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245 个结果
  • 简介:ThetransformationoforganicP(Po)fromorganicmanuresintwotypesofsoils(ultisolandentisol)andtheinfluencesofexternaladditionoforganicsubstanceorinorganicP(Pi)onPoundertheconditionofthe60%maximumwatercapacitywereinvestigated.TheresultsobtainedfromPofractionationexperimentsindicatedthatallthePofractionsexceptforthehighlyresistantPofractiondecreasedduringincubation.ApplicationofpigfecesandcowfecescouldlargelyincreaseeachfractionofPointhesoils.ImmediatelyafterapplicationoforganicmanureintothesoilsalargepartoflabileandmoderatelylabilePofromorganicmanurewastransferredintomoderatelyresistantPo,whichmightbeduetothefactthatCa-orMg-inositolPwasprecipitatedintoFe-inositolP.However,theavailabilityofPofromorganicmanureinthesoilswouldincreaseagainafterincubationbecauseofthetransformationofmoderatelylabileandresistantPofractionsintolabilePofractions.AdditionofcelluloseorPiintothesoilsshowedagoodeffectonincreasingallthePofractionsexceptforthehighlyresistantPo,andthiseffectwasmuchmorepronouncedwhencellulosewasappliedincombinationwithPi.Therefore,inviewoftheeffectoforganicmanureonimprovingPnutritiontoplant,attentionshouldbepaidtoboththePoandtheorganicsubstancesfromorganicmanure,ItissuggestedthatapplicationofPifertilizercombinedwithorganicmanuremaybereferredtoasaneffectivemeansofprotectingPifromchemicalfixationinsoil.

  • 标签: 有机肥 土壤 有机磷 纤维素 磷肥 转化
  • 简介:WesampledthesedimentsoftheEastChinaSeaduring2005and2006,andanalysedthecontentsofthebiogenicmatters:biogenicsilica,organiccarbon,andorganicnitrogen.Fromthesurfacedistributionwefoundthecontentsofthesesubstancestobeintherangesof0.72%-1.64%,0.043%-0.82%,and0.006%-0.11%,respectively.Theirdistributionsweresimilartoeachother,beinghighinsidetheHangzhouBayandlowoutsidethebay.Theverticalvariationsofthecontentswerealsosimilar.Inordertodiscusstherelationbetweenthemweanalysedthevariationsofcontentwithdepth.Theyincreasedinthefirst7cmandthendecreasedwithdepth.Thepeakswerefoundatdepthsbetween20to25cm.Thedistributionofcarbonateshowedanoppositetrendtothatofbiogenicmatters.Thecontentoftotalcarbonwasrelativelystablewithrespecttodepth,andtheratioofhighorganiccarbontocarbonateshowedalowburialefficiencyofcarbonate,whichmeansthatthemainburialofcarbonisorganiccarbon.Inordertodiscussthesourceoforganicmatters,theratiooforganiccarbontoorganicnitrogenwascalculated,whichwas8.01to9.65,indicatingthattheorganicmatterinthesedimentswasderivedmainlyfromphytoplanktonintheseawater.

  • 标签: 东中国海 有机碳 生物硅 沉积物 有机氮 碳酸盐岩
  • 简介:Organicconductorisakindoforganiccompoundwhichhasspecialelectronicandmagneticproperties.Theresearchoftheorganiccompoundshasreceivedconsiderableattentionbecauseoftheirpotentialapplicationsinmanyareas.Themolecularconductiveunitsaretheoreticallyinvestigatedaswellastheirenergygapandchargedistribution.Therelationshipofconductivityandmicro-mechanismisdiscussed.

  • 标签: ORGANIC conductor ENERGY BAND CONDUCTIVITY
  • 简介:torevealthatdiscoursesonimmigrationarealwaysperformativediscourseswhichhelpeffectthewondroussocialalchemywherebya"foreigner"ismadeintoa"national"(Sayad1987and1994).AllthisSayadknewordiscoveredbecausehewasmorethanascholarofimmigration,yetnoneofthepartiestotheAlgerianmigrationwaswillingtofacethatreality.Emigrationisneveran"exportofrawlaborpowerandnothingmore"(Sayad1999a,whichcannotbeexplainedtheonewithouttheother"(Sayad1999a

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  • 简介:which cannot be explained the one without the other" (Sayad 1999a摘要,to reveal that discourses on immigration are always performative discourses which help effect the wondrous social alchemy whereby a "foreigner" is made into a "national" (Sayad 1987 and 1994). All this Sayad knew or discovered because he was more than a scholar of immigration摘要,yet none of the parties to the Algerian migration was willing to face that reality. Emigration is never an "export of raw labor power and nothing more" (Sayad 1999a摘要

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  • 简介:Theorganic/inorganicnanocompositespolymerelectrolytesweredesignedandsynthesized.Theorganic/inorganicnanocom-positesmembranematerialsandtheirlithiumsaltcomplexeshavebeenfoundthermallystablebelow200℃.Theconductivityoftheorganic/inorganicnanocompositespolymerelectrolytespreparedatroomtemperaturewasatmagnituderangeof10-6S/cm.

  • 标签: ORGANIC/INORGANIC NANOCOMPOSITES POLYMER ELECTROLYTE POLYMER LITHIUM
  • 简介:Algerian Immigration in France (Gillette and Sayad 1976),Towards a Sociology of Immigration (Sayad and Fassa 1982),The Crisis of Traditional Agriculture in Algeria (Bourdieu and Sayad 1964)

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  • 简介:which cannot be explained the one without the other" (Sayad 1999a摘要,to reveal that discourses on immigration are always performative discourses which help effect the wondrous social alchemy whereby a "foreigner" is made into a "national" (Sayad 1987 and 1994). All this Sayad knew or discovered because he was more than a scholar of immigration摘要,yet none of the parties to the Algerian migration was willing to face that reality. Emigration is never an "export of raw labor power and nothing more" (Sayad 1999a摘要

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  • 简介:which cannot be explained the one without the other" (Sayad 1999a摘要,to reveal that discourses on immigration are always performative discourses which help effect the wondrous social alchemy whereby a "foreigner" is made into a "national" (Sayad 1987 and 1994). All this Sayad knew or discovered because he was more than a scholar of immigration摘要,yet none of the parties to the Algerian migration was willing to face that reality. Emigration is never an "export of raw labor power and nothing more" (Sayad 1999a摘要

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  • 简介:torevealthatdiscoursesonimmigrationarealwaysperformativediscourseswhichhelpeffectthewondroussocialalchemywherebya"foreigner"ismadeintoa"national"(Sayad1987and1994).AllthisSayadknewordiscoveredbecausehewasmorethanascholarofimmigration,1981b)andhisvivisectionofexileasafallintosocialdarknessin"ElGhorba"(Sayad2000,asa"totalsocialfact"inMarcelMauss's(1990)senseoftheterm

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  • 简介:AlgerianImmigrationinFrance(GilletteandSayad1976),whichcannotbeexplainedtheonewithouttheother"(Sayad1999a,TowardsaSociologyofImmigration(SayadandFassa1982)

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  • 简介:溶解的器官的氮(穿上)因为然而,它可以两个都在滋养穷人的土壤是为植物和主导的可得到的N形式的直接N来源,最近在土壤获得了增加的兴趣它在地中海生态系统的流行仍然保持不清楚。这研究的目的到过i)估计土壤在地中海生态系统的一个宽集合穿上并且比较这为另外的生态系统与那些铺平;ii)描述时间的变化在穿上并且溶解的无机的氮(吵闹)形式(NH+4和NO−;3),并且在植物社区以内描绘空间异质;并且iii)学习土壤的相对比例穿上并且吵闹作为Schimel和班尼特不同N形式的流行跟随的假设的测试形成滋养的可获得性的一个坡度。学习在选择代表大量地中海植被类型的十一个植物社区被执行,从对晚接连著的地位早。在学习地中海植物社区穿上集中(0–;18.2mgNkg−;1)比为另外的生态系统在文学发现的那些一致地低。我们在土壤发现了高时间、空间的可变性为所有植物社区穿上。是为滋养穷人的生态系统由Schimel和班尼特模型预言了,在铵和硝酸盐上穿上优势在冬季和春天土壤样品为大多数植物社区被观察。然而,mineral-N统治了在上在夏天和秋天穿上。因此,土壤水内容可以穿上重要效果穿上对在地中海生态系统的矿物质N优势。

  • 标签: 生态系统模型 可溶性有机氮 地中海 土壤水分含量 土壤样品 植物群落
  • 简介:to reveal that discourses on immigration are always performative discourses which help effect the wondrous social alchemy whereby a "foreigner" is made into a "national" (Sayad 1987 and 1994). All this Sayad knew or discovered because he was more than a scholar of immigration,1981b) and his vivisection of exile as a fall into social darkness in "El Ghorba" (Sayad 2000,Sayad was among this very small group of individuals with whom one feels genuinely at home when introduced to a farmer from Kabylia or B閍rn

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  • 简介:yet none of the parties to the Algerian migration was willing to face that reality. Emigration is never an "export of raw labor power and nothing more" (Sayad 1999a,which cannot be explained the one without the other" (Sayad 1999a,Algerian Immigration in France (Gillette and Sayad 1976)

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  • 简介:Thisworkwasundertakentoresearchorganicwood-flourputtyaswoodensurfaceundercoat.Fourtypesofwood-flour(300,500,800and1000mesh)werepreparedthroughthetechnologicalprocessesofshattering,coarsegrindingandfinegrinding.Andlatex(16%ofsolidcontent)andtwokindsofagents(AandB)wereaddedintotheputty.Inthisexperiment,effectsofagentandparticlesizeofwood-flouronpropertiesoforganicwood-flourputty,suchaspaintingproperties,waterresistance,andabrasive...

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  • 简介:Biomarkerisanimportanttoolinthestudyofmarineorganicgeochemistry.Itsdevelopmentandapplicationmakesitpossibletoelucidatetheprocessandmechanismoftheorganicmatterintheocean.Hydrocarbonsarethemostusefulmolecularmarkers.Theyareusedastracersinmanyaspects,suchassourceindication;thedegradationoforganicmatter;diagensisprocess;environmentalpollutionandpaleooceanicstudy,etc.Theyarestudiedintheestuaries,coastalareaanddeepseatogivetheknowledgeofmarineorganicgeochemistry.Thepaperdealswiththecharacteristics,developmentandapplicationofbiomarkersaswellastheiradvantagesanddisadvantages.

  • 标签: biomarker. hydrocarbon MARINE ORGANIC GEOCHEMISTRY
  • 简介:TheamountsofsoilnonexchangeableKextractedwith0.01mL/Loxalicacidandcitricacidsolutionsandthatwithboiling1mL/LHNO3fortenminuteswereremarkablysignificantlycorrelatedwitheachother,andtheamountextractedwiththeoxalicacidsolutionwashigherthanthatwiththecitricacidsolution.ThesoilnonexchangeableKreleasewascomprisedoftwofirst-orderkineticprocesses.ThefasteronewasascribedtotheinterlayerKinoutersphere,whilethesloweronetothatininnersphere.TherateconstantsofthesoilnonexchageableKweresignificantlycorrelatedwiththeamountsofnonexchangeableKextractedwithboiling1mL/LHNO3fortenminutes.Studyonthefitnessofdifferentkineticequationsindicatedthatthefirst-order,parabolicdiffusionandzero-orderequationscouldalldescribethereleaseofsoilnonexchangeableKwell,butElovichequationwasnotsuitabletodescribeit.

  • 标签: 土壤 有机酸 非交换态钾 钾释放 反应动力学方程式