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Wyszukujesz frazę "radiation field" wg kryterium: Temat


Tytuł:
Review of computer codes for modeling corrosion product transport and activity build-up in light water reactors
Autorzy:
Rafique, M.
Mirza, N. M.
Mirza, S. M.
Iqbal, M. J.
Powiązania:
https://bibliotekanauki.pl/articles/148648.pdf
Data publikacji:
2010
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
corrosion product
light water reactors
fuel cladding
radiation field
Opis:
The corrosion products are among the leading sources of radiation in primary coolant circuits of pressurized water reactors leading to prolongation of reactor down-time for routine maintenance entailing substantial loss of revenues. These deposits affect adversely coolant flow rates resulting in elevation of fuel and cladding temperature and become activated by high neutron flux in reactor core consequently creating high radiation field by accumulating in the out-of-core reactor components. In the case of light water reactors (LWRs), prevailing corrosion products include 59Fe, 99Mo, 56Mn, 58Co, and 60Co. The 56Mn is the leading corrosion product activity source during operation while cobalt isotopes dominate the activity after reactor shutdown. This paper presents a detailed discussion on some computer codes developed for prediction and transport of corrosion product activity in LWRs.
Źródło:
Nukleonika; 2010, 55, 3; 263-269
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on dose correction method of vehicle-borne environmental radiation measurement equipment
Autorzy:
Xu, Jie
Ren, Jizhou
Yang, Jianbo
Fan, Jiawen
Li, Rui
Li, Hui
Huang, Weiqi
Yuan, Biao
Powiązania:
https://bibliotekanauki.pl/articles/2055679.pdf
Data publikacji:
2021
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dose correction factor
reference radiation field
vehicle-borne environmental radiation measurement equipment
Opis:
This study establishes a near-ground reference radiation field based on typical radionuclides of the Fukushima accident in response to the need for vehicle-borne environmental radiation measurement equipment that can accurately evaluate the environmental dose of nuclear accidents. The Monte Carlo code FLUKA is used to study the environmental dose of such equipment in the early and mid-late reference radiation fields of nuclear accidents. Results of the air dose rate at 1 m above the ground were corrected to eliminate data difference between diverse measurement platforms. Simulation results show that t he dose correction factor (CF) fluctuates at approximately 0.8813 in the early reference radiation field and at approximately 0.6711 in the mid-late reference radiation field . This deviation of the dose CF in the early and mid-late reference radiation field s is within 2% and is not affected by the change in detector position. This research can be applied to obtain more accurate measurement of an ambient dose in the near-ground radiation field and support the vehicle-borne environmental radiation measurement technology.
Źródło:
Nukleonika; 2021, 66, 3; 103--110
0029-5922
1508-5791
Pojawia się w:
Nukleonika
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:
Kontrola i kształtowanie warunków pracy w polach i promieniowaniu elektromagnetycznym. Zakres częstotliwości od O Hz do 300 GHz
Principles of controlling and shaping working conditions in electromagnetic fields and radiation in the frequency range from0Hz to300GHz
Autorzy:
Karpowicz, J.
Gryz, K.
Powiązania:
https://bibliotekanauki.pl/articles/180772.pdf
Data publikacji:
2001
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
pole elektromagnetyczne
promieniowanie elektromagnetyczne
warunki pracy
narażenie zawodowe
electromagnetic field
electromagnetic field radiation
work conditions
occupational exposure
Opis:
W artykule omówiono nowelizację i ujednolicenie zasad ograniczania ekspozycji zawodowej w polach elektromagnetycznych z pasma od 0 Hz do 300 GHz, które weszły do stosowania 23 lipca (Dz. U. nr 4/2001, poz. 36). Wartości najwyższych dopuszczalnych natężeń (NDN) oparto na wynikach analizy dotychczas obowiązujących polskich przepisów (ustanawianych od 1972 r.), zaleceń międzynarodowych, projektów norm europejskich, przeglądu światowej literatury dotyczącej efektów biologicznych i zdrowotnych związanych z ekspozycją na pola elektromagnetyczne oraz wynikach badań krajowych.
The article discusses an amendment and unification of the principles of limiting occupational exposure to electromagnetic fields (EMF) in the range from O Hz to 300 GHz, which came into force on July 23 (DzU, 4/2001, item 36). The Maximal Admissible Intensity values were based on the results of an analysis of previous Polish regulations (established since 1972), international recommendations, drafts of European standards and a survey of the world literature on the biological effects of EMF and on the health effects of exposure to EMF and on the results of Polish research.
Źródło:
Bezpieczeństwo Pracy : nauka i praktyka; 2001, 10; 7-13
0137-7043
Pojawia się w:
Bezpieczeństwo Pracy : nauka i praktyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Full-wave Analysis of Periodic Baffle System in Beamforming Applications
Autorzy:
Tasinkevych, Y.
Danicki, E.
Powiązania:
https://bibliotekanauki.pl/articles/177861.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sound field calculation
linear phased arrays
BIS expansion
far-field radiation pattern
beam-steering
transducer arrays
composite transducers
scattering
generation
fields
Opis:
Mixed boundary-value problem for periodic baffles in acoustic medium is solved with help of the method developed earlier in electrostatics. The nice feature of the method is that the resulting matrices are relatively easy for computations and that the results satisfy exactly the energy conservation law. Illustrative numerical examples present the wave-beam steering (in the far-field) in a baffle system that may be considered as a model of one-dimensional ultrasonic transducer array.
Źródło:
Archives of Acoustics; 2010, 35, 4; 661-675
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distributed radiation monitoring system for linear accelerators based on CAN bus
Autorzy:
Kozak, T.
Makowski, D.
Napieralski, A.
Powiązania:
https://bibliotekanauki.pl/articles/397933.pdf
Data publikacji:
2010
Wydawca:
Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
Tematy:
obszar pod kontrolą sieci
dozymetria promieniowania gamma
dozymetria promieniowania neutronowego
akcelerator liniowy
controller area network
gamma radiation dosimetry
neutron radiation dosimetry
radiation sensing Field Effect Transistor
linear accelerator
X-ray free electron laser
Opis:
Gamma and neutron radiation is produced during the normal operation of linear accelerators like Free-Electron Laser in Hamburg (FLASH) or X-ray Free Electron Laser (X-FEL). Gamma radiation cause general degeneration of electronics devices and neutron fluence can be a reason of soft error in memories and microcontrollers. X-FEL accelerator will be built only in one tunnel, therefore most of electronic control systems will be placed in radiation environment. Exposing control systems to radiation may lead to many errors and unexpected failure of the whole accelerator system. Thus, the radiation monitoring system able to monitor radiation doses produced near controlling systems is crucial. Knowledge of produced radiation doses allows to detect errors caused by radiation, schedule essential replacement of control systems and prevent accelerator from serious damages. The paper presents the project of radiation monitoring system able to monitor radiation environment in real time.
Źródło:
International Journal of Microelectronics and Computer Science; 2010, 1, 1; 52-55
2080-8755
2353-9607
Pojawia się w:
International Journal of Microelectronics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ambient fields generated by a laser spark
Autorzy:
Rohlena, K.
Mašek, M.
Powiązania:
https://bibliotekanauki.pl/articles/148063.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
laser spark
radiation chemistry
field generation
Opis:
The electric and magnetic fields surrounding a laser spark formed after an optical breakdown due to a focused nanosecond laser beam in a gaseous environment are examined in order to assess their possible influence on the processes going on in the gas medium, mainly chemical reactions triggered by the spark plasma radiation. The magnetic field is generated by the standard mechanism of crossed electron density and temperature gradients, the electric field is supposed to be produced by the plasma polarization due to its radial expansion across the self-generated magnetic field. A simple model of spark plasma formation near the tip of the focal cone is assumed, with a delayed breakdown, which allows the focused laser light to sweep the whole volume of the forming spark right down to the focal caustic and thus to form a centimeter long plasma cone. In this conical geometry, the value of plasma electric dipole moment is evaluated as a measurable quantity as well as approximate values of the electric and magnetic field near the focal caustic, where they both tend to grow in magnitude.
Źródło:
Nukleonika; 2016, 61, 2; 119-124
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electromagnetic fields and electromagnetic radiation as non-invasive external stimulants for seeds [selected methods and responses]
Autorzy:
Pietruszewski, S.
Muszynski, S.
Dziwulska, A.
Powiązania:
https://bibliotekanauki.pl/articles/24466.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
laser radiation
electromagnetic field
seedling
pre-sowing stimulation
electromagnetic radiation
seed
Źródło:
International Agrophysics; 2007, 21, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low-Frequency Noise Attenuation in a Closed Space Using Adaptive Directivity Control Sources of a Quadrupole Type
Autorzy:
Giouvanakis, Marios
Sevastiadis, Christos
Papanikolaou, George
Powiązania:
https://bibliotekanauki.pl/articles/176748.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
modal field
noise control
adaptive radiation sources
Opis:
A novel method of active noise control using adaptive radiation sound sources is investigated. A finite element model of a modal enclosed sound field is excited harmonically, representing a noise field in the low-frequency range. The control sources are comprised of elementary dipole sources for which the driving signals are adjusted by an optimization method. Two set-up cases of the proposed compound sources are investigated. The coupling of the control sources with the modal sound field is discussed. The simulated performance of the proposed method is compared with that of a system with distributed simple sources and the results show the effectiveness of the sources with adaptive radiation for active noise control in small enclosures.
Źródło:
Archives of Acoustics; 2019, 44, 1; 71-78
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakterystyki wybranych źródeł niezamierzonego promieniowania elektromagnetycznego
Characteristics of selected unfolded sources electromagnetic radiation
Autorzy:
Paś, J.
Powiązania:
https://bibliotekanauki.pl/articles/309782.pdf
Data publikacji:
2017
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
pole elektromagnetyczne
promieniowanie
indukcja
electromagnetic field
radiation
induction
Opis:
W artykule przedstawiono wybrane charakterystyki promieniowania niezamierzonych źródeł pola elektromagnetycznego z zakresu małych częstotliwości. Przedstawiono metodykę pomiaru poszczególnych składowych pola elektromagnetycznego – natężenia E pola elektrycznego i indukcji B pola magnetycznego. W artykule zaprezentowano przykładowe wyniki badań dla wybranych źródeł pola elektromagnetycznego oraz przeprowadzono analizę otrzymanych wyników według obowiązujących unormowań prawnych.
The article presents selected radiation characteristics of unintended sources of low frequency electromagnetic field. The methodology for measuring the individual components of the electromagnetic field - E of electric field and induction B of magnetic field - was presented. The article presents examples of research results for selected sources of electromagnetic field and analysis of obtained results according to current legal regulations.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2017, 18, 12; 1204-1207, CD
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-band coaxial monopole antenna with an additional metal screen
Autorzy:
Khruslov, M.
Pazynin, V.
Powiązania:
https://bibliotekanauki.pl/articles/307620.pdf
Data publikacji:
2007
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
monopole antenna
near field
radiation pattern
FDTD technique
Opis:
The novel coaxial monopole antenna design with an additional metal screen is presented. The radiation char- acteristics of this antenna are investigated depending on a dis- tance between the ground plane and additional metal screens, as well as on a size of the latter. Measured and calculated ra- diation patterns are compared within limits of the operative frequency band and their revealed distinctions are discussed. The antennas characteristics allow pronounce that it can be considered as a promising candidate for various practical ap- plications both a single radiator and a composite element of antenna arrays.
Źródło:
Journal of Telecommunications and Information Technology; 2007, 1; 30-34
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laminar mixed convection flow from a vertical surface with induced magnetic field and convective boundary
Autorzy:
Chaudhary, K.
Sharma, A.
Jha, A. K.
Powiązania:
https://bibliotekanauki.pl/articles/264352.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
promieniowanie cieplne
absorpcja promieniowania
pole magnetyczne
thermal radiation
radiation absorption
convective boundary
induced magnetic field
Opis:
The objective of this investigation is to study the influence of thermal radiation and radiation absorption parameter on a mixed convection flow over a continuously moving porous vertical plate under the action of transverse applied magnetic field taking into account the induced magnetic field with convective boundary. Under certain assumptions, the solutions for the velocity field, temperature distribution and induced magnetic field are obtained. The influences of various parameters on the velocity, temperature fields and on induced magnetic fields are studied graphically. It is also found that the dimensionless Prandtl number, Grashof number, Schmidt number and magnetic parameter have an appreciable influence on the independent variables.
Źródło:
International Journal of Applied Mechanics and Engineering; 2018, 23, 2; 307-326
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Penetrative convection due to absorption of radiation in a magnetic nanofluid saturated porous layer
Autorzy:
Mahajan, Amit
Sharma, Mahesh Kumar
Powiązania:
https://bibliotekanauki.pl/articles/178577.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
magnetic nanofluids
penetrative convection
Darcy model
radiation absorption
magnetic field
Opis:
The present study investigates the onset of penetrative convection induced by selective absorption of radiation in a magnetic nanofluid saturated porous medium. The influence of Brownian motion, thermophoresis, and magnetophoresis on magnetic nanofluid treatment is taken into consideration. The Darcy’s model is selected for the porous medium. We conduct a linear stability analysis to examine the onset of instability and evaluate the results for two different configurations, namely, when the layer is heated from below and when the layer is heated from above. The numerical investigations are carried out by applying the Chebyshev pseudospectral method. The effect of the porosity parameter E, parameter Y (represents the ratio of internal heating to boundary heating), Lewis number Le, concentration Rayleigh number Rn, Langevin parameter αL, width of nanofluid layer d, diffusivity ratio η, and modified diffusivity ratio NA is examined at the onset of convection. The results indicate that the convection commences easily with an increase in the value of Y, Le, and NA but opposite in the case with a decrease in the value of E, αL, η and d for both the two configurations. The parameter Rn advances the onset of convection when the layer is heated from below, while delays the onset of convection when the layer is heated from above.
Źródło:
Studia Geotechnica et Mechanica; 2019, 41, 3; 129-142
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Size of Source Effect on Accuracy of LWIR Radiation Thermometers
Autorzy:
Cywiak, D.
Cárdenas-García, D.
Rodriguez-Arteaga, H.
Powiązania:
https://bibliotekanauki.pl/articles/221785.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
size of source effect
radiation thermometer
temperature
field of view
Opis:
Determining the size of source effect of a radiation thermometer is not an easy task and manufacturers of these thermometers usually do not indicate the deviation to the measured temperature due to this effect. It is one of the main uncertainty components when measuring with a radiation thermometer and it may lead to erroneous estimation of the actual temperature of the measured target. We present an empiric model to estimate the magnitude of deviation of the measured temperature with a long-wavelength infrared radiation thermometer due to the size of source effect. The deviation is calculated as a function of the field of view of the thermometer and the diameter of the radiating source. For thermometers whose field of view size at 90% power is approximately equal to the diameter of the radiating source, it was found that this effect may lead to deviations of the measured temperature of up to 6% at 200ºC and up to 14% at 500ºC. Calculations of the temperature deviation with the proposed model are performed as a function of temperature and as a function of the first order component of electrical signal.
Źródło:
Metrology and Measurement Systems; 2016, 23, 4; 661-667
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Protection against high-frequency radiation of aviation electronic support systems used in air transport
Autorzy:
Dzunda, M.
Cekanova, D.
Cobirka, L.
Zak, P.
Dzurovcin, P.
Powiązania:
https://bibliotekanauki.pl/articles/116582.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
air transport
aviation electronic support systems
high-frequency radiation
radiation
electromagnetic radiation
arport radars
air electronic safety technology
radar electric field
Opis:
The aim of the article is to analyze the impact of electromagnetic radiation of aviation electronic support systems on environmental segments and a human organism. We were looking for effects of electromagnetic radiation on inhabitants and environment in the vicinity of airport radars. We accomplished measuring and found out the level of radiation harmfulness of electromagnetic radiation sources. In the conclusion we suggest to eliminate the negative impact of electromagnetic radiation on the human organism. At the same time we present the ways how workers, performing their jobs in the vicinity of strong electromagnetic radiation source, can protect themselves in compliance with legislative of the Slovak Republic. We have proposed some possibilities of protection for workers who work close to a strong source of electromagnetic radiation.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 1; 183-186
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł

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