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简介：Ultramafichypoxenolithsfoundinthealkali-richporphyryintheLiuheVillage,Heqing,Yunnan,China,areofgreatsignificanceinunderstandingtheoriginandevolutionoftheporphyry.Thispaperdiscussesthemineralogicalfeaturesofthehypoxenoliths.Itshowsthatthexenolithsarecharacterizedbytheuppermantlerocksmodifiedtocertainextentbytheenrichedmantlefluidmetasomatisminthemantleenvironment,withtheenrichedmantlepropertyofIow-degreepartialmelting.Thisconstitutestheimportantmineralogicalevidenceforthepetrogenesisandmineralizationofalkali-richporphyry.

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简介：本文展示了北京大学医学部医学英语专业英语精读课程RICH教改行动研究的第一阶段。通过对RICH模式的理论基础和基本内容进行回顾和探讨,本文提出了构建RICH（X）教学模型,以实现RICH模式与课程X的优化结合。结合医英专业精读教学改革第一阶段案例,阐释了适合该专业特点的RICH（X）模型——RICH（医英精读）模型的构成和内涵,揭示了RICH（X）教学模型的构建过程,为其他英语课程教学改革提供了可借鉴的构建思路。

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简介：Theelectrostaticsheathwithacylindricalgeometryinanion-electronplasmaisinvestigated.AssumingaBoltzmannresponsetoelectronsandcoldionswithbulkflow,itisshownthattheradiusofthecylindricalgeometrydonotaffectthesheathpotentialsignificantly.Wealsofoundthatthesheathpotentialprofileissteeperinthecylindricalsheathcomparedtotheslabsheath.Thedistinctfeatureofthecylindricalsheathisthattheiondensitydistributionisnotmonotonous.Thesheathregioncanbedividedintothreeregions,twoascendantregionsandonedescendantregion.

简介：AprototypeofPulsedPlasmaArcCladdingsystemwasdeveloped,inwhichsinglepowersourcesuppliesbothtransferredplasmaarc(TPA)andnon-transferredplasmaarc(N-TPA).BothplasmasworkinturninahighfrequencycontrolledbyanIGBTconnectingnozzleandworkpiece.TheworkingfrequencyofIGBTrangesfrom50～7000Hz,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).

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简介：RICH教学在浙江师范大学外国语学院的最初实践始于1980年代末，到1990年代中期形成系统，并得到一定程度的推广。但其在实践中仍主要从教书与育人两个方面提出了当前教师在教学中所应该贯彻的一贯思路，其最主要任务是引导学生成长，努力将学生培养成心智健康发展的对社会有用的人才。但由于该任务过于宏伟，使得在执行过程中由单个或者单科老师来实施，显得过于困难。若要真正推行RICH教学理念，需要所有各门课程教师的真诚合作、对所有教材的重新整理，并需要学院甚至学校层面自上而下的行政支持。

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...

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简介：高密度的RF离子来源是一个中立横梁注射者的必要部分。在这研究，作者试图由通过分泌物房间的对称的轴插入一个薄绝缘的试管翻新一个原来的常规RF离子来源反应堆。在这个内胎的帮助下，反应堆能够产生一个光线的磁场而不是原来的横向的磁场，它解决E????