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Acta Oceanologica Sinica 2021年第1期40卷 4-12页

作者： Jiachun An Baojun Zhang songtao ai Zemin Wang Yu Feng Chinese Antarctic Center of Surveying and Mapping Wuhan UniversityWuhan 430079China State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhan 430079China Department of Brewing Engineering Moutai InstituteRenhuai 564507China

To better monitor the vertical crustal movements and sea level changes around Greenland,multiple data sources were used in this paper,including global positioning system(GPS),tide gauge,satellite gravimetry,satellite altimetry,glacial isostatic adjustment(GIA).First,the observations of more than 50 GPS stations from the international GNSS service(IGS)and Greenland network(GNET)in 2007–2018 were processed and the common mode error(CME)was eliminated with using the principal component analysis(PCA).The results show that all GPS stations show an uplift trend and the stations in southern Greenland have a higher vertical ***,by deducting the influence of GIA,the impact of current Gr IS mass changes on GPS stations was analysed,and the GIA-corrected vertical velocity of the GPS is in good agreement with the vertical velocity obtained by gravity recovery and climate experiment(GRACE).Third,the absolute sea level change around Greenland at 4 gauge stations was obtained by combining relative sea level derived from tide gauge observations and crustal uplift rates derived from GPS observations,and was validated by sea level products of satellite *** results show that although the mass loss of Gr IS can cause considerable global sea level rise,eustatic movements along the coasts of Greenland are quite complex under different mechanisms of sea level changes.

关键词： Greenland ice sheet GPS vertical crustal movement tide gauge sea level change

Quantitative analysis of Arctic ice flow acceleration with increasing temperature

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Acta Oceanologica Sinica 2021年第1期40卷 22-32页

作者： Zemin Wang Boya Yan songtao ai Kim Holmén Jiachun An Hongmei Ma Chinese Antarctic Center of Surveying and Mapping Wuhan UniversityWuhan 430079China Norwegian Polar Institute Longyearbyen 9170Norway Polar Research Institute of China Shanghai 200136China

This study explores the ice flow acceleration(21.1%)of Pedersenbreen during 2016–2017 after the extremely warm winter throughout the whole Arctic in 2015/2016 using in situ data and quantitatively analyses the factors contributing to this *** data sets,including 2008–2018 air temperature data from Ny-?lesund,ten-year in situ GPS measurements and Elmer/Ice ice flow modelling under different ice temperature scenarios,suggest that the following factors contributed to the ice flow acceleration:the softened glacier ice caused by an increase in the air temperature(1.5℃)contributed 2.7%–30.5%,while basal lubrication contributed 69.5%–97.3%.The enhanced basal sliding was mostly due to the increased surface meltwater penetrating to the bedrock under the rising air temperature conditions;consequently,the glacier ice flow acceleration was caused mainly by an increase in subglacial *** Pedersenbreen,there was an approximately one-year time lag between the change in air temperature and the change in glacier ice flow velocity.

关键词： ice flow velocity Arctic temperature rising Pedersenbreen Elmer/Ice meltwater

Ice thickness distribution and volume estimation of Burqin Glacier No.18 in the Chinese Altay Mountains

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Journal of Arid Land 2020年第6期12卷 905-916页

作者： JIN Shuang LI Zhongqin WANG Zemin WANG Feiteng XU Chunhai ai songtao Chinese Antarctic Center of Surveying and Mapping Wuhan UniversityWuhan 430079China State Key Laboratory of Cryosphere Science/Tianshan Glaciological Station Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China

Information on the thickness distribution and volume of glacier ice is highly important for glaciological applications;however,detailed measurements of the ice thickness of many glaciers in the Chinese Altay Mountains remain *** Glacier No.18 is a northeast-orientated cirque glacier located on the southern side of the Altay *** study used PulseEKKO®PRO 100A enhancement ground-penetrating radar(GPR)to survey the ice thickness and volume of Burqin Glacier No.18 in summer *** with GPR surveying,spatial distributed profiles of the GPR measurements were concurrently surveyed using the real-time kinematic(RTK)global navigation satellite system(GNSS,Unistrong E650).Besides,we used QuickBird,WorldView-2,and Landsat TM to delineate accurate boundary of the glacier for undertaking estimation of glacier ice *** measurements revealed that the basal topography of profile B1-B2 was flat,the basal topography of profile C1-C2 presented a V-type form,and the basal topography of profile D1-D2 had a typical U-type topographic feature because the bedrock near the central elevation of the glacier was relatively *** longitudinal profile A1-A2 showed a ladder-like *** ice was thin at the terminus and its thickness increased gradually from the elevation of approximately 2620 m *** the main axis of the glacier tongue with an average value of 80(±1)*** average ice thickness of the glacier was determined as 27(±2)m and its total ice volume was estimated at 0.031(±0.002)*** of remote sensing images indicated that during 1989–2016,the glacier area reduced from 1.30 to 1.17 km2(reduction of 0.37%/a)and the glacier terminus retreated at the rate of 8.48 m/*** mean ice thickness of Burqin Glacier No.18 was less than that of the majority of other observed glaciers in China,especially those in the Qilian Mountains and Central Chinese Tianshan Mountains;this is probably attributable to differences in glacier type

关键词： glacier ice thickness glacier ice volume glacier area ground-penetrating radar Bayesian kriging method mountain glacier

Sea ice concentration over the Antarctic Ocean from satellite pulse altimetry

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Science China Earth Sciences 2011年第1期54卷 113-118页

作者： YANG YuanDe E DongChen WANG ,HaiHong CHAO DingBo HWANG CheinWay LI Fei ai songtao Chinese Antarctic Center of Surveying and Mapping Wuhan University Wuhan 430079 China School of Geodesy and Geomatics Wuhan University Wuhan 430079 China Key Laboratory of Surveying and Mapping Technology on Island and Reef State Bureau of Surveying and Mapping Qingdao 266510 China Department of Civil Engineering 'National' Chiao Tung University Hsinchu Taiwan China

Sea ice concentration (SIC) is an important parameter in characterizing sea ice. Limited by the environment and the spatial extent of observation, it is difficult for field work to meet the needs of a large-scale SIC study. However, with its many advantages, such as the ability to make large-scale, high-resolution and long-duration observations, the altimeter can be used to determine SIC on a large scale. Using the correspondence between the satellite pulse altimeter waveform and reflector property, waveform classification is employed. Moreover, this paper develops an algorithm to obtain the SIC from altimeter waveforms. In an actual computation, Pyrz Bay in the Antarctic is taken as an experimental region, and one-year and seasonal SICs are derived from ERS-1/GM waveforms over this study area. Furthermore, altimetric SICs are compared with those of SSMR SSM/I. The results show that the spatial distribution and the regions of maximum SIC determined employing these two methods are consistent. This demonstrates that altimeter data can be used to monitor sea ice.

关键词： sea ice concentration Antarctic altimeter waveform SSMR SSM/I ERS-1/GM

3D Printing Hip Prostheses Offer Accurate Reconstruction,Stable Fixation,and Functional Recovery for Revision Total Hip Arthroplasty with Complex Acetabular Bone Defect

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Engineering 2020年第11期6卷 1285-1290页

作者： Yongqiang Hao Lei Wang Wenbo Jiang Wen Wu songtao ai Lu Shen Shuang Zhao Kerong Dai Department of Orthopedics Shanghai Ninth People's HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai 200011China Medical 3D Printing Innovation Research Center Shanghai Ninth People's HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai 200011China Department of Radiology Shanghai Ninth People's HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai 200011China

Complicated and large acetabular bone defects present the main challenges and difficulty in the revision of total hip arthroplasty(THA).This study aimed to explore the advantages of three-dimensional(3D)printing technology in the reconstruction of such acetabular bone *** retrospectively analyzed the prognosis of four severe bone defects around the acetabulum in three patients who were treated using 3D printing *** of bone defect by conventional methods was difficult in these *** this endeavor,we used radiographic methods,related computer software such as Materialise's interactive medical image control system and Siemens NX software,and actual surgical experience to estimate defect volume,prosthesis stability,and installation accuracy,***,a Harris hip score was obtained to evaluate limb *** was found that bone defects could be adequately reconstructed using a 3D printing prosthesis,and its stability was *** Harris hip score indicated a very good functional recovery in all three *** conclusion,3D printing technology had a good therapeutic effect on both complex and large bone defects in the revision of *** was able to achieve good curative effects in patients with large bone defects.

关键词： 3D printing Hip revision Complex and large acetabular bone defect Accurate reconstruction

Fatigue properties of titanium alloy custom short stems fabricated by electron beam melting

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Journal of Materials Science & Technology 2020年第17期52卷 180-188页

作者： Liao Wang Shujun Li Mengning Yan Yubo Cheng Wentao Hou Yiping Wang songtao ai Rui Yang Kerong Dai Shanghai Key Laboratory of Orthopaedic Implants Department of Orthopaedic SurgeryShanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai Jiao Tong UniversityShanghai 200030China Titanium Alloy Laboratory Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Image Medraw Technology(Shanghai)Company Limited Shanghai 201100China

The fatigue properties of titanium alloy short-stems with four different lengths,manufactured by electron beam melting(EBM)technology,were investigated by in vitro test and finite element(FE)*** simulation results indicate that the maximum tensile stress concentrates at the lateral side of the stem *** magnitude of the concentrated tensile stress increases and the corresponding area of the axial section decreases with increasing of stem *** from fatigue tests demonstrate that fatigue cracks mainly initiate from the rough surface of the stem where the maximum tensile stress *** fatigue strength decreases with the increase of stem length,which is attributed to the higher stress concentration on the longer stem *** addition,it is found that post EBM treatment via hot isostatic processing(HIP)is able to enhance the fatigue properties of the stems,since the pores generated during EBM are mostly closed during *** work also demonstrates that the stress concentration on the stem surface can be effectively mitigated and the corresponding fatigue properties of the EBM-fabricated titanium alloy short stem can be considerably improved by optimizing the design in the stem length.

关键词： Custom short stem Titanium alloy Electron beam melting Fatigue property

基于无人机正射影像的玉龙雪山白水河1号冰川末端冰裂隙提取

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冰川冻土 2024年第1期46卷 335-346页

作者：罗重鑫季青庞小平杨元德艾松涛茶明星王世金车彦军武汉大学中国南极测绘研究中心湖北武汉430079 中国科学院西北生态环境资源研究院冰冻圈科学国家重点实验室云南丽江玉龙雪山冰冻圈与可持续发展国家野外科学观测研究站甘肃兰州730000 安徽师范大学地理与旅游学院安徽芜湖241002 宜春学院江西宜春336000

冰川是冰冻圈的重要部分,对局地乃至全球气候变化响应敏感。冰裂隙作为冰川表面上显著的特征,对于认识冰川的状态、稳定性以及内部应力有着重要的作用。针对冰川冰裂隙高精度快速识别提取问题,本文以玉龙雪山白水河1号冰川为研究对象,... 详细信息

冰川是冰冻圈的重要部分,对局地乃至全球气候变化响应敏感。冰裂隙作为冰川表面上显著的特征,对于认识冰川的状态、稳定性以及内部应力有着重要的作用。针对冰川冰裂隙高精度快速识别提取问题,本文以玉龙雪山白水河1号冰川为研究对象,使用无人机航拍获取的0.12 m分辨率的正射影像,应用U-Net深度学习网络开展白水河1号冰川的冰裂隙的智能提取研究。使用U-Net网络提取冰裂隙的精度高于传统的Canny算子以及SVM算法,总体精度可高达93%,且U-Net网络泛化能力强。提取结果表明,白水河1号冰川冰裂隙主要为横向裂隙,伸展裂隙以及雁行裂隙,呈现随海拔降低,冰裂隙逐渐由横向裂隙变化为伸展裂隙的趋势,通过不同时期提取结果对比,发现冰裂隙数量和平均长度均有增加。基于无人机影像和深度学习方法的冰裂隙智能提取研究,可为监测冰川变化及其与气候变化的关系提供技术支撑。

关键词：冰裂隙无人机影像 U-Net 白水河1号冰川

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南极验潮站对全球地震海啸的响应

地球物理学报 2023年第3期66卷 1015-1024页

作者：陈帅均艾松涛武汉大学中国南极测绘研究中心武汉430079 湖北珞珈实验室武汉430079 极地测绘科学自然资源部重点实验室武汉430079

现有对南极潮汐的研究主要聚焦在海平面变化、高程转换和常规调和分析,针对南极验潮站的潮位异常分析还很少见.本文聚焦南极验潮站数据中的异常潮位记录,提取到达南极的全球地震海啸事件,并分析南极不同验潮站对全球地震海啸的响应能力... 详细信息

现有对南极潮汐的研究主要聚焦在海平面变化、高程转换和常规调和分析,针对南极验潮站的潮位异常分析还很少见.本文聚焦南极验潮站数据中的异常潮位记录,提取到达南极的全球地震海啸事件,并分析南极不同验潮站对全球地震海啸的响应能力.本文首先利用潮汐调和分析去除验潮数据中的趋势项,分析余水位中较大幅度的潮位异常信号,然后通过对比不同方法,选取2.5倍标准差作为阈值提取到达南极的全球地震海啸事件.得出潮位异常信息点后,本文对比了各个验潮站点对地震海啸事件响应的敏感性与地理位置的关系,发现东南极威尔克斯地和南极半岛及其附近岛屿的验潮站更能响应全球地震海啸事件,长城站等8个站点适合开展全球地震海啸事件的响应和记录研究.

关键词：南极潮汐调和分析余水位地震海啸响应能力

Image Registration Technique for Assessing the Accuracy of Intraoperative Osteotomy for Pelvic Tumors by 3D-Printed Patient-Specific Templates

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Journal of Shanghai Jiaotong university(Science) 2021年第3期26卷 306-311页

作者： QU Yang YAN Mengning LI Xiaomin WU Bing LIU Siyu WANG Liao WU Wen ai songtao Department of Radiology Shanghai Jiao Tong University School of MedicineShanghai200011China Shanghai Key Laboratory of Orthopaedic Implants Department of OrthopaedicsShanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai200011China

The study aimed to explore the feasibility of an image registration technique for assessing the accuracy of intraoperative osteotomy of pelvic tumors by 3-dimensional(3D)-printed patient-specific *** with malignant pelvic tumors who were admitted to our hospital between March 2014 and December 2020 were retrospectively *** underwent hemi-pelvic resection and reconstruction by 3D-printed individualized *** registration between the designed model and the postoperative segmented model of the prosthesis was used to obtain the intraoperative osteotomy plane and reduce metal artifacts in postoperative computed tomography(CT)*** distance and angle between the planned and actual osteotomy planes were then used to assess the accuracy of the intraoperative *** patients with 13 osteotomy planes were enrolled,including four males and four *** median age at the time of imaging examination was 44 years(range,33–54 years).All intraoperative osteotomy planes were assessed *** mean distance between the planned and true intraoperative osteotomy planes was−0.69 cm(−7.5–7.35 cm),and the mean angle was 6.57°±3.36°(1.05°–11.88°).This new assessment method of registering the designed model and the postoperative CT segmented model of the prosthesis may be used to assess the accuracy of intraoperative osteotomy for pelvic tumors,using 3D printed patient-specific templates.

关键词： pelvic tumor image registration 3D-printed patient-specific template intraoperative osteotomy

Review on Corrosion Characteristics of Porous Titanium Alloys Fabricated by Additive Manufacturing

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Journal of Shanghai Jiaotong university(Science) 2021年第3期26卷 416-430页

作者： Gai Xin Bai Yun LI Shujun WANG Liao ai songtao HAO Yulin YANG Rui Dai Kerong Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China Shanghai Key Laboratory of Orthopaedic Implants Department of Orthopaedic SurgeryShanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai200011China

Porous titanium and its alloys have been considered as promising implants owing to their low elastic modulus and capability to provide channels for bone ***,additive manufacturing(3D printing)techniques have been successfully applied to produce porous titanium alloys owing to the advantages of controllable and precise *** the safety aspect,an understanding of corrosion in porous titanium alloys and the corresponding mechanisms is important for their long-term application in the human *** this paper,the recent progress in improving the corrosion properties of porous titanium alloys fabricated via 3D printing techniques is *** effects of pore type,porosity,electrolyte,and modification of the material on the corrosion properties of porous titanium alloys are introduced and *** addition,the limitations of traditional methods for measuring the corrosion performance of porous titanium alloys were *** for evaluating and improving the corrosion performance of porous titanium alloys using new methods are provided.

关键词： porous titanium alloys implant 3D printing corrosion