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ISO 15572-1998 辐射处理过程中剂量测定的不确定性评估指南

上一篇: ISO 15571-1998 辐射处理过程中伽玛辐射设备剂量测定操作规程
下一篇: ISO 15573-1998 能量在80KeV和300KeV之间的辐射处理的电子束设备剂量测定操作规程

标准名称：	非平衡双流接口电路的电特性
英文名称：	Electrical characteristics for unbalanced double-current interchange circuits
中标分类：	电子元器件与信息技术 >> 信息处理技术 >> 数据信息
ICS分类：	电信、音频和视频技术 >> 电信系统 >> 线路、连接和电路
发布部门：	国家标准局
发布日期：	1982-01-02
实施日期：	1983-10-01
首发日期：	1982-12-31
作废日期：	1900-01-01
主管部门：	国家标准化管理委员会
归口单位：	全国信息技术标准化技术委员会
起草单位：	标准起草工作组
出版社：	中国标准出版社
出版日期：	1983-10-01
页数：	4页

本建议所规定的电特性，适用于数据信号速率在20000比特/秒极限以下操作的接口电路。本标准与CCITT建议V.28在技术上是安全一致的。

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Product Code:SAE AIR4275
Title:Jet Reference Fluid Study for Fuel Tank Sealants
Issuing Committee:Ams G9 Aerospace Sealing Committee
Scope:Standard reference fluids, or test fluids, have long been used to evaluate the effects of hydrocarbon fuels on various materials, such as integral fuel tank sealants. Standard fluids are required because hydrocarbon fuels, such as JP-4, vary widely in composition depending on crude source, refining techniques, and other factors. To ensure reliable and reproducible results when determining the fuel resistance of materials, reference fluids of known composition, using worst case fuel compositions, are used. The current Jet Reference Fluid (JRF) called out in military sealant specifications was developed in the mid-1950s specifically as a JP-4 type test fluid formulation to be used for the accelerated laboratory testing of integral fuel tank sealants. In August 1978, chalking of the polysulfide sealant in integral fuel tanks of some new aircraft at Edwards Air Force Base in California was discovered after only 1 year of service. Although chalking of polysulfide sealants had been observed occasionally in the past, the rate of chalking was unprecedented. The results of an investigation showed that the rapid chalking of the polysulfide sealant was caused by a chemical reaction involving metal ions (copper, cadmium, lead, and iron) and mercaptan sulfur in the fuel. It was also noted that qualification testing of the sealant used had not predicted the chalking that occurred in service. Further investigation disclosed that the sealant had passed the chalking test in the military specification because the JRF used in the specifications chalking test did not contain trace metal ions as did the fuel removed from the tanks of the affected aircraft. The special Air Force investigating team included in its final report a recommendation that the JRF specification be reviewed and revised. The above chalking incident coupled with concerns resulting from deficiencies observed with the current JRF, and from changing sources of JP-4 indicated that an update of the JRF formulation in the sealant specifications was needed. A proposal was made to the SAE Aerospace Sealing Committee (G-9) which then formed a subcommittee for the development of a new Jet Reference Fluid (JRF) for evaluation of integral fuel tank sealants.

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