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11.
Enzyme sensors for urea and creatinine were developed by coupling an ammonia gas-diffusion electrode with triacetate cellulose membranes entrapping urease or creatinine deiminase enzymes. Satisfactory results were obtained by using these sensors both in standard solutions and in authentic biological matrices. 相似文献
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This is the first of two papers on the zero-viscosity limit for the incompressible Navier-Stokes equations in a half-space.
In this paper we prove short time existence theorems for the Euler and Prandtl equations with analytic initial data in either
two or three spatial dimensions. The main technical tool in this analysis is the abstract Cauchy-Kowalewski theorem. For
the Euler equations, the projection method is used in the primitive variables, to which the Cauchy-Kowalewski theorem is directly
applicable. For the Prandtl equations, Cauchy-Kowalewski is applicable once the diffusion operator in the vertical direction
is inverted.
Received: 5 September 1995 / Accepted: 14 July 1997 相似文献
13.
We consider a 2D vorticity configuration where vorticity is highly concentrated around a curve and exponentially decaying away from it: the intensity of the vorticity is O(1/ε) on the curve while it decays on an O(ε) distance from the curve itself. We prove that, if the initial datum is of vortex-layer type, Euler solutions preserve this structure for a time that does not depend on ε . Moreover, the motion of the center of the layer is well approximated by the Birkhoff-Rott equation. © 2020 Wiley Periodicals, Inc. 相似文献
14.
Conservative methods for the Toda lattice equations 总被引:1,自引:0,他引:1
We are concerned with the numerical integration of the Todalattice equations by using different conservative methods. Numericalexperiments suggest that the global error for isospectral schemesdecreases exponentially with time but it is almost constantfor either symplectic or more general integrators. We providea theoretical explanation for these experimental findings. 相似文献
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Emanuele Dell’Aglio Susanne Heidi Plattner Maria Pia Sammartino Giovanni Visco Luigi Campanella 《Natural product research》2019,33(7):1026-1033
AbstractResearch in restoration and conservation is directed vs. more sustainable working materials, methods and technologies. Electrophoretic removal, from porous material, of undesired stains due to charged species is theoretically an interesting alternative to chemical cleaning methods, but the lack of specific and comprehensive research work leads to controversial opinions about the efficiency and the needed harmfulness for the treated objects. In this work paper, samples with artificial rust stains were subjected to electrophoretic cleaning treatments in mineral water as electrolyte. Treatments were carried out either in a bath by complete sample immersion between the distanced electrodes or by sample wetting and sandwiching between the electrodes. Evaluation of cleaning efficiency and treatment effects was based on colour change measurements (image analysis of scanned paper samples before and after the treatment and by colorimetric data via spectrophotometric measurements), investigation of morphological changes by SEM observations and folding endurance measurements. 相似文献
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