对于这个月月平均基本气流，进行正压不稳定度判据的检定，发现存在接近正压不稳定的条件。
The monthly averaged basic air current was approximately the barotropic instable condition which was measured by the meridional gradient of absolute vorticity.
探讨了特征向量在评估稳定性裕度的重要作用，指出了传统的对数衰减率与系统阻尼判据在评估轴承稳定性裕度时的局限性。
The important action of eigenvector in estimating stability margin is investigated, and the limitation of both system damping and logarithmic decrement criteria is pointed out.
导出解析形式的稳定性判据和章动阻尼时间常数，可用以估计卫星的稳定度。
The stability criteria and the decay time constant of the nutation damping are obtained in an analytical form, by which the degree of the attitude stability can bd evaluated.
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