High-Dimensional Radial Symmetry of Copula Functions: Multiplier Bootstrap vs. Randomization

We use a recently proposed fast test of copula radial symmetry based on multiplier bootstrap and obtain an equivalent randomization test. The literature shows the statistical superiority of the randomization approach in the bivariate case. We extend the comparison of statistical performance focusing on the high-dimensional regime in a simulation study. We document radial asymmetry in the joint distribution of the percentage changes of sectorial industrial production indices of the European Union.

Detailing and perfection of calculation of productivity of drawing lines for rebars of A500C and B500C class production based on analysis of procurement contracts

When foreign companies supply equipment for production of class A500 and B500 cold rebars to the Russian market, the manufacturer as a rule estimate its production indices by generally accepted parameters: machine utilization index (MUI), drawing speed and bars diameter (sometimes with specific differentiation). Usually, MUI and drawing speed are presented as the highest reached parameters without accounting particular conditions of operation at a customer, and sometimes – without configuration of the equipment. With a high price of equipment, a customer often gets low efficiency coefficient of correspondence between the high production parameters announced by the manufacturer and those being realized in practice. It was shown that drawing lines for production rebars of the class mentioned above, are typical by equipment content, for example unreeling and power segments. The difference can be only in coiling equipment segment. Such an equipment refers to equipment of cycling products discharge, which is done only at a coil change (a full coil for an empty one). Accumulation of tonnage is provided by a number of coils, which as a result (of a shift, day, month and a year) makes a production program of such drawing lines. If the change of coils at any coiler configuration (automatic, semi-automatic or manual) requires halt of the drawing line, then such halts must be accounted in the time balance of line operation and down times. Accounting of them can considerably change the announced production indices. Per se the production program of such drawing lines should be made taking into consideration actual MUI, but not the advertising one. Results of monitoring of contractual data of some foreign companies presented, to evaluate actuality of the announced by them indices of the equipment production program, supplied at the Russian market. The calculations of down times accounting change time and coils tonnage, as a relative index of drawing lines productivity and their analysis showed that the advertising data presented in the analyzed contracts, cannot be considered as representing and reference ones for making commercial production program of a customer. A method of calculation proposed and recommendations presented, which any customer can use when making inquiry for purchasing drawing equipment from any manufacturer. Also, the method can be used for internal monitoring of in-house production under conditions of particular state of engineer infrastructure and level of automation and mechanization of basic technological operations.

Performance characteristics of sows fed enriched diet from weaning to service in a commercial flock

Fielded data from 40 sows together with obtained data from 1999 to 2005 we analysed to determine the performance of sows fed enriched diet from weaning to a service in a commercialflock. The data were on litter size at birth (LTZVT), litter size at weaning (LTZWN), weaning age (WNAGE) forrowing interval (FRINT), purity (PRTY) and reproductive life (PRODLF). Mean value of 9.44(no), 6.04(no), 31.874, 453.58d and 3.65yrs were obtained for LTZBT, LTZWN, WNAGE, FRINT and PRODLF respectively. The influence of parity on sow's performance was analyzed while mortality and sows efficiency of production were determined. Anagonistic relationship existed between production and reproduction traite. Mortality amongst piglets increased with weaning age. Over 80% of sows hold PRINT of less than 157 days, farrowed litters greater than 7 and 55% weaned litter size of over 8. Parity had no influence on sow's performancw. Sow efficiency of production indices showed that sows had 2 farrowing/year, a farrowing rate of 84% and small litter index of less than 17%. The findings of this study have indicated that better performance of sows can be achieved by giving enriched diet (flushing) from weaning to a service rather than the practice of flushing only few days to service

Organizational and economic aspects of functioning of the field of cattle breeding in Ukraine

The article conducted with a scientific assessment and substantiated organizational and economic aspects of the functioning of the field of cattle breeding. The field of cattle breeding has been traditionally and remains one of the leading ones for Ukraine. The dynamics of livestock, milk production and beef and veal production were analyzed. It was established that the main producers of products of cattle breeding were the economy of the population, which provide more than 70 % of production volumes. The problematic issues of the functioning of the field of cattle were generalized: a reduction in the number of cattle, reducing its productivity, deterioration of production indices and its efficiency, unsatisfactory level of feed base, breeding and tribal work and technological support, insufficient state support, reduction of the level of consumption of products of cattle breeding. It was substantiated that the further functioning of the industry and its efficiency depends on the policy of the government and the motivational mechanism. The important areas for increasing the efficiency of the field of cattle are the concentration of production, including on the basis of co-operation of manufacturers, improvement of feed base and tribal affairs, modernization of logistical support, investment and innovation activity was argued