finite gain 中文意思是什麼
finite gain
解釋
有限增益-
The antenna gain, directivity and reflection coefficient are calculated via finite element method in hfss. spline interpolation and polynomial curve fitting are applied to construct diagrams illustrating the capsulation characteristics. some general conclusions of interest are obtained
探討了各個封裝參數對輸入端反射系數、方向性系數、效率和增益等性能指標的影響，得到一些規律性結論，為射頻振子天線的封裝應用提供了參考性的建議，並指出了進一步研究的方向。 -
The numerical simulation equations of the border curves in term of and as well as the matching rules and the frequency dependence of microwave electromagnetic parameters of a broad - band homogeneous absorbing coating with a finite value of reflection loss are available. these results pointed out the direction to develop rams ". according to the radar - absorbing model, the optimized design of rams with thin - layer, light - weight, broadband and strong - absorbing is available by the simple genetic algorithms, which can effectively conduct the research work of rams to the detail. small but completely, the electromagnetic parameter ' s databases of rams that based on actual microwave absorbers have been set up, the object function has been constructed which conform to the involved goals, the adaptive coding measure is taken which extends the coding length dynamically adapting to the condition of the number of actual absorbers or the precision of thickness and absorber - volume - percentage, the decoding technique is initiated which satisfies light - weight and strong - absorbing as well as thin - layer and broadband by adopting of tracing variable restricting conditions dynamically to control total thickness. when decoding, the variable restricting conditions of thickness are dynamically traced, so gain the radar absorbing coatings of light - weight multiple - layer single - ingredient. similary, of thickness and absorber - volume - percentage, of light - weight multiple - layer multiple - ingredient. also, the rams ' demand to radar - absorb performance as frequency is met making use of the penalty function
作為遺傳演算法的具體實施：根據本實驗室近來研製的吸波材料，建立了吸波材料的相關數據庫；構造了能真實體現「薄、輕、寬、強」優化目標的目標函數；根據材料的實際數量以及塗層厚度精度要求、吸收劑體積分數精度要求，建立了能動態擴展相應碼長的自適應編碼方法；首創了通過動態跟蹤變量的約束條件來控制塗層總厚度的解碼技術，以此實現了在不弱化寬頻、高強的吸波性能目標的同時，兼顧到薄層、輕質的使用性能要求；在解碼時通過動態跟蹤厚度變量的約束條件，實現了多層單組分吸波塗層對重量輕的要求；通過動態跟蹤厚度變量的約束條件和吸收劑體積分數的約束條件，實現了多層多組分吸波塗層對重量輕的要求；使用權重系數變化法，實現了吸波塗層的分頻段吸波性能要求。 -
An accurate model to calculate the laser gain distribution within the laser medium is proposed and an analysis model of thermal effect with varied parameters is deduced. the calculated results were verified by ansys finite elements program
本文建立了精確計算激光介質增益分佈的數值模型及給出了激光棒熱效應分析的變參數計算模型，其計算結果用有限元程序進行了驗證。 -
A patch antenna with air holes in the substrate has been designed. the finite - difference time - domain ( fdtd ) method together with the perfectly matched layer ( pml ) boundary treatment has been used to study the performance of the antenna. it is shown that the surface waves are significiently suppressed, the frequency bandwidth is improved, the sidelobe levels are reduced and consequently the gain in the forward direction is improved by 14 db ( about 4 db higher than the value reported previously )
設計了一種基底鉆周期圓孔結構的電磁（光子）晶體貼片天線，用fdtd方法並結合pml吸收邊界條件對該天線進行了研究，結果表明本文所設計的基底鉆孔型電磁晶體貼片天線取得了多方面的性能改善，與普通天線相比，基底中的表面波受到很大抑制，天線的帶寬增加，遠場方向圖上天線的旁瓣和背瓣被明顯削弱，向前輻射的增益由原來的12db增加到26db ，增加了14db ，比文獻上報道的gonzalo等人的研究結果提高了4db 。 -
By using finite element method, the thesis analyses the problem of quasi - static and dynamic meshing. its research mainly contains : 1 、 gain precise geometric information of the spiral bevel gear from adjustment block of gleason machine tool, then form relevant cad format files
本文以有限元法為基本手段，研究了螺旋錐齒輪嚙合過程中的準靜態和動態嚙合問題，主要的工作包括: 1 、基於gleason機床調整卡獲得螺旋錐齒輪的精確幾何信息，形成相應的cad格式文件。 -
This study will gain an understanding of the earthquake response behavior of such a special structure and will also provide a basis for monitoring of bridge after opening to the traffic. in this work, a 3 - d nonlinear finite element program tty is developed the results of analysis are in good agreement with that of the bathe and changsha tiedao university ' s report about earthquake response of the dong ting hu bridge
根據理論分析結果，本文編制了三維非線性有限元程序tty ，對端部作用有集中力的彎梁作了幾何非線性計算，並與bathe等進行比較；同時對湖南洞庭湖大橋進行了線性與非線性分析計算，並與長沙鐵道學院洞庭湖大橋抗震性能研究報告進行了對比，其結果均能較好吻合。 -
The analytical solutions of the gain, dispersion and population difference in the steady state of an open ladder lasing without inversion ( lwi ) system are at first given when the phase fluctuation of the driving field is considered. then the effects of the driving field phase fluctuation on the gain, dispersion and population difference are analyzed by the numerical results from the analytical solutions. our research shows that the phase fluctuation of the driving field will results in a finite line width ; with the line width increasing, the gain decreases monotonously, however, variation of the dispersion isn ? t monotonous, it has a maximum value when the line width takes some value ; the line width varying can ? t lead to change lasing from without to with population inversion
給出了有驅動場位相漲落的開放的梯型無粒子數反轉激光（ lwi ）系統增益、色散和布居數差的定態解析解，進而用得到的數值計算結果分析了驅動場位相漲落對增益、色散和布居數差的影響.研究結果表明，驅動場位相漲落將導致有限線寬;隨著線寬的增加，系統增益單調地減小，但系統色散的變化並不是單調的，當線寬取某個值時，色散有極大值;線寬的變化不能導致無反轉激光向反轉激光的轉變 -
However flux leakage is really exist, calculation through formular analytic method has more error, so electromagnetic field analysis is made by using finite element method ( fem ) in ansys7. 1 / multiphysics and ansys / emag programs. typical quantities of interest in a magnetic analysis are available such as magnetic flux density, magnetic field intensity, magnetic forces, power loss and flux leakage in the system of magnetic levitation. then gain the current in the coil which control levitation gap when the stage is stable
由於存在漏磁，用公式的解析法計算有很大的誤差，因此本文採用有限元法（ fem ）來計算磁懸浮系統磁場分佈，從而計算磁力，通過用ansys7 . 1軟體進行有限元電磁場分析計算，得到平臺穩定懸浮時電磁線圈所需電流、懸浮氣隙等控制參數，由於設計的磁懸浮系統為非軸對稱結構，採用2d磁場分析有一定的誤差，而採用3d電磁場分析更接近實際。 -
Then we analyze the static character of sbs to obtain the sbs gain factor and threshold under continuous wave and pulse. because there is no stokes seed in fiber hydrophone system, we analyze the sbs based on the noise initiation of sbs model. we use the finite differential time domain method to do the sbs numerical simulation in fiber
由於光纖水聽器中的sbs是在沒有種子光注入下產生的，於是我們推導了噪聲激發模型下描述sbs的耦合波方程組，對該方程組使用時域有限差分法進行了數值模擬，並推導了連續光和脈沖光下的閾值。 -
But actually, the vector sensor ' s detection gain will be limited by the finite noise counteract for the existence of anisotropic component in the noise field
但實際中，由於噪聲場中存在各向異性成分，噪聲的聲能流只能被有限抵消。 -
This dissertation brings forward a new method of modeling and simulation on interconnect ? fem - vfm, which combines finite element method with vector fitting method. we can get the scatter / admittance / impedance ( s / y / z ) parameter by fem in frequence domain, gain the equivalent spice circuits of interconnect structure by vfm, and extract the circuit ’ s parameters which are used to analyze in time domain. this method lets the simulation not only contain the information of pcb ’ s structure but also have a sustainable computing speed
首先通過電磁場數值分析方法?有限元法（ fem ）對互連結構進行模擬分析，而得到的散射/導納/阻抗矩陣參數（ s / y / z矩陣參數） ，然後通過矢量擬合方法（ vfm ）把s / y / z矩陣參數轉化為等效spice等效電路模型，並且提取出電路參數，完成了頻域到時域的轉換，最後使用電路模擬器進行時域模擬，從而開發出了一系列高速數字pcb板設計規則。 -
The model ' s parameter was applied to gain the theoretical stress - strain - volume change curves and used to compare with the experimental stress - strain - volume change curves to verify the rationality of it. the newly proposed model is applied in the finite element program, the new program was applied in finite element stress - strain analysis of zipingpu reservoir concrete faced rockfill dam, and at the same time compare with the result of the widespread model ( such as e - u model ) to test and verify its rationality initially
利用求取的模型參數得出理論擬合曲線，進行理論擬合曲線與試驗實測曲線比較，驗證建議模型的合理性；對有限元程序進行修改，加入建議模型子程序模塊，採用建議模型並對壩體進行有限元應力應變計算，同時與目前應用較廣泛的模型（如e - u模型）計算結果比較，初步驗證建議模型和合理性。
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