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| 1 | Application of novel force control strategies to enhance robotic abrasive belt grinding quality of aero-engine blades显示文摘Robotic belt grinding has emerged as a finishing process in recent years for machining components with high surface finish and flexibility.The surface machining consistency,however,is difficult to be guaranteed in such a process.To overcome this problem,a method of hybrid force-position control combined with PI/PD control is proposed to be applied in robotic abrasive belt grinding of complex geometries.Voltage signals are firstly obtained and transformed to force information with signal conditioning methods.Secondly,zero drift and gravity compensation algorithms are presented to calibrate the F/T transducer which is installed on the robot end-effector.Next,a force control strategy combining hybrid force-position control with PI/PD control is introduced to be employed in robotic abrasive belt grinding operations where the force control law is applied to the Z direction of the tool frame and the positon control law is used in the X direction of the tool frame.Then,the accuracy of the F/T transducer and the robotic force control system is analyzed to ensure the stability and reliability of force control in the robotic grinding process.Finally,two typical cases on robotic belt grinding of a test workpiece and an aero-engine blade are conducted to validate the practicality and effectiveness of the force control technology proposed. | Xiaohu XU Dahu ZHU Haiyang ZHANG Sijie YAN Han DING | 2019 | Chinese Journal of Aeronautics2019，32，10： | 16 |
| 2 | Joint Inversion of the 3D P Wave Velocity Structure of the Crust and Upper Mantle under the Southeastern Margin of the Tibetan Plateau Using Regional Earthquake and Teleseismic Data显示文摘The special seismic tectonic environment and frequent seismicity in the southeastern margin of the Qinghai–Tibet Plateau show that this area is an ideal location to study the present tectonic movement and background of strong earthquakes in China's Mainland and to predict future strong earthquake risk zones. Studies of the structural environment and physical characteristics of the deep structure in this area are helpful to explore deep dynamic effects and deformation field characteristics, to strengthen our understanding of the roles of anisotropy and tectonic deformation and to study the deep tectonic background of the seismic origin of the block's interior. In this paper, the three-dimensional(3D) P-wave velocity structure of the crust and upper mantle under the southeastern margin of the Qinghai–Tibet Plateau is obtained via observational data from 224 permanent seismic stations in the regional digital seismic network of Yunnan and Sichuan Provinces and from 356 mobile China seismic arrays in the southern section of the north–south seismic belt using a joint inversion method of the regional earthquake and teleseismic data. The results indicate that the spatial distribution of the P-wave velocity anomalies in the shallow upper crust is closely related to the surface geological structure, terrain and lithology. Baoxing and Kangding, with their basic volcanic rocks and volcanic clastic rocks, present obvious high-velocity anomalies. The Chengdu Basin shows low-velocity anomalies associated with the Quaternary sediments. The Xichang Mesozoic Basin and the Butuo Basin are characterised by lowvelocity anomalies related to very thick sedimentary layers. The upper and middle crust beneath the Chuan–Dian and Songpan–Ganzi Blocks has apparent lateral heterogeneities, including low-velocity zones of different sizes. There is a large range of low-velocity layers in the Songpan–Ganzi Block and the sub–block northwest of Sichuan Province, showing that the middle and lower crust is relatively weak. The Sichuan Basin, which is located in the western margin of the Yangtze platform, shows high-velocity characteristics. The results also reveal that there are continuous low-velocity layer distributions in the middle and lower crust of the Daliangshan Block and that the distribution direction of the low-velocity anomaly is nearly SN, which is consistent with the trend of the Daliangshan fault. The existence of the low-velocity layer in the crust also provides a deep source for the deep dynamic deformation and seismic activity of the Daliangshan Block and its boundary faults. The results of the 3D P-wave velocity structure show that an anomalous distribution of high-density, strong-magnetic and high-wave velocity exists inside the crust in the Panxi region. This is likely related to late Paleozoic mantle plume activity that led to a large number of mafic and ultra-mafic intrusions into the crust. In the crustal doming process, the massive intrusion of mantle-derived material enhanced the mechanical strength of the crustal medium. The P-wave velocity structure also revealed that the upper mantle contains a low-velocity layer at a depth of 80–120 km in the Panxi region. The existence of deep faults in the Panxi region, which provide conditions for transporting mantle thermal material into the crust, is the deep tectonic background forthe area's strong earthquake activity. | LI Dahu LIAO Hua DING Zhifeng ZHAN Yan WU Pingping XU Xiaoming ZHENG Chen | 2018 | Acta Geologica Sinica(English Edition)2018，92，1： | 12 |
| 3 | Upper crustal velocity and seismogenic environment of the M7.0 Jiuzhaigou earthquake region in Sichuan, China显示文摘On August 8,2017,a magnitude 7.0 earthquake occurred in Jiuzhaigou County,Sichuan Province,China.The deep seismogenic environment and potential seismic risk in the eastern margin of Tibetan Plateau have once again attracted the close attention of seismologists and scholars at home and abroad.The post-earthquake scientific investigation could not identify noticeable surface rupture zones in the affected area;the complex tectonic background and the reason(s)for the frequent seismicity in the Jiuzhaigou earthquake region are unclear.In order to reveal the characteristics of the deep medium and the seismogenic environment of the M7.0 Jiuzhaigou earthquake region,and to interpret the tectonic background and genesis of the seismicity comprehensively,in this paper,we have reviewed all available observation data recorded by the regional digital seismic networks and large-scale,dense mobile seismic array(China Array)for the northern section of the North-South Seismic Belt around Jiuzhaigou earthquake region.Using double-difference seismic tomography method to invert the three-dimensional P-wave velocity structure characteristics of the upper crust around the Jiuzhaigou earthquake region,we have analyzed and discussed such scientific questions as the relationship between the velocity structure characteristics and seismicity in the Jiuzhaigou earthquake region,its deep tectonic environment,and the ongoing seismic risk in this region.We report that:the P-wave velocity structure of the upper crust around the Jiuzhaigoug earthquake region exhibits obvious lateral inhomogeneity;the distribution characteristics of the shallow P-wave velocity structure are closely related to surface geological structure and formation lithology;the M7.0 Jiuzhaigou earthquake sequence is closely related to the velocity structure of the upper crust;the mainshock of the M7.0 earthquake occurred in the upper crust;the inhomogeneous variation of the velocity structure of the Jiuzhaigou earthquake area and its surrounding medium appears to be the deep structural factor controlling the spatial distribution of the mainshock and its sequence.The 3D P-wave velocity structure also suggests that the crustal low-velocity layer of northeastern SGB(Songpan-GarzêBlock)stretches into MSM(Minshan Mountain),and migrates to the northeast,but the tendency to emerge as a shallow layer is impeded by the high-velocity zone of Nanping Nappe tectonics and the Bikou Block.Our results reveal an uneven distribution of high-and low-velocity structures around the Tazang segment of the East Kunlun fault zone.Given that the rupture caused by the Jiuzhaigou earthquake has enhanced the stress fields at both ends of the seismogenic fault,it is very important to stay vigilant to possible seismic hazards in the large seismic gap at the Maqu-Maqên segment of the East Kunlun fault zone. | DaHu Li ZhiFeng Ding Yan Zhan PingPing Wu LiJun Chang XiangYu Sun | 2021 | Earth and Planetary Physics2021，5，4： | 4 |
| 4 | Deep Seismogenic Environment in the Southern Section of the Longmenshan Fault Zone on the Eastern Margin of the Tibetan Plateau and Lushan M_s 7.0 Earthquake显示文摘The 2,026 earthquake events registered by the Sichuan regional digital seismic network and mobile seismic array after the April 20 th,2013 Lushan earthquake and 28,188 pieces of data were selected to determine direct P waves arrival times. We applied the tomographic method to inverse the characteristics of the velocity structure for the three-dimensional(3D) P wave in the mid-upper crust of the seismic source region of the Lushan earthquake. The imaging results were combined with the apparent magnetization inversion and magnetotelluric(MT) sounding retest data to comprehensively study the causes of the deep seismogenic environment in the southern section of the Longmenshan fault zone and explore the formation of the Lushan earthquake. Research has shown that there are obvious differences in velocity structure and magnetic distribution between the southern and northern sections of the Longmenshan fault zone. The epicenter of the Lushan earthquake is located near the boundary of the high and low-velocity anomalies and favorable for a high-velocity section. Moreover,at the epicenter of the Lushan earthquake located on the magnetic dome boundary of Ya'an,the development of high velocity and magnetic solid medium favors the accumulation and release of strain energy. Lowvelocity anomalies are distributed underneath the are of seismogenic origin,The inversion results of the MT retest data after the April 20 th Lushan earthquake also indicate that there a high-conductor anomaly occurs under the area of seismogenic origin of the Lushan earthquake,Therefore,we speculated that the presence of a high-conductivity anomaly and low-velocity anomaly underneath the seismogenic body of the Lushan earthquake could be related to the existence of fluids. The role of fluids caused the weakening of the seismogenic layer inside the mid-upper crust and resulted in a seismogenic fault that was prone to rupture and played a triggering role in the Lushan earthquake. | LI Dahu DING Zhifeng ZHAN Yan WU Pingping YE Qingdong | 2015 | Acta Geologica Sinica(English Edition)2015，89，2： | 4 |
| 5 | Adsorption of cesium from aqueous solution using agricultural residue – Walnut shell: Equilibrium, kinetic and thermodynamic modeling studies显示文摘 | Dahu Ding Yingxin Zhao Shengjiong Yang Wansheng Shi Zhenya Zhang Zhongfang Lei Yingnan Yang | 2013 | Water Research2013，，： | 4 |
| 6 | CKIP-1 suppresses the adipogenesis of mesenchymal stem cells by enhancing HDACl-associated repression of C/EBPα显示文摘 | Dahu Li HengZhu Chao Liang Wenbo Li Guichun Xing Lanzhi Ma Lujing Ding Yi Zhang Fuchu He Lingqiang Zhang | 2014 | Journal of Molecular Cell Biology2014，8，5： | 4 |
| 7 | Analysis and prediction of surface roughness for robotic belt grinding of complex blade considering coexistence of elastic deformation and varying curvature显示文摘Precision prediction of machined surface roughness is challenging facing the robotic belt grinding of complex blade,since this process is accompanied by significant elastic deformation.The resulting poor prediction accuracy,to a great extent,is attributed to the existing prediction model which less considers the dynamics.In this paper,an improved scallop height model is developed to predict and assess the machined surface roughness by taking into account the elastic deformation and the varying curvature of blade,then robotic belt grinding experiments are carried out to evaluate the proposed model from the perspective of surface roughness.Finally factors that influence the scallop height are analyzed,and the suitable empirical equation of surface roughness is proposed to assess and predict the surface quality from the aspect of blade concave and convex surface by adopting the constant scallop height machining. | XU XiaoHu YE SongTao YANG ZeYuan YAN SiJie ZHU DaHu DING Han | 2021 | Science China(Technological Sciences)2021，64，5： | 2 |
| 8 | Ef- ficiency of Transition Metal Modified Akadama Clay on Cesium Removal from Aqueous Solutions 显示文摘 | Ding Dahu Lei Zhongfang Yang Yingnan | 2014 | Chem Eng J2014，236，： | 1 |
| 9 | Investigation of phosphate adsorption from aqueous solution using Kanuma mud: Behaviors and mechanisms 显示文摘 | Yang Shengjiong Ding Dahu Zhao Yingxin | 2013 | Journal of Environmental Chemical Engineering2013，1，3： | 1 |
| 10 | Domestic sewage treatment in a sequencing batch biofilm reactor (SBBR) with an intelligent controlling system 显示文摘 | Dahu Ding Chuanping Feng Yunxiao Jin | 2011 | Desalination2011，276，13： | 1 |
| 11 | Adsorption of Cesium from Aqueous Solution Using Agricultural Residue-w alnut Shell:Equilibrium,Kinetic and Thermodynamic M odeling Studies显示文摘 | DING Dahu ZHAO Yingxin YANG Shengjiong | 2013 | Water Research2013，47，7： | 1 |
| 12 | Tool wear characteristics in machining of nickel-based su- peralloys 显示文摘 | ZHU DAHU ZHANG XIAOMING DING HAN | 2013 | International Journal of Machine Tools & Manufacture2013，64，： | 1 |
| 13 | Domestic sewage treatment in a sequencing batch biofilm reactor(SBBR)with an intelligent controlling system显示文摘 | Ding Dahu Feng Chuanping Jin Yunxiao | 2011 | Desalination2011，276，123： | 1 |
| 14 | Immobilization of heavy metals in sewage sludge by using subcritical water technology显示文摘 | Wansheng Shi Chunguang Liu Dahu Ding Zhongfang Lei Yingnan Yang Chuanping Feng Zhenya Zhang | 2013 | Bioresource Technology2013，，： | 1 |
| 15 | Efficiency of transition metal modified akadama clay on cesium removal from aqueous solutions显示文摘 | Dahu Ding Zhongfang Lei Yingnan Yang | 2014 | Chemical Engineering Journal2014，236，： | 1 |
| 16 | Influence of Ga-doping on the thermoelectric properties of Bi_(2-x)Ga_xTe_(2.7)Se_(0.3) alloy显示文摘Bi(2-x)GaxTe2.7Se0.3(x=0, 0.04, 0.08, 0.12) alloys were fabricated by vacuum melting and hot pressing technique. The structure of the samples was evaluated by means of X-ray diffraction. The peak shift toward higher angle can be observed by Ga-doping. The effects of Ga substitution for Bi on the electrical and thermal transport properties were investigated in the temperature range of 300–500 K. The power factor values of the Ga-doped samples are obviously improved in the temperature range of 300–440 K. Among all the samples, the Bi(2-x)GaxTe2.7Se0.3(x=0.04) sample showed the lowest thermal conductivity near room temperature and the maximum ZT value reached 0.82 at 400 K. | Xingkai Duan Konggang Hu Shifeng Ding Dahu Man Haixia Jin | 2015 | Progress in Natural Science:Materials International2015，25，1： | 1 |
| 17 | Effective adsorption of Cr (VI) from aqueous solution using natural Akadama clay显示文摘 | Yingxin Zhao Shengjiong Yang Dahu Ding Jie Chen Yingnan Yang Zhongfang Lei Chuanping Feng Zhenya Zhang | 2013 | Journal of Colloid And Interface Science2013，，： | 1 |
| 18 | Tool wear characteristics in machining of nickel-based superalloys显示文摘 | Dahu Zhu Xiaoming Zhang Han Ding | 2013 | International Journal of Machine Tools and Manufacture2013，，： | 1 |
| 19 | Domestic sewage treatment in a sequencing batch biofilm reactor (SBBR) with an intelligent controlling system显示文摘 | Dahu Ding a Chuanping Feng Yunxiao Jin | 2011 | Desal- ination2011，276，： | 1 |
| 20 | Breeding and Characteristics of a New Wheat Variety Jike 33显示文摘Jike 33 is a new disease-resistant high-yield multi-ear wheat variety with strong gluten bred by Anhui New Century Agricultural Co.,Ltd. in 2001 with Yannong 19 as the female parent and the self-selected Jike 19( variant of Lumai 14) as the male parent. In 2011-2012,the variety participated in the semi-winter wheat regional test in Huaibei area of Anhui Province,and exhibited a yield of 519. 5 kg/667 m^2,which was 7. 83% higher than that of Wanmai 50 as the CK. In the semi-winter wheat regional test in Huaibei area of Anhui Province in 2012-2013,it showed an average yield of 522. 1 kg/667 m^2,which was 14. 5% higher than that of Wanmai 50 as the CK. and in 2013-2014,the variety participated in the semi-winter wheat production test in Anhui Province,and showed an average yield of 589. 30 kg/667 m2,which was 7. 30% higher than that of Wanmai 52 as the CK. Jike 33 was approved by the Anhui Crop Variety Approval Committee in July,2015. | Siyou XU Kai DING Dahu SHANG Shansan NIU Shilong XIE Tongfu MA | 2019 | Agricultural Biotechnology2019，8，1： | 0 |
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