study of pulse condition 中文意思是什麼
study of pulse condition
解釋
脈象研究-
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。 -
In this thesis, we study the thz pulse generation efficiency of the < 110 > - oriented zn1 - xcdxte crystals with various composition ratios and doping levels, using thz time - domain spectroscopy. it is found that both absorption and phase matching condition play important role. it is the first time to systematically study < 110 > - oriented zn1 - xcdxte crystals with various composition ratios and different doping levels using thz time - domain spectroscopy
本論文中，我們利用thz時域光譜系統對不同組分、不同摻雜的zn _ （ 1 - x ） cd _ xte < 110 >單晶（ x = 0 0 . 25 ）作為thz輻射材料的性能和光譜響應進行了研究，發現晶體對thz輻射的吸收和晶體的相位匹配是影響晶體產生thz輻射效率的重要因素。 -
A study of the shaping of signal pulse under the condition of a synchronous pulse pump
同步脈沖泵浦下信號脈沖整形的研究 -
The study of popular media embodies the understanding of survival condition of modem people and observation of cultural pulse. the article tries to probe into the nature of contemporary popular media, cultural value and aesthetical significance through cultural levels. critical angle and analysis of the media criticism theory and the four media of newspapers, broadcast, tv and internet. the article also ponders over the media problems appeared under the present cultural situation
本文試從文化的層面、批評的角度，通過對媒介批評理論的梳理，以及對報紙、廣播、電視、網際網路等四大媒介的剖析，來探詢當代大眾傳媒的本質屬性、文化價值和美學意義；並對當前特定文化語境下日漸凸顯的傳媒問題作一些思考。
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