In some cases the optimum is the minimum of the objective function (mathematical optimum), but in other cases the optimum is given by a technical constraint (technical optimum). The present paper shows the both types in two problems. The first problem is to find the optimum dimensions of a ring-stiffened circular cylindrical shell subject to external pressure, which minimize the structural cost...

Many studies are performed by researchers about Shell and Tube Heat Exchanger but the Multi-Objective Big Bang-Big Crunch algorithm (MOBBA) technique has never been used in such studies. This paper presents application of Thermal-Economic Multi-Objective Optimization of Shell and Tube Heat Exchanger Using MOBBA. For optimal design of a shell and tube heat exchanger, it was first thermally model...

the islamic revolution helped develop a new discourse and semantic system. one of the methods to study or analyze the political phenomena is critical discourse analysis namely, that of laclau and mouffe›s discourse, the most pertinent. this article examines its main question whether the values of the islamic revolution concepts and identity are constructed, spread and articulated according to l...

The term ‘shock’ has been central to accounts of the origins of technological and artistic modernity. Its appearance ranges from Baudelaire’s use of the term to describe urban experience in the 1860s and the phenomena of ‘railway spine’ in the same decade to the psychology of shell-shock; from the aesthetic categories of Krakauer, Benjamin and Brecht in the inter-war period to later titles like...

Over the past decade, and particularly the past five years, a quiet revolution has been building at the border between atomic physics and experimental quantum chemistry. The rapid development of techniques for producing cold and even ultracold molecules without a perturbing rare-gas cluster shell is now enabling the study of chemical reactions and scattering at the quantum scattering limit with...

the present study was carried out to investigate the effect of corn replacement by different levels of wheat with supplementation of phytase with reduced phosphorus level for laying hens. two hundred seventy nine layer hens (the strains of hy-line w36) at the 53th week of age, selected based on the same egg production percentage and body weight, assigned in a factorial arrangement with complete...

The need to handle distributed computing in a general manner leads us to structure our operating systems functions in a much more modular way than it is done in today’s systems such as current UNIX kernels, and to provide facilities for dynamic reconfiguration so the system can be adapted to the variety of configurations needed in a distributed system. When applied to the UNIX kernel, such a "r...