選頻特性 的英文怎麼說

中文拼音 [xuǎnbīntèxìng]
選頻特性 英文
frequency-selection characteristic
  • 選 : Ⅰ動詞1. （挑選） select; choose; pick 2. （選舉） elect Ⅱ名詞（挑選出來編在一起的作品） selections; anthology
  • 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...
  • 特 : Ⅰ形容詞（特殊; 超出一般） particular; special; exceptional; unusual Ⅱ副詞1 （特別） especially; v...
  • 性 : Ⅰ名詞1 （性格） nature; character; disposition 2 （性能; 性質） property; quality 3 （性別） sex ...
  • 特性 : characteristic（s）; character; performance; features; properties; behaviour; response; character...
  1. The characteristics of different nonlinear crystals for frequency - doubled nd : yag 946 nm laser have been compared, a biaxial crystal, lbo, has been chosen for frequency doubling in our experiment

    給出了幾種晶體用於946nm倍頻時它們倍頻特性比較，為優化選擇倍頻晶體提供了依據。
  2. 3. introduced the principle of phase - match and the optics characters of ktp 、 lbo and other nonliner crystrals, demonstrate the optimal focusing conditions. based on a detailed analysis, ktp and lbo are selected as shg and thg cystal, respectively

    3 .簡單介紹相位匹配原理和非線性晶體的選擇介紹了一些紫外晶體的光學特性，並闡述了光束的最佳聚焦條件，經過分析和綜合評價，選擇了ktp和lbo分別作為倍頻晶體及和頻晶體。
  3. This system is possible to deploy onto the rov to have an extra safety control

    文中將分別對于傳感器的特性，水聲頻響的選擇以波浪之影響分別加以說明。
  4. This paper concerns studies on rhizobia in symbiosis with important legume soybean and peanut crops in china, following : 1 ) summarized bio - diversity of rhizobia, including indigeneous population, isolation frequency, strain type, distribution, and strain - host promiscuity and compatibility from large and small samples. 2 ) reviewed symbiont improvement in both sides of rhizobia and hosts, involving selection of effective rhizobial strains, evoluation and utilization of the host germplasm for symbiotic properties, and selection of the both sides for special characters. 3 ) discussed the subject on the rich symbiont germplasm resource in china and on further research being necessary to exploitation and utilization of the benificial germplasm

    針對我國主要豆科作物大豆和花生的研究成果，並結合本身研究工作內容， （ 1 ）總結了與宿主共生的根瘤菌生物學多樣性，包括大、小樣本的土著根瘤菌群體數量、分離頻率、類型與分佈及其菌株宿主共生混交性與親和性； （ 2 ）評述了根瘤菌宿主植物共生體雙邊固氮改良，包括優良菌株的選育、宿主品種資源共生特性的評價與利用及特異性狀的選擇； （ 3 ）討論了我國這一類共生體資源的豐富性以及有必要進一步加大力度研究有益資源的開發和利用的問題。
  5. Abstract : this paper concerns studies on rhizobia in symbiosis with important legume soybean and peanut crops in china, following : 1 ) summarized bio - diversity of rhizobia, including indigeneous population, isolation frequency, strain type, distribution, and strain - host promiscuity and compatibility from large and small samples. 2 ) reviewed symbiont improvement in both sides of rhizobia and hosts, involving selection of effective rhizobial strains, evoluation and utilization of the host germplasm for symbiotic properties, and selection of the both sides for special characters. 3 ) discussed the subject on the rich symbiont germplasm resource in china and on further research being necessary to exploitation and utilization of the benificial germplasm

    文摘:針對我國主要豆科作物大豆和花生的研究成果，並結合本身研究工作內容， （ 1 ）總結了與宿主共生的根瘤菌生物學多樣性，包括大、小樣本的土著根瘤菌群體數量、分離頻率、類型與分佈及其菌株宿主共生混交性與親和性； （ 2 ）評述了根瘤菌宿主植物共生體雙邊固氮改良，包括優良菌株的選育、宿主品種資源共生特性的評價與利用及特異性狀的選擇； （ 3 ）討論了我國這一類共生體資源的豐富性以及有必要進一步加大力度研究有益資源的開發和利用的問題。
  6. We discuss the characteristic of wireless channel and hf " s at the forepart of the paper and, analysis several typical model about hf channel, and consider the math representation and statistic characterization, after that we select watterson hf channel model as the simulated model in this paper

    在論文開始我們討論了無線通信通道的傳播特性和高頻通道的傳播特性，分析了高頻通道的數學表述和統計特性，最後我們選擇了watterson高頻通信模型作為本論文的模擬和模擬模型。
  7. 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。
  8. In terms of their frequency responses, the best choices for medical image interpolation : the 6 6 blackman - harris windowed sinc interpolator, and the c2 - continuous cubic kernels with 6 and 8 supporting point. in terms of the quantitative error and evaluations, in practice the best choice is the cubic kernel with 6 supporting points

    根據各插值核的頻率響應特性，更好的是6 6的blackman - harris窗和二階導數連續的6 6和8 8的三次核；從實現效率和放大效果上看，實際中理想的選擇是6 6的三次核。
  9. Two simulation algorithms of realization channel characteristic are analyzed emphatically : shaping of slow fading with correlation and generation of frequency - selected multipath fading

    重點分析了實現通道特性模擬的兩種演算法：慢衰落的相關性整形和頻率選擇性多徑衰落。
  10. Then the measured frequency characteristic can be converted to high accurate transfer function with curve fit method, rational initial parameters choice and fitting in different frequency range method

    使用曲線擬合方法，輔助以合理的初始參數選取及分段擬合方法，將測量得到的控制對象頻率特性轉化為高精度的傳遞函數。
  11. We analysis the characters of double - clad fiber laser with mode selected based on fiber bragg grating in double - clad fiber

    對光纖bragg光柵選頻雙包層光纖激光器的特性進行了分析。
  12. Transmission characteristics of far - infrared frequency selective surface

    遠紅外頻率選擇表面的傳輸特性分析
  13. 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。
  14. The dissertation discussed the theories of second - harmonic generation for negative uniaxial optical crystal and summarized properties of nonlinear optical crystals, which are subjected to ultraviolet second - harmonic generation, and represented the theorizational law of double frequency crystal select ( tldfcs ). at present, bbo crystal is the most subjected to commercial crystal of ultraviolet second - harmonic generation according to compared kdp, bbo, clbo, kabo and kbbf crystals based on tldfcs

    論述了負單軸晶體的倍頻理論，總結了適用於紫外倍頻的非線性光學晶體的特性，提出了倍頻晶體選擇的理論依據，並根據該依據通過比較，最後選定bbo晶體為目前最適宜用於產業化的紫外倍頻晶體。
  15. The stability output second harmonic generation ( shg ) experiment results of single - longitudinal mode and multi - longitudinal mode with long cavity were explained reasonably with these rate equations. the high polarization of fundamental wave in the isotropic laser media nd : yag with type - i critical phase - matching lbo was studied with the rate equations including polarization of fundamental light. using the polarization function of lbo, a quartz full - wave plate was introduced into the cavity, a kind of birefringent filter by considering the combination of the polarization function of the type - i critical phase - matching doubling frequency crystal lbo and the quartz whole - wave plate was constructed

    將腔內多縱模倍頻速率方程推廣應用到準三能級藍光激光器中，分析了一個縱模、兩個縱模、多個縱模時的噪聲情況，合理地解釋了實驗中激光器單縱模運轉以及長腔多縱模運轉時穩定輸出的實驗現象，同時利用該速率方程分析了以各向同性激光晶體nd : yag為工作物質，類臨界相位匹配lbo為倍頻晶體的藍光激光器中基頻光偏振特性，合理利用類臨界相位匹配lbo倍頻晶體的偏振特性與引入的石英晶體全波片構成雙折射濾光片，通過選單頻來抑制噪聲，獲得了藍光低噪聲的穩定輸出。
  16. Based on it, a new kind of helix slow - wave structure named elliptical helix slow - wave structure used in helix traveling wave tubes has been detailedly investigated. by studying the rf characteristics of this slow - wave structure, it ’ s found that higher operation frequency and interaction impedance will be obtained by increasing the eccentricity of helix or decreasing it of the shield. meanwhile, great potential of improving system bandwidth has also been found if the eccentricity of helix or shield or the two are properly choosed

    本文對近幾十年大功率行波管的研究進展進行了簡單討論，並在此基礎上研究了一種可應用於螺旋線行波管的新型的螺旋線慢波結構，即橢圓螺旋線慢波結構，通過對該螺旋線高頻特性進行詳細分析，我們初步認為，選擇適當的螺旋線和屏蔽筒離心率，可以提高系統工作頻率，增加系統耦合阻抗，並且具有改善系統帶寬的潛力。
  17. The self - q - switched pulses of high erbium - doped fabry - perot cavity fiber laser are observed and theoretically analyzed. ( 2 ). utilizing the non - linearity characteristics of single mode fiber - back stimulated brillouin scattering ( bsbs ) and the wavelength - selecting characteristics of fiber gratings, self - q - switched pulses are achieved from a linear cavity erbium - doped fiber laser pumping by a 980nm ld continue wave ( cw ) pumping, the pulse width is 2. 2ns and the repetition frequency of pulses is 64. 5mhz

    （ 2 ）利用單模光纖的非線性效應背向受激布里淵散射（ bsbs ）和光纖光柵的選頻特性，採用980nm半導體激光器連續泵浦方式，在線性腔摻鉺光纖激光器中實現了自調q運轉，獲得脈沖寬度（ fwhm ）約為2 . 2ns ，重復頻率為64 . 5mhz的穩定的光脈沖輸出。
  18. Moreover, a novel method is also proposed to using pdp driving ic to perform the traditional pwm modulation. the shared platform is also discussed. besides the circuit design and program, in the paper, according to the typical equivalent pixel unit circuit, analyze the key parameter of the circuit by the support of theory formula deduction, analysis and simulation. it ’ s favorable to improve the high - frequence property of fed sample and enhance the display quality

    實際上，文中還提出了採用pdp驅動晶元進行pwm調制的控制方法和相應驅動波形設計，並就與子行灰度調制方法共享有關硬體和軟體平臺來驅動fed顯示屏進行了有益的探討。除了電路製作和控制編程外，本文從fed顯示屏典型像元的等效電路入手，採用理論公式推導、分析和模擬結合，指出了驅動電路設計中的關鍵參數選擇準則。這有利於改善fed整機的高頻特性，提高fed的顯示質量。
  19. At the aspect of motor control arithmetic design, it adopts the technology of frequency rising and falling control to control stepmotor according to the stepmotor ’ s characteristic of the moment and frequency ; it adopts double loop pid control arithmetic to control ac and dc servomotor according to the characteristic of ac and dc servomotor

    控制演算法方面，針對步進電機獨特的矩頻特性，選用了升降頻技術進行控制;針對交直流伺服電機的特性，選用了雙閉環pid控制演算法進行控制，均得到了較好的控制效果。
  20. For getting better filter performance, we design quadrature mirror filter banks using window function method. considering the frequency response of filter change rapidly, we make the filter is perfect reconstruction on the point of center frequency. the error of reconstruction is small by the point

    考慮到濾波器組在過渡帶出現的其幅頻特性變化的情況，選擇在兩個濾波器交疊的中心頻率處，使其滿足濾波器的完全重構條件，其附近頻率處的誤差也降到很小的范圍之內。
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