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Wyświetlanie 1-15 z 257
Tytuł:
Geological and mineralogical investigation : PAVA project, Italy, Part 1
Autorzy:
Pawlikowski, M.
Such, J.
Powiązania:
https://bibliotekanauki.pl/articles/344007.pdf
Data publikacji:
2009
Wydawca:
nakł. Maciej Pawlikowski
Tematy:
badania geologiczne
badania mineralogiczne
geological investigations
mineralogical investigations
Źródło:
Auxiliary Sciences in Archaeology, Preservation of Relics and Environmental Engineering; 2009, 7; 1-21
1689-6742
Pojawia się w:
Auxiliary Sciences in Archaeology, Preservation of Relics and Environmental Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Review of aeronautical fatigue investigations in Poland during the period May 2009 to March 2011
Autorzy:
Niepokólczycki, A.
Powiązania:
https://bibliotekanauki.pl/articles/213894.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
aeronautical fatigue investigations
Opis:
This review gives the summary of work performed in Poland in the area of aeronautical fatigue during the period from May 2009 to march 2011. The various contributions to this come from the following sources: Air Force Institute of Technology, Warsaw; Warsaw University of Technology, Warsaw; Military University of Technology, Warsaw; Rzeszow University of tTchnology, Rzeszow; Institute of Aviation, Warsaw. The names of the principal investigators and their affiliations are presented in brackets at the end of each chapter.
Źródło:
Prace Instytutu Lotnictwa; 2011, 1 (210); 6-34
0509-6669
2300-5408
Pojawia się w:
Prace Instytutu Lotnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Efficiency of Strontium-90 Desorption Using Iron (III) Solutions in the Decontamination Process of Radioactive Soils
Autorzy:
Cheremisina, O.
Sergeev, V.
Alabusheva, V.
Fedorov, A.
Iliyna, A.
Powiązania:
https://bibliotekanauki.pl/articles/123762.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
decontamination of radionuclides
thermodynamic investigations
kinetics investigations
desorption of strontium-90
iron (III) chloride
Opis:
The paper presents the investigation on the estimated efficiency of iron (III) chloride solutions in the decontamination process of radioactive soils with 90Sr, according to kinetic and thermodynamic characteristics of the desorption process. The specific 90Sr radioactivity of soil samples was (3.9±0.3)·104 Bq·g. The adsorption isotherms of Sr2+ and Fe3+ are described with the Langmuir equation. The values of Gibbs energy G0298 = -4.65 kJ·mol-1 and equilibrium ion exchange constant Keq = 6,5 confirm the hypothesis of strontium removal from soils with iron (III) cations. The effectiveness of the method is substantiated by experimental and calculated results of this study samples of radioactive soils are deactivated in 90% after 9.5 hours, whereas the kinetic constant is 6.77·10 s-1. The suggested method of soil cleanup with 0.2 M Fe3+ solutions is optimal and complies with the environmental requirements.
Źródło:
Journal of Ecological Engineering; 2018, 19, 2; 149-153
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stress drop as a result of splitting, brittle and transitional faulting of rock samples in uniaxial and triaxial compression tests
Autorzy:
Cieślik, J.
Powiązania:
https://bibliotekanauki.pl/articles/178450.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
laboratory investigations
stress drop
triaxial compression
Opis:
Rock samples can behave brittle, transitional or ductile depending on test pressure, rate of loading and temperature. Axial stiffness and its changes, relative and absolute dilatancy, yield, and fracture thresholds, residual strength are strongly pressure dependent. In this paper the stress drop as an effect of rock sample strength loss due to failure was analyzed. Uniaxial and triaxial experiments on three types of rock were performed to investigate the stress drop phenomenon. The paper first introduces short background on rock behavior and parameters defining a failure process under uniaxial and triaxial loading conditions. Stress drop data collected with experiments are analyzed and its pressure dependence phenomenon is described. Two methods for evaluation of stress drop value are presented.
Źródło:
Studia Geotechnica et Mechanica; 2015, 37, 1; 17-23
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research into flows in turbine blade seals. Part III: Numerical calculations versus experiment
Autorzy:
Kosowski, K.
Stępień, R.
Piwowarski, M.
Badur, J.
Powiązania:
https://bibliotekanauki.pl/articles/1955750.pdf
Data publikacji:
2003
Wydawca:
Politechnika Gdańska
Tematy:
turbine seals
CFD calculations
experimental investigations
Opis:
Experimental and theoretical investigations of the pressure field in the shroud clearance were performed on a one-stage air model turbine of the impulse type. Measurements of pressure distribution were carried out for various rotor speeds and turbine loads. 3D calculations of flows in this turbine were performed using the FLUENT CFD code. The calculations were carried out for variants which had been measured experimentally. The experimental data have been compared to theoretical results obtained with 3D codes for turbomachinery calculations. The Sliding Mesh and Multiple Reference methods have given very similar results of average values of pressure distribution and the velocity field in the shroud clearance. These results correspond to the experimental data. The pressure pulsations were determined only by the Sliding Mesh method, and these results have also been compared with the experiment. Stage flow calculations carried by the Sliding Mesh method with a structural shroud mesh and with a minimum number of 2-2.5 million cells have given a range of non-stationary pressure pulsations corresponding to the experimental data.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 3; 329-336
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research into flows in turbine blade seals. Part II: Numerical analysis
Autorzy:
Stępień, R.
Kosowski, K.
Badur, J.
Powiązania:
https://bibliotekanauki.pl/articles/1955751.pdf
Data publikacji:
2003
Wydawca:
Politechnika Gdańska
Tematy:
turbine seals
CFD calculations
experimental investigations
Opis:
3D calculations of an axial model turbine of the impulse type were performed using the FLUENT CFD code. The calculations were carried out for variants which had been measured experimentally. Special attention was paid to the pressure field in the rotor blade shroud clearance. The Multiple Reference Frame method, the Mixing Plane method and the Sliding Mesh method were applied, and meshes of different types and configurations were used for calculations. Only the Sliding Mesh technique appeared to describe non-stationary effects and pressure pulsations in the turbine flow channels and clearances. In this part of the paper, numerical analysis is described, while the comparison between the experimental and the calculated results is presented in part III.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 3; 319-327
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania właściwości ciernych wybranych tworzyw poliuretanowych stosowanych w napędach kolejek szynowych
Investigations of friction properties of selected polyurethane materials used in drive wheels of railways
Autorzy:
Furmanik, K.
Pytko, P.
Matyga, J.
Powiązania:
https://bibliotekanauki.pl/articles/189892.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
tarcie
badania
zużycie
friction
investigations
wear
Opis:
Istotną rolę w dostawach maszyn, urządzeń oraz ludzi do ścian węglowych spełniają kolejki podwieszane i naspodkowe z napędami ciernymi. Ich możliwości transportowe limituje sprzężenie cierne kół napędowych z szynami. Dlatego podstawowe znaczenie w eksploatacji tych kolejek mają dobre własności cierne tworzyw stosowanych na okładziny kół napędowych. W pracy przedstawiono wyniki badań laboratoryjnych współczynnika tarcia oraz zużycia wybranych tworzyw poliuretanowych, które są stosowane na okładziny kół napędowych w kolejkach.
Suspended monorails and floor railways with friction drives play essential role in supply of machines, installations and menriding to faces. Their transport possibilities are limited by friction between the wheels and rails. That is why good friction properties of materials used for the linings of drive wheels are of special importance in railway exploitation. In the paper, the results of laboratory tests concerning the friction coefficient and wear of selected polyurethane materials used in linings of drive wheels in railways are presented.
Źródło:
Tribologia; 2011, 3; 43-53
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of the acoustic waves propagation in non-homogeneous medium
Autorzy:
Baranowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/332534.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
acoustic waves
numerical investigations
KZK equation
Opis:
The aim of the paper is theoretical analysis of acoustic waves propagation in medium which are not homogeneous. The paper presents mathematical model and some results of numerical investigations. The mathematical model was built on the basis of the KZK equation. To solve the problem numerically the finite-difference method was applied. The on-axis pressure and power spectrum density were analysed both in homogeneous and non-homogeneous medium
Źródło:
Hydroacoustics; 2009, 12; 1-8
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Protecting panels for special purpose vehicles
Autorzy:
Rybak, P.
Powiązania:
https://bibliotekanauki.pl/articles/950136.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
special vehicle
strain
structure protecting
investigations
Opis:
Based on available materials, their own research results (numerical and experimental) shows effects of loads of various explosive on special vehicles. Such loads can occur during the fighting in the urban area and mountainous, as well as others with limited space. There were presented directions of research and development works in results leading to increase the level of protection of human in special vehicles against means of fighting, specific to peacekeeping and stabilization missions. Such means may also occur in regular combat operations. Was presented selected results of experimental and model researches of the impact of after explosion shock waves on the hall, crew and inside equipment. Also presented the protective structures designed for special purpose and transportation vehicles. While researches the protective structure was loaded by shock wave pressure generated by unconventional explosive charge (no contact mine expression or improvised explosive device). The paper also identifies the need and possibilities of selection the parameters of efficient panel, for the protected parts of the special or transportation vehicle, against potential threat. The results of studies are qualitative in nature.
Źródło:
Journal of KONES; 2010, 17, 1; 357-364
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structures of Turbulent Vortices in Floodplains of Compound Channels
Autorzy:
Rimkus, A.
Powiązania:
https://bibliotekanauki.pl/articles/241291.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
hydraulic investigations
coherent structure
measurement analysis
Opis:
In turbulent flows, several kinds of vortices and their structures are developed. After physical summation al velocities created by them, they intertwine, and the picture obtained from their measurement chronograms is mostly chaotic. Consequently, these structures become masked. It is therefore very difficult to investigate them and despite many studies performed so far, they have not been sufficiently explored. Favorable conditions for investigations of velocity measurement chronograms occurred when sufficient long intervals were observed, in which the above mentioned masking is minimal. In such intervals, the investigation of turbulent vortices and their structures becomes possible, and it has been performed to some degree. The results of these investigations of the compound channel were already discussed in two previously published articles. The first describes all vortices and their structures in the whole water flow of the compound channel. The second contains a detailed analysis of vortices and their structures in the central vertical of the main channel. This article, discuss investigations of coherent structures formed in the floodplain.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2016, 63, 4; 281-295
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Tribological Properties and the Microstructure Investigations of Tin Babbit with Pb Addition after Heat Treatment
Autorzy:
Leszczyńska-Madej, B.
Madej, M.
Powiązania:
https://bibliotekanauki.pl/articles/355155.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tribological properties
microstructure investigations
heat treatment
Opis:
The results of tribological tests and microstructure examinations of tin babbit with 1.5 % Pb addition after heat treatment are presented in this paper. The specimens were annealed at 150°C for 2, 8, 24 and 48 hours and then tested for wear resistance and Brinell hardness. The wear tests were carried out using a block-on-ring tester operating under dry and wet conditions. The samples were also investigated by light microscopy (LM) and scanning electron microscopy (SEM).
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 1861-1868
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study of the labour market of renewable sources of energy in Poland
Autorzy:
Graczyk, Alicja Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/570190.pdf
Data publikacji:
2014
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
renewable energy sources
labour market
investigations
Opis:
The main purpose of the article is to analyse the renewable energy sources labour market in the country based on the example of survey studies conducted in Lower Silesia in 2010 commissioned by the Marshal’s Office. The author took part in the discussed project as a member of the research team and is the co-author of the final publication. The study was conducted as part of a project by the Department of Economic Development of the Marshal’s Office of the Lower Silesian Voivodeship in 2010 entitled “Prognoses and analyses of the potential of the Lower Silesia to use renewable energy sources”. The article has analysed the following: employment in the RES sector, revenues and savings due to RES, and human resources. The author has also identified the pro-employment effects in the RES sector on the domestic and EU markets; she has also made prognoses for the demand for work in the RES sector. Study results show that the increase of employment in the sector resulting from the increase in production and installed power shall be related to biomass, solar power, and wind power technologies. From the data pertaining to employment in Lower Silesia one may conclude that the RES sector employs mostly specialists, managers, and physical labourers. Unmet demand for physical workers in the forestry and agricultural sectors is visible.
Źródło:
Ekonomia XXI Wieku; 2014, 4(4); 116-125
2353-8929
Pojawia się w:
Ekonomia XXI Wieku
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Journalistic investigations and cabinet crises in the Third Polish Republic (selected examples)
Autorzy:
Adamczyk, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/615935.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
cabinet crisis
journalistic investigations
political scandals
Opis:
This article focuses on the influence of investigative journalism on the system of government, and, in particular, on the functioning and break-up of cabinet coalitions in Poland after 1989. It focuses on the parliamentary-cabinet form of government. The source of conflicts which led to the loss of the necessary trust or accelerated the fall of the government were often crises caused by the work of investigative journalists, in which they disclosed facts uncomfortable for members of the Council of Ministers, related to them either directly, through their own reprehensible activities, or indirectly, through the activities of their closest associates. The aim of this article is to show that the unmasking of scandals involving members of the government, their associates or politicians and officials from their political base is a catalyst that can generate cabinet crises, including the collapse of the government. Analyses show the impact of scandals revealed during the term of office of four governments, that of Waldemar Pawlak, Leszek Miller, Jarosław Kaczyński and Donald Tusk.
Źródło:
Przegląd Politologiczny; 2018, 3; 183-198
1426-8876
Pojawia się w:
Przegląd Politologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania i ocena jakości zapalników do działek morskich po długoletnim przechowywaniu
Qualitative testing and evaluation of fuses for the navy gun ammunition after the long term storage
Autorzy:
Stępień, L.
Piecuch, M.
Powiązania:
https://bibliotekanauki.pl/articles/234989.pdf
Data publikacji:
2006
Wydawca:
Wojskowy Instytut Techniczny Uzbrojenia
Tematy:
zapalniki
badania diagnostyczne
fuses
diagnostics investigations
Opis:
W artykule przedstawiono metodę badania i oceny stanu technicznego zapalników do działek morskich po upływie okresu gwarancyjnego producenta.
A method for testing and evaluation of technical status on the navy gun ammunition fuses after expiring of the manufacturer's warranty time period is presented in the paper.
Źródło:
Problemy Techniki Uzbrojenia; 2006, R. 35, z. 99; 97-102
1230-3801
Pojawia się w:
Problemy Techniki Uzbrojenia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and numerical (FSM) investigations of thin-walled beams with double-box flanges
Badania doświadczalne i numeryczne (FSM) belek cienkościennych z półkami skrzynkowymi
Autorzy:
Paczos, P.
Powiązania:
https://bibliotekanauki.pl/articles/281963.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
thin walled beams
FSM
experimental investigations
Opis:
In the paper, experimental and numerical investigations of thin-walled beams with doublebox flanges were presented. They were a continuation of researches conducted at the Unit of Strength of Materials and Structures at Poznan University of Technology. Numerical results obtained with the Finite Strip Method (FSM) were compared with experimental ones and used for validation of analytical solutions.
W pracy przedstawiono badania doświadczalne i numeryczne belek cienkościennych z półkami skrzynkowymi. Zagadnienie to jest kontynuacją badań przeprowadzonych w Zakładzie Wytrzymałości Materiałów i Konstrukcji Politechniki Poznańskiej. Wyniki numeryczne otrzymane z wykorzystaniem metody pasm skończonych porównano z wynikami uzyskanymi z eksperymentu, a następnie użyto do weryfikacji rozwiązań analitycznych.
Źródło:
Journal of Theoretical and Applied Mechanics; 2013, 51, 2; 497-504
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 257

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