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Identification of Equivalent Elastic and Damping Parameters for Roll Core Sandwich Panels of Railway Vehicles

Micro/Macro Damage Evaluation of Flat Braided Composites with a Circular Hole

Free Vibration Analysis of Angle-Ply Laminated Circular Cylindrical Shells with Clamped Edges

Interfacial Properties of PP/PP Composites

Phase separation of o/w-emulsions by coalescence in hydrophobic membranes

Effect of pollutant gases on electrical insulators deterioration

In this work ceramic materials as electrical insulators have been exposed in laboratory-based chambers. Water contact angle and FTIR of the surface before and after pollutant exposures have been studied. The results indicated that the reaction between the policrete and the atmospheric pollutant produce some salts depo…

Chaotic Mixing Analyses by Distribution Matrices

Distributive fluid mixing in laminar flows is studied using the concept of concentration distribution mapping matrices, which is based on the original ideas of Spencer & Wiley [1], describing the evolution of the composition of two fluids of identical viscosity with no interfacial tension. The flow domain is divided i…

Dynamic Mechanical Freezing Points of Cosmetic O/W Emulsions and Their Stability at Low Temperatures

To develop cosmetic products quickly and effectively, developers need reliable test methods for evaluating product stability. Phenomena that determine the stability of cosmetic emulsions include phase transitions taking place in the relevant application and storage temperature range. The tendency of ingredients to cry…

Congresos Seminarios y Cursos Noticias, Ferias y Exposiciones

Fluid Immobilization – A Structure-Related Key Mechanism for the Viscous Flow Behavior of Concentrated Suspension Systems

Abstract The role of fluid immobilization (FIM) is not only of great importance for solid food systems with respect to their stability, but is also a crucial factor for the rheological behaviour of suspension systems [1]. Besides the fluid binding mechanisms known for porous solids an additional hydro-dynamically indu…

Structure correlation study of four-coordinate copper(I) and (II) complexes

The geometries of four-coordinate CuI and CuII complexes in the Cambridge Structural Database (CSD) have been analysed systematically and compared using symmetry-deformation coordinates and principal component analysis. The observed stereochemistries have been rationalized in terms of the d-electron configurations, in…

Nano-assembly of glucose oxidase on thein situself-assembled films of polypyrrole and its optical, surface and electrochemical characterizations

An in situ self-assembly technique with nanometre control over thicknesses and multilayered structures was used to manufacture the ultrathin films of polypyrrole (PPY). The PPY film was deposited on a polyanion, poly(styrene sulfonate) (PSS) modified surface as a function of time, previously PSS had been deposited on…

Optical properties of Ag–TiO_2 nanocermet films prepared by cosputtering and multilayer deposition techniques

Ag -TiO2 nanocermet thin films, deposited for optical filtering applications by two sputtering techniques, codeposition and multilayer deposition, exhibit surface plasmon absorption in the spectral range 450 -500 nm. The cosputtering technique induces a columnar growth, whereas multilayer deposition produces a more-ra…

Cationic Order and Structure of [Zn−Cr−Cl] and [Cu−Cr−Cl] Layered Double Hydroxides: A XRD and EXAFS Study

X-ray diffraction (XRD) and extended X-ray absorption fine structure (EXAFS) were used to evidence a cationic order within sheets of the layered double hydroxides (LDH) [Zn−Cr−Cl] and [Cu−Cr−Cl]. The [Zn−Cr−Cl] LDH is well kown for its ability to be synthesized only with the ratio Zn/Cr = 2, whatever the proportion of…

Magnetic irreversibility in ultrafine ZnFe2O4 particles

Pure ultrafine ZnFe2O4 particles have been obtained from mechanosynthesis of the ZnO and Fe2O3 oxides. The average grain diameter was estimated from x-ray diffraction to be 〈d〉=36(6) nm. Refinement of neutron diffraction data showed that the resulting cubic spinel structure is oxygen deficient, with ∼7% of Fe3+ ions o…

Charge, Spin, and Orbital Ordering in the Perovskite Manganates, Ln1-xAxMnO3 (Ln = Rare Earth, A = Ca or Sr)

Charge ordering occurs in some mixed-valent transition metal oxides. The perovskite manganates of the formula Ln 1 - x A x MnO 3 (Ln = rare earth; A = Ca, Sr) are especially interesting because long-range ordering of the Mn 3+ ( ) and Mn 4+ ( ) ions in these materials is linked to antiferromagnetic spin ordering, and…

Charge ordering and phase competition in the layered perovskiteLaSr2Mn2O7

Charge-lattice fluctuations are observed in the layered perovskite manganite ${\mathrm{LaSr}}_{2}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ by Raman spectroscopy at temperatures as high as 340 K, and with decreasing temperature they become static, forming a charge-ordered (CO) phase below ${T}_{\mathrm{CO}}=210\mathrm{K}.$ In…

Generalized phase-field model for computer simulation of grain growth in anisotropic systems

We study the dynamics and morphology of grain growth with anisotropic energy and mobility of grain boundaries using a generalized phase-field model. In contrast to previous studies, both inclination and misorientation of the boundaries are considered. The model is first validated against exact analytical solutions for…

Phase transition in perovskite manganites with orbital degree of freedom

Roles of orbital degree of freedom of Mn ions in phase transition as functions of temperature and hole concentration in perovskite manganites are studied. It is shown that the orbital order-disorder transition is of the first order in the wide region of hole concentration, and the N\'eel temperature for the anisotropi…