Composites La0,67Sr0,33MnO3 (SiO2, Sb2O3) with different weight ratios have been synthesized. Their magnetoresistive and dielectric properties have been investigated. It has been established that in the frequency range from 10 to 106 Hz for SiO2 concentration of 10% the colossal magnitudes of the dielectric constant ( ~ 4 • 104) take place. The values of the negative isotropic magnetoresistance for samples with silica at room temperature is 8.6%, with abarriers of antimony oxide reaches 12%, which makes it possible to use such materials in spintronics.
Keywords: Magnetoresistance, colossal dielectric permittivity, glass composites, X-ray diffraction, spin polarization, barrier layers, tunneling, microstructure, dielectric spectrum, Maxwell-Wagner effect.
The economic assessment of application of intensive technologies is presented in article (processings by the laser, ultra-violet radiation, infrared radiation). Results of researches confirm the positive influence of application of intensive technologies proved by economic calculations.
Keywords: intensive technology, application of a growthstimulyator, laser, laser processing, efficiency, productivity, quality of production, economic assessment, experiment
Sedimentation of electrodeposits with activation of a cathodic surface is in the flowing and contact way the most perspective way of restoration of internal cylindrical surfaces of details of cars. The existing devices for realization of this way have the merits and demerits, and can be therefore modernized and improved. On the basis of the analysis of the existing devices for galvanomekhanichesky sedimentation of coverings the new design is offered, novelty and which advantages is confirmed with the patent Russian Federation for the invention. The device contains the top and lower flanges in which there are branch pipes for a supply and removal of electrolyte. Between flanges the processed detail with rubber laying is established. The received tight electrolytic cell is pulled together with vertical couplers between a bed and a clamping plate. In the lower flange on a vertical axis the activating head consisting of the krylchatka bearing on herself three levers with is established by the activating elements which are movably fixed on them. Axial movement of a krylchatka is limited to the removable motionless anode. Pressing of the activating elements to the processed surface is provided at the expense of the elastic shock-absorbers located in rectangular grooves of a krylchatka and influencing the lower shoulder of levers. Tokopodvod to a detail is carried out by means of the contact device fixed on a bed, and to the anode via the contact plug from a source of a direct current. Circulation of electrolyte is provided with the acidproof hydraulic pump. The offered design is simple in production and doesn't demand existence of the expensive specialized equipment. The operating procedure with the device and sequence of operations doesn't contradict technology of sedimentation of electrodeposits. In article the main advantages of the device in relation to existing in car repair production are opened and proved.
Keywords: case detail, restoration, repair, defect, resource way of restoration, car repair production
This paper proposes a method of constructing a simulation model of the pipe, reinforced by a thin annular plate, and further analysis and definition of internal defects based on the ultrasonic non-destructive testing methods and the artificial neural networks. The influence of various physical and geometrical parameters of training neural networks was performed. Optimal structure of neural network and the type of training vectors was established.
Keywords: Crack, coating layer, functional coatings, finite-element method, artificial neural networks
The social and psychological factors influencing the status of the personality in student's group are considered in article. Data of empirical research of establishment of interrelations between levels of different types of the social and psychological status of students are provided in group and the prevailing types of the relations which are trained to each other.
Keywords: social and psychological status, interpersonal relations, student's group, emotional, business, "the psychotherapeutic status", "significant another", professional education
The presence of colossal dielectric constant in the low frequency region is observed in the strontium ferrite with hexagonal structure. This result can be explained in the framework of the "grain-layer" and the polarization of Maxwell - Wagner in the ceramic medium. The effect of negative capacitance in ceramic strontium hexaferrite at a frequency of less than 2.10 Hz has been detected.
Keywords: hexaferrite strontium, ferromagnetic, insulator, semiconductor, colossal dielectric constant, negative capacitance, high-temperature annealing, X-ray structural analysis, full-profile analysis, electron microscopy.
The main trends of updated automobile construction are the use of permanent for lowering mass overall dimension characteristics of electric equipment and an automobile as a whole. Diamond-abrasive treatment of sintered powder permanent magnets on the basis of Barium ferrite, strontium and cobalt is connected with difficulties of obtaining surfaces with little meanings of rouhness due to the higher brittleness, tendecy to crack formation, water-soluble technological lubricants (FWSTL) РВ-6 have been developed which contain fractal clusters and generate in contact diamond-abrasive tooltreated powder magnetic material of films with high load and lubricating abilities. Estimation criteria of water-soluble lubricacants efficiency (WSTL) at diamond-abrasive treatment by friction machine СМЦ-2 have been suggested. Comparative tests on the suggested criteria of efficiency FWSTL РВ- 6 and Lubricating cooland (LC) Blasokut 4000 SF 004 at treating by a diamond disk 2720-0031 ГОСТ 16167-90 of Barim ferrite 16Ба190 have been made. A conclusion has been drawn that РВ-6 possesses high efficiency.
Keywords: permanent magnet, Barium ferrite, functional water- soluble technological lubbricants, fractal cluster, diamont disk, friction machine
To achieve high accuracy of measurement of liquid flow rate using the hot-wire gauges are encouraged to use multi-segment method of spatial characteristics of the transformation. The method is based on the nonlinear three-dimensional elements. Model the spatial characteristics of the transformation is maximally adapted to the peculiarities of the conversion function of the primary transmitter. Model repeats its spatial form with the non-linearity, zero drift, the influence of external factors, including temperature. This provides a low error rate calculation of flow. Study of the effectiveness of the method was based on experimental data obtained during the calibration at different temperatures. Maximum reduced measurement error does not exceed ~ 0.45% at an arbitrary temperature, recorded during measurement.
Keywords: thermoanemometric meter spatial multi segment conversion characteristic, the error rate of fluid flow, the approximation method of least squares
This paper offers an improvement for machine vision based tracking algorithm using NARX neural network. This is achieved by predicting the next position of a mobile agent based on previous movement described by time-series functions. The algorithm remains passive and does not interfere with the quadrotr flight path until detection of multiple agent-candidates, when the tracking algorithm is not able to identify or locate the assigned agent. Meanwhile the NARX training set are updated in parallel with each successful tracking cycle. This process is done to eliminate the overfitting problem of BPTT training.
Keywords: NARX, quadrotor, agent tracking, local minimum problem, machine vision
By self-propagating high-temperature synthesis (SHTS) prepared fine powder оf La2-xSrxNiO4 composition , which is used to obtain dense ceramics exhibiting the properties of n-type semiconductor. Prolonged annealing of the samples resulted in a decrease of the conductivity on the order of 3-4, and the changing nature of the dielectric spectrum: dielectric constant ε' has a stable value of 4·104 Hz in the range of 0,4 − 1·105 Hz .
Keywords: dielectric constant, phase separation, nikelate of strontium lanthanum, self-extending high-temperature synthesis
the problems of moisture (cooling) in the mass-transfer apparatus at different parameters of fluid spray and varying the magnitude of the influence of the electric field in the zone of the spray.
Keywords: heat and mass transfer, mist dispersion, electroaerosol, electrostatic dissipation.
Today’s trend of electronics complicating makes developers to create more complex devices in a shorter time. Developers have to contrive different ways of designing automatization to prevent production worsening. However, automatization cannot improve the situation when an innovative device is developing because such developing involves a lot of testing and researches. In this article authors propose to use hardware in the loop simulation methods to optimize designing process. Hardware in the loop simulation is division the device in functional blocks, some of them are produced as models and other are produced as hardware. Usage of this method decrease cost of modernization hardware blocks and allow using a number of data processing algorithms at the same time.
The article contains a using of hardware in the loop actuality description, main steps of designing enunciation and description of method exemplified by designing of data-measuring and controlling system for automatic orientation of tropospheric communications station.
Keywords: hardware in the loop simulation; data-measuring and controlling system; design of electronic devices; development of electronic devices;
The composite cathode material of the core@shell type with the LiMn2O4@LiCoO2 formula of has been successfully synthesized using the solid-state reactions in several stages. Its structure has been studied by means of X-ray diffraction, scanning and transmission electron microscopy and vibrational infrared spectroscopy. Electrochemical investigation in two-electrode cell has been showed improvement of characteristics of the synthesized cathode material than the constituent components. The specific power of LiMn2O4@LiCoO2 is 650 mWh/g, against 450 and 500 mWh/g for LiCoO2 and LiMn2O4, respectively.
Keywords: lithium-ion batteries, cathode materials, Delafosse, X-ray structural analysis, electron microscopy, electrochemical properties
The article describes the preparation of the sensitivity of the output voltage for a typical architecture of voltage reference to variations of the parameters of elements. Also considers the main advantages of this approach in the analysis and design of circuits. The article presents the corresponding graphs sensitivities. Based on the findings conclusions about the impact of deviations of circuit elements on the output parameters of the reference voltage was done.
Keywords: Sensitivity, CMOS voltage reference, bias voltage, group bias
The solid solution of LiMn1/3Cr1/3Fe1/3O2 with the structure of α-NaFeO2 isostructural with the widely used LiCoO2 has been synthesized and investigated as a cathode material. Rated voltage of LiMn1/3Cr1/3Fe1/3O2 relative to the lithium is 4 V. The possibility of charging − discharging the material to a specific capacity of 220-250 mAh/g at currents of C/15-C/50 without phase transformations has been experimentally demonstrated.
Keywords: lithium-ion batteries, cathode materials, Delafosse, solid solution, X-ray structural analysis, electrochemical properties