JGJPDF 51-1990. 轻集料混凝土技术规程
作者:标准资料网 时间:2024-05-13 08:22:34 浏览:9600
来源:标准资料网
基本信息
| 标准名称： | 轻集料混凝土技术规程 |
| 发布日期： | 1990-01-01 |
| 实施日期： | 1990-01-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 1900-01-01 |
| 出版日期： | 1900-01-01 |
适用范围
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前言
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目录
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引用标准
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所属分类： 工程建设 工业与民用建筑工程 建筑构造与装饰工程 建筑材料和建筑物 建筑构件 屋顶
【英文标准名称】:1/10conicalshaftends
【原文标准名称】:1/10圆锥形轴端
【标准号】:JISB0904-1995
【标准状态】:作废
【国别】:日本
【发布日期】:1995-02-01
【实施或试行日期】:
【发布单位】:日本工业标准调查会(JISC)
【起草单位】:TechnicalCommitteeonMachineElements
【标准类型】:()
【标准水平】:()
【中文主题词】:键;主动轴;螺钉;轴端
【英文主题词】:shaftends;driveshafts;screws(bolts);keys(engineering)
【摘要】:
【中国标准分类号】:J05
【国际标准分类号】:21_120_10
【页数】:7P;A4
【正文语种】:日语
Product Code:SAE AIR1168/2
Title:Heat and Mass Transfer and Air-Water Mixtures
Issuing Committee:Ac-9 Aircraft Environmental Systems Committee
Scope:Heat transfer is the transport of thermal energy from one point to another. Heat is transferred only under the influence of a temperature gradient or temperature difference. The direction of heat transfer is always from the point at the higher temperature to the point at the lower temperature, in accordance with the second law of thermodynamics. The fundamental modes of heat transfer are conduction, convectoin, and radiation. Conduction is the net transfer of energy within a fluid or solid occurring by the collisions of molecules, atoms, or electrons. Convection is the transfer of energy resulting from fluid motion. Convection involvs the processes of conduction, fluid motion, and mass transfer. Radiation is the transfer of energy from one point to another in the absence of a transporting medium. In practical applications several modes of heat transfer occur simultaneoulsy. For example, aerodynamic heating of a vehicle surface includes convection to the surface, radiation away from the surface, and conduction through the surface structure. Since the three modes of heat transfer obey different laws, a real insight into such a problem can be gained only after they have been studied separately.
