GEOMETRICAL MODELING FOR TRAINING SPECIALISTS IN INSTITUTE OF ENGINES AND ENERGY INSTALLATIONS: PRELIMINARY RESULT

The paper presents a summary of content and experience of teaching disciplines, which requires skills of geometric modeling of designing objects, and these skills form the professional competence of a modern aircraft engines specialist

РАСЧЕТ РЕЗОНАНСНЫХ ЧАСТОТ КОЛЕБАНИЙ РАБОЧИХ КОЛЕС ВРД С ИСПОЛЬЗОВАНИЕМ ВОЛНОВЫХ КОНЕЧНЫХ ЭЛЕМЕНТОВ

 The highly efficient algorithm for finding the resonance frequencies of rotating blade disks from gas turbine engines was developed. The algorithm based on use of interpolation function at the frequency domain for stresses and material properties. The algorithm don't use resonance diagram to find resonance frequencies of blade disks. The developed algorithm is implemented as a computer programming language Fortran. The resonance frequencies of model blade disk were explored.  Для исследований резонансных частот вращения рабочих колес турбомашин с примене­нием волновых конечных элементов разработан высокоэффективный алгоритм, не требую­щий построения резонансной диаграммы колеса. Алгоритм основан на введении интерпо­лирующих функций в частотной области для механических характеристик материалов и статических напряжений от действия поля центробежных сил и неравномерного нагрева, в сечениях конструкции. Разработанный алгоритм реализован в виде вычислительной про­граммы на языке программирования Фортран. Проведены сравнительные расчетные иссле­дования резонансных частот колебаний рабочего колеса

Structure relaxation in thin filamentary germanium crystals

In filamentary germanium crystals previously strained by torsion, the shape and structure return associated with reverse motion of screw dislocations towards the sources thereof have been revealed under action of thermal field and elastic one generated only by a constant uniaxial tensile loading. A change in mechanisms controlling the dislocation mobility and the plastic straining in the microcrystal has been found.В предварительно пластически деформированных кручением одного знака нитевидных кристаллах германия при воздействии термического и упругого, порожденного только постоянной одноосной нагрузкой растяжения, полей обнаруживаются возврат формы и структуры, связанные с реверсивным движением винтовых дислокаций к своим источникам. Обнаружена смена механизмов, контролирующих подвижность дислокаций и пластическую деформацию в микрокристалле.У ниткоподі6них кристалах германію, попередньо пластично деформованих крутінням одного знаку, під впливом термічного та пружного, породженого тільки постійним одновісним навантаженням розтягу, полів виявлено повернення форми та структури, пов’язане з реверсивним рухом гвинтових дислокацій до своїх джерел. Виявлено зміну механізмів, що контролюють рухомість дислокацій та пластичну деформацію у мікро-кристалі

Electroplastic effect associated with the dislocation generation in the initially dislocation-free silicon filamentary crystals

Experiments on local high-intensity electric current pulse action on mechanical properties of a Si filamentary crystal made it possible to reveal a novel type of electroplastic effect associated with the generation of dislocations.Эксперименты по локальному высокоинтенсивному воздействию импульсом электрического тока на механические свойства нитевидных кристаллов Si позволили обнаружить новую разновидность электропластического эффекта, связанного с зарождением дислокаций.Експерименти з локального високоінтєнсивного впливу імпульсом електричного струму на механічні властивості ниткоподібного кристалу кремнію дозволили виявити новий різновид електропластичного ефекту, пов’язаного з зародженням дислокацій

GC/MS analysis of aqueous ethanol solutions of drugs. Part 1. Menthol and p-aminobenzoic acid derivatives

Ajoint GC/MS analysis of aqueous and aqueous-ethanol solutions of some drugs including menthol, validol, benzocaine, novocaine, and menovazin has been performed using a Varian 3900/2100T (USA) instrument equipped with a Varian Factor Four VF-5ms capillary column. The structures of some impurities that were previously based on theoretical considerations are confirmed. Structural-analytical possibilities of the latest modification of the Varian GC/MS system with an ion-trap source are investigated. It is possible to obtain clear mass spectra even for low-intensity and partly overlapping chromatographic peaks using the given device combination. The results can be used for quality control of drugs based on the investigated compounds. © 2009 Springer Science+Business Media, Inc

GC/MS analysis of aqueous ethanol solutions of drugs. Part 1. Menthol and p-aminobenzoic acid derivatives

Ajoint GC/MS analysis of aqueous and aqueous-ethanol solutions of some drugs including menthol, validol, benzocaine, novocaine, and menovazin has been performed using a Varian 3900/2100T (USA) instrument equipped with a Varian Factor Four VF-5ms capillary column. The structures of some impurities that were previously based on theoretical considerations are confirmed. Structural-analytical possibilities of the latest modification of the Varian GC/MS system with an ion-trap source are investigated. It is possible to obtain clear mass spectra even for low-intensity and partly overlapping chromatographic peaks using the given device combination. The results can be used for quality control of drugs based on the investigated compounds. © 2009 Springer Science+Business Media, Inc

Innovative competency management tool

The article deals with the problem of creating innovative competency management tool concerning high-tech industries. The application of such tool and mechanisms provides an opportunity to ensure the active implementation of intellectual property in the economic and commercial turnover, as well as to form a proactive response in the operational and strategic management of the intellectual property of the organization to the market challenges faced by the enterprise. Creating the innovative competency management tool aims at maintaining the competitiveness of the organization, its products and services, as well as providing conditions for effective development, use, implementation, and attraction of organization's innovative competencies. The practical outcome of the article consists of a developed innovative competency management tool provided with a description of the step-by-step technique, the elements of which can be automated in the form of a software package. © 2019. revistaESPACIOS. com

Estimation of the efficiency of the dry method of decontamination of surface contamination of alpha-emitting-radionuclides

The article describes the evaluation of the efficiency of using the technology of dry method of decontamination of α-radionuclides from working surfaces of premises for different materials, equipment and building structures. Materials and methods. Instruments for measuring of ambient dose equivalent rate (ADER) with a lower limit of 0.03 μSv/h. Specific activity of α-radionuclides in the samples was determined by radiometric, radiochemical and spectrometric methods using standard methods in the accredited laboratory. The measurements in situ were also carried out using the ISOCS «CANBERRA» mobile gamma-ray spectrometry system with high purity germanium detector and a collimator. Technological equipment included industrial vacuum cleaner with nozzles; high-pressure device; packing sets for RAW collection; HEPA filters; personal protective equipment. Results. Maps of spatial distribution of surface α-contamination in the building was constructed. We performed cluster analysis of data for zoning of contaminated surfaces. The decontamination factor for porous (brick, concrete), smooth (wood, brown tiles, laminate) and sticky (bitumen, mastic) surfaces was determined. Conclusion. The cluster analysis made it possible to identify 4 levels of surface α- and β- contamination, particles/cm2 · min: zone I - for α- above 50, for β- above 10,000; zone II - for α- 5-50, for β- 2,000-10,000; zone III - for α- no more than 5, for β- 2000; zone IV - corresponds to the background values of the workspace surfaces. The dry decontamination method revealed a high content of fine dust aerosol fraction deposited in the lungs. To increase the efficiency of dust suppression, water aerosol with droplet size of 100 - 400 microns and quartz sand with particle size of 100-200 microns were sprayed at the rate of 200-400 g per 1 m2. The decontamination coefficient depends on the coating material and the level of surface contamination: concrete - 91 to 97.8%; brick - 85-86%, wood - 38.8-53%; brownstone tiles - up to 29%; mastic - 22-28%; bitumen - 15.9-20%. To protect the personnel, radiation-hygienic rationing of PM10 and PM2,5 content is necessary. © 2019 Izdatel'stvo Meditsina. All rights reserved