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Tytuł:
Investigating Mechanisms of Radiation-Induced DNA Damage Using Low-Energy Photons
Autorzy:
Folkard, M.
Prise, K. M.
Powiązania:
https://bibliotekanauki.pl/articles/2044651.pdf
Data publikacji:
2006-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.50.-a
Opis:
Central to any mechanistic biophysical model of radiation damage to DNA is the relationship between the amount and distribution of energy deposited in the DNA helix and the subsequent production of DNA damage. It is now clear from a number of studies that the minimum energy required to produce bond breaks in DNA is significantly lower than might be expected. For example, some biophysical models have assumed that it takes several 10s of eV to produce a double-strand break in DNA. However, using low-energy photons, we have shown that energy depositions as low as 7 eV can induce double-strand break and that this is enhanced when the DNA is hydrated, showing that free radical damage is also important.
Źródło:
Acta Physica Polonica A; 2006, 109, 3; 265-271
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Properties of a Semimagnetic Quantum Well in a Proximity of a Superconducting Film
Autorzy:
Lebecki, K. M.
Kłopotowski, Ł.
Kossut, J.
Powiązania:
https://bibliotekanauki.pl/articles/2044492.pdf
Data publikacji:
2005-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.De
74.25.Qt
Opis:
We consider, via numerical calculations, a hybrid structure made of a semimagnetic Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te quantum well deposited in a close proximity to superconducting niobium film. We simulate photoluminescence and the Faraday rotation spectra, modified by the presence of vortices in this type II superconductor. The magnitude of the evaluated effects is small - the vortex induced spectral line shape variation is of the order of 1% at 1 K and 0.1% at 3 K and is expected to occur mainly in the field range between 0.03 T and 0.05 T.
Źródło:
Acta Physica Polonica A; 2005, 108, 5; 741-748
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Understanding Radiation Damage to Cells Using Microbeams
Autorzy:
Folkard, M.
Prise, K. M.
Shao, C.
Gilchrist, S.
Schettino, G.
Michette, A. G.
Vojnovic, B.
Powiązania:
https://bibliotekanauki.pl/articles/2044649.pdf
Data publikacji:
2006-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
41.75.Ak
87.50.-a
Opis:
Cellular micro-irradiation techniques provide unique experimental opportunities for understanding how ionizing radiation interacts with living cells and tissues. Using microbeams, it is possible to deliver precise doses of radiation to selected individual cells, or sub-cellular targets in vitro. This technique continues to be applied to the investigation of a number of phenomena currently of great interest to the radiobiological community. In particular, it is the study of so-called "non-targeted" effects (where cells are seen to respond indirectly to ionizing radiation) that are benefiting most from the use of microbeam approaches.
Źródło:
Acta Physica Polonica A; 2006, 109, 3; 257-264
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High resolution TEM investigations and TDA analysis of zinc alloy with strontium addition
Autorzy:
Labisz, K.
Krupiński, M.
Pawlyta, M.
Matus, K.
Kremzer, M.
Dopierała, K.
Powiązania:
https://bibliotekanauki.pl/articles/1153727.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Og
81.70.Pg
61.66.Dk
Opis:
In this paper there are presented results of high resolution transmission electron microscope investigation concerning the structure of the Zn-Al-Si cast zinc alloy with Sr addition for crystal structure refinement after thermo-derivative analysis performed using the universal metallurgical simulator and analyzer platform. The thermo-derivative analysis allows to determine the specific points of the solidifying alloy, which is helpful for phase determination and proper heat treatment condition determination, allowing to reduce the energy costs and obtaining higher mechanical and functional properties. Using transmission electron microscopy, especially selected area diffraction method appliance it was possible to determine the phases occurring in the alloy in the state after chemical composition modification as well as after appliance of very precisely controlled cooling rate. The morphology and size of the microstructure of micro-sized eutectic was possible to determine as well the lattice parameters of the Zn α -phase. Particularly the overview will be also directed on the high resolution transmission electron microscope to achieve good insight into the structural changes on the atomic scale.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 823-826
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Role of a Laser Photography Device Illuminator in Acquisition of Spatial Information
Autorzy:
Piszczek, M.
Kowalski, M.
Szustakowski, M.
Rutyna, K.
Ludwikowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/1418030.pdf
Data publikacji:
2012-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.30.Sy
42.30.Tz
02.60.-x
Opis:
The paper is concerned with practical studies of illuminator role in the process of acquisition of spatial information with use of laser photography device. The laser photography device working according to the time-spatial framing method needs both acquisition and illumination process to happen in a very short-time. Fulfillment of both conditions is necessary for proper operation of this device. Using a specialized laser illuminator determines the growth of information potential of the laser photography device and allows reducing parasitic impact of daylight. The presented solution not only improves typical vision systems parameters but it introduces new quality for imaging devices.
Źródło:
Acta Physica Polonica A; 2012, 122, 5; 862-865
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase identification of nanometric precipitates in AlSi9Cu alloy after remelting by laser beam
Autorzy:
Pawlyta, M.
Labisz, K.
Matus, K.
Powiązania:
https://bibliotekanauki.pl/articles/1113264.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Nq
81.30.Mh
68.37.Ma
Opis:
The aim of presented paper is an investigation of the structure changes in AlSi9Cu alloy after remelting by a laser beam. Scanning transmission electron microscopy was applied for structure characterization and precipitates phase identification. In the raw material, precipitates were larger and during remelting such precipitates were dissolved and very fast crystallization came next. Observed precipitates are generally uniform: in size, shape, and chemical composition. Generally, after remelting precipitates are not uniformly distributed in the whole sample but areas with dense, nanometric precipitates are common. Numerous volumes with elongated Ti precipitates, identified as Ti(Al_{1-x}Si_{x})₃, were found. Observed precipitate can strongly affect material properties (even in a case of law Ti concentration) because it may act as a crystal nucleus for other phases.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 827-829
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research and Parameter Optimization of the Pattern Recognition Algorithm for the Eye Tracking Infrared Sensor
Autorzy:
Murawski, K.
Różanowski, K.
Krej, M.
Powiązania:
https://bibliotekanauki.pl/articles/1399388.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.05.Pj
02.60.Pn
Opis:
The paper presents the process and results of tests of the pattern recognition algorithm. The algorithm has been developed for the sensor to track the activity of the eyes. The study was conducted on a group of ten people. The group was selected, so that it was possible to determine the influence of gender, age, eye color, contact lenses and glasses on the result of the algorithm. The object of the study was also to optimize the pattern recognition algorithm in terms of CPU utilization. For this purpose the duration of the algorithm steps were measured as a function of the allocation of tasks to multiple processor cores.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 513-516
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetotransmission Measurements of Intra-Shallow-Donor Transitions in Semi-Insulating GaAs
Autorzy:
Karpierz, K.
Kożuchowski, K.
Grynberg, M.
Powiązania:
https://bibliotekanauki.pl/articles/1920976.pdf
Data publikacji:
1992-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.40.+w
78.20.Ls
78.50.Ge
Opis:
In this paper we present the results of an investigation of the 1s-2p$\text{}_{+}$ intra-shallow-donor transition by means of an extremely difficult magnetotransmission experiment performed on semi-insulating GaAs. We report the temperature dependence of the transition intensity. We noticed the absence in the absorbance spectra of a well-pronounced structure which is observed at low magnetic fields in photoconductivity measurements. The results are discussed in terms of a fluctuating potential from ionized centres in semi-insulating GaAs.
Źródło:
Acta Physica Polonica A; 1992, 82, 4; 617-619
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Substrate Local Heating on Morphology of~Al and $Al_2O_3$ Nanofilms
Autorzy:
Reszka, K.
Szczypiński, M.
Pomorska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1504112.pdf
Data publikacji:
2011-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.jm
68.55.J-
Opis:
Experimental investigations presented in this work were focused on the execution of a carousel system with its usability for step-by-step revolutions and the mechanism for clamping the heater, which made it possible to heat substrates individually within the range from 25°C to 300°C. This system was used for depositing the metallic Al films by the magnetron sputtering method on foil made of FeCrAl steel, which found application in the production of metallic catalytic reactors. It was found that in the case of not-heated foil the polycrystalline continuous Al film, which is separated from steel by an amorphous oxide nanofilm obtained spontaneously under influence of weather conditions, was created. The deposition of aluminium on foil heated to the temperature of 300°C caused the film marked by fine grains integrated with small forces to be formed. These differences had an influence on the morphology of the oxide films.
Źródło:
Acta Physica Polonica A; 2011, 120, 1; 177-180
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemiluminescence Used in Biochemical Investigations. An Application of the Lanthanide Ions as a Chemiluminescent Probe
Autorzy:
Elbanowski, M.
Staniński, K.
Kaczmarek, M.
Powiązania:
https://bibliotekanauki.pl/articles/1929807.pdf
Data publikacji:
1993-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.60.Ps
Opis:
This article concerns problems related to chemiluminescence and briefly fluorescence, which will be discussed. It also gives a review of application of the chemiluminescent method in chemistry, biology and medicine, in the absence of lanthanide ions and in their presence.
Źródło:
Acta Physica Polonica A; 1993, 84, 5; 993-1002
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonstandard Absorption on Donors in Uniformly Doped II-VI 0D Structures
Autorzy:
Karpierz, K.
Szot, M.
Grynberg, M.
Powiązania:
https://bibliotekanauki.pl/articles/2047383.pdf
Data publikacji:
2007-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Gs
72.15.Rn
72.80.Ey
73.21.Fg
Opis:
The new approach to the understanding of intrashallow donor transition in the reduced dimensionality systems is presented. The magnetospectroscopy experiments done on the CdTe/CdMgTe quantum well based samples, uniformly n-doped, show indications that the surprising lack of spectral sensitivity on applied photon energy can be understood as a result of sample response coming from its different regions. This "non spectroscopic" behaviour (in a sense of the Zeeman splitting) is a consequence of the properties of systems with reduced dimensionality where variety of centre locations in the structure results in continuous density of states available for absorption.
Źródło:
Acta Physica Polonica A; 2007, 112, 2; 237-241
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization and Valorization of Industrial Wastes (Molecular Sieves) in the Gas Complex of GP1/Z by BET and Surface Charge Method
Autorzy:
Belarbi, K.
Hadjel, M.
Powiązania:
https://bibliotekanauki.pl/articles/1032033.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
Molecular Sieves Waste
Valorize
Treatment
Analysis
Opis:
Industrial waste generates a supplementary cost for companies which must, by the force of law, take in charge their wastes, whether by their own means or through outside services. Molecular sieves used in the sections of dehydratation of natural gas become waste as soon as they are saturated and there is no possibility of regeneration. As a matter of fact, those of type 4Å are used in GP1/Z complex in Algerian company Sonatrach. Within the scope of this work the proposition to valorize these industrial wastes is put forward in the light of a series of analyses and experiments with distilled and polluted water. In this work a path is opened for further research valorization of the type 4Å saturated molecular sieves, used in the gas industry. After a simple wash with distilled water, we have noticed with the naked eye that our sample had changed color from black to white gray. We have repeated the same physical magnetism test, which was positive. We have carried a heat treatment at 100°C to remove physiosorbed water and 350°C heat treatment to remove the pore water. The surface area and pH of point of zero charge (pH_{PZC}) of used zeolite were calculated as 37.54 m² g¯¹ and 6, respectively. The surface area and the pH of point of zero charge(pH_{PZC}) of unused zeolite were calculated as 6.965 m² g¯¹ and 7, respectively.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 545-547
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical Description of SMA Actuator Dynamics based on Fermi-Dirac Function
Autorzy:
Kluszczyński, K.
Kciuk, M.
Powiązania:
https://bibliotekanauki.pl/articles/1033044.pdf
Data publikacji:
2017-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.85.St
71.20.Gj
71.20.Be
Opis:
The paper deals with possible application of the very promising SMART material - shape memory alloy. At the beginning the laboratory stand for investigation on dynamic behaviour of a SMA linear actuator is presented and results of measurements for the chosen SMA actuator F2000 are depicted and discussed. In the next stage the authors propose to use the so-called Fermi-Dirac function for description of SMA linear actuator dynamics. Applying this function for determining basic performance curve: shortening Δ L versus time t for different loads F requires proper modification of the Fermi-Dirac function and its conversion in the one-parameter family (with parameter F). Coefficients of this family are determined with the help of Hooke-Jeeves optimization algorithm and on the basis of experimental findings separately for activation and deactivation process. The both derived expressions were validated by additional laboratory investigations. Finally, the elaborated descriptions was employed in design procedure of a robot gripper. It was shown that the results of measurements for the gripper prototype are in satisfactory agreement with the results of calculations.
Źródło:
Acta Physica Polonica A; 2017, 131, 5; 1274-1279
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the current flow in superconductors: universal trends and holographic analysis
Autorzy:
Rogatko, M.
Wysokiński, K.
Powiązania:
https://bibliotekanauki.pl/articles/1048283.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.-q
74.25.Sv
11.25.Tq
Opis:
The superconducting state can be destroyed by the increase of temperature, magnetic field or current flow beyond their critical values. The critical current I_{c} is of special interest as most of the practical applications of superconductors crucially depend on its limiting value. Recent analysis of experimental data in many families of type I and type II superconductors have discovered an interesting universal relation between critical current density j_{c}, the critical magnetic field H_{c} and the penetration depth λ. For type II superconductors the role of the thermodynamic critical field H_{c} is played by the lower critical field H_{c1} and ratio between the relevant dimension of the system d with respect to the penetration depth matters. Thus the effective dimensionality of the system is important and rules the system behaviour. It turns out that the holographic analogy provides an interesting justification of the above findings. We have calculated the temperature dependence of the critical current in the strongly coupled holographic superconductors with the current flow. It has been found that, independently of the symmetry of the order parameter, the critical current depends on temperature in 2d systems as I_{c} ∝ (T_{c}-T)^{3/2} and agrees with that observed in thin films (d < λ). Similar calculations for 3d systems (d > λ) reveal linear T-dependence I_{c} ∝ (T_{c}-T).
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 376-379
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Behaviour of Core/Shell Nanoparticle Assemblies: Interparticle Interactions Effects
Autorzy:
Trohidou, K.
Vasilakaki, M.
Powiązania:
https://bibliotekanauki.pl/articles/1539059.pdf
Data publikacji:
2010-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Tt
75.40.Mg
75.50.Bb
75.50.Vv
75.30.Et
75.60.Ej
75.50.Lk
75.50.Cc
75.50.Ss
75.75.+a
Opis:
Interparticle interactions in assemblies of nanoparticles represent an important effect that modifies their magnetic behavior. The characteristics of the hysteresis loop and the temperature dependent magnetization (field cooled (FC)/zero-field cooled (ZFC)) are studied numerically in magnetic nanoparticle assemblies using Monte Carlo simulations and the standard Metropolis algorithm. We study composite spin nanostructures with ferromagnetic (FM) core/antiferromagnetic (AFM) shell morphology and simple ferromagnetic nanostructures. Both three-dimensional granular solids and two-dimensional ordered nanoparticle arrays are analyzed and compared, with emphasis on the interplay between single-particle characteristics and magnetostatic interparticle interactions. We find that the antiferromagnetic interface provides a strong exchange coupling with the ferromagnetic core and, through it, an effective long range interparticle correlation, modified from that of simple FM nanostructures. The results of our simulations are compared with experimental findings.
Źródło:
Acta Physica Polonica A; 2010, 117, 2; 374-378
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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