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Wyświetlanie 1-15 z 18
Tytuł:
A method for Soft Fault Diagnosis of Linear Analog Circuits Using the Laplace Transform Technique
Autorzy:
Tadeusiewicz, Michał
Ossowski, Marek
Korzybski, Marek
Powiązania:
https://bibliotekanauki.pl/articles/1844533.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
analog linear circuits
fault diagnosis
multiple soft fault
Laplace transform
Opis:
This paper is focused on multiple soft fault diagnosis of linear time-invariant analog circuits and brings a method that achieves all objectives of the fault diagnosis: detection, location, and identification. The method is based on a diagnostic test arranged in the transient state, which requires one node accessible for excitation and two nodes accessible for measurement. The circuit is specified by two transmittances which express the Laplace transform of the output voltages in terms of the Laplace transform of the input voltage. Each of these relationships is used to create an overdetermined system of nonlinear algebraic equations with the circuit parameters as the unknown variables. An iterative method is developed to solve these equations. Some virtual solutions can be eliminated comparing the results obtained using both transmittances. Three examples are provided where laboratory or numerical experiments reveal effectiveness of the proposed method.
Źródło:
International Journal of Electronics and Telecommunications; 2021, 67, 3; 531-536
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bezład przestrzenny a zasoby informacji o stanie planowania przestrzennego w Polsce
Autorzy:
Pieniążek, Marek
Orleański, Michał
Powiązania:
https://bibliotekanauki.pl/articles/2025061.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
monitoring
regional statistics
spatial disorder
spatial planning
Źródło:
Studia komitetu przestrzennego zagospodarowania kraju PAN; 2018, 182, 2; 425-430
0079-3507
Pojawia się w:
Studia komitetu przestrzennego zagospodarowania kraju PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cephalopods in the food of Weddell seals from the Admiralty Bay (King George Island, South Shetland Islands)
Autorzy:
Lipiński, Marek
Woyciechowski, Michał
Powiązania:
https://bibliotekanauki.pl/articles/2058043.pdf
Data publikacji:
1981
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
Polish Polar Research; 1981, 2, 3-4; 163-167
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Itineraria i gawędy podróżnicze w lwowskim „Wieku Młodym” (1893–1904)
Itineraries and travel tales in the Lwów weekly Wiek Młody (1893–1904)
Autorzy:
Rogoż, Michał
Kolasa, Władysław Marek
Powiązania:
https://bibliotekanauki.pl/articles/421406.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Polish press in the late 19th century and early 20th century
children’s and juvenile magazines
geography and travel
itineraries
Wiek Młody
„Wiek Młody”
geografia
podróże
itineraria
czasopisma dla dzieci i młodzieży
XIX–XX wiek
Opis:
This article examines the geography and travel segment of the weekly Wiek Młody [Young Age], published in Lwów in 1893–1904. The material covered includes the itinerary, a specific subgenre that could often be found in magazines for children and teenagers at the turn of the 19th century. Apart from a series of quantitative and qualitative analyses of 54 texts, i.e. over 284 pages, this study also surveys the magazine’s themes and narrative formats.
Przedmiot rozważań stanowi tematyka geograficzno-podróżnicza, w tym itineraria, specyficzny rodzaj wypowiedzi obecny na łamach czasopism dla dzieci i młodzieży na przełomie XIX i XX wieku. Badania wykonano na przykładzie lwowskiego tygodnika „Wiek Młody”, wydawanego w latach 1893–1904. Uwzględniono aspekty ilościowe i jakościowe, w tym także tematykę i formy wypowiedzi. Łącznie szczegółowej analizie poddano 54 teksty o objętości przeszło 284 stron.
Źródło:
Rocznik Historii Prasy Polskiej; 2017, 20, 2; 61-72
1509-1074
Pojawia się w:
Rocznik Historii Prasy Polskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fixed-latency System for High-speed Serial Transmission Between FPGA Devices with Forward Error Correction
Autorzy:
Kruszewski, Michał
Zabołotny, Wojciech Marek
Powiązania:
https://bibliotekanauki.pl/articles/226360.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
data transmission
fixed-latency transmission
forward error correction
orthogonal concatenated coding
FPGA
Opis:
This paper presents the design of a compact protocol for fixed-latency, high-speed, reliable, serial transmission between simple field-programmable gate arrays (FPGA) devices. Implementation of the project aims to delineate word boundaries, provide randomness to the electromagnetic interference (EMI) generated by the electrical transitions, allow for clock recovery and maintain direct current (DC) balance. An orthogonal concatenated coding scheme is used for correcting transmission errors using modified Bose–Chaudhuri–Hocquenghem (BCH) code capable of correcting all single bit errors and most of the double-adjacent errors. As a result all burst errors of a length up to 31 bits, and some of the longer group errors, are corrected within 256 bits long packet. The efficiency of the proposed solution equals 46.48%, as 119 out of 256 bits are fully available to the user. The design has been implemented and tested on Xilinx Kintex UltraScale+ KCU116 Evaluation Kit with a data rate of 28.2 Gbps. Sample latency analysis has also been performed so that user could easily carry out calculations for different transmission speed. The main advancement of the work is the use of modified BCH(15, 11) code that leads to high error correction capabilities for burst errors and user friendly packet length.
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 3; 545-553
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neural network approach to compressor modelling with surge margin consideration
Autorzy:
Loryś, Sergiusz Michał
Orkisz, Marek
Powiązania:
https://bibliotekanauki.pl/articles/2091364.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
modelling
compressor map
neural-network
Opis:
Artificial neural networks are gaining popularity thank to their fast and accurate response paired with low computing power requirements. They have been proven as a method for compressor performance prediction with satisfactory results. In this paper a new approach of artificial neural networks modelling is evaluated. The auxiliary parameter of ‘relative stability margin Z’ was introduced and used in learning process. This approach connects two methods of compressor modelling such as neural networks and auxiliary parameter utilization. Two models were created, one with utilization of the ‘relative stability margin Z’ as a direct indication of surge margin of any estimated condition, and other with standard compressor parameters. The results were compared by determination of fitting, interpolation and extrapolation capabilities of both approaches. The artificial neural networks used during the process was a two-layer feed-forward neural-network with Levenberg–Marquardt algorithm with Bayesian regularization. The experimental data was interpolated to increase the amount of learning data for the neural network. With the two models created, capabilities of this relatively simple type of neural-network to approximate compressor map was also assessed.
Źródło:
Archives of Thermodynamics; 2022, 43, 1; 89--108
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Submarine evidence of the Aavatsmark and Dahl Glaciers fluctuations in the Kaffiøyra region, NW Spitsbergen
Autorzy:
Grześ, Marek
Król, Michał
Sobota, Ireneusz
Powiązania:
https://bibliotekanauki.pl/articles/2051659.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Svalbard
glacier
push-moraines
Źródło:
Polish Polar Research; 2009, 30, 2; 143-160
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamic analysis of modular high-temperature nuclear reactor coupled with the steam cycle for power generation
Autorzy:
Dudek, Michał
Jaszczur, Marek
Kolenda, Zygmunt
Powiązania:
https://bibliotekanauki.pl/articles/240411.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
modular high-temperature nuclear reactor HTR
rankine cycle
steam turbine
Opis:
Consumption of energy is one of the important indicators in developing countries, but a lot of companies from the energy sector have to cope with three key challenges, namely how to reduce their impact on the environment, how to ensure the low cost of the energy production and how to improve the system overall performance? For Polish energy market, the number of challenges is greater. The growing demand for electricity and contemporary development of nuclear power technology allow today’s design, implement new solutions for high energy conversion system low unit cost for energy and fuel production. In the present paper, numerical analysis of modular high-temperature nuclear reactor coupled with the steam cycle for electricity production has been presented. The analysed system consists of three independent cycles. The first two are high-temperature nuclear reactor cycles which are equipped with two high-temperature nuclear reactors, heat exchangers, blowers, steam generators. The third cycle is a Rankine cycle which is equipped with up to four steam turbines, that operate in the heat recovery system. The analysis of such a system shows that is possible to achieve significantly greater efficiency than offered by traditional nuclear reactor technology.
Źródło:
Archives of Thermodynamics; 2019, 40, 4; 49-66
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Performance Analysis of IEEE 802.11ax Networks
Autorzy:
Natkaniec, Marek
Prasnal, Łukasz
Szymakowski, Michał
Powiązania:
https://bibliotekanauki.pl/articles/227270.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
802.11ax
dense networks
performance analysis
Opis:
The paper is focused on the forthcoming IEEE 802.11ax standard and its influence on Wi-Fi networks performance. The most important features dedicated to improve transmission effectiveness are presented. Furthermore, the simulation results of a new transmission modes are described. The comparison with the legacy IEEE 802.11n/ac standards shows that even partial implementation of a new standard should bring significant throughput improvements.
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 1; 225-230
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fortification of damaged asphalt pavements with cement concrete slabs reinforced with next-gen bars – part I: Laboratory study
Autorzy:
Radziszewski, Piotr
Jackiewicz-Rek, Wioletta
Sarnowski, Michał
Urbański, Marek
Powiązania:
https://bibliotekanauki.pl/articles/231165.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wzmacnianie
pręt HFRP
wzmocnienie ciągłe
płyta betonowa
beton cementowy
nawierzchnia uszkodzona
nawierzchnia asfaltowa
strengthening
HFRP bar
continuous reinforcement
cement concrete pavement
damage
asphalt pavement
Opis:
Over the course of operation, asphalt road pavements are subjected to damage from car traffic loads and environmental factors. One of the possible methods of strengthening damaged asphalt pavements may be the application of an additional rigid layer in the form of a cement concrete slab with continuous reinforcement. This paper presents a material-technological and structural solution for composite pavement where a cement concrete slab with continuous HFRP bar reinforcement is used for strengthening. Based on laboratory tests, the serviceability of composite bar reinforcement of rigid pavement slabs was shown. A design for strengthening asphalt pavement with a concrete slab with steel bar and corresponding HFRP bar reinforcement was developed. The composition of a pavement cement concrete mix was designed, and experimental sections were formed. Based on laboratory tests of samples collected from the surfaces of experimental sections and the diagnostic tests carried out in “in situ” conditions, the authors will try, in the nearest future (Part II: In situ observations and tests), to confirm the effectiveness of strengthening asphalt pavements with cement concrete slabs with HFRP components.
Źródło:
Archives of Civil Engineering; 2018, 64, 3; 67-80
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ścieżki edukacyjne a zdolności i pozycja społeczna
Effects of Social Origin and Abilities on Educational Choices
Autorzy:
Domański, Henryk
Federowwicz, Michał
Pokropek, Artur
Przybysz, Dariusz
Sitek, Michał
Smulczyk, Marek
Żółtak, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/427797.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nierówności edukacyjne
selekcja szkolna
pochodzenie społeczne
ścieżki edukacyjne
educational inequalities
abilities
social class
family background
tracking
Opis:
Z badań prowadzonych w niektórych krajach wynika, że wybór ścieżki kształcenia może być silniej związany ze zdolnościami uczniów niż z pochodzeniem społecznym. O szansach przechodzenia, czy to do zasadniczej szkoły zawodowej, czy do liceum ogólnokształcącego bardziej decydują wyniki testów psychologicznych niż to, kim byli rodzice. Celem naszej analizy jest ustalenie tego dla Polski. Posługując się danymi z badań panelowych postaramy się stwierdzić, w jakim stopniu zdolności uczniów oddziałują na szanse przechodzenia do szkół średnich i wyższych. Nasze ustalenia wskazują, że niezależnie od pochodzenia społecznego wyższe umiejętności zapewniają więcej szans dostępu do szkół licealnych, najwyżej lokowanych na pierwszym progu selekcji, w porównaniu z technikami i szkołami zawodowymi. Poziom umiejętności jest również istotnym wyznacznikiem szans przechodzenia na studia i różnicuje dostęp do różnych rodzajów uczelni, zapewniając największe szanse podjęcia studiów bezpłatnych w uczelniach państwowych, cieszących się najwyższym prestiżem. Równocześnie, występowanie różnych ścieżek kształcenia jest czynnikiem wzmacniającym bariery selekcji. Absolwenci liceów najczęściej podejmują naukę w uczelniach bezpłatnych, podczas gdy szkoły prowadzone w trybie niestacjonarnym, przyjmujące kandydatów ze słabszymi wynikami i pobierające opłaty, relatywnie częściej przyciągają absolwentów techników.
Research on educational inequalities disclosed that educational choices may be more strongly affected by students’ abilities than by class membership of their fathers. The purpose of this analysis is to establish how these relationships look like in Poland. By using data from panel studies 2014 we attempt to establish to what extent the abilities affect chances of transition to secondary and tertiary schools. According to our findings, higher abilities increase chances of access to lyceums offering general education than to technical secondary and basic vocational schools. The cognitive skills also increase the chances of transition to tertiary education, differentiating access to public universities, which enjoy the highest prestige. Level of cognitive skills is an important determinant of transition to tertiary education and it affects entry to various types of universities, providing the greatest chances of enrolment in freeof-charge public universities. At the same time, our findings confirm that choosing different tracks maintains class divisions in educational career. Graduates of lyceums are more likely to enroll in free-of-charge public universities whereas institutions which offer part-time programs, accept candidates with poorer scores, and charge tuition, are more likely to attract graduates of technical secondary schools.
Źródło:
Studia Socjologiczne; 2016, 1(220); 67-98
0039-3371
Pojawia się w:
Studia Socjologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling and Simulation the Value Stream Mapping – Case Study
Autorzy:
Pekarcíková, Miriam
Trebuňa, Peter
Kliment, Marek
Král, Štefan
Dic, Michal
Powiązania:
https://bibliotekanauki.pl/articles/1841410.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
value stream mapping
Kanban
model
simulation
Opis:
Digitization in the production area represents the integrated planning and management of production and logistics systems and networks based on digital models, methods, and tools, which are built on a common flexible information and communication platform. Currently known and used Lean tools need to be dynamized and oriented to the creation of digital business, where digital models can be heterogeneous, respectively usable in several projects. One of these possibilities is the use of the Lean production method – Value Stream Mapping, the potential of which in the context of the above mentioned is great. The aim of the presented article is based on Gemba analysis of the production process to process the value stream in the environment of the software tool TX Plant Simulation for the needs of flexible reflection on changes in various parameters within the value stream. The case study carried out under this article aims, among other things, to highlight the importance of combining simple Lean Production tools with software in finding, testing, and designing alternative solutions. The potential of using the processed model was also processed for the needs of digitization of business processes in the future.
Źródło:
Management and Production Engineering Review; 2021, 12, 2; 107-114
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Machine learning system for automated blood smear analysis
Autorzy:
Grochowski, Michał
Wąsowicz, Michał
Mikołajczyk, Agnieszka
Ficek, Mateusz
Kulka, Marek
Wróbel, Maciej S.
Jędrzejewska-Szczerska, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/220750.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
optical microscopy
blood cells
biophotonics
image analysis
classification
eigenfaces
neural networks
decision support
nanodiamonds
bioimaging
Opis:
In this paper the authors propose a decision support system for automatic blood smear analysis based onmicroscopic images. The images are pre-processed in order to remove irrelevant elements and to enhancethe most important ones – the healthy blood cells (erythrocytes) and the pathologic ones (echinocytes). The separated blood cells are analysed in terms of their most important features by the eigenfaces method. The features are the basis for designing the neural network classifier, learned to distinguish between erythrocytes and echinocytes. As the result, the proposed system is able to analyse the smear blood images in a fully automatic way and to deliver information on the number and statistics of the red blood cells, both healthy and pathologic. The system was examined in two case studies, involving the canine and human blood, and then consulted with the experienced medicine specialists. The accuracy of classification of red blood cells into erythrocytes and echinocytes reaches 96%.
Źródło:
Metrology and Measurement Systems; 2019, 26, 1; 81-93
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The catalyst-free polytransesterification for obtaining linear PGS optimized with use of 22 factorial design
Autorzy:
Wrzecionek, Michał
Howis, Joanna
Marek, Paulina H.
Ruśkowski, Paweł
Gadomska-Gajadhur, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/2034050.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
poly(glycerol sebacate)
polycondensation
optimization
poli(sebacynian glicerolu)
polikondensacja
optymalizacja
Opis:
Poly(glycerol sebacate) (PGS) is a polyester that is particularly useful for tissue engineering appli- cations. Many researchers have focused on the application and characterization of materials made from PGS. Synthesis is often superficially described, and the prepolymer is not characterized before crosslinking. Considering the different functionality of each monomer (glycerine – 3, sebacic acid – 2), materials with a branched structure can be obtained before the crosslinking process. Branched struc- tures are not desirable for elastomers. In this work, method to obtain linear PGS resins is presented. Moreover, synthesis was optimized with the use of the Design of Experiments method for minimizing the degree of branching and maximizing the molecular weight. The process was described via mathe- matical models, which allows to the association of process parameters with product properties. In this work ca. 1kDa and less than 10% branched PGS resin was produced. This resin could be used to make very flexible elastomers because branching is minimized.
Źródło:
Chemical and Process Engineering; 2021, 42, 1; 43-52
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Redefining the purpose, goals and methods of disinfection in contemporary water supply systems
Autorzy:
Dymaczewski, Zbysław
Jeż-Walkowiak, Joanna
Michałkiewicz, Michał
Sozański, Marek M.
Makała, Aleksandra
Powiązania:
https://bibliotekanauki.pl/articles/204810.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
monitoring
disinfection
water conservation
water safety
multiple barriers
Opis:
This paper presents a new concept of disinfection traditionally applied in water treatment systems. The new definition of this process results from the change in its functionality, aims and methods, which guarantee high quality of water supply. The literature review and technical practice demonstrate a demand for disinfection to act as a functional element of the integrated water distribution system and an active intermediate link between the technology of water treatment and the water distribution network. The presented concept of a disinfection process enables evaluation of water treatment, increases its effectiveness in integrated water treatment systems. Such defined disinfection addresses water conservation and its biological stability within the water supply network. The presented here new concept of disinfection assigns its new role and function in the integrated water distribution system. The controlling and diagnostic function of the disinfection defined in the paper provides a transparent and comprehensive method, with considerable application in experimental design, as well as practical solutions for integrated water distribution systems.
Źródło:
Archives of Environmental Protection; 2020, 46, 1; 85-92
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 18

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