55 results about "Structural evolution" patented technology

A composition comprising a plurality of cell aggregates for use in the production of engineered organotypic tissue by organ printing. A method of making a plurality of cell aggregates comprises centrifuging a cell suspension to form a pellet, extruding the pellet through an orifice, and cutting the extruded pellet into pieces. Apparatus for making cell aggregates comprises an extrusion system and a cutting system. In a method of organ printing, a plurality of cell aggregates are embedded in a polymeric or gel matrix and allowed to fuse to form a desired three-dimensional tissue structure. An intermediate product comprises at least one layer of matrix and a plurality of cell aggregates embedded therein in a predetermined pattern. Modeling methods predict the structural evolution of fusing cell aggregates for combinations of cell type, matrix, and embedding patterns to enable selection of organ printing processes parameters for use in producing an engineered tissue having a desired three-dimensional structure.

The invention relates to a method for acquiring a mobility parameter of a re-crystallized structure evolution crystal boundary of a metal material. The method comprises the following steps: (1) performing static re-crystallization or dynamic re-crystallization physical thermal simulation test on a metal material sample; (2) acquiring an average grain size of static re-crystallization or dynamic re-crystallization of the sample by utilizing a microstructure representation test; (3) establishing a re-crystallization dynamical model on the basis of a structural evolution numerical simulation method, wherein the model includes nucleation and growing sub-models; (4) describing a nucleation rate sub-model through a nucleation rate, excluding the parameters, such as nucleation activation energy, difficult to acquire through the test and the parameters without physical significance; (5) expressing the migration rate of the crystal boundary of a re-crystallization growing sub-model by the product of the driving force and the mobility parameter of the crystal boundary, wherein the mobility parameter of the crystal boundary is a unique fitting parameter in the whole model; (6) adjusting the mobility parameter of the crystal boundary by adopting an inverse optimization algorithm, comparing a numerical simulation result with a test result and confirming the parameter when a difference between the numerical simulation result with the test result is less than a threshold value (0.01-0.1).

The invention provides a constant width film stretching device combined with X-ray scattering, and an experimental method thereof. The device employs two Yaskawa servo motors to drive a ball screw to stretch a sample. The rotation of the motors is controlled by a Labview software. One end of the device is configured to a tension sensor for tracking tension change during a stretching process. During the stretching process, scissor mechanism fixtures are employed perpendicular to the stretching direction, so as to guarantee that the width of the sample can be kept constant during the stretching process and chuck points move uniformly along with the sample. The device employs a forced nitrogen stream to equalize temperature distribution in a sample cabin and reduce thermal degradation of the sample at a high temperature. Two temperature monitoring points are pre-set in the sample cabin. The temperature is precisely controlled by the temperature controller. The device has the advantages of easy disassembly and assembly and the like, is very suitable for combination with synchrotron radiation line stations, and is a very good device for studying the relationship between a structural evolution behavior and the film properties in film stretching and processing.

The invention provides a method and a system for simulating material structure evolution caused by irradiation. The method comprises the steps of acquiring cluster components, in-cluster atom distribution and cluster geometric structure on the condition of different defect concentrations and different element contents; acquiring the geometric structure and the cluster components of the cluster with lowest energy in the clusters on the condition of different defect concentrations and different element contents; calculating formation energy, binding energy and diffusion barrier of the cluster with the lowest energy through a modular statistics method; obtaining a cluster forming path of the cluster with lowest energy; and establishing a dynamics model of the material structure evolution caused by irradiation.