The notion of Asteroidal triples was introduced by Lekkerkerker and Boland [6]. D.G.Corneil and others [2], Ekkehard Kohler [3] further investigated asteroidal triples. Walter generalized the concept of asteroidal triples to asteroidal sets [8]. Further study was carried out by Haiko Muller [4]. In this paper we find asteroidal numbers for Direct product of cycles, Direct product of path and cy...

previous electronic commerce (ec) studies have found thatconsumer characteristics are important when considering issues related tothe acceptance of online shopping. however, most studies have focusedon a single product or similar products. the effects of different producttypes have been relatively neglected. to overcome this limitation, thepurpose of this study was to explore the effects of dif...

The removal of dissolved organic carbon (DOC) is a key factor in the control disinfection by-product (DBP) formation drinking water. Ion exchange process deals with naturally negatively charged matter. A fluidized bed column test has been chosen to parallel efficiency 4 different anionic resins (Purolite PPA860S, Dowex TAN-1, Amberlite IRA-958 and IRA-410) terms DOC fraction related DBP reducti...

Stripper columns are used for sweetening crude oil, and they must hold product hydrogen sulfide content as near the set points as possible in the faces of upsets. Since product    quality cannot be measured easily and economically online, the control of product quality is often achieved by maintaining a suitable tray temperature near its set point. Tray temperature control method, however, is n...

selecting a set of features and price for new product is one of the most important and difficult decisions for any firm. for its implementation firms require information by demand of consumers about product features,the cost of providing these features and reaction of existing competitors to new product entry. in this research, with the help of game theory, the various positions of new product ...

this study aims to minimize the total cost of a four-echelon supply chain including suppliers, an assembler, distributers, and retailers. the total cost consists of purchasing raw materials from the suppliers by the assembler, assembling the final product, materials transportation from the suppliers to the assembler, product transportation from the assembler to the distributors, product transpo...

in this note first by considering the notion of general fuzzy automata (for simplicity gfa), we define the notions of direct product, restricted direct product and join of two gfa. also, we introduce some operations on (fuzzy) sets and then prove some related theorems. finally we construct the general fuzzy recognizers and recognizable sets and give the notion of (trim) reversal of a given gfa....

in this paper, we introduce the concepts of right, left and product stabilizers on hoops and study some properties and the relation between them.  and we try to find that how they can be equal and investigate that under what condition they can be filter, implicative filter, fantastic and positive implicative filter. also, we prove that  right and product stabilizers are filters and if they are ...