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Improving Newton's method for Initialization of Modelica models

Initializing a model written in Modelica translates to finding consistent initial values to the underlying DAE. Adding initial equations and conditions creates a system of non-linear equations that can be solved for the initial configuration. This paper reports an implementation of Newton's method to solve the non-linear initialization system. This implementation also uses a regularization method

Dynamic Manufacturing Costs - Describing the Dynamic Behavior of Downtimes from a Cost Perspective

Downtimes in a manufacturing cell, line or individual machines are characterized by a stochastic behavior that their frequency and their duration display. A method is presented here for analyzing this dynamic behavior from a cost perspective. An important element of the method is statistical analysis of downtimes, including empirical distribution functions pertaining to downtimes of specific types

Artificial Neural Networks for Gas Turbine Monitoring

Due to the deregulation of the electricity market the power producers are forced to continuously investigate various means of maintaining/increasing their profits. Improving the electrical efficiency through hardware upgrades is probably the most commonly employed measure, although the interest for enhancements with regard to plant operation is on the rise. Plant operation improvement is often m

Sverige måste bli bättre på att kontrollera dricksvattnet

Styvmoderligt behandlat område. Undersökningar visar att vart tredje svenskt grundvattenprov är förorenat av växtskyddsmedel. Ändå övervakas bara fjorton procent av de svenska grundvattenförekomsterna. Sverige måste agera nu för att få kontroll över situationen, skriver nio forskare och experter.

Raytracing in the compensation of the peripheral optics of the eye

Abstract Background: Many people with a visual impairment have only peripheral vision. However, there is limited knowledge of the peripheral optics of the eye and only some measurements are available in this field. Methods: We simulated the paths of peripheral rays through the eye by means of raytracing. Five programs were compared. The OSLO raytracing software proved to be not only the best one