№ 136(2), February, 2018
Public date: 28.02.2018
Archive of journal: Articles count 16, 52 kb
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PARAMETERS OF CORN PREPARATION VALVE MILT
05.20.00 Processes and machines of agroengineering systems
DescriptionThe purpose of this study is to determine the basic geometric parameters and the kinematic mode of operation of a roll mill intended for threshing corn cobs at the selection stage. Currently, for the threshing of the corn cobs on seeds at the selection stage, disk threshers of the type MKD-M are used in most cases. These devices practically do not injure the seeds, but it can reach 7-8%. In this case, the cob should be re-threshed, which significantly reduces productivity. One of the promising ways to increase the productivity of threshing corn cobs at the selection stage, while maintaining the minimum level of seed crushing, is the use of roller threshing devices. But there are no commercially available corn roller grinders to date. There are only prototypes. One of the most important requirements for corn threshers is the complete exclusion of seed mixing during the change of the treated cobs. Taking into account that the nomenclature of processed breeding numbers can include hundreds of titles, self-cleaning of working organs is extremely necessary to reduce manual labor costs. We have developed an experimental sample of a roller thresher with two horizontally arranged working elements, which showed a high quality of cob threshing in the course of prospecting studies. In the proposed design of the thresher, the problem of self-cleaning of working organs is absent. To determine the basic parameters of the roll mill, which ensures high quality of the cob threshing, we have conducted a full-factor experiment. The following factors were used as controlled factors: diameter of working elements (rolls) and rotation speed of their rotation. The remaining parameters of the grind were justified on the basis of our previous studies of the operation of corn threshers of various types. The criterion of optimization was the crushing of grain, and the quality of the restriction was used such an indicator as a grain of grain. The material for research was the cobs of the Krasnodar hybrid 425 MV. As a result of the studies, the following optimal parameters of the corn selection thresher were established: roll diameter - 152 mm; rotational speed of rollers - 767 min-1; the minimum clearance between rollers is 6 mm: the height of the protrusion of the working surface of the threshing roll is 10 mm
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OPTIMIZATION OF THE GEOMETRICAL SIZES AND KINEMATIC CHARACTERISTICS OF A SCREW CUTTING DEVICE
05.20.00 Processes and machines of agroengineering systems
DescriptionThe article presents the results of optimization of the angle of inclination and pitch of the cutting segment, the frequency of rotation of the screw when cutting stems of crops of different biometric characteristics of the proposed screw cutting device
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HORMONAL INDUCTION OF THE STAGE OF EXCITATION OF THE SEXUAL CYCLE IN COWS AND HEIFERS
06.02.00 Veterinary and Husbandry
DescriptionThe article gives mechanisms of the influence of the main sex hormones on the sexual cycle of cows and heifers and the effectiveness of their insemination. The effectiveness of gonadotropin preparations releasing hormone, prostaglandin and progesterone, used to induce sexual hunting, was studied. The use of combined use of hormones and prostaglandins is effective for synchronizing sexual hunting, regardless of the stage of the sexual cycle on which healthy animals can be at the time of their administration. The reasons for the retention of the yellow body in the ovary are very diverse. The results of the studies indicate that a particularly close relationship exists between the yellow body and the uterus
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INFLUENCE OF A WAY OF PROCESSING OF THE SOIL ON EFFICIENCY OF SUNFLOWER
DescriptionThis article discusses the results of a study to determine the impact of different primary tillage to sunflower yield. The task of the research was to determine the impact of primary tillage in the agrophysical and agrochemical soil properties. It has been established that the content of productive moisture during the growing period in 0-100 cm soil layer does not depend on the method of processing. Surface treatment of the soil did not have negative effects on soil properties and its agrophysical structure in comparison with moldboard ploughing. . When dump processing improves the density of the soil, accumulates more moisture in the autumn winter period, reduces the weediness of sunflower perennial weeds. Productivity in contaminated areas increases by 3.3 - 5.4 c / ha. On weed-free crops, the yield increased by 2.5 - 3.5 c / ha, due to the improvement of the physical parameters of the soil
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BIOLOGICAL PECULIARITIES OF GROWTH AND DEVELOPMENT OF GOLSHTINSKY YOUTH OF AUSTRALIAN SELECTION
06.02.00 Veterinary and Husbandry
DescriptionThe article presents results of a comparative study of the experimental groups of Holstein animals belonging to the Reflection Sovering line: four groups of repair calves and four groups of bull-calves. The peculiarities of their growth and development were studied at higher daily rates of drinking milk and early training of experimental animals to plant feeds with a probiotic supplement of cellobacterins in the milk period. The technology of growing the animals of the experimental groups had differences: I-control group - up to 6 months of age was grown according to the traditional technology for farming: 200 kg of milk (for 50 days) and 400 kg of return (from 50 to 110 days), concentrated feeds consisted of starter feed (50%) and (50%) maize, the same amount of concentrated feed and the same composition was obtained by calves from experimental groups; II-test group - up to 6 months of age received an increased amount of milk (for 25 days) - 200 kg and 400 kg of return (from 25 to 60 days); animals of the III-rd experimental group - up to 6-month-old age received an increased rate of milk drinking (for 50 days) - 450 kg and return (from 50 to 110 days): heifers - 600, bulls -800kg. Animals of the IV-experimental group-up to 6 months of agereceived an increased rate of milking (for 60 days) - 450 kg and return (from 60 to 120 days): heifers - 600, bulls -800 kg. The calves of all experimental groups were fed a probiotic preparation of cellobacterin in an amount of 3 g for each animal up to 18 months of age. The live weight changed significantly depending on the age and the level of feeding of the experimental animals. The use in the feeding of calves of experimental groups of increased daily average milk yields and the addition of a probiotic to cellobacterin in the diet positively influenced the growth and development of experimental young animals, promoted a more intensive increase in live weight
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AUTOMATED SYSTEM-COGNITIVE ANALYSIS IN AGRONOMY
DescriptionAgronomy systems with good reason can be considered as complex multiparameter natural and technical systems. In these systems, there are numerous and diverse physical, chemical and biological processes. On the one hand, these processes have a significant impact on the performance of these systems. On the other hand, they are extremely difficult to be described in the form of meaningful analytical models based on equations. As a result, the development of meaningful analytical models is associated with a large number of simplifying assumptions that reduce the validity of these models. Usually we consider linear univariate models for agronomic systems, whereas practices are necessary for nonlinear multiparameter models. Thus, we face the problem proposed to be solved by the application of a phenomenological meaningful systemic cognitive models. These models are created using automated system-cognitive analysis (ASC-analysis) using the intellectual system called "Eidos" directly based on empirical data and used for the decision of tasks of forecasting, decision support and research of the modeled subject area. In this case, empirical data can be large, incomplete (fragmented), noisy, presented in different types of measuring scales (nominal, ordinal and numerical) and in different units of measurement. The comparability of the processing of heterogeneous data is ensured by the fact that they are all converted into units of measurement of the amount of information. A numerical example has been given