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Wyświetlanie 1-15 z 18
Tytuł:
The Influence of Parameters of Stabilized Corona Discharge on its Microbicidal Effect
Autorzy:
Scholtz, V.
Kommová, L.
Julák, J.
Powiązania:
https://bibliotekanauki.pl/articles/1504701.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.77.-j
52.27.Lw
Opis:
This work presents the study of microbicidal effects of positive flashing corona, negative pulseless corona and glow corona discharges and the comparison of their efficiency in the point-to-plane arrangement in water suspension. The flashing corona seems to be the most effective one, however the interval of optimal parameters is wide. The total inhibition of microorganisms becomes after 75 s or 8-10 min of exposition for bacteria or yeast, respectively. A hypothesis explaining the different sensitivity of various microbes is postulated.
Źródło:
Acta Physica Polonica A; 2011, 119, 6; 803-806
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of Ultra Fast Deposited Diamond-Like Hydrogenated Carbon Films
Autorzy:
Sullivan, J.
Saied, S.
Zaharia, T.
Powiązania:
https://bibliotekanauki.pl/articles/1504097.pdf
Data publikacji:
2011-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.-z
52.77.-j
Opis:
Hydrogenated amorphous carbon films with diamond like structures have been formed on different substrates at very low energies and temperatures by a plasma enhanced chemical vapor deposition process employing acetylene as the precursor gas. The plasma source was of a cascaded arc type with Ar as carrier gas. The films were grown at very high deposition rates. Deposition on Si, glass and plastic substrates has been studied and the films characterized in terms of $sp^3$ content, roughness, hardness, adhesion and optical properties. Deposition rates up to 20 nm/s have been achieved at substrate temperatures below 100°C. The typical $sp^3$ content of 60-75% in the films was determined by X-ray generated Auger electron spectroscopy. Hardness, reduced modulus and adhesion were measured using a MicroMaterials Nano Test Indenter/Scratch tester. Hardness was found to vary from 4 to 13 GPa depending on deposition conditions. Adhesion was significantly influenced by the substrate temperature and in situ DC cleaning. Hydrogen content in the film was measured by a combination of the Fourier transform infrared and Rutherford backscattering techniques. Advantages of these films are: low ion energy and deposition temperature, very high deposition rates, low capital cost of the equipment and the possibility of film properties being tailored according to the desired application.
Źródło:
Acta Physica Polonica A; 2011, 120, 1; 156-162
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enrichment of AISI 316L Steel Surface Layer with Rare Earth Elements Using Ion Beams
Autorzy:
Sartowska, B.
Waliś, L.
Starosta, W.
Barlak, M.
Pochrybniak, C.
Kowalska, E.
Powiązania:
https://bibliotekanauki.pl/articles/1400431.pdf
Data publikacji:
2013-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.77.Dq
52.77.-j
72.15.Eb
81.65.-b
Opis:
Enrichment of AISI 316L steel surface layers with rare earth elements was carried out using two methods with ion beam applying. The first one was the ion implantation with the doses in the range of $1 \times 10^{15} cm^{-2}$ up to $5 \times 10^{17} cm^{-2}$ where mishmetal (Ce+La) was used as the ion source. The second method was the high intensity pulsed plasma beams. The plasma pulses contained both ions/atoms of Ce+La from the electrodes material (mishmetal). The pulse energy densities $(3 J/cm^2)$ were sufficient to melt the near surface layer of the steel and introduce those elements into the surface layer. The aim of this work was to investigate the changes of stainless steel surface properties (morphology, rare earth elements concentration, presence of identified phases) after the rare earth elements addition with or without melting. Scanning electron microscopy, energy dispersion spectroscopy, and X-ray diffraction analysis were used for initial and modified surface characterisation. Grazing-incidence X-ray diffraction shows differences in the identified phase presence in the modified surface layer connected with the modification method.
Źródło:
Acta Physica Polonica A; 2013, 123, 5; 822-824
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Argon Plasma on the Float Glass Surface
Autorzy:
Tuleta, M.
Powiązania:
https://bibliotekanauki.pl/articles/1503946.pdf
Data publikacji:
2011-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Kf
52.77.-j
82.80.-d
Opis:
Both surfaces of a commercial float glass were treated simultaneously by a low-temperature argon plasma generated by an inductively coupled rf power supply. The effect of plasma processing on the outer surface composition of both sides of the glass was analysed by means of the ion scattering spectroscopy technique. The observed recomposition of the outer surface atoms was interpreted as a result of the action of the thermal and electric fields created by the plasma on particular glass constituents.
Źródło:
Acta Physica Polonica A; 2011, 120, 1; 91-93
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth Characteristics of Plasma Electrolytic Oxidation Coatings on Aluminum Alloys
Autorzy:
Ayday, A.
Durman, M.
Powiązania:
https://bibliotekanauki.pl/articles/1400565.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.68.+m
81.65.-b
52.77.-j
Opis:
The ceramic coating on aluminum alloy was prepared in sodium metasilicate electrolyte by plasma electrolytic oxidation (PEO). The effect of PEO treating time on surface layer was investigated. The morphology and phase composition of the ceramic coatings were characterized by scanning electron microscopy (SEM) and X-ray diffractometer (XRD). The effect of the electrolyte contents on the growth mechanism, element distribution and properties of oxide layers were studied. Oxide coatings morphology is strongly dependent on PEO process time. The microdischarges characteristics were studied as well, and it is shown that size of microdischarges becomes larger with increasing time of PEO. XRD analysis showed that Plasma Electrolytic Oxidation coating has hard, dominantly Al₂O₃ phase.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 886-887
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Degradation of Polyvinylpyrrolidone by Solution Plasma Process
Autorzy:
Akyüz, A.
Özkan, M.
Powiązania:
https://bibliotekanauki.pl/articles/1030287.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
36.20.Fz
52.77.-j
66.20.-d
Opis:
The solution plasma technique, which has been recently invented by Takai and Saito, produces radicals, ions, UV photons, shock waves and metastable excited atoms. These generated active species are used as the source of some chemical reactions. The exact structure of the solution plasma is not well known at present, however it has been shown to be a versatile phenomenon for production of nanomaterials, sterilization and organic compound decomposition. Solution plasma technique has emerged as a great prospect for the chain scission (degradation) of polymers, to improve their solubility and physicochemical characteristics due to such advantages as absence of toxic materials, low temperature and usage of economical, simple equipment. In this study, polyvinylpyrrolidone, uncharged water soluble polymer of a known initial molecular weight, was continuously monitored using the continuous viscometry method, which gives the viscosity at any moment of the reaction, during the interaction of polyvinylpyrrolidone with plasma, for the first time in the literature.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 343-345
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Composition of Scales Formed on AISI 316 L Steel Alloyed with Ce/La Using High Intensity Plasma Pulses after Oxidation in 1000°C
Autorzy:
Sartowska, B.
Piekoszewski, J.
Waliś, L.
Barlak, M.
Starosta, W.
Pochrybniak, C.
Bocheńska, K.
Powiązania:
https://bibliotekanauki.pl/articles/1503944.pdf
Data publikacji:
2011-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.77.-j
72.15.Eb
81.65.Mq
Opis:
It is well documented that the high oxygen affinity elements such as Y, Ce, La, Er and other rare earth elements added to steel in small amounts can improve their high temperature oxidation resistance. Rare earth elements can be either alloyed during the steel making process or introduced through surface treatment techniques. Improvement of high temperature oxidation resistance of AISI 316 L steel by incorporation Ce and La elements into its near surface region using high intensity pulsed plasma beams in so-called deposition by the pulse erosion mode was investigated in the present work. The samples were irradiated with 3 short (μs scale) intense (energy density $3 J//cm^2$) plasma pulses. Heating and cooling processes occur under non-equilibrium conditions. In all samples the near surface layer of the thickness in μm range was melted and simultaneously doped with cerium and lanthanum. The modified samples were oxidized at 1000°C for 100 h in air. The obtained effects were: oxide scales formed on the treated samples were more fine-grained, compact and adhering better that those formed on the un-treated samples.
Źródło:
Acta Physica Polonica A; 2011, 120, 1; 83-86
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transport Parameters of $F^-$ Ions in $BF_3$
Autorzy:
Nikitović, Ž.
Stojanović, V.
Raspopović, Z.
Jovanović, J.
Powiązania:
https://bibliotekanauki.pl/articles/1205173.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
51.10.+y
52.20.Hv
52.65.Pp
52.77.-j
Opis:
In this work we presented the new results for energy dependent cross-sections and transport coefficients as a function of E/N for $F^-$ ions in $BF_3$ gas. Results were obtained by using the Monte Carlo technique for cross-section set determined on the basis of the Nanbu theory. Monte Carlo method is applied to obtain swarm parameters at temperature of T=300 K.
Źródło:
Acta Physica Polonica A; 2014, 126, 3; 724-726
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transport Coefficients in Mixtures $Ar//H_2$
Autorzy:
Nikitović, Ž.
Stojanović, V.
Powiązania:
https://bibliotekanauki.pl/articles/1400294.pdf
Data publikacji:
2013-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
51.10.+y
52.20.Hv
52.65.Pp
52.77.-j
Opis:
In this work we present electron transport coefficients for electrons in $Ar//H_2$ mixtures for the conditions used in plasma assisted technologies for semiconductor production i.e. in moderate to very high reduced electric field E/N (E - electric field, N - gas density). We used a two term numerical solution of the Boltzmann equation at the lowest E/N and mean energies and also Monte Carlo simulation technique at moderate and high E/N. We show that a good agreement with experimental data exists for low and moderate E/N and that based on the tests for pure $H_2$ and Ar we can model properly the high E/N development. Results were obtained for abundances of $H_2$ from 1% to 50%. Such data are required to test the sets of cross-section data which are necessary in kinetic models for this mixture and also to produce transport coefficients for fluid models. Hydrogen is used for etching of organic compounds, most importantly low k dielectrics, at the same time argon as a buffer gas is added to control the mean energy and distribution function. Besides, operation at high E/N allows the generation of fast neutrals for charging free etching on nanometer scales.
Źródło:
Acta Physica Polonica A; 2013, 123, 1; 73-75
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cross-Sections and Transport Properties of $F^{-}$ Ions in $F_2$
Autorzy:
Stojanović, V.
Nikitović, Ž.
Jovanović, J.
Raspopović, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1205818.pdf
Data publikacji:
2014-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
51.10.+y
52.20.Hv
52.65.Pp
52.77.-j
Opis:
We present the new results for the simple scattering cross-section set and proposed transport coefficients for $F^{-}$ ions in $F_2$ that can be used in such models. Nanbu's theory based on thermodynamic threshold energies and separating elastic and reactive collisions is used to calculate cross-sections for binary collisions of ions with atoms and molecules. Direct MC method is applied to obtain swarm parameters at temperature of T = 300 K.
Źródło:
Acta Physica Polonica A; 2014, 125, 1; 46-48
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of Excitation by Heavy Particles in Pure $H_2$ Discharges at High E/N
Autorzy:
Stojanović, V.
Nikitović, Ž.
Powiązania:
https://bibliotekanauki.pl/articles/1489837.pdf
Data publikacji:
2012-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
51.10.+y
52.20.Hv
52.65.Pp
52.77.-j
Opis:
$H_{α}$ emission profiles were calculated for the high E/N (electric field E to gas density N ratio) Townsend discharges in pure hydrogen. Heavy particle collisions including the fast neutrals and interactions with the cathode surface are also included. The basic data were chosen to be in accordance with those used by Phelps. Monte Carlo simulation technique employing null collision method was used to follow electrons and heavy particles between collisions with $H_2$ or with surface for the conditions of a high E/N. Trajectories of reaction fragments are followed after the collision until their neutralization or thermalization down to the threshold of $H_{α}$ excitation. We obtained spatially resolved emission profiles and the Doppler broadened line profiles for the conditions of the experiment of Petrović and Phelps. Intensity of the Doppler profile wing showing $H_{α}$ emission of particles emerging from the cathode direction is obtained assuming that the reflection coefficient of the fast H atoms depends on the incident angle and on energy of the incident particle.
Źródło:
Acta Physica Polonica A; 2012, 121, 3; 622-624
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transport Coefficients For Electrons in Mixtures $CF_4$/Ar/$O_2$ and CF, $CF_2$ or $CF_3$ Radicals
Autorzy:
Nikitović, Ž.
Stojanović, V.
Radmilović-Radjenović, M.
Powiązania:
https://bibliotekanauki.pl/articles/1503491.pdf
Data publikacji:
2011-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
51.10.+y
52.20.-j
52.65.Pp
52.65.Rr
52.77.-j
Opis:
Transport coefficients for electrons in mixtures of $CF_{4}$ with Ar and $O_{2}$ for ratios of the electric field to the gas number density E/N from 1 Td to 1000 Td ($1Td=10^{-21} V m^2$) are presented. The analysis of non-conservative collisions revealed a range of the reduced electric field E/N where electron attachment introduced by radicals significantly changes electron kinetics obtained for mixtures without dissociation of $CF_{4}$ gas. The results obtained by using a simple, Two Term solutions for Boltzmann's equation are verified by Monte Carlo simulations. It was found that three body attachments for oxygen is not significant for pressures that are standard in plasma etching equipment i.e. below 1 Torr. Furthermore, the attachment to CF, $CF_{2}$ and $CF_{3}$ at low mean energies is significant, several orders of magnitude. At the same time the mean energy and energy distribution functions for the given E/N are the same as in unperturbed gas mixture. The large changes of the attachment rate are sufficient to change the nature of plasmas and turn them into ion-ion plasmas with very few electrons for realistic abundances.
Źródło:
Acta Physica Polonica A; 2011, 120, 2; 289-291
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wear Performance of Hardened 1.2333 Cold Work Tool Steel by Plasma Electrolysis
Autorzy:
Özel, A.
Kumruoglu, L.
Powiązania:
https://bibliotekanauki.pl/articles/1218174.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Cd
81.40.Ef
52.50.-b
52.77.-j
Opis:
Plasma electrolysis is an electrolytic-chemical-thermal technique that can be used for local hardening of the different type of steels. The feasibility of hardening the 1.2333 cold work tool steel by applying a single-stage-local surface treatment, which combines the methods of plasma electrolysis, is discussed. The effects of treatment durations of plasma electrolytic hardening on the surface microstructural, mechanical, and tribological characteristics of 1.2333 cold work steel substrates are studied. The major advantage of the plasma electrolytic hardening is shown to be hardened layer (maximum 900 Hv - minimum 500 Hv) of the substrates consisting of martensitic phase in very short treatment durations, approximately 7 mm thick/0.5 min. Reciprocating-sliding friction and wear tests against an alumina ball counter face have shown that the application of a plasma electrolysis promotes a change in wear mechanism of the friction pair from relatively severe adhesion-abrasion to mild deformation. This results in simultaneous reduction of the volumetric wear rate from 0.18-0.2 $mm^3$ to 0.04 $mm^3$.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 304-306
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pulsed Power Application of TDI-Type Pseudospark Switches
Autorzy:
Bochkov, V.
Bochkov, D.
Gnedin, I.
Panov, P.
Powiązania:
https://bibliotekanauki.pl/articles/1807939.pdf
Data publikacji:
2009-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.35.Bj
52.35.Lv
52.75.Kq
52.77.-j
47.35.-i
Opis:
The module of pulsed power electrohydraulic installation equipped with a technological tank having 2 working electrodes, storing energy up to 3 kJ at average power of 10 kW was constructed and tested. As power switching elements pseudospark switches of TDI-type were used. During the tests organic materials (flax straw) were processed. In the paper various factors, affecting PSS electrodes erosion, are considered. Valuable recommendations on providing the best service time of the switches are summarized. The major object of the investigations is the development of technological system capable of providing a continuous production process with power consumption up to hundreds of kWh with large volumes (up to several tons) processed materials transportation. The process continuity substantially reduces cost of processing, simplifies design, and improves operational characteristics of the device and finally increases competitiveness of the production.
Źródło:
Acta Physica Polonica A; 2009, 115, 6; 1118-1121
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved Nucleation and Transition by Plasma Treatments for Fast Response Optically-Compensated-Bend Displays
Autorzy:
Wu, G.
Huang, C.
Chien, H.
Powiązania:
https://bibliotekanauki.pl/articles/1400462.pdf
Data publikacji:
2013-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.77.-j
81.65.-b
42.79.Kr
64.60.Q-
Opis:
The optically-compensated-bend mode pi-cell displays exhibit fast-response time and wide-viewing angle characteristics. However, it requires a transition of the liquid crystal molecule from an initial splay state to the bend state configuration before providing the quick operation. A high voltage and a long warm-up time are needed to transform to the bend state. In this paper, the polyimide alignment films have been modified to reduce the splay-to-bend transition time by plasma beam treatments. The proposed method was demonstrated to be highly effective in improving the overall transition time. The number of splay-to-bend nucleation sites in the assembled liquid crystal cells could be increased dramatically by up to 20 times at the initial stage, and the improvement in the cell warm-up time was achieved at 45-71% reduction at 5.5 V. The plasma processing parameters were optimized at the plasma power of 700 W, the plasma distance of 25 mm, and the plasma scan speed of 600 mm/s. In addition, we maintained the excellent optical properties and response time characteristics for the optically-compensated-bend mode liquid crystal displays.
Źródło:
Acta Physica Polonica A; 2013, 123, 5; 892-895
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 18

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