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Wyświetlanie 1-15 z 17
Tytuł:
Geodetic measuring methods and shape estimation of concrete thin shell surface
Autorzy:
Woźniak, M.
Woźniak, K.
Powiązania:
https://bibliotekanauki.pl/articles/224870.pdf
Data publikacji:
2011
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
geometria powierzchnii
pomiary geodezyjne
skanowanie laserowe
geometry of the surface
surveying
laser scanning
Opis:
The geodetic measurements of surface geometry can be performed with new laser scanning technologies. This paper presents the results of such measurements of external surface of cooling tower using Leica TCRP 1201+ tacheometer and Image Station 03 video tacheometer. The overlapping data sets of consecutive scans were investigated in order to propose a method to compound partial surface scans. The data analysis included estimation of systematic errors in common sections of scans. The results of obtained surfaces were compared with precise point measurements using Leica TCRP 1201+.
Źródło:
Reports on Geodesy; 2011, z. 2/91; 81-88
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
E-handel poprawą efektywności logistycznego łańcucha dostaw pomiędzy handlem a klientem detalicznym w dobie kryzysu COVID-19
E-commerce to improve the efficiency of the logistics supply chain between trade and retail customers in the era of the COVID-19 crisis
Autorzy:
Kud, K.
Woźniak, M.
Powiązania:
https://bibliotekanauki.pl/articles/28766441.pdf
Data publikacji:
2022
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Źródło:
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Ekonomika i Organizacja Logistyki; 2022, 7[4]; 37-53
2450-8055
Pojawia się w:
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Ekonomika i Organizacja Logistyki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Food shopping preferences in the context of logistic chains of food supplies on the example of consumers from the Podkarpackie voivodeship
Preferencje zakupowe żywności w kontekście logistycznych sieci dostaw żywności na przykładzie konsumentów z województwa podkarpackiego
Autorzy:
Kud, K.
Woźniak, M.
Powiązania:
https://bibliotekanauki.pl/articles/28766467.pdf
Data publikacji:
2022
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Źródło:
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Ekonomika i Organizacja Logistyki; 2022, 7[1]; 39-52
2450-8055
Pojawia się w:
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Ekonomika i Organizacja Logistyki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A note on the vertex-distinguishing index for some cubic graphs
Autorzy:
Taczuk, K.
Woźniak, M.
Powiązania:
https://bibliotekanauki.pl/articles/2050799.pdf
Data publikacji:
2004
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
edge colouring
vertex-distinguishing colouring
cubic graphs
Opis:
The vertex-distinguishing index of a graph G (vdi (G)) is the minimum number of colours required to colour properly the edges of a graph in such a way that any two vertices are incident with different sets of colours. We consider this parameter for some families of cubic graphs.
Źródło:
Opuscula Mathematica; 2004, 24, 2; 223-229
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Motor vehicle diagnostics in military units
Autorzy:
Markowska, K.
Woźniak, M.
Powiązania:
https://bibliotekanauki.pl/articles/247518.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
motor vehicle diagnostics
vehicle operation
vehicle condition
military-civilian cooperation
transportation support
Opis:
Transport pertains to all functional areas of the State’s activities on every administrative level. Road transport is a very important branch of global economy and constitutes a part of the logistics network. It pertains to the transportation of cargo, items, and people. Cooperation between the branches of civilian transportation and military logistics must be the focus of continuous improvement efforts. Enhancements in this respect can serve to avoid possible failures and disruptions. The quality and availability of infrastructure plays a significant role, not only with respect to civilian, but also military assets. The condition of the vehicle is important for the safety of road transport. The provision of transport services in a military unit should mainly rely on military-civilian cooperation and effective communications. The condition of the means of transportation has been indicated as a factor influencing transport safety. Employing new technology and solutions enables constant improvements to the diagnostic system, broadening the knowledge and enhancing the skills of the motor vehicle driver in terms of proficiency in operating and maintaining the vehicle used.
Źródło:
Journal of KONES; 2018, 25, 2; 245-252
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of damage of the cooling aggregate in vehicle with cold storage chamber
Autorzy:
Woźniak, M.
Batory, D.
Siczek, K.
Powiązania:
https://bibliotekanauki.pl/articles/247607.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
cooling aggregate
combustion engine
sealing ring damage
failure
blurring
agregat chłodniczy
silnik spalinowy
uszkodzenie pierścienia uszczelniającego
niepowodzenie
Opis:
Vehicles with cold storage chambers realize the transport of fast spoil articles. The cooling system of such chamber is its critical subsystem, the essential component of which is a cooling aggregate driven by vehicle combustion engine via belt transmission. The main assembly of the analysed aggregate was the axial five-piston compressor. Small aluminum pistons were led in cylinders in fixed head made of aluminum alloy. Such pistons were driven through steel tappets, mating through their spherical surfaces with spherical seats made in small pistons. Through their front surfaces, placed opposite to the spherical surfaces, the spatial disc cam made of aluminum alloy drove small pistons. The cam was mounted on the steel shaft. The co-operation of described parts was in presence of refrigerant oil. The abrasive and fatigue wear of elements occurred. Because of long-term utilizing of the aggregate the damage of radial sealing ring occurred. Then, external impurities of high hardness got into the contact zone between the mating surfaces. The main aim of the study was to analyse consequences of such fact. The failure was noticed in the form of wear of disc cam, front surfaces of tappets, and the plastic deformation in the spherical surfaces of the seats. Then, due to deformation and the displacements of the rotating shaft, wear of the side surface of disc cam during contacts with small pistons surfaces took place. Moreover, we noticed wear of the side surfaces of the pistons and the cylinders mating with them in the fixed head. In the article, we present figures of damaged surfaces of elements and results of the SEM analysis of spherical surfaces of tappets. The material transfer occurred between the spherical surfaces of tappets and their seats.
Źródło:
Journal of KONES; 2018, 25, 1; 475-482
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Benchmark Tests on Heuristic Methods in the Darts Game
Autorzy:
Książek, K.
Połap, D.
Woźniak, M.
Powiązania:
https://bibliotekanauki.pl/articles/226713.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metaheuristics
optimization
computational intelligence
Opis:
Games are among problems that can be reduced to optimization, for which one of the most universal and productive solving method is a heuristic approach. In this article we present results of benchmark tests on using 5 heuristic methods to solve a physical model of the darts game. Discussion of the scores and conclusions from the research have shown that application of heuristic methods can simulate artificial intelligence as a regular player with very good results.
Źródło:
International Journal of Electronics and Telecommunications; 2018, 64, 2; 115-121
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface modification of bioceramics by PEG grafting
Autorzy:
Adamska, K.
Woźniak, M.
Voelkel, A.
Powiązania:
https://bibliotekanauki.pl/articles/2080008.pdf
Data publikacji:
2010-01-01
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Opis:
Surface modification of Hydroxyapatite (HAp) and β-Tricalcium phosphate (β-TCP) powders was performed using hexamethylene diisocyanate (HMDI) as a coupling agent. Polyethylene glycol (Mw = 2000) was grafted to the surface of these ceramic materials. Different methods were used to characterize modified surfaces. Fourier transform infrared (FT-IR) and Attenuated Total Reflection Fourier Transform Infrared (FTIR/ATR) technique analyses confirmed the modification reaction on HAp and β-TCP surfaces. BET isotherm analysis showed the changes in textural properties of materials after modification. Elemental analysis was performed to confirm a presence of selected elements from modifier and coupling agent. Examination of dispersion stability of materials in different solvents show better stability for samples of β-TCP than HAp.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2010, 65; 31-44
2083-358X
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of practical and theoretical accuracy of wireless indoor positioning system Ubisense
Autorzy:
Woźniak, M.
Odziemczyk, W.
Nagórski, K.
Powiązania:
https://bibliotekanauki.pl/articles/106897.pdf
Data publikacji:
2013
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
positioning systems
RTLS
point tracking
systemy pozycjonowania
punkt śledzenia
Opis:
This paper presents the accuracy investigation results and functionality of Ubisense RTLS positioning system. Three kinds of studies were conducted: test of calibration accuracy, analysis of theoretical accuracy of the coordinates determination as well as accuracy measurements in field conditions. Test of calibration accuracy was made with several different geometric constellation of reference points (tag positions). We determined changes of orientation parameters of receivers and disturbance of positioning points coordinates against chosen reference points constellations. Analysis of theoretical accuracy was made for several receivers spatial positions and their orientations. It allowed to indicate favourable and unfavourable measurement area considering accuracy and reliability. Real positioning accuracy of the Ubisense system was determined by comparison with coordinates measured using precise tacheometer TCRP1201+. Results of conducted experiments and accuracy analysis of test measurement were presented in figures and diagrams.
Źródło:
Reports on Geodesy and Geoinformatics; 2013, 95; 36-48
2391-8365
2391-8152
Pojawia się w:
Reports on Geodesy and Geoinformatics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of inclinometer measurements for relative horizontal displacement investigations on landslide grounds
Autorzy:
Malarski, R.
Nagórski, K.
Woźniak, M.
Powiązania:
https://bibliotekanauki.pl/articles/225439.pdf
Data publikacji:
2013
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
displacement measurements
inclinometric measurements
monitoring
pomiary przemieszczenia
pomiary inklinometrzyczne
Opis:
One of the basic criterion for safety evaluation of structures erected on embankment or sliding slopes is relative horizontal displacement at different elevations. Relative horizontal displacements beneath ground surfaces are performed with inclinometer measurements. This report presents results on horizontal relative ground displacements with the probe SISGEO S242SV30. Investigations were performed with two inclinometer columns 14m height embedded in Warsaw Bank Slope. Mean square error of single observation was determined and mean relative errors of relative displacements in relation to column height. On the basis measurement results several relevant recommendations and practical hints were formulated allowing to avoid survey blunders and discrepancies in measuring procedures often encountered. Detailed inclinometer horizontal displacement measurements results at Warsaw hillside St Ana’s Church grounds were listed and presented.
Źródło:
Reports on Geodesy; 2013, z. 1/94; 6-13
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heuristic algorithm to predict the location of C0 separators for efficient isogeometric analysis simulations with direct solvers
Autorzy:
Paszyńska, A.
Jopek, K.
Woźniak, M.
Paszyński, M.
Powiązania:
https://bibliotekanauki.pl/articles/201497.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
refined isogeometric analysis
finite element method
multi-frontal direct solver
heuristic algorithms
analiza izogeometryczna
metoda elementów skończonych
algorytmy heurystyczne
Opis:
We focus on two and three-dimensional isogeometric finite element method computations with tensor product Ck B-spline basis functions. We consider the computational cost of the multi-frontal direct solver algorithm executed over such tensor product grids. We present an algorithm for estimation of the number of floating-point operations per mesh node resulting from the execution of the multi-frontal solver algorithm with the ordering obtained from the element partition trees. Next, we propose an algorithm that introduces C0 separators between patches of elements of a given size based on the stimated number of flops per node. We show that the computational cost of the multi-frontal solver algorithm executed over the computational grids with C0 separators introduced is around one or two orders of magnitude lower, while the approximability of the functional space is improved. We show O(NlogN) computational complexity of the heuristic algorithm proposing the introduction of the C0 separators between the patches of elements, reducing the computational cost of the multi-frontal solver algorithm.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 6; 907-917
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania biochemiczne krwi chorych na raka jajników w czasie leczenia pochodną akrydyny C-283
Biokhimiczeskie issledovanija krovi bolnykh rakom jaichnikov v teczenii lechenija proizvodnojj akridina C-283
Biochemical investigation of blood of patients with ovarian carcinoma during treatment with C-283 acridine derivative
Autorzy:
Woźniak, M.
Dobryszycka, W.
Gerber, J.
Jabłoński, K.
Powiązania:
https://bibliotekanauki.pl/articles/2189397.pdf
Data publikacji:
1974
Wydawca:
Polskie Towarzystwo Diagnostyki Laboratoryjnej
Tematy:
badania biochemiczne
krew
rak jajnika
dehydrogenaza mleczanowa
izoenzymy dehydrogenazy mleczanowej
leczenie
akrydyna
Źródło:
Diagnostyka Laboratoryjna; 1974, 10, 4; 299-305
0867-4043
Pojawia się w:
Diagnostyka Laboratoryjna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A finite-buffer queue with a single vacation policy: An analytical study with evolutionary positioning
Autorzy:
Woźniak, M.
Kempa, W. M.
Gabryel, M.
Nowicki, R. K.
Powiązania:
https://bibliotekanauki.pl/articles/330346.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
finite buffer queue
evolutionary strategy
object positioning
queueing system
busy period
idle time
single vacation
strategia ewolucyjna
pozycjonowanie obiektu
system kolejkowy
czas bezczynności
Opis:
In this paper, application of an evolutionary strategy to positioning a GI/M/1/N-type finite-buffer queueing system with exhaustive service and a single vacation policy is presented. The examined object is modeled by a conditional joint transform of the first busy period, the first idle time and the number of packets completely served during the first busy period. A mathematical model is defined recursively by means of input distributions. In the paper, an analytical study and numerical experiments are presented. A cost optimization problem is solved using an evolutionary strategy for a class of queueing systems described by exponential and Erlang distributions.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2014, 24, 4; 887-900
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena możliwości włączenia Lasów Sobiborskich do sieci obszarów Important Birds Areas oraz obszarów specjalnej ochrony ptaków
Possibility of inclusion of the Sobibór Forests into Importand Birds Areas and Special Protection Areas networks
Autorzy:
Kanclerska, K.
Karpińska, O.
Woźniak, B.
Grzębkowski, M.
Aftyka, S.
Belcik, M.
Bożycki, L.
Celej, M.
Chodkiewicz, T.
Kuszner, M.
Litwiniak, K.
Pawelec, M.
Pietrasz, K.
Rożycki, A.L.
Sikora, D.
Smith, L.
Stasiak, K.
Szewczuk, W.
Sliwiński, S.
Tylkowski, S.
Woźniak, M.
Woźniak, P.
Wójciak, J.
Żołądek, K.
Keller, M.
Powiązania:
https://bibliotekanauki.pl/articles/985820.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
ochrona przyrody
Lasy Sobiborskie
walory przyrodnicze
fauna
ptaki
ochrona zwierzat
Europejska Siec Ekologiczna Natura 2000
obszary specjalnej ochrony ptakow
bird protection areas
nature 2000 network
Opis:
One of the greatest challenges of nature conservation is to identify and locate networks of protected areas, which will preserve the biodiversity. The paper aims to show the ornithological value of the Sobibór Forests (E Poland) and to emphasize the fact that the network of Important Bird Areas (IBA) and Special Protection Areas within Natura 2000 (SPA) may require additions. The study was conducted in the period of 2008−2016, mainly on forested areas occupying 256 km2. The Sobibór Forests are characterized by a large diversity of habitats, but are mainly covered by Scots pine Pinus sylvestris. High diversity of wetlands and marshlands make the Sobibór Forest unique within the country. Three methodologies were used to estimate population size of chosen species: sampling, census and random observations. 31 species from Annex I of the Birds Directive plus 25 species of SPEC or non−SPECE category were observed which allows to consider this area as one of the most valuable for avifauna in Poland. Six breeding species classify the Sobibór Forests as the IBA and SPA. These species include Black Stork Ciconia nigra (8−13 breeding pairs), Common Crane Grus grus (80−120 breeding pairs), Grey Great Owl Strix nebulosa (0−7 breeding pairs i.e. 50−100% of Polish breeding population), Eagle Owl Bubo bubo (6 breeding pairs), White−backed Woodpecker Dendrocopos leucotos (40−70 breeding pairs) and Grey−headed Woodpecker Picus canus (20−40 breeding pairs). Six other species show potential for qualification, but not enough data has been collected yet. The list of this specie includes: Short−toed Snake Eagle Circaetus gallicus, Common Snipe Gallinago gallinago, Stock Dove Columba oenas, European Nightjar Caprimulgus europaeus, Collared Flycatcher Ficedula albicollis and Bluethroat Luscinia svecica. The Sobibór Forests occupy a small area compared to other IBA forests. However, the number of breeding species classifies the surveyed area as 7th among other IBAs. Moreover all eligible species may be considered as a bioindicators of the natural state of the forest. This is proof of the high natural value of this area.
Źródło:
Sylwan; 2018, 162, 02; 146-154
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations on wear and friction in the SI engine valvetrain
Autorzy:
Woźniak, M.
Banica, C. F.
Diaconu, M.
Ozuna, G.
Jóźwiak, P.
Siczek, K.
Powiązania:
https://bibliotekanauki.pl/articles/133755.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
camshaft bearings
gasket
friction
abrasion wear
lubrication system
łożyska wałków rozrządu
uszczelka
tarcie
zużycie ścierne
układ smarowania
Opis:
The engine valvetrain system operating under insufficient oil lubrication conditions, caused by an incorrect installation of the gasket between the block and the head, was tested. The aim of the analysis was to determine the wear intensity and resistance to motion in camshaft bearings. A model including a camshaft, bearings, tappet-valve-spring subassemblies and a part of the lubrication system was developed. It was used to determine the bearing loads and the amount of oil supplied. The volumetric wear of the camshaft journals and bearing covers was measured. For the estimated engine run, the wear rate and resistance to motion were compared for the cases of the engine with correct and incorrect lubrication.
Źródło:
Combustion Engines; 2018, 57, 4; 53-64
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 17

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