Multi-Parameter Methodology for Assessing Quality Indicators of Nanomodified Fiber-Reinforced Concrete for Construction Site

Nanomodified fiber-reinforced concrete is a building material for which the required characteristics of fracture toughness are a distinctive feature. Determination of the stress intensity factor of fiber-reinforced concrete makes it possible to correctly assess the resistance of the material during the formation and development of cracks. The proposed multi-parameter methodology for assessing the quality indicators of nanomodified fiber-reinforced concrete makes it possible to evaluate the quality of a fiber-reinforced concrete structure in construction and laboratory conditions. To carry out control at the construction site, modern and long-used methods of non-destructive testing are used: ultrasonic sounding, ultrasonic tomography, elastic rebound, separation with chipping. For laboratory studies, the technique provides for the manufacture of prism samples that can be molded or cut from the body of the structure. This methodology makes it possible to obtain in laboratory conditions such material parameters as tensile strength in bending, tensile strength in splitting, critical stress intensity factor for normal separation, critical stress intensity factor for transverse shear, energy consumption for individual stages of deformation and destruction of the sample, as well as to evaluate the uniformity of distribution fibers. Moreover, it is provided to obtain all the parameters on one sample from the series, which eliminates errors and inaccuracies in the quality indicators of the material associated with different conditions of hardening, molding, inaccuracies in duplicating the composition

Многопараметрическая методика оценки показателей качества наномодифицированного фибробетона для строительной площадки

Nanomodified fiber-reinforced concrete is a building material for which the required characteristics of fracture toughness are a distinctive feature. Determination of the stress intensity factor of fiber-reinforced concrete makes it possible to correctly assess the resistance of the material during the formation and development of cracks. The proposed multi-parameter methodology for assessing the quality indicators of nanomodified fiber-reinforced concrete makes it possible to evaluate the quality of a fiber-reinforced concrete structure in construction and laboratory conditions. To carry out control at the construction site, modern and long-used methods of non-destructive testing are used: ultrasonic sounding, ultrasonic tomography, elastic rebound, separation with chipping. For laboratory studies, the technique provides for the manufacture of prism samples that can be molded or cut from the body of the structure. This methodology makes it possible to obtain in laboratory conditions such material parameters as tensile strength in bending, tensile strength in splitting, critical stress intensity factor for normal separation, critical stress intensity factor for transverse shear, energy consumption for individual stages of deformation and destruction of the sample, as well as to evaluate the uniformity of distribution fibers. Moreover, it is provided to obtain all the parameters on one sample from the series, which eliminates errors and inaccuracies in the quality indicators of the material associated with different conditions of hardening, molding, inaccuracies in duplicating the composition.Наномодифицированный фибробетон – это строительный материал, отличительной особенностью которого являются требуемые характеристики трещиностойкости. Определение коэффициента интенсивности напряжений фибробетона дает возможность правильно оценить сопротивление материала при образовании и развитии трещин. Предлагаемая многопараметрическая методика оценки показателей качества наномодифицированного фибробетона позволяет оценить качество фибробетонной конструкции в строительных и лабораторных условиях. Для осуществления контроля на строительной площадке используют современные и давно применяемые методы неразрушающего контроля: ультразвуковое зондирование, ультразвуковую томографию, упругий отскок, отрыв со скалыванием. Для лабораторных исследований методика предусматривает изготовление призматических образцов, которые могут быть отлиты в форму или вырезаны из тела конструкции. Эта методика позволяет получить в лабораторных условиях такие параметры материала, как прочность на изгиб, прочность при растяжении на раскалывание, коэффициент интенсивности напряжений при нормальном отрыве, коэффициент интенсивности напряжений при поперечном сдвиге, энергозатраты на отдельные стадии деформации и разрушения образца, а также оценить равномерность распределения волокон. Более того, предусмотрено получение всех параметров на одном образце из серии, что исключает ошибки и неточности в показателях качества материала, связанные с различными условиями твердения, формования, погрешностями при дублировании состава

Effect of the anisotropy of monocrystalline silicon mechanical properties on the dynamic characteristics of a micromechanical gyroscope

The aim of the research was to determine the effect of temperature on mechanical properties of a micromechanical gyroscope with the sensing element mounted on a silicon wafer, with the crystallographic orientation of (100) (110) (111). The research is of current relevancy since the metrological characteristics that depend on the eigenfrequencies over the full temperature range are to be controlled. The temperature-modal analysis of the micromechanical gyroscope model was performed with ANSYS program. The temperature dependence for eigenfrequencies was obtained. The dependence of the scale factor on temperature for the most temperature-independent variant of sensor positioning on the wafer was determined. The developed mathematical model was used to find the forms of the output oscillations of the gyroscope

Experience of international training at the dental faculty of UGMU

In 2018, for the first time at the Ural State Medical University dental department, the IADS (International Association of Dental Students) international student exchange program began, during which students are invited to an internship at the dental faculty and the dental clinic of the USMU for 2-4 weeks. During the cycle the guests got acquainted with the structure of the university, visited the bases of the dental clinic of the Ural Medical State University, dental clinics of the graduates of the USMA. At the end of the cycle, the guests noted the high saturation of the course with practical exercises, the availability of visual material and the equipment of classes with equipment and tools. Carrying out an international internship for foreign students is one of the steps to forming a multilingual environ at the university, whose goal is to enter the international educational and scientific spaceВ 2018 году впервые на стоматологическом факультете УГМУ начался проект – программа международного студенческого обмена в рамках IADS (IADS – International Association Dental Students), в  ходе которой иностранные студенты приглашались на стажировку на  стоматологический факультет и в стоматологическую поликлинику УГМУ на 2-4 недели. В ходе цикла гости познакомились со структурой ВУЗа, посетили базы стоматологической поликлиники УГМУ, стоматологические клиники выпускников стоматологического факультета УГМУ. По окончании цикла гости отметили высокую насыщенность курса практическими занятиями, наличие наглядного материала и оснащенность классов оборудованием и инструментами. Проведение международной стажировки для иностранных студентов - это один из шагов к формированию мультиязыковой среды в ВУЗе, целью которого является вхождение в международное образовательное и научное пространств

METHODS AND MEANS OF ANALYTIC CONTROL IN METALLURGY PRODUCTION

The possibilities of testing Centre of State national University of powder metallurgy in using of different methods and devices at analytical control of production are shown. On the basis of long-term working experience of testing Centre there are given recommendations to the works laboratories on using of spectral methods on definition of elementary composition of different classes materials