<abstract xmlns="http://www.w3.org/1999/xhtml"> Our study is focused on solution opportunities of national road freight transport in a selected company in terms of performance utilisation of vehicles. The indicators of time and performance utilisation of lorries and their trailer units are used for analysing the transport company. Based on correlative assessment, it is possible to determine the effects of year-to-year performance variations of vehicles in terms of running performances, transport performances, average travel distance and average loading.</abstract>

Assessment of a Transport Company in Terms of Performance Utilisation of Vehicles

<abstract xmlns="http://www.w3.org/1999/xhtml"> Currently manufactured tractors are equipped with a three-point hitch, which is used to connect semi-mounted implements to the tractor. The tractor three-point hitch is operated hydraulically, using various types of control. The most commonly used control is a force, positional and a mixed one. Each of these types of control has its specific characteristics and some advantages and disadvantages. Finally, each type of control is suitable for certain soil and terrain conditions. Particular attention was paid to a force control, which is improving the use of the tractor with a mounted implement, but on the other hand, adversely affects the uniformity of working depth of implements on soils with variable resistance. Based on theoretical analysis and experimental measurements, there has been determined the effect of soil resistance on the tillage depth, depending on initial conditions for implement deepening. Initial conditions for implement deepening are given by the tillage depth, soil resistance, and the cutting width of a plough. It was found that soil resistance strongly affects the tillage depth, and with increasing soil resistance the tillage depth decreases non-linearly. A gradual increasing of soil resistance is associated with a less-marked decreasing of the tillage depth. These facts will be further used in research, development and experimental verification of new control systems of the three-point hitch of tractors.</abstract>

Soil Resistance and its Impact on Tillage Depth

<abstract xmlns="http://www.w3.org/1999/xhtml"> This paper deals with the importance of fuel economy in road freight transport. It provides the calculation of financial savings for fuel savings of 0.5 l per 100 km. In the subsequent part, some factors that influence the fuel consumption are specified, e.g. aerodynamic resistance, rolling resistance, and tyre inflation pressure. The effect of tyre inflation pressure on fuel economy has been tested on four selected towing vehicles. Based on the results obtained, it can be stated that tyre pressure has a great impact on fuel consumption. A one-bar pressure reduction of tyres can increase the fuel consumption by 0.5 l per 100 km.</abstract>

Evaluation of Fuel Consumption in Road Freight Transport

<abstract xmlns="http://www.w3.org/1999/xhtml">This paper focuses on the implementation of a new exhaust-emission measurement system of motor vehicles equipped with a petrol engine and an advanced emission system. Our study deals with new methods of emission inspections using on-board diagnostics in order to increase the efficiency of emission inspection itself. The aim of implementing the new method of emission measurement is to eliminate vehicles that contribute to air pollution with emissions, due to an insufficient technical condition of the petrol engine fuel supply system.</abstract>

Slovak University of Agriculture in Nitra, Slovakia

Slovak University of Agriculture in Nitra, Slovakia2

Implementation of a New Methodology of Emission Inspections in Motor Vehicles with an Advanced Emission System

<abstract xmlns="http://www.w3.org/1999/xhtml"> This paper presents the results of analyses of ecological synthetic oil samples during an operating test. The operating test of oil was performed within cooperation of the Department of Transport and Handling and Slovnaft, a. s. (joint stock company). The analysis of ferrographic samples was performed in the laboratory of the department, and other analyses were done in an accredited Wearcheck Laboratory at Almásfüzitő, Hungary.</abstract>

Analysis of Synthetic Oil Samples During an Operating Test

<abstract xmlns="http://www.w3.org/1999/xhtml"> The paper describes the comparison of braking properties of summer and winter tyres on a vehicle Škoda Octavia II, 2.0 TDI (103 kW), with summer tyres Michelin Pilot Primacy 225/45 R17 91W and winter tyres Dunlop SP Winter Sport 3D 195/65 R15 91T. Testing was done in summer on a dry asphalt road and in winter on a snowy asphalt road with compacted snow without gritting. A device for the measuring of deceleration was XL Meter Pro Alpha.</abstract>

Comparison of Summer and Winter Tyres on a Dry and Snowy Surface

<abstract xmlns="http://www.w3.org/1999/xhtml"> The issue of material flows requires resolving a wide range of answers to questions that are part of material handling. It is important to know what the subject of handling is, what means a given material will be handled with, in what amount and time, by what route, and how this handling will be performed. We must not forget the costs involved, either in handling or storage. The answer to these questions is given by the analysis of material flows, which is dealt with during the optimisation of material handling in Bang Joo Electronics Slovakia spol. s r. o. (private limited company).</abstract>

Analysis of Material Flows in a Selected Company

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Acta Technologica Agriculturae

 Acta Technologica Agriculturae (ATA) is an international scientific journal focused on agricultural engineering. The journal is multidisciplinary and publishes a wide range of original research and review articles in engineering, agricultural and biological sciences, and materials science. All submitted articles considered suitable for ATA are subjected to rigorous double-blind peer review to ensure the highest levels of quality.  The journal Editorial Board welcomes manuscripts in both fundamental and applied research areas and encourages submissions which contribute novel and innovative insights to the field of agricultural engineering. Original papers which provide an important contribution to the development of agricultural engineering and report on significant developments in the field are encouraged.  Aims and Scope  ATA aims to advance the understanding of agricultural engineering by providing a platform for the publication of unique contributions in the field of agricultural engineering across a variety of topics, including, but not limited to:   agricultural and biosystems engineering;  machines and mechanization of agricultural production;  information and electrical technologies;  agro-product and food processing engineering;  physical, chemical and biological changes in the soil caused by tillage and field traffic, soil working machinery and terramechanics;  renewable energy sources and bioenergy;  rural buildings;  agricultural waste management and disposal;  related issues from applied physics and chemistry, ecology, economy and energy.    Rejection Rate   40 %   Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 