ABSTRACT The aim of this current study was to prepare LnCrO3 (Ln= La, Pr, Nd) in order investigate the influence lanthanides ions on structural and color properties chromites. powders were synthesized by microwave-assisted auto-combustion method using urea as a fuel. After calcination at 800 1000 °C, characterizations performed X-ray diffraction (XRD), scanning electron microscopy (SEM), transm...

Color haiftoning using a conventional screen requires careful selection of screen angles to avoid Moire patterns. An obvious advantage of halftoning using a Blue Noise Mask (BNM) ' is that there are no conventional screen angle or Moire patterns produced. However, a simple strategy of employing the same BNM on all color planes is unacceptable in case where a small registration error can cause o...

Color descriptors are among the most important features used in image analysis and retrieval. Due to its compact representation and low complexity, direct histogram comparison is a commonly used technique for measuring the color similarity. However, it has many serious drawbacks, including a high degree of dependency on color codebook design, sensitivity to quantization boundaries, and ineffici...

background: there have been numerous researches on ozone application in dentistry; yet the data regarding its whitening effect is very limited. the present study compares the bleaching effect of ozone with offi ce bleaching. materials and methods: in this experimental study, 15 maxillary premolar teeth were selected and sectioned mesio-distally and bucco-lingually. the sections were then placed...

Zusammenfassung Es ist von höchster wissenschaftlicher Relevanz, Biosensoren in Lab-on-Chip-Systeme zu integrieren. Die Integration der Sensoren die Zellkultursysteme ermöglicht direkte Messung biologischen und physiologischen Parameter während des Zellwachstums. erfordert ein spezielles Design mikrofluidischen Chips eine Mikrostrukturierung leitfähigen Materialien. In dieser Arbeit präsentiere...

Background and Aim: Color match between prosthetic restorations and natural teeth is challenging in dentistry. The aim of the current study was to assess the effect of accelerated aging on color stability of two silica-based ceramics with leucite and lithium disilicate crystalline phases after glazing and polishing surface treatments. Materials and Methods: In this experimental study, 30 disc-...

In this paper, a novel color space transform is presented. It is an adaptive transform based on the application of independent component analysis to the RGB data of an entire color image. The result is a linear and reversible color space transform that provides three new coordinate axes where the projected data is as much as statistically independent as possible, and therefore highly uncorrelat...