the distribution of the allophones of /?/in certain contexts involves free variation and gradient preferences. an organized survey was conducted to elicit the judgments of 37 native persian speakers concerning the well-formedness of /?/allophonic behavior in five different phonological positions. the results showed that the differences in judgment between the various categories are not just t...

S-shaped incentive schemes and pay caps are fairly common in practice. This paper demonstrates the optimality of s-shaped incentive schemes and pay caps by incorporating salespeople’s aversion to pay inequity into the standard agency model. Our analysis shows that salespeople’s desire for pay fairness increases the convexity of the optimal incentive scheme at small sales but increases the conca...

This reaction allows for new olefins to be synthesized and used as raw materials in polymers, perfumes, drugs and agrochemical industrial products, also serving as the starting point for more complex organic molecules. Catalytic systems are based mainly on the metals W, Mo, Re and Ru. The metal-alkylidenes synthesized by Schrock, [Mo(CHR)(NAr)(OR f ) 2 ], Grubbs, [Ru(CHR)(PCy 3 ) 2 Cl 2 ], Herr...

In this paper we introduce the optimal solution for a simple and yet practical inventory policy with the important characteristic which eliminates the uncertainty in demand for suppliers. In this new policy which is different from the classical inventory policies, the time interval between any two consecutive orders is fixed and the quantity of each order is one. Assuming the fixed ordering cos...

The interplay between olefin metathesis and dendrimers and other nano systems is addressed in this mini review mostly based on the authors' own contributions over the last decade. Two subjects are presented and discussed: (i) The catalysis of olefin metathesis by dendritic nano-catalysts via either covalent attachment (ROMP) or, more usefully, dendrimer encapsulation - ring closing metathesis (...

although several papers have studied no-idle scheduling problems, they all focus on flow shops, assuming one processor at each working stage. but, companies commonly extend to hybrid flow shops by duplicating machines in parallel in stages. this paper considers the problem of scheduling no-idle hybrid flow shops. a mixed integer linear programming model is first developed to mathematically form...

preemptively scheduling a set of independent jobs with release time on one processor is a historical problem. in this paper, the same problem has been considered in which objective is to minimize the mean flow time. to prepare a perfect branch-and-bound, some optimality conditions have been represented and they have been compared with the optimality conditions which have been proposed before. o...

Abstract: For a functional defined on the class of closed onedimensional connected subsets of R we consider the corresponding minimization problem and we give suitable first order necessary conditions of optimality. The cases studied here are the average distance functional arising in the mass transportation theory, and the energy related to an elliptic PDE.