衰變系統 的英文怎麼說

中文拼音 [shuāibiànxìtǒng]
衰變系統 英文
decay scheme
  • 衰 : 衰動詞（衰弱） decline; wane
  • 系 : 系動詞（打結; 扣） tie; fasten; do up; button up
  • 統 : Ⅰ名詞1 （事物間連續的關系） interconnected system 2 （衣服等的筒狀部分） any tube shaped part of ...
  • 系統 : 1. （按一定關系組成的同類事物） system 2. （有條理的;有系統的） systematic
  1. And then facing the problem of the channel estimation of the adaptive modulation system, we conclude out the channel estimation algorithms on maximum likelihood ( ml ) estimation and maximum a posteriori ( map ) estimation under the condition of flat fading channel and selective fading channel in detail. to meet flat fading channel, we simulate the relationship of the ratio between the error covariance in map estimation and ml estimation and pilot symbol message length. the conclusion can be drawn from these results

    接著，對自適應調制系統中的通道估計問題難點，詳細推導了平衰落通道條件下和選擇性衰落通道條件下最大似然（ ml ）估計和最大后驗概率（ map ）估計演算法，針對平衰落通道，我們模擬了map估計和ml估計的方差與導頻符號長度的關系，模擬結果表明，錯誤方差受多譜勒頻率的變化影響最大，並且對實際的自適應調制系統，導頻符號長度的取值超過20個符號長度時， map通道估計明顯優于ml通道估計。
  2. The primary structures, the genesis and the structure formed of the primary vascular system and the structural change in the process of cotyledonary senescence of the seedlings of antirrhinum majus and other angiosperms were studied. the progress had been aquired in the aspects as follows

    本論文對金魚草等幾種被子植物幼苗的初生結構、幼苗發育早期初生維管系統的發生和建成后初生維管系統的結構以及子葉衰老過程中的結構變化作了較為全面的研究，在以下幾個方面取得了一定的進展： 1
  3. Using the multi - configuration dirac - fock method ( mcdf ), we studied the characteristic of the decay processes of the 4d core excited states of csiv, the low - lying excitation structure of super - heavy element bohrium ( z = 107 ) and the x - ray spectra of the 3d - 4f transitions of highly charged xenon ions in details in this work, by including the electron correlation and the relaxation effects systematically

    本論文運用mcdf方法，通過系統考慮電子相關效應和馳豫效應，分別研究了cs離子的4d內殼層激發態衰變動力學特性，超重元素bh （ z = 107 ）的低激發態結構以及高離化態氙離子的3d - 4f躍遷產生的x射線譜的結構等問題。
  4. This paper aims to explore systematically some scientific principles of resource - based cities from their formation and development to contabescence or transformation in the context of theories of resource life cycle and sustainable development. it also discusses the scientific issues of connotation, models and transformation mechanism of resource - based cities, makes an integrated assessment on their sustainable and renewable capiabilities of those cities and brings out several measures and policies for the transformation of resource - based cities in china

    本論文的研究目的是從資源生命周期理論、可持續發展理論等出發，系統地分析總結資源型城市從形成、發展到衰亡或轉型的整個過程中的科學規律，探索資源型城市功能變化機制的科學問題，科學界定資源型城市內涵和發展或轉型模式，綜合評定資源型城市可持續發展和再生能力，探索我國資源型城市功能轉型機制和發展模式以及各種途徑與對策。
  5. The fatigue behavior of strength, stiffness, and deformation of concrete is analysed systematically. the fatigue equation is established. the empirical expressions of the total longitudinal strain and the elastic modulus are given, and the relationships between the increasing rate of the total second - stage strain and the decreasing rate of the elastic modulus with the cyclic number are obtained

    系統地分析了砼抗拉、拉-壓疲勞強度、剛度、變形規律；建立了相應的s - n關系，提出了縱向總應變、彈性模量的經驗公式，及其第二階段總應變增長率、彈性模量衰減率分別與疲勞壽命的關系式。
  6. In this way, the self - similar multi - fractal property of the hadronic system produced in z0 ( ) decay is strictly confirmed and the corresponding fractal dimensions and levy index are obtained in the first time using the high statistics data from the l3 experiment at lep

    這樣就精確地驗證了在z ~ o衰變能量下的e ~ + e ~ -對撞末態強子系統是多重自相似分形，並首次用實驗測出了相應的分形維數與l vy指數。
  7. This experiment was performed using the " yingqing " peach fruit and " chunxing " strawberry to study the changes of the main physiology - biochemistry characteristics and the microsome membrane ca + - atpase activities during the fruits ripening. the effects of ethylene, trifluoperizine ( tfp ) + ethylene and verapamil ( ver ) + ethylene treatments on the above changes were discussed. the objects of the thesis may further explore the role of calcium messenger in the ethylene signal transduction, and provide some new theoretical basis for further research of the microsome membrane ca2 + - atpase during the fruits ripening

    本論文以迎慶桃和春星草莓為試材，研究了兩類果實采后在25和4條件下主要生理生化變化和ca ~ （ 2 + ） - atpase活性變化以及乙烯、鈣調素拮抗劑tfp +乙烯和鈣通道阻塞劑ver +乙烯處理對其的影響，為探討果實成熟衰老過程中，鈣信使系統在乙烯信號轉導中的作用，提供一定的理論依據，並為探索ca ~ （ 2 + ） - atpase在果實衰老中的作用及作用機制，提供實驗證據。
  8. As part of the longitudinal rush memory and aging project, researchers evaluated the spectrum of neuropathology found in the brains of 141 older adults, with and without clinically evident dementia

    作為"拉什" "記憶與衰老工程"長鏈的一環，研究人員們對發現的神經系統病變的病理譜做了評估分析，這些病變來自141名伴有或不伴有明顯癡呆癥狀的老年人的腦部
  9. Conclusions ( 1 ) subacute senile mouse model can be used in immunosenesence reseach. ( 2 ) cd 137 may be an marker of aging. ( 3 ) the protection to aicd of cd137 decreased, indicate the function of cd137 was unusual. ( 4 ) the effect of d - galactose can modelling the different stage of aging. ( 5 ) the decrease of cd 137 expression on t cell from subacute senile mouse model and the aging mouse were due to the declining of their mrna. ( 6 ) the expression of cd 137 on t cells from from subacute senile mouse model and the aging mouse have a time dependently derease and the peak of cd 137 expression appeared earlier while the aging keep going on

    結論（ 1 ） d -半乳糖致亞急性衰老小鼠模型t細胞cd137分子表達變化規律與自然衰老小鼠相似，造模兩個月後的大劑量組小鼠即可用於衰老個體cd137分子的相關研究。 （ 2 ）模型小鼠cd137分子表達隨衰老的發生發展呈規律性變化，提示該分子可能為t細胞衰老的分子標志。 （ 3 ）即使在衰老狀態下，機體對cd137分于的表達依然具有調控作用，提示兔疫系統的代償能力仍然存在。
  10. Main conclusions drawn from the analyses of calculating results are as follows : ( 1 ) the microwave absorption of atmosphere gas have obvious attenuation at the wavelengths for cloud detection, thereinto, the water attenuation effect changes greatly, so the 94ghz cloud detecting radar should have water vapor attenuation correction scheme. ( 2 ) when 37ghz and 94ghz radars detect clouds, the difference between the atmosphere and cloud attenuation and the large variety of radar reflectivity conduce the intension of the radar backscatter signals change. ( 3 ) for the thin cloud layer and low water content of cloud, 37 - ghz radar backscatter signals are not as good as 94 - ghz radar, that is to say that the 94ghz radar has better capability in thin clouds detection

    本工作得出如下結論： （ 1 ）大氣氣體的微波吸收在測雲波段產生明顯的衰減，其中水汽衰減效應變化很大；即將上天的空間94ghz測雲雷達必須有水汽衰減訂正方案； （ 2 ） 37ghz和94ghz雷達測雲，由於大氣和雲衰減不同和雷達反射率的很大差異，導致雷達回波信號強弱不同； （ 3 ）對雲層較薄、含水量較少的雲，在不計雷達參數的情況下， 37ghz雷達回波信號不如94ghz測雲雷達，也就是說94ghz對薄雲有更強的探測能力；對雲層較厚、含水量大的雲，由於強衰減的作用， 94ghz雷達回波信號小於37ghz雷達； （ 4 ）從大氣衰減的不利因素方面考慮，空間94ghz雷達測高層薄雲的效果最好；測低層薄雲時需要考慮氣體衰減訂正；因濃厚雲的強衰減作用，探測其中下部的能力大大減弱，不僅要進行衰減訂正，而且要藉助其他信息來反演整個雲層的含水量垂直分佈； （ 5 ）為了獲得從極薄到極濃厚雲的垂直分佈探測能力，未來測雲雷達系統最好採用雙波長甚至三波長（如94 、 37和13ghz ） 。
  11. When the neutron decay constant is measured in the zero power assembly, the dt external neutron measurement system ( scintillator photomultiplier tube detector st - pmt ) may provide trigger - signal and time correlationship

    摘要在零功率堆上進行了衰變常數測量實驗中，建立外中子源dt中子測量系統可以為物理診斷系統提供觸發信號和時間關聯信號。
  12. And, the attenuation rate rose out of fog is studied, calculating that and modeling it prediction formula using non - linear system identification method

    計算了霧的衰減率，並用非線性系統辨識方法得到了霧的衰減率的預報模型；計算了霧的反射率隨能見度的變化規律。
  13. The calculation shows that the attenuation of hydraulics oscillation relates to power, but other kinetic characteristics don ' t change with work point greatly

    通過計算表明，其水力振蕩衰減速度與出力有關，而系統的其他運動特性隨工況變化較小。
  14. Compared with three - level atomic system, the atomic coherence effects in four - level can lead to eit and eia, which depend on the intensity of control light and the relaxation of the fourth level

    與三能級原子系統相比，四能級原子相干效應即可導致電磁感應透明的產生，也可產生電磁感應吸收現象，取決于控制光的強度和第四個能級衰變率的大小。
  15. The proposed fuzzy sliding mode controller does not require any knowledge of a nonlinear system and attempts to improve both transient and stability margins

    建議的模糊滑動模式控制器是針對非線性系統在未知參數變化與結構下的強健追蹤控制，其設計包含補償器、衰減技術、模糊邏輯近似法。
  16. The tong - term tune bests of pinus yunnanensis management lead to bio - diversity decrease, diseases and insect pests damage, genetic degradation, and productivity decline

    摘要長期以來，雲南松的純林經營使得生物多樣性降低、林分穩定性變差、遺傳品質退化、林分生產力下降，從而導致生態系統功能衰退。
  17. The system can resolve the noise and impedance on the power line and obviously improve the abilities of anti - disturbance and successful rate of communication. at the same time, the software realy method and arithmetic is also introduced to settle the problem of attenuation and increase the distance of carrier communication, it can satisfy the need of remote reading meter system

    該系統有效地克服了電力線噪聲和阻抗變化等干擾因素，提高了抗干擾能力和通信成功率，同時提出軟體中繼的思想和演算法並加以實現，進一步抑制了線路衰減快的問題，使載波通信的距離增加，滿足了遠程抄表系統的要求。
  18. The intermittency indices q for orders 2 ~ 5 in hadronic system produced in e + e - collisions at z0 energy are thus measured exactly for the first time. there are different methods in the study of the dynamical fluctuations in high energy e + e ~ collisions

    ）方向，從而消除了因坐標系的選取引起的系統誤差，首次精確地測量出了z ~ o衰變能量下e ~ + - e ~ -對撞末態強子系統的2 - 5階間歇指數。
  19. The following algorithms have been proposed and tested in the thesis : 1 frequency selective fading : combine the isomorphism between the input space and the output space and propose a new approach to blind equalization of the channel. compared with conventional methods, the new approach offers lower computational complexity, better performance, and more robust against the over - determination of the system order ; 2 time selective fading : a new approach to the equalization of time selective channel based on the zero - forced equalizer is proposed which is more simple in its structure of algorithm ; 3 time - varying channel : using the instantaneous mean value changes of the output signal to extract the information of channel variations and model it using ar model, kalman filter is then employed to track channel variations, it bears faster ability in tracking the variation of tv channels ; based on the isomorphism between the inputs and the outputs and some of the approaches using in mimo system, a new algorithm of equalization of simo time - varying channel is proposed, which also share the merits of being robust against the over - determination of the system order ; model the time - varying channel using the multi - resolution decomposition wavelets, and then a blind identification method based " on the model is proposed ; at last, a new model for equalization and identification of mimo system is proposed

    主要工作在以下幾個方面： 1 、針對頻率選擇性衰落通道：結合輸入輸出空間同構關系提出一種新的頻率選擇性通道均衡方法，與傳統方法相比，該方法計算量更小，收斂速度更快，性能更優，且對系統階次的過確定表現穩健，具有實際均衡應用價值； 2 、針對時間選擇性衰落通道：提出一種基於迫零均衡的時間選擇性通道均衡方法，演算法結構簡單； 3 、針對時變色散通道：利用瞬態均值曲線提取通道時變信息，對之ar建模，利用卡爾曼濾波器跟蹤時變通道抽頭變化，可以快速跟蹤通道變化；基於輸入輸出空間之間的同構關系以及多輸入多輸出系統的處理方法，提出了新的單輸入多輸出色散時變通道均衡與識別演算法，同樣具有對通道階次過確定保持穩健的優點；結合小波多解析度分析提出一種基於小波模型的通道盲識別演算法；研究時變的多輸入多輸出系統的盲均衡與盲反卷積問題，給出一種時變系統處理模型。
  20. Combined with the data - selected schemes proposed, the computational complexity of this method can be lowered. the performance of the presented rls method is analyzed by simulations, and it is shown that this method is interesting for application. 4 time - selective channel signal model based on multipath - doppler diversity representation is given in multi - path fast fading channel, and rls space - time receiver algorithm based on time - varied constraint condition is presented and the computational complexity of this method is analyzed

    4 、針對多徑快衰落通道下的ds - cdma系統，給出了基於多徑-多譜勒觀點描述的1百安電弓卜科東兔j憶學協士學位論文時間選擇性通道的信號模型，提出了基於變約束條件下的遞歸最小二乘空時接收機演算法並分析演算法的運算量，最後通過模擬分析了所提出的方法的性能。
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