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25篇 您的检索式:作者名="Lingyun JI"
    题名 作者 年代 出处 被引量
1Monitoring mine collapse by D-InSAR显示文摘For harmful ground collapse and its special deformation characteristics,which causes SAR images to lose coherence,InSAR technology cannot be applied in monitoring surface collapse in mining areas.We took the Shenmu mining area in northern Shaanxi province as an example to study subsidence in mining areas and proposed an interpolated multi-view processing method.The results show that this method can improve the detectable deformation gradient to a certain extent and can become a good reference value for monitoring large scale gradient deformation.We also analyzed the rules for temporal decorrelation in mining.YANG Chengsheng ZHANG Qin ZHAO Chaoying JI Lingyun ZHU Wu 2010Mining Science and Technology2010,20,5:21
2Preliminary analysis on the source properties and seismogenic structure of the 2017 M_s7.0 Jiuzhaigou earthquake显示文摘At GMT time 13:19, August 8, 2017, an Ms7.0 earthquake struck the Jiuzhaigou region in Sichuan Province, China,causing severe damages and casualties. To investigate the source properties, seismogenic structures, and seismic hazards, we systematically analyzed the tectonic environment, crustal velocity structure in the source region, source parameters and rupture process, Coulomb failure stress changes, and 3-D features of the rupture plane of the Jiuzhaigou earthquake. Our results indicate the following:(1) The Jiuzhaigou earthquake occurred on an unmarked fault belonging to the transition zone of the east Kunlun fault system and is located northwest of the Huya fault.(2) Both the mainshock and aftershock rupture zones are located in a region where crustal seismic velocity changes dramatically. Southeast to the source region, shear wave velocity at the middle to lower crust is significantly low, but it rapidly increases northeastward and lies close to the background velocity across the rupture fault.(3) The aftershock zone is narrow and distributes along the northwest-southeast trend, and most aftershocks occur within a depth range of 5–20 km.(4) The focal mechanism of the Jiuzhaigou earthquake indicates a left-lateral strike-slip fault, with strike, dip, and rake angles of 152°, 74° and 8°, respectively. The hypocenter depth measures 20 km, whereas the centroid depth is about 6 km. The co-seismic rupture mainly concentrates at depths of 3–13 km, with a moment magnitude(M_w) of 6.5.(5) The co-seismic rupture also strengthens the Coulomb failure stress at the two ends of the rupture fault and the east segment of the Tazang fault. Aftershocks relocation results together with geological surveys indicate that the causative fault is a near vertical fault with notable spatial variations: dip angle varies within 66°–89° from northwest to southeast and the average dip angle measures ~84°. The results of this work are of fundamental importance for further studies on the source characteristics, tectonic environment, and seismic hazard evaluation of the Jiuzhaigou earthquake.Zujun XIE Yong ZHENG Huajian YAO Lihua FANG Yong ZHANG Chengli LIU Maomao WANG Bin SHAN Huiping ZHANG Junjie REN Lingyun JI Meiqin SONG 2018Science China Earth Sciences2018,61,3:8
3Present-day 3D deformation field of Northeast China,observed by GPS and leveling显示文摘A broad view of present-day 3D deformation field around the Northeast China region was derived from GPS and leveling observations.We draw the following conclusions:First,the Northeast China region moved towards northwest with an average velocity of 5 mm /a,with respect to South China.The entire Northeast China region was in a low strain state from the strain rate field.Second,we processed two periods of firstorder leveling data in 1970 s and 1990 s,showing the vertical deformation of the Northeast China region is'uplift in western part and subsidence in eastern part'.Ji Lingyun Wang Qingliang Wang Shuangxu 2014Geodesy and Geodynamics2014,5,3:6
4Three-dimensional crustal movement and the activities of earthquakes,volcanoes and faults in Hainan Island,China显示文摘Hainan Island is a seismic active region, where Qiongshan M7.5 earthquake occurred in 1605 and several seismic belts appeared in recent years, especially the NS trending seismic belt(NSB) located in the northeast part of the island. Here is also a magmatic active region.The lava from about 100 volcanoes covered more than 4000 km^2. The latest eruptions occurred on Ma'anlinge Lei Huling volcanoes within 10,000 years. The neotectonic movement has been determined by geological method in the island and its adjacent areas. In the paper, the present-day 3D crustal movement is obtained by using Global Positioning System(GPS) data observed from 2009 to 2014 and leveling observations measured in 1970s and 1990s respectively. The results show the horizontal movement is mainly along SEE direction relative to the Eurasian Plate. The velocities are between 4.01 and 6.70 mm/a. The tension rate near the NSB is less than 1 mm/a. The vertical movement shows the island uplifts as a whole with respect to the reference benchmark Xiuyinggang. The average uplifting rate is 2.4 mm/a. The rates are 2-3 mm/a in the northwest and 3-5mm/a in the northwest. It shows the deformation pattern of the southwest island is upward relative to the northeast, which is different from the result inferred from the coastal change and GPS.Haikou and its adjacent region present a subsidence in a long time. The southern part of the middle segment of the Wangwu-Wenjiao fault uplifts relative to the northern. Meanwhile, the western part uplifts relative to the eastern NSB. The vertical crustal motion and the two normal faults nearly correspond to the terrain. The NSB is located along the Puqiangang-Dazhibo fault, which is assessed as a segmented fault with a dip of 80°-90° and partly exposed. The 3D deformations and other studies reveal the present activities of earthquakes, volcanoes and the faults. The small earthquakes will still occur in the NS belt and the volcanoes are not active now.Yaxuan Hu Ming Hao Lingyun Ji Shangwu Song 2016Geodesy and Geodynamics2016,7,4:6
5Present-day crustal deformation around Kalpin block,Xinjiang,China,observed by InSAR显示文摘Due to the effect of the collision between the Indian plate and Eurasian plate,Pamirs is constantly moving to the north.Under the interaction among multiple tectonic blocks,strong earthquakes often occurred around the Kalpin block which is located in western Tianshan of Chinese continent.In this paper,we used Interferometric Synthetic Aperture Radar( InSAR) technique and adopted stacking algorithm to achieve the present-day crustal deformation field of the Kalpin block region based on 38 Envisat ASAR images.The results show that the deformation in radar line of sight around Kalpin block is mainly compressive between south and north with magnitude 1-1.5 mm /a.Displacement decreases gradually from northwest to southeast,which is consistent with the deformation characteristics shown in Tianshan,i.e.crust is gradually shortening from west to east detected by the GPS observations.Also,the Piqiang fault zone is uplifting.And there is an obvious displacement difference between the two sides of the Aozigeertawu fault.Liu Liwei Ji Lingyun Yang Xiaodong 2014Geodesy and Geodynamics2014,5,3:3
6A new die-cast magnesium alloy for applications at higher elevated temperatures of 200-300℃显示文摘The development of lightweight magnesium(Mg)alloys capable of operating at elevated temperatures of 200-300℃and the ability of using high pressure die casting for high-volume manufacturing are the most advanced developments in manufacturing critical parts for internal combustion engines used in power tools.Here we report the microstructure and mechanical properties of a newly developed die-cast Mg-RE(La,Ce,Nd,Gd)-Al alloy capable of working at higher elevated temperatures of 200-300℃.The new alloy delivers the yield strength of 94 MPa at 300℃,which demonstrates a 42%increase over the benchmark AE44 high temperature die-cast Mg alloy.The new alloy also has good stiffness at elevated temperatures with its modulus only decreasing linearly by 13%from room temperature up to 300℃.Thermal analysis shows a minor peak at 364.7℃in the specific heat curve of the new alloy,indicating a good phase stability of the alloy up to 300℃.Nd and Gd have more affinity to Al for the formation of the minority of divorced Al-RE(Nd,Gd)based compounds,and the stable Al-poor Mg_(12)RE(La_(0.22)Ce_(0.13)Nd_(0.31)Gd_(0.31))Zn_(0.39)Al_(0.13)compound acts as the continuous inter-dendritic network,which contribute to the high mechanical performance and stability of the new die-cast Mg alloy at 200-300℃.Xixi Dong Lingyun Feng Shihao Wang Eric A.Nyberg Shouxun Ji 2021Journal of Magnesium and Alloys2021,9,1:2
7Assessment of strong earthquake risk in the Chinese mainland from 2021 to 2030显示文摘The long-term earthquake prediction from 2021 to 2030 is carried out by researching the active tectonic block boundary zones in the Chinese mainland.Based on the strong earthquake recurrence model,the cumulative probability of each target fault in the next 10 years is given by the recurrence period and elapsed time of each fault,which are adopted from relevant studies such as seismological geology,geodesy,and historical earthquake records.Based on the long-term predictions of large earthquakes throughout the world,this paper proposes a comprehensive judgment scheme based on the fault segments with the seismic gap,motion strongly locked,sparse small-moderate earthquakes,and apparent Coulomb stress increase.This paper presents a comprehensive analysis of the relative risk for strong earthquakes that may occur in the coming 10 years on the major faults in the active tectonic block boundary zones in the Chinese mainland.The present loading rate of each fault is first constrained by geodetic observations;the cumulative displacement of each fault is then estimated by the elapsed time since the most recent strong earthquake.Zhigang Shao Yanqiang Wu Lingyun Ji Faqi Diao Fuqiang Shi Yujiang Li Feng Long Hui Zhang Wuxing Wang Wenxin Wei Peng Wang Xiaoxia Liu Qi Liu Zhengyang Pan Xiaofei Yin Yue Liu Wei Feng Zhenyu Zou Jia Cheng Renqi Lu Yueren Xu Xi Li 2023Earthquake Research Advances2023,3,1:2
8Local conformation transitions of linear DNA induced by cisplatin显示文摘Cisplatin is the most successful anti-tumor drug,and its pharmacological property is generally considered to derive from the modification of DNA molecules.Structural modifications of short DNA induced by cisplatin have already been investigated.However,the conformation transitions induced by cisplatin are not clear.In the present letter,we have studied the effect of low-concentration cisplatin on DNA conformation by using AFM imaging.We observed formations of micro-rod structures of linear DNA induced by cisplatin.A method is presented to quantitatively analyze the occurrence of micro-rod structures.We found that the formation of micro-rod structures depends on the DNA sequence.Based on the results,we proposed a physical mechanism to explain the local conformation transitions of DNA molecules under the influence of cisplatin.Chao Ji Lingyun Zhang Shuoxing Dou Pengye Wang 2014Chinese Science Bulletin2014,59,25:1
9Present-day deformation of Agung volcano,Indonesia, as determined using SBAS-InSAR显示文摘Based on ALOS PALSAR images,time series deformation fields of the Agung volcano area were obtained using SBAS-InSAR in 2007-2009.The time series deformation showed obvious inflation around the Agung volcano area,which was positively correlated with time.We modeled the cumulated deformation interferogram based on Mogi point source and vertical prolate spheroid source.The deformation model indicated that the vertical prolate spheroid model fit the observed deformation reasonably well.The magma chamber was located beneath the center of the volcano at a depth of approximately 5 km beneath the summit.Ji Lingyun Wang Qingliang Qin Shanlan 2013Geodesy and Geodynamics2013,4,3:1
10One feature of the activated southern Ordos block:the Ziwuling small earthquake cluster显示文摘Small earthquakes( Ms > 2.0) have been recorded from 1970 to the present day and reveal a significant difference in seismicity between the stable Ordos block and its active surrounding area.The southern Ordos block is a conspicuous small earthquake belt clustered and isolated along the NNW direction and extends to the inner stable Ordos block;no active fault can match this small earthquake cluster.In this paper,we analyze the dynamic mechanism of this small earthquake cluster based on the GPS velocity field( from 1999 to2007),which are mainly from Crustal Movement Observation Network of China( CMONOC) with respect to the north and south China blocks.The principal direction of strain rate field,the expansion ratefield,the maximum shear strain rate,and the rotation rate were constrained using the GPS velocity field.The results show that the velocity field,which is bounded by the small earthquake cluster from Tongchuan to Weinan,differs from the strain rate field,and the crustal deformation is left-lateral shear.This left-lateral shear belt not only spatially coincides with the Neo-tectonic belt in the Weihe Basin but also with the NNW small earthquake cluster( the Ziwuling small earthquake cluster).Based on these studies,we speculate that the NNW small earthquake cluster is caused by left-lateral shear slip,which is prone to strain accumulation.When the strain releases along the weak zone of structure,small earthquakes diffuse within its upper crust.The maximum principal compression stress direction changed from NE-SW to NEE-SWW,and the former reverse faults in the southwestern margin of the Ordos block became a left-lateral strike slip due to readjustment of the tectonic stress field after the middle Pleistocene.The NNW Neo-tectonic belt in the Weihe Basin,the different movement character of the inner Weihe Basin( which was demonstrated through GPS measurements) and the small earthquake cluster belt reflect the activated southern margin of the Ordos block,which was generated through readjustment of the tectonic stress field after the middle Pleistocene.Li Yuhang Wang Qingliang Cui Duxin Hao Ming Ji Lingyun Qin Shanlan 2014Geodesy and Geodynamics2014,5,3:1
11A Comparative Study on Pb Tolerance and Enrichment Characteristics among Different Species of Compositae显示文摘In order to find landscape plants purifying Pb pollution of soil,a pot experiment was conducted to study Pb resistance and enrichment characteristics of six species of Compositae plants( Aster ageratoides,Rudbeckia hirta,Cosmos sulphureus,Gynura bicolor,Calendula officinalis,Bidens pilosa) in different soil Pb concentrations. The results showed that the dry weight of aboveground part in the six plants decreased with the increase of soil Pb concentration. The tolerance index( TI) of C. sulphureus,G. bicolor and C. officinalis was greater than 0. 5 in all concentrations,and the root tolerance index( RTI) was greater than 0. 9,which were better resistant to Pb stress. The maximum Pb content in aboveground part of R. hirta was 1 783 mg/kg,and the enrichment and transport coefficients were all greater than 1. When the soil Pb concentration was 500 mg/kg,the total Pb accumulation in the aboveground part of R. hirta was 2. 507 mg/plant. Finally based on the integrated observation of the enrichment coefficient,transport factor and repair potential index,it believed that R. hirta can be used to restore Pb contaminated soil at low concentration.Xuan Bin Wang Ji Zhang Lingyun Cai Xiongfei Hu Fengqing Duan Zhibin Li Ding 2019Meteorological and Environmental Research2019,10,2:1
12Baseline 18F-FDG PET/CT Parameters as Imaging Biomarkers of Overall Survival in Castrate-Resistant Metastatic Prostate Cancer显示文摘Hossein Jadvar Bhushan Desai Lingyun Ji Peter S. Conti Tanya B. Dorff Susan G. Groshen Jacek K. Pinski David I. Quinn 2013Journal of Nuclear Medicine2013,,8:1
13The relief of hypoxic microenvironment using an O_(2) self-sufficient fluorinated nanoplatform for enhanced photodynamic eradication of bacterial biofilms显示文摘Hypoxia,an important characteristic of bacterial biofilms,can hinder the generation of reactive oxygen species(ROS)in photodynamic therapy(PDT),leading to reduced therapeutic efficacy of PDT.In order to address this issue,fluorinated liposome was fabricated as an oxygen-sufficient nanoplatform for enhanced photodynamic eradication of bacterial biofilms.The liposomes(denoted as Lip-Ce6-PFH@O_(2))were prepared by co-encapsulation of O_(2) carrier perfluorohexane(PFH)and photosensitizer chlorin e6(Ce_(6)).Lip-Ce6-PFH@O_(2) could achieve efficient biofilm penetration due to the positively charged surface.The hypoxic microenvironment of biofilms would then be relieved,leading to the generation of more ROS under laser irradiation.Therefore,the bactericidal capability of PDT could be significantly improved because of the co-delivered O_(2) carrier PFH.Lip-Ce6-PFH@O_(2) exhibited much better antibiofilm ability than that of Lip-Ce6 both in vitro and in vivo.Meanwhile,Lip-Ce6-PFH@O_(2) also effectively alleviated inflammation symptoms and accelerated wound healing in the mice model.In general,this study provides a new paradigm to enhance the therapeutic efficacy of PDT for efficient biofilm eradication.Lingyun Zou Dengfeng Hu Fanjin Wang Qiao Jin Jian Ji 2022Nano Research2022,15,2:0
14Microcolin H, a novel autophagy inducer, exerts potent antitumour activity by targeting PITPα/β显示文摘The identification of effective drug targets and the development of bioactive molecules are areas of high need in cancer therapy.The phosphatidylinositol transfer protein alpha/beta isoform(PITPα/β)has been reported to play an essential role in integrating phosphoinositide trafficking and lipid metabolism in diverse cellular processes but remains unexplored as a potential target for cancer treatment.Herein,data analysis of clinical cancer samples revealed that PITPα/βexpression is closely correlated with the poor prognosis.Target identification by chemical proteomic methods revealed that microcolin H,a naturally occurring marine lipopeptide,directly binds PITPα/βand displays antiproliferative activity on different types of tumour cell lines.Furthermore,we identified that microcolin H treatment increased the conversion of LC3I to LC3II,accompanied by a reduction of the level of p62 in cancer cells,leading to autophagic cell death.Moreover,microcolin H showed preeminent antitumour efficacy in nude mouse subcutaneous tumour models with low toxicity.Our discoveries revealed that by targeting PITPα/β,microcolin H induced autophagic cell death in tumours with efficient anti-proliferating activity,which sheds light on PITPα/βas a promising therapeutic target for cancer treatment.Hange Yang Xiaowei Zhang Cong Wang Hailong Zhang Juan Yi Kun Wang Yanzhe Hou Peihong Ji Xiaojie Jin Chenghao Li Min Zhang Shan Huang Haoyuan Jia Kuan Hu Lingyun Mou Rui Wang 2023Signal Transduction and Targeted Therapy2023,8,12:0
15Regional fault deformation characteristics before and after the Menyuan Ms6.4 earthquake显示文摘This study analyzes data regarding cross-fault deformations within the seismogenic zone of the 2016 Qinghai Menyuan Ms6.4 earthquake and its surrounding area. The results showed that the tendency anomaly sites near the epicenter had relatively long anomaly durations prior to the earthquake, while sudden-jumping anomaly sites started to increase in the middle eastern Qilian Mountains approximately a year before the earthquake and continued to increase and migrate towards the vicinity of the epicenter two to six months before the earthquake. Intensive observations a few days after the earthquake indicated that abnormal returns and turns before the earthquake were significant, but all had small amplitudes, and the coseismic effect was generally minor. In addition, the post-seismic tendency analysis of individual cross faults in the Qilian Mountain fault zone revealed an accelerating thrust tendency at all cross-fault sites in the middle Qilian Mountains after the 2008 Wenchuan Ms8.0 earthquake. This indicates that the Wenchuan mega-earthquake exerted a great impact on the dynamic environment of the northeastern margin of the Qinghai-Tibet plate and significantly enhanced the extrusion effect of the Indian plate on the middle Qilian Mountains, generating favorable conditions for the occurrence of Menyuan thrust earthquakes.Ning Li Lingyun Ji Shuangxu Wang 2016Geodesy and Geodynamics2016,7,4:0
16The June 2022 Khost earthquake in southeastern Afghanistan:A complicated shallow slip event revealed with InSAR显示文摘On June 22,2022,the Mw6.2 earthquake in southeastern Afghanistan caused a severe disaster.We used the Sentinel-1A ascending and descending track images of the European Space Agency and interferometric synthetic aperture radar(In SAR)to obtain the coseismic surface deformation field of the earthquake,which showed that the earthquake caused complex ruptures of multiple faults and various types.Using the dislocation model of the elastic half-space,we determined the focal parameters and slip distribution on the fault plane of this event.The results reveal that:(1)the seismogenic fault of this event is an unknown fault on the northeastern edge of the Katawaz microblock;(2)The slip on the fault plane is mainly in the range of 0—8 km along the dip,with maximum slips about 2 m at a depth of 2 km,which projected on the surface is 69.44°E,32.96°N.This event suggests that,similar to the Chaman,Ghazaband and other large faults,the faults inside the microblock also play an important role in adjusting for the collision stress between India and Europe.Jiangtao Qiu Lingyun Ji Liangyu Zhu Chuanjin Liu Jinshuo Wang 2023Geodesy and Geodynamics2023,14,6:0
17Mechanism of deformation around northern Hejin,China,observed by InSAR显示文摘Interferometric synthetic aperture radar(InSAR)images reveal deformation around northern Hejin,Shanxi Province.The small baseline subset(SBAS)approach for InSAR-derived deformation indicates that the observed deformation pattern can be characterized by the sum of two phenomena:background subsidence from December 2003 to February 2009 with a cumulative displacement of approximately 5 cm and uplift from February 2009 to November 2010 with a cumulative displacement of approximately 2.5 cm.Deformation modeling indicates that the local deformation was caused by the closing and opening of a sill beneath northern Hejin.The modeled sill which is approximately 5 km long,2 km wide,is centered at 1.5 km depth.The deformation was caused by the withdrawal and influx of subsurface water.Ji Lingyun Liu Liwei Li Ning Liu Ruichun Zhou Cong 2013Geodesy and Geodynamics2013,4,4:0
18Vertical deformation of the fault-crossing network around Baotou,observed by GPS显示文摘GPS data and precise leveling data of seismic network profiles across the fault in Baotou in 2006,2009 and 2011 were processed and analyzed to test the feasibility of using GPS technology for fault-crossing vertical deformation monitoring.The results showed that high precision cross-fault vertical deformation measurements can be obtained using appropriate GPS data processing strategies.Qin Shanlan Du Weiji Ji Lingyun 2013Geodesy and Geodynamics2013,4,4:0
19The NE Directed Seismicity Belt in Tibet after the M_S8.1 Nepal Earthquake and Its Predictive Significance显示文摘After the 2015 M_S8. 1 Nepal earthquake,a strong and moderate seismicity belt has formed in Tibet gradually spreading along the northeast direction. In this paper,we attempt to summarize the features and investigate the primary mechanism of this behavior of seismic activity,using a 2-D finite element numerical model with tectonic dynamic settings and GPS horizontal displacements as the constraints. In addition,compared with the NEtrending seismicity belt triggered by the 1996 Xiatongmoin earthquake,we discuss the future earthquake hazard in and around Tibet. Our results show that: the NE-directed seismicity belt is the response of enhanced loading on the anisotropic Qinghai-Tibetan plateau from the Indian plate and earthquake thrusting. Also,this possibly implies that a forthcoming strong earthquake may fill in the gaps in the NE-directed seismicity belt or enhance the seismic hazard in the eastern( the north-south seismic zone) and western( Tianshan tectonic region) parts near the NE-directed belt.Wang Shuangxu Zhu Liangyu Xu Jing Ji Lingyun Jiang Fengyun 2018Earthquake Research in China2018,32,1:0
20Finite element simulation of stress change for the M_(S)7.4 Madoi earthquake and implications for regional seismic hazards显示文摘On May 22,2021,the M_(S)7.4 earthquake occurred in Madoi County,Qinghai Province;it was another strong event that occurred within the Bayan Har block after the Dari M_(S)7.7 earthquake in 1947.An earthquake is bound to cast stress to the surrounding faults,thus affecting the regional seismic hazard.To understand these issues,a three-dimensional viscoelastic finite element model of the eastern Bayan Har block and its adjacent areas was constructed.Based on the co-seismic rupture model of the Madoi earthquake,we analyzed the co-and postseismic Coulomb stress change caused by the Madoi earthquake on the surrounding major faults.The results show that the Madoi earthquake caused significant co-seismic stress increases in the Tuosuo Lake and Maqin-Maqu segments of the East Kunlun fault(>10 kPa),which exceeded the proposed threshold of stress triggering.By integrating the accumulation rate of the inter-seismic tectonic stress,we conclude that the Madoi earthquake caused future strong earthquakes in the Tuosuo Lake and Maqin-Maqu segments of the East Kunlun fault to advance by 55.6-623 and 24.7-123 a,respectively.Combined with the influence of the Madoi earthquake and the elapsed time of the last strong earthquake,these two segments have approached or even exceeded the recurrence interval of the fault prescribed by previous research.In the future,it is necessary to focus greater attention on the seismic hazard of the Maqin-Maqu and Tuosuo Lake segments.This study provides a mechanical reference to understand the seismic hazard of the East Kunlun fault in the future,particularly to determine the seismic potential region.Lei Liu Yujiang Li Lingyun Ji Liangyu Zhu 2022Earthquake Research Advances2022,2,2:0
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