Subjects -> AGRICULTURE (Total: 981 journals)
    - AGRICULTURAL ECONOMICS (93 journals)
    - AGRICULTURE (680 journals)
    - CROP PRODUCTION AND SOIL (120 journals)
    - DAIRYING AND DAIRY PRODUCTS (30 journals)
    - POULTRY AND LIVESTOCK (58 journals)

AGRICULTURE (680 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 263 Journals sorted alphabetically
aBIOTECH : An International Journal on Plant Biotechnology and Agricultural Sciences     Hybrid Journal   (Followers: 2)
Aceh International Journal of Science and Technology     Open Access   (Followers: 6)
Acta agriculturae Slovenica     Open Access   (Followers: 2)
Acta Agrobotanica     Open Access   (Followers: 3)
Acta Agronomica Hungarica     Full-text available via subscription   (Followers: 3)
Acta Agronomica Sinica     Full-text available via subscription   (Followers: 4)
Acta Aquatica Turcica     Open Access   (Followers: 1)
Acta Biologica Sibirica     Open Access   (Followers: 1)
Acta Fytotechnica et Zootechnica     Open Access   (Followers: 2)
Acta Scientiarum Polonorum Technica Agraria     Open Access   (Followers: 1)
Acta Scientiarum. Animal Sciences     Open Access   (Followers: 5)
Acta Scientifica Malaysia     Open Access   (Followers: 1)
Acta Technologica Agriculturae     Open Access   (Followers: 1)
Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis     Open Access   (Followers: 2)
Acta Universitatis Sapientiae, Alimentaria     Open Access   (Followers: 2)
Advanced Research in Life Sciences     Open Access   (Followers: 2)
Advances in Agriculture     Open Access   (Followers: 14)
Advances in Agriculture & Botanics     Open Access   (Followers: 5)
Advances in Agronomy     Full-text available via subscription   (Followers: 20)
Advances in Horticultural Science     Open Access   (Followers: 4)
Advances in Life Science and Technology     Open Access   (Followers: 10)
Africa Research Bulletin: Political, Social and Cultural Series     Hybrid Journal   (Followers: 22)
African Journal of Food, Agriculture, Nutrition and Development     Open Access   (Followers: 15)
African Journal of Range & Forage Science     Hybrid Journal   (Followers: 12)
Agra Europe     Full-text available via subscription   (Followers: 3)
Agribusiness : an International Journal     Hybrid Journal   (Followers: 6)
Agric     Open Access   (Followers: 1)
Agricultura     Open Access   (Followers: 3)
Agricultura Tecnica     Open Access   (Followers: 2)
Agricultura Tropica et Subtropica     Open Access   (Followers: 2)
Agricultura, Sociedad y Desarrollo     Open Access   (Followers: 2)
Agricultural & Environmental Letters     Open Access   (Followers: 4)
Agricultural and Food Science     Open Access   (Followers: 14)
Agricultural Commodities     Full-text available via subscription   (Followers: 1)
Agricultural Economics     Open Access   (Followers: 6)
Agricultural Economics : The Journal of the International Association of Agricultural Economists     Hybrid Journal   (Followers: 60)
Agricultural History Review     Full-text available via subscription   (Followers: 14)
Agricultural Research     Hybrid Journal   (Followers: 9)
Agricultural Science     Full-text available via subscription   (Followers: 1)
Agricultural Sciences     Open Access   (Followers: 5)
Agricultural Systems     Hybrid Journal   (Followers: 35)
Agricultural Water Management     Hybrid Journal   (Followers: 50)
Agriculture     Open Access   (Followers: 2)
Agriculture     Open Access   (Followers: 6)
Agriculture & Food Security     Open Access   (Followers: 19)
Agriculture and Food Sciences Research     Open Access   (Followers: 9)
Agriculture and Human Values     Open Access   (Followers: 25)
Agriculture, Ecosystems & Environment     Hybrid Journal   (Followers: 63)
AGRIEAST : Journal of Agricultural Sciences     Open Access   (Followers: 2)
AgriEngineering     Open Access  
Agrinova (Agrotechnology Innovation)     Open Access   (Followers: 1)
Agriprobe     Open Access   (Followers: 1)
Agriscience     Open Access   (Followers: 1)
Agrisost     Open Access   (Followers: 1)
Agritech     Open Access   (Followers: 1)
AGRITROPICA : Journal of Agricultural Sciences     Open Access   (Followers: 1)
Agrivet : Jurnal Ilmu-Ilmu Pertanian dan Peternakan / Journal of Agricultural Sciences and Veteriner)     Open Access   (Followers: 4)
Agrivita : Journal of Agricultural Science     Open Access  
Agro Sur     Open Access  
Agro-Science     Full-text available via subscription   (Followers: 2)
Agroalimentaria     Open Access  
Agrociencia     Open Access  
Agrociencia Uruguay     Open Access  
Agroecological journal     Open Access  
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Agronomía & Ambiente     Open Access  
Agronomía Costarricense     Open Access  
Agronomía Mesoamericana     Open Access  
Agronomía Tropical     Open Access  
Agronomie Africaine     Full-text available via subscription  
Agronomy     Open Access   (Followers: 12)
Agronomy Science     Open Access  
Agrosains : Jurnal Penelitian Agronomi     Open Access  
Agrosearch     Open Access  
Agrosintesa Jurnal Ilmu Budidaya Pertanian     Open Access  
Agrosystems, Geosciences & Environment     Open Access   (Followers: 4)
Agrotechnology Research Journal     Open Access  
Agrotekma : Jurnal Agroteknologi dan Ilmu Pertanian     Open Access  
Agrotrop : Journal on Agriculture Science     Open Access   (Followers: 1)
AL-Qadisiya Journal For Agriculture Sciences     Open Access  
American Journal of Agricultural and Biological Sciences     Open Access   (Followers: 6)
American Journal of Botany     Full-text available via subscription   (Followers: 17)
American Journal of Economics and Sociology     Hybrid Journal   (Followers: 36)
American Journal of Potato Research     Hybrid Journal   (Followers: 2)
American Journal of Rural Development     Open Access   (Followers: 5)
Analytical Science Advances     Open Access   (Followers: 1)
Animal - Open Space     Open Access   (Followers: 2)
Animal Diseases     Open Access  
Animal Microbiome     Open Access   (Followers: 1)
Annales des Sciences Agronomiques     Full-text available via subscription  
Annals of Agricultural Sciences     Open Access   (Followers: 1)
Annals of Arid Zone     Open Access   (Followers: 1)
Annals of Silvicultural Research     Open Access  
Annual Review of Resource Economics     Full-text available via subscription   (Followers: 11)
Applied Financial Economics Letters     Hybrid Journal   (Followers: 8)
Aquacultura Indonesiana     Open Access  
Arboricultural Journal : The International Journal of Urban Forestry     Hybrid Journal   (Followers: 6)
Archiva Zootehnica     Open Access  
Archives of Current Research International     Open Access  
Archivos de Zootecnia     Open Access   (Followers: 1)
ARO. The Scientific Journal of Koya University     Open Access  
Arthropod-Plant Interactions     Hybrid Journal   (Followers: 2)
Artificial Intelligence in Agriculture     Open Access   (Followers: 1)
Asia-Pacific Journal of Rural Development     Hybrid Journal   (Followers: 2)
Asian Economic Papers     Hybrid Journal   (Followers: 8)
Asian Food Science Journal     Open Access   (Followers: 1)
Asian Journal of Advances in Agricultural Research     Open Access  
Asian Journal of Agricultural and Horticultural Research     Open Access  
Asian Journal of Agricultural Extension, Economics & Sociology     Open Access   (Followers: 1)
Asian Journal of Agricultural Research     Open Access   (Followers: 6)
Asian Journal of Agriculture     Open Access  
Asian Journal of Medical and Biological Research     Open Access   (Followers: 3)
Asian Journal of Plant Sciences     Open Access   (Followers: 2)
Asian Journal of Research in Agriculture and Forestry     Open Access   (Followers: 1)
Asian Plant Research Journal     Open Access  
Asian Research Journal of Agriculture     Open Access   (Followers: 1)
Atatürk Üniversitesi Ziraat Fakültesi Dergisi     Open Access  
Australian Cottongrower, The     Full-text available via subscription  
Australian Economic Papers     Hybrid Journal   (Followers: 10)
Australian Economic Review     Hybrid Journal   (Followers: 4)
Australian Forest Grower     Full-text available via subscription   (Followers: 2)
Australian Forestry     Hybrid Journal   (Followers: 1)
Australian Grain     Full-text available via subscription  
Australian Holstein Journal     Full-text available via subscription   (Followers: 1)
Australian Journal of Agricultural and Resource Economics     Hybrid Journal   (Followers: 4)
Australian Journal of Agricultural Engineering     Open Access   (Followers: 1)
Australian Sugarcane     Full-text available via subscription  
Avances en Investigacion Agropecuaria     Open Access   (Followers: 1)
Bangladesh Agronomy Journal     Open Access  
Bangladesh Journal of Agricultural Research     Open Access   (Followers: 1)
Bangladesh Journal of Scientific Research     Open Access  
Berichte aus dem Julius Kühn-Institut     Open Access  
Berkala Ilmiah Pertanian     Open Access   (Followers: 1)
BHUMI : Jurnal Agraria dan Pertanahan     Open Access  
Bioagro     Open Access  
Biocatalysis and Agricultural Biotechnology     Hybrid Journal   (Followers: 3)
Biochar     Hybrid Journal   (Followers: 1)
Biocontrol Science and Technology     Hybrid Journal   (Followers: 5)
Biodiversity     Hybrid Journal   (Followers: 25)
Biodiversity : Research and Conservation     Open Access   (Followers: 28)
BIOFIX Scientific Journal     Open Access  
Biological Agriculture & Horticulture : An International Journal for Sustainable Production Systems     Partially Free   (Followers: 10)
Biosystems Engineering     Hybrid Journal   (Followers: 8)
Biotecnología en el Sector Agropecuario y Agroindustrial     Open Access  
Boletín Semillas Ambientales     Open Access  
Botanica Orientalis : Journal of Plant Science     Open Access  
British Poultry Science     Hybrid Journal   (Followers: 6)
Buletin Peternakan : Bulletin of Animal Science     Open Access   (Followers: 1)
Buletin Veteriner Udayana     Open Access   (Followers: 1)
Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca : Food Science and Technology     Open Access   (Followers: 1)
CABI Agriculture and Bioscience     Open Access   (Followers: 1)
Caderno de Ciências Agrárias     Open Access  
Cahiers Agricultures     Open Access  
California Agriculture     Open Access   (Followers: 1)
Cambridge Journal of Economics     Hybrid Journal   (Followers: 77)
Canadian Water Resources Journal     Hybrid Journal   (Followers: 18)
Capitalism Nature Socialism     Hybrid Journal   (Followers: 21)
Caraka Tani : Journal of Sustainable Agriculture     Open Access  
Ceiba     Open Access  
Central European Forestry Journal     Open Access   (Followers: 1)
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
CESifo Economic Studies     Hybrid Journal   (Followers: 23)
Ceylon Journal of Science     Open Access  
Chemical and Biological Technologies for Agriculture     Open Access   (Followers: 1)
Chilean Journal of Agricultural & Animal Sciences     Open Access  
Chilean Journal of Agricultural Research     Open Access   (Followers: 1)
Ciencia e Investigación Agraria     Open Access  
Ciência e Técnica Vitivinícola     Open Access  
Ciencia forestal en México     Open Access   (Followers: 1)
Ciencia, Tecnología y Salud     Open Access  
Científic@ : Multidisciplinary Journal     Open Access  
COCOS : The Journal of the Coconut Research Institute of Sri Lanka     Open Access   (Followers: 1)
Coffee Science     Open Access  
Cogent Food & Agriculture     Open Access  
Competition & Change     Hybrid Journal   (Followers: 12)
Compost Science & Utilization     Hybrid Journal  
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 7)
Corpoica Ciencia y Tecnología Agropecuaria     Open Access  
CSA News     Hybrid Journal   (Followers: 1)
Cuadernos de Desarrollo Rural     Open Access  
Cultivos Tropicales     Open Access  
Cultura Agronômica : Revista de Ciências Agronômicas     Open Access  
Cultural Geographies     Hybrid Journal   (Followers: 20)
Cultural Sociology     Hybrid Journal   (Followers: 34)
Cultural Studies - Critical Methodologies     Hybrid Journal   (Followers: 17)
Cultural Studies of Science Education     Hybrid Journal   (Followers: 10)
Cultural Trends     Hybrid Journal   (Followers: 13)
Culture, Agriculture, Food and Environment     Hybrid Journal   (Followers: 21)
Culture, Agriculture, Food and Environment     Hybrid Journal   (Followers: 8)
Current Agricultural Science and Technology     Open Access  
Current Agriculture Research Journal     Open Access  
Current Applied Science and Technology     Open Access  
Current Protocols in Plant Biology     Hybrid Journal   (Followers: 2)
Current Research in Dairy Sciences     Open Access   (Followers: 3)
Diatom Research     Hybrid Journal   (Followers: 3)
Dinamika Pertanian     Open Access  
Dissertationen aus dem Julius Kühn-Institut     Open Access  
Dossiers Agraris     Open Access  
E-Jurnal Agroekoteknologi Tropika (Journal of Tropical Agroecotechnology)     Open Access  
Ecological Applications     Full-text available via subscription   (Followers: 135)

        1 2 3 4 | Last

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Acta Technologica Agriculturae
Journal Prestige (SJR): 0.247
Citation Impact (citeScore): 1
Number of Followers: 1  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1335-2555 - ISSN (Online) 1338-5267
Published by Sciendo Homepage  [370 journals]
  • Characteristics of Distance Errors of Infrared Sensor Relation to Colour
           Surfaces

    • Abstract: This paper deals with the determination of the absolute errors of a small time of flight (ToF) distance sensor with respect to coloured surfaces at different illumination intensities. The aim was to determine the absolute error of the measured distance by the VL53L1X sensor when set to short-mode and long-mode at different illumination intensities: 10 lx and 350 lx depending on the coloured surface using regression analysis methods. The research was performed using 7 colour samples with different spectral colours determined according to the CIE Lab colour model. Based on the performed experiments, it was found that the error at different sensor settings, change of colour surface and different illumination intensity is approximated by a linear function only up to a certain measured distance. The process is influenced by proposed factors such as: illumination intensity, coloured surface with different illumination reflectance and signal-noise parameters of the tested sensor during the experiment.
      PubDate: Thu, 03 Mar 2022 00:00:00 GMT
       
  • Abrasion Resistance of Restorative Coatings for Crankshafts and Bearings
           in Agricultural Machinery

    • Abstract: The paper presented examines the dynamics of wear of restored parts using different materials for the friction pair. The pair of crankshaft and sliding bearing largely determines the machine service life – although their overall wear index is less than 1%, it can still lead to a large number of failures and malfunctions. Vibrating arc overlaying in a shield of gas mixture of 60% argon and 40% carbon dioxide was used for restoring the surface of rollers. Subsequently, these were treated by heating with high-frequency current (HFC) and lowered to a hardness of 55±2 HRC and ground to the final size. It was found that the antifriction coating of plain bearings with electrochemical lead alloy ЕО92 showed excellent performance and insignificant wear in combination with reference material St45 and welded coating DUR500. In combination with electrochemical lead alloy ЕО92, the welded coating DUR500 showed a significantly higher wear on actuation compared to the reference material St45 at sliding friction. The relative wear resistance enhancement of crankshafts and bearings by restorative coatings represents an essential measure, as their service life can be prolonged by 20–50% in contrast to the new parts without restorative coatings.
      PubDate: Thu, 03 Mar 2022 00:00:00 GMT
       
  • Use of Dynamic Time Warping for Description of Combustion Process in a
           Biomass Boiler

    • Abstract: The efficient biomass energy use is a key prerequisite for the implementation of renewable energy development strategies on a regional level. For the highly efficient energy use in the combustion process, it is necessary to properly regulate the process based on its precise description. The paper aim is to evaluate whether dynamic time warping (DTW) methods can be used for this description, as well as for the recognition of the specific operating state of a biomass boiler. For the DTW analysis, operating records of more than 10 hours of a laboratory biomass boiler (P = 25 kW) were used, including an emission analysis, for which the operating modes were intentionally alternated in order to identify the stable and transient states of boiler operation. Based on the results, it can be stated that the identical partial operating sections of the controlled variables can be reliably identified in the operating variables of boiler by means of the DTW method, since its manifestations of operating regulation showed compliance with the given operating state, and it is possible to identify a partial quantity for estimating the total operating boiler state.
      PubDate: Thu, 03 Mar 2022 00:00:00 GMT
       
  • Optimized Mathematical Model of a Grain Cleaning System Functioning in a
           Combine Harvester using Response Surface Methodology

    • Abstract: The performance of grain combine harvesters is determined by three factors: threshing power, losses and fuel consumption. Loss can be reduced by separating processes and providing a suitable mathematical model for each of them by examining and measuring the factors influencing loss and optimizing their function. This model is then to be used for the purposes of controlling the system. An important process that has a significant impact on combine loss is the cleaning system. This study modelled and optimized the function of a cleaning system using response surface methodology (RSM). Feed rate, fan speed, and upper sieve opening were considered independent variables; the percentage of grain passage, content of materials-other-than-grains (MOG), and semi threshed cluster (s.t.c.) passing through the upper sieve were viewed as dependent variables. The results showed a significant effect of all three independent variables on the percentage of free grains with a probability level of 0.01. However, not all interactions were significant. Moreover, it was found that only mechanical factors had a significant effect on the percentage of s.t.c. passing, while fan speed and all interactions showed no significant effect. All three independent variables significantly affected the MOG content passing. An appropriate exponential model was found for all three dependent variables. Subsequently, the optimal conditions were determined for the maximum passage of free grains through the upper sieve and the minimum MOG at 3.33 kg·s−1 feed rate, 742 rpm fan speed, and an upper sieve with 10 mm openings with a desirability of 0.84, based on RSM modelling.
      PubDate: Thu, 03 Mar 2022 00:00:00 GMT
       
  • Design and Assessment of a Small-Scale Machine for Cleaning Wheat Grains

    • Abstract: A small-scale wheat cleaning machine was designed to winnow and separate grains from materials-other-than-grains (MOG), such as premature grains and chaff, in order to enhance the quality of grains. It was evaluated technically with respect to assessment criteria: cleanliness, grain loss, chaff rejection, and cleaning efficiency. Experiments were carried out at three levels of sieve slopes (5, 10, and 15°), two sieve reciprocating speeds (0.48 and 0.95 m·s−1), two levels of feed rates (1 and 1.5 kg·min−1), and three air velocities (5, 6 and 7 m·s−1). The results showed that, at sieve reciprocating speed of 0.95 m·s−1, the maximum cleanliness value was – 96.25% – observed at 1.5 kg·min−1 feed rate, 5 m·s−1 air velocity and 5° sieve slope. The minimum cleanliness value – 76.82% – was observed at a feed rate of 1 kg·min−1, 15° sieve slope, 7 m·s−1 air velocity, and 0.48 m·s−1 sieve reciprocating speed. The results showed that the use of either a very low, or a very high sieve slope angle and sieve reciprocating speed while using different air velocities and feed rates is not recommended.
      PubDate: Thu, 03 Mar 2022 00:00:00 GMT
       
  • Influence of Biodiesel on Performance of Machine-Tractor Units

    • Abstract: Currently, liquid biofuels, and especially biodiesel, are increasingly used. In terms of agricultural production, there arises an urgent question whether utilization of biofuels in agricultural tractors is feasible and efficient. Majority of results regarding the biodiesel use comes from bench tests of engines. However, work of any machine-tractor unit under real conditions, except for the steady-state mode of movement, includes acceleration mode after a turn, or after it was forced stop in the field. It has been established that the addition of sunflower methyl ester (SME) into conventional diesel (CD) leads to a decrease in the throttle response of a tractor engine during its field operation. Using 50% CD and 50% SME as fuel mixture, the tillage machine-tractor unit’s acceleration time increased by 16.6%. Operating on SME only, the unit’s acceleration time reached 50%. The acceleration process of a machine-tractor unit using fuel with addition of SME is non-linear. It consists of two parts: more intensive − with SME content in diesel fuel of up to 50%, and less intensive − with an increase in SME proportion over 50%. When using a mixture of CD with SME in a ratio of 50 : 50, the soil cultivation machine-tractor unit performance decreased by 7.2%, and fuel consumption per tilled area increased by 5.3%.
      PubDate: Thu, 03 Mar 2022 00:00:00 GMT
       
  • Near Infrared Spectroscopy: Rapid and Simultaneous Approach to Predict the
           Fixed Carbon, Volatile Matter and Ash Contents in Biochar Produced from
           Agricultural Residues

    • Abstract: Presented paper aimed to employ the near infrared spectroscopy (NIRS) as a rapid and simultaneous method for quality assessment of biochar samples made of agricultural waste materials (chatter bamboo; firewood; coconut shell). Spectral data were obtained in the wavelength range of 1000–2500 nm, while actual fixed carbon, volatile matter and ash contents were observed using standard chemical analysis. Moreover, prediction models were established using two different regression approaches: principal component regression and partial least square regression. Prediction performances were evaluated by assessment of several statistical indicators, such as correlation coefficient and ratio of prediction to deviation index. The results showed that PLS generated a better prediction performance with maximum r coefficient and RPD index – 0.89 and 2.26 for fixed carbon; 0.93 and 2.84 for volatile matter; 0.90 and 2.30 for ash content. Based on the results acquired, it can be concluded that NIRS is usable for the purposes of a rapid and simultaneous approach to biochar quality determination.
      PubDate: Thu, 03 Mar 2022 00:00:00 GMT
       
  • The Use of University Biosystem Environmental Protection Platform to
           Prevent a New Outbreak of the COVID-19 Pandemic

    • Abstract: The purpose of this study was to determine the possibility of practical use of the Hackathon Platform for ecological protection of the university biosystem to prevent a new outbreak of the COVID-19 pandemic. The COVID-19 pandemic significantly affects companies and population’s behaviour. The most significant change occurred in the attitude of companies to the environment from technical and technological points of view. To increase their production sustainability, these companies are looking at the possibilities of waste recovery through sustainable recycling, or recovery of waste as a source of secondary raw material. One of the simplest ways is to use agricultural waste for energy purposes, bringing bioenergy to the forefront as a new area of Industry 4.0. The ALARA model was used to assess the quality of six biosystem components (atmospheric air, water resources, soil layer, the level of land pollution with chemicals and littering by the unauthorized dumps; sufficient volume of green planting on the territory). This allowed the development of management decisions and environmental protection measures based on the system of calculated indicators of potential environmental damage for each of six biosystem components. The forecast of plan implementation: the quality of four from among six biosystem components (atmospheric air, water resources, soil layer, sufficient volume of green planting on the territory) will increase on average by 30–40%. A minor improvement in the quality of the other biosystem components (approx. by 10%) raises concerns about the high probability of a new outbreak of the COVID-19 pandemic.
      PubDate: Thu, 03 Mar 2022 00:00:00 GMT
       
  • Biodiesel Production from Waste Frying Oils by Potassium Methoxide
           Supported on Activated Carbon Catalysts from Lignocellulosic Biomass

    • Abstract: Various carbon-rich solid catalysts are evaluated for the synthesis of biodiesel from waste frying oil. The study results showed that the use of activated carbon made of corn stalk could increase the biodiesel yield by 7%. The heterogeneous carbon-based catalysts made of lignocellulosic residues could successfully improve the quality of biodiesel properties. The results obtained revealed that the biodiesel properties, including relative density (852–900 kg·m−3) and kinematic viscosity (2.4–3.9 mm2·s−1), are in compliance with the standard limits of ASTM and the European Biodiesel Standard, suggesting that the biodiesel produced would be decent as a diesel fuel that potentially can minimize the serious damage of engine parts, and prolong the engine life.
      PubDate: Tue, 07 Dec 2021 00:00:00 GMT
       
  • Mechanical Properties of Wheat Grains at Compression

    • Abstract: Hook’s law for evaluation of the modulus of elasticity of wheat grains and its general behaviour under compressive loads were studied. Whole specimens were subjected to compressive loading between metal parallel plates. The mechanical properties of grains were determined in terms of average failure strengths of grain bran and whole grain; deformation; and modulus of elasticity. The mechanical properties of very dry grains of the winter wheat Triticum aestivum L. with the moisture content of 10.3% were studied. The failure strength of grain bran was 4.43 MPa at the deformation of 10.7%, and the failure strength of whole grains was 4.88 MPa at the deformation of 13.5%. The modulus of elasticity of grains was 43.67 MPa. The apparent energy density at bran failure strength was 0.261 MJ·m−3, and 0.470 MJ·m−3 on the level of grain failure strength of the whole grain. The bran border structure of central inner part of grains was studied using microscope digital sections of longitudinal cuts of the grains using the image computer processing method. The area proportion of starch and pericarp of the border parts of grains was studied to describe the border texture of central sections of grains.
      PubDate: Tue, 07 Dec 2021 00:00:00 GMT
       
  • Spruce and Barley Elemental and Stochiometric Analysis Affected by the
           Impact of Pellet Production and Torrefaction

    • Abstract: Biomass is a potential biofuel which may help fighting high carbon dioxide emissions and negative impacts of global warming. Analysis of Norway spruce (Picea abies) and barley (Hordeum vulgare) were performed at the laboratory of Czech University of Life Sciences. Material was torrefied in an inert nitrogen atmosphere at the temperatures of 250 °C and 280 °C for 45 minutes. Elementary and stoichiometric parameters were monitored and impact of torrefaction and pellet production on carbon footprint was determined. Torrefied and pelleted material showed better fuel properties in comparison to the original material. Calorific value of the torrefied spruce wood chip increased by 12.27% when torrefied at the temperature of 250 °C, and by 25.41% when torrefied at the temperature of 280 °C.
      PubDate: Tue, 07 Dec 2021 00:00:00 GMT
       
  • Assessment of the Possibility of Reducing the Thermal Load in the Barn by
           using Mechanical Ventilation

    • Abstract: The aim of this work is to evaluate possibility of reducing the heat stress of milking cows via climatic indices and the influence of air flow velocity in the object with milking cows using the cross-section method. For the purposes of evaluation, there was selected a four-row housing facility for 160 milking cows with natural ventilation; for the summer period, natural ventilation was supplemented with mechanical ventilation (2877 m3·h−1 per cow). Measurements were conducted in the network created with 12 measuring points across the barn width, repeated in five cross-sections A, B, C, D and E, followed by further measurements in the longitudinal direction performed always in a row of 22 points placed in resting zones along the air flow direction. Considering the state of potentially high heat load with THI >78, it was observed that, according to ETIC, without employing the fans, ETIC in AOZ was higher than nAOZ, ETICAOZ = 25.34 ±0.42 vs ETICnOAZ = 24.51 ±0.44 (p <0.05). After activation of fans above lying area, ETIC in AOZ was lower than nAOZ, ETICAOZ = 23.40 ±0.61 vs ETICnAOZ = 23.68 ±0.60, which was not validated in evaluation of THI. Even though the limiting value of very high heat stress ETIC = 25 was not exceeded after activation of fans, decreasing of heat stress in rest zones did not reach recommended value ETIC = 20. A more significant improvement was validated in ETIC evaluation with measurements in longitudinal direction in the lying area – there was confirmed dominant influence of air flow speed. Heat load decreasing was influenced by speed and distribution of air in AOZ, both overall and local air exchanges in AOZ with ACHv >100 h−1, and barn length.
      PubDate: Tue, 07 Dec 2021 00:00:00 GMT
       
  • The Effect of Crop Residue Percentages and Their Chopped Size on Soil
           Compactibility

    • Abstract: The advancement of technology and increasing use of mechanization in agriculture, as well as increasing size of agricultural machinery for farm capacity improvement, have led to soil compaction. In developed countries, various reports of the soil compaction impacts on the reduction of agricultural products have been provided. In developing countries, soil compaction represents a less-known issue and a its destructive nature in agriculture has not been sufficiently addressed. Furthermore, in developed countries, the soil is rich in organic matter due to conservation tillage; however, in Iran, conservation tillage is not possible to perform because of traditional agriculture and using old agricultural machinery. Therefore, plant residues are either removed from fields, or burned. However, sufficient content of organic matter in field can contribute to soil compaction mitigation. The aim of this study was to investigate the effect of percentage of crop residues and their size on soil compaction at different soil moisture contents. For these purposes, five different soil moisture contents (8, 10, 12, 14 and 16% based on dry soil weight) and 4 residue rates at 3 fragmentation sizes were observed in terms of soil compaction. At all different soil moisture contents and residue sizes, with increasing percentage of added straw to the soil, the soil displacement increased. Moreover, as the straw size increased, the initial displacement during compression decreased, e.g., the maximum displacements for straw percentage of 12% and soil moisture of 8% were 64, 62 and 60 mm considering the straw sizes of 1, 2.5 and 5 cm, respectively. With high residue percentage, the final soil density and soil compaction were lower due to the low specific density of straw relative to soil. Furthermore, with high percentage of straw, more deformations and displacements were occurred in the mixture due to large deformation of straws. The density changes of soil-straw mixture were more significant at high residue percentages.
      PubDate: Tue, 07 Dec 2021 00:00:00 GMT
       
  • The Control Reversing Algorithm for Autonomous Vehicles with
           PSD-Controlled Trailers

    • Abstract: Driving a vehicle with a passive trailer has been the subject of numerous studies. Current control strategies are mostly used by differential geometry, linear algebra, fuzzy regulators, and artificial neural networks. The objective of this study is to design an algorithm for autonomous control of the tractor-trailer system reversing based on an algorithm using a PSD controller and to verify it on a simulated mathematical model. All parameters listed in the models and experiments are performed based on the existing tractor-trailer system. Dynamic models of steering and velocity control were identified and incorporated into the simulation. Result includes a stable operation of the steering without oscillating. The proposed algorithm can be implemented in microcontrollers without the need for high computing power.
      PubDate: Tue, 07 Dec 2021 00:00:00 GMT
       
  • Comparison of Control Algorithms by Simulating Power Consumption of
           Differential Drive Mobile Robot Motion Control in Vineyard Row

    • Abstract: The paper deals with comparing electricity power consumption of various control algorithms by simulating differential mobile robot motion control in a vineyard row. In field of autonomous mobile robotics, the quality of control is a crucial aspect. Besides the precision of control, the energy consumption for motion is becoming an increasingly demanding characteristic of a controller due to the increasing costs of fossil fuels and electricity. A simulation model of a differential drive mobile robot motion in a vineyard row was created, including robot dynamics for evaluating motion consumption, and there were implemented commonly used PID, Fuzzy, and LQ control algorithms, the task of which was to navigate the robot through the centre of vineyard row section by measuring distances from trellises on both robot sides. The comparison was carried out using Matlab software and the best results in terms of both power consumption and control accuracy were achieved by LQI controller. The designed model for navigating the robot through the vineyard row centre and optimized controllers were implemented in a real robot and tested under real conditions.
      PubDate: Tue, 07 Dec 2021 00:00:00 GMT
       
  • Performance Evaluation of Solar Air Collector by Chimney Effect for Drying
           Applications

    • Abstract: Solar air collector is one of the main components of a solar dryer unit, which supplies the conditioned air for processing the perishable edible items. Various techniques have been employed to improve the thermal efficiency of the collector system, such as extended surfaces, packed beds, artificial roughness, etc., however, the cost of construction is higher. Therefore, this study was focussed on the collector efficiency enhancement using a chimney without applying the aforementioned. A single-pass solar air collector coupled with drying chamber and chimney was utilized for the experiments. The experiments were conducted in September. The average values of the solar radiation intensity, ambient temperature, temperatures inside the dryer, collector efficiency were graphically presented. The experimental data reported the maximum values of the outlet temperatures for the solar air collector with and without a chimney to be 52.8 °C and 57 °C, respectively. The collector thermal efficiency with and without the chimney was found to vary from 29.6% to 64.8% and from 26.9% to 44.8%, respectively. Furthermore, it was noticed that, with the chimney, the temperature inside the dryer showed uniform tendency.
      PubDate: Tue, 07 Dec 2021 00:00:00 GMT
       
  • Mathematical Modelling of the Fruit-Stone Culture Seeds Calibration
           Process Using Flat Sieves

    • Abstract: The paper provided describes a mathematical model of calibration process of fruit-stone culture seeds of cherry, sweet cherry, cherry-plum, apricot and almond using flat sieves with impact shock ball cleaners oscillating in the horizontal plane. It has been defined that the mathematical expectation of time of knocking out the fruit-stone from the sieve opening T⌢\mathord{\buildrel{\lower3pt\hbox{$\scriptscriptstyle\frown$}}\over T} is the minimum value of ratio of average time of complete ball motion cycle in space under sieve to the probability of knocking out the stone by a ball with the kinetic energy level of 2 Mj. The dependences of energy distribution density of ball on impact on the sieve have been obtained, based on which the intervals of ball cleaner parameters have been determined, i.e. the ball diameter D belongs to the interval 25–35 mm; the space height H under sorting sieve belongs to the interval 1.2D–1.4D mm; the value range for distance between rods t belongs to the interval 0.5D–0.7D mm. Using the method of golden section, the following parameters of ball cleaner were obtained: D = 33 mm, t = 23 mm, H = 40 mm. The parameters obtained provide mathematical expectation of time of knocking out the fruit-stone from the sieve opening T⌢\mathord{\buildrel{\lower3pt\hbox{$\scriptscriptstyle\frown$}}\over T} = 0.03 s. Consequently, the average ball velocity v⌢\mathord{\buildrel{\lower3pt\hbox{$\scriptscriptstyle\frown$}}\over v} is = 0.4 m∙s-1, and the average ball path is L⌢\mathord{\buildrel{\lower3pt\hbox{$\scriptscriptstyle\frown$}}\over L} = 0.006 m.
      PubDate: Tue, 10 Aug 2021 00:00:00 GMT
       
  • Duplex Anti-Corrosion Protection of Steel Using a Combination of Hot-Dip
           Galvanising and Water-Soluble Paints

    • Abstract: The goal of this paper is an evaluation of research aimed at corrosion and mechanical resistance of the so-called duplex system applied to a steel sheet. This system consists of a metal coating applied by hot-dip galvanising, to which an acrylic, water-soluble paint is commonly applied (commonly available on the Czech market) using standard technology in an air stream. For the purposes of the corrosion resistance comparison, one set of test specimens is provided only with a hot-dip galvanised coating. The mechanical resistance of applied anti-corrosion protection was determined by means of a pull-off adhesion test (according to the ČSN EN ISO 4624 standard), as well as an indentation test (according to the ČSN EN ISO 1520 standard). The corrosion resistance tests were then conducted in a salt spray environment (according to the ČSN EN ISO 9227 standard) for the samples not damaged by mechanical tests. Based on the obtained results, in general, waterborne paints with high dry matter content, low specific gravity and high zinc phosphate content, which are applied in several thinner layers, can be recommended.
      PubDate: Tue, 10 Aug 2021 00:00:00 GMT
       
  • Dynamic Modelling and Motion Control of a 4-DOF SCARA Robotic Arm for
           Various Farm Applications

    • Abstract: Agriculture as a key industry for human food suply will face various concerns in near future. This research is complementary and aims to present the dynamic modelling and simulation, as well as algorithm development of a 4-DOF SCARA-type robotic arm designed for real agricultural cultivation process, such as seeding, watering, fertilizing, weeding, etc. In terms of a previously designed system, the equations of motion profile were solved (acceleration and deceleration control of joints) to reduce inertia, ensure a smooth motion, and minimize torque requirement. The algorithm is evaluated by PTP motion, TCP linear motion, and spline motion. The results show that the developed algorithm can move the TCP using ST-profile. Furthermore, it can control all joints for an estimated time duration. A novel method was developed to manoeuvre the TCP along the shortest path to reach a goal point. Finally, the algorithm was evaluated in a closed path inside the working space.
      PubDate: Tue, 10 Aug 2021 00:00:00 GMT
       
  • Development and Research of New Media Jet Aeration Scheme in a Loop
           Bioreactor Producing Microbiological Products

    • Abstract: Jet aeration loop reactors are widely used in the chemical industry due to their high mixing intensity, possibility of significant saturation of medium with gases, and simplicity of scaling the processes when passing from laboratory equipment to industrial designs. However, to ensure the necessary amount of air in standard jet aeration schemes with ejectors, high pressure of the medium (up to 6 bars) is required in the reactor loop. This paper presents a newly developed scheme of jet aeration, based on mixing the pressure flows of medium and air supplied to the ejector by individual blowers. Experiment results of the new water aeration scheme showed that, for the formation of suspended matter in the ejector with an air content of 2–20 l per 1 l of water, a pressure of 0.3 bar in the reactor loop at an air pressure of 1 bar is sufficient. This allows usage of low-pressure pump and compressor, which form the basis for the energy consumption reduction and creates prerequisites for lowering the shear loads on a crop. The medium aeration rate during experiments was 0.220–0.266 vvm. It was found that, for each mode of joint operation of pump and compressor, it is possible to maintain a constant aeration rate, which is not significantly affected by the flowrate regulation of medium in loop.
      PubDate: Tue, 10 Aug 2021 00:00:00 GMT
       
 
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