比鄰星 的英文怎麼說
中文拼音 [bǐlīnxīng]
比鄰星
英文
[天文學] proxima centauri （半人馬座; 離太陽最近的一顆恆星）-
Alpha centauri in the constellation of centaurus is just 4. 3 light years from our sun
最近的恆星位於半人馬座的比鄰星距離太陽只有In this paper, the basic characteristics of neilingding island ? s flora and their relationships with the neighboring floras were studied. the results show : ( 1 ) the vascular flora of neilingding island consists of 127 families, 367 genera and 551 species, of which 38 species of 25 genera and 20 families belongs to pteridophyta ; ( 2 ) the typical families of seed flora are lauraceae, rubiaceae, apocynaceae, annonaceae, euphorbiaceae, moraceae, aquifoliaceae, rutaceae, araliaceae, myrsinaceae, urticaceae, menispermaceae, araceae, palmae, etc. most of them also are the basic elements of cathaysian flora ; ( 3 ) 342 genera of seed plants in neilingding island can be classified to 13 types according to wu zheng - yi ? s " areal types of chinese genera of seed plant " ; the dominant geographical elements are pantropic genera ( 36. 05 % ), old world tropic ( 12. 54 % ), tropical asia ( 11. 60 % ), the total tropical elements made up to 84. 90 % of the total number of genera, but the typical and specialized tropical elements are scanty. most of them mainly distributes to sub - tropic or even to temperate zone ; ( 4 ) comparing the floristic composition of neilingding island with those of the neighboring regions, they is closely related to the flora of hong kong which is situated to the east of neilingding island. they all are belonged to the south china province of cathaysian kingdom
通過對廣東內伶仃島的維管植物區系進行全面考察、採集、鑒定和研究，結果表明: （ 1 ）共有野生維管植物127科367屬551種，其中蕨類植物20科25屬38種，種子植物107科342屬513種， 12種為廣東新記錄; （ 2 ）種子植物區系的表徵科主要有:樟科、茜草科、夾竹桃科、番荔枝科、大戟科、桑科、冬青科、蕓香科、葡萄科、五加科、紫金牛科、蕁麻科、防己科、天南星科、棕櫚科等; （ 3 ）屬的地理成分以泛熱帶分佈為主，其次為舊世界熱帶及東亞分佈; （ 3 ）通過與鄰近地區植物區系的比較，發現內伶仃島與香港植物區系相似性最高，與古田、古兜山的相似性次之，而與南崑山的相似性較低，它們均屬于華夏植物區系界的華南省。More recently, dr. rosanne di stefano also from the harvard - smithsonian centre for astrophysics and i used the chandra x - ray observatory to detect objects dubbed " quasisoft " x - ray sources in nearby galaxies because of their low temperatures, which are at most four million degrees celsius. that is well below the temperatures expected for " hard " x - ray sources such as neutron stars or stellar mass black holes - which run between 10 million and 100 million degrees celsius - and still hotter than " soft " x - ray sources like white dwarfs
最近羅珊迪史提芬路博士她亦來自哈佛大學史密森天體物理中心和筆者利用錢德拉射線天文臺在鄰近星系偵測到一種奇怪的-射線源，我們稱之為類軟射線源，因為它們的溫度最高只有攝氏400萬度，遠低於一般硬射線源，例如中子星和恆星型黑洞溫度介乎攝氏1千萬至1億度，卻又比軟射線源例如白矮星為高。For the problem of navigation planning, the selection of the navigation signpost, asteroids and the planning of the photoing sequence are important matter. this dissertation proposes criterions, including visible magnitude, distance, relative velocity, angle of sight lines, on selection of asteroids, based on the trajectory scheme of exploring ivar
對于導航小行星篩選問題，提出了基於小行星可見星等、距離、相對速度、視線夾角的篩選準則，並利用綜合評估的方式進行導航小行星的篩選;對于小行星拍照序列規劃問題，分別採用反復最鄰近法和改進的遺傳演算法進行求解，並對兩種方法進行了比較分析。分享友人