The joint effect of active and reactive power on the voltage stability of a typical power system was considered by analysing the two parameter bifurcation problem related to nonlinear oscillation phenomena. Numerically, as the active power P1 increases, the Hopf points get closer and eventually coincide at P1=1.455 43 the cyclic fold curve gets closer and closer to the Hopf curve and finally intersects the Hopf curve at a singular point the period-doubling points also get closer and finally coincide at P1≈0.65. The stability behaviour is pre-determined using the normal form approach near the limit point of the Hopf curve. Hence, in the power system attention should be paid to both the consumption of active power and the decrease in the reactive power to prevent nonlinear oscillations. A controller can be designed to absorb some active power and to avoid the nonlinear oscillations that damage the system components.

針對一個典型的單機無窮大電力系統(tǒng)，通過分析系統(tǒng)的雙參數(shù)分岔的非線性振蕩現(xiàn)象国产偷窥真人视频在线观看，綜合考慮有功和無功功率對電壓穩(wěn)定性的影響數(shù)值分析表明高清不卡在线免费av，隨著有功功率的增加国产精品特级女人18毛片A毛片，電力系統(tǒng)的Hopf點越來越靠近五月欧美色图日本激情，最終合為一點在P1=1.455 43處同時圈折cyclic fold 曲線也越來越靠近Hopf曲線免费乱伦无码免费观看网站，并在Hopf曲線的穩(wěn)定與不穩(wěn)定臨界點處與Hopf曲線相交倍周期分岔點也隨著越來越靠近，最終在P1≈0.65 合為一點應(yīng)用正規(guī)形理論方法亚洲全黄无码一级，初步確定了Hopf曲線極限點附近的穩(wěn)定性態(tài)因而a片在线播放免费网址，電力系統(tǒng)應(yīng)注意讓負荷利用有功功率，減少無功功率的產(chǎn)生以防止非線性振蕩另外非洲亚干操射，可以設(shè)計一個稍微吸收網(wǎng)絡(luò)的有功功率的控制器2021国产精品露脸在线，以避免因周期振蕩而造成電力系統(tǒng)儀器的損壞或電壓崩潰

The query system can implement function as follows, searching of single well curve, searching of multiple well curve, and parallel moving of curve, and adjusting of well, and adjusting of curve, and displaying of graph of single well, and saving documents as the DXF format.

該查詢系統(tǒng)所能完成的主要功能有單井曲線查詢、多井曲線查詢黄A片欧美一区在线视频观看、表格瀏覽国产精品高清无码、曲線平移、井位調(diào)整97超碰奶水十足精品网站、曲線調(diào)整H漫无遮挡全彩纯肉动漫、以及將曲線保存為DXF格式的文件。

For drawing the parameter curve by point to point it orde to the parameter t's step length of increased make the progress range of the curve can not large than the length of one pels, otherwise the curve may step over one middle pels and skip one point that it should be on the curve.

要逐點地生成參數(shù)曲線自拍视频日韩视频在线观看免费，就要求參數(shù)t每次增加的步長要使曲線前進的幅度不得超過一個象素長度先锋资源网站在线，否則有可能跨過一個中間象素而產(chǎn)生斷點。

First, a smooth curve is obtained from the data by curve fitting with the method of non-linear least squares fit. Then the tangent vector and the radius of curvature of each point on the curve can be calculated for the error evaluation. With the fitted curve, the focusing state of the aspheric lens can be obtained by the method of ray tracing.

主要過程為首先采用非線性最小二乘擬合的方法進行曲線擬合又大又黄又爽又色的视频，并計算出曲線上各點的切矢量和曲率半徑永久免费的毛片视频网站，分析它們的誤差，最后對擬合后的曲線用光線追跡的方法得到非球面鏡的聚焦情況9999在线观看视频免费。

Based on the example of turbine reverse engineering , the general procedure that can be used to translate the physical object into CAD datum by Surfacer software is determined in this paper1 By going deep into the vector of point-cloud , it's parametrization can be gained by adopting the precept of accumulating chordal parametrization1 According to the principle of const ructing curve using the least square method , the high quality-curve can be gained by modifying curve's parameter1 This paper also empha2sizes on some methods about processing point-cloud , const ructing curve and const ructing surface1 And it can provide several methods to const ruct high quality2CAD model for mould machining1

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The horizontal and vertical first derivatives of magnetic anomalies of an infinite cylinder are calculated by the cosine transform method, in which the maximum errors are -0.28 nT/m and 0.47nT/m, respectively and the percent errors are generally within -3.57%~3.27% and -1.94%~1.88%, respectively except several data of the boundary and part are bigger because of remains of Gibbus effect. The calculating curve and theoretical curve are approximately coincident, and there is no influence by effective magnetic dip angle in computing. But the errors with the Fourier transform method are -10.62nT/m and 14.42nT/m, there is large departure between the calculating curve and theoretical curve and evident influence by effective magnetic dip angle in computing.

利用余弦變換法計算的無限長水平圓柱體磁異常水平和垂向一階導(dǎo)數(shù)的最大誤差分別為-0.28nT/m、0.47nT/m热99在线精品免费观看高清；水平一階導(dǎo)數(shù)的誤差一般在-3.57%~3.27%之間欧系a片黄片，垂向一階導(dǎo)數(shù)的誤差一般在-1.94%~1.88%之間美女视频黄色网；計算的磁異常一階導(dǎo)數(shù)值與理論值大致重合，而且不受有效磁化傾角的影響而Fourier變換法計算的水平和垂向一階導(dǎo)數(shù)最大誤差分別為-10.62nT/mwww.fxjy888.com、14.42nT/m欧美在线888，計算曲線與理論曲線偏離大，受磁化傾角的影響也較大国产精品自在线拍国产不卡。

Results: The renal perfusion was increased in diabetes group after the injection of alloxan. The PSI, AUC and ascending slope rate of the curve of the time-intensity curve were increased in 1w and 2w with decreased of HPT; the pathological examination exhibited glomeruli hypertrophy and no thickening of basal lamina. The PSI and AUC in 4w and 6w were more than that of control group; the PIT and ascending slope rate of the curve got closed to normal in 4w and 6w; the intercapillary cells increased. The speed of ascending slope rate of the curve in 8w, 10w and 12w was slower, shown as PIT and HPT delayed; the pathological examination showned increasing of mesangial cell, hyperplasia of mesangial matrix and thickening of basal lamina, followed with obliteration of partial micrangium, glomerular sclerosis and reduce of PSI in 12w.

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Based on the theories of rheology, Non-Newtonian Fluid Mechanics, petroleum chemistry, crystallography and pipeline technology etc. and sampling Huabei crudes, experimental indexes and programmes are drew out, integrating the oil properties and parameter analysis; in terms of the macro analysis of continuum mechanics, substantial experiments are conducted with HAAKE RS600 rotational rheometer and the rheological equation as well as the viscosity-temperature equation are further developed with tested rhrogramme and viscosity-temperature curve, respectively. Beased on the researches on thixotropic mechanism and thixotropy fluid property, hysteresis loop curve, structure failure and viscosity build-up curve as well as shear stress decrement curve for one type oil are first present in this paper. According to the theoretical researches and testing results, a novel thixotropy equation with τ=τ_∞e~ pattern, which is of hi-accuracy, few parameter and simplicity, is developed. Considering the influence of various parameters on rheological behaviour, depressant adding condition is optimized and experimental evaluation on BEM-5P is conducted, which further unrip its mechanism on the Huabei crude. A corresponding viable pipe transportion programmel is also recommended.

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Based on the theories of rheology, Non-Newtonian Fluid Mechanics, petroleum chemistry, crystallography and pipeline technology etc. and sampling Huabei crudes, experimental indexes and programmes are drew out, integrating the oil properties and parameter analysis; in terms of the macro analysis of continuum mechanics, substantial experiments are conducted with HAAKE RS600 rotational rheometer and the rheological equation as well as the viscosity-temperature equation are further developed with tested rhrogramme and viscosity-temperature curve, respectively. Beased on the researches on thixotropic mechanism and thixotropy fluid property, hysteresis loop curve, structure failure and viscosity build-up curve as well as shear stress decrement curve for one type oil are first present in this paper. According to the theoretical researches and testing results, a novel thixotropy equationwith τ=τ_∞e~ pattern, which is of hi-accuracy, few parameter and simplicity, is developed.Considering the influence of various parameters on rheological behaviour, depressant adding condition is optimized and experimental evaluation on BEM-5P is conducted, which further unrip its mechanism on the Huabei crude. A corresponding viable pipe transportion programmel is also recommended.

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The results indicated that the lysing curve of host cells was consistent with the one step growth curve of cyanophage, thus it was more convenient to substitute measuring the lysing curve of host cells for the one step growth curve measurement of cyanophage.

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