DIN V 4001-201-1990 计算机辅助设计标准件文档.第201部分:几何和参数规范.用工具从内部驱动的有普通安装面紧公差的平头螺栓
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【英文标准名称】:CADstandardpartsfile;specificationsofgeometryandparameters;headscrews,withplainsittingsurface,withdriveinternalbytool
【原文标准名称】:计算机辅助设计标准件文档.第201部分:几何和参数规范.用工具从内部驱动的有普通安装面紧公差的平头螺栓
【标准号】:DINV4001-201-1990
【标准状态】:作废
【国别】:德国
【发布日期】:1990-09
【实施或试行日期】:
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:文档;数据处理;凹槽头紧固件;计算机应用;几何;螺钉;带帽螺钉;计算机辅助设计;计算机辅助设计;标准件数据块;设计
【英文主题词】:CAD;Computerapplications;Computer-aideddesign;Dataprocessing;Design;Files;Geometry;Headscrews;Recessed-headfasteners;Screws(bolts);Standardpartsfile
【摘要】:ThestandardisapplicableforCADrelevantproductstandardsresp.dimensionstandardsonthebasisofastructurallogicandgivesindicationsforthenecessarygeometryparametersforCADapplication,specificationsreferringtothedatasetstructureandformatandindicationsforCADrepresentationpossibilities.#,,#
【中国标准分类号】:L67
【国际标准分类号】:35_240_10
【页数】:92P.;A4
【正文语种】:德语
【英文标准名称】:StandardTestMethodforMeasuringRelativeComplexPermittivityandRelativeMagneticPermeabilityofSolidMaterialsatMicrowaveFrequencies
【原文标准名称】:微波频率下固体材料相对复介电常数和磁导率测量标准试验方法
【标准号】:ASTMD5568-2001
【标准状态】:现行
【国别】:
【发布日期】:2001
【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】:D09.12
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:电容率;回转磁的
【英文主题词】:coaxialline;dielectricconstant;magneticpermeability;measurement;microwave;millimetre-wave;permittivity;radiofrequency;rectangularwaveguide;scatteringparameter;transmission/reflection
【摘要】:DesigncalculationsforRadioFrequency(RF),microwaveandmillimeter-wavecomponentsrequiretheknowledgeofvaluesofcomplexpermittivityandpermeabilityatoperatingfrequencies.Thistestmethodisusefulforevaluatingbatchtypeorcontinuousproductionofmaterialforuseinelectromagneticapplications.Itmaybeusedtodeterminecomplexpermittivityonlyorbothcomplexpermittivityandpermeabilitysimultaneously.1.1Thistestmethodcoversaprocedurefordeterminingrelativecomplexpermittivity(relativedielectricconstantandlossindex)andrelativemagneticpermeabilityofisotropic,reciprocal(nongyromagnetic)solidmaterials.Ifthematerialisnonmagnetic,thisproceduremaybeusedtomeasurepermittivityonly.1.2Thismeasurementmethodisvalidoverafrequencyrangeofapproximately1MHzto50GHz.Theselimitsarenotexactanddependonthesizeofthespecimen,thesizeandtypeoftransmissionlineusedasaspecimenholder,andontheapplicablefrequencyrangeofthenetworkanalyzerusedtomakemeasurements.Thelowerfrequencyislimitedbythesmallestmeasurablephaseshiftthroughaspecimen,andtheupperfrequencylimitisdeterminedbytheexcitationofhigher-ordermodesthatinvalidatesthedominant-modetransmissionlinemodel.Anynumberofdiscretemeasurementfrequenciesmaybeselectedinthisfrequencyrange.Toachievemaximummeasurementaccuracy,useofdifferenttransmissionlinesizesandtypesmayberequired.Forexample,useofa7-mmdiametercoaxialgeometrycanprovideformeasurementsfrom1MHzto18GHz.However,airgapsthatexistbetweenthespecimenandthetransmissionline'sconductorsintroduceerrorsthatmaynecessitatetheuseofalargerdiametercoaxialtransmissionlineandaseriesofrectangularwaveguidesofdifferentsizetocoverthisfrequencyrange.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A42
【国际标准分类号】:17_220_01
【页数】:15P.;A4
【正文语种】:
【英文标准名称】:Meatandmeatproducts;enumerationofEscherichiacoli;colonycounttechniqueat44Cusingmembranes
【原文标准名称】:肉和肉制品.大肠杆菌的计数.在44℃用膜材料的计群法
【标准号】:ISO6391-1988
【标准状态】:作废
【国别】:国际
【发布日期】:1988-11
【实施或试行日期】:1988-11-15
【发布单位】:国际标准化组织(ISO)
【起草单位】:ISO/TC34
【标准类型】:()
【标准水平】:()
【中文主题词】:测定;农产品;食品;微生物;肉制品;微生物分析;试验;肉;细菌计数方法;细菌纲
【英文主题词】:foodproducts;testing;agriculturalproducts;microbiologicalanalysis;microorganisms;micro-organisms;bacteriacountmethods;tests;determination;bacteria;meat;meatproducts
【摘要】:
【中国标准分类号】:X09;C53
【国际标准分类号】:5325;5320
【页数】:5P;A4
【正文语种】:英语
