In Direct Metal Laser Sintering objects are created by sequential sintering loose metal powder particles by means of laser technology. When the laser sintering process involves temperature gradients, thermal stresses develop. Corresponding residual stresses induce warping of the densified structure leading to unacceptable tolerance losses. This paper examines the role of laser beam scan pattern...

A laboratory study of the Cannibal process was undertaken to determine if the Cannibal system would generate less sludge compared with a conventional activated sludge system. Side-by-side sequencing batch reactors were operated--one using the Cannibal configuration and the other as conventional activated sludge. It was found that the Cannibal process generated 60% less solids than the conventio...

Automated veri cation of dynamic multi-threaded computing systems is severely a ected by problems relating to dynamic process creation. In this paper, we describe an abstraction technique aimed at generating reduced state space representations for such systems. To make the new technique applicable to a wide range of di erent system models, we express it in terms of general labelled transition s...

In contrast to other mutations, duplication leaves an easily detectable trace: a repetition. Therefore it is a convenient starting point for computing a phylogenetic network. Basically, all squares must be detected to compute all possible direct predecessors. To find all the possible, not necessarily direct predecessors, this process must be iterated for all the resulting strings. We show how t...

background: heavy metals in aquatic systems usually interfere with many beneficial uses of water. divalent nickel is a commonly occurring toxic metal in natural ecosystems due to the effluent of refineries, electroplating, and casting industries. in aquatic environments, nickel appears as ni (ii) and ni0. despite the high reported toxicity for ni (ii), ni0 is only slightly toxic. various method...

Additive manufacturing and 3D printing methods based on the extrusion of material have become very popular in recent years. There are many ceramics, but direct method gives largest range sizes printed objects enables scaling processes also large-scale applications. Additionally, application this to ceramic materials is particular importance due its low cost, ease use, high utilization. The pape...

Variation has long been an enemy to manufacturing quality and productivity. As technology increases our ability to record and process data we explore what kinds of improvements can be made with the new tools now available. The Tenneco Packaging facilities in Tomahawk, Wisconsin offer a particularly rich source of data with which to test these tools. Three good data sets have been assembled and ...