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1.
The external bias-dependent electric field at hole-injecting electrode/[alpha]-NPD junction and its relationship to Gaussian disordered interface states
Bruno Cvikl, 2019, izvirni znanstveni članek

Opis: An alternative interpretation of two different sets of published temperature-dependent current-voltage a-NPD (i.e. N,N'-Di(1-naphthyl)-N,N'-diphenyl-(1,11-biphenyl)-4,4'-diamine) organic semiconductor data is presented. The measurements are described in terms of the hole drift current density expressed with two parameters: the electric field at the hole-injecting interface, Eint, and, ?max, the hole mobility determined by the measured current density at the maximum value of the externally applied electric field, Ea, in a given experiment. The former parameter, depending on the contact résistance, may be a function of Ea but the latter is Ea independent, The fixed value of Eint signifies the occurrence of the space charge limited current, SCLC, within the electrode/a-NPD structures and the contact is ohmic. Then, the calculated weak bias-dependent hole drift mobility, a function of Eint, equals the well%known exponential bias-dependent mobility, and saturates. The data not displaying SCLC characteristics are used for the calculation of Eint dependence on the applied field, Ea. It is shown that the quasi-ohmic contacts cause Eint to become a strong double-valued function of the externally applied electric field, Ea, described in terms of the distorted, inverted, high order parabola. The corresponding bias-dependent hole drift mobility is non-exponential and evolves on a considerably lower level than in SCLC cases. It is found that a sufficiently increased Ea alters the quasi-ohmic contact/a-NPD region into the ohmic one. A simple model of a thin, net hole charged, electrode/a-NPD interface enables the relationship between the deduced interfacial electric field, Eint, and the Ea dependent Gaussian width, as well as the energy shift of its peak along the negative binding energy is to be investigated. The currentvoltage method appears to be a helpful expedient for the investigation of the electric field at hole-injecting electrode/organic interfaces.
Ključne besede: electrode/organic electric field, contact affected hole mobility, organic interface disorder parameters
Objavljeno v DKUM: 22.12.2023; Ogledov: 457; Prenosov: 6
.pdf Celotno besedilo (1004,22 KB)
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2.
Electric and magnetic field measurements for high voltage transmission lines : the case of Turkey
Mehmet Zeki Çelik, Mehmet Murat Ispirli, Yusuf Öner, Bülent Oral, 2019, strokovni članek

Opis: A power system is a facility that creates low-frequency electromagnetic fields (EMF) with its highvoltage level and high electric current capacity. In this respect, these electromagnetic fields need to be significantly evaluated from the aspects of both those who are exposed to the fields due to the structure of the facility during their daily lives and those who are exposed to the fields due to their occupation. In this study, the transmission lines and substations in the power system of Turkey are evaluated on account of electric and magnetic field measurements. Firstly, the people living in general public zones near the transmission line or substation were examined. In another part of the study, measurements were made in the occupational exposure of the staff in the energy zone. The results obtained from measurements are compared with the limit values provided by the International Commission on Non%Ionizing Radiation Protection (ICNIRP). The measurements were performed by NARDA EFA-300 electromagnetic field measurement. The closest point to the ground was determined as the reference point for the measurements performed on transmission lines. The results for different distances were obtained by performing measurements following those reference points with fixed distances.
Ključne besede: electric field, ELF, electromagnetic filed, ICNIRP, magnetic field
Objavljeno v DKUM: 05.12.2023; Ogledov: 332; Prenosov: 5
.pdf Celotno besedilo (609,08 KB)
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3.
Assessment of human exposure to electric and magnetic fields near transmission lines using FEMM
Bojan Glushica, Blagoja Markovski, Andrijana Kuhar, Vesna Arnautovski Toseva, 2023, izvirni znanstveni članek

Opis: The intensity of ELF electric and magnetic fields near transmission lines is of particular interest in environmental and equipment protection studies. The use of numerical tools is the most efficient method for their assessment. In this paper, we numerically compute the electric and magnetic fields near different configurations of high-voltage transmission lines using the open- source software FEMM 4.2. Computed fields are compared with reference levels related to human exposure to electromagnetic fields. The accuracy of the applied method is validated with published, numerically computed and measured results.
Ključne besede: finite elements method, transmission lines, electric field, magnetic field, electromagnetic computation
Objavljeno v DKUM: 11.10.2023; Ogledov: 407; Prenosov: 6
.pdf Celotno besedilo (983,05 KB)
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4.
Finite size effects in soft matter under an electric field stimulus
Saša Harkai, 2016, magistrsko delo

Opis: In this thesis, we study the effect of an external electric field on the properties of glass forming liquids. We present the properties relevant and important for understanding the phenomenon, such as the transition temperature and the temperature dependence of viscosity. We create a numerical model and use a method called molecular dynamics with the Lennard-Jones potential and an added external field as the interatomic potential to simulate molecular motion within a glass forming liquid. We implement analysis methods to calculate properties such as the radial distribution function, static structure factor, diffusion coefficient, non-Gaussian parameter, and relaxation time. We use the implemented methods to evaluate the molecular behaviour of the simulation and compare the results with theoretical predictions.
Ključne besede: finite size, glass transition, diffusion constant, dynamic heterogeneity, electric field
Objavljeno v DKUM: 21.09.2016; Ogledov: 1410; Prenosov: 117
.pdf Celotno besedilo (1,38 MB)

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