【英文标准名称】:StandardTestMethodforDeterminationofPotentialInstabilityofMiddleDistillateFuelsCausedbythePresenceofPhenalenesandPhenalenones(RapidMethodbyPortableSpectrophotometer)
【原文标准名称】:测定由于Phenalenes和Phenalenones的存在引起中间蒸馏燃料的潜在不稳定性的标准试验方法-用便携式光谱仪的快速法
【标准号】:ASTMD6748-2002a(2007)
【标准状态】:现行
【国别】:美国
【发布日期】:2002
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D02.14
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:absorbanceunits;burnerfuel;dieselfuel;infrared;infraredspectrophotometer;marinefuel;middledistillatefuel;potentialinstability;spectrometer;spectrophotometer;storagestability;turbinefuel;visiblespectrophotometer;Automotiveenginef
【摘要】:Storagestabilitydependsoncomplexinteractions.Itvarieswithfeedstocktypeandsource,andtheprocessingused.Therateofdegradationmaynotchangeuniformlywithtemperature.Chemicalreactionsmayleadtoachangeincolorfollowedbytheformationofsolublegumsandinsolublesediments.Insolublesedimentsmayoverloadfilters,andplugnozzlesandinjectors.Thistestmethod,whichdoesnotrequirethetestsampletobeheated,usesaportableapparatusandallowsteststobecarriedoutonsiteorinthelaboratorytogivearesultwithin35min.Thepotentialbeneficialeffectsofstabilityadditivesinfuelsmaynotberecognizedbythistestmethod.Therefore,theactualstoragestabilityofmiddledistillatefuelswithstabilityadditivesmaynotbecorrectlyindicatedbythesetestresults.Theunstablereactivecompounds(phenalenesandphenalenones)detectedbythistestmethodmaybepresentinfuelscontainingcatalyticallycrackedorstraightrunmaterialsandcanaffectthepotentialinstabilityofthefuel.Ifthistestmethodisusedbyanypartyforarapidassessmentofstability,itistheresponsibilityofpartiesconcernedtodecidewhetherornotthisprocedureyieldsmeaningfulresults.InterpretationofresultsandcorrelationwithothertestmethodsisgiveninAppendixX1.1.1Thistestmethodcoversaprocedurefortherapiddeterminationofphenalenesandphenalenonesinmiddledistillatefuels,includingmarine,automotive,heating,andgasturbinefuelsuchasthosespecifiedinSpecificationsD396,D975,D2069,andD2880.Phenalenesandphenalenonesaffectthepotentialinstabilityoffuels,leadingtofueldegradationproductsduringstorage,whichmaycauseperformanceproblems.1.2Thistestmethodisapplicabletobothdyedandundyedfuelsatallpointsinthedistributionchainfromrefinerytoend-user.Itisnotapplicabletofuelscontainingresidualoil.Theportableapparatusallowsthewholetesttobeconductedonsiteorinalaboratoryanddoesnotrequirethetestsampletobeheated.1.3Thistestmethodissuitablefortestingsampleswitharelativeabsorbanceofupto5.00absorbanceunits(AU).Note18212;Theprecisionofthetestmethodhasbeenestablishedonrelativeabsorbanceupto1.00AU.Forrelativeabsorbanceabove1.00AUtheprecisionmaynotapply.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:E31
【国际标准分类号】:75_160_20
【页数】:5P.;A4
【正文语种】:英语


【英文标准名称】:Informationtechnology-Securitytechniques,Digitalsignatureschemesgivingmessagerecovery-Part2:Integerfactorizationbasedmechanisms
【原文标准名称】:信息技术.安全技术.带消息恢复的数字签名方案.第2部分:基于整数因子分解的机制
【标准号】:ISO/IEC9796-2-2002
【标准状态】:作废
【国别】:国际
【发布日期】:2002-10
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/IECJTC1
【标准类型】:()
【标准水平】:()
【中文主题词】:数据交换;安全;数据传输;数字的;数据安全;定义;识别;信息技术;数据处理;信息交换;签字;文本处理;数据保护;数字签名
【英文主题词】:Dataexchange;Dataprocessing;Dataprotection;Datasecurity;Datatransmission;Definitions;Digital;Digitalsignature;Digitalsignatures;Identification;Informationinterchange;Informationtechnology;Safety;Signatures;Textprocessings
【摘要】:ThispartofISO/IEC9796specifiesthreedigitalsignatureschemesgivingmessagerecovery,twoofwhicharedeterministic(non-randomized)andoneofwhichisrandomized.Thesecurityofallthreeschemesisbasedonthedifficultyoffactorizinglargenumbers.Allthreeschemescanprovideeithertotalorpartialmessagerecovery.ThemethodforkeyproductionforthethreesignatureschemesisspecifiedinthispartofISO/IEC9796.However,techniquesforkeymanagementandforrandomnumbergeneration(asrequiredfortherandomizedsignaturescheme),areoutsidethescopeofthispartofISO/IEC9796.Usersofthisstandardare,whereverpossible,recommendedtoadoptthesecondmechanism(Digitalsignaturescheme2).However,inenvironmentswheregenerationofrandomvariablesbythesignerisdeemedinfeasible,thenDigitalsignaturescheme3isrecommended.Digitalsignaturescheme1shallonlybeusedinenvironmentswherecompatibilityisrequiredwithsystemsimplementingthefirsteditionofthisstandard.However,Digitalsignaturescheme1isonlycompatiblewithsystemsimplementingthefirsteditionofthisstandardthatusehash-codesofatleast160bits.
【中国标准分类号】:L70
【国际标准分类号】:35_040
【页数】:47P.;A4
【正文语种】:英语