Annals of Agrarian Science最新文献

The theory of the analysis of kinematic behaviour of the movement of furrow slice ripped by plough hulls on the example of ripping mouldboard has been developed. Working out the equation of surface of the mouldboard and using the analytical dependencies of the relative and absolute motion trajectories of the blade movement the mathematical models are received describing the patterns of motion of soil particles, at tillage with hulls with mouldboards of ripping type.

The received equations of absolute trajectory of the movement of the furrow slice allows to make the technological assessment of tillage and the equation of relative trajectory establishes the necessary conditions of the movement of furrow slice along the mouldboard with sliding and gives opportunity to reduce largely the traction resistance of plough frame. The practical significance of the developed theory is that given the substantiated function of the change of angle $\gamma \left(z\right)$ and the shape of the directing curve it is possible to create a perfect, from the viewpoint of the least tractive effort, croplands equipment in the design stage.

By the results of theoretical-experimental research is approved that the drag resistance of the groundwork vehicles mainly depends on the state of cultivated environment, properties, structural parameters of working organ and kinematic regime of system [1].

Increasing soil specific resistance results in serious obstacles of the work of the working organ and deterioration of the technological process.

For modeling the interaction between the soil and the working organs have been studied computerized automated design possibilities. Comparison of soil tension and deformation values by SOLIDWORKS software tool allows you to conclude that the 3-fold increase in the angle of the wedge blade to a 24% increase in soil strain and the vertical deformation doubles. Simultaneously, during the design of the working organs, it is possible to obtain functional connections between different parameters, observing the essence of these connections and improving the structure of the working organ.

For many years now, biologists are studying the numbers of harmful species, and regulatory factors in the use of mathematical methods. Now researchers in the majority of the population dynamics of the pest determinant of the two factors - dependent (regulator) and independent (modified), their density in accordance with the denomination. The Independent factors uniformly act on the pests, regardless of their number. This is mainly climatic factors. In contrast, a number of factors, depending on the density (within Amount competition, predators, parasites, diseases) enhance the scope of its activities, with an increase in the number of population. The process is described by differential equations containing nonlinear connections. In particular, we relied on the equations of Volterra-Lotka and Kolmogorov. As is known, it is impossible to find an analytical solution of such an equation and to conduct a qualitative analysis using phase portraits.

The article deals with the research of qualitative and quantitative content of monomeric anthocyanins of the red wine samples obtained from grapes of endemic varieties (Alexandrouli, Mujuretuli, Saperavi, Otskhanuri Sapere, Ojaleshi), spread in different regions of Georgia, and studied by UPLC-MS and HPLC methods. 9 anthocyanins have been identified and quantified. As a result of the analysis, we established: the difference between the varieties according to quantitative contents of the anthocyanins; the directly proportional correlation between quantitative content of wine anthocyanins and antioxidant activity; the reduce of the monomeric anthocyanins number and antioxidant activity after a year of wine aging.

Four disjunction sites with European yew (T. baccata) were included in this study (Fig. 1). All of them are represented in the western part of the Greater Caucasus Range (GCR). Considerable interest was directed towards two sites in the alpine tree line ecotone. Another two sites included low or mid-elevation locations.

The present paper is the first attempt towards data analysis on yew elevation variability across the Greater Caucasus, including treeline ecotone. An effort has been made to reveal survival strategy of yew under pessimal conditions. The sharp geomorphology of high mountainous limestone habitat; harsh climatic conditions long-term impact of severe disturbances due to temperature extremes, solar radiation, cold winds, and other topo climatic conditions; related to both - individual and community stands of yew were considered. All these fluctuating abiotic disorders affect the anatomy, physiology and behavioral peculiarities of relict yew; in particular the vegetative propagation ability of krummholz stand of yew. Our aim here was to strengthen the environmental awareness among the local people through this study, vis-a-vis enlighten the incredible natural sites of the GCR, which contain remarkable endemic and relict flora.

Characteristics of operational reliability of agricultural plows, operating in mountainous conditions were determined on the basis of theoretical and experimental studies Georgia. It is shown that these conditions adversely affect their workability, cause intense wear of working parts of plows, and lead to failures. For this purpose, special coefficient was introduced which takes into account the impact of mountainous conditions on reliability. A structural-logical scheme for reliability calculations was determined and on the basis of theoretical and statistical research single and complex indicators of reliability are determined, adequate probabilistic statistical models are obtained. these models allow to calculate the reliability of plows taking into account mountain working conditions.