rss_2.0The Scientific Bulletin of Electrical Engineering Faculty FeedSciendo RSS Feed for The Scientific Bulletin of Electrical Engineering Facultyhttps://sciendo.com/journal/SBEEFhttps://www.sciendo.comThe Scientific Bulletin of Electrical Engineering Faculty 's Coverhttps://sciendo-parsed-data-feed.s3.eu-central-1.amazonaws.com/6005e698e797941b18f2ac91/cover-image.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20220927T212117Z&X-Amz-SignedHeaders=host&X-Amz-Expires=604799&X-Amz-Credential=AKIA6AP2G7AKP25APDM2%2F20220927%2Feu-central-1%2Fs3%2Faws4_request&X-Amz-Signature=e297c6316a5f2f45ce50c05c146145cec9bf2fb61942fe57ca621ffaf0e7dacd200300Reactive Power Management in a Grid-Connected Photovoltaic Power Station: A Case-Studyhttps://sciendo.com/article/10.2478/sbeef-2021-0023<abstract> <title style='display:none'>Abstract</title> <p>The paper presents an applicative study on the power quality and energy efficiency operation for a photovoltaic power station with an installed capacity of 8.5 MW. The various operating regimes of the main network elements within the investigated photovoltaic plant are qualitatively and quantitatively. The reactive power flow in the plant that is permanently connected to the grid is especially examined. Thus, the losses within the power transformers and medium voltage cables in the plant are calculated due to the imposed by the load (often deforming and unbalanced regimes). In this manner, opportunities are identified to increase the energy efficiency of the entire system but also methods to improve the quality of energy delivered at the point of its connection to the local energy system.</p> </abstract>ARTICLE2022-02-02T00:00:00.000+00:00Entrepreneurship in the Business Market of Petroleum Products Marketinghttps://sciendo.com/article/10.2478/sbeef-2021-0018<abstract> <title style='display:none'>Abstract</title> <p>This paper presents how in the business market of oil products marketing, an entrepreneur should be constantly aware of the needs, policies and purchasing techniquesxof companies, for the precise purpose of understanding what quantity of oil/complementary oil products and liquefied petroleum gas (LPG) products he can sell. In addition, the entrepreneur must also take into account the sales aimed at individuals, which are done, in particular, through the fuel distribution stations or through the points of sale of LPG loads.</p> <p>The business market in the field of selling petroleum products includes the totality of the companies that purchase petroleum products, complementary products and LPG loads. The purpose of such companies is to produce otherxgoodsxand servicesxthat can bexsold, rented or provided to others.</p> </abstract>ARTICLE2022-02-02T00:00:00.000+00:00Smart Home: Teaching & Learninghttps://sciendo.com/article/10.2478/sbeef-2021-0014<abstract> <title style='display:none'>Abstract</title> <p>In this article we want to highlight the forced digitalization we are dealing with due to the COVID-19 pandemic and the fact that this crisis also brings benefits to the education system. The first steps in this direction were to switch to online courses to protect both teachers and students. For them at home it has become a smart home because they need online platforms, internet, PC/laptop, smartphones, webcam, all this to have access to education and to be able to develop without problems.</p> </abstract>ARTICLE2022-02-02T00:00:00.000+00:00A Case Study on the Effect of Printing Temperature on the Tensile Strength of 3D Printed Parts with PLA Materialhttps://sciendo.com/article/10.2478/sbeef-2021-0022<abstract> <title style='display:none'>Abstract</title> <p>The fusion between the layers of a 3D printed part greatly influences the overall mechanical properties and can reduce its applications in certain domains. In order to obtain a better bonding between layers a study on the influence of printing temperature on the tensile strength of 3D printed parts is needed. The mechanical experiments were made on printed parts with polylactic acid material (PLA) on an open-source 3D printer with filament fabrication technology (FFF). The study is made on parts with the same layer height, infill ratio, dimensions, printed at the same speed. The obtained results show the influence of material printing temperature and the fast cooling on the mechanical properties of the 3D printed parts.</p> </abstract>ARTICLE2022-02-02T00:00:00.000+00:00Home Automation System Using ESP8266 Microcontroller and Blynk Applicationhttps://sciendo.com/article/10.2478/sbeef-2021-0024<abstract> <title style='display:none'>Abstract</title> <p>This paper proposes the creation of a home automation system using an ESP8266 microcontroller and the Blynk application. The system consists of 2 sensors responsible for measuring the temperature/humidity and the level of brightness in the building, a 4-channel relay module responsible for controlling 4 devices/appliances/electrical installations and an LED that demonstrates its control through a PWM signal provided by the ESP8266 microcontroller. Using the Blynk application this system can be controlled and monitored via a Wi-Fi connection directly on the mobile device which makes this system an IoT (Internet of Things) one. The programming of the system was done in the Arduino IDE program using the already existing libraries for the sensors and for the Blynk application. The mobile application used for controlling and monitoring the system is able to display information about temperature /humidity, brightness and on the control side, the application allows the user to individually operate each channel of the relay module and the LED.</p> </abstract>ARTICLE2022-02-02T00:00:00.000+00:00Pressure, Temperature and Humidity Monitoring System Using the Arty Platformhttps://sciendo.com/article/10.2478/sbeef-2021-0013<abstract> <title style='display:none'>Abstract</title> <p>The paper aims to present the usefulness of Field Programmable Gate Array - based systems, the elasticity of hardware design for reuse, and the use of hardware and software resources. The proposed measurement system is a starting point for the design of a weather station capable of interpreting the variation of the size of atmospheric pressure, temperature, and humidity, which could make local weather predictions.</p> </abstract>ARTICLE2022-02-02T00:00:00.000+00:00Battery Management System for an Electric Vehiclehttps://sciendo.com/article/10.2478/sbeef-2021-0019<abstract> <title style='display:none'>Abstract</title> <p>In the electric vehicle industry, a battery management system is needed when voltages are in the value of hundreds of volts. The battery management system is not only used to estimate the remaining capacity of the batteries but also to prevent various hazards that may occur in case of improper use. The paper offers a review of the battery management system that is used in the modern electric vehicles. The system is described along with its functions including the practical methods for balancing the battery and the type of batteries used in the automotive industry.</p> </abstract>ARTICLE2022-02-02T00:00:00.000+00:00Electricity Consumption Measurement System Using ESP32https://sciendo.com/article/10.2478/sbeef-2021-0017<abstract> <title style='display:none'>Abstract</title> <p>The paper proposes the development of an IoT measurement system that offers the user the possibility to monitor and record the electricity consumed by a consumer through the Blynk application. In monitoring electricity one of its most important aspects is the calibration of the sensors used. Accurate and reliable detection is the key factor in measuring and managing electrical equipment. Fundamental physical quantities such as voltage and current are useful for determining all other electrical quantities. The ESP32 development board used to develop the system has 18 channels ADC (analog to digital converter) and supports a Wi-Fi connection at the access point and implicitly to the internet. The developed system can measure the voltage (U), current (I), power consumption (W) and consumption / hour (kWh) of a consumer, in my case for the consumer I used a light bulb with a power given by the manufacturer of 10W. The measured values are displayed on the LCD display of the system or through the Blynk application which also allows the registration of these values for a period of 12 months.</p> </abstract>ARTICLE2022-02-02T00:00:00.000+00:00Amplifier circuit with LM324 operational amplifier Analytical calculation, Octave and Orcad LITE simulationhttps://sciendo.com/article/10.2478/sbeef-2021-0015<abstract> <title style='display:none'>Abstract</title> <p>The study determines the time and frequency behavior of the LM324 operational amplifier. It determines the voltage amplification, the amplification given in dB, the waveforms made with the help of the Octave and Orcad Lite simulator and the observation a fairly good correlation between the analytical calculation and the simulation media used.</p> </abstract>ARTICLE2022-02-02T00:00:00.000+00:00The Equivalent Circuits Thévenin and Nortonhttps://sciendo.com/article/10.2478/sbeef-2021-0021<abstract> <title style='display:none'>Abstract</title> <p>The main objectives of this paper are to correctly define the equivalent Thévenin and Norton circuits and to presents the complete and exact proof of Thévenin and Norton theorems. These circuits allow the separation of the linear portions of the electronic circuits from the nonlinear ones and in this way the polarization process of the electronic devices becomes much more efficient. When linear and/or nonlinear analyzed circuits have a small number of nonlinear circuit elements, their analysis, synthesis, and simulation are performed much more efficiently if the nonlinear part of the circuit is separated from the linear one. By determining the equivalent Thévenin or Norton circuits in relation to the load to connected terminals of a system with two or more magnetic coupled coils, that are part of the wireless power transfer systems, optimal load parameters are determined so that the maximum active power is transmitted to the load.</p> </abstract>ARTICLE2022-02-02T00:00:00.000+00:00Determining the Response Over Time, Current Amplification, Input and Output Resistance of a Parallel-Series Amplifierhttps://sciendo.com/article/10.2478/sbeef-2021-0016<abstract> <title style='display:none'>Abstract</title> <p>The study determines the behavior type of the parallel-series amplifier and determines the amplification of the basic amplifier, the input and output resistance, as well as the amplification of the reaction network and the input and output resistance of the reaction network. With the help of the negative reaction, the designer can change the properties of the amplifier. Thus, a dynamic, automatic stability of the amplification system is obtained.</p> </abstract>ARTICLE2022-02-02T00:00:00.000+00:00Humidity Control of Agricultural Soil Using Analog Modelinghttps://sciendo.com/article/10.2478/sbeef-2021-0020<abstract> <title style='display:none'>Abstract</title> <p>This paper presents a simplified version of analog modeling for humidity of an agricultural soil, both isolated and included in a simple control scheme, being emphasized the application aspects for such a system. This article also includes preliminaries for agricultural soil model included in a simple humidity control scheme with some interpretation variants for evolution of processed signals for possible applications.</p> </abstract>ARTICLE2022-02-02T00:00:00.000+00:00Electrical Device Control System Through Wi-Fi Technologyhttps://sciendo.com/article/10.2478/sbeef-2021-0004<abstract> <title style='display:none'>Abstract</title> <p>The study aims for the development of a system that allows the management and control of an electrical device, this paper is an introduction to the world of smart home / IoT and transforms non-smart equipment offering the user greater control and customizable options just by connecting the desired device to the control system. The system consists of a control board that operates two relays, the relays have the main function of opening and closing the electrical circuit. The control board consists of an AMS1117 3.3V voltage lowering module, ESP8266 microcontroller and connectors for power supply and relay control. For the software part, the IDE programming language for the Arduino microcontroller was used, being an easy to use/understand and very versatile programming language.</p> </abstract>ARTICLE2021-05-29T00:00:00.000+00:00Modern Concepts of Energy-Efficient Civil and Residential Buildings. Case Study: Analysis of a Residential Building According to Nzeb Criteriahttps://sciendo.com/article/10.2478/sbeef-2021-0009<abstract> <title style='display:none'>Abstract</title> <p>The oil crisis, the measures taken because of global warming caused by greenhouse gas emissions, the ecological actions carried out globally and the technical progress in the fields of electronics, energy, IT and telecommunications have led to the emergence Passive House concepts in the construction sector, of Passive Solar Building (passive construction based on solar energy), of Net Zero-Energy Building NZEB, of Plus Energy Building, of nearly Zero Energy Building nZEB, of Low-Energy Building, of Green House, of Zero Carbon House, of Smart House, of Healthy buildings and other equivalents or derivatives.</p> <p>In this paper, these concepts will be cross-debated and the measures adopted at EU level and the influences exerted on the Romanian legislation on the field of civil and residential constructions will be presented.</p> <p>Based on a case study, a residential construction will be characterized, representative of the current housing stock, in order to assess the degree of compliance with the minimum requirements of a house with low energy consumption, imposed by Romanian legislation in the field.</p> </abstract>ARTICLE2021-05-29T00:00:00.000+00:00Study on the Use of Electrical Devices in Smart Spaces: Professional Environment Versus Personal Environmenthttps://sciendo.com/article/10.2478/sbeef-2021-0010<abstract> <title style='display:none'>Abstract</title> <p>The article addresses the issue of the attitude of Romanian consumer regarding the electrical devices that can be used at work and at home. In the context of the growing interest for these devices worldwide, the question arises what is the interest of the Romanian consumer for such devices. The research is built on a case study and uses as a method of analysis the quantitative study with questionnaire, highlighting the level of acceptance in use of different categories of electrical devices, advantages that characterize the perception of the Romanian consumer.</p> </abstract>ARTICLE2021-05-29T00:00:00.000+00:00Smart Lighting Systemhttps://sciendo.com/article/10.2478/sbeef-2021-0002<abstract> <title style='display:none'>Abstract</title> <p>This paper proposes a system that allows the control of the lights in a house, building/edifice. The system can be controlled by an application that is made in MIT App Inventor for mobile devices that use Android OS(operating system). The application sends data, via Bluetooth, to the control center, the control center powers on the selected light by turning it on and setting its intensity based on the user preferences. The control center is made from an Arduino Nano programing board, the signal used for powering the lights and setting the brightness is a PWM (Pulse Width Modulation) signal. The system contains the Arduino Nano board, Bluetooth HC-05 module for communication with the mobile application and four LED’s that are used to simulate the lights.</p> </abstract>ARTICLE2021-05-29T00:00:00.000+00:00Electrical Characteristics Measuring Device for Security Systemshttps://sciendo.com/article/10.2478/sbeef-2021-0012<abstract> <title style='display:none'>Abstract</title> <p>The study aims for the development of a device that is capable to measure and store the electrical characteristics of security systems. The development of the device is done by using the Arduino Mega 2650 board, Arduino Ethernet shield 2, SD card module, 1.8” TFT ISP LCD, keyboard module, ASC712 current sensors, A.C voltage sensors and D.C voltage sensors. The measured data from the current and voltage sensors is stored on the SD card module and sent to the user via the ethernet connection. The data obtained from the device is useful to keep track of the power consumption of any security systems. The device is capable to measure the current and voltage from 10 separate security devices (e.g. cameras, motion sensors, DVRs).</p> </abstract>ARTICLE2021-05-29T00:00:00.000+00:00Dc Motor Control System Through Android Application Using Arduino Nanohttps://sciendo.com/article/10.2478/sbeef-2021-0007<abstract> <title style='display:none'>Abstract</title> <p>The study aims for the development of a control system for D.C motors through an application made for Android mobile devices. The D.C motors are represented by a robot model car and the control application communicates with the system via Bluetooth technology. The Android mobile device user must install an application on his mobile device, then, the user must turn on the Bluetooth communication on the mobile device. The user can use various commands to control the robot model car such as front, back, stop, left, right. These commands are sent from the Android mobile device to the Bluetooth receiver, which is interfaced with the control system. The control system has a Bluetooth HC-06 receiver that receives commands from the control application and sends them to the Arduino Nano microcontroller to control the motors through two L298N drivers.</p> </abstract>ARTICLE2021-05-29T00:00:00.000+00:00Marketing Online Using Change Request Managementhttps://sciendo.com/article/10.2478/sbeef-2021-0001<abstract> <title style='display:none'>Abstract</title> <p>In this paper is presented the change request management approach of a web-based application which represents an online marketplace for local producers. Nowadays, for all type of businesses, working both offline and online is a must. In digitalization era, the fast development of a compact online marketplace platform involves both a well-established project plan and change management control system.</p> </abstract>ARTICLE2021-05-29T00:00:00.000+00:00A Study on the Energy Consumption of the Electrical and Electronic Household and Office Equipment in Standby and Off-Modehttps://sciendo.com/article/10.2478/sbeef-2021-0006<abstract> <title style='display:none'>Abstract</title> <p>The most recent generation of the electrical and electronic household and office equipment is far more efficient than its predecessor, but it is still improvable. The smart equipment, when it is used, adds the advantages of the supplementary control functions with the requirements of beeing electrically supplied. By interconnecting the smart devices in a data network, some of the energy consumption occurs even in the non-active states. These states, either a “stand-by” mode or an “off-line” mode, according to the European Committee directives, imposes maximum limits for the electricity consumption, thus an eco-design of the electrical and electronic equipment. The impact of these eco-design requirements on household appliances and office equipment with repercussions in their operation and use, as well as the energy and environmental effects, are dealt in this paper, based on a case study.</p> </abstract>ARTICLE2021-05-29T00:00:00.000+00:00en-us-1