消弱系數 的英文怎麼說
中文拼音 [xiāoruòxìshǔ]
消弱系數
英文
extinction coefficient-
Under some natural weak assumptions that do not require the technological coefficients matrix is indecomposable, the fact that the dynamic input - output system is not asymptotically stable and the closed dynamic input - output model exists a balanced growth solution is proved
利用矩陣特徵值理論和廣義系統理論，在相對弱的條件下（不需要直接消耗系數矩陣不可分解） ，證明了動態投入產出系統不是漸近穩定的。Iv ) for the strong interfacial coupling, there exist three pyroelectric peaks in the temperature curve of pyroelectric coefficient, and with the decrease of the interfacial coupling, the number of the pyroelectric peaks will decrease gradually
我們還發現，較強的界面耦合導致熱電系數的溫度曲線上的三個熱電峰的出現；而界面耦合強度的減弱及鐵電超晶格尺寸的減少將導致某些熱電峰的消失。We also find that the strong long - range interaction, the large transverse field and weak interfacial coupling can lead to the disappearance of some of the peaks of the pyroelectric coefficient and susceptibility of the ferroelectric bilayer. we believe that it is the reason why these phenomena always take place in the experimental studies
我們還發現，較強的長程相互作用，較大的橫場以及相對較弱的界面耦合作用將會導致鐵電雙層薄膜的熱電系數和介電極化率的某些峰消失，這可以用來解釋在實驗中常常觀測不到熱釋電系數和介電極化率的某些峰值的原因。The conventional variable structure control technique for uncertain system requires that the uncertainty bound is known as a premise to assure robustness. the requirement creates an over - conservative controller and enlarges chattering. the proposed controller regards the influence of unknown disturbances and parameter uncertainties as an equivalent disturbance and generates an on - line estimation used in smc to cancel the slowly varying uncertainties by the mechanism of time delay. the reaching law approach is used to get the conditions and band of quasi - sliding mode. the new methodology offers a robust feedback control with much lower gains and reduces chattering without a prior knowledge of the uncertainty bounds or matched conditions
常規變結構控制用於不確定系統，須利用不確定性界確保系統的魯棒性，控制器過于保守且抖振變大.本文把未知干擾和參數不確定性的影響等效為名義系統的外界干擾，利用時延技術對干擾進行在線估計，並將估計值引入到變結構控制中，從而抵消掉系統中的慢變不確定性，利用離散趨近律法，推出了準滑動模態的存在條件及其帶寬.該方法克服了以往控制方法中須已知不確定性界的限制，且不必滿足匹配條件，用較低的控制增益保證了系統的魯棒性，降低了準滑動模態帶即削弱了抖振Abstract : the conventional variable structure control technique for uncertain system requires that the uncertainty bound is known as a premise to assure robustness. the requirement creates an over - conservative controller and enlarges chattering. the proposed controller regards the influence of unknown disturbances and parameter uncertainties as an equivalent disturbance and generates an on - line estimation used in smc to cancel the slowly varying uncertainties by the mechanism of time delay. the reaching law approach is used to get the conditions and band of quasi - sliding mode. the new methodology offers a robust feedback control with much lower gains and reduces chattering without a prior knowledge of the uncertainty bounds or matched conditions
文摘:常規變結構控制用於不確定系統，須利用不確定性界確保系統的魯棒性，控制器過于保守且抖振變大.本文把未知干擾和參數不確定性的影響等效為名義系統的外界干擾，利用時延技術對干擾進行在線估計，並將估計值引入到變結構控制中，從而抵消掉系統中的慢變不確定性，利用離散趨近律法，推出了準滑動模態的存在條件及其帶寬.該方法克服了以往控制方法中須已知不確定性界的限制，且不必滿足匹配條件，用較低的控制增益保證了系統的魯棒性，降低了準滑動模態帶即削弱了抖振When the isotropic waveguide is under the isotropic disturbances, the coupling term due to polarization, which is presented in the coupled - mode theory of the wei - ping huang, is n ' t included in this rigorous vectorial coupled - mode theory, exactly, the rigorous vectorial cmt does n ' t contain the coupling term due to polarization which is include in the scalar coupled - mode theory because this term is counteracted with the other coupling term neglected under weakly guiding approximation. as for anisotropic disturbances, we get the coupled - mode equations with arbitrary dielectric tensors. from them, we obtain the coupled - mode equations of the slowly varying term c ( z ) which is more simplicity
當受到各向同性微擾時，我們發現嚴格的矢量理論所得到的耦合系數表達式中並不包括wei - pinghuang的理論中的偏振耦合項，更確切的說，偏振耦合項正好與因弱導近似而忽略的項相抵消，這就是標量理論所得到結果（有偏振耦合項）與矢量理論在標量近似下的結果（不含偏振耦合項）不一致的原因所在；當各向異性微擾時，我們得到了包含微擾介電張量各個分量的橫電磁場耦合波方程，討論了微擾介電張量各個分量對耦合的影響，而且從橫電磁場耦合波方程出發得到了形式更加簡單的只含有橫電場系數的緩變分量c _ （ z ）的耦合波方程和耦合系數表達式，並以弱導近似下的單模光纖兩正交偏振模耦合為例對耦合系數在不同條件下的取捨做了定性的分析。On the loess plateau, water is the main limiting factors for vegetation growth. root distribution characters have special ecological meaning as it reflected the utilizations of trees to the environments. even - aged stands of robinia pseudoacacia on slope lands facing south and north were selected as sampling plots for root distribution investigation. investigatiing results showed that indicated that on all sites, root biomass decreased with depth, and the distribution depth of fine root was deeper than that of coarser root. the results of variance analysis indicated that there were great differences in root biomass among different diameter classes, and coarser root was the main sources of variance, and the root biomass, especially fine root ( < 3mm ) biomass on northern exposition sites was bigger than that on southern exposition sites. analysis of the vertical root distribution parameters, root extinction coefficient, indicated that the value of on northern exposition was more than 0. 982, while the value of on southern exposition was less than 0. 982, which indicated that the vertical root distribution depth of robinia pseudoacacia on southern exposition was deeper than that on southern exposition. and the distribution depth of fine roots ( < 1mm ) was deeper than that of thicker roots ( < 3mm ), which was in favor of the uptake of water and nutrients from deeper layers, helped the trees to adapt the arid environment, and promoted the growth of the upper parts of the tree
在中國西北黃土高原地區，水分是樹木生長發育的主要限制因子.根系分佈特徵由於反映了樹木對環境條件的利用程度而具有更加特殊的生態意義.本研究選擇陽坡和陰坡不同立地上年齡一致的刺槐林調查了根系分佈特徵.根系垂直分佈特徵的調查結果表明，在所有立地上，根系生物量隨著深度的增加而降低，其中細根的分佈深度大於粗根的分佈深度.方差分析結果表明:不同立地上不同徑級根系的分佈特徵也有明顯的差別，粗根是差異存在的主要原因，陰坡立地上的根系生物量，特別是細根生物量大於陽坡立地上的.對根系消弱系數的分析結果表明，陰坡立地上的根系消弱系數大於0 . 982 ，而陽坡立地上的根系消弱系數小於0 . 982 ，說明陰坡立地上刺槐根系的生物量在深層土壤中的分佈相對量更大一些.其中細根的根系消弱系數大於粗根的，這種根系分佈特徵有利於根系對深層土壤水分養分的吸收利用，進而促進樹木地上部分的生長發育.圖3表3參15Abstract : on the loess plateau, water is the main limiting factors for vegetation growth. root distribution characters have special ecological meaning as it reflected the utilizations of trees to the environments. even - aged stands of robinia pseudoacacia on slope lands facing south and north were selected as sampling plots for root distribution investigation. investigatiing results showed that indicated that on all sites, root biomass decreased with depth, and the distribution depth of fine root was deeper than that of coarser root. the results of variance analysis indicated that there were great differences in root biomass among different diameter classes, and coarser root was the main sources of variance, and the root biomass, especially fine root ( < 3mm ) biomass on northern exposition sites was bigger than that on southern exposition sites. analysis of the vertical root distribution parameters, root extinction coefficient, indicated that the value of on northern exposition was more than 0. 982, while the value of on southern exposition was less than 0. 982, which indicated that the vertical root distribution depth of robinia pseudoacacia on southern exposition was deeper than that on southern exposition. and the distribution depth of fine roots ( < 1mm ) was deeper than that of thicker roots ( < 3mm ), which was in favor of the uptake of water and nutrients from deeper layers, helped the trees to adapt the arid environment, and promoted the growth of the upper parts of the tree
文摘:在中國西北黃土高原地區，水分是樹木生長發育的主要限制因子.根系分佈特徵由於反映了樹木對環境條件的利用程度而具有更加特殊的生態意義.本研究選擇陽坡和陰坡不同立地上年齡一致的刺槐林調查了根系分佈特徵.根系垂直分佈特徵的調查結果表明，在所有立地上，根系生物量隨著深度的增加而降低，其中細根的分佈深度大於粗根的分佈深度.方差分析結果表明:不同立地上不同徑級根系的分佈特徵也有明顯的差別，粗根是差異存在的主要原因，陰坡立地上的根系生物量，特別是細根生物量大於陽坡立地上的.對根系消弱系數的分析結果表明，陰坡立地上的根系消弱系數大於0 . 982 ，而陽坡立地上的根系消弱系數小於0 . 982 ，說明陰坡立地上刺槐根系的生物量在深層土壤中的分佈相對量更大一些.其中細根的根系消弱系數大於粗根的，這種根系分佈特徵有利於根系對深層土壤水分養分的吸收利用，進而促進樹木地上部分的生長發育.圖3表3參15Firstly it uses data mining and statistic algorithms to detect dos attacks, and then determines the feature of attack flows, lastly uses various defense methods to weaken or eliminate the effect of attacks. the system ensures that when the network or victim systems are being attacked, they can continue to serve legitimate users
它利用數據挖掘和統計演算法等檢測技術檢測dos攻擊，確定攻擊流量的特徵，並採取多種防禦措施來削弱和消除攻擊流量對網路和系統的影響，確保在攻擊發生的情況下，仍能為合法用戶提供服務。Using the order - up - to ( out ) method and two demand forecasting patterns, that are exponential smoothing forecasting and moving average forecasting, we give the frequency response plot and the noise bandwidth figure with the help of the system control tool of matlab. we show that information sharing helps to reduce the bullwhip effect, especially at higher levels in the chain. however, the bullwhip effect problem is not completely eliminated and it still increases as one moves up the chain
本文的重點內容就是用控制論的理論和方法來研究牛鞭效應，應用補充到目標庫存策略（ out ）和兩種不同的需求預測方法，即指數平衡預測法和移動平均數預測法，用matlab的系統控制工具箱作為分析工具，分別給出了信息共享情況下和無信息共享情況下的頻率響應圖和帶寬比較圖，證明了信息共享能夠減弱牛鞭效應，尤其是在供應鏈的高級階段，但牛鞭效應並不能完全消除，仍舊隨著供應鏈階段的上升而增加。Just as the role of infantry is to " close with and destroy the enemy, " the last half of the definition explains that iw is used to attack or defend, directly or indirectly, as a means to dominate, degrade or destroy, or protect or preserve data, knowledge, beliefs or combat power potential
第四，正像步兵的任務是「接近並消滅敵人」一樣，定義的後半部分說明信息戰「以對信息系統的直接或間接進攻和防禦為手段，達成對數據、知識、信念或戰斗潛力的控制、削弱、破壞、保護或貯存。 」分享友人