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• Examination of an Office Building's Energy-Producing Opportunities Using the Temperature Frequency Curve

  63-67

  Sándor Reho

  Views:

  78

  In our study we would like to choose the energy generating system for a business center in Mátészalka. The
  system will cover the heating energy demand of shops and offices of the building. The heat demand of the building
  was calculated by a computer program. The energy demand was calculated with help of the Temperature
  Frequency Graph. In our study we choose bolilers and heat-pumps. We compared their operating costs.

• Solid-Lattice Stem Optimization Design for Hip Implants

  39-46

  Kleber Leonardo Castro Vera

  Mustafa Al-Jweijati

  Views:

  398

  The goal of this study is analyzed and design a methodology to reduce stem mass, through topology and lattice optimization of a Ti-6Al-4V hip implant, meeting yield stress requirements. Four optimization cases were studied: Topology optimization (1), Lattice design 100% (2), Lattice design 50% (3), Lattice design 25% (4). Five load cases from a study were applied for each optimization cases: Combined (LC1), standing-up (LC2), standing (LC3), going up stairs (LC4), jogging (LC5). The optimized cases design reduced stem mass approximately by 30% (1), 5% (2) ,8% (3) and 2% (4), compared with the total stem hip Ti-6Al-4V implant.

• Designing, Modelling and Analysis of Straight Turning Tool Geometry

  11-16.

  Csaba Nemes

  Sándor Bodzás

  Views:

  124

  We execute the planning, modelling and examination of straight turning tool geometry with the help of a software in the modelling space. Our aim is to create a programme that – given some lengths and angles – calculates the corresponding geometry. It establishes that as a wireframe model in a file format that is easily transmittable to the CAD softwares of today, so any additional changes can be done there. An optimal geometry can be defined for the best possible chipping conditions using finite element simulation and with given technological parameters and material quality standard.

• Comparative Analysis of Equestrian Facilities in the North Great Plain Region

  79-93

  Anetta Müller

  Zoltán Bács

  Éva Bácsné Bába

  János Oláh

  Christa Pfau

  Anikó Molnár

  Views:

  392

  Equestrian services appear in recreation, sports and tourism as well. The favorable natural and cultural values of Hungary and the image of the equestrian nation based on the traditions of the horse provide a favorable background for the development of supply elements. The lowland character and horse culture of the Northern Great Plain region, and the continuous development of horseback riding services here, reinforces the equestrian supply element in the field of sport and leisure. Our in - depth interviews were conducted among service providers with a “horseshoe rating” (N = 11) operating in the Northern Great Plain Region. The results show that all service providers consider and plan the development of equine, infrastructure and human resources, although the source of its financing is different (from state, other successful businesses, realized business results of equestrian enterprises). Equestrian service providers with no horseshoe rating have identified the improvement of quality, the 3, 4, and 5 horseshoe qualified service providers for the expansion of the complex program offering and product diversification.

• How Does Public Debt Change when the Next Crisis Comes - and It Will Come!/the Expected Evolution of Greece's State Debt in the Next Crisis Period/

  91-104

  László Török

  Views:

  227

  It has recently been announced that Greece may withdraw from the Euro-Zone permanent rescue fund's aid program because it has successfully met the conditions imposed on it. Creditors and credit qualifiers also agreed that the Greek economy was on a good growth path. That is why there is a chance that by 2030 the current sovereign gross debt of 182.7 per cent of GDP will fall to 123.3 per cent. The author finds this statement unfoundedly optimistic. He argues that the Greek debt ratio – despite the current optimum economic fundamentals – does not seem to be sustainable. He sees greater probability that in the near future it will again be necessary to release some of the Greek debt. Debt reduction will also mean a new orderly state bankruptcy. The study seeks to highlight how vulnerable and risked the sustainability of current Greek debt financing. Using a macroeconomic model, it shows and justifies how the Greek sovereign debt changes in the case of a crisis that is only half the extent of the previous subprime crisis. If this happens, by 2023, the state debt will rise to more than double the national product, and by 2030 only to the present, otherwise critical, level. It follows that the high risk of financing Greek state debt remains unchanged.

• Analysis of Thermal Degradation in the Annealing Process of Colored Parts Built by Extrusion-Based 3D Printing

  124-133

  Kleber Leonardo Castro Vera

  Leonardo Santana

  Jorge Lino Alves

  Views:

  366

  With the ever-increasing request of light materials, poly lactic (acid) PLA, have got much in consideration. Low-cost PLA materials have risen its use. Those possess some benefits but nevertheless insufficient mechanical strength. The printed PLA objects have a stumbling block for practical applications. Thus, annealing is an interested alternative to make 3D printed objects strong. This thermal treatment can significantly develop investigational studies and offer technical data. Hence the purpose of this paper is study and discuss how to increase the flexural strength through annealing process. Geometry distortions and color degradation will be analyzed. Differential Scanning Calorimetry, Taguchi Method (TM) and variance (ANOVA) were applied as part of the design experiments and analysis. Twenty-seven printed specimens were tested and factors as temperature, time and color were selected.

• Kinematics and Workspace Analysis of Parallel Manipulators

  1-5

  Dávid Bodnár

  Sándor Hajdu

  Views:

  111

  The aim of the study is to analyse the kinematics and the workspaces of two parallel manipulators. The kinematics are calculated using vectors and the Newton method. The workspaces are shown using constant orientation. The result of the study is that the kinematics and workspaces are comparable of the two manipulators. MATLAB was used for calculating.

• Secondary School Workshop About Dynamics Supported by Computer Software

  84-90

  Gusztáv Áron Szíki

  Views:

  82

  In the framework of the “Debrecen Venture Catapult Program (EFOP-3.6.1-16-2016-00022)” the colleagues of the Department of Basic Technical Studies of the Faculty of Engineering of the University of Debrecen worked out workshops for secondary school students. One of the above mentioned workshops is the „Dynamics workshop supported by computer software”, the topic of which is the experimental and theoretical study of dynamic problems using highly developed computer software. Apart from describing the above mentioned workshop and the experiences related to it, we also present the reactions of the students, and describe how the workshop contributes to their widening knowledge.. Furthermore, we also analyse what knowledge, skills and information students would need to be more creative, motivated and initiative and this way more successful in their studies and at work, as well as in their everyday lives, in the field of engineering. In the end, as a conclusion, we make recommendations concerning further improvements of the workshop.