熱封閉作用 的英文怎麼說
中文拼音 [rèfēngbìzuòyòng]
熱封閉作用
英文
heat blocking action-
At the initial stage of planar technique, b was employed as ideal diffusion impurity in base - region of npn si planar devices because of the match of its solid - solubility and diffusion coefficient in si with those of p in emission - region, and the good shield effect of sio2 film to b. but because of the relatively large solubility ( 5 1020 / cm3 at 1000 ) and the small diffusion coefficient, the linear slowly - changed distribution of acceptor b in pn junction can not be formed, which could not cater to the requirement of high - reversal - voltage devics. thereafter b - a1 paste - layer diffusion technology and close - tube ga - diffusion technology had been developed, while the former can lead to relatively large the base - region deviation and abruptly varied region in si, which caused severe decentralization of current amplification parameter, bad thermal stability and high tr ; the latter needed the relatively difficult pack technique, with poor repeatability, high rejection ratio, and poor diffusion quality and productio n efficiency
在平面工藝初期,由於b在硅中的固溶度、擴散系數與n型發射區的磷相匹配, sio _ 2對其又有良好的掩蔽作用,早被選為npn硅平面器件的理想基區擴散源,但b在硅中的固溶度大( 1000時達到5 10 ~ ( 20 ) ,擴散系數小, b在硅中的雜質分佈不易形成pn結中雜質的線性緩變分佈,導致器件不能滿足高反壓的要求,隨之又出現了硼鋁塗層擴散工藝和閉管擴鎵工藝,前者會引起較大的基區偏差,雜質在硅內存在突變區域,導致放大系數分散嚴重,下降時間t _ f值較高,熱穩定性差;後者需要難度較大的真空封管技術,工藝重復性差,報廢率高,在擴散質量、生產效率諸方面均不能令人滿意。This layout can stop the internal arc fault expansion ; can avoid harmful moisture, small animal and dusty interferences. it also has good perfomiance and high reliability. because the heat cannot transmit to the outside of the bus room, a good operation environment for the low space can be obtained
主母線室置於箱體頂部一個單獨的金屬封閉的間隔內,並與10kv開關室、儀表室等間隔相互獨立,為同類產品首創;這種結構可以防止內部電弧故障的擴大化,避免「火燒聯營」事故;防護性能好,防潮、防小動物侵害、防積塵,運行可靠;由於母線室的隔熱作用,為下層空間創造了一個較好的運行環境。With a change of stencil and perhaps an adaptation to the enclosed print head, a stencil printer may be used as needed to deposit solder paste, adhesive, flux, encapsulants or thermal interface materials
鋼網改變和調整至閉合印刷頭,鋼網印刷機用作錫膏印刷,紅膠水印刷,松香,密封劑或其他的熱表面材料。Ground source heat pump ( gshp ) air conditioning systems utilize ground soil as a heat source / sink, achieve heat transfer between the ground soil and a working fluid ( water or antifreeze solution ) circulating in a closed loop buried in the ground
地源熱泵空調系統利用大地作為冷熱源,通過中間介質在埋設于地下的封閉環路中循環流動,與大地進行熱量交換,進而由熱泵實現對建築物的空調。分享友人