<abstract xmlns="http://www.w3.org/1999/xhtml">The objective of the paper was to determine the costs of production and production effectiveness of pellets made of sawdust and characteristics of logistics of raw material carriage and distribution of pellets. The scope of the paper covered the research carried out in the branch of DREWEX company located in Chotelek town (Świętokrzyskie voivodeship, Province of Busko Zdrój). Unit costs of pellets production were: 513.4 PLN∙t−1 for option 1, 423.3 PLN∙t−1 for option 2 and 393.3 PLN∙t−1 for option 3. The most favourable was option 3 when the pellets were produced on the technology line in the 3-shift system day and night. The average distance to seven cities from which sawdust was delivered was 43.6 km and the distance to which production was distributed to ten cities was on average 105.5 km.</abstract>

Logistic and Economical Preconditions for Production of Pellets From Sawdust

<abstract xmlns="http://www.w3.org/1999/xhtml">The aim of the work was to determine the influence of screw speed and variable amounts of fresh vegetable additives on selected aspects of extrusion-cooking of corn-vegetable blends. Corn grit as a basic component was supplemented with a fresh pulp of beetroot, carrot, leek and onion in amounts of 2.5-10% in the recipe. The extrusion-cooking was carried out using a single-screw extruder in the temperature range 120-145°C and extrudates were formed into directly expanded snacks. Two indicators were measured: the production efficiency (<italic>Q</italic>) and the specific mechanical energy (<italic>SME</italic>) consumption. As a result of the findings it was noted that the rotational speed of the extruder’s screw showed a greater impact on both production efficiency and <italic>SME</italic> as compared to the variable amounts of applied additives. A tendency to increased efficiency and specific mechanical energy consumption was observed along with the increase of screw speed during processing. The highest production efficiency was observed if fresh leek and onion were used as additives and the highest extrusion speed screw was applied. The largest specific energy consumption was noted during the extrusion-cooking of blends containing fresh carrot and onion addition at high screw speed.</abstract>

Department of Thermal Technology and Food Process Engineering

The Production Efficiency and Specific Energy Consumption During Processing of Corn Extrudates with Fresh Vegetables Addition

<abstract xmlns="http://www.w3.org/1999/xhtml">Development investment capacity of farms depends on their potential and scale of production, and thus its revenue, which determines the scale of investment purchases. Most specialized farms have growth potential. Farmers take great interest in modernization and investing in new technologies, machinery and agricultural land, as confirmed by market analysis. Literature references offer information regarding the needs and investment opportunities of territorially diversified farms running conventional production, however the aim of the work is to determine the investment possibilities of organic farms with various production branches. The research included 50 farms certified as ecological producers. In order to answer the question which type of business has the greatest development potential, the examined facilities were divided into branch groups.</abstract>

Investment Opportunities in Ecological Farms with Various Production Branches

<abstract xmlns="http://www.w3.org/1999/xhtml">This paper presents research on the impact of printing speed on the strength of a manufactured object and is the next stage of the author's research on the impact of technological parameters of 3D printing on the strength of printed models. The tested universal specimens were printed using the FDM (Fused Deposition Modeling) method from PLA (polylactic acid, polylactide). The paper presents the maximum breaking force of the samples and the time of printing samples depending on the printing speed, which varied from 20 mm·s−1 to 100 mm·s−1. The research indicates that the strength of samples decreases with increasing speed. In the range of 50-80 mm·s−1, the strength of the specimens remined at a similar level, however, above 80 mm·s−1, it decreased significantly.</abstract>

Impact of Print Speed on Strength of Samples Printed in FDM Technology

<abstract xmlns="http://www.w3.org/1999/xhtml">The article presents an algorithm for calculating selected energy assessment indexes for grain driers. Particular attention was paid to the conversion of the equations obtained for the operating conditions of the drying process into equations allowing the calculation of indexes for the standard drying conditions. The indexes obtained allow a proper comparison of dryers operating in varied atmospheric conditions, as well as humidity and temperature of the dried material.</abstract>

Department of Machinery Exploitation and Management of Production Processes

Department of Applied Mathematics and Computer Science

Methods for Asssessing Energy Efficiency of Grain Dryers

<abstract xmlns="http://www.w3.org/1999/xhtml">Three different types of nozzles (different wear rate) were used in this study. They are classified depending on the severity of their wear to three groups: new, worn and damaged nozzles. Those nozzles were spraying with the same application rate (303 l/ha) on two-year field trials; this was achieved by changing the spraying pressure for each group of nozzles in order to get the same application rate. This practice is usually done by operators of sprayers, who calibrate the sprayers on the same application rate every year without changing the nozzles, so they tend to reduce the spraying pressure in order to compensate the flow rate increase due to the nozzles yearly wear. Two types of plant growth regulators (PGR) agents were used in this study, namely: Moddus and Kelpak, they were applied to wheat plants field to reduce lodging. The results showed that applying PGR in the year 2015 produced an increase in the wheat yield and reduction in the plant height regardless the nozzle type, although there was not any occurrence of wheat lodging. In the year 2016, the new nozzles produced higher values of wheat yield than other two types of nozzles.</abstract>

Department of Agricultural Machines and Equipment, College of Agricultural Engineering Sciences

Comparing Nozzles with Different Wear Rate and Working with the Same Application Rate of Different Plant Protection Products in Aspect of Plants Condition

<abstract xmlns="http://www.w3.org/1999/xhtml">Assessment of the colour with the use of many parameters is used with reference to evaluation of the quality changes of products resulting from application of specific technological treatments. The paper investigates the effect of relations between parameters of irradiation of potato bulbs with UVC on selected coefficients of assessment of the colour of fries determined with CIE L*a*b* method. It was statistically significantly proved that UV-C radiation affected brightness of fries, change in colour, recognition of the difference in colour and intensity of the colour reception. Statistical analysis of results was carried out at the assumed level of significance α=0.05.</abstract>

Institute of Machinery Management, Ergonomics and Production Processes

Impact of Parameters of Irradiation of Potato Bulbs with UVC on Selected Coefficients of Assessment of Colour of Fries Determined with CIE L*A*B* Method

<abstract xmlns="http://www.w3.org/1999/xhtml">Conclusions on the analysis of the state of development in the tractor industry are formulated, aspects of the forecasting concept of transformation, general layout solutions and the theory of promising tractor units with new propulsion systems are considered, a general approach to the pre-design substantiation of new generation tractors is presented.</abstract>

Belarussian National Technical University

Department of Agricultural, Forest and Transport Machinery

On Changes in Concept and General Composition of Agricultural Tractors

<abstract xmlns="http://www.w3.org/1999/xhtml">The paper analyzes the development opportunities of solar systems in the Republic of Serbia. Renewable energy sources and their energy potential, such as solar energy, should be considered in order to meet the needs of consumers. Solar energy can be considered the most modern renewable energy whose utility is still developing, and it is not represented as the utilization of hydro energy sources. Researches show that Serbia is a country with a high RES potential and that it has favorable conditions for production of electrical and heat energy from renewable sources. The aim of this paper is to present the possibilities of using solar energy in Serbia. Energy supply from renewable energy sources is a key factor for each country's strategy, because it directly contributes to reducing the negative effect on the environment.</abstract>

Analysis of the Development Opportunities of Solar Systems in Serbia

<abstract xmlns="http://www.w3.org/1999/xhtml">The paper presents the coupled electro-mechanical problem. In the numerical analysis of the issue, piezoelectric solid-to-shell transition elements were applied. They combine three-dimensional or hierarchical shell piezoelectric elements with piezoelectric first order elements. The mentioned first order of the element refers to the field of transversal displacements of an element. The mechanical field of the discussed piezoelectric elements may correspond to: the model of three-dimensional theory of elasticity, hierarchical shell models of higher orders or the first order shell model. The electrical field of the potential may be modelled with hierarchical dielectric first order models or higher in transverse direction or with a three-dimensional theory. Effectiveness of modification of algorithms of classical piezoelectric elements was assessed in this paper. To perform such an assessment, curves of convergence of <italic>hp</italic> method in model tasks are presented. Curves obtained with the use of classical and modified piezoelectric transition elements were set and compared.</abstract>

Department of Mechanics and Foundations of Machines Construction

University of Warmia and Mazury in Olsztyn

Institute of Flow Machines of the Polish Academy of Sciences in Gdansk

Effectivity of Piezoelectric Transition Elements in Modelling of Electro-Mechanical Systems

AHEAD OF PRINT

Volume 28 (2024): Issue 1 (January 2024)

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Volume 20 (2016): Issue 1 (April 2016)

Agricultural Engineering

Online ISSN: 2449-5999, Print ISSN: 2083-1587  The following are published in "Agricultural Engineering" Journal:   scientific papers which include original results of the completed theoretical or experimental research the content of which may increase the scientific knowledge in agricultural engineering,  review articles which present the current state and knowledge development trends within the scope of the selected issues concerning agricultural engineering,  scientific news which present selected fragments of research which are carried out and original scientific positions, measuring methods or methods of developing measurement results.   The journal subject covers agricultural engineering, production engineering, food processing engineering, construction and exploitation of machines, renewable energy sources.  Articles regarding are also accepted plant, animal and horticultural production engineering, food and agricultural processing engineering, dehydration and storing, economics and production management, agricultural farms management, construction and exploitation of vehicles as well as agricultural machines and devices, eco-power industry, IT for agricultural engineering.  Rejection Rate:   42%   Why subscribe and read   the articles present the latest trend in agricultural engineering,  over twenty years of experience in publishing original articles dealing with various aspects of the agriculturale engineering,  expert authors from all over the world,  high quality publishing, available in electronic.  Why submit   constructive and fair peer review by international experts in the field,  high quality editing,  articles abstracted by online indexing services and databases,  extensive promotion of each published article to the researchers working in the same field.    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.  Publishing fee   article in English 800 EUR. 