简介:随着网络的不断变化与发展,企业投资建网之初便必须面对网络的未来扩展,然而选用传统的大型机箱式交换设备就意味着昂贵的价格.且初期受限于应用规模很容易造成设备闲置浪费,
简介:<正>SriLankawasnamed"Simhalauipa"inancienttimesanditwasasouth-Asianislandwitharecordedhistoryofmorethan2,000years.OnFebruary4,1948,thecountryformallyannouncedindependenceandadopted"Ceylon"asthestatename.InAugust1978,thecountrychangeditsnameto"TheDemocraticSocialistRepublicofSriLanka"or"SriLanka"forshort.
简介:研究了实现DGS(defectedgroundstructure)低通滤波器的方法。DGS滤波器具有很好的慢波、带阻特性,可以有效地改善滤波器特性。利用电路分析法讨论了DGS微带线的等效LC电路及其参数提取。研究了加窗技术在微带缺陷地结构中的应用,仿真表明加窗技术可以有效地改善带内平坦度。制作了相应的实际电路,仿真结果和实验测试结果基本吻合。
简介:Akindofdual-band-stopfilterwithanunsymmetricalT-shapedefectedgroundstructure(DGS)isproposed.Thefilterhastwobandgapcentersat4.9GHzand7.35GHz,respectively,wherethetwocentrefrequenciesarejustthesecondandthirdharmonics2.45GHz.Thefilterswithhighband-stopperformanceandwidebandspurioussuppressioncanbeachievedbycascadingminiaturizedunsymmetricalT-shapeDGS.Theattenuationofthree-cascadedT-shapeDGSfilteris30.77dBat4.9GHzand17.96dBat7.35GHzrespectively.Theaboveexperimentalresultsareingoodagreementwiththesimulationresults,especiallyforthethirdharmonic.
简介:现在的学习被承担决定病原并且M的isolates的基因差异。从斯里兰卡的湿、中间、干燥的地区收集考虑到的oryzae开发授与持久的抵抗到米饭的米饭变化强风。不重要词法或生长变化在学习的isolates之中存在。基因差异孤立由执行Pot2transposable决定元素基于repetitive
简介:Phosphorus(P)deficiencyinsoilisamajorconstrainforriceproduction.Animportantsetofricegenotypes(landraces,oldimprovedandnewimprovedvarieties)werescreenedforPdeficiencytoleranceintwomajorcroppingseasonsofSriLanka,in2012.TheUltisolsoil,whichwascollectedfromaplotcultivatedwithricewithoutfertilizerapplicationforpast40years(P0)attheRiceResearchandDevelopmentInstitute(RRDI),Bathalagoda,SriLanka,wasusedasthepottingmediumforgreenhousetrials.TwofieldtrialswereconductedinthesameplotsatRRDI.BothP0andP30(30mg/kgP2O5)conditionswereusedinthetwogreenhousetrials.Attheearlyvegetative(threeweeksaftertransplanting),latevegetative(sixweeksaftertransplanting)andfloweringstages,plantheightandnumberoftillersperplantwererecorded.Atthefloweringstage,shootswereharvestedandshootdryweight,shootPconcentration,shootPuptakeandPutilizationefficiencyweremeasured.Alldatawerestatisticallyanalyzedusinganalysisofvariance,regressionandclusterprocedures.ThemeasuredparametersweresignificantlydifferentbetweenP0andP30conditions(P<0.05).HighershootdryweightwasreportedbythericegenotypesH4andMarssunderP0conditions.TheregressionanalysisbetweenshootdryweightandPutilizationefficiencyrevealedthatthestudiedricegenotypescouldbecategorizedtothreePdeficiencytoleranceclasses.Atotalof13genotypescouldbeconsideredashighlytolerantand4genotypesassensitiveforPdeficiency.Theseresultscouldbeusedtoselectparentalgenotypesforbreedingandgeneticstudiesandalsotoselectinterestingvarietiesorlandracesfororganicriceproduction.
简介:<正>AttheinvitationoftheSriLanka-ChinaFriendshipAssociation(SLCFA),a5-memberCAFIUdelegationheadedbySecretary-GeneralNiJianvisitedSriLankafromMarch31toApril2.IntheeveningofMarch31,thedelegationarrivedatColomboAirport.SLCFAPresidentAnandaGoonatillekeandhiswife,