f-structure 中文意思是什麼

f-structure 解釋
功能結構
  • f : 1 【化學】 fluorine 2 【生物學】 （generation of） filial offspring; 【植物；植物學】子代 〈F1 雜...
  • structure : n. 1. 構造，結構；組織；石理，石紋。2. 建造物。3. 【化學】化學結構。4. 【心理學】（直接經驗中顯現的）結構性，整體性；整體結構。adj. -d ,-less adj.
  1. Third, this dissertation analyzes the complicacy of result size estimation problem for xml structure based query optimization compared to its counterpart in traditionally relational database, and proposes a full - featured result size estimation algorithm for xml query, sxm. for simple path expression query, this dissertation proposes a dynamic synopsis model for xml data based on the concept of f - stable and b - stable, xmap. for complicated path expression query, this dissertation adopts an improved bifocal sampling method for result size estimation

    第三，分析了xml結構化查詢優化中的查詢代價估計問題與傳統關系型數據庫中的查詢代價估計問題的區別，提出了一套完整的xml結構化查詢代價估計體系sxm ，包括對簡單路徑表達進行查詢代價估計的動態xml數據統計模型xmap ，對復雜路徑表達進行查詢代價估計的雙焦點例舉法，以及對值匹配條件進行查詢代價估計的基於小波的多維直方圖方法，並能將多種查詢表達的查詢代價估計結果結合在一起，以給出一個完整的xpath查詢的代價估計。
  2. The ultrastructure of the hepatocyte in bufo bufo gargarizans cantor between pro - hibernation and initial post - hi be rnation was studied in this paper. the results show that : 1. the hepatocytes in pro - hibernation period have very plenty of glycogen granules, but nearly not glycog en granules in post - hibernation period ; 2. the hepatocytes in pro - hibernation peri od have very developed rough endoplasmic reticulum, but a few scattered dilatant rough endoplasmic reticula in post - hibernation period ; 3. the quantity of mitocho ndria, and the structure of nuclei and bile canaliculi in pro - hibernation period have not obvious difference from that in post - hibernation period ; 4. two types o f hepatocytes in pro - hibernation were found. the significance of the results men tioned above is also discussed

    冬眠前和出眠初期的中華大蟾蜍肝細胞的超微結構有如下特點： （ 1 ）冬眠前肝細胞堆積有大量糖元顆粒，而出眠初期幾乎無糖元顆粒； （ 2 ）冬眠前肝細胞的粗面內質網非常發達，而出眠初期的粗面內質網不發達，常呈零散膨大； （ 3 ）線粒體的數量，細胞核和膽小管的形態結構在這兩個時期無明顯差異； （ 4 ）冬眠前肝細胞可分為兩種不同的類型.對上述結果的生理意義作了討論
  3. Ha possesses well biocompatibility, which has been discovered through test and in clinical application. however, the relatively large dissolution or resorption rates of ha will result in the failure of the implants. fluoridated hydroxyapatite ( hfa ) in whose structure f " occupies partially the position of oh " in ha, is expected to be more resistant to body fluid and less soluble than ha and still possess almost the same bioactivity as ha

    生物活性羥基磷灰石薄膜（ ca _ （ 10 ） （ po _ 4 ） _ 6 （ oh ） _ 2 ， ha ）廣泛地應用於鈦合金硬組織種植體表面改性，臨床應用發現ha薄膜具有很好的生物相容性，但是ha薄膜在體內溶解速度有時可能會過快，引起種植體在體內失效，因此， ha薄膜長效性方面有待于提高。
  4. The slope stability question is influenced by many kinds of inherent factors, for instance geological structure, intensity of rock body, development state of joint and crack, cohesive force ( c ) of the rock, interior angle of friction ( f ), groundwater, etc., these objective factors reflect generally their sizes with some quantitative parameter indexes in the past

    邊坡穩定問題受多種內在因素影響，如地質構造、巖體強度、節理裂隙發育狀況、巖石的內聚力（ c ） 、內摩擦角（ ） 、地下水等，這些客觀因素過去一般用某些定量參數指標來反映其大小。
  5. Based on the analysis of the 3 - aixs f / t sensor, the force isotropy indices of the 5 - axis sensor with 4 - sps & 1 - upu structure are studied

    在分析了三維力傳感器的基礎上，研究了4 - sps & 1 - upu五維力傳感器的各向同性性能。
  6. The aim of this work is to have a better understanding of the structure, differentiation and phylogenetic relationship of the tribe hyoscyameae in the solanaceae using evidence from leaf epidermis, seed morphology, palynology, embryology, floral organogenesis, trnl - f and its sequences, and plant geography. the results are summarized as follows : 1. leaf epidermis leaf epidermis of 21 species in seven genera of the tribe hyoscyameae and four species in four related genera was investigated under both light microscope ( lm ) and scanning electron microscope ( sem )

    解剖學在光學顯微鏡和掃描電鏡下，觀察了茄科天仙子族（ hyoscyameae ） 7屬21種及鄰近4屬4種共25種植物的葉表皮特徵，結果表明：氣孔器在各種植物的上、下的表皮均有分佈，多為無規則型，也有不等細胞型；葉表皮細胞形狀有不規則形、十字形、近長圓形和不規則多邊形，垂周壁較平直或各種波狀。
  7. All data indicated that f i was a pure substance. third, using modern analytic techniques such as nucleic magnetic resonance ( nmr ), infrared spectroscopy ( ir ), ultraviolet visible absorption spectra ( uv ) and mass spectrometry ( ms ), we analyzed the basic chemical structure of f i and nominated it phthalic acid di ( 3 - methyl ) nanyl ester ( pdne ). we estimated primarily it was a novel natural compound

    第三，利用核磁共振，紅外光譜，紫外分析，質譜等現代分析測試技術對分離提取物f進行結構鑒定，解析出f的結構，初步推斷該物質為鄰苯二甲酸- （ 3 -甲基）壬酯（ pdne ） ，根據目前所掌握的資料，還沒有檢索到該物質相關的報道，初步認定為一種新型的天然產物。
  8. A complex cytoskeleton of f - actin filaments and microtubules is often present, and appears to control the structure of the cytoplasm, cell movements, and movements of the cytoplasm and conformation of the membranes

    微絲和微管構成的復雜的細胞骨架存在於細胞質中，細胞骨架維持著細胞質的結構，細胞運動，胞質流動以及細胞膜的構象。
  9. This article analyses the structure o ' f the introduction of aira to deal with its operating principle and the design for the major components

    本文通過對間隙感知型自動調整臂的結構分析，較詳細地討論了間隙調整臂的工作原理和主要零件的設計方法。
  10. F has a fine structure, i. e. detail on arbitrarily small scales

    分形集合具有精細結構，也就是說，在任意小的尺度下，它總有復雜的細節。
  11. By starting with the analysis of generator end structure and overheat sources, it is presented that the technical key required to expand the capacity of the unit is to solve the electromagnetic leakage shielding problem. by proceeding with the analysis of the reasons causing the aging of the stator winding bars insulation, the necessity for stator winding bars to adopt class f insulation and relative fixing technological improvement are pointed out so as to extend the service life of the winding bars insulation

    從分析發電機端部結構及過熱原因入手，提出了增容的技術要點在於解決端部漏磁屏蔽問題；從發電機線棒絕緣老化原因分析入手，指出為延長定子線棒絕緣使用壽命，線棒主絕緣採用f級的必要性以及相關工藝的改進。
  12. Both earlier f. bobbitt ' s activity analysis and w. w. charters " job analysis, or later the famous tyler ' s rationale, they all did their best to pursue efficiency, objectivity, forecast and control. from the mid - 20th century on, the structure - functionism research of curriculum was strongly influenced by the political and ideological analysis of curriculum

    ，他回答這一問題的技術理性和科學主義模式對整個20世紀的課程研究產生了深遠的影響，無論是從早期博比特的活動分析法、查特斯的工作分析法，還是到后來著名的泰勒原理，都努力追求效率與客觀化，追求預測與控制。
  13. The extracellular 100pl ( ecl1 ) and ecl2 was linked by disulfide bond to maintenanced the stability of the protein secondary structure. in recent years, we showed that ccr5 as a co - receptor could interact with hiv - 1 infect ion. ccr5 was paid closed attention to since it was cloned in 1996. the aim is to - obtain the sequence of first extracillular domain of 3 chemokine receptor 5 ( ccr5 ) n - terminal gene fragment with high level expression in e. coli and to prepare its specific antibody f ( ab ' ) ;, and its detected method

    Ccr5具有g蛋白偶聯受體家族（ g - proteincoupledreceptors ， gpcrs ）所特有的7個跨膜區（ transmembrinedomains ， tm ） ，呈螺旋， tm的氨基酸有很高的保守性，膜外第一襻（ extracellularloop1 ， ecl1 ）和ecl2之間有二硫鍵相連，以維持蛋白質二級結構的穩定性。
  14. During the high - voltage device design, the thick epitaxial layer ldmos which is compatible with current technology was researched. this device used piecewise vld and multiple region structure f reduce field layer. the using of the f reduce field layer effectively reduce the surface electric field of the device, shorten the length of its drift region, enlarge the choice of range of the ion implant dose of the p layer, and effectively restrain the disadvantageously affection on the breakdown voltage of the interface charge qss

    在高壓器件研究中對與現有工藝相兼容厚外延ldmos進行研究，該結構採用分段變摻雜多區p ~ -降場層，有效降低器件的表面電場，縮短器件的漂移區長度，增大p ~ -降場層注入劑量的選擇范圍，並有效地抑制界面電荷qss對器件耐壓的不利影響。
  15. It, according to the basic theory and effectiveness of teaching and studying, firstly analyses two kinds of the teaching structure and the teaching structure as " studying and teaching is of equal importance ". it secondly puts forward the seven key contents that the teaching structure of modern distance education should embody. then, according to charles f. hoban ' s av communicational model, it has designed the teaching structural model of modern distance education, i. e. it establishes the structural model on the basis of the systematic and controlling view, under the guidance of the constructivism and modern educational technology, and taking the teaching process as the designing line and the completion of the students " intellectual building as the final goal

    本文首先對現行的兩類教學結構以及「學教並重」的教學結構，在基礎理論和教與學效果兩方面進行了刨析;其次，提出了現代遠程教育教學結構應體現的七項主要內容;再次，以霍本視聽教學傳播模型為基礎，設計出了現代遠程教育教學結構模型:在系統論和控制論的基礎上，以建構主義和現代教育技術學為指導，以教學過程為設計主線，以完成學生知識意義建構為最終目的來建構結構模型;最後，把市場觀念引入現代遠程教育過程中。
  16. First we give the conception of multimedia - instance model, which consist of 7 - tuple mi ( s, f, a, a, fi, sv, fj ' 9, where s is a set of states, which captures a certain structure to store information. f is a set of features, which presents pieces of information of given states, a is a map from sto 2 ". a " is a set of feature - state relations on 2f xs, which reflects the relation between characteristics of state, fi is a set of relations defined on s. which reflects the relation between states

    我們首先定義媒體實例的概念，該媒體實例為7元組mi =口，幾且， o ，盡sv ， 919其中， s是一個狀態集，一個狀態捕獲一個確定的用於存儲信息的結構； f是一個特徵集，一個特徵反映給定狀態中一則有意義的信息；允： s 2 ?是一個從狀態到特徵冪集的映射，反映一個給定狀態中所具有的特徵； "是一個在2 ? s上的關系集，它反映狀態中特徵之間的關系；膽是一個在s上的關系集，反映狀態之間的關系； sv是一個狀態變量集； fv是一個特徵變量集。
  17. Schultz, d. m., d. keyser, and l. f. bosart, 1998 : the effect of large - scale flow on low - level frontal structure and evolution in midlatitude cyclones. mon. wea. rev., 126, 1767 - 1791

    通過觀測和模擬研究發現，大尺度氣流對中緯度低層鋒面的結構和演變有重要影響。該文採用觀測和理想化模擬相結合的方式，探討了大尺度氣流的這一作用。
  18. Cot1s i deri ng that t he exte ] - ioi - in t el - ference mai n1 y comes from t 11e sea fl o v l11elj i t i s un ( lel ' - i1 t el ", thi s nfr ) j { j1t i ; fi + lk, 7 : f } itft, ? } { t ! : i / cx pal7er veri fj ed t he st i ~ ol1g 1 ~ oi ) ust ness of th is fuxzy va1 - iilb1 e st l ' uctul ' c control method against the mode1 uncertainties and external disturhances, such as the variat ions of the sea current i s sdeed and direct ion, ancl it a1 so coinpared it se1f wi t. h the l > ji ) contl ~ o1 ler in comnlon use and the regu1ar variable structure contro11 er

    論文分別討論了潛器縱向，橫向和航向三個子系統在不同條件下的控制問題，考慮到該潛器潛航時外界干擾主要來自海流，驗證了模糊變結構控制方法對模型參數時變及海流速度、方向變化的強魯棒性，同時將該控制器跟實際工程中常用的pid控制器和常規的變結構控制器的控制效果進行比較，並結合實際情況，將該控制器同縱傾調節相結合進行控制以更好地滿足實際工程的需要。
  19. Part two the study of lattice - valued tense propositional logic system and its resolution method the main work of this part is to introduce four tense operators e ( ever ), f ( will ), h ( ever always ) and g ( will always ) into lp ( x ), put up lattice - valued tense propositional logic system ltp ( x ) which takes time axis as language circumstance, gave detailed semantic interpretation and syntax structure, and discussed some properties of it, then proved soundness theorem and consistence theorem. furthermore, studied ( a, t ) - resolution principle which is related to time, gave some rules of computing tense resolvent, and put forward the method of tense resolution

    第二部分：關于格值時態命題邏輯系統及其歸結方法的研究此部分的主要工作是在格值命題邏輯系統lp （ x ）中引進時態運算元e （曾經） 、 f （將會）及其對偶運算元h （曾經總是） 、 g （將會總是） ，提出了以時軸為語境的格值時態命題邏輯系統ltp （ x ） ，並給出其具體的語義解釋和語法結構，並討論了它的一些性質，證明了該系統的可靠性和協調性。
  20. To efficiently reconstruct the topological structure of a large number of stl ( stereolithography ) data, the integrating vertex algorithm of the avl tree based on the v - f structure is promoted to delete a large number of repeated vertexes and reduce the size of data file

    （ 2 ）提出了基於v - f （點-面）存儲結構的avl頂點聚合演算法和基於虛avl的鄰邊搜索優化演算法。
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