close-to-critical range 中文意思是什麼
close-to-critical range
解釋
下臨界區-
Around 40 ; the neutral curve obtained by the growth rates of the temperature fluctuation has a ringlike curve separated from the main branch of nachtsheim s calculation by velocity fluctuation at the lower grashof number side ; and its phase velocity is close to the maximum mean velocity where the critical layer of the eigenmode locates. the thermal fluctuation decays rapidly as the nondimensional frequency above 0. 4, so that it means that the coupling effect between instability wave generated by buoyancy fluctuation and velocity waves by invicid instability seems weak enough for their critical layers in the range of the nondimensional frequency
詳細研究了自然對流邊界層中最早失穩的浮力振型的功率譜波長波速與臨界層位置等基本特徵和它為主導其他振型尚未失穩時按線性理論得到的3種相互獨立振型的振幅分佈。系統地測量了它所對應的溫度和速度漲落的振幅增長規律和中性曲線，實驗結果表明，溫度漲落的中性曲線在低格拉斯霍夫grashof數 -
The study of phase formation of the polycrystalline la1 - xagxmno a series of polycrystalline la1 - xagxmno3 samples with x range nominally from 0. 05 to 0. 45 were investigated, and found that the critical phase temperature has close relation with the content of silver in the sample. and pointed out in the case of agl + doped in lamno3, when x achieved a fixed value ( x = 0. 15 ), ag would separate out, ag - rich phase appeared, samples became compound phase
並且當銀含量達到一定程度時會有單質銀析出，我們認為這是因為銀離子在溶膠?凝膠的過程中被還原成單質，以銀團簇的形態存在於樣品中，隨著燒結溫度的提高，銀原子逐漸被氧化成銀離子，取代la ~ （ 3 + ） ，進入晶格，形成鈣鈦礦結構。
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