The new methods of soil surface maintenance of the artificial grass establishment or growing of green manure crops applied in modern fruit-growing have been the subject of research in various ...Agra-ecological areas in Bulgaria but they are not yet implemented in the fruit-growing technology. Legumes are a basic element of these methods because of their nitrogen-fixing system. The present article summarizes our own and foreign results about the suitability of the different types of legumes in this trend. Bulgarian studies confirm the role of legumes in optimizing the nutritional and water regime of fruit crops in the conditions of the mountain or biological fruit growing. In view of the fact that there are a wide variety of morphological and biological types of legumes in Bulgaria, it is reasonable to have a special selection of varieties for soil surface maintenance in orchards.
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A model of a gas-liquid (electrolyte solution) system with charged heterogeneous surface is developed. A charged circular line (1D phase) is the substantial element of the surface ...heterogeneity, dividing the surface into inner and outer (2D) phases. The charge distribution in the bulk, as well as on the surface is in the form of Debye double layers (the Gouy-Chapman model). A generalisation of the classical bulk (3D) double layer theory is made by introducing of a surface (2D) dielectric susceptibility. The solution of the formulated non-trivial 3D-2D-1D problem is carried out by methods related to the linear theory of transmission boundary problems. The surface electric potential and its dependence on certain governing parameters are evaluated and analysed. Special attention is paid on the Maxwell stress (electrostatic surface pressure) acting on the contact line, in a context of (bio-) membrane pore mechanics.
HUMIDITY SENSING ELEMENTS BASED ON SILICA-GRAPHENE SURFACE LAYERS Nedev, Nedyu; Nenova, Zvezditza; Kozhukharov, Stephan ...
ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference,
06/2024, Letnik:
3
Journal Article
The paper presents humidity sensing elements based on silica-graphene surface layers, prepared via a sol-gel method. The samples were sintered at temperatures of 400 °C, 600 °C and 800 °C. ...Tetraethoxysilane was used as a precursor of SiO2 and as a dopant - graphene aggregates of nanoplatelets. A description of the sample preparation procedure is provided. Using a precise impedance analyzer and a calibrator for humidity and temperature, the changes in their resistance R were investigated with variations in relative humidity in the range of 30% to 90% at a temperature of 25 °C and at a frequency of 20 Hz. Morphological observations and map data analyses were carried out by Scanning Electron Microscopy (SEM) and Energy Dispersion Spectroscopy (EDX). The developed sensor elements have a good sensitivity to the humidity, and the resistance change reaches two orders of magnitude. Additions of graphene improve the sensitivity of the elements. The characteristics of the sensing elements at different sintering temperatures and different amounts of graphene dopant were modeled using an artificial neural network.
The current paper demonstrates the application of artificial neural networks for accurately classifying sunflower oil based on gas sensor responses. Through a cost-effective, custom-designed ...electronic nose with a gas sensor module, experimental data is gathered. The trained classification neural network exhibits very good precision in recognizing different classes of sunflower oil. The developed device can be used as a basis for the creation of a mobile device for recognizing the quality of food products, using gas sensors.
FPGA Based Neural Networks for Characters Recognition Ivanov, Stefan; Stankov, Stanko; Nenov, Toshko
2018 20th International Symposium on Electrical Apparatus and Technologies (SIELA),
2018-June
Conference Proceeding
The current paper presents an FPGA based artificial neural network (ANN) for character recognition. Implementation of the neural network in programmable logic brings a fast speed for character ...recognition that is difficult to be achieved with standard processor or DSP. The operation of the neural network is verified and tested using an FPGA device.
