島嶼成種 的英文怎麼說
中文拼音 [dǎoyǔchéngzhǒng]
島嶼成種
英文
insular speciation-
In such islands distinct species might have been separately formed without the possibility of intermediate varieties existing in the intermediate zones.
在這些島嶼上，許多特殊的物種各自分別成立，沒有中間類型在中間地帶存在的可能性。We studied the vegetation on six pre - islands ( land areas which will become islands as a result of flooding ) in the three gorges reservoir with a focus on plant species richness for each community
摘要三峽水庫蓄水導致原有生境的島嶼化，本文調查了三峽水庫6個即將形成的島嶼蓄水前的植被特徵，並對這些島嶼上各類群落類型的物種豐富度進行了分析。Exotic plants significantly impacted the landscape, resulting in degradation of the natural vegetation
由於自然植被被嚴重破壞，島嶼上外來入侵種形成了較大的災害。In the research task supported by the key technologies r & d program in the 9th five - year plan of jiangsu province, the study focuses on the nc milling programming software development method and the corresponding algorithms on the basis of acis. by using the development interfaces provided by acis, the author has made some innovation to tool path generation algorithms. based on acis, a new set operation method of loops is presented in this paper
藉助acis提供的開發介面實現對一些刀具軌跡生成演算法的創新：提出了一種基於acis的環集合運算方法，該演算法充分利用了acis的功能，使演算法實現過程大大簡化，並提高了演算法效率；設計了一種加工區域識別演算法，該演算法可以識別出由存在復雜嵌套關系的多個型腔環和島嶼環組成的零件幾何模型中的待加工區域；提出了一種實體精加工刀具軌跡生成演算法，該演算法可以自動計算出待加工零件在一個加工方向上所有的刀具軌跡，從而在某些情況下，大大方便數控編程人員完成nc代碼的生成。Consider a nation as a collection of islands of economic activity separated by seas in which no activity occurs.
考慮一下這種情況，一個由若干島嶼組成的國家，它的經濟活動被不發生經濟活動的海洋所分割。Shiphandling simulator is a device that can partly imitate the true environment at sea ， and is specially designed to satisfy marine education and trains and maritime research etc. one of its key techniques is to create the virtual environment at sea ， and the terrain is its important component. according to the needs of the real time visual display of the shiphandling simulator ， this paper analyses the requirements of the geometry precision of the important islands and background hills which are within the ships ' visible scope ， and brings forward the modeling methods of the hill ' s pileup and the hill ' s silhouette edges based on contour lines. it also presents the definition of error that the hill ' s silhouette edges graph has been given and the effective scope of application ， and firstly established the error criterion of terrain model that is built in shiphandling simulator. with these two kinds of method ， the size of data storage can be minimized greatly ， and the requirements of high update rate and geometry precision for the real time visual display of the shiphandling simulator can be satisfied
船舶操縱模擬器是一種能夠部分模仿海上真實情況，專門為滿足航海教育與培訓、航海技術研究等目的而設計研製的裝置，其核心技術之一是海上視景模擬，而地形地貌是海上視景中的重要組成部分.根據船舶操縱模擬器實時視景顯示的需要，在分析航行船舶對可視范圍內重要島嶼與背景山脈的幾何精度要求的基礎上，提出了基於等高線的山形堆積建模和山形輪廓建模方法，並給出了山形輪廓圖形的誤差定義、有效適用范圍，以及船舶操縱模擬器中地形建模的誤差準則，該方法生成圖形的數據量較小，其圖形更新速率與幾何精度能達到船舶操縱模擬器實時視景顯示的要求One is the method of figured sea - island : this method adopts bicomponent conjugate spinning technology to produce super - fine fibers, whose cross section is made up of two types of components : one type of elements that are fine and dispersed is encircled with another, which bears a resemblance to islands amid the sea
一是定島法：它是通過雙組份復合紡絲技術製成，其纖維橫截面是一種成分以微細而分散狀態被另一種成分所包圍，很像海中島嶼，其島與海成分在纖維長度方向上是連續密集均勻分佈。分享友人