Materials Literature
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The decomposition of knowledge into an array of “micro-knowledge” permitting a single-valued binary test score is studied. In this case, the test task is formulated as a set of micro-knowledge responses jointly revealing the knowledge level of the specific subsection. It allows presenting the development of a set of r…
The comparative analysis of various processing techniques used for the problem solution — improving the reliability and service life of the heavy duty cutting blades through the example of combine harvesters — is described. The possibility of increasing the wear resistance of the cutting knives for the agricultural ma…
T h e a p p r o xim a t e clo s e d - fo r m s olu tio n t o t h e p r o ble m o n a cir c ula r m ultila y e r ( s a n d wic h ) c o n s t a n t -t hic k n e s s pla t e b e n din g o n a n ela s tic fo u n d a tio n wit h a c o m plic a t e d s tr u c t u r e is o b t ain e d. T h e pla t e is b e n t u n d e r t h…
The aim o f t his p a p e r is t h e e fficie n c y im p r o v e m e n t o f o n e o f t h e m o s t a d v a n c e d t e c h niq u e s o f s olvin g t h e ellip tic b o u n d a r y v alu e p r o ble m s — t h e field p oin t- s o u r c e m e t h o d d e sig n a t e d a s t h e f u n d a m e n t al s olu tio n t e c h…
The biogeosystem engineering is considered, and the verification of the biological, recreational, productive-economic resources of the soil-reclamation agrotechnics based on the rotary milling subsoiling is performed. The test data of the first-generation rotary milling subsoiling facility is provided. A fundamentally…
A plant xylem is a complex system of pipes in which the movement of water occurs both vertically and horizontally. Rectilinear capillaries are arranged vertically in the trunks of lots of plants. However, a stem crown growing upwards can execute an independent circular motion called circular nutation. Some plants alwa…
Some new properties of the multiplier are determined. A class of simply connected regions whose multiplier is a connected set is described. This class is characterized by the availability of spirals in a multiplier. Let the Gelfond—Leontiev generalized differentiation operator be continuous in the space of the analyti…
The dominant occupational hazards at the welding sites are identified. They are elevated air pollution and dustiness. Depending on the welding forms, the concentrations of harmful substances (carbon oxide, iron and magnesium oxides) exceed the sanitary-hygienic standards by 7‒10 times. The heat and mass transfer of ha…
The functional diagram of a grain-cleaner with two ducts and certain air speed characteristics is described. Each pneumatic duct is segmented into blocks with various probabilistic characteristics of the airflow velocity distribution, various density composition and terminal velocities of each component. The mathemati…
In the process of gearing breaking-in, teeth are worn down. The estimation algorithm of such wear rate in the circular helical point gearing is described. The algorithm performance is illustrated by the example of calculating the circular helical gearing with the circular tooth profile in the frontal cross section. Th…
The predator-prey interactions on the spatial heterogeneous two-dimensional area are described. The model is written as a system of nonlinear parabolic equations for two closely related predator populations and two prey populations competing for the general resource. It is shown that under certain relationships betwee…
Measuring methods of the gas concentration in the working area air of the mechanical-engineering repair facilities are considered. The gas-sensitive sensor types are compared. A classification of the occupational hazards is presented; their health effect is described. The object of this study is a standard repair faci…
Algorithms of solving the “minimax” weighted graph coloring problem are considered and compared. The mathematical formulation of the problem is presented; the solution optimality criteria are stated. The exact algorithm that always finds the minimum count of colors through Maghout method and then finds the “minimax” o…
Ionoluminescence (IL) and photoluminescence (PL) of trivalent erbium ions (Er(3+)) in Gd2O3 nanopowder host activated with Bi(3+) ions has been studied in order to establish the link between changes in luminescent spectra and temperature of the sample material. IL measurements have been performed with H2 (+) 100 keV i…
The ground state band structure, magnetic moments, charges and population numbers of electronic shells of Cu and Fe atoms have been calculated for chalcopyrite CuFeS2 using density functional theory. The comparison between our calculation results and experimental data (X-ray photoemission, X-ray absorption and neutron…
Weak Electron-Phonon Coupling and Unusual Electron Scattering of Topological Surface States in Sb(111) by Laser-Based Angle-Resolved Photoemission Spectroscopy, , , , , , , , , , , , , , , , , , , , , , , , ,
We have studied the correlation between the structural distortion and the electronic/magnetic properties in single-crystalline (Lu,Sc)Fe2O4 (Sc = 0.05 and 0.3) by using X-ray diffraction (XRD), magnetic susceptibility, and X-ray absorption spectroscopy (XAS)/X-ray magnetic circular dichroism (XMCD) measurements. The R…
BACKGROUND: Four formulations of Tamoxifen citrate loaded polylactide-co-glycolide (PLGA) based nanoparticles (TNPs) were developed and characterized. Their internalization by Michigan Cancer Foundation-7 (MCF-7) breast cancer cells was also investigated. METHODS: Nanoparticles were prepared by a multiple emulsion sol…
Glioblastoma multiforme (GBM) is the most common and most aggressive malignant primary brain tumor in humans. Current GBM treatment includes surgery, radiation therapy, and chemotherapy, sometimes supplemented with novel therapies. Despite recent advances, survival of GBM patients remains poor. Major challenges in GBM…
Here we investigate LaAlO_3-SrTiO_3 heterostructure with\delta-doping of the interface by LaMnO_3 at less than one monolayer. This doping strongly inhibits the formation of mobile electron layer at the interface. This results in giant increase of the resistance and the thermopower of the heterostructure. Several aspec…