種的均勻度 的英文怎麼說
中文拼音 [zhǒngdejūnyúndù]
種的均勻度
英文
species evenness or equitability-
Abstract : we have studied theoretically a beat effect in a four - level system due to fifth - order optical polarization, and considered the cases that the pump beams have either narrowband or broadband linewidth. we have found that the accuracy for the energy - level splitting measurement is determined by the homogeneous linewidths of the optical transitions. that is to say, this technique can achieve doppler - free precision in the measurement of the energy level splitting between two excited states which are dipolar forbidden from the ground state
文摘:研究了四能級系統中基於五階極化的拍頻效應,考慮了抽運光束為窄帶線寬或寬帶線寬的情形.發現其對能級分裂的測量精度決定於光學躍遷的均勻增寬.也就是說,這種技術在測量與基態是偶極禁戒躍遷的兩激發態之間的能級分裂時,可得到消除多普勒增寬的精度Contrasting the results of simulation and the experiment for depositing the 3 inch thin films by icds technique, the center position of substrate and the target is in a 18mm offset, the thickness distribution homogeneity is under 8 %. based on the analyses of the theoretic heat distribution for the radiant heating system, a 3 inch size radiant heater fitting for the requirement is designed and made, whose temperature difference is under 6 %
其次,對3英寸范圍內的膜厚分佈進行了理論模擬,在此基礎上和試驗結果對比分析,發現:在倒筒靶直流濺射裝置下,如果採用一種讓基片中心和靶中心處于相對偏心距離為18mm的位置來制備3英寸薄膜,其膜厚分佈的均勻度范圍控制在8以內。Base on certain main magnets of nmr this thesis designs the most excellent structure of the pole shape and obtains a relatively uniform magnetic field in a large imaging volume. the calculating model of pole shape made of pure iron can be simplified with the infinite permeability and calculated with the scalar potential. the rule between pole shape and the homogeneity or the size of uniform region of magnetic field is discovered and factors of influencing the homogeneity of the magnetic field are held so that the main magnet with the optimized size of pole shape can produce a relatively uniform magnetic field in a large imaging volume
本文針對一類典型結構的主磁體,通過磁場分析與大量的計算,找到了極靴形狀的改變影響樣品區磁場均勻度以及均勻區域范圍的規律,掌握了極靴形狀的變化趨勢及其形狀影響樣品區磁場均勻度的各種因素,進行了極靴的形狀優化設計並編制了相應的計算機軟體,給出了極靴形狀的具體尺寸,使得主磁體能在更大空間內產生相對均勻的磁場。E. due to favorable condition of soil moisture, weak activity of wind and sand, and low inter - specific competition intensity resulting from repeated alternation between sand dunes and inter - dunes, the plant species richness and the plant species evenness are quite high in inter - dunes. f
由於丘間地水分條件較好,受風沙活動的影響較小,同時由於流動沙丘和丘間地的不斷更替降低了物種之間的競爭強度,就使丘間地具有較高的物種豐富度和物種均勻度。Abstract : it is shown in this paper that distributions of electric fields in five measuring slots of uster evenness tester, and the errors caused by uneven electric fields were analysed. according to the results of measuring and analysing electric fields, a set of tests were made, and several estimation to the errors were given. at last, notices of operation were given
文摘:實測了烏斯特紗線均勻度試驗儀上5個電容測量槽的電場強度分佈,分析了由測量槽不均勻電場所引入的誤差.系統地測試分析了第5號槽誤差,獲得了幾種誤差的定量估計.最後給出了正確使用儀器,避免測量誤差所應注意的幾點結論The result suggests that the species richness index ranks as following among 6 stations : yangma islet > drogan - whisker islet > moon bay > jingouzhai > jingouzhai gravel, and yangma islet possessed the highest species diversity index, while jingouzhai the lowest, the order of species diversity index among 6 stations is yangma islet > moon bay > drogan - whisker islet > jingouzhai > zhifu islet > jingouzhai gravel, the order of species evenness index is : moon bay > drogan - whisker islet > yangma islet > jingouzhai > zhifu islet > jingouzhai gravel
紅藻群落的物種豐富度依次為:養馬島芝罘島龍須島月亮灣金溝寨金溝寨礫石灘;物種多樣性指數以養馬島為最高,金溝寨礫石灘最低,依次為:養馬島月亮灣龍須島金溝寨芝罘島全溝寨礫石灘;物種分佈的均勻度指數依次為:月亮灣龍須島養馬島金溝寨芝罘島金溝寨礫石灘。The changes of spider community structure in transitional zone has important effect on the changes in cotton field
荒漠過渡帶蜘蛛群落的物種數、個體數量、多樣性、均勻度、穩定性都高於棉田蜘蛛群落的對應特徵。( 3 ) the result of imitating shows that the distribution of temperature look like triangle at present, the cause of temperature asymmetry is the mistake ratio of gas and air in the same vertical direction, the direction to improve on is by adjustment to distribute reasonably gas in different height and uniformly gas in same level
( 3 )模擬結果展現了目前鉛塔燃燒室溫度呈三角形分佈,並揭示了造成這種不均勻分佈的根本原因是空氣、煤氣在同一垂直方向的不匹配。並指出了改進方向是通過調整,使煤氣2002年工程碩士畢業論文摘要在高度方向的名迢群引配、以及在水平方向均勻分佈。Analysis on the species richness and diversity index, community evenness in different plots and layers of evergreen broad - leaved forest in shiyang forest center in wencheng, zhejiang province resulted that species richness and diversity index, community evenness of the second sublayer of tree layer was much greater than that of the first sublayer in the vertical structure of the community
對文成縣石?林場常綠闊葉林的不同樣地、不同層次的物種豐富度、物種多樣性指數和群落均勻度進行了分析,結果表明:在群落垂直結構中,喬木層第2亞層的物種豐富度、物種多樣性指數、群落均勻度顯著大於第1亞層。It is one of the best water - saving irrigation methods that can save water in the highest degree for such advantages as saving water, saving energy, increasing production, raising air temperature and ground temperature inside the shelf, lowering air humidity inside the shelf, decreasing plight and reducing the use of pesticide and chemical fertilizer, etc. but percolation irrigation is far from a ripe irrigation method for the problems existing in the development of pipes for pi and the two difficult problems which hamper the development of pi ( one is the low uniformity degree irrigation, the other is the blockage in percolation irrigation pipes )
它是迄今為止最節水的一種灌水方法,具有省水、節能、增產、提高棚室空氣溫度和地溫、降低棚室空氣濕度、減少病蟲害、少施農藥和化肥等優點。但滲灌還不是一種成熟的灌水方法,滲灌的發展,首先取決于滲灌管的研製;其次是阻礙滲灌發展的兩大難題:滲灌的灌水均勻度和滲灌管的堵塞兩大難題的解決與控制。Number of species and individuals, species diversity index and evenness, and proportion of wader birds decreased from bay - mouth to bay - head, and was lowest in midbay
其中灣口的水鳥物種數、個體數量、多樣性指數、均勻度指數以及涉禽所佔比例均為最高,灣底次之,灣中部最低。Biodiversity indices are much influenced by the types of the vegetation in jinfo mt. the species richness index, diversity index and evenness index of the plots in karst area raised when the plots were jamming early and slightly ; species richness index and diversity index of the plots in nonkarst area raised when the plots were jamming early and slightly, but evenness index fell. the diversity index and species richness index of original vegetation in karst area are lower than in nonkarst area
不同植被類型顯著影響其生物多樣性的變化,金佛山石灰巖地區植被在受到中輕度人為干擾初期,其物種豐富度和多樣性、均勻度指數均有提高;砂頁巖地區植被受到中輕度干擾,豐富度和多樣性指數有所提高,均勻度指數呈相反趨勢;石灰巖地區原生植被生物多樣性和物種豐富度指數較砂頁巖地區的原生植被低。For the first time red laser diode ( rld ) was used as light source to develop a laser beam grid sensor for monitoring seeding distribution. hence, monitoring covering problem is solved and monitoring precision percentage was improved
首次使用可見光激光二極體( rld )為光源製作了用於排種均勻度檢測的激光束柵格光電傳感器,解決了傳感器檢測覆蓋率問題,提高了檢測準確率。The species richness and diversity index of the tree layer and the shrub layer was obviously higher than that of the herb layer, and their evenness had evident difference
喬木層、灌木層的物種豐富度、物種多樣性指數均大於草本層,且差異極顯著,群落均勻度差異顯著。The results showed that : from north - facing slope to south - facing slope and plain field, the species evenness and diversity index decreased ; from plain field to north - facing slope and south - facing slope, richness index also decreased
結果表明,當生境由陰坡向灘地到向陽坡變化時,各種多樣性指數的變化順序為,物種豐富度:灘地陰坡陽坡;均勻度和多樣性指數:陰坡陽坡灘地。Species, the diversity index ( h " ) and evenness ( j ) of phytoplankton community increased gradually from inside of the bay to outside of the bay, and was greater in the outer bay than that in the inner bay. the density of total cell number increased from inside of the bay to outside of the bay, and was greater in outer and eastern bay than these in inner and western bay
調查海區浮游植物群落的種類數、多樣性指數與均勻度都表現為灣外多於灣內,灣內外側高於灣內內側的趨勢,而總細胞數的平面分佈呈現灣外高於灣內、灣內外側高於內側、東部高於西部的基本格局。It is very popular to be used for the welding of orbital tube, pipe, very small parts, short welding cycles and also where a specific number of welds are called and then the electrode is to be replaced. cerium tungsten electrode, tungsten cerium electrodes, w - ce electrode, ce - w electrodes, tungsten electrode, tungsten
鎢鈰並不適合於高電流條件下的應用,因為在這種條件下,氧化物會快速的移動到高熱區,即電極焊接處的頂端,這樣對氧化物的均勻度造成破壞,因而由於氧化物的均勻分佈所帶來的上述好處將不復存在Qualitative and quantitative investigation ( visual encounter surveys ) of terrestrial mollusca were carried out in each sampling site of mangshan nature reserve and babaoshan of guangdong. all terrestrial mollusca in each sampling site were collected and identified. a list of the name of the species of terrestrial mollusca, margalef species richness index ( d _ ( ma ) ), shannon - wiener index ( h " ) and pielou evenness index ( jsw ) were used to analyze their biodiversity
對各個採集點的陸生貝類不但進行了定性調查,而且進行了定量調查( ves法) ,對調查採集到的陸生貝類物種進行編目,並採用margalef豐富度指數( d _ ( ma ) ) 、 shannon - wiener多樣性指數( h 』 ) 、 pielou的均勻度指數( jsw )對陸生貝類多樣性進行了分析。By the long period of study, the uniformity can be increased to 80 % or more, the result can meet the general requirement for the spray irrigation
通過這兩種方法最終可使噴灌的均勻度達80以上有不錯的效果。The result showed that there were close negative relationships between biodiversity indices and soil total capacity of calcium & magnesium. there were ne
土壤鈣鎂總量與物種的均勻度分佈有密切關系,隨著鈣鎂的增加,物種分佈的均勻程度減小。分享友人