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• Examining Used and Sportswear Supply Chain Strategy and Indicators

  86-98

  Gergely Maklári

  Csanád Sipos

  Views:

  318

  The following study presents the supply chain strategy of a second-hand and sportswear company in Hungary. The study discusses the main tasks of supply logistics, the level of logistics service, the main determining elements of the level of logistics service, and the measurement of customer satisfaction. From the first step of the process, we can fully follow the processes until the last activity. We can learn in detail about the sub-processes, such as: types of clothing collection, sourcing, warehousing, selection, disassembly, processing, receipt of goods and sales. The aim of the study is to make the processes more transparent for everyone.

• Defect Analysis of Bearings with Vibration Monitoring and Optical Methods

  1-12

  Krisztián Deák

  József Menyhárt

  Levente Czégé

  Views:

  290

  Diagnosis of bearings with advanced methods gained remarkable roles in the previous years. This article focuses on the manufacturing defects and methods to reveal and classify them. During manufacturing several faults could emerge because of the grinding operation, tool wear and chatter vibration. Inproper handling of the bearing parts because of the collosion to each other and the storing box that causes deformation. To reveal these problems several methods are applied in industry. For deeper surface analysis nitric acid can be used to initate the finished surface of the roller then natrium-carbonate that nautralize the elements. Vibration analysis in its standard Fourier form is not a new achivement but other mathematical tools could be applied to condition monitoring such as wavelet transform. It is an efficient tool for analyzing the vibration signal of the bearings because it can detect the sudden changes and transient impulses in the signal caused by faults on the bearing elements. In this article five different wavelets, Daubechies, Gaussian, Coiflet, Mexican hat, Meyer are compared according to the Energy to Shannon Entropy ratio criteria to reveal their efficiency for fault detection.

• Comparison of greywater treatment processes with coagulating agent and oxidizer

  99-106

  Csaba Ungvári

  Andrea Izbékiné Sazabolcsik

  Réka Lós

  Ildikó Bodnár

  Views:

  227

  In our research synthetically produced greywater samples were treated with oxidative and coagulating agents after pre-treatment them by filtration on various filters. We characterised the quality of greywater samples with several parameters. We investigated these parameters on the untreated, pre-treated, and treated samples as well. We evaluated the efficiency of the treatments by measuring the characteristic parameters. The greywater treatment is a very important and effective opportunity for the reasonable freshwater usage. This type of treated water can be suitable for toilet flushing or irrigation. There are a several methods known from the literatures to preparation the greywater samples to reuse. We compared two of these methods in this article.

• Control Valve Testing During Operation

  11-18

  R. Kokas

  Views:

  198

  The most commonly used control technology in building engineering is mixing. The purpose of the measurement is to find out what effects have the different control valve position combinations on the system. How the mixing efficiency changes in these cases.

• Investigating the Development Impact of the Reorganized Quality Control System on One of the Public Service Provider’s Pers

  226-241

  László Fenyves

  József Gályász

  Views:

  204

  At the investigated public service providers’ personal customer service they did significant changes were made in the field of quality control since April 2017. A method which existed and was used for a long time was modified, which had one of the most important objectives from a management aspect to help the development of the administrators in order to provide high quality. During our research we mostly focused the development impact of the modified system. We wanted to obtain an answer whether the new system is better for promoting the development of the administrators than the former method and to what extent administrators require feedback related to their job as well as whether this system is properly inspected and controlled by leaders. During the research we targeted three focus points related to the development aspect: self-check, constructive feedback and the degree to which seated work is controlled. Based on the results of the investigation we draft such suggestions which can promote efficiency if necessary and possibly even make the operation of the system more efficient.