The continuous steel casting process must simultaneously meet the requirements for production performance, quality and safety against breakouts. Knowing thickness of solidified shell, particularly at exit mould, is useful control breakout prevention. Shell difficult to measure during casting; in practice, it predicted by indirect methods models. But after undesired rupture shell leakage liquid ...

In this paper we present an approach for teaching visibility computation algorithms. Its suitability for undergraduate and graduate courses is discussed. The approach is based on the abstraction, during the rst stages of the teaching process, of the order of the surfaces (planes, quadrics.. .) of the scene as well as of the model (B-rep, CSG.. .). Speciic algorithmic aspects may also be treated...

Triangulated polyhedra are simpler to process than arbitrary polyhedra for many graphics operations. Algorithms that compute the boundary representation of a constructive solid geometry (csg) model, however, may perform poorly if the model involves triangulated polyhedral primitives. A new csg algorithm speciically tailored to triangulated primitives is presented. The key features of this algor...

A novel processing route for the fabrication of Allhigh silicon MMCs is presented. The silicon size is much finer than can be achieved by casting, yet the materials can still be formed into a near-net shape. Initial properties of the MMCs are presented, and methods under investigation to optimise processing and improve properties are discussed. fntroduction Hypereutectic AVSi ANoys Hypereutecti...

segregates. Although good agreement with experiments was MACROSEGREGATION in large steel ingots is one achieved, the model relied on many approximations (such of the most well-known and now classical problems in the as estimating the flow velocities). It should also be menfield of solidification and casting.[1] It arises from the relative tioned that many models have appeared in the literature ...

This paper presents a new algorithm to generate ray casted CSG animation frames. We consider sequences of frames where only the objects can move, in this way, we take advantage of the high screen area coherence of this kind of animation. A new deenition of bounding box allows us to reduce the number of pixels to be computed for the frames after the rst. We associate with each box a CSG sub-tree...

In this study, CNTs-reinforced Al-Cu-Mg-Si nanocomposites were successfully fabricated by high-energy ball milling (HEBM) combined with semi-solid stir casting. Then, the composites subjected to hot extrusion. The Microstructure and Phase analysis of CNT/Al-Cu-Mg-Si characterized an Optical microscope, Scanning Electron Microscope (SEM), XRD. Additionally, density, hardness, wear measured. resu...

Background and study aims: Feeding-related adverse events after percutaneous endoscopic gastrostomy (PEG) such as aspiration pneumonia may result in prolonged hospitalization and postoperative mortality. This study evaluated the efficacy of using semi-solid feeds to reduce feeding-related adverse events and improve clinical outcomes. Patients and methods: Patients who received PEG for enteral n...

In the present work, heat transfer coefficients (h) along different cooling zones of a continuous caster billet machine were determined during casting of low and medium carbon steels. The effects of casting parameters, such as machine characteristics, the ingot dimension, mold, sprays zones, radiant cooling, melt composition and casting temperature were investigated and correlated with heat tra...

The microstructure and mechanical properties of 7075 wrought aluminum alloy produced by strain induced melt activation (SIMA) route were investigated.Also liquid volume fraction measurement was studied by three procedures. Remelting process was carried out in the range of 560 to 610 °C for 20 min holding. The microstructure in the semi-solid state consists of fine spherical solid grains surroun...