IEC 61305-3-1995 家用高保真音响设备和系统测量和规范性能的方法第3部分:放大器

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【英文标准名称】:Waterquality-Determinationofbiochemicaloxygendemandafterndays(BODn)-Dilutionandseedingmethodwithallylthioureaaddition
【原文标准名称】:水质.数天后生化需氧的测定.加入烯丙基硫醇的稀释和接种法
【标准号】:BSEN1899-1-1998
【标准状态】:现行
【国别】:英国
【发布日期】:1998-12-15
【实施或试行日期】:1998-12-15
【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】:生物化学;定义;定义(术语);测定;稀释;稀释法;擒纵机构;数学计算;方法;氮化合物;氧;需氧量;质量;抽样方法;试验结果;试验;疫苗;水;水质分析;水常规(实验);水质;水域
【英文主题词】:Biochemistry;Definition;Definitions;Determination;Dilution;Dilutionmethods;Escapementmechanisms;Mathematicalcalculations;Methods;Nitrification;Oxygen;Oxygendemand;Quality;Samplingmethods;Testresults;Testing;Vaccines;Water;Wateranalysis;Waterpractice;Waterquality;Waters
【摘要】:ThisEuropeanStandardspecifiesadeterminationofthebiochemicaloxygendemandofwatersbydilutionandseedingwithsuppressionofnitrification.Thisstandardisapplicabletoallwatershavingbiochemicaloxygendemandsgreaterthanorequaltothelimitofdetermination3mg/lofoxygenandnotexceeding6000mg/lofoxygen.Forbiochemicaloxygendemandsgreaterthan6000mgofoxygen/l,themethodisstillapplicable,buttheerrorscausedbythenecessarydilutionscaninfluencetheanalyticalqualityofthetestmethodandtheresultsaretobeinterpretedwithcircumspection.Inthisstandardthelimitofdetection,DL,isdefinedasDL=t0,95(f)·2·sB·1+1/n(1)wheresBisthewithinseriesstandarddeviation,t0,95(f)isthestudentt-value,withfisthedegreesoffreedomforthedeterminationofsBandnisthenumberofanalysisfordeterminationoftheblankinananalyticalseries,sBiscalculatedfromdeterminationsofrealsampleswithaBODcontentneartheestimatedDL.Incaseswheretheanalyticalmethoddoesnotrequireanyblankcorrectiontheterm1+1/n(2)isomitted.Theresultsobtainedaretheproductofacombinationofbiochemicalandchemicalreactions.Theydonothavetherigorousandunambiguouscharacterofthoseresultingfrom,forexample,asingle,well-defined,chemicalprocess.Nevertheless,theyprovideanindicationfromwhichthequalityofwaterscanbeestimated.Thetestcanbeinfluencedbythepresenceofvarioussubstances.Thosewhicharetoxictomicroorganisms,forexamplebactericides,toxicmetalsorfreechlorine,willinhibitbiochemicaloxidation.Thepresenceofalgaeornitrifyingmicroorganismscanproduceartificiallyhighresults.Itisabsolutelyessentialthattestsconductedaccordingtothisstandardarecarriedoutbysuitablyqualifiedstaff.AnnexAdescribesalternativeincubationperiods.AnnexBdescribesmultitesting,whichcanbeusedtoobtainenhancedprecisionortodemonstratethepresenceofsubstancestoxictomicroorganisms.
【中国标准分类号】:Z16
【国际标准分类号】:13_060_50
【页数】:14P.;A4
【正文语种】:英语


【英文标准名称】:Electroacoustics.Hearingaids.Methodsforcharacterisingsignalprocessinginhearingaidswithaspeech-likesignal
【原文标准名称】:电声学.助听器.带类语音信号助听器的特征化信号处理方法
【标准号】:BSEN60118-15-2012
【标准状态】:现行
【国别】:英国
【发布日期】:2012-05-31
【实施或试行日期】:2012-05-31
【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】:声学测量;声学性质和声学现象;声学试验;声学;电声器件;听力计;听觉阈;数据;定义;耳;电声学;频率;频率测量;功能特性;听觉能力;助听器;听力(听觉保护);信息交换;测量;测量条件;测量仪器;测量技术;噪声;噪声(环境的);公称尺寸;精密度;性能;质量检验;额定值;灵敏度;信号处理;信号;声音;声场;声压级;声源;规范(验收);语音清晰度;测试信号;试验;试验条件;传输;传输特性
【英文主题词】:Acousticmeasurement;Acousticpropertiesandphenomena;Acoustictesting;Acoustics;Acoustoelectricdevices;Audiometers;Auditorythreshold;Data;Definitions;Ears;Electroacoustics;Frequencies;Frequencymeasurement;Functionalproperties;Hearingability;Hearingaids;Hearing(auditoryperception);Informationinterchange;Measurement;Measurementconditions;Measuringinstruments;Measuringtechniques;Noise;Noise(environmental);Nominalsizes;Precision;Properties;Qualitytesting;Ratings;Sensitivity;Signalprocessing;Signals;Sound;Soundfields;Soundpressurelevel;Soundsources;Specification(approval);Speechintelligibility;Testsignals;Testing;Testingconditions;Transmission;Transmissioncharacteristics
【摘要】:
【中国标准分类号】:
【国际标准分类号】:11_180_15
【页数】:36P;A4
【正文语种】:英语