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Presents a study on the effects of grain size distribution on the magnetization curve of polycrystalline ferrimagnets. Background on grain size distribution; Steps and equations necessary for the prediction of magnetization; Discussion on the Gobus model for magnetization mechanisms in polycrystalline ferrites.

Presents a study that calculated the time evolution of the charge carrier density, ionized donor density and space-charge field under a sinusoidal-light pattern by solving numerically the nonlinear differential equations for a photorefractive material. Material equations and numerical solution; Results and discussion.

Details a study which analyzed the initial holographic recording rate for a photorefractive thin films. Rate equations for photorefractive thin films; Holographic recording rates for small modulation depths; Diffraction properties of a photorefractive thin film.

Presents a study which characterized the optical induced gratings of Bi[sub4]Ge[sub3] single crystals doped with iron and manganese impurities and discussed the relative contribution of the photoreactive and photochromic effects. Experimental techniques used; Results of the study; Conclusions.

We performed simulations of the interaction of a graphene layer with the surface of lithium niobate utilizing density functional theory and molecular dynamics at 300K and atmospheric pressure. We found that the graphene layer is physisorbed on the lithium niobate surface with an adsorption energy of -0.8205 eV/(carbon-atom). Subsequently, the energy band structure, the optical absorption and reflectivity of the new system were calculated. We found important changes in these physical properties with respect to the corresponding ones of a graphene layer and of a lithium niobate crystal. [ABSTRACT FROM AUTHOR]

Focuses on a study which extended the domain wall size model of polycrystalline ferrimagnetics to the case of ferromagnetic amorphous ribbons. Role played by surface pinning; Assumption on the function of magnetization; Focus of the function of the domain wall size model; Mechanisms proposed to account for pinning phenomena in amorphous ribbons.

Presents information on a study which showed that the thermal dependence of the critical magnetic field can be given in terms of the saturation magnetization and the initial magnetic permeability. Experimental procedure; Results and discussion.

The adsorption of molecules usually increases capacity and/or strength with the doping of surfaces with transition metals; furthermore, carbon nanostructures, i.e., graphene, carbon nanotubes, fullerenes, graphdiyne, etc., have a large specific area for gas adsorption. This review focuses on the reports (experimental or theoretical) of systems using these structures decorated with transition metals for mainly pollutant molecules' adsorption. Furthermore, we aim to present the expanding application of nanomaterials on environmental problems, mainly over the last 10 years. We found a wide range of pollutant molecules investigated for adsorption in carbon nanostructures, including greenhouse gases, anticancer drugs, and chemical warfare agents, among many more. [ABSTRACT FROM AUTHOR]

Presents an abstract of the article 'Influence of the Grain Size Distribution on the Ferromagnetic Hysteresis Loop,' by M.A. Escobar, L.F. Magana and R. Valenzuela.