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Quality assessment of onboard GPS receiver and its combination with DORIS and SLR for Haiyang 2A precise orbit determination

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Science China Earth Sciences 2015年第1期58卷 138-150页

作者： GUO jing ZHAO QiLe GUO Xiang LIU XiangLin LIU jingNan ZHOU quan GNSS Research Center Wuhan University School of Geodesy and Geomatics Wuhan University Fugro Intersite B.V. Leidschendam 2263HWNetherlands Collaborative Innovation Center of Earth and Space Science Wuhan University Test and Assessment Research Center China Satellite Navigation Office

The GPS,DORIS,and SLR instruments are installed on Haiyang 2A(HY2A)altimetry satellite for Precise Orbit Determination(POD).Among these instruments,the codeless GPS receiver is the state-of-art Chinese indigenous onboard receiver,and it is the first one successfully used for Low Earth Orbit(LEO)***,the contribution assesses the performance of the receiver through an analysis of data integrity,numbers of all tracked and valid measurements as well as multipath *** receiver generally shows good performance and quality despite a few *** example,L2 observations are often missing in low elevations,particularly during the ascent of GPS satellites,and the multipath errors of P1 show a slightly abnormal ***,the PCO(Phase Center Offset)and PCV(Phase Center Variation)of the antenna of the GPS receiver are determined in this contribution.A significant leap for Z-component of PCO up to-1.2 cm has been found on 10 October ***,the obtained PCO and PCV maps are used for GPS only POD *** post-fit residuals of ionosphere-free phase combinations reduce almost 50%,and the radial orbit differences with respect to CNES(Centre National d’Etudes Spatiales)Precise Orbit Ephemeris(POEs)improve about 13.9%.The orbits are validated using the SLR data,and the RMS of SLR Observed minus Computed(O-C)residuals reduces from 17.5 to 15.9 *** improvements are with respect to the orbits determined without PCO and ***,six types of solutions are determined for HY2A satellite using different combinations of GPS,DORIS,and SLR *** of SLR O-C residuals and cross-comparison of orbits obtained in the contribution and the CNES POEs indicate that the radial accuracy of these orbits is at the 1.0 cm level for HY2A orbit solutions,which is much better than the scientific requirements of this *** is noticed that the GPS observations dominate the achievable accuracy of POD,and the combination of multiple types of observation

关键词： Haiyang 2A GPS receiver multipath precise orbit determination phase center offset phase center variations DORIS SLR

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ANALYTICAL RESEARCH ON THE WAVE DIFFRACTION OF ARC-SHAPED FLOATING BREAKWATERS

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Journal of Hydrodynamics 2006年第1期18卷 1-10页

作者： MIAO Guo-ping CHENG Jian-sheng WANG jing-quan YOU Yun-xiang School of Naval Architecture Ocean and Civil Engineering Shanghai Jiaotong University Shanghai 200030 China Engineering Institute of Engineering Corps PLA University of Science and Technology Nanjing 210007 China

An analytical method was developed to study the wave diffraction on are-shaped floating breakwaters. The floating breakwater was assumed to be rigid, thin, vertical, immovable and located in water of constant depth. The fluid domain was divided into two regions by imaginary interface, The velocity potential in each region is expanded by eigenfunctions. By satisfying continuity of pressure and normal velocity across the imaginary fluid interface, a set of linear algebraic equations could be obtained to determine the unknown coefficients for eigenfunctions. The accuracy of present model and the computer program were verified by a comparison with ex isting results for the case of arc-shaped bottom-mounted breakwaters. Numerical results, in the form of contour maps of the non-dimension wave amplitude around the breakwater, were presented for a range of wave and breakwater parame ters. Results show the wave diffraction on the arc-shaped floating breakwater is related to the incident wavelength and the draft of the breakwater.

关键词： arc-shaped floating breakwater wave diffraction velocity potential eigenfunctions

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WAVE DIFFRACTION ON ARC-SHAPED BOTTOM-MOUNTED BREAKWATERS

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Journal of Hydrodynamics 2005年第4期17卷 391-397页

An analytical method was developed to study the wave diffraction effects on arc-shaped bottom-mounted breakwaters. The breakwater was assumed to be rigid, thin, impermeable and vertically located in water of constant depth. The fluid domain was divided into two regions by imaginary cylindrical interface. The velocity potential in each region was expanded with cigcnfunctions. By satisfying continuity of pressure and normal velocity across the imaginary fluid interface, a set of linear algebraic equations could be obtained to determine the unknown coefficients for eigenfunction expansions. The accuracy of the present model was verified by a comparison with existing results for the case of an isolated straight-line breakwater. Numerical results, in the form of contour maps of the non-dimensional wave amplitude around the breakwater and diffracted wave amplitude at three typical sections, were presented for a range of wave parameters. Results show the arc-shaped bottom-mounted breakwater is generally effective in defending against waves. The wave amplitudes at most sheltered areas are commonly 10%-50% of incident wave amplitudes under most wave conditions.

关键词： arc-shaped breakwater wave diffraction velocity potential eigenfunction

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Management of hepatocellular carcinoma patients with portal vein tumor thrombosis:A narrative review

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Hepatobiliary & Pancreatic Diseases International 2022年第2期21卷 134-144页

作者： Zi-Wen Tao Bao-quan Cheng Tao Zhou Yan-jing Gao Department of Gastroenterology Qilu HospitalCheeloo College of MedicineShandong UniversityJinan 250012China

Background: Hepatocellular carcinoma(HCC) is one of the main reasons for malignancy-related death. Portal vein tumor thrombosis(PVTT) is the most common form of macrovascular invasion related to HCC occurring in 10%-60% of patients. HCC with PVTT is usually characterized by worsening liver function, vulnerability to blood metastasis, higher incidence of complications associated with portal hypertension, and intolerance to treatment when compared with that without PVTT. If only treated with supportive care, the median survival of HCC with PVTT is about 2.7 months. In the past, sorafenib was the only recommended therapy by guidelines with limited effectiveness. This narrative review aimed to describe the current management options for HCC with PVTT. Data sources: We have reviewed literature from Pub Med on the treatment of HCC with PVTT and compiled evidence-based facts on effective therapies available for different types of PVTT. Results: Sorafenib monotherapy is not much effective, but combining it with other methods can improve survival. Each type of PVTT can beneft from the combination of transarterial chemoembolization and sorafenib than sorafenib monotherapy. The tumor downstaging can be realized possibly after transarterial chemoembolization, but tumor invasion into the main trunk of the portal vein greatly impairs efficacy. Although surgery is a curative approach, it is often not recommended for Vp4 PVTT. Some new methods can broaden the indication, but further explorations are needed. Radiotherapy can decrease the possibility of Vp3 progression to Vp4, but building a forecast model of best radiation dose and response is necessary. Systemic chemotherapy, hepatic arterial infusion chemotherapy, radiofrequency ablation, portal stenting, and traditional Chinese medicine are also benefcial in Vp3-4 PVTT. The accurate diagnosis of PVTT can be made by radiomics, and prognostic classifcation models can be used to design personalized treatments. The application of new

关键词： Hepatocellular carcinoma Portal vein tumor thrombosis Transarterial chemoembolization Radiotherapy Surgery Sorafenib

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AquaSee: Predict Load and Cooling System Faults of Supercomputers Using Chilled Water Data

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Journal of Computer Science & Technology 2020年第1期35卷 221-230页

作者： Yu-Qi Li Li-quan Xiao jing-Hua Feng Bin Xu Jian Zhang National Supercomputer Center in Tianjin Tianjin 300450China College of Computer National University of Defense TechnologyChangsha 410073China

An analysis of real-world operational data of Tianhe-1A(TH-1A)supercomputer system shows that chilled water data not only can reflect the status of a chiller system but also are related to supercomputer *** study proposes AquaSee,a method that can predict the load and cooling system faults of supercomputers by using chilled water pressure and temperature *** method is validated on the basis of real-world operational data of the TH-1A supercomputer system at the National Supercomputer Center in *** with various compositions are used to construct the prediction model,which is also established using different prediction sequence *** results show that the method that uses a combination of pressure and temperature data performs more effectively than that only consisting of either pressure or temperature *** best inference sequence length is two ***,an anomaly monitoring system is set up by using chilled water data to help engineers detect chiller system anomalies.

关键词： supercomputer chilled water data sensor network load prediction

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SP3-coupled global variance reduction method based on RMC code

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Nuclear Science and Techniques 2021年第11期32卷 42-51页

作者： Qing-quan Pan Teng-Fei Zhang Xiao-jing Liu Hui He Kan Wang School of Nuclear Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Department of Engineering Physics Tsinghua UniversityBeijing 100084Chin

A global variance reduction(GVR)method based on the SPN method is ***,the global multi-group cross-sections are obtained by Monte Carlo(MC)global ***,the SP3 equation is solved to obtain the global flux ***,the global weight windows are approximated by the global flux distribution,and the GVR simulation is *** GVR method is implemented as an automatic process in the RMC *** SP3-coupled GVR method was tested on a modified version of C5 G7 benchmark with a thickened water *** results show that the SP3-coupled GVR method can improve the efficiency of MC criticality calculation.

关键词： RMC code Global homogenization Variance reduction SPN theory

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Solid-liquid transition induced by the anisotropic diffusion of colloidal particles

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Chinese Physics B 2022年第3期31卷 449-454页

作者： Fu-Jun Lin jing-jing Liao Jian-Chun Wu Bao-quan Ai Guangdong Provincial Key Laboratory of quantum Engineering and quantum Materials Guangdong-Hong Kong Joint Laboratory of Quantum MatterSchool of Physics and Telecommunication Engineering South China Normal UniversityGuangzhou 510006China School of Science Jiangxi University of Science and TechnologyGanzhou 341000China

We numerically study the phase behaviors of colloids with anisotropic diffusion in two dimensions. It is found that the diffusion anisotropy of colloidal particles plays an important role in the phase transitions. A strong diffusion anisotropy induces the large vibration of particles, subsequently, the system goes into a disordered state. In the presence of the strong-coupling, particles with weak diffusion anisotropy can freeze into hexagonal crystals. Thus, there exists a solid-liquid transition. With the degree of diffusion anisotropy increasing, the transition points are shifted to the strongercoupled region. A competition between the degree of diffusion anisotropy and coupling strength widens the transition region where the heterogeneous structures coexist, which results in a broad-peak probability distribution curve for the local order parameter. Our study may be helpful for the experiments related to the phase behavior in statistical physics, materials science and biophysical systems.

关键词： phase transition anisotropic diffusion colloidal particles

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Influence of Regular Wave and Ship Characteristics on Mooring Force Prediction by Data-Driven Model

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China Ocean Engineering 2020年第4期34卷 589-596页

作者： LIU Bi-jin CHEN Xiao-yun ZHANG You-quan XIE jing CHANG Jiang School of Civil Engineering and Architecture Xiamen University of TechnologyXiamen 361024China Fujian Marine Forecasts Fuzhou 350003China Tianjin Research Institute for Water Transport Engineering Tianjin 300456China Tianjin Survey and Design Institute for Water Transport Engineering Tianjin Key Laboratory of Surveying and Mapping for Waterway Transport EngineeringTianjin 300456China

The study of mooring forces is an important issue in marine engineering and offshore *** being widely applied in mooring system,numerical simulations suffer from difficulties in their multivariate and nonlinear ***-driven model is employed in this paper to predict the mooring forces in different lines,which is a new attempt to study the mooring *** height and period of regular wave,length of berth,ship load,draft and rolling period are considered as potential influencing *** variables are determined using mutual information(MI)and principal component analysis(PCA),and imported to an artificial neural network(NN)model for *** study case of 200 and 300 thousand tons ships experimental data obtained in Dalian University of Technology,MI is found to be more appropriate to provide effective input variables than *** the three factors regarding ship characteristics are highly correlated,it is recommended to input all of them to the NN *** accuracy of predicting aft spring line force attains as high as 91.2%.The present paper demonstrates the feasibility of MI-NN model in mapping the mooring forces and their influencing factors.

关键词： mooring force characteristics of ship neural network mutual information principal component analysis

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Synthesis, Structure, Fluorescence and Magnetic Properties of a New Binuclear Cobalt (Ⅱ) Complex Containing Three Kinds of Ligands

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Chinese Journal of Structural Chemistry 2020年第6期39卷 1070-1076页

作者： FENG Yu-quan ZHONG Zhi-Guo LI jing College of Chemistry and Pharmacy Engineering Nanyang Normal UniversityNanyang 473061China

A new binuclear cobalt(Ⅱ)complex,[Co2(C10H6NO2)2(C12H8N2)2(N3)2]·H2O(1,C10H6NO2-:isoquinoline-1-carboxylate,C12H8N2:1,10-phenanthroline(phen);N3-:azide),has been synthesized though a mixed-solvothermal method using the pentanol and distilled water as *** complex was characterized by elemental analysis,IR spectrum and single-crystal X-ray *** crystallizes in triclinic system,space group P1 with Z=2,a=1.777(5),b=11.815(5),c=17.141(7)?,α=74.496(6)°,β=70.537(6)°,γ=67.861(6)°,V=2055.4(14)?3,Mr=922.66,Dc=1.491 g/cm3,λ=0.71073?,μ=0.870 mm-1,F(000)=942,R=0.0455 and wR=0.1147 for 4960 observed reflections with I>2σ(I)and S=*** molecular structure is constructed by two Co2+cations,two chelating phen ligands,two chelating isoquinoline-1-carboxylate ligands,two bridging linear azide anions and two uncoordinated half-occupied water *** 3-D supramolecular network results from the multiple hydrogen bonds andπ-πstacking interactions among three types of *** importantly,its thermal stability,luminescent properties and magnetic properties have also been studied in detail.

关键词： binuclear cobalt(Ⅱ)complex thermal stability fluorescence decay magnetic properties

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Transport of velocity alignment particles in random obstacles

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Chinese Physics B 2018年第8期27卷 164-169页

作者： Wei-jing Zhu Xiao-qun Huang Bao-quan Ail Guangdong Provincial Key Laboratory of quantum Engineering and quantum Materials School of Physics and Telecommunication EngineeringSouth China Normal University Basic Teaching Department Neusoft Institute Guangdong

We numerically investigate the trapping behaviors of aligning particles in two-dimensional （2D） random obstacles system. Under the circumstances of the effective diffusion rate and the average velocity tend to zero, particles are in trapped state. In this paper, we examine how the system parameters affect the trapping behaviors. At the large self-propelled speed, the ability of nematic particles escape from trapping state is enhancing rapidly, in the meanwhile the polar and free particles are still in trapped state. For the small rotation diffusion coefficient, the polar particles circle around （like vortices） the obstacles and here particles are in trapped state. Interestingly, only the partial nematic particles are trapped in the confined direction and additional particles remain flowing. In the free case, the disorder particle-particle collisions impede the motion in each other＇s directions, leading the free particles to be trapped. At the large rotation diffusion coefficient, the ordered motion of aligning particles disappear, particles fill the sample evenly and are self-trapped around obstacles. As the particles approach the trapping density due to the crowding effect the particles become so dense that they impede each other＇s motion. With the increasing number of obstacles, the trajectories of particles are blocked by obstacles, which obstruct the movement of particles. It is worth noting that when the number of the obstacles are large enough, once the particles are trapped, the system is permanently absorbed into a trapped state.

关键词： Brownian motion self-propelled particles stochastic processes

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