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Wyświetlanie 1-15 z 138
Tytuł:
Hydrogen in InP-Bonding and Passivation
Autorzy:
Baranowski, J.
Tatarkiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1879967.pdf
Data publikacji:
1991-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.70.Rj
71.55.-i
31.20.Rx
Opis:
A tight-binding total energy calculation shows that the possible hydrogen-indium bond in InP is long and weak whereas hydrogen-phosphorus bond is short and strong. The model explains the known experimental data, especially the lack of local vibrational modes of InH in InP implanted with protons and hydrogen passivation of acceptors but not donors in InP.
Źródło:
Acta Physica Polonica A; 1991, 79, 2-3; 263-265
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanism of Thermal Interaction of In with GaAs
Autorzy:
Barcz, A.
Adamczewska, J.
Baranowski, J. M.
Kwiatkowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/1929763.pdf
Data publikacji:
1993-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.40.Ns
Opis:
General behavior of In/GaAs couple heat-treated at 570°C for 2 hours was studied with secondary-ion-mass spectrometry, scanning electron microscopy, Rutherford backscattering spectroscopy and Nomarski microscopy. It is shown that, besides the well-known InGaAs crystallites which epitaxially grow upon dissolution of the substrate, In interacts with the substrate dislocations to form In(Ga)As dendrites. The driving force for this process is presumably excess arsenic reported to be present in the vicinity of the individual dislocations.
Źródło:
Acta Physica Polonica A; 1993, 84, 4; 801-803
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On GaN Crystallization by Ammonothermal Method
Autorzy:
Dwiliński, R.
Baranowski, J. M.
Kamińska, M.
Doradziński, R.
Garczyński, J.
Sierzputowski, L.
Powiązania:
https://bibliotekanauki.pl/articles/1950744.pdf
Data publikacji:
1996-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.10.Dn
Opis:
GaN crystals are grown using ammonothermal method at pressures below 5 kbar and temperatures below 550°C. In this method, GaN is synthesised from high purity metallic gallium. The main role in the low temperature GaN crystallization is played by the chemically active and dense ammonia and dissolved mineralizer. Morphology of the obtained crystals as well as solubility experiments prove that gallium nitride is dissolved and crystallised from solution. Physical properties of GaN crystals obtained using ammonothermal method depend on the growth conditions and the type of mineralizer. All GaN samples reveal very intensive photoluminescence, also at room temperature. The spectra of crystals grown with lithium compound mineralizer are shifted towards higher energies in comparison to crystals grown with potassium based mineralizer. At helium temperatures, phosphorescence is also observed.
Źródło:
Acta Physica Polonica A; 1996, 90, 4; 763-766
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GaN Synthesis by Ammonothermal Method
Autorzy:
Dwiliński, R.
Wysmołek, A.
Baranowski, J.
Kamińska, M.
Doradziński, R.
Garczyński, J.
Sierzputowski, L.
Jacobs, H.
Powiązania:
https://bibliotekanauki.pl/articles/1933907.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.10.Dn
Opis:
It is shown that ammonothermal method can be successfully used to synthesize GaN powder of good crystallographic quality from ammonia solution at high pressure and a moderate temperature. The size of obtained GaN powder grains was of a few micrometers. The improvement of the powder crystalline quality (examined by X-ray rocking curve, scanning electron microscopy and luminescence measurements) with increasing molar proportion of mineralizer was observed. It was therefore possible to conclude that high molar proportion of mineralizer in ammonia solution plays a crucial role in the polycrystal growth process. Visible luminescence of high efficiency from the GaN powder was found.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 833-836
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crystallographic Properties of Bulk GaN Crystals Grown at High Pressure
Autorzy:
Leszczyński, M.
Grzegory, I.
Bockowski, M.
Jun, J.
Porowski, S.
Jasiński, J.
Baranowski, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/1933847.pdf
Data publikacji:
1995-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Dd
61.50.Cj
Opis:
Gallium nitride bulk crystals grown at about 15 kbar and 1500 K have been examined by using the high resolution X-ray diffractometry. An analysis of a set of the rocking curves of various Bragg reflections enabled us to estimate a dislocation density. For the crystals of dimensions lower than about 1 mm it is lower than 10$\text{}^{-5}$ cm$\text{}^{-2}$. For bigger samples the crystallographic quality worsens. With an application of the reciprocal lattice mapping we could distinguish between internal strains and mosaicity which are both present in these crystals The results for the bulk crystals are compared with those for epitaxial layers.
Źródło:
Acta Physica Polonica A; 1995, 88, 4; 799-802
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tire rubber testing procedure over a wide range of strain rates
Autorzy:
Baranowski, P.
Janiszewski, J.
Małachowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/279375.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
tire rubber
uniaxial compression test
SHPB test
strain rates
spectral analysis
Opis:
The main aim of the paper is to present the procedure allowing one to determine correct mechanical characteristics of a rubber material compressed within a wide range of strain rates. In order to obtain a satisfactory wide spectrum of material data, a number of tests were conducted both under low and high strain rates with the use of a universal strength machine and split Hopkinson pressure bar set-up equipped with polymethyl methacrylate and 7075- T6 alloy bars. During the investigations, the necessity of performing pre-compression tests and the problem of specimen geometry were pointed out as key methodical requirements to guarantee achieving valid experimental data both from quasi-static and high strain rate tests.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 2; 727-739
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bezszczotkowa wysokomomentowa zakrętarka elektromechaniczna
Brushless electric torque tool
Autorzy:
Gawron, S.
Baranowski, J.
Piątek, P.
Ossa, J.
Powiązania:
https://bibliotekanauki.pl/articles/1367885.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
zakrętarka elektryczna
napęd elektryczny
silnik bezszczotkowy
electric torque tool
electric drive
brushless motor
Opis:
Paper includes a presentation of research and development activities regarding an electric torque tool driven by brushless motor. Work is realised by two research institutions (KOMEL and AGH-UST) and an industrial partner (ZBM OSSA). The consortium plans to develop a new type of electric torque tool, which will be used for tightening nuts in joints with torque set from 2000 to 15000 Nm. New tool will be able to operate in highly dust-laden environments and also those with heightened safety requirements, where conventional torque tools driven by commonly universal motors can not be used.
W publikacji zawarto opis prac badawczo rozwojowych, jakich podjęły się dwa ośrodki badawcze (KOMEL i AGH) oraz przedsiębiorca (ZBM OSSA), w celu skonstruowania wysokomomentowej zakrętarki elektromechanicznej napędzanej silnikiem bezszczotkowym. Partnerzy konsorcjum planują opracować nowy typ zakrętarki, która ma służyć do dokręcania śrub w połączeniach z zadanym momentem od 2 000 do 15 000 Nm. Nowa zakrętarka będzie mogła pracować w środowiskach wysoko zapylonych i o zwiększonych wymaganiach bezpieczeństwa, gdzie nie można zastosować zakrętarek napędzanych silnikami komutatorowymi, które są obecnie standardem.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2015, 2, 106; 113-116
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Plasma Focus discharges in the PF-360 facility with additional D2 gaspuffed targets
Autorzy:
Stanislawski, J.
Baranowski, J.
Sadowski, M.
Zebrowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/147013.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
current sheath
deuteron beams
gas puffing
neutron yield
plasma focus
Opis:
The paper describes experimental studies of Plasma-Focus (PF) discharges carried out within the modernized PF- 360 facility, which was operated with an additional D2-gas puffing into the region of the collapsing current sheath and PF pinch formation, i.e. into space in front of the electrode outlet. The main aim of these studies was to increase a neutron yield from PF discharges by using fast deuteron beams, which are usually emitted from a pinch column and which can interact with additional D2-gas target.
Źródło:
Nukleonika; 2001, 46, suppl. 1; 73-75
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Raman Studies of Defects in Graphene Grown on SiC
Autorzy:
Grodecki, K.
Bożek, R.
Borysiuk, J.
Strupinski, W.
Wysmolek, A.
Stępniewski, R.
Baranowski, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/2047919.pdf
Data publikacji:
2011-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.48.Gh
78.30.Fs
Opis:
The Raman scattering studies of multi-layer graphene obtained by high temperature annealing of carbon terminated face of 4H-SiC(000-1) substrates are presented. Intensity ratio of the D and G bands was used to estimate the average size of the graphene flakes constituting carbon structures. The obtained estimates were compared with flake sizes from atomic force microscopy data. We found that even the smallest structures observed by atomic force microscopy images are much bigger than the estimates obtained from the Raman scattering data. The obtained results are discussed in terms of different average flake sizes inside and on the surface of the multi-layer graphene structure, as well as different type of defects which would be present in the investigated structures apart from edge defects.
Źródło:
Acta Physica Polonica A; 2011, 119, 5; 595-596
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Blast wave and suspension system interaction - numerical approach
Autorzy:
Baranowski, P.
Małachowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/247125.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
suspension system
pressure wave
SPH
ALE
FE modeling
Opis:
The main aim of this paper is to present the effective example of coupled experimental and numerical tests. Moreover, a development process of a numerical model of a terrain vehicle suspension system is presented. Experimental tests were carried out on the machine Instron 8802 with an assistance of the high-speed camera Phantom v12. Obtained stress-strain curves were applied into the FE model to estimate material constants for Mooney-Rivlin constitutive rubber model and for numerical failure criterion. Geometry of the tire and other suspension elements were achieved using reverse engineering technology. Due to the fact that a tire is such a complex structure to be represented with numerical methods, it was important to develop a discrete model of tire as much similar to the real one as possible. Consequently, an exact tire cords pattern was implemented into the FE model of the tire, which was obtained by the assistance of a microscope and X-ray device. In the next step, numerical analyses were performed simulating the TNT explosion under the suspension system with a simplified motor-car body. Nonlinear dynamic simulations were carried out using the explicit LS-Dyna code, with central difference scheme with modified the time integration of the equation of motion. In order to simulate the blast wave propagation the Smoothed Particle Hydrodynamics (SPH) method and Arbitrary Lagrangian-Eulerian formulation with Jones Wilkins Lee (JWL) equation defining the explosive material were used. Finally, results from both approaches were compared.
Źródło:
Journal of KONES; 2011, 18, 2; 17-24
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some Optical and Epr Properties of Strain-Free GaN Crystals Obtained by Ammono Method
Autorzy:
Dwiliński, R.
Baranowski, J. M.
Kamińska, M.
Doradziński, R.
Garczyński, J.
Sierzputowski, L.
Palczewska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1968061.pdf
Data publikacji:
1997-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.10.Dn
Opis:
AMMONO GaN is grown spontaneously from ammonia solution in form of regular, well shaped, few micrometer crystals. Photoluminescence spectra of these crystals are characterized by fixed positions of very narrow exciton lines (FWHM down to 1 meV), where free excitons A, B, C, resolved two donor bound excitons and acceptor bound exciton are visible. Fixed position of exciton lines is in contrast to small changes of line energies which have been always observed for epitaxial GaN layers because of strain present in them. Free electron concentration of AMMONO GaN is less than few times 10$\text{}^{15}$ cm$\text{}^{-3}$, as estimated from EPR signal of shallow donor. The above-mentioned facts qualified these crystals as state of the art strain-free, model material for basic parameter measurements of GaN. In this work, results of PL and EPR measurements performed on AMMONO GaN crystals are presented and discussed.
Źródło:
Acta Physica Polonica A; 1997, 92, 4; 737-741
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transport Properties of Disordered Graphene Layers
Autorzy:
Gryglas-Borysiewicz, M.
Jouault, B.
Tworzydło, J.
Lewińska, S.
Strupiński, W.
Baranowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1791293.pdf
Data publikacji:
2009-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.21.Ac
72.20.Fr
73.43.Qt
73.63.Bd
Opis:
Samples consisting of a few layers of graphene obtained by thermal decomposition of SiC were studied by means of transport experiments at 4 K and in a magnetic field up to 7 T. Transport data show that the samples have a two-dimensional character. Magnetoresistance has an approximately linear character at high magnetic fields, which has been previously observed in graphite samples, and a negative magnetoresistance, at low magnetic fields. The transverse resistivity $ρ_{xy}$ is nonlinear as a function of B, which can be described using a many-carrier model.
Źródło:
Acta Physica Polonica A; 2009, 116, 5; 838-840
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrophobic-Like Solvation in Non-Aqueous Solutions: Positron Annihilation in and Compressibility of Tert-butanol and Tetramethylurea in Ethylene Glycol
Autorzy:
Jerie, K.
Baranowski, A.
Gliński, J.
Przybylski, J.
Powiązania:
https://bibliotekanauki.pl/articles/2024269.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Em
78.70.Bj
Opis:
The pioneer experimental results of positron annihilation experiments in non-aqueous solutions of tetramethylurea and tert-butanol were compared to those of ultrasonic velocity. For tert-butanol, the positron annihilation results exclude existence of hydrophobic-like interactions and formation of weak, labile crystalline-like solvates in solution. For tetramethylurea solute the changes of annihilation parameters with concentration are minor and only limited conclusions can be drawn on this system, while they are stronger for tert-butanol solute. However, all the above is consistent with an assumption that the more hydrophobic solute (tert-butanol) should affect the original glycol structure stronger than that interacting with glycol via hydrogen bondings only. On the other hand, the ultrasonic data for the systems tested, although very precise, hardly confirm formation of any specific structure. It is possible, however, that the solvates do not differ in their compressibility from the pure liquids, and/or are formed only in very small amounts. Thus, usefulness of the positron annihilation method in investigation of liquid structure was proven.
Źródło:
Acta Physica Polonica A; 2001, 99, 3-4; 385-392
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GaSb Dots Grown on GaAs Surface by Metalorganic Chemical Vapour Deposition
Autorzy:
Bożek, R.
Babiński, A.
Baranowski, J. M.
Stępniewski, R.
Klusek, Z.
Olejniczak, W.
Starowieyski, K.
Wróbel, J.
Powiązania:
https://bibliotekanauki.pl/articles/1934054.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Gh
68.55.-a
Opis:
We report metaloorganic chemical vapour deposition growth of an anisotropic GaSb islands on GaAs (001) surface with a typical dimensions around 200 nm. Results of investigations employing scanning electron microscope, scanning tunnelling microscope and ph9tocapacitance are presented.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 974-976
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric Function Theory Calculations of Polaritons in GaN
Autorzy:
Korona, K. P.
Stępniewski, R. Stępniewski
Baranowski, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/1968249.pdf
Data publikacji:
1997-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.66.Fd
71.36.+c
Opis:
Properties of polaritons (free excitons coupled with photons of similar energy) in gallium nitride are investigated by performing calculations based on dielectric function theory including all three excitons A, B and C (characteristic for the wurtzite structure). Moreover the excited states of excitons have been taken into account by adding Elliott's components to dielectric function. Energies, polarizabilities and damping constants of excitons are determined. It is shown that due to inter-exciton interactions the B and C excitons are strongly damped. It is estimated that the characteristic time of B to A relaxation is t$\text{}_{BA}$=1 ps. The exciton C lifetime is estimated τ$\text{}_{C}$=0.2 ps.
Źródło:
Acta Physica Polonica A; 1997, 92, 5; 867-870
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 138

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