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| 1 | CSES GNSS ionospheric inversion technique, validation and error analysis显示文摘With the increased number of low Earth orbit(LEO) satellites equipped with global navigation satellite system(GNSS) receiver,the LEO based GNSS slant total electron content(TEC) and electron density profile(EDP) data play an increasingly important role in space weather and ionospheric research due to improved global coverage. China Seismo-Electromagnetic Satellite(CSES), which was launched in February 2018, is equipped with GNSS receiver for either precise orbit determination(POD) and ionospheric inversion. The purpose of the present paper is to validate CSES GNSS ionospheric inversion technique based on the real observations and verify the accuracy of TEC and EDP retrieval based on the simulated data. The following conclusions can be drawn: the epoch difference inversion(EDI) derived from CSES can successfully retrieve the EDPs without non-occultation side measurements; the technique of EDI and the calibrated TEC inversion(CTI) have similar behaviors in inversion errors,however, the retrieved Nm F2 and hm F2 have a larger systematic error surrounding the equatorial ionization anomaly(EIA)where the assumption of spherical symmetry is often invalid; the precision and accuracy of retrieved TEC have been investigated in the paper based on the simulated data, and it is found that the accuracy of the retrieved TEC is relative to solar activity: the lower the F10.7 index, the higher the accuracy of retrieved TEC. | LIN Jian SHEN XuHui HU LiangChen WANG LanWei ZHU FuYing | 2018 | Science China(Technological Sciences)2018，61，5： | 5 |
| 2 | High pressure effects on the crystal structure andelectric conductivity of perovskite like (Ca/Sr)_2CuO_2Cl_2 compounds显示文摘The crystal structure stability as well as electric conductance of (Sr/Ca)_2CuO_2Cl_2 compound with K_2NiF_4 structure was investigated up to 31 GPa using diamond anvil technique. It seems that (Sr/Ca)_2CuO_2Cl_2 is quite stable under pressure but with obvious anisotropic compressibility. The equation of state (EOS) obtained shows relative large bulk modulus. | LIU QingQing WANG FuRen LI FengYing CHEN LiangChen YU RiCheng JIN ChangQing LI YanChun LIU Jing | 2008 | Chinese Science Bulletin2008，53，18： | 2 |
| 3 | Global existence and boundedness of classical solutions to a parabolic-parabolic chemotaxis system显示文摘 | Mu Chunlai Wang Liangchen Zheng Pan | 2013 | Nonlinear Anal Real World Appl2013，14，3： | 1 |
| 4 | Extraction of ocean tidal information based on global equal-area grid and satellite altimeter data显示文摘Harmonic analysis of satellite altimetry data based on a global regular grid is affected by the grid spatial tessellation and placement of the grids.With the increase of latitude,the traditional lat/lon grid deforms greatly,resulting in uneven distribution of satellite altimeter data with latitude,which affects the extraction of tidal information.Alternatively,Hexagonal grids have been proved to be advantageous due to their isotropic,uniform neighbourhood,equal-area and more.Considering the merits above,the purpose of this paper is to use the global equal-area hexagonal grid to conduct a harmonic analysis of satellite altimeter data.First,the Icosahedron Snyder Equal Area projection method is used to construct a global equal-area hexagonal grid,Then the time series data of 19.8 years of Jason series satellite altimeter data are obtained.Finally,the harmonic constants of eight constituents(the M2,S2,N2,K2,K1,O1,P1,Q1)are extracted by harmonic analysis.By analysing the results,we conclude that the harmonic constants extracted from the global equal-area hexagonal grid have considerable accuracy and are consistent with the tidal characteristics of the eight components.Meanwhile,the accuracy of harmonic constants extracted from equal-area hexagonal grids is better than that of lat/lon grids. | Wenbo Wang Huijun Zhou Senyuan Zheng Guonian Lü Liangchen Zhou | 2022 | International Journal of Digital Earth2022，15，1： | 0 |
| 5 | Global Dynamics of a Quasilinear Chemotaxis System with Indirect Signal Production and Generalized Logistic Source显示文摘This paper considers the following quasilinear chemo-taxis system with indirect signal production and generalized logistic source{u_(t)=▽·(▽(u)▽u)-▽·(S(u)▽v)+μ(u-u^(Y)),x∈Ω,t>0 O=△v-v+w,x∈Ω,t>0 w_(t)=-δw+u,x∈Ω,t>0 under homogeneous Neumann boundary conditions in a smooth bounded domainΩ■R^(n)(n≥1),where the parametersμ,δ>0 andγ>1,the functions D(u)and S(u)are supposed to be smooth fulfilling D(u)≥C_(D)(u+1)^(-a)and S(u)≤C_(S)u(u+1)^(β-1)for all u≥0 with C D,α,β∈R and.It is proved that the corresponding initial-boundary value problem possesses a global bounded classical solution ifα+2β<γ-1.Moreover,ifμis suitably large,the asymptotic behavior and convergence rates are also been considered. | YE Xiaobing WANG Liangchen | 2021 | Wuhan University Journal of Natural Sciences2021，26，5： | 0 |
| 6 | Structural Phase Transitions of Iodine at High Pressure显示文摘The compression and polymorphic phase transitions of iodine have been studied by using x-ray diffraction with a diamond anvil cell at high pressure up to 77GPa.Considering that iodine is reactive with iron in air,a corrosion-resisting and high-strength gasket was put between the diamonds,thus the sample can be mounted at atmospheric pressure and room temperature.Pressure was measured in terms of the ruby fluorescence and the molybdenum diffraction as an internal pressure standard.According to the x-ray diffraction results,the iodine undergoes the following three structural phase transitions with pressure increasing:(1)At 21 GPa,from base centred orthorhombic phase(phase Ⅰ)to body centred orthorhombic phase(phase Ⅱ).A 2%change in volume occurs.(2)At 44 GPa,from phase II to body centred tetragonal phase(phase Ⅲ).This is a second order phase transition.(3)At 71 GPa,from phase III to fcc phase(phase Ⅳ).The volume decreases by 3%.At this time,the volume is 45%of the original one at atmospheric pressure. | CHEN Liangchen ZHANG Zhiting CHE Rongzheng YU Tingnan WANG Jifang | 1994 | Chinese Physics Letters1994，11，2： | 0 |
| 7 | Synthesis of boron-doped diamond with laser heated diamond anvil cell显示文摘Boron-doped diamond has been synthesized from graphite mixed with different ratio of B 4 C at high pressure high temperature (HPHT) using laser heated diamond anvil cell.The starting composition was transformed to diamond compound at pressure ~9 GPa,2300-2400 K as indicated by the in-situ X-ray diffraction pattern with synchrotron radiation source.Raman spectrum of the recovered specimen from HPHT state confirmed that boron has been doped into diamond lattice. | ZHANG WeiWei CHEN LiangChen JIN ChangQing WANG XueJin LIU YuYing LIU Jing | 2011 | Chinese Science Bulletin2011，56，13： | 0 |
| 8 | Combined Cycle Fatigue Testing with Ultrasonic FrequencyComponent of S350 Steel Welded Joint显示文摘A combined cycle fatigue (CCF) testing system with ultrasonic frequency component was developed toevaluate the CCF properties of S350 steel welded joints in this study. The fatigue testing results indicated that the S-Ncurves of CCF did not have fatigue limit, which agreed with those of pure high frequency fatigue of welded joints. TheS-N curves showed that the CCF strength of welded joints dropped greatly with the increasing interaction between highand low frequency fatigue loading. An approximation design method of CCF was presented using amplitude envelopeas the stress range. | Liu Yang Wang Dongpo Deng Caiyan Wu Liangchen Yin Danqing Gong Baoming | 2014 | Transactions of Tianjin University2014，20，6： | 0 |
| 9 | Ocean surface currents estimated from satellite remote sensing data based on a global hexagonal grid显示文摘Global ocean surface currents estimated from satellite derived data based on a regular global grid are affected by the grid’s shape and placement.Due to different neighbourhood relationships,the rectangular lat/lon grids lose accuracy when interpolating andfitting elevation data.Hexagonal grids have shown to be advantageous due to their isotropic,uniform neighbourhood.Considering these merits,this paper aims to estimate global ocean surface current using a global isotropic hexagonal grid from satellite remote sensing data.First,gridded satellite altimeter data and wind data with different resolutions are interpolated into the centre of the global isotropic hexagonal grid.Then,geostrophic and Ekman currents components are estimated according to the Lagerlof Ocean currents theory.Finally,the inversion results are verified.By analyzing the results,we conclude that the ocean surface currents estimated based on the global isotropic hexagonal grid have considerable accuracy,with improvement over rectangular lat/lon grids. | Wenbo Wang Huijun Zho Senyuan Zheng Guonian Lu Liangchen Zhou | 2023 | International Journal of Digital Earth2023，16，1： | 0 |
| 10 | Solid C_(60):Pressure Induced Phase Transitions显示文摘Based on in situ high pressure x-ray diffraction with diamond anvil cell by using synchrotron radiation and pressure-quench x-ray measurement,phase transition of C_(60)under high pressured is studied.The maximum pressure used is 30GPa in quasi-hydrostatic case but 44GPa in nonhydrostatic case.At ambient pressure,C_(60)crystal is a fcc phase with lattice parameter a=14.2086Å.It transforms from fcc to a lower symmetry phase at pressure of 13.7GPa,and then transforms to an amorphous state under pressure up to 25-30 GPa.This amorphous state is metastable at normal condition.Finally,the experimental results are discussed. | WANG Jifang WANG Lijun CHEN Liangchen CHEN Hong WANG Ruju ZHANG Zhiting CHE Rongzheng ZHOU Lei | 1993 | Chinese Physics Letters1993，10，3： | 0 |
| 11 | An SEM study on Mullet gill filament material and methods显示文摘The investigation was performed on 4 Mullets (27~49 cm long and weighing 225~1 500 g each) of both sexes from the waters off Tianjin. Small pieces of the gills were sliced and immersionfixed in a buffer mixture of 1.5% glutaraldehyde, 1.5% paraformaldehyde and 0.1 mol/dm3 phosphate for at least 24 h. After fixation in phosphate buffered 1% O?O4 at 4 ℃ for 1 h, the tissues | Wang Liangchen, Cui Tongchang Liu GuoquanDepartment of Biology, Nankai University, Tianjin, China | 1992 | Acta Oceanologica Sinica1992，11，1： | 0 |
| 12 | THE PETROLOGIC CHARACTERISTICS AND THE FORMATION ENVIRONMENT OF THE PALEOKARST BRECCIAS IN THE LOWER REACHES OF THE QINGJIANG RIVER,WESTERN HUBEI显示文摘In the Cambrian-Ordoviclan strata in the lower reaches of the Qingjiang River (western Hubei province), many well-consolidated paleokarst breccia bodies of different sizes and occurrences have been observed. By studying them in detail and by introducing new ideas of modern sedimentology into the study, the authors described and classified these paleokarst breccias. Their forming conditions and mechanisms are also explained on the basis of our research | Shen Jifang Wang Liangchen Wang Zengyin China University of Geoscfences | 1992 | 中国岩溶1992，11，S1： | 0 |
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