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Wyświetlanie 1-15 z 137
Tytuł:
Ku Band Bethe Hole Coupler Using Gap Waveguide Technology
Autorzy:
Nematpour, Efat
Ostovarzadeh, Mohamad Hossein
Razavi, Seyed Ali
Powiązania:
https://bibliotekanauki.pl/articles/308679.pdf
Data publikacji:
2019
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
Bethe hole coupler
multi-hole coupler
groove gap waveguide
Opis:
The gap waveguide technology is a new technique used for designing and fabricating microwave components, ensuring a low-loss and easy fabrication process, especially at high frequencies, and allowing for the production of multilayer structures due to the lack of requirement of an electrical connection between the metal layers of the waveguide structure. This paper presents the design and areas of implementation of single-hole and multi-hole 20 dB Bethe couplers, using the groove gap waveguide (GGW) technology for Ku band. Simulation results show that the operating bandwidth of the proposed design is over 40% wider, and its isolation rate is more than 25 dB higher. By using the multi hole configuration, a bandwidth that is more than 59% wider and the isolation rate of over 30 dB may be obtained.
Źródło:
Journal of Telecommunications and Information Technology; 2019, 3; 70-74
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ekomuzea – nowy produkt turystyczny na przykładzie ekomuzeum Hołe
Autorzy:
Buczek - Kowalik, Małgorzata
Mitura, Teresa
Klamár, Radoslav
Powiązania:
https://bibliotekanauki.pl/articles/763158.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
tourism product
ecomuseum
Hołe ecomuseum
produkt turystyczny
ekomuzeum
ekomuzeum Hołe
Opis:
The article presents ecomuseum as an example of innovative tourism product, created primarily in rural areas. The subject for analysis provided the offer of one of the Carpathian ecomuseums – Hołe ecomuseum.Ecomuseums tourist product is created on the basis of local resources – accommodation services, catering, local products and grass-roots community initiatives. When creating it, a numberof factors should be considered, including environmental, social, cultural, economic and political conditions.Ecomuseum as a tourist product has some specific features, which enable us to call it ecoproducts.This type of products may be attractive for tourists who want to broaden their knowledge on the history and culture of the region, for tourists longing for a close contact with unspoiled nature,away from large urban agglomerations
Artykuł nie zawiera abstraktu w języku polskim.
Źródło:
Annales Universitatis Mariae Curie-Sklodowska, sectio B – Geographia, Geologia, Mineralogia et Petrographia; 2013, 68, 1
0137-1983
Pojawia się w:
Annales Universitatis Mariae Curie-Sklodowska, sectio B – Geographia, Geologia, Mineralogia et Petrographia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical modelling of a disc weakened by an eccentric circular hole
Modelowanie matematyczne dysku osłabionego mimośrodowo umiejscowionym otworem kołowym
Autorzy:
Bizić, M.
Petrović, D.
Pancić, D.
Dinović, Z.
Powiązania:
https://bibliotekanauki.pl/articles/281727.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
modelling
disc
eccentric hole
Opis:
The task of this paper is identification of stresses in a homogeneous isotropic disc weakened with an eccentric circular hole which is loaded by pressure in the internal contour of the hole. By application of a complex variable method, the mathematical model that allows complete analytical solution of stresses of the disc is formed. The methodology can be applied for the solution of any disc weakened with an eccentric circular hole. The comparative analysis has shown a high accuracy of analytically obtained results with FEM results obtained by calculations in ANSYS 12 software package. The application of the results of this paper is of great importance for quality design and optimization of thin-walled structures of disc type weakened by a circular hole.
Zadaniem podjętym w artykule jest identyfikacja stanu naprężeń w jednorodnym, izotropowym dysku osłabionymmimośrodowo umiejscowionymwycięciem kołowym, obciążonym wzdłuż brzegu wewnętrznym naciskiem. Stosując metodę zmiennej zespolonej, w pracy sformułowano matematyczny model układu, który pozwolił na uzyskanie w pełni analitycznego opisu rozkładu naprężeń w dysku. Zastosowana metodologia, zdaniem autorów, może być użyta dla dowolnego dysku z mimośrodowym otworem o kształcie koła. W pracy przeprowadzono ponadto analizę porównawczą z wynikami uzyskanymi numerycznie za pomocą metody elementów skończonych z wykorzystaniem pakietu ANSYS 12. Otrzymane rezultaty badań mogą mieć duże znaczenie praktyczne z punktu widzenia jakości projektowania i optymalizacji cienkościennych konstrukcji zawierających elementy strukturalne z kołowym wycięciem.
Źródło:
Journal of Theoretical and Applied Mechanics; 2012, 50, 4; 1097-1108
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Is there a limit of matter divisibility?
Autorzy:
Jacyna-Onyszkiewicz, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/703143.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
black hole
entropy
holographic principle
Opis:
Investigation of the thermal properties of the black holes by the quantum statistical mechanics has implied that matter cannot be divided to infinity because the number of independent parameters completely describing a subject of a limited volume is finite.
Źródło:
Nauka; 2007, 3
1231-8515
Pojawia się w:
Nauka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mid-infrared polarization beam splitter based on square/circular hybrid air holes with wide bandwidth and ultrashort length
Autorzy:
Zheng, Guang-Ming
Powiązania:
https://bibliotekanauki.pl/articles/2172822.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
polarization beam splitter
mid-infrared
photonic crystal fibre
bandwidth
square air hole
circular air hole
Opis:
A novel mid-infrared polarization beam splitter (PBS) based on GaS is proposed. The high birefringence is achieved by using the cladding structure of alternating arrangement of square and circular air holes as well as introducing double elliptical air holes. The finite element method (FEM) is utilized to investigate the mode coupling characteristics in the proposed PBS. The results show that the highest extinction ratio of 115 dB and shortest length of only 40 μm can be realized at a wavelength of 4 μm. A wide bandwidth of 200 nm ranging from 3.9 to 4.1 μm is obtained.
Źródło:
Optica Applicata; 2022, 52, 3; 345--358
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Drilling bits in percussive-rotary drilling technology (down the hole DTH)
Autorzy:
Śliwa, T.
Śnieżek, P.
Powiązania:
https://bibliotekanauki.pl/articles/298928.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
drillbits
down-the-hole (DTH) drilling
Opis:
This paper addresses the issue of drillbits for drilling normal and large diameter boreholes with the use of percussion-rotary method. The most important elements of drillbits, i.e. sintered carbide inserts of different shapes have been described. The hardness of the drilled rock determines the shape of used sintered carbide inserts and the shape of the drillbit face. The cluster hammers, used for drilling large diameter DTH, have been also presented.
Źródło:
AGH Drilling, Oil, Gas; 2012, 29, 4; 453-462
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extraction of palladium(II) with through-hole type microcapsules containing trioctylamine
Autorzy:
Kiyoyama, S.
Shiomori, K.
Yoshida, M.
Powiązania:
https://bibliotekanauki.pl/articles/347023.pdf
Data publikacji:
2010
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
extraction
palladium
trioctylamine
microcapsules
through-hole
Opis:
Large-diameter and through-hole type microcapsule with entrapped trioctylamine (TOA) as an extractant were prepared by (W/O/W) emulsification and in-situ polymerization method. The morphologies of the microcapsules, their encapsulation efficiencies for TOA, and their forward and back extraction properties for palladium(II) were investigated. The microcapsules ranged in size from 210-420 ěm. The encapsulation efficiency of TOA was approximately 100% for all the microcapsules, which indicates minimal loss of TOA during preparation of the microcapsules. Through-hole type microcapsules were obtained when inner aqueous phase contained a high concentration of sodium chloride, and at a moderate agitation speed in the first emulsification. With the through-hole type microcapsules the extraction equilibrium approached one, and the extraction rate was very high compared to other preparation conditions and (O/W) type microcapsules.
Źródło:
Ars Separatoria Acta; 2009-2010, 7; 49-60
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of Primary Spectra of Particle Radiation from Black Holes
Autorzy:
Wijewardhana, C. N. T.
Wijewardena Gamalath, K. A. I. L.
Powiązania:
https://bibliotekanauki.pl/articles/1193473.pdf
Data publikacji:
2021
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Hawking radiation
Higgs boson emission
Kerr black hole
Planck mass
Primary emission spectra
Schwarzschild black hole
W±
Z0
primordial black hole
quark and gluon emission
Opis:
The instantaneous primary emission spectra of particles radiating from Schwarzschild black holes and maximally rotating Kerr black holes of masses 1013 – 1015 g were investigated and C code, BlackHawk was used for the simulations. From a Schwarzschild black hole of mass 3.53×1013 g, gluons had the lowest cutoff energy, 199 MeV. The emission spectra were dominated by coloured particles, quarks having with the highest overall emission rate, 2.826×1022 GeV-1s-1 at energy 1.205 GeV. The leptons e±, μ±, τ± showed similar variation in emission rates. The only particles emitted with energies below the rest mass of u quarks were neutrinos, photons, and e±. At greater particle energies (> ~ 2 GeV) the emission rates of all particles were almost equivalent. The emission of vector bosons, Z0 and W± were negligible and became significant when the mass reduced to ~1011 g and then gluons, W±, Z0 and photons were emitted similar to each other with a peak at energy, 280 GeV. The emitting rates of gluons, quarks, neutrinos, W±, e±, μ±, τ±, Z0, photons, and Higgs bosons are in decreasing order respectively. As the mass of the black hole is reduced to 1.06×108 g, quarks were emitted at the highest rate 2.826×1022 GeV-1s-1 at 4010 GeV peak energy and at energies between rest mass energy of Higgs boson and 1.25×105 GeV, the emission of Higgs bosons exceeded the emission of quarks. For maximally rotating Kerr black hole of mass 3.53×1013 g, W±, Z0 and Higgs boson were emitted at higher emission rates 1012 – 1015 GeV-1s-1 and for mass 1.06×108 g, the gluons had the highest overall emission rate at the peak energy. At extremely high energies, the gluon emission rates are less than the emission rates of Higgs bosons, quarks, neutrinos, and e±, μ±, τ±. The spin-dependent behaviour of spectra is also present.
Źródło:
World Scientific News; 2021, 158; 105-129
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved MCBDS for defending against gray hole and black hole attacks in MANETs
Autorzy:
Haghighi, A.
Mizanian, K.
Mirjalily, G.
Powiązania:
https://bibliotekanauki.pl/articles/102490.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
mobile ad hoc network
cooperative bait detection scheme (CBDS)
modified CBDS (MCBDS)
black hole
gray hole
MANET
Opis:
Mobile Ad-hoc Networks (MANETs) are widely used nowadays. Because of their characteristics as open media, dynamic topology, being infrastructure-less and lack of centralized monitoring, MANET is vulnerable to a wide range of attacks like blackhole and grayhole. Blackhole and grayhole attacks refer to the attacks that breach the security by performing packet forwarding and routing misbehavior and cause denial of service in MANETs. In this paper we improved our previous work on MCBDS, we reduced false-positive rate more than before and on average it dropped to zero. The proposed method employs Network Simulator-2 (NS-2) to validate the effectiveness under different scenarios. Simulation results show that improved MCBDS has same performance as CBDS in terms of throughput and end-to-end delay and as much as the presence of malicious nodes increased, improved MCBDS performs better than CBDS.
Źródło:
Advances in Science and Technology. Research Journal; 2016, 10, 30; 1-8
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Are nestlings of hole-nesting birds affected by ectoparasites? A review
Autorzy:
Mazgajski, T D
Kedra, A.H.
Powiązania:
https://bibliotekanauki.pl/articles/836416.pdf
Data publikacji:
1997
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
nestling
hole nesting bird
mortality
condition
ectoparasite
Opis:
In this review the influence of ectoparasites on nestlings' of some hole-nesting birds is discussed, especially the impact on nestlings' mortality or condition.
Źródło:
Annals of Parasitology; 1997, 43, 4
0043-5163
Pojawia się w:
Annals of Parasitology
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:
Set of Suffosion Holes Occurring After a Water Supply Failure as a Structure with Fractal Features
Autorzy:
Iwanek, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/2105274.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
water pipe failure
suffosion hole
fractal feature
Opis:
As a result of a buried water pipe unsealing, water often flows from the pipe to the soil surface, washing out the solid particles of soil and creating the so-called suffosion holes. It is a dangerous phenomenon, especially in urbanized areas, where it poses a threat to human safety and the stability of infrastructure. Uncontrolled outflows of water from water pipes belong to the main causes of suffosion in cities, occur in all water networks around the world and are difficult to predict. Therefore, it seems to be important to determine the size of the so-called the protection zone, which is the area around the potential leak where, in the event of a water pipe failure, it would be possible for water to flow in the soil. The analysis of the suffosion holes distribution around the place of leakage may be helpful in determining the size of the protection zone. Previous studies have shown that this distribution is random. Thus, the structure consisting of suffusion holes creates a certain geometric shape, which is difficult to describe using the classical concepts of Euclidean geometry. The study showed that this structure meets the conditions for probabilistic fractals, which means that elements of fractal geometry can be used to determine the size of the protection zone.
Źródło:
Journal of Ecological Engineering; 2022, 23, 6; 164--171
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of an adaptronic spindle for a faultless machining of homogeneous and inhomogeneous materials
Autorzy:
Dobrinski, Alexander
Möhring, Hans-Christian
Stehle, Thomas
Powiązania:
https://bibliotekanauki.pl/articles/1429106.pdf
Data publikacji:
2021
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
drilling process
adaptronic spindle
qualitative drill hole
Opis:
One of the latest topics in construction concerns the difficulty of producing faultless drill holes in parts made of composite and sandwich materials. At the Institute for Machine Tools of the University of Stuttgart, a prototype of an adaptronic drilling spindle for a machining of components made of homogeneous and inhomogeneous materials was developed within the framework of a research project, funded by the Federal Ministry for Economic Affairs and Energy. The spindle made it possible to limit the axial force and the torque acting on the tool, thus protecting the tools and the workpieces from any possible damage. The tests carried out with the spindle prototype proved that the axial feed force acting from the spindle can be reliably controlled by means of the developed spindle. It might be possible to restrict critical machining situations arising due to the removal of drill chips or the reduction of process temperatures.
Źródło:
Journal of Machine Engineering; 2021, 21, 2; 5-23
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the shape accuracy of cylindrical holes machined by EDM process
Autorzy:
Spadło, S.
Dudek, D.
Powiązania:
https://bibliotekanauki.pl/articles/99888.pdf
Data publikacji:
2012
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
electrical discharge machining
hole drilling
shape accuracy
Opis:
The paper deals with the investigations of influence parameters of electrodischarge machining (EDM) on the shape accuracy of holes machined by EDM process. BP-95. machine with electronic generator type was used to perform EDM process. Kerosene was used as a dielectric. During EDM process the parameters of current were permanent. The shape of electrode and way of passing dielectric were changed. The following parameters were determined: productivity of EDM process and shape accuracy of the drilling holes. The accuracy of bored cylindrical holes, is highest in case of hollowing out with the tubular electrode and for sucking out working liquid by her inner life. In the case of hollowing out with the electrode tubular, sinking the tube with pumping liquid by the inner life is the most favourable method causing the smallest mistakes of outlines of the cylindrically shape. The time of boring the arterial hole is shortest in case of hollowing out with the electrode tubular and for pumping working liquid by inside.
Źródło:
Journal of Machine Engineering; 2012, 12, 2; 98-104
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Are nestlings of hole-nesting birds affected by ectoparasites? A review
CZY PISKLĘTA DZIUPLAKÓW SĄ TRAPIONE PRZEZ PASOŻYTY ZEWNĘTRZNE?
Autorzy:
Mazgajski, T. D.
Kedra, A. H.
Powiązania:
https://bibliotekanauki.pl/articles/2148925.pdf
Data publikacji:
1997
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
nestling
hole nesting bird
mortality
condition
ectoparasite
Opis:
In this review the influence of ectoparasites on nestlings' of some hole-nesting birds is discussed, especially the impact on nestlings' mortality or condition.
Źródło:
Wiadomości Parazytologiczne; 1997, 43, 4; 347-355
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 137

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