演化勢頭 的英文怎麼說
中文拼音 [yǎnhuàshìtóu]
演化勢頭
英文
evolutionary momentum-
Niche breadth of four dominate populations at three age groups was studied by the methods of resource utilization ability and ratio. the result shows that : symplocos sectchuanensis is a typical gengeration species whi ch resource utilization ability is strong, and distribution is wide. meanwhile, go rdonia acuminata, castanopsis fargesis and pinus massoniana specialized at some d egree in resource utilizationm, their distribution is limited. especially, the ju venile of pinus massoniana specialized outstandingly. with the devlopment of pinu s massoniana, which is the pioneer population in mt. jinyun, the environment become s unfit to it ' s juvenile. it turns to needle and evergreen broad - leaves mixed fo r est. because the tolerance toward shading of gordonia acuminata is lower than tha t of castanopsis fargesis, gordonia acuminata will be substituted by castanopsis fargesis and other evergreen broad - leaves species are the edificators. the popul ation ' s ability of resource utilization is the inner factor of population distri bution and community succession. the distribution of light and the concentrate of nutrient ( such as n ) is the outer factors of community succession
對縉雲山森林植被的4個優勢種群3個年齡級生態位寬度進行了研究.結果表明，川灰木利用資源的能力最強、分佈廣，為典型的泛化種.大頭茶、栲樹、馬尾松對資源的利用在一定程度上特化，分佈上有一定的局限性.馬尾松的中齡組與幼齡組特化現象十分顯著.縉雲山森林植被的先鋒種馬尾松的發展，導致環境的改變不適于其幼齡個體的生長，群落演替到針闊葉混交林階段，最後發展為以栲樹等為建群種的常綠闊葉林.種群的資源利用能力，是種群分佈與群落演替的內在原因，光因子和營養元素（如n ）是群落演替的主要外部動力Sportswear and streetwear trends. street style, sportswear, jeans, casual, active and leisurewear. street fashion in london, paris, new york, milan, amsterdam, tokyo and florence. trade fair reports
演繹世界各地的街頭（時尚運動）服裝文化，及其國際知名品牌展現街頭服和休閑服的流行趨勢的大量廣告圖！The dissertation focus on the main conflict of flow and sediment change, by analyzing the flow and sediment features, and change in rivercourse of typical period in histry, collecting the data of riverbed change. according to the flow and sediment change condition, combining the existed water works, and based on the results of former researches, the study are conducted on the law of flow state change by comparing rivercourse conditions before and after the completion of sanmenxia project, which may provide some idea for flow state change when xiaolangdi project completed and put into operation and some basic clue for the prediction of variation trend of river section from tiexie to shendi, from shendi to tieqiao near zhengzhou, from tieqiao near zhengzhou to dongbatou, from dongbatou to gaocun and so on in the year 2010 and the period 2010 to 2020. the result may provide some reference for flood control of these wangdering river sections, and some guidelines for planning of water projects and arrangement of project sequence
本課題緊緊抓住小浪底水庫運用后水沙變化這一主要矛盾，通過分析研究以往典型時期的水沙特點和河道演變特點，收集分析河床邊界條件變化資料，小浪底水庫運用后水沙資料變化，結合現有河道整治工程建設情況，總結前人的研究成果，重點研究三門峽水庫運用後下遊河道河勢變化的規律和特點，探索小浪底水庫運用後下遊河勢變化情況，分析預測游蕩性河道鐵謝至神堤、神堤至鄭州鐵橋、鄭州鐵橋至東壩頭、東壩頭至高村等各個河段在2010年， 2010年至2020年期間的河勢變化趨勢，為分析游蕩性河段的防洪形勢，指導河道整治工程建設的規劃和工程安排提供決策參考和依據。The thesis was written under the direction of dynamic theory of forming reservoir, follows the rules of comprehensive information, judgment, interpretation and assessment and even makes full use of outcrop geology, data from drilling and logging, data from laboratory analysis and achievements in geophysical exploration. considering the basic factors of forming reservoir in the south of ordos basin as the starting point, the thesis defines that yanchang group of triassic goes into the start of generating oil in the late period of mid - jurassic and that the largest oil generation peaks in the middle period of early cretaceous, after the analogue - history of hydrocarbon generation. meanwhile it also establishes the relationship between the evolution of oil and gas and the formation of traps, the time of oil exploration
本文以成藏動力學理論為指導，本著綜合信息、綜合判斷、綜合解釋、綜合評價的原則，充分利用露頭地質，鉆測井資料，實驗分析資料及物化探成果，以鄂爾多斯盆地南部的基本成藏要素為出發點，通過生烴史模擬，確定了三疊系延長組在中侏羅晚期（ 150ma ）進入生油門限，于早白堊世中期達到最大生油高峰期；同時並確立了油氣演化與圈閉形成、捕油時間的關系；通過流體勢的全區計算，提出了該區油勢具有明顯的「雙層」結構特徵，並建立了以靜水壓力為主的重力流系統和以差異壓實作用為主的壓實流系統的流體動力分佈模型；通過成藏動力學系統的劃分及事件分析，探討了該地區油氣聚集規律，最終指出了有利的含油氣遠景區。Based on the analyses of the flow and sediment characteristics and evolution trend of the river bed of the fuling reach in the yangtze river before and after the impoundment of the three gorges reservoir, the water level, velocity variation and influenced range in the fuling reach before and fifty years after the operation of the three gorges reservoir with the construction of the fuling dock and four discharge combinations are calculated by using a two - dimensional flow mathematic model
摘要在分析長江涪陵段的水沙特性和三峽水庫蓄水前後該河段河床演變趨勢的基礎上，運用二維水流數學模型，分析了4種流量組合情況下在三峽水庫運用前和運用50年，涪陵港區碼頭修建前後的水位、流速變化及其影響范圍。The authors further note that the new wings did not re - evolve from scratch ; genetic blueprints seem to have lain in wait for at least 50 million years, until flight was favored over fecundity ( wingless insects tend to lay more eggs )
他們進一步指出，新的翅膀並非重頭開始再演化的結果，相關的遺傳藍圖似乎已蟄伏了5000萬年以上，直到飛行在繁殖上取得優勢后才重出江湖（無翅昆蟲通常比較多產） 。分享友人