Volume 1/ Issue 4

FITTING OF HYPERBOLOID
Sebahattin Bektas

In this paper, we present hyperboloid fitting which are based on minimizing the sum of the squares of the geometric distances between the noisy data and the hyperboloid. The literature often uses “orthogonal fitting” in place of “best fitting”. For many different purposes, the best-fit hyperboloid fitting to a set of points is required. Algebraic fitting methods solve the linear least squares (LS) problem, and are relatively straightforward and fast. Fitting orthogonal hyperboloid is a difficult issue. Usually, it is impossible to reach a solution with the classic LS algorithms. Because they are often faced with the problem of convergence. Therefore, it is necessary to use special algorithms e.g. nonlinear least square algorithms. We propose to use geometric fitting as opposed to algebraic fitting. Hyperboloid has a complex geometry as well as hyperboloid structures have always been interested. The two main reasons, apart from aesthetic considerations, are strength and efficiency.

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POTENTIAL OF USED MOBILE PHONES AND THEIR MATERIAL ASSESSMENT
Klaudia Šándorová, Jana Šoltész Matulová

The current development of telecommunication technology is one of the fastest growing field of electrical engineering. The world telecommunication industry is producing an increasing amount of new technologies for mobile phones, which also results in pressure on users for their more frequent replacement. The mobile phone that finished its life cycle becomes discarded. There is an effort to minimize the electronic waste, to not end up in landfills and do not pose a potential danger to environment. The aim of this work is to evaluate the current possibilities to recycle components of discarded mobile phones, materially evaluate this type of waste and suggest possible solutions.

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Securing of fluent running of production process depends from the level of assets that means machinery and equipment that are used in the firm. Permanent care for equipment of the firm and economical operating with assets brings high service cost and therefore it is necessary to follow up state of the machinery and production equipment, their physical respectively moral depreciation, to find out ways for equipment renovation and to optimization interval of their real durability. Process of renovation can be followed up from the view of management through quantitative models of operation research that enable managers to optimization interval of equipment renovation. In this paper we deal with optimization of biomass boiler.

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