortex lines formed by phase singularities and fabricating chiral nanostructures using the evolution of vortex lines are of great *** this paper,we introduce a promising method based on two-photon polymerization direct laser writing(2PP-DLW)to record the morphology of vortex lines generated by tightly focused multi-vortex beams(MVBs)at the *** to Gouy phase,the singularities of the MVBs rotate around the optical axis and move towards each other when approaching the focal *** propagation dynamics of vortex lines are recorded by 2PP-DLW,which explicitly exhibits the evolution of the phase ***,the MVBs are employed to fabricate stable three-dimensional chiral nanostructures due to the spiral-forward property of the vortex *** of the obvious chiral features of the manufactured nanostructures,a strong vortical dichroism is observed when excited by the light carrying orbital angular momentum.A number of applications can be envisioned with these chiral nanostructures,such as optical sensing,chiral separation,and information storage.

关键词： vortex chiral singularity