本底密度 的英文怎麼說
中文拼音 [běndemìdù]
本底密度
英文
background density-
Tide is the primary dynamic factor in building tidal flat ; it must be affect tidal creek system on mud flat. therefore, based on the raster image of the year of 2000, the thesis has built correlation equations between average tidal ranges and the density of tidal creeks, the ratio of the width of outlet to the length of low tidal shore, the ratio of the area of tidal creek to tidal basin respectively. the result shows that the former is high well - marked correlation ; the two latter are well - marked correlation
潮汐是塑造潮灘的主要動力因素，它必然與淤泥質潮灘上潮溝系統的發育有密切的關系，為此，本文以2000年的衛片作底圖，對潮溝系的密度、溝口寬度占低潮線長度的比值以及潮溝面積與潮盆面積的比值，分別與平均潮差建立了相關關系，結果發現，潮溝系的密度與平均潮差之間存在著高度顯著的相關性，溝口寬度占低潮線長度的比值和潮溝面積與潮盆面積的比值與平均潮差之間存在著顯著的相關性。Based upon the analysis of the data obtained during the survey, it can be concluded that : 1 ) the number of biomass of macrobenthos in the yellow sea and the east china sea in autuma is higher than that in spring, while the number of density of macrobenthos in autumn is lower than that in spring ; 2 ) the number of biomass of macrobenthos in the yellow sea is higher than that in the east china sea ; 3 ) the number of species in the yellow sea is lower than that in the east china sea ; 4 ) one of the characteristics of distribution of macrobenthos in the east china sea is that the species richness increased from the coastal waters to the offshore deep waters, from the north to the south. 5 ) the species composition in the deeper part occupied by the cold water mass of the yellow sea is more stable than that in the coastal part of the yellow sea in the late 40 ~ 50 years
通過以上幾方面的分析，結果表明： 1 ）黃東海調查海域的秋季總生物量均高於春季，總棲息密度則低於早春季； 2 ）黃東海春季生物多樣性指數高於秋季； 3 ）南黃海、東海的水文特點顯著不同：東海底溫顯著高於南黃海底溫，東海底鹽亦高於南黃海底鹽； 4 ）南黃海春秋季生物量分佈無一致規律，東海春秋季生物量除長江口外基本上自近岸向外海逐步降低； 5 ）東海大陸架大型底棲動物的種類組成較南黃海更豐富； 6 ）東海大型底棲動物的分佈特點之一為：種類數由北向南、由近岸（西部）向外海（東部）逐漸增多； 7 ）在黃海冷水團控制的海域，其底棲動物種類組成較近岸海域穩定； 8 ）幾個生物多樣性指數各有側重，都能較好地反映底棲動物的分佈特點Furthermore, the growth and the study of self - organized quantum dots structures become more and more important recently, and the application of self - organization technique become wider and wider in this thesis, we address the theory of film growth and the growth technique firstly more, the ways and characteristics of surface detection are prescribed we mainly report the growth process, results and discuss of self - organized quantum dots structures in the a12o3 substrates by s - k mode using ecr - mocvd, in the espd - u device the growth art of ain epilayer which is the preliminary foundation of self - organized gan / ain quantum dots structures, including the substrate cleaning, nitridation, the growth of buffer and the growth of gan and ain epilayer, is discussed we deliberately compare the test result of rheed xrd and afm and achieved the optimalized condition of ain at last we have successfully realized the growth of ain which is much smooth and better crystal quality moreover, we grow the self - organized gan / ain quantum dots structure in s - k mode because the limits of the heater temperature, we can not grow the atom - smooth epilayer of ain until now so we could not grow better quantum dots which have small diameter and big density but the self - organized quantum dots structures with better quality will be realized successfully if the substrate temperature is increased the thesis study belong to my tutor subject of national nature science foundation ( 69976008 )
本論文主要論述了在espd - u裝置上，採用電子迴旋共振等離子體增強mocvd （ ecr - pamocvd ）方法，在藍寶石襯底上通過s - k模式自組裝生長gan aln量子點結構的生長工藝、結果及討論。而重點分析了自組裝生長量子點之前的aln外延層生長工藝，包括襯底清洗、氮化、緩沖層的生長和gan 、 aln外延層的生長；通過高能電子衍射、 x射線衍射和原子力顯微鏡測試，並且對這些測試結果進行了詳細的比較研究，得出了較優化的工藝條件，生長出了晶質較好、表面較平整的aln外延層；進而採用s - k模式自組裝生長了gan aln量子點結構。由於實驗裝置加熱爐溫度的限制，我們沒有能夠生長出原子級平滑的aln外延層表面，因而沒能夠生長出密度比較大和直徑比較小的量子點。This dessertation systematically researched dislocation and ab microdefects etched by molten koh and by ab etching respectively in gaas substrate, which were provided by merchants from home and overseas, as well as their influence on electrical parameters
本文系統地研究了國內外各生產廠家提供的gaas襯底中用熔融koh腐蝕的位錯、 ab腐蝕液腐蝕出的ab微缺陷的密度和分佈情況以及它們對襯底電參數（電阻率、遷移率、載流子濃度）的影響。This machine is a large - sized machine which is specialized for application of building material, furniture, door and windows, door pocket, furniture of decoration industry, indoor decorative material as well as picture frame, billiard table, sound box and other veneer decoration, through adjustment, this machine can make complex flower pattem surface achieve terribly perfect effect furthermore, for pvc, paint paper, coiled wood peel, various kinds of compex solid - wood, density board, plastics, steel product, aluminium section as well as many other material, theirsurface, side face, base and undersi de can be attached with veneer at one time with adoption of our machine
本機器是專為滿足建材、傢具裝飾行業的門窗、門套、傢具、室內裝飾材料以及鏡框、臺球桌、音箱等貼面裝飾使用的大型機器，通過調整可使復雜花形表面達到十分完美的效果， pvc 、油漆紙、成卷木皮與各種復雜實木、密度板、塑料、鋼材、鋁型材等材料的表面、側面、底邊、底面一次可完成貼面。The basic idea for hierarchy - based method is that creating and maintaining a tree of clusters and sub - clusters according to some kind of criterion to measure the distance of clusters, the procedure will be sloped until some terminal conditions are satisfied. hierarchical clustering method can be further classified into agglomerative and divisive hierarchical clustering, depending on whether the hierarchical decomposition is formed in a bottom - up or top - down fashion. most hierarchical clustering methods can produce the better results when the clusters are compact or spherical in shape. but they do not perform well if the clusters are any shape or there are outliers. a main reason is that the most hierarchical clustering methods employ medoid - based measurement as distance between clusters
基於層次方法的聚類的基本思想足：根據給定的簇間距離度量準則，構造利維護一棵由簇利子簇形成的聚類樹，直至滿足某個終結條件為止。根據層次分解是自底向上還是自頂向下形成，層次聚類方法可以分為凝聚的（ agglomerative ）和分裂的（ divisive ） 。人多數層次聚類演算法在緊密簇或球形簇結構下能夠產生較好的聚類效果。Several influence factors to result plasma drift in hainan were analyzed. in this paper the characteristics of ionospheric parameters variation were analyzed systematically and some new results in storm - time such as seasonal behaviors were obtained ; it is the first time to investigate the ionospheric drift behavior in hainan and some new results was obtained, the relationships between each two plasma drift velocity components in storm time in hainan were found and the electric filed variation in hainan ionosphere also was obtained ; the results also show that there are big differences of the ionosphere parameters bo and bl obtained from the data with that obtained from the iri - 2001 applied for hainan ; a new phenomena was found during a strong magnetic storm, that a layer with very strong electron density and density grad was found during the recovery phase of the storm, its horizontal scale is beyond 100km and temporal scale is about 2 hours, this phenomena repeated 3 times continuously. a type of negative disturbance in high and low latitude but positive disturbance in east - asia also has been found
本文較為系統地給出了海南地區電離層的參數變化特徵，特別是得到了一些暴時與以往不同的季節特性；第一次給出了海南地區的電離層等離子體漂移特徵，發現等離子體漂移暴時擾動在三個方向上有內在的聯系，得到了電場變化曲線；研究結果還表明海南電離層的半厚指數和形狀參數等與國際參考電離層iri - 2001存在很大差別；通過對強磁擾動事件期間的參數變化特性分析發現，在磁暴恢復相期間海南地區電離層底部存在一個電子密度非常大的高密度區，高密度區底部電子密度梯度隨高度急劇增加，該區域的水平尺度可達100公里以上時間尺度約為2小時，連續出現過三次，這是一個在海南從來未發現的新現象；研究還發現了暴時東亞地區電離層擾動會出現高低緯負相而中緯正相的現象。The author excogitated a kind of appropriative mud jacking material which is made up of cement, sand, fly ash, admixture and water. this material which was developed on the basis of large amount of tests has the proprieties of good self - flowing density, high earlier strength, non - segregation, non - weepage and non - contractility. especially, the author aim at dealing with pumping mud and earlier maintained developed a kind of high flow grade material which can meet the requirement of mud jacking
本文研製了專用壓漿材料，採用水泥、砂、粉煤灰、外加劑和水混拌而成，通過大量實驗配製出的漿液具有自流淌密實性好、早期強度高、無離析、無泌水、無收縮的性能，特別是針對路面唧泥處理或預防性養護，板底脫空量較小，研製出高流動度材料，能滿足壓漿施工的需要。Cubic nitride boron ( c - bn ) films have been prepared at room temperature ( 25 ) by radio frequency plasma enhanced pulsed laser deposition ( rf - pepld ), assisted with substrate negative bias. in this paper, we primarily studied the effect of laser energy density, radio frequency power, substrate bias and depositing time on the growth of c - bn films, and analyzed the formation process and mechanism of c - bn films deposited by rf - pepld method at room temperature
本文採用偏壓輔助射頻等離子體增強脈沖激光沉積（ rf - pepld ）方法在常溫下（ 25 ）制備立方氮化硼（ c - bn ）薄膜，初步研究了薄膜沉積參數：激光能量密度、射頻功率、基底負偏壓和鍍膜時間對立方氮化硼薄膜生長的影響，並分析了常溫下用rf - pepld方法沉積立方氮化硼薄膜的形成過程和機理。The research and application of the diamond films were reviewed in this paper, and the nucleations on different substrates in hfcvd ( i lot filament chemical vapor deposition ) system were introduced. the improvement of the diamond nucleation on si, ni, cu was investigated, in order to deposit diamond of high density. the p - n junction between b - implanted diamond films and n - type si substrate was investigated
本論文簡要敘述了金剛石薄膜的研製進展和應用，介紹了用化學氣相沉積法（ hotfilamentchemicalvapordeposition ）在不同的襯底上的金剛石薄膜的制備方法和形核，並對si 、 ni 、 cu三種不同的襯底的金剛石膜研究了如何增大形核密度、提高形核質量。In this article, we study the implemetation of fpga for elliptic curve digital signature algorithm. based on number thesis 、 abstract algebra and complex thesis ， integrated information theory 、 cryptography and some specific relevant algorithm ， we ascertain the implementation of ecdsa for hardware project ： according to the design idea of hiberarchy and modularization, we adopt very high speed ic hardware description language ( vhdl ) as design input and simulate the design in every level and every model for the correct of the fundamental design. after finish the top design, we perform the whole simulation. then ， we carry out the timing simulation after the logic synthes and layout
本文從實際應用出發，研究了橢圓曲線數字簽名演算法的fpga的實現：以基本的數論理論、抽象代數和復雜度理論為依據，結合信息論、密碼學的一些知識以及一些具體的相關演算法，確定了ecdsa的硬體實現方案：按照層次化、模塊化的設計思想，採用硬體描述語言vhdl作為設計輸入進行ecdsa的硬體設計；在每個設計層次和每個模塊都進行了模擬驗證，得以保證底層設計的正確性。在確保每個模塊的設計正確后，完成對電路的頂層設計，進行總體的模擬。In view of the commonly - used block cipher and public key cryptography, this article focuses on the improvement we have made for the algorithms about aes, dbs, ecc and rsa. based on the dsp chip tms320c6201 from ti company, we have accomplished the speed of 0. 92 usec per aes encryption / decryption, 1. 335 usec per dbs encryption / decryption, and 3
針對目前信息安全體系中常用的分組密碼和公鑰密碼演算法，本文著重改進了des 、 aes的快速演算法實現，並在基於ti公司dsp晶元tms320c6201的系統中實現了0 . 92usec加（解）密一個aes分組， 1 . 335usec加（解）密一個des分組， 3 . 585usec加（解）密一個tdea分組；同時通過改造，使montgomery約化更易於進行并行處理，並通過改進橢圓曲線密碼（ ecc ）底層運算和倍點演算法，使得rsa和橢圓曲線密碼的實現速度得到了極大的提高。With the development of high power microwave tube, the theoretical and experiment investigation of the high performance cathode have been conducted. the research work includes how to prepare the high performance cathode and the effect of the based metal on the cathode emission, the measurement of the inner and surface fine structures of the cathode, the discussion of emission mechanism of thermionic cathode. after a lot of experiment, we finally determined the cathode preparation with an excellent emission
為了適應大功率微波管的發展，本文展開了對高性能（大電流密度、長壽命）陰極的研究，研究工作包括陰極制備工藝、鋇鎢陰極基金屬對陰極發射性能影響、以及鋇鎢陰極基底內部結構無損檢測及表面形貌檢測、鋇鎢陰極發射機理探討及應用四個方面的實驗和理論的研究。At present, the main form is lower frame - shear wall structure with upper masonry structure ( lfswsums ), however, due to masonry structure ' s high self - weight and low aseismic capacity, the total height of the building and the number of storeys are strictly limited
目前，應用的主要結構形式是底部框剪砌體結構，但由於其自重大，抗震性能差，房屋的層數及高度受到嚴格限制。本文探索將密肋復合墻結構應用於底部大開間多層及中高層建築以及取代底部框剪砌體結構的可行性。Electronic commerce, as a result of high speed development in communications, network and information technology, combines the enterprise, supplier and customer of traditionary commerce firmly with its powerful data information and efficient corresponding network, which can press manufacture close to consumption, and can reduce transactiona ! cost of material flow, fund flow and information flow. so we say electronic commerce is a thoroughly commerce innovatory mode, it is a direction of trade in the future
電子商務作為通信、網路和it技術高速度發展的結晶，它應用強大的數據信息和高效的通信網路把傳統商務的企業、供應商和客戶緊密聯系在一起，使生產和消費更為貼近，減低了物流、資金流以及信息流傳輸處理成本，是對傳統貿易方式的一次徹底變革，也是未來貿易發展的必要方向。分享友人