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Study of chemical forms of phosphorus and their bioavailability in the sediments

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Acta Oceanologica Sinica 2004年第2期23卷 317-327页

作者： ZHENGAirong SHENHaiwei LIWenquan departmentofoceanography／InstituteofSubtropicaloceanography XiamenUniversityXiamen361005China GraduateSchoolofoceanography UniversityofRhodeIslandNarragansett02882USA

Chemical forms of phosphorus in the sediments of the Daya Bay, the Zhujiang River estuary , and the xiamen Bay are measured with extraction solutions of MgCl2, NaOH, and HC1. Their availabilities to Chlorella sp. and Isochrysis galbana are estimated by using sediments as the sole source of P in the bioassays. The results show that the contents of total phosphorus (TP) in these sediments are 449.3, 650.1 and 643.9 mg/kg, respectively. The contents of non-apatite inorganic P (NAIP) extracted with MgCl2 and NaOH from 3 sediments are 168.8, 146.6 and 118.1 mg/kg, respectively, and account for 18.3% -32.6% of TP. The phosphorus extracted with HC1 solution is greater than that extracted with NaOH solution and the lowest extracted P is MgCl2-extractable P. The greatest relative growth rates of Chlorella sp. and Isochrysis galbana cultured with sediments are in the range of 4.3% -26.9%. The increasing biomasses of these algae correspond to NAIP and AAPP (the estimated algal-available particulate P). AAPP accounts for 42.4% -78.2% of NAIP, 21.1 % - 27.1% of total inorganic P, and 11.8% - 20.3% of TP, respectively.

关键词： chemical forms phosphorus bioavailability,sediment

An eigenfunction expansion method for the elastodynamic response of an elastic solid with mixed boundary surfaces

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Progress in Natural Science:Materials International 2008年第9期18卷 1063-1068页

作者： Liguo Tang a,b,*, Jianchun Cheng c a department of oceanography, xiamen university, xiamen 3.1005, china b Key Laboratory of Underwater Acoustic Communication, and Marine Information Technology, Ministry of Education, xiamen university, xiamen 3.1005, china c Laboratory of Modern Acoustics and Institute of Acoustics, Nanjing university, Nanjing 210093, china department of oceanography Xiamen University Xiamen 361005 China Key Laboratory of Underwater Acoustic Communication and Marine Information Technology Ministry of Education Xiamen University Xiamen 361005 China Laboratory of Modern Acoustics and Institute of Acoustics Nanjing University Nanjing 210093 China

The method of eigenfunction expansion is one of the most elegant methods for solving elastodynamic problems. The solution obtained from it is more concise than that obtained from the integral transform technique. Traditional eigenfunction expansion method is used for the elastodynamic problems with displacement and traction boundary conditions. In this paper, the method is generalized to study the elastodynamic response of an elastic solid with mixed boundary surfaces, and the exact analytical solution is derived. The dynamic response of a finite-length solid aluminum cylinder with two mixed end boundaries is numerically evaluated. The result com- puted from the analytical solution agrees very well with that obtained from finite element method (FEM).

关键词： Eigenfunction expansion Elastodynamic response Mixed boundary

Sodium current of neurosecretory cells in the eyestalk from the shrimp Penaeus japonicus

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Progress in Natural Science:Materials International 2009年第11期19卷 1493-1499页

作者： Jinshen Liu~a,Shiying Li~b,Haihui Ye~(a,*),Guizhong Wang~c a department of oceanography,xiamen university,xiamen 3.1005,china b xiamen Institute of Medicine,xiamen 361003,china c State Key Laboratory of Marine Environment Science,xiamen 3.1005,china [a]department of oceanography Xiamen University Xiamen 361005 China [b]xiamen Institute of Medicine Xiamen 361003 China [c]State Key Laboratory of Marine Environment Science Xiamen 361005 China

The properties of the inward current of medulla terminalis-X-organ(MTXO) cells isolated from the Penaeus japonicus eyestalk were studied with the whole-cell clamp technique in the presence of Ca2+and K~+ channel *** inward currents had a threshold at about -50 mV and peaked at -10 *** reversed potential(Vrev) was very close to VNa,the theoretical Nernst equilibrium potential for Na~+.Vrevfollowed VNawhen the external Na~+ concentration was varied and the currents were entirely suppressed by 30 nM tetrodotoxin (TTX),indicating that it was carried by Na~+.The smooth line of concentration-dependent inhibition of sodium currents by TTX represented the best fit with the Hill equation,yielding an IC50of 2.1±0.1 *** values of the half-maximal activation voltage Vhwere -20.6±0.5 and -19.3±0.5 mV,respectively,in the absence and presence of 2 nM *** had no significant effect on the voltage dependence of steady-state activation and inactivation of *** together,the results suggest that the inward current recorded under our experimental conditions was carried by sodium ions flowing through fast voltage-dependent Na~+ channels.

关键词： MTXO Sodium current Penaeus japonicus Patch-clamp

Change of upwelling over Southern Fujian-Taiwan Shoal Fishing Ground and its relation to the fisheries

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Acta Oceanologica Sinica 1989年第3期8卷 462-464页

作者： He Faxiangdepartment of oceanography, xiamen university, xiamen, china

On the basis of the temperature and salinity survey data of July, 1975 and the historical da-ta of relevant hydrological and meteorological stations, this paper discusses the change patternand cause of the upwelling and its relation to the fisheries in the Southern Fujian-Taiwan ShoalFishing Ground. Being important for the benefit of fisheries, the above points have received

关键词： EI data Change of upwelling over Southern Fujian-Taiwan Shoal Fishing Ground and its relation to the fisheries Nino over

REMOVABLE EARS OF 1-EXTENDABLE GRAPHS

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Journal of Systems Science & Complexity 2010年第2期23卷 372-378页

作者： Shaohui ZHAI Xiaofeng GUO department of Mathematics and Physics Xiamen University of Technology Xiamen 361024 China. School of Mathematical Sciences Xiamen University Xiamen 361005 China.

Carvalho, Lucchesi and Murty proved that any 1-extendable graph G different from K2 and C2n has at least A（G） edge-disjoint removable ears, and any brick G distinct from K4 and C6 has at least A（G） - 2 removable edges, where A（G） denotes the maximum degree of G. In this paper, we improve the lower bounds for numbers of removable ears and removable edges of 1-extendable graphs. It is proved that any 1-extendable graph G different from K2 and C2n has at least x′（G） edge-disjoint removable ears, and any brick G distinct from Ka and Ce has at least x′（G） - 2 removable edges, where x′（G） denotes the edge-chromatic number of G. Key words 1-extendable graphs, removable ear, removable edge.

关键词： 1-extendable graphs removable ear removable edge.

Further decomposition for singular systems and its properties on geometric subspace

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控制理论与应用（英文版） 2010年第3期8卷 293-300页

作者： Jianxiong YANG, Maoqing LI (department of Automation, xiamen university, xiamen Fujian 3.1005, china) department of Automation Xiamen University Xiamen Fujian China

This paper focuses on the relationship between the geometric subspaces and the structural decomposition of continuous-time singular systems. The original structural decomposition is not capable of revealing explicitly the invariant geometric subspaces for singular systems. As such, a further decomposition is necessary and is thus investigated in this paper. Under a new decomposition proposed, the supremal output-nulling （A, E, ImB）-invariant subspace of singular systems can be clearly expressed in an explicit form, and some of its applications are also addressed.

关键词： Singular systems Structural demonstration Geometric subspaces

Studies on the role of marine bacteria in the upwelling ecosystem——Ⅰ.Bacterial biomass in the upwelling regions

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Acta Oceanologica Sinica 1993年第2期12卷 261-272页

作者： Zheng Tianling, Cai Lizhe and Jiang Xianquan Environmental Science Research Center, xiamen university, xiamen 3.1005, china department of oceanography, xiamen university, xiamen 3.1005, china

-Six cruises were carried out off the south bank of Fujian - Taiwan during the period of December 21, 1987 to November 15, 1988 to estimate the contribution of bacterial biomass carbon (BBC) to the totai particulate organic pools using epifluorescent microscopic technique. The results show that the standing crop of bacteria fluctuated from 0. 95 to 66. 60 mg /m3 (dry weight). Upwelling phenomena appeared in the region around Nanpeng Island in summer while in the region of Waixie in all seasons. The average value of BBC was 27. 60(±6. 08)mg/m3and 21. 32 (±2. 34) mg/m3 respectively. The seasonal and spatial distribution is discussed in relation to environmental factors as well as upwelling phenomena. The role of bacteria in the flow of material and energy in the upwelling ecosystem is emphasized.

关键词： Marine bacteria upwelling ecosystem

Maximal possible accretion rates for slim disks

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Science china(Physics,Mechanics & Astronomy) 2009年第12期52卷 2054-2058页

作者： LIN YiQing1 & JIAO ChengLiang2 1 department of Mathematics and Physics,xiamen university of Technology,xiamen 361024,china 2 department of Physics and Institute of Theoretical Physics and Astrophysics,xiamen university,xiamen 3.1005,china 1. department of Mathematics and Physics Xiamen University of Technology Xiamen 361024 China 2. department of Physics and Institute of Theoretical Physics and Astrophysics Xiamen University Xiamen 361005 China

It was proved in the previous work that there must be a maximal possible accretion rate $ \dot M_{max} $ for a slim disk. Here we discuss how the value of $ \dot M_{max} $ depends on the two fundamental parameters of the disk, namely the mass of the central black hole M and the viscosity parameter α. It is shown that $ \dot M_{max} $ increases with decreasing α, but is almost independent of M if $ \dot M_{max} $ is measured by the Eddington accretion rate $ \dot M_{Edd} $ , which is in turn proportional to M.

关键词： accretion disks black hole physics hydrodynamics

Multitarget Detection Using a Hybrid Optical Joint Transform Correlator with Power Spectrum Subtraction

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Chinese Journal of Lasers 1999年第2期8卷 30-35页

作者： ZHOU Haiguang HUANG Xianlie LAI Hongkai GAO Zehua (department of Physics, xiamen university, xiamen 3.1005, china) 厦门大学物理系福建厦门 361005 厦门大学物理系福建厦门

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１ＩｎｔｒｏｄｕｃｔｉｏｎＦｏｒｍｕｌｔｉｔａｒｇｅｔｄｅｔｅｃｔｉｏｎ，ｔｈｅｊｏｉｎｔｔｒａｎｓｆｏｒｍｃｏｒｅｌａｔｏｒ（ＪＴＣ）ｉｓａｎｅｘｔｒｅｍｅｌｙｕｓｅｆｕｌａｒｃｈｉｔｅｃｔｕｒｅ［１］．ＨｏｗｅｖｅｒｔｈｅｃｌａｓｉｃａｌＪＴＣｐ...

关键词： optical pattern recognition joint transform correlator multitarget detection powers pectrum subtraction