abstract: in this paper, the results of experimental and numerical simulation of low velocity impact process have been carried out to investigate energy absorption of composite sandwich panels with 3d woven fabrics of glass fibers and epoxy resin. for this purpose, diagrams of force-displacement of the quasi-static and quasi-dynamic impact tests were studied. for the finite element simulation, ...

Abstract The complex and variant patterns of costume were important parts the human cultures in history. Generally, early dress beings started from non-woven fabrics such as grass leaves, barks, beast coats fur, other natural resources, developed into woven cloth products fiber thread with warp weft structure.The clothing variants are cultural representation ethnic groups, showing different tra...

The sea urchin fertilization envelope is an extracellular matrix assembled at fertilization to prevent polyspermy and protect the embryo during early development. During hatching, the embryo secretes a proteolytic hatching enzyme which dissolves the fertilization envelope, allowing a ciliated blastula to swim free. In this study we examined ultrastructural changes in the fertilization envelope ...

Statement of problem: Fracture strength of a denture base resin is of great concern, and many approaches have been used to strengthen acrylic resin dentures. Purpose: The aim of this study was to measure the transverse strength of a heat polymerized acrylic resin, after reinforcement with metal wire and two types of glass fibers. Materials and Methods: Forty rectangular specimens (65.0×10.0×3.3...

In the past few years, the growing need for alternative power sources has generated considerable interest in the field of energy harvesting. A particularly exciting possibility within that field is the development of fabrics capable of harnessing mechanical energy and delivering electrical power to sensors and wearable devices. This study presents an evaluation of the electromechanical performa...

Morphological studies were carried out to delineate the characteristics of connective tissue sheaths surrounding working myocardial cells and Purkinje cells in the moderator band of adult sheep hearts, using a series of techniques including silver staining, immunohistochemistry, transmission electron microscopy (TEM) and scanning electron microscopy (SEM). For SEM, tissue blocks were treated wi...