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Retrieval of Antarctic sea ice freeboard and thickness from HY-2B satellite altimeter data

Acta Oceanologica Sinica 2024年第3期43卷 87-101页

作者： yizhuo chen Xiaoping Pang Qing Ji Zhongnan Yan Zeyu Liang chenlei Zhang Chinese Antarctic Center of Surveying and Mapping Wuhan UniversityWuhan 430079China Key Laboratory of Polar Surveying and Mapping Science Ministry of Natural ResourcesWuhan 430079China Key Laboratory of Polar Environment Monitoring and Public Governance Ministry of EducationWuhan 430079China 4 School of Geography and Tourism Anhui Normal UniversityWuhu 241002China

Antarctic sea ice is an important part of the Earth’s atmospheric system,and satellite remote sensing is an important technology for observing Antarctic sea *** Chinese Haiyang-2B(HY-2B)satellite altimeter data could be used to estimate sea ice freeboard and provide alternative Antarctic sea ice thickness information with a high precision and long time series,as other radar altimetry satellites can,needs further *** paper proposed an algorithm to discriminate leads and then retrieve sea ice freeboard and thickness from HY-2B radar altimeter *** first collected the Moderate-resolution Imaging Spectroradiometer ice surface temperature(IST)product from the National Aeronautics and Space Administration to extract leads from the Antarctic waters and verified their accuracy through Sentinel-1 Synthetic Aperture Radar ***,a surface classification decision tree was generated for HY-2B satellite altimeter measurements of the Antarctic waters to extract leads and calculate local sea surface *** then estimated the Antarctic sea ice freeboard and thickness based on local sea surface heights and the static equilibrium ***,the retrieved HY-2B Antarctic sea ice thickness was compared with the CryoSat-2 sea ice thickness and the Antarctic Sea Ice Processes and Climate(ASPeCt)ship-based observed sea ice *** results indicate that our classification decision tree constructed for HY-2B satellite altimeter measurements was reasonable,and the root mean square error of the obtained sea ice thickness compared to the ship measurements was 0.62 *** proposed sea ice thickness algorithm for the HY-2B radar satellite fills a gap in this application domain for the HY-series satellites and can be a complement to existing Antarctic sea ice thickness products;this algorithm could provide long-time-series and large-scale sea ice thickness data that contribute to research on global climate change.

关键词： HY-2B satellite altimeter classification decision tree sea ice freeboard and thickness Antarctic waters

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高深知识视角下的大学课程:内涵及评价

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江苏高教 2024年第8期 82-90页

作者：文雯周璐陈毅卓清华大学教育研究院北京100084

文章从高深知识的角度探究大学课程的内涵,构建了包括专门化、高阶认知、研究性、跨学科性、社会适应性等五个关键特征的评价指标。通过对2021年中国大学生学习与发展追踪调查数据及质性访谈材料的综合分析,发现大学课程是本科教育的核... 详细信息

文章从高深知识的角度探究大学课程的内涵,构建了包括专门化、高阶认知、研究性、跨学科性、社会适应性等五个关键特征的评价指标。通过对2021年中国大学生学习与发展追踪调查数据及质性访谈材料的综合分析,发现大学课程是本科教育的核心环节,尤其是课程的社会适应性,对所有类型高校学生的教育收获均具有重要的激发作用,但中国各类院校整体课程质量仍存在较大改进空间,尤其在社会适应性、高阶认知、研究性和跨学科性等方面有较大不足。此外,应用型院校课程质量的各项指标得分均显著低于学术型院校,在课程上未能实现特色发展以及发挥比较优势。

关键词：大学课程课程质量评价人才培养高深知识高校分类

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ICESat-2高程信息辅助下的北极冰区航线规划

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武汉大学学报（信息科学版） 2024年第9期49卷 1610-1620页

作者：赵羲霍瑞陈亦卓马跃季青庞小平武汉大学中国南极测绘研究中心湖北武汉430079 武汉大学极地测绘科学国家测绘地理信息局重点实验室湖北武汉430079 武汉大学电子信息学院湖北武汉430072

为了实现北极航道重点区域海冰冰情的精准监测,高分辨率的海冰厚度信息必不可少,而目前普遍存在的千米级分辨率的海冰厚度数据无法满足该需求。针对以上问题,借助冰、云和陆地高程卫星(ice,cloud,and land elevation satellite-2,ICESat... 详细信息

为了实现北极航道重点区域海冰冰情的精准监测,高分辨率的海冰厚度信息必不可少,而目前普遍存在的千米级分辨率的海冰厚度数据无法满足该需求。针对以上问题,借助冰、云和陆地高程卫星(ice,cloud,and land elevation satellite-2,ICESat-2)测高数据沿轨间隔密集的优势,尝试建立ICESat-2 ATL10海冰干舷产品和哨兵2号(Sentinel-2)高分辨率影像反照率之间的回归模型。利用此模型获取密集分布的海冰干舷信息,通过静力平衡方程模型得到高分辨率的海冰厚度,结合基于Sentinel-2影像获取的高分辨率海冰密集度,对船舶进行北极航道小尺度区域下的适航性分析并规划最优航线。研究表明,ATL10海冰干舷值和Sentinel-2反照率拟合得到的回归模型具有较好的拟合精度,R^(2)均高于0.5,平均偏差均小于0.05 m,均方根误差均小于0.2 m。此外,高分辨率海冰参数信息对真实冰情细节之处的描述更加准确,尤其是在低分辨率海冰参数结果中较难体现浮冰间细小冰间水道的分布情况,因此所提高分辨率海冰参数反演方法可以为冰区船舶规划出更加精确的航行路线。

关键词： ICESat-2 海冰密集度海冰厚度航线规划

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用于空气捕集CO_(2)的多孔复合吸附剂载体优化和解吸性能研究

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化工新型材料 2024年第9期52卷 215-221页

作者：付林王正峰陈依卓王泽斌刘卫山王涛中国电力工程顾问集团西北电力设计院有限公司西安710075 中国能源建设集团广东省电力设计研究院有限公司广州510663 浙江大学能源清洁利用国家重点实验室杭州310027

空气直接捕集CO_(2)技术(DAC)是一种灵活有效的减排方式,其中,变湿再生吸附技术仅利用常温常压下水分子的蒸发自由能即可实现超低分压CO_(2)的吸附分离,突破常规变温/变压再生吸附技术的高能耗限制,被认为是当下最具前景的低能耗捕集技... 详细信息

空气直接捕集CO_(2)技术(DAC)是一种灵活有效的减排方式,其中,变湿再生吸附技术仅利用常温常压下水分子的蒸发自由能即可实现超低分压CO_(2)的吸附分离,突破常规变温/变压再生吸附技术的高能耗限制,被认为是当下最具前景的低能耗捕集技术之一。针对空气直接捕集CO_(2)领域吸附剂的关键制备工艺,改进了相转换法成型工艺,并对最优的多孔复合吸附剂进行解吸性能研究。通过选用季铵型强碱性离子交换树脂D290作为活性吸附组分,醋酸纤维素(CA)和聚醚砜(PES)作为惰性载体,优化活性树脂与载体的配比,筛选出具有最优吸附解吸性能的多孔复合吸附剂。结果表明:活性组分和CA配比为6∶4的D290/CA型吸附剂的吸附性能(0.70mmol/g)和解吸性能(0.23mmol/g)最优;多孔复合吸附剂的解吸率随着解吸温度提高(45℃,解吸附率为85%)而上升;随解吸环境CO_(2)分压提高而下降,在85%吸附饱和度下,CO_(2)分压由1000×10^(-6)增至1500×10^(-6)时,解吸附速率由0.0005s^(-1)快速下降至0.00015s-1;最后,合理减小多孔复合吸附剂的厚度可在一定程度上提高其解吸附速率。

关键词：空气直接CO_(2)捕集变湿再生离子交换树脂解吸附动力学

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Analysis of sea ice conditions and navigability in the Arctic Northeast Passage during the summer from 2002-2021

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Geo-Spatial Information Science 2023年第3期26卷 465-479页

作者： Xiaoping Pang chenlei Zhang Qing Ji yizhuo chen Zeng Zhen Yamin Zhu Zhongnan Yan Chinese Antarctic Center of Surveying and Mapping Wuhan UniversityWuhanChina School of Resource and Environmental Sciences Wuhan UniversityWuhanChina

The decreasing of Arctic sea ice is projected to continue with global warming,which makes the summer navigation conditions of the Arctic *** on the multi-source remote-sensing data with inter-sensor calibration processing and the ship-based observational data from R/V Xuelong and M/V Yongsheng,the sea ice conditions of the Arctic Northeast Passage(NEP)during the 2002-2021 summer seasons were analyzed,and the navigability of the NEP between July and October from 2002 to 2021 was ***-sensor calibration could effectively reduce the deviation from different passive microwave *** ice extent and thickness in the NEP decreased annually,which resulted in the navigability of the NEP showing a potential tendency toward improvement in *** navigation period was mainly concentrated in early August to early *** middle part of the NEP was primarily affected by sea *** influence decreased over time,while the navigation period increased,especially in the Vilkitsky Strait,which is a key shipping *** analysis of sea ice conditions and navigability in the past 20 years could provide a reference for future scientific investigations and aid in merchant ship navigation in the Arctic summer.

关键词： Arctic Northeast Passage(NEP) inter-calibration sea ice thickness sea ice extent navigability

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Retrieval of snow depth on Antarctic sea ice from the FY-3D MWRI data

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Acta Oceanologica Sinica 2023年第12期42卷 105-117页

作者： Zhongnan Yan Xiaoping Pang Qing Ji yizhuo chen Chongxin Luo Pei Fan Zeyu Liang Chinese Antarctic Center of Surveying and Mapping Wuhan UniversityWuhan 430079China Key Laboratory of Polar Surveying and Mapping Science Ministry of Natural ResourcesWuhan 430079China

The snow depth on sea ice is an extremely critical part of the *** and understanding changes of snow depth on Antarctic sea ice is beneficial for research on sea ice and global climate *** Microwave Radiation Imager(MWRI)sensor aboard the Chinese FengYun-3D(FY-3D)satellite has great potential for obtaining information of the spatial and temporal distribution of snow depth on the sea *** comparing in-situ snow depth measurements during the 35th Chinese Antarctic Research Expedition(CHINARE-35),we took advantage of the combination of multiple gradient ratio(GR(36V,10V)and GR(36V,18V))derived from the measured brightness temperature of FY-3D MWRI to estimate the snow *** method could simultaneously introduce the advantages of high and low GR in the snow depth retrieval model and perform well in both deep and shallow snow *** on this,we constructed a novel model to retrieve the FY-3D MWRI snow depth on Antarctic sea *** new model validated by the ship-based observational snow depth data from CHINARE-35 and the snow depth measured by snow buoys from the Alfred Wegener Institute(AWI)suggest that the model proposed in this study performs better than traditional models,with root mean square deviations(RMSDs)of 8.59 cm and 7.71 cm,respectively.A comparison with the snow depth measured from Operation IceBridge(OIB)project indicates that FY-3D MWRI snow depth was more accurate than the released snow depth product from the *** Snow and Ice Data Center(NSIDC)and the National Tibetan Plateau Data Center(NTPDC).The spatial distribution of the snow depth from FY-3D MWRI agrees basically with that from ICESat-2;this demonstrates its reliability for estimating Antarctic snow depth,and thus has great potential for understanding snow depth variations on Antarctic sea ice in the context of global climate change.

关键词： snow depth Antarctic sea ice passive microwave FY-3D

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A Cross-modal Fusion Network Based on Graph Feature Learning For Multimodal Emotion Recognition

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The Journal of China Universities of Posts and Telecommunications 2024年

作者： Cao Xiaopeng Zhang Linying chen Qiuxian Ning Hailong Dong yizhuo School of Computer， Xi'an University of Posts and Telecommunications

In the realm of human-computer interaction， accurately discerning the user's emotional state during a conversation has become increasingly critical. Multimodal emotion recognition has garnered considerable attention. However， the task of multimodal emotion recognition still faces several challenges. Especially， the models are unable to effectively extract multimodal contextual and interaction information， which results in a significant redundancy in the concatenated features representation. To mitigate this issue， a cross-modal fusion network based on graph feature learning (CFNet-GFL) model is proposed. Firstly， the model employs a cross-modal module to integrate multiple feature representations， resulting in more precise feature embedding. This alleviates the issue of information redundancy in the fusion process. Secondly， the model leverages a graph-based feature learning approach to extract intra-modal contextual preferences and inter-modal information interactions. By capturing the diversity and consistency of multimodal information， the model enhances the ability to understand emotions. Finally， The performance of the CFNet-GFL model is demonstrated by some experiments on the IEMOCAP and MELD datasets. The w-F1 scores show a significant improvement of approximately 2.08% and 1.36% respectively. These findings demonstrate the effectiveness of the model in multimodal emotion recognition.

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A nonradiographic strategy to real-time monitor the position of three-dimensional-printed medical orthopedic implants by embedding superparamagnetic Fe_(3)O_(4) particles

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Interdisciplinary Materials 2024年第1期3卷 133-149页

作者： Yike Li Peng chen Zhenhua Wu Congcan Shi Peng chen yizhuo Xu Xiaojun chen Manhui chen Yuxin Li Chunze Yan Yunsong Shi Bin Su State Key Laboratory of Material Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanPeople's Republic of China School of Materials Science and Engineering Wuhan University of TechnologyWuhanPeople's Republic of China Department of Orthopaedics Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanPeople'sRepublic of China

Monitoring the position of orthopedic implants in vivo is paramount for enhancing postoperative *** radiographic methods,although effective,pose inconveniences to patients in terms of specialized equipment requirements and delays in rehabilitation ***,a nonradiographic design concept for real-time and precisely monitoring the position of in vivo orthopedic implants is *** monitoring system encompasses an external magnetic field,a three-dimensional(3D)-printed superparamagnetic intervertebral body fusion cage(SIBFC),and a *** SIBFC with a polyetheretherketone framework and a superparamagnetic Fe_(3)O_(4) component was integrally fabricated by the high-temperature selective laser sintering *** to the superparamagnetic component,the minor migration of SIBFC within the spine would cause the distribution change of the magnetic induction intensities,which can be monitored in real-time by the magnetometer no matter in the static states or dynamic bending *** horizontal migration,occurrences of intervertebral subsidence in the vertical plane of the vertebrae can also be effectively distinguished based on the obtained characteristic variations of magnetic induction *** strategy exemplifies the potential of superparamagnetic Fe_(3)O_(4) particles in equipping 3D-printed orthopedic implants with wireless monitoring capabilities,holding promise for aiding patients'rehabilitation.

关键词： 3D printing implanted medical devices orthopedic rehabilitation position monitoring superparamagnetic

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基于CryoSat-2卫星测高数据分析南极海冰厚度的时空变化

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冰川冻土 2019年第5期41卷 1214-1220页

作者：陈亦卓季青庞小平武汉大学中国南极测绘研究中心湖北武汉430079 自然资源部极地测绘科学重点实验室湖北武汉430079

利用卫星测高数据能够获取大尺度、长时序的海冰厚度信息。相较于北极,目前南极海冰厚度特别是近期变化信息仍很缺乏。基于2013-2018年的CryoSat-2卫星测高数据,采用最低点高程法和静力平衡方程模型反演了近6年逐月平均海冰厚度并分析... 详细信息

利用卫星测高数据能够获取大尺度、长时序的海冰厚度信息。相较于北极,目前南极海冰厚度特别是近期变化信息仍很缺乏。基于2013-2018年的CryoSat-2卫星测高数据,采用最低点高程法和静力平衡方程模型反演了近6年逐月平均海冰厚度并分析其时空变化规律。结果表明:2013-2018年南极海冰厚度整体呈现先上升后下降的趋势,其中,2014-2017年年平均海冰厚度表现为快速变薄。南极较厚的海冰集中在威德尔海西南海域,最大值出现在该海域2014年的7月(6.27 m)。年平均海冰厚度在2017年达到最低值。南极海冰厚度的时空变化研究可为深入研究海冰变化与全球变化的关系提供参考。

关键词：海冰厚度时空变化卫星测高南极

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行政规范性文件司法审查的另一领域——民事诉讼

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法律适用 2017年第8期 70-73页

作者：陈依卓宁王志伟中国人民公安大学法学院北京市西城区人民法院民五庭中国政法大学刑事司法学院北京市西城区人民法院立案一庭

法院在审理民事案件时也常常遇到对行政规范性文件的审查问题,在审查方式与审查限度等方面,可以参考行政诉讼法的规定。当然,民事诉讼中对行政规范性文件的司法审查又有其特殊性。

关键词：行政规范性文件司法审查民事诉讼

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