to find the quantity and quality of wastewaters of the two main industrial units of khoy city in west azerbaijan province, iran, namely the slaughterhouse and the totia chocolate factory, ten composite samples were taken in 112 hour intervals between 3.5 and 7.5 a.m. (4 hours working shift) from the slaughterhouse and between 7.5 a.m. and 2 p.m from the totia chocolate factory (8hours working s...

Amine intercalated titanates were synthesized by direct exchange of potassium ions of K2Ti4O9 by alkyl ammonium ions of various alkyl chain lengths. These intercalated solids exfoliate well in alcohols of different alkyl chain lengths and non-polar solvents such as toluene and hexane to yield colloidal dispersions of titanate nanosheets. The longer the alkyl chain of the intercalated amine the ...

One of the most important problems to solve in Solid Modeling is computing boolean operations for solids (union, intersection and difference). In this paper we present a method to obtain the boolean operators based on covering the solids by simplices without evaluating the boundary. The representation of the obtained solid does not correspond with the minimal boundary of the solid, but using th...

The objective of this work is studying the use of chemicals to enhance primary treatment in municipal wastewater treatment plants, thereby reducing the cost of the secondary treatment stage. Jar tests using chemicals, polymers and sea water have been conducted to determine the best performing chemicals, alone and in combinations. The process performance parameters studied were pH, type and dosa...

Vibrational excitations can exist in non-linear systems which have no counterpart in the corresponding linear systems. In this paper we investigate such excitations in systems where the non-linearity is of an on-site character. In particular, we analyze the existence conditions for localized (and delocalized) excitations, and their interaction with external fields. In this paper we discuss the ...