重發頻率 的英文怎麼說
中文拼音 [zhòngfābīnlǜ]
重發頻率
英文
recurrence frequency-
Due to existing signal processing technology ’ s shortage such aslow measurement, narrow measurement range precision and other poor performance, we introduced a high - precise signal processing technology : firstly, to get power spectrum with hanning windowed welch modified periodogram, search its peak value frequency ; secondly, to apply zooming analysis via goertzel algorithm ; at last, to get a highly precise doppler frequency with energy centrobaric rectifying algorithm 。 the simulating result indicated that this technology introduced could get accurate doppler frequency 。 depending on above discussed technology, we designed a signal processing scheme, and developed a signal processing system. the running result showed high performance, verified the feasibility and reliability of the highly precise signal processing technology introduced. in a word, the technology improved ldv ’ s performance such as measurement precision, measurement range, dynamic response time 。 and it will have a wide application foreground
針對存在的缺點，本文提出了一種應用於激光多普勒測速的高精度信號處理技術，即首先利用加hanning窗的welch修正周期圖演算法得到信號功率譜，搜索其譜峰值頻率，接著利用goertzel頻譜細化演算法對搜索的譜峰進行細化分析，再引入能量重心頻譜校正演算法對細化后的譜峰進行校正分析，從而將離散頻譜分析演算法、頻譜細化演算法和頻譜校正演算法三者有機結合起來，充分發揮各自的優點:通過加hanning窗的welch修正周期圖演算法快速得到功率譜及峰值頻率，通過goertzel演算法獲得分析頻帶的高解析度頻譜，然後通過能量重心校正演算法對細化后的頻譜進行高精度校正，這樣不僅保證了演算法的高效性，而且大大提高了分析的精度。If the numerical value line resonance frequency plus some shaft connatural frequency of generator is equal to operation frequency, it brings about coupling resonance between generator and system, which maybe results in shaft rupture of synchronous generators
當線路電氣諧振頻率與同步電機的軸系某一固有振蕩頻率近似互補于電網工頻時，將導致機電系統的耦合振蕩，嚴重的會造成同步發電機大軸的扭斷。With the developing trend of large size and large capacity, the turbine ' s natural frequencies are decrescent, maybe reaching the input forces " order of magnitude. so, it is becoming more and more important to analyze the stability of a turbine
隨著水輪機組朝著大尺寸、大容量的方向發展，其自身的固有頻率也隨之降低，與干擾激振力的頻率屬于同一數量級，因此，水輪機組運行的穩定性就變成更為重要的問題。The dissertion, after introducing physical geography situation and societal economic sitiuation of chongqing, has also analysed the basic feature of water resources in chongqing, at present the water resources utilization in chongqing is still in traditional phase. there are so many faults and shortcomings in water resources management system. the construction of water resources institutions and regulations is fallen behind. the supply of water resoures has not sufficiently satisfied the demand to water resources. the condition of water quality has not radically improved. soil losses is still serious. the incidence of flood and drought is very high. in accordance with present condition of water resources utilization in chongqing, the dissertion argues that it should strengthen people ' s understanding to water resources sustainable utilization for chongqing ; reform the present water rexources management system and have a try on water affairs management system in chongqing ; make effort to construction of water resources " institutions and regulations ; realize demand management, constuct save - water model society ; according to actual condition, strength water utilization constrution, then realize the balance between water resources supply and demand ; according to the idea of " control resources, conduct flow ", control water pollution, realize sanitary generation ; control soil losses and protect water enviroment ; construc t the system of flood control and diaster prevent
在對重慶市的自然地理情況和社會經濟情況作了介紹之後，還分析了重慶市水資源的基本特徵，目前重慶市的水資源利用還處在傳統的開發利用階段，水資源管理體制還存在許多弊端，水的法規制度建設也相對落後，水的供給還不能完全滿足需求，水質狀況沒有得到根本性的改善，水土流失還很嚴重，水旱災害發生的頻率比較高。針對重慶市水資源利用的現狀，本文提出：應加強對水資源持續利用的認識；改革目前重慶市的水管理體制，嘗試水務局管理體制，相應加強水的法規和制度建設，實現需水管理，建立節水型社會；根據實際情況，加強水利建設，實現水的供需平衡；依據「控源導流」的思想控制水污染，實現清潔生產；治理水土流失，保護水環境；建設防洪減災體系。A building of high, the breadth, long comparison is very important. house for combination in an ideal of big set, reruns hour then contain the best frequency to respond to the width. frequency response range in other words, the combination can broadcast tallest to can also fully develop to the lowest frequency, and the equilibrium degree is as well high, and halt a circumstance is very tiny. the first glint wave primary reflection mutual interference for with wave secondary reflection of many glints the degree is not to result in confusion. combination that fundermental the diapason wave harmonics is again perfect
大套組合在一間理想的房子里，重播時便有最佳的頻率響應寬度frequency response range 。換句話說，組合所能播放的最高至最低頻率也可以盡情發揮，平衡度亦高，駐波情況極微。第一反射音波primary reflection和多次反射音波secondary reflection的互相干擾情度不至造成混亂。Conclusions the frequency of clinically important valve regurgitation was significantly increased in patients taking pergolide or cabergoline, but not in patients taking non ? ergot - derived dopamine agonists, as compared with control subjects
結論：與對照組相比，服用培高利特或者卡麥角林的患者臨床上發生重要瓣膜返流的頻率顯著增加，但服用非麥角?生的多巴胺受體激動劑的患者瓣膜返流的發生率卻未增加。Results clinically important regurgitation ( moderate to severe, grade 3 to 4 ) in any valve was found with significantly greater frequency in patients taking pergolide ( 23. 4 % ) or cabergoline ( 28. 6 % ) but not in patients taking non ? ergot - derived dopamine agonists ( 0 % ), as compared with control subjects ( 5. 6 % )
結果：與對照組相比（ 5 . 6 % ） ，服用培高利特（ 23 . 4 % ）或者卡麥角林的患者（ 28 . 6 % ） ，臨床上發生重要的任何瓣膜的返流（中到重度， 3級到4級）的頻率顯著升高，而服用非麥角?生的多巴胺受體激動劑的患者（ 0 % ）瓣膜返流的發生率卻未增加。The main features of the apparatus are focus on small volume, light weight, no iron core, no magnetic saturation and no ferreous resonance, moreover, related advantages such as the large range of transient and frequency response, excellent electrical magnetic compatibility, oil - free configuration, reliable insulation structure, are all the trends of current transformer in the future. meanwhile, it should agree with the future power gauge and digital, computer, automatic relay protection. it will meet the demand of digital power network
它具有體積小、重量輕；無鐵芯、不存在磁飽和與鐵磁諧振問題；動態響應范圍大，頻率響應寬；抗電磁干擾性能強；無油化結構、絕緣可靠、價格低等優點；是未來電流互感器發展的方向，是新一代電力數字網發展的需要，適應電力計量和保護數字化、微機化和自動化發展的潮流。That is, if we want to assign frequencies to a pair of adjacent cities or radio stations, then the difference of those two frequencies used has to avoid the set t. the t - colorings of multigraphs is a more practical case of t - colorings of graphs where interference may occur on different level
頻率分配問題的圖論模型可以這樣得到：令收發信機為圖中的點，兩點之間有邊當且僅當這兩個收發信機干擾。重圖的t -染色是圖的t -染色的一個較為實用的部分，這是因為在研究頻率分配時，干擾可能會在不同的水平上發生。It is predicted that half of the alpine glaciers could disappear by the end of this century ; droughts and floods will occur more frequently in latin america ; vital crop yields will be reduced in many places ; malaria and dengue fever will spread in north america ; and climate changes in the polar regions will be the most extreme of the whole planet
至於歐洲方面，南歐大概會變得更易鬧旱災，其他地區的洪患發生頻率將有可能增加。到本世紀末，阿爾卑斯山的冰河可能會消失一半。拉丁美洲旱澇將更為頻繁，許多地區的重要作物產量或將減少。The conventional sphere model of earth and circle model of orbit are discarded, and the ellipsoid model and the ellipse model are selected for further research, which achieves a method to determine the target position through the antenna pointing direction. and the spaceborne sar system design and simulation software is brought forth. this software accomplishes sar system coefficients design for antenna area, pulse repetition frequency, signal bandwidth, downlink data rate, radar transmitter power and satellite platform yaw steering
本文從星載雷達的星地幾何關系入手，舍棄傳統星載合成孔徑雷達研究中的球地球模型和圓軌道模型，研究了在地球橢球模型和橢圓軌道模型下由雷達天線確定目標坐標的方法，並在此基礎上研製了星載合成孔徑雷達系統設計與模擬軟體，完成雷達系統天線尺寸、脈沖重復頻率、信號帶寬、雷達信號數據率、雷達發射功率、衛星平臺的偏航牽引等幾個方面的系統參數設計以及雷達多普勒特性、雷達系統模糊、雷達定位及精度的分析，最後完成雷達回波信號的模擬。The dissertation firstly discusses the reflectance of euv and soft x - ray in " multilayer system based on classical electrodynamics and optical characteristics of materials. the nns surface roughness in different spatial frequency range is carefully studied since scattering can seriously reduce the reflectance in euv and soft x - ray wavelength region. we discuss representative model of residual stress in
首先從材料在極紫外、軟x射線波段的光學特性出發，討論了極紫外、軟x射線在理想和非理想多層膜系中的反射特性；研究了影響極紫外、軟x射線多層膜反射率的表面粗糙度的空間頻率范圍；重點探討了多層膜殘余應力的典型模型、應力形成機制以及薄膜的形成過程。The efficient sppc had been performed with 1 - hz - repetition - rate 532nm nanosecond pulses, in which phase conjugate reflectivity as high as 21. 5 % was obtained. when sppc were operated in ce : batio3 with 532nm, 632. 8nm and 790nm cw lasers, the maximum sppc reflectivity of 54. 1 %, 88. 2 % and 80. 5 % were obtained, respectively. unlike the results reported before that four - wave mixing by stimulated photorefractive backscattering ( spb - fwm ) only exists at short wavelengths while four - wave mixing by total internal reflection ( tir - fwm ) only exists at long wavelengths, both of these two mechanisms coexist at all wavelengths from 532nm to 790nm in our experiments
通過大量的實驗全面研究了ce ： batio _ 3自泵浦位相共軛特性：在低重復頻率（ 1hz ） 、 532nm調q激光泵浦時最高獲得了21 . 5的位相共軛反射率，而此前報道過的建立位相共軛脈沖光最低重復頻率是10hz ；實驗中發現在532nm 790nm波長范圍內，在不同的波長激光泵浦時，同時存在兩種自泵浦位相共軛機制：全內反射?四波混頻（ tir - fwm ）和受激背向散射?四波混頻（ spb - fwm ） ；在連續激光泵浦時，對532nm 、 632 . 8nm和790nm三種波長，最高分別獲得了54 . 1 、 88 . 2和80 . 5的位相共軛反射率；同時還研究了自泵浦位相共軛光的時間穩定性。Compared with non - slung - load flight, additional aerodynamic load, gravity load should be considered in the slung - load system. so the moment to the gravity center, flight mode and the natural frequency will change
直升機吊掛飛行，與直升機非吊掛飛行狀態相比，增加了新的氣動載荷、重力載荷，和因此產生的對直升機重心的力矩，其飛行運動模式、低頻振蕩固有頻率均發生改變。The series genrating set combination of single and three phase brushless generator 、 control panel 、 common base produced by liuzhou jiali electric manufacturing co. ltd and engine produced by nanning machine factory ( abbreviation : nanji ) 、 changzhou engine co. ltd ( abbreviation : changfa ), which appears small size 、 light in weight 、 easy to start 、 low in fuel consumption and noise production with stale voltage and frequency output. it is an ideal power supply for banks 、 post office 、 public places of entertainment 、 households and pasturelands, so on
本系列機組由柳州佳力電力電工有限責任公司生產的單相無刷發電機、控制箱及公共底座與南寧機械廠（簡稱南機） 、常發集團（簡稱常發）等柴油機廠生產的柴油機組成，具有穩定的電壓和頻率輸出及體積小、重量輕、啟動方便、油耗低、噪音低等特點，充分地體現了高性能、高質量發電機所應具備的要素，是銀行、郵局、娛樂場所、家庭及牧場等的理想電源。Thirdly, a ladar transmitter with high repetition rate which uses pulsed laser diode is manufactured. the power characteristics, spectrum characteristics and temperature characteristics of the laser diode are discussed
研製了一種重復頻率高的脈沖半導體激光器激光雷達發射機，討論了半導體激光器的功率特性、光譜特性和溫度特性。Through utilizing the shift multiplication characteristics of m series, this kind of radar system eliminates the bad effect of doppler frequency. in theory, the doppler tolerance of the radar system can reach the half of the code rate with proposed echo pretreatment method in this paper
從理論上說，應用於該雷達系統的信號處理方法可以使得雷達系統的多普勒容限達到偽碼子碼重復頻率的一半，從而使偽碼調相雷達可以有效地發現高速目標。This paper ' s study is focused on the principle of bistatic sar on the basis of giving a brief introduction of sar principle, including azimuth resolution, mapping width, focusing deepness, pulse repetition frequency limitation and radar equation etc. then the paper studies the special form of bistatic sar with stationary transmitter
在簡要介紹了合成孔徑雷達的成像原理后，本文著重從原理方面對雙站sar進行了分析，討論雙站sar的方位向解析度，測繪帶寬，聚焦深度，脈沖重復頻率限制，雷達方程等問題，然後對發射機固定的雙站sar這種特殊的雙站sar模式進行分析。This has important significance on further developing compact, high power, high repetition rate pulsed co2 laser
這對進一步發展緊湊的高功率高重復頻率激光器有重要意義。The repetition pulse power supply not only has been used in accelerator, but also can be applied in other pulse power technology. such as environment protect fields
本重復頻率脈沖電源是為某加速器整機配套而研製的，但也可發掘其在其他脈沖放電領域如環保領域中中的應用。分享友人