ASTM D 5291-2001 石油产品及润滑剂中碳、氢及氮仪器测量的标准试验方法

上一篇: ASTM D 5302a-2001 低温轻型条件下工作的用汽油作燃料的火花点火内燃机中为防止形成沉积物和防磨损用汽车发动机油评定的标准试验方法
下一篇: ASTM D 6082-2001 润滑油高温起泡特性的标准试验方法

Product Code:SAE AS3481
Title:Nut, Self-Locking, Plate, Two Lug, Floating, Reduced Rivet Spacing, Low Height, UNS S66286, Class: 125 ksi/800 掳F
Issuing Committee:E-25 General Standards For Aerospace And Propulsion Systems
Scope:No scope available.【英文标准名称】:Sensoryanalysis-Methodology-Generalguidanceformeasuringodour,flavourandtastedetectionthresholdsbyathree-alternativeforced-choice(3-AFC)procedure
【原文标准名称】:感官分析.方法学.用三点选配(3-AFC)法测定气味、香味和味觉探测阈值的通用指南
【标准号】:ISO13301-2002
【标准状态】:现行
【国别】:国际
【发布日期】:2002-09
【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/TC34
【标准类型】:()
【标准水平】:()
【中文主题词】:阈值;方法学;定义;味觉;香味;检测极限;食品;感官分析(食品);指导手册;气味测定法;方法;农产品
【英文主题词】:Agriculturalproducts;Aroma;Definitions;Detectionlimit;Foodproducts;Guidebooks;Methodologies;Methods;Odorimetry;Sensoryanalysis(food);Taste;Thresholdvalue
【摘要】:ThisInternationalStandardprovidesguidanceon:—obtainingdataonthedetectionofchemicalstimulithatevokeresponsestoodour,flavourandtastebya3-AFC(three-alternativeforced-choice)procedure;—theprocessingofthedatatoestimatethevalueofathresholdanditserrorbounds,andotherstatisticsrelatedtothedetectionofthestimulus.Typically,theprocedureswillbeusedinoneofthefollowingtwomodes:—investigationofthesensitivityofassessorstospecificstimuli;—investigationoftheabilityofachemicalsubstancetostimulatethechemoreceptivesenses.(Althoughexperimentsmayencompassbothmodes.)Examplesofthefirstmodewouldincludestudiesofthedifferencesamongindividualsorspecifiedpopulationsofindividualsinsensitivitiesandoftheeffectsofage,gender,physiologicalcondition,disease,administrationofdrugsandambientconditionsonsensitivity.Examplesofthelattermodewouldinclude:—studiesinflavourchemistryandtheimpactofspecifiedchemicalsontheflavouroffoods;—classificationofchemicalsfortheirimpactonhumans,ifpresentintheenvironment;—studiesontherelationshipofmolecularstructuretocapacityofachemicaltoactasastimulant;—qualityassuranceofgaseouseffluentsandofwater,foodsandbeverages;—studiesinthemechanismofolfaction.Inbothmodesthewayinwhichprobabilityofacorrectresponsechangeswithintensityofstimulus,i.e.theslopeofthedose/responsecurve,couldbeanimportantaspectofthestudyaswellasthethresholdvalue,andthedataprocessingproceduresdescribedhereprovidethisinformation.ThefocusofthisInternationalStandardisondatarequirementsandoncomputationalprocedures.Regardingthevalidityofthedata,thetextisrestrictedtogeneralrulesandprecautions.Itdoesnotdifferentiatebetweendetectionanddifferencethresholds;fundamentally,theproceduresmeasureadifferencethresholdbecauseatestsampleiscomparedwithareferencesample.Typically,thereferencesampleisnotintendedtocontainthestimulusunderinvestigation,buttheGuidelinesdonotexcludeexperimentaldesigninwhichthereferencecouldcontainthestimulus,oritmightnotbeknownifthereferencecontainsthestimulus.TheGuidelinesdonotmeasurearecognitionthresholdasdefinedinISO5492.TheydonotaddressthestandardizationofmethodsofdeterminingairqualityasaEuropeanStandardisinpreparation[9].
【中国标准分类号】:X04
【国际标准分类号】:67_240
【页数】:27P.;A4
【正文语种】:英语