at many circumstances, in heat exchange processes several exchangers were used with different cost laws due to their pressure ratings, materials of construction and exchange3r types. in such circumstances traditional methods of pinch technology can not be led to minimum total annual cost may cause some other disadvantages like more complexity or higher maintenance. in this research work a new a...

this paper presents a model for constrained multiobjective optimization of mixed-cropping planning. the decision challenges that are normally faced by farmers include what to plant, when to plant, where to plant and how much to plant in order to yield maximum output. consequently, the central objective of this work is to concurrently maximize net profit, maximize crop production and minimize pl...

The purpose of this paper is to find of the theoretical results of fixed point theorems for a mixed monotone mapping in a metric space endowed with partially order by using the generalized Kanann type contractivity of assumption. Also, as an application, we prove the existence and uniqueness of solution for a first-order ordinary differential equation with periodic bou...

............................................................................................ iii Acknowledgment .................................................................................. v Dedication .......................................................................................... vi Table of contents ................................................................................

visual training includes special practices that improve eye performance of control and coordination. this training is used to enhance visual function in sports performances. the aim of this study was to examine the effect of a visual training course on volleyball serve reception skill. 40 high school students (17-19 years old) were selected randomly and divided into four groups: visual training...

Mixed-initiative assistants can be applied to a variety of information-rich problem-solving tasks on the Web, such as travel planning and equipment purchasing tasks. A mixed-initiative environment for such tasks can greatly improve the decision making environment for a user if the application is designed to meet the needs of a user. However, each user has different needs and preferences, making...

Krein [1] mentioned that for each PD equation we have two extreme operators, one is the minimal in which solution and its derivatives on the boundary are zero, the other one is the maximal operator in which there is no prescribed boundary conditions. They claim it is not possible to have a related boundary value problem for an arbitrarily chosen operator in between. They have only considered lo...

Risk is an inherent factor in the traveler's choice of destination. Tourism destinations differ in many aspects including their location, economic condition, cultural and political status and crime. Given such differences, the analysis of destination risk and its dimensions is of substantial interest. The current study explores the risk factors perceived about Iran as a tourism destination usin...

mixed malaria infections, plasmodium falciparum and p. vivax, are suspected to occur at a greater frequency than is detected by conventional light microscopy. in order to determine the year round pattern of transmission and the frequency of mixed infections in malaria endemic area, we carried out a prospective comparison of diagnosis by conventional light microscopy and nested pcr in chahbahar ...