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Wyświetlanie 1-15 z 56
Tytuł:
Analysis of Gain-Switching in Two-Section Tapered Lasers
Autorzy:
Adamiec, P.
Tijero, J.
Esquivias, I.
Powiązania:
https://bibliotekanauki.pl/articles/1399150.pdf
Data publikacji:
2013-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.55.Px
42.55.Ah
07.05.Tp
Opis:
We analyze the gain-switching dynamics of two-section tapered lasers by means of a simplified three-rate-equation model. The goal is to improve the understanding of the underlying physics and to optimize the device geometry to achieve high power short duration optical pulses.
Źródło:
Acta Physica Polonica A; 2013, 124, 5; 888-890
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
WSN and RFID Integration to Support Intelligent Monitoring in Smart Buildings Using Hybrid Intelligent Decision Support Systems
Autorzy:
Alshahrany, F.
Abbod, M.
Moualek, I.
Powiązania:
https://bibliotekanauki.pl/articles/1401951.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.05.Tp
Opis:
The real time monitoring of environment context aware activities is becoming a standard in the service delivery in a wide range of domains (child and elderly care and supervision, logistics, circulation, and other). The safety of people, goods and premises depends on the prompt reaction to potential hazards identified at an early stage to engage appropriate control actions. This requires capturing real time data to process locally at the device level or communicate to backend systems for real time decision making. This research examines the wireless sensor network and radio frequency identification technology integration in smart homes to support advanced safety systems deployed upstream to safety and emergency response. These systems are based on the use of hybrid intelligent decision support systems configured in a multi-distributed architecture enabled by the wireless communication of detection and tracking data to support intelligent real-time monitoring in smart buildings. This paper introduces first the concept of wireless sensor network and radio frequency identification technology integration showing the various options for the task distribution between radio frequency identification and hybrid intelligent decision support systems. This integration is then illustrated in a multi-distributed system architecture to identify motion and control access in a smart building using a room capacity model for occupancy and evacuation, access rights and a navigation map automatically generated by the system. The solution shown in the case study is based on a virtual layout of the smart building which is implemented using the capabilities of the building information model and hybrid intelligent decision support system.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-152-B-159
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance analysis of CoS of bridged WorldFIP and ATM networks for real time communication
Autorzy:
Aydogan, T.
Ozcelik, I.
Erturk, I.
Ekiz, H.
Powiązania:
https://bibliotekanauki.pl/articles/1070442.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
01.20.+X
07.05.TP
Opis:
The implementation of the remote control, monitoring and maintenance of industrial automation systems based on real-time criteria is becoming more difficult as the distance increases. ATM is an important transport, switching, network management and backbone technology that offers different solutions to real-time communication with different classes of service. In this study, the effects on real-time communication of AAL 3/4 and AAL 5 classes of service of ATM were researched on a model in which the communication between WorldFIP industrial network nodes and ATM network nodes was provided over a bridge. First, a communication system consisting of a WorldFIP network, ATM network and bridge were modeled on a simulation tool and implemented. Afterwards, the system performance was analyzed under different loads within the classes of service AAL 3/4 and AAL 5. The analysis results have indicated that compared to AAL 5, AAL 3/4 better satisfies the real-time communication criteria. This result has shown that in both real-time access to a remote industrial automation systems and communication among remote industrial automation systems, ATM is preferable as a backbone and AAL 3/4 as the class of service.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 412-416
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Use of 3D Modeling in the Diagnosis of Power Capacitors with Acoustic Emission Method
Autorzy:
Boczar, T.
Błachowicz, A.
Borucki, S.
Zmarzły, D.
Powiązania:
https://bibliotekanauki.pl/articles/1417933.pdf
Data publikacji:
2012-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.40.Le
07.05.Tp
Opis:
The article presents the issue modelling the partial discharge phenomenon in engineering and scientific environments using hardware-based computer cluster. The authors present the results of research work on the phenomenon of acoustic emission from partial discharge occurring in power capacitors for power factor correction. The work includes the issues presentation and explanation of solutions enabling to create 3D spatial model of power capacitor. The authors proposed a simplified model of an acoustic test object aimed at improving the process of calculating the results.
Źródło:
Acta Physica Polonica A; 2012, 122, 5; 796-799
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-Luminous Flame Temperature Determination Method Based on $CO_{2}$ Radiation Intensity
Autorzy:
Cięszczyk, S.
Powiązania:
https://bibliotekanauki.pl/articles/1377538.pdf
Data publikacji:
2014-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.07.Df
07.57.Ty
33.20.Ea
07.05.Tp
Opis:
A new method for estimating the temperature of non-luminous flames is presented. The spectral radiation intensity emitted from uniform or temperature-axisymmetric $CO_{2}$ gas is simulated. A new inversion scheme that utilizes intensity ratios instead of directly spectral intensities is applied. This technique eliminates the errors caused by inaccuracies in the absolute radiation intensity that result from both calibration and on-site measurement. For example, this situation can occur when a spectrometer acquires radiance within only a part of its field of view. Neural networks are used as inverse models. The proposed inversion approach shows good results with simulated data. The analysis of example measured emission spectra from practical flames is also demonstrated.
Źródło:
Acta Physica Polonica A; 2014, 126, 6; 1235-1240
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Passive Open-Path FTIR Measurements and Spectral Interpretations for in situ Gas Monitoring and Process Diagnostics
Autorzy:
Cięszczyk, S.
Powiązania:
https://bibliotekanauki.pl/articles/1204927.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.07.Df
07.57.Ty
33.20.Ea
07.05.Tp
Opis:
This article aims to present the possibilities for the passive spectral measurements and qualitative interpretations of inside-the-object gases. The basic features and applications of open-path Fourier transform infrared spectroscopy for measuring atmospheric and process exhaust gases are discussed. Methods for modelling and interpreting the spectra used for in situ measurements are presented. As an example, a spectrum simulation was investigated using $CO_2$, a gas present in substantial quantities in various exhaust gases. The spectrum varied significantly with temperature allowing its use for diagnostics purposes. Thus, examples of measurements made using passive transmission with a heated object as a radiation source are presented. A baseline correction procedure was necessary to obtain a transmission (or absorbance) spectrum. The gas content and temperature were determined based on these measurements.
Źródło:
Acta Physica Polonica A; 2014, 126, 3; 673-678
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study of evaluation of solar energy simulation and modeling systems
Autorzy:
Er, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1070387.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.05.Tp
07.05.Bx
07.05.Kf
Opis:
In the solar energy application, there are several obstacles during the design of projects. The investors are still enforcing with deliberately carrying out the right and feasible project decision. In this point simulation techniques have been emerging their indispensable importance. Thereby the simulation can be used as an adaptive purpose not only during the design process of a plant but also for the existing plants efficacy while determining operational condition of solar system on a daily basis by probabilistic methods due to random characteristics of the meteorological data. This study mainly consists two parts. The first part of this study overarches the review of existing software tools and models which are reachable at the preparation time of this study. Then the reviewed software tools and models were classified briefly in the figures. The second part of the study outlines the developed new code in C# computer programming language for the solar calculations. The results which were obtained framed the developed code, were evaluated with the convenient existing software tools and models for assessment of their correlation and also the results were demonstrated with graphs for their utilization. Consequently the software systems were enlightened that are mostly used in scientific projects including solar software simulation packages and modeling background together with comparison of separate or combined PV software programs by their field of application which would bolster further research studies.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 72-77
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Entropy Based Trees to Support Decision Making for Customer Churn Management
Autorzy:
Gajowniczek, K.
Orłowski, A.
Ząbkowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/1398869.pdf
Data publikacji:
2016-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.Tp
05.40.Ca
07.05.Kf
07.05.Mh
Opis:
In this work we analyze empirically customer churn problem from a physical point of view to provide objective, data driven and significant answers to support decision making process in business application. In particular, we explore different entropy measures applied to decision trees and assess their performance from the business perspective using set of model quality measures often used in business practice. Additionally, the decision trees are compared with logistic regression and two machine learning methods - neural networks and support vector machines.
Źródło:
Acta Physica Polonica A; 2016, 129, 5; 971-979
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Q-Entropy Approach to Selecting High Income Households
Autorzy:
Gajowniczek, K.
Karpio, K.
Łukasiewicz, P.
Orłowski, A.
Ząbkowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/1388367.pdf
Data publikacji:
2015-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.Tp
05.40.Ca
07.05.Kf
07.05.Mh
Opis:
A generalized algorithm for building classification trees, based on Tsallis q-entropy, is proposed and applied to classification of Polish households with respect to their incomes. Data for 2008 are used. Quality measures for obtained trees are compared for different values of q parameter. A method of choosing the optimum tree is elaborated.
Źródło:
Acta Physica Polonica A; 2015, 127, 3A; A-38-A-44
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Anatomic Structure of Pulmonary Arteries as a Source of Unreliability in Thermodilution Cardiac Output Measurement
Autorzy:
Gawlikowski, M.
Pustelny, T.
Przywara-Chowaniec, B.
Struk, P.
Powiązania:
https://bibliotekanauki.pl/articles/1811516.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
47.63.Cb
07.05.Tp
87.19.Uv
Opis:
One of the most fundamental examination in intensive care medicine is cardiac output measurement, realized by pulmonary artery catherization. The thermodilution cardiac output estimation method is not resistant to various kinds of disturbances, which significantly decreases its sensitivity and specificity. The paper depicts investigations related to analysis of presumable new source of unreliability - asymmetric blood flow through pulmonary vessels. The investigations consisted of two phases: clinical examination (to obtain anatomical data) and computer modeling (to simulate the flow symmetry).
Źródło:
Acta Physica Polonica A; 2008, 114, 6A; A-81-A-89
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of Phonon Confinement Model in Simulation οf Raman Spectra of Nanostructured Materials
Autorzy:
Grujić-Brojčin, M.
Šćepanović, M.
Dohcević-Mitrović, Z.
Popović, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1807810.pdf
Data publikacji:
2009-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Wx
78.30.-j
63.22.-m
07.05.Tp
Opis:
The simulation of the Raman spectra of nanostructured materials, where the effects of frequency shift and asymmetric broadening of the Raman modes play an important role, can be very useful in systematic characterization of these materials. Use of phonon confinement model for calculating Raman spectra of different nanomaterials is considered both from the viewpoint of different confinement function and the confinement strength, as well as the dimensionality of the confinement model. The phonon dispersion relations and the choice of their approximation are also studied. The influence of particle size distribution on the shape of the calculated spectra is discussed and contributions of Gaussian and asymmetric Gaussian distribution are compared. The effects of average and inhomogeneous strain on the behavior of simulated Raman spectra are also discussed. The results of the phonon confinement model are compared to the experimental spectra of $CeO_2$ and anatase $TiO_2$ nanopowders.
Źródło:
Acta Physica Polonica A; 2009, 116, 1; 51-54
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Digital Fabrication of Mathematical Models via Low-Cost 3D FDM Desktop Printer
Autorzy:
Gür, Y.
Powiązania:
https://bibliotekanauki.pl/articles/1401922.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
01.50.H-
02.60.Cb
07.05.Tp
81.20.Hy
Opis:
Additive manufacturing technology is developed throughout the 1980's and 1990's. This technology makes the realization of mathematical models much easier. The challenge focused is here to fabricate real objects from very complex mathematical models by using a low-cost 3D fused deposition modeling desktop printer. Thus this brings the intangible mathematical expressions to life. In this study it is illustrated that complex mathematical expressions are not only numbers and symbols but also they are real life objects. In the examples, some mathematical functions such as Möbius strip, Schwartz functions and their boundary conditions are introduced and then digitally fabricated. This work shows that how complex functional mathematical models that cannot be manufactured with classical engineering methods or very difficult to produce can be fabricated by using a 3D FDM desktop printer.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-100-B-102
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preisach Images of a Simple Mechanical System
Autorzy:
Gutowski, M.
Markovskyi, S.
Chyao, A.
Powiązania:
https://bibliotekanauki.pl/articles/1400188.pdf
Data publikacji:
2013-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.05.Tp
45.20.da
75.60.Ej
Opis:
This work is an an early stage of a larger project aiming at answering the question whether or not the Preisach map is really fingerprinting magnetic materials. More precisely, we are interested whether the Preisach model of magnetic hysteresis indeed contains any physics or is just a convenient modeling tool. To this extent we study a very simple mechanical system, thus fully tractable, subjected to the external force. Despite of its simplicity, our model captures all the fundamental features of real magnetic materials, namely their hysteretic behavior, coercivity, remanent magnetization, and saturation at high fields. Both the overall shape of major hysteresis loop as well as first order reversal curves are reproduced quite correctly; they are very similar to those observed in magnetic materials. The model essentially consists of a single, spring loaded, rigid and rotative bar with non-zero friction torque. The length of a projection of this bar onto the direction of an external force is identified with magnetization. The friction torque and the spring constant are the only freely adjustable parameters of our model. Here we investigate, and present, their influence on the inferred Preisach maps.
Źródło:
Acta Physica Polonica A; 2013, 123, 1; 13-15
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Preliminary Analysis of Wireless Link for Bats Signals Acquisition System
Autorzy:
Herman, K.
Debski, M.
Furmankiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1493212.pdf
Data publikacji:
2011-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
47.63.Cb
87.19.U-
07.05.Tp
Opis:
The scope of an article that is presented below covers a preliminary analysis of a wireless link of ultrasound signal transmission in commercial radio frequency band (UHF). The radio link is used to transmit short ultrasound bat-like biosonar signals. Because of complicated structure properties and of transmitted signals the various methods of wireless transmission are shown. The hardware implementation consists of micro-electro-mechanical system microphone, microphone preamplifier and FM transmitter. At the end of the radio link a standard FM receiver is used. Since we use frequency modulation an influence of the radio link on received signal parameters is presented. The analysis of results provides us a set of information that might be used in designing of large scale wireless sensor networks for bats behavior monitoring.
Źródło:
Acta Physica Polonica A; 2011, 120, 4; 635-638
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular Reorientations οf N-n-Hexyltetrachlorophthalimide Studied by $\text{}^1H$ NMR
Autorzy:
Hołderna-Natkaniec, K.
Jurga, K.
Woźniak-Braszak, A.
Walczak, A.
Powiązania:
https://bibliotekanauki.pl/articles/1538203.pdf
Data publikacji:
2010-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.05.Tp
31.15.E-
33.20.Ea
64.70.K-
76.60.-k
Opis:
The spin-lattice relaxation times $T_{1}$ and the second moment of $\text{}^{1}H$ NMR line have been employed to study the internal dynamics of protons of N-n-hexyl-tetra-chloro-phthali-mides in the temperature range 80-350 K. The model of internal reorientations has been proposed.
Źródło:
Acta Physica Polonica A; 2010, 117, 4; 537-548
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 56

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