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Wyświetlanie 1-15 z 620
Tytuł:
Discussions and Comments on the Paper: E. S. Dzidowski, 2013, "The Effect of Secondary Metalworking Processes on Susceptibility of Aircraft to Catastrophic Failures and Prevention Methods", Archives of Metallurgy and Materials, 58 (4), pp. 1207-1212)
Autorzy:
Wanhill, R. J. H.
Powiązania:
https://bibliotekanauki.pl/articles/352896.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aircraft
materials
cracking
prevention
workability optimization
Opis:
The paper ‘The effect of secondary metalworking processes on susceptibility of aircraft to catastrophic failures and prevention methods’ [1] emphasizes that fatigue is the main failure mode for metallic aircraft structures. This is corroborated by Figure 1 [2,3] and other sources [4-6]. (...) The discussions and comments in the following sections of the present document are directed to the foregoing statements and their validities.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 773-779
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Frequency Dependent Mismatch Correction Scheme for Zero-IF Receivers
Autorzy:
Hibner, R.
Zieliński, R. J.
Powiązania:
https://bibliotekanauki.pl/articles/226210.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
zero-IF
ZIF
compensation
quadrature
IQ
wideband
dynamic range
image correction
Opis:
This paper shows effective method of linear distortions compensation in zero-IF receivers. With application of frequency domain processing a computation efficient method was developed that allows to correct quadrature mismatch in Zero-IF receiver along with gain and group delay independent of receiving signal type. Method was implemented and tested on hardware platform confirming its effectiveness. This method makes it possible to build high sensitivity devices to monitor spectrum in very wide frequency ranges.
Źródło:
International Journal of Electronics and Telecommunications; 2018, 64, 1; 13-18
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Filtering Enhanced Traffic Management System (ETMS) altitude data
Autorzy:
Palacios, R.
Hansman, R. J.
Powiązania:
https://bibliotekanauki.pl/articles/221612.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
air transportation
traffic management
signal processing
filters
Opis:
Enhanced Traffic Management System (ETMS) stores all the information gathered by the Federal Aviation Administration (FAA) from aircraft flying in the US airspace. The data stored from each flight includes the 4D trajectory (latitude, longitude, altitude and timestamp), radar data and flight plan information. Unfortunately, there is a data quality problem in the vertical channel and the altitude component of the trajectories contains some isolated samples in which a wrong value was stored. Overall, the data is generally accurate and it was found that only 0.3% of the altitude values were incorrect, however the impact of these erroneous data in some analyses could be important, motivating the development of a filtering procedure. The approach developed for filtering ETMS altitude data includes some specific algorithms for problems found in this particular dataset, and a novel filter to correct isolated bad samples (named Despeckle filter). As a result, all altitude errors were eliminated in 99.7% of the flights affected by noise, while preserving the original values of the samples without bad data. The algorithm presented in this paper attains better results than standard filters such as the median filter, and it could be applied to any signal affected by noise in the form of spikes.
Źródło:
Metrology and Measurement Systems; 2013, 20, 3; 453-464
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Periods of occurrence and fecundity of Arion lusitanicus Mab. [Gastropoda: Pulmonata] in crop plant habitats in Poland
Autorzy:
Kozlowski, J
Kozlowski, R.J.
Powiązania:
https://bibliotekanauki.pl/articles/65635.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
crop plant habitat
Gastropoda
Polska
Arion lusitanicus
occurrence period
plant protection
fecundity
life cycle
slug
Pulmonata
Opis:
In the years 1997-1999, studies on the periods of A. lusitanicus development and on the occurrence of its developmental stages were carried out. Dates of overwintering, mating, egg-laying, hatching and population peaks of the slug were observed on six sites located in horticultural habitats, as well as in the isolation cage, where slugs were reared. It was ascertained that A. lusitanicus has a year-long life cycle. The slug overwinters in the form of eggs or juvenile stages and rarely as adult individuals. Young slugs leave their winter shelters by the end of February. The mating period starts in the second half of July and lasts from 6 to 10 weeks. Eggs are laid from mid-August till late autumn. Slug hatching occurs in spring and autumn at the time of plant sprouting.
W latach 1997-1999 w rejonie Łańcuta prowadzono badania nad cyklem życiowym ślinika luzytańskiego - Arion lusitanicus Mah. W siedliskach upraw ogrodniczych oraz w izolatorze z hodowlą ślimaka obserwowano terminy: zimowania, kopulacji, składania jaj, wylęgania ślimaków i szczytów liczebności. Ustalono, że A. lusitanicus ma roczny cykl życiowy, ale w populacji ślimaka mogą także występować pojedyncze osobniki o dwuletnim cyklu życiowym. Zimują jaja lub stadia młodociane, rzadziej osobniki dorosłe. Młode ślimaki opuszczają kryjówki zimowe pod koniec lutego. Wyląg ślimaków z jaj zimujących trwa od połowy marca do końca kwietnia. W połowie maja stadia młodociane osiągają szczyt liczebności. Okres kopulacji rozpoczyna się w drugiej połowie lipca i trwa od 1,5 do 2,5 miesiąca. Jaja składane są od połowy sierpnia do późnej jesieni. Ze złożonych jaj wyląg ślimaków rozpoczyna na początku drugiej dekady września i trwa od 50 do 80 dni. Przed zimą wylęga się do 30% jaj. Reszta jaj zimuje i wylęga się wiosną następnego roku. Liczne pojawy A. lusitanicus przypadają wiosną i wczesną jesienią, w okresach wzrostu i wschodów roślin uprawnych najbardziej wrażliwych na żerowanie ślimaka.
Źródło:
Journal of Plant Protection Research; 2000, 40, 3-4
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of Special Shielding Materials at S and C Band Using Improved Free-Space Transmission Technique
Autorzy:
Dvurechenskaya, N.
Zieliński, R. J.
Powiązania:
https://bibliotekanauki.pl/articles/226270.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nonwoven
fabric
shielding effectiveness
freespace measurements
surface resistivity
Opis:
In this paper we discuss state of the art in the field of shielding materials investigation. Two types of newly manufactured shielding materials (nonwoven and fabric) were measured using improved free-space transmission technique at 2-5 GHz depending on electromagnetic wave (EM) polarization and antenna to specimen distance. Results of shielding effectiveness (SE) evaluation based on measured complex transmission coefficients (S21) were presented and compared with SE measured using coaxial transmission line technique. Also results of surface resistance measurements with the four-probe technique for the test materials are shown.
Źródło:
International Journal of Electronics and Telecommunications; 2011, 57, 3; 329-334
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Altitude Platform : Future of Infrastructure
Autorzy:
Malinowski, A.
Zieliński, R. J.
Powiązania:
https://bibliotekanauki.pl/articles/226948.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
HAP
High Altitude Platform
rural area
infrastructure
Opis:
High Altitude Platform (HAP) concept and idea is presented in the article. Characteristics, advantages and disadvantages of HAPs are described. There is also the comparison available between HAPs and existing telecommunication infrastructure (terrestrial and satellite). Selected examples of the possible limitation and technological restrictions of HAP based systems are presented in the article.
Źródło:
International Journal of Electronics and Telecommunications; 2010, 56, 2; 191-196
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigating the effect of the number of end-panel studs on the seismic properties of cold-formed light-steel shear-panel braces
Autorzy:
Tafti, M. R. J.
Behnamfar, F.
Powiązania:
https://bibliotekanauki.pl/articles/230627.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stal formowana na zimno
rama stalowa lekka
usztywnienie na ścinanie
wytrzymałość boczna
współczynnik modyfikacji odpowiedzi
cold-formed steel
light steel frame
shear-panel bracing
lateral performance
response modification factor
Opis:
Detailed investigation of the effect of the number of end-panel studs on the seismic properties of light-steel shear-panel braces in cold-formed steel frames and in particular the associated response modification coefficients (R) factor, are presented in this paper. A total of 6 full-scale 1200×2400 mm specimens are considered, and the responses investigated under a standard cyclic loading regime. Of particular interest are the specimens’ maximum lateral load capacity and deformation behavior as well as a rational estimation of the seismic response modification factor. The study also looks at the failure modes of the system and investigates the main factors contributing to the ductile response of the tested shear-panel braces in order to suggest improvements so that braces respond plastically with a significant drift and without any risk of brittle failure, such as connection failure or stud buckling.
Źródło:
Archives of Civil Engineering; 2013, 59, 2; 197-214
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trunked Radio Solutions for Special Applications
Autorzy:
Gajewski, S.
Gajewska, M.
Katulski, R. J.
Powiązania:
https://bibliotekanauki.pl/articles/226766.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
LTE
trunked radio
TETRA
DMR
Opis:
In the paper modern concepts of radio communication trunking-dispatch systems for special applications are presented. Basic standards of TETRA, DMR, and cdma2000 are mentioned. The aim of the paper is to present innovative trunking solutions based on the LTE system working both in FDD and TDD mode. The architecture of LTE trunked radio is shown as well as new services possible to implementation are described. The way of TETRA and LTE integration is characterized.
Źródło:
International Journal of Electronics and Telecommunications; 2014, 60, 4; 309-314
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Joint time-frequency and wavelet analysis - an introduction
Autorzy:
Majkowski, A.
Kołodziej, M.
Rak, R. J.
Powiązania:
https://bibliotekanauki.pl/articles/220841.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
frequency analysis
time-frequency analysis
short-time Fourier transform
Gabor transform
Wigner-Ville transform
Cone-Shaped Transform
wavelet analysis
time-scale analysis
wavelet decomposition
filter banks
wavelet packets
Opis:
A traditional frequency analysis is not appropriate for observation of properties of non-stationary signals. This stems from the fact that the time resolution is not defined in the Fourier spectrum. Thus, there is a need for methods implementing joint time-frequency analysis (t/f) algorithms. Practical aspects of some representative methods of time-frequency analysis, including Short Time Fourier Transform, Gabor Transform, Wigner-Ville Transform and Cone-Shaped Transform are described in this paper. Unfortunately, there is no correlation between the width of the time-frequency window and its frequency content in the t/f analysis. This property is not valid in the case of a wavelet transform. A wavelet is a wave-like oscillation, which forms its own “wavelet window”. Compression of the wavelet narrows the window, and vice versa. Individual wavelet functions are well localized in time and simultaneously in scale (the equivalent of frequency). The wavelet analysis owes its effectiveness to the pyramid algorithm described by Mallat, which enables fast decomposition of a signal into wavelet components.
Źródło:
Metrology and Measurement Systems; 2014, 21, 4; 741-758
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Brain-computer interface as measurement and control system The review paper
Autorzy:
Rak, R. J.
Kołodziej, M.
Majkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/221747.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
EEG
brain-computer interface
feature extraction
feature selection
measurement and control
Opis:
In the last decade of the XX-th century, several academic centers have launched intensive research programs on the brain-computer interface (BCI). The current state of research allows to use certain properties of electromagnetic waves (brain activity) produced by brain neurons, measured using electroencephalographic techniques (EEG recording involves reading from electrodes attached to the scalp - the non-invasive method - or with electrodes implanted directly into the cerebral cortex - the invasive method). A BCI system reads the user's "intentions" by decoding certain features of the EEG signal. Those features are then classified and "translated" (on-line) into commands used to control a computer, prosthesis, wheelchair or other device. In this article, the authors try to show that the BCI is a typical example of a measurement and control unit.
Źródło:
Metrology and Measurement Systems; 2012, 19, 3; 427-444
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Automatic Synthesis of Musical Phrases from Multi-Pitch Samples
Autorzy:
Pluta, M.
Spalek, L. J.
Delekta, R. J.
Powiązania:
https://bibliotekanauki.pl/articles/177577.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sound synthesis
synthesis methods
sampling
Concatenative Sound Synthesis
Opis:
Sound synthesizers are a natural element of a musician’s toolset. In music arrangement, samplers can often produce satisfactory results, but it requires a combination of manual and automatic methods that may be arduous at times. Concatenative Sound Synthesis reproduces many of natural performance- and expression-related nuances but at a cost of high demand for processing power. Here, another method of musical phrase synthesis aimed at music arrangement is presented that addresses these and other related issues. Contrary to common practice, we propose to record and utilize sound samples containing not one, but short sequences of pitches. In effect, natural pitch transitions are preserved and phrases appear to be much smoother, despite using very limited set of performance rules. The proof-of-concept implementation of the proposed method is discussed in detail along with attempts at optimizing the final sound effects, based on auditory tests. The limitations and future applications of the synthesizer are also discussed.
Źródło:
Archives of Acoustics; 2017, 42, 2; 235-247
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Libyan Period in Egypt. Historical and Cultural Studies into the 21st–24th Dynasties: Proceedings of a Conference at Leiden University, 25–27 October 2007
Autorzy:
Lipiński, Edward
Broekman, G.P.F.
Demarée, R.J.
Powiązania:
https://bibliotekanauki.pl/articles/707567.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
Rocznik Orientalistyczny; 2011, 2
0080-3545
Pojawia się w:
Rocznik Orientalistyczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Simulation Model of the Radio Frequency MIMO-OFDM System
Autorzy:
Kowal, M.
Kubal, S.
Piotrowski, P.
Zieliński, R. J.
Powiązania:
https://bibliotekanauki.pl/articles/226276.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
MIMO-OFDM
Simulink
simulator
Opis:
The paper presents a simulation model of the radio frequency MIMO-OFDM system. The simulation model was made in Matlab Simulink environment. It contains the transmitter, the receiver and the telecommunication channel models. The telecommunication channel model consists of models used during development of technical documentation of IEEE 802.11n. Signals generated at the transmitter output are fully compatible with signals described in IEEE 802.11n [1]. Simulations are conducted on a radio frequency, so they can be compared with results of measurements of real systems.
Źródło:
International Journal of Electronics and Telecommunications; 2011, 57, 3; 323-328
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Operational characteristic of wireless WiMax and IEEE 802.11x systems in underground mine environments
Autorzy:
Kowal, M.
Kubal, S.
Piotrowski, P.
Zieliński, R. J.
Powiązania:
https://bibliotekanauki.pl/articles/227021.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
WLAN
WiMAX
throughput
delay
mine environment
Opis:
The paper presents research results pertaining to transmission parameters of wireless communication systems, based on WiMax and IEEE 802.11x radio interfaces. Research was performed in severe operating conditions of an underground mine - testing various parameters, such as: throughput, delays and maximum range.
Źródło:
International Journal of Electronics and Telecommunications; 2010, 56, 1; 81-86
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrodermal activity measurements for detection of emotional arousal
Autorzy:
Kołodziej, M.
Tarnowski, P.
Majkowski, A.
Rak, R. J.
Powiązania:
https://bibliotekanauki.pl/articles/200323.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electrodermal activity
EDA
galvanic skin response
GSR
skin conductance response
SCR
feature selection
arousal
valence
classification
regression
Opis:
In this article, we present a comprehensive measurement system to determine the level of user emotional arousal by the analysis of electrodermal activity (EDA). A number of EDA measurements were collected, while emotions were elicited using specially selected movie sequences. Data collected from 16 participants of the experiment, in conjunction with those from personal questionnaires, were used to determine a large number of 20 features of the EDA, to assess the emotional state of a user. Feature selection was performed using signal processing and analysis methods, while considering user declarations. The suitability of the designed system for detecting the level of emotional arousal was fully confirmed, throughout the number of experiments. The average classification accuracy for two classes of the least and the most stimulating movies varies within the range of 61‒72%.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 4; 813-826
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 620

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