国语自产拍在线观看对白,丁香婷婷综合网,中文字幕人妻丝袜成熟九色,国内黑屌操美女

產(chǎn)品列表PRODUCTS LIST

首頁 > 測(cè)試服務(wù) > TC3000 Thermal Conductivity
TC3000 Thermal Conductivity
點(diǎn)擊次數(shù):2260 更新時(shí)間:2014-09-01

 

Thermal conductivity measuring methods can be divided into steady-state method and non-steady-state method by macroscopic mechanism of thermal conductivity. 

Steady-state method requires long period ,and there are also many other factors which affect measuring accuracy. However, non-steady-state method has the advantage of short measuring time, high accuracy and low requirements for operational environment. Especially, the transient hot-wire method has been considered internationally as the best measuring method of thermal conductivity in the research area of thermal conductivity.

 

Measuring Principle

The origin of hot-wire method could be traced back to the year 1780 when an American scientistJoseph Priestley made the first experiment about heat transfer ability of air. In 1931,Stâlhane and Pyk, who are the first to adopt transient hot-wire method in measuring the thermal conductivity of solid, powder and liquid,  Hot-wire method is now widely used in gas, liquid, solid, metal fusion and so on. 

 
辽源市| 郁南县| 桑植县| 滨海县| 乌拉特前旗| 定西市| 民勤县| 乐亭县| 高陵县| 博爱县| 深圳市| 施秉县| 香格里拉县| 南部县| 松滋市| 罗田县| 宁津县| 清新县| 青川县| 仪陇县| 全南县| 铜陵市| 沈阳市| 镇原县| 贵德县| 河南省| 大同县| 泾川县| 黔江区| 宁晋县| 花垣县| 库车县| 南陵县| 兰坪| 龙游县| 汉寿县| 天水市| 大同县| 铜陵市| 扶绥县| 乐亭县|