有效磁化率 的英文怎麼說
中文拼音 [yǒuxiàocíhuàlǜ]
有效磁化率
英文
effective susceptibility-
So the effect of eutrophication of dianchi lake of sediment ca n ' t be ignored. based on the research of modern sediemnt of dianchi lake, the thesis is concerned about some physical and chemical characteristics ( including magnetic susceptibility, ammoniac nitrogen and effective phosphprus etc. ) and thermodynamics analysis of spontaneous mineral of iron
本論文主要以滇池現代沉積物為研究對象，對滇池現代沉積物的主要物理和化學性質（包括氨氮、有效磷、磁化率等） ，進行基礎性地分析研究並對滇池現代沉積物鐵的自生礦物進行了熱力學分析。Based on the thorough investigation of the post - regulation and efficiency in multiple output switching - mode power supplies, an optimal combination topology for multiple output switching converter is presented in this thesis, which is consisted of forward converter with active clamp ( fac ), synchronous rectification ( sr ) techniques and magnetic amplifier technique ( magamp )
本文通過研究分析近年來多路輸出開關電源輔助輸出電壓調節和提高效率的方案，面對開關電源朝著輸出低電壓大電流方向發展的趨勢，提出多路輸出開關電源新的拓撲優化組合模式? ?有源鉗位正激變換器、同步整流技術、磁放大器。Hunan aero - magnetoelectricity co., ltd ( short for am following ) is a state - owned enterprise with production value of a hundred million yuan per year. with the expanding scale, converting operation system and more extensive competition, the corporation has more commands in information, and tries to improve the enterprise manage efficiency and lever even the core competition by the means of all - round carrying out the erp system, introducing advanced modernized management, optimizing and reforming the enterprise organizing structure and operation circuit
湖南航天磁電有限責任公司是一個年產值近億元的國有企業，隨著公司規模的不斷擴大，運行機制的轉變，市場競爭的加劇，公司對信息化的需求越來越高，希望通過實施erp系統，引入先進的現代化管理，對企業組織結構、業務流程的優化和組合，全面提高管理效率、管理水平，並最終提高企業核心競爭力。Secondly, according to the character of this kind of harmonic, the solutions of power filter are deeply analyzed and an optimized topology for series connected hybrid power filter is obtained. by pwm technique, midfrequency transformer and the principle of the magnetomotive force ( mmf ) compensation, the problem to the transfer of the low - frequency harmonic power compensatory signal in the series apf is solved, in technique
其次，針對acem系統特有的「電源諧波」特性，深入分析了濾波器方案，得到了一種適用於acem系統諧波抑制的串聯混合型有源電力濾波器優化拓撲結構，並採用了pwm調制技術、中頻注入變壓器和磁勢補償原理有效地解決了串聯apf中低頻諧波功率補償信號傳輸的難題。The raw materials, the composition, the time of milling, the calcining temperature, the different additives, the sintering temperature and the sintering parameters were investigated. the result showed : it was advantaged to obtain high initial permeability mnzn ferrite with stable frequency characteristic using high - purity raw materials ; in order to obtain mnzn ferrite with high properties, we must control strictly the composition ; it could improve the properties of mnzn ferrite by optimizing calcining temperature. the lower calcining temperature made the permeability higher, and the higher calcining temperature could promote the frequency characteristic of permeability ; we chosen the right time of milling according to the requirement of power diameter ; in order to improve the properties of mnzn ferrite, it is necessary to add effective additives. in this dissertation, the influence of bi2o3 、 moo3 、 k2co3 、 co2o3 were investigated ; the sintering temperature, the time of heat - retaining and sintering parameters were the key factors of preparing high permeability mnzn ferrites
研究結果表明:採用高純度的fe2o3有利於獲得高起始磁導率且頻率特性優良的鐵氧體;為了制備所需性能的鐵氧體，需要嚴格控制配方中各種原材料的含量，優化配方;由於粉體活性受預燒條件的影響，所以對不同要求的鐵氧體選擇的預燒條件就不一樣，適當降低預燒溫度有利於獲得較高的起始磁導率，而為了獲得良好的頻率特性可以適當地提高預燒溫度;根據對粉體顆粒粒徑的不同需求，可以選擇不同的球磨時間;而有效的添加劑是改善材料性能的必要條件，本文在添加劑的研究中主要對bi2o3 、 moo3 、 k2co3 、 co2o3的影響分別作了詳細地討論;燒結溫度、保溫時間和燒結氣氛是高磁導率mnzn鐵氧體制備最關鍵的工藝，適宜的燒結工藝可以獲得理想微結構和組成，從而得到高性能的鐵氧體材料;而從材料的微結構上來看，要提高材料的截止頻率，就要適當地細化晶粒、增加晶粒內部的氣孔。Based on the special property of magnetic fluid ( mf ), we fill the magnetic fluid into the working clearances of the servo valve torque motor. one side, the magnetized magnetic fluid can exert a damping torque on the torque motor armature and reduce vibration of the armature ; on the other side, it can improve the magnetic circuit efficiency of the torque motor because of the magnetic fluid ’ s larger magnetic permeability
基於磁流體所具有的特殊性質，將磁流體添加到伺服閥力矩馬達的工作間隙中，一方面磁流體被磁化后可增大銜鐵的阻尼力，減少振動;另一方面由於力矩馬達氣隙中磁導率的提高，使氣隙中的磁通量增大，力矩馬達的磁路效率和輸出扭矩將增大，因此可以提高力矩馬達的固有頻率和伺服閥的響應速度。In this paper, the authors used such geophysical exploration methods as the high - precision geomagnetic method, the resistivity profiling method and the induced polarization method to synthetically study the exhausted areas of the archean sedimentary metamorphic iron mines in eastern hebei, built an effective geophysical exploration combination model for the exhausted areas, and summarized the serviceability and validity of various geophysical exploration methods in the exploration of exhausted areas under different geological settings
摘要應用高精度磁法、電阻率剖面法、激發化法等常規地球物理勘查方法對冀東地區太古宙沉積變質鐵礦采空區進行綜合研究，建立冀東鐵礦采空區有效的地球物理勘查組合模型，總結不同地質環境條件下各種地球物理勘查方法在冀東鐵礦采空區勘探中的適用性和有效性。The stability of electric power system has been being focused for a long time toprevent a power system from losing synchronism after sudden fault ， researchers have done much work and got many accomplishments this paper applied the direct feedback linearization ( dfl ) technique on the power system ， a strong nonlinear system simulation results by matlab proved this method efficiency main works and results are as follows ： this paper compared some existing methods in excitation control ， fast valve control and coordinated control respectively, analyzed the developments and actuality of nonlinear control research in brief, illustrated why ransient stability could be greatly improved by using the fast valve control in chapter 3 ， indicated the importance of coordinated control farther this paper introduced the inverse system theory, based on which ， discussed the dfl theory, pointed out which had consistency with the inverse theory, expanded the dfl theory combined the idiographic model equations ， made which adapt to the model of a single machine - infinite bus power system this paper referenced abundance articles and educed a set of equations ， which could describe the dynamical process of excitation and fast valve control for synchronous generators in the equations ， there were several very important parameters of power system - - rotor angle ( ) ， rotor speed ( ) ， generator q axis voltage ( eq ) ， transient voltage ( e ' q ) ， active power ( pe ) ， mechanical input power ( pm ) ， valve opening ( ) ， generator terminal voltage ( vt ) ， based on the model ， nonlinear coordinated controller and terminal voltage optimal controller have been designed by using the expanded dfl theory and lq optimal control theory the simulation results showed that the controller could keep power system transiently stable under the effects of a symmetrical 3 - phase short circuit fault ， which achieved better postfault regulation compared with another two routine methods ， one is the proportion excitation controller and proportion fast valve controller, the other is the proportion excitation controller and the optimal fast valve controller, which could exert good performance when met 1ittle disturbance either
在介紹逆系統理論的基礎上，詳細介紹了dfl理論，通過比較闡明了dfl理論其本質是逆系統方法的一類，並結合具體課題推導出的模型方程將dfl理論進行了擴展，使之適應于電力系統這個強非線性對象。通過參考大量的書籍文獻推導出一套實用的可將大型汽輪發電機勵磁與汽門綜合起來進行控制的模型方程，此模型方程涵蓋了電力系統中特別引人注目的幾個量- -轉子角、轉子轉速、發電機q軸電勢eq 、暫態電勢e ' q 、有功功率pe 、機械功率pm 、汽門開度、機端電壓vt ，在此基礎上建立了實用的電力系統簡化的數學模型，並將擴展的dfl理論應用於此模型系統，結合線性二次型最優控制理論設計出大型汽輪發電機的非線性綜合控制器及機端電壓最優控制器，通過模擬實驗與採用常規的按電壓偏差進行調節的比例式勵磁控制器+汽門比例控制及採用常規的按電壓偏差進行調節的比例式勵磁調節器和基於二次型性能指標設計的最優快控汽門（考慮發電機的飽和因素）進行了對比，證實了採用此種控制器可以有效地提高電力系統的暫態穩定性，並且在電力系統遭受小干擾時同樣具有良好的調節性能。Measurements of the electrical conductivity of minerals and rocks from the earth ' s interior provide a powerful tool for probing physical and chemical properties and composition of the deep earth, and help us to interpret magnetotelluric data
模擬地球內部條件下的礦物、巖石電導率測量是了解地球內部物質組成及物理化學性質的有效手段，同時，還可以為野外大地電磁測量結果的解釋提供依據。Based on many references form civil and abroad, the author mainly studies the measurment theory and method for flux, raising height, axial power and rotational velocity. avoiding many complicated and intermediate courses for power wastage analysis, introduces the electric measurement and using efficiency curve of motor in measureing axial power, and satisfies the automatization of the device. the paper also provides a new method, inductive winding, in measuring rotational velocity of electromotor, supplys limitations of other method in measuring rotational velocity of electromotor in water, and meet practical needs in developing diving electric pump for corporation
作者在參閱大量國內外有關文獻，著重探討了水泵流量、揚程、軸功率、轉速的測試原理和測試方法，提出了採用電測法並結合電機效率特性曲線測量水泵軸功率，從而避免了損耗分析法中大量復雜的中間過程，滿足了試驗裝置的自動化測量要求；採用漏磁感應線圈法測量電機轉速，彌補了其它轉速測量方法對水下電機測試的局限性，適應了萊恩公司開發潛水電泵的實際需要。By successful solution of non - linear magnetic fields and revision of the program, we can reach following conclusions : in the computation of nonlinear magnetic fields, if iteration method is used, under - relaxation is necessary when amending the permeability distribution in soft magnetic materials ; and when < wp = 5 > calculating the equivalent current density in permanent magnets, under - relaxation is not a necessity ; when searching for permeability values by interpolation method on the demagnetization curve of soft magnetic materials, if a fixed saturation point is set, around this point an abrupt change of permeability values will be obtained ; this sudden change may cause a little problem in the smoothness of magnetic field distribution ; because the magnetic circuits of microwave tubes are too complicated, in the author ' s view, to describe the working state of a magnet system, the working points of magnets can not do it properly but average energy production of magnets will serve ; as to indicate the quality of a magnet system design for microwave tubes, the efficiency of magnetic energy utilization will be a very good criterion
由此得出結論，在非線性磁場計算中：採用迭代法的情況下，在各迭代循環之間進行磁導率修正時，一個欠鬆弛迭代過程是必需的；對永磁體中的等效電流修正時可以不作欠鬆弛迭代；在純鐵的磁化曲線上指定某一個固定的磁感應強度為磁飽和值，會使得插值求出的磁導率在該磁飽和值附近有一突變，這一突變對計算結果中磁場分佈變化的光滑性稍有影響。在微波管磁系統設計中，由於微波管磁路比較復雜，作者認為磁體的工作點並不能很好地反映磁體的工作狀態，而採用平均磁能積為衡量磁體工作狀態的標準更加符合微波管磁系統的實際情況；要表示磁系統設計好壞的程度，則用磁能利用的效率為標準更好。These particles will aggregate into a certain structure when the applied field yields a critical value. the other is fabricated from " half - metallic " oxides, i. e., ferromagnetic oxides which are predicted theoretically to be completely spin - polarized and really found experimentally to have very high spin - polarization. when a magnetic field is applied to half - metallic granular systems, the resistance will drop rapid and dramatically, which is called the extrinsic magnetoresistance effects in half - metallic granular systems
在磁性材料中，亦有由在理論上具有完全的自旋極化率、在實驗中也被證實具有高自旋極化率的一系列半金屬氧化物材料構成的多晶、粉末等顆粒體系，被發現能在外磁場下發生顯著的電阻下降，即半金屬氧化物顆粒體系中的外稟磁電阻效應。In the end, the thesis supplies the parameter of magnetic & susceptibility anomaly forecasting oil and gas reservoir and pointed out the association with the parameter and the compartmentalized oil & gas perspective region may improve the precision rate greatly in magnetic exploration searching oil and gas reservoir directly
油井資料驗證了磁性資料探測油氣藏結論，驗證結果表明了資料的有效性和劃分的合理性。由此，本文給出了磁異常? ?磁化率異常聯合預測油氣藏量化因子，指出此因子配合油氣遠景區圖示可以大大提高磁性指標直接探測油氣藏的準確率。2. the curve of median diameter well showed the grain - size characteristics of the area, which is negatively correspond with the curve of the susceptibility. the median diameter can be regarded as the effectively alternating indication of the environments in the paper
2 、中值粒徑曲線很好地反映了本地區的粒度特徵，並與磁化率曲線有很好的負向對應關系，所以本文把中值粒徑作為環境的有效替代指標。We describe how magnetic fluid ' s inner structure transforms with the time under all kinds of conditions using magnetic dipole model and magnetic chain model. and using effect field theory we analyze the mechanisms of the magnetic particles being chains, change of the chains and reciprocity in chains. so we can make out that the transmissivity varies with the magnetic fluid ' s inner structure
利用磁偶極子模型和磁鏈模型描述了磁性液體在各種條件下內部結構隨時間的變化，並用有效場理論解釋了磁性微粒成鏈，鏈的變化以及鏈間相互作用的機理，從而說明了由於磁性液體內部結構變化導致的光透射率的變化。The results showed that appropriate copolymer composition and processing techniques were fairly important in the preparation of composite magnetic microspheres. superparamagnetic magnetic composite microspheres with size less than 500nm, magnetic content 22 % and saturation magnetization 32. 5emu / g could be prepared by this novel method. it is proposed that the polymer
綜合看來，採用dpe法制備的磁性復合微球磁含量高、飽和磁化強度高、無機微粒分佈均勻，且表面潔凈，包覆效率高，因而具有更好的綜合性能，是一種具有廣闊應用前景的新方法。First, variable speed constant frequency wind energy convertion theory is described in this paper, then presents a review on the development of wind turbines control and the main types of generator and static converters used to interface variable speed wind turbines to the electric grid. then discuss main circuit constructure and advantage of direct drive wind energy conversion system and introduce pitch - control method for wind power traction and electric power stability. simply aerodynamic characteristic of the turbine is analysised and permanent magnet synchnonous generator math model is established. to convert the variable frequency electricity into utility grid, back to back four - quadrant pwm - vsi is used and three typies of control strategy is presented to capture the maximum wind energy and transmit energy. then simulation is implemented to test the control strategy. in the following chapter a simple ac - dc - ac converter with a dc - dc boosting chopper is proposed to transmit the wind energy into electricity energy and two control strategy is presented
建立了永磁電機和變流器的數學模型，針對雙pwm變頻器的特點提出了三種控制策略對變流器進行控制，通過變流器交-直-交的變換，將發電機發出的變頻變幅值交流電轉化為可用的恆定頻率的交流電，通過pwm調治能使其輸出功率因數為一，並且該控制系統功率因數為可調，能在特殊情況下同電網交換一定的無功功率，並通過對變流器的控制實現了最大風能俘獲的功能。最後採用matlab / simulink進行了模擬，取得了良好的模擬效果。在風力發電系統中，採用先進的最大功率俘獲演算法，能有效的從風中獲得最大的能量。The high - performance heat - reflective coated glass is also called sunlight control coated glass it is made by coating a number of metal or metal compaound films onto the high - quality float glass or other base glass with the vacuum magnetic control sputtering method, which can effectively control the reflection, transmission and absorption of solar energy, that is to say, this glass allows sufficient natural light to come in for daylighting, and can also reflect major part of sunlight irradiation to reduce the collection of indoor heat and lower down the expenses for ventilation and air conditioning ; furthermore, the transmission, reflection ratio and reflection color are ready for the selection by the users
高性能熱所射鍍膜玻璃也稱為陽光控制鍍膜玻璃，是在優質浮法玻璃或其他基片上用真空磁控濺射的方法鍍多層金屬或金屬化合物薄膜而成，可有效控制玻璃對太陽能的反射、透過和吸收，也就是說允許足夠的自然光進入室內用於採光，還能把大部分太陽光輻射熱反射掉，減少室內熱量的積聚，降低通風及空調的費用，而且可以根據客戶的需求，靈活選擇透過率，反射率及反射顏色。It will exert resistance and damping force to the torque motor armature, so that the dynamic performance, especially the stability, of flapper - nozzle servo - valve can be improved. the self - excited oscillations and noise can be removed. at the same time, as magnetic fluid has a higher magnetic permeability, the efficiency of torque motor magnetic circuit can be improved
由於磁流體具有的較大磁導率和較大的磁化強度，把磁流體添加到伺服閥力矩馬達的工作氣隙中，可提高伺服閥力矩馬達的磁迴路效率，增加伺服閥的阻尼，從而改善噴嘴擋板伺服閥的動態特性，抑制及消除其自激振蕩和噪聲。According to character of the magnetic data and susceptibility observation values, the thesis analyzes and deals with them by some reasonable methods, for instance the wavelet eliminating noise, the stepwise separated operator separating regional and local magnetic field, the foreboded statistics method distilling susceptibility background value
處理磁測和磁化率觀測值時，給出的多種合適的方法（如小波去噪方法、分離區域磁場和油氣局部磁場的逐次分離運算元以及提取黃土磁化率背景值的先驗統計提取法等）使數據的有效性顯著提高。分享友人