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Determination of Anionic Detergent Content in Greywater

Abstract

In this research we have improved a method for the determination of anionic detergent content (ANA) in greywater samples. Based on the earlier studies at the Department of Environmental Engineering at the University of Debrecen this new, more reliable method for ANA values is very effective. We examined the quantity of anionic detergent content in synthetic greywater samples with Hyamine reagent using a two-phased titrimetric method. We added to the synthetic greywater samples phenolphthalein indicator, acid mixed indicator and chloroform. Next, we shook the mixture, and we produced two separated phases. We titrated the mixture with cation active Hyamine reagent. It was shown that the applied method is both representative and reliable.

Open access
Development of a Pressure Measuring Unit Based on a Thermal Conductivity Gauge and a Low-Cost Embedded Solution for Mid-Range Vacuum Applications

Abstract

This study presents the development of a pressure measuring unit based on a Pirani gauge and a dedicated embedded system, incorporating a simple, low-cost practical solution for significantly reducing the various measurement altering factors, such as drifts, offsets and set point drifts. This is achieved by eliminating the conventional differential analogue signal processing stage and replacing it with a high resolution analog to digital converter. Therefore the goal was to minimize the number of the electronic components whose operation is influenced by variations in ambient temperature. The main topics discussed in the paper include the presentation of the measuring circuit’s configuration, the development of a low-cost embedded system, the calibration method and the solution implemented for eliminating the platforms limitation regarding the precision of the different mathematical calculations.

Open access
Development of A Solar Panel Auxiliary System in Order to Extend Range

Abstract

The aim of this research is to find a solution that can contribute to the more widespread use of electric vehicles and, through development, promote the use of renewable energy sources. It aims to eliminate the disadvantages of electric vehicles, such as self-discharge, stationary charging and limited range. The focus is mainly a solar-powered solution, since small solar cells have already been implemented on the commercially available Nissan Leaf model to solve similar problems but with very little or no improvement. Encouraged by this attempt I have engineered a larger, more useful auxiliary solar cell system to improve the range of these vehicles.

Open access
The Development of The Unesco World Heritage Area in Pécs

Abstract

The World Heritage of Pécs is the most valuable historical relic in the city. The conservation, presentation and continuous development is significant. The significant parts of the area are: the Cella Septichora, the Old Christian Mausoleum and the crypts in Apáca Street. Through the design process our prime task is the restoration and expansion of the former development in 2006. The study focuses on creating the Cella Septichora concept.

Open access
The Drilling Investigation of Glass Fibre Reinforced Plastic

Abstract

Nowadays the usage of glass fibre-reinforced plastics (GFRP) is increasing. The cutting of these materials entails several problems, e.g. the strong abrasive wear effect of the glass fibres or delamination effects. In this paper, we examine the results of drilling experiments on a 10 mm thick GFRP which included 26 layers. The cutting parameters were changed over a wide range. During the experiments, we measured the average surface roughness parameter (Ra). After the tests, we examined the effect of the cutting parameters on the measured roughness values. We created two types of predictive model to estimate the roughness parameter and compared their applicability.

Open access
The Early Christian Burial Sites and The Türbe of Idris Baba

Abstract

The city of Pécs was already an important commercial and religious centre in ancient times. Because of the city’s location, it has become one of the most important cultural hubs in Central Europe. In Pécs, in various historical times, many different cultures have flourished and one of the most typical imprints of these cultures are cemeteries and burial buildings. The subject of our research is to compare Idris baba’s türbe with another iconic heritage of Pécs, the Early Christian Cemetery, furthermore as an example of this cemetery’s visitor centre, designing a plan that reattaches the neglected Turkish cemetery to the city’s life.

Open access
The Effect of Atmospheric Electromagnetic Radiation on an Opened System

Abstract

In opened systems with liquid-phase (for example open-source bioreactors for various purposes) very significant temperature can be generated. The operation of the system can be impaired, possibly completely inhibited (too low, too high temperature values). The analytic description of the operation’s heat flow is needed to achieve the optimized operation and to block the thermodynamic inhibition. The aim is to examine the inner system opportunities and the auxiliary energy. The estimates values quantify the effects of atmospheric electromagnetic radiation on opened systems. Based on the developed model by increasing the complexity of the method, it is appropriate to describe the heat flow of opened systems and to explore the energy integration possibilities.

Open access
Evaluation of Suppliers at A Steel Structure Manufacturer

Abstract

In today’s world, where competition is becoming increasingly prominent, companies need to focus on several aspects in order to be successful in their operations. Purchasing is essential to achieving this goal, so suppliers can be evaluated as well. A new approach is created based on the QFD method for evaluating suppliers, which can be quickly and easily performed, even without the help of a computer. This method was tested in a company based in a North Eastern Hungarian city. Firstly, suppliers were selected by ABC analysis and then the expectations were defined and compared based on the order of their preference matrix. The three categories were A, B and C, one supplier achieved a place in the best category, two suppliers a place in the second category, five suppliers joined the third category. Furthermore, Suppliers were categorized by Kraljic matrix. The supplier rating which was based on the QFD (Quality Function Deployment) method, allows analysis of the performance of a given supplier in an easy way within the company and to develop them over the long-term in order to make the company more successful based on the results of combined work.

Open access
Examination of Spot Welded Seam of a Car Body

Abstract

Spot welding is widely used in car industry to create a cheap and light body and chassis. Engineers tend to use spot-welding in order of reducing the production costs, also lowering the stress intensity which can cause failure and fractures of the body or chassis. Our goal here is to examine spot-welding of a car body with different tests and find out later if there is a possibility of using a different technology that can produce a better seam that can be automated with industrial robots.

Open access
Experimental Dynamical Analysis of The Material Properties of Test Pieces Made by Additive Production Technologies

Abstract

The recent years, 3D printing has become a hot topic, however, it’s hard to design parts without a deep understanding of the material properties. The aim of this study is to estimate the modal parameters and the damping properties via experimental dynamic analysis of a part made from PLA. We will study the effects of the different directions of printing. With the results we can provide data for FEM software input.

Open access