|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Ore-forming event and geodynamic setting of molybdenum deposit at Wenquan in Gansu Province,Western Qinling显示文摘The Wenquan molybdenum deposit is associated with a Triassic granite in this area.The Wenquan granite is enriched in LILE and LREE,poor in HFSE,and has significantly higher contents of alkali(K2O+Na2O) and Sr,Ba than those of the island arc volcanic rocks.These geochemical characteristics are similar to post-collisional granites in high K calc-alkaline series.Studies of major elements,trace elements,REEs and chronology of the Wenquan pluton show that,in the geodynamic transition stage of continent-continent convergence to extension,the partial melting of the enriched lithospheric mantle generated the basaltic magma and triggered the partial melting of the thickened lower crust which produceded the acidic magma,and the Wenquan pluton was formed by mixing of the two magmas.Molybdenite Re-Os isotopic dating gave Os model ages of 212.7±2.6 Ma to 215.1±2.6 Ma with a weighted mean of 214.1±1.1 Ma,and an Re-Os isochron age of 214.4±7.1 Ma.These ages are close to K-Ar ages(223 to 226 Ma) and a SHRIMP zircon U-Pb age(223±7 Ma) for the Wenquan granite within the error range,but relatively younger.This implies that the Mo mineralization occurred in a late stage of the magmatic intrusion,and the metallogenesis took place in the transition stage from syn-collision to post-collision in the tectonic setting of the Qinling Orogenic Belt(QOB) after continental collision be-tween the North China Block(NCB) and the South China Block(SCB).This process is also corre-sponding to the geological events of metamorphism and deformation in South Qinling,closure of the Mian-Lue oceanic basin,and exhumation of the Dabie-Sulu ultrahigh-pressure metamorphic rocks.The large-scale continent-continent collision between NCB and SCB in the middle Triassic triggered sig-nificant crustal thickening and exhumation of subducted slab.In the late Triassic,the tectonic setting was transformed to the transition stage from collision to extension.Materials from the asthenospheric mantle would ascend into the root of the lower crust,which could induce partial melting of the lower crust and generate Mo-enriched granitic magma.The ore-forming elements enriched in the fluid derived from the condensation and fraction of the magma resulted in the Mo mineralization.The Mo deposits in the QOB are mainly formed in two episodes,namely 220± Ma and 140± Ma.The two episodes of metal-logenesis were developed in the tectonic transition settings from compression to extension,but they were in the different stages of the tectonic evolution.The occurrence of the Wenquan Mo-bearing plu-ton indicates that the Triassic tectonic-magmatic belt of Western Qinling is another favorable region for Mo mineralization in the QOB.Therefore,it is significant to pay more attention to evaluation of the ore-forming potentiality in the Triassic granites in Western Qinling. | ZHU LaiMin DING ZhenJu YAO ShuZhen ZHANG GuoWei SONG ShiGang QU WenJun GUO Bo LEE Ben | 2009 | Chinese Science Bulletin2009，54，13： | 12 |
| 2 | Development of a vision-based ground target detection and tracking system for a small unmanned helicopter显示文摘It is undoubted that the latest trend in the unmanned aerial vehicles (UAVs) community is towards visionbased unmanned small-scale helicopter, utilizing the maneuvering capabilities of the helicopter and the rich information of visual sensors, in order to arrive at a versatile platform for a variety of applications such as navigation, surveillance, tracking, etc. In this paper, we present the development of a vision- based ground target detection and tracking system for a small UAV helicopter. More specifically, we propose a real-time vision algorithm, based on moment invariants and two-stage pattern recognition, to achieve automatic ground target detection. In the proposed algorithm, the key geometry features of the target are extracted to detect and identify the target. Simultaneously, a Kalman filter is used to estimate and predict the position of the target, referred to as dynamic features, based on its motion model. These dynamic features are then combined with geometry features to identify the target in the second-stage of pattern recognition, when geometry features of the target change significantly due to noise and disturbance in the environment. Once the target is identified, an automatic control scheme is utilized to control the pan/tilt visual mechanism mounted on the helicopter such that the identified target is to be tracked at the center of the captured images. Experimental results based on images captured by the small-scale unmanned helicopter, SheLion, in actual flight tests demonstrate the effectiveness and robustness of the overall system. | LUM Kai-Yew CHEN Ben M. LEE Tong H. | 2009 | Science in China(Series F)2009，52，11： | 9 |
| 3 | He-Ar isotopic system of fluid inclusions in pyrite from the molybdenum deposits in south margin of North China Block and its trace to metallogenetic and geodynamic background显示文摘The helium and argon isotopic compositions of the ore-forming fluids from the molybdenum deposits such as Jinduicheng, Donggou, Shijiawan, and Sandaozhuang, which are located in the East Qinling molybdenum belt in south margin of North China Block (SMCNB), are reported in this paper. The origin and the evolution of the ore-forming fluids and their coupled-relationships with the intra-continental collision and orogenic process of Qinling Orogen in Mesozoic-Cenozoic have been discussed. The 3He/4He and 40Ar/36Ar values (3He/4He=1.38―3.64 Ra, and 40Ar/36Ar=295.68―346.39, respectively) of the fluid inclusions in pyrite from the molybdenum deposits in East Qinling suggest that, the ore-forming fluid system is mixed by two end members. One is the high temperature deep-derived fluid congenetic with the porphyries generated by crust-mantle mixing, and the other is the low-temperature meteoric water which is rich in crustal radiogenic He with the component of atmospheric Ar. From the Pb isotopic composition, and ore-bearing potential of the porphyry and the regional stratum, we can conclude that the ore-forming materials of the deposits in the East Qinling molybdenum belt are derived from the deep source by the mixing of lower crust and upper mantle. Therefore, the formation of the molybdenum deposits in SMNCB can be related to the crust-mantle interaction, which is accompanied by the intra-continental orogenic and extension process in the post-collision period of Qinling Orogen. The granitic porphyries which are related to Mo mineralization are not simple crust-remelting type granites or S type granites, but belong to syntexis-type or mantle-derived granites, hence their formation has a profound and regional geodynamic background. | ZHU LaiMin ZHANG GuoWei GUO Bo LEE Ben | 2009 | Chinese Science Bulletin2009，54，14： | 8 |
| 4 | Zircon U-Pb dating and geochemical study of the Xianggou granite in the Ma'anqiao gold deposit and its relationship with gold mineralization显示文摘Single zircon LA-ICP-MS U-Pb dating and lithogeochemical studies have been performed on the Xianggou monzonitic granitic porphyry outcropped in the Ma'anqiao gold deposit.A weighted average U-Pb age of 242.0±0.8 Ma for Xianggou monzonitic porphyry has been obtained.This corresponds with the conclusions of previous studies indicating a syn-orogenic age (242±21 Ma) of the Qinling Orogenic Belt,suggesting that the formation of the Xianggou granite should be associated with the collisional event of the North China Plate and the Yangtze Plate in the Indosinian period.The Xianggou granite is characterized by the high silicon and alkali of high K calc-alkaline series granites.It is rich in Al (Al2O3=14.49%-15.61%) and Sr (457.10-630.82 ppm),poor in Y (<16 ppm) and HREE (Yb<0.45 ppm),and exhibits high ratios of Sr/Y (76.24-97.34) and (La/Yb)N (29.65-46.10),as well as strongly fractionated REE patterns.These geochemical characteristics suggest the Xianggou granite can be classified as C-type adakitic rock.The initial Sr isotope ratios for the Xianggou granite vary from 0.70642 to 0.70668,εNd(t) values from -4.54 to -3.98,and TDM values from 1152 Ma to 1220 Ma.The low εNd(t) and ISr and high TDM values,as well as Na2O/K2O ratios of the Xianggou granite are close to 1 (Na2O/K2O=0.95-1.10),indicating that it is not an I-type adakite formed by partial melting of the subducting oceanic crust,nor adakitic rock formed by melting of the underplated basaltic lower crust,but the product of partial melting of the nonunderplated basaltic thickened lower crust.Zircons from the Xianggou pluton have a homogeneous Hf isotopic composition with negative εHf(t) values (between -9.7 and -5.9,with an average of -6.9),indicating that the rock-forming materials were mostly extracted from the ancient crust,not from the depleted mantle.The Xianggou monzonitic granitic porphyry is rich in LILE and LREE and depleted in HSFE,HREE and Y;the composition of trace element and REE are similar to those of the syn-collisional granites.The geological and geochemical characteristics of the Xianggou granite reveal that it was a product of partial melting of the basaltic rocks from the thickened lower crust,triggered by continental collision,which occurred in the geodynamic background of continental-continental collision and shearing within the crust.The Xianggou granite was intruded in the compressive orogenic environment 242 Ma ago,but the gold mineralization occurred in the transitional environment of compression to extension around 170 Ma ago,lagging behind the intrusive age of the Xianggou granite by about 70 Ma.Meanwhile,the distribution of trace elements and REEs of the Xianggou monzonitic granitic porphyry is distinct from that of ores,suggesting the absence of direct genetic relationship between the Xianggou granite and gold mineralization.In contrast,the relatively high ore-forming elemental content of the Xianggou monzonitic granitic porphyry is due to the rock having experienced Au-bearing hydrothermal alteration.From the view of gold mineralization,considering the intrusive age,structural deformation,as well as alteration of the granite,we can conclude that the Xianggou pluton was a pre-ore-intrusion,whose intrusive age of 242 Ma constrains the lower time limit of gold metallogenesis.Following the intrusive event of the syn-collisional granitic porphyry and the intensively brittle-ductile shear deformation,large-scale fluid activity and gold mineralization took place. | LEE Ben | 2010 | Science China Earth Sciences2010，53，2： | 8 |
| 5 | Geological characteristics,metallogenic background,and genesis of the Tongyu VHMS copper deposit in the west part of the North Qinling,Shaanxi Province显示文摘The Tongyu volcanic-hosted massive sulfide(VHMS) copper deposit is located in the west part of the North Qinling(NQL),Shaanxi Province.Here we report geological features and trace elemental characteristics of ores,mineralized rocks,and volcanic host rocks of this deposit.We also conducted in situ zircon U-Pb and Lu-Hf LA-ICP-MS dating and lithogeochemical study of the Meigou granodiorite,which is intruded in the south of the Tongyu mining district.It is inferred that the volcanic host rocks of the Tongyu Cu deposit belong to calc-alkaline island arc volcanic rocks,and the volcanic host rocks and the ore-forming materials share common material sources.During subduction of the Paleo-Qinling oceanic slab at around 472 Ma,high oxygen-fugacity aqueous fluid released by dehydration reaction of the subducting slab rose into the mantle wedge,leached Cu and other metal elements,and triggered partial melting of the mantle wedge.Associated with the ore-forming materials,the arc calc-alkaline magmas erupted and formed the Tongyu VHMS deposit.The weighted average zircon U-Pb age of the Meigou granodiorite is 439.3±3 Ma,suggesting its genesis is associated with the subduction event of the Paleo-Qinling oceanic plate around 440 Ma.In terms of the granitoid's geochemical characteristics,the Mg#,Ni,and Cr contents are high.REE show strongly fractionated patterns with unobvious Eu anomalies.Sr contents are high while Y contents are low,resulting in high Sr/Y ratios.Two-stage zircon Hf model ages mostly range between 908 and 723 Ma,with εHf(t)>0.Therefore,we classify Meigou granodiorite as island arc granite with adakitic geochemical features.It was generated by interaction between mantle wedge and melt produced by partial melting of the subducted basaltic slab of the Paleo-Qinling Ocean.The Tongyu VHMS deposit was formed in the island arc tectonic setting during Ordovician-Silurian between 439.3±3 Ma and 472±11 Ma.The volcanic exhalation-sedimentation,which was contemporaneous with the submarine volcanics,produced the primary mineralization of the Tongyu Cu deposit.Afterward,the ore bodies and host rocks were reworked and overprinted intensively by structures corresponding with the overall collisional orogenic process of the Qinling Orogenic Belt during the Indosinian period.In contrast to classic VHMS deposits such as the Kuroko deposit in Japan,the Tongyu Cu deposit possesses the dual characteristics of island arc volcanic exhalation and sedimentation as well as structural reworking and overprinting.Therefore,the Tongyu VHMS Cu deposit is a volcanic exhalation and sedimentation-structural reworking and overprinting type deposit. | Ben Lee LaiMin Zhu GuoWei Zhang Bo Guo HuJun Gong AnPing Yao | 2010 | Science China Earth Sciences2010，53，10： | 5 |
| 6 | Design and implementation of a leader-follower cooperative control system for unmanned helicopters显示文摘In this paper,we present a full scheme for the cooperative control of multiple unmanned aerial vehicle(UAV)helicopters.We adopt the leader-follower pattern to maintain a fixed geometrical formation while navigating the UAVs following certain trajectories.More specifically,the leader is commanded to fly on some predefined trajectories,and each follower is controlled to maintain its position in formation using the measurement of its inertial position and the information of the leader position and velocity,obtained through a wireless modem.More specifications are made for multiple UAV formation flight.In order to avoid possible collisions of UAV helicopters in the actual formation flight test,a collision avoidance scheme based on some predefined alert zones and protected zones is employed.Simulations and experimental results are presented to verify our design. | Ben YUN Ben M. CHEN Kai Yew LUM Tong H. LEE | 2010 | 控制理论与应用(英文版)2010，8，1： | 5 |
| 7 | Effect of coronary bifurcation angle on clinical outcomes in Chinese patients treated with crush stenting: a subgroup analysis from DKCRUSH-1 bifurcation study显示文摘背景分叉角度可以影响压碎 stenting 的临床的结果。我们寻求了比较高度(60 ( | CHEN Shao-liang ZHANG Jun-jie YE Fei CHEN Yun-dai FANG Wei-yi WEI Meng HE Ben SUN Xue-wen YANG Song CHEN Jin-guo SHAN Shou-jie TIAN Nai-liang LI Xiao-bo LIU Zhi-zhong KAN Jing Lee Michael Kwan Tak W | 2009 | Chinese Medical Journal2009，，4： | 5 |
| 8 | Cardiorenal biomarkers in acute heart failure显示文摘与心失败(HF ) 管理病人是在肾的功能能极大地增加的变得更坏联系的本身,而是存在以内的一项挑战性的任务死亡和病态。早诊断和治疗是钥匙阻止再进医院和还原剂保健费用。Biomarkers 长在与 HF 诊断和预言的病人作为高度敏感、特定的工具被建立了。思考不同 pathophysiological 事件和进行中的细胞的侮辱, biomarkers 被证明优异到常规实验室测试。更好的试金和快速的分析的可获得性作为紧急情况部门并且在病人的床边的 point-of-care 测试允许 biomarkers 的使用。尖锐 HF 病人经常继续发展变得更坏肾的功能,称为的同样尖锐的 cardiorenal 症候群。研究的成长宽度显示出联合多重 biomarkers 更好制定结果并且在如此的病人生产理想的结果的含意。 | Rajiv Choudhary Dipika Gopal Ben A. Kipper Alejandro De La Parra Landa Hermineh Aramin Elizabeth Lee Saloni Shah Alan S. Maisel | 2012 | Journal of Geriatric Cardiology2012，9，3： | 4 |
| 9 | RADAR OBSERVATION OF PRECIPITATION ASYMMETRIES IN TROPICAL CYCLONES MAKING LANDFALL ON EAST CHINA COAST显示文摘This study explores,for the first time,the asymmetric distribution of precipitation in tropical cyclones(TCs) making landfall along east China coast using reflectivity data collected from coastal Doppler radars at China's Mainland and Taiwan.Six TCs(Saomai,Khanun,Wipha,Matsa,Rananim and Krosa) from 2004 to 2007 are examined.The temporal and spatial evolution of these TCs’ inner and outer core asymmetric precipitation patterns before and after landfall is investigated.The radius of inner-core region is a function of the size of a TC apart from a fixed radius(100 km) adopted in previous studies.All six TCs possessed distinct asymmetric precipitation patterns between the inner-and outer-core regions.The amplitude of asymmetry decreases with the increasing TC intensity and it displays an ascending(descending) trend in the inner(outer) core.In the inner-core region,the heavy rainfall with reflectivity factor above 40 d BZ tends to locate at the downshear side before landfall.Four cases have precipitation maxima on the downshear left side,in agreement with previous studies.As TCs approaching land(~ 2 hr before landfall),their precipitation maxima generally shift to the front quadrant of the motion partly due to the interaction of TC with the land surface.In the outer-core region,the precipitation maxima occur in the front quadrant of the motion in five of the six cases before landfall.After landfall,the precipitation maxima shift from the right-front quadrant clockwisely to the right-rear quadrant of the motion collocated well with the mountainous areas along the coast,which indicates the impact of topography forcing on the precipitation distribution.This study illustrated how the precipitation asymmetry in the inner-and outer-core at different stages of TC landfall is affected by storm motion,vertical wind shear and topography. | DAN WU KUN ZHAO BEN JONG-DAO JOU WEN-CHAU LEE | 2013 | Tropical Cyclone Research and Review2013，2，2： | 3 |
| 10 | A Chromatin-Mediated Reversible Drug-Tolerant State in Cancer Cell Subpopulations显示文摘 | Sreenath V. Sharma Diana Y. Lee Bihua Li Margaret P. Quinlan Fumiyuki Takahashi Shyamala Maheswaran Ultan McDermott Nancy Azizian Lee Zou Michael A. Fischbach Kwok-Kin Wong Kathleyn Brandstetter Ben Wittner Sridhar Ramaswamy Marie Classon Jeff Settleman | 2010 | Cell2010，，1： | 2 |
| 11 | A Systematic Review of Medial and Lateral Entry Pinning Versus Lateral Entry Pinning for Supracondylar Fractures of the Humerus显示文摘 | Carmen Alisa Brauer Ben Minsuk Lee Donald S. Bae Peter M. Waters Mininder S. Kocher | 2007 | Journal of Pediatric Orthopaedics2007，，2： | 2 |
| 12 | Expandable liner hanger provides cost-effective alternative solution显示文摘 | LEE LOHOEFER C MATHIS BEN DAVID BRISCO | | SPE0，2000，： | 1 |
| 13 | A MATLAB toolkit for composite nonlinear feedback control–improving transient response in tracking control显示文摘We present in this article a MATLAB toolkit with a user-friendly graphical interface for composite nonlinear feedback control system design.The toolkit can be utilized to design a fast and smooth tracking controller for a class of linear systems and nonlinear systems with actuator and other nonlinearities as well as with external disturbances.The parameters of the controller can be tuned easily on the user panel or autotuned by the toolkit.The toolkit is capable of displaying both time-domain and frequency-domain responses on its main panel and generating three different types of control laws,namely,the state feedback,the full-order measurement feedback and the reduced-order measurement feedback controllers.The usage and design procedure of the toolkit are illustrated by practical examples on a rotational/translational actuator (RTAC) system and a hard disk drive servo system.The toolkit can be utilized to design servo systems that deal with point-and-shoot fast targeting. | Guoyang CHENG Ben M. CHEN Kemao PENG Tong H. LEE | 2010 | 控制理论与应用(英文版)2010，8，3： | 1 |
| 14 | Zircon U-Pb ages and Hf isotopic characteristics of the Dehe biotite monzonitic gneiss pluton in the North Qinling orogen and their geological significance显示文摘The Dehe granitic pluton intruded the Xiahe Group which is in the core complex of the North Qinling Orogenic Belt(NQOB).It shows gneissic bedding and possesses typical S-type granite minerals such as muscovite and garnet.LA-ICP-MS U-Pb isotopic dating of the Dehe granite yielded a weighted average age of 925±23 Ma which represents the emplacement age of the pluton.Most of the εHf(t) values are negative,and the two-stage model ages are consistent with the age of the Qinling Group.The isotope data show that the Dehe granite was formed in the following geological setting:in the syn-collision setting of the NQOB in the Neoproterozoic,crustal thickening induced partial melting of materials derived from the Qinling complex,and then the maga upwelled and intruded into the Xiahe Group.The formation of the Dehe S-type granite implied the occurrence of a convergent event in the QOB during the Neoproterozoic. | Wang, Fei Zhu, Laimin Li, Jiming Lee, Ben Gong, Hujun Yang, Tao Wang, Wei Xu, Ao | 2011 | Chinese Journal Of Geochemistry2011，30，2： | 1 |
| 15 | Energy Efficient Routing Protocols for Mobile Ad Hoc Networks显示文摘 | Chansu Yu Ben Lee Hee Yong Youn | 2003 | Wireless Communications and Mobile Computing ( WCMC )Journal2003，3，8： | 1 |
| 16 | Better understanding ofthe filtration characteristics in the flexible fibre filtermodule (3FM)显示文摘 | LEE J J IM J H BEN A R | 2007 | Water Science and Technology2007，55，12： | 1 |
| 17 | Fiber filter as analternative to the process of flocculation-sedimentationfor water treatment显示文摘 | LEE J J CHA J H BEN A R | 2008 | Desalination2008，231，123： | 1 |
| 18 | Lead concentrations and isotopes in aerosols from Xiamen, China 显示文摘 | ZHU Laimin TANG Jianwu LEE Ben | 2010 | Marine Pollution Bulletin2010，60，11： | 1 |
| 19 | External versus edo-scopic dacryocystorhinostomy for acquired nasolacrimal ductobstruction in a tertiary referral center显示文摘 | Ben Simon GJ Joseph J Lee S | 2005 | Ophthalmology2005，112，： | 1 |
| 20 | External versus endoscopic dacryocystorhinostomy for acquired nasolacrimal duct obstruction in a tertiary referral center 显示文摘 | Ben Simon GJ Joseph J Lee S | 2005 | Ophthalmology2005，112，： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员