In the development of industrial processes there are situations where it is necessary to control or simultaneously monitor two or more quality variables of the production process. The problems of process monitoring where several related variables are studied can be controlled by means of multivariate control charts. The objective of this work is to describe the implementation of the control cha...

We introduce heterogeneous preferences for location in 2-region core-periphery models, thereby generating an additional dispersive force: the home-sweet-home effect. Different forms of heterogeneity induce different long-run spatial distributions economic activity, depending on short-run equilibrium model and distribution that are considered. Our analysis highlights importance convexity/concavi...

background transfusion-induced iron overload leads to many complications in patients with β-thalassemia major. this study aimed to compare the level of iron stored in the liver and heart measured by mri t2 * with ferritin levels in these patients. materials and methods this study was done on 52 patients with β-thalassemia major aged 7 to 29 years. serum ferritin level was checked and heart and ...