Kazan National Research Technical University named after A.N.Tupolev) (KAI (KNRTU-KAI, full name in Russian: Казанский национальный исследовательский технический университет имени А. Н. Туполева) was established in 1932. The history of the university is closely related to the progress of Russian aeronautics. Until the recent time, it was well known as Kazan Aviation Institute (Казанский авиационный институт). In 1973, the Institute was named after Andrei Nikolayevich Tupolev, the aircraft designer. In 1992, it got the status of the State Technical University.Today the University is one of the leading Russian institutions in aircraft engineering, engine and instrument production, computer science and radio and telecommunications engineering.[citation needed] KSTU is the largest technical university of the Republic of Tatarstan and the Volga region.[citation needed]Kazan National Research Technical University teaches about 25,000 students on 65 majors in Engineering, Business and Humanitarian Sciences by the university faculty body of 1,800 persons, including 150 Full Professors & Doctor of Science degree holders, 600 Associate Professors & Ph.D. degree holders..
Development of adequate mathematic models of the mechanical properties of polymer composites with dispersed particles (PCDP) requires their verification. The following reasons complicate the verification of these mathematical models: lack of information on the mechanical properties of the transition layer at the boundary between the modified particle and the polymer; lack of information on the mechanical properties of the agglomerates that inevitably appear during the preparation of the PCDP. This study suggests a mathematical model for calculating effective mechanical properties (bulk modulus, shear modulus, Young’s modulus, and Poisson’s ratio) of the PCDP with encapsulated particles and verification of this model using PCDP samples with inclusions—nearly spherical dispersed aluminum oxide (Al2O3) particles that are not encapsulated and the particles encapsulated in a thin polymer shell. Equations for calculating the effective mechanical characteristics of these PCDPs are obtained. As demonstrated, the proposed model reliably provides the values of the bulk modulus, shear modulus, Young’s modulus and Poisson’s ratio of PCDPs with a small relative volume of dispersed submicron particles in the matrix.
The possibility of synthesizing a functionally graded material by direct laser deposition (DLD) with ultrasonic excitation was investigated. A Langevin-type transducer with an output of 100 W and a frequency of 20 kHz was used as the high-frequency vibration source. The transitional structure from EuTroLoy 16316D.04 stainless steel to the nickel alloy Inconel 625 was studied. Thanks to the ultrasonic excitation, a structure composed of equiaxed columnar dendrites was obtained. The elemental distribution along the central line of the specimens’ cross-section was analyzed. The influence of ultrasonic vibrations on the relative contents of Fe and Ni was noted, producing a smoothing of the elemental composition across the transition from one composition to the other. Microhardness analysis along a line parallel to the central line of the cross-section showed a decrease in microhardness when transitioning from 100
A combined method of direct laser deposition with ultrasonic treatment was investigated. An experimental test rig was developed to validate the method, ensuring immobilization of the substrate and protecting the Langevin ultrasonic transducer from overheating. To perform a quantitative analysis of the effect of ultrasonic treatment on the microstructure of stainless steel, a program was developed to determine the size distribution of columnar dendrites from optical images. Comparative analysis of the results showed that ultrasonic vibrations lead to refinement of the columnar dendritic structure. The average size of the columnar dendrites decreased by between 22.1 and 43.3
The paper presents a study of the plasma characteristics with non-local properties in an atmospheric-pressure microdischarge generated in a helium flow. Using a wall probe, the plasma parameters were determined: temperature of the main group of electrons; density of metastable atoms and plasma. The impurity content was also assessed N_2 , O_2 n the plasma-forming gas. Additional studies were conducted using optical spectroscopy. A comparative analysis of two methods for determining impurities in buffer helium was conducted. Optical spectroscopy allows one to determine more chemical elements in plasma OH , He , N_2 , O_2 , O and N , but not under all discharge conditions. It is shown that this discharge cell can act as an independent PLES analyzer for determining the composition of a gas mixture at atmospheric pressure, and does not require maintaining a high vacuum in the detector area.
The possibilities of synthesizing carbon nanostructures in an arc discharge between graphite electrodes in kerosene with argon supply to the discharge region were studied. It is shown that the argon-hydrocarbon arc plasma in kerosene can be used to form and harden a linear chain of nanodiamonds with sizes from 40 to 100 nm.
