熱擴散器 的英文怎麼說
中文拼音 [rèkuòsǎnqì]
熱擴散器
英文
thermal discharge diffuser-
Laser induced diffusion is a technology that dope the impurities into a certain region of semiconductor by a focused laser. it has the advantages of “ low temperature processing ” and ” direct writing ”, and it is promising to use this technology in the fabrication of monolithically optoelctronic integrated circuits ( oeics ) to solve the incompatibility problem between optoelctronic and electronic components
激光誘導擴散是用聚焦的激光束局域加熱半導體基片，將雜質以擴散的方式摻入到特定區域並且達到一定要求的一種技術，具有「低溫處理」 、 「直接寫入」 、 「局域升溫」等獨特優點，可有效解決單片光電集成器件（ oeics ）中光、電兩部分的工藝兼容這一難題。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。Based on the analysis of gas - solid multiphase catalytic reaction, the chemical reaction model is established. when the reaction is controlled by the chemical dynamic, the reaction rate is introduced by consideration of the adsorption and desorption effects. when the reaction is controlled by mass transfer, the diffusion coefficient is established which can present the flow rate increases in small reynolds domain ; for the internal diffusion, the internal diffusion coefficient is derived, and then the internal diffusion is coupled with chemical reaction to represent the phenomenon that the diffusion and the chemical reaction occur cocurrently
本文在考慮催化轉化器載體內發生的傳熱傳質現象的基礎上，建立了催化轉化器的一維單孔道和三維多孔道傳熱傳質模型;在分析載體內以氣-固多相催化反應為特點的工作機理的基礎上，建立了催化轉化器的化學反應模型:當催化轉化處于化學動力學控制區時，引入了考慮吸附、表面反應和脫附的表面化學反應速率公式，當催化轉化處于質量輸運控制區時，引入了決定外擴散能力的擴散系數公式和和決定內擴散速率的內擴散系數公式，並與化學反應速率相耦合，得出由擴散過程決定的化學反應速率公式。Scandate cathode has outstanding properties of high emission at low work temperature. it ’ s the only thermionic cathode which can suffice to the development of new electronic device ’ s requirement
含鈧擴散陰極具有極其優異的低溫高電流密度的電子發射的能力，是目前唯一能滿足新型電子器件發展要求的熱陰極材料。Coupled with the curved heat exchanger, the york cooling king is also designed to operate at the lowest noise level - 29dba at low speed fan
結合彎曲的熱氣轉換器， york cooling king的噪音也是最低的只有29dba 。它具備安靜操作和寬敞空氣擴散系統的低噪音風扇葉片。In 420t / h boiler inspecting, the collecting - steam box of reheater and correlative pipelines are detected to appear diffuse crack, which has expansive trend
在對420t h鍋爐的規范檢查當中發現，再熱器集汽箱管座及其附屬管道外壁出現由內而外發散的放射狀裂紋，並且有不斷擴大的趨勢。In the second part, the reliability research on electronic packaging was concentrated with finite element method ( fem ) on moisture diffusion in plastic materials, die cracking of flip - chip with no - flow underfill and thermal performance of high power electronic components. in the last chapter, the design tool for advanced electronic package was studied. the main conclusions in the second part are as follows
論文第二部分電子封裝可靠性研究包含對塑封材料中水汽擴散研究、填充不流動膠的倒裝焊晶元可靠性研究以及大功率器件散熱問題研究三方面內容，最後為實現封裝設計標準化和自動化，研究了若干最主要的電子封裝構型的參數化有限元建模、加載和相應的求解方法。The condensation heat - exchange characteristic of a separate - type heat - pipe was studied on a 1 : 1 model. the heat pipe is heated by electricity, and working fluid is distilled water, and it is cooled by air. the experimental results show that, ( 1 ) when charging liquid ratio is 45 %, condensation heat - exchange coefficient reaches to maxium ; ( 2 ) when there is not non - condensing gas, the coeffcient decreases a little with the increase of vapour pressure, and it decreases by 9. 5 % when the pressure increases from 0. 16mpa to 0. 36mpa ; ( 3 ) when there is non - condensing gas, the coefficient decreases a little, but when the gas is discharged by an exhaust value, it can be improved, when the volume content of the gas is 2. 5 %, it can increased by 22 % ; ( 4 ) the effect of the non - condensing gas on the coefficient decreases with the increase of the pressure, and when the volume content of the gas is 5 % and the pressure increases from 0. 16mpa to 0. 36mpa, the coefficient increases by 6 %. the relative curves are given between condensation heat - exchange coefficient and air flowrate, charging liquid ratio and vapour pressure
建立了空氣冷卻實驗臺，熱管的加熱方式為電加熱，工質為蒸餾水.在1 1模型上對分離式熱管管內凝結換熱特性、不凝性氣體對凝結換熱的影響及不凝性氣體的擴散規律進行了試驗，得出分離式熱管有一最佳充液率，其值為45 %左右；凝結換熱系數隨著蒸汽壓力的增加略有降低，在實驗的壓力范圍內，降低了9 . 5 % ；不凝性氣體對分離式熱管的凝結換熱僅影響冷凝段下部較小部分，通過排氣閥排出不凝性氣體可有效地改善冷凝段下部的凝結換熱；隨著壓力的增加，不凝性氣體對分離式熱管冷凝段的影響減少.這些結論可用於分離式熱管換熱器的工程設計和控制Abstract : the condensation heat - exchange characteristic of a separate - type heat - pipe was studied on a 1 : 1 model. the heat pipe is heated by electricity, and working fluid is distilled water, and it is cooled by air. the experimental results show that, ( 1 ) when charging liquid ratio is 45 %, condensation heat - exchange coefficient reaches to maxium ; ( 2 ) when there is not non - condensing gas, the coeffcient decreases a little with the increase of vapour pressure, and it decreases by 9. 5 % when the pressure increases from 0. 16mpa to 0. 36mpa ; ( 3 ) when there is non - condensing gas, the coefficient decreases a little, but when the gas is discharged by an exhaust value, it can be improved, when the volume content of the gas is 2. 5 %, it can increased by 22 % ; ( 4 ) the effect of the non - condensing gas on the coefficient decreases with the increase of the pressure, and when the volume content of the gas is 5 % and the pressure increases from 0. 16mpa to 0. 36mpa, the coefficient increases by 6 %. the relative curves are given between condensation heat - exchange coefficient and air flowrate, charging liquid ratio and vapour pressure
文摘:建立了空氣冷卻實驗臺，熱管的加熱方式為電加熱，工質為蒸餾水.在1 1模型上對分離式熱管管內凝結換熱特性、不凝性氣體對凝結換熱的影響及不凝性氣體的擴散規律進行了試驗，得出分離式熱管有一最佳充液率，其值為45 %左右；凝結換熱系數隨著蒸汽壓力的增加略有降低，在實驗的壓力范圍內，降低了9 . 5 % ；不凝性氣體對分離式熱管的凝結換熱僅影響冷凝段下部較小部分，通過排氣閥排出不凝性氣體可有效地改善冷凝段下部的凝結換熱；隨著壓力的增加，不凝性氣體對分離式熱管冷凝段的影響減少.這些結論可用於分離式熱管換熱器的工程設計和控制The performance of devices is directly decided by the impurity distribution in the diffused region, and the impurity distribution may be affected by the material thermal properties, the mechanism of diffusion, the power of laser and the diffusion time
激光誘導擴散過程中，基片的熱物理特性、擴散源的擴散機理、激光束的功率大小和擴散時間以及光束的聚焦狀況等等，都會對擴散結果產生重要的影響，而擴散層的雜質分佈情況將直接決定器件的性能指標。分享友人