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In this paper, we investigate the dynamics of Born–Infeld (B–I) phantom model in the ω–ω′ plane, which is defined by the equation of state parameter for the dark energy and its derivative with respect to N (the logarithm of the scale factor a). We find the scalar field equation of motion in ω–ω′ plane, and show mathematically the property of attractor solutions which correspond to ω
φ
∼−1, Ω
φ
=1, which avoid the “Big rip” problem and meets the current observations well.
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本文针对新型便携式行业级无人机精灵4RTK开展了实测数据的定位精度分析,从有、无控制点情况下的绝对定位精度和无控制点情况下的相对定位精度2方面入手,详细计算后者水平距离和高程差的测量误差,探讨网络RTK技术的无控制点情况在活动构造中的应用。结果表明,无人机精灵4RTK在天气较晴朗、飞行高度100 m、镜头角度正射向下、旁向和航向重叠率均为70%等实测条件下,有控制点情况下水平位置和高程测量误差均<4.5 cm,无控制点情况下水平位置测量误差<0.60 m、高程测量误差<1.90 m;无控制点情况下,当实际水平距离<300 m时,水平距离测量误差<0.100 m,当高程差<2.8 m时,高程差测量误差<0.100 m;以复合运动性质的发震断层为例,初步探讨认为无人机精灵4RTK的网络RTK技术在无控制点情况下提取活动构造的定量参数时,其水平位移量精度能够达到厘米级,垂直位错量精度可能达不到厘米级,当垂直位错量小于8.0 m时,精度能够达到0.157 m。 相似文献
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In this paper, dilaton in Weyl-Scaled induced gravitational theory is regarded as a candidate of dark energy. When the potential of dilaton field is taken as the form of a double exponential , we find that there exist attractor solutions in dilatonic dark energy model, and these attractors correspond to an equations of state and a cosmic density parameter , which are important features for a dark energy model that can meet the current observations. We find out the sufficient condition of the existence of a late time de Sitter attractor. 相似文献
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