Efficiency of growing and fattening of hybrid pigs of English origin under dry and combined systems of their feeding

The article aimed to study the efficiency of rearing and fattening pigs with constant drying throughout life and variable during fattening feeding systems. It was established that changing the feeding system from dry to liquid led to an acceleration of the intensity of the piglets and, as a result, a 7.8 % increase in their weight at the end of fattening did not worsen feed conversion in pigs, but on the contrary, led to its improvement by 2.9 % on fattening and by 1.8 % during the period of rearing and fattening. Feed consumption per head and kilogram of growth during the rearing period did not differ significantly between groups of animals, which, accordingly, did not differ in cost. Meanwhile, during fattening, pigs that were switched to liquid feeding consumed 6.8 % more feed, resulting in 6.8 % more feed per head during the fattening period and a correspondingly higher cost. However, due to the higher intensity of growth, feed conversion in them turned out to be 2.9 % better, contributing to a 2.9 % reduction in the feed cost for 1 kg of growth compared to animals that consumed dry feed at this stage. No difference was found in the efficiency of rearing piglets under constant feeding during the weaning period and the growing period, while during the fattening period, the operational cost of fattening one head was found to be higher by 6.8 %, by 5.0 % the cost price and by 7.8 % of its cost completion of fattening, 8.8% income from fattening one animal and 1.9 % better profitability of this process in a group of animals with a variable feeding system. At the same time, due to better growth indicators, the animals of this group showed a 1.0 % lower cost of 1 kg of gain during fattening and a 2.6 % lower cost of 1 kg of live weight at its completion. It is also established that the cost of 1 kg of growth for growing and fattening is lower by 2.3 %. The cost of one head is higher by 5.0 %, its market value by 7.8 %, income from sales by 13.2 %, and by 7.8 % profitability of the entire production cycle of obtaining, growing, and fattening pigs. Changing the feeding system from dry to liquid after the growing-out period increased the efficiency of the whole process of acquiring, growing, and fattening pigs

Scattering properties of carbon nanotube antennas

The boundary problem of diffraction and excitation of system of nanotubes-vibrators was reduced to solution of the integral equation (IE) with logarithmic kernel. After regularization the IEs were solved by means of collocation method considering th current’s behaviour at the vibrator's endings. The existence of resonances in the frequency range 0.1-1.0 THz was shown

Electrodynamic analysis of nanoscale antennas of millimeter and optical bands

Electrodynamic models and radiophysical properties of carbon nanotubes – vibrators (isolated on the substrate lattices), metallic optical antennas and optical antennas, formed from ZnO nanorods coated with metal films were developed and investigated. The models are based on numerically-analytical solution of integro-differential equations describing the diffraction of electromagnetic waves on impedance and dielectric bodies. Using the integral representations of the kernels of integro-differential equations allowed to overcome the difficulties of solution, associated with the singularity of kernels and to reduce the computation time for an order

Synthesis, Electrical and Magnetic Properties of Composites Copper Iodide/Magnetite-Polychlorotrifluoroethylene

The structural, magnetic and electrophysical properties of composites based on nanosized magnetite chemically modified of copper iodide and polychlortrifluoroethylene have been studied at temperatures 298 – 450 K and CuI concentrations of from 0 to 0,58 volume. It has been found the optimal volume content of copper iodide ( 0,4) in the composites CuI/Fe3O4, when the interfacial interaction shows most intensively and maximum values electrical parameters take place. The value of the coercive force of nanocomposites CuI/Fe3O4 increases with increasing content copper iodide. It was shown that polymer composites containing CuI/Fe3O4, have higher values of real and imaginary components of complex permittivity and conductivity compared with a system that contains only copper iodide. Keywords: magnetite, copper iodide, nanocomposites, specific magnetization, interfacial interaction.</span

The Properties of Synthesized Graphene and Polychlorotrifluoroethylene – Graphene systems

The properties of composites based on polychlorotryfluoroene with graphene containing 5 % (wt.) obtained by electrochemical dispergasion of graphite electrodes were researched. It is shown that the conductivity of the initial graphene that is determined by the impedance spectroscopy method is caused by the mainly electronic component. The concentration dependence of conductivity at low frequencies and real and imaginary components of the complex dielectric permeability at a frequency of 9 GHz composites significantly changes in the concentration range of 0,25-1%, that is stimulated by the presence of percolation threshold with graphene content of 0,45 %. The critical indexes of the percolation theory were calculated for the system.Keyword: graphene, complex dielectric permeability, composites, conductivity.</p