简介：Averticalantennaembeddedinearthwithconductivecoatinghasbeeninvesti-gatedbyemployingthemethodofintegralequation.ThistopicisavailabletoEM-MWD(Elec-tromagneticMeasurement-While-Drilling)system,whichisanewrealtimesystemfordrillingmeasurement.Undertheconditionthatthewavenumberoftheearthismuchlargerthanthatoftheair,acurrentintegralequationhasbeenderived.Afterthecurrentdistributionhavingbeendetermined,theelectricfieldstrengthontheearthsurfacehasbeenpredictedanditsdependencesontheoperatingfrequencyandthedepthofthewellhavebeendiscussedaswell.

简介：将Google地图无缝集成到石油勘探生产办公系统中,实现了项目信息和地图信息的交互查询。通过此系统,各级领导、各级部门可以实时查阅项目的分布情况、施工区地形地貌信息、设备人员配备信息、物资消耗信息等,并可以自动生成项目周（月）报,设备动态台账,实现石油勘探项目的数字化、网络化、图形化、科学化管理。

简介：Inmodernterrain-followingguidanceitisanimportantindexforflightvehicletocruiseaboutsafelyandnormally.Onthebasisofaconstructingmethodofdigitalsurfacemodel(DSM),thedefinition,classificationandscaleanalysisofanisolatedobstaclethreateningflightsafetyofterrain-followingguidancearemade.Whentheintervalofverticalandcross-sectionsonDSMis12.5m,theproportionofisolatedobstaclestothedataamountofDSMmodeltobeloadedisoptimal.Themainfactorsinfluencingthelowestflyingheightinterrain-followingguidanceareanalyzed,andaprimarysafecriterionofthelowestflyingheightoverDSMmodelisproposed.Accordingtotheirtesterrors,thelowestflyingheightover1:10000DSMmodelcanreach40.5m-45.0minterrain-followingguidance.Itisshownfromthesimulationresultsofatypicalurbandistrictthattheproposedmodelsandmethodsarereasonableandfeasible.

简介：CalculationsoftheElectroMagnetic(EM)responseproducedbyalargehorizontalloopplacedoverlayeredmediumarerathercomplexbecauseitsintegralexpressioncontainstheproductoftwoBesselfunctionsandhasadivergentterm.Inthispaper,animprovedfastHankelandGaver-Stehfesttransformsareintroducedtosolvethestrong-oscillationandslow-decaypropertiesoftheintegrand,whereoneBesselfunctionintheproductissubstitutedbyacarefullychosenpolynomialofhighaccuracyandtheotherusedasthedigitalfiltercoefficientsintheconvolutionintegral.Comparisonsprovethevalidityandtheefficiencyoftheproposedmethod.

简介：ThearchitectureandprotocolsofInternetcan'tworkwellinspaceenvironments.Toformareliableandsafespacenetwork,characteristicsofspacecommunicationnetworkonediscusse,briefsynthesisisperformedforconsultativecommitteeforspacedatasystem(CCSDS)spacecommunicationsprotocolstandards(SCPS),andamodelaccountingfordatasecurityproblemofspace-earthintegratednetworkisprovided.