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Wyświetlanie 1-15 z 17
Tytuł:
Theoretical geodesy
Autorzy:
Borkowski, A.
Kosek, W.
Powiązania:
https://bibliotekanauki.pl/articles/145440.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
M-estimation
robust estimation
reliability
time series
polar motion
niezawodność
szeregi czasowe
estymacja
Opis:
The paper presents a summary of research activities concerning theoretical geodesy performed in Poland in the period of 2011-2014. It contains the results of research on new methods of the parameter estimation, a study on robustness properties of the M-estimation, control network and deformation analysis, and geodetic time series analysis. The main achievements in the geodetic parameter estimation involve a new model of the M-estimation with probabilistic models of geodetic observations, a new Shift-Msplit estimation, which allows to estimate a vector of parameter differences and the Shift-Msplit(+) that is a generalisation of Shift-Msplit estimation if the design matrix A of a functional model has not a full column rank. The new algorithms of the coordinates conversion between the Cartesian and geodetic coordinates, both on the rotational and triaxial ellipsoid can be mentioned as a highlights of the research of the last four years. New parameter estimation models developed have been adopted and successfully applied to the control network and deformation analysis. New algorithms based on the wavelet, Fourier and Hilbert transforms were applied to find time-frequency characteristics of geodetic and geophysical time series as well as time-frequency relations between them. Statistical properties of these time series are also presented using different statistical tests as well as 2nd, 3rd and 4th moments about the mean. The new forecasts methods are presented which enable prediction of the considered time series in different frequency bands.
Źródło:
Geodesy and Cartography; 2015, 64, 2; 261-279
2080-6736
2300-2581
Pojawia się w:
Geodesy and Cartography
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wavelet based buildings segmentation in airborne laser scanning data set
Segmentacja budynków w zbiorze danych lotniczego skaningu laserowego w oparciu o analizę falkową
Autorzy:
Keller, W.
Borkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/145442.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
segmentacja budynków
trójwymiarowe modelowanie budynków
lotniczy skaning laserowy
wavelet
airborne laser scanning (ALS)
segmentation
multiresolution analysis
Opis:
In the recent years three-dimensional buildings modelling based on an raw airborne laser scanning point clouds, became an important issue. A significant step towards 3D modelling is buildings segmentation in laser scanning data. For this purpose an algorithm, based on the multi-resolution analysis in wavelet domain, is proposed in the paper. The proposed method concentrates only on buildings, which have to be segmented. All other objects and terrain surface have to be removed. The algorithm works on gridded data. The wavelet-based segmentation proceeds in the following main steps: wavelet decomposition up to appropriately chosen level, thresholding on the chosen and adjacent levels, removal of all coefficients in the so-called influence pyramid and wavelet reconstruction. If buildings on several scaling spaces have to be segmented, the procedure should be applied iteratively. The wavelet approach makes the procedure very fast. However, the limitation of the proposed procedure is its scale-based distinction between objects to be segmented and the rest.
W ostatnich latach ważnym zagadnieniem staje się trójwymiarowe modelowania budynków w oparciu o dane lotniczego skaningu laserowego. Istotnym krokiem na drodze dochodzenia do trójwymiarowego modelu jest segmentacja budynków w zbiorze danych skaningowych. W tym celu zaproponowano w pracy algorytm bazujący na analizie wielorozdzielczej danych w dziedzinie falkowej. Proponowana metoda koncentruje się wyłącznie na budynkach, które podlegają segmentacji. Wszystkie inne obiekty oraz powierzchnia terenu są usuwane. Algorytm działa na danych opartych o regularna siatkę. Segmentacja oparta o analizę falkową przebiega w następujących krokach głównych: falkowa dekompozycja aż do odpowiednio wybranego poziomu (wybranej skali), progowanie na wybranym i sąsiednich poziomach, usuniecie wszystkich współczynników dekompozycji w obrębie tak zwanej piramidy wpływu i rekonstrukcja falkowa sygnału. Jeśli budynki podlegające segmentacji występują na kilku skalach opisana procedurę należy zastosować iteracyjnie. Algorytm opary o analizę falkową charakteryzuje się dużą szybkością. Jednakże ograniczeniem proponowanej metody jest rozróżnialność obiektów podlegających segmentacji od reszty na tym samym poziomie - tej samej skali.
Źródło:
Geodesy and Cartography; 2011, 60, 2; 99-121
2080-6736
2300-2581
Pojawia się w:
Geodesy and Cartography
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of electron donors and copper concentration on geochemical and mineralogical processes under conditions of biological sulphate reduction
Autorzy:
Wolicka, D.
Borkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/139371.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
anaerobic conditions
biogenic minerals
copper
geochemical processes
sulphate-reducing bacteria (SRB)
warunki beztlenowe
biogenne minerały
miedź
procesy geochemiczne
bakterie redukujące siarczany
Opis:
Sulphidogenous microorganism communities were isolated from soil polluted by crude oil. The study was focused on determining the influence of 1) copper (II) concentration on the activity of selected microorganism communities and 2) the applied electron donor on the course and evolution of mineral-forming processes under conditions favouring growth of sulphate-reducing bacteria (SRB). The influence of copper concentration on the activity of selected microorganism communities and the type of mineral phases formed was determined during experiments in which copper (II) chloride at concentrations of 0.1, 0.2, 0.5 and 0.7 g/L was added to SRB cultures. The experiments were performed in two variants: with ethanol (4 g/L) or lactate (4 g/L) as the sole carbon source. In order to determine the taxonomic composition of the selected microorganism communities, the 16S rRNA method was used. Results of this analysis confirmed the presence of Desulfovibrio, Desulfohalobium, Desulfotalea, Thermotoga, Solibacter, Gramella, Anaeromyxobacter and Myxococcus sp. in the stationary cultures. The post-culture sediments contained covelline (CuS) and digenite (Cu9S5). Based on the results, it can be stated that the type of carbon source applied during incubation plays a crucial role in determining the mineral composition of the post-culture sediments. Thus, regardless of the amount of copper ion introduced to a culture with lactate as the sole carbon source, no copper sulphide was observed in the post-culture sediments. Cultures with ethanol as the sole carbon source, on the other hand, yielded covelline or digenite in all post-culture sediments.
Źródło:
Acta Geologica Polonica; 2014, 64, 1; 129-137
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sulphate and arsenate minerals as environmental indicators in the weathering zones of selected ore deposits, Western Sudetes, Poland
Autorzy:
Parafiniuk, J.
Siuda, R.
Borkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/139438.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sulphates
arsenates
Slavikite
zýkaite
kaňkite
pitticite
fosforany
arseniany
zýkait
kaňkit
pitticit
Opis:
The results of a complex investigation of the sulphate and arsenate assemblages forming in the weathering zone of selected ore deposits in the Sudetes are presented. The development of the weathering zone has been characterised in the polymetallic ore deposits at Miedzianka–Ciechanowice and Radzimowice, and the pyrite deposit at Wieściszowice, which differ in the chemical compositions of the ore and barren minerals and the hydrological conditions. Secondary sulphate and arsenate mineral assemblages vary significantly among the ore deposits under study. Their crystallization is discussed, taking into consideration the stability of particular minerals and the paths of their transformation. It is shown that these minerals have great potential as indicators of weathering processes. A significant role for microorganisms in the formation of the weathering zone of the ore deposits under study is also proven.
Źródło:
Acta Geologica Polonica; 2016, 66, 3; 493-508
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Minimization of maximum errors in universal approximation of the unit circle by a polygon
Autorzy:
Borkowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/221779.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
unit circle
approximation by polygon
LIDFT
interpolated DFT
zero padding
Opis:
This paper presents a universal approximation of the unit circle by a polygon that can be used in signal processing algorithms. Optimal choice of the values of three parameters of this approximation allows one to obtain a high accuracy of approximation. The approximation described in the paper has a universal character and can be used in many signal processing algorithms, such as DFT, that use the mathematical form of the unit circle. One of the applications of the described approximation is the DFT linear interpolation method (LIDFT). Applying the results of the presented paper to improve the LIDFT method allows one to significantly decrease the errors in estimating the amplitudes and frequencies of multifrequency signal components. The paper presents the derived formulas, an analysis of the approximation accuracy and the region of best values for the approximation parameters.
Źródło:
Metrology and Measurement Systems; 2011, 18, 3; 391-402
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of A/D quantization in an interpolated DFT based system of power control with a small delay
Autorzy:
Borkowski, J.
Kania, D.
Mroczka, J.
Powiązania:
https://bibliotekanauki.pl/articles/221386.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
photovoltaic system
frequency estimation
signal processing
A/D converter
control of power system
Opis:
Fast and accurate grid signal frequency estimation is a very important issue in the control of renewable energy systems. Important factors that influence the estimation accuracy include the A/D converter parameters in the inverter control system. This paper presents the influence of the number of A/D converter bits b, the phase shift of the grid signal relative to the time window, the width of the time window relative to the grid signal period (expressed as a cycle in range (CiR) parameter) and the number of N samples obtained in this window with the A/D converter on the developed estimation method results. An increase in the number b by 8 decreases the estimation error by approximately 256 times. The largest estimation error occurs when the signal module maximum is in the time window center (for small values of CiR) or when the signal value is zero in the time window center (for large values of CiR). In practical applications, the dominant component of the frequency estimation error is the error caused by the quantization noise, and its range is from approximately 8×10-10 to 6×10-4.
Źródło:
Metrology and Measurement Systems; 2014, 21, 3; 423-432
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transport a organizacja przestrzeni w życiu społeczno-gospodarczym
Autorzy:
Borkowski, Przemysław
Burnewicz, Jan
Koźlak, Aleksandra
Pawłowska, Barbara
Ważna, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/2025147.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
spatial chaos and transport
transport planning
transport in urban planning
Źródło:
Studia komitetu przestrzennego zagospodarowania kraju PAN; 2018, 182, 2; 81-113
0079-3507
Pojawia się w:
Studia komitetu przestrzennego zagospodarowania kraju PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of Salmonella enteritidis recombinant heat shock protein 60 production
Autorzy:
Rainczak, K.
Bajzert, J.
Galli, J.
Selera, A.
Wieliczko, A.
Borkowski, J.
Stefaniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/31046.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
HSP60 protein
Salmonella enteritidis
heat shock protein
host
Escherichia coli
Opis:
The aim of the study was to optimize conditions for producing Salmonella Enteritidis recombinant heat shock protein 60 (rHsp60). Seven Escherichia coli host strains (Rosetta, Turner, C41, C43, Origami, BL21pLys, Rosetta pLys) were transformed by a recombinant plasmid containing Hsp60 gene from Salmonella Enteritidis, and then cultured and induced by isopropyl-β-D-thiogalactopyranoside (IPTG). The highest S. Enteritidis rHsp60 yield was obtained using E. coli strain C41. Induction of this strain using IPTG allowed the yield 400 μg of S. Enteritidis Hsp60 protein/2L of culture, but by autoinduction the yield exceeded 800 μg/2L.
Źródło:
Polish Journal of Veterinary Sciences; 2011, 14, 1
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical and Electrical Properties of Silver-Matrix Composites Reinforced with Various Forms of Refractory Phases
Autorzy:
Borkowski, P.
Pietrzak, K.
Frydman, K.
Wójcik-Grzybek, D.
Gładki, A.
Sienicki, A.
Powiązania:
https://bibliotekanauki.pl/articles/351236.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
composite materials
electrical contacts
arc erosion
contact resistance
Opis:
This paper presents technological trials aimed at producing Ag-W, Ag-WC, Ag-W-C and Ag-WC-C composite contact materials and characterizing their properties. These materials were obtained using two methods, i.e. press-sinter-repress (PSR) at the refractory phase content of less than 30% by weight as well as press-sinter-infiltration (PSI) at the refractory phase content of ≥50% by weight). The results of research into both the physical and electrical properties of the outcome composites were shown. They include the analysis of the influence of the refractory phase content (W or WC) on arc erosion and contact resistance changes for the following current range: 6 kAmax in the case of composites with a low refractory phase content, 10 kAmax in the case of composites with the refractory phase content of ≥50% by weight.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 817-823
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Single-ended quality measurement of a music content via convolutional recurrent neural networks
Autorzy:
Organiściak, Kamila
Borkowski, Józef
Powiązania:
https://bibliotekanauki.pl/articles/1849158.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
audio data analysis
artefacts detection
convolutional neural networks
recurrent neural networks
classification model
Opis:
The paper examines the usage of Convolutional Bidirectional Recurrent Neural Network (CBRNN) for a problem of quality measurement in a music content. The key contribution in this approach, compared to the existing research, is that the examined model is evaluated in terms of detecting acoustic anomalies without the requirement to provide a reference (clean) signal. Since real music content may include some modes of instrumental sounds, speech and singing voice or different audio effects, it is more complex to analyze than clean speech or artificial signals, especially without a comparison to the known reference content. The presented results might be treated as a proof of concept, since some specific types of artefacts are covered in this paper (examples of quantization defect, missing sound, distortion of gain characteristics, extra noise sound). However, the described model can be easily expanded to detect other impairments or used as a pre-trained model for other transfer learning processes. To examine the model efficiency several experiments have been performed and reported in the paper. The raw audio samples were transformed into Mel-scaled spectrograms and transferred as input to the model, first independently, then along with additional features (Zero Crossing Rate, Spectral Contrast). According to the obtained results, there is a significant increase in overall accuracy (by 10.1%), if Spectral Contrast information is provided together with Mel-scaled spectrograms. The paper examines also the influence of recursive layers on effectiveness of the artefact classification task.
Źródło:
Metrology and Measurement Systems; 2020, 27, 4; 721-733
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Systematic errors of the LIDFT method: analytical form and verification by a Monte Carlo method
Autorzy:
Borkowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/221176.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
LIDFT
multifrequency signal
interpolated DFT
spectrum estimation
zero padding
unit circle
approximation by polygon
Opis:
This paper derives analytical formulas for the systematic errors of the linear interpolated DFT (LIDFT) method when used to estimating multifrequency signal parameters and verifies this analysis using Monte-Carlo simulations. The analysis is performed on the version of the LIDFT method based on optimal approximation of the unit circle by a polygon using a pair of windows. The analytical formulas derived here take the systematic errors in the estimation of amplitude and frequency of component oscillations in the multifrequency signal as the sum of basic errors and the errors caused by each of the component oscillations. Additional formulas are also included to analyze particular quantities such as a signal consisting of two complex oscillations, and the analyses are verified using Monte-Carlo simulations.
Źródło:
Metrology and Measurement Systems; 2012, 19, 4; 673-684
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanocrystalline Ag-Re Composite as a Potential Material for Electric Contacts Fabrication
Autorzy:
Kołacz, D.
Księżarek, S.
Woch, M.
Karwan-Baczewska, J.
Staszewski, M.
Rudnicki, K.
Borkowski, P.
Sienicki, A.
Powiązania:
https://bibliotekanauki.pl/articles/354356.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electric contact
composite
nanocrystalline
contact materials
arc erosion
examination methods
electric properties
Opis:
A new silver-based composite material with an addition of 1 and 10 mass % of rhenium, for prospective application in the production of electric contacts, has been presented. The paper shows results of the research and experimental works aimed at developing technology for fabrication of semiproducts (wires and bimetallic contacts) by classical powder metallurgy methods and by a method enabling production of nanocrystalline composite. At each stage of the processes involved, physical, mechanical and technological properties of the materials were investigated. Particular attention was given to final products and semiproducts prepared in a form of bimetallic contacts. It was found that the composite with nanocrystalline structure may be a good material for ecological electric contacts.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 1847-1852
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A mathematical model for calculating contact mass loss resulting from bridge disintegration in vacuum
Autorzy:
Borkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/140398.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
łuk elektryczny
ubytek masy styków
styk elektryczny
oprogramowanie
łącznik elektryczny
electrical arc
contact mass loss
contact bridge
software
Opis:
The paper presents descriptions of bridge disintegration types and contact mass loss in the bridge stage. There is presented Matlab solvers to solve equation describing dynamic changes of temperature in the bridge region. The final result of program calculations is the mass loss and the volume of the metal of contacts which was lost during the bridge stage.
Źródło:
Archives of Electrical Engineering; 2011, 60, 4; 399-411
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of sine-wave frequency estimation methods in respect of speed and accuracy for a few observed cycles distorted by noise and harmonics
Autorzy:
Borkowski, J.
Kania, D.
Mroczka, J.
Powiązania:
https://bibliotekanauki.pl/articles/220583.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
DFT spectrum interpolation
short-time frequency estimation
statistical analysis
Prony LS
TLS
ESPRIT
Opis:
The paper deals with frequency estimation methods of sine-wave signals for a few signal cycles and consists of two parts. The first part contains a short overview where analytical error formulae for a signal distorted by noise and harmonics are presented. These formulae are compared with other accurate equations presented previously by the authors which are even more accurate below one cycle in the measurement window. The second part contains a comparison of eight estimation methods (ESPRIT, TLS, Prony LS, a newly developed IpDFT method and four other 3-point IpDFT methods) in respect of calculation time and accuracy for an ideal sine-wave signal, signal distorted by AWGN noise and a signal distorted by harmonics. The number of signal cycles is limited from 0.1 to 3 or 5. The results enable to select the most accurate/fastest estimation method in various measurement conditions. Parametric methods are more accurate but also much slower than IpDFT methods (up to 3000 times for the number of samples equal to 5000). The presented method is more accurate than other IpDFT methods and much faster than parametric methods, which makes it possible to use it as an alternative, especially in real-time applications.
Źródło:
Metrology and Measurement Systems; 2018, 25, 2; 283-302
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Contacts Erosion Modelling Using Ansys Computer Software And Experimental Research
Modelowanie erozji styków z wykorzystaniem profesjonalnego programu komputerowego ANSYS wraz z weryfikacją eksperymentalną
Autorzy:
Borkowski, P.
Sienicki, A.
Powiązania:
https://bibliotekanauki.pl/articles/356816.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
contacts
electrical arc
mass transfer
contact erosion modelling
ANSYS software
styki
łuk elektryczny
przenikanie masy
modelowanie erozji styków
oprogramowanie ANSYS
Opis:
The paper presents a method of contacts’ erosion modelling by using computer simulation and analyzing heating, melting and evaporation processes, which cause contact erosion due to application of electric arc. Calculations have been conducted using professional ANSYS software which allows for thermal processes simulation and includes phase transitions for Ag, Cu, W metals and Ag-W50 composite.
Artykuł przedstawia metody modelowania erozji stykowej z wykorzystaniem symulacji komputerowej i analizy procesów nagrzewania, topnienia i parowania, które powodują erozję styków pod wpływem oddziaływania łuku elektrycznego. Obliczenia zostały przeprowadzone za pomocą profesjonalnego programu komputerowego ANSYS, który pozwala na symulację procesów termicznych z uwzględnieniem przemian fazowych dla styków wykonanych z metali: Ag, Cu, W, a także kompozytów Ag-W50.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2A; 551-560
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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