The b-chromatic index φ′(G) of a graph G is the largest integer k such that G admits a proper k-edge coloring in which every color class contains at least one edge incident to edges in every other color class. We give in this work bounds for the b-chromatic index of the direct product of graphs and provide general results for many direct products of regular graphs. In addition, we introduce a l...

We investigated whether the absence of one item in a regularly spaced visual array (gap cue) captures attention in a task-set-independent fashion. Participants searched for a large target among medium-size distractors (size task) or a red target among gray distractors (color task). Target arrays were preceded by uninformative cue arrays that contained a color singleton or a gap cue. The N2pc co...

The present study was designed to determine the effects of visible mutations of large effect on developmental stability and canalization in different morphological traits, namely, sternopleural bristle number, wing length, wing to thorax ratio, ovariole number, and sex comb tooth number (SCTN) in Drosophila ananassae. We have compared the mean trait size, fluctuating asymmetry (FA) (as an index...

In connection with the preceding investigation relating to the photovisual magnitudes of the stars, photovisual and photographic magnitudes of the brighter planets have been determined by out-of-focus methods. These observations were made with the view of obtaining better values of color index. The detailed discussion will appear soon in Harvard Annals, 85, No. 4. The number of plates taken for...

Lighting plays an important role in supporting retail operations, from attracting customers, to enabling the evaluation of merchandise, to facilitating the completion of the sale. Lighting also contributes to the identity, comfort, and visual quality of a retail store. With the increasing availability and quality of white LEDs, retail lighting specifiers are now considering LED lighting in stor...

In this study human color constancy was tested for two-dimensional (2D) and three-dimensional (3D) setups with real objects and lights. Four different illuminant changes, a natural selection task and a wide choice of target colors were used. We found that color constancy was better when the target color was learned as a 3D object in a cue-rich 3D scene than in a 2D setup. This improvement was i...

Introduction The Actor Network represents heterogeneous entities as actants (Callon et al., 1983; 1986). Although computer programs for the visualization of social networks increasingly allow us to represent heterogeneity in a network using different shapes and colors for the visualization, hitherto this possibility has scarcely been exploited (Mogoutov et al., 2008). In this contribution to th...

Vitamin D deficiency in pregnancy has negative clinical consequences, such as associations with glucose intolerance, and has been shown to be distributed differently in certain ethnic groups. In some countries, a difference in the rate of vitamin D deficiency was detected in pregnant women depending on their skin color. We examined the prevalence of vitamin D deficiency (<20 ng/mL) in women in ...

BACKGROUND The purpose of this study was to evaluate the correlation among intratumoral blood flow as assessed by color Doppler ultrasonography, clinicopathological findings and the Nottingham Prognostic Index (NPI). METHODS Twenty-seven patients with breast cancer were examined. All patients received surgical treatment. Color Doppler ultrasonography was performed prior to surgery to detect a...

Color is the characteristic which is most used for image indexing and retrieval. Due to its simplicity, the color histogram remains the most commonly used method for color indexing and retrieval. However, the lack of good perceptual histogram similarity measures, the global color content of histograms and the erroneous retrieval results d.ue to gamma nonlinearity, calls for improved methods. im...