№ 131(7), September, 2017
Public date: 29.09.2017
Archive of journal: Articles count 124, 307 kb
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SOURCES OF ELECTRICAL ENERGY OF AIRCRAFT ELECTRIC POWER SUPPLY SYSTEMS: CONDITION AND PERSPECTIVES
DescriptionAccording to its operating principles, generators of aircraft electric power supply systems do not differ from the similar generators of transporting and stationary systems, but have range of peculiarities: low weight and dimensions, high density of armature current, compulsory cooling (air and liquid), high frequency of rotor spinning. The article considers main requirements, imposed to generators of flight vehicle and the construction peculiarities and main physical and operational characteristics of generators applied in modern flight vehicles. It is suggested to use noncontact electrical machines as sources of electrical energy in the aircraft electric power supply systems: synchronous generators with impulses from permanent magnets and asynchronous generators with capacitive impulse. To improve physical and operational characteristics of generators and aircraft electric power supply systems it is suggested to refuse from permanent frequency spinning drivers which have low converters as stabilizer of voltage and frequency current of electrical energy source. The peculiarities of its operation are considered, its advantages and disadvantages. It is possible to improve characteristics of aircraft electric power supply systems by means of study of the electromagnetic compatibility of the main functional system elements and by means of application of non-contact electrical devices, applied in the guard and control systems, made on the basis of power and electronic devices
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FEATURES OF MODELING OF TECHNOLOGICAL OPERATIONS OF AGRICULTURAL RAW MATERIALS PROCESSING
DescriptionThe ways of improving the work of food enterprises during processing of agricultural raw materials on the basis of a system analysis of the durations of technological operations are considered. The basic mathematical models of technological processes have been analyzed and the possibility of using unified technological operations to predict the time of completion of work has been shown for processing various pairs of raw materials. It is established that the construction of mathematical models of technological processes of processing of agricultural raw materials should be based on using the potential of transfer of the target component between isopotential surfaces. This allows not only to unify the created models of technological processes, but also to significantly increase their extrapolating ability to estimate the durations of technological operations
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Description
An overview of various ways of preparing roses for industrial processing with the aim of obtaining rose essential oil is presented. Based on the patent and information retrieval data, features of new, scientific developments in this field, which have not yet found wide application in industrial processing, their advantages and disadvantages are discussed. The conclusion is made about the need to search for new, modern, environmentally safe ways of preparing raw essential oil for industrial processing
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Description
To reduce the development of additional settlement strip foundations of the existing building on the effect of pressure transmitted to a ground base located near the new slab foundation is considered the work of the geotechnical barrier in various ground conditions. In the first variant of soil, conditions (variant 1) made geotechnical barrier structure in a homogeneous thickness of the weak clay soil. In the second variant of soil conditions (variant 2), a separating barrier is performed in a two-layer base. The upper base layer (carrying) is shown a weak water-saturated clay soil, and the second (underlying) - low compressible soil (sandy loam plastic). According to the results of the calculations and modeling found that, the greatest positive effect on the separating barrier structure (geotechnical barrier) is achieved in the case when the base is a two-layer. The lower part of the geotechnical barrier must be recessed into the soil of low compressibility. Additional settlement strip foundation of the existing building in a uniform basis (variant 1) in the absence of geotechnical barrier is approximately 8 cm. In the case of a two-layer base (variant 2), the additional settlement strip foundation building is reduced by 80-85% (6.6 cm) and will make about 1.4 cm
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Description
The power plant being investigated is Novocherkassk State District Power Plant located in the settlement of Donskoy, Rostov region. The power object is included in the list of objects of the fuel and energy complex subject to categorization and is defined as critically important. The analyzed site is the "subsidiary farm", which includes a chemical reagent warehouse and a site for chemical water purification, where hazardous substances are treated: sulfuric acid and technical sodium hydroxide. The analysis of the main causes of accidents at thermal power stations occurred during processing, storage and transportation of hazardous substances, and typical scenarios of possible accidents at the chemical water treatment plant of thermal power plants were considered
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06.00.00 Agricultural sciences
COMPARATIVE CHARACTERISTICS OF TECHNOLOGICAL PARAMETERS OF DELICACIES FROM MEAT OF IMPORTED PIGS
06.00.00 Agricultural sciences
DescriptionIn recent years, many pigs of specialized breeds, characterized by increased meat qualities, have been brought to Russia from Canada and a number of European countries. The article presents the results of the assessment of slaughter and meat qualities of pigs of different genotypes. Danish pig meat was used as research objects: purebred landrace (CHL), benthic hybrid Landrasx yorkshire (LxY), three-breed hybrid landrace hyorkshire x dyurok (LxXxD), removed from control fattening, and developed prototypes of delicacy products. The commission evaluation of meat and broth showed that the boiled meat from the three breed animals received the highest score, and the quality of the broth significantly exceeded the samples of purebred landrace and two-breed animals. As a result of the tasting evaluation of the Voronezh ham, it was established that the samples of meat from threebreeded pigs, in comparison with the samples from purebred meat, show the most pronounced flavor, aroma and soft consistency
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ROLE OF ALIMENTARY FIBERS IN TREATMENT AND PREVENTION OF THE OBESITY
06.00.00 Agricultural sciences
DescriptionExcess body weight is a serious problem, involving a set of diseases presently. For this reason, taking into account demands of science there was a development of production of food with the lowered energy value for the people having first of all obesity that led to production of substitutes. Even more often producers resort to use of nutritional supplements, which generally receive in synthetic way. In this article, we analyzed multiple references and summarized the material regarding beet fibers. As a result of numerous researches it has been proved that food fibers make favorable impact both on the separate systems of a human body, and on all organism. The use of the minor products of processing of the plant raw material is also critical; they allow improving the preventive properties of products and enriching them with dietary fibers, protein, and mineral elements and also development of food development of curative and preventive action. Citri-Fi food fibers which are received from dried-up orange pulp are well-known, they can keep a large amount of water throughout technological process. They exert positive impact on structure of fat that gives the chance to create a product with the lowered content of fat
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SOME ASPECTS OF INTRODUCING IN VITRO OF NEW CLONAL ROOTSTOCKS FOR STONE FRUIT CROPS
06.00.00 Agricultural sciences
DescriptionThe article presents the results of the study of the effect of the size of the explant clonal rootstocks for stone fruit crops of the Krymskaya OSS VIR VSL-1, VSL-2, LC-52, RVL-1, RVL-7, VVA-1, AP-1 injected in vitro and concentration vitamins and phytohormones in a nutrient medium on the efficiency of introducing in vitro of these rootstocks. The optimal size of the injected in vitro explant was determined and nutrient medium in the first stage of micropropagation was optimized. The optimal size of the dissected meristem, which provides the maximum percentage of explant initiation is 0.4 mm. The modified version of the nutrient medium based on the Murashige and Skug prescriptions with a reduced content of vitamins B1 0.1 mg / l, B6 0.4 mg / l, PP- 0.4 mg / l, and phytohormone 6-BAP - 0.3 mg / l. at the first stage of cultivation of explants of clonal rootstocks for stone fruit crops is optimal. The survival rate of explants in all tested samples of clonal rootstocks on this modified nutrient medium was in the range of 92.5-97.5%
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06.00.00 Agricultural sciences
DescriptionIn peach orchards of the Russian humid subtropics, leaf curl is the most dangerous and harmful disease. Due to the high degree of danger from the peach leaf curl, for the first time in this region the main task was to analyze peach leaf curl development on weather conditions. In order to solve the problem, it is proposed to apply a new innovative intellectual technology: automated system-cognitive analysis (ASK-analysis) and its software tools - the “Eidos” system. In order to build the model, based on our own observations and the experience of Russian and foreign colleagues, it was decided to use the following factors: the sum of temperatures above +4 ° C of the current year (for the period from January to April), the sum of temperatures above +4 ° C of the previous year (for the whole year), the sum of precipitation of the current year (for the period from January to April), the sum of precipitation of the previous year (for the whole year), the number of hours of infection (in the current year). It was established that such factors as the number of hours of infection, the sum of temperatures above +4 ° C in April and during the period from January to April, as well as the sum of precipitation in March and April, are the most important in the dynamics of peach leaf curl development and spread. High rates of leaf curl spread and development are caused by the number of hours of infection in the range of 1440 ... 2064 hours, as well as by low air temperatures in March and April (the sum of temperatures above +4 °C – 89,4-240,4° and 283,7-316,7°, respectively) and high air temperatures - in January and February (the sum of temperatures above +4 ° C – 155,3-259,6° and 243,5-280,1°, respectively)
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RESULTS OF FEIJOA HYBRIDIZATION IN THE HUMID SUBTROPICS OF KRASNODAR REGION
06.00.00 Agricultural sciences
DescriptionFeijoa crop is valuable due to the complex of useful traits (high frost resistance, big yield, ornamental value and long profitable period). These fruits have delicate flavor, nutritional and dietary properties. The fruits are juicy with a pleasant, gentle, refreshing sweet and sour taste, specific strawberry-pineapple flavor and contain significant quantities of important substances for the human body. Pectin (up to 2.5%), sugars (6-14%), proteins, vitamins, organic acids, mineral salts, etc. are among them. However, the challenge of its cultivation is the lack of cultivars and plantations are represented by a mixture of hybrids originated from free pollination, and characterized by a great variety in biological and morphological traits, differing not only in yield, but in size, shape and yield period. In this connection, the breeders faced the objective to create new cultivars of feijoa, using classical and modern breeding methods and available genetic resources for commercial gardening and production. Development of the core hybrid diversity material and selection of promising forms are the most important stages of the breeding process, providing success of further breeding programs. The breeding of varieties and forms for crossings was carried out according to the principle of combining the desirable traits of the obtained offspring. There are direct and reverse crosses in six combinations ('Dachnaya' x 'Superba', 'September' x 'Superba', 'Dagomysskaya' x 'Superba', 'Superba' x 'Dachnaya', 'Superba' x 'September', Superba ; X 'Dachnaya'). The viability of the pollen was evaluated prior to pollination, by germination on a nutrient medium - 1% agar-agar + 15% sucrose. The degree of fertility varied year by year: in 2015 - 60-62%, and in 2016 - 68-77-88%. The best crossing combinations were established 'September' x 'Superba' and the 'Superba' x 'Dagomyskaya for the creation of the hybrid genepool of Feijoa sellowiana. A high percentage of germination of the feijoa seeds was noted in combinations of 'Dagomyskaya' x 'Superba' (74%) and 'Superba' x 'Dagomysskaya' (70%).