简介：即C区所用和隐含部分00B2F21BH+0000003FH=00B2F25AH读取逻辑D盘分区信息表,扩展分区所占用的总的扇区数,结束点为FE FF FF.逻辑E盘之前已用的扩展分区扇数00B2F21BH+0000003FH=00B2F25AH即D盘所用和D盘前隐含的部份 5A F2 B2 00逻辑E盘所占扇区数（包含自身及隐含的0头上的63扇） 

简介：5AF2B200为扩展分区前所用扇区数,结束点为FEFFFF.逻辑E盘之前已用的扩展分区扇数00B2F21BH+0000003FH=00B2F25AH即D盘所用和D盘前隐含的部份5AF2B200逻辑E盘所占扇区数（包含自身及隐含的0头上的63扇） ,即C区所用和隐含部分00B2F21BH+0000003FH=00B2F25AH读取逻辑D盘分区信息表

简介：H13(美国钢号)是使用最广泛的热作模具钢之一。由于这种钢裂纹敏感性较强,所以在炼钢、热加工中如果控制不当,很易引起开裂,最常见钢坏角裂现象。结合生产实例试图从钢质及热加工制度两方面探讨开裂原因。

简介：WhatisPADIS-INT?PDIS-INTisthesoftwareuniversallyappliedinpopulationprojection,whichisdevelopedbyCPDRCwiththeguidanceandsupportofDirectorofPopulationDivision/DESA,UnitedNations,basedontheadvancedtechnologiesusedintheoriginalversionofPADIS.Applyingtheadvancedcom-putertechnologiesinpopulationprojection,thesoftwarehasfollowingthreefeatures:1.theJAVAvirtualmachineassurestheirrelevancebetween

简介：ThisstudyresearchestheeffectsoftherefiningtreatmentonthemicrostructureandthemechanicalpropertiesofH13mandrelsteelandcomparestheseeffectswiththoseoftheconventionaltreatment.Theresultsindicatethatbothcarbideparticlesandgrainswererefined,carbideparticleswereuniformlydistributedbytherefiningtreatment,andtherefore,thestrengthandtoughnessofH13mandrelsteelwereimproved.Rapidcoolingafterthesolutiontreatmentmayinhibitintra-granularprecipitationofcarbideparticles,whichisfavorabletoenhancingtoughness.Consequently,high-performanceH13mandrelsteelcanbeproducedbyproperrefiningtreatment.

简介：Opticalmicroscope,stereomicroscope,scanningelectronicmicroscope(SEM)andmechanicalpropertytestingwereusedtoresearchtheeffectsofdifferentquenchingtemperaturesonthemicrostructureandmechanicalpropertiesoftheH13mandrelsteel.Theresultsindicatethatfollowinganincreaseinthequenching,thedegreeofalloyingisenhancedduetothecarbidesdissolvinggraduallyinaustenite,whichimprovesthehardenabilityofthespecimens,aswellastheirroomandhigh-temperaturestrength.Atthesametime,thefracturetoughnessincreasesduetotheincrementofthemartensitenumberandtheinterparticledistanceofthecarbides.However,extremelycoarsegrainandmartensitecandecreasetheimpacttoughness.Optimalperformancecanbeobtainedafterquenchingat1060℃anddoubletemperingat620℃.Consequently,theservicelifeoftheH13mandrelsteelisextendedsignificantly.

简介：￣１ＨＡＮＤ￣（１３）ＣＮＭＲＳＴＵＤＹＯＦＩＮＣＬＵＳＩＯＮＣＯＭＰＬＥＸＡＴＩＯＮＯＦＤＳＳＷＩＴＨβ－ＣＹＣＬＯＤＥＸＴＲＩＮ￥ＱｉｎｇＸｉａｎｇＧＵＯ；ＴａｎＲＥＮ；ＺｉＺｈｏｎｇＬＩａｎｄＹｏｕＣｈｅｎｇＬＩＵ（ＮａｔｉｏｎａｌＬａｂｏｒａ...

简介：本文报道了明胶的标准1H和13C——核磁共振谱,并附有精确的化学位移值,对未知谱线进行了归属.

简介：某大断面H13铝型材挤压模具经过短期服役后，模具分流桥根部发生断裂，对材料的力学性能、组织、化学成分进行了测试分析，并观察了失效断口形貌。结果表明：模具失效原因是由于热处理制度不符合要求，H13钢的硬度偏低、屈强比小、模具的使用温度高、分流桥位置应力集中等因素造成的；建议控制模具使用环境，其最佳使用温度为500～550℃。

简介：Lowtemperaturecompositechromizingisaprocesscomposedofaplainion-carbonitridingorion-nitridingat550～580℃,followedbyalow-temperaturechromizinginasalt-bathof590℃.ThemicrostructureandpropertiesofthelowtemperaturecompositechromizedlayeronH13toolsteelwereinvestigatedusingmetallography,X-raydiffraction,microanalysis,hardnessandweartests.Itwasfoundthatthislowtemperatureprocesswasthermodynamicallyandkineticallypossible,andthecompositechromizedlayeronH13steel,withathicknessof3～6μm,consistedofthreesub-layers(bands),viz.theouterCr-richone,theintermediate(black)one,andtheinner,originalwhitelayer.Afterchromizing,theformerdiffusionlayerwasthickened.TheresultsofX-raydiffractionshowedthatthecompositechromizedlayercontainedsuchnitridesandcarbidesofchromiumasCrN,Cr2N,(Cr,Fe)23C6,and(Cr,Fe)7C3,aswellasplainα-(Fe,Cr).Ahighsurfacemicrohardnessof1450～1550HV0.025,whichismuchhigherthanthatobtainedbytheconventionalioncarbonitridingandionnitriding,wasobtained.Inaddition,anexcellentwearresistancewasgainedonthecompositechromizedlayer.

简介：摘要本文主要简述了化学成分对H13钢性能的影响，分析H13模具钢生产关键技术、H13钢的金相组织与性能，为准确了解钢材质量，随机在商品材上进行取样分析，并同时取了瑞典8407、德国1.2344和国内某厂的H13进行对比分析。

简介：Biomimeticsurfaceisaneffectivewaystopromotetheperformancegradeandappliedrangeofmaterialswithoutalteringtheirsubstrate.Manyimprovedpropertiessuchasresistingfatigue,enduringwear,etc,havebeenachievedbyapplyingbiomimeticmorphologyorstructuretosomeengineeringmaterialsurfaces.Inthispaper,aimingtorevealtherelationshipbetweenthermalcrackingbehaviorandmechanicalpropertiesofengineeringmaterialswithbiomimeticsurface,biomimeticspecimenswerefabricatedusinglasertechniquebyimitatingtheheterogeneousstructureonthesurfaceofplantleaves.TheeffectofthermalfatiguecyclingonthetensilepropertiesofH13diesteelspecimenswithdifferentsurfaces(severaltypesofbiomimeticsurfacesandasmoothsurface)wascomparedandinvestigated.Asaresult,duetothecouplingeffectsofthemorphologicalfeaturesonthesurfaceandthemicrostructurecharacteristicswithinunitzone,thesespecimenswithbiomimeticsurfaceexhibitremarkablyenhancedUltimateTensileStrength(UTS)and0.2%YieldStrength(YS)comparedwithreferencespecimenswhilecorrespondingductilityremainslargelyunaffectedevenheightened,whetherthethermalfatigueloadsornot.Therelativemechanismsleadingtotheseimprovementshavebeendiscussed.

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简介：摘要：4Cr13H在线预硬扁钢，在经过一次回火处理后，精整带锯切割困难，通过对锯切横截面观察，发现锯切横截面凹凸不平，并且伴有麻点。切取试料，做低倍，成分，硬度，金相等检验，进行全面分析，造成锯切困难的原因是：局部成分偏析，回火时组织转变不完全。

简介：Theworldisundergoingconstantandcomplicatedchange.Development,adjustmentandtransformationmakeuptheworld’smainmelody,whilepeaceanddevelopmentarestillthecurrentthemes.Multi-polarizationandeconomicglobalizationcontinuetobecomemoreentrenched,andculturaldiversityandsocialnetworkingacross

简介：通过对不同淬火及回火工艺处理的H13钢进行硬度测试及金相分析,结果显示：H13钢在1020℃～1080℃淬火温度范围内、530℃～650℃回火温度区间内,随淬火温度的升高,钢的淬火硬度有先升高后下降的趋势,H13钢在1050℃左右淬火时其淬火硬度最高.当淬火温度相同时,随回火温度的升高,钢的回火硬度呈现出先升高后下降的趋势,在560℃左右回火时其回火硬度达到峰值,此时钢的组织主要由板条状回火马氏体、细小碳化物颗粒加少量的残余奥氏体组成,且随着回火温度的升高,回火马氏体逐步向回火索氏体转化;当回火温度达到620℃～650℃时,钢的硬度开始急剧下降.

简介：InvitedbyDr.HaniaZlotnik,Director,PopulationDivision/DESA,UnitedNations,adelegationofNationalPopulationandFamilyPlanningCommission(NPFPC),headedbyViceMinisterWangPei’an,andcomposedofDeputyDirector-GeneralZhangYangofInternationalCooperationDepartment,Director-GeneralJiangWeipingofChinaPopulationandDevelopmentResearchCentre(CPDRC)andothermembers,attendedthe44thSessionoftheUNCommissiononPopulationandDevelopmentfromApril11thto

简介：Analysisoftheissuecallsforsomequestionsofmethodology.First,thelawofhistoricaldevelopmentteachesthatallcountries,nomatterhowstrongtheymaybe,willeventuallydecline.SothepointisnotwhethertheUnitedStateswillbeanexception,butwhenandhowwillthedayofreckoningdescendontheworld'scurrentsolesuperpower.

简介：Whenwestudytheinternationalenvironmentthatfacesanationoraregioninaspecificperiod,wehavetoobserveitsstrategicobjectivesfirst.China’sstrategicobjectivesinthefirsttwodecadesofthe21stcenturyare:Tobuildawell-offsocietyinanall-roundway,toachievecompletereunificationofthemotherland,andtosafeguard