Let M be a left module over a ring R and I an ideal of R. We call (P,f ) a projective I -cover of M if f is an epimorphism from P to M , P is projective, Kerf ⊆ IP , and whenever P = Kerf + X, then there exists a summand Y of P in Kerf such that P = Y +X. This definition generalizes projective covers and projective δ-covers. Similar to semiregular and semiperfect rings, we characterize I -semir...

Mining/marine bushings, biomedical implants, and many more are among the several applications of lightweight elastomer components. The use non-traditional machining to manufacture these good-quality components in small or batch-size units is required because primary manufacturing method requires customised mould follow-up machining. In this regard, present work focuses on investigating performa...

This paper focuses on wire electrical discharge machining (WEDM) of devices made from commercially available sintered neodymium-iron-boron (NdFeB) rare-earth magnets that have been magnetized before machining. We conduct an experimental study to quantify the effects of the voltage and capacitance of an RC-type WEDM machine, as well as the magnet polarity, on slicing rate, mean kerf, and variati...

Nowadays, industrial laser cutting systems employ a fixed set of process parameters throughout the cut same workpiece, which results in good compromise between maximum productivity and surface quality. The are commonly by trial-and-error experiments carried out on different materials thicknesses or less frequently physical modelling. However, final quality is not constant even though kept due t...

Reducing the kerf width in bandsawing has potential reducing waste while optimising yield. To be able to reduce width, understanding cutting forces becomes critical. In this work, nine teeth with varying band-body thicknesses and side clearances were tested by both heartwood sapwood of Norway spruce (Picea abies (L.) Karst.) Scots pine (Pinus sylvestris L.) frozen non-frozen conditions. Single ...

We consider typical tasks that arise in the intrusion analysis of log data from the perspectives of Machine Learning and Information Retrieval, and we study a number of data organization and interactive learning techniques to improve the analyst’s efficiency. In doing so, we attempt to translate intrusion analysis problems into the language of the abovementioned disciplines and to offer metrics...

Nowadays, carbon fiber reinforced plastics (CFRP) composites is widely used in the aerospace industry due to its excellent mechanical properties. In laser cutting process, high powers are used to cut materials then material melts and burns leaving edges with a high quality finish. To fulfill the high demand of cutting quality, a set of laser cutting parameters of CFRP material are studied. The ...

Wire electric discharge machining (WEDM) is one of the advanced machining processes. Response surface methodology coupled with Grey relation analysis method has been proposed and used to optimise the machining parameters of WEDM. A face centred cubic design is used for conducting experiments on high speed steel (HSS) M2 grade workpiece material. The regression model of significant factors such ...

Wire electric discharge machine (WEDM) is spark erosion in unconventional machining technique to cut hard and the conductive material with a wire as an electrode. The blanking die material SKD 11 is a high carbon and high chromium tool steel with high hardness and high wearing resistance property. This tool steel has broad application in press tools and dies making industries. In this research ...