right-atrium
发表于 2025-3-28 15:45:47
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发誓放弃
发表于 2025-3-28 21:03:45
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放逐某人
发表于 2025-3-29 00:55:30
,Physical significance of Nöther’s symmetries and extremum principles, on a set of the functions, the function on a set of the numbers. More precisely, let Q will be the set of functions; q, r, s …; then a functional A defined on Q is a mapping A: Q → R. which associates to each q ∈ Q a real number A(q). In general, the set of the functions may constitute any set of geometric objects, scalars, vectors, tensors, etc.
Obliterate
发表于 2025-3-29 07:08:32
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无关紧要
发表于 2025-3-29 08:50:57
Eulerian and Lagrangian descriptions of perfect fluids,bsystem with sufficiently large number of molecules to allow macroscopic definitions of thermo-hydrodynamic variables. Here we consider a single-component fluid with the density p, the specific entropy s, and the velocity . in the Eulerian coordinates. This fluid is called the perfect fluid if it do
TIA742
发表于 2025-3-29 14:51:25
Conservation laws for given system of equations,roperties of solutions and to determine physical quantities which are constant in time. Therefore finding the conservation laws is an important problem, encountered in fluid mechanics and nonequilibrium thermodynamics of continua.
Ledger
发表于 2025-3-29 16:19:15
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neutrophils
发表于 2025-3-29 23:42:04
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encomiast
发表于 2025-3-30 00:29:06
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