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Wyświetlanie 1-15 z 113
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:
On solvability of elliptic boundary value problems via global invertibility
Autorzy:
Bełdziński, Michał
Galewski, Marek
Powiązania:
https://bibliotekanauki.pl/articles/255201.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
diffeomorphism
Dirichlet conditions
Laplace operator
Neumann conditions
uniqueness
Opis:
In this work we apply global invertibility result in order to examine the solvability of elliptic equations with both Neumann and Dirichlet boundary conditions.
Źródło:
Opuscula Mathematica; 2020, 40, 1; 37-47
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3E - A new paradigm for the development of civil aviation
Autorzy:
Orkisz, Marek
Kuźniar, Michał
Powiązania:
https://bibliotekanauki.pl/articles/2097457.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
airplane
electric propulsion
hybrid propulsion
distributed propulsion
reduction of emission exhaust
reduction of noise
decrease of fuel consumption
samolot
napęd elektryczny
napęd hybrydowy
napęd rozproszony
redukcja emisji spalin
redukcja hałasu
zmniejszenie zużycia paliwa
Opis:
Nowadays, in civil aviation, issues related to improving efficiency, reducing the costs of air operations as well as the negative impact of air transport on the environment are of increasing importance. These ideas allow the formulation of the paradigm relating to the development of air transport - ‘more Efficiently, more Economically, more Eco-friendly - 3E’. The article presents in a cross-sectional and synthetic way research conducted by leading scientific centres around the world as well as prototype aviation constructions designed by companies from the aviation industry. Benefits and disadvantages of future propulsions, such as purely electric, hybrid and distributed propulsions, were presented. Conclusions were formulated regarding further possible directions of civil aviation development, taking into account the improvement of its efficiency as well as economic and ecological indicators.
Źródło:
Combustion Engines; 2020, 59, 2; 3--10
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation as a Method of Choosing the Order Picking Concept
Autorzy:
Gałązka, Marek
Jakubiak, Michał
Powiązania:
https://bibliotekanauki.pl/articles/504108.pdf
Data publikacji:
2010
Wydawca:
Międzynarodowa Wyższa Szkoła Logistyki i Transportu
Opis:
The analysis of the three, main, heuristics approaches outlining the order picking routes in a warehouse, is a subject of this paper. Order picking is the most laborious warehouse process and it contributes to 55% - 65% of all the costs of operations performed in a warehouse. The most time consuming order picking activity, according to the research, is transfer which is closely related to, adopted by a given company, system of transfer and movement between the points of taking the order, places of pick up, and points of release. Even the small shifts of commodities, on short distances, play a very important part in modern dynamic economy. On the basis of a simple model of a warehouse owned by an authentic company, a computer program was created, which helps in simulation of the three, main heuristics approaches to outline the routes, so as to make the order picking process as short as possible.
Źródło:
Logistics and Transport; 2010, 11, 2; 81-88
1734-2015
Pojawia się w:
Logistics and Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the application of distributed propulsion to the AOS H2 motor glider
Autorzy:
Kuźniar, Michał
Orkisz, Marek
Powiązania:
https://bibliotekanauki.pl/articles/244774.pdf
Data publikacji:
2019
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
aircraft engineering
engines
mechanical engineering
Opis:
The paper describes the selection of a distributed propulsion for the AOS H2 motor glider (selection of engines, their number, and propellers) and determination of its performance. This analysis is related to the research conducted on environment friendly and hybrid propulsions in various research centres. The main aim of the analyses conducted is to increase the performance of vehicles powered by electric motors. The batteries have a low density of energy, i.e. the ratio of mass to cumulated energy. Instead of a battery set, it is possible to apply a hybrid- electric system, where the combustion engine works as a generator or an electric-hydrogen generator, where the hydrogen cell supports a small set of batteries. One of such flying vehicles, fitting in this trend, is the AOS H2 motor glider built at the Rzeszow University of Technology in cooperation with other universities. It is a hybrid aircraft, equipped with a hydrogen cell, which together with a set of batteries is a source of electricity for the Emrax 268 electric motor. To increase the vehicle's performance (the range and flight duration), it is possible to use a distributed propulsion. This type of propulsion consists in placing many electric motors along the wingspan of the aircraft. Appropriate design of such a system (propeller diameters, engine power, number of engines) can improve the aerodynamic and performance parameters of the airframe. An analysis of the performance for the selected flight trajectory for this propulsion variant was conducted and compared to the performance of the AOS H2 motor glider equipped with traditional propulsion. The consumption of hydrogen was also determined for both systems. The results obtained were presented in the diagrams and discussed in the conclusions.
Źródło:
Journal of KONES; 2019, 26, 2; 85-92
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On unique solvability of a Dirichlet problem with nonlinearity depending on the derivative
Autorzy:
Bełdziński, Michał
Galewski, Marek
Powiązania:
https://bibliotekanauki.pl/articles/256038.pdf
Data publikacji:
2019
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
diffeomorphism
uniqueness non-potential problems
variational methods
monotone methods
Palais-Smale condition
Opis:
In this work we consider second order Dirichelet boundary value problem with nonlinearity depending on the derivative. Using a global diffeomorphism theorem we propose a new variational approach leading to the existence and uniqueness result for such problems.
Źródło:
Opuscula Mathematica; 2019, 39, 2; 131-144
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
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:
The potential to improve air quality by increasing the use of deep geothermal energy
Autorzy:
Hajto, Marek
Kaczmarczyk, Michał
Powiązania:
https://bibliotekanauki.pl/articles/2124697.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
air pollution
equivalent emission factors
deep geothermal energy development
emission inventory
Polska
Opis:
Increasing the use of geothermal energy may be one of the tools bringing us closer to achieving the European Commission’s objective of reducing greenhouse gas emissions by 55% by 2030. Air quality improvement plays a strategic role in achieving sustainable energy development. Both European and national legislation in this field is particularly comprehensive and effective, establishing rules for monitoring and preventing air pollution in order to avoid adverse effects on human health and the environment. Unfortunately, the effective air pollutions monitoring network currently in place in Poland, with 156 monitoring stations, mainly concerns agglomerations and cities with over 100,000 inhabitants. The lack of information on the state of pollution in smaller towns is a significant limitation in terms of research aimed at assessing the effects of corrective measures taken, such as the possible transformation of district heating systems based on RES, including the use of deep geothermal energy. This paper proposes some solutions which allow the effective estimation of air conditions in locations not covered by environmental monitoring, in the context of the potential to develop geothermal resources in the rich geothermal province of Central Poland.
Źródło:
Geology, Geophysics and Environment; 2022, 48, 2; 147---175
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
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:
Error simulations of uncorrected NDVI and DCVI during remote sensing measurements from UAS
Autorzy:
Chiliński, Michał T.
Ostrowski, Marek
Powiązania:
https://bibliotekanauki.pl/articles/2037392.pdf
Data publikacji:
2014-06-25
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Tematy:
Remote sensing
vegetation index
digital camera
UAS
atmospheric correction
Opis:
Remote sensing from unmanned aerial systems (UAS) has been gaining popularity in the last few years. In the field of vegetation mapping, digital cameras converted to calculate vegetation index (DCVI) are one of the most popular sensors. This paper presents simulations using a radiative transfer model (libRadtran) of DCVI and NDVI results in an environment of possible UAS flight scenarios. The analysis of the results is focused on the comparison of atmosphere influence on both indices. The results revealed uncertainties in uncorrected DCVI measurements up to 25% at the altitude of 5 km, 5% at 1 km and around 1% at 0.15 km, which suggests that DCVI can be widely used on small UAS operating below 0.2 km.
Źródło:
Miscellanea Geographica. Regional Studies on Development; 2014, 18, 2; 35-45
0867-6046
2084-6118
Pojawia się w:
Miscellanea Geographica. Regional Studies on Development
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:
Hip joint arthroscopy in professionally active patients with osteoarthritis
Autorzy:
Drobniewski, Marek
Synder, Marek
Skrzypek, Michał
Pstrągowski, Kajetan
Polguj, Michał
Borowski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/2161984.pdf
Data publikacji:
2019-02-27
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
degenerative disease
return to work
arthroscopy
hip joint
WOMAC
Harris Hip Score
Opis:
Objectives The primary endpoints of the study were to assess the effectiveness of hip joint arthroscopy in the treatment of femoroacetabular impingement (FAI) in patients with joint gap stenosis and to determine if and how quickly patients were able to return to work and physical activity. Material and Methods The prospective study of patients undergoing hip joint arthroscopy due to pain in FAI has been conducted. They were divided into 2 groups depending on the degree of the radiological examination. The criterion was the width of the joint gap. The study group involved 47 patients with hip joint gap of 2–3 mm, identified by means of the standardized X-ray examination. The control group consisted of 45 patients with hip joint gap > 3 mm. The post-operative follow-up period of the patients lasted at least 2 years. In addition, the Western Ontario McMaster Universities Osteoarthritis Index (WOMAC) questionnaire together with Harris Hip Score (HHS) were applied. The patients were also evaluated for the post-operative time period enabling return to work. Results All the patients after hip joint arthroscopy returned to normal physical activity within 12 weeks after operation, enabling their return to work. However, it should be noted that during the post-operative follow-up, pain sensations either recurred or did not regress in 37 patients in the study group and 12 patients in the control group after treatment. The nearly equal results of the WOMAC questionnaire and HHS before operation significantly vary between both groups in the last follow up. In the study group they did not change expressively. Conclusions Despite the little invasiveness, hip joint arthroscopy in patients with joint gap stenosis brings about the far from satisfactory results. This procedure is not worth considering. Despite unsatisfactory pain relief, patients decided to returned to work, due to their occupational position and for fear of losing the job due to long absenteeism. Int J Occup Med Environ Health. 2019;32(1):115–20
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2019, 32, 1; 115-120
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ecologically and Economically Effective Methods of Coal Bed Methane Using
Efektywne ekologicznie i ekonomicznie metody wykorzystania metanu pokładów węgla
Autorzy:
Napieraj, Sebastian
Borowski, Marek
Karch, Michał
Powiązania:
https://bibliotekanauki.pl/articles/319210.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
metan
odmetanowanie
ślad węglowy
ochrona środowiska
górnictwo
methane
gas drainage
carbon footprint
environmental protection
mining
Opis:
CBM are ecological fuel obtained by two ways: during coal mining or by specially made holes from surface to the virgin seam or abandoned coal mines. Increased demand for electricity and implementation of CO2 emissions get more profitable investing in modern technologies, especially local power plants fueled by CBM. Article presents possible main technologies for the use of CBM.CMM on the background of forecasting an increase in electricity prices and the cost of purchasing CO2 emission allowances.
Metan pokładów węgla jest ekologicznym paliwem pozyskiwanym dwoma drogami: podczas wydobywania węgla kamiennego lub za pomocą specjalnie wykonanych otworów z powierzchni do pokładów dziewiczych lub zlikwidowanych kopalń węgla. Zwiększone zapotrzebowanie na energię elektryczną oraz konieczność zmniejszenia emisji CO2 do atmosfery powodują, że coraz korzystniejsze jest inwestowanie w nowoczesne technologie, szczególnie lokalne moce wytwórcze oparte o paliwo jakim jest metan pokładów węgla. Artykuł przedstawia możliwe główne technologie wykorzystania metanu pokładów węgla na tle prognozy zwiększania ceny energii elektrycznej oraz kosztów zakupu uprawnień do emisji CO2.
Źródło:
Inżynieria Mineralna; 2019, 21, 1/2; 279-286
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rescue excavations on the Late Roman period settlement on site 3 in Zagórzyce, com. and distr. Kazimierza Wielka, voiv. Świętokrzyskie
Autorzy:
Grygiel, Michał
Pikulski, Jacek
Trojan, Marek
Powiązania:
https://bibliotekanauki.pl/articles/442443.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Jagielloński. Instytut Archeologii
Tematy:
Zagórzyce 3
Funnel Beaker Culture
Trzciniec Culture
Late Roman Period
Opis:
During archaeological research carried out in Zagórzyce area a small multicultural site (numbered as 3) was discovered. It is situated opposite to the excavated site no. 1 and the adjacent site no. 2. All these sites make a settlement complex functioning with varying intensity during the La Tène and Roman Prriods. During surface surveys and small rescue explorations conducted at sites 3 in 2003 remains from the Neolithic period (Funnel Beaker culture), the Older Bronze Age (Trzciniec culture) and from the Late Roman Period were recorded. The inventory of the explored feature of unknown function should be connected with the latter chronological horizon.
Źródło:
Recherches Archéologiques Nouvelle Serie; 2009, 1; 277-294
0137-3285
Pojawia się w:
Recherches Archéologiques Nouvelle Serie
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 113

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