vector shift 中文意思是什麼
vector shift
解釋
矢量偏移-
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。 -
We propose an algorithm, which integrate the shift invariance of redundant discrete wavelet transformation ( rdwt ) and the flexibility of multi - resolution motion estimation, to overcome the shift variance of dwt and get the precise motion vector. under the different code parameter, we take the proposed algorithm compared to several present algorithms, and experiment results have shown that proposed algorithm could leave less energy in the residual frames, get more precise motion vector and better reconstructed frames
文章最後在不同的編碼參數下，將所提演算法與兩種傳統小波域運動估計演算法作比較，根據實驗所得數據分析，發現所提演算法在性能上要優于另外幾種演算法，具體體現在運動估計后所得殘差幀能量更小，重構幀客觀與主觀質量更高。 -
A new e. coli promoter - probe vector phn1005 was constructed by using a red - shift enhanced gfpmut3 as reporter gene and showed the following characters : 1, bamhi at the 5 " end of gfpmut3 structure gene could be used to clone promoter - active fragment and the strength of promoter could be quantitatively assayed. 2, a rrnbtlt2 terminator from rrna gene at the 3 " end of gfpmut3 could permit clone strong promoter. 3, another rrnbt1t2 terminator was inserted upstream bamhi to prevent reading through of promoters from puc19
進一步以紅移且熒光強度提高21倍的gfpmut3為報告基因，構建了大腸桿菌啟動子探針載體phn1005 ，該載體上gfpmut3結構基因5 』端的bamhi位點可用來克隆具有啟動子活性的dna片段並定量分析插入的啟動子強度；其3 』端含rrnat1t2終止子，可允許克隆強啟動子；在bamhi上游同樣插入rrnat1t2終止子以防止載體puc19上的啟動子的轉錄通讀； gfpmut3結構基因上游還插入一段內含子序列使正反六種讀碼框的翻譯均可被終止，可保證gfpmut3以正確的讀碼框翻譯。 -
Firstly, this paper introduces the asynchronous motor model, and compares it with the dc motor ’ s. then the paper studies the principle of vector control, and proposes an improved current model of rotor flux observer. this paper also studies the three - level inverter ’ s topology, working principle, the neutral - potential unbalance mechanism and its controlling strategy. the paper especially studies the svpwm in details. the interface between the vector control and the three - level inverter is studied in details, including the generation of reference voltage vector, its judging of the sector and triangular regions, and the working mechanism after it sent into three - level inverter. when synthesizing the reference voltage vector, select the vector which only includes p and o states as the starting vector, thus eliminate the vector shift problem when sector changes. this paper fully takes advantages of the powerful functions of matlab / simulink to set up the simulation model. this construction is very explicit. the simulation results verify the inverter voltage output is correct, the rotor flux is steady, the asynchronous motor ’ s dynamic and steady state performances and speed modulation are excellent
本文首先介紹了異步電機的數學模型，在此基礎上將異步電機的數學模型與直流電機的數學模型進行了比較;然後介紹了矢量控制的基本原理，採用了一種改進的轉子磁鏈電流型觀測模型;對三電平逆變器的電路拓撲、工作原理、中點電位不平衡的機理及控制方法進行了介紹，詳細分析了空間矢量脈寬調制策略。本文對異步電機的矢量控制與三電平逆變器之間的介面進行了詳細的研究，包括:參考電壓矢量的形成、所落扇區與具體小三角形區域的判斷、送入逆變器之後的工作機理。在參考電壓矢量的合成時，選擇只包含p 、 o狀態的空間電壓矢量作為起始矢量，解決了扇區切換時的矢量突變問題。 -
The vector relation among voltage, current and magnetic potential in phase shift regulating auto - transformer are analyzed. the parameter algebraic relation and the winding magnetic potential relation are gained
摘要分析了自耦調壓移相變壓器的電壓、電流、磁勢相量的關系，得到了各參數間的代數關系及各繞組的磁勢平衡關系。 -
Particular study of mean shift algorithm leads to an improvement of it : we change the bandwidth parameter h from a scalar to a vector
通過對mean - shift跟蹤演算法的詳細分析，提出了將原演算法中單一的帶寬參數改為矢量參數的改進方案。
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