Зарядовые явления в диэлектрических пленках МДП-структур при одновременном воздействии радиационных излучений и сильнополевой инжекции электронов
It has been shown that the increase of charge stability of MDS-systems can be achieved by optimal choosing the thickness of dielectric films of silicon dioxide and phosphorous soda-lime glass.
In this paper we have shown a construction of an active sensitive element of irradiation sensor. This sensor is based on metal-insulator-semiconductor structures (MIS structures). In this work we have researched an influence of α-particles to the MIS structures, which were in the mode of the constant current maintaining. This mode is characterized by the high-field Fowler- Nordheim injection. We have shown that ionization processes occurring in dielectric films of MIS structures, which are in the mode of charging and discharging of capacitance and also in the mode of high-field tunnel injection of electrons by pulse of constant current, could be used in order to register the irradiation. We have found out advantages and disadvantages of utilization of MIS sensors to register charged particles. We also have advised how to use these layers.
Special features of sputtering of the cathode with a thin dielectric film of variable thickness in a glow discharge are studied. It is shown that the flux density of atoms sputtered from the cathode is maximal on its sections with minimal film thickness due to focusing of ion flux caused by the violation of the electric field uniformity near the cathode surface. As a result, the non-uniformity of the film thickness increases with time, thereby leading to the formation of pores in the film.
Dielectric films and siliconinsulator interfaces in metalinsulatorsemiconductor (MIS) structures are modified using injectionthermal treatment, which involves highfield injection of a specified charge into the gate dielectric and subsequent annealing of the structure. The effect of the injectionthermal treatment modes on the MIS structure modification is investigated. The injectionthermal treatment is shown to reduce imperfection of the dielectric films and, thus, enhance reliability of the MIS devices. It is established that the MIS structure modification processes occurring at the injectionthermal treatment are largely identical to those occurring at the radiation thermal treatment; therefore, for certain MIS devices, the radiation thermal treatment can be replaced by the injectionthermal one.
Mechanical performances of titanium biomedical implants manufactured by superplastic forming are strongly related to the process parameters: the thickness distribution along the formed sheet has a key role in the evaluation of post-forming characteristics of the prosthesis. In this work, a finite element model able to reliably predict the thickness distribution after the superplastic forming operation was developed and validated in a case study. The material model was built for the investigated titanium alloy (Ti6Al4V-ELI) upon results achieved through free inflation tests in different pressure regimes. Thus, a strain and strain rate dependent material behaviour was implemented in the numerical model. It was found that, especially for relatively low strain rates, the strain rate sensitivity index of the investigated titanium alloy significantly decreases during the deformation process. Results on the case study highlighted that the strain rate has a strong influence on the thickness profile, both on its minimum value and on the position in which such a minimum is found.
The ХХV International scientific – technical conference “Foundry 2018” was held of the 18-20 April 2018 at “Rostov” hotel in the city of Pleven, Bulgaria. Its aim is to provide a meeting place for scholars from different countries to present their scientific achievements and to discuss the problems of casting production.
The structural and spectroscopic features of the EuAl3(BO3)4 individual skeletal microcrystals synthesized by a melt solution method have been studied. Their infrared spectra taken from the as-grown microcrystal surfaces mainly contain the lines of the rhombohedral modification of EuAl3(BO3)4 and additional peaks of its monoclinic modification. TEM and X-ray diffraction studies confirm that these additional peaks in the IR spectra belong to the monoclinic C2/c polytype of the EuAl3(BO3)4 compound. We are the first to demonstrate the presence of coherent monoclinic domains in rhombohedral EuAl3(BO3)4 crystals by TEM. Cathodoluminance spectroscopy shows that the microcrystals generate strong emission lines in the range 580–630 nm, and their intensities are strongly influenced by the crystal orientation.
This volume presents new results in the study and optimization of information transmission models in telecommunication networks using different approaches, mainly based on theiries of queueing systems and queueing networks .
The paper provides a number of proposed draft operational guidelines for technology measurement and includes a number of tentative technology definitions to be used for statistical purposes, principles for identification and classification of potentially growing technology areas, suggestions on the survey strategies and indicators. These are the key components of an internationally harmonized framework for collecting and interpreting technology data that would need to be further developed through a broader consultation process. A summary of definitions of technology already available in OECD manuals and the stocktaking results are provided in the Annex section.