Despite the potentially negative effects on play performance and safety, little is currently known about the spatial and temporal variability in the properties of artificial turf pitches. The primary purpose of this study was to quantify the spatial and temporal variations in surface hardness across a 5-year-old third-generation artificial turf pitch over full year cycle. The secondary purpose ...

BACKGROUND Aim of the study was to verify the efficiency of Martens hardness measurements in detecting the degradation of composite resin cements during artificial aging. METHODS Four cements were used: Variolink II (VL2), RelyX Unicem 2 Automix (RUN), PermaFlo DC (PDC), and DuoCem (DCM). Specimens for Martens hardness measurements were light-cured and stored in water at 37 °C for 1 day to al...

Problem statement: Dammar is a natural resin that used anciently in varnish production. The use of dammar natural resin in coating is limited by undesirable properties for application in coating where it is considered very brittle. Due to dammar's brittle nature, an aged dammar coating can be easily scratched or abraded. Approach: Dammar natural resin could be modified into SiliconeDammar by us...

Performance and properties of bipolar junction transistor (BJT) devices are affected due to the harsh radiation environment. This report reviews the typical effects occurring in BJT devices due to irradiation with xrays. The defect parameters on the device tested is obtained by in situ experimental technique. In order to study the selfannealing behaviour in BJTS due to ionizing and displacement...

AIMS The aim of this study was to test the influence of different curing protocols on dentin marginal adaptation and the hardness of two composites. METHODS AND MATERIALS Three light-curing-units (LCUs): Quartz-Tungsten-Halogen (QTH: 541 mW/cm2), Argon-Ion-Laser (AL: 277 mW/cm2), and Plasma-Arc-Curing (PAC: 1818 mW/cm2) and two composites FiltekZ250 (F) and Tetric Ceram HB (TC) were tested. S...

Recently, modular techniques have been employed for optimising Description Logic reasoning, specifically to enable incremental reasoning and improve overall classification time. Classifying a module of an ontology should be significantly easier than reasoning in the whole ontology. However, we observed in previous work that neither it is generally true that modular reasoning techniques have a r...

This article provides information on the current production in Karaganda branch of RSE «KazStandard» reference hardness blocks, brief state blocks world and research conducted at this institute while improving manufacturing technology. Hardness test are designed to reproduce metals according standardized scales, for example, [1], [2], [3], [4]. Reference made accordance with [5] from carbon all...