逆脈 的英文怎麼說
中文拼音 [nìmài]
逆脈
英文
paradoxical pulse-
While in diastole, there were ( 1 ) antegrade in the transverse aorta, and retrograde in the ascending aorta and descending aorta ( below fda ), and ( 2 ) left - to - right shunt in the fda
結果發現：在收縮期時，在升、降主動脈是順向（前進）血流，在橫主動脈是逆向血流，在動脈導管是右至左分流。A circuit topology of the inverter with duty cycle extended active clamp forward style high frequency pulse dc link is adopted by each independent inverter. each inverter is cascaded by a circuit with duty cycle extended active clamp forward style high frequency pulse dc link and a dc / ac inverting bridge. the control strategy of voltage mode pwm forwardback is adopted by the former, and the control strategy of three - state discrete pulse modulation ( dpm ) hystersis current is adopted by the later
每個獨立的航空靜止變流器採用占空比擴展有源箝位正激式高頻脈沖直流環節電路拓撲，由占空比擴展有源箝位正激式高頻脈沖直流環節電路與dc ac逆變橋級聯而成，前級採用電壓型pwm前饋控制技術，后級採用三態dpm電流滯環控制技術。Digital pwm techniques for sine inverter power
正弦逆變電源的數字脈寬調制技術The algorithm of svpwm that is adopted by the system implements motor speed - regulation by control of magnitude and phase of motor flux. it can generate less harmonics in the output current of power inverter and less losses of ac motor, reduce pulsant component in output torque and raise availability of dc supply voltage
系統採用的svpwm演算法通過對空間磁鏈矢量幅值和相位的控制來調節電機轉速，減少了逆變器輸出電流的諧波，降低了脈動轉矩，提高了電壓的利用率。Results : 15 cases of patients were diagnosed as primary ureteral carcinoma by b - ultrasonography, intravenous pyelogram ( ivp ), cystoscopy and retrograde urography, ct, mri, ureteroscopy before operation. all of the patients were proved to be transitional cell carcinoma by pathological examination after operation
結果：術前15例患者經b超、靜脈腎盂造影、膀胱鏡及逆行腎盂輸尿管造影、輸尿管鏡等檢查診斷為原發性檢尿管癌。Use of reversed first dorsal metacarpal artery island fascial flap in repair of volar skin defect of index finger
第一掌背動脈逆行島狀筋膜瓣修復示指掌側皮膚缺損1 m 0. 5, the phase - shifted angle 6 is controlled in term of sine law which makes the magnitude of resonant voltage track a reference sine voltage, and the resonant voltage is rectified, filtered, inverted and then the better sine - voltage output is obtained, theoretical analysis and experimental results show that for the resistive load and inductive load, the switches of leading leg of the phase - shift - controlled circuit are always turned on at zvs, and ones of lagging leg are turned on at zvs ( < 0 ) or turned off at zcs ( ( > 0 ), moreover, all switches in the low - frequency inverter are always turned on and off at zvs, the measured circuit efficiency for rated load reaches up to 88 %
從功率單向流動角度出發，提出了一種lcc諧振型恆頻移相單相高頻鏈逆變電路拓撲，在調制系數0 . 1 m 0 . 5情況下，控制移相角按正弦規律變化，使諧振電壓脈沖列的幅值追蹤參考正弦電壓信號，經過整流、濾波、低頻逆變，從而獲得正弦度較好的輸出電壓。理論分析和實驗結果證明對于阻性負載或阻感性負載，移相全橋具有超前橋臂零電壓開通，滯后橋臂或者零電壓開通（ _ 0 ）或者零電流關斷（ _ 0 ）的軟開關特性，而低頻逆變器的各個開關均實現零電壓條件下的開通與關斷。High - frequency link power converters are receiving increasing attention. when the input frequency of ac - ac converter is quite high, such as 20khz or above, in order to make sure the converter switching action is restricted to the zero crossing point of the link voltage, the switching cycle becomes discrete pulse spectrums, however, the conventional pwm converters are ruled out because they would fail either to the efficiency or the low - distortion criteria
當交-交變頻器的輸入頻率非常高，通常為20khz時，為了在零電壓條件下實現逆變器開關管的通斷，變換器的開關時刻必須選擇在高頻交流電壓脈沖為零時，這意味著變換器開關時刻在時間軸上成為不連續的點，而常規的硬開關pwm變換器是將開關時刻選擇在任意時刻。The electrochemical study showed that the interaction mode is mainly intercalative binding in ph 7. 4 phosphate buffer solution. the uv - vis spectroscopic study further demonstrated the above results. through the electrochemical parameters such as charge transfer coefficient and standard electron transfer rate constant ks in the absence and presence dna, it was found that the reaction of aloe - emodin with dna forms an electrochemical active supramolecular complex
本文對姜黃素的研究結果表明，在0 . 1m磷酸鹽緩沖液（ ph3 . 0 ）中，姜黃素于玻碳電極上存在可逆的單電子轉移過程，據此，本文建立了以差示脈沖伏安掃描法檢測姜黃素含量的新方法。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 aspect of experiment, the investigation has been carried out from simple to complicated, i. e. started from the single pulse and double pulses test of phase module, and then to consecutive - pulse chop test, and then to three phase inverting test
在試驗研究上，採用了由簡到繁，由易到難的策略，從相構件模塊的單、雙脈沖開關試驗入手，經過模塊的連續脈沖斬波試驗，再到三相逆變試驗。( 2 ) using both upper and lower limbs of a fresh adult cadaver, inject red gelatin into femoral, forward and backward injecting the blue gelatin with high pressure into femoral vein with formalin preventing rot
（ 2 ）採用新鮮成人屍體上、下肢標本，于股動脈灌注紅色乳膠，足背靜脈網順、逆行及股靜脈加壓灌注藍色乳膠，福爾馬林溶液防腐。( 3 ) left lower limb was used to prepare artery ( red ) and vein ( blue ) color cast specimens using perchloroethylene. ( 4 ) deep freezed right lower limb sample, injecting red gelatin into femoral artery, forward and backward injecting blue latex with barium sulfate into femoral vein and great saphenous vein, cuting flap after dealing with formalin and get x - ray photos
（ 3 ）採用1例新鮮屍體左下肢標本制備過氯乙烯動（紅） 、靜（藍）脈分色鑄型標本。 （ 4 ）右下肢冷藏標本，于股動脈灌注紅色乳膠，再於股靜脈及大隱靜脈順、逆行灌注含硫酸鋇混懸液之藍色乳膠，福爾馬林防腐，然後切取皮瓣，攝取x線片。In this paper what is mainly discussed is the hardware implementation of the two application specific information processing modules by cpld or fpga, which are s + p inverse transformation, the inverse transform module of an image compressing system, and 4096 - point complex fft / ifft module, the central module of the digital pulse compressing system
本文討論的就是應用cpld fpga來實現兩個專用信息處理模塊的設計。它們分別是圖象壓縮系統的圖象反變換模塊? s + p逆變換模塊及數字脈沖壓縮系統的核心模塊? 4096點fft變換模塊。Combining high voltage new technology and power electronics technology, this paper developed a controllable steep pulse generator ( cspg ) that can control the energy of output pulse accurately. applied with this generator, a lot of cell experiments and animal experiments were carried out. based on these works, it ' s easier to research mechanism of irreversible electrical breakdown ( ireb ) of malignant tumor cell under steep pulse, and it may be helpful to generalize energy controllable steep pulse therapy ( ecspt ) on cancer treatment
為了研究能量可控陡脈沖對惡性腫瘤細胞不可逆性電擊穿的機理，並將能量可控陡脈沖療法應用於惡性腫瘤的臨床治療，本論文研製出了一套能對輸出陡脈沖的能量進行精確控制的陡脈沖發生裝置，並應用該裝置進行了大量的醫學細胞實驗和動物實驗。There are five parts are as follows : in part one, the concept of switching function is introduced first to establish the nonlinear mathematical model of the induction motor variable frequency speed adjustment system which is fed by a sine pulse width modulated ( spwm ) inverter and takes the effect of the main magnetic circuit saturation into consideration, then the low frequency oscillation of the system is simulated according to the model. next, from the view point of energy conversion of the inverter - induction system, a criterion for the low frequency oscillation is proposed to determine whether the system is in low frequency oscillation which is judged by whether the interval of the negative current component of the inverter input current is more than 1 / fc ( fc is the carrier wave frequency of the inverter ) or not
首先引入開關函數概念，建立了正弦脈寬調制（ spwm ）逆變器供電異步電動機，考慮主磁路飽和時的變頻調速系統整體數學模型，模擬系統的低頻振蕩；其次從逆變器-異步電動機系統能量轉換角度出發，提出通過檢測逆變器輸入電流中負電流的間隔時間是否大於1 / f _ c （ f _ c為逆變器載波頻率）來判定系統是否出現低頻振蕩；最後的實驗結果驗證了系統低頻振蕩建模和判據的實用性和正確性。A wavelet method for the simulation of a stochastic wind field
利用小波逆變換模擬隨機風場的脈動風The mountains will bloom with fire, by and by, but very soon, before the winter snows melt and the orcas go back to the open sea
山脈會帶著火而爆發，接著，很快地，在冬天的雪融化之前，逆戟鯨回到了公海上。Due to the complexity of the structure and control of cycloconverter - type three - phase hf link inverter for soft - switching based on phase - shift - controlled full - bridge mode, a simple and optimized vvvf control strategy is proposed. this control strategy includes : produced pwm by space voltage vector ( svm ) and equivalent carrier frequency fe = 1 / te are introduced into the pdm control of the cycloconverter ; softened equivalent pwm wave is generated at the notches of hf voltage pulses ; the harmonious control between regulating pulse width by phase - shifted angle and regulating voltage of equivalent pwm is to minimize the harmonics content of output voltage of the inverter
西安理工大學博士學位論文針對這種前級移相全橋軟開關周波變流型三相高頻鏈逆變器結構和控制的復雜性，提出了一種實現簡單而整體優化的vvvf控制策略:將空間電壓矢量產生p姍的方法svm和等效載波頻率fe = 1 / te引入到周波變流器的pdm控制;按高頻電壓脈沖前後沿軟化等效p翎波;用移相調節高頻脈沖寬度和等效p姍調壓協調控制逆變器輸出電壓，在滿足輸出電壓條件下使諧波最小。The variable polarity power supply circuit uses two stages full - bridge inverter, the former inverter is regarded as a constant - current source with fast dynamic response, and supplys energy for the second one, and the latter one is to produce variable polarity current excellently, and low - frequency pulse current by variable polarity power supply is used to reduce input energy and control the shape of weld bead while welding. a series of high - frequency pulse current is superposed on direct - current - electrode - negative ( dcen ) current through the high - frequency pulse power supply, which is used to compress the arc and improve process of crystallization
其中變極性電源採用二次全橋逆變結構，一次逆變提供快速的響應速率並給二次逆變提供能量，二次逆變提供良好的變極性性能，使輸出能量最優化，並用其低頻電流特性減小電弧線能量，控制焊縫成形;高頻脈沖電源提供的高頻電流疊加在反極性電流dcen上，利用電流的高頻特性壓縮電弧，改善焊縫金屬結晶過程。分享友人