two-dimensional spectrum 中文意思是什麼

two-dimensional spectrum 解釋
二維譜
  • two : n. （pl. twos）1. 兩人；兩個東西，一對。2. 二的記號。3. 兩點鐘。4. 兩歲。n. -ness
  • dimensional : adj. 1. 尺寸的。2. 空間的。3. 【數學】因次的；…次（元）的。
  • spectrum : n. （pl. -tra ）1. 【物理學】譜，光譜；波譜；能譜，質譜。2. 【無線電】射頻頻譜；無線電（信號）頻譜。3. 【心理學】（眼睛的）余像；殘像。4. 〈轉義〉范圍，幅度；（連續的）系列。
  1. Affect on magnons energy spectrum of ferrimagnetism two - dimensional rectangle lattice by lattice coefficient

    晶格常數對亞鐵磁性二維長方晶格磁振子能譜的影響
  2. A large planar microphone array, which consists of 111 microphones, was successfully applied to obtain a two - dimensional mapping of the sound sources on a landing aircraft. the focus of study in this paper is on the landing gear noise source. the spectra, directivities and sound pressure levels of flap side - edge noise of 7 narrow - board commercial aircraft and 7 wide - board commercial aircraft are presented. it is found that the landing gear noise spectrum is broadband with some single tones in some cases. the directivity of the total sound pressure level of a landing gear noise resembles that of a horizontal dipole. the level differences between the various aircraft landing gears are larger than those expected from the airspeed differences. it is thus expected that the louder noise emission of the landing gears can be reduced by redesigning

    應用由111個傳聲器組成的平面傳聲器陣列對當前流行的民用客機進場著陸過程中的機體噪聲源進行了實驗測量，本文對七架窄體客機和七架寬體客機的起落架噪聲進行了分析，得到了起落架噪聲的頻譜特性、指向特性和聲級變化.研究發現，起落架噪聲的頻譜是由寬頻隨機噪聲與一些較為明顯的單音噪聲源組成，起落架噪聲的指向性類似於一個水平放置的偶極子.不同飛機起落架噪聲的聲級相差較大，這說明可以通過重新結構設計降低起落架噪聲。
  3. Abstract : a large planar microphone array, which consists of 111 microphones, was successfully applied to obtain a two - dimensional mapping of the sound sources on a landing aircraft. the focus of study in this paper is on the landing gear noise source. the spectra, directivities and sound pressure levels of flap side - edge noise of 7 narrow - board commercial aircraft and 7 wide - board commercial aircraft are presented. it is found that the landing gear noise spectrum is broadband with some single tones in some cases. the directivity of the total sound pressure level of a landing gear noise resembles that of a horizontal dipole. the level differences between the various aircraft landing gears are larger than those expected from the airspeed differences. it is thus expected that the louder noise emission of the landing gears can be reduced by redesigning

    文摘:應用由111個傳聲器組成的平面傳聲器陣列對當前流行的民用客機進場著陸過程中的機體噪聲源進行了實驗測量，本文對七架窄體客機和七架寬體客機的起落架噪聲進行了分析，得到了起落架噪聲的頻譜特性、指向特性和聲級變化.研究發現，起落架噪聲的頻譜是由寬頻隨機噪聲與一些較為明顯的單音噪聲源組成，起落架噪聲的指向性類似於一個水平放置的偶極子.不同飛機起落架噪聲的聲級相差較大，這說明可以通過重新結構設計降低起落架噪聲。
  4. In additive white gaussian noise ( awgn ) channel, we introduce a method for synchronization of symbol timing and frequency for two - dimensional spread spectrum system without prior knowledge of spread spectrum matrix

    摘要針對加性白高斯噪聲通道，考慮未知二維擴頻矩陣的條件下，提出了一種二維擴頻系統的時頻同步方法。
  5. Some novel technologies are also proposed, such as two dimensional spread spectrum ( 2d - ss ), self - encoded spread spectrum ( sess ), multiple input multiple output ( mimo ), orthogonal frequency division multiplexing ( ofdm ) and so on

    另外，對目前新興的一些抗干擾技術，如二維擴頻、超寬帶、多天線、自編碼擴頻等技術也做了簡單分析。
  6. By analysis of frequency spectrum based on matlab platform, wavelet method in the application of cutting out a section of inputting earthquake wave was presented. in the process of pseudo dynamic test results, the method of non - dimensional representation and analytic representation of hysteretic curve was provided. the above two methods will help to compare dissipation energy capacity of this structure at the different acceleration peak value stage of pseudo dynamic test more precisely and comparably

    通過基於matlab的地震波頻譜分析，說明了小波分析方法在擬動力試西安建築科技大學博士學位論文驗中地震波截取方面的應用；在擬動力分段試驗數據的處理方面，本文將試驗結果的無綱量表示方法以及曲線的多項式擬合法引入滯回曲線的數據處理，這將有助於擬動力試驗不同加速度峰值條件下，各階段結構耗能能力的客觀比較。
  7. Surface electromyography signal power spectrum during static load using two - dimensional mapping analysis

    靜態負荷表面肌電信號功率譜的二維地形圖分析
  8. A modified two - dimensional dynamic effective stress method is established and also the corresponding program presented in the paper. and the method is used for analyzing the effects of liquefaction of sand soil zone on surface ground motion and the response spectrum of acceleration 、 velocity and displacement

    本文在現有研究的基礎上，建立了一種土體二維有效應力動力分析方法並編制了相應程序，並以此計算分析了飽和液化砂層對地表加速度反應譜、速度反應譜、位移反應譜的影響。
  9. The algorithm acquires the quantity of two - dimensional spatial translation by means of projecting each frame apart along horizontal and vertical direction and using multi - resolution spectrum decomposition approach to process the two projection vectors, respectively

    該演算法首先引入積分投影方法將圖像序列中的每幀圖像轉換成兩個一維積分投影向量，再應用多分辨譜分解方法對兩個投影向量分別進行處理，從而精確地獲取圖像在二維空間上的亞像素平移量。
  10. Based on the periodical characteristic of the two - dimensional spread spectrum matrix, the method estimates the frequency offset, and then synchronizes the symbol timing by moving the position of data - storage window to calculate the maximum eigenvalue of correlation matrix

    該方法利用二維擴頻矩陣周期性重復的特點，先估計出頻率偏差，再通過滑動暫存窗求相關矩陣最大特徵值，完成信號的時間同步。
  11. Multicarrier wireless communications have been widely investigated in the past decades. recently, two - dimensional spread spectrum ( 2d - ss ) system has drawn a lot of attention because of its full utilization of spreading characteristics in the frequency domain and time domain. compared with multicarrier code division multiplex access ( mc - cdma ), 2d - ss system can effectively mitigate multiple access interference ( mai ) due to spreading in the time domain

    當前多載波無線通信技術得到了廣泛的研究，二維擴頻通信系統是近年來提出的新的擴頻通信方式，由於二維擴頻系統從時域和頻域上分別對數據信號進行頻譜擴展，因此它同時具有時域擴頻和頻率擴頻通信系統的特點，是對傳統的一維時域直接序列擴頻和多載波擴頻的推廣。
  12. Two - dimensional fluorescence spectrum

    二維熒光光譜
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