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On the other hand this dissertation develops a numerical model to calculate the Q-V characteristics of fast impulse corona, which is based on the relation to the interelectrode voltage, density of space charge and field intensity in corona region.

在计算方面,给出了冲击电晕特性的计算模型,该模型以电晕电极周围的电场强度、空间电荷密度与极间电压之间的宏观联系为基础,从时间和空间上将电晕发展过程离散化,可计及多层不同极性空间电荷的产生与变化,模型的待定参数由若干实测数据加以拟合。

The effect of interspace diffuse resistance for chitosanase's kinetic property is found larger than that of carrier's electrical property.

酶经固定化后所产生的空间扩散阻力对壳聚糖酶的动力学性质的影响要比在固定化过程中所用载体所带的电荷的极性对酶的动力学性质的影响大的多。

Objective: To explore the effect of interspace diffuse resistance and carrier's electrical property on immobilized chitosanase's kinetic property.

目的通过壳聚糖酶固定化前后最适宜的反应温度、pH值、米氏常数等动力学性质的变化研究载体电荷极性、空间阻力对壳聚糖酶动力学性质的影响。

The invention refers to a method to correct universal frequency of electric communication technique, its character: make signal index quantization on the complex number of cross product, to directly reflect the quantized numerical value of tangent value and the located quadrant of imaginary and real parts, use inverse tangent ROM table to discriminate the processed result, then make loop filter and phase accumulation on the discriminated result to obtain error-correcting angle, and use digital controlled oscillator to make table look-up and quadrant adjustment to obtain correcting factor; use the relationship of trigonometric function in each quadrant to compress inverse tangent look-up table ROM and digital controlled oscillator look-up table ROM.

一种涉及电通信技术的通用频率纠正的方法,其特征在于:它采用如下步骤:经过叉积的复数进行信号指数量化处理,通过该复数虚、实部信号的指数量化结果的差值及其极性直接反映虚、实部的正切值的量化数值以及所处象限,将处理后的结果通过反正切ROM表进行鉴频,鉴频后的结果经环路滤波和相位累加,得纠偏角度,通过数控振荡器针对纠偏角度进行查表和象限调整,得到纠正因子;通过个象限之间的三角函数关系来压缩反正切查表ROM和数控振荡器查表ROM的大小,本发明资源耗费小,效率高,可极大地节省内存资源。

The poison activity, stomach toxicity action and nonselective food refusal activity of extracts and fractions obtained by extracting the stem of Mirabilis jalapa L against the 4th instar larvae of Pieris rapae L, with 3 polarity solvents(petroleum ether, chloroform and ethanol)were determined by the methods of feeding, leaf-sandwich and leaf dish.

用饲喂法、叶片夹毒法、叶磲法测定了紫茉莉茎的3种极性溶剂提取物及萃取物对菜粉蝶幼虫的毒杀活性、胃毒作用、非选择性拒食活性。

Moreover, FSA-TFTs can effectively suppress the floating-body effect and parasitic bipolar junction transistor action compared with conventional TFTs.

而且,它可以有效地抑制浮接基体效应(floating-body effect)和寄生双极性接面电晶体效应(parasitic bipolar junction transistor action)。

Karyokinesis as increasing, especially the emergence of asymmetry, multi-polarity and setback, such as pathological karyokinesis when they have a diagnosis of malignant tumors.

核分裂像增多,特别是出现不对称性、多极性及顿挫性等病理性核分裂时,对恶性肿瘤具有诊断意义。

In source collision induced dissocation technique was used to study atrazine and diazionon,two pesticides with low volatility,high polarity and thermal lability.

气相色谱法和气相色谱质谱法在农药残留分析中广为应用,但在分析热不稳定、强极性和难挥发农药时往往需要结合衍生法。

Methods 9 kinds of macroporous resins with different polarities were used in the purification of the total flavonoids in Lignum Dalbergia odorifera.

选择9种不同极性的大孔吸附树脂,以降香总黄酮为指标,通过静态吸附和解吸附试验优选树脂,动态试验考察其纯化降香总黄酮的最佳工艺条件。

Methods 9 kinds of macroporous resins with different polarities were used in the purification of the total flavonoids in Lignum Dalbergia odorifera.Results HPD100 macroporous resin was better in purification of the total flavonoids.

选择9种不同极性的大孔吸附树脂,以降香总黄酮为指标,通过静态吸附和解吸附试验优选树脂,动态试验考察其纯化降香总黄酮的最佳工艺条件。

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