In this paper the effect of heat and ammonia treatment on the change in colour of oak wood (Quercus robur) and comparison of physical and mechanical properties were investigated. Wood specimens were made from heartwood and sapwood in dimensions 30×30×30 mm3. The specimens were subjected to heat treatment at 180oC and 230oC for 2 and 4 hours, others were treated by ammonia for 24 hours. After th...

BACKGROUND Contaminated dentures need to be disinfected as a part of denture hygiene regimen. This study was conducted to determine the colour stability of heat cure acrylic resin after treatment with two disinfectants. METHODS This in-vitro experimental study was conducted at Dr Ishrat-ul- Ebad Khan Institute of Oral Health Sciences, Dow University of Health Sciences and Al Karam Textiles Ka...

A number of polycarboxylic acids butane tetracarboxylic acid BTCA, polyacrylic-co-maleic acid PAMA, citric acid, maleic-itaconic MA-IA were examined, in combination with sodium hypophosphite SHP in order to give a similar high fabric crease recovery performance and whiteness index to traditional formaldehyde based crease agents. BTCA showed to be the best crease resist agent for crosslinking co...

COLORIMETRIC determination of vitamin A has frequently been based upon the Carr-Price reaction, namely the production of a blue colour when vitamin A is added to a saturated solution of antimony trichloride in chloroform, which shows two absorption maxima at 606 m,u and at 572 m,u, respectively. This reaction has the following drawbacks: (1) the blue colour is not specific for vitamin A, being ...

It is often assumed that colours in an image correlate with intrinsic surface properties (e.g. reeectance). Indeed, this goes a long way to explain the predominance of colour as feature for image indexing. Unfortunately the assumption is unfounded since the image of a scene viewed under two diierent coloured lights contains two diierent sets of colours; that is, image colour is a measure of the...

Because the colours in an image convey a lot of information, almost all image database systems support colour content queries. Unfortunately colour based queries do not always return the images that were sought even although there is a good colour match. Such failures are easily explained. We as human observers do not see raw image colours but rather make an interpretation of the colours in an ...

This paper describes the development of emerging colour interpolation techniques as GIMP plug-ins: Colouring Greyscale Images and Image Inpainting. The plug-ins will offer new image manipulation functionality that will enhance the capability of GIMP Colouring Greyscale Images refers to the ability to change the ‘mood’, colour information, of a greyscale image. The colorizing of the greyscale im...

Two experiments investigated Michotte's launch event, in which successive motion of two objects appears to evoke an immediate perception that the first motion caused the second, as in a collision. Launching was embedded in event sequences where a third event (a colour change of the second object) was established as a competing predictor of the second motion, in an attempt to see whether subject...