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Wyświetlanie 1-15 z 93
Tytuł:
Cohomology of some graded differential algebras
Autorzy:
Andrzejewski, Wojciech
Tralle, Aleksiej
Powiązania:
https://bibliotekanauki.pl/articles/1208485.pdf
Data publikacji:
1994
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Opis:
We study cohomology algebras of graded differential algebras which are models for Hochschild homology of some classes of topological spaces (e.g. homogeneous spaces of compact Lie groups). Explicit formulae are obtained. Some applications to cyclic homology are given.
Źródło:
Fundamenta Mathematicae; 1994, 145, 2; 181-204
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A complement to the theory of equivariant finiteness obstructions
Autorzy:
Andrzejewski, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/1205464.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Opis:
It is known ([1], [2]) that a construction of equivariant finiteness obstructions leads to a family $w_α^H(X)$ of elements of the groups $K_0(ℤ [π_0(WH(X))_α^*])$. We prove that every family ${w_α^H}$ of elements of the groups $K_0(ℤ [π_0(WH(X))_α^*])$ can be realized as the family of equivariant finiteness obstructions $w^H_α(X)$ of an appropriate finitely dominated G-complex X. As an application of this result we show the natural equivalence of the geometric construction of equivariant finiteness obstruction ([5], [6]) and equivariant generalization of Wall's obstruction ([1], [2]).
Źródło:
Fundamenta Mathematicae; 1996, 151, 2; 97-106
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fat bundles and formality
Autorzy:
Andrzejewski, Wojciech
Tralle, Aleksy
Powiązania:
https://bibliotekanauki.pl/articles/1310753.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
fat bundle
formality
symplectic structure
Opis:
We prove the formality property of total spaces of fat bundles over compact homogeneous spaces. Some rational homotopy obstructions to fatness are obtained.
Źródło:
Annales Polonici Mathematici; 1996-1997, 65, 2; 105-118
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Health impact of wind farms
Autorzy:
Kurpas, D.
Mroczek, B.
Karakiewicz, B.
Kassolik, K.
Andrzejewski, W.
Powiązania:
https://bibliotekanauki.pl/articles/49306.pdf
Data publikacji:
2013
Wydawca:
Instytut Medycyny Wsi
Opis:
Introduction and objective: Wind power is employed worldwide as an alternative source of energy. At the same time, however, the health effects of wind turbines have become a matter of discussion. The purpose of this study is a critical review of available reports providing arguments both for and against the construction of wind farms. The authors also attempt to propose recommendations in accordance with the Evidence-Based Medicine (EBM) guidelines. In the case of exposure to wind farms, a randomized controlled trial (RCT) is impossible. To obtain the highest-level recommendations, analysis of case-control studies or cohort studies with control groups should be performed. Preferably, it should include geostatistical analysis conducted with the use of variograms and the kriging technique. Combinations of key words were entered into the Thomson Reuters Web of KnowledgeSM and the Internet search engine Google. Short description of state of the art: The nuisance caused by wind turbines is stereotypically linked with the noise that they produce. Nevertheless, the visual aspect of wind farms, opinions about them, and sensitivity to sound seem to be of the greater importance. To date, the direct correlations between the vicinity of modern wind farms, the noise that wind turbines make, and possible consequences to health have not been described in peer reviewed articles. Health effects are more probably associated with some environmental factors leading to annoyance or frustration. All types of studies share the same conclusion: wind turbines can provoke annoyance. As with any project involving changes in the local environment, a certain level of irritation among the population can be expected. There are elected officials and government representatives who should decide what level of social annoyance is acceptable, and whether wind power advantages outweigh its potential drawbacks. The influence of wind turbines on human emotional and physical health is a relatively new field of research. Further analyses of these issues are justified, especially because none of the studies published in peer-reviewed journals so far meet the criteria for cohort or case-control studies. Summary: Due to methodology, currently available research results do not allow for higher than C-level recommendations. In the case of wind farms, the ideal types of research would be: a retrospective observation of a particular group of residents before and after the wind farm construction, case-control studies or cohort studies with control groups matched in respect of socioeconomic factors, predisposition for chronic diseases, exposure to environmental risk factors, and only one variable which would differentiate cases from controls – the distance between place of residence and a wind farm.
Źródło:
Annals of Agricultural and Environmental Medicine; 2013, 20, 3
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zjawisko artyfikacji jako inspiracja dla ontologii dzieł sztuki
Autorzy:
Andrzejewski, Adam
Powiązania:
https://bibliotekanauki.pl/articles/705465.pdf
Data publikacji:
2013-03-01
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
artyfikacja
dzieła sztuki
ontologia sztuki
metodologia
metaontologia
Opis:
Głównym celem artykułu jest pokazanie, w jaki sposób ontologia dzieł sztuki może czerpać badawcze inspiracje od najnowszych przejawów twórczości artystycznej, częstokroć sytuujących się poza instytucjami sztuki. Artyfikacja, czyli łączenie sztuki z nie-sztuką, jest przykładem takiego fenomenu. W pierwszej kolejności przedstawiam i analizuję pojęcie artyfikacji autorstwa Ossiego Naukkarinena, ze szczególnym uwzględnieniem warunków koniecznych i wystarczających dla jego zajścia. W drugiej części zostaje ukazana ogólna struktura przedmiotów artyfikowanych oraz ich relacja do dzieł sztuki zawierających elementy nie-sztuki. W części trzeciej rozważam, jak badania nad artyfikacją mogą się przyczynić do rozwoju ontologii tradycyjnie pojmowanych dzieł sztuki. Wskazuję tu dwa możliwe pola badań: możliwość substancjalnej zmiany dzieł sztuki w czasie oraz brak tożsamości pomiędzy materią dzieł a ich medium.
Źródło:
Przegląd Filozoficzny. Nowa Seria; 2013, 1; 63-75
1230-1493
Pojawia się w:
Przegląd Filozoficzny. Nowa Seria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Czesław Miłosz and Jerzy Andrzejewski: The Holocaust as Catholic Moral Crisis
Autorzy:
Brenner, Rachel
Powiązania:
https://bibliotekanauki.pl/articles/636166.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Holocaust
Catholicism
genocide
humanism
ethics
Opis:
This article examines the wartime texts produced by two deeply believing Catholics – Jerzy Andrzejewski and Czesław Miłosz. In 1942, at the time of the deportations to Treblinka, these young but already prominent Warsaw men of letters and believing Catholics engaged in a correspondence which examined the ethical crisis of the Jewish genocide and its impact on Christian humanism. Miłosz and Andrzejewski followed their epistolary exchange with literary responses to the 1943 Ghetto Uprising. Whereas the letters conceptualized possibilities of moral restoration, the literary works – Miłosz’s two poems, Campo di Fiori and Biedny Chrześjanin patrzy na getto (A Poor Christian Looks at the Ghetto) and Andrzejewski’s novella Wielki Tydzień (Holy Week) – focused on the devastating impact of the Jewish genocide on their Polish Catholic world. These literary works see the event of the Holocaust as an irrevocable failure of the Catholic dogmas of caritas and love for the Other.
Źródło:
Poznańskie Studia Slawistyczne; 2019, 16; 295-318
2084-3011
Pojawia się w:
Poznańskie Studia Slawistyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Upper Critical Field for Cobalt Oxide Superconductors
Autorzy:
Mierzejewski, M.
Maśka, M.
Andrzejewski, B.
Powiązania:
https://bibliotekanauki.pl/articles/2038388.pdf
Data publikacji:
2004-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Op
74.20.Rp
Opis:
Motivated by the recent discovery of the cobalt oxide superconductors, we calculate the temperature dependence of the upper critical field on a triangular lattice. Using the lattice version of the Gor'kov equations we investigate how the applied magnetic field affects singlet and triplet types of superconductivity. We show that in a wide range of model parameters not only Zeeman coupling, but also the diamagnetic pair breaking mechanism favors the triplet pairing. In the cobalt oxide superconductors the symmetry of the order parameter remains an open problem and both singlet and triplet superconductivity should be taken into account. We show that in such a case, an external magnetic field may induce a transition from singlet to triplet superconductivity. We discuss experimental results which may confirm this tempting hypothesis.
Źródło:
Acta Physica Polonica A; 2004, 106, 5; 603-608
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simple distributed system hardware platform for basic research
Autorzy:
Krzywicki, K.
Andrzejewski, G.
Powiązania:
https://bibliotekanauki.pl/articles/114714.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
distributed systems
embedded systems
simple hardware platform
microcontrollers
Opis:
This paper presents the simple distributed system hardware platform for basic research. It allows to study the different variants and aspects of the data exchange or synchronization methods in distributed systems. Moreover, the platform has the ability to implement distributed embedded systems. The modularity of a system allows for fast reconfiguration of the platform, such as the exchange of end modules. Therefore, it is possible to make quick changes and verify the system operation.
Źródło:
Measurement Automation Monitoring; 2015, 61, 2; 47-50
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The future development of unmanned air vehicles
Autorzy:
Andrzejewski-Popow, Ł.
Kotas, T.
Powiązania:
https://bibliotekanauki.pl/articles/247829.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
autonomy
manned
unmanned
unmanned aerial systems
unmanned aerial vehicles
Opis:
This article introduces the synthetic material for future Unmanned Aerial Systems (UAS). The issues raised in it mainly concern the autonomy of these systems, applied design, propulsion systems, equipment and development trends in the UAS market. In addition, it presents global trends regarding methods of use, application and use of Unmanned Aerial Systems. Observing the growing realm of UAV in military actions it is expected to be the development of autonomous platforms implementing transport and combat missions. Increasingly used UAV platforms in military action jointly with manned platforms (mix formation) and in mixed formations of unmanned (UAV swarms differently equipped). Usage of unmanned aircraft in the civil sphere is very extensive and includes rescue operations – coordination and support, research – geodetic and cartographic, environmental protection, agriculture – monitoring of farmlands, natural resources, system warning of natural disasters; monitoring traffic – map navigation system; taking pictures and videos; data transfer.
Źródło:
Journal of KONES; 2015, 22, 4; 15-20
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
How to improve efficiency of analysis of sequential data?
Autorzy:
Andrzejewski, W.
Królikowski, Z.
Morzy, T.
Powiązania:
https://bibliotekanauki.pl/articles/970825.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
sequential data
indexing
market basket analysis
Opis:
Many of todays database applications, including market basket analysis, web log analysis, DNA and protein sequence analysis utilize databases to store and retrieve sequential data. Commercial database management systems allow to store sequential data, but they do not support efficient querying of such data. To increase the efficiency of analysis of sequential data new index structures need to be developed. In this paper we propose an indexing scheme for non-timestamped sequences of sets, which supports set subsequence queries. Our contribution is threefold. First, we describe the index logical and physical structure, second, we provide algorithms for set subsequence queries utilizing this structure, and finally we perform experimental evaluation of the index, which proves its feasibility and advantages in set subsequence query processing.
Źródło:
Control and Cybernetics; 2009, 38, 1; 107-126
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Criticality calculations for the spent fuel storage pools for Etrr_1 and Etrr_2 reactors
Autorzy:
Aziz, M.
Andrzejewski, K.
Powiązania:
https://bibliotekanauki.pl/articles/146151.pdf
Data publikacji:
2000
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
criticality safety
research reactors
Opis:
A criticality analysis of two spent fuel storage pools for Etrr_1 and Etrr_2 research reactors was performed. The multiplication factor for the pools was calculated as a function of relevant lattice physics parameters. Monte Carlo code MCNP-4A code was used in the criticality calculations. The results were compared with those given by CITATION code and the results obtained formerly during the design phase of the pools [9] with the MONK 6.3 code. Safety of the pools was confirmed.
Źródło:
Nukleonika; 2000, 45, 2; 141-144
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method of passenger car braking and carbon dioxide emissions
Autorzy:
Andrzejewski, M.
Merkisz-Guranowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/242835.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
road transport
car braking
road tests
CO2 emissions
Opis:
The article presents the results of road tests of the passenger car. The aim of this study was to determine the effect of variations in the vehicle braking methods on the carbon dioxide emissions. Inhibited using the gear ratios increase – less gear and using motion resistance while driving a rundown, in addition to using the brake system in the final stages of journeys made. The use of engine braking by drivers as a result of the reduction gear, for example during transport to the intersection, traffic light, railroad crossing, in place of the drive by coasting is particularly emphasized by the promoters of eco-driving. It is raised the issue of avoiding unproductive, from the viewpoint of the work efficiency of the engine, the engine idle speed. The verification of environmental aspects of the use of engine braking was made because of the testing under real traffic conditions. Test drives were carried out at the measuring section, free from traffic. The test vehicle accelerates to a speed of 50 km/h, and then two ways of the speed deceleration were used. The values of the concentration of harmful carbon dioxide in the exhaust gases were achieved by using a mobile apparatus for testing exhaust emissions.
Źródło:
Journal of KONES; 2015, 22, 3; 257-261
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GPU-PLWAH: GPU-based implementation of the PLWAH algorithm for compressing bitmaps
Autorzy:
Andrzejewski, W.
Wrembel, R.
Powiązania:
https://bibliotekanauki.pl/articles/206057.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
data warehouse
GPGPU
bitmap index
bitmap index compression
PLWAH
WAH
Opis:
Bitmap indexes are data structures applied to index- ing attributes in databases and data warehouses. A drawback of a bitmap index is that its size increases when the domain of an indexed attribute increases. As a consequence, for wide domains, the size of a bitmap index is too large to be efficiently processed. Hence, various techniques of compressing bitmap indexes have been proposed. A compression technique incurs some system overhead (mainly CPU) for compression and decompression operations. For this reason, we propose to use additional processing power of graphical processing units (GPUs). In this paper, we present the GPU-PLWAH algorithm that is a parallel implementation of the recently developed PLWAH compression algorithm. GPU-PLWAH was experimentally compared to its traditional CPU version as well as to our previously developed parallel GPU implementation of the WAH compression algorithm. The experiments show that applying GPUs significantly reduces compression/decompression time.
Źródło:
Control and Cybernetics; 2011, 40, 3; 627-650
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic structure calculations of InP-based coupled quantum dot-quantum well structures
Autorzy:
Andrzejewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1160527.pdf
Data publikacji:
2016-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.21.La
73.21.Fg
73.22.Dj
74.50.+r
Opis:
In this work we investigate the electronic structure of coupled 0D-2D nanostructures. The respective confined state energy levels in a quantum dot-quantum well system are calculated for various conduction band offsets - between the quantum dot and surrounding material. The calculated electron and hole energy levels with their wave functions allow determining if the wave functions are within the injector quantum well or within the quantum dot and if the carrier positions on the energy scale are appropriate from the point of view of a possible laser structure utilizing the so-called tunnel injection scheme. It is shown that for an adequate width of an injector quantum well and the conduction band offsets designing an optimal tunnel injection structure is possible.
Źródło:
Acta Physica Polonica A; 2016, 129, 1a; A-97-A-99
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Traffic load detection system
Autorzy:
Zając, W.
Kołopieńczyk, M.
Andrzejewski, G.
Powiązania:
https://bibliotekanauki.pl/articles/393205.pdf
Data publikacji:
2013
Wydawca:
Polskie Stowarzyszenie Telematyki Transportu
Tematy:
microcontroller platform
traffic load detection system
image processing
platforma mikrokontrolera
system wykrywania obciążenia ruchem
przetwarzanie obrazu
Opis:
In the paper there is discussed a solution to detect the communication paths load, in context of use in variable environment. There is presented a system conception and operation algorithm. There is proposed a structure of system to detect traffic lines load, based on a novel microcontroller platform.
Źródło:
Archives of Transport System Telematics; 2013, 6, 3; 47-49
1899-8208
Pojawia się w:
Archives of Transport System Telematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 93

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