diversity technique 中文意思是什麼

diversity technique 解釋
分集技術
  • diversity : n. 1. 不同，異樣，差異。2. 繁多，多種，多樣，駁雜，參差。
  • technique : n. 1. （專門）技術；（藝術上的）技巧，技能。2. 手法〈如畫法，演奏法等〉。3. 方法。
  1. They are jinfo mountain in nanchuan county ( natural protection section ), wuling mountain in qianjiang county ( national emphases forest demonstration county which forest cover rate is beyond 50 % ) and zhongliang mountain in beibei county ( artificial destruction is very grave ). some main land use patterns i. e. woodland, garden, infield, abandon infield, shrub and grassplot are selected in those three sample sites. four aspects on soil fertility index of karst environment under different land use patterns in these three sample sites, are revealed in this paper, by using the field test, indoor measure and analysis, outdoor experiment and field investigation, and the knowledge and technique of soil, ecology, physics and chemistry etc. they are physical characteristic ( effective soil thickness, organic layer thickness, soil texture, water - stable aggregate and soil water etc. ), chemical fertility ( organism, omni - n, omni - p, omni - k, alkali - nitrogen, available p, available k and rapid available k etc. ), soil animalcule ( bacteria, fungi, actinomyces and their grosses ) and soil - seed - pool ( plant community diversity index ) in karst ecosystem

    本研究以重慶市的南川金佛山（自然保護區） 、黔江武陵山（國家重點退耕還林示範縣，森林覆蓋率50以上）和北碚中梁山（遭人為破壞嚴重）典型巖溶區為對象，選擇了幾種重要的利用方式，包括林地、果園、耕地、棄耕地和灌草坡，採用野外巖溶生態調查和室內試驗測量分析相結合的方法，以不同土地利用方式巖溶土壤肥力為重點，對不同土地利用方式土壤肥力特徵進行量化分析，找出巖溶土壤肥力差異的主要方面及其根本原因，論文主要從土壤剖面物理退化指標（有效土層厚度、有機質層厚度、質地、團聚體、水分含量等） ，化學肥力退化指標（有機質、全n 、全p 、全k 、堿解n 、速效p和速效k等） ，樣地土壤微生物指標（細菌、真菌、放線菌數量及總量）以及樣地土壤種子庫植物群落多樣性等4個方面對重慶典型巖溶區的土壤肥力特徵進行了較為詳細的分析研究，為巖溶地區士壤資源的合理利用及結構的調控管理提供依據。
  2. Cluster analysis by upgma methods indicated that these five stocks might be divided into three clusters. results of rapd a nalysis suggested that extensive genetic diversity was detected in this species and the genetic divergence among stocks was relatively high ; upgma phylogenetic tree showed there existed three geographic populations of p. polyactis in the yellow sea and the east china sea, which supported the previous conclusion by morphological and ecological methods. part two : the genetic diversity between trichiurus lepturus and eupleurogrammus muticus random amplified polymorphic dna ( rapd ) technique was applied to 12 individuals from each species of the hairtail fishes trichiurus lepturus and eupleurogrammus muticus collected from the yellow sea

    50一2 . 44 ） ，群體內和群體間的遺傳變異比例分別為69 %和31 % ;群體間的平均遺傳相似度和遺傳距離分別為0 . 9139和o . q861 ;用非加權配對算數平均法（ unweightedpair - groupmethodofari山m七tiome即s ， upgma ）聚類分析的結果表明，所分析的5個群體可被分為3個地理群系，從分子水平上支持了過去有關學者把黃海和東海的小黃魚劃分為北中南3個地理群系的觀點。
  3. As analyzed, ( 1 ) the rapd technique is highly sensitive to investigating genetic diversity in t. lepturus and e. muticus. t. lepturus exhibits lower polymorphism and genetic diversity than e. muticus ; ( 2 ) according to the analysis of the partial mitochondrial 16s rrna gene sequences, a very low intraspecific variation and considerably high divergence among species were found, which reveals a dual nature of conservatism and variability in mitochondrial 16s rrna gene ; ( 3 ) five primers generate the species - speeific rapd sites and these sites can be served as the molecular markers for species identification and ( 4 ) it can be proved at dna variation level that t. lepturus and e. muticus are of two species respectively pertainiag to different genera, which supported the nelson taxonomic conclusion

    分析結果表明: （ 1 ） rapd技術研究黃海帶魚和小帶魚的遺傳多樣性具有較高的靈敏度和檢出率，帶魚的多態比例和遺傳多態度均較小帶魚的低; （ 2 ）線粒體165出兇a基因序列在分析兩物種遺傳變異時表現出保守和變異的雙重特性，種內變異極小而種間較大: （ 3 ） 5個隨機引物擴增出種特異的ra衛d帶，可作為種間分子鑒定標記; （ 4 ）研究證實帶魚和小帶魚是不同屬的兩個種，從而在分子水平上支持了nelson分類系統的觀點。
  4. In this work, some species of palmae cultivated in the xiamen botanical garden had been selected to be analyzed their genetic diversity with rapd ( random amplified polymorphic dna ) technique. according to the result of genomic dna amplified with pcr ( polymerase chain reaction ), genetic distance and similarity between different palm species were calculated on nei " s estimate of similarity and genetic distance. a primary but first time research at the phylogenetic relationships of some genera and species, the molecular classification and identification of some puzzling species of palmae was carried out through upgma ( unweighted pair group mean average ) cluster analysis of the genetic distance together with comparative study of the morphological structure characteristics

    本文在初步調查分析了棕櫚科植物在我國的自然分佈、引種馴化情況以及該類植物在廈門地區栽培應用狀況的基礎上，首次採用rapd分子標記技術，對廈門萬石植物園引種的一些棕櫚科植物的遺傳多樣性進行了研究，根據pcr對基因組dna擴增的結果，用nei ' s相似性系數計算了不同植物間的遺傳距離和遺傳一致度，通過對遺傳距離的upgma聚類分析，並結合形態分類的特點，對棕櫚科植物的屬、種間的系統分類關系和一些疑難種的分類鑒定進行了初步研究。
  5. Genetic diversity analyses of three wild populations of pinctada martensii dunker. using rapd technique

    月季切花衰老相關基因的差異顯示及其序列分析
  6. In this paper, it were briefly introduced principle and structure. the application of microsatellite technique was reviewed in the study of animal, for instance, construction of genetic linkage map, molecular marker assisted breeding, evaluation of genetic diversity, genetic monitoring and so on were summarized

    本文簡述了微衛星技術基本原理、優點和檢測方法以及在實驗動物科技等領域中的應用，例如遺傳連鎖圖譜、分子標記輔助育種、遺傳多樣性分析、遺傳質量檢測等。
  7. The key technique of telemetry digital diversity receiver is diversity technique, which combines independent multi - path signal or extremely irrelevant multi - path signal at less, and improves instant snr and average snr in receiver and enhances communication quality. there are many irrelevant multi - path signal in wireless

    遙測數字分集接收機一個重要關鍵是分集技術，分集技術是對獨立的或至少是高度不相關的多徑信號進行相加，從而改善接收端信號的瞬時信噪比和平均信噪比，提高通信質量。
  8. Diversity receiving technique for synchronous time spreading signal in time - varying fading channels

    時變衰落通道中同步時間擴展信號的分集接收技術
  9. Frequency diversity technique is effective in suppressing age if the frequency interval is big enough to remove off the correlation between the pulses transmitted by radar, wide - band mmw radar can satisfy the requirement but conventional microwave radar can t

    頻率分集技術抑制目標角閃爍的有效性，取決于去除脈間相關性的性能，即要求雷達發射信號必須有較大的頻率間隔，寬帶毫米波雷達正好滿足了這一常規微波雷達不能滿足的要求。
  10. Multiple input multiple output ( mimo ) technique, one of the most significant breakthroughs in communications field in recent years offers an effective diversity way to combat, even exploit fading

    Mimo技術作為無線通信領域近年來最大的突破，利用通道多徑效應為實現這一目標提供了強有力的技術手段。
  11. The tapped delay model of the multi - path frequency selective fading channels as well as the diversity receiver technique is introduced, and the principles of rake receiver are described. then various downlink channel estimation techniques, such as simple averaging, wmsa and fbprelms are analysed in detail

    本文首先討論了移動通信通道的各種參數對通道估計的影響，介紹了頻率選擇性通道的抽頭延遲線模型和分集接收技術，在此基礎上闡述了rake接收機的原理。
  12. The feasibility of ecological management of sugarcane pests was discussed through analysis on characteristic of ecosystem and function of bio - control and bio - diversity as well as the use of high technique in pest management

    摘要分析了甘蔗地生態系統的特點和生物控製作用、生物多樣性控製作用的方法及手段，以及生物技術等現代高新技術的應用；討論了甘蔗有害生物生態控制的可行性。
  13. This paper concentrates on the orthogonal frequency division multiplexing ( ofdm ) technique and some techniques to resist multipath fading. eliminate isi through use of a cyclic prefix. diversity techniques. using adequate ofdm combined with channel coding ( cofdm ) can enhance the ability to lower the effect of multipath fading

    本文研究了ofdm的基本原理及抗多徑衰落的一些措施，如加循環前綴，利用多徑進行分集接收，將ofdm與通道編碼及交織結合起來，頻域均衡。
  14. By applying an extended dynamic colonal selection ( dynamics ) approach and the niching technique, this paper presents a maturation detector evolution algorithm to improve the diversity and efficiency of the detectors

    摘要基於擴展的動態克隆選擇的入侵檢測模型，在動態克隆中引入小生境技術對成熟檢測器進行進化，以增加檢測器的有效性和多樣性。
  15. Synthesis mineral resource information predication has been attempted in our country, and some obtained some effects. but because of the diversity, indirection and randomicity of mineral resource information, the classical data processing technique is difficulty to get marked effects

    綜合信息礦產資源預測在我國有許多有益的嘗試，並且也取得了一些成果，但由於地學信息的多樣性、間接性、隨機性等特點，使得傳統數據處理技術難以有顯著作為。
  16. Space time coding was proposed by combining transmit diversity and coding technology to improve the system performance, such as error bit rate, data rate, and system capacity. in particular, space - time block coding ( stbc ) schemes, proposed originally by alamouti were adopted by the 3g standardization committees as one key technique in 3g wireless systems

    將發送分集與編碼調制技術相結合，進一步產生了空時編碼技術，由於空時編碼技術具有優異的抗衰落性能，並且能通過發送分集和接收分集提供高速率、高質量的數據傳輸，因此它已經成為第三代移動通信技術的重要組成部分，並將繼續在下一代移動通信技術的發展中發揮重要作用。
  17. The history of transmit diversity technique and general categories are reviewed

    並介紹了發送分集技術研究發展的歷史和大致的分類。
  18. This novel transmit diversity technique, which combines channel coding, modulation and signal processing at receive terminal, can make full use of the fading multi - path in the wireless communication systems so as to mitigate the signal attenuation. this technique is mainly designed to combat channel fading in downlink transmission by combining the technique of channel coding and that of array diversity, hence increasing the capacity of wireless communications systems and giving diversity gain and coding gain to them

    基於多輸入輸出（ mimo ）的空時編碼技術是實現未來帶寬資源日益緊張的高速無線數據通信系統的重要技術，它結合了通道編碼、調制和接收端的信號處理，能夠充分利用無線通信通道中多散射體環境所造成的多徑，從而提供信號的抗衰落性能。
  19. Among the non - coherent transmit diversity technologies, differential transmit diversity is a remarkable technique. in this thesis we consider the combining diversity of the differential transmit diversity and receive diversity. the potential of space diversity was discussed and the error performance of combining diversity system was investigated

    本論文採用聯合分集的方式將差分發送分集技術與接收分集技術相結合，進一步探討了空間分集在抗衰落方面的潛力，並對基於聯合分集技術的多天線通信系統進行了研究。
  20. Firstly, we introduce the principles of turbo codes and present the simulation results and performance analysis. secondly, considering some factors on which performance depends, we give some design criterias of turbo codes. finally, in consideration of characteristics of mobile channel, we investigate the combination of turbo coding technique and space diversity technique, namely, space time turbo coding ( sttuc ) technique

    本文緊密圍繞turbo編碼技術，首先介紹turbo碼的基本思想和原理，同時給出了turbo碼的性能模擬及分析；然後結合turbo的性能要求，給出提高編碼性能的一些設計準則；最後結合移動通道的特點，詳細的討論了具有空間分集的turbo編碼技術? ?空時turbo編碼（ sttuc ）技術。
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