Time filter

Source Type

Cujbescu D.,INMA Bucharest | Voicu G.,Polytechnic University of Bucharest | Bolintineanu G.,INMA Bucharest | Persu C.,INMA Bucharest | And 3 more authors.
INMATEH - Agricultural Engineering

Romania's strategic objective of EU integration imposes, among others, policies that ensure the implementation of community requirements on the free movement of products, which is based on an open market economy, based on competition and economic and social cohesion. Agricultural productivity (main economic branch through its impact on the society and environment) is influenced by technological level of applied work, sowing work occupying a very important place in these technologies. This paper presents a method for testing the hoeing plants sowing machines with the help of a stand equipped with laser sensors that measure the time interval between the fall of two seeds which it transforms in space and which it compares to the reference area calculated by a specialized software after entering the input data (density, distance between rows, number of holes on the disk, speed). Source

Moise V.,Polytechnic University of Bucharest | St S.B.,Polytechnic University of Bucharest | Kabas O.,Bati Akdeniz Agricultural Research Institute | Ungureanu N.,Polytechnic University of Bucharest | And 4 more authors.
INMATEH - Agricultural Engineering

To establish a machinery system and the optimal mechanization technologies for different types of agricultural farm and for various specific conditions it is necessary to use scientific methods of optimization. The success of a business, including agriculture, is determined by the amount of profit, which depends on the quality and quantity of the achived product. To determine the minimum surfaces from which a certain power range of tractors becomes profitable, the income limit must be equal to the costs required to perform works in that area. In this paper is determined the optimal surfaces matrix for 20-65 HP tractors, used in family farms. For the determination of the minimum surfaces, incomes and necessary costs for the considered works must be taken into account. The optimal usage time of the tractors, the matrices of aggregates yields, as well as the matrix of equipment costs are also determined. Various methods of numerical optimization are used. After running numerical calculus and optimization programs, has been observed that, in case of family farms, the minimum surfaces from which a certain power range of tractors becomes profitable decreases if the work is performed by the farmer, with personal equipment. It has also been observed that the minimum surface required for the profit to be equal to zero at the limit, decreases with higher quality of the equipment. Source

Corneanu G.C.,Vasile Goldis Western University of Arad | Corneanu M.,USAMVB Timisoara | Craciun C.,Babes - Bolyai University | Zagnat M.,UMF Gr.T. Popa | And 2 more authors.
Environmental Engineering and Management Journal

In the experiments performed in mouse (Mus musculus) the radioprotective effect of Deuterium Depleted Water (DDW, with 30 ppm deuterium) and a 0.01% total extract of polyphenols (from Aralia mandshurica cortex) ), applied individually or together was tested, towards a sublethal dose of X-rays (5.28 Gy). The animals were intraperitoneal injected (five injections with 0.5 mL each, one at two days), with single DDW, or with a 0.01% polyphenols diluted in DDW. The stress factor was applied one day after the third injection. As radiobiological point the ultrastructural features of the liver was used (following the animal sacrifice a day after the last injection). The X-irradiation of the animals treated independently or combined with DDW and polyphenols extract, manifest a radioprotective effect, especially in the combined action of the two factors. Also, it was established that the application of a single exogenous factors, enhanced the lipid drops from hepatocyte. Source

Boja N.,Vasile Goldis Western University of Arad | Boja F.,Vasile Goldis Western University of Arad | Caba I.,USAMVB Timisoara | Darau P.A.,Vasile Goldis Western University of Arad
INMATEH - Agricultural Engineering

The present research displays the results obtained after the digging of holes for planting saplings in a previously unprepared soil, following the steps to carry them out according to some physical-mechanical properties of the soil. The research was carried out on a horizontal ground in the O.S. Iuliu Moldovan, in two arranged unities (parcels) 31 C and 32 A, in a previously unprepared ground, on two types of soil: gley-soil (the muddy subtype) and alluvial soil (the vertical-gleyed subtype), and in O.S. Radna, u.a. 74, on a brown typically luvic soil, using the Stihl BT 121 motto-borer with a 150 mm drill. The objectives of the research were to make a comparative determination, on different types of soil, of the qualitative parameters, among which the most important ones are: degree of loosening of the soil taken and left in the hole, resistance to penetration, resistance to shearing, timing of drilling holes, degree of scattering of the soil taken out from the hole, degree of evacuation of the soil from the hole, gas consumption for the drilling of the hole, using the Stihl BT 121 motto-borer in order to establish its technical efficiency. In order to observe the influence which the drilling of holes have on walls, we measured the resistance to penetration and resistance to shearing every 10 cm at a 30cm depth, the proper depth for planting small-sized saplings, on two opposite sides, so that we could get the most probable values of these physicalmechanical properties of the soil. After taking the measures in order to establish the compaction degree of the wall and of the bottom of the hole by the borer in that interval, it was judged that in conditions of normal humidity, if the borers have sharp knives and are well conceived and executed in technical terms speaking, there are no big values of the resistance to penetration which could affect the subsequent development of the saplings. Source

Biris S.,Polytechnic University of Bucharest | Savin L.,University of Novi Sad | Ungureanu N.,Polytechnic University of Bucharest | Maican E.,Polytechnic University of Bucharest | And 3 more authors.
INMATEH - Agricultural Engineering

This paper presents an analytical model using finite elements method, allowing the study of the interaction between agricultural tractor tyres and the rolling track, the distribution of stresses and strains in different types of rolling tracks (agricultural land, agricultural exploitation land and public land), and in tyres, for various inflation pressure values. A 3D model of the real tyre has been achieved, for which were defined the parameters characterising the elastic behaviour of rubber tyre. Results and conclusions obtained from this study are useful in the identification of optimal operating parameters for tyres driving wheels of agricultural vehicles. Source

Discover hidden collaborations