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Wyświetlanie 1-10 z 44
Tytuł:
Black holes: do they exist?
Autorzy:
Malec, Edward
Powiązania:
https://bibliotekanauki.pl/articles/691080.pdf
Data publikacji:
2018
Wydawca:
Copernicus Center Press
Tematy:
history of physics
history of black holes
first observations of black holes
present status of black holes
black holes
Opis:
Black holes entered scientific literature as early as at the end of eighteenth century. They had been known at that time as dark stars, but their concept did not find its way to physics or astronomy, and had been abandoned for more than one hundred years. I shall sketch historical developments and discuss present mathematical and observational status of black holes.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2018, 65
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vertical microzonation of ciliates in cryoconite holes in Ecology Glacier, King George Island
Autorzy:
Mieczan, Tomasz
Tarkowska-Kukuryk, Monika
Górniak, Dorota
Świątecki, Aleksander
Zdanowski, Marek
Adamczuk, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/2051401.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Antarctic
cryoconite holes
protozoa
biodiversity
Źródło:
Polish Polar Research; 2013, 2; 201-212
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of The Degree of the Rivet Hole Sizing on the Fatigue Life
Autorzy:
Lipski, A.
Powiązania:
https://bibliotekanauki.pl/articles/97917.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
fatigue tests
rivets
holes
fatigue life
Opis:
The paper presents the results of fatigue tests of specimens with sized rivet holes. Samples for tests were made of 0.05'' (1.27 mm) thick non-clad plates of aluminium grade 2024-T3. Rivet holes were prepared assuming that they shall be used for 3 mm nominal diameter snap head rivets for aviation-related purposes. Different sizing degrees were achieved by drilling holes of different diameters in the samples followed by the sizing process using a sizing mandrel of the same diameter of 3.15 mm. Holes in the test samples were drilled using special device ensuring appropriate quality and repeatability of the holes. Five different sizing degrees were achieved be means of five drills of different diameters. Samples with holes of varying degrees of sizing were tested under constant amplitude sinusoidal loading conditions (cycle asymmetry coefficient R = 0) at the load frequency of 5 Hz. The study was conducted at three levels of maximum stress in the cycle. Fatigue life test results were presented in the form of fatigue diagrams (regression lines) determined in the bi-logarithmic coordinate system log N, log Smax. The results of the fatigue life tests received for the drilled as well as drilled and reamed holes were also presentedfor comparison. The results obtained lead to the conclusion that that the lowest fatigue life characterises samples with drilled holes and drilled and reamed holes. Fatigue life of specimens with holes for rivets improved (by 50% to 74%, depending on load level), even as a result of the hole surface polishing only (minimum sizing degree), whilst the two-fold growth of fatigue life was achieved for holes of a slight sizing degree. A further significant increase in fatigue life was achieved by the cold work of the hole's surface. Based on the location of the fatigue diagrams and the fatigue life tests results, it may be concluded that the higher a sizing degree, the higher the fatigue life growth. The growth is also proportional to the specimen load level: the lower the load level, the higher the fatigue life growth. Fatigue diagrams obtained from tests were divided into three groups: diagrams for drilled holes and drilled and reamed holes, diagrams for holes with a low degree of sizing and diagrams for holes with a high degree of sizing. This division was confirmed by statistical tests of regression lines parallelism by the “peer-to-peer” method.
Źródło:
Fatigue of Aircraft Structures; 2012, 4; 64-69
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Joint detection of gravitational waves from binary black hole and binary neutron star mergers by LIGO and Virgo
Autorzy:
Królak, Andrzej
Patil, Mandar
Powiązania:
https://bibliotekanauki.pl/articles/690922.pdf
Data publikacji:
2018
Wydawca:
Copernicus Center Press
Tematy:
gravitational waves
neutron stars
black holes
Opis:
Advanced Virgo detector joined advanced LIGO twin detectors on 1st August 2017 in the quest to look for the gravitational waves. The global network of three detectors was operational for 25 days until the LIGO shut down on 25th August 2017. Two gravitational wave events were registered during this period. One of them was the binary black hole merger dubbed as GW170814 and other one is binary neutron star merger referred to as GW170817. Electromagnetic counterpart associated with binary neutron star merger was promptly identified which marks the beginning of multi-messenger astronomy. This article describes these events emphasizing on the crucial role played by the Virgo and focusing on some methodological issues.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2018, 64; 95-115
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelowanie stref zagrożenia dla odwiertów gazowych
Definition of danger zones for gas bore holes
Autorzy:
Bujok, P.
Damec, J.
Drabkova, S.
Jancik, P.
Rado, R.
Powiązania:
https://bibliotekanauki.pl/articles/299562.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
kopalnie
odwierty gazowe
gas bore holes
mining
Opis:
Eksploatacja złóż węglowodorów ciekłych i gazowych ma już długoletnią tradycję. Dlatego coraz częściej spotykamy się z negatywnymi skutkami tej działalności przede wszystkim po zaprzestaniu eksploatacji. Do skutków tych zaliczyć można zanieczyszczenia występujące w środowisku naturalnym, w warstwach powierzchniowych, zanieczyszczonych wodach po niekontrolowanych ucieczkach ropy naftowej w procesie eksploatacji lub przeróbki. Problemem są zlikwidowane przed laty odwierty ropne czy gazowe. Z powodu industrializacji terenów, a także długiego czasu, jaki upłynął od zakończenia eksploatacji, ich stan techniczny pozostawia wiele do życzenia. W pracy przedstawiono niektóre zagadnienia dotyczące prognozowania stref zagrożenia związanych z nieczynnymi już kopalniami ropy i gazu oraz podziemnymi magazynami gazu.
The exploitation of oil and gas has long lasting tradition. Therefore, more and more often there can be found negative results of this activity, above all so called ecologic loads. To these loads belong: a contamination of natural environment, contamination in superficial layer and contamination of water after uncontrolled leaks of rock oil during the mining or processing. Major problem are long closed gas and oil wells. Because of the industrialization of the areas, and also because of the long time, which passed since the end of exploitations, their condition leaves a lot to desire. This paper presents some of the problems concerning technical forecasting of out of operation oil and gas mines contamination zones.
Źródło:
Wiertnictwo, Nafta, Gaz; 2005, 22, 1; 97-103
1507-0042
Pojawia się w:
Wiertnictwo, Nafta, Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Regional features analysis of plugged holes of dense phase gas-solid separation fluidized bed
Autorzy:
Zhang, B.
Zhao, Y.
Luo, Z.
Song, S.
Duan, C.
Dong, L.
Powiązania:
https://bibliotekanauki.pl/articles/109699.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
gas-solid fluidized bed for separation
pressure fluctuation
plugged holes regions
features analysis
plugged holes sensitivity
Opis:
In contrast to traditional coal separation, dry separation does not require water and does not cause water pollution. Dense phase gas–solid fluidized beds are used for dry separation. The plugged holes in the air distributor should be tested to ensure the stability of these beds for particle separation. The pressure fluctuation is sensitive to these plugged holes. This sensitivity can be tested and diagnosed by determining the standard deviation of the pressure fluctuation. In areas with partial blockage, that is the areas with weak fluidization, a decrease in the volume fraction of the particles and in the pressure differences in the transverse of the bed results in an increase of the standard deviation of the pressure fluctuation, thereby stimulating the lateral mixing of medium-sized particles. The standard deviation and the mixing intensity decrease axially. The value of sensitivity of the plugged holes in the air distributor decreases as the height of the bed increases. The features of air distributors affect the surrounding areas. The distribution law determining the influence of plugged holes on the beds is symmetrical. As the blockage of the fluidized bed distributor region increases, the mean square error of the pressure fluctuation in the related regions increases. The intensity of the effect is proportional to the distance to the plugged holes.
Źródło:
Physicochemical Problems of Mineral Processing; 2014, 50, 2; 667-679
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stimulating design creativity by public places in academic buildings
Autorzy:
Yuemin, H.
Linhong, J.
Powiązania:
https://bibliotekanauki.pl/articles/402358.pdf
Data publikacji:
2010
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
creativity
environment
structural holes
public place
campus
Opis:
Design creativity is constrained by the limitations of knowledge of a given designer or even of a design team. Also, each design process is a dynamic process because novel design ideas may emerge spontaneously and their occurrence is unpredictable. One way to increase the probability that novel ideas are produced is to provide designers with additional knowledge, which will expand their design space. The other way is to create an environment stimulating generation of novel ideas. Such an environment should allow and encourage reflection, relaxation, formal and informal interaction among people, and knowledge sharing. The concept of structural hole in sociology is introduced and extended by distinguishing three classes of structural holes: domain, thinking, and working structural holes. It is postulated that an environment with abundance of structural holes can be created by proper public places. Such places should be comfortable to stay and easily accessible and they could be, for example, entrance halls, restaurants, activity centers, or corridors, which are discussed in the paper.
Źródło:
Structure and Environment; 2010, 2. no. 3; 5-13
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Area, depth and elevation of cryoconite holes in the Arctic do not influence Tardigrada densities
Autorzy:
Zawierucha, Krzysztof
Vonnahme, Tobias R.
Devetter, Miloslav
Kolicka, Małgorzata
Ostrowska, Marta
Chmielewski, Sebastian
Kosicki, Jakub Z.
Powiązania:
https://bibliotekanauki.pl/articles/2046817.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
cryoconite holes
ecology
Glaciers
Svalbard
Tardigrada
Źródło:
Polish Polar Research; 2016, 37, 2; 325-334
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wear analysis of a gun barrel drill blade in 1.0503 steel drilling process in Milpro HG12 oil environment with addition of ultra-dispersive copper particles and copper oxides
Autorzy:
Rychlik, Kazimierz
Senderowski, Cezary
Powiązania:
https://bibliotekanauki.pl/articles/298015.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
barrel drill
deep hole drilling
long holes
Opis:
This paper presents structural solutions for guiding a single-sharp barrel drill blade during deep hole drilling, and it analyzes the structural and technological problems associated with two modes of inserting the drill into the processed material in the first stage of drilling – with the use of a pilot hole or a guide sleeve. The kinematics of the object-tool system (P-N) and other technological parameters affecting the execution of pilot holes under strictly defined conditions were analyzed during deep drilling with barrel drills in the FNE 40NC AVIA vertical numerical milling machine. Performance tests involving two types of cooling-lubricating agents, Milpro HG12 oil with and without the addition of ultra-dispersive copper particles and copper oxides (0.05 ÷ 0.6 µm) and Panther GP-1 additive (PWPH PantherOil Poland), applied in a 1:100 ratio, were described. The wear of the barrel drill blade along the entire drilling path (Lw = 8,000 mm) for 112 holes, and the geometric wear coefficient Kw of the drill bit were determined in 1.0503 steel with the use of EB80 drills made of K15 cemented carbide (WC 94%, Co 6%) with a diameter Dc = 8 mm. The results of wear tests were compared with the results of tribological tests involving cooling lubricants and 1.0503 steel with the chemical composition of K15 tungsten carbide. The abrasive wear of friction pair and the performance of the barrel drill blade during deep hole drilling were analyzed under identical conditions.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2019, 22(3); 221-235
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The research on the technological system in deep holes chambering process
Autorzy:
Świć, A
Draczew, O
Szot, T
Majdalawi, S
Powiązania:
https://bibliotekanauki.pl/articles/103152.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
deep holes chambering
technological system
mathematical model
Opis:
Two-mass model of bitool chambering was introduced. Build on its basis mathematical model of deep holes chambering was used to conduct numerical analysis of the system. By optimizing parameters of machine-fixture-part-tool system one can reduce the time of transitory processes, increase dynamic rigidity and decrease tremblings level during deep hole chambering, what allows to increase their accuracy and machining efficiency.
Źródło:
Advances in Science and Technology. Research Journal; 2012, 6, 16; 7-12
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 44

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