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On the Solvability of a Burgers-type Equation with a Specia Type of Nonlinearity
(Сибирский федеральный университет. Siberian Federal University, 2023-10)
problem (1), (2) the (weak approximation
τ)
in unknown
method [1] is used. Let us consider an auxiliary split problem with time shift t −
3
functions and non-linear terms
)
(
1
uτt (t, x) = 3a(t)uτxx (t, x), nτ < t 6 n +
τ;
(7)
3
(
)
(
)
(
)
(
τ
τ ) τ(
τ...
) τ 1 2 τ τ ut (t, x) = 3b t − , x, u t − , x , ω t − ux (t, x), n+ τ <t6 n+ τ ; (8) 3 3 3 3 3 ( ) ( ( ( τ τ ) τ )) 2 uτt (t, x) = 3f t − , x, uτ t − , x , ω τ t − , n+ τ < t 6 (n + 1)τ ; (9) 3 3 3 3 � uτ (t, x)�t60 = u0 (x). (10) Let us prove a priori...
) τ 1 2 τ τ ut (t, x) = 3b t − , x, u t − , x , ω t − ux (t, x), n+ τ <t6 n+ τ ; (8) 3 3 3 3 3 ( ) ( ( ( τ τ ) τ )) 2 uτt (t, x) = 3f t − , x, uτ t − , x , ω τ t − , n+ τ < t 6 (n + 1)τ ; (9) 3 3 3 3 � uτ (t, x)�t60 = u0 (x). (10) Let us prove a priori...
Properties of Solutions for the Problem of a Joint Slow Motion of a Liquid and a Binary Mixture in a Two-Dimensional Channel
(2018-07)
on temperature and concentration on the interface
σ(θ1, C) = σ0 − κ1θ1 − κ2C with constants σ0 > 0, κ1 > 0, and κ2.
We introduce the dimensionless independent variables ξ = x/l10, η = y/l10, and τ = ν1t/l210, as well
as velocities, modified pressures...
ξξ = 0, and the interface can only be a straight line. In what follows, we consider it parallel to the solid walls η = 0 and η = l2/l10, so that in the dimensionless variables its equation is η = 1. We seek a solution of (1) in the form uj = Uj(η, τ...
ξξ = 0, and the interface can only be a straight line. In what follows, we consider it parallel to the solid walls η = 0 and η = l2/l10, so that in the dimensionless variables its equation is η = 1. We seek a solution of (1) in the form uj = Uj(η, τ...
Система связанных маятников с управлением вертикальными осцилляциями
(Сибирский федеральный университет. Siberian Federal University, 2019-09)
единицам, сделав в (2) следующую замену:
tτ ω= , g
l
α = ,
2A
l
ωβ = ,
2kl
J
γ = . (3)
В итоге имеем следующую систему:
( )( ) ( )
( )
1 1 2 1
2 2 2 1
1 11 1 12
2 21 2 22
sign sin
0
(0) (0)
(0) (0)
ϕ α β τ ϕ γ ϕ ϕ
ϕ αϕ γ ϕ ϕ
ϕ ϕ ϕ ϕ
ϕ ϕ ϕ ϕ...
⎧ = + + −⎪⎨ = − − =⎪⎩ = = = = && && & & ,,,. (4) Перепишем (4) в виде системы дифференциальных уравнений первого порядка: ( ) 1 2 2 1 3 3 4 4 3 1 1 11 1 12 2 21 2 22 ( ) (0) (0) (0) (0) z z z p z z z z z z z τ γ α γ γ ϕ ϕ ϕ ϕ ϕ ϕ ϕ ϕ =⎧ ⎪ = +⎪⎨ =⎪ ⎪ = − +⎩ = = = = & & & & & & ,,, (5...
⎧ = + + −⎪⎨ = − − =⎪⎩ = = = = && && & & ,,,. (4) Перепишем (4) в виде системы дифференциальных уравнений первого порядка: ( ) 1 2 2 1 3 3 4 4 3 1 1 11 1 12 2 21 2 22 ( ) (0) (0) (0) (0) z z z p z z z z z z z τ γ α γ γ ϕ ϕ ϕ ϕ ϕ ϕ ϕ ϕ =⎧ ⎪ = +⎪⎨ =⎪ ⎪ = − +⎩ = = = = & & & & & & ,,, (5...
Nonlinear Methods for Analyzing the Statistical Dynamics of Tracking Systems in Radio Receivers
(2018-10)
] a joint statistical dynamics for DTS and PLL can be viewed in the coordinates
ˆφ φ φ= − ; ˆτ τ τp = − ,
where is the phase difference; p is the difference of the time position of the base and input signals;
ˆ ˆφ,τ are their values...
. The characteristics of tracking failure are determined using differential equations: ( ) ( ) ( ) ( ) ( )1 2 1 2 32 2 2 0 0 0 φ 4cosφ 4sinφ 8 αφ φ sin 2φ ; | τ | | τ | | τ | 1 1 1 τ τ τ p p p э э э d n t n t n t n t n t dt AT AT A...
. The characteristics of tracking failure are determined using differential equations: ( ) ( ) ( ) ( ) ( )1 2 1 2 32 2 2 0 0 0 φ 4cosφ 4sinφ 8 αφ φ sin 2φ ; | τ | | τ | | τ | 1 1 1 τ τ τ p p p э э э d n t n t n t n t n t dt AT AT A...
Creeping Three-dimensional Convective Motion in a Layer with Velocity Field of a Special Type
(Сибирский федеральный университет. Siberian Federal University, 2023-08)
. . .
The following notations are introduced
z
χ
; τ = 2 t; a∗ = max(| aj (t) |, | cj (t) |), j = 1, 2, u∗ = βa∗ lχ;
l
l
χ
∗
a(z, t) = a A(ξ, τ ); c(z, t) = a∗ C(ξ, τ ); θ(z, t) = a∗ Θ(ξ, τ ); f (z, t) = 2 ReF (ξ, τ );
l
χ
χ2
h(z, t) = 2 ReH(ξ, τ ); nj (t) = 4 Nj (τ...
P = ν/χ is the Prandtl number. After substituting (8) into system (6), (7), the initial boundary value problem in dimensionless form is obtained ∫ ξ Aτ + 2ReA(F + H) − 2ReAξ F (ξ, τ )dξ = Aξξ , 0 ∫ Cτ + 2ReC(F − H) − 2ReAξ ∫ Θτ − 2ReΘξ F (ξ, τ )dξ...
P = ν/χ is the Prandtl number. After substituting (8) into system (6), (7), the initial boundary value problem in dimensionless form is obtained ∫ ξ Aτ + 2ReA(F + H) − 2ReAξ F (ξ, τ )dξ = Aξξ , 0 ∫ Cτ + 2ReC(F − H) − 2ReAξ ∫ Θτ − 2ReΘξ F (ξ, τ )dξ...
Верификация математической модели процесса промерзания с уравнением сопряжения на подвижной границе
(Сибирский федеральный университет. Siberian Federal University., 2016-02)
phthfphthf
τ
ξ
n
t
λ
n
t
λ;ttt =
∂
∂
−
∂
∂
== ,
d
d
Q
n
t
n
t
ttt
phthfphthf
τ
ξ
λλ; =
∂
∂
−
∂
∂
==
=ξ⋅=′
f.ss
~
h A 0,20 м
2
=ξ⋅=′
f.ss
h Г 0,20 м
1
, не A, а Г; не показатель
степени м
2
, а сноска [2] (сноска «Физич-е вел-
ны …» внизу)
()
2
h...
τa Fo ⋅ = () 2 τ Fo h a⋅ = τ0,01τ h τ 2 ⋅= ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ξ ′ =′ f.s s τ0,01ττ 2 ⋅= ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ξ ′ =′ f.s s h ; y t λ τ t С, y t λ τ t С 2 2 2 2 ∂ ∂ = ∂ ∂ ∂ ∂ = ∂ ∂ ththff ;λ τ ,λ τ 2 2 2 2 y tt С y tt С ththff...
τa Fo ⋅ = () 2 τ Fo h a⋅ = τ0,01τ h τ 2 ⋅= ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ξ ′ =′ f.s s τ0,01ττ 2 ⋅= ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ξ ′ =′ f.s s h ; y t λ τ t С, y t λ τ t С 2 2 2 2 ∂ ∂ = ∂ ∂ ∂ ∂ = ∂ ∂ ththff ;λ τ ,λ τ 2 2 2 2 y tt С y tt С ththff...
Задачи идентификации коэффициентов для одной системы дифференциальных уравнений
(Сибирский федеральный университет, 2023)
= ∑ 𝜑𝑖 ,
𝑖=1
𝑗 = 1, … , 𝑙,
𝑖=1
где 𝜑 𝑖 – вектор-функции размерности 𝑙; 𝜑𝑗 , 𝜑𝑗𝑖 – 𝑗-е компоненты векторов 𝜑 и
𝜑 𝑖 соответственно.
Рассмотрим систему
𝑚
𝜕𝑢𝜏
= ∑ 𝛼𝑖,𝜏 (𝑡)𝜑𝑖 (𝑡, 𝑥, 𝑢̅𝜏 ),
𝜕𝑡
𝑖=1
где функции 𝛼𝑖,𝜏 (𝑡...
) определены соотношением 𝛼𝑖,𝜏 (𝑡) = { 𝑚, 𝑖−1 𝑖 ) 𝜏 < 𝑡 ≤ 𝑡0 + (𝑛 + ) 𝜏, 𝑚 𝑚 в противном случае, 𝑡0 + (𝑛 + 0, 𝑛 = 0,1, … , 𝑁 − 1; 𝜏𝑁 = 𝑡1 − 𝑡0 . Система (1.5) слабо аппроксимирует систему (1.4). 7 (1.5) �Далее, рассмотрим систему...
) определены соотношением 𝛼𝑖,𝜏 (𝑡) = { 𝑚, 𝑖−1 𝑖 ) 𝜏 < 𝑡 ≤ 𝑡0 + (𝑛 + ) 𝜏, 𝑚 𝑚 в противном случае, 𝑡0 + (𝑛 + 0, 𝑛 = 0,1, … , 𝑁 − 1; 𝜏𝑁 = 𝑡1 − 𝑡0 . Система (1.5) слабо аппроксимирует систему (1.4). 7 (1.5) �Далее, рассмотрим систему...
Энтропийные свойства мультипликативно-усеченных аппроксимаций эвентологических распределений
(Сибирский федеральный университет. Siberian Federal University., 2011-02)
reduction of the set of parameters
sufficient for characterization the E-distribution of the set of events X. The unit values of all
multicovariances τ (X) of subsets of events X ⊆ X, in which the power is greater than some fixed
value: |X| greaterorequalslant...
-truncated approximation hatwidep[N0], and [N0] any order N0 = 0,1,··· ,|X|, p[m] (X) = productdisplay Ym⊆X τ (Ym), X ⊆ X (3) emdash.cyr multiplicative-truncated projection of the order m of E-distribution p(X); {τ (Y ),Y ⊆ X} emdash.cyr multicovariances of E...
-truncated approximation hatwidep[N0], and [N0] any order N0 = 0,1,··· ,|X|, p[m] (X) = productdisplay Ym⊆X τ (Ym), X ⊆ X (3) emdash.cyr multiplicative-truncated projection of the order m of E-distribution p(X); {τ (Y ),Y ⊆ X} emdash.cyr multicovariances of E...
Solvability of BVPs for the Parabolic-Hyperbolic Equation with Non-linear Loaded Term
(Сибирский федеральный университет. Siberian Federal University, 2021)
of the Cauchy problem for equation
uxx − uyy + f2(x, y;u(x, 0)) = 0, at y < 0
with initial conditions u(x, 0) = τ(x), 0 6 x 6 1; uy(x,−0) = ,−(x), 0 < x < 1 can be
represented as follows:
u(x, y) =
τ(x+ y) + τ(x− y)
2
− 1
2
x−y∫
x+y
,−(t)yt− 1
4
x−y∫
x+y
yη
η∫
x...
+y f2 ( ξ + η 2 , ξ − η 2 ; τ ( ξ + η 2 )) yξ. (8) If we set a1(x) = a2(x) = a3(x) = 0 and a4(x) = ψ′2(x) then Problem I is a special case of Problem II. Then we will study the existence and uniqueness of solutions of Problem II. Using condition (7...
+y f2 ( ξ + η 2 , ξ − η 2 ; τ ( ξ + η 2 )) yξ. (8) If we set a1(x) = a2(x) = a3(x) = 0 and a4(x) = ψ′2(x) then Problem I is a special case of Problem II. Then we will study the existence and uniqueness of solutions of Problem II. Using condition (7...
Soft Tripled Coincidence Fixed Point Theorems in Soft Fuzzy Metric Space
(Сибирский федеральный университет. Siberian Federal University, 2023-06)
∗ be a H-type norm so that x ∗ y > xy. Consider 0 < τ < 1 and 0 6
α, β, γ 6 1 so that α+β +γ 6 1. Consider (Ῡ, ϖ, ∗) be a complete SFMS and G : Ῡ× Ῡ× Ῡ → Ῡ
and h : Ῡ → Ῡ be two functions so that G(Ῡ× Ῡ× Ῡ) ⊆ h(Ῡ) and h is continuous...
and commuting with G. Let for all ῑ, κ̄, λ̄, ē, f¯, ḡ ∈ Ῡ and ϱ > 0, (1) is satisfied, ϖ(G(ῑ, κ̄, λ̄), G(ē, f¯, ḡ), τ ϱ) > ϖ(hῑ, hē, ϱ)α ∗ ϖ(hκ̄, hf¯, ϱ)β ∗ ϖ(hλ̄, hḡ, ϱ)γ . (1) Then, G and h possess a unique soft tripled coincidence point. Moreover...
and commuting with G. Let for all ῑ, κ̄, λ̄, ē, f¯, ḡ ∈ Ῡ and ϱ > 0, (1) is satisfied, ϖ(G(ῑ, κ̄, λ̄), G(ē, f¯, ḡ), τ ϱ) > ϖ(hῑ, hē, ϱ)α ∗ ϖ(hκ̄, hf¯, ϱ)β ∗ ϖ(hλ̄, hḡ, ϱ)γ . (1) Then, G and h possess a unique soft tripled coincidence point. Moreover...