預增頻 的英文怎麼說

中文拼音 [yùzēngbīn]
預增頻 英文
accentuation
  • 預 : Ⅰ副詞（預先; 事先） in advance; beforehand Ⅱ動詞（參與） take part in
  • 頻 : Ⅰ形容詞（次數多） frequent Ⅱ副詞（屢次） frequently; repeatedly Ⅲ名詞1 [物理學] （物體每秒鐘振動...
  1. The raw materials, the composition, the time of milling, the calcining temperature, the different additives, the sintering temperature and the sintering parameters were investigated. the result showed : it was advantaged to obtain high initial permeability mnzn ferrite with stable frequency characteristic using high - purity raw materials ; in order to obtain mnzn ferrite with high properties, we must control strictly the composition ; it could improve the properties of mnzn ferrite by optimizing calcining temperature. the lower calcining temperature made the permeability higher, and the higher calcining temperature could promote the frequency characteristic of permeability ; we chosen the right time of milling according to the requirement of power diameter ; in order to improve the properties of mnzn ferrite, it is necessary to add effective additives. in this dissertation, the influence of bi2o3 、 moo3 、 k2co3 、 co2o3 were investigated ; the sintering temperature, the time of heat - retaining and sintering parameters were the key factors of preparing high permeability mnzn ferrites

    研究結果表明:採用高純度的fe2o3有利於獲得高起始磁導率且頻率特性優良的鐵氧體;為了制備所需性能的鐵氧體，需要嚴格控制配方中各種原材料的含量，優化配方;由於粉體活性受預燒條件的影響，所以對不同要求的鐵氧體選擇的預燒條件就不一樣，適當降低預燒溫度有利於獲得較高的起始磁導率，而為了獲得良好的頻率特性可以適當地提高預燒溫度;根據對粉體顆粒粒徑的不同需求，可以選擇不同的球磨時間;而有效的添加劑是改善材料性能的必要條件，本文在添加劑的研究中主要對bi2o3 、 moo3 、 k2co3 、 co2o3的影響分別作了詳細地討論;燒結溫度、保溫時間和燒結氣氛是高磁導率mnzn鐵氧體制備最關鍵的工藝，適宜的燒結工藝可以獲得理想微結構和組成，從而得到高性能的鐵氧體材料;而從材料的微結構上來看，要提高材料的截止頻率，就要適當地細化晶粒、增加晶粒內部的氣孔。
  2. The basic principle, main properties, typical parameters, technical characteristics and general situation of klystron are introduced. the electron beam prebunching in the modulated cavity and shift tube of relativistic klystron amplifer ( rka ) is studied analytically, a self - consistent equation of radiation generated by the prebunched electron beam in the radiation cavity is derived using the field method of particle ? wave interaction instead of the electrical circuit method, and in terms of it, the gain in the linear regime calculated, a field analysis method is proposed. the theory analysis shows that the characteristic parameters, such as resonance frequency, real part of gap - impedance, external quality fadtor in all kinds of klystron output circuits including single - beam, multi - beam, single - gap, multi - gap, single - beammulti - gap, multi - beam multi - gap klystron output circuit, can be calculated by the field analysis method

    本文系統的介紹了速調管的工作原理、主要特點、發展概況、主要性能指標和技術特點，解析的研究了電子束在相對論速調管放大器的調制腔和漂移管中的預群聚;用粒子波互作用的場方法導出了在輻射腔中預群聚電子束產生輻射的自洽方程，同時對線性區的增益進行了計算。理論分析表明，場分析法可用於計算單注單間隙、多注多間隙、單注多間隙和多注多間隙速調管輸出迴路的諧振頻率、間隙阻抗實部和外觀品質因數等特性參數。
  3. However, this approach is faced with two key challenges. first is the keen competition from fast emerging ports in southern china, in particular the prd region, which has been assessed in the latest round of the study on port cargo forecasts. one of the conclusions of the study was that although neighbouring ports offer lower monetary costs, ours has the advantages in terms of high frequency of callings, extremely efficient operation and associated logistics services

    首先是華南一帶的港口，近年冒升之勢甚速，儼然成為香港的強大競爭對手，其中尤以珠江三角洲的港口為甚；我們已透過最新的港口貨運量預測研究，分析這趨勢對我們的影響；研究結論指出，雖然珠江三角洲港口收費低廉，但香港卻在頻密的船期，作業迅速有效，以及物流增值服務上，較鄰近港口優勝。
  4. Through the experimental result of the various methods of pretreatment, the effects were illuminated ; appraisal of every kind pretreatment method was given ; the optimal scheme of enhanced fingerprints based on the fourier transform and direction information was determined, and the standard of the comparing pretreatment algorithm was proposed

    通過實驗說明了各種指紋預處理方法的效果；結合特徵點變化，給出了各種預處理方法的評價；確定了基於傅里葉變換結合濾波和方向信息的頻域濾波增強指紋的最佳方案，並提出了比較預處理演算法的標準。
  5. 2. based on the multivariable frequency control theory, a multi - variable computer - aided design software is designed using visual basic 6. 0 after decoupling the controller model, the precompensation matrix, the dynamic compensation matrix and the feedback matrix are obtained

    二、以多變量頻率域控制理論為基礎，結合現代控制理論對該數學模型進行解耦設計，利用vb6開發了一個多變量系統的輔助設計軟體，得到它的預補償陣，動態補償陣和反饋增益陣。
  6. The adaptive front - end has the adaptive ability for the magnitude and frequency of input signals. it can prefilter for the input signals, eliminate the useless signals, and improve the dynamic range of receiver system. it can lessen the burden of digital signal processing in the back - end of receiver, and improve the performance of receiver system

    自適應接收機前端對輸入信號有自適應能力? ?頻率自適應和幅度自適應，這樣的前端就可將系統的接收中心頻率和帶寬自適應到輸入信號的頻率和帶寬，其實就是對輸入信號進行一次預分選、預濾波，剔除對接收系統毫無作用的信號;同時對大信號自動減小增益，對小信號增加增益，提高系統的動態范圍;而且可以對干擾信號進行壓制。
  7. Using the order - up - to ( out ) method and two demand forecasting patterns, that are exponential smoothing forecasting and moving average forecasting, we give the frequency response plot and the noise bandwidth figure with the help of the system control tool of matlab. we show that information sharing helps to reduce the bullwhip effect, especially at higher levels in the chain. however, the bullwhip effect problem is not completely eliminated and it still increases as one moves up the chain

    本文的重點內容就是用控制論的理論和方法來研究牛鞭效應，應用補充到目標庫存策略（ out ）和兩種不同的需求預測方法，即指數平衡預測法和移動平均數預測法，用matlab的系統控制工具箱作為分析工具，分別給出了信息共享情況下和無信息共享情況下的頻率響應圖和帶寬比較圖，證明了信息共享能夠減弱牛鞭效應，尤其是在供應鏈的高級階段，但牛鞭效應並不能完全消除，仍舊隨著供應鏈階段的上升而增加。
  8. It discusses motion - detector response to narrow - band image motion and to broadband images. studies show that the motion - detector can provide velocity estimates in organism ' s natural visual environment, and physiological prefilters can improve determination of velocity of moving image

    研究表明：運動檢測器可以精確檢測多頻譜自然圖像速度，在運動檢測器前增加生理學預濾波環節可以改善圖像運動速度的估計。
  9. Secondly, two carbon fiber reinforced composite beams were fabricated, and their modal frequencies were measured by an experiment method. thirdly, delaminations were modeled by pairs of nodes with the same coordinates but different node numbers, while the modal frequencies of these beams with different delamination location and size were computed by an eas piezoelectric solid element. moreover, a novel method combining computational mechanics and neural network was demonstrated for composite health monitoring ; the first five flexure modal frequencies obtained by fem were modified by a primary revising approach and were used to train the neural network

    本文較全面地評述了神經網路的應用模型、改進演算法等，編制了bp神經網路程序：制備了纖維增強復合材料試件，並進行實驗模態分析；利用坐標相同、節點號不同的方法模擬脫層損傷，基於eas列式的壓電固體單元計算了不同脫層損傷情況下的頻率信息；針對基於實驗數據訓練神經網路存在樣本不足的缺陷，本文提出了利用有限元方法對含有脫層損傷的復合材料試件進行數值模擬，以前五階彎曲模態頻率構建訓練樣本的新思路，並提出了一種初步的計算值修正方法，以此構建神經網路的訓練樣本：將實驗模態分析的結果送入訓練好的神經網路進行預測，實現了對復合材料梁的脫層損傷的定位和損傷程度的評估。
  10. We have studied pretreatment of fingerprint images with experiments, including all the algorithm implementations of the normalization of fingerprint image, estimation of orientation and frequency field, fingerprint image enhancement, extraction of fingerprint ridges, and thinning of fingerprint ridges. the result can be accepted

    本文對指紋預處理進行了實驗研究，編程實現了指紋圖像歸一化，指紋圖像方向場的計算，頻率的計算，指紋圖像的濾波增強，指紋圖像的紋線提取（二值化） ，紋線細化。
  11. The dynamic behavior of sunflower - patterned cable dome and sunflower - patterned cantilever roof are analyzed. the effects of prestress on the frequency and mode is considered, the results show that the frequency is increased with increasing the prestress, but prestress affects more on lower order frequency than higher

    分析了葵花型索穹頂結構和葵花型張拉挑蓬結構的動力特性；考慮了預應力對這兩種結構自振頻率和振型的影響，結果表明，預應力增加，這兩種結構的自振頻率也增加，但預應力對低階頻率比高階頻率影響大。
  12. " while the bond markets benefited from expectations of a deceleration in growth in the us, the equity markets experienced a late rally from positive earnings and mergers and acquisitions activities

    他說：市場預期美國增長放緩令債券市場受惠，股市方面則因為企業盈利理想以及並購活動頻繁而在下半年大幅回升。
  13. The bond markets benefited from an expectation of a slowdown in growth in the us, while the equity markets experienced a rally in the latter part of the year because of positive earnings figures and mergers and acquisitions

    年金融市場表現異常反覆，預期這個情況會持續下去。市場預期美國增長放緩令債券市場受惠，股市方面則因為企業盈利理想以及並購活動頻繁而在下半年大幅回升。
  14. Finally, the method of dim small target detection and tracking based on the wavelet transform and mathematical morphology is described, which increases the image of target and gets rid of the noise which is high frequency, then, making use of information of inter - frame, it tracks the target more effective

    該方法首先利用了小波變換和形態學的原理，將小波變換和數學形態學結合對圖像作預處理，濾除圖像背景中的大部分高頻噪聲，增強了目標圖像。進而再利用目標的幀間信息，對目標區域作幀相關，進一步確認目標。
  15. The rooms has realized access to wide band web, vod order program and intelligentized management system. thus customers are able to enjoy multi - media interactive services such as inner shopping, ordering a dinner or plane tickets.

    商務客房實現寬頻上網，並增設了飯店智慧化管理系統，實現vod視頻點播，賓客不出房門便可以享受內部購物訂餐點菜預訂機票查詢本人消費情況等多媒體互動式服務。
  16. And the inverter becomes smarter. during the designing, the pulse - processing ciucuit is preset which processes the feedback pulse from photoelectric encoder for close - looping the system in future. by using the circuit and quadrature mode of timer 1 in 80c196mc, incremental encoder can be embedded into the velocity regulation system more easily and the domain the inverter can be used in is enlarged too

    在系統設計過程中，考慮到了變頻調速器進一步改進為閉環系統的需要，在電路中預設了光電碼盤反饋脈沖的處理電路，通過這個電路的處理，並利用80c196mc中定時計數器1的90相移計數工作方式，可大大簡化使用增量式光電碼盤時脈沖處理的復雜度，這也擴大了本文中變頻調速器的應用范圍。
  17. The dynamic bit rate allocation module receives relevant data from the loss rate of multi - media data packet, jitter, delay, and compares these data with predefined values to make one of these 3 decisions that : decrease the video bit rate ( stat = decrease ), or maintain current video bit rate ( stat = hold ), or increase video bit rate ( stat = inccease ). the video bit rate will be adjusted according to the decision and the total bit rate is changed accordingly. in this way the impact of network environmental variation is settled, and consequently the adaptability of videoconference systems in remote education area is improved

    整個模型從rtcp協議獲得多媒體數據包丟失率（ lossrate ） 、抖動（ jitter ） 、延時（ delay ）的相關數據，這些數據與預先設定好的閥值作比較，得出減小視頻位速率（ stat = dectease ） 、維持視頻位速率不變（ stat = hold ）或增大視頻位速率（ stat = increase ）的決定，模塊根據這些決定對視頻位速率進行相應的調整，從而總的位速率也相應變化，這樣可以減小由於網路環境變化而帶來的影響，從而提高視頻會議在遠程教育應用中的實用性。
  18. The high incidence of financial instability and crisis, from the late 1990s to the present time, has spurred the development of analytical methods for the assessment of the robustness of the financial sector, its exposure to risk and its vulnerability to shocks. quantitative tools include indicators of financial sector soundness, early warning systems, sensitivity analysis and extreme scenarios ( “ stress tests ” ), and financial forecasting

    20世紀80 、 90年代以來，由於金融危機在各國的頻繁發生，特別是亞洲金融危機的爆發，金融危機更易傳染，也更具有危害性，這些都使得國際上對于各類金融部門的穩定性的數量評估方法研究迅速增加，這些數量的方法包括:金融穩健指標，早期預警系統，敏感性分析和壓力測試。
  19. We chose suitable tcp throughput model to estimate the available bandwidth correctly, using the estimated round trip time and packet loss ratio for the next time interval as parameters of the model to achive the accuracy of estimated network bandwidth. as the observed losses and round trip time vary very dynamically, adjust the sending rate equivalent to the amount of tcp throughput may result in a rather fluctuant sending rate. so we present a rate adjustment like tcp congestion control based on aimd, which increases its sending rate by an additive inereease rate

    根據mpeg4視頻流應用的特點，選擇合適的吞吐量模型，進行合理的參數估計，並根據計算出的帶寬進行相應的速率調整來實現擁塞控制，我們使用未來rtt的估計值和分組丟失率的估計值作為吞吐量模型的參數，增強了控制的實時性，弱化了業務的振蕩性，提高了帶寬預測的準確性；在進行速率調整時，不是簡單地將發送速率調整到與tcp吞吐量模型一致，而是採用類似tcp的aimd策略來調節發送速率，減小了發送速率的振蕩性。
  20. ( 2 ) interframe prediction model researching on the existing video scalable coding structure and the predict - tion model shows that the information between frames of video sequence was not utilized fully to improve coding efficiency in these coding scheme, especially the prediction of b frame in the enhancement layer

    （ 2 ）幀間預測方式通過對這些主流可分級編碼方法的預測方式進行分析與研究表明這些方法並未能很好地利用視頻序列的幀間信息來進行幀間預測以提高視頻編碼效率，特別是對增強層b類幀的預測。
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