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Wyszukujesz frazę "Laskowski, P" wg kryterium: Autor


Tytuł:
Factors influencing axial compressor stalls
Autorzy:
Laskowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/196204.pdf
Data publikacji:
2017
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
stall
axial compressor
performance
stoisko
sprężarka osiowa
wydajność
Opis:
The article describes the problem regarding stalls in axial compressors, which are widely used in the engines of large and very large transportation aircrafts. The stall phenomenon, unless cleared, poses a major danger to the integrity of a compressor module, which in turn may result in uncontained engine failure and loss of thrust, thereby seriously affecting flight safety. The costs of maintenance to be performed may also be very high, due to irreversible deterioration in some components. A practical assessment of the stall problem and its countermeasures are discussed below.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2017, 95; 89-96
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The computer analysis of the weighting method of radiolocation signal type chirp
Autorzy:
Laskowski, P.
Milewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/332516.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
Article in short form shows simulation researches which apply Doppler distortion on the weighting chirp signal with linear frequency modulation on main lobe duration and distance between main lobe and side lobes. Provide researches include two cases of putting windows coefficient into matched filtering coefficient.
Źródło:
Hydroacoustics; 2007, 10; 93-100
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakterystyki emisji zanieczyszczeń wyznaczane metodą Monte Carlo
Pollutant emission characteristics determined using the Monte Carlo method
Autorzy:
Chłopek, Z.
Laskowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/300837.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
samochody
silniki spalinowe
emisja zanieczyszczeń
metoda Monte Carlo
vehicle
internal combustion engines
pollutant emissions
Monte Carlo metod
Opis:
W pracy przedstawiono pionierski sposób badań ekologicznych właściwości silników spalinowych z zastosowaniem metody Monte Carlo do wyznaczania charakterystyk emisji zanieczyszczeń z pojazdów samochodowych. Formalnie wprowadzono pojęcia oraz usystematyzowano zagadnienia związane z emisją zanieczyszczeń z pojazdów samochodowych. Przedstawiono wyniki badań empirycznych wykonanych dla rzeczywistego obiektu oraz wyznaczono charakterystyki emisji zanieczyszczeń w symulowanych warunkach pseudoprzypadkowych.
This paper presents a pioneering method for investigating the environmental properties of internal combustion engines using the Monte Carlo method to determine the characteristics of vehicle pollutant emissions. Concepts and questions relating to the pollutant emissions of vehicles are formally introduced and systematized. The results of empirical research on a real object are presented, as are the pollutant emission characteristics under simulated pseudo-random conditions.
Źródło:
Eksploatacja i Niezawodność; 2009, 2; 42-51
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of material behaviour for Inconel 718 superalloy using experimental data
Autorzy:
Nieslony, P.
Grzesik, W.
Laskowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/99822.pdf
Data publikacji:
2017
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
modeling
machining
constitutive model
Opis:
In this paper parameters of the Johnson-Cook (J-C) constitutive material model were predicted more accurately based on the static and dynamic material tests and mathematical modelling of relevant response surfaces using specially developed Matlab scripts. Experimental tests were performed under strain rates of 10-3 and 101 1/s and the temperature ranging from the ambient up to 700°C. As a result, a set of mathematical models which fit the experimental data was determined. The experimentally-derived constitutive models were implemented into FEM-based simulations of real machining processes of Inconel 718.
Źródło:
Journal of Machine Engineering; 2017, 17, 3; 75-84
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical 3D FEM Simulation and Experimental Analysis of Tribological Aspects in Turning Inconel 718 Alloy
Autorzy:
Nieslony, P.
Grzesik, W.
Laskowski, P
Zak, K.
Powiązania:
https://bibliotekanauki.pl/articles/99551.pdf
Data publikacji:
2015
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
finite element method
modelling
friction
tribology
Opis:
This paper presents 3D FEM simulation results performed for the power law and JC (Johnson-Cook) material constitutive models for two sets of friction parameters. The friction conditions were tested using pin-on-disc tribometer. Machining tests were carried out using carbide cutting tools coated with a TiAlN monolayer without coolants. The selection of machining conditions was based on real production data. In addition, a real CAD model of the cutting tool insert was implemented. Moreover, an advanced technique of meshing the cutting edge and the grooved rake face was applied. The simulations include cutting forces and cutting temperature. Finally, FEM simulations were compared with measurements in order to improve the simulation strategy.
Źródło:
Journal of Machine Engineering; 2015, 15, 1; 46-57
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Cutting Conditions on Temperature Distribution in Face Milling of Inconel 718 Nickel-Chromium Alloy
Autorzy:
Grzesik, W.
Nieslony, P.
Habrat, W.
Laskowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/99958.pdf
Data publikacji:
2015
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
3D FEM simulation
milling process
nickel-chromium alloy
Opis:
This paper presents 3D FEM simulation results obtained for the milling operations on a nickel-chromium alloy (Inconel 718) using the Johnson-Cook material constitutive model and variable cutting conditions. Face milling tests were carried out using silicon-aluminum-oxygen-nitrogen (SiAlON) ceramic cutting tools inserts. The machining conditions were selected based on real production data (cutting speed of vc=750 and 800 m/min, feed of f=0.1, 0.125 and 0.15 mm/t, depth of cut of ap=1, 1.5 and 2 mm). The FEM simulations include the maximum and average values of the cutting temperature. They were compared with experimental data obtained by using the high speed infra-red camera.
Źródło:
Journal of Machine Engineering; 2015, 15, 2; 5-16
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3D FEM simulations and experimental studies of the turning process of Inconel 718 superalloy
Autorzy:
Nieslony, P.
Grzesik, W.
Żak, K.
Laskowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/99410.pdf
Data publikacji:
2014
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
2D FEM simulation
3D FEM simulation
cutting process
Inconel 718
Opis:
This paper is focused on the finite element analysis of machining of Inconel 718 superalloy in a non-orthogonal (3D) turning process. The cutting experiments were carried out on the cylindrical workpiece of Inconel 718 with the cutting speed of 60-90 m/min, the feed rate of 0.1 mm/rev and different depths of cut. The FEM simulations include the average and maximum interface temperatures, the resultant cutting force and its three components and the chip thickness obtained for the 3D turning process. The simulation results were compared with experimental data obtained in the non-orthogonal process. It was found that the experimental values of the cutting forces are underestimated (about 23-30%) in relation to the FEM simulation data. Additionally, it was noted that the cutting depth has a significant effect on the average interface temperature only when using a non-orthogonal turning process.
Źródło:
Journal of Machine Engineering; 2014, 14, 2; 16-26
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Niezawodność identyfikacji danych w systemach monitoringu
Reliability of data identification in monitoring systems
Autorzy:
Łubkowski, P.
Laskowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/155323.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
monitoring
identyfikacja
niezawodność
identification
reliability
Opis:
Systemy monitoringu wideo od szeregu lat wykorzystywane są w celu zwiększenia poziomu bezpieczeństwa nadzorowanych obiektów i dóbr materialnych. W każdym z wymienionych zastosowań niezwykle istotnym zagadnieniem jest niezawodność procesów nadzoru i monitorowania. W artykule przedstawiono analizę wpływu oświetlenia, odległości obiektu od sensora czy rozdzielczości sensora na poprawną identyfikację. Przeprowadzone badania umożliwiają określenie przydatności systemu monitoringu w określonych warunkach środowiskowych i technicznych.
Nowadays, many areas have to be protected. Monitoring systems (MS) effectively support this kind of processes. A monitoring system provides an image of the area containing the monitored objects. These systems are also used to increase the safety of people. That is why the efficiency is important in the reliable monitoring system (RMS). These issues are interpreted as the possibility of correct identification of the collected data. The reliability of elements, the environmental exposure as well as the process of object detection and face identification analysis have important impact on the MS. Therefore, the main problem of the research is to answer the question: what is the reliability of the identification data (i.e. people) in the real-time monitoring system? The paper presents the main results of the study. The study was conducted in the MS demonstrator consisting of a telecommunication network with implemented video monitoring sensors. Various experiments were performed to adjust the lighting, the distance from the camera and the number of face images in the database. The developed method has to determine the reliability of the identification data. It takes into account the influence of degrading factors which are present in the monitoring system environment. On the basis of the obtained results we specify a set of recommendations for the reference MS.
Źródło:
Pomiary Automatyka Kontrola; 2014, R. 60, nr 9, 9; 760-763
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Concept of cloud computing implementation as a platform for telemetry systems
Autorzy:
Stąpór, P.
Laskowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/393227.pdf
Data publikacji:
2017
Wydawca:
Polskie Stowarzyszenie Telematyki Transportu
Tematy:
cloud computing
telemetry systems
IaaS
systemy telemetryczne
Opis:
Nowadays operated telematics systems offer a large collection of different types of services requiring an effective transmission of data in complex structures. It is possible by the implementation of the present network solutions for the future of telecommunications and information technology. A high level of requirements for the quick access to transport resources and databases impose the necessity of making a number of processing operations information in a short time. Single computing machines are not able to do that. Therefore, the dynamic evolution is observed to combine the processing power of cloud computing. The advantage of this solution is a fulfillment of the requirements of security, reliability and quality while reducing costs. The authors of the article presented the concept of the use of private cloud for handling traffic between major railway hubs. Basis for this is representative model CC called „infrastructure as a service” designed for heterogeneous structures.
Źródło:
Archives of Transport System Telematics; 2017, 10, 2; 37-43
1899-8208
Pojawia się w:
Archives of Transport System Telematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of video quality in the process of events identification in the transportation systems
Autorzy:
Łubkowski, P.
Laskowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/393201.pdf
Data publikacji:
2018
Wydawca:
Polskie Stowarzyszenie Telematyki Transportu
Tematy:
surveillance services
identification
transportation systems
usługi nadzoru
identyfikacja
systemy transportowe
Opis:
The process of monitoring vehicle traffic and detecting traffic incidents and traffic obstructions requires access to information from sensors located at various points of monitoring and data acquisition systems constituting elements of contemporary Intelligent Transportation Systems (ITS). Unmanned aerial vehicles (UAVs) are increasingly becoming an element of ITS used in reconnaissance, preventive or rescue operations. Ensuring the efficiency of transportation in conditions of increased traffic requires providing users with multimedia information about: meteorological conditions prevailing on roads, traffic, current events and difficulties, and information on the availability of parking spaces. In each of the mentioned cases, the reliability and quality of information provided with the use of UAVs is an extremely important issue. Therefore, the provision of video surveillance services with a predictable level of quality and reliability is an important challenge for UAVs practical implementations. Thus, the fundamental research problem considered in the publication is the analysis of the impact of environmental and technical parameters on the quality and reliability of the UAVs video monitoring service provided in a real operating environment.
Źródło:
Archives of Transport System Telematics; 2018, 11, 2; 24-29
1899-8208
Pojawia się w:
Archives of Transport System Telematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mobile and reliable data access to telematics data systems
Autorzy:
Laskowski, D.
Lubkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/393409.pdf
Data publikacji:
2016
Wydawca:
Polskie Stowarzyszenie Telematyki Transportu
Tematy:
data transfer
mobile access
reliability
telematics system
BYOD
transfer danych
dostęp mobilny
niezawodność
system telematyczny
Opis:
The perspective of use the Bring Your Own Device (BYOD) model in telematics environment which ensure a reliable access to network resources is presented in the paper. The BYOD model is a future-proof solution which applies in areas related to database systems. It provides the user wireless access with the use of 802.11n/ac/d standard, mobile access via WiMax-2 or LTE-A networks and wired with the use of Gigabit Ethernet technology. The research network which reflects the events representative for the telematics environment was established for the verification of functional capabilities of BYOD model. Services that offer a user the synchronization of files between mobile terminals and data server were implemented in testbed. A detailed set of test scenarios and criteria for assessment of the declared properties model BYOD were also defined. The article presents the results of research that confirm the use of this type of networking solutions for mobile and reliable access to data in a telematics environment.
Źródło:
Archives of Transport System Telematics; 2016, 9, 2; 31-34
1899-8208
Pojawia się w:
Archives of Transport System Telematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Supporting the monitoring services reliability in transportation systems – antropo-technical approach
Autorzy:
Laskowski, D.
Łubkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/393976.pdf
Data publikacji:
2015
Wydawca:
Polskie Stowarzyszenie Telematyki Transportu
Tematy:
monitoring system
data acquisition systems
service reliability
system exploitation
system monitoringu
zbieranie danych
niezawodność usług
eksploatacja systemu
Opis:
Process of ensuring the security of citizens, objects and material goods requires access to the information from sensors located in diff erent points of monitoring and data acquisition systems. Th ey are a widely used in administration of carfleet or the visualization of selected functions of transport processes. However, transmission of data from multiple video sensors may lead to the degradation of video quality and even to lack of identification capabilities. As a result, the overall service reliability can be decreased. The process of the system exploitation can determine the reliability of the video monitoring services as well. This process includes the technical object (hardware and soft ware) and the man (operator) who exploits the system under certain environmental conditions (external and internal) and represents so called antropo-technical approach in which the operating requirements are taken into consideration (particularly related to reliability). The paper presents components elaborated for maintenance of reliable video monitoring services as well as the results of selected tests showing its efficiency. Proposition of comprehensive metrics for assessing the reliability of exploitation of video monitoring system, which takes into account antropo-technical approach is presented as well.
Źródło:
Archives of Transport System Telematics; 2015, 8, 4; 23-28
1899-8208
Pojawia się w:
Archives of Transport System Telematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Species identification and phylogenetic analysis of six species of Diplostomum Nord. [Digenea]
Autorzy:
Niewiadomska, K.
Borsuk, P.
Laskowski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/837536.pdf
Data publikacji:
1998
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
Diplostomum mergi
Diplostomum paracaudum
Diplostomum baeri
Diplostomum
metacercaria
Diplostomum parviventosum
Diplostomum spathaceum
Diplostomum pseudospathaceum
cercaria
Digenea
identification
Źródło:
Annals of Parasitology; 1998, 44, 3
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Red fox [Vulpes vulpes] a new host species for acanthocefalan Moniliformis moniliformis [Bremser, 1811] in Poland
Autorzy:
Kazimierczak, K
Gorski, P.
Laskowski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/838526.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
parasite
red fox
Acathocephala
Polska
Vulpes vulpes
parasitology
Moniliformis moniliformis
new host
host
fox
Opis:
Acanthocephalan Moniliformis moniliformis is a parasite of rodents, rarely also reported from carnivorous mammals. One female specimen of this parasite has been found in the small intestine of red fox Vulpes vulpes. It is the first report about this species invading the red fox in Poland.
Źródło:
Annals of Parasitology; 2006, 52, 2
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wykorzystanie rzeczywistości rozszerzonej w życiu codziennym
Augmented reality : the way to using advanced technology in normal life
Autorzy:
Laskowski, M.
Rawski, M.
Szadura, P.
Powiązania:
https://bibliotekanauki.pl/articles/408098.pdf
Data publikacji:
2013
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
Layar
rzeczywistość rozszerzona
smartfon
wirtualny przewodnik
augmented reality
smartphone
virtual guide
Opis:
W ostatnich latach gwałtowny rozwój telefonii komórkowej powoduje powstawanie nowych interesujących technologii, takich jak system Layar wykorzystujący rozszerzoną rzeczywistość. Jest to platforma wzbogacająca otaczający nas świat o cyfrowe informacje. Poniższy artykuł opisuje wykorzystanie tej technologii w tworzeniu wirtualnego przewodnika po uczelni, wspierającego bezproblemowe poruszanie się po terenie kampusu. Zawiera on opis problemu, technologie wykorzystywane w tym projekcie oraz zastosowanie go w prawdziwym życiu.
The rapid growth of smartphone market share is a key factor for both developing and implementing many solutions dedicated to mobile devices. One of the most promising technologies is Layar - a mobile platform for discovering digital information about the physical world using Augmented Reality (AR). This paper describes the implementation of Layar in creating a virtual guide of university campus in order to help finding particular buildings and other kinds of campus information needed. The issues of creating an information layer containing all the necessary information about the campus buildings are also discussed.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2013, 2; 37-40
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł

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