共查询到20条相似文献，搜索用时 578 毫秒
1.
Wang Jinxing Liu Changbin Zhang Hongwei Zhao Shuangyi Zhang Yanjun Zhao Jing 《海洋学报(英文版)》1998,17(4):531-536
ThisworkisfundedbyagrantfromtheNationalKeyTaskProjectsof8thand9thFive-yearplanprogram.INTRODUCTIONInthepastyears,studiesonthevirusesofpenaeidshrimpshavemadegreatprogressinvari-ouscountries.Rightnow,aboutl4virusesofpenaeidshrimpswerefound,i.e.BP(Baculoviruspenaei,Couch,1974),MBV(Penaeusmonndonbaculovirus,Lightneretal.,1983)orPBV(Penaeusplebejusbaculovirus,Lesteretal.,1987),BMN(Baculovirusmidgutglandnecrosisvirus,Sanaetal.,1981),PHRV(Penaeushybridrod-shapedvirus,Owensetal.,199l),… 相似文献
2.
FU Jinghu ZHANG Wenbing MAI Kangsen FENG Xiuni XU Wei LIUFU Zhiguo TAN Beiping 《海洋学报(英文版)》2006,25(5):141-150
1 IntroductionHighly reactive oxygen species (ROS) such assuperoxide anion radical (O2-), hydroxyl radical(HO·), singlet oxygen (1O2) and hydrogen perox-ide (H2O2) are continuously produced in the courseof normal aerobic cellular metabolism. It is widely… 相似文献
3.
Starting from vorticity equation, the triggering mechanism and amplitude decay of shear waves in the ocean are discussed in this paper. The theoretical analysis indicates that by the action of stripped external force (for examples, the sudden setting of stripped wind, moving stripped wind, etc. ), shear waves can be triggered. This is qualitatively consistent with satellite observations. The amplitude decay process of shear waves by the action of side friction is also discussed in the paper. The theoretical model is quantitatively consistent with satellite observations. 相似文献
4.
The solid state phase transformation of Cu--Al--Bi alloy under high pressure was investigated by x-ray diffraction, energy dispersive spectroscopy and transmission electron microscopy. Experimental results show that the initial crystalline phase in the Cu--Al--Bi alloy annealed at 750 °C under the pressures in the range of 0--6 GPa is α-Cu solid solution (named as α-Cu phase below), and high pressure has a great influence on the crystallisation process of the Cu--Al--Bi alloy. The grain size of the α-Cu phase decreases with increasing pressure as the pressure is below about 3 GPa, and then increases (P>3 GPa). The mechanism for the effects of high pressure on the crystallisation process of the alloy has been discussed. 相似文献
5.
Recently many authors have attepmted to model circulations in East China Sea by numerical means, for example, Xi et al1),2). (henceforth Ref.[1] is referred to as A and[2] as B respectively), Yuan et al. and Chio. We had raised questions in regard to the correctness of the governing equations used in A, as well as their choice of boundary conditions. Comparing numerical solution of A with that of B which employed a correct form of governing equations (but with an incorrect value for the bottom friction coefficient), B asserted that the governing equations used in A were correct. It is, therefore, appropriate to have a discussion on the formulation of proper equations. 相似文献
6.
1IntroductionAlotofworkonthestudyofthecircula-tionintheHuanghai(Yellow)Sea(HS)andEastChinaSea(ECS)hasbeenmadeandreviewedbyscientists,suchasSu(1998),Suetal.(1994),Guan(1985),YuanandSu(1983,2000),Yuanetal.(1997,1988,1994,2001),Tangetal.(2000)andsoon.Inthispapertheseworks willnotbereviewedagainduetolimitationofpages.Thejointinvestigationontheair-seainteractionprocessofcycloneoutbreakoverthesouthernHuanghaiSeaandEastChinaSeawascarriedoutinthecooperativestudybytheChinese(in-clusiveofTaiwa… 相似文献
7.
Liu Shengfa 《台湾海峡》1996,(4)
1.Lecithochiriumfukenensissp.nov.(Fig.1)(Basedon6wholemounts)ThisspiceswascollectedinthestomachofTrichiurushaumelafromXiamenandNan'ao.Bodydividedintosomaandecsoma.Soma1,31~3.48×0.426~1.05(2.69×0.737),ecsoma0.22~0.80(0.448)longwhenprotruded,usuallycomple… 相似文献
8.
Tradescantia paludosa, a species from U.S. (1979), is known with its high sensitivityfor mutagen when used in Tradescantia micronucleus (MCN) bioassay. The sensitivity ofT. reflexa, a special clone of Tradescantia found in Qingdao, China (1980), to mutagens 相似文献
9.
Wen Shengchang 《海洋学报(英文版)》1988,7(1):1-16
In this part ot the paper theoretical wind-wave spectra nave been derived oy (I) expressing the spectrum in series composed of exponential terms; (2) assuming that the spectrum satisfies a high order linear ordinary differential equation; (3) introducing proper parameters in the spectrum; and (4) making use of some known charateristics of wind-wave spectrum, for instance, the law governing the equilibrium range. The spectrum obtained contains the zero order moment of the spectrum m0, the peak frequency ω0 and the ratio R =ω/ω0 (ω being the mean zero-crossing frequency) as parameters. The shape of the nondimensional spectrum S(ω) = ω0S(ω)/m0(ω=ω/ω0) changes with R and theoretically reduces to a Dirac delta function δ(ω-1) when R = 1. A spectrum of simplified form is given for practical uses, in which R is replaced by a peakness factor P=S(1). 相似文献
10.
Experimental and Numerical Study of Wave-Induced Long-Shore Currents on A Mild Slope Beach 总被引：4，自引：0，他引：4
1.Introduction Long shorecurrenthasbecomethesubjectofextensiveworldwideresearchformanyyears.The purposeofthestudyistounderstandandpredicttheprocessesofsedimenttransport,shorelineevolu tionandpollutanttransportinthenear shorezoneundertheactionofwaves.Goda(2001)regarded thesuspendedsedimentastheprincipalloadinsedimenttransportandtheeffectoflong shorecurrents wasemphasized.Theeffectofwavesonpollutanttransportwasstudiedbynumericalmodelandfield experiment(TaoandHan,2002;Rodriguezetal.,1995),andth… 相似文献
11.
ZHU Xiaohua 《中国海洋工程》2000,14(4):533-540
According to the fractal theory,the spatial fractal character of coastline is preliminarily dis-cussed on the basis of GIS in this paper.Two aspects are considered:one is the length demarcation ofcoastline with different scales,and the other is the confirmation of existence of the fractal character on dif-ferent boundaries of tidal flats.Finally,some significant conclusions are drawn:(1)The coastline ofJiangsu Province has the fractal character and its dimension is 1.0696.(2)It conforms to the exponentialcorrelation between different lengths(L)of coastline and scales(k).It conforms to the formula lgL(k)=-1.029lgk+2.9544 in the continental coastline of Jiangsu province.(3)Different boundaries of a tidal flathave fractal characters,and different fractal dimensions indicate different comparative intensities of ero-sion and deposition on the tidal flat.(4)The reciprocity between land and sea may affect the value offractal dimension of a coastline,just as the lithology,substantial constituent and geological s 相似文献
12.
Li Dashan Shen Ying Ren Rushu Chen Yao
Senior Engineer River Harbour Department Nanjing Hydraulic Research Institute Nanjing Engineer River Harbour Department Nanjing Hydraulic Research Institute Nanjing Associate Professor Hohai University Nanjing Master Hohai University Nanjing 《中国海洋工程》1997,(1)
In this paper,the characteristics of density current under the action of waves are describedwith the help of flume experiment and theoretical analysis.The study shows that turbid water under the ac-tion of the waves can present three types of motion,i.e.significant stratification,fragile stratification andstrong mixing.The motion of turbid water presents significant stratification when(H/D)/△ρ/ρ~(1/2)≤4.5,generally this state is known as density current.The formulas of motionvelocity,thickness,and discharge of density current moving on horizontal bottom are derived by use of ba-sic equations such as momemtum equation,equation of energy conservation and continuity equation offluid.The time-average velocity and the thickness of density current under the action of waves have a rela-tionship with such parameters as relative density(△ρ/ρ),wave height(H),and water depth(D).Whenthese parameters are determined,the time-average thickness and motion velocity of density current are al-so determined.The relat 相似文献
13.
Vertical variations of wave-induced radiation stress tensor 总被引：3，自引：0，他引：3
INTRODUcrIONThe concept of radiation stress was deve1oPed by tonguet--Higgins and Stewart (1964 ),who intreduced the definition of radiation stress as the excess mornentum due to the presence ofwaves, on the basis of time-averaged laws of Newtonian fluid mechanics and the assmption ofa unifOrm velocity distribution over depth. Subequently, the theory has been applied success-fully in the investigation of phenomena such as wave set-up and set--down (Bowen et al.,l968), longshore currents … 相似文献
14.
The soluble organic matters were extracted from marine sediments in the sea area of Southern Ocean by using organic solvents. The hydrocarbon and carboxylic acid fractions were separated with the thin layer chromatography. The organic compounds of 170(H), 21α(H)- bishomomoretene, cholest - 5 - ene, 24 - methyl - cholestene, 24 - ethylcholestene, hop-17(21)-ene, neohop - 13(18)-ene, fern-8-ene, fern-7-ene, 170(H), 210 (H) - hop - 22(29)-ene (diplotene), steranes, β, β-hopanes C29 -C31 and unsaturated carboxylic acids C18:2Δ9.12 , C18:1Δ9,C18:1Δ11 , have been identi-fied in the hydrocarbon and carboxylic acid fractions by means of gas chromatography and gas chromatography - mass spec-trometry - data system. The distributions of 3, a - bishomomoretene, β,β- hopene and β,β- hopane are characteristic of immature organic matter. The sterane, C29 20S/20R epimer ratio 0. 6 indicate that the organic matter had experienced a thermal evolution in the early sedimentation. The unsaturated fatty acids espec 相似文献
15.
INTRODUCTIONDirectionalspectraofwind-generatedwavesareveryimportanttotheresearchrelatedto1.InstituteofPhysicalOceanography,OceanUniversityofQingdao,Qingdao266003,China2.ResearchinstituteforAppliedMechanics,KyUshuUniversity,Kasuga816,Japanwindwaves.Theyfindapplicationinfieldsasdiverseasbasicair-seainteraction,practicalwaveforecasting,satellitesurveillanceandengineeringdesignofmarinestructuresandvehicles.Sincethepioneeringworkofthestereowaveobservationproject(Coteetal.11960),alotofeff… 相似文献
16.
1 IntroductionThe microsatellite DNA markers, which werealso called simple sequence repeats (SSR), are oneof the DNA markers developed in the late 1980s.The microsatellite DNA markers have several advan-tages over other molecular markers. For example,(1) … 相似文献
17.
18.
1Introduction Heterotrophicmicrobesarenowconsideredtobe significantcomponentsofthestructureandfunctionof marinepelagicecosystems.Heterotrophicbacteriacon- stituteamajorpoolofbiomassinopenecosystem (WilhelmandSuttle,1999).Theyconsumealargepor- tionofprimaryproduction(Li,1998;Sherryetal., 2002;Lietal.,2004),andtheymineralizemostofthe dissolvedorganiccarbonthattheyconsume(Azamet al.,1983;Richetal.,1997;Azam,1998).Therolesof planktonicprotists,suchasheterotrophicflagellates andciliates,inmicro… 相似文献
19.
Karyotypes of three species of the marine Veneroida molluscs 总被引：1，自引：0，他引：1
INTRODUCTIONExceptforcorbiculalivinginfreshwater,themostVeneroidamolluscsliveinthesea .Theyarewidelydistributedwithlargequantityofcategories.Manyofthebivalvemolluscsareculturedfortheireconomicvalue .ThespeciesofSolengrandis,SaxidomuspurpuratusandMactrachinensisareaquaculturedinthenorthernseasofChina .Morphologyandcultivationbiologyofthebivalvemolluschavebeenreported (Qietal.,1 989;Weietal.,1 995;Wangetal .,1 984 ) .Asthefoundationofbivalvemollusccytogenetics ,chromosomestudyiscritical… 相似文献
20.
In this study,about 220 satellite images between 2000 and 2012 were obtained from FY-series,MODIS,CBERS,HJ-1A and HJ-1B to estimate the impact of duststorms on the South Yellow Sea(SYS),which serve as an important source of particles there.The analyzing results from the images support a total occurrence of 88 duststorms(including the locally-generated dusty weather) that affected the SYS during 2000–2012.The annual occurrence was about 4–10 times(10 times in 2000 and 2004;four times in 2009 and 2012),predominantly in March(29%),April(33%) and May(22%).By mapping the distribution of their frequency,the duststorms influencing the SYS were found primarily moving from the northwest(39 times,44.3%) and west(37 times,42%) to the study region with only 11 duststorms(12.5%) coming from the north and 1 duststorm(1%) from the southwest.We estimated that an annual amount of 0.5–3.5 million tons of sediment particles was brought to the SYS by the duststorms during 2000–2012. 相似文献