This paper presents the occurrence, properties and origin of chromium, nickel and cobalt in environmental samples soil, water and the atmosphere. Methods of determining the above-mentioned elements and ways of preparing environmental samples for chemical analyses are presented. The content of chromium, nickel and cobalt in the atmosphere, naturally occurring waters, and soil is shown, along wit...

A new priority queue structure is introduced, for which the amortized time to insert a new element isO(1) while that for the minimumextraction is O(logK). K is the average, taken over all the deleted elements x, of the number of elements that are inserted during the lifespan of x and are still in the heap when x is removed. Several applications of our structure are mentioned.

Two types of lenses can focus light: an optical lens using refraction phenomenon and a diffractive lens using diffraction phenomena. Table 1 shows the characteristics of each lens. The focal length of the diffractive lens is controlled by the structures of the lens, as mentioned in detail in Section 2.2. This suggests that the focal length of the diffractive lens is independent of refractive in...

The ancient Vedic texts Provides us with valuable information and guide lines on various multi-faced aspects of human life. The present discussion is limited to the medical treatment and medicinal charms mentioned in the Atharvanic literature with specific consideration to Kausikasutra for better understanding of the rites and actions mentioned in Atharvanaveda.

Objectives The aim was to identify theoretically expected as well as actually reported benefits from drug development and the importance of individual patient benefits compared to the collective benefits to society in general. Background Ethical guidelines require that clinical research involving humans offer the potential for benefit. A number of characteristics can be applied to define rese...

the aesthetics of the stories of holy quran means identification of beauty and art in its expression. the quran is not a book of fictions, but its real stories, with religious and educational purpose, have artistically been expressed, with a rhetorical style and dynamic images that one can realize its artistic aspects in content and structure. the geometric structure of its stories makes it pos...