等噪聲線 的英文怎麼說
中文拼音 [děngzàoshēngxiàn]
等噪聲線
英文
noise contour line-
Fluid noise mainly comes from out put pulsation of rate of flow, the main reason of out put pulsation of rate of flow is the instant high pressure return flow that obturation cubage produced when the big round curve pressure transition. the v trough on the port plate can reduce the fluid noise. in this paper, the author based on the acting of dam a river and condensability of liquid and used matlab language as tool to calculate the v trough on the original port plate and drew out the p - t diagrammatic curve and analyzed its shortcoming and improved the design of original v trough and got that the best size of its angle was 12. 3 and its length was 5mm and the cross section was an equilateral triangle
流體噪聲主要來源於輸出流量脈動，造成輸出流量脈動的主要原因是閉死容積在大圓弧段壓力切換時產生的瞬時高壓迴流，在配流盤上開設v型尖槽可降低因高壓迴流而引起的流體噪聲，本文以截流作用和液體的可壓縮性為理論依據，以matlab語言為工具，對原配流盤上的v型尖槽進行了理論計算，繪制出p - t圖線，分析了它的不足，並對原有v型尖槽進行了優化設計，得出了v型尖槽的最佳幾何尺寸：配流盤平面上的v型尖槽的兩邊的夾角為12 . 3 ，槽長5mm ，槽的橫截面為等邊三角形。Low noise amplifier ( lna ) is widely used in front end of a received set of mobile communication 、 wireless radio 、 blueteech technology and so on 。 the active device is the core of the circuit and has significant effects on the whole equipment, therefore, the design of the active device is vital in lna
微波低噪聲放大器（ lna ）廣泛應用於移動通訊、無線電、藍牙技術等的rf前端。 lna中的有源器件是整個電路的核心，對整個放大器電路的性能有著重要的影響，因此有源器件的設計是lna的關鍵技術之一。Firstly, the complex characteristics of the seal images caused in the process of producing conditions are analyzed. to solve these problems respectively, the circularity clusters and the ostu method are firstly used to realize the shape classification and threshold processing of different seal images. then the image denoise is performed well by scanning beam seed filling and labeling algorithm
論文中首先分析了印鑒圖像由於蓋印條件造成的圖像本身的一些復雜特點，提出了運用圓形度聚類和最大方差比演算法對圖像進行形狀分類和閾值處理，隨后利用掃描線種子填充演算法和貼刪標簽演算法進行噪聲的去除等預處理。In this paper, presents a new measuring method of the braiding angle of composites for the edge image with computer based on curve fitting theory. the method can suppress noise and absolve the problem of the point of edge is not continue
本文在邊緣圖像的基礎上，根據復合材料自身的特點，提出了一種基於曲線擬合的編織角的自動測量方法，該方法能夠有效地解決噪聲、邊緣點不連續等問題。For high stability of the system, with the realization of hardware of the system, the second part of this paper starts from the transmission line theory, and studies the signal integrity problem of high - speed circuit system in light current. the causes of these signal integrity problems, such as signal delay, reflection, crosstalk, ground bounce noises and etc. are analyzed in theory. combined with actual design, key points of design and standard design flow of general high - speed, high - precision printed circuit board are summarized, which has been applied in actual system, and good effect has been achieved
為使系統具有較高的穩定性，本文第二部分結合該處理器的硬體實現，從傳輸線理論出發，研究了弱電情況下高速電路印刷電路板中的信號完整性問題；從理論上分析了延遲、反射、串擾以及地彈噪聲等信號完整性問題產生的原因；結合實際設計，總結了一般高速、高精度印刷電路板的設計要點和標準設計流程，並在實際系統中獲得了應用，取得了很好的效果。( 4 ) applying measurement noise automatic weighting kalman filter to the guidance of line - guidance torpedo, we compromised target information and torpedo information, which in turn come from sonar of guidance station and inertial measurement units of torpedo
（ 4 ）將多傳感器量測噪聲自動加權卡爾曼濾波應用在線導魚雷制導中，融合來自製導站聲納測量到的目標信息和來自魚雷慣性測量組件的魚雷位置和姿態等信息進行了模擬研究。Great intermittent noise, wide variety of impendence along with the load and great attenuation of signals have restricted the further utilization of power line
但是，電力線通信通道存在間歇性噪聲大、阻抗隨負載變化大、信號衰減大等缺點，嚴重製約了它的有效利用。Transmitting noise is main interfereing source of switch power supply which is coupled through lines of power supply, singal, interlinkage and grouding
摘要傳導型噪聲是開關電源的主要騷擾源，它可以通過電源線、信號線、互連線、接地導體等進行耦舍。Then we introduce the character of the atmosphere channel, which we emphasized on the atmosphere scatter, absorption and scintillation ' s effect on the laser beam. in chapter, we explain why we used cassegrain telescope to collect the optical signal at first, then the lightsource, detector, front amplifier used in optical communication has been compared to that of fiber communication, the noise including shot noise, thermal noise and background light noise has been explained here for analysis the snr and ber in the next section
在第三章介紹無線光接入系統的光收發單元，採用多孔徑卡塞格倫式的收發天線對消除減小大氣湍流影響有較大作用，針對大氣通道的特點無線光系統收發單元在光源、光探測器、前置放大電路上存在許多有別于光纖通信的技術，同時還闡述了光接收機包括背景噪聲的噪聲機制和接收靈敏度、誤碼率等指標，最後給出了一個整個傳送鏈路的功率預算。On the basis of increasing the flaw resolution of the x - ray radiographic system, the study is firstly concerned with the analysis made on the influence of such factors as redial sources energy, system noise, optics radiography and scattering on the radiographic system in theory, and the present dissertation looks at the methods for acquiring the radiographic system point sp read function, line spread function and module transfer function ( mtf ). on the basis of these studies, research the spread properties of the tiny flaw making use of mtf, acquiring the properties of system inspecting sensitivity and resolution, based on the system optimization designing
本文以提高射線成像系統的疵病解析度為前提，首先在理論上對射線源能量、系統噪聲、光學成像、散射等各環節對成像系統的影響進行分析，探討成像系統的點擴展函數、線擴展函數及其調制傳遞函數（ moduletransferfunction ，簡稱mtf ）獲取方法，在此基礎上，利用mtf研究微小疵病的擴展特點，從而得到系統的檢測靈敏度和解析度給出關系特性，為系統優化設計提供依據。Three phase dry type power transformer, which make it with those features : safety, reliability, and energy saving, fireproof, flameproof, simple maintenance etc., the design is advanced ; the structure of products is reasonable and the outline is fine, the main performances of the products are much better than the national standards, for example, partial discharge level no - load loss, on - load loss, noise level, it is adaptable for application on heavy humidity and severely pollute places which are near to lake, sea and rive, as well as, high demand - fireproof, heavy load capacity place, such as : high building, airport, station, port, underground, hospital, electrical power station, metallurgy, shopping center, residential area and petroleum chemical industry, nuclear power station, nuclear - powered submarine
非包封線圈三相干式變壓器，具有安全可靠節能防火防爆維護簡單等優點。其設計先進結構合理外形美觀。主要性能指標均優于國內標準，如局放水平空載損耗負載損耗噪聲以及能適應高溫度環境使用等，可安裝在靠近湖海河邊污穢潮濕的環境及防火要求高負荷較大的地區，適用於高層建築機場車站碼頭地鐵醫院電廠冶金行業購物中心居民密集區以及石油化工核電站核潛艇等場所。The paper includes four sections followed here : the first section studies the modeling of signals of pulse doppler radar seeker, and establishes a radar signal simulation model, including radar emitting signal model, receiving signal model, receiving echo signal model, clutter model, noise model, sum channel directional pattern of antenna model, difference channel directional pattern of antenna model, sheltering model, rcs model, glint noise model, etc. the second section studies signal processing of pulse doppler radar seeker, and establishes radar signal processing mathematical model and data processing mathematical model for simulation, including windowing, doppler filtering, envelope demodulation, pdi, cfar, centering, velocity tracking, angle tracking, a - b filtering, etc. the third section studies the modeling of modified proportion guiding, and establishes guiding model, then dynamic simulation results is provided
論文的主要工作包括四部分：第一部分研究了脈沖多普勒雷達導引頭的信號建模問題，建立了雷達信號模型，主要包括：發射信號模型、接收信號模型、目標回波信號模型、雜波模型、噪聲模型、和差通道天線方向圖模型、遮擋因子模型、接收機噪聲模型、目標雷達截面積統計性模型、目標角閃爍模型等。第二部分研究了脈沖多普勒雷達導引頭的信號處理模式，建立了信號和數據處理模型，主要包括：加窗和多普勒濾波、包絡檢波、檢波后積累、頻域cfar處理、速度定心、速度跟蹤、角跟蹤、 ?濾波等，然後給出了信號處理流程。The clues and techniques to improve the resolution of data processing are 1 ) removing the affection of near surface factors on data acquisition, including static correction and noise eliminating technique etc, 2 ) broadening the frequency band of pre - stack seismic data, including amplitude compensation and pre - stack deconvolution etc, 3 ) improving s / n ratio of high frequency and weak reflection signals through multiple coverage with high precision velocity analysis, residual static correction and high - order nmo, raising " dead line of high frequency reflection ", and 4 ) identifying post stack effective reflection frequency band, enhancing dominant frequency and so on
主要包括：消除近地表因素對資料採集的影響，包括靜校正和噪音壓制技術等；疊前拓寬地震資料領帶，包括振幅補償和疊前反褶積技術等；藉助高精度速度分析、剩餘靜校正和高次項nmo技術，通過多次覆蓋疊加，消除資料中隨機噪聲干擾、提高資料信噪比，尤其是高頻端反射信息的信噪比，改善高頻反射和弱反射信號信噪比，提高「高頻反射死亡線」 ；疊後有限反射頗帶識別、抬高優勢頻率等。The research results are controlled source which has linear or nonlinear variabe frequency scan function and the seismic instruments which match with it, and the method of small group intervals, small offset, much more channels, short array length, high - frequency receivers are applied during the link of data acquisition, and that the techniques of the refraction static correction, the noise suppressing, the high - resolution velocity analysis, the wavelet length compression, the wavelet zero - phase, and the prestack migration should be applied emphasizedly during the link of data processing and interpretation
研究表明，對于城市活斷層的抗干擾高解析度淺層地震勘探，在數據採集環節應採用具有線性或非線性變頻掃描功能的可控震源和與其相匹配的地震儀器，以及小道間距、小偏移距、多接收道、短排列和高頻檢波器接收的工作方法；在數據處理與解釋環節，要重視折射靜校正技術、噪聲壓制技術、高精度速度分析技術、子波壓縮技術、子波零相位化技術和疊前偏移技術等的應用。In the following chapters, a 16 - channel experimental phased array ultrasonic testing system is thoroughly explained, including digital beam forming, low noise programmable amplification of received ultrasound signal, multi - channel hi - speed hi - precision data acquisition, hi - speed real - time processing of multi - channel ultrasound signal, and hi - speed data transfer based on pci bus. in addition, the frame of software system is built
本文詳細闡述了作者所獨立研製的16通道相控陣超聲檢測實驗系統，包括數字化超聲發射/接收波束形成、超聲信號的低噪聲程式控制放大、多通道高速高精度數據採集、多通道超聲信號高速實時處理、基於pci總線的高速數據傳輸等全部電路模塊的結構及工作原理，並說明了所編寫的底層軟體系統的框架。The linear darkness transform method is used to increase the contrastiveness of pictures ; the improved mid - value filtering algorithm and local average method are adopted to protect the edge as much as possible on the basis of noise elimination
採用線性灰度變換等方法對圖像進行增強，使圖像的對比度擴展。採用改進型中值濾波法和多圖像平均法，在去除了噪聲的基礎上盡可能的保護了邊緣。The system can resolve the noise and impedance on the power line and obviously improve the abilities of anti - disturbance and successful rate of communication. at the same time, the software realy method and arithmetic is also introduced to settle the problem of attenuation and increase the distance of carrier communication, it can satisfy the need of remote reading meter system
該系統有效地克服了電力線噪聲和阻抗變化等干擾因素，提高了抗干擾能力和通信成功率，同時提出軟體中繼的思想和演算法並加以實現，進一步抑制了線路衰減快的問題，使載波通信的距離增加，滿足了遠程抄表系統的要求。Transmition velocity relys on the style of encode and modulation essentially during modern data transmition for the quality of using line bandwidth and the immunity of code ties on them tightly. but it is important that the velocity of data transmition reaches its limitation in fact for the interface of environment and cross - talk. so for the improvement of transmition velocity, we must analyze the characteristics of noise signal and the model of line deeply and then take some useful measures to better the immunity of modulation wave
在現代通信的數據傳輸過程中，傳輸速率本質上是由傳輸的編碼方式和調制方式決定的，因為編碼方式和調制方式直接決定了線路頻帶利用率和碼元抗干擾能力的好壞，因而直接決定了傳輸速率；但是在實際應用過程中，數據傳輸速率是不可能達到理想狀況的，因為環境干擾、串音干擾等因素的存在使得線路的頻帶不可能被完全利用起來；因此，必須認真分析線路的噪聲信號的特性以及噪聲線路的模型，以便在編碼方式和調制方式中針對性的做一些改進措施以改善調制波形的抗干擾能力，使得傳輸速率能夠進一步提高。Although adsl comes with new digital processing, coding, modulation and error correction technologies, it is also faced with various challenges out of subscriber lines, such as background noise, impulse noise, insertion loss, cross talk, wire size variations, bridge tap, line joints and line insulation, etc. all those factors tend to produce adverse impacts on the performance of high - speed transmission services. firstly, the insertion loss of copper lines increases in proportion to the length of lines
雖然adsl採用先進的數字信號處理技術、編碼調制技術和糾錯技術，但是在推廣adsl業務時，用戶線路的許多特性，包括線路上的背景噪聲、脈沖噪聲、線路的插入損耗、線路間的串擾、線徑的變化、線路的橋接抽頭、線路接頭和線路絕緣等因素將影響高速率傳輸業務的性能。As the first stage of the system, its gain, noise figure ( nf ) and linearity directly take effect on the whole circuit
由於是整個電路系統的第一級，因此其增益，噪聲，線性度等直接影響整個電路系統的性能。分享友人