【英文标准名称】:Specificationforshortpitchtransmissionprecisionrollerchainsandchainwheels
【原文标准名称】:短节距传动精密滚子链条和链轮规范
【标准号】:BS228-1984
【标准状态】:作废
【国别】:英国
【发布日期】:1984-06-29
【实施或试行日期】:
【发布单位】:英国标准学会(BSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:动力传动系统;断裂荷载;扁节链;链节距;荷载;链传动;机械传动系统;齿形;优先数;自行车和摩托车零件;链环;链条;检验荷载;尺寸;作标记;链轮;长度;直径;名称与符号;孔;抗拉强度;精密度;滚柱
【英文主题词】:
【摘要】:
【中国标准分类号】:J18
【国际标准分类号】:
【页数】:20P;A4
【正文语种】:英语


【英文标准名称】:StandardTestMethodforRelativeMolecularMass(MolecularWeight)ofHydrocarbonsbyThermoelectricMeasurementofVaporPressure
【原文标准名称】:蒸气压力热电测量法测定烃类相对分子质量(分子量)的标准试验方法
【标准号】:ASTMD2503-1992(2007)
【标准状态】:现行
【国别】:美国
【发布日期】:1992
【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】:D02.04.0D
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:hydrocarbons;molecularweight;osmometer;relativemolecularmass;thermoelectricmeasurement;vaporpressure;Hydrocarbons;Molecularweight;Relativemolecularmass;Vaporpressure(VPx)--petroleumproducts
【摘要】:Relativemolecularmass(molecularweight)isafundamentalphysicalconstantthatcanbeusedinconjunctionwithotherphysicalpropertiestocharacterizepurehydrocarbonsandtheirmixtures.Aknowledgeoftherelativemolecularmass(molecularweight)isrequiredfortheapplicationofanumberofcorrelativemethodsthatareusefulindeterminingthegrosscompositionoftheheavierfractionsofpetroleum.1.1Thistestmethodcoversthedeterminationoftheaveragerelativemolecularmass(molecularweight)ofhydrocarbonoils.Itcanbeappliedtopetroleumfractionswithmolecularweights(relativemolecularmass)upto3000;however,theprecisionofthistestmethodhasnotbeenestablishedabove800molecularweight(relativemolecularmass).Thistestmethodshouldnotbeappliedtooilshavinginitialboilingpointslowerthan220x00B0;C.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Forspecifichazardstatements,5.2.1,5.2.3,and5.2.3.
【中国标准分类号】:G16
【国际标准分类号】:75_080
【页数】:3P.;A4
【正文语种】:英语