种差异

Based on varying process of generator terminal parameters after excitation fault, shortages of excitation protective principle of static stability boundary and asynchronous impedance boundary are analyzed. It proposed that excitation fault research relates to large-disturbance stability. Because dynamic power-angle character of generator after excitation fault is non-sinusoidal, there are differences between dynamic power-angle character and static state power-angle character. So it isn't ideal to protective operation result based on small-disturbance stability and static stability boundary criterion. At the same time, it proposed that asynchronous boundary impedance criterion is a constant reactive power circle moving adown j Xd′. It can ensure complete loss-of-excitation generator measuring impedance enter into the circle, but can't ensure the other condition measuring impedance including impossible losing synchronism enter. So loss-of-excitation protection would be maloperation when system voltage drops short and recovers or generator rejects load.③Based on stability principle, it puts forward setting conditions and calculation method of generator loss-of-excitation protection by direct measuring power-angle.

以励磁故障后发电机端的相关参数的变化为基础，通过对以静稳定边界和异步阻抗边界作判据的两类三种现行励磁保护在原理上存在的缺陷分析，发现：励磁故障是一个大干扰稳定性问题，励磁故障后的发电机的动态功角特性与静态功角特性有很大的差异，已远非正弦曲线，因此基于小干扰稳定性原理、以静稳定边界作判据的保护必然动作不理想；异步边界阻抗判据是一个下移j Xd′的等无功阻抗圆，它可以保证完全失磁后的发电机测量阻抗能进入该阻抗圆，但不能保证完全失磁之外的其它状态不会进入该阻抗圆，因此在系统电压短时下降或发电机突然甩负荷等情况下可能启动该保护使之误动。

MATERIALS AND METHODS The clinical data of 47 cases of patients Underwent laparoscopic adrenectomy and 10 cases of patients underwent open adrenalectomy were analyzed retrospectively.

回顾分析47例腹腔镜肾上腺髓质脂肪瘤切除术和开放肾上腺髓质脂肪瘤切除术的临床资料，统计分析这两种术式在手术时间、术中出血量、术后肠功能恢复时间、术后住院时间及并发症发生率等的差异。

Results There were differences in shape and layers of velamen cell, number of xylem bundles, maximum diameter of vessels, organization of pith, as well as the types, quantity, and size of crystals. D. fimbriatum could be distingushed from its adulterant species D.

结果根被细胞的形状及皮层厚度，中柱的木质部束数、导管的直径、髓的构成，晶体的类型与大小存在种间差异。

Results showed that the amount of iron plaque and arsenic concentration in iron plaque were significantly affected by the aerenchyma tissue.

采用土壤盆栽试验方法，比较了两种通气组织结构不同的水稻品种（扬稻6号和农垦57）根表铁膜的形成及其吸收积累As的差异。

The results showed that TPS was of the best accuracy of three methods for temperature, precipitation and relative humidity, significantly for air temperature and precipitation. The difference of the accuracy of three interpolation methods for the aestival relative humidity was not significant.

结果表明：薄盘光滑样条函数法的插值精度最优，特别是温度和降水的效果尤其明显；对于三种插值方法，相对湿度的插值精度在夏季差异不明显。

The results show that the frequencies of both the agenesis and impaction of third molar are much higher in East Asian populations than all other populations around the world.

这一特征在居住于不同的地理区域的人类始发的时间及增加的速率不尽一致。结果造成了种族群体之间的差异。而第三臼齿阻生则是退化的另一种表现形式，但影响第三臼齿阻生的因素更为复杂。

Manchu language already changed into analytic language,while Oroqen remains agglutinative.

满语和鄂伦春语同属阿尔泰语系满—通古斯语族，但由于分化的年代久远，两种语言的类型已经有了差异，满语从粘着语逐渐走向分析语，而鄂伦春语仍然是典型的粘着语。

Results: The rate of cancer transformation in 1023 Recipe treated group was lower than that in the control group without treatment (P.05). Agglutinin receptors in the two groups were different significantly.

结果：1023中药合剂用药组的仓鼠癌变率明显低於不用任何药物的对照组(P.05)。1023中药合剂用药组的2种凝集素受体表达与对照组有明显差异。

These results indicated that there might exist some differences in the toxicity mechanisms of Ala and Alb

本实验结果显示两种形态的铝对植物的致毒机理可能存在一定差异。

The invention can repeatedly test the CT vessel contrast rebuild algorism quantitatively, to find out best parameter.

本发明便于操作和重复定量执行地检测CT血管造影术重建算法，以判断不同重建算法的优劣或同一种算法在不同的参数条件下的性能差异，进而找出最佳参数设置。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。