最小回轉面 的英文怎麼說
中文拼音 [zuìxiǎohuízhuǎnmiàn]
最小回轉面
英文
surface of revolution of minimum area-
In the wafer - cycle fitting algorithm, comparing with circumgyration radius approach, track fitting approach, and least square circle fitting approach. in the wafer pre - alignment system, the wafer square fitting algorithm - least square circle fitting approach, based on optical linear ccd sensor, as well as the theoretical error analyze of this algorithm
在晶圓檢測演算法方面，比較回轉半徑法、軌跡擬合法以及最小二乘圓法，選擇光學線陣ccd的晶圓圓心最小二乘圓法作為系統晶圓圓心的檢測方法。Disigning coolant channel on the firebox of liquid rocket engine to loxodrome ( equal - angle helix ) groove can improve firebox coolant capability greatly. because the width dimension of loxodrome groove is narrow and the depth is deep, some machining methods are incapable, such as end - milling or electrochemistry. according to the peculiarities, a cnc disk - cutter - milling method which is composed of five motion axes with four simultaneously interpolated ones is researched. because most firebox generatrix is composed of complex curves, it is very difficult to get cnc cutting program with manual means. in order to deal with the problem, the loxodrome mathematics model is studied, and an auto - programming software system is developed. the software system can generate cnc cutting program of loxodrome on many kinds of turned surface. the constriction - distension segment of firebox is the most representative workpiece. the sharp changing of its generatrix slope makes loxodrome milling difficult. with the theory analyzing and practice cutting experiment, some applied techniques, which include milling mode and direction, choosing cutter diameter and cutting start point setting, are developed. adopting the technology above, tens regular workpiece have been manufacturing. the two - year manufacture practice has confirmed the validity and feasibility of developed loxodrome coolant channel milling method. the developed technology is also worth to be referenced to other similar workpiece
將液體火箭發動機燃燒室的冷卻通道設計為斜航線（等傾角螺旋線）槽形，可以大幅度改善燃燒室的冷卻性能.斜航線冷卻槽的槽寬尺寸較小而槽深尺寸較大，所以無法使用棒銑刀銑削、電化學等加工方式.針對這些特點，提出了五軸控制、四軸聯動的數控片銑刀銑削加工方法.由於燃燒室外表面的母線輪廓復雜，手工編制數控加工程序難度大.為了解決數控加工程序的編制問題，研究了斜航線的數學模型，開發了自動編程軟體系統.使用該系統，可以生成多種母線輪廓回轉體外表面上的斜航線數控加工程序.燃燒室收斂-擴張段的母線斜率變化大，加工難度大，是斜航線冷卻通道加工的最典型工件.經過理論分析和實際切削實驗，研究了針對該類型工件的片銑刀直徑選擇、銑削方式和方向、刀具調整和起刀點的設置等多項實際的加工方案.採用上述的一系列技術，已經成功地加工了數十個合格工件.經過兩年多的實際生產過程應用，驗證了所開發的斜航線冷卻通道加工方法的正確性和可行性.這些加工技術的研製成功，對其他相似類型零件的加工亦具有參考意義A single molecule of rta is able to depurinate 1500 - 2000 ribosomes per minute. ricin b chain ( rtb ) is a galactose - specific lectin which binds to the receptors on cell surfaces, and may enhance rta translocation by forming a pore in the membrane of intracellular organelles. ricin enters the cells by receptor - mediated endocytosis
內吞進入細胞的蓖麻毒素一部分返回到膜表面，一部分經早期內體至晚期內體，最後在溶酶體中降解，只有一小部分約5到達高爾基體，隨后逆轉運到粗面內質網，在那裡rta才和rtb解離，游離出有催化活性的rta 。
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