【英文标准名称】:Cinematography-35mmmotion-picturefilmandmagneticfilm-Cuttingandperforatingdimensions
【原文标准名称】:电影摄影.35mm电影胶片和磁膜.剪切和穿孔尺寸
【标准号】:BSISO491-2002
【标准状态】:现行
【国别】:英国
【发布日期】:2002-08-20
【实施或试行日期】:2002-08-20
【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】:涂磁胶片;电影胶片;电影胶片规格;电影摄影;孔眼;声道;切削;尺寸;未曝光底片
【英文主题词】:Cinematography;Cutting;Dimensions;Magneticfilms;Motion-picturefilm;Motion-picturefilmsize;Perforations;Rawstockfilms;Soundtracks
【摘要】:ThisInternationalStandardspecifiesthecuttingandperforatingdimensionsfor35mmunexposedmotion-picturefilmand35mmmagneticfilm,andthetypesofperforationsused.
【中国标准分类号】:G81
【国际标准分类号】:37_060_20
【页数】:14P.;A4
【正文语种】:英语


Product Code:SAE AIR1168/1
Title:Thermodynamics of Incompressible and Compressible Fluid Flow
Issuing Committee:Ac-9 Aircraft Environmental Systems Committee
Scope: The fluid flow treated in this section is isothermal, subsonic, and incompressible. The effects of heat addition, work on the fluid, variation in sonic velocity, and changes in elevation are neglected. An incompressible fluid is one in which a change in pressure causes no resulting change in fluid density. The assumption that liquids are incompressible introduces no appreciable error in calculations, but the assumption that a gas is incompressible introduces an error of a magnitude that is dependent on the fluid velocity and on the loss coefficient of the particular duct section or price of equipment. Fit 1A-1 shows the error in pressure drop resulting from assuming that air is incompressible. With reasonably small loss coefficients and the accuracy that is usually required in most calculations, compressible fluids may be treated as incompressible for velocities less than Mach 0.2. At higher velocities and for large loss coefficients (K(sub)t and 4fL/D), compressible flow analysis should be used. ould be used.