PURPOSE In the present study collagen sheets were prepared from the spongy part of the bovine femur and characterized from the physicochemical point of view. METHODS The physicochemical properties of the collagen sheets were studied using scanning electronic microscopy (SEM) and thermogravimetrical analysis (TGA). RESULTS The SEM studies showed that the collagen sheets are porous and exhibi...

This paper summarizes our theoretical understanding of supernova events in a “back of the envelope” way. It is intended to aid in the recognition and understanding of those events which are not “standard”, and which may provide the most insight.

The English literature component has been around in the Malaysian Education system since 2000. However, literature as a subject has always been learned more for transactional purposes rather than for its aesthetic value. Basically, a regurgitation of knowledge from years of learning, poured out in one major examination. In this research, the researcher applies a teaching method, called the lite...

this study is considering a micropolar fluid flow over a porous stretching sheet in the presence of thermal radiation and uniform magnetic field. the effects of local variation in thermal conductivity of micropolar fluid on heat transfer rate from the sheet are investigated; besides, the impacts of radiation, magnetic field and porous sheet on variations of thermal boundary layer thickness are ...

The experimental detection of localized necking is an important issue in sheet metal forming. Today, the most common and extended techniques are strain-based methods using digital image correlation (DIC). present work discuses a thermal methodology to detect onset metals based on analysis temperature gradient infrared thermography (DIT). A series tensile tests H240LA-O3 high-strength steel 1.2m...

Carl Sandburg, in his "The People, Yes," writes of the meeting of an Indian and a white man. The latter, impressed with his own importance, draws a small circle in the sand and says, "This is what the white man knows." The Indian, the much wiser of the two, draws an enormous circle and then correctly points out, "This is where the white man and the red man know nothing." Sandburg's story is an ...

Laser bending is an advanced process in sheet metal forming in which a laser heat source is used to shape the metal sheet. In this paper, temperature distribution in a mild steel sheet metal is investigated numerically and experimentally. Laser heat source is applied through curved paths in square sheet metal parts. Finite element (FE) simulation is performed with the ABAQUS/CAE standard softwa...

recently, incremental sheet metal forming (ismf) process as one of the new methods in rapid prototyping collection has been considered by researchers. this process is based on a defined path in cnc controller and applies a spherical-head tool that supplies the required pressure for sheet metal forming. despite affirmation of process ability in forming symmetric geometries, some of its aspects s...