Results 11 to 20 of about 222,823 (148)
Advances in Difference Equations, 2020 Blended compact difference (BCD) schemes with fourth- and sixth-order accuracy are proposed for approximating the three-dimensional (3D) variable coefficients elliptic partial differential equation (PDE) with mixed derivatives.
Tingfu Ma, Yongbin Ge
doaj +1 more source
Қарағанды университетінің хабаршысы. Математика сериясы, 2019 One of the main and most studied problems in the theory of second order hyperbolic equations is a periodic boundary value problem. To solve such problems apply Fourier method, method of successive approximations, methods of functional analysis ...
N.T. Orumbayeva, A.B. Keldibekova
doaj +1 more source
Molecules, 2020 The aim of this study was to develop a prodrug of ubiquinol-10 (UqH-10), the active form of ubiquinone-10 (Uq-10), for oral delivery. Bioavailability of UqH-10 is hampered by its high susceptibility to oxidation and water-insolubility.
Shuichi Setoguchi +7 more
doaj +1 more source
Monotone and conservative difference schemes for elliptic equations with mixed derivatives
Mathematical Modelling and Analysis, 2004 In the paper elliptic equations with alternating‐sign coefficients at mixed derivatives are considered. For such equations new difference schemes of the second order of approximation are developed. The proposed schemes are conservative and monotone.
I.V. Rybak
doaj +1 more source
Derivation of a general mixed interpolation formula
Journal of Computational and Applied Mathematics, 1996 The author shows that given any function \(f(x)\), \(x > 0\), there exists a unique \(g(x) = au(kx) + bv(kx) + C_0 + C_1x + \dots + C_{n-2} x^{n-2}\) that interpolates \(f\) at the points \(jh\), \(h > 0\), \(j = 0\), \(1,\dots, n\), where \(u\) and \(v\) are the two linearly independent solutions of a suitable second-order ordinary differential ...
Chakrabarti, A, Hamsapriye, *
openaire +2 more sources
Holodilʹnaâ Tehnika i Tehnologiâ, 2023 The theory of differential equations is a powerful tool necessary for constructing mathematical models of various applied problems and their solution.
О.В. Троценко
doaj +1 more source
New Pyrazine Derivatives as Efficient Inhibitors on Mild Steel Corrosion in Hydrochloric Medium
Chemical Engineering Transactions, 2016 Novel pyrazine derivatives PD-1 were synthesized and their inhibitive action against the corrosion of mild steel in 15% HCl solution was studied by weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) studies ...
S. Zhang +7 more
doaj +1 more source
Abstract and Applied Analysis, 2013 In this paper, conservation laws for the (2+1)-dimensional ANNV equation and KP-BBM equation with higher-order mixed derivatives are studied. Due to the existence of higher-order mixed derivatives, Ibragimov’s “new conservation theorem” cannot be applied
Li-hua Zhang
doaj +1 more source
Mitigation of corrosion of carbon steel in acid medium using some antipyrine derivatives
Zaštita Materijala, 2017 Adsorption and inhibition efficiency of some antipyrine derivatives on the C-steel (CS) in 1M HCl were estimated using three electrochemical techniques (electrochemical impedance spectroscopy (EIS), electrochemical frequency modulation (EFM) and ...
Salam Abd Samar A. El +1 more
doaj +1 more source
International Journal of Electrochemical Science, 2019 The mixed electrolyte of acetic acid and boron trifluoride ethyl ether (BFEE), containing poly(ethylene glycol) with a molar mass of 1000 (PEG1000), was employed for the electrochemical synthesis of indole and its 5-position-substituted derivatives, such
Congcong Liu +5 more
doaj +1 more source