21.
Kanevskiy, M; Borisova, E; Mironova, I; Konnova, S; Galitskaya, A; Khorovodov, A; Agranovich, I; Pavlova, P; Avramov, L; Semyachkina-Glushkovskaya, O
Stress-induced gastric adenocarcinoma: Fluorescent and electrical measurements Journal Article
In: Journal of Optoelectronics and Advanced Materials, vol. 22, no. 5-6, pp. 316-322, 2020, ISSN: 14544164, (cited By 0).
Abstract | Links | BibTeX | Етикети: cst
@article{Kanevskiy2020316,
title = {Stress-induced gastric adenocarcinoma: Fluorescent and electrical measurements},
author = {M Kanevskiy and E Borisova and I Mironova and S Konnova and A Galitskaya and A Khorovodov and I Agranovich and P Pavlova and L Avramov and O Semyachkina-Glushkovskaya},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85090525717\&partnerID=40\&md5=212d0dbefcdd10081ef9492d2f96b481},
issn = {14544164},
year = {2020},
date = {2020-01-01},
journal = {Journal of Optoelectronics and Advanced Materials},
volume = {22},
number = {5-6},
pages = {316-322},
publisher = {National Institute of Optoelectronics},
abstract = {We studied gender differences in gastric tumor in rats using original model of gastric adenocarcinoma and photodiagnostics with delta-aminolevulinic acid, and impedance measurements of the stomach, liver and red blood cells in rats of both genders. Highly heterogeneous gastric adenocarcinoma in rats of both genders was induced by means of a prolonged exposure to social and chemical stresses. Exogenous fluorescence mapping using 5-aminolevulinic acid / protoporphyrin IX was performed on the developed tumors, and the suspicious areas were investigated and compared with the surrounding intact tissues by electrical bio-impedancemetry techniques. The histological data revealed significant gender differences in as the number of male rats with neoplasia was higher by a factor of 1.5. Exogenous fluorescence maps were detected in gastric cancerous areas, but no gender correlation was observed. Significant gender differences were revealed when bioelectrical impedance and polarization coefficients patterns were measured. In some cases, photodiagnosis yielded a false-positive exogenous fluorescence due to dye accumulation in benign and inflammatory mucosal areas and the application of additional methods, such as impedance measurement of gastric tissues and red blood cells might prove to be a promising way of improving the diagnostic efficiency of photodiagnosis, including gender-related aspects. © 2020 National Institute of Optoelectronics. All rights reserved.},
note = {cited By 0},
keywords = {cst},
pubstate = {published},
tppubtype = {article}
}
We studied gender differences in gastric tumor in rats using original model of gastric adenocarcinoma and photodiagnostics with delta-aminolevulinic acid, and impedance measurements of the stomach, liver and red blood cells in rats of both genders. Highly heterogeneous gastric adenocarcinoma in rats of both genders was induced by means of a prolonged exposure to social and chemical stresses. Exogenous fluorescence mapping using 5-aminolevulinic acid / protoporphyrin IX was performed on the developed tumors, and the suspicious areas were investigated and compared with the surrounding intact tissues by electrical bio-impedancemetry techniques. The histological data revealed significant gender differences in as the number of male rats with neoplasia was higher by a factor of 1.5. Exogenous fluorescence maps were detected in gastric cancerous areas, but no gender correlation was observed. Significant gender differences were revealed when bioelectrical impedance and polarization coefficients patterns were measured. In some cases, photodiagnosis yielded a false-positive exogenous fluorescence due to dye accumulation in benign and inflammatory mucosal areas and the application of additional methods, such as impedance measurement of gastric tissues and red blood cells might prove to be a promising way of improving the diagnostic efficiency of photodiagnosis, including gender-related aspects. © 2020 National Institute of Optoelectronics. All rights reserved.
22.
Tsvetkov, V; Spasov, G; Petrova, G
IoT solution for monitoring of data in the visible and infrared spectrum Conference
Institute of Electrical and Electronics Engineers Inc., 2020, ISBN: 9781728174266, (cited By 0).
Abstract | Links | BibTeX | Етикети: cst, e
@conference{Tsvetkov2020,
title = {IoT solution for monitoring of data in the visible and infrared spectrum},
author = {V Tsvetkov and G Spasov and G Petrova},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85097105673\&doi=10.1109%2fET50336.2020.9238289\&partnerID=40\&md5=d82b7d4199384b330e7f8dee1c7aca2f},
doi = {10.1109/ET50336.2020.9238289},
isbn = {9781728174266},
year = {2020},
date = {2020-01-01},
journal = {2020 29th International Scientific Conference Electronics, ET 2020 - Proceedings},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
abstract = {In this paper a cost-effective combination between infrared and visible camera for thermal imaging applicable in Ambient Assisted Living (AAL) and object monitoring in smart homes is presented and demonstrated. In recent years, we have witnessed a rapid surge in assisted living technologies. Internet of Things (IoT) is a platform where every day devices become smarter, everyday processing becomes intelligent, and every day communication becomes informative. Our implementation is based on four layers IoT architecture. The user interface provides an option for manual adjustment of the image alignment from infrared and visible cameras. Apart from manual procedure, a procedure for the automatic alignment of the images of the both cameras have been developed. The time necessary for the image data processing by the microcontroller which gathers data from the sensors or by the gateway device is estimated. © 2020 IEEE.},
note = {cited By 0},
keywords = {cst, e},
pubstate = {published},
tppubtype = {conference}
}
In this paper a cost-effective combination between infrared and visible camera for thermal imaging applicable in Ambient Assisted Living (AAL) and object monitoring in smart homes is presented and demonstrated. In recent years, we have witnessed a rapid surge in assisted living technologies. Internet of Things (IoT) is a platform where every day devices become smarter, everyday processing becomes intelligent, and every day communication becomes informative. Our implementation is based on four layers IoT architecture. The user interface provides an option for manual adjustment of the image alignment from infrared and visible cameras. Apart from manual procedure, a procedure for the automatic alignment of the images of the both cameras have been developed. The time necessary for the image data processing by the microcontroller which gathers data from the sensors or by the gateway device is estimated. © 2020 IEEE.
23.
Pazhev, G; Spasov, G; Shopov, M; Petrova, G
On the use of blockchain technologies in smart home applications Conference
vol. 878, no. 1, Institute of Physics Publishing, 2020, ISSN: 17578981, (cited By 0).
Abstract | Links | BibTeX | Етикети: cst, e
@conference{Pazhev2020,
title = {On the use of blockchain technologies in smart home applications},
author = {G Pazhev and G Spasov and M Shopov and G Petrova},
editor = {Shakev Ahmed N S Nikolov V. Petrov M.},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85089004112\&doi=10.1088%2f1757-899X%2f878%2f1%2f012023\&partnerID=40\&md5=4e5341aa8ee1b31b85ef7d86d0a162cb},
doi = {10.1088/1757-899X/878/1/012023},
issn = {17578981},
year = {2020},
date = {2020-01-01},
journal = {IOP Conference Series: Materials Science and Engineering},
volume = {878},
number = {1},
publisher = {Institute of Physics Publishing},
abstract = {The paper presents an implementation of a smart home architecture with two gateways based on collaboration of blockchain technology and Internet of Things (IoT) Message oriented middleware (MOM) architecture for management of internal home appliances. A basic overview of IoT MOM, MQTT (Message Queue Telemetry Transfer) protocol and blockchain architectures is made and the key characteristics and consensus algorithms are presented. Some challenges and the Ethereum smart contracts concept of the blockchain technology are discussed. © 2020 IOP Publishing Ltd. All rights reserved.},
note = {cited By 0},
keywords = {cst, e},
pubstate = {published},
tppubtype = {conference}
}
The paper presents an implementation of a smart home architecture with two gateways based on collaboration of blockchain technology and Internet of Things (IoT) Message oriented middleware (MOM) architecture for management of internal home appliances. A basic overview of IoT MOM, MQTT (Message Queue Telemetry Transfer) protocol and blockchain architectures is made and the key characteristics and consensus algorithms are presented. Some challenges and the Ethereum smart contracts concept of the blockchain technology are discussed. © 2020 IOP Publishing Ltd. All rights reserved.
24.
Georgiev, N P; Raychev, R P
Study of a linear generator with permanent magnets converting sea wave energy into electricity Conference
vol. 878, no. 1, Institute of Physics Publishing, 2020, ISSN: 17578981, (cited By 0).
Abstract | Links | BibTeX | Етикети: ee
@conference{Georgiev2020,
title = {Study of a linear generator with permanent magnets converting sea wave energy into electricity},
author = {N P Georgiev and R P Raychev},
editor = {Shakev Ahmed N S Nikolov V. Petrov M.},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85088978330\&doi=10.1088%2f1757-899X%2f878%2f1%2f012019\&partnerID=40\&md5=740abc5e961300166b7bcf22d017ca08},
doi = {10.1088/1757-899X/878/1/012019},
issn = {17578981},
year = {2020},
date = {2020-01-01},
journal = {IOP Conference Series: Materials Science and Engineering},
volume = {878},
number = {1},
publisher = {Institute of Physics Publishing},
abstract = {This paper studies the output electrical parameters of a linear generator with permanent magnets without an iron core for three types of electrical connection of its windings. Software simulations have been performed by means of ANSYS 2019 R1 and FEMM, and experimental studies of the linear generator have been carried out. A model has been obtained, which simulates the operation of the generator under study with good level of precision. The optimal scheme of connecting the generator windings, which is suitable for practical realization, has been determined. © 2020 IOP Publishing Ltd. All rights reserved.},
note = {cited By 0},
keywords = {ee},
pubstate = {published},
tppubtype = {conference}
}
This paper studies the output electrical parameters of a linear generator with permanent magnets without an iron core for three types of electrical connection of its windings. Software simulations have been performed by means of ANSYS 2019 R1 and FEMM, and experimental studies of the linear generator have been carried out. A model has been obtained, which simulates the operation of the generator under study with good level of precision. The optimal scheme of connecting the generator windings, which is suitable for practical realization, has been determined. © 2020 IOP Publishing Ltd. All rights reserved.
25.
Georgiev, N P; Raychev, R P
Study of four-spring electromagnetic harvesters Conference
vol. 878, no. 1, Institute of Physics Publishing, 2020, ISSN: 17578981, (cited By 0).
Abstract | Links | BibTeX | Етикети: ee
@conference{Georgiev2020b,
title = {Study of four-spring electromagnetic harvesters},
author = {N P Georgiev and R P Raychev},
editor = {Shakev Ahmed N S Nikolov V. Petrov M.},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85088971393\&doi=10.1088%2f1757-899X%2f878%2f1%2f012018\&partnerID=40\&md5=e340f149434d0edd10eecabf2cc81613},
doi = {10.1088/1757-899X/878/1/012018},
issn = {17578981},
year = {2020},
date = {2020-01-01},
journal = {IOP Conference Series: Materials Science and Engineering},
volume = {878},
number = {1},
publisher = {Institute of Physics Publishing},
abstract = {The article considers electromagnetic harvesters, consisting of a metal plate, fixed on four springs at their lower end, and having 2 or 4 magnets. A coil is located above the magnets. Modeling by ANSYS has been done, and the horizontal deviation of the mechanical system has been obtained. With the help of FEMM, the magnetic field of the electromagnetic harvesters has been modeled and their electromotive force has been determined. Experimental studies have been performed to verify the modeling. The influence of the construction parameters on the output electric features of the studied harvesters has been considered. © 2020 IOP Publishing Ltd. All rights reserved.},
note = {cited By 0},
keywords = {ee},
pubstate = {published},
tppubtype = {conference}
}
The article considers electromagnetic harvesters, consisting of a metal plate, fixed on four springs at their lower end, and having 2 or 4 magnets. A coil is located above the magnets. Modeling by ANSYS has been done, and the horizontal deviation of the mechanical system has been obtained. With the help of FEMM, the magnetic field of the electromagnetic harvesters has been modeled and their electromotive force has been determined. Experimental studies have been performed to verify the modeling. The influence of the construction parameters on the output electric features of the studied harvesters has been considered. © 2020 IOP Publishing Ltd. All rights reserved.
26.
Georgiev, N; Raychev, R
Study of two- And four- spring electromagnetic harvesters Conference
Institute of Electrical and Electronics Engineers Inc., 2020, ISBN: 9781728143460, (cited By 0).
Abstract | Links | BibTeX | Етикети: ee
@conference{Georgiev2020c,
title = {Study of two- And four- spring electromagnetic harvesters},
author = {N Georgiev and R Raychev},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85091344219\&doi=10.1109%2fSIELA49118.2020.9167100\&partnerID=40\&md5=e5ab81ce321bbbead735f04a13c38237},
doi = {10.1109/SIELA49118.2020.9167100},
isbn = {9781728143460},
year = {2020},
date = {2020-01-01},
journal = {2020 21st International Symposium on Electrical Apparatus and Technologies, SIELA 2020 - Proceedings},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
abstract = {The paper presents a study of two- and four- spring electromagnetic harvesters, consisting of П-shaped plates with 4 magnets mounted on two or four springs, rigidly fixed at their low ends. A coil is placed between the magnets. Modeling by means of ANSYS has been performed and the horizontal deviation of the mechanical system has been obtained. The magnetic fields of the electromagnetic harvesters have been modeled by means of FEMM. Their electromotive forces (e.m.f.) and power have been defined. Experiments for validating the models have been conducted. © 2020 IEEE.},
note = {cited By 0},
keywords = {ee},
pubstate = {published},
tppubtype = {conference}
}
The paper presents a study of two- and four- spring electromagnetic harvesters, consisting of П-shaped plates with 4 magnets mounted on two or four springs, rigidly fixed at their low ends. A coil is placed between the magnets. Modeling by means of ANSYS has been performed and the horizontal deviation of the mechanical system has been obtained. The magnetic fields of the electromagnetic harvesters have been modeled by means of FEMM. Their electromotive forces (e.m.f.) and power have been defined. Experiments for validating the models have been conducted. © 2020 IEEE.
27.
Georgiev, N; Raychev, R
Study of a linear generator, converting sea wave energy into electricity Conference
Institute of Electrical and Electronics Engineers Inc., 2020, ISBN: 9781728143460, (cited By 0).
Abstract | Links | BibTeX | Етикети: ee
@conference{Georgiev2020d,
title = {Study of a linear generator, converting sea wave energy into electricity},
author = {N Georgiev and R Raychev},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85091341043\&doi=10.1109%2fSIELA49118.2020.9167118\&partnerID=40\&md5=8277d9c843273e3b08d49d1851bc6295},
doi = {10.1109/SIELA49118.2020.9167118},
isbn = {9781728143460},
year = {2020},
date = {2020-01-01},
journal = {2020 21st International Symposium on Electrical Apparatus and Technologies, SIELA 2020 - Proceedings},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
abstract = {This paper presents a study of the influence on the electrical parameters of a linear generator with permanent magnets and no iron core, exerted by the number of its windings, connected in series, the number of their turns and the dimensions of the air gap between the magnets and the windings. Program simulations with ANSYS 2019 R1 and FEMM 4.2 have been performed and experimental studies of the linear generator have been carried out. The obtained model with good accuracy simulates the operation of the studied generator. When the construction is optimized, the electrical parameters of the generator significantly improve. © 2020 IEEE.},
note = {cited By 0},
keywords = {ee},
pubstate = {published},
tppubtype = {conference}
}
This paper presents a study of the influence on the electrical parameters of a linear generator with permanent magnets and no iron core, exerted by the number of its windings, connected in series, the number of their turns and the dimensions of the air gap between the magnets and the windings. Program simulations with ANSYS 2019 R1 and FEMM 4.2 have been performed and experimental studies of the linear generator have been carried out. The obtained model with good accuracy simulates the operation of the studied generator. When the construction is optimized, the electrical parameters of the generator significantly improve. © 2020 IEEE.
28.
Georgiev, N; Raychev, R
Study of a coupled piezo-electromagnetic harvester Conference
Institute of Electrical and Electronics Engineers Inc., 2020, ISBN: 9781728143460, (cited By 0).
Abstract | Links | BibTeX | Етикети: ee
@conference{Georgiev2020e,
title = {Study of a coupled piezo-electromagnetic harvester},
author = {N Georgiev and R Raychev},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85091335801\&doi=10.1109%2fSIELA49118.2020.9167094\&partnerID=40\&md5=601b88f1cac01603f1de951e46a2c80a},
doi = {10.1109/SIELA49118.2020.9167094},
isbn = {9781728143460},
year = {2020},
date = {2020-01-01},
journal = {2020 21st International Symposium on Electrical Apparatus and Technologies, SIELA 2020 - Proceedings},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
abstract = {The paper presents a study of a coupled piezoelectromagnetic harvester, consisting of a piezo-harvester and an attached to it electromagnetic harvester. Modeling in ANSYS has been performed, by means of which the horizontal deviation of the mechanical system has been obtained and the accumulated charge on the electrodes of the piezo-harvester has been calculated. The magnetic field of the electromagnetic harvester has been modeled with the help of FEMM and its electromotive force (e.m.f.) has been defined. Equivalent circuits have been drawn and experiments for validation of the developed models have been conducted. © 2020 IEEE.},
note = {cited By 0},
keywords = {ee},
pubstate = {published},
tppubtype = {conference}
}
The paper presents a study of a coupled piezoelectromagnetic harvester, consisting of a piezo-harvester and an attached to it electromagnetic harvester. Modeling in ANSYS has been performed, by means of which the horizontal deviation of the mechanical system has been obtained and the accumulated charge on the electrodes of the piezo-harvester has been calculated. The magnetic field of the electromagnetic harvester has been modeled with the help of FEMM and its electromotive force (e.m.f.) has been defined. Equivalent circuits have been drawn and experiments for validation of the developed models have been conducted. © 2020 IEEE.
29.
Hadzhiev, I.
Influence of the Cooling Conditions on the Heating of a Power Distribution Block Conference
vol. 878, no. 1, Institute of Physics Publishing, 2020, ISBN: 9781728186511, (cited By 0).
Abstract | Links | BibTeX | Етикети: ee
@conference{Hadzhiev2020,
title = {Influence of the Cooling Conditions on the Heating of a Power Distribution Block},
author = {I. Hadzhiev},
editor = {Shakev Ahmed N S Nikolov V. Petrov M.},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85102727306\&doi=10.1109%2fHiTech51434.2020.9363974\&partnerID=40\&md5=e662ffe1456528283b433c6bdd217191},
doi = {10.1109/HiTech51434.2020.9363974},
isbn = {9781728186511},
year = {2020},
date = {2020-01-01},
urldate = {2020-01-01},
journal = {3rd International Conference on High Technology for Sustainable Development, HiTech 2020 - Proceedings},
volume = {878},
number = {1},
publisher = {Institute of Physics Publishing},
abstract = {This paper studies the influence of the cooling conditions on the heating of a low voltage power distribution block (PDB) of terminals. The heating of the PDB has been considered in the following cases: closed PDB and consideration of the thermodynamic processes in it and heat transfer toward the environment by means of radiation and convection; open power distribution block (without cover) and heat transfer to the surroundings through radiation and convection; terminal block with ventilation openings on its cover and consideration of the thermodynamic processes in the block, heat transfer to the environment through radiation and convection. The study has been conducted using computer models elaborated in the software product COMSOL. The related problem 'electric field - thermal field - fluid field' has been solved. A juxtaposition of the acquired numerical results has been made. © 2020 IEEE.},
note = {cited By 0},
keywords = {ee},
pubstate = {published},
tppubtype = {conference}
}
This paper studies the influence of the cooling conditions on the heating of a low voltage power distribution block (PDB) of terminals. The heating of the PDB has been considered in the following cases: closed PDB and consideration of the thermodynamic processes in it and heat transfer toward the environment by means of radiation and convection; open power distribution block (without cover) and heat transfer to the surroundings through radiation and convection; terminal block with ventilation openings on its cover and consideration of the thermodynamic processes in the block, heat transfer to the environment through radiation and convection. The study has been conducted using computer models elaborated in the software product COMSOL. The related problem 'electric field - thermal field - fluid field' has been solved. A juxtaposition of the acquired numerical results has been made. © 2020 IEEE.
30.
Hadzhiev, I; Malamov, D; Balabozov, I; Yatchev, I
Institute of Electrical and Electronics Engineers Inc., 2020, ISBN: 9781728143460, (cited By 0).
Abstract | Links | BibTeX | Етикети: ee
@conference{Hadzhiev2020b,
title = {Study of operational parameters of a capacitor bank with detuned reactor for power factor correction in a low voltage network},
author = {I Hadzhiev and D Malamov and I Balabozov and I Yatchev},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85091335433\&doi=10.1109%2fSIELA49118.2020.9167141\&partnerID=40\&md5=1defa7590a62d53c66b437f1d411fbb5},
doi = {10.1109/SIELA49118.2020.9167141},
isbn = {9781728143460},
year = {2020},
date = {2020-01-01},
journal = {2020 21st International Symposium on Electrical Apparatus and Technologies, SIELA 2020 - Proceedings},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
abstract = {The paper presents the results from a study of a capacitor bank with detuned reactor for power factor correction in a three-phase low voltage network. The effect of the high harmonics in the network, as well as the influence of the inductance of the detuned reactor on the operational parameters of the three-phase capacitor bank have been studied by means of a computer model, synthesized in Matlab/Simulink. The parameters of the network have been taken into account. The studies have been performed at the following values of capacitive power of the capacitor bank: 10kVAr, 30kVAr, 50kVAr and 60kVAr. Conclusions have been made and recommendations given concerning the choice of a detuned reactor for power factor correction devices. © 2020 IEEE.},
note = {cited By 0},
keywords = {ee},
pubstate = {published},
tppubtype = {conference}
}
The paper presents the results from a study of a capacitor bank with detuned reactor for power factor correction in a three-phase low voltage network. The effect of the high harmonics in the network, as well as the influence of the inductance of the detuned reactor on the operational parameters of the three-phase capacitor bank have been studied by means of a computer model, synthesized in Matlab/Simulink. The parameters of the network have been taken into account. The studies have been performed at the following values of capacitive power of the capacitor bank: 10kVAr, 30kVAr, 50kVAr and 60kVAr. Conclusions have been made and recommendations given concerning the choice of a detuned reactor for power factor correction devices. © 2020 IEEE.
31.
Balabozov, I; Tomov, D; Yatchev, I; Hadzhiev, I; Brauer, H
Institute of Electrical and Electronics Engineers Inc., 2020, ISBN: 9781728143460, (cited By 1).
Abstract | Links | BibTeX | Етикети: ee
@conference{Balabozov2020,
title = {Experimental study of the influence of some parameters on the characteristics of hybrid electromagnetic system with magnetic flux modulation},
author = {I Balabozov and D Tomov and I Yatchev and I Hadzhiev and H Brauer},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85091340158\&doi=10.1109%2fSIELA49118.2020.9167093\&partnerID=40\&md5=d6ea773ae39188b7376d75d8048c11a2},
doi = {10.1109/SIELA49118.2020.9167093},
isbn = {9781728143460},
year = {2020},
date = {2020-01-01},
journal = {2020 21st International Symposium on Electrical Apparatus and Technologies, SIELA 2020 - Proceedings},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
abstract = {Experimental study of a prototype of hybrid electromagnetic system with magnetic flux modulation is carried out with specially assembled control and measurement circuits. Also, software algorithm and computer graphical interface for controlling of the system and for visualisation of the achieved results have been developed. Results are obtained for the current through the coils and for the changes of the magnetic flux. Two different measurement sensors are used in order to verify the accuracy of the results for the current through the coils, © 2020 IEEE.},
note = {cited By 1},
keywords = {ee},
pubstate = {published},
tppubtype = {conference}
}
Experimental study of a prototype of hybrid electromagnetic system with magnetic flux modulation is carried out with specially assembled control and measurement circuits. Also, software algorithm and computer graphical interface for controlling of the system and for visualisation of the achieved results have been developed. Results are obtained for the current through the coils and for the changes of the magnetic flux. Two different measurement sensors are used in order to verify the accuracy of the results for the current through the coils, © 2020 IEEE.
32.
Malamov, D; Hadzhiev, I; Zlatanova, V; Terzieva, S; Georgiev, A
Analysis of a wind farm with SCIG integrated into a high power system Journal Article
In: COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, vol. 39, no. 3, pp. 637-645, 2020, ISSN: 03321649, (cited By 0).
Abstract | Links | BibTeX | Етикети: ee
@article{Malamov2020637,
title = {Analysis of a wind farm with SCIG integrated into a high power system},
author = {D Malamov and I Hadzhiev and V Zlatanova and S Terzieva and A Georgiev},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85082410859\&doi=10.1108%2fCOMPEL-10-2019-0383\&partnerID=40\&md5=a13e5bb044ea5694729ee9dbc38ea4f8},
doi = {10.1108/COMPEL-10-2019-0383},
issn = {03321649},
year = {2020},
date = {2020-01-01},
journal = {COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering},
volume = {39},
number = {3},
pages = {637-645},
publisher = {Emerald Group Publishing Ltd.},
abstract = {Purpose: The aim of this paper is a steady-state analysis of the basic electrical characteristics of a wind farm with squirrel-cage induction generators (SCIG), integrated into a high power system. The SCIG are connected to the system by means of a step-up substation 21/115 kV, realized by cable lines. Design/methodology/approach: The analyses have been done with the help of a computer model, developed in MATLAB/Simulink. Findings: Results have been obtained, concerning the influence of the SCIG on the active and reactive power, on the power factor and the voltage deviation in the cases of only one generator operating, all generators operating and disabled generators. Practical implications: The analysis has been carried out for an operating wind farm in the power system. The obtained results are applicable for optimizing and managing the modes of operation of the wind farm. Originality/value: A mathematical model for studying the electrical parameters of an SCIG integrated into a high power system has been described. A computer model in MATLAB/Simulink has been synthesized. Numerical results have been obtained, concerning the dependence of the active power, the reactive power, the power factor and the voltage deviation on the shaft torque of the wind farms with SCIG. © 2020, Emerald Publishing Limited.},
note = {cited By 0},
keywords = {ee},
pubstate = {published},
tppubtype = {article}
}
Purpose: The aim of this paper is a steady-state analysis of the basic electrical characteristics of a wind farm with squirrel-cage induction generators (SCIG), integrated into a high power system. The SCIG are connected to the system by means of a step-up substation 21/115 kV, realized by cable lines. Design/methodology/approach: The analyses have been done with the help of a computer model, developed in MATLAB/Simulink. Findings: Results have been obtained, concerning the influence of the SCIG on the active and reactive power, on the power factor and the voltage deviation in the cases of only one generator operating, all generators operating and disabled generators. Practical implications: The analysis has been carried out for an operating wind farm in the power system. The obtained results are applicable for optimizing and managing the modes of operation of the wind farm. Originality/value: A mathematical model for studying the electrical parameters of an SCIG integrated into a high power system has been described. A computer model in MATLAB/Simulink has been synthesized. Numerical results have been obtained, concerning the dependence of the active power, the reactive power, the power factor and the voltage deviation on the shaft torque of the wind farms with SCIG. © 2020, Emerald Publishing Limited.
33.
Penkov, S; Taneva, A; Kazala, R
Supervisory and Data Acquisition project with LoRa Conference
Institute of Electrical and Electronics Engineers Inc., 2020, ISBN: 9781728193083, (cited By 0).
Abstract | Links | BibTeX | Етикети: cs
@conference{Penkov2020,
title = {Supervisory and Data Acquisition project with LoRa},
author = {S Penkov and A Taneva and R Kazala},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85100094089\&doi=10.1109%2fICAI50593.2020.9311338\&partnerID=40\&md5=3e4aa2393ead889ba4ca1bfcd4eaa081},
doi = {10.1109/ICAI50593.2020.9311338},
isbn = {9781728193083},
year = {2020},
date = {2020-01-01},
journal = {2020 International Conference Automatics and Informatics, ICAI 2020 - Proceedings},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
abstract = {The goal of this work is to present the developed project in Grafana, which is an open environment for Supervisory Control and Data Acquisition (SCADA). It occupies a high level in the hierarchy of the control system. The new here is the low radio (LoRa) signal applied at field level of hierarchical industrial systems. In this way combination of low energy protocol, in fieldbus, and open platform for monitoring and data acquisition, in high information level is achieved. An advantage here is related to the low energy protocol that is applied in industrial systems. In the created project a combination of LoRa and Open Grafana is main contribution of the work. Hence the article is useful for the upcoming Industry 4.0, which needs and uses such solutions. © 2020 IEEE.},
note = {cited By 0},
keywords = {cs},
pubstate = {published},
tppubtype = {conference}
}
The goal of this work is to present the developed project in Grafana, which is an open environment for Supervisory Control and Data Acquisition (SCADA). It occupies a high level in the hierarchy of the control system. The new here is the low radio (LoRa) signal applied at field level of hierarchical industrial systems. In this way combination of low energy protocol, in fieldbus, and open platform for monitoring and data acquisition, in high information level is achieved. An advantage here is related to the low energy protocol that is applied in industrial systems. In the created project a combination of LoRa and Open Grafana is main contribution of the work. Hence the article is useful for the upcoming Industry 4.0, which needs and uses such solutions. © 2020 IEEE.
34.
Ivanova, Y. N.; Ivanov, S. C.
LED Transmitter for Plastic Optical Fibers Conference
Institute of Electrical and Electronics Engineers Inc., 2020, ISBN: 9781728103624, (cited By 0).
Abstract | Links | BibTeX | Етикети: e, ee
@conference{Ivanova2020,
title = {LED Transmitter for Plastic Optical Fibers},
author = {Y. N. Ivanova and S. C. Ivanov},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85099583999\&doi=10.1109%2fEEAE49144.2020.9279074\&partnerID=40\&md5=95aaa119e0483c6eb6cdc7f43a8a03b6},
doi = {10.1109/EEAE49144.2020.9279074},
isbn = {9781728103624},
year = {2020},
date = {2020-01-01},
urldate = {2020-01-01},
journal = {2020 7th International Conference on Energy Efficiency and Agricultural Engineering, EE and AE 2020 - Proceedings},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
abstract = {Light emitting diodes (LED) are optical transmitters, radiating light in the visible range for plastic optical fibers and finding wide application in automation of technological processes both in industry and building automation. Optical signals are usually emitted by LEDs in the visible range by either laser diodes with lens or collimated lasers. This paper presents the results from experimental studies of a new scheme of an optical transmitter, using a LED, radiating light in the visible range. The aim of the conducted studies is to prove the possibility for transmitting numerical and analogue broad-band signals by using plastic optical fibers. Analysis of both the transient processes and the frequency properties of the transmitter have been made. An equivalent circuit of the optical transmitter, suitable for simulation studies, has been developed. The transient characteristics of the LED transmitter have been shown for operation in a pulse mode. By using an N-channel JFET to control the light emitting diode, connected in a common drain configuration, the r.m.s. value of the noise voltage at the output of the transmitter is reduced. This makes it applicable in systems for transmitting analogue data in addition to digital ones. The transmitter is compatible with the majority of data formats. It can be included as a final element in numerical interfaces for data communication through plastic optical fibers. The reliability of the transmitter in operation is increased by using a small number of elements. © 2020 IEEE.},
note = {cited By 0},
keywords = {e, ee},
pubstate = {published},
tppubtype = {conference}
}
Light emitting diodes (LED) are optical transmitters, radiating light in the visible range for plastic optical fibers and finding wide application in automation of technological processes both in industry and building automation. Optical signals are usually emitted by LEDs in the visible range by either laser diodes with lens or collimated lasers. This paper presents the results from experimental studies of a new scheme of an optical transmitter, using a LED, radiating light in the visible range. The aim of the conducted studies is to prove the possibility for transmitting numerical and analogue broad-band signals by using plastic optical fibers. Analysis of both the transient processes and the frequency properties of the transmitter have been made. An equivalent circuit of the optical transmitter, suitable for simulation studies, has been developed. The transient characteristics of the LED transmitter have been shown for operation in a pulse mode. By using an N-channel JFET to control the light emitting diode, connected in a common drain configuration, the r.m.s. value of the noise voltage at the output of the transmitter is reduced. This makes it applicable in systems for transmitting analogue data in addition to digital ones. The transmitter is compatible with the majority of data formats. It can be included as a final element in numerical interfaces for data communication through plastic optical fibers. The reliability of the transmitter in operation is increased by using a small number of elements. © 2020 IEEE.
35.
Ivanov, S. C.; Ivanova, Y. N.
Research of the Impact of the Active Driver Circuit with a dv/dt Feedback on the Speed of a DC Motor Conference
Institute of Electrical and Electronics Engineers Inc., 2020, ISBN: 9781728103624, (cited By 0).
Abstract | Links | BibTeX | Етикети: e, ee
@conference{Ivanov2020,
title = {Research of the Impact of the Active Driver Circuit with a dv/dt Feedback on the Speed of a DC Motor},
author = {S. C. Ivanov and Y. N. Ivanova},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85099549013\&doi=10.1109%2fEEAE49144.2020.9279016\&partnerID=40\&md5=e81f11c93647e6f7160d8d48c169695f},
doi = {10.1109/EEAE49144.2020.9279016},
isbn = {9781728103624},
year = {2020},
date = {2020-01-01},
urldate = {2020-01-01},
journal = {2020 7th International Conference on Energy Efficiency and Agricultural Engineering, EE and AE 2020 - Proceedings},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
abstract = {The main purpose of the present paper is to study the influence of an active driver with a feedback on the voltage derivative on both the speed and the average current value when performing pulse control of a DC motor. Studies with a conventional driver have also been carried out. A comparative analysis of the obtained experimental results has been made. An analysis of the harmonic composition of the voltage applied to the motor armature when controlling the motor by both the active and the conventional driver has been made. The change in the rotational speed of the motor, as well as in the average value of the current through the armature winding as a function of the pulse duty cycle has been studied experimentally. For comparison between the two drivers, oscillograms and results in tabular form are presented. © 2020 IEEE.},
note = {cited By 0},
keywords = {e, ee},
pubstate = {published},
tppubtype = {conference}
}
The main purpose of the present paper is to study the influence of an active driver with a feedback on the voltage derivative on both the speed and the average current value when performing pulse control of a DC motor. Studies with a conventional driver have also been carried out. A comparative analysis of the obtained experimental results has been made. An analysis of the harmonic composition of the voltage applied to the motor armature when controlling the motor by both the active and the conventional driver has been made. The change in the rotational speed of the motor, as well as in the average value of the current through the armature winding as a function of the pulse duty cycle has been studied experimentally. For comparison between the two drivers, oscillograms and results in tabular form are presented. © 2020 IEEE.
36.
Ivanov, S C; Ivanova, Y N
Reducing Energy Losses in Realising MOSFET Control by an Active du/dt Feedback Driver Conference
Institute of Electrical and Electronics Engineers Inc., 2020, ISBN: 9781728103624, (cited By 0).
Abstract | Links | BibTeX | Етикети: e, ee
@conference{Ivanov2020b,
title = {Reducing Energy Losses in Realising MOSFET Control by an Active du/dt Feedback Driver},
author = {S C Ivanov and Y N Ivanova},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85099539049\&doi=10.1109%2fEEAE49144.2020.9279094\&partnerID=40\&md5=25bd0f89a2349680c3101fea86e033bc},
doi = {10.1109/EEAE49144.2020.9279094},
isbn = {9781728103624},
year = {2020},
date = {2020-01-01},
journal = {2020 7th International Conference on Energy Efficiency and Agricultural Engineering, EE and AE 2020 - Proceedings},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
abstract = {The paper presents a method and a device for active control of power transistors, operating in a switch mode. The achieved goals are related to reduction of the dynamic energy losses when controlling the key elements. The driver circuitry limits the electromagnetic radiation, eliminates the need of using RC protection groups and increases the operational reliability of power transistors. An analytical model of the studied driver scheme has been made and results from the conducted experimental studies during the MOSFET control have been given. A comparison with a commonly used driver scheme has been drawn up. © 2020 IEEE.},
note = {cited By 0},
keywords = {e, ee},
pubstate = {published},
tppubtype = {conference}
}
The paper presents a method and a device for active control of power transistors, operating in a switch mode. The achieved goals are related to reduction of the dynamic energy losses when controlling the key elements. The driver circuitry limits the electromagnetic radiation, eliminates the need of using RC protection groups and increases the operational reliability of power transistors. An analytical model of the studied driver scheme has been made and results from the conducted experimental studies during the MOSFET control have been given. A comparison with a commonly used driver scheme has been drawn up. © 2020 IEEE.
37.
Ivanova, Y; Ivanov, S; Vasileva, E; Nyagolov, D
Control of impulse converter with reverse energy transmission with active driver circuit Conference
Institute of Electrical and Electronics Engineers Inc., 2020, ISBN: 9781728175317, (cited By 0).
Abstract | Links | BibTeX | Етикети: e, ee
@conference{Ivanova2020b,
title = {Control of impulse converter with reverse energy transmission with active driver circuit},
author = {Y Ivanova and S Ivanov and E Vasileva and D Nyagolov},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85099883323\&doi=10.1109%2fELECTRONICA50406.2020.9305097\&partnerID=40\&md5=57dadb2206fb3d6dc10bce3cb678c6b8},
doi = {10.1109/ELECTRONICA50406.2020.9305097},
isbn = {9781728175317},
year = {2020},
date = {2020-01-01},
journal = {11th National Conference with International Participation, ELECTRONICA 2020 - Proceedings},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
abstract = {This paper presents research of an active driver circuit with dv/dt feedback, included in the control system of a converter with reverse power transmission. A comparative analysis of the transients in the power circuit when controlling the power transistor with conventional and active driver is made. The impact of the active driver circuit on the frequency and attenuation of the resonant processes during the switching of the power transistor has been researched. Conclusions are made about the power losses, the amplitude values of the voltages and the electromagnetic radiation of the converter. © 2020 IEEE.},
note = {cited By 0},
keywords = {e, ee},
pubstate = {published},
tppubtype = {conference}
}
This paper presents research of an active driver circuit with dv/dt feedback, included in the control system of a converter with reverse power transmission. A comparative analysis of the transients in the power circuit when controlling the power transistor with conventional and active driver is made. The impact of the active driver circuit on the frequency and attenuation of the resonant processes during the switching of the power transistor has been researched. Conclusions are made about the power losses, the amplitude values of the voltages and the electromagnetic radiation of the converter. © 2020 IEEE.
38.
Petrov, B B
Institute of Electrical and Electronics Engineers Inc., 2020, ISBN: 9781728187174, (cited By 0).
Abstract | Links | BibTeX | Етикети: e
@conference{Petrov202082,
title = {Using of Bfloat16 Format in Deep Learning Embedded Accelerators based on FPGA with Limited Quantity of Dedicated Multipliers},
author = {B B Petrov},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85099462094\&doi=10.1109%2fTELECOM50385.2020.9299565\&partnerID=40\&md5=d336c217147b423dc5f7d1fa57e0d589},
doi = {10.1109/TELECOM50385.2020.9299565},
isbn = {9781728187174},
year = {2020},
date = {2020-01-01},
journal = {28th National Conference with International Participation, TELECOM 2020 - Proceedings},
pages = {82-85},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
abstract = {The hardware base of Deep Learning Neural Network (DLNN) realization methods are remote cloud services, Graphical Processing Units (GPU) and Field Programmable Gate Arrays (FPGA). The one of the main differences between FPGA devices is important for DLNN realization is quantity of dedicated multipliers in DSP blocks. In this article a method for optimization based on bfloat16 data format useful for FPGA devices with small quantities of DSP blocks is described. © 2020 IEEE.},
note = {cited By 0},
keywords = {e},
pubstate = {published},
tppubtype = {conference}
}
The hardware base of Deep Learning Neural Network (DLNN) realization methods are remote cloud services, Graphical Processing Units (GPU) and Field Programmable Gate Arrays (FPGA). The one of the main differences between FPGA devices is important for DLNN realization is quantity of dedicated multipliers in DSP blocks. In this article a method for optimization based on bfloat16 data format useful for FPGA devices with small quantities of DSP blocks is described. © 2020 IEEE.
39.
Petrov, B B
Using of Integrated Daemon Module for Internal Processing Cells Addressing in Systolic Architecture Conference
Institute of Electrical and Electronics Engineers Inc., 2020, ISBN: 9781728174266, (cited By 0).
Abstract | Links | BibTeX | Етикети: e
@conference{Petrov2020c,
title = {Using of Integrated Daemon Module for Internal Processing Cells Addressing in Systolic Architecture},
author = {B B Petrov},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85097041022\&doi=10.1109%2fET50336.2020.9238281\&partnerID=40\&md5=eac6befd2f9ee6124a0fb693a96c8963},
doi = {10.1109/ET50336.2020.9238281},
isbn = {9781728174266},
year = {2020},
date = {2020-01-01},
journal = {2020 29th International Scientific Conference Electronics, ET 2020 - Proceedings},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
abstract = {FPGA programmable logic devices make it possible to implement known and synthesize new architectures with many applications. Increasingly, these implementations are based on systolic array that combine very good capabilities and features. The article discusses a method for shortening additional resource for change of a specific parametric value in a given computing element of the systolic architecture by embedding a small single-register module in each cell. © 2020 IEEE.},
note = {cited By 0},
keywords = {e},
pubstate = {published},
tppubtype = {conference}
}
FPGA programmable logic devices make it possible to implement known and synthesize new architectures with many applications. Increasingly, these implementations are based on systolic array that combine very good capabilities and features. The article discusses a method for shortening additional resource for change of a specific parametric value in a given computing element of the systolic architecture by embedding a small single-register module in each cell. © 2020 IEEE.
40.
Yakimov, P I; Asparuhova, K K; Grigorova, T G; Shehova, D A
Industry 4.0 and the Challenges Faced by STEM Education Conference
Institute of Electrical and Electronics Engineers Inc., 2020, ISBN: 9781728174266, (cited By 0).
Abstract | Links | BibTeX | Етикети: e
@conference{Yakimov2020,
title = {Industry 4.0 and the Challenges Faced by STEM Education},
author = {P I Yakimov and K K Asparuhova and T G Grigorova and D A Shehova},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85097051210\&doi=10.1109%2fET50336.2020.9238223\&partnerID=40\&md5=71ab25c881f4a10b43e47bfa9b6f83a6},
doi = {10.1109/ET50336.2020.9238223},
isbn = {9781728174266},
year = {2020},
date = {2020-01-01},
journal = {2020 29th International Scientific Conference Electronics, ET 2020 - Proceedings},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
abstract = {The paper surveys the main factors supporting the implementation of the paradigm Industry 4.0. Their basic characteristics which represent challenges in front of the STEM education are considered. Some tasks faced by the industrial automation engineers are taken into account. A possible correspondence between the required skills and the taught subjects is presented. © 2020 IEEE.},
note = {cited By 0},
keywords = {e},
pubstate = {published},
tppubtype = {conference}
}
The paper surveys the main factors supporting the implementation of the paradigm Industry 4.0. Their basic characteristics which represent challenges in front of the STEM education are considered. Some tasks faced by the industrial automation engineers are taken into account. A possible correspondence between the required skills and the taught subjects is presented. © 2020 IEEE.