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Wyświetlanie 1-15 z 38
Tytuł:
Resonant Phonons in Adsorbates
Autorzy:
Dobrzynski, L.
Djafari Rouhani, B.
Zieliński, P.
Akjouj, A.
Sylla, B.
Oumghar, E.
Powiązania:
https://bibliotekanauki.pl/articles/1943987.pdf
Data publikacji:
1996-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.JS
68.45.-v
Opis:
After a brief review on surface phonons, we focus on resonant phonons in adsorbed thin layers. Such resonances may in general be understood within the substrate bulk band as thin layer modes shiften and broaden by the interaction with the substrate phonons. These resonant phonons appear as well-defined peaks in the phonon density of states. Their experimental study started recently by Helium atom scattering spectroscopy. This review will end by a prospective revue done mostly after the presentation of two unpublished results. First the slab resonant phonons may almost be confined in the surface slab even for frequencies falling within the bulk phonon band, if the surface slab is separated from the substrate by a buffer layer. The other prospective unpublished result deals with a model system in which the propagating phonons reach a space point from which they can continue to propagate through two different finite in space channels before reaching again a homogeneous uniform path. Such a system exhibits some frequencies for which the transmission factor vanishes. This phenomenon is related to the resonances associated with the finite additional path offered to the propagation of the phonons.
Źródło:
Acta Physica Polonica A; 1996, 89, 2; 139-144
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formation of a Complete Electron Transfer State of 9,9-Bianthryl in a Polar Solvent
Autorzy:
Nishiyama, K.
Honda, T.
Okada, T.
Powiązania:
https://bibliotekanauki.pl/articles/1993201.pdf
Data publikacji:
1998-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.40.Js
82.50.Fv
0.5.40.+j
71.35.Lk
Opis:
It has been generally recognized that excited 9,9'-bianthryl in polar solvents achieves a partial charge-separation state, instead of a complete electron transfer state, even in high-polarity solvents like acetonitrile at room temperature. However, here we firstly found that 9,9'-bianthryl reaches the complete electron transfer state in a polar alkanenitrile solvent at lower temperature as elucidated by means of transient absorption and steady-state fluorescence spectroscopy. A stepwise increase in the fluorescence Stokes shift observed when temperature was reduced implies a formation of a state more polar than that dominated at the room temperature. At low temperature (165 K), the transient absorption spectra of 9,9'-bianthryl in butyronitrile gradually changed from the spectrum ascribed to the partial change-separation state toward that of the complete electron transfer state. We suggest that at low temperature, due to the increase in the solvent polarity, the energetically stabilized electron transfer state should be predominant.
Źródło:
Acta Physica Polonica A; 1998, 94, 5-6; 847-856
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solvent-Dependent Quenching of the Lowest Excited Singlet State of 9,10-Dibromoanthracene by Ground-State 2,5-Dimethylhexa-2,4-Diene Yielding 9-Bromoanthracene or the [4+2] Adduct
Autorzy:
Nagahara, T.
Nakayama, T.
Hamanoue, K.
Powiązania:
https://bibliotekanauki.pl/articles/1992713.pdf
Data publikacji:
1998-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.40.Js
82.50.Fv
Opis:
Irrespective of the dielectric constant (ε) or the hydrogen-bonding ability of a pure solvent, the lowest excited singlet state (DBA*) of 9,10-dibromoanth racene (DBA) is quenched by ground-state 2,5-dimethylhexa-2,4-diene (DMHD) giving rise to the appearance of an exciplex emission. By means of sub-picosecond and nanosecond laser photolysis as well as steady-state photolysis, however, the following solvent-dependent results are obtained; (1) in acetonitrile (ε=37.5) and acetone (ε=20.7), an exciplex (DBA-DMHD)* formed between DBA* and DMHD generates the DBA radical anion (DBA$\text{}^{•-+}$) as an intermediate for formation of 9-bromoanthracene (BA) from DBA; (2) in ethanol (ε=24.6), 2-propanol (ε=19.9), 1-octanol (ε=10.3), diethyl ether (ε=4.34), and heptane (ε=1.92), a neutral radical species (NR$\text{}^{•}$) generated by decomposition of (DBA-DMHD)* (or by a reaction of DBA* with DMHD) is an intermediate for formation of a dibenzobicyclo[2.2.2]octadiene-type compound (a [4+2] adduct); (3) both DBA$\text{}^{•-}$ and NR$\text{}^{•}$ are generated in methanol (ε=32.7) but the rate (v) of BA formation upon steady-state photolysis of DBA in the presence of 1 M DMHD decreases in the order of v(acetonitrile, ε=37.5) > v(acetone, ε=20.7) > v(methanol, ε=32.7). It thus can be concluded that the mechanism of exciplex decomposition and the reaction of DBA* with DMHD are affected by not only the dielectric constant of a pure solvent but also its hydrogen-bonding ability.
Źródło:
Acta Physica Polonica A; 1998, 94, 4; 701-713
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technologia implementacji systemu obrotu i zarządzania nieruchomościami
Implementation technology of real estate management and turnover system
Autorzy:
Rączka, K.
Kowalski, M.
Gąsiorek, S.
Powiązania:
https://bibliotekanauki.pl/articles/289603.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
nieruchomość
system informatyczny
architektura wielowarstwowa
diagram encji
techniczny schemat bazodanowy
XML
J2EE
servlet
JSP
JS
ERD
SMD
real estate
computer system
multilayer architecture
server model diagram
entity relationship diagram
Opis:
Praca opisuje technologię implementacji systemu obrotu i zarządzania nieruchomościami. Poświecony jest on zarówno zagadnieniom teoretycznym jak i praktycznym aspektom budowy systemów wielowarstwowych ze szczególnym naciskiem na dynamikę oraz rozszerzalność projektu uzyskaną poprzez przejrzystą modularną strukturę, szerokie stosowanie rozwiązań konfiguracyjnych oraz wysoką parametryzowalność systemu. Ważnym celem projektowym jest również przenaszalność rozwiązania uzyskana poprzez stosowanie uznanych standardów.
The document describes architecture, analysis, technical design and implementation technology of the real estate management and turnover system. It is dedicated to both theoretical and practical aspects of the development of multilayer systems, putting an emphasis on the system's dynamics and extensibility, achieved by clear modular structure, wide usage of configuration mechanisms and high parameterization of the system. Another important design goal was to gain high portability of solution, achieved by usage of open standards.
Źródło:
Inżynieria Rolnicza; 2006, R. 10, nr 11(86), 11(86); 377-385
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Acoustic Wave Propagation in a Power Transformer Model
Autorzy:
Wotzka, D.
Boczar, T.
Zmarzły, D.
Powiązania:
https://bibliotekanauki.pl/articles/1807760.pdf
Data publikacji:
2009-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.80.-s
43.28.Js
Opis:
Analyses of acoustic wave propagation in a model power transformer are presented in the paper. The acoustic wave is induced by partial discharges that are simulated at predefined coordinates in the core and winding. Propagation of the numerical calculated acoustic wave is analyzed within the transient state. Achieved results indicate that the space and time distributions of the acoustic pressure depend on the induction position. Furthermore, a greater pressure gradient is observed in domains with higher speed of sound while the largest amplitude occurs at the vicinity of the induction position.
Źródło:
Acta Physica Polonica A; 2009, 116, 3; 428-431
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Application of the Selected Time-Frequency Descriptors Detection of the Acoustic Emission Signals Generated by Multisource Partial Discharges
Autorzy:
Cichon, A.
Powiązania:
https://bibliotekanauki.pl/articles/1795791.pdf
Data publikacji:
2009-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.80.-s
43.28.Js
Opis:
The paper presents the comparative analysis results of the acoustic emission signals generated by various forms of partial discharges occurring in multisource systems. Modern methods of the signal digital processing: a short-time Fourier transform and continuous and discrete wavelet transforms were applied for the assessment of the results in the time-frequency domain. The acoustic emission signals generated by partial discharges were registered with a WD AH17 contact transducer by the Physical Acoustics Corporation placed on the external part of the tub.
Źródło:
Acta Physica Polonica A; 2009, 116, 3; 290-293
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the Golden Numerical Rings for Configure Acoustic Systems of Fine Resolution
Autorzy:
Riznyk, W.
Powiązania:
https://bibliotekanauki.pl/articles/1504425.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.28.Js
Opis:
The paper presents a new mathematical principle for improving the quality indices of acoustic systems with non-uniform structure (e.g. overlapping masks utilizing the entire ultra-acoustic aperture) with respect to the wavelength scale, where each pair of holes serves as an interferometer selecting the signal component at a spatial frequency, using novel design based on the combinatorial sequencing theory, namely the concept of golden numerical rings. The concept can be used for finding optimal placement of structural elements in spatially distributed systems, for example, positioning of holes elements in sonar antenna array. Golden numerical rings are cyclic sequences of positive integers which form perfect partitions of a finite interval [1, S] of integers. The sums of connected sub-sequences of a GRB enumerate the set of integer [1, S] exactly R-times. These design techniques make it possible to configure non-redundant masks in order to avoid interference of signal components of the same spatial frequency because phases of the components are unknown.
Źródło:
Acta Physica Polonica A; 2011, 119, 6A; 1046-1049
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristic of Acoustic Signals Generated by Operation of On Load Tap Changers
Autorzy:
Cichon, A.
Fracz, P.
Zmarzly, D.
Powiązania:
https://bibliotekanauki.pl/articles/1493036.pdf
Data publikacji:
2011-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.80.-s
43.28.Js
Opis:
Possibilities of application of the acoustic method for the on load tab changers diagnosis has been presented in the paper. The analysis of measurement results gathered during research works performed under laboratory conditions has been presented in detail. The registered acoustic signals have been analyzed in time and time-frequency domains. The time domain analysis has been performed by presentation of time runs and their envelopes determined by use of the Hilbert transform. Evaluation of the time-frequency components has been performed by use of the short-time Fourier transform, the discrete and the continuous wavelet transforms.
Źródło:
Acta Physica Polonica A; 2011, 120, 4; 585-588
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The rapid prototyping of aircraft wheel hub model with the use of techniques JS, SLA, FDM
Autorzy:
Śliwa, R. E.
Budzik, G.
Bernaczek, J.
Dziubek, T.
Powiązania:
https://bibliotekanauki.pl/articles/245987.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
prototype
aircraft wheel hub
rapid prototyping
techniques JS
SLA
FDM
Opis:
Design work related to the implementation of new aerospace elements requires the use of 3D-CAD modelling techniques and rapid prototyping, which makes it possible to significantly accelerate the deployment of new solutions. The article presents the possibility of using some methods of rapid prototyping to produce the research model of a wheel hub forming part of the landing gear. Incremental rapid prototyping methods - JS (Jetting System), SLA (Stereolithography), FDM (Fused Depositing Modelling) - have been characterized with regard to the technology of executing a hub model, the parameters of the manufacturing apparatus, and comparing basic technical data of materials used in the analyzed processes. One of the elements of the process of prototyping was to process data in other equipment for rapid prototyping. This process consisted of the following steps: defining the parameters of model building, determining the appropriate model settings in the workspace of manufacturing equipment, editing the supporting structure, verifying the subsequent layers through the simulation of model building process, generating output numerical procedures for manufacturing equipment. Manufactured prototypes have been evaluated of dimensional accuracy with the use coordinate measuring machine. Also measured the surface roughness. Conducted studies were the basis to determine the applicability of various methods of rapid prototyping in the process of research and manufacturing aircraft wheel hub.
Źródło:
Journal of KONES; 2011, 18, 3; 439-443
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of Acoustic Emission Signals Generated by the Contacts of the Selector
Autorzy:
Cichoń, A.
Borucki, S.
Wotzka, D.
Szmajda, M.
Powiązania:
https://bibliotekanauki.pl/articles/1417945.pdf
Data publikacji:
2012-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.80.-s
43.28.Js
Opis:
An important part of electric power transformer is the on load tap changer which enables for voltage regulation in the network. Due to high level of failure frequency of these devices it is necessary to look for new diagnostic methods which enable for theirs technical state estimation under transformer normal operating condition. Presently at the Electric Power Institute at Opole University of Technology there are works in progress aspiring to determine the application possibility of the acoustic emission method for on load tap changer diagnosis. Results of scientifically-research works aiming to characterize the acoustic emission signals generated by a separated selector are presented in the paper. Measurements have been performed in a setup with a model of on load tap changer type VEL-110-27 from ELIN. Acoustic emission signals generated by the selector have been analyzed in detail. Analysis of the time-frequency components of signals generated by on load tap changer has been carried out with the short time Fourier transform and continuous wavelet transform. Based on the comparison outcome of acoustic emission signals generated by the power changer and by the selector two measuring paths endowed with wide band contact transducers have been proposed for the practical application.
Źródło:
Acta Physica Polonica A; 2012, 122, 5; 804-807
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Efficiency of Different Shapes of Homogeneous and Two-Part Piezo Elements on Vibration Reduction
Autorzy:
Trojanowski, R.
Wiciak, J.
Powiązania:
https://bibliotekanauki.pl/articles/1418045.pdf
Data publikacji:
2012-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.28.Js
43.40.-r
46.40.Ff
Opis:
The subject of this work is a numerical analysis of efficiency of different piezo element shapes and types used for vibration (and later structural sound) reduction. The shapes of both types of piezo elements used are as follows: square, right-angled triangle, and parallelogram. There are 2 types of piezo elements used in this study: homogeneous elements and elements consisting of 2 parts (inner and outer) of different composition. These are attached to steel plate clamped on all sides. For every simulation 5 elements are used as actuators, with 1 as disturbance source, and other 4 as active dampers. On the other side of a plate 4 elements are placed acting as vibration sensors. The actuator used as a disturbance source as well as sensors are always in the shape of a square. 4 modes were taken into account (analyzed each one singular and all together). Analyses were made with the use of ANSYS software.
Źródło:
Acta Physica Polonica A; 2012, 122, 5; 905-907
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Location of Processor Allocator and Job Scheduler and Its Impact on CMP Performance
Autorzy:
Zydek, D.
Chma, G.
Shawky, A.
Selvaraj, H.
Powiązania:
https://bibliotekanauki.pl/articles/227230.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CMP
PA
JS
energy
assignment
Opis:
High Performance Computing (HPC) architectures are being developed continually with an aim of achieving exascale capability by 2020. Processors that are being developed and used as nodes in HPC systems are Chip Multiprocessors (CMPs) with a number of cores. In this paper, we continue our effort towards a better processor allocation process. The Processor Allocator (PA) and Job Scheduler (JS) proposed and implemented in our previous works are explored in the context of its best location on the chip. We propose a system, where all locations on a chip can be analyzed, considering energy used by Network-on-Chip (NoC), PA and JS, and processing elements. We present energy models for the researched CMP components, mathematical model of the system, and experimentation system. Based on experimental results, proper placement of PA and JS on a chip can provide up to 45% NoC energy savings.
Źródło:
International Journal of Electronics and Telecommunications; 2012, 58, 1; 9-14
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
11 lat współpracy Związku Strzeleckiego w Tomaszowie Lubelskim ze Strażą Graniczną w regionie
11 Years of Collaboration Between the Riflemens Association in Tomaszów Lubelski and the Border Guard in the Region
Autorzy:
Markowicz, Mateusz
Powiązania:
https://bibliotekanauki.pl/articles/38990167.pdf
Data publikacji:
2013
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
Strzelec
Straż Graniczna
JS 2019
Tomaszów Lubelski
współpraca
Shooter
Border Guard
2019 Shooting Unit
collaboration
Opis:
Artykuł składa się z trzech części. W pierwszej części opisana została geneza ruchu strzeleckiego, historia Związku w dwudziestoleciu między wojennym oraz dzieje powojenne „Strzelca”. W drugiej części przedstawiona została historia Jednostki Strzeleckiej 2019 im. gen. Tadeusza Piskora w Tomaszowie Lubelskim. W części trzeciej zaprezentowano współpracę Jednostki Strzeleckiej z Placówkami Straży Granicznej w regionie działalności Jednostki Strzeleckiej 2019.
The article is divided into three parts. Part one describes the origins of the shooting movement and the activities of the organization in the interwar and post-war periods. Part two recounts the operation of the General Tadeusz Piskor 2019 Shooting Unit from Tomaszow Lubelski. the last part tells of the collaboration between the Shooting Unit and the Border Guard.
Źródło:
Roczniki Wydziału Nauk Prawnych i Ekonomicznych KUL; 2012-2013, 8-9, 1; 395-415
1896-6365
Pojawia się w:
Roczniki Wydziału Nauk Prawnych i Ekonomicznych KUL
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 38

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