熱突變區 的英文怎麼說
中文拼音 [rètūbiànqū]
熱突變區
英文
thermal break-
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。During the sinian, a series of catastrophic events occurred in the eastern part of the yangtze gorge, including hot, cold and gravity events
摘要長江三峽東部地區震旦紀先後發生了熱事件、冷事件、重力事件等突發性災變沉積。Building energy conservation design in this area emphasizes on reducing energy consumption of heating on the long term. however, its summer is hot and humidity high. with global warming and heat island effect, indoor thermal environment of the ground floor room of residential building has became to affect human comfort and health
寒冷地區夏季也很炎熱，夏季與秋季的濕度也很高，隨著全球變暖趨勢的繼續和城市熱島現象的加劇，寒冷地區居住建築的底層室內熱環境存在影響人體舒適與健康的問題目益突出。Dr jablonski ' s study does not, for instance, help to answer whether the tropics are a wellspring of species because a hotter climate brings a higher mutation rate, or because more intense interactions between species select for more rapid evolutionary change
例如，捷布朗斯基博士的研究未能解答究竟是因為氣候更加溫和導致更高的突變率，還是因為種間相互作用更強加速了進化上的改變，從而使得熱帶地區成為物種的發源地。Shocked by the dramatic evolution of international politics and the restructuring of the regional strategic power, the situation in central - asia has been changing greatly. five countries in central - asia as a group are playing a more and more important role in the world and becoming a strategic subregion which have the potential power to influence the pattern of international politics, economy and culture. and this region will become the hot area where the world ' s main political forces contest
冷戰結束后，在國際政治格局重大變革和地區性戰略力量重組的強烈震撼下，中亞地區形勢正在發生重大變化，戰略地位益顯突出：中亞五國正逐步作為一支集團化力量出現在國際舞臺上，已成為可能影響世界政治格局的次戰略地域；中亞地區在世界經濟體系中的地位日漸提高，將影響地緣經濟格局；世界主要文化在中亞地區的沖撞日漸加劇；中亞地區將成為世界各主要政治勢力爭奪的熱點。About 5, 000 years ago a sudden drying converted the sahara from a green landscape dotted with lakes to the scorching, sandy desert it is today
約5000年前，一次突發性的旱災，將撒哈拉地區湖泊密布的翠綠景觀，變成如今黃沙漫天的炙熱荒漠。By a process of elimination, therefore, the three researchers were left with the conclusion that, by pushing metabolic rates up, tropical heat causes more mutation and thus more speciation
因此，三位研究人員得到如下結論：由於代謝速度的提升，熱帶地區的熱量引起更多的突變，也因此形成更多的物種。分享友人