circle n. 1.圓;圓周;圈;環(huán);環(huán)狀物。 2.圓形場地,馬戲場;(鐵路的)環(huán)行交叉口;(體育場的)圓形看臺;(劇場的)樓廳。 3.周期,循環(huán);(天體運行的)軌道;(體操的)環(huán)轉運動;【邏輯學】循環(huán)論法〔= vicious circle〕;(科學等的)完整體系,整體。 4.黨派,圈子,集團,…界,(活動、勢力、思想等的)范圍。 the Arctic [Antarctic] C- 北極[南極]圈。 circle of acquaintance 交際圈。 the dress circle(戲院的)花樓;月樓。 the upper circle 樓廳后座。 the upper circles 上層社會。 business [military, political] circles 實業(yè)[軍、政]界。 (have) a large circle of friends 交游廣闊。 a swing around [round] the circle 發(fā)表政見的巡回旅行。 a vicious circle 1. 惡性循環(huán)。 2. 【邏輯學】循環(huán)論證。 circle of illumination 【天文學】晝夜分界圈。 circle of latitude [longitude] 【天文學】黃緯[黃經]圈。 circle of vegetation 【生物學】群落環(huán)。 come full circle 繞了一圈,兜了一個圈子。 full circle (thinking) 充分的(考慮)。 go all round the circle (話)婉轉,兜圈子。 in a circle 成圓形地,圍著(…坐)( argue in a circle用循環(huán)論法論證)。 run round in circles 〔口語〕忙得團團轉。 square the circle 求與圓面積相等的正方形;試圖做不可能的事,妄想。 vt. 圍,環(huán)繞;繞過。 vi. 1.盤旋,環(huán)行,兜圈子;旋轉,回轉。 2.流傳。
During this paper, definition of the measure enter-cover-probability is given, andthree-dimension detection space are transformed to level detection circles on differentheights . aiming at the most normal situation of symmetric line, cross-to line and cross-awayline taken by the carrier, probablely-enter-cover-target-distribution are analysed in relativemovement method on the premise that targets fly perpendicular to the flying direction of thecarrier . mont-cario method is used to simulate uniformly-distributed-targets situation and getthe measure, and results are used to analyse the influence of line-landscape-orientation-ratio, line-portrait-ratio, and speed-ratio on the measure . for further research, influences of height and blind space are also discussed on base ofradar level detection range, and situations of non-uniformly-distributed targets are alsoresearched 為了分析主動探測空間動態(tài)性能,本文首先提出以“目標進入雷達覆蓋區(qū)概率”(簡稱為“覆蓋率”)作為評價指標;然后將三維探測空間轉換為不同高度層對應的水平探測圓,針對載機采用雙平行航線、交叉相向航線和交叉同向航線的最一般情形,采用相對運動的方法,分析目標垂直入侵時可能進入雷達覆蓋區(qū)的目標分布情況;再運用蒙特卡洛法進行仿真計算,分析并比較目標服從均勻分布時航線橫比、航線縱比及速度比對性能的影響。
Secondly, according to the basic theory of the general spectrometer, in this paper we discuss the fundamental, the compositions and the characters of tcecs . we analyze the main influencing factors for resolving power, such as the dispersion of the x-ray on the detection circle, spectra location error and the aperture width etc . and we put out the ways to resolving the problems 接下來,本文根據經典光譜儀器的基本理論,著重討論了雙通道橢圓彎晶譜儀的基本原理,及其基本組成和基本特性,并從x射線波長在探測圓上的彌散度、光度參數與探測角之間的關系、狹縫寬度等方面對譜儀的精度和分辨率的影響作了一定的分析,并提出了解決問題的辦法。