磁變周期 的英文怎麼說
中文拼音 [cíbiànzhōuqī]
磁變周期
英文
magnetic period-
For starters, the core ' s motion could help explain why magnetic north and south periodically wander or reverse over earth ' s history
就像起動器一樣，地核的運動有助於解釋南北磁極周期性變換或歷史上地球磁極的翻轉原因。Many planets ( for example, ganymede, mercury, the earth, jupiter and saturn ) and stars ( for example, the sun ) possess intrinsic magnetic fields. the explanation for their existence and variation remains a great challenge to planetary scientists and astrophysicists. this article attempts to review some recent developments and difficulties in the study of magnetohydrodynamics for the electrically conducting fluid interiors of planets and stars. it is the fluid motions, usually driven by thermal convection, that generate and sustain magnetic fields through magnetohydrodynamic processes in planets and stars. in planets, the magnetohydrodynamic processes are strongly affected by the combined and inseparable effects of rotation, magnetic fields and spherical geometry. the key dynamics involves the interaction between the coriolis and lorentz forces. in the sun, it is the solar tachocline, a thin shear flow layer located at the base of the convection envelope, that plays an essential role in the solar magnetohydrodynamic processes which produce the 11 - year sunspot cycle. some results of a new nonlinear three - dimensional solar dynamo model are also presented
許多行星（如木衛三，水星，地球，木星和土星）和恆星（如太陽）具有內部磁場.對這些磁場的存在和變化的解釋對行星科學家和天體物理學家是一個巨大的挑戰.本文試圖總結行星和恆星的導電流體內部磁流體力學研究的新近發展和困難.一般由熱對流驅動的流動通過磁流體力學過程產生並維持在行星和恆星中的磁場.在行星中磁流體力學過程強烈地受到轉動，磁場和球幾何位型的綜合影響.其動力學的關鍵方面涉及科里奧利力和洛倫茲力間的相互作用.在太陽中其流線，即處于對流層的薄的剪切流層在太陽的磁流體力學過程中扮演了一個基本的角色，並由之產生了11年的太陽黑子周期.本文也給出了一個新的非線性三維太陽發電機模型Deltan heliographers observe an irregularity in the magnetic cycle of the star delta. the shift of the stars magnetic polarity which usually occurs every 12 years has occurred 1 year early
德爾塔日光儀觀察到星球德爾塔的磁極周期不規則性變化；該星球每12年移動一次的磁極變化剛剛在一年前發生過。Based on netomac, a software package for power system simulation, the model and algorithm of pre - dispatch schedule in generation markets, excitation system parameter setting, and power system small signal stability anaylsis are studied in this thesis. the main work is as follows : a model of pre - dispatch schedule is proposed, whose target is to minimize the market purchasing price ( mpp ) in the whole pre - dispatch period. then according to the characteristics of pre - dispatch schedule, the model of pre - dispatch schedule is simplified to minimize the mpp in each pre - dispatch time, and a three - step algorithm of pre - dispatch schedule is designed : dealing with the optimal problem in the whole period of pre - dispatch with static planning method, solving the problem of combination of machines with pr1 method, resolving problem of optimal power flow ( opf ) with modified powell method
本文基於netomac模擬軟體，以發電市場預調度計劃模型及演算法、勵磁系統參數整定和電力系統小擾動穩定性分析為研究內容，主要做了以下工作：建立了以整個預調度計劃周期內的市場購電價格最小為目標的發電市場預調度計劃模型，並根據預調度計劃問題狀態數多、變量多、混合整數、非解析的特點，將預調度計劃模型的目標函數簡化為各時段的市場清算電價最小，設計了三段式預調度演算法：用靜態規劃法求解整個預調度計劃周期內的優化問題；用優先級法求解機組組合問題；用改進的powell法求解最優潮流問題。The results show that there are really obvious scintillation in gcrs intensity at the periods of 10 - 60 minutes as expected by many scientists, such as dorman, et al. then we analyzed the data observed at beijing snm between two solar cycles " transitional phases by using wavelet method
我們還計算了幾個磁暴前銀河宇宙線強度的短周期的變化特徵，計算結果顯示，磁暴前銀河宇宙線強度在10 ? 60分鐘范圍內出現明顯的閃爍，這是磁暴前銀河宇宙線強度變化的的一種先兆特徵。It is found that, tinder certain conditions, the first or the second perpendicular phase component of the multi - mode functional superposition stale ligh field can present any generalized nonlinear equal - power higher - power sum - squeezing effect which changes periodically
結果表明，在一定的條件下，該態的第一正交相位分量（即廣義磁場分量）和第二正交相位分量（即廣義電場分量）分別呈現出周期性變化的廣義非線性等冪次高次和壓縮效應。Through calculation on varied parameter, a group of suitable parameter is found out. the results of experiments indicate that the theoretical analysis to the magnetic field of the magnetic structure is proper. to remove the result error come from the change of gap between piston rod and sensor, a signal processing method accompanied with machine learning process is researched
為消除傳感器與磁性標尺之間間隙變化對測量結果的干擾，將示教學習方法引入行程傳感液壓缸的信號處理過程，並使用改進的遺傳演算法解決自學習過程中周期曲線的擬合問題，提出了雙傳感器軸向直線布置方法和基於自學習過程的信號處理方法，通過實驗，達到了顯示精度0 . 01mm ，測量重復精度0 . 2mm的良好效果。The aim of this paper is to search for a new type periodic slow - wave structure with filling periodically magnetized plasma, and following works are done : 1. firstly, the investigation of wave propagation characteristic in magnetized plasma with periodically changing density is done. by numerical calculation, analyze the effect of additional magnetic field and plasma density changing on the propagation characteristic
本文的目的是探索一種周期磁化等離子體慢波結構，並做了如下的工作: 1 .對電磁波在密度周期變化磁化等離子體中的傳輸特性進行了研究，通過數值計算分析了不同外加磁場以及不同等離子體密度情況下波的傳播特性。For a class of quasi - one - dimensional cluster, we study the effect of side spins on the spin - spin correlation on chain, our calculations show that the side spins added in the same sublattice can effectively strengthen the spin - spin correlation in large distance region and make the change tend to flat
計算證明，側自旋加進相同的子格中能有效地加強自旋關聯使得它在長距離范圍內的變化趨于平緩，而周期性地加入側自旋可以在基態中建立磁性長程序。Combined with the observational properties, we have constructed a theoretical model of a contact binary with a total mass of 1. 8 mo. our initial model is a detached binary in which the primary is very close to its roche lobe
並且由周期變化時標得到磁滯效應可能是引起wuma型相接雙星的角動量損失的主要物理機制。結合wuma型相接雙星的觀測特性，我們建立了一個總質量為1 . 8m 。The ocrs intensity with the periods of 32 - 64 hours increased remarkably for those events that ocrs intensity decreased before the geomagnetic storms, while the intensity of ocrs with the periods shorter than 24 - hour are not obvious
對于磁暴前銀河宇宙線強度減弱的事件，如1982年7月事件，周期為32 ? ? 64小時的信號幅度有較明顯的增強，而周期低於24小時的信號變化非常不明顯。Chaotic switching signal obtained from chua ' s circuit was used to control buck dc / dc converter. by compared the power spectrum of input current between chaotic modulations and classical pwm, it demonstrate that chaotic switching modulations have good effect on spreading power spectrum, which can be used to reduce the level of emi and to improve emc of smps
通過對四種混沌調制模式下變換器輸入電流與周期pwm模式下輸入電流頻譜的分析比較表明，混沌調制技術在擴展頻譜方面有良好的效果，可以用於降低開關模式電源的電磁干擾（ emi ）水平，改善電磁兼容性（ emc ） 。3. in order to show the fact that the - licrowave modulates the background plasma density and the density grating influences the propagation of the microwave in return, the dispersion relation of the dielectric cerenkov maser filled with plasma grating is derived when the modulation parameter is varied
三、為了反映等離子體被微波場調制從而形成密度周期性分佈的等離子體柵，反過來影響電磁波的傳播這一物理事實，在調制系數變化的情況下，從等離子體柵的等效模型出發，推導了等離子體柵填充的介質cerenkov脈塞的色散方程。3. more, the investigation of wave propagation characteristic in round waveguide filled periodically changeful plasma in density is done, by numerical calculation, to analyze the effect on the propagation characteristic when background plasma density and the amplitude of plasma density change
3 .研究了電磁波在填充密度周期變化等離子體金屬圓波導中的傳輸特性，通過數值計算分些了不同等離子體密度和背景密度情況下對波的傳播特性的影響The fast solution of the electromagnetic scattering problem using the periodic wavelet transform
用周期小波變換快速求解電磁散射問題In the design of real - time control system, the paper takes three - phase full - bridge mosfet inverter as the real - time control main circuit, and adopts a control scheme with 120 ? switching mode combined with half - bridge pulse width modulation ( pwm ), which would avoid straightthrough short of a certain bridge. phase current is detected by single current sensor ; three - phase position signals generated by position sensors could not only supply commutation information for inverter, but also be used for speed detecting based on signals " period measurement, which makes the speed sensor unnecessary. the whole control system adopts speed and current dual closed - loop control strategy in order to construct a high performance rare - earth permanent magnetic brushless dc motor ( repm bldcm ) full - digital real - time control system
在實時控制系統的設計中，本文以三相全橋mosfet逆變電路作為實時控制主電路，採用120導通方式結合半橋pwm調制的控制方案，從而有效地避免了橋臂的直通短路；本文用單電流傳感器實現對相電流的檢測，來自位置傳感器的三相位置信號不僅為逆變電路提供換相信息，而且也用於基於信號周期測量的轉速檢測，這樣就省去了速度傳感器；系統採用的是速度、電流雙閉環控制策略，力求構建高性能的稀土永磁無刷直流電動機全數字實時控制系統。分享友人