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Potential of Multi‑temporal InSAR for Detecting Retrogressive Thaw Slumps: A Case of the Beiluhe Region of the Tibetan Plateau

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International Journal of Disaster Risk Science 2023年第4期14卷 523-538页

作者： Zhiping Jiao Zhida Xu Rui Guo Zhiwei Zhou liming jiang State Key Laboratory of Geodesy and Earth’s Dynamics Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430077China University of Chinese Academy of Sciences Beijing 100049China

Permafrost degradation due to climate warming is severely reducing slope stability by increasing soil pore water pressure and decreasing shear strength.Retrogressive thaw slumps(RTSs)are among the most dynamic landforms in permafrost areas,which can result in the instability of landscape and ecosystem.However,the spatiotemporal characteristics of surface deformation of RTSs are still unclear,and the potentials of deformation properties in mapping large-scale RTSs need to be further assessed.In this study,we applied a multi-temporal Interferometric Synthetic Aperture Radar(MT-InSAR)method to map the spatiotemporal variations in surface deformation of RTSs in the Beiluhe region of the Tibetan Plateau by using 112 scenes of Sentinel-1 SAR data acquired from 2017 to 2021.The deformation rates of RTSs ranged from−35 to 20 mm/year,and three typical motion stages were inferred by analyzing the deformation variation trend of the headwall of RTSs:stable,abrupt thaw,and linear subsidence.A total of 375 RTSs were identifed in the Mati Hill region by combining InSAR-based deformation results with visual interpretation of optical remote sensing images.Among them,76 RTSs were newly developed,and 26%more than the inventory derived from the optical images alone.This study demonstrated that the combination of InSAR-derived deformation with optical images has signifcant potential for detecting RTSs with high accuracy and efciency at the regional scale.

关键词： Multi-temporal InSAR Permafrost thawing Qinghai-Tibet Plateau(QTP) Retrogressive thaw slump

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A breathing A4 paper by in situ growth of green metal-organic frameworks for air freshening and cleaning

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Chinese Journal of Chemical Engineering 2022年第12期52卷 95-102页

作者： Bo Zhang Hongwen Chen liming jiang Youqing Shen Dan Zhao Zhuxian Zhou Key Laboratory of Biomass Chemical Engineering of Ministry of Education and Zhejiang Key Laboratory of Smart Biomaterials College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China Department of Polymer Science and Engineering Zhejiang UniversityHangzhou 310027China Department of Chemical&Biomolecular Engineering National University of Singapore117585Singapore Hangzhou Global Scientific and Technological Innovation Center Zhejiang UniversityHangzhou 311215China

Surface modification of natural cellulose fibers with nanomaterials is an effective strategy for producing functional textiles for multiple applications.A4-sized printing paper is a commonly used,cheap,and easily acquirable office supply which is mainly made of cellulose fibers.Here,we report green and simple nanofabrication of A4 paper to endow it with high capability for fragrance encapsulation and sustained release,and strong adsorption to indoor air pollutants.The method utilizes the sugar molecule of cellulose for in-situ growth ofγ-cyclodextrin(γ-CD)metal-organic frameworks(MOFs)on A4 paper.The obtainedγ-CD-MOF/A4 nanocomposites have superior specific surface area and high porous structure.Theγ-CD-MOF/A4 nanocomposites can effectively encapsulate fragrant molecules through host-guest interaction.Theγ-CD-MOF/A4 nanocomposites also show strong absorption capability to formaldehyde and carbon dioxide through the formation of hydrogen bonding and chemical bonds.Theseγ-CD-MOF/A4nanocomposites combine the advantages of both A4 paper andγ-CD-MOF,which can be used in indoor air freshening and cleaning.

关键词： Metal-organic frameworks A4 printing paper In situ synthesis Fragrance encapsulation Formaldehyde removal Carbon dioxide capture

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GRACE-based estimates of groundwater variations over North America from 2002 to 2017

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Geodesy and Geodynamics 2022年第1期13卷 11-23页

作者： Hansheng Wang Longwei Xiang Holger Steffen Patrick Wu liming jiang Qiang Shen Zhen Li Masaki Hayashi State Key Laboratory of Geodesy and Earth's Dynamics Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430077China University of Chinese Academy of Sciences Beijing 100049China School of Geosciences Yangtze UniversityWuhan 430100China Lantmateriet 80182GavleSweden Department of Geoscience University of CalgaryCalgaryCanada

GRACE-based estimates for groundwater storage(GWS)changes in North America substantially depend upon correction of glacialisostatic adjustment(GIA)effects,which are usually removed with GIA models.In this study,GIA effects are eliminated by employing an independent separation approach with the aid of Global Navigation Satellite System(GNSS)vertical velocity data.Our goal is to provide an independent estimate for monthly GWS changes within North America in 1-degree-grids and their trends over the whole GRACE mission lifetime from April 2002 to June 2017.This estimate is derived from the release-6 version of GRACE monthly level-2 data,GNSS data,land surface models for soil moisture and snow wa-ter equivalent,and satellite altimetric lake leveldata.We find a GWS anomaly in form of an increasing trend in Saskatchewan,which affects the Saskatchewan Province and the states of Montana,North Dakota and Minnesota,and 4 GWS anomalies with declining trends in Nevada,California,Arizona and Texas,respec-tively.The monthly changes of these GWS anomalies,except for the one in Nevada,are validated by well level data.We provide results for average monthly GWS changes and the trends for the 5 anomalies but also in separate form for the 13 affected states or provinces.The increasing trends of the Saskatchewan GWS anomaly and the affected 3 states are related to increasing precipitation and can be elucidated by the decreasing drought intensity level.On the contrary,the declining trends in GWS can be explained by weakening precipitation and are mostly supported by the increasing drought intensity level in the other 4 anomalies and the affected states,which are Nevada,California,Arizona,New Mexico,Texas,Oklahoma,Kansas,and Colorado.Ourestimates of monthly GWS changes and their trendscan serveas alternativeand beneficial input for the sustainable management of groundwater resources in North America.

关键词： North America Gravity recovery and climate experiment (GRACE) GNSS Groundwater Precipitation Drought

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Causative fault and seismogenic mechanism of the 2010 Suining M5.0 earthquake from joint modeling of seismic and InSAR data

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Science China Earth Sciences 2023年第8期66卷 1825-1838页

作者： Wangwang GU Sidao NI Shuofan WANG Baolong ZHANG Xinglin LEI Risheng CHU Aizhi GUO Qiang SHEN Hansheng WANG liming jiang Minhan SHENG Jiajun CHONG State Key Laboratory of Geodesy and Earth’s Dynamics Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430077China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China Geological Survey of Japan National Institute of Advanced Industrial Science and Technology(AIST)Ibaraki 305-8567Japan

Although the Sichuan basin is a stable block with low historical seismicity,the Suining M5.0 earthquake on January31,2010 occurred near the center of the basin,causing casualty and substantial damage.Previous studies have shown that the earthquake is very shallow and may occur in the sedimentary cover rocks,but its causative fault has not been identified.Based on local broadband seismic waveform data as well as a pair of ALOS PALSAR ascending orbit data,we explore the seismogenic mechanism via further constraining the source depth and the ruptured fault.The earthquake caused ground uplift in the southeast of the epicenter area,with a maximum line of sight displacement of about 13.6 cm,much larger than the displacement caused by a M5 earthquake at a typical depth of 10 km,which indicates that the earthquake is very shallow.Through joint inversion of seismic waveform and InSAR data,we obtain the moment magnitude of Suining earthquake as MW4.5,with the strike,dip,and rake of its fault plane as 17°,66° and 90°,respectively,and the centroid depth less than 1 km,supporting that the earthquake occurred at the shallow part of a high angle thrust fault dipping to the southeast.It is further confirmed that the earthquake may be triggered by the diffusion of high-pressure fluid migrating from the underside gas reservoir.

关键词： Suining earthquake Seismogenic fault Source depth InSAR Seismic waveform Joint inversion

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High cycle fatigue failure with radial cracks in gears of aero-engines

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Chinese Journal of Aeronautics 2020年第10期33卷 2620-2632页

作者： Jie HONG liming jiang Xiru XU Yanhong MA School of Energy and Power Engineering Beihang UniversityBeijing 100083China Collaborative Innovation Center of Advanced Aero-Engine Beijing 100083China

The gears in aero-engines perform energy and motion transfer between the HighPressure Rotor(HPR)and accessories.Firstly,an occurred fault with radial cracks in the driven gear disk was diagnosed as High Cycle Fatigue(HCF)failure through necessary examinations.Analysis of fault tree and test signals indicated that the fracture was relevant to the swing vibration of the driven gear excited by the unbalance excitation on HPR.Secondly,a corresponding mechanism model was established,in which the gear meshing effect was considered,with lateral and swing vibration mode.The Governing Equations(GEs)and the Finite Element Model(FEM)were established and verified.Then,the modal shapes,harmonic response,and transient response were analyzed,indicating that the swing vibration of the driven gear could be significantly excited by the unbalance on HPR,which induced the cracks in the driven gear disk to extend radially.Furthermore,influences of factors on the unbalance response were obtained,in which the unbalance response appeared local minimum points and maximum points.Meanwhile,1#and 2#bearing stiffness had rather significant influences on the response.Thus it is efficient to modify them to achieve vibration control.

关键词： Cracks Fault analysis Geared rotors Influences of factors Response Unbalance

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Association between Low Ambient Temperature and the Severity of Acute Ischemic Stroke

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Journal of Clinical and Nursing Research 2024年第5期8卷 83-94页

作者： Xinyi Huang liming Shu Su Xiao Qiuhong jiang Shiliang Yang Hualiang Liang Hua Hong Liang Luo Department of Critical Care Medicine The Seventh Affiliated Hospital of Sun Yat-sen UniversityShenzhen 518107GuangdongChina Department of Neurology The Second Affiliated Hospital of Guangzhou Medical UniversityGuangzhou 510260GuangdongChina The Second Xiangya Hospital of Central South University Changsha 410011HunanChina Department of Neurology National Key Clinical Department and Key Discipline of NeurologyThe First Affiliated HospitalSun Yat-sen UniversityGuangzhou 510080GuangdongChina Department of General Practice Shenshan Central HospitalSun Yat-Sen Memorial HospitalSun Yat-Sen UniversityShanweiChina 516600GuangdongChina School of Public Health Sun Yat-sen UniversityGuangzhou 510080GuangdongChina

Objective:To explore the relationships among ambient temperature,ischemic stroke severity,and blood pressure.Methods:Meteorological data(2005–2015)were collected from the Guangzhou Meteorological Data Service.Ischemic stroke patients from the Department of Neurology of the First Affiliated Hospital,Sun Yat-sen University were retrospectively evaluated,each winter from 2005 to 2015.Patient demographics,baseline measurements,and National Institute of Health Stroke Scale(NIHSS)score were evaluated.Results:Three hundred sixty-two patients were included.The median latency from symptom onset to admission was 2 d(IQR:1–3 d).During recruitment,the highest and lowest temperatures were 39℃and 1.3℃,respectively.Hypertension was the most common comorbidity(75.1%).NIHSS scores at admission and discharge were higher in the cold-exposed group than in the controls regardless of the average temperature at admission.In addition,systolic and diastolic blood pressure values at admission were higher in the cold-exposed group than in the controls.When stratified by hypertensive status,the average and minimum temperatures at admission were negatively associated with systolic and diastolic blood pressure values in hypertensive patients.Reductions in the average and minimum temperatures at symptom onset were associated with more severe stroke.Conclusion:Ischemic stroke patients with symptom onset in winter had higher systolic blood pressure values and more serious neurologic deficits upon admission.

关键词： Low ambient temperature Stroke Blood pressure Severity

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掺混PODE对汽油–柴油双燃料发动机燃烧及碳烟生成特性研究

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工程热物理学报 2024年第3期45卷 915-924页

作者：蒋一王谦姜鹏戴礼明钟汶君姚嘉伟江苏大学能源与动力工程学院镇江212013

本文针对清洁燃料替代传统燃料,在光学发动机上,利用高速成像技术结合双色法采集了柴油掺混聚甲氧基二甲醚(PODE)-汽油反应活性控制压燃模式下的缸内燃烧特性及碳烟生成过程。试验结果表明:相同预混比下随着PODE的掺混增加,缸内压力峰... 详细信息

本文针对清洁燃料替代传统燃料,在光学发动机上,利用高速成像技术结合双色法采集了柴油掺混聚甲氧基二甲醚(PODE)-汽油反应活性控制压燃模式下的缸内燃烧特性及碳烟生成过程。试验结果表明:相同预混比下随着PODE的掺混增加,缸内压力峰值、放热率峰值、压力升高率都随之降低,着火延迟期延长,燃烧持续期增加,燃烧相位后移,燃烧趋于平缓。在预混比为50%时,直喷P20D80及P50D50的单循环燃烧总放热量分别为直喷P0D100总放热量的97.89%和95.39%,单循环碳烟生成总量分别为直喷P0D100的55.22%和36.55%,碳烟高温区域分别减少了52.9%和73.32%,碳烟平均温度的稳定值分别降低了6.65 K和20.25 K,碳烟平均KL因子的稳定值分别降低了10.35%和16.12%。相较而言P50D50作为直喷燃料既能保证较高燃烧热效率,又能有效抑制碳烟的生成。

关键词：反应活性控制压燃光学发动机碳烟温度 KL因子

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双轮支柱式起落架刹车振动分析与减振优化

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振动与冲击 2024年第5期43卷 328-337页

作者：蒋伟张明胡晓航朱鑫唐立明南京航空航天大学飞行器先进设计技术国防重点学科实验室南京210016 南京航空航天大学航空学院南京210016

以某型双轮支柱式起落架为研究对象,对飞机刹车诱导低频振动问题进行了研究,首先建立了完备的飞机着陆刹车滑跑整机六自由度数学模型,并在Simulnk中完成模型的搭建,用以分析了刹车控制律的部分参数对抖振的影响。其次,以轮轴中心航向加... 详细信息

以某型双轮支柱式起落架为研究对象,对飞机刹车诱导低频振动问题进行了研究,首先建立了完备的飞机着陆刹车滑跑整机六自由度数学模型,并在Simulnk中完成模型的搭建,用以分析了刹车控制律的部分参数对抖振的影响。其次,以轮轴中心航向加速度的RMS值作为振动量化指标,与结合系数效率一同设置为优化目标,基于NSGA-Ⅱ算法对液压刹车控制系统参数进行多目标优化设计,得到了优化变量的Parato最优前沿面和TOPSIS方法折衷最优解。最后,根据得到的优化设计方案对比分析优化前后的轮轴中心振动响应,并设置多组仿真工况检验了优化方案对不同着陆环境的适应性。结果显示优化后的起落架轮轴中心加速度Rms值最大降幅能达到14.53%,结合系数效率最大增幅为3.65%,表明所提出的起落架减振优化设计方法具有良好的实现性。

关键词：飞机刹车系统起落架抖振多目标遗传优化数学模型刹车诱导振动

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胫骨高位截骨促进软骨再生治疗膝骨关节炎

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中国组织工程研究 2024年第32期28卷 5243-5248页

作者：付强昌郑力铭蒋利锋浙江大学医学院附属第二医院骨科浙江省杭州市310052 浙江大学骨科研究所浙江省杭州市310052 浙江省运动系统疾病研究与精准诊治重点实验室浙江省杭州市310052 浙江省运动系统疾病临床研究中心浙江省杭州市310052

背景:对于全膝关节置换无法取得满意疗效的早期膝骨关节炎,胫骨高位截骨能促进受损软骨再生,缓解患者症状,是治疗膝骨关节炎的经典保膝治疗方案。目的:对胫骨高位截骨刺激膝骨关节炎软骨再生的有效性、作用机制及应用前景展开回顾与讨论... 详细信息

背景:对于全膝关节置换无法取得满意疗效的早期膝骨关节炎,胫骨高位截骨能促进受损软骨再生,缓解患者症状,是治疗膝骨关节炎的经典保膝治疗方案。目的:对胫骨高位截骨刺激膝骨关节炎软骨再生的有效性、作用机制及应用前景展开回顾与讨论,为利用胫骨高位截骨术联合软骨再生策略治疗膝骨关节炎提供理论基础。方法:计算机检索PubMed数据库、Web of Science、中国知网、万方医学数据库收录的相关文献。英文检索词为“knee osteoarthritis,high tibial osteotomy,limb alignment,chondrocytes,biomechanics,intra-articular”,中文检索词为“膝骨关节炎,胫骨高位截骨术,下肢力线,软骨细胞,生物力学,关节腔注射”,主要收集数据库中2013-2023年相关的文献,最终纳入75篇文献进行分析。结果与结论:①胫骨高位截骨纠正下肢力线能有效缓解患者的症状,延缓甚至避免全膝关节置换,是骨科阶梯化治疗的重要组成部分;②正常的力学微环境对软骨细胞的表型和功能维持是必须的,异常的力学信号可以通过初级纤毛、整合素、细胞骨架和核骨架成分等机械传感器转化为细胞内的化学信号,导致软骨基质代谢和炎症调控的紊乱;③异常应力作用后的软骨细胞在合适的应力下仍有恢复为正常表型的潜能,胫骨高位截骨术纠正力学微环境后可导致自发性软骨修复和滑膜炎症缓解;④对于尚不满足全膝关节置换的早期膝骨关节炎患者,胫骨高位截骨术联合软骨再生策略的前景值得期待。

关键词：膝骨关节炎胫骨高位截骨术下肢力线软骨再生炎症生物力学力学微环境关节腔注射

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考虑不确定性的周期性资源购买机制及多时间尺度调峰调度策略

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中国电机工程学报 2024年第11期44卷 4261-4272,I0007页

作者：姜婷玉陶劲宇王珂杨力铭赵健鞠平河海大学能源与电气学院江苏省南京市210098 云南省配售电有限公司云南省昆明市650000 国网南京供电公司江苏省南京市210098

合理的资源购买和有效的调度策略是充分利用需求响应资源向系统提供辅助服务的关键。该文针对电力系统运行中最常出现、影响也较大的辅助服务事件之一--调峰的需求响应资源周期性购买问题和日内调度问题进行研究。首先,对广大调峰事件... 详细信息

合理的资源购买和有效的调度策略是充分利用需求响应资源向系统提供辅助服务的关键。该文针对电力系统运行中最常出现、影响也较大的辅助服务事件之一--调峰的需求响应资源周期性购买问题和日内调度问题进行研究。首先,对广大调峰事件的调峰需求特征进行聚类,利用概率描述调度中心不同的决策行为,建立周期内调节资源购买的不确定性模型并获取最优调节资源购买量。其次,针对日内调度,结合负荷预测,建立基于滚动优化的多时间尺度能量和功率协调调度策略。大时间尺度上以调度中心调峰经济性最优为目标对调节能量进行分配,小时间尺度上以调峰效果最优为目标对调节功率进行分配。仿真结果表明,所提周期性资源购买决策机制能够有效提升周期内调度中心的平均收益;而日内多时间尺度协调的调峰策略则能够充分利用已购资源,实现调度中心调峰经济性和调峰效果的双赢。

关键词：调峰需求响应资源购买周期性规划多时间尺度规划

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