Abstract: The device relates to a system for predicting the period for children to safely wear newly acquired footwear without the risk of damage to their growing feet, which is directly applicable in shoe shops (at their computer cash registers). The essence of the solution for a system for predicting the period for children to safely wear newly acquired footwear rests in the fact that it contains an input module measuring foot length and input of information about the age of the monitored child to which is linked a model for predicting the growth of the child's foot by applying the laws of growth, possibly also including genetic and local influences, connected to a comparative and inferential module establishing the predicted course of growth in foot length of the monitored child, to which is then linked an output module designating the nearest date for the necessary replacement of shoe size for the monitored child.

Abstract: Method for abrasive waterjet cutting of materials determines a constant of cuttability using an abrasive waterjet Kawj, according to version A, where three deformation parameters are measured on a test cut/sample, version B, where two deformation parameters are measured, version C where one parameter is measured, or a version D where the design is carried out by calculating Kawj according to Young's modulus or according to an ultrasonic wave speed of the cut material. This constant is subsequently input to an algorithm. The result of a calculation using the algorithm acquires sufficient numerical and graphical data to an optimum setting of parameters and are generally valid for all engineering materials, and further of data on cut quality, limit depth of cuts and economical parameters, and also on mechanical properties of the cut material with regard to classification of the material into cuttability class.

Abstract: The device relates to a system for predicting the period for children to safely wear newly acquired footwear without the risk of damage to their growing feet, which is directly applicable in shoe shops (at their computer cash registers). The essence of the solution for a system for predicting the period for children to safely wear newly acquired footwear rests in the fact that it contains an input module measuring foot length and input of information about the age of the monitored child to which is linked a model for predicting the growth of the child's foot by applying the laws of growth, possibly also including genetic and local influences, connected to a comparative and inferential module establishing the predicted course of growth in foot length of the monitored child, to which is then linked an output module designating the nearest date for the necessary replacement of shoe size for the monitored child.

Abstract: Method for abrasive waterjet cutting of materials determines a constant of cuttability using an abrasive waterjet Kawj, according to version A, where three deformation parameters are measured on a test cut/sample, version B, where two deformation parameters are measured, version C where one parameter is measured, or a version D where the design is carried out by calculating Kawj according to Young's modulus or according to an ultrasonic wave speed of the cut material. This constant is subsequently input to an algorithm. The result of a calculation using the algorithm acquires sufficient numerical and graphical data to an optimum setting of parameters and are generally valid for all engineering materials, and further of data on cut quality, limit depth of cuts and economical parameters, and also on mechanical properties of the cut material with regard to classification of the material into cuttability class.