Investigation of Changing Volt-Ampere Characteristics of AlGaInP Heterostructures with Multiple Quantum Wells under Ionizing Radiation

The results of research into degradation of volt-ampere characteristics of light emitting diodes produced on the base of AlGaInP heterostructures with multiple quantum wells are presented on the example of light emitting diodes (emission wavelengths 623 nm and 590 nm) under gamma quantum and fast neutron radiation in passive powering mode. The shifts of volt-ampere characteristics into the higher voltage range have been observed in conditions of increasing neutron fluence and radiation dose. The observed increase in the resistance of ohmic contacts is caused by the rising resistance of adjacent area, which in its turn results from the changing mobility of charge carriers. The latter varies with the growth of introduced defects under irradiation. Two different areas of current generation have been identified. A mechanism of current generation depends on injected charge carriers in the range of mid-level electron injection. Moreover, the range of high electron injection is distinguished by changing resistance of light emitting diode cores alongside with current generation conditioned by charge carrier injection

Bancruptcy probability diagnostics of the Zhytomyr region extractive industry enterprises

Проведено діагностику ймовірності банкрутства підприємств добувної промисловості Житомирської області. Визначено ключові проблеми діяльності.The diagnostics of the bankruptcy probability of the Zhytomyr region extractive industry enterprises is held. The key activity problems are defined

Dynamic contact angle and three-phase contact line of water drop on copper surface

Nowadays there is a lack of experimental data describing the physical process of drop spreading on a solid metal surface for developing wetting and spreading theory. The experimental data obtained by using the high speed video-recording will allow to identify unknown previously spreading modes as well as the change of the dynamic contact angle and the three-phase contact line. The purpose of the work is to determine the effect of the drop growth rate and the copper substrate surface roughness on the dynamic contact angle and the three-phase contact line speed at distilled water drop spreading. Shadow and Schlieren methods are used to obtain experimental data. Three drop spreading modes on the rough surfaces were identified. Time dependences of the dynamic contact angle and contact line speed were obtained. Experimental results can be used for assessing the validity of the developed mathematical models of wetting and spreading processes in the field of micro- and nano-electronics, ink jet printing, thin-film coatings, spray cooling, and optoelectronics

Conceptualization of user activities in the social network in the conditions of distance education

No artigo, as mídias sociais são analisadas através do foco de entender este último como um espaço virtual da mídia, o que reflete indicadores identificados dos usuários como: interesse, desejo, entusiasmo e direção dos processos de integração. A relevância do estudo é determinada pelo desenvolvimento insuficiente e inconsistência dos conceitos e resultados empíricos da pesquisa sobre os processos de diferenciação da comunidade das redes sociais e seu papel nas condições da educação a distância. Foram utilizados os métodos filosóficos, de análise e hermenêutica: interpretação, conceituação, análise comparativa. Como base teórica e metodológica, utilizamos o aparato categórico da filosofia social, matemática, teoria da prática, pragmatismo, epistemologia social. Utilizamos abordagens para extrair a atividade de grupos de usuários em uma rede social de várias camadas: 1) extrair grupos em cada camada separadamente e, em seguida, combinar comunidades em todas as camadas; 2) primeiro transformar a rede social em uma camada e, em seguida, procurar diferentes grupos dentro

A new low-complexity patch-based image super-resolution

In this study, a novel single image super-resolution (SR) method, which uses a generated dictionary from pairs of high-resolution (HR) images and their corresponding low-resolution (LR) representations, is proposed. First, HR and LR dictionaries are created by dividing HR and LR images into patches Afterwards, when performing SR, the distance between every patch of the input LR image and those of available LR patches in the LR dictionary are calculated. The minimum distance between the input LR patch and those in the LR dictionary is taken, and its counterpart from the HR dictionary will be passed through an illumination enhancement process resulting in consistency of illumination between neighbour patches. This process is applied to all patches of the LR image. Finally, in order to remove the blocking effect caused by merging the patches, an average of the obtained HR image and the interpolated image is calculated. Furthermore, it is shown that the stabe of dictionaries is reducible to a great degree. The speed of the system is improved by 62.5%. The quantitative and qualitative analyses of the experimental results show the superiority of the proposed technique over the conventional and state-of-the-art methods

Clinical and laboratory indicators in pregnant women with preeclampsia

The objective of this study is to compare clinical and laboratory indicators in pregnant women with preeclampsia (PE) compared with women with physiological pregnancy. The study group included 209 women with physiological pregnancy and 250 pregnant women with PE. We studied coagulogram data, biochemical blood analysis, and the level of systolic and diastolic blood pressure before and during pregnanc