dds- 中文意思是什麼

dds- 解釋

  • dds : 1. Doctor of Dental Surgery 〈美國〉牙科博士。2. Doctor of Dental Science 牙科學博士。
  1. Development of auditory pure tone, brief tone stimulator with dds

    短純音刺激器研製
  2. Speed controller for step motor based on fpga and dds

    技術的步進電動機速度控制器
  3. A new method of laser range finder based on dds and dsp

    的一種新的激光測距方法
  4. Using dds to realize fast differential frequency hopping

    實現高速短波差分跳頻
  5. Luo bin ( optics engineering ) directed by yu xuecai, zong derong based on the laser mode locking principle, this paper focuses on the study of dds acousto - optic mode locker

    本文根據鎖模激光原理，進行了dds （直接數字頻率合成器）聲光鎖模器的研製。
  6. It is discoverde that with a looped feedback circuit, the dds acousto - optic mode locking has the function of tracking the frequency interval of the laser resonator longitudinal mode, and stabilizing the quality of the laser beams

    Dds聲光鎖模器在增加閉環反饋環路后，可以跟蹤激光諧振腔縱模頻率間隔變化，穩定激光光束輸出質量。
  7. This paper mainly discusses the designing and testing method to the dds acousto - optic mode locking. it also makes some further analysis on the critical technology - - - - - - the transducer acoustical membrane matching and transducer thinning, which can directly affect the performance of acousto - optic elements. it then analyses the heat effect of acousto - optic elements and the technology of transducer thinning by developing ion - beam sputtering of high frequency acousto - optic elements

    本文重點討論了dds聲光鎖模器的設計及測試方法，討論和分析了影響聲光器件性能的關鍵工藝換能器聲學膜層匹配和換能器減薄工藝，對聲光器件的熱效應進行了測試分析，對離子刻蝕法聲光換能器減薄新工藝作了一定的探討。
  8. All the theoretic and data show the project of dds signal source is realizable

    本文通過理論和實驗證明其dds信號源部分的方案是可以實現的。
  9. For a start, the principle, configuration, spectrum distribution of dds are illuminated in this paper. the distributions of spurious frequency are specially analyzed in this section

    本文首先講述了dds的原理、結構和頻譜分佈，其中重點講述了dds的頻譜分佈的雜散分析。
  10. This paper illuminates theory, structure, spectrum distribution, merits and defects, especially spurs of direct digital synthesis ( dds ), and it then introduces phase locked loop ( pll ) theory

    對dds的結構、優缺點、頻譜分佈，特別是雜散性能進行了詳細的闡述。接著，又介紹了鎖相環（ pll ）的原理。
  11. X - band radar signal frequency synthesizer based on dds - driven pll

    波段雷達信號頻率綜合器
  12. So the transparence and inter - operation are becoming the focuses on the research of dds ' s designing

    因此，有關計算機決策支持系統的構建研究逐漸轉向系統的透明性和交互性方向上來。
  13. Fpga and dvb standard are introduced firstly, dvb - c standard and composition of its system are analyzed completely, development of modulator structure and dvb - c digital modulator composition are presented, more over, analysis of respective modular are given. then, principle of dvb - c digital modulator system are presented, they are error control technique 、 mqam 、 nyquist rule and root raised cosine filter 、 window design method for fir filter 、 multi - rate signal processing ( integer interpolating, conversion of fractional sampling, equal conversion of net structure, polyphase structure for filter, poly - phase structure for interpolator, multi - stage implementation of samplying conversion ) 、 distrubited algorithm 、 cic filter 、 dds 、 cordic algorithm

    接著，專門利用一個章節闡述了dvb - c前端調制系統原理，他們了差錯控制技術、多進制調制（ mqam ） 、 nyquist準則與平方根升餘弦濾波器、有限沖擊響應濾波器的窗函數設計法、多抽樣率信號處理包括（整數倍內插原理、分數倍抽樣率轉換、網路結構的等效結構、濾波器的多相表示、內插器的多相表示、抽樣率轉換的多級實現） 、分散式演算法、 cic濾波器、直接數字頻率合成（ dds ） 、 cordic演算法。
  14. The subject derives from electronic equipment bureau of electronic information industry of department of general equipment of china. the subject researches dds ( direct digital frequency synthesizer ) signal source of the frequency agile signal generator. it plays a good role in the important pre - research project that is the test technology of tactics anti - jamming for communication transceiver synthesis

    本課題是總裝備部電子信息部電子裝備局下達的預研項目? ? 《戰術抗干擾通信電臺綜合測試技術》中的信號源部分（捷變頻信號發生器中的dds信號源部分） 。
  15. The circulation function therapeutic instrument of brain based on direct digital synthesis ( dds ) technology uses the domestic newest scientific findings and others in foreign countries. adopting the dds technology directly, it produces the safe, valid treatment. through pasting heart electric electrode on body surface, it introduces electric current to cerebral fastigial nucleus ( fn ) without damage in order to improve the state of brain blood supply and nerve conducted and something of lacking proper care to lose the symptom of coordinating with a net, increase cerebral blood flow, reduce downright bad neuron figure, district of penumbra, lighten brain perinemotoma

    基於直接數字頻率合成技術的智能腦電治療儀應用國內國際上最新科研成果，採用直接數字頻率合成技術，實現安全、有效的治療，通過粘貼于體表的電極，無創引入小腦頂核，從而改善腦供血狀態和神經傳導失調失絡癥狀，增加大腦血流量，減少半影區壞死神經元數目，減輕腦水腫，最終達到改善腦循環功能的作用。
  16. Pll has the excellent narrow - band - tracking - filtering characteristic. in this scheme, we combine the merits of dds and pll

    該方案是將dds的高解析度、高精確度、頻率變化易於控制的優點與pll良好的窄帶跟蹤性能相結合。
  17. The merits of dds such as super fine frequency resdutlon 、 high frequency accuracy 、 easy programmed can be in combination with the excellent character of narrow - band tracing filter merits of pll

    它可以將dds的超高頻率解析度、高頻率精確度、容易實現程式控制等優點與鎖相環良好的窄帶跟蹤濾波特性相結合。
  18. By making full use of favourable narrow - band tracing filter character of pll and by combining the merits of dds such as super fine frequency resolution 、 high frequency accuracy 、 very fast frequency hoping with it, the pll / pll + dds frequency synthesizer presents wide band high quality source and super small frequency hoping step. while the electronically tuned filter abates the image interference and notably improves the selectivity. the theorem of frequency synthesizer and center - frequency - fixed filter is simply but adequately introduced first in this paper

    課題中所採用的pll或dds pll鎖相頻率合成方法充分發揮鎖相環良好的窄帶跟蹤濾波特性，並結合dds的高頻率解析度、高頻率精確度和高速頻率捷變等優點，分別實現了系統所要求的高質量寬帶本振源和小步長頻率捷變；採用電調諧選頻技術，則大大改善了接收機的選擇性和抗干擾能力。
  19. In this system two oscillator are used for mixing. pll for high local oscillator and dds + pll for low local oscillator. by making full use of favourable narrow - band tracing filter character of pll and by combining the merits of dds such as super fine frequency resolution, high frequency accuracy, very fast frequency hoping with it, the pll / pll + dds frequency synthesizer presents wide band high quality source and super small frequency hoping step

    系統採用兩次混頻，其中高本振的設計採用pll鎖相環頻率合成來實現，充分發揮了鎖相環頻率合成器的優良特性，實現了系統所要求的高質量寬頻帶本振源；低本振採用pll + dds頻率合成來實現，結合pll優良的鎖相特性與dds的高頻率解析度、高頻率精確度等優點，實現了頻率的小步進高精度合成。
  20. An excellent adhesive was prepared from bismaleimide ( bmi ), epoxy resin ( e - 51 and tde - 85 ), 4, 4 ' - diaminodiphenyl sulfone ( dds ) in this thesis. the influence of liquid rubber and polymer ether imide ( pei ) on the properties ( especially high - temperature strength and the peeling strength ) were discussed, their different toughening characteristics and mechanisms were discussed. last, the process and effection of heat - resisted structural adhesive were studied by adhesive experiment of synchronizer in automobile. the results of investigation made clear : the adhesive, has good properties, especially heat - resisted properity

    根據材料分子設計的原理，研究了二苯甲烷雙馬來酰亞胺（ bmi ） 4 ， 4 』 ?二胺基二苯基碸（ dds ） e ? 51 tde ? 85組成的環氧膠粘劑體系，研究該體系在作為高溫結構膠粘劑使用時的粘接性能；然後研究了用無規羧基液體丁腈橡膠（ ctbn ? x ）和聚醚酰亞胺（ pei ）分別來增韌該體系的增韌效果；最後通過碳纖維耐磨材料與同步器圓錐環的粘接實驗，研究了耐高溫結構膠粘劑的粘接工藝和使用效果。
分享友人
分享到 Line

分享到臉書