Large volume calorimeters are traditionally based on construction from high-density material or a “sandwich” construction of alternating layers of active and passive material. Dense scintillating material, made from materials such as BGO or lead-glass, is too costly to be used on a very large scale. In sandwich technology, energy resolution is often reduced due to a large fraction of the signal...

 3D Printed Glass: Surface Finish and Bulk Properties as a Function of the Printing Process Susanne Klein, Michael P. Avery, Robert M. Richardson, Paul Bartlett, Regina Frei, Steven J. Simske HP Laboratories HPL-2015-4 3D printing; glass; firing; bulk properties; surface finish It is impossible to print glass directly from a melt, layer by layer. Glass is not only very sensitive to temperature...

STATEMENT OF PROBLEM Computer-aided design and computer-aided manufacturing (CAD/CAM) resins exhibit good mechanical properties and can be used as long-term restorations. The wear rate of such resins and their enamel antagonists is unknown. PURPOSE The purpose of this study was to test and compare the 2-body wear rate of CAD/CAM resin blocks. MATERIAL AND METHODS Wear specimens (N=42, n=6) ...

Glass relaxation occurs in a range of temperature during transition from equilibrium to super-cooled liquid. Viscoelastic material model can be applied to simulate glass behavior in the glass transition regime. COMSOL Multiphysics software 4.3b can simulate the stress relaxation with the WLF (WilliamsLandel-Ferry) shift function, but no structural relaxation. In this study we developed a framew...

This study reports the feasibility of reusing glass fibre waste resulting from the thermolysis of polyester fibreglass (PFG) to produce a glass-ceramic material. PFG was treated at 550oC for 3 h in a 9.6 dm thermolytic reactor. This process yielded a solid residue (≈68 wt.%), an oil (≈24 wt.%) and a gas (≈8 wt.%). The oil was mainly composed of aromatic (≈84%) and oxygenated compounds (≈16%) an...

currently available non-invasive clinical methods for diagnosing osteoporosis are mainly associated with ionizing radiation. ultrasonic assessment of bone disease is a more recent technology. a theoretical explanation for the relationship between ultrasonic parameters and bone structure is necessary. thus, two types of bone samples of perspex (hap) and perspex-glass beads were produced. each ty...

This paper discusses the potential use of multi-walled carbon nanotubes (MWCNTs) to improve the mechanical properties of short glass fiber composites. Two methods to incorporate MWCNTs in short glass fiber composite fabrication were examined. First, Carboxylic-functionalized MWCNTs were dispersed in a silane fiber sizing material and then were allowed to bond to the surface of glass fibers. Sec...

OBJECTIVE The aim of this study was to investigate the adaptation of different types of restorations towards deciduous and young permanent teeth. MATERIAL AND METHODS Class V cavities were prepared in deciduous and young permanent teeth and filled with different materials (a conventional glass-ionomer, a resin-modified glass-ionomer, a poly-acid-modified composite resin and a conventional com...

First generation glass ionomer bone cement was introduced by Wilson and Kent in 1970s and used in dental procedures . In 1989 Hehl et al. reported their experiences of fixing incudostapedial joint with glass ionomer cement . After this study many authors have presented their glass ionomer bone cement ossiculoplasty series [3,5] They showed that very satisfactory hearing improvements can be obta...