脈動比率 的英文怎麼說
中文拼音 [màidòngbǐlǜ]
脈動比率
英文
pulsatory ratio- 脈 : 脈名詞1. (動脈和靜脈的統稱) arteries and veins2. (脈搏的簡稱) pulse 3. (像血管的組織; 連貫成系統的東西) vein
- 比 : Ⅰ動詞1 (比較; 較量高下、 長短、距離、好壞等) compare; compete; contrast; match; emulate 2 (比...
- 率 : 率名詞(比值) rate; ratio; proportion
- 脈動 : [物理學] [天文學] pulsation; pulsing; pulse; ripple; impulsive motion; pulsating; panting; loping...
- 比率 : ratio; proportion; rate比率計 ratio meter
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Leave sensor probe in place until oximeter reaches constant value and pulse display reaches full strength during each cardiac cycle. read spo2 on digital display
打開電源,接通血氧儀。觀察脈搏波形/強度和嘟嘟聲。對比血氧儀脈率與病人橈動脈搏動。The purpose of this study was to compare the 2 years ' efficiency of uterine artery embolization ( uae ) with hysterectomy in the treatment of menorrhagia caused by uterine fibroids in a randomized controlled trial
目的:本次研究的目的是通過隨機對照實驗比較子宮動脈栓塞( uae )及子宮切除在治療由子宮肌瘤引起的月經過多的2年有效率的高低。Compared with existing modulating method, torque ripple is greatly reduced by uniform modulating in one monocycle, increasing current slope of upcoming conducting phase instantaneously suppresses the torque ripple by 30 ’ during low speed with obviously lower initiating noise
採用單周期內各功率管均衡調制的方式,不僅消除了反向電流,而且與其他調制方式相比,可使轉矩脈動較小。After controlling for age and gender, the team found associations between a smaller ratio of retinal arterioles and venules with mri findings, including prevalent infarcts, worsening white matter grade, and incident infarct
在對年齡和性別進行控制后,研究小組在磁共振結果中發現較小比率視網膜小動脈和小靜脈之間的聯系,包括普遍的梗塞,惡化的白質程度,以及偶發的梗塞。Backed up by the soplat theory based on particle kinematics, the second chapter of this paper presents with analysis and simulation of several single observer passive measurement models, which uses such relative movement parameters as bearings changing rates and centrifugal acceleration information on the basis of bearings measurements. in the third chapter, the observability of location respectively using bearings and its changing rates information and centrifugal acceleration information is analyzed, and its observable condition is got. the fourth chapter puts forward the modified covariance extended kalman filtering ( mvekf ) against the defect of traditional extended kalman filtering ( ekf ), whose performance is simultaneously compared in the chapter with the performance of ususal tracking algorithm such as ekf, mgekf, iekf by computer simulation
在近年來提出的基於質點運動學原理的單站無源定位理論基礎上,本文第二章提出了幾種在角度測量的基礎上增加角度變化率及相對運動的離心加速度等運動學參數的單站無源測量模型,並對它們進行了分析和模擬;第三章分別對利用角度及其變化率信息定位和利用離心加速度信息定位的可觀測性進行分析並得到了相應的可觀測條件;第四章針對傳統擴展卡爾曼( ekf )方法的缺點,提出了一種修正協方差的擴展卡爾曼濾波( mvefk )方法,並將其和ekf 、 mgekf 、 iekf等常用的單站無源定位濾波方法進行了性能模擬比較;第五章通過引入雷達機動目標跟蹤方法和模型,提出了利用角度及其變化率對機動輻射源跟蹤的多級噪聲自適應方法和imm方法;第六章主要對角度變化率和離心加速度參數的獲取技術進行了研究,提出了幾種高精度測量脈沖序列多普勒頻率變化率的方法。The researchful results indicate that the flux pulse ration of ordinary helical gear pump without clearance is less than that of the gear pump with clearence under the condition that the main parameters are same, and the flux pulse ration of ordinary helical gear pump is less than that of whole profile meshing helical gear pump
研究結果表明:在主要參數相同的情況下,普通斜齒齒輪泵無側隙時流量脈動率小於有側隙時的流量脈動率;全齒廓嚙合斜齒輪泵比普通斜齒輪泵的流量脈動略小。The study has completed the design of two - phase inverter and made up of the two - phase inverter - motor system for experimental use it is a variable frequency adjustable speed system with a open - loop control of rotational speed, which consists of voltage - controlled oscillator circulating assign device inverter circuit and two - phase induction motor a accurate mathematical model is set based on the whole system, and simulator program of dynamic and steady condition is established, which is used to calculate the dynamic and steady performance by kron and symmetrical coordinate converter by simulator calculation and experimental research with specific parameter of the system, a comparison is made between predicted and experimental characteristics, experimental measurements are shown to compare closely with corresponding theoretical result it is compared with some variable frequency adjus table speed system comprising inverter and single - phase induction motor from the system efficiency torque pulsation and the effect of two - phase inverter capacitance based on the conclusion, harmonic cancellation pulse width modulation control of a two - phase inverter - fed induction - motor drive system is researched, which cancelled the low harmonic and improve the system performance
通過對電機的kron變換和對稱分量變換,建立了系統較精確的數學模型,編制了系統動態及穩態運行的模擬計算程序分別計算系統的動態和穩態性能。通過對系統的具體參數進行了模擬運算和實驗研究,實驗和模擬結果進行比較,說明實驗和理論較為一致,並從系統效率、轉矩脈動及兩相逆變器電容的影響等方面與各種逆變器和單相異步電動機組成的變頻調速系統加以比較。在此基礎上,對兩相逆變器供電-異步電動機系統使用諧波抑制pwm控制進行了研究,由於減少了低次諧波,改善了系統性能。On the basis of theory analysis, the average transmitted light intensity ( correspond to dc value ) was determined as characteristic parameter of raw water using photoelectric method for monitoring the fluctuation of transmitted light and photometric dispersion analyzer ( pda ). the dc value was closely related to both particle concentration and surface area of sand clay simultaneously. the experimental results shows that there is an exponential function relation between dc and surface area of sand clay in unit volume water ( sp ) : dc = asbp in which a and b are empirical coefficients. then the formula of macromolecule flocculant dosage is found to be d = f ( dc ) = e ( dc ) f in which e and / are empirical coefficients and the average correlation coefficient equal to 0. 981. so the model of automatical control system of water treatment plant was established using the formula
應用透光率脈動檢測技術和光散射顆粒粒度分析儀( pda ) ,通過理論分析,將pda的輸出信號之一? ?平均透光強度(對應于dc值)作為原水的特性表徵參數, dc值可以同時反映顆粒濃度和比表面積因素的影響,試驗結果證明, dc值與單位體積水中泥沙顆粒總表面積s _ p之間具有很好的冪函數關系: dc = cs _ p ~ d ,式中c 、 d為經驗系數,進而得到了以dc值為參數的高分子絮凝劑投藥量公式: d = f ( dc ) = e ( dc ) ~ f ,式中: e 、 f為經驗系數,平均相關系數達0 . 981 ,利用所建立的公式,建立了前饋? ?后饋聯合控制的在線自動投藥模型。A comparison of the flows with different gate - opening rates shows the causes that opening the gate at a higher rate is favorable to the reduction of cavitation, gate vibration as well as the gate load fluctuation. in addition, a study has been made to show the influence of the high - speed jet flow coming downward from the narrow gate gap on the flow condition in the tunnel downstream to the gate
通過分析比較不同閥門開啟速率對流動特性的影響,闡明了快速開啟閥門不僅有利於減少空化空蝕也有利於減小弧門振動和啟門力的脈動,此外,研究了門楣處狹窄縫隙高速射流對門后流態、壓力脈動和弧門受力等方面的影響。( 4 ) the influence of pulsation frequency on the drying process two special cases, in which the selected pulsation frequencies were 0 h /, and 83 h / respectively, were simulated and their simulation results indicated that the pulsating frequency of gas stream could improve the intensities of the heat and mass transfer during a pulse combustion spray drying process
( 4 )揭示了氣流脈動對乾燥過程的影響本文模擬脈動頻率為83hz的脈動氣流和非脈動氣流的兩種乾燥過程,比較兩種乾燥過程的顆粒蒸發速率和濕含量變化。模擬結果表明氣流脈動對噴霧乾燥過程有一定增強作用。In chapter 3, the pressure pulse under the two situations of the system with and without damper is discussed at the basic of analyzing the flow rate pulse. then the conclusion that the system has filtering effect is drew after adding a damper in it, but its serious in power wastage because of adding a damper
第三章,在分析液壓泵流量脈動的基礎上,討論並對比了系統加與不加阻尼兩種情況下各自的壓力脈動,得出系統中加一個阻尼后,具有一定的濾波作用,但是當流量較大時,由於阻尼的存在,系統功率損失比較嚴重。The goal of this paper is, by serial / parallel combination technique of two - transistos forward converters ( ttfcs ), to keep the merits of the ttfc, and to overcome the shortages of it. the interleaving technique is adopted, while in combining ttfcs. the interleaving technique lowers the net ripple amplitude and raises the effective ripple frequency of the overall converter without increasing switching losses or device stresses
組合式雙管正激變換器由雙管正激變換器串並聯構成,應用交錯控制策略,在保留雙管正激變換器功率開關管電壓應力低和可靠性高的優點同時,克服了等效占空比小、副邊二極體電壓應力高、輸出電流脈動大等缺點。The interleaving two - transistor forward converter succeeds to the advantages of the two - transistor forward converter, it has two units working alternately, the power loss of the converter is distributed and the output voltage ripple frequency is twice of the switching frequency
交錯並聯結構式的雙管正激變換器,繼承了雙管正激變換器的優點,兩個並聯單元互補工作,分擔了功率損耗,等效占空比擴大了一倍,輸出電壓的脈動頻率變為功率管開關頻率的兩倍。According to the fluctuating property of wind, on the stochastic vibration finite element theory, some calculation formulas of the response, including the along - wind response and the across - wind response, are obtained, the ideology of the torsion vibration in the double - tower structure and the ideology of the double - tower structure ' s dynamical wind load are also put forward at the same time. by using the stochastic vibration module of the general finite element program, the paper analyses the performance of the wind resistance more deeply and fully, discussing the influence on the double - tower structure from the diversification of the different component. the variance law of dynamic displacement and wind - induced vibration coefficient is derived through analyzing structure stochastic vibration, so is the effect of several parameters on dynamic displacement, acceleration and wind - induced vibration coefficient
從結構風振的基本理論出發,通過對脈動風功率譜的分析,推導了結構風振響應(順、橫風向)的計算公式,同時提出了雙塔結構的扭轉振動和動力風荷載計算的思想,在結合通用有限元程序的隨機振動模塊的情況下,對雙塔結構的抗風性能作了深入、全面研究,探討了雙塔結構構件截面的變化對其抗風性能的影響,同時探討了順風向風速譜的選取、風速、參與計算的振型數、風與結構耦合作用是否考慮等因素對分析結果的影響,比較了規范風振系數的計算與隨機演算法結構的異同,並討論了原因,得出一些有意義的結論。Depending on the power spectrum compare of simulated fluctuating wind pressures based on the quasi - static assumption and measured fluctuating wind pressures, the practicability of quasi - static assumption in fluctuating wind pressures computing on similar structure surfaces are also discussed
在此基礎上,通過比較由試驗得出的和準定常假設下的脈動風壓功率譜曲線,論述了準定常假設不適用於大跨異型結構表面脈動風壓計算。Thirdly, this dissertation analyses the echo simulation of chirp - subpulse stepped frequency signal and chirp signal. and the detection capability of chirp - subpulse stepped frequency signal and chirp signal in low altitude moving target is compared. the results show that chirp - subpulse stepped frequency is better
再次,本文分析了chirp子脈沖頻率步進信號和chirp信號的回波模擬問題,在此基礎上,對chirp子脈沖頻率步進信號和chirp信號對低空動目標檢測的性能進行了比較,結果顯示chirp子脈沖頻率步進信號具有較好的性能。The heat flux level at which the two - phase flow instabilities onset was always decreased under rolling condition. the decreasing aptitude is about 2 % - 48 % of the normal level
搖擺工況下的脈動起始點功率值與不搖擺工況的脈動起始點功率值相比降低了2 48 ,搖擺使系統的穩定性下降。The factors, especially the interval, that affect the statistic mean wind velocity are expatiated. then the effects on the power spectrum of pulsating wind pressure as well as on the dynamic response of the structure under wind loads are analyzed by means of monte carlo method when the square item of pulsating wind velocity is ignored
在分析了平均時距對統計平均風速影響的基礎上,進而以結構的可靠度為指標利用montecarlo方法分析了當平均時距比較大時,脈動風速平方項對脈動風壓功率譜的影響。There appears to be a higher prevalence of coronary spasm in patients with acute coronary syndrome ( 20 % to 38 % ) than in those with stable angina ( < 6 % )
在急性冠狀動脈癥候群的病人(二十到三十八個百分比)比穩定性心絞痛的病人(小於六個百分比)有較高比率會有冠狀動脈血管痙孿。Enough measurement and comparison experiments of the whole system obtain satisfied results. the experiment results of sine and tremor signals under two acquisition frequencies are presented in the thesis
通過對整機系統進行的大量測試和對比試驗,得到了滿意的結果,論文給出了兩種采樣頻率下針對正弦信號和脈動信號的試驗結果。分享友人