This article presents the study of three-dimensional, stagnation flow of a Powell-Eyring fluid towards an off-centered rotating porous disk. A uniform injection or suction is applied through the surface of the disk. The Darcy law of porous disk for Powell-Eyring fluid is also obtained. The governing partial differential equations and their related boundary conditions are converted into ordinary differential equations by using a suitable similarity transformation. The analytical solution, of the system of equations is solved by using homotopy analysis method. The convergence region of the obtained solution is determined and plotted. The effects of rotational parameter, porosity of the medium, the characteristics of the non-Newtonian fluid and the suction or injection velocity on the velocity distributions is shown by graphical representation.
Iranian domestic tradition such as privacy and hospitality plays a significant role in shaping the Iranian traditional housing. However, studies on modern architecture have rarely focused on the house architecture, which has been adapted based on domestic tradition. The aim of this study is to understand how some features of local traditions, like privacy and hospitality, influenced housing development during the modernization period in Tehran. To this end, through a qualitative approach and data collection methods, this study identifies traditional values in modern housing. By categorizing the new house typology into detached houses, row houses, and high-rise apartments, the study discovers how architecture enables the consideration of privacy and hospitality in the physical form of modern houses. As a result, the new organization partly belonged to the traditional architecture and partly became unique as an Iranian modern house.
Apart from the strength requirements, modern lighting pole designs have to meet a number of safety requirements in the event of collisions. The paper compares the experimental tests performed at the collision test track according to EN 12767 with the results of the numerical analysis carried out in Ansys LS-DYNA. The objective of the work is to prepare a new structure of a thin-walled lighting pole of steel which minimizes absorption of the kinetic energy of the vehicle and, simultaneously, its production costs are comparable to those of a standard pole. The tests were carried out at an impact speed of 100 km/h.
In this article we studies BVP’s that can not be solved as P.V.I or BVP with Matlab solvers ODExx or BVPxx since the solutions do not have limit in 0. We propose a numerical algorithm based on Cubic-spline written in Maple 16 .
The purpose of the article is to show the practical side of reverse engineering.Many times during the process of optimizing parts, before we intervene in the tool that produces them, we want to makesure that the optimization will work in practice.For this purpose, currently, we often use 3D printers. Unfortunately, they introduce distortions of geometry to the printed prototyperesultingfrom the technology of its production.
With the uptake of the IoT in the industrial domain, a whole new range of cyber-physical systems has emerged; Industry 4.0 is the title given to this technological domain of highly interconnected, data-rich systems. To aid the development of such systems, a range of reference architectures has been developed throughout the years. This paper reviews a number of recent reference architectures, detailing their essential traits as well as identifying aspects that need to be further explored in order to obtain reference architectures better tuned to generating cyber-physical social systems.
In this paper we proposed to identify the optimum milling parameter required for finishing processes performed on 3Dprinted parts from ABS and PLA materials. We have identified the optimum milling parameters for a constant spindle speed of 3500 rot/min for face milling and profile contouring operations with different tools diameters. The study was performed on 3D printed specimens from ABS and PLA materials.
Jørn Utzon, the Danish architect genius would be 100 years old in 2018, and he passed away exactly 10 years ago. Although, he produced an unparalleled professional output (including a number of implemented projects, many not built plans and some writings) on five continents, he has remained relatively less known worldwide in general, and virtually unknown in Central and Eastern Europe in particular. The paper intends to salute his achievements with reviewing his life and professional carrier with some selected projects, including his ’brand’, his impact and some lessons for contemporary professional practice. It is largely based on my recent research that concludes in the publication of a monography, due in December 2018, in Hungary.
Demand for thin-walled structures has been increasing for many years. Cold- formed, thin-walled channel beams are the subject of presented research. The local elastic buckling and limit load of these beams subjected to pure bending are investigated. This study includes numerical investigation called the Finite Strip Method (FSM). The presented results give a deep insight into behaviour of such beams and may be used to validate analytical models. The number of works devoted to the theory of thin-walled structures has been steadily growing in recent years. It means that is an increasing interest in practical methods of manufacturing cold-formed thin-walled beams with complicated cross-sections, including also beams with web stiffeners. The ratio of transverse dimensions of beam to its wall-thickness is high, therefore, thin-walled beams are prone to local buckling that may interact with other buckling modes. The stability constraints should be always considered when using cold-formed thin-walled beams.
Reykjavík’s largest church, Hallgrímskirkja has become a symbol and an important part of Icelandic national identity. This edifice result of conscious planning process with its location and form reinforce its national significance. Its impact derives from several elements. Buildings symbolizing the identity of communities are usually quite conservative in form. Hallgrímskirkja, however, has distinct individual features that stem from architect Guðjón Samúelsson’s aspiration to express the nation’s identity in a specific architectural form.