Based on the physical meaning of each term in the linear parameter log I (a constant correlating the affinity of solut e t o stationary phase) of stoichiometric displacement model for retention o f solute, the thermodynamic characteristics of log I of solute in revers ed-phase liquid chromatography were investigated theoretically. This poi nt was tested by experimental data with two linear relationships:(1) plot of log I vs 1/T with apolar, polar small solut es and proteins;(2) plot of log I vs log Po/w (partition co effi cient of solute between n-octanol and water) with apolar and polar smal l solutes.

依據(jù)液相色譜中溶質(zhì)計量置換保留模型及線性參數(shù)log I(與1 mol溶質(zhì)對固定相的親和勢大小有關(guān)的常數(shù))裸体美女视频一区二区三区，通過作圖得知非極性和極性小分子溶質(zhì)及生物大分子的log I與絕對溫度的倒數(shù)1/T色播网址，以及小分子溶質(zhì)的log I與其在正辛醇-水中分配系數(shù)的對數(shù)log Po/w呈線性關(guān)系亚洲伊人天堂午夜网站，從兩方面進一步證明了log I具有熱力學平衡常數(shù)的性質(zhì)97久久盗摄。

By using this method, the angular frequency, amplitude, initial phase angle, decay constant of each component in transient voltage and/or current waveforms can be precisely extracted. Also, all other kinds of transient procedure can be analyzed by this method. Thirdly, a new definition of generalized instantaneous reactive power and generalized instantaneous reactive current in dq0 coordinates under any nonsinusoidal and unbalanced three-phase circuit is proposed for the first time. The detection and compensation method for different instantaneous reactive currents are also concerned.

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What this paper finished mainly work as follows: Five-phase hybrid step motor driver system with fixed-chopping frequency and constant total current driving is fully described. Mathematical model of the system, included the current control circuit, power driving circuit and five-phase hybrid stepping motor is established. The steady modeling of the system is established and studied. Based on the steady modeling of the system, dynamic modeling of the system is studied and single step response characteristic is constructed with MATLAB/Simulink. The simulation results, which is certified by the theory analysis, coincide with the theory analysis.

本文主要完成的工作包括幾個方面：對五相混合式步進電動機恒頻斬波恒總流驅(qū)動系統(tǒng)進行了完整的描述亚洲另类日韩；建立了包括電流控制電路、功率驅(qū)動電路以及五相混合式步進電動機在內(nèi)的恒頻斬波恒總流驅(qū)動系統(tǒng)的完整的數(shù)學模型ⅩXX欧美色com；基于MATLAB/Simulink建立了恒頻斬波恒總流驅(qū)動系統(tǒng)穩(wěn)態(tài)仿真模型国产黑丝视频，并進行了仿真；在建立其穩(wěn)態(tài)仿真模型的基礎(chǔ)上999久久久亚洲精品，對動態(tài)模型進行研究高潮少妇50p，并借助于MATLAB/Simulink工具建立了恒頻斬波恒總流驅(qū)動系統(tǒng)單步響應特性的仿真模型并對其單步響應特性進行了仿真研究，仿真結(jié)果與理論分析相符色色视频网。

The results indicate that the flow stress of the alloy increases with increasing strain rate and decreasing deformation temperature. The flow stress increases with increasing strain until the stress reaches the peak value, then the flow stress remains constant, which indicates that dynamic recrystallization happens during deformation. The flow behaviors are described by the hyperbolic sine constitutive equation, and the activation energy calculated is 337.75 kJ/mol. The as-forged microstructure consists of refined α2/γ and γ grains, and the grains are much homogeneous than before. The B2 phase distributes uniformly at the grain boundary of α2/γ and γ grains. The B2 phase decreases with increasing deformation temperature.

結(jié)果表明：流變應力隨著應變速率提高和變形溫度降低而增大国产国产人免费视频在线观看；在變形過程中，流變應力隨著變形量增大而增大日韩在线电影网中文字幕，當流變應力達到峰值后趨于平穩(wěn)www.欧洲视频在线，表明合金在變形過程中發(fā)生了動態(tài)再結(jié)晶；熱變形過程的流變應力可采用雙曲正弦本構(gòu)關(guān)系來描述国产免费高潮流白浆A片99，平均激活能為337.75 kJ/mol特技毛片；從合金的組織演化過程中可以看出，合金中不均勻的原始組織得到明顯均勻化国内自拍区在线下载视频免费观看网站，變形后的組織是由α2/γ層片晶團和γ晶粒組成的雙態(tài)組織日本公妇在线观看高清，在α2/γ層片晶團和γ晶粒的晶界交界處發(fā)現(xiàn)分布均勻的B2相，并且隨著變形溫度升高B2相數(shù)量逐漸減少日韩久久网A片。

The equilibrium molalities of ReO4(superscript -) were measured at ionic strengths from 0.1 to 2.0 molkg^(-1) in the aqueous phase and at constant initial molality of extractant in the organic phase at temperatures from 278.15 to

在N235+(NH4)ReO4+n-C7H16+HCl+H2O體系中在线综合网，在溫度278.15~303.15 K和離子強度0.1~2.0 molkg^(-1)范圍內(nèi)，以NH4Cl為支持電解質(zhì)中文字幕日本在线网，在HCl體系中測定了萃取平衡水相中ReO4濃度和pH值熟女毛片一区二区三区。

However, the monoclinic phase, with the lowest dielectric constant, is the stable phase under ambient condition.

然而在常溫常壓下單斜晶是最穩(wěn)定的結(jié)構(gòu)但是它的介電常數(shù)卻是最低的。

The results of computations show that the structure of unsteady flow is complex during both the acceleration phase and the constant velocity phase.

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The main content includes:B-Site , and substitutions greatly decrease the dielectric losses ofO3 system ceramics under electric field; because of the different characteristics of different ions and the influence of pyrochlore phase created in system, B-Site and ion substitutions increase the dielectric constant of the system, whereas ion substitutions decrease the dielectric constant of the system.

論文的主要研究內(nèi)容包括：B位中国一级特黄真人高清aa大片，及的取代均大大降低了O3體系陶瓷在電場下的介電損耗欧美三级一级69；由于各離子特性的不同及體系中生成的焦綠石相的影響，B位色中射网址，離子的取代使得體系的介電常數(shù)上升国产国爽视频，離子的取代卻使的體系的介電常數(shù)有所下降。

Study the first phase of this experiment by kinetic method, it shows this reaction isfirst-degree reaction. At 32℃,34℃,36℃and 38℃, each constant of reaction rate is 0.0042,0.0052, 0.0098 and 0.0146, and the constant of dynamics is pyramided by the hoist oftemperature.

第一階段化學反應為一級反應国产一区二区免费在线观看，在32℃性A片在线播放、34℃、36℃和38℃的化學反應速度常數(shù)分別為0.004291草白白色视频在线观看、0.005250岁女人一级A片免费、0.0098、0.0146三级片,A片免费在线观看，隨著溫度的升高91精品国精品国产自在久国产，化學動力學常數(shù)逐漸增大。

The existence ofpolar nanoregions dramatically influences the extrinsic dielectric nonlinearityof paraelectric phase. 5 Slow relaxations of field induced piezoelectricresonance of paraelectric barium stannate titanate were observed after eitherapplying or removing a DC bias field. This phenomenon is attributed to slowspace charge dipoles formed by injected homocharges and validated by theobservation of a negative piezoelectric constant. Isothermal study ondielectric constant and discharging current after application or removal of astep field were performed. The relaxation laws in ferroelectric andparaelectric phases are different. The transportation of homocharges arebelieved to be responsible for the strong relaxation behavior in paraelectricphase. Domain wall can trap space charges thus the relaxation in ferroelectricphase is relatively weak. Abnormal phenomena, such as slim-waisted hysteresisloops, abnormal C-V curves and clockwise reversible hysteresis loops observedin barium stannate titanate ceramics, were attributed to pinning of gatheredpoint defect on domain walls.

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