中国鲎幼体阶段(黄皮鲎)饵料的初步研究

用杂鱼、星虫、牡蛎、乌贼、虾进行中国鲎幼体饵料种类、粒度以及白天和夜间摄食量差异等试验。结果表明：中国鲎幼体阶段(黄皮鲎)对乌贼的相对摄食量最大(2.1％)，而对小杂鱼的相对摄食量最少(0．2％)。中国鲎幼体阶段(黄皮鲎)均对粒度为0.3～0．5cm的乌贼相对摄食量最大(2．0％)，对粒度为2cm的乌贼相对摄食量最小(0．1％)。中国鲎幼体阶段(黄皮鲎)夜晚的摄食量明显大于白天：平均体重为147．4g组的昼夜相对摄食量的差异最大(白天为0．8％，夜间为1．7％)，平均体重为258．7g组的差异最小(白天为ll％，夜间为l4％)。     

氟苯尼考在九孔鲍体内的药代动力学初步研究

初步研究了新型抗菌兽药氟苯尼考(florfenicol)在健康九孔鲍体内的药代动力学特征;建立了高效液相色谱法(HPLC)检测鲍血淋巴中氟苯尼考含量的可靠方法,平均回收率为85.69%,最低检测限0.05μg/cm3.以20×10-6(m/m)剂量对九孔鲍腹足单次肌注,血药浓度-时间数据用非房室模型的统计矩原理(SMT)处理后的主要药代动力学参数为:血药浓度-时间曲线下面积(AUC)为21.25mg/(h.dm3),平均滞留时间(MRT)为2.41h,清除率(C lB)为0.94dm3/(kg.h),稳态表观分布容积[Vd(ss)]为2.27dm3/kg,消除半衰期(t1/2β)为3.61h.结果显示氟苯尼考在九孔鲍体内吸收良好,分布广泛,代谢消除快.     

两种水质处理方式对养虾池内弧菌数量变化的影响

在两个对虾养殖场，采用不同的水质处理方式养殖凡纳滨对虾（Lhopenaeus vannamei，俗称南美白对虾），并对池内及其附近海域的弧菌数量、水化因子进行跟踪监测．结果表明使用有益微生物制剂处理水质的两口养殖池弧菌数量明显减少，弧菌细胞密度均值分别为535、918个／cm^3，对虾生长正常，水质稳定．另一使用消毒剂处理水质的养殖场弧菌数量较高，两口监测池的弧菌细胞密度均值分别达到373l、4182个／cm^3，且水色变化较大，对虾出现体色异常现象．     

GEOCHEMICAL CHARACTERISTICS OF ARSENIC IN SEDIMENTS FROM BOHAI GULF

This paper deals with the geochemical characteristics of arsenic in sediments from Bohai Gulf. The arsenic in seawater, surface sediments and cores is determined. Also measured are other physical and chemical parameters, such as Ni, Fe, C, pH and Eh in sediments. The values of As range from 0.6 to 4.5 ppb in seawater, from 10.0 to 20.9 ppm in surface sediments and from 6.8 to 22.8 ppm in cores.The contents of As from south are higher than those from north. However the As in sediments is the element not affected by pollution.The adsorption and codeposition of Ferric oxide colloid are the major form of transference of As from seawater to sediments in Bohai Gulf.The valence state of As in sediments is HAsO42-     

Analytical Solutions to the Flow Field Induced by Uniformly Moving Multiple Helical Vortex Filaments

This paper presents analytic solutions for the flow field of inviscid fluid induced by uniformly and rigidly moving multiple helical vortex filaments in a cylindrical pipe. The relative coordinate system is set on the moving vortex filaments. The analytical solutions of the flow field are obtained on the assumption that the relative velocity field induced is time-independent and helically symmetrical. If the radius of the cylindrical pipe approaches infinity, these solutions are also available for tmbounded space. The results show that both the absolute velocity field and pressure field are periodical in time, and may reduce to time-independent when the helical vortex filaments are immobile or slip along the filaments themselves. Furthermore, the solution of velocity field is reduced to Okulov‘s formula for the case of a single static vortex filament in a cylindrical pipe. The calculated locations of pressure peak and valley on the pipe wall agree with experimental results.     

壳聚糖诱导植物抗病机制研究进展

对壳聚糖在植物抗病诱导中的作用机制进行了综述。壳聚糖可直接抑制病原菌生长 ,诱导植物产生病程相关蛋白 ,积累次生代谢产物 ,并参与植物 -病原菌之间的信号传导。评述了壳聚糖信号传递的可能途径及其与激素信号传导的关系 ;提出了开发壳聚糖生防农药的可行性及进一步研究的重点。     

Hydroelastic Response Analysis of Mat-Like VLFS over A Plane Slope in Head Seas

1 .IntroductionIntheexploitationofoceanresourcesandintheutilizationofoceanspaces,verylargefloatingstructures (VLFS)suchasMega FloatinJapan (Isobe ,1 999)andMobileOffshoreBase (MOB)inUSA (Remmers ,1 999)playasignificantrole .However,owingtotheirlargesizesandrelativelylowbendingrigidities ,theirhydroelasticresponsesinwavesareofthemostconcern .ManystudieshavebeencarriedoutforthepredictionofthehydroelasticresponsesofVLFS′s (Kashiwagi,2 0 0 0 ;Cui,2 0 0 2 ) .However,inalmostallofthesestu…     

绿色创新还是污染转移:环境规制效应文献综述与协同减排理论展望

环境规制下经济发展与节能减排双赢问题一直是政府和学界关注的焦点问题。本文从环境规制效应出发梳理绿色创新和污染转移文献,并从中揭示二者之间割裂的原因,提出产业链跨区域协同创新是跨越创新门槛的主要路径。最后,利用演化经济地理理论,提出几点跨区域协同减排研究重点与理论展望,以期为环境规制下跨区域协同减排研究提供理论支持与可行方向。     

SSTA年代际变化对ENSO事件的调制作用以及它与LOD、SOI等的关系研究

用带通滤波方法从日长变化(LOD)、南方涛动指数(SOI)和Nino各海区海面温度异常变化(SSTA)等资料中提取年际和年代际变化分量,研究了Nino3．4海区SSTA的年代际分量对ENSO事件的调制作用．研究发现,除了年际分量之外, SSTA的年代际分量对ENSO事件的表征和监测有重要影响．当ENSO事件比较强时,SSTA年代际变化分量的作用倾向于使ENSO事件的时间延长,并使事件的极端温度增大;当ENSO事件比较弱时,在SSTA年际变化中没有检测到的事件,可借助于年代际变化分量的调制作用得到检测．还研究了SSTA年际和年代际变化与SOI、热带太平洋海平面气压异常(SLPA)和信风异常(TWA),以及大气角动量(AAM)和海洋角动量(OAM)轴向分量(χ3)的相应变化之间的频谱相干性．结果表明在年际尺度上,SSTA与LOD、SOI、SLPA、TWA、大气角动量的轴向分量(χω3,χpib3和χωpib3)和海洋角动量的轴向分量(χv3和χv bp3)等都有密切关系,其中以SOI、SLPA、TWA和χω3与SSTA的关系更加显著;在年代际时间尺度上,SSTA与SOI、SLPA、TWA、χω3以及χω v3的关系更为密切,与LOD、大气压(χpib3)和洋底压强(χbp3)的关系较弱．     

BRANCHING-TYPE MODELS OF FLOW THROUGH POROUS MEDIA

Abstract

Some time ago the authors investigated a random-graph model for explaining the mechanics of flow through porous media. In the present paper this earlier approach is further extended; first, to the discussion of a three-dimensional random-graph model and second, to an investigation of lateral dispersion in porous media. Comparisons with experimental results are given.