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| 1 | NbMoTiVSi_(x) refractory high entropy alloys strengthened by forming BCC phase and silicide eutectic structure显示文摘In order to improve mechanical properties of refractory high entropy alloys,silicide was introduced and NbMoTiVSi_(x)(x=0,0.1,0.2,0.3,and 0.4,molar ratio) refractory high entropy alloys are prepared by vacuum arc melting.Phase composition,micro structure evolution and mechanical properties were systematically studied.Results show that the silicide phase is formed in the alloys with addition of silicon,and the volume fraction of silicide increases from 0 to 8.3 % with increasing of silicon.Microstructure observation shows that the morphology of dendrite changes from columnar to near equiaxed,eutectic structure is formed at grain boundaries and composed of secondary BCC phase and silicide phase.The average length of the primary and second dendrites decreases with the increasing of silicon.Whereas,the ratio of eutectic structure increases from 0 to 19.8 % with the increment of silicon.The refinement of microstructure is caused by heterogeneous nucleation from the silicide.Compressive tests show that the yield and ultimate strength of the alloys increases from 1141.5 MPa to 2093.1 MPa and from 1700.1 MPa to 2374.7 MPa with increasing silicon content.The fracture strain decreases from 24.7 %-11.0 %.Fracture mechanism is changed from ductile fracture to ductile and brittle mixed fracture.The improvement of the strength is caused by grain bounda ry strengthening,which includes more boundaries around primary BCC phase and eutectic structure in grain boundary,both of them is resulted from the formation of silicide. | Qin Xu Dezhi Chen Chongyang Tan Xiaoqin Bi Qi Wang Hongzhi Cui Shuyan Zhang Ruirun Chen | 2021 | Journal of Materials Science & Technology2021，，1： | 9 |
| 2 | Detection of a half-microgal coseismic gravity change after the Ms7. 0 Lushan earthquake显示文摘Because only a small near-field coseismic gravity change signal remains after removal of noise from the accuracy of observations and the time and spatial resolution of the earth's surface gravity observation system,it is difficult to verify simulations of dislocation theory.In this study,it is shown that the GS15 gravimeter,located 99.5 km from the epicenter of the Ms7.0 Lushan earthquake on April 20,2013 at 08∶04 UTC+8,showed the influence of the earthquake from 2013-04-16 to 2013-04-26 after a time calibration,tide corrections,drift correction,period correction and relaxation correction were applied to its data.The post-seismic relaxation process of the spring in the gravimeter took approximately 430 minutes and showed a 2.5×10-8ms-2gravity change.After correcting for the relaxation process,it is shown that a coseismic gravity change of approximately+0.59±0.4×10-8ms-2was observed by the GS15 gravimeter;this agrees with the simulated gravity change of approximately 0.31×10-8ms-2.The rate of the coseismic gravity change and the coseismic vertical displacement,as measured by one-second and one-day sampling interval GPS units,is also consistent with the theoretical rate of change.Therefore,the GS15 gravimeter at the Pixian Station observed a coseismic gravity change after the Ms7.0 Lushan earthquake.This and similar measurements could be applied to test and confirm the theory used for these simulations. | Wei Jin Zhao Bin Tan Hongbo Yu Dan Shen Chongyang Li Hui | 2013 | Geodesy and Geodynamics2013，4，3： | 7 |
| 3 | Estimating Moho basement and faults using gravity inversion in Yushu-earthquake area,China显示文摘A gravity survey was conducted one month after the 2010 Yushu earthquake in the epicenter area.The cross-fault survey line was 500 km long,from Langqian county to Qingshuihe county,in a transition zone between Bayan Har block and Qiangtang block,in an area of high elevation,large undulating terrain,and complex geological features.An interpretation of the data was carried out together with other kinds of data,such as seismic exploration and magnetic exploration.The result shows that gravity is sensitive to fault boundary;the geologic structure of the region is complex at middle and upper depths,and the density profile reveals an eastward-pushing fault movement. | Yang Guangliang | 2012 | Geodesy and Geodynamics2012，3，2： | 4 |
| 4 | Gravity distribution characteristics and their relationship with the distribution of earthquakes and tectonic units in the Northe South seismic belt, China显示文摘The Northe South Seismic Belt(NSSB) is a Chinese tectonic boundary with a very complex structure, showing a sharp change in several geophysical field characteristics. To study these characteristics and their relationship with the distribution of earthquakes and faults in the study area, we first analyze the spatial gravity anomaly to achieve the Bouguer gravity anomaly(EGM2008 BGA) and the regional gravity survey Bouguer gravity anomaly.Next, we ascertain the Moho depth and crustal thickness of the study area using interface inversion with the control points derived from the seismic and magnetotelluric sounding profiles achieved in recent years. In this paper, we summarize the relief, trend, Moho gradient, and crustal nature, in addition to their relationship with the distribution of earthquakes and faults in the study area. The findings show that earthquakes with magnitudes greater than Ms7.0 are mainly distributed in the Moho Bouguer anomaly variation belt and faults. The results of the study are important for future research on tectonic characteristics, geological and geophysical surveys, and seismicity patterns. | Wu Guiju Tan Hongbo Zou Zhengbo Yang Guangliang Shen Chongyang | 2015 | Geodesy and Geodynamics2015，6，3： | 4 |
| 5 | Simulation of coseismic effects of the Ms7. 0 Lushan earthquake显示文摘Using plane dislocation theory and the seismic-wave inversion results from the Institute of Geophysics,China Earthquake Administration and the Institute of Geodesy and Geophysics,Chinese Academy of Sciences models,the surface coseismic deformation and gravity changes caused by the 2013 Ms7.0 Lushan earthquake are simulated.The simulations of coseismic gravity change and deformation indicate that the dislocation has dip-slip characteristics.The results also show that the coseismic deformation exhibits a symmetrical,positive-and-negative distribution,with the deformation usually being less than 10 mm in the farfield but up to 140 mm in the near-field.The gravity changes are concentrated on the fault-projection area,which is greatly affected by the vertical surface deformation.The gravity change and vertical deformation in the far field are usually less than and 5 mm,respectively,but reach and 330 mm,respectively,in the near field.The simulated results agree well with the measured results,which suggests a theoretical basis for the observed change in gravity before and after this earthquake. | Tan Hongbo Shen Chongyang Wei Jin Zhao Bin Wang Jian Xuan Songbai | 2013 | Geodesy and Geodynamics2013，4，3： | 3 |
| 6 | Temporal gravity changes before the 2008 Yutian Ms7.3 earthquake显示文摘Based on the data of the repeated gravity observation network in Chinese mainland since 1998,we analyzed the temporal changes of regional gravity field before the 2008 Yutian Ms7.3 earthquake.The result shows some mid-to-long term(two to ten years)changes during the earthquake's preparation.Notable features are a gravity increase lasting several years and a relatively large-scaled gradient zone of gravity change,the former indicating a continuous energy accumulation and the latter a possible location of seismic rupture.These gravity changes showed a trend of increase-accelerated increase-decelerated increase,similar to that of the Tangshan Ms7.8 earthquake in 1976.The maximum accumulated gravity change related to the earthquake reached 200×10-8 ms-2. | Shen Chongyang Li Hui Sun Shaoan Yang Guangliang Xuan Songbai Tan Hongbo Liu Shaoming | 2012 | Geodesy and Geodynamics2012，3，1： | 3 |
| 7 | Joint inversion of gravity and seismic data along a profile across the seismogenic fault of 2010 Yushu Ms7. 1 earthquake显示文摘Yushu Ms7. 1 earthquake occurred on the Ganzi-Yushu fault zone,across which we carried out a joint relative-gravity and seismic-reflection survey,and then performed a gravity inversion constrained by the seismic-reflection result. Based on the data of complete Bouguer gravity anomaly and seismic reflection,we obtained a layered interface structure in deep crust down to Moho. Our study showed that the inversion could reveal the interfaces of strata along the survey profile and the directions of regional faults in two-dimension. From the characteristics of the observed topography of the Moho basement,we tentatively confirmed that the uplift of eastern edge of Qinghai-Tibet plateau was caused by the subduction of the Indian plate. | Yang Guangliang Wang Fuyun Shen Chongyang Sun Shaoan Tan Hongbo | 2011 | Geodesy and Geodynamics2011，2，4： | 2 |
| 8 | Simulation of co-seismic gravity change and deformation of Wenchuan Ms8.0 earthquake显示文摘co 地震的严肃变化和排水量由 Wenchuan Ms8 引起了的表面。分别地, 0 地震由地球物理, CEA 和 USGS 的研究所根据一半空间脱臼理论和二差错模型 inversed 是计算的。结果显示出那 1 )脱臼由剧降组成滑倒并且权利侧面的罢工滑倒; 2 )co地震的严肃变化证明一个四象限的模式,哪个是极大地由垂直排水量的分发控制了,吗在特别近文件; 3 )严肃变化通常是不到 10 汦潯敤?楷桴? | Chongyang Shen Hui Li Hongbo Tan | 2010 | Geodesy and Geodynamics2010，1，1： | 2 |
| 9 | Research on the relationship between geophysical structural features and earthquakes in Mid-Yunnan and the surrounding area显示文摘In this study,we analyzed the gravity and,magnetic characteristics,and the occurrence of a fault zone and discussed the relationships between the two locations.The results reveal that the subsurface structures strikes are different compared with those in the research region.In other words,the geophysical advantageous directions from the gravity and magnetic anomalies are not the same as those caused by the surface structures.The local horizontal gradient results from the gravity and magnetic anomalies show that the majority of earthquakes occur along an intense fault zone,which is a zone of abrupt gravity and negative magnetic change,where the shapes match very well.From the distribution of earthquakes in this area,we find that it has experienced more than 11 earthquake events with magnitude larger than Ms7.0.In addition,water development sites such as Jinshajiang,Lancangjiang,and the Red River and Pearl River watersheds have been hit ten times by earthquakes of this magnitude.It is observed that strong earthquakes occur frequently in the Holocene active fault zone. | Wu Guiju Tan Hongbo Yang Guangliang Shen Chongyang | 2015 | Geodesy and Geodynamics2015，6，5： | 1 |
| 10 | Wenchuan Ms8.0 earthquake coseismic slip distribution inversion显示文摘By using GPS and gravity data before and after the Wenchuan Ms8.0 earthquake and combining data from geological surveys and geophysical inversion studies, an initial coseismic fault model is constructed. The dip angle changes of the fault slip distribution on the fault plane are inversed, and the inversion results show that the shape of the fault resembles a double-shovel. The Yingxiue Beichuan Fault is approximately 330 km long, the surface fault dip angle is 65.1, which gradually reduces with increasing depth to 0 at the detachment layer at a depth of 19.62 km. The Guanxiane Jiangyou Fault is approximately90 km long, and its dip angle at the surface is 55.3, which gradually reduces with increasing depth; the fault joins the Yingxiue Beichuan Fault at 13.75 km. Coseismic slip mainly occurs above a depth of 19 km. There are five concentrated rupture areas, Yingxiu,Wenchuan, Hanwang, Beichuan, and Pingwu, which are consistent with geological survey results and analyses of the aftershock distribution. The rupture mainly has a thrust component with a small dextral strikeeslip component. The maximum slip was more than10 m, which occurred near Beichuan and Hanwang. The seismic moment is 7.84 1020 Nm(Mw7.9), which is consistent with the seismological results. | Tan Hongbo Wu Guiju Xuan Songbai Yang Guangliang Fan Wenhua Shen Chongyang | 2015 | Geodesy and Geodynamics2015，6，3： | 1 |
| 11 | Gravity anomaly and crustal density structure in Jilantai rift zone and its adjacent region显示文摘This paper deals with the interpretation of Bouguer gravity anomalies measured along a 250 km long Suhaitu-Etuokeqi gravity profile located at the transitional zone of the Alxa and Ordos blocks where geophysical characteristics are very complex. The analysis is carried out in terms of the ratio of elevation and Bouguer gravity anomaly, the normalized full gradient of a section of the Bouguer gravity anomaly(Gh) and the crustal density structure reveal that(1) the ratio of highs and lows of elevation and Bouguer gravity anomaly is large between Zhengyiguan fault(F4) and Helandonglu fault(F6), which can be explained due to crustal inhomogeneities related to the uplift of the Qinghai-Tibet block in the northeast;(2)the main active faults correspond to the Ghcontour strip or cut the local region, and generally show strong deformation characteristics, for example the Bayanwulashan mountain front fault(F1) or the southeast boundary of Alxa block is in accord with the western change belt of Gh, a belt about10 km wide that extends to about 30 km;(3) YinchuanPingluo fault(F8) is the seismogenic structure of the Pingluo M earthquake, and its focal depth is about 15 km;(4)the Moho depth trend and Bouguer gravity anomaly variation indicates that the regional gravity field is strongly correlated with the Moho discontinuity. | Guiju Wu Chongyang Shen Hongbo Tan Guangliang Yang | 2016 | Earthquake Science2016，29，4： | 1 |
| 12 | Isostatic anomaly characteristics and tectonism of the New Britain Trench and neighboring Papua New Guinea显示文摘In this paper, we calculated Bouguer gravity anomalies and Airy-Heiskanen isostatic anomalies in the New Britain Trench and surrounding areas of Papua New Guinea. The calculations are based on a topographic model and a gravity anomaly model from the Scripps Institute of Oceanography. Characteristics of the isostatic anomaly and the earthquake dynamic environment of this region are analyzed,and the results show that there are obvious differences in the isostatic state between each block in the region. Tectonic movements are very intense in regions with high positive or negative isostatic gravity anomalies, and a number of sub-plates in this area are driven by external tectonic action, such as plate subduction and thrusting, of the Pacific, Indo-Australian and Eurasian plates. From the distribution of the isostatic gravity anomaly, the tectonic action of anti-isostatic movement obviously is the main source of power. Based on isostatic gravity and spatial distribution of earthquakes in the region, it is obvious that further contraction of the Indo-Australian Plate will result in the southwestern part of the Solomon Plate becoming part of the Owen Stanley thrust belt, and the northern part will enter the lower part of the Bismarck Plate. The eastern part of the Solomon Plate will enter the front of the Pacific Plate, resulting in northward and eastward migration of significant earthquakes along the Solomon Plate. | Guangliang Yang Chongyang Shen Jiapei Wang Songbai Xuan Guiju Wu Hongbo Tan | 2018 | Geodesy and Geodynamics2018，9，5： | 1 |
| 13 | Dynamic changes of gravity fields before and after the 2008 Wenchuan earthquake(Ms8.0)显示文摘The pattern evolution and dynamic mechanism of the dynamic changes of regional gravity fields occurring before and after the Wenchuan Ms8.0 earthquake are analyzed,based on five epochs of 1998-2007 mobile gravity data from the middle-south section of the north-south seismic belt,and two epochs of field research data collected after the 2008 Wenchuan earthquake in combination with GPS data,leveling observations,and geotectonic environment data.The regional dynamic gravity changes demonstrate the effects of the eastward flow of solid matter in the Qinghai-Tibetan plateau and the preparation of the 2008 Wenchuan earthquake(2-10 yr).The two most meaningful gravity indicators of the Wenchuan earthquake preparation are the positive(increasing) gravity changes occurring over many years in the southwest epicenter and the largescale gradient zone of gravity variation,with the cumulative difference between the two sides of the gradient zone of gravity exceeding 200 μGal.The positive gravity changes may facilitate a constant energy accumulation and the gradient belt may support seismic shear breakage.Overall,the gravity changes associated with the earthquake preparation indicate a pattern of accelerating increase-decelerating increase-earthquake occurrence.The Songpan-Ganzi block generally displays a negative gravity change,providing evidence for a local upwarping of the deep crust-mantle and an interior expansion of the deep crust attributable to high temperatures.The viewpoint is consistent with the dilatant mechanism for earthquake preparation. | Shen Chongyang Li Hui Sun Wenke Huang Jinshui Sun Shaoan Xuan Songbai Tan Hongbo Liu Shaoming | 2012 | Geodesy and Geodynamics2012，3，3： | 1 |
| 14 | Evaluation of global ocean tide models based on tidal gravity observations in China显示文摘Previous studies show that the calculated loading effects from global ocean tide models do not match actual measurements of gravity attraction and loading effects in Southeast Asia.In this paper,taking advantage of a unique network of gravity tidal stations all over the Chinese mainland,we compare the observed and modeled tidal loading effects on the basis of the most recent global ocean tide models.The results show that the average efficiencies of the ocean tidal loading correction for O_(1),K_(1),M_(2) are 77%,7 s3%and 59%,respectively.The loading correction efficiencies using recent ocean tidal models are better than the 40 years old Schwiderskis model at coastal stations,but relative worse at stations far from ocean. | Hongbo Tan Olivier Francis Guiju Wu Guangliang Yang Jiapei Wang Xiaotong Zhang Jinshui Huang Chongyang Shen | 2021 | Geodesy and Geodynamics2021，12，6： | 0 |
| 15 | Coseismic Effect Simulation of Yushu M_S 7.1 Earthquake and Absolute Gravity Inspection显示文摘Using the results of aftershock relocation,inversion on seismic waves and InSAR results,and surface rupture displacements obtained by geological survey after the earthquake,this paper constructs a fault model of the Yushu M S7.1 earthquake.Based on rectangular dislocation theory in an elastic-viscoelastic layered medium,we have simulated the coseismic deformation and gravity change with gravitational effect considered.The pictures show that the absolute gravity measuring point is beside the extremum of coseismic gravity change,and the numerical value reaches 25.02×10-8m·s-2.After a discussion about the gravity changes before the earthquake and the coherence consistency between two FG-5absolute gravimeters,we think that the measured value 27.2×10-8m·s-2at Yushu station is coseismic gravity change.It's coincident with the simulation results based on dislocation theory.Therefore it is a good tool to test the near-field changes found by dislocation theory. | Tan Hongbo Shen Chongyang Xing Leling Li Hui Chen Shi | 2013 | Earthquake Research in China2013，27，4： | 0 |
| 16 | A Robotic System with Robust Remote Center of Motion Constraint for Endometrial Regeneration Surgery显示文摘Surgical robots have been widely used in diferent procedures to improve and facilitate the surgery.However,there is no robot designed for endometrial regeneration surgery,which is a new therapy for restoring fertility in women using stem cells.Endometrial regeneration surgery requires processing of the endometrium and transplantation of stem cells with minimal trauma to the uterus.In this paper,we introduce a surgical robotic system that consists of a dexterous hysteroscope,supporting arm,and additional novel instruments to facilitate the operation and decrease trauma to the uterus.Remote center of motion(RCM)constraint is required to protect the cervix of the uterus.First,the supporting arm and hysteroscope are controlled separately in kinematics to ensure that the RCM constraint and hysteroscope’s shape and posture are predictable.Then,a task-decoupled method is used to improve the robustness of the RCM constraint.Experiments confrm that the proposed method is more robust and achieves higher RCM accuracy.In addition,the master-slave control of a robot with RCM constraint is also verifed.This study proposes the realization of a robot with robust RCM control for endometrial regeneration surgery. | Jianhua Li Chongyang Wang Zhenxing Wang Xiong Zheng Zhidong Wang Jichun Tan Hao Liu | 2022 | Chinese Journal of Mechanical Engineering2022，35，4： | 0 |
| 17 | Influence of crustal layering and thickness on co-seismic effects of Wenchuan earthquake显示文摘Using the PSGRN/PSCMP software and the fault model offered by USGS and on the basis of finite rectangular dislocation theory and the local layered wave velocity structures of the crust-upper-mantle, the influences of crustal layering and thickness on co-seismic gravity changes and deformation of Wenchuan earthquake have been simulated. The results indicate that: the influences have a relationship with the attitude of faults and the relative position between calculated points and fault. The difference distribution form of simulated results between the two models is similar to that of co-seismic effect. For the per centum distribution, it's restricted by the zero line of the co-seismic effects obviously. Its positive is far away from the zero line. For the crustal thickness, the effect is about 10%-20%. The negative and the effect over 30% focus around the zero line. The average influences of crustal layering and thickness for the E-W displacement, N-S displacement, vertical displacement and gravity changes are 18.4%,18.0%,15.8% and 16.2% respectively,When the crustal thickness is 40 km, they are 4.6%,5.3%,3.8% and 3.8%. Then the crustal thickness is 70 km, the average influences are 3.5%, 4.6%,3.0% and 2.5% respectively. | Tan Hongbo Shen Chongyang Xuan Songbai Yang Guangliang | 2011 | Geodesy and Geodynamics2011，2，1： | 0 |
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