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Wyświetlanie 1-15 z 92
Tytuł:
The influence of environmental factors on metabolic activity of cancer cells
Autorzy:
KOZIOROWSKA, ANNA
STATS, KATARZYNA
ROMEROWICZ-MISIELAK, MARIA
Powiązania:
https://bibliotekanauki.pl/articles/457987.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Rzeszowski
Tematy:
cells viability
Electromagnetic field
Opis:
The paper presents the results of viability of breast cancer cells under the influence of electromagnetic field. MCF-7 cell line was subjected to an electromagnetic field with a frequency of 5 Hz, 60 Hz and 120 Hz and an MTT assay was performed immediately after the influence of the field and after 24 hours. No statistical difference was demonstrated in cell viability immediately after exposure to EMF, and there are demonstrated differences in the case of field frequencies of 5 Hz and 120 Hz within 24 hours after exposure.
Źródło:
Edukacja-Technika-Informatyka; 2016, 7, 2; 306-315
2080-9069
Pojawia się w:
Edukacja-Technika-Informatyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Classical Approach of Unified Field
Autorzy:
Das, M. CH.
Misra, R.
Powiązania:
https://bibliotekanauki.pl/articles/411543.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
electromagnetic field
gravitational field
photon
unified field
Opis:
Photons contribute electromagnetic field that accompanies the gravitational field. These two fields may be, mutually, transformed through a kind of transformation matrix dependent upon the boundary conditions of the system. In this work trial would be made to find the nature of this transformation matrix considering a super system of photon in which both fields are unified. The unification of electromagnetic and gravitational fields leads to the concept of fundamental charge.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 7, 2; 73-84
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of DC permanent magnet disc motor and improving its EMC
Autorzy:
Kovacova, I.
Kanuch, J.
Kovac, D.
Powiązania:
https://bibliotekanauki.pl/articles/262741.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
electromagnetic compatibility
disc motor
electromagnetic field radiation
Opis:
The paper deals with construction design of DC permanent magnet disc motor by classical calculation method and its verifying by computer finite element simulation method. The paper deals also with the computer analysis of the electromagnetic compatibility (EMC) problems focused to the area of electrical machines, which can also disclose the startling facts concerning. A problem of interference between electric motor and surroundings space caused by electromagnetic field radiation is discussed too.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2005, 11, 2; 23-39
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Electromagnetic Field in the Vicinity of Radio-navigation Systems
Autorzy:
Jóźwiak-Michałowska, N.
Felski, A.
Powiązania:
https://bibliotekanauki.pl/articles/320430.pdf
Data publikacji:
2018
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
electromagnetic field
risk
DGPS
AIS
Opis:
Today, electromagnetic waves are the basic medium for all communication tasks. This applies also to navigation, where the most commonly waves have lengths measured in centimetres (radar, GPS) and longer, such as the waves used in the AIS or DGPS technologies. Navigators are mostly interested in the communication functionality of the used systems, i.e. such factors as range of the system and signal-to-noise ratio. This leads directly to increasing the transmitters' power. However, it is important to bear in mind that the electromagnetic field can endanger human health, therefore, establishing the level of radiation both on vessels and near the shore transmitters is crucial in this context. The experience of authors shows that the knowledge of the most of navigators hereupon is not large. From this result extremely irresponsible behaviors of one persons, as well as inexplicable phobias others. This article presents the subject using the example of the electromagnetic field present near a lighthouse emitting AIS and DGPS signals. Relevant measurements were made at the Rozewie lighthouse by certified laboratory of Maritime Institute in Gdansk according the polish standards and internal, certified procedures. Results of the measurements were related to the national and European standards for electromagnetic field measurements in the context of occupational health and safety.
Obecnie fale elektromagnetyczne stanowią podstawowe medium komunikacyjne. Stosowane są również w nawigacji, przy czym najczęściej dotyczy to fal centymetrowych (radar i GPS) i dłuższych, na przykład stosowanych w systemach AIS i DGPS. W przypadku nawigacji zwracamy szczególną uwagę na funkcje komunikacyjne, czyli na takie czynniki jak zasięg systemu i stosunek sygnału do szumu. To prowadzi wprost do zwiększania mocy nadajników. Jednakże nie można zapomina o tym, że pole elektromagnetyczne może negatywnie wpływać na ludzkie zdrowie, a więc ustalenie poziomu tego pola, tak na statku jak i w pobliżu instalacji lądowych ma istotne znaczenie. Doświadczenie autorów wskazuje, że wiedza o tych aspektach jest wśród nawigatorów niewielka, co skutkuje niejednokrotnie zachowaniami ryzykownymi jak i nieuzasadnionymi fobiami. W artykule opisano charakterystykę pola elektromagnetycznego występującego na latarni morskiej emitującej sygnały AIS oraz DGPS na podstawie pomiarów wykonanych przez certyfikowane laboratorium Instytutu Morskiego w Gdańsku, z odniesieniem do przepisów oraz norm krajowych i unijnych.
Źródło:
Annual of Navigation; 2018, 25; 109-124
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lorentz Transformation in Super System and in Super System of Photon
Autorzy:
Das, M. C.
Misra, R.
Powiązania:
https://bibliotekanauki.pl/articles/412190.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Lorentz transformation
electromagnetic field
gravitational field
photon
Opis:
Lorentz transformation considers that relative velocity of the frame of references in inertial system is less than the velocity of light. If it be such that a frame is moving with velocity same as that of light with respect to a frame of observer then, Lorentz transformation in it will not be same as done in inertial system. Again photon is not only a particle or wave but it is a complex system due to the fact that it possesses spin and linear motion simultaneously. So, it will have some complex characteristics. In this work first, trial would be made to find out the process of Lorentz transformation in between two frames having relative velocity same as that of light and then, this concept, would be applied in the system of photon.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 19, 1; 8-14
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of the magnetostrictive actuator transients
Autorzy:
Idziak, P.
Kowalski, K.
Nowak, L.
Barlak, M.
Pochrybniak, C.
Powiązania:
https://bibliotekanauki.pl/articles/377166.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
actuators
magnetostriction
electromagnetic field
transient analysis
Opis:
The paper deals with a magnetostrictive fast-acting actuator applied as a driving device for plasma valve. The actuator is characterized by a relatively small displacement (les then 0.1 mm), but with a very short response time – below 0.1 ms. System is designed for so called “high intensity plasma pulses gun” which is applied in the area of plasma physics and material engineering [1]. A structure with an axisymmetrical actuator energised by discharged pulses of a capacitor has been proposed. The field-circuit mathematical model of the dynamic operation of the actuator has been applied. The model includes: the equation of transient electromagnetic field in a non-linear ferromagnetic material and equation of electric circuit. Using the Borland Delphi 9.0 environment, the computer software has been elaborated. Results of simulation are presented.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2015, 83; 23-30
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Space-Time Geometry of Electromagnetic Field in the System of Photon
Autorzy:
Das, M. CH.
Misra, R.
Powiązania:
https://bibliotekanauki.pl/articles/412284.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
space-time geometry
unified field
electromagnetic field
Opis:
In the concept of general relativity gravity is the space-time geometry. Again, a relation between electromagnetic field and gravitational field is expected. In this paper, space-time geometry of electromagnetic field in the system of photon has been introduced to unify electromagnetic field and gravitational field in flat and curvature space-time.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 9, 1; 13-16
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electromagnetic Field Generated by Wireless Alarm Devices
Autorzy:
Pospisilik, M.
Vnencakova, E.
Powiązania:
https://bibliotekanauki.pl/articles/963854.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wireless communication
power density
electromagnetic field
Opis:
Together with the rise of importance of devices employing wireless networks based on the principle of radio frequency data transfers, also the discussion on harmfulness of the electromagnetic radiation has occurred. The authors of this paper obviously cannot provide unambiguous answers to stop this discussion. On the other way, they can provide the reader of this paper with real data obtained by measurements processed inside a semi anechoic chamber that were performed at several wireless alarm peripherals. The measured values are compared to the technical and hygienic standards so the reader can form an idea of the amount of the radiated energy. Moreover, examples of waterfall diagrams of spectra generated by the devices are also listed in this paper.
Źródło:
International Journal of Electronics and Telecommunications; 2018, 64, 1; 57-64
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical solution for certain nonlinear electromagnetic field problems
Autorzy:
Sowa, M.
Spałek, D.
Powiązania:
https://bibliotekanauki.pl/articles/377744.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
electromagnetic field
analytical solution
nonlinear analysis
Opis:
The paper presents a nonlinear electromagnetic field problem with cylindrical symmetry. A time-sinusoidal boundary condition is applied, which yields non-sinusoidal steady-state fields. The problem is brought forth to test an analytical-numerical method based on the method of small parameter. A distinctive feature of this method is that it requires symbolic calculations to be performed. These allow to reduce the problem to a system of nonlinear equations. In order to check the accuracy of the solution, several error criteria are introduced. Moreover, the power balance of a nonlinear conductive region is verified.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 69; 49-56
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetohydrodynamic Calculation on Double-Loop Channel Induction Tundish
Autorzy:
Yue, Q.
Pei, X.
Zhang, C.
Wang, X.
Powiązania:
https://bibliotekanauki.pl/articles/350969.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
induction heating
electromagnetic field
channel
tundish
Opis:
A mathematical model is developed to investigate the electromagnetic induction heating in a continuous casting tundish with the double-loop inductor. Maxwell’s equations are solved using finite element method to obtain the magnetic flux density, electromagnetic force, and Joule heating. Results show that the induced current through the two channels generates a current loop. The electromagnetic force points to the center of the channel, thus generating a pinch effect on the molten steel. With the skin effect and proximity effect, Joule heating rate reaches its maximum and minimum values at the corners and the center of the crosssection area respectively. Power ampere-turn has a significant influence on the electromagnetic force and Joule heating density. As ampere-turns vary from 3.6×104 to 2.16×105, Joule heating rate increases from 2.4 MW m-3 to 85 MW m-3. Electromagnetic force also increases from 8×104 N m-3 to 3×106 N m-3 in the center axis line of the channel. The present work reveals the relationship between magnetic flux density and electromagnetic force. The results will be helpful in adjusting the electromagnetic field in channel-induction furnaces and modifying the design of channel parameters.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 329-336
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the power losses in the three-phase high-current busducts
Autorzy:
Szczegielniak, T.
Piątek, Z.
Kusiak, D.
Powiązania:
https://bibliotekanauki.pl/articles/97329.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
high-current busduct
power losses
electromagnetic field
Opis:
This paper presents an analytical method for determining the power losses in the three-phase gas-insulated transmission line (i.e., high-current busduct) of circular cross-section geometry. The mathematical model takes into account the skin effect and the proximity effects, as well as the complete electromagnetic coupling between phase conductors and enclosures (i.e., screens). Apart from analytical calculation, computer simulations for high-current busduct system power losses were also performed with the aid of the commercial FEMM software, using two-dimensional finite elements.
Źródło:
Computer Applications in Electrical Engineering; 2015, 13; 21-27
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power losses in the three-phase gas-insulated line
Autorzy:
Szczegielniak, T.
Kusiak, D.
Piątek, Z.
Powiązania:
https://bibliotekanauki.pl/articles/376150.pdf
Data publikacji:
2017
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
high-current busduct
electromagnetic field
power losses
Opis:
This paper presents an analytical method for determining the power losses in the three–phase gas–insulated line (i.e., high-current busduct) of circular cross–section geometry which phase conductors are placed in vertex of a square. The mathematical model takes into account the skin effect and the proximity effects, as well as the complete electromagnetic coupling between phase conductors and enclosures (i.e., screens). The power losses produced by high-current busducts are usually calculated numerically with the use of a computer. However, the analytical calculation of the power losses is preferable, because it results in a mathematical expression for showing its dependences on various parameters of the line arrangement. Moreover, knowledge of the relations between electrodynamics and constructional parameters is necessary in the optimization construction process of the high-current busducts.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2017, 89; 89-98
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control of the crack trajectory by the electromagnetic field in media with embedded actuators
Autorzy:
Miklashevich, I.
Powiązania:
https://bibliotekanauki.pl/articles/386416.pdf
Data publikacji:
2008
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
pękanie
aktuator
pole elektromagnetyczne
crack
actuators
electromagnetic field
Opis:
The variation principle is applied for defining a crack in the solid body. Crack propagation in non-homogeneous media has been considered. It is shown that electromagnetic fields in the material are essentially affecting the trajectory. The crack trajectory stability has been studied as function of fracture energy, phase portraits of the trajectory in different media have been built, and various attractor types have been revealed. Different crack morphologies from single straight and oscillating crack propagation to straight double crack propagation were theoretically founded.
Źródło:
Acta Mechanica et Automatica; 2008, 2, 4; 67-70
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Autonomous Instrumentation for Measuring Spontaneous Electromagnetic Emissions in Mining
Autorzy:
Maniak, Krzysztof
Mydlikowski, Remigiusz
Powiązania:
https://bibliotekanauki.pl/articles/1839315.pdf
Data publikacji:
2020
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
coal mining
electromagnetic field
EM receiver
rock destruction
Opis:
This article presents the design of an innovative receiver capable of identifying electric and magnetic components of electromagnetic fields. The receiver senses and records electromagnetic disturbances generated as mine tunnels collapse. It offers excellent operating specification and the ability to sense and log magnetic and electrical component strength values in real time. The paper analyzes the data obtained with the use of a system installed in a working mine and attempts to determine hazards resulting from increased rock stress levels that, cause spontaneous EM emissions.
Źródło:
Journal of Telecommunications and Information Technology; 2020, 4; 98-103
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Occupational exposure to electromagnetic fields in the Polish Armed Forces
Autorzy:
Sobiech, Jaromir
Kieliszek, Jarosław
Puta, Robert
Bartczak, Dagmara
Stankiewicz, Wanda
Powiązania:
https://bibliotekanauki.pl/articles/2161913.pdf
Data publikacji:
2017-06-19
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
electromagnetic field
occupational exposure
soldiers
measurements
radar
radio
Opis:
Objectives Standard devices used by military personnel that may pose electromagnetic hazard include: radars, missile systems, radio navigation systems and radio transceivers. The aim of this study has been to evaluate the exposure of military personnel to electromagnetic fields. Material and Methods Occupational exposure to electromagnetic fields was analyzed in the work environment of personnel of 204 devices divided into 5 groups (surface-to-air missile system radars, aircraft and helicopters, communication devices, surveillance and height finder radars, airport radars and radio navigation systems). Measurements were carried out at indicators, device terminals, radio panels, above vehicle seats, in vehicle hatches, by cabinets containing high power vacuum tubes and other transmitter components, by transmission lines, connectors, etc. Results Portable radios emit the electric field strength between 20–80 V/m close to a human head. The manpack radio operator’s exposure is 60–120 V/m. Inside vehicles with high frequency/very high frequency (HF/VHF) band radios, the electric field strength is between 7–30 V/m and inside the radar cabin it ranges between 9–20 V/m. Most of the personnel on ships are not exposed to the electromagnetic field from their own radar systems but rather by accidental exposure from the radar systems of other ships. Operators of surface-to-air missile systems are exposed to the electric field strength between 7–15 V/m and the personnel of non-directional radio beacons – 100–150 V/m. Conclusions In 57% of military devices Polish soldiers work in the occupational protection zones. In 35% of cases, soldiers work in intermediate and hazardous zones and in 22% – only in the intermediate zone. In 43% of devices, military personnel are not exposed to electromagnetic field. Int J Occup Med Environ Health 2017;30(4):565–577
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2017, 30, 4; 565-577
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 92

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