Papers by Keyword: Incompatibility

Abstract: Compatibility investigation was performed between stearate lubricants (sodium stearate and magnesium stearate) and acidic pharmaceutical compounds (ibuprofen, indomethacin and valproic acid) and citric acid as acidic pharmaceutical excipient using differential scanning calorimetry (DSC). Alteration in DSC thermogram was found in all mixtures. There was a presence of melting endothermic peak of stearic acid in all mixtures (except that of stearate lubricants and indomethacin) indicating breakage of salt form of stearate lubricants depended on the physicochemical properties of drug compounds and pharmaceutical excipient. Therefore, the avoidance for using stearate lubricants with acidic pharmaceutical compounds and excipient should be concerned in development of pharmaceutical formulations.

Abstract: The barrier free transplantation of software is critical to the development of intelligent software. On different software platform, there are great differences between the software interfaces and the communication protocols, resulted in software cannot be directly transplanted on different platform. Once the platform is different, the differences of software characteristic are big, and the software compatibility will become worse rapidly. The incompatibility problem is occurred in the transplantation process, the effective software transplantation cannot be completed. An improved software features compatibility elimination method is proposed based on K-means indefinite feature clustering algorithm. The incompatible software features probability is obtained in difference platform, software features are obtained. The incompatibility of software transplantation is eliminated on the difference platform, to ensure that the software transplantation is operated successfully. The experiment results show that, the parallel efficiency of software transplantation is improved on the different platform, the performance is better than traditional method. The efficiency and stability of the software transplantation is good, and it is an effective software features incompatibility processing method.

Abstract: The degradation of PVC-P membranes in direct contact with bituminous membranes is well known problem. There is also the degradation of PVC-P membranes connected with EPS polystyrene incompatibility. Both bituminous membranes and EPS polystyrene board have been used to determine the differences in signs of PVC-P degradation.

Abstract: We introduce a mesoscopic framework that is capable of simulating the evolution of dislocation networks and, at the same time, spatial variations of the stress, strain and displacement fields throughout the body. Within this model, dislocations are viewed as sources of incompatibility of strains. The free energy of a deformed solid is represented by the elastic strain energy that can be augmented by gradient terms to reproduce dispersive nature of acoustic phonons and thus set the length scale of the problem. The elastic strain field that is due to a known dislocation network is obtained by minimizing the strain energy subject to the corresponding field of incompatibility constraints. These stresses impose Peach-Koehler forces on all dislocations and thus drive the evolution of the dislocation network.

Abstract: The continuum theory of dislocations, as developed predominantly by Kröner and Kosevich, views each dislocation as a source of incompatibility of strains. We show that this concept can be employed efficiently in the Landau free energy functional to develop a mean-field mesoscopic model of materials with dislocations. The order parameters that represent the distortion of the parent phase (often of cubic symmetry) are written in terms of elastic strains which are themselves coupled by incompatibility constraints. Since the “strength” of the incompatibility depends on the local density of dislocations, the presence of dislocations affects the evolution of the microstructure and vice versa. An advantage of this formulation is that long range anisotropic interactions between dislocations appear naturally in the formulation of the free energy. Owing to the distortion of the crystal structure around dislocations, their presence in multiphase materials causes heterogeneous nucleation of the product phase and thus also shifts of the transformation temperature. This novel field-theoretical approach is very convenient as it allows to bridge the gap in studying the behavior of materials at the length and time scales that are not attainable by atomistic or macroscopic models.

Abstract: Physical interpretations of the incompatibility tensor are extensively discussed and applied to model several practically-important dislocation substructures in metallic materials. This paper firstly performs a tangible decomposition of the incompatibility tensor into the two types of defects by introducing Nye’s contortion tensor, and also clarifies the interrelationship with expressions given based on differential geometry. The effects on the evolutions of intra-granular substructures like cells and geometrically-necessary type bands are examined based on finite element simulations on multi-grain models under tension and simple shear with several representative orientations.