TY  - CONF
AU  - Radulović, Katarina
AU  - Radovanović, Filip
AU  - Ranđelović, Danijela
AU  - Jović, Vesna
AU  - Lamovec, Jelena
AU  - Vasiljević Radović, Dana
AU  - Jakšić, Zoran
PY  - 2015
UR  - https://dais.sanu.ac.rs/123456789/787
AB  - Properties of sintered NdFeB magnets strongly depend on granulation and size distribution of constituent particles, which requires an efficient method for their separation into relatively narrow size fractions. We investigated two methods of magnetic particle separation from a mixture with different sizes using simulation by finite element method: magnetophoresis and gravity settling. In the case of magnetophoresis magnetic particles ranging in diameter from 1 to 10 m were deflected from the direction of continuous laminar flow by a perpendicular magnetic field. Larger particles were deflected from the direction of laminar flow more than smaller particles. The applied flow rate and strength and gradient of the applied magnetic field were the key parameters in controlling the deflection. The gravity settling model simulated spherical particles falling in heptane. Particles of various sizes were divided according to the time they needed to reach the bottom. The model used an axially symmetric fluid-flow simulation in a moving coordinate system connected with the particle, coupled with an ordinary differential equation for the force balance of the particle (gravity and drag force). The grain accelerated from standstill and rapidly reached its terminal velocity. This velocity was approximately proportional to the square of the particle radius, which led to clear separation of 5-10 um particles from those with a diameter of 1 um.
PB  - Belgrade : ETRAN Society
C3  - 59. Konferencija za elektroniku, telekomunikacije, računarstvo, automatiku i nuklearnu tehniku, Srebrno jezero, 8-11. juna, 2015. godine [i] 2nd International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2015 Silver Lake (Srebrno jezero), Serbia, June 8-11, 2015: Proceedings
T1  - Modelling the size separation of NdFeB magnetic microparticles by magnetophoresis and gravity settling
UR  - https://hdl.handle.net/21.15107/rcub_dais_787
ER  - 

@conference{
author = "Radulović, Katarina and Radovanović, Filip and Ranđelović, Danijela and Jović, Vesna and Lamovec, Jelena and Vasiljević Radović, Dana and Jakšić, Zoran",
year = "2015",
abstract = "Properties of sintered NdFeB magnets strongly depend on granulation and size distribution of constituent particles, which requires an efficient method for their separation into relatively narrow size fractions. We investigated two methods of magnetic particle separation from a mixture with different sizes using simulation by finite element method: magnetophoresis and gravity settling. In the case of magnetophoresis magnetic particles ranging in diameter from 1 to 10 m were deflected from the direction of continuous laminar flow by a perpendicular magnetic field. Larger particles were deflected from the direction of laminar flow more than smaller particles. The applied flow rate and strength and gradient of the applied magnetic field were the key parameters in controlling the deflection. The gravity settling model simulated spherical particles falling in heptane. Particles of various sizes were divided according to the time they needed to reach the bottom. The model used an axially symmetric fluid-flow simulation in a moving coordinate system connected with the particle, coupled with an ordinary differential equation for the force balance of the particle (gravity and drag force). The grain accelerated from standstill and rapidly reached its terminal velocity. This velocity was approximately proportional to the square of the particle radius, which led to clear separation of 5-10 um particles from those with a diameter of 1 um.",
publisher = "Belgrade : ETRAN Society",
journal = "59. Konferencija za elektroniku, telekomunikacije, računarstvo, automatiku i nuklearnu tehniku, Srebrno jezero, 8-11. juna, 2015. godine [i] 2nd International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2015 Silver Lake (Srebrno jezero), Serbia, June 8-11, 2015: Proceedings",
title = "Modelling the size separation of NdFeB magnetic microparticles by magnetophoresis and gravity settling",
url = "https://hdl.handle.net/21.15107/rcub_dais_787"
}

Radulović, K., Radovanović, F., Ranđelović, D., Jović, V., Lamovec, J., Vasiljević Radović, D.,& Jakšić, Z.. (2015). Modelling the size separation of NdFeB magnetic microparticles by magnetophoresis and gravity settling. in 59. Konferencija za elektroniku, telekomunikacije, računarstvo, automatiku i nuklearnu tehniku, Srebrno jezero, 8-11. juna, 2015. godine [i] 2nd International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2015 Silver Lake (Srebrno jezero), Serbia, June 8-11, 2015: Proceedings
Belgrade : ETRAN Society..
https://hdl.handle.net/21.15107/rcub_dais_787

Radulović K, Radovanović F, Ranđelović D, Jović V, Lamovec J, Vasiljević Radović D, Jakšić Z. Modelling the size separation of NdFeB magnetic microparticles by magnetophoresis and gravity settling. in 59. Konferencija za elektroniku, telekomunikacije, računarstvo, automatiku i nuklearnu tehniku, Srebrno jezero, 8-11. juna, 2015. godine [i] 2nd International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2015 Silver Lake (Srebrno jezero), Serbia, June 8-11, 2015: Proceedings. 2015;.
https://hdl.handle.net/21.15107/rcub_dais_787 .

Radulović, Katarina, Radovanović, Filip, Ranđelović, Danijela, Jović, Vesna, Lamovec, Jelena, Vasiljević Radović, Dana, Jakšić, Zoran, "Modelling the size separation of NdFeB magnetic microparticles by magnetophoresis and gravity settling" in 59. Konferencija za elektroniku, telekomunikacije, računarstvo, automatiku i nuklearnu tehniku, Srebrno jezero, 8-11. juna, 2015. godine [i] 2nd International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2015 Silver Lake (Srebrno jezero), Serbia, June 8-11, 2015: Proceedings (2015),
https://hdl.handle.net/21.15107/rcub_dais_787 .

TY  - CONF
AU  - Lamovec, Jelena
AU  - Jović, Vesna
AU  - Radovanović, Filip
AU  - Ranđelović, Danijela
AU  - Radulović, Katarina
AU  - Jakšić, Zoran
AU  - Vasiljević Radović, Dana
PY  - 2015
UR  - https://dais.sanu.ac.rs/123456789/804
AB  - Improved permanent magnets are essential for emergent applications in electronic and electric devices. Different attempts have been made to produce nanoscale anisotropic rare-earth magnetic powder based on Nd-Fe-B material. Recently, high energy surfactant assisted ball milling has been proven to be an effective technique to produce anisotropic hard magnetic Nd-Fe-B nanoparticles. In this paper we are presenting our experimental results on high energy ball milling in planetary mill "Puverisette 7 premium line" from "Fritsch". Except milling material, there are several variables which influence the milling process for the selected mill type. They are: mechanical properties of the milling media material (bowls, balls, etc.), ball-to-powder ratio (BPR), extent of filling of the milling bowl, milling atmosphere, milling speed and duration, and type of solution and surfactant for wet milling. We are going to give influence of all these parameters on obtained NdFeB magnetic materials with nanosized dimensions starting from Nd2Fe14B HDD (Hydrogenated Disproportionated Desorbed) material. 

Acknowledgements: This work is funded by FP7 project MAG-DRIVE: "New permanent magnets for electric-vehicle drive applications", grant agreement no: 605348.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Seventeenth Annual Conference YUCOMAT 2015, Aug 31-Sep 04, 2015, Herceg Novi, Montenegro, Programme and the Book of Abstracts
T1  - Preparation of NdFeB Magnetic Nanoparticles by Surfactant-Assisted High Energy Ball Milling
SP  - 66
EP  - 66
UR  - https://hdl.handle.net/21.15107/rcub_dais_804
ER  - 

@conference{
author = "Lamovec, Jelena and Jović, Vesna and Radovanović, Filip and Ranđelović, Danijela and Radulović, Katarina and Jakšić, Zoran and Vasiljević Radović, Dana",
year = "2015",
abstract = "Improved permanent magnets are essential for emergent applications in electronic and electric devices. Different attempts have been made to produce nanoscale anisotropic rare-earth magnetic powder based on Nd-Fe-B material. Recently, high energy surfactant assisted ball milling has been proven to be an effective technique to produce anisotropic hard magnetic Nd-Fe-B nanoparticles. In this paper we are presenting our experimental results on high energy ball milling in planetary mill "Puverisette 7 premium line" from "Fritsch". Except milling material, there are several variables which influence the milling process for the selected mill type. They are: mechanical properties of the milling media material (bowls, balls, etc.), ball-to-powder ratio (BPR), extent of filling of the milling bowl, milling atmosphere, milling speed and duration, and type of solution and surfactant for wet milling. We are going to give influence of all these parameters on obtained NdFeB magnetic materials with nanosized dimensions starting from Nd2Fe14B HDD (Hydrogenated Disproportionated Desorbed) material. 

Acknowledgements: This work is funded by FP7 project MAG-DRIVE: "New permanent magnets for electric-vehicle drive applications", grant agreement no: 605348.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Seventeenth Annual Conference YUCOMAT 2015, Aug 31-Sep 04, 2015, Herceg Novi, Montenegro, Programme and the Book of Abstracts",
title = "Preparation of NdFeB Magnetic Nanoparticles by Surfactant-Assisted High Energy Ball Milling",
pages = "66-66",
url = "https://hdl.handle.net/21.15107/rcub_dais_804"
}

Lamovec, J., Jović, V., Radovanović, F., Ranđelović, D., Radulović, K., Jakšić, Z.,& Vasiljević Radović, D.. (2015). Preparation of NdFeB Magnetic Nanoparticles by Surfactant-Assisted High Energy Ball Milling. in Seventeenth Annual Conference YUCOMAT 2015, Aug 31-Sep 04, 2015, Herceg Novi, Montenegro, Programme and the Book of Abstracts
Belgrade : Materials Research Society of Serbia., 66-66.
https://hdl.handle.net/21.15107/rcub_dais_804

Lamovec J, Jović V, Radovanović F, Ranđelović D, Radulović K, Jakšić Z, Vasiljević Radović D. Preparation of NdFeB Magnetic Nanoparticles by Surfactant-Assisted High Energy Ball Milling. in Seventeenth Annual Conference YUCOMAT 2015, Aug 31-Sep 04, 2015, Herceg Novi, Montenegro, Programme and the Book of Abstracts. 2015;:66-66.
https://hdl.handle.net/21.15107/rcub_dais_804 .

Lamovec, Jelena, Jović, Vesna, Radovanović, Filip, Ranđelović, Danijela, Radulović, Katarina, Jakšić, Zoran, Vasiljević Radović, Dana, "Preparation of NdFeB Magnetic Nanoparticles by Surfactant-Assisted High Energy Ball Milling" in Seventeenth Annual Conference YUCOMAT 2015, Aug 31-Sep 04, 2015, Herceg Novi, Montenegro, Programme and the Book of Abstracts (2015):66-66,
https://hdl.handle.net/21.15107/rcub_dais_804 .

TY  - CONF
AU  - Jakšić, Olga
AU  - Tanasković, Dragan
AU  - Ranđelović, Danijela
AU  - Radovanović, Filip
PY  - 2014
UR  - https://dais.sanu.ac.rs/123456789/786
AB  - Data tracking and hacking is especially dangerous in modern defence forces where classified data transmission must envolve cryptographic methods for secure and reliable data coding. The more unpredictable the cipher is, the more reliable is the message. Hardware random number generator or true random number generator (TRNG) is crucial part for every telecommunication system that involves secure and confidential electronic data transfer (official state agencies, e-banking, military data networks…) because it generates random numbers from a physical process which provides statistically random noise signals, which are trully unpredictable contrary to pseudo-random number generators generated by various software algorithms. A typical hardware random noise generators employs transducer to convert random physical process (thermal noise, photoelectric effect or other quantum phenomena) to electrical signal, amplifiers and AD convertors. On the other hand, pseudo-random number generation based on methods and algorithms may be examined by statistical tests for randomnes and proove if it is cryptographically secure. We analyze the possibility to implement adsorption-based sensors noise for the creation of allgorithm for pseudo-random number generaton and also the possibility of adsorption-based hardware random generator.
PB  - Belgrade : Military Technical Institute
C3  - 6th International Scientific Conference on Defensive Technologies, OTEH 2014, Belgrade, 09-10 October 2014: Proceedings
T1  - Adsorption–desorption based random number generator
SP  - 617
EP  - 622
UR  - https://hdl.handle.net/21.15107/rcub_dais_786
ER  - 

@conference{
author = "Jakšić, Olga and Tanasković, Dragan and Ranđelović, Danijela and Radovanović, Filip",
year = "2014",
abstract = "Data tracking and hacking is especially dangerous in modern defence forces where classified data transmission must envolve cryptographic methods for secure and reliable data coding. The more unpredictable the cipher is, the more reliable is the message. Hardware random number generator or true random number generator (TRNG) is crucial part for every telecommunication system that involves secure and confidential electronic data transfer (official state agencies, e-banking, military data networks…) because it generates random numbers from a physical process which provides statistically random noise signals, which are trully unpredictable contrary to pseudo-random number generators generated by various software algorithms. A typical hardware random noise generators employs transducer to convert random physical process (thermal noise, photoelectric effect or other quantum phenomena) to electrical signal, amplifiers and AD convertors. On the other hand, pseudo-random number generation based on methods and algorithms may be examined by statistical tests for randomnes and proove if it is cryptographically secure. We analyze the possibility to implement adsorption-based sensors noise for the creation of allgorithm for pseudo-random number generaton and also the possibility of adsorption-based hardware random generator.",
publisher = "Belgrade : Military Technical Institute",
journal = "6th International Scientific Conference on Defensive Technologies, OTEH 2014, Belgrade, 09-10 October 2014: Proceedings",
title = "Adsorption–desorption based random number generator",
pages = "617-622",
url = "https://hdl.handle.net/21.15107/rcub_dais_786"
}

Jakšić, O., Tanasković, D., Ranđelović, D.,& Radovanović, F.. (2014). Adsorption–desorption based random number generator. in 6th International Scientific Conference on Defensive Technologies, OTEH 2014, Belgrade, 09-10 October 2014: Proceedings
Belgrade : Military Technical Institute., 617-622.
https://hdl.handle.net/21.15107/rcub_dais_786

Jakšić O, Tanasković D, Ranđelović D, Radovanović F. Adsorption–desorption based random number generator. in 6th International Scientific Conference on Defensive Technologies, OTEH 2014, Belgrade, 09-10 October 2014: Proceedings. 2014;:617-622.
https://hdl.handle.net/21.15107/rcub_dais_786 .

Jakšić, Olga, Tanasković, Dragan, Ranđelović, Danijela, Radovanović, Filip, "Adsorption–desorption based random number generator" in 6th International Scientific Conference on Defensive Technologies, OTEH 2014, Belgrade, 09-10 October 2014: Proceedings (2014):617-622,
https://hdl.handle.net/21.15107/rcub_dais_786 .