nurture
发表于 2025-3-26 23:15:17
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敬礼
发表于 2025-3-27 04:12:08
Gary Webb needed to better understand the magnitude and direction of environmental change related to both natural and anthropogenic causes, as well as to assess patterns of natural variability. The paucity of instrumental data requires that proxy methods be used. The abundance of lakes throughout the Arctic
矛盾
发表于 2025-3-27 07:54:41
Gary Webb needed to better understand the magnitude and direction of environmental change related to both natural and anthropogenic causes, as well as to assess patterns of natural variability. The paucity of instrumental data requires that proxy methods be used. The abundance of lakes throughout the Arctic
健忘症
发表于 2025-3-27 09:58:39
Gary Webbl data are needed to better understand the magnitude and direction of environmental change related to both natural and anthropogenic causes, as well as to assess patterns of natural variability. The paucity of instrumental data requires that proxy methods be used. The abundance of lakes throughout t
连锁
发表于 2025-3-27 16:34:41
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VEST
发表于 2025-3-27 18:23:50
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纪念
发表于 2025-3-28 01:42:01
Introduction,for systems of differential equations governed by an action principle. Noether’s theorem applies to systems of Euler-Lagrange equations that are in Kovalevskaya form (e.g Olver (1993)). For other Euler-Lagrange systems, each nontrivial variational symmetry leads to a conservation law, but there is n
有常识
发表于 2025-3-28 03:12:44
Helicity in Fluids and MHD,uid mechanics, we derive the helicity conservation law for the helicity density .. = . ⋅., where . = ∇×. is the fluid vorticity. The integral . over a volume .. moving with the fluid, is the fluid helicity. It is important in the description of the linkage of the vorticity streamlines (e.g. Moffatt
全国性
发表于 2025-3-28 09:05:17
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脆弱吧
发表于 2025-3-28 12:04:35
Topological Invariants,that are non-zero are sometimes referred to as topological charges. A more complete discussion is given by Tur and Yanovsky (J. Fluid Mech. 248:67–106, 1993). Topological fluid dynamics and invariants are discussed in more detail in Arnold (Sel. Math. Sov. 5(4):326–345, 1986), Arnold and Khesin (Top