Additive Manufacturing is the formalized term for what used to be called rapid prototyping and what is popularly called 3D Printing by adding layer-upon-layer of material, whether the material is plastic, metal,.etc. Stereolithography(STL) is the standard file type used by most additive manufacturing processes. This is the file type whichwill be saved from the 3D design software package, etc.solidwork.Most commonly the slicer and the client software are combined, making the conversion from STL file3D Print straight forward and simple. Before printing a 3D model from an STL file, it must first be examined forthe errors. The errors are surfaces or facets don’t meet and facets that are too thin. Software programs such as Meshmixer, Cura and Slic3r are examples, which will correct these issues.

Composites are materials which are mixed with one or more different and heterogeneous reinforcement. Matrix materials can generally be polymers, ceramics and metals. The matrix in the composite serves to distribute the load into all reinforcing material. Matrix properties are usually ductile. The reinforcing material in the composite has the role of holding the load received by the composite material. The nature of the reinforcing material is usually rigid and tough. Strengthening materials commonly used so far are carbon fiber, glass fiber, ceramics. The use of natural fibers as a type of fiber that has advantages began to be applied as a reinforcing material in polymer composites. This study seeks to see the effect of the use of bamboo natural fibers in polyester resin matrix on the strength of polymer composites with random and straight lengthwise fiber variations. From the tensile test results it can be seen that bamboo fibers can increase the strength of polymer composites made from polyester resin and the position of the longitudinal fibers gives a significantly more strength increase than random fibers.

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A spectrophotometric study of cerium IV and chromium VI species in nuclear fuel reprocessing process streams I D Nickson, C Boxall, A Jackson et al. The experiments were carried out using a type M-273 EG&G galvanometer test instrument. The post-corrosion samples' microstructure has analyzed with the aid of energy dispersive spectroscopy (EDS) equipped SEM instrument to detect the presence of any viable corrosion by products. Experimental results confirm that stainless steels-316 commercial alloys immersed in a nitric acid corrosion medium with a variation of concentration experience very little or almost no corrosion and that according to the so-called Fontana's criteria these test-materials turn out to have an excellent resistance toward nitric acid corrosion. This is also evidenced by the very low corrosion rate value measured in this study. SEM-EDS study, lts indicate that the possible ensuing corrosion by products are iron oxides, and chrome oxides.