Comparison of Porcelain Surface and Flexural Strength Obtained by Microwave and Conventional Oven Glazing

Statement of problem. Although the superior qualities of microwave technology are common knowledge in the industry, effects of microwave glazing of dental ceramics have not been investigated. Purpose. The purpose of this study was to investigate the surface roughness and flexural strength achieved by glazing porcelain specimens in a conventional and microwave oven. Material and methods. Thirty specimens of each type of porcelain (Omega 900 and IPS d.Sign) were fabricated and sintered in a conventional oven. The specimens were further divided into 3 groups (n=10): hand polished (using diamond rotary ceramic polishers), microwave glazed, and conventional oven glazed. Each specimen was evaluated for surface roughness using a profilometer. The flexural strength of each specimen was measured using a universal testing machine. A 2-way ANOVA and Tukey HSD post hoc analysis were used to determine significant intergroup differences in surface roughness (α=.05). Flexural strength results were also analyzed using 2-way ANOVA, and the Weibull modulus was determined for each of the 6 groups. The surfaces of the specimens were subjectively evaluated for cracks and porosities using a scanning electron microscope (SEM). Results. A significant difference in surface roughness was found among the surface treatments (P=.02). Follow-up tests showed a significant difference in surface roughness between oven-glazed and microwave-glazed treatments (P=.02). There was a significant difference in flexural strength between the 2 porcelains (P Conclusions. The surface character of microwave-glazed porcelain was superior to oven-glazed porcelain. Omega 900 had an overall higher flexural strength than IPS d.Sign. Weibull distributions of flexural strengths for Omega 900 ovenglazed and microwave-glazed specimens were similar. SEM analysis demonstrated a greater number of surface voids and imperfections in IPS d.Sign as compared to Omega 900

Spartan Daily November 30, 2010

Volume 135, Issue 47https://scholarworks.sjsu.edu/spartandaily/1210/thumbnail.jp

Recetas medievales para el vidriado de la cerámica

El presente trabajo está dedicado al análisis de las técnicas para el vidriado de la cerámica que aparecen documentadas en diversos tratados y recetarios de época medieval. Se trata de textos procedentes, en su mayor parte, de la Península Italiana, que incluyen recetas dedicadas al vidriado de la cerámica al plomo y al estaño, con particular referencia a la realización de la loza dorada. El estudio comenta los textos donde dichas recetas se insertan, las técnicas de trabajo que mencionan y concluye con un apéndice documental en el que se incluye la traducción al castellano de las recetas estudiadas.This work is dedicated to the analysis of techniques for glazing ceramics that are documented in some treatises and recipe books of medieval times. These are texts from, for the most part, the Italian Peninsula, including recipes dedicated to the glazed ceramic with lead and tin, with particular reference to the making of the so-called, golden ceramic. The study discusses the texts in which these recipes are inserted, the techniques of work mentioned and it concludes with an appendix which includes the translation into Castilian language of the prescriptions studied

Environmental Issues in Metal Extraction

The non-ferrous metals industry is a key sector in the Indian economy as it meets the requirements of a wide range of key industries including engineering, electrical and electronics, infrastructure, automobile and automobile components, packaging etc. The Indian non-ferrous metals industry comprises of the primary and secondary downstream seginents. Primary producers are those players who process the mined ore to obtain the primary metal. This metal is commercially available in the form of rods, ingots, cath-odes, wires etc., Secondary producers are those players who manufacture value added products like foils, extrus-ions, dry batteries, castings etc., either by procuring the metal from the primary producers or from scrap

Environmental Issues in the Processing and Extraction of Non-ferrous Metals

The non-ferrous metals industry is a key sector in the Indian economy as it meets the requirements of a wide range of key industries including engineering, electrical and electronics, infrastructure, automobile and automobile components, packaging etc. The Indian non-ferrous metals industry comprises of the primary and secondary downstream segments. Primary producers are those players who process the mined ore to obtain the primary metal. This metal is commercially available in the form of rods, ingots, cathodes, wires etc., Secondary producers are those players who manufacture value added products like foils, extrus-ions, dry batteries, castings etc., either by procuring the metal from the primary producers or from scrap

CURCUMIN ATTENUATES LEAD (Pb)–INDUCED NEUROBEHAVIORL AND NEUROBIOCHEMICAL DYSFUNCTION: A REVIEW

Lead is one of the common chemical elements that is assigned the symbol Pb which came from the Latin Plumbum. Pb is widely used in the field of coating, refine and glaze ceramics and pottery. It is still used in the production of products like water pipes, cooking utensils and cooking utensils. In addition it is also used in insulation of building ceilings, cable coverage and military industries. Lead enter the environment from those uses and from the environment it enter into the living organisms. Lead accumulates in many humanorgans, but the brain is the target organ of lead accumulation. Neurotoxicity of lead is, one of lead toxicity, caused many symptoms. There are many behavioral and biochemical modifications induced by lead toxicity like learning and memory deficits, anxiety disorders, social and sexual behavior modifications and neurotransmitter system deficits. Curcumin is a bioactive natural phytochemical phenolic compound (diferuloylmethane) extracted from the rhizome of Curcuma longa. Most studies indicated the role of curcumin in reducing the damage of lead toxicity. In the current review, emphasis was based on the toxicity of lead and its effect on behavior and some neurotransmitters related to behavior. The effect of curcumin is improving the neurotoxicity and behavioral toxicity of lead

Fifth Year Report: Institute of Making, UCL 2017-18

A report on the research activities of the Institute of Making covering the period from March 2017 to March 201