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Wyświetlanie 1-15 z 113
Tytuł:
Transient Thermal Phenomena during Spontaneous Water Migration in Zeolite Beds
Autorzy:
Żołądek-Nowak, J.
Milczarek, J.
Fijał-Kirejczyk, I.
Żołądek, J.
Jurkowski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1419615.pdf
Data publikacji:
2012-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.75.Jn
61.05.Tv
47.56.+r
81.05.Rm
Opis:
The changes in local temperature occurring during spontaneous imbibition of columnar samples of dry natural zeolite with water were studied. The temperature pulses of 20-250 s duration and 3-40°C amplitude were registered and correlated with the wetting front motion observed with neutron radiography. The amplitude of the pulses was shown to increase with increasing ambient temperature. The broadening of the temperature pulse with increasing distance from the water supplied end of the samples was observed. The amplitude and the pulse width were found to depend substantially on the drying temperature of the material. The observed effect was attributed to the heat of immersion released in the sample at the moving wetting front.
Źródło:
Acta Physica Polonica A; 2012, 122, 2; 415-418
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Characterization and Statistical Properties of Two-Dimensional Granular Systems During the Compaction
Autorzy:
Živković, S.
Jakšić, Z.
Arsenović, D.
Budinski-Petković, Lj.
Vrhovac, S.
Powiązania:
https://bibliotekanauki.pl/articles/1503325.pdf
Data publikacji:
2011-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
45.70.-n
45.70.Cc
81.05.Rm
61.43.Bn
Opis:
We study the compaction dynamics of frictional hard disks in two dimensions, subjected to vertical shaking, by numerical simulation. Shaking is modeled by a series of vertical expansions of the disk packing, followed by dynamical recompression of the assembly under the action of gravity. The second phase of the shake cycle is based on an efficient event-driven molecular-dynamics algorithm. We analyze the compaction dynamics for various values of the friction coefficient and the coefficient of normal restitution. The granular organization at local level was studied by analyzing the shape factor ξ of the local volumes, associated with a natural way of subdividing the volume into local parts - the Voronoi partition. It gives a clear physical picture of the competition between less and more ordered domains of particles during the compaction. We calculate the distribution of the shape-factor for packings at different stages of the compaction process. We have also investigated a two-dimensional granular medium experimentally. We prepared the granular packings of metallic cylinders of diameters 4, 5, and 6 mm. The distributions of the shape-factor obtained numerically for various tapping intensities are consistent with our experimental results.
Źródło:
Acta Physica Polonica A; 2011, 120, 2; 246-251
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
AC Magnetic Susceptibility Study of Fe and Co Based Nanoparticles
Autorzy:
Zeleňáková, A.
Kováč, J.
Zeleňák, V.
Powiązania:
https://bibliotekanauki.pl/articles/1368479.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.75.Fk
81.05.Rm
75.40.Cx
Opis:
We have investigated magnetic properties of three different samples composed of magnetic Fe or Co core and protective Au or Pt metallic shell, namely Fe@Au, Co@Au and Fe@Pt samples, with sizes of about 10 nm, 8 nm and 5 nm respectively. We have measured and analysed the experimental data of real and imaginary component of ac susceptibility through theoretical laws for non-interacting and interacting particles and we have estimated the strength of their magnetic interactions. Our analyses showed the increase of inter-particle interactions with decreasing particles size.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 222-223
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetocaloric effect in Gd₂O₃@SiO₂ nanocomposite
Autorzy:
Zeleňáková, A.
Hrubovčák, P.
Berkutova, A.
Kapusta, O.
Zeleňák, V.
Powiązania:
https://bibliotekanauki.pl/articles/1054708.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
81.05.Rm
75.20.Ck
75.75.Fk
Opis:
Nanocomposite consisting of Gd₂O₃ nanoparticles embedded in periodical porous silica matrix was investigated with respect to its magnetocaloric properties. Series of field (up to 5 T) dependence of magnetization data were recorded in temperature range 2-52 K. The data were subsequently processed employing Maxwell relation in order to calculate magnetic entropy change (Δ S_M) of the system. Examined nanocomposite exhibited reasonably high value of Δ S_M ≈ 29 J/(kg K) at maximal field change 5 T at the temperature of 2 K which suggests that this material could be feasible for cryomagnetic refrigeration applications.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 810-812
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ordered Nanoporous Silica Modified with Nanoparticles of Lanthanide Oxides
Autorzy:
Zeleňáková, A.
Kapusta, O.
Zeleňák, V.
Powiązania:
https://bibliotekanauki.pl/articles/1368473.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.75.Fk
81.05.Rm
75.40.Cx
Opis:
Lanthanide oxide nanoparticles were encapsulated inside of pores of highly ordered periodic silica of SBA15 type with hexagonal symmetry. The magnetic properties of such nanoperticles were investigated. The structural characterization using the SAXS, XANES, XRD, and $N_{2}$ adsorption measurements showed the presence of lanthanide oxides of $Ln_{2}O_{3}$ type (Ln=La, Pr, Nd, Gd, Eu), with the size of about 5 nm, incorporated in nanoporous channel system. Their magnetic properties, studied by SQUID apparatus, showed the weak antiferromagnetic ordering at 2 K in the nanocomposites $Gd_{2}O_{3}$@SBA15, $Pr_{2}O_{3}$@SBA15 and $Nd_{2}O_{3}$@SBA15. This behaviour of the nanoparticles is caused by blocking process of magnetic moments, which at 300 K exhibit the superparamagnetism, evidenced from ZFC/FC magnetization.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 218-219
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chaos Assisted Tunneling and Nonspreading Wave Packets
Autorzy:
Zakrzewski, J.
Delande, D.
Buchleitner, A.
Powiązania:
https://bibliotekanauki.pl/articles/1968540.pdf
Data publikacji:
1998-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.+b
32.80.Rm
42.50.Hz
Opis:
Consider an initial state lying on a primary resonance island. The state may tunnel into the chaotic sea surrounding it and further escape to infinity via chaotic diffusion. Properties of transport in such a situation are studied on an exemplary system - the hydrogen atom driven by microwaves. We show that the combination of tunneling followed by chaotic diffusion leads to peculiar large scale fluctuations of the AC Stark shift and ionization rates. An appropriate random matrix model describes accurately these statistical properties.
Źródło:
Acta Physica Polonica A; 1998, 93, 1; 179-186
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of Sound Panels Made from Recycled Footwear Treads
Autorzy:
Yildiz, F.
Parlar, A.
Parlar, Z.
Bakkal, M.
Powiązania:
https://bibliotekanauki.pl/articles/1031925.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.55.Ti
43.55.Vj
81.05.Lg
81.05.Rm
Opis:
Natural resources have been decreasing with the large expansion of the world's population. In order to supply raw material for production, new recycling approaches should be developed for waste materials. Worn shoes is one of the most common waste products that can be recycled for this purpose. According to the record, shoes are very complex products, as they can be produced from forty different materials, like leather, rubber, polymers etc. Especially the bottom layers of the shoes are made from sound absorbing materials like polyurethane, thermoplastic rubber and PVC. Because today's technology is not able to separate these materials from each other during recycling, they should be used in a homogenised state. Thus these parts were shredded into small granules and mixed. PU binder and hot press were used to obtain samples for tests. In this paper sound absorption, sound isolation, vibration isolation and thermal insulation properties of the tread mixture are investigated. In addition to that, the mechanical properties of the material were also investigated by measuring the compression strength of the material.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 936-940
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
U$\text{}_{P}$, 3U$\text{}_{P}$, 11U$\text{}_{P}$: Above-Threshold Ionization Revisited
Autorzy:
Yang, Baorui
Schafer, K. J.
Walker, B.
Kulander, K. C.
Dimauro, L. F.
Agostini, P.
Powiązania:
https://bibliotekanauki.pl/articles/1931385.pdf
Data publikacji:
1994-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.Fb
31.90.+s
32.80.Rm
Opis:
Angular distributions of very high energy photoelectrons from Xe and Kr, excited by a 50 ps, 1054 um laser, are presented. In Xe strong, narrow structures 45° off the polarization axis appear on above-threshold ionization peaks within a limited energy range centered around 9U$\text{}_{P}$, where U$\text{}_{P}$ is the intensity-dependent ponderomotive energy. Under the same conditions the effect is much weaker in krypton. These structures are discussed using a very simple classical model as well as sophisticated single active electron calculations and the Keldysh-Faisal-Reiss theory. We conclude these structures are the result of single-electron dynamics involving rescattering of a tunneling component of the continuum wave function.
Źródło:
Acta Physica Polonica A; 1994, 86, 1; 41-50
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Argon-Induced Pressure Shifts of $\text{}^{198}$Hg Spectral Lines Associated with Quasi-Rydberg Transitions
Autorzy:
Trawiński, R. S.
Powiązania:
https://bibliotekanauki.pl/articles/2046883.pdf
Data publikacji:
2006-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.70.-n
32.80.Rm
34.20.-b
Opis:
The extended Omont-Kaulakys-Ueda treatment of collisional effects on quasi-Rydberg states, in which the perturbation of the lower state is taken into account, is applied to mercury-argon system. The pressure shift coefficients of 6p-ns and 6p-nd spectral lines are calculated and compared with available experimental data.
Źródło:
Acta Physica Polonica A; 2006, 110, 1; 51-56
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Initial-value Problem in the Quasi-classical Theory of Strong-field Photoionization of Rydberg Atoms
Autorzy:
Tikhonova, O. V.
Fedorov, M. V.
Powiązania:
https://bibliotekanauki.pl/articles/1968511.pdf
Data publikacji:
1998-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.Fb
32.80.Rm
Opis:
Photoionization of Rydberg atoms is considered in the quasi-classical (WKB) approach. The total nonlinear strong-field ionization rate is found and investigated. The time of ionization, as a function of a growing field-strength amplitude, is shown to approach asymptotically the Kepler period t$\text{}_{k}$. Interference stabilization of Rydberg atoms is confirmed to exist in the case of short pulses (shorter than the Kepler period).
Źródło:
Acta Physica Polonica A; 1998, 93, 1; 77-85
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reakcja na wirus M ziemniaka (PVM) tetraploidalnych rodów ziemniaka
The reaction of tetraploid potato clones to Potato virus M (PVM) infection
Autorzy:
Tatarowska, Beata
Milczarek, Dorota
Plich, Jarosław
Flis, Bogdan
Powiązania:
https://bibliotekanauki.pl/articles/2199186.pdf
Data publikacji:
2016-12-30
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
gen Rm
inokulacja mechaniczna
inokulacja przez szczepienie
PVM
ziemniak
dene RM
mechanical inoculation
inoculation by grafting
potato
Opis:
Celem pracy było określenie reakcji rodów 4x ziemniaka na dwa różne szczepy wirusa M ziemniaka (PVM). Odporność ocenianych 15 rodów tetraploidalnych, pochodząca od S. megistacrolobum związana jest z reakcją nekrotyczną warunkowaną obecnością genu Rm. Do oceny odporności na PVM zastosowano metodę inokulacji mechanicznej i przez szczepienie. Do zakażeń wykorzystano dwa szczepy: z odmiany Uran (M-U) oraz z odmiany Giewont (M55a). W badanych rodach i 3 odmianach wzorcowych sprawdzono obecność markerów molekularnych sprzężonych z genem Rm (GP 283 i GP 250). Reakcje roślin po zakażeniu wirusem M ziemniaka były bardzo zmienne i zależały od genotypu roślin i zastosowanego szczepu PVM. Rody podzielono na grupy w zależności od obserwowanej reakcji na zakażenie PVM. Różnorodność i zmienność reakcji wskazuje, iż uwarunkowanie odporności na PVM jest bardzo złożone i należy dalej poszukiwać „hipotetycznego” czynnika związanego z genem Rm.
The aim of the study was to identify the response of potato clones (4x) to inoculation with two different strains of the Potato virus M (PVM). The resistance of the evaluated 15 tetraploid clones is derived from S. megistacrolobum and is connected to necrotic reaction governed by the gene Rm. For evaluation of resistance to the PVM, the mechanical inoculation and inoculation by grafting were applied. For the inoculation of potato plants, two strains of PVM were used, namely strain from potato cv. Uran (M-U) and strain from cv. Giewont (M55a). The tested clones and standard cultivars were checked for the presence of molecular markers GP 283 and GP 250, which are linked with the resistance gene Rm. The reaction of plants after inoculation with PVM was variable and depended on the plant genotype and the strain of the virus. The examined clones were divided into groups depending on the observed response to infection with PVM. The diversity and variability of this response indicate very complex conditioning of resistance to PVM and the "hypothetical” factor associated with gene Rm should be still sought.
Źródło:
Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin; 2016, 280; 23-33
0373-7837
2657-8913
Pojawia się w:
Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular Dynamics of Tert-butyl Chloride Confined to CPG (7.4, 15.6 nm)
Autorzy:
Szutkowska, L.
Peplińska, B.
Jurga, S.
Powiązania:
https://bibliotekanauki.pl/articles/2043639.pdf
Data publikacji:
2005-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.60.Es
81.05.Rm
33.15.Vb
33.20.Bx
68.35.Rh
Opis:
The paper complements our earlier NMR investigation of molecular dynamics of tert-butyl chloride restricted by geometries of the type MCM-41 and CPG by the new sizes of CPG and by differential scanning calorimetry method. We report proton and deuteron NMR lineshapes and the spin-lattice relaxation results of tert-butyl chloride in CPG of the 15.6 nm and 7.4 nm pore diameter in the temperature range 70 K≤ T≤ 292 K. The bulk-like component of the confined tert-butyl chloride, in temperatures corresponding to phase III, is interpreted as a composition of two dynamically different subphases. The parameters of motions of both subphases are derived. The tert-butyl group motion in both subphases is more restricted than in the bulk tert-butyl chloride, although the activation energies are lower. Differential scanning calorimetry was used to determine temperatures of the phase transitions (140 K≤T≤292 K). The results show that the depression of the phase transition temperature is pore size dependent and that the confinement has less influence on transition to the plastic phase than on the freezing and on the solid II - solid III transition.
Źródło:
Acta Physica Polonica A; 2005, 108, 2; 357-370
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 113

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