正交載子 的英文怎麼說

中文拼音 [zhēngjiāozǎizi]
正交載子 英文
quadrature carrier
  • 正 : 正名詞（正月） the first month of the lunar year; the first moon
  • 交 : Ⅰ動詞1 （把事物轉移給有關方面） hand over; give up; deliver 2 （到某一時辰或季節） reach （a cert...
  • 載 : 載Ⅰ名詞（年） year : 一年半載 six to twelve months; six months to a year; 三年五載 three to five ...
  • 子 : 子Ⅰ名詞1 （兒子） son 2 （人的通稱） person 3 （古代特指有學問的男人） ancient title of respect f...
  1. At present, the investigation of trading model in the native still rest on realising the traditional trading model using information skills, little work has been done in lucubrating the business model and exercising successfully. although foreign investigation has gained some successes and brought forward some typical trading models such as fixed price selling, biliteral multi - step negotiation and all kinds of auction, there still exists some problem such as information overloading or resource mazing in these models, which aggravate users " burden. how to realise an efficient, intelligent trading model based on the multi - agent technique has become an important task for the research of electronic commerce

    目前，國內對電子商務的研究還停留在以信息化實現傳統交易模型的層次上，真正深入研究業務模型並成功應用的還很少?國外研究雖然取得一定突破，並提出了幾種典型的市場交易模型如:定價交易，雙邊多步協商交易，以及各種形式的拍賣拍買交易等?但這些模型大都存在信息過載或資源迷向的問題，增加了交易主體的負擔，如何應用多代理技術實現一種高效
  2. The former was related to mn doping, both of p - carries supplied by la3 + or oxygen hole and n - carries induced by changing mn4 + into mn3 + can be locally displaced and simultaneously response with external electric field., furthermore due to the overlaps between positive and negative carries. the latter was due to the phase transformation between orthorhombic and cubic, which was in fact the curie point

    前者為la ~ （ 3 + ）和氧空位等產生的p型載流子和mn離子變價引入的n型載流子在外電場下發生局域重排產生的載流子極化，且由於正負載流子的迭加效應所致，該介電峰與mn離子的摻入相關；後者為體系出現相應的正交與立方結構的轉變所致，也即居里點。
  3. Green fluorescent protein ( gfp ) gene was conjugated to the 3 " end of the pap gene in order to screen easily of the transgenic cotton plants. the combined gene was cloned into plant expression vector pbi121 and then transformed. about 5000 seeds of the transgenic cotton were obtained and the some seedlings of the transgenic cotton could give a bright green fluorescence in the dark condition when the cotton seedlings were irradiated with ultraviolet rays

    為了便於轉基因棉花後代的篩選，在pap基因的3 』端融入了綠色熒光蛋白gfp ）基因，然後將融合基因克隆在植物表達載體pbi121上，再進行遺傳轉化，得轉基因棉花種子5000餘粒，將種子播種長到于葉展開時，先在黑暗中用紫外燈照射，查找表現綠色熒光的幼苗，然後再用地高辛（ dig ）標記的pap基因特異性探針對這些棉花進行點雜交，最後發現有8株棉花表現陽性反應，說明pap基因的確己經轉到了棉花的基因組中，其棉花黃萎病的抗性鑒定正在進行之中。
  4. Orthogonal frequency division multiplexing ( ofdm ) is a special case of multicarrier transmission, in which a single high data rate datastream is transmitted using a number of lower data rate subcarriers

    Ofdm （正交頻分多路復用）是一種特殊的多載波傳輸方式，由於它使用一系列低速子載波并行傳輸數據，使得傳輸速率得到大幅度提高。
  5. Orthogonal frequency division multiplexing ( ofdm ) is a special case of multicarrier transmission, in which a single high rate datastream is transmitted using a number of lower data rate subcarriers

    Ofdm （ orthogonalfrequencydivisionmultiplexing正交頻分多路復用）是一種特殊的多載波傳輸方式，由於它使用一系列低速子載波并行傳輸數據，使得傳輸速率得到大幅度提高。
  6. However, the paralleling communication can meet the requirements of high speed and fidelity in underwater signal transmissions. ofdm is a kind of novel paralleling transmission technology. the principle of ofdm is that the whole bandwidth can be divided into some subchannels, the high - speed serial signal stream is modulated by some orthogonal subcarriers

    正交頻分復用（ ofdm ）是近年來數字通信中流行的一種并行傳輸新技術，其核心思想是將整個可用頻帶分割成多個正交子通道，將待傳輸的高速串列碼流并行的調制在這些子通道載波上。
  7. Iterative inter - carrier interference cancellation in ofdm systems

    正交頻分復用子載波間干擾抵消的迭代演算法
  8. Secondly, to achieve the independent regulation of active and reactive power output from the generator side which is designed for the purpose of tracing the maximum wind - energy capturing. the paper has analyzed the mathematic model of the ac excited doubly - fed machine and the stator field orientation control strategy of the motor as vscf wind power generator. thirdly, it has put forward and designed the dual pwm converter with the capacity of energy flowing bidirectional aimed at the demand of rotor energy bidirectional flow. the author constructed reliable and integrated experimental system and did a series of experimental study including no - load, cutting - in network and power generation at, below and above the synchronous speed

    論文首先分析了風機運行特性及其最佳風能利用原理，通過模擬及實驗驗證了採用直流電機的輸出特性模擬風力機的最大輸出功率曲線的可行性，並給出了模擬系統的硬體結構；然後為了實現交流勵磁發電機有功、無功功率獨立調節機理，分析了交流勵磁雙饋發電機的數學模型和在追蹤最大風能捕獲變速恆頻風力發電時必需的定子磁鏈定向矢量控制策略；針對雙饋發電機轉子能量雙向流動的要求，提出並設計了具有能量雙向流動能力的雙pwm交流勵磁用變頻器；最後為實現從理論到實踐的全面研究，研製出了一套小功率完整的雙pwm變頻器交流勵磁的雙饋風力發電機實驗系統，進行了空載、並網、同步速及上、下的發電運行等一系列的運行實驗；所完成的模擬和實驗研究均驗證了理論、模型和控制策略的正確性、可行性。
  9. Finally, basing on the if sr receiver subsystem hardware platform, by ad6620 programming on the line and tms320c6713 loading the digital signal quadrant demodulation program, the thesis having realized the demodulation of the am signal, which validates the key thinking of software radio

    .最後，本文基於中頻軟體無線電接收機子系統硬體平臺，通過ad662o的在線可編程、 tms32oc6713加載數字信號正交解調程序，實現了對中頻am信號的解調，驗證了軟體無線電關鍵思想。
  10. Since 1990s, e - data exchange, e - funds transfer and security certificate has been maturely step by step, especially the popularization of internet and e - commerce. the current business structure and distribution system will be changed and become the potential and active trading carrier in 21 century. e - commerce changes the traditional commodity trading concept and make the traditional taxation collection faced the new challenges

    當前，以國際網際網路為媒介進行的商務活動正在全球范圍內興起， 20世紀九十年代以來，伴隨著電子數據交換，電子資金轉帳和安全認證等相關技術的日益成熟，特別是網際網路的普及，電子商務發展日益迅猛，全球電子商務即將改變現有的商業形態及其流通體系，將會成為21世紀最具潛力和活力的貿易載體，改變了傳統的實物貿易觀念，使得傳統的稅收征管面臨著新的挑戰。
  11. A group of orthogonal frequency carriers are used in ofdm system to improve the using rate of spectrum. if the orthogonal character can be held and ignore the inter - channel interference ( ici ), the symbol error character of ofdm depend on the modulate of source codes. this dissertation propose the theoretic formula of ofdm - qam and ofdm - psk in this precondition

    為了提高頻譜利用率， ofdm系統使用了一組正交的子載波來傳輸信號，若能保證各子載波間的正交性不被破壞、不考慮通道間干擾（ ici ） ，則ofdm系統的誤碼性能由信元調制方案的誤碼性能決定，文中推導了該情況下ofdm - qam和ofdm - psk的理論誤碼率公式。
  12. When a synchronization error exists, the orthogonality between sub - carriers ca n ' t be maintained, serious inter - carrier interference is introduced and demodulation performance will be degraded greatly

    當存在同步錯誤時，子載波之間的正交性遭到破壞，從而引起嚴重的載波間干擾，使解調性能大大下降。
  13. Recently, multiple input multiple output ( mimo ) system which originates from the employment of multiple antennas at transmitter and receiver has many advantages such as large system capacity, high spectral efficiency. on the other hand, orthogonal frequency division multiplexing ( ofdm ) which bases on the orthogonal transmission of sub - carriers also has some obvious merits such as strong anti - multipath ability, high spectral efficiency. the combination of the two techniques mimo - ofdm, has become a hotspot recently and regarded as promising technique for future next - generation mobile communication systems

    近來，在無線通信系統中的收發兩端同時使用多根天線的多入多出（ mimo ， multiple - input - multiple - output ）通信結構，具有系統容量大、頻譜效率高等優點;基於正交的多路子載波并行傳輸的正交頻分復用（ ofdm ， orthogonalfrequencydivisionmultiplexing ）技術，具有抗多徑能力強、頻譜效率高等優點，二者的結合，即mimo - ofdm技術，被認為是構建下一代移動通信系統的框架技術。
  14. Firstly, in wireless environment, receiver has no know the time delay between transmitter and itself. in ofdm system, ofdm data is transmitted as one symbol, so in order for correct demodulation, the correct start of symbol should be got from ofdm system to reduce the effect of isi. secondly, the high frequency utilization in ofdm is based on the orthogonal properties of sub carriers. if frequency offset is generated, the orthogonal properties among sub carriers will lost, that will cause inter carrier interference ( ici ) and high ber of system

    Ofdm技術也存在著一些缺陷，首先，在無線環境中傳輸的ofdm信號對定時要求高，為了減少碼間串擾（ isi ）影響，必須從接收信號中提取出正確的符號起始位;其次， ofdm系統對頻率偏移敏感， ofdm技術的高頻譜利用率和傳輸可靠性均以子載波的正交性為基礎，如果接收機和發射機之間發生頻率偏移，子載波之間就會失去正交性，導致嚴重的子載波間干擾（ ici ） ，降低系統性能。
  15. As to e - commerce, just as " no comprehension of the advanced technical characteristics of the internet, no countermeasure " usa said in selected tax policy implications of global commerce. this part discusses the characteristics of e - commerce different from traditional commerce due to the particularity of the carrier on which e - commerce operates in order to provide the theoretical foundation for legislation of the tax rules on e - commerce and the rules " maneuverability from the technical characteristics

    對于電子商務而言，正如美國在《全球電子商務選擇性稅收政策》中所說「沒有對網際網路等先進技術特徵的理解，就無法制定出相應的對策」 ，本部分從電子商務的內涵入手論述了由於電子商務運行載體之特殊性而造成的電子商務不同於傳統商務的特徵即電子商務交易主體的虛擬化、非中介化、交易對象的數字化與國際化，以便從技術特徵方面為電子商務涉稅規則的制定與所制定規則的可操作性提供相應的理論基礎。
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