Wyniki wyszukiwania - Biblioteka Nauki

1

Detectors of UV and infrared radiation obtained using silicon micromachining

100%

Dobrzański L.

Materiały Elektroniczne

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2001

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tom T. 29, nr 1-2

69-69

EN

Technology of the surface silicon micromachining developed in ITME compnses fabrication of a porous silicon as a sacrificial layer. This is need to suspend device over a cavity and thermally isolate sensing element from the heat sink. Two types of devices have been fabricated and characterised a: bolometer and a termopile.

2

Estimation of the radiation power at the output of holographic memory system

100%

Andruchow A. , Jagoszewski E.

Optica Applicata

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2003

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tom Vol. 33, nr 2-3

533-537

EN

The aim of this paper is to determine the light intensity distribution after the passage of a laser beam through the particular sub-assemblies of the optical holographic system. On this basis we want to determine the laser beam power necessary for respective reading in and reading out the information

3

Theoretical basis and practice application calculation of radiation heat transfer by light design program

80%

Hauser J. , Skrzypczak P. , Wesołowski M.

Computer Applications in Electrical Engineering

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2015

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tom Vol. 13

386--393

EN

In the article are presented the results of the irradiance obtained by using Dialux program. The calculations were made for two cases of simple geometries, which are known according to analysis to determine the average values of geometrical configuration factor. A comparison of the results obtained and confirmed their compliance. Dialux program for some systems which certain some conditions and simplifying assumptions described in section 1 can be used, and radiometric parameters obtained do not differ from those of analytically calculation. The program allows a adopt for radiating surface nolambertian radiation intensity distribution. This expands the applicability of the calculation to the areas where analytical calculations are time consuming and complicated. Confirmation are set out in section 6 of the calculations for the heating system of real more complicated situations.

4

Radiation curing of silica for silica-rubber composites

80%

Dondi D. , Palamini C. , Pepori F. , Buttafava A. , Galinetto P. , Faucitano A.

Nukleonika

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2009

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tom Vol. 54, No. 2

71-75

EN

The functional modification of silica samples based on the reaction of “grafting” of polybutadiene olygomers carried out by gamma-irradiation in the presence of air at room temperature has been investigated. The yield of grafted PB reaches a maximum at doses of about 30 kGy, then decreases as a consequence of the oxidative degradation. The reaction is accompanied by the build up of carbonyls and peroxides up to 0.1 moles/kg and it leads to a rapid consumption of the double bonds concentration as determined by both FTIR and Raman spectroscopy. The results of the EPR analysis are diagnostic of a mechanism of immobilization of the olygomer based on cross-linking of polybutadiene which is initiated by the SiO2 radiolytic species. Depending on the nature of the SiO2 species, the mechanism of initiation leads to immobilized PB either really grafted to the silica surface or simply physically absorbed.

5

The influence of inlet boundary conditions on the near field of a plane turbulent jet

80%

Simpson B. A. F. , Holdo A. E.

Applied Mechanics and Engineering

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1999

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tom Vol. 4, no 4

817-821

EN

Numerical investigations into the sensitivity of the near field of a plane jet to the inlet boundary conditions were performed, employing both finite element and finite volume methods together with the k-'epsilon' turbulence model. The study shows that the near field is insensitive to the turbulent inlet boundary conditions when a uniform velocity profile is used. However, when a non-uniform, shear dominated velocity profile is used, the assignment of turbulent parameters has a substantial effect on the solution.

6

Radiation and free convection flow past a moving plate

80%

Raptis A. , Perdikis C.

Applied Mechanics and Engineering

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1999

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tom Vol. 4, no 4

817-821

EN

This paper deals with the effects of thermal radiation by taking into account the free convection flow over a moving plate. The fluid considered is a gray, absorbing-emitting radiation but non-scattering medium.

7

Zasięg i poziomy promieniowania elektromagnetycznego

80%

Bogucki J.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

|

1999

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tom nr 1

33-35

PL

Podano sposób określania zasięgu występowania elektromagnetycznego promieniowania o wartościach dopuszczalnych w świetle obowiązujących zmienionych przepisów prawnych. Omówiono, jakie funkcje powinien spełniać system ochrony środowiska.

EN

Electromagnetic radiation range and levels are described basing on current Polish regulations. The system of environment protection from electromagnetic hazards is showed too.

8

Thermal radiation in the presence of free convective flow past a moving vertical porous plate - an analytical solution

80%

Raptis A. , Toki C. J.

International Journal of Applied Mechanics and Engineering

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2009

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tom Vol. 14, no 4

1115-1126

EN

An analytical solution to the problem of the unsteady free convection flow of a gray fluid past an infinite vertical porous plate which moves with constant velocity in a viscous and incompressible fluid in the presence of radiation is presented by using the Laplace transform technique. The effect of e radiation on the velocity and temperature are presented graphically.

9

Vilém Santholzer: vědec a avantgardista mezi krásou stroje a záření

80%

Vítů V.

Umění (Art)

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2021

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tom 69

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nr 4

438-457

EN

Vilém Santholzer was a Czech radiologist who in the second half of the 1920s published around thirty articles and several of his own photographs of radiation on the pages of avant-garde journals. The article explores his activities and situates them in the context of the interest of the European avant-garde in the machine aesthetic on the one hand and scientific photography on the other. It shows that for Santholzer beauty was always the direct result of other properties of an object associated with truth; in his view, machines were something beautiful if they were functional, and photographs were beautiful if they were authentic. While we can connect his thought on the machine aesthetic with the ideas of Russian constructivism, Le Corbusier, Karel Teige or Werner Graeff, in the case of his photographs we can find parallels among authors interested in the power of photography to make the invisible visible, i.e. above in the work of László Moholy-Nagy and once again Karel Teige. What then remains a peculiar feature of Santholzer’s thought is his belief in the beauty of pure, unapplied mathematics, which he set out in his polemics with Karel Honzík on the pages of Pásmo.

CS

Vilém Santholzer byl český radiolog, který v druhé polovině dvacátých let na stránkách avantgardních periodik publikoval ke třem desítkám článků a několik vlastních fotografií radiového záření. Článek sleduje tuto jeho aktivitu a zasazuje ji do kontextu zájmu evropské avantgardy o strojovou estetiku na jedné straně a vědeckou fotografii na straně druhé. Ukazuje, že pro Santholzera je krása vždy přímým důsledek jiných vlastností objektu spojených s pravdou: stroje jsou podle něho krásné, jsou-li účelné, fotografie, jsou-li autentické. Zatímco jeho úvahy věnované strojové estetice můžeme dát do souvislostí s myšlenkami ruského konstruktivismu, Le Corbusiera, Karla Teiga či Wernera Graeffa, v případě jeho fotografií lze hledat paralely u autorů tematizujících možnosti fotografie zviditelnit neviditelné, tedy především u László Mohly-Nagye a opět u Karla Teiga. Zvláštním rysem Santholzerova myšlení pak zůstává jeho přesvědčení o kráse čisté, neaplikované matematiky, které je představeno prostřednictvím Santholzerovy polemiky s Karlem Honzíkem na stránkách Pásma.

10

Thermal radiation of an optically thin gray gas

80%

Raptis A. , Perdikis C.

International Journal of Applied Mechanics and Engineering

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2003

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tom Vol. 8, no 1

131-134

EN

In this paper, we study the effects of thermal radiation on the unsteady free convection and mass transfer boundary layer over a vertical moving plate of an optically thin gray gas.

11

Radiation effects on flow past an impulsively started infinite vertical plate with variable temperature

80%

Muthucumaraswamy R. , Ganesan P.

International Journal of Applied Mechanics and Engineering

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2003

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tom Vol. 8, no 1

125-129

EN

The effects of thermal radiation on flow past an impulsively started infinite vertical plate in the presence of variable temperature is considered. The temperature near the plate is made to rise linearly with time. The fluid considered is a gray, absorbing-emitting radiation but a non-scattering medium. The dimensionless governing equations are solved using the Laplace-transform technique. The velocity and temperature are studied for different parameters like the Prandtl number, time and radiation parameter. It is observed that the velocity slightly decreases with increasing the value of the radiation parameter.

12

Radiation–induced synthesis of polymeric nanogels

80%

Kadłubowski S. , Ulański P. , Rosiak J. M.

Engineering of Biomaterials

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2017

|

tom Vol. 20, no. 143 spec. iss.

33

13

Verification of the model of a solar energy radiation input to the sea surface against actinometric data

80%

Krężel A. , Kozłowski Ł.

Oceanological Studies

|

2001

|

tom Vol. 30, No. 3-4

17-38

EN

Data on the planetary albedo which were registered in Channel 0.4 - 1.1 mum (VIS) by the geostationary satellite METEOSAT were used to determine a quantitative characteristic of a cloud cover over the Baltic Sea area. By applying the obtained results and the input data generated by the model of the Interdisciplinary Centre for Mathematical and Computational Modelling of the Warsaw University, calculations of irradiance on the sea surface were done using the model of radiation transmission in the Baltic Sea atmosphere. The results were compared to the actinometric data that were continuously recorded by the Gdansk Maritime Institute's measuring buoy that was anchored at 18°31.094'E and 54°56.157'N. It was noted that the application of ICM model information on the atmosphere to the solar radiation transmission model results in decreasing the calculated irradiance values by approximately 15% in relation to the measured values. If cloud cover data in the input data set are replaced by relevant satellite data, then the average difference between the measured data and the modelled ones decreases to approximately 5%.

14

A new quartz for y-transfer calibration of radiation sources

80%

Richter D. , Woda C. , Dornich K.

Geochronometria

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2020

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tom Vol. 47, no.1

23--34

EN

Quartz grains extracted from aeolian sand (LexCal2014) are tested for suitability as transfer material for radiation source calibration. After thermal pre-treatment, this quartz exhibits luminescence and dose-response properties which appear appropriate for transfer calibration purposes with little dependence of recovered β-dose on preheat temperature in the single aliquot (SAR) procedure and satisfying performance in β-dose recovery (0.98−1.00 given/measured β-dose for various experiments). Additional support is obtained by SARA and interpolation procedures, where OSL-data from γ-dosed LexCal2014 is interpolated on data obtained for zeroed LexCal2014 quartz, which is β-irradiated by the source to be calibrated. Initial results on fine-grain material agree with the coarse grain results presented. The γ-dose of 3.00 ± 0.07 Gy is administered in a scatter-free geometry at the IAEA/WHO Secondary Standard Dosimetry Laboratory (SSDL) of the Helmholtz Zentrum München, with absorbed dose calculations obtained by Monte Carlo simulations.

15

Numerical solution through mathematical modelling of unsteady MHD flow past a semi-infinite vertical moving plate with chemical reaction and radiation

80%

Bhandari A.

Studia Geotechnica et Mechanica

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2018

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tom Vol. 40, nr 4

270--281

EN

In the present manuscript, unsteady magnetohydrodynamic (MHD) flow over a moving porous semi-infinite vertical plate with time-dependent suction has been studied in the presence of chemical reaction and radiation parameters. Time-dependent partial differential equations in the dimensionless form are solved numerically through mathematical modelling in COMSOL Multiphysics. The results are obtained for velocity, temperature and concentration profiles at different times. Steady state results are also presented for different values of physical parameters. The parameters involved in the problem are useful to change the characteristics of velocity, heat transfer and concentration profiles. The numerical solution of partial differential equations involved in the problem is obtained without sacrificing the relevant physical phenomena.

16

Applications of deep x-ray lithography

80%

Hirata Y.

Materiały Elektroniczne

|

2001

|

tom T. 29, nr 1-2

61-68

EN

We developed the LIGA process using a compact synchrotron radiation (SR) source and ceramics micro fabrication process. These processes realized an array of lead zir-conate titanate (PZ7) rods whose cross section is 25 urn and was applied to manufacture piezocomposite for high resolution ultrasonic diagnosis for the first time. We also developed microconnector by the LIGA process.

17

Radiation effects on flow past an impulsively started infinite vertical plate

80%

Ganesan P. , Loganathan P. , Soundalgekar V. M.

International Journal of Applied Mechanics and Engineering

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2001

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tom Vol. 6, no 3

719-730

EN

Flow past an impulsively started infinite vertical isothermal plate in the presence of thermal radiation effects is studied here. The fluid considered is a gray, absorbing-emitting radiation but a non-scattering medium. It is observed that for an increase in radiation parameter N or the Grashof number Gr, there is a fall in the velocity or temperature, but compared to the no-radiation case, there is a rise in the velocity and temperature of the fluid.

18

The effect of boundary conditions on effective thermal conductivity of heterogeneous materials in transient state

80%

Polesek-Karczewska S.

Archives of Thermodynamics

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2003

|

tom Vol. 24, no 4

3-14

EN

The measured temperature distributions in the layer of heated packed bed is presented in the paper. Analytical solutions of Fourier heat conduction equation for two different boundary conditions are found. The comparison of between the experimental data and theoretical predictions are used to estimate the corresponding values of effective thermal conductivity, which is the matching parameter of considered problem. The analysis leads to the conclusion that the contribution of radiation mechanism in the transient processes in non-homogeneous materials may be considerable for the jump boundary conditions.

19

Poly(acrylic acid) nanogels – basic reactions and applications

80%

Matusiak M. , Kadłubowski S. , Ulański P.

Engineering of Biomaterials

|

2018

|

tom Vol. 21, no. 148

70

20

Observational evidence for human impact on aerosol cloud-mediated processes in the Baltic region

80%

Krüger O.

Oceanologia

|

2014

|

tom No. 56 (2)

205--222

EN

Knowledge about aerosol cloud-mediated processes is important for judging climate change in Europe during recent decades. Here, some observational evidence for anthropogenic influences is described and discussed. The emphasis is laid on the effects of the large emissions of sulphur dioxide and particulate matter during the 1980s in Europe and the subsequent strong decrease in the 1990s. In addition, an analysis of the dependence of aerosol cloud-mediated processes on atmospheric circulation patterns (Grosswetterlagen) is presented.