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This paper presents a methodology for parameters extraction of photovoltaic cell based on real measurement. The modeling of equivalent schemes of solar cells is of great importance in order to be included in electric circuits for wireless sensor networks power supply. The parameters extraction of these devices is still a very difficult task, which requires experimental data, computing and modeling...
One of our most vital resources nowadays is fresh water. Water quality refers to the condition of the water, including chemical, biological and physical characteristics with respect to its suitability for a particular purpose. The main purpose of this publication is to set up a virtual system for water analysis in order to measure particular parameters of the water before and after physicochemical...
A library of block-elements that mimics the behavior of the hydrogen bonds of Green Fluorescent Protein is created in Cadence for bioelectronics applications. A circuit is designed with these elements that model the architecture and behavior of the analogous hydrogen bonding networks of the protein. The circuit is studied by DC and transient analyses. The DC analysis shows that the output voltage...
The water quality analysis is important for human health and environmental protection. There are many physical and chemical methods for such analysis, with different accuracies, complexity and time consumption. In the presented paper, a colorimetric method, based on virtual instrumentation is suggested and considered in details. At the end of the paper, the concentration of free chlorine in water...
Air pollution is both an environmental and a social problem, as it leads to a multitude of adverse effects on human health, ecosystems and the climate. Air pollution is one of the largest environmental health risks in Europe today. Quality of the air in city and urban areas is the most important factor that directly influences the incidence of diseases and decreases the quality of life. Taking appropriate...
Two hydrogen bonding networks (HBN) that are extracted from the β-lactamase protein are presented and studied in the present paper. The HBNs are formed in the active site of ß-lactamase when β-lactamase is in transient state (T1). The hydrogen bonds are modeled as three or four-terminal block elements analogous to classic electrical multi-terminal networks. Each block element is coded in Matlab and...
Noise pollution in urban environments is a common problem that affects people's health and quality of life. It is therefore one of the main issues addressed in many studies of environmental noise level assessment. The equivalent sound pressure level (LAeq) is one of the most widely used indicators for evaluating environmental noise from roads, railways, and industry. According to the European framework...
Carbon dioxide sensors are extensively used in modern ventilation systems. Their accuracy and long term stability can crucially affect the overall effectiveness of the systems. This study is focused on the investigation of the possibilities for improving the accuracy of the most often used CO2 sensors in ventilation systems, namely the non-dispersive infrared (NDIR) sensors. An important problem with...
A microelectronic circuit of block-elements functionally analogous to two hydrogen bonding networks is investigated in the present paper. The hydrogen bonding networks are extracted from Michaelis complex of β-lactamase protein. They are described by electrical circuits. The hydrogen bonds of the networks are presented by three- or four-terminal block-elements in the juxtaposed electrical circuits...
The paper presents the remote laboratory practice in computer added design of integrated circuits within the European project “Remote-labs Access in Internet-based Performance-Centered Learning Environment for Curriculum Support”. The ECAD laboratory at the Technical University of Sofia implemented a remote access to the professional microelectronics software (very expensive and running only on workstations)...
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