change band 中文意思是什麼
change band
解釋
改變頻段-
In the next place, by studying the change of the resonant frequency of the whole system, this paper designs the circuit to track the resonant frequency of the system by cd4046 mainly. at the same time, in order to improve the efficiency and get better dynamic capability of the converter, we choose pll and fuzzy control after comparing the pll circuit, fuzzy circuit and pll ? fuzzy control circuit. in the end, this paper brings forward the control blue print to realize the drive control circuit of the high frequency converter, using the dsp chip as the key part to realize four routes of pwm drive pulses with dead band of the control system
其次，通過對整個系統諧振頻率變化的分析和研究，設計了以鎖相環cd4046為核心的鎖相環控制電路，同時，在綜合比較鎖相環控制、模糊控制以及模糊控制和鎖相環復合控制三種控制演算法的基礎上，進行了系統模擬，得出採用復合控制可使跟蹤電路既具有鎖相環路較好的穩態性能，又擁有模糊控制較好的動態性能，系統魯棒性能好，同時也提高了逆變器的效率。 -
In the sub block circuit design, the contents that the author had introduced include : the principle of band gap voltage reference and the design technique in low power supply ; the analysis of spike pulse noise rejection, frequency divider and dead time in oscillator and control circuit ; the selection of the width and length ratio of four switches and 2x / 1x mode change point in driver and mode selection circuits
在子電路設計中，作者比較深入分析的內容有:基準電路的原理及低電源電壓下基準電路的設計;振蕩器和控制電路中尖峰脈沖噪聲抑制、兩分頻電路及死區時間設定;驅動及模式選擇電路中開關管的寬長比的選擇及模式轉換點的設計。 -
It was found that nitrogen increased the fracture strength of silicon single crystal. we consider that the nitrogen may change the shockley band on silicon surface and form complex to influence the fracture procedure
本文從硅材料的基本概念入手，闡述了硅單晶材料的脆性斷裂、脆塑轉變以及在熱處理過程中的翹曲研究，並通過這三個部分進行實驗。 -
Abstract : a new waveguide which can change the wide wall of a rectangular waveguide into a symmetric arc wall is named as a cam - rectangular waveguide. comparing to sectoral waveguide, the new waveguide has the same voltage characteristics and is easier to be produced and fixed. an approximate formula of the dominant mode fields and the normalized conductance of a longitudinal resonant slot cut in the curved wall of a cam - rectangular waveguide are given. a resonant slot linear array in c & x band is designed, in which the slot voltage distribution is equiphase and the input is matched. the input voltage stationary ware ratio and the h - plane pattern of the antenna are measured. the experimental results show the conformance with theoretical results
文摘:把常用的矩形波導一個寬面改成圓弧形構成的波導稱為圓突-矩形波導.這種波導與扇面波導相比：電性能相當；波導管結構更加簡單，容易加工，便於安裝.文中給出圓突-矩形波導中主模場，圓曲面上縱向槽歸一化諧振電導近似公式.設計了c和x波段波導曲面縱向諧振縫隙線陣，縫隙電壓相位為同相分佈，輸入端匹配.實際測量了天線輸入端電壓駐波比和h面方向圖，理論與實驗相吻合 -
For parameter a, there is a close relationship exist between a ( 9, sr ) in two different radar incident angle that can be expressed as : with considering the effects of soil texture, we get the final expression of the inversion model : where mv ( t1 ), mv ( t2 ) is volumetric soil moisture content in two different temp, c, d is soil type related parameters, and v ( t1 ), s ( t2 ) is coresponding bare soil radar backscattering coefficients. inversion results show that for the c band hh polarized radarsat scansar data with a range of incidence angle from 20 to 40, the soil moisture change value can be derived with an acceptable accuracy using the above model. the temporal and spatial soil moisture change patterns are associated with rainfall and vegetation cover, as well as the soil hydraulic characteristics
利用最新發展的電磁波散射模型研究了不同植被覆蓋地表雷達波對地表土壤水分的敏感性，建立了半經驗植被雷達後向散射模型; 2 ） .研究發現在農作物等矮小植被覆蓋地表，植被層直接後向散射與植被類型相關，且在植被生長期，雷達後向散射系數對植被含水量的敏感性要高於對植被高度變化的敏感性; 3 ） .解決了單參數雷達地表土壤水分反演問題中，雷達入射角和地表粗糙度的影響這一難點問題; 4 ） .利用土壤介電模型校正了不同土壤類型對反演地表土壤體積含水量的影響; 5 ） .在以上成果基礎上，建立了完整的單參數雷達地表土壤水分變化探測反演演算法，經地表驗證，模型反演地表土壤水分變化值的精度為rmse = 0 -
Secondly, calculation theory of construction for suspension bridge is presented under the ideal condition of dead load design. linetype change stiffness of cable and slip stiffness of supporting points are deduced based on segmental catenary theory. then numerical analysis method through sgkz2000 software are introduced in detail about calculating design linetype for suspension bridge, unstressed length of cable, erection linetype of cable and pre - displacement of saddle without loads, erection linetype of wire strands, the fixed position for erecting cable band and linetype of lifting stiffening girders
其次，根據懸索橋恆載設計理想狀態建立了懸索橋施工計算原理；以分段懸鏈線索理論為基礎，推導了懸索的線形變化剛度和懸索支點的滑移剛度；介紹了懸索橋成橋設計線形計算、吊索無應力長度計算、空纜線形與預偏量計算、絲股架設線形計算、索夾安裝位置計算和加勁梁吊裝線形計算的具體方法、數值演算法及軟體sgkz2000的計算模塊的實現。 -
This paper also presents the methods of controlling unstressed length of cable, pre - displacement of saddle, anchor span tension, erection of wire strands, the fixed position for erecting cable band and cable length. determination and control approach of displacement of saddles during cable erection are also introduced. at the same time, the change course of linetype during construction period for suspension bridge is analyzed
再次，介紹了懸索橋的施工控制內容與方法，利用軟體sgkz2000對多座懸索橋進行了施工計算，提出本文關于懸索橋的主纜無應力長度控制、索鞍預偏量控制、錨跨張力控制、絲股架設控制、索夾安裝位置與吊索長度控制的方法；介紹了吊梁階段鞍座頂推量的確定與控制方法，分析了施工階段懸索橋的線形變化過程。 -
At the same time, the power capacity of the above mentioned antenna is preliminarily analyzed. the results show that in the pass band, their power capacities increase with the frequency on the whole, ranging from 10 ’ s kw to 100 ’ s kw. with the change of the pulse duration of microwaves, the measurement is carried out on the sensitivity of the detectors of the types wb - cd01 and 2087 - 6001 - 00, on the attenuation of the
通過調整微波脈寬，對wb - cd01型、 2087 - 6001 - 00型等檢波器的靈敏度，對2082 - 4137系列和tts系列衰減器的衰減量，對rg - 142型微波電纜的衰減量進行了實驗測定，結果表明:在微波脈寬大於40ns時，檢波器靈敏度基本無變化;當微波脈寬在20 ~ 40ns時，檢波器靈敏度會有一定變化，變化趨勢和程度與檢波器的型號有關;而上述型號的衰減器和微波電纜的衰減量幾乎不受微波脈寬的影響。 -
In order to avoid the current ripple and the high switch frequency of fixed - band hysteresis current controllers, two hysteresis controllers of change hystersis - band are proposed. one is the sinusoidal - band hysteresis current controller, the other is the adaptive hysteresis current controller based on fuzzy theory
由於常規的滯環電流控制器不能有效地防止負載電流脈動，並且存在著容易導致逆變器的開關器件的開關頻率過高的問題，論文提出了兩種變環寬滯環電流控制器結構，其一是正弦環寬滯環電流控制器，其二是模糊變環寬滯環電流控制器。 -
Examinations of steady status and analysis of dynamic experiments have been conducted on band - tube evaporator and parallel - flow condenser using r134a refrigerant. the steady examination show that the model error was under the allowable error, the inlet mass and enthalpy disturb experiments indicate that the subsection model, be good at reflecting the change of parameters of the heat exchanger, accord with the basic principle of thermodynamics theory and the actual work status. hence, the subsection simulation model research has important benefits both on theory and engineering application
在進行模擬試驗時，以使用r134a作製冷劑的管帶式蒸發器和平行流式冷凝器為對象，完成了穩態模擬計算、試驗和動態模擬分析，穩態計算結果和試驗數據對比表明，其誤差在允許范圍內；進口質量和焓值的擾動試驗結果表明：本文所建的區段式換熱器模擬模型，能很好的反映換熱器性能參數的動態變化，與系統熱動力學理論和冷凝器、蒸發器的實際工作過程基本一致。 -
The thesis introduces the definition of transient current and it ' s energy. the tranvelling wave can be affected by power system equipment, it ' s effect is analysed with energy change of transient current at high frequency band
討論分析了電力設備對行波的影響。提出了通過暫態電流高頻分量的能量及其能量比值變化情況定量分析變電站設備對暫態電流高頻分量的影響程度的方法。 -
After geometry optimization, their energy band structure, densities of states were calculated and analysised. we also calculated the model of doping cr, which can change the energy band structure of cdgeas2, the result is valuable for decreasing optical absorption. through the energy analysised, it was suggested that a germanium - on - arsenic anti - site defect was the most possible defect which may be associated with the 5. 5 micron absorption, the result of analysis are agreement with the research of epr, so the calculates are accurate
運用密度泛函理論計算，建立純砷化鍺鎘晶體的結構模型並對之進行結構優化，使理論模型更加接近真實結構，從而研究純砷化鍺鎘晶體的能帶結構和態密度、光學性質;分別建立砷空位模型（ vas - cdgeas2 ） ，鍺占砷位模型（ ge / as - cdgeas2 ） ，分別計算它們的能帶結構、態密度、光學性質。 -
On data transmission it use the streaming media technology and it make fluent playing in the net. on synchronize playing of multimedia it use smil language and it make the exact synchronization and automatic change media files in line with users " band. on the integration with the distributed resource web it use web service technology and make it can make seamless integration. it is more straight because of the incorpation of time thread and page
《 k12非編多媒體課程製作系統》在數據交換上採用了「國際語言」 xml ，這使該製作系統能更好地與其它系統交換數據；在數據傳輸上採用了流媒體技術，這使製作的多媒體課程在網路上的播放更加流暢；在多種媒體的同步播放上採用了smil語言，這使多種媒體在網路上播放時能準確同步，並能自動根據用戶帶寬選擇媒體文件；在與分散式資源庫的整合上採用了webservice技術，這使該製作系統很方便地實現了與分散式資源庫的整合；由於採用時間線與頁相結合的方式，亦使系統製作更加直觀。 -
The time base drift deduced by the change of temperature is discussed particularly and the compensation method of it is analyzed. finally, we also studied frequency band extension under time base distortion condition by simulation. the results show that the compensation of time base distortion can reduce the error of signal and then increase the accuracy of frequency band extension
首先，介紹時基失真的相關概念及其對測量信號的影響；其次，對時基失真特性測量的不同方法進行了理論分析和比較，並對分析信號法進行了模擬研究；再次，對時基失真的補償方法進行分析和模擬研究；並專門對溫度變化引起的時基漂移及其補償方法進行了簡要分析；最後，對時基失真條件下的頻帶展寬技術的模擬表明時基失真的補償可以減小信號的誤差，因而提高頻帶展寬的精度。 -
Zn dopent may change the crystal structure while the surface morphology becomes rough. and the band gap remains high. so the hydrophilicity of the thin film decreased
本工作表明使用噴霧熱解法可以有效的實現tio :鍍膜玻璃的制備，以及薄膜的金屬離子摻雜改性。 -
Having developed two theorems in the present thesis on the degeneracy properties of the photonic crystal in the super cell, i can give how the degeneracy will change in the band structure of the photonic crystal corresponds to the change of the translational symmetry of the photonic crystal
為了研究平易對稱性對光子晶體頻帶的影響，我在超包（ supercell ）中詳細研究了頻帶簡並的變化，並發展了幾個決定這些簡並變化的定理。 -
These interactions varies the band structure of phthalocyanine, accordingly change the absorption spectrum of mpc films
分子間的相互作用使酞菁能帶結構改變，吸收譜峰產生相應位移。 -
If the graph of the card is a star, the audience can take off the rubber band and it will change to a shape of star
這是一張星形的圖案，最後請觀眾拿下手腕上的橡皮筋，結果橡皮筋居然變成了星形的形狀！ -
In this study, we demonstrate a technique using the multi - temporal c band hh polarized radarsat scansar data to estimate the relative soil moisture change. the experiment data from sgp97 covered a whole range of vegetation growing season and different type agriculture fields
研究證明，星載合成孔徑雷達（ sar ）得到的地表後向散射系數與地表介電常數有直接相關關系，從而能夠在水文模型要求的精度范圍內有效提取地表土壤水分信息。 -
Raman spectroscopic studies show that the intensities of the d with respect to g band and the widths ( fwhms ) of raman bands can represent the change of the cnx nanotube ' s crystallinity with the nitrogen incorporation
對cn _ x納米管樣品的拉曼光譜研究結果顯示，拉曼光譜中d帶和g帶的相對強度、拉曼峰半高寬等信息可以反映由於氮原子摻雜所引起的納米管結晶有序程度的變化。
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