Most algorithms for computing local or global solutions of linear differential systems handle only the case of square systems. However, in many applications such as control theory, systems that appear are generally non-square. In this paper, we use a constructive algebraic analysis approach to reduce the integration of a rectangular linear ordinary differential system to that of a square system...

Abstract The photovoltaic sector needs a high-throughput slicing method that produces minimal waste to meet rising demand. Wire electric discharge machining (WEDM) has emerged as an alternative in recent research efforts. Polycrystalline silicon is sliced using the WEDM process with zinc-coated electrode of Ø0.25 mm diameter. Experiments were planned and conducted according Box Behnken’s design...

Monoidal width was recently introduced by the authors as a measure of complexity decomposing morphisms in monoidal categories. We have shown that category cospans graphs, and its variants can be used to capture tree width, path branch width. In this paper we study matrices, an extension different open where connectivity information is handled with matrix algebra graphs are composed along edges ...

A review of the available literature on powder mixed electrical discharge machining (PMEDM) indicates that most research has been done for “die sinking mode” whereas “wire cut not received due attention despite being an important process variant. This work employs silicon carbide (SiC) dielectric fluid AISI D2 in cut” mode with re-circulating molybdenum wire (an economic and chemically stable p...

AImtrm--The quality of a laser-made cut is of the utmost importance in laser processing. Any improvement in this area would be of considerable significance, in that it would lead to an elimination of post-machining operations. Currently the mechanisms governing the laser cutting process are not fully understood, partially due to the fact that laser cutting is a highly complex thermal process. I...

Quality improvements in laser cutting of mild steel have been achieved by a newly developed model-based optimisation strategy. The specific aims of such efforts are to assure quality of cut right up to pre-cut sections and boundaries, which are inherent in intricate part programs. Such boundaries frustrate heat transfer and result in bulk heating of the workpiece. This in turn leads to a degrad...

The authors reviewed a 10-year consecutive series of ulnar-shortening osteotomies using a freehand, single oblique cut with 2 or 3 stacked saw blades. Twenty-one patients (23 wrists) with chronic ulnar impaction syndrome (mean age, 45 years; range, 16 to 73 years) demonstrated an average preoperative ulnar variance of +2.1 mm (range, 0.0 to 4.0 mm). An oblique osteotomy was performed in the dis...

Up-to-date fibre lasers produce multi-kw radiation with an excellent beam quality. Compared to CO2-lasers, fibre lasers have relatively low operational costs and offer a very high flexibility in production due to the beam delivery with process fibres. As a consequence, fibre lasers have attracted more and more attention. On the other hand, their use in industrial applications especially in the ...

The mechanisms of melt ejection and striation formation in laser cutting of mild steel are discussed. It is argued that the melt ejection from the cutting front is not a steady state process, but rather shows a cyclic phenomenon. The striation are strongly affected by the unstable characteristic of the thin liquid film on the cutting front during the melt ejection, together with the oxidation a...