Natural convection heat transfer from a tube bundle in the indirect water bath heaters is investigated. A computer-code is used for the solution of the governing equations of mass, momentum and energy transfer based on the SIMPLE-C algorithm. Simulations are carried out for the gas pressure station heater of Kermanshah city with various tube bundle arrangements. In order to validate the numeric...

A novel algorithm based on LQR approach is presented to optimally tune the gains of a PI controller of a first order plus time-delay system. In this algorithm the weighting matrices Q and R of the cost function are adjusted by the natural frequency and damping ratio of the closed–loop system. In order to prove the optimality of this algorithm, it is applied to a servo-hydraulic actuator with no...

The ability to reason with equations is important in many computer science applications, including algebraic specifications, highlevel programming languages, and automated deduction. Reasoning about equations may, for example, involve deciding if an equation "'follows" as a consequence of a given set of equations, or if an equation is "true" in a given model, or what values of the variables sat...

This corpus-based study aimed at exploring the most frequently-used academic words in linguistics and compare the wordlist with the distribution of high frequency words in Coxhead’s Academic Word List (AWL) and West’s General Service List (GSL) to examine their coverage within the linguistics corpus. To this end, a corpus of 700 linguistics research articles (LRAC), consisting of approximately ...

Determination of maximum rivers flow resulted from surface runoff in watersheds without adequate hydrometric records is based on rainfall-runoff models. The short duration rainfalls are one of the basic elements to apply these models. The access to quantitative and intrinsic worth storm data is restricted around the word and in Iran too. There are several empirical and statistical methods to es...

word of mouth communications in marketing is one of the important informal communication tools between consumer of goods, service and organizations which is appointed with the researchers. the purpose of this study is to determine the relationship between locus of control with word of mouth communication between students of isfahan university. this is a survey study which it is samples were 243...

In some algorithms, segmentation of the word image considers the first step of the recognition processes; the main aim of this paper is proposed new fusion equations for improving the segmentation of word image. The technique that has used is divided into two phases; at the beginning, applying the Arabic Heuristic Segmenter (AHS), AHS uses the shape features of the word image, it employs three ...