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In-situ LA-ICP-MS trace element and oxygen isotope signatures of magnetite from the Yamansu deposit,NW China,and their significance

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Acta Geochimica 2020年第5期39卷 599-615页

作者： Zhiyuan Sun yuwang Wang Lingli Long Technic Research Center for Deep Resources Exploration in Non-ferrous Metal Mines Beijing Institute of Geology for Mineral Resources5 YardBeiyuanChaoyang DistrictBeijing 100012China

The Yamansu iron deposit is hosted in submarine volcanic rocks in the Aqishan–Yamansu belt of Eastern Tianshan,NW China.A geological cross-section for the Carboniferous strata in the ore district shows that ore bodies in the Yamansu deposit are hosted in andesitic crystal tuff of the third cycle of the Carboniferous Yamansu *** indicates an association between mineralization and *** orebodies are strata bound and lensoid and generally share the occurrence state of the host *** mineralization mainly occurs asbreccia ores,ores in the mineralized volcanic rocks,massive ores,and sulfide-rich ores according to their structures and sequences of *** element compositions of magnetite from various types of ores were determined by *** dataset indicates thatdifferent types of magnetite havedistinct trace element contents correlated to their formation *** crystals from breccia ores have high Ti,Ni,V,Cr,and Co and low Si,Al,Ca,and Mg contents,indicating crystallization from a volcanic magmatic eruption,which is consistent with field evidence of coexisting altered volcanic *** crystals from ores in the mineralized volcanic rocks have moderate Ti,Ni,V,Cr,and Co *** contrast,magnetite from massive ores and sulfide-rich ores have low concentrations of Ti,Cr,Ni,and V,high concentrations of Si,Al,Ca,and Mg,and evidence of hydrothermal ***-situ magnetite compositions imply a magmatic-hydrothermal *** d18 O values for magnetite grains from Yamansu vary(?1.3 to?7.0%),they all plot in the range field of volcanic iron deposits,and they also record a magmatic-hydrothermal *** compositions of Yamansu magnetites are interpreted as controlled mainly by temperature,fluid,host rock buffering,oxygen fugacity,and sulfur *** metallogenic conditions of the Yamansu deposit changed from high temperature and low oxygen fugacity to low temperature and high oxygen fugacit

关键词： Magnetite Trace element composition LAICP-MS Oxygen isotope Yamansu iron deposit Eastern Tianshan

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Room Temperature Phosphorescence of 1-Bromo-4-(bromoacetyl) naphthalene Induced by Sodium Deoxycholate

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Chinese Chemical Letters 2004年第3期15卷 339-342页

作者： yuwang WeiJunJIN JianBingCHAO LiPingQIN DepartmentofChemistry ShanxiUniversityTaiyuan030006

Sodium deoxycholate (NaDOC) could induce 1-bromo-4-(bromoacetyl) naphthalene (BBAN) to emit strong room temperature phosphorescence (RTP). Measurements of phosphore- scence spectra, peak intensity and polarization we... 详细信息

关键词： Sodium deoxycholate 1-bromo-4-(bromoacetyl) naphthalene room temperature phos- phorescence.

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Room Temperature Phosphorescence pH Switch Based on Photo-induced Electron Transfer

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Chinese Chemical Letters 2004年第9期15卷 1131-1134页

作者： LiXuanMU yuwang ZhaoZHANG WeiJunJIN SchoolofChemistryandChemicalEngineering ShanxiUniversityTaiyuan030006

In this paper, photoinduced electron transfer(PET) phosphoroionophore, N-(1-bromo- 2-naphthylmethyl)-diethanolamine (BND) was synthesized and its phosphorescent characteristics were studied. The experimental results showed that strong phosphorescence could be observed in b-cyclodextrin aqueous solution only at low pH value. This system combined AND and NOT function to produce a three-input inhibit (INH) logic gate.

关键词： Room temperature phosphorescence pH switch photoinduced electron transfer N-(1- bromo-2-naphthylmethyl)diethanolamine b-cyclodextrin logic gate.

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Design and Analysis of a 2-DOF Actuator with Variable Stiffness Based on Leaf Springs

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Journal of Bionic Engineering 2022年第5期19卷 1392-1404页

作者： ShangKui Yang Peng Chen DongQi Wang Yi Yu yuwang Liu State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of SciencesShenyang 110000China Institutes for Robotics and Intelligent Manufacturing Chinese Academy of SciencesShenyang 110000China Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education School of Mechanical Engineering Tianjin UniversityTianjin 300192China University of Chinese Academy of Sciences Beijing 100049China

Variable Stiffness Actuator(VSA)is the core mechanism to achieve physical human–robot interaction,which is an inevitable development trend in *** existing variable stiffness actuators are basically single degree-of-freedom(DOF)rotating joints,which are achieving multi-DOF motion by cascades and resulting in complex robot body *** this paper,an integrated 2-DOF actuator with variable stiffness is proposed,which could be used for bionic wrist joints or shoulder *** 2-DOF motion is coupling in one universal joint,which is different from the way of single DOF actuators *** on the 2-DOF orthogonal motion generated by the spherical wrist parallel mechanism,the stiffness could be adjusted by varying the effective length of the springs,which is uniformly distributed in the variable stiffness *** variable stiffness principle,the model design,and theoretical analysis of the VSA are discussed in this *** independence of adjusting the equilibrium position and stiffness of the actuator is validated by *** results show that the measured actuator characteristics are sufficiently matched the theoretical *** the future,VSA could be used in biped robot or robotic arm,ensuring the safety of human–robot interaction.

关键词： Physical human-robot interaction 2-DOF Bionic wrist joints Variable stiffness actuator Leaf spring

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Special Issue on Reconfigurable Robots

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Chinese Journal of Mechanical Engineering 2020年第5期33卷 1-3页

作者： Jinguo Liu yuwang Liu Guangbo Hao State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of ScienceShenyang 110016China School of Engineering University College CorkCorkIreland

Reconfigurable robots have the characteristics that structures can be changed or *** can adapt to different environments and tasks through changing configurations or structures,which is a hot research direction in recent *** researches has not yet formed a complete theoretical method system of reconfigurable ***,exploring new design theories,key technologies and typical applications is an effective way to promote the rapid development of this field.

关键词： Reconfigurable environments robots

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Design and modeling of a novel soft parallel robot driven by endoskeleton pneumatic artificial muscles

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Frontiers of Mechanical Engineering 2022年第2期17卷 71-84页

作者： Peng CHEN Tingwen YUAN Yi YU yuwang LIU State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of SciencesShenyang 110016China Institutes for Robotics and Intelligent Manufacturing Chinese Academy of SciencesShenyang 110169China University of Chinese Academy of Sciences Beijing 100049China School of Mechanical Engineering Northeastern UniversityShenyang 110000China

Owing to their inherent great flexibility, good compliance, excellent adaptability, and safe interactivity, soft robots have shown great application potential. The advantages of light weight, high efficiency, non-polluting characteristic, and environmental adaptability provide pneumatic soft robots an important position in the field of soft robots. In this paper, a soft robot with 10 soft modules, comprising three uniformly distributed endoskeleton pneumatic artificial muscles, was developed. The robot can achieve flexible motion in 3D space. A novel kinematic modeling method for variable-curvature soft robots based on the minimum energy method was investigated, which can accurately and efficiently analyze forward and inverse kinematics. Experiments show that the robot can be controlled to move to the desired position based on the proposed model. The prototype and modeling method can provide a new perspective for soft robot design, modeling, and control.

关键词： pneumatic artificial muscles soft robot modeling approach principle of virtual work external load

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Solving open vehicle problem with time window by hybrid column generation algorithm

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Journal of Systems Engineering and Electronics 2022年第4期33卷 997-1009页

作者： YU Naikang QIAN Bin HU Rong CHEN yuwang WANG Ling School of Mechanical and Electrical Engineering Kunming University of Science and TechnologyKunming 650500China School of Information Engineering and Automation Kunming University of Science and TechnologyKunming 650500China Yunnan Key Laboratory of Artificial Intelligence Kunming University of Science and TechnologyKunming 650500China Alliance Manchester Business School University of ManchesterManchester M139SSU.K. Department of Automation Tsinghua UniversityBeijing 100084China

This paper addresses the open vehicle routing problem with time window(OVRPTW), where each vehicle does not need to return to the depot after completing the delivery *** optimization objective is to minimize the total distance. This problem exists widely in real-life logistics distribution *** propose a hybrid column generation algorithm(HCGA) for the OVRPTW, embedding both exact algorithm and metaheuristic. In HCGA, a label setting algorithm and an intelligent algorithm are designed to select columns from small and large subproblems, respectively. Moreover, a branch strategy is devised to generate the final feasible solution for the OVRPTW. The computational results show that the proposed algorithm has faster speed and can obtain the approximate optimal solution of the problem with 100 customers in a reasonable time.

关键词： open vehicle routing problem with time window(OVRPTW) hybrid column generation algorithm(HCGA) mixed integer programming label setting algorithm

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In vitro resistance to interferon of hepatitis B virus with precore mutation

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World Journal of Gastroenterology 2005年第5期11卷 649-655页

作者： YanWang LaiWei DongJiang XuCong RanFei JiangXiao yuwang HepatologyInstitute PekingUniversityPeople'sHospitalBeijing100044China

AIM: Chronic hepatitis B virus (HBV) infection is predominantly treated with interferon alpha (IFN-α), which results in an efficient reduction of the viral load only in 20-40% of treated patients. Mutations at HBV precore prevail in different clinical status of HBV infection. The roles of precore mutation in the progression of chronic hepatitis and interferon sensitivity are still unknown. The aim of this study was to explore if there was any relationship between HBV precore mutation and sensitivity to interferon in vitro. METHODS: HBV replication-competent recombinant constructs with different patterns of precore mutations were developed. Then the recombinants were transiently transfected into hepatoma cell line (Huh7) by calcium phosphate transfection method. With or without IFN, viral products in culture medium were collected and quantified 3 d after transfection. RESULTS: We obtained 4 recombinant constructs by orientation-cloning 1.2-fold-overlength HBV genome into pUC18 vector via the EcoRI and Hind lll and PCR mediated site-directed mutagenesis method. All the recombinants contained mutations within precore region. Huh7 cells transfected with recombinants secreted HBsAg and HBV particles into the cell culture medium, indicating that all the recombinants were replication-competent. By comparing the amount of HBV DNA in the medium, we found that HBV DNA in medium reflecting HBV replication efficiency was different in different recombinants. Recombinants containing precore mutation had fewer HBV DNAs in culture medium than wild type. This result: showed that recombinants containing precore mutation had lower replication efficiency than wild type. HBV DNA was decreased in pUC18-HBV1.2-WT recombinants after IFN was added while others with precore mutations were not, indicating that HBV harboring precore mutation was less sensitive to IFN in cell culture system. CONCLUSION: These data indicate that HBV harboring precore mutation may be resistant to IFN in vitro.

关键词： Hepatitis B virus Mutation Interferon Viral resistance

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Spaceborne GPS receiver antenna phase center offset and variation estimation for the Shiyan 3 satellite

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Chinese Journal of Aeronautics 2016年第5期29卷 1335-1344页

作者： Gu Defeng Lai yuwang Liu Junhong Ju Bing Tu Jia College of Sciences National University of Defense Technology

In determining the orbits of low Earth orbit （LEO） satellites using spaceborne GPS, the errors caused by receiver antenna phase center offset （PCO） and phase center variations （PCVs） are gradually becoming a major limiting factor for continued improvements to accuracy. Shiyan 3, a small satellite mission for space technology experimentation and climate exploration, was developed by China and launched on November 5, 2008. The dual-frequency GPS receiver payload delivers 1 Hz data and provides the basis for precise orbit determination within the range of a few centimeters. The antenna PCO and PCV error characteristics and the principles influencing orbit determination are analyzed. The feasibility of PCO and PCV estimation and compensation in different directions is demonstrated through simulation and in-flight tests. The values of receiver antenna PCO and PCVs for Gravity Recovery and Climate Experiment （GRACE） and Shiyan 3 satellites are estimated from one month of data. A large and stable antenna PCO error, reaching up to 10.34 cm in the z-direction, is found with the Shiyan 3 satellite. The PCVs on the Shiyan 3 satellite are estimated and reach up to 3.0 cm, which is slightly larger than that of GRACE satellites. Orbit validation clearly improved with independent k-band ranging （KBR） and satellite laser ranging （SLR） measurements. For GRACE satellites, the average root mean square （RMS） of KBR residuals improved from 1.01 cm to 0.88 cm. For the Shiyan 3 satellite, the average RMS of SLR residuals improved from 4.95 cm to 4.06 cm.

关键词： GRACE Phase center offset Phase center variations Shiyan 3 Spaceborne GPS

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Design and experimental study of a passive power-source-free stiffness-self-adjustable mechanism

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Frontiers of Mechanical Engineering 2021年第1期16卷 32-45页

作者： yuwang LIU Dongqi WANG Shangkui YANG Jinguo LIU Guangbo HAO State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of SciencesShenyang 110016China Institutes for Robotics and Intelligent Manufacturing Chinese Academy of SciencesShenyang 110169China School of Engineering-Electrical and Electronic Engineering University College CorkCorkIreland

Passive variable stiffness joints have unique advantages over active variable stiffness joints and are currently eliciting increased *** passive variable stiffness joints rely mainly on sensors and special control algorithms,resulting in a bandwidth-limited response speed of the *** propose a new passive power-source-free stiffness-self-adjustable mechanism that can be used as the elbow joint of a robot *** new mechanism does not require special stiffness regulating motors or sensors and can realize large-range self-adaptive adjustment of stiffness in a purely mechanical *** variable stiffness mechanism can automatically adjust joint stiffness in accordance with the magnitude of the payload,and this adjustment is a successful imitation of the stiffness adjustment characteristics of the human *** response speed is high because sensors and control algorithms are not *** variable stiffness principle is explained,and the design of the variable stiffness mechanism is analyzed.A prototype is fabricated,and the associated hardware is set up to validate the analytical stiffness model and design experimentally.

关键词： variable stiffness mechanism stiffness self-regulation bionic robot modeling

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