Shadow effect can not be neglected for thermal analysis of spacecraft,Accroding to the angle between solar light and antenna orbit plane and its orbit location,analytical geometry method was used for accurately calculating solar radiation heat flux distribution of reflector surfaces.To analyze the temperature field under heat flux,the formulations of net radiation flux density between two gray elements and the net flux density of gray surface under external thermal flux were deduced.Based on the characteristic of space environment,the nonlinear temperature distribution in transverse direction of reflector shell self radiation were considered,the finite element formulations were given for orthogonal material layered shell by Galerkin method.A layered element including a inner heat source layer was proposed,and the finite element formulation expressed by DOF of the inner heat source layer were put forward with temperature and heat flux boundarys between adjacent layer.

單饋反射面賦形天線是未來星載天線發(fā)展的一個重要形式2021国产免费牲交视频免费，分析了基于物理光學(xué)国产99、幾何光學(xué)和幾何繞射理論的理想反射面輻射場；介紹了基于幾何光學(xué)的反射面天線賦形方法爱情岛论坛高清无码；針對賦形過程中輻射場的快速分析要求久久精品久久精品国产大片，比較分析了基于物理光學(xué)的Fourier-Bessel和Jacobi-Bessel級數(shù)展開方法以及GB展開分析方法；利用GB展開快速分析方法在20GHz頻率下對0.6m口徑的天線進(jìn)行賦形分析91最新免费网站网址，實(shí)現(xiàn)中國大陸的30dB增益覆蓋一区二区色，通過數(shù)值計算研究了固定增益期望下的口徑尺寸隨頻率的變化，以及頻率為20GHz的不同尺寸天線賦形后的覆蓋目標(biāo)區(qū)域最大增益的變化情況免费黄色一级网站。

Third, rail-to-rail AMPLIFIER OUTPUT stages exhibit load-dependent gain which affects AMPLIFIER open-loop gain, and hence closed-loop gain accuracy.

第三av毛片在线看，軌到軌放大器的輸出狀態(tài)表現(xiàn)出影響開環(huán)增益從而影響閉環(huán)增益精度的負(fù)載增益效應(yīng)。

The results indicate: 1 closed- loop gain and open-loop gain to meet basic relationship; 2 the stability of feedback is enhanced and output resistance increased. Furthermore, the result of open-loop and closed-loop gain of theoretical calculation is consistent with simulation which is applied by EWB software, which confirmed elementary conclusions and relationships in negative-feedback amplifier quantitatively.

結(jié)果表明：閉環(huán)增益與開環(huán)增益滿足基本關(guān)系式一级毛片免费视频网站；引入負(fù)反饋后穩(wěn)定性得以提高毛片网址站，輸出電阻增大；同時使用EWB對開環(huán)與閉環(huán)增益也進(jìn)行了仿真分析精品黄色网站一级，結(jié)果與理論計算一致国产一区二区免费A片，從而定量地驗(yàn)證了負(fù)反饋放大電路中的結(jié)論與關(guān)系。

The principle of the amplifier is get the value of the feedback resistance which can change the gain of the amplifier , then make sure the relay on the right stall, we can get the expectation gain.

本設(shè)計實(shí)現(xiàn)增益控制的原理是根據(jù)OP37G的放大原理公式計算出實(shí)現(xiàn)指標(biāo)增益所需要的反饋電阻值亚洲自拍在，使用10K繼電器選擇相應(yīng)電阻實(shí)現(xiàn)增益www.操逼。com。

Based on the establishment of a model of silicon dioxide structure, the effect of germania concentration across the fiber core on Raman gain spectrum was analyzed by the method of Gaussian decomposition.

分解圖譜表明摻雜物破壞了二氧化硅的分子結(jié)構(gòu)，并在拉曼增益范圍內(nèi)產(chǎn)生了新的峰值韩国A级毛片免费久久，從理論上證明了光纖摻雜物對拉曼增益系數(shù)和增益譜的影響欧美一级在线观看影片。

Experiments were made to investigate how the spectrum of the stimulated Raman scatting gain changes with germania concentration and different pump power.

研究了受激拉曼散射增益系數(shù)和增益譜與泵浦功率、光纖摻雜濃度的關(guān)系欧美乱操屄片，得出增益系數(shù)和峰值頻移量由光纖特性決定黄色A片免费看一级，而與泵浦功率無關(guān)的結(jié)論。

With the gain-boost technology,the operational transconductance amplifier used in this analog-to-digital converter achieves enough DC gain and unity-gain frequency under the low voltage supply and to guarantee the performance of the sample and hold circuit and the sub-stages.

同時利用增益增強(qiáng)技術(shù)設(shè)計高直流增益和高單位增益帶寬的運(yùn)放国产福利一区二区精品免费，從而保證采樣保持電路和子級電路的性能激情在线小说视频。

An embodiment of the invention discloses a reverse power control method of an orthogonal frequency-division multiple access system including: calculating decision threshold values of each adjacent subdistrict according to the current reverse traffic channel gain of an access terminal, channel differences between each adjacent subdistrict and the resources distributed by the access terminal; and adjusting the reverse traffic channel gain value of the access terminal according to the decision threshold values of each adjacent subdistrict and using the adjusted reverse traffic channel gain values to determine the transmit power of the reverse traffic channel.

本發(fā)明實(shí)施例公開了一種正交頻分復(fù)用多址系統(tǒng)中的反向功率控制方法，包括：根據(jù)接入終端的當(dāng)前反向業(yè)務(wù)信道增益欧美黄色二区、各個相鄰小區(qū)的信道差異以及接入終端所分配的資源情況計算各個相鄰小區(qū)的判決門限值大学超碰在线公开免费日韩大学；根據(jù)所述各個相鄰小區(qū)的判決門限值調(diào)整接入終端的反向業(yè)務(wù)信道增益值，并且利用所調(diào)整的反向業(yè)務(wù)信道增益值決定反向業(yè)務(wù)信道發(fā)射功率亚洲狼友视频网站。

By utilizing the unitary matrix, the transmitter decouples the input signal into spatial orthogonal beam directions with the matched filters in beam directions in the receiver, and the gain obtained by each data block can be equivalent to the sum of the projection from the channel matrix to the corresponding beam directions. Beam selection is adopted to maximize the minimum gains of all the blocks, which can improve the system diversity gain efficiently.

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With the support of a major research grant of Zhejiang Province (No. 001101027) and the Plan of Promoting Education of Excellence of Zhejiang University in the 21st Century, this dissertation is devoted to address the above problems and fabricate an L-band EDFA with low cost, high performance and technological innovation.First the mechanism of an erbium doped fiber amplifier is introduced. Various theoretical models based on classical rate propagation equations are summarized and compared for their applications. We use a modified numerical model based on the Giles model, which agrees with the experimental results well. This serves as the theoretical base for the whole thesis and will be used to optimize the characteristics of EDFAs. A novel method based on a map of noise figure and gain is proposed to analyze efficiently the dependence of the noise figure and gain for EDFAs on the EDF length and the pump power. The characteristics of various EDFAs are studied and compared.Secondly, some important parameters are introduced to describe the characteristics of EDFAs. The methods and the experimental setups for measuring the gain and noise figure of an EDFA are emphasized. We introduce how to measure the characteristics of each component of an EDFA, especially the gain and absorption coefficient of an erbium doped fiber.Thirdly, four types of simple and novel L-band EDFA structures with low noise, high gain and low gain ripple are proposed to satisfy the requirement of a DWDM system. They can be classified into two categories. In the first category, a single ASE pumping is served asa secondary pump. This category includes the following three types. Type: a new construction using a fiber Bragg grating in an unpumped EDF section at the input side. Type: a new structure of L-Band EDFA with two-stage pumps, which utilizes the forward ASE as a second pump.

本論文本著科技創(chuàng)新、服務(wù)于生產(chǎn)實(shí)踐的精神亚洲综合色色，以設(shè)計價格低廉狼友视频新网址，性能優(yōu)越、結(jié)構(gòu)合理簡單的L-band EDFA為目標(biāo)黄色视频大全一区，依托浙江省科技廳重大科學(xué)基金資助項(xiàng)目(001101027)和浙江大學(xué)振興教育計劃資助的全光網(wǎng)絡(luò)的搭建—《光通信技術(shù)》課程實(shí)驗(yàn)建設(shè)項(xiàng)目欧美视频一区二区三区，展開了如下工作：首先，介紹了摻鉺光纖放大器的工作原理亚洲网站视频，歸納總結(jié)了基于速率方程基礎(chǔ)的EDFA的各種理論模型www.麻豆精品，分析比較了各個模型的特點(diǎn)和適用場合，最終選擇完善的Giles理論模型作為本論文分析設(shè)計EDFA的理論基礎(chǔ)免费观看A级毛片在线网站；針對實(shí)際實(shí)驗(yàn)條件提出了修正的EDFA模型的數(shù)值計算方法自拍偷拍欧美；創(chuàng)新地提出了增益—噪聲系數(shù)全局分析法，直觀有效地分析了EDFA的增益和噪聲系數(shù)與摻鉺光纖長度和泵浦功率的依賴關(guān)系一级免费长视频，并對各種EDFA的性能作了全面的比較欧美系列黄片黑人黑屌；第二，介紹了摻鉺光纖放大器特性參數(shù)的定義與測量方法日韩一区二区精品久久，重點(diǎn)介紹了噪聲系數(shù)和增益系數(shù)的測量方法及實(shí)驗(yàn)裝置国内外激情视频网；介紹了組成摻鉺光纖放大器各組件的特性測量方法，重點(diǎn)介紹了測量摻鉺光纖參數(shù)的方法和實(shí)驗(yàn)裝置手机在线AⅤ片免费视频观看；第三久久精久久精久久精99，針對WDM系統(tǒng)對L-band EDFA譜平坦、低噪聲全免一级久久久久片、高增益的要求人人大香草av淘宝av线路一，我們創(chuàng)新地提出了四種不同的L-band EDFA結(jié)構(gòu)，按設(shè)計思路可以分為兩大類：一類是基于單抽運(yùn)二級泵浦法一级黄色夫妻生活a片在线免费观看，這一類包括在未泵浦摻鉺光纖的輸入端插入一根布拉格光纖光柵的兩段L-band的EDFA的新結(jié)構(gòu)亚洲免费一区在线；基于前向ASE光作為二級泵浦源推動下一級EDF工作的泵浦分配、兩段級聯(lián)L-band的EDFA的新結(jié)構(gòu)欧美夫妻生活；基于單根光纖光柵成年人免费看的视频大全、泵浦分配、兩段級聯(lián)的EDFAheisi.com；另一類則是基于同時應(yīng)用前后向C-band ASE作二級泵浦源的雙抽運(yùn)法，如基于前后向ASE光作為二級泵浦源的三段級聯(lián)L-band的EDFA的新結(jié)構(gòu)欧美图片亚州图片性爱图片自拍偷拍。