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71.
Doina Cioranescu Patrizia Donato Horia I. Ene 《Mathematical Methods in the Applied Sciences》1996,19(11):857-881
We study the Stokes system with non-homogeneous Fourier boundary conditions depending on a parameter, in a domain with periodic inclusions of the size of the period. Following the values of this parameter, we obtain at the limit a Darcy's law, a Brinkmann type equation or a Stokes type equation. We also present a physical model to which the results apply. This model describes the flow of an incompressible viscous fluid through a porous medium under the action of an exterior electric field. 相似文献
72.
73.
We analyze the inversion of the Laplace transform in UMD-spaces
for resolvent families associated to an integral Volterra equation of convolution
type.Received: 25 March 2002 相似文献
74.
Doina Bejan Ecaterina Cornelia Niculescu 《The European Physical Journal B - Condensed Matter and Complex Systems》2016,89(6):138
We investigated the combined effects of a non-resonant intense laser field and a static electric field on the electronic structure and the nonlinear optical properties (absorption, optical rectification) of a GaAs asymmetric double quantum dot under a strong probe field excitation. The calculations were performed within the compact density-matrix formalism under steady state conditions using the effective mass approximation. Our results show that: (i) the electronic structure and optical properties are sensitive to the dressed potential; (ii) under applied electric fields, an increase of the laser intensity induces a redshift of the optical absorption and rectification spectra; (iii) the augment of the electric field strength leads to a blueshift of the spectra; (iv) for high electric fields the optical spectra show a shoulder-like feature, related with the occurrence of an anti-crossing between the two first excited levels. 相似文献
75.
Magnetic nanoparticles and concentrated magnetic nanofluids: Synthesis, properties and some applications 总被引:2,自引:0,他引:2
Ladislau Vékás 《中国颗粒学报》2007,5(1):43-49
This paper reviews some recent results concerning chemical synthesis of magnetic nanoparticles and preparation of various types of magnetic nanofluids. Structural properties and behaviour in external magnetic field of magnetic nanofluids will be emphasized with relation to their use in leakage-free rotating seals and in biomedical applications. 相似文献
76.
77.
Subash C. Pakhrin Kiyoko F. Aoki-Kinoshita Doina Caragea Dukka B. KC 《Molecules (Basel, Switzerland)》2021,26(23)
Protein N-linked glycosylation is a post-translational modification that plays an important role in a myriad of biological processes. Computational prediction approaches serve as complementary methods for the characterization of glycosylation sites. Most of the existing predictors for N-linked glycosylation utilize the information that the glycosylation site occurs at the N-X-[S/T] sequon, where X is any amino acid except proline. Not all N-X-[S/T] sequons are glycosylated, thus the N-X-[S/T] sequon is a necessary but not sufficient determinant for protein glycosylation. In that regard, computational prediction of N-linked glycosylation sites confined to N-X-[S/T] sequons is an important problem. Here, we report DeepNGlyPred a deep learning-based approach that encodes the positive and negative sequences in the human proteome dataset (extracted from N-GlycositeAtlas) using sequence-based features (gapped-dipeptide), predicted structural features, and evolutionary information. DeepNGlyPred produces SN, SP, MCC, and ACC of 88.62%, 73.92%, 0.60, and 79.41%, respectively on N-GlyDE independent test set, which is better than the compared approaches. These results demonstrate that DeepNGlyPred is a robust computational technique to predict N-Linked glycosylation sites confined to N-X-[S/T] sequon. DeepNGlyPred will be a useful resource for the glycobiology community. 相似文献
78.
79.
Doina Bejan 《Analytica chimica acta》1999,390(1-3):255-259
The paper describes the determination of the molybdenum content in white wines based on its catalytical action on the kalium iodide oxidation by hydrogen peroxide in acid medium.
The optimum reaction conditions (the catalyst, KI and H2O2 concentrations, the pH value, the order of the reagent additions, the temperature) have been found by studying the effect of the reaction variables.
The influence of some metallic ions (Ca2+, Mg2+, Zn2+, Cd2+, Fe2+ and Fe3+) and complexing anions (F−, C2O2−4, EDTA4−) on the catalyzed reaction rate was elucidated.
The molybdenum concentration was estimated by the tangent, fixed-time and fixed-absorbance method. The obtained average values for molybdenum content in white wines are within the 1.77×10−7–1.83×10−7 mol l−1 range. 相似文献
80.
Gheorghe Zet Camelia Popa Doina Partenie 《理论物理通讯》2007,47(5):843-846
We use the theory based on the gravitational gauge group G to obtain a spherical symmetric solution of the field equations for the gravitational potentials on a Minkowski space-time. The gauge group G is defined and then we introduce the gauge-covariant derivative Dμ. The strength tensor of the gravitational gauge field is also obtained and a gauge-invariant Lagrangian including the cosmological constant is constructed. A model whose gravitational gauge potentials A^α μ (x) have spherical symmetry, depending only on the radial coordinate τ is considered and an analytical solution of these equations, which induces the Schwarzschild-de-Sitter metric on the gauge group space, is then determined. All the calculations have been performed by GR Tensor II computer algebra package, running on the Maple V platform, along with several routines that we have written for our model. 相似文献