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Tytuł:
Identification of unmeasured variables in the set of model constraints of the data reconciliation in a power unit
Autorzy:
Szega, M.
Nowak, G. T.
Powiązania:
https://bibliotekanauki.pl/articles/240163.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mathematical modeling
empirical characteristics
data reconciliation
modelowanie matematyczne
charakterystyka empiryczna
rachunek wyrównawczy
Opis:
In generalized method of data reconciliation as equations of conditions beside substance and energy balances can be used equations which don't have precisely the status of conservation lows. Empirical coefficients in these equations are traded as unknowns' values. To this kind of equations, in application of the generalized method of data reconciliation in supercritical power unit, can be classified: steam flow capacity of a turbine for a group of stages, adiabatic internal efficiency of group of stages, equations for pressure drop in pipelines and equations for heat transfer in regeneration heat exchangers. Mathematical model of a power unit was developed in the code Thermoflex. Using this model the off-design calculation has been made in several points of loads for the power unit. Using these calculations identification of unknown values and empirical coefficients for generalized method of data reconciliation used in power unit has been made. Additional equations of conditions will be used in the generalized method of data reconciliation which will be used in optimization of measurement placement in redundant measurement system in power unit for new control systems.
Źródło:
Archives of Thermodynamics; 2013, 34, 4; 235-245
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic radiation of vibrating plate structures submerged in water
Autorzy:
Nowak, Ł.
Zieliński, T. G.
Powiązania:
https://bibliotekanauki.pl/articles/331890.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
The paper presents results of the theoretical and numerical investigation on acoustic radiation of vibrating plate structures submerged in water. The current state of the art on the considered issues is briefly reviewed. Then, the method for determining eigenmode shape functions and eigenfrequencies of plate vibrating in water that has been used in presented study is introduced. The constitutive equations for solid domain and the pressure acoustic equation for liquid domain are coupled via boundary conditions and solved numerically using the finite element method. Structural mode shapes and eigenfrequencies computed for plate submerged in water are compared to analogous results obtained for air and for the in vacuo case. It is assumed, that the plate is rectangle shaped and that it is placed in an infinite rigid baffle. Three-dimensional near- and far-field acoustic radiation characteristics for the plate vibrating in water are introduced. Possibilities of implementation of the active control system for reduction of the hydroacoustic emission are briefly discussed.
Źródło:
Hydroacoustics; 2012, 15; 163-170
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimizing data transmission in communication systems which use magnetic couplings
Optymalizacja transmisji danych w systemach łączności wykorzystujących „sprzężenia magnetyczne”
Autorzy:
Jackiewicz, T.
Nowak, R.
Wiśniewski, G.
Powiązania:
https://bibliotekanauki.pl/articles/1361932.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
optymalizacja transmisji danych
sprzężenia magnetyczne
propagacja fal elektromagnetycznych
propagacja sygnału w szybie kopalnianym
górniczy system łączności
optimizing data transmission
magnetic couplings
propagation of electromagnetic waves
signal propagation in a shaft
mining communication system
Opis:
Communication systems which make use of magnetic couplings are systems in which the transformation of signals is conducted through induction elements. These elements transfer and receive energy from the transportation unit. A good example of such a solution is a shaft communication and signal system which sends a transmission signal through ferromagnetic couplers by means of head ropes or balancing ropes. This type of communication has, undoubtedly, some advantages, such as high reliability and uncomplicated exploitation. Yet, there are some limitations related to the employed bandwidth. The article discusses important issues related to shaft communication and presents methods which allow to make maximum use of available transmission channels.
Mianem łączności wykorzystującej sprzężenia magnetyczne przyjęto nazywać systemy, w których transformacja sygnału odbywa się poprzez elementy indukcyjne, które przekazują i odbierają energię z ośrodka transportującego. Dobrym przykładem takiego rozwiązania jest system łączności i sygnalizacji szybowej, który poprzez sprzęgacze ferromagnetyczne przesyła za pomocą lin nośnych bądź wyrównawczych sygnał transmisyjny. Tego typu łączność oprócz swych niewątpliwych zalet, jakimi są duża niezawodność i prostota eksploatacji, posiada również swoje ograniczenia związane z zastosowanym pasmem przenoszenia. W artykule przedstawione zostaną rozważania i pokazane metody pozwalające na maksymalne wykorzystanie dostępnych kanałów transmisyjnych.
Źródło:
Mining – Informatics, Automation and Electrical Engineering; 2015, 53, 3; 25-30
2450-7326
2449-6421
Pojawia się w:
Mining – Informatics, Automation and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Active vibroacoustic control of plate structures with arbitrary boundary conditions
Autorzy:
Nowak, Ł.
Zieliński, T. G.
Meissner, M.
Powiązania:
https://bibliotekanauki.pl/articles/31343106.pdf
Data publikacji:
2013
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
vibroacoustics
active control
plate vibrations
aktywne sterowanie
wibroakustyka
Opis:
The paper describes briefly some main aspects of the active feedback control system that has been developed and constructed for reduction of vibroacoustic emission of vibrating plate structures with arbitrary boundary conditions. Relations between the forms and frequency of the vibrations induced by an external harmonic excitation and the distribution of the generated acoustic pressure field are investigated using the developed numerical model based on indirect variational boundary element method. The aim of the control system is to minimize the sound pressure level in a given point of the ambient space. The system uses small, rectangle-shaped piezoelectric transducers as both sensors and actuators. The transducers are connected in a number of independent feedback loops, and the feedback gains are the control parameters which are optimized using the developed optimal control algorithm. The constructed active system has been tested for the stability and control performance during experimental research performed in an anechoic chamber. Results of experiments are presented in the paper, proving a high level of noise reduction and a good agreement with numerical predictions.
Źródło:
IPPT Reports on Fundamental Technological Research; 2013, 4; 5-9
2299-3657
Pojawia się w:
IPPT Reports on Fundamental Technological Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Pinning of the Fermi Level by Germanium A$\text{}_{1}^{0}\text{}^{/}\text{}^{+}$ Deep Donor State in GaAs Codoped with Ge and Te
Autorzy:
Słupiński, T.
Nowak, G.
Przybytek, J.
Stępniewski, R.
Powiązania:
https://bibliotekanauki.pl/articles/1929765.pdf
Data publikacji:
1993-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.Jv
Opis:
We present the possibility of GaAs:Ge,Te crystals growth from the melt (liquid encapsulated Czochralski method) with partially occupied, at ambient pressure, the A$\text{}_{1}$ localized electronic state of Ge$\text{}_{Ga}$ impurity. In as-grown crystals the amphotericity of Ge and creation of defects (deep acceptor complexes, precipitates etc.) during cooling after growth limit the free electron concentration below the value necessary to populate the A$\text{}_{1}^{0}\text{}^{/}\text{}^{+}$ level. Special annealing of the samples, which enlarges the free electron concentration, was used. The occupation of A$\text{}_{1}^{0}\text{}^{/}\text{}^{+}$ level, at ambient pressure, was observed by pressure dependent Hall effect measurements.
Źródło:
Acta Physica Polonica A; 1993, 84, 4; 807-811
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Composite zones produced in situ in the Ni3Al phase
Autorzy:
Olejnik, E.
Janas, A.
Sikora, G.
Tokarski, T.
Nowak, J.
Powiązania:
https://bibliotekanauki.pl/articles/379777.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
composite layer
Ni3Al
cast intermetallic
in situ
synthesis TiC carbides
warstwa kompozytowa
węglik TiC
Opis:
The study presents the results of research on the development of composite zones in castings based on the intermetallic phase of Ni3Al. Composite zones were obtained by placing packets with substrates for the reaction of titanium carbide in a foundry mould. To provide a variable carbides content in the composite zone, two compositions of the packets were prepared. The first packet contained only substrates for the reaction of TiC synthesis; the second one also contained a filler. The resulting composite zones in castings were examined for the filler effect on changes in the volume fraction, size and morphology of carbides in the zone. In addition, the effect of filler on the mechanical properties of the zone was verified, observing changes of Vickers hardness in this area. It was found that the presence of filler in the composition of the packet for synthesis reduced the content of carbides, as well as their size and morphology. Lower surface content of carbides reduced hardness of the zone, which enabled smooth control of the mechanical properties. At the same time, the use of the selected filler did not disturb the course of the TiC carbide synthesis.
Źródło:
Archives of Foundry Engineering; 2013, 13, 1; 107-112
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the Complex Event Processing system for anomaly detection and network monitoring
Autorzy:
Frankowski, G.
Jerzak, M.
Miłostan, M.
Nowak, T.
Pawłowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/305323.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
network monitoring
intrusion detection
anomaly detection
complex event processing
Opis:
Protection of infrastructures for e-science, including grid environments and NREN facilities, requires the use of novel techniques for anomaly detection and network monitoring. The aim is to raise situational awareness and provide early warning capabilities. The main operational problem that most network operators face is integrating and processing data from multiple sensors and systems placed at critical points of the infrastructure. From a scientific point of view, there is a need for the efficient analysis of large data volumes and automatic reasoning while minimizing detection errors. In this article, we describe two approaches to Complex Event Processing used for network monitoring and anomaly detection and introduce the ongoing SECOR project (Sensor Data Correlation Engine for Attack Detection and Support of Decision Process), supported by examples and test results. The aim is to develop methodology that allows for the construction of next-generation IDS systems with artificial intelligence, capable of performing signature-less intrusion detection.
Źródło:
Computer Science; 2015, 16 (4); 351-371
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic absorption of a new class of alumina foams with various high-porosity levels
Autorzy:
Zieliński, T. G.
Potoczek, M.
Śliwa, R. E.
Nowak, Ł. J.
Powiązania:
https://bibliotekanauki.pl/articles/177924.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sound absorption
porous materials
alumina foam
Opis:
Recently, a new class of ceramic foams with porosity levels up to 90% has been developed as a result of the association of the gelcasting process and aeration of the ceramic suspension. This paper presents and discusses original results advertising sound absorbing capabilities of such foams. The authors man- ufactured three types of alumina foams in order to investigate three porosity levels, namely: 72, 88, and 90%. The microstructure of foams was examined and typical dimensions and average sizes of cells (pores) and cell-linking windows were found for each porosity case. Then, the acoustic absorption coefficient was measured in a wide frequency range for several samples of various thickness cut out from the foams. The results were discussed and compared with the acoustic absorption of typical polyurethane foams proving that the alumina foams with high porosity of 88-90% have excellent sound absorbing properties competitive with the quality of sound absorbing PU foams of higher porosity.
Źródło:
Archives of Acoustics; 2013, 38, 4; 495-502
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alanine dosimetry of 60 MeV proton beam - preliminary results
Autorzy:
Michalec, B.
Mierzwińska, G.
Sowa, U.
Ptaszkiewicz, M.
Nowak, T.
Swakoń, J.
Powiązania:
https://bibliotekanauki.pl/articles/146730.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
alanine
dosimetry
electron paramagnetic resonance (EPR)
proton beam
Opis:
Electron paramagnetic resonance (EPR) spectrometry (X-band) was used to determine the dose absorbed in alanine detectors, of different shapes and different alanine content, irradiated with Co-60 gamma rays and in a 60 MeV proton beam. The goal of our study was to confirm applicability of alanine as a passive detector in therapeutic proton beam. In the paper dose response characteristic and relative efficiency of alanine are shown. The study confirmed that alanine detectors with a high alanine content (ca. 95%) may be a useful and convenient tool for dose measurements in proton beams, used for eye cancer treatment.
Źródło:
Nukleonika; 2012, 57, 4; 503-506
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dosimetric characteristics of active solid state detectors in a 60 MeV proton radiotherapy beam
Autorzy:
Sowa, U.
Nowak, T.
Michalec, B.
Mierzwińska, G.
Swakoń, J.
Olko, P.
Powiązania:
https://bibliotekanauki.pl/articles/146780.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
diamond dosimeter
diode Si
dosimetry
proton beam
Opis:
Several solid state detectors, such as dosimetric diodes, MOSFET detectors or diamond detectors are used for quality control of radiotherapy beams. The goal of this work was to determine dosimetric properties of the PTW diamond detector (DD) and the PTW silicon diode in the 60 MeV therapeutic beam (practical range in water Rp = 29.17 mm) located at the Institute of Nuclear Physics, Polish Academy of Sciences (IFJ PAN, Kraków). A PTW Markus ionization chamber was used as a reference device. The empirical correction factor for diamond detector, kDD(Rresidual), introduced in the Technical Report Series of IAEA, TRS-398 [9] as a function of beam quality, Rresidual, was found to decrease from 1.12 for Rresidual = 1.5 mm to 1.04 for Rresidual = 26 mm. The reproducibility of response of DD and PTW diodes in the proton filed did not exceed 0.11%. Our results show that diamond detectors and dosimetric diodes are useful tools for quality assurance (QA) of therapeutic proton beam, but each type of detectors has specific properties which should be taken into account when choosing particular application.
Źródło:
Nukleonika; 2012, 57, 4; 491-495
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
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