BS EN 2650-1997 头部加螺纹的钝化耐蚀钢制盘形头有槽螺钉.等级:600MPa(环境温度)/425℃

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【英文标准名称】:Screws,panhead,slotted,threadedtohead,incorrosionresistingsteel,passivated-Classification:600MPa(atambienttemperature)/425°C
【原文标准名称】:头部加螺纹的钝化耐蚀钢制盘形头有槽螺钉.等级:600MPa(环境温度)/425℃
【标准号】:BSEN2650-1997
【标准状态】:现行
【国别】:英国
【发布日期】:1997-01-15
【实施或试行日期】:1997-01-15
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:航空航天运输;航空运输;航空器;凸头螺钉;耐腐蚀钢;交货条件;设计;名称与符号;尺寸公差;尺寸规格;紧固件;耐热的;作标记;质量(物质);材料;盘头螺钉;钝化;特性;螺钉(螺栓);一字槽头螺钉;槽头紧固件;航天运输;规范(验收);钢;表面处理;螺纹
【英文主题词】:Aerospacetransport;Airtransport;Aircraft;Cheeseheadscrews;Corrosion-resistantsteels;Deliveryconditions;Design;Designations;Dimensionaltolerances;Dimensions;Fasteners;Heat-resistant;Marking;Mass;Materials;Panheadscrews;Passivated;Properties;Screws(bolts);Slottedscrews;Slotted-headfasteners;Spacetransport;Specification(approval);Steels;Surfacetreatment;Threads
【摘要】:Thisstandardspecifiesthecharacteristicsofscrews,panhead,slotted,threadedtohead,incorrosionresistingsteel,passivated.Classification:600MPa/425℃note:1)Minimumtensilestrengthofthematerialatambienttemperature2)Maximumtemperaturethatthescrewcanwithstandwithoutcontinuouschangeinitsoriginalcharacteristics,afterreturntoambienttemperature.Themaximumtemperatureisdeterminedbythematerial.
【中国标准分类号】:V20
【国际标准分类号】:49_030_20
【页数】:12P;A4
【正文语种】:英语


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【英文标准名称】:Magneticresonanceequipmentformedicalimaging-Part1:Determinationofessentialimagequalityparameters
【原文标准名称】:医疗成象磁共振设备.第1部分:测定实际成象质量参数
【标准号】:IEC62464-1-2007
【标准状态】:现行
【国别】:国际
【发布日期】:2007-01
【实施或试行日期】:
【发布单位】:国际电工委员会(IX-IEC)
【起草单位】:IEC/SC62B
【标准类型】:()
【标准水平】:()
【中文主题词】:验收检验;验收试验;稳定性试验;定义;诊断(医学);电气工程;电医学;图例;图像增强器;图象质量;成象;检验;磁共振设备;测量技术;医疗器械;医疗放射照相术;医学科学;医疗技术学;质量;质量保证;射线摄影;辐射摄影术;辐射学;射线检查;额定值;安全工程;扫描方法;试验;试验条件;X-射线;X-射线仪;X-射线设备;X-射线检验;X-射线技术
【英文主题词】:Acceptanceinspection;Acceptancetests;Constancytesting;Definitions;Diagnosis(medical);Electricalengineering;Electromedicine;Illustrations;Imageintensifiers;Imagequality;Imaging;Inspection;Magneticresonanceequipment;Measuringtechniques;Medicalequipment;Medicalinstruments;Medicalradiography;Medicalsciences;Medicaltechnology;Quality;Qualityassurance;Qualityrequirements;Radiographs;Radiology;Radioscopy;Ratings;Safetyengineering;Scanningmethods;Testing;Testingconditions;X-ray;X-rayapparatus;X-rayequipment;X-rayexamination;X-raytechnique;X-rays
【摘要】:ThisinternationalstandardspecifiesmeasurementproceduresforthedeterminationofmanyessentialmedicalMREQUIPMENTimagequalityparameters.Measurementproceduresasaddressedinthisstandardaresuitablefor:-qualityassessmentintheACCEPTANCETEST;-qualityassuranceintheCONSTANCYTEST.Inaddition,themeasurementproceduresspecifiedinthisstandardmayalsobeusefulfortypetests,althoughthatisnotanobjectiveofthisstandard.Thisstandarddoesnotaddress:-requiredlevelsofperformanceforACCEPTANCETESTandCONSTANCYTEST;-imagequalityassessmentofhighfieldMREQUIPMENTgreaterthan4T,ifnototherwisestated;-imagequalityaffectedbyMR-compatibilityissues;-specialdiagnosticproceduressuchasflowimaging,perfusion,diffusion,radiotherapyandimage-guidedtherapyapplications;-typetests.ThescopeofthisstandardisalsolimitedtomeasuringimagequalitycharacteristicsinTESTDEVICES,notinPATIENTimages.Themeasurementproceduresspecifiedinthisstandardaredirectedto:a)MANUFACTURERS,whocandemonstratecompliancebyperformingacceptanceandconstancymethodsasdescribedbythisstandard,b)testhouses,whichcanconfirmperformanceofMREQUIPMENTusingmethodsdescribedinthisstandard,c)regulatoryauthorities,whocanreferencethisstandard,andd)RESPONSIBLEORGANISATIONSwhowanttoperformACCEPTANCEandCONSTANCYTESTSusingmethodsdescribedinthisstandard.Theessentialimagequalityparametersandmeasurementmethodologiesdefinedinthisstandardare:-SIGNAL-TO-NOISERATIO,-UNIFORMITY,-SLICETHICKNESSandSLICEPROFILE,-GEOMETRICDISTORTION,-SPATIALRESOLUTION,and-ghosting.Thisstandarddescribesthepreferredmeasurementprocedures.ItalsodescribesalternativemethodsinAnnexA.Thepreferredtestmethodsmaybesubstitutedwiththealternativemethods.Ifnecessary,othermethodsnotdescribedinthisstandardmaybeused,providedtheseothertestmethodsaredocumentedandvalidatedagainstthemethodsdescribedinthestandard.Validationofothertestmethodsrequiresananalysisoftestsensitivitytothesameparameterofinterestandananalysisoftheinsensitivityofthetesttootherunrelatedparametersandshoulddemonstrateasimilar,orbetter,levelofsensitivitytothesameparameterofinterestandasimilar,orbetter,levelofrobustnessagainstunrelatedparameters.Allmethodsshallproducequantitativeresults.Therationaletothepreferredandalternatemethods,andtheirpitfalls,aredescribedinAnnexB.ThisstandardalsopresentsrequirementsforCONSTANCYTESTSsuitableforMREQUIPMENTqualityassuranceprogramsconcerningessentialimagequalityparameters.TherearenopreferredCONSTANCYTESTmethods,toprovideflexibilityinusingexistingautomatedprocedureswhereavailable,butsuggestedexamplesoftestmethodsarefoundinAnnexA.Ifnecessary,otherCONSTANCYTESTmethodsnotdescribedinthisstandardmaybeused.SincetheneedsofRESPONSIBLEORGANISATIONS'qualityassuranceprogramsmayvary,RESPONSIBLEORGANISATIONSareencouragedtodeterminethenecessaryscopeoftests,qualityofthetests,andthesensitivityofthedataanalysisetc.Thisstandardplacesanemphasisonconsistentlyrepeatable,automatedmeasuringtoolsthatfacilitatetrendanalysisandthefrequentquicktestingofasmallsetofimportantparameterswhicharesensitivetotheoveralloperatingcharacteristicsoftheMREQUIPMENT.
【中国标准分类号】:C43
【国际标准分类号】:11_040_50;35_240_80
【页数】:157P;A4
【正文语种】:英语


基本信息
标准名称:肥皂中总游离碱含量的测定
中标分类: 轻工、文化与生活用品 >> 日用化工品 >> 牙膏、肥皂、洗涤剂
替代情况:调整为QB/T 3749-1999
发布日期:1900-01-01
实施日期:1987-12-01
首发日期:1900-01-01
作废日期:1900-01-01
出版日期:1900-01-01
页数:2页
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所属分类: 轻工 文化与生活用品 日用化工品 牙膏 肥皂 洗涤剂