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简介:Ultramafichypoxenolithsfoundinthealkali-richporphyryintheLiuheVillage,Heqing,Yunnan,China,areofgreatsignificanceinunderstandingtheoriginandevolutionoftheporphyry.Thispaperdiscussesthemineralogicalfeaturesofthehypoxenoliths.Itshowsthatthexenolithsarecharacterizedbytheuppermantlerocksmodifiedtocertainextentbytheenrichedmantlefluidmetasomatisminthemantleenvironment,withtheenrichedmantlepropertyofIow-degreepartialmelting.Thisconstitutestheimportantmineralogicalevidenceforthepetrogenesisandmineralizationofalkali-richporphyry.
简介:StructurePropertiesofLightNeutron-richNuclei¥GuJinnanandZhangChanghuaIntileframeworkoflarge-basisshellmodel[1],thestruct...
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简介:Theelectrostaticsheathwithacylindricalgeometryinanion-electronplasmaisinvestigated.AssumingaBoltzmannresponsetoelectronsandcoldionswithbulkflow,itisshownthattheradiusofthecylindricalgeometrydonotaffectthesheathpotentialsignificantly.Wealsofoundthatthesheathpotentialprofileissteeperinthecylindricalsheathcomparedtotheslabsheath.Thedistinctfeatureofthecylindricalsheathisthattheiondensitydistributionisnotmonotonous.Thesheathregioncanbedividedintothreeregions,twoascendantregionsandonedescendantregion.
简介:AprototypeofPulsedPlasmaArcCladdingsystemwasdeveloped,inwhichsinglepowersourcesuppliesbothtransferredplasmaarc(TPA)andnon-transferredplasmaarc(N-TPA).BothplasmasworkinturninahighfrequencycontrolledbyanIGBTconnectingnozzleandworkpiece.TheworkingfrequencyofIGBTrangesfrom50~7000Hz,inwhichtheplasmascanworkinturnsmoothly.Higherthan500HzofworkingfrequencyissuggestedforpromotionofcladdingqualityandprotectionofIGBT.DragphenomenonofTPAintensifiesasthefrequencygoesup,whichtendstoincreasethecurrentproportionofTPAandsuppressN-TPA.TheoccupationratioofIGBTcanberegulatedfrom5%~95%,whichbalancesthepowersuppliesofbothplasmas.Anoccupationratiohigherthan50%givesadequateproportionofarccurrentforN-TPAtopreheatpowder.
简介:Thegenerationofplasmawhichcanabsorbmicrowavesiscurrentlyaresearchtopicofinterest.Thiskindofplasmaisoftenproducedbythedischargeorelectron-beamimpactofnoblegases.Inthispaperanalternaticeapproach,combustionplasma,isstudied.Theplasmaisproducedbycombustingsolidgrainspreparedspecially.Sixgroupsofpowdersweremadeandusedtogeneratetheplasma.Thetransmissivityofthewaveinplasmawasmeasuredbyemployingamicrowavescalarnetworkanalysersystem.Inaddition,theelectrondensityandthecollisionfrequencyoftheplasmawereexaminedbymicrowavedouble-frequencydiagnosis.Themeasurementresultsshowedthattheplasmacouldabsorbmicrowavesremarkablywithanaveragetransmissionattenuationbeingmorethan18dBinafrequencyrangeof2GHzto15GHz.Thediagnosisindicatedthattheelectrondensityoftheplasmavariedfrom10~(17)m~(-3)to10~(19)m~(-3)andthecollisionfrequencywasabout5×10~(10)s~(-1).
简介:Thispaperanalyzestheexistenceofdevelopmentalviewsandcomparestheresultsofpreviousstudiesforunderdevelopedregions.Inviewofthelimitationsofpreviousstudies,thisstudydetailsregionalunit,expandsindexsystem,appliesfactor-analysistostructureindexsystem,usesthefuzzycomprehensiveevaluationmodeltoimproveanalytichierarchyprocess,andidentifiestheeconomicdevelopmentallevelsof384regions,including4municipalities,333citiesatprefecturelevel,and47countiesunderthejurisdictionofprovince.Thelevelsofthe47countiesareidentifiedbydividingtherankofcomprehensivevaluesofmorethan337regionsunitintofiveequalgraduationsandthenmatchingthe47countieswiththefive-graduationresults.Thisstudyprovidesthedistributionofresources-richregioninChinaqualitativelyandquantitativelyintermsofcoal,oilgasandother14kindsofmetalmineralresources.Finally,bymatchingthetwopartsofresults,thisstudyidentifiesthedistributionofunderdevelopedresource-richregions(URRRs).URRRsaremainlydistributedinShaanxi,Shanxi,Guizhou,Yunnan,Sichuan,He’nan,Shandong,GuangxiandGansuprovinces,whichaccountsfor78.57%ofthetotalinChina.Toacertaindegree,theresultofthispaperprovesthat“resourcescurse”existinginthenationalstratificationplaneinlater20thcenturystilltakesplacesinsomecitiesinChina,especiallyinthecountiesofthesecities’jurisdiction.
简介:TIBETARCHIVES:RichCollectionSpansSome700Years¥//MALIHUALhasaplayedhostthispastAugusttoanInternationalSymposiumonTibet'sArchiv...