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| 1 | Spatial distribution of heavy metals(Cu, Pb, Zn, and Cd)in sediments of a coastal wetlands in eastern Fujian, China显示文摘We investigated the spatial distribution(horizontal and vertical concentrations) of copper(Cu),lead(Pb), zinc(Zn), and cadmium(Cd) in five wetland types(mudflat, aquaculture wetland, water area, farmland wetland and mangrove) from three areas(Ningde, Fuding,and Xiapu), China. Cu concentrations in five wetland types descended in the order: farm wetland, mudflat, aquaculture,water area and mangrove. Pb concentrations decreased in the order: aquaculture, mangrove, farm wetland, mudflat,and water area. Zn content decreased in the order: farm wetland, water area, aquaculture, mudflat and mangrove,and Cd content decreased as follows: mangrove, aquaculture, water area, mudflat, and farm wetland. Comparison of the concentrations of the same heavy metals in different areas showed that the highest Cu(63.75 mg kg^-1) and Zn(152.32 mg kg^-1) concentrations occurred in Ningde coastal wetlands; Pb(110.58 mg kg^-1) and Cd(2.81 mg kg^-1) contents were highest in Fuding wetlands,and the average contents of all heavy metals were very low in Xiapu wetlands. Examination of the vertical distribution showed that the Cu content was high in all mudflat layers;Pb and Cd concentrations were highest in aquaculture and mangrove wetlands, respectively, and Zn content was highest in farm wetlands. The spatial distribution of Cu and Zn contents for different areas decreased as follows:Ningde [ Fuding [ Xiapu, for Pb and Cd were most concentrated in Fuding coastal wetlands. Concentrations of Zn and Cu were highly correlated, while Zn and Cu were not significantly correlated with Pb. | Lili Zhao Weibin You Haiqing Hu Wei Hong Xiaojuan LIAO Shihong Xiao Ren Wang Jinbiao Cai Xuncheng Fan Yong Tan Dongjin He | 2015 | Journal of Forestry Research2015，26，3： | 8 |
| 2 | Optical-terahertz-optical seamless integration system for dual-λ400 GbE real-time transmission at 290 GHz and 340 GHz显示文摘Terahertz band(THz-band,0.3 to 10 THz)communications are envisioned as a promising candidate for 6G and beyond technology,which can provide data capacity tens or even hundreds of Gbps per physical layer link[1-3].Over the past several years,a series of THz communication systems at record-high data rates have undergone significant development,accelerated by electronic and hybrid electronicphotonic techniques[4-9]. | Jiao ZHANG Mingzheng LEI Min ZHU Bingchang HUA Yuancheng CAI Yucong ZOU Liang TIAN Yunwu WANG Jinbiao XIAO Yongming HUANG Jianjun YU Xiaohu YOU | 2023 | Science China(Information Sciences)2023，66，11： | 1 |
| 3 | ON THE FREE VIBRATION OF A SUBMERGED FGM HOLLOW SPHERE显示文摘The free vibration of a functionally graded material hollow sphere submerged in a compress-ible fluid medium is exactly analyzed.The sphere is assumed to be spherically isotropic with material consta-nts being inhomogeneous along the radial direction.By employing a separation technique as well as thespherical harmonics expansion method,the governing equations are simplified to an uncoupled second-orderordinary differential equation,and a coupled system of two such equations.Solutions to these equations aregiven when the elastic constants and the mass density are power functions of the radial coordinate.Numericalexamples are finaUy given to show the effect of the material gradient on the natural frequencies. | Ye Guiru Chen Weiqiu Cai Jinbiao Ding Haojiang | 2000 | Acta Mechanica Solida Sinica2000，13，3： | 1 |
| 4 | A Modified Beam Propagation Method Based on the Galerkin Method with Hermite-Gauss Basis Functions显示文摘A beam propagation method based on the Galerkin method with Hermite-Gauss basis functions for studying optical field propagation in weakly guiding dielectric structures is described. The selected basis functions naturally satisfy the required boundary conditions at infinity so that the boundary truncation is avoided. The paraxial propagation equation is converted into a set of first-order ordinary differential equations, which are solved by means of standard numerical library routines. Besides, the calculation is efficient due to its small resulted matrix. The evolution of the injected field and its normalized power along the propagation distance in an asymmetric slab waveguide and directional coupler are presented, and the solutions are good agreement with those obtained by finite difference BPM, which tests the validity of the present approach. | Xiao Jinbiao Liu Xu Cai Chun Fan Hehong Sun Xiaohan | 2006 | 工程科学(英文版)2006，4，4： | 0 |
| 5 | An improved three-dimensional full-vectorial finite-difference imaginary-distance beam propagation method显示文摘A modified alternating direction implicit approach is proposed to discretize the three-dimensional full-vectorial beam propagation method (3D-FV-BPM) formulation along the longitudinal direction. The cross-coupling terms (CCTs) are neglected at the first sub- step, and then double used at the second substep. The order of two substeps is reversed for each transverse electric field component so that the CCTs are always expressed in an implicit form, thus the calculation is efficient and stable. Based on the multinomial inter- polation, a universal finite difference scheme with a high accuracy is developed to ap- proximate the 3D-FV-BPM formulation along the transverse directions, in which the dis- continuities of the normal components of the electric field across the abrupt dielectric in- terfaces are taken into account and can be applied to both uniform and non-uniform grids. The corresponding imaginary-distance procedure is first applied to a buried rectangular and a GaAs-based deeply-etched rib waveguide. The field patterns and the normalized propagation constants of the fundamental and the first order modes are presented and the hybrid nature of the full-vectorial guided-modes is demonstrated, which shows the validity and utility of the present approach. Then the modal characteristics of the deeply- and shallow-etched rib waveguides based on the InGaAsp/InGaAsP strained multiple quantum wells in InP substrate are investigated in detail. The results are necessary for modeling and the design of the planar lightwave circuits or photonic integrated circuits based on these waveguides. | XIAO Jinbiao LIU Xu CAI Chun FAN Hehong SUN Xiaohan | 2006 | Science in China(Series F)2006，49，4： | 0 |
| 6 | Photonics-assisted THz wireless transmission with air interface user rate of 1-Tbps at 330–500 GHz band显示文摘Air interface user rate(AIUR)of 1-Tbps is one of the most important key performance indicators(KPIs)for the future6G extreme connectivity[1].Terahertz(THz,300 GHz–10 THz)is recognized as a promising candidate technology in achieving the KPI towards Tbps.In the past few years,a series of THz wireless transmissions at recordhigh data rates including both the pure-electronic and photonics-assisted solutions have been demonstrated[2]. | Min ZHU Jiao ZHANG Xiang LIU Bingchang HUA Yuancheng CAI Junjie DING Mingzheng LEI Yucong ZOU Liang TIAN Yunwu WANG Weidong TONG Jinbiao XIAO Yongming HUANG Jianjun YU Xiaohu YOU | 2023 | Science China(Information Sciences)2023，66，9： | 0 |
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