Test method for thermal conductivity of plastics by means of a transient line - source technique 利用瞬間線性源技術測量塑料熱傳導率的試驗方法
Standard test method for thermal conductivity of plastics by means of a transient line - source technique 用瞬變線源技術對塑料熱導性的標準試驗方法
The result shows that the sources of pollutant mainly include non - point - source , line - source and point - source , with nh ( superscript + subscript 4 ) , no ( superscript - subscript 3 ) , so ( superscript 2 - subscript 4 ) , phenanthrene , bhc , fe and mn mainly from non - point - source , nh ( superscript + subscript 4 ) , hg , cd , cod , phenanthrene , bhc mainly from line - source , and so ( superscript 2 - subscript 4 ) , dimethoate and cn ( superscript - ) from point - source 研究結果表明,地下水污染源有面源污染、線源污染、點源污染;其中屬于面源污染的污染物主要有氨氮、硝氮、硫酸根、菲、六氯環已烷、鐵和錳;屬于線源污染的污染物主要有氨氮、汞、鎘、 cod 、菲、六氯環已烷等;屬于點源污染的污染物有硫酸根、樂果、氰化物。
In the external region , heat transfer between the u - tube borehole and the ground is considered with a model of a finite line - source in a semi - infinite medium , and it is the first time to achieve an analytical solution of the temperature distribution for a such a transient two - dimensional conduction problem by means of the green - function method 對單個鉆孔的傳熱劃分為兩個區域分別進行研究。在鉆孔周圍區域,將豎直u型管的傳熱簡化為有限長線熱源的傳熱問題,采用格林函數法首次得到了有限長線熱源溫度分布的解析解。