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Microstructure and Wear Properties of Laser Coating Reinforced by Ti(C_xN_(1-x)) on Adamite Roller

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Journal of Iron and Steel Research International 2009年第3期16卷 78-82,88页

作者： QI Yong-tian ZOU zeng-da School of Material Science and Engineering Shandong University Jinan 250061 Shandong China

Fe-based layer with Ti（CxN1-x） particulates on Adamite roller surface was obtained by a 5 kW traverse-flowing CO2 laser cladding technology. The microstructures of the layer were detected by optical microscopy （OM）,X-ray diffraction （XRD）,scanning electron microscopy （SEM）,and electron probe microscopy analysis （EMPA）. The tests of wear resistance was carried out on the test machine. It was seen that a good metallurgical bonding between the coating and the substrate was achieved. The microstructure contains bulky dendritic crystal and small size Ti（CxN1-x） grains that are uniformly distributed in the solid solution matrix. The wear tests showed that the laser coating provided an excellent wear resistance property at room temperature.

关键词： Ti(CxN1-x) laser cladding in-situ formation adamite roller

Control of fractional chaotic and hyperchaotic systems based on a fractional order controller

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Chinese Physics B 2014年第8期23卷 274-284页

作者： Li tian-zeng Wang Yu Luo Mao-Kang College of Mathematics Sichuan University Chengdu 610065 China Sichuan Province University Key Laboratory of Bridge Non-destruction Detecting and Engineering Computing School of Science Sichuan University of Science and Engineering Zigong 643000 China

We present a new fractional-order controller based on the Lyapunov stability theory and propose a control method which can control fractional chaotic and hyperchaotic systems whether systems are commensurate or incommensurate. The proposed control method is universal, simple, and theoretically rigorous. Numerical simulations are given for several fractional chaotic and hyperchaotic systems to verify the effectiveness and the universality of the proposed control method.

关键词： fractional-order chaotic system chaos control fractional-order controller hyperchaos

Bosonic Halperin(441)Fractional Quantum Hall Effect at Filling Factorν=2/5

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Chinese Physics Letters 2022年第1期39卷 21-26页

作者： tian-Sheng zeng Liangdong Hu WZhu Department of Physics School of Physical Science and TechnologyXiamen UniversityXiamen 361005China Zhejiang University Hangzhou 310027China School of Science Westlake UniversityHangzhou 310024China Key Laboratory for Quantum Materials of Zhejiang Province School of ScienceWestlake UniversityHangzhou 310024China

Quantum Hall effects with multicomponent internal degrees of freedom facilitate the playground of novel emergent topological ***,we explore the correlated topological phases of two-component hardcore bosons at a total filling factorν=2/5 in topological lattice models under the interplay of intracomponent and intercomponent *** give the numerical demonstration of the emergence of Halperin(441)fractional quantum Hall effect based on exact diagonalization and density-matrix renormalization group *** elucidate its topological features including the degeneracy of the ground state,fractionally quantized topological Chern number matrix and chiral edge modes.

关键词： methods. topological fractional

Entanglement Transfer Between Cavity Fields and Excitons in a Driven Quantum Dot System

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Communications in Theoretical Physics 2007年第4X期48卷 645-648页

作者： zeng tian-Hai SHAO Bin ZOU Jian Department of PhysiCs Beijing Institute of Technology Beijing 100081 China

We investigate entanglement transfer from two separate cavities to the excitons in two quantum dots separately placed in the two cavities. The cavity fields and the excitons are treated as two continuous-variable （CV） subsystems. The time-dependent characteristic functions in the Wigner representation for the two subsystems are analytically obtained. Under the conditions that one of the two CV subsystems is initially prepared in a two-mode squeezed vacuum state and the other in its lowest energy state, we show that the entanglement reciprocation between the cavity fields and the excitons is realizable.

关键词： entanglement transfer quantum dot logarithmic negativity

Influence of Intrinsic Decoherence on Entanglement in Two-Qubit Quantum Heisenberg XYZ Chain

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Communications in Theoretical Physics 2005年第2X期44卷 255-258页

作者： SHAO Bin zeng tian-Hai ZOU Jian Department of Physics Beijing Institute of Technology Beijing 100081 China

Taking the intrinsic decoherence effect into account, we investigate the time evolution of entanglement for two-qubit XYZ Heisenberg model in an external uniform magnetic field. Concurrence, the measurement of entanglement,is calculated. We show how the intrinsic decoherence modifies the time evolution of the entanglement and find that at short-time case, concurrence is oscillating as increasing magnetic field, which implies that entanglement may be enhanced or weakened in some time regions.

关键词： entanglement intrinsic decoherence Heisenberg chain

Current and emerging immunotherapeutic approaches for biliary tract cancers

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Hepatobiliary & Pancreatic Diseases International 2022年第5期21卷 440-449页

作者： Zhen-Gang Yuan tian-Mei zeng Chen-Jie Tao Department of Oncology Eastern Hepatobiliary Surgery HospitalSecond Military Medical University(Navy Medical University)Shanghai 200438China

Background:Biliary tract cancers(BTCs)comprise a heterogeneous group of aggressive malignancies with unfavorable *** benefit of chemotherapy seems to have reached a bottleneck and,therefore,new effective therapeutic strategies for advanced BTCs are *** targeted therapies in selected patients are rapidly changing the ***,the low frequency of specific driver alterations in BTCs limits their wide ***,immunotherapeutic approaches are also under active investigation in BTCs,but the role of immunotherapy in BTCs remains *** sources:Pub Med,Web of Science,and meeting resources were searched for relevant articles published from January 2017 to May *** search aimed to identify current and emerging immunotherapeutic approaches for *** on clinical trials was obtained from https://***/and http://***/.Results:Immunotherapy in BTC patients is currently under investigation,and most of the investigations focused on the application of immune checkpoint inhibitors(ICIs).However,only a subgroup of BTCs with microsatellite-instability high(MSI-H)/DNA mismatch repair-deficient(d MMR)or tumor mutational burden-high(TMB-H)benefit from monotherapy of ICIs,and limited activity was observed in the second or subsequent ***,promising results come from studies of ICIs in combination with other therapeutic approaches,including chemotherapy,in advanced BTCs,with a moderate toxicity *** studies demonstrated that compared to GEMCIS alone,durvalumab plus GEMCIS significantly improved patient survival(TOPAZ-1 trial)and that ICIs-combined chemoimmunotherapy is poised to become a new frontline therapy option,regardless of TMB and MMR/MSI *** cell therapy and peptide-or dendritic-based cancer vaccines are other immunotherapeutic options that are being studied in *** biomarkers have been investigated to define their predictive role in res

关键词： Biliary tract cancer Cholangiocarcinoma Gallbladder cancer Immunotherapy Immune checkpoint inhibitors

Uncombined precise orbit and clock determination of GPS and BDS-3

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Satellite Navigation 2020年第1期1卷 206-216页

作者： tian zeng Lifen Sui Rengui Ruan Xiaolin Jia Laiping Feng Information Engineering University Zhengzhou 450001People’s Republic of China State Key Laboratory of Geo-Information Engineering Xi’an 710054People’s Republic of China Xi’an Research Institute of Surveying and Mapping Xi’an 710054People’s Republic of China

There is increasing concern about the uncombined(UC)observation model in the field of global navigation satellite system(GNSS).Based on the global positioning system(GPS)and the third-generation BeiDou navigation satellite system(BDS-3),this study processed the UC precision orbit determination(POD)for single and dual ***,a UC observation model suitable for multi-GNSS POD was derived,and the ionospheric-free(IF)combination observation model was *** the ambiguity parameters of UC and IF strategies were different after reparameterization,the difference could be removed when processing ambiguity resolution,and the equivalence was proved *** demonstrate the accuracy of BDS-3 orbits fully,the observation data of approximately 1 month were selected for determining the precise orbit for global positioning system(GPS)only,BDS-3 only,and GPS/BDS-3 systems based on the UC and IF *** orbit precision of BDS-3 satellites was validated by using metrics,including comparison with precision products released by Wuhan University,orbit boundary discontinuity,and satellite laser ranging(SLR)*** results show that the orbit accuracies of the IF and UC models are almost the same,the difference in orbits is approximately several millimeters,and the clock difference is within 0.01 *** GPS/BDS-3 combined solution shows better accuracy compared to other *** average accuracies in the R and 3D directions are approximately 4 and 15 cm,and the clock standard deviation is approximately 0.2 ns compared to external orbit *** root mean square of SLR residuals is approximately 4 cm.

关键词： Precise orbit determination GPS BDS-3 Uncombined model Ionospheric-free combination

An efficiency algorithm on Gaussian mixture UKF for BDS/INS navigation system

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Geodesy and Geodynamics 2018年第2期9卷 169-174页

作者： Qing Dai Lifen Sui Lingxuan Wang tian zeng Yuan tian Dept.Spatial Information Information Engineering University

To further improve the performance of UKF(Unscented Kalman Filter) algorithm used in BDS/SINS(BeiDou Navigation Satellite System/Strap down Inertial Navigation System), an improved GM-UKF(Gaussian Mixture Unscented Kalman Filter) considering non-Gaussian distribution is discussed in this paper. This new algorithm using SVD(Singular Value Decomposition) is proposed to alternative covariance square root calculation in UKF sigma point production. And to end the rapidly increasing number of Gaussian distributions, PDF(Probability Density Function) re-approximation is conducted. In principle this efficiency algorithm proposed here can achieve higher computational speed compared with traditional GM-UKF. And simulation experiment result show that, compared with UKF and GM-UKF algorithm, new algorithm implemented in BDS/SINS tightly integrated navigation system is suitable for handling nonlinear/non-Gaussian integrated navigation position calculation, for its lower computational complexity with high accuracy.

关键词： Gaussian mixture UKF Singular Value Decomposition Integrated navigation Time complexity

A New Flavone Glycoside from Epimedium koreanum

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Chinese Chemical Letters 2006年第10期17卷 1328-1330页

作者： Hai Yan ZHANG tian zeng ZHAO Wei Ping YIN Ming Jian WU Chemistry Department Zhengzhou University Zhengzhou 450052 Key Laboratory of Natural Products Henan Academy of Science Zhengzhou 450002 Chemical Engineering ＆ Pharmaceutics College Henan University of Science and Technology Luoyang 471003

A novel flavone glycoside named 3＇＇＇-carbonyl-2＇＇-β-L-quinovosyl icariside Ⅱ was isolated from the aerial parts of Epimedium koreanum. Its chemical structure was elucidated on the basis of spectral analysis.

关键词： Epimedium koreanum aerial parts flavone glycoside 3'''-carbonyl-2'''-β-L-quinovosylicariside II.