EN 60835-2-8/A1-1996 数字微波无线电传输系统设备的测量方法.第2部分:地面无线电中继系统的测量.第8节:适配补偿器

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【英文标准名称】:Methodsofmeasurementforequipmentusedindigitalmicrowaveradiotransmissionsystems-Part2:Measurementsonterrestrialradio-relaysystems-Section8:Adaptiveequalizer(IEC60835-2-8:1993/A1:1996);GermanversionEN60835-2-8:1993/A1:1996
【原文标准名称】:数字微波无线电传输系统设备的测量方法.第2部分:地面无线电中继系统的测量.第8节:适配补偿器
【标准号】:EN60835-2-8/A1-1996
【标准状态】:现行
【国别】:
【发布日期】:1996-12
【实施或试行日期】:
【发布单位】:欧洲标准学会(EN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:测量方法;传输性能;信号传输;无线电工程;无线电中继系统;数字的;无线电通信系统;数字信号;无线电装置;测量技术;传输;广播工程;陆地的;电气工程;数字工程;地面站;均衡器;微波;测量;无线电通信链路;微波链路;射频;无线电报
【英文主题词】:Adaptiveequalizers;Broadcastengineeering;Digital;Digitalengineering;Digitalsignals;Earthstations;Electricalengineering;Equalisers;Measurement;Measuringtechniques;Methodsformeasuring;Microwavelinks;Microwaves;Radioengineering;Radiolinksystems;Radiolinks;Radioplants;Radiosystems;Radiofrequencies;Radiolocationequipment;Radio-relaysystems;Radiotelegraphy;Signaltransmission;Terrestrial;Transmission;Transmissionperformance
【摘要】:
【中国标准分类号】:M35
【国际标准分类号】:33_060_30
【页数】:6P.;A4
【正文语种】:英语


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【英文标准名称】:StandardTestMethodforCreepandTimetoFailureofAdhesivesinStaticShearbyCompressionLoading(Wood-to-Wood)
【原文标准名称】:用压缩负荷静剪切法法测定胶粘剂蠕变和老化时间的标准试验方法(木材对木材)
【标准号】:ASTMD4680-1998(2004)
【标准状态】:现行
【国别】:
【发布日期】:1998
【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】:D14.30
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:蠕变;损伤;剪切强度;木材;试验;缺陷;胶粘剂
【英文主题词】:adhesive;compression;creep;shear;strain;stress
【摘要】:Creepdatathatareobtainedoverarelativelyshortperiodoftimeinthistestmethodcanprovideameasureofanadhesivebondrsquo;abilitytowithstandstaticloadinginshearoverarelativelylongperiodoftime.Creepmeasurementsaremadeoverarangeofexpectedserviceconditions,includinglevelofstress,temperature,relativehumidity,anddurationofload.Creeprate,creepstrain,andcreepmodulusarecalculatedatthevariousserviceconditions.Creepdatacanbeusedto(1)predictperformanceofanadhesiveunderlong-termloading,(2)characterizeanadhesive,(3)compareadhesiveswitheachotherandagainstspecifications,and(4)designstructuralmembersfabricatedwithanadhesive.Time-to-failuredataprovideameasureoftheultimateload-carryingabilityofanadhesivebondasafunctionoftimeatvariouslevelsofstress,temperature,andrelativehumidity.Withpropercaution,time-to-failuredataderivedfromrelativelyshortloadingperiodscanbeextrapolatedtoestimatetheusefulservicelifeofanadhesiveatworkinglevelsofstaticstress.Thispropertymayalsobeusedwithcreepdatatoaccomplishpurposeslistedin4.2.Thistestmethodisaresearchtoolintendedfordevelopmentorevaluationofnewadhesivesandnewproductdesigns.Theresearchermayselectfromsuggestedteststhosethatareappropriate.However,creepandtime-to-failuretestsarenonroutineandcanbetime-consumingandexpensive,sotestsmustbeselectedwithcare.Theapparatusandproceduresmaybesuitableformeasuringcreeppropertiesofadhesivesonsubstratesotherthanwood,suchasmetal,plastic,andglass,butsuchconsiderationsarenotwithinthescopeofthistestmethod.FIG.1CreepTestApparatus1.1Thistestmethodcoversthedeterminationoftime-dependentpropertiesofstructuraladhesivesinwood-to-woodbondswhenspecimensaresubjectedtoshearingstressesatvariouslevelsofstaticload,constanttemperature,andrelativehumidity.Apparatusandproceduresareprovidedfordirectmeasurementoftime-dependentsheardeformation(creep)andtimetofailureofadhesivebondsunderstaticload.Guidelinesforselectingtestconditions,methodsforcalculatingcreeprate,creepstrain,creepmodulus,andextrapolationoftimetofailure,aregivenalongwithmethodsofpresentingthesedata.1.2Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.TheSIunitsaregiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G38
【国际标准分类号】:
【页数】:10P.;A4
【正文语种】:


【英文标准名称】:Materialsusedincommunicationcables-PEinsulation
【原文标准名称】:通信电缆用材料.第3部分:PE绝缘材料
【标准号】:BS7878-3-1997
【标准状态】:作废
【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(BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:高温;聚乙烯;收缩;通信电缆;尺寸变化;弯曲试验;低温;通信设备;密度;电缆护套;抗拉强度;缠绕试验;质量(物质);断裂伸长;硬度试验;电阻率;热塑性聚合物;寿命;电缆;尺寸;压力试验;绝缘电缆;护套电缆;隔热
【英文主题词】:
【摘要】:MaterialsusedincommunicationcablesCommitteesresponsibleNationalforewordForewordSpecificationTable1.PEsolidinsulationcompoundsTable2.PEcellularinsulation(includingfoam-skin)
【中国标准分类号】:K15
【国际标准分类号】:29_035_20
【页数】:12P;A4
【正文语种】:英语