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Wyświetlanie 1-15 z 72
Tytuł:
Adhesive bond of carbon steel S235J0: effects of aluminium and polymer powder filled epoxy adhesives on mechanical properties
Autorzy:
Müller, M.
Valášek, P.
Powiązania:
https://bibliotekanauki.pl/articles/102623.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
adhesive bond strength
SEM
microparticles filler
tensile strength
elongation
structural two-component epoxy
Opis:
The paper deals with the testing of composite materials based on aluminium and polymer microparticles. The aim of the research was to determine an influence of a content of a microparticle filler on mechanical properties of the polymer particle composite and adhesive bonds (material structural carbon steel S235J0). A preparation of adhesive bonds and a process of testing of the adhesive bonds were in accordance with the standard CSN EN 1465. The adhesive bond strength was increased when adding the aluminium and polymer powder filler. The adhesive bond strength increase was the highest at the adhesive bond with the adhesive in the form of the composite (15 g of the filler : 100 g of the matrix). The adhesive bond strength increase was 14.3% (13.68 ± 0.43 MPa). Adhesive bonds evinced an adhesive type of a fracture surface. By adding the filler in a form of microparticles there was a change of the failure type on adhesive-cohesive and a cohesive type. Fracture surfaces and an adhesive bond cut was examined with SEM (scanning electron microscopy) using a microscope MIRA 3 TESCAN.
Źródło:
Advances in Science and Technology. Research Journal; 2016, 10, 31; 87-93
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An improved formula for dead time correction of G-M detectors
Autorzy:
Arkani, M.
Khalafi, H.
Powiązania:
https://bibliotekanauki.pl/articles/147009.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dead time model
Geiger-Müller (G-M) detector
decaying source experiment
hybrid model
Opis:
Different analytical formulae have been described in the literature to modify response of Geiger-Müller (G-M) detectors. In this work, improvement of a previously proposed dead time correction formula was investigated. A set of experimental data of a decaying source was the basis of the analysis. A general agreement is seen with the experimental data. The result was compared with those obtained by the original work. Numerical aspects were also examined.
Źródło:
Nukleonika; 2013, 58, 4; 533-536
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of degreasing on adhesive joint strength
Autorzy:
Rudawska, A.
Nalepa, J.
Müller, M.
Powiązania:
https://bibliotekanauki.pl/articles/102003.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
adhesive joints
strength
surface treatment
degreasing
Opis:
The paper investigates the effects of degreasing, surface preparation methods in adhesive bonding and con adhesive joint strength. Five types of degreasing agents were used in the study: acetone, extraction naphtha, Ultramyt, Wiko and Loctite 7061. The degreasing operation was performed by three methods: rubbing, spraying and immersion. Strength tests were performed on single-lap adhesive joints of hot-dip galvanized metal sheets made with Loctite 9466 adhesive according to the above variants of surface preparation. The experimental results demonstrate that adhesive joint strength is significantly affected by the applied degreasing agent. Moreover, the method of application of the degreasing agent is crucial, too. The results of strength testing reveal that the most effective degreasing method for hot-dip galvanized metal sheet adhesive joints is spraying using extraction naphtha. Thereby, degreased samples have the highest immediate strength and shear strength. The use of extraction naphtha is also effective in combination with degreasing by rubbing; however, it is not effective when used in combination with immersion, as reflected in the lowest strength results.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 1; 75-81
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficient dead time correction of G-M counters using feed forward artificial neural network
Autorzy:
Arkani, M.
Khalafi, A.
Powiązania:
https://bibliotekanauki.pl/articles/146121.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dead time
artificial neural network (ANN)
Geiger-Müller (G-M) detector
hybrid model
source decaying experiment
Opis:
Dead time parameter of Geiger-Müller (G-M) counters causes a great uncertainty in their response to the incident radiation intensity at high counting rates. As their applications in experimental nuclear science are widespread, many attempts have been done on improvements of their nonlinear response. In this work, response of a G-M counter system is optimized and corrected efficiently using feed forward artificial neural network (ANN). This method is simple, fast, and provides the answer to the problem explicitly with no need for iteration. The method is applied to a set of decaying source experimental data measured by a fairly large G-M tube. The results are compared with those predicted by a given analytical model which is called hybrid model. The maximum deviation of the corrected results from the true counting rates is less than 4% which is a significant improvement in comparison with the results obtained by the analytical method. Results of this study show that by using a proper artificial neural network structure, the dead time effects of G-M counters can be tolerated significantly.
Źródło:
Nukleonika; 2013, 58, 2; 317-321
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultrasound velocities and magnetomechanical coupling in Fe Co-Ni-Zr-Cu-Nb-B alloy strips after heat treatment
Autorzy:
Kaczkowski, Z.
Muller, M.
Lanotte, L.
Powiązania:
https://bibliotekanauki.pl/articles/332820.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
The magnetic field and beat-treatment dependences of the ultrasound velocities at constant magnetic field (CH) and at constant magnetic induction (cB) and magnetomechanical coupling were investigated in Fe62.5Co6Ni7.5Zr6Cu1Nb2B15 alloy strips in an as-quenched state and after annealing above the Curie temperature. After annealing above 350oC (up to 390oC) the magnetomechanical coupling coefficient (k) was three times higher than that for asquenched state (0.10-012), i.e. k = 0.32-0.37. The minimum values of the cH (= 3.6 km/s) were observed after annealing in the temperature range from 350 to 390oC at 75-100 A/m. There are equal or somewhat higher values of bias field for the minimum of the cH than in some other iron-rich amorphous alloys. Effect de was very small for as-quenched samples. When the samples reached the magnetic saturation, the domain structure vanished and then the Hooke's law was valid, i.e. EH = EB = E, where E was then material constant, known as Young's modulus and then the ultrasound velocities are also material constant.
Źródło:
Hydroacoustics; 2001, 4; 101-104
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Nanocrystallization Process on the Magnetomechanical Coupling in Fe-Si-B-Cu-Nb Alloy
Autorzy:
Kaczkowski, Z.
Małkiński, L.
Kuźmiński, M.
Müller, M.
Powiązania:
https://bibliotekanauki.pl/articles/1861130.pdf
Data publikacji:
1994-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.80.+q
75.60.Nt
75.60.Ch
Opis:
Magnetic and magnetoelastic properties of the Fe$\text{}_{73.5}$Si$\text{}_{16.5}$B$\text{}_{6}$Cu$\text{}_{1}$Nb$\text{}_{3}$ alloy change considerably during nanocrystallization process. Improvement of magnetic properties is accompanied by the decrease in piezomagnetic parameters such as magnetomechanical coupling and $\Delta E$-effect.
Źródło:
Acta Physica Polonica A; 1994, 85, 1; 201-204
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The properties of regenerative polymer mass
Autorzy:
Rudawska, A.
Wierzchowski, A.
Müller, M.
Petrů, J.
Náprstková, N.
Powiązania:
https://bibliotekanauki.pl/articles/102482.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
regeneration
regenerative polymer mass
mechanical properties
Opis:
The paper investigates the compression strength of samples of regenerative polymer mass RM 101 Resimetal Metal Repair Pasta manufactured by Rendor. The effect of weather conditions on selected mechanical properties of the tested mass is examined. The samples are subjected to seasoning at room temperature, in an environmental chamber, and in a thermal shock chamber. The samples for strength testing are made according to the adopted method. It has been observed that the samples seasoned at room temperature have the lowest strength, while the highest strength is exhibited by the samples subjected to seasoning in an environmental chamber at a temperature of 70°C and humidity of 95%. In addition, the paper compares the strength properties of regenerative polymer masses manufactured by Chester Molecular, Belzona, and Unirep, as well as of the widely used epoxy compound Epidian 57 mixed with the Z-1 curing agent with those of the Rendor mass. The properties of the above masses are obtained from the available literature.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 3; 130-138
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hybrid lvl panels made of eucalypt and pine woods decayed by white-rot fungus
Autorzy:
Delucis, R.
Herrera, R.
Melo, R.
Muller, M.
Labidi, J.
Gatto, D.
Powiązania:
https://bibliotekanauki.pl/articles/52545.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Źródło:
Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2018, 61, 201
1644-3985
Pojawia się w:
Drewno. Prace Naukowe. Doniesienia. Komunikaty
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intelligent hybrid material slide component for machine tools
Autorzy:
Möhring, H. C.
Wiederkehr, P.
Baumann, J.
König, A.
Spieker, C.
Müller, M.
Powiązania:
https://bibliotekanauki.pl/articles/100179.pdf
Data publikacji:
2017
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
process stability simulation
thermal analysis
machine tool
Opis:
In mid-scale and large five axis overhead gantry type milling machines, the vertical z-slide (ram) often constitutes one of the most sensitive and critical components regarding stiffness, structural vibrations and thermal influences. During machining, the z-slide is loaded by (quasi-) static process and drive forces, transient acceleration forces, periodic excitations by the tool engagement, as well as by thermal effects resulting from altering ambient conditions, heated chips, cooling lubricant and power losses in drives, guides and bearings. Deflections, thermal deformations and vibrations of the z-slide lead to geometric machining errors and inacceptable surface location errors at the workpieces. Furthermore, instable cutting conditions and regenerative chatter limit applicable material removal rates and, thus, productivity. In this work, a newly developed hybrid material structure for an exemplary z-slide, involving metal parts and mineral cast, is introduced. Structural optimization methods as well as process simulation techniques were applied in order to derive the final design solution. The integration of active cooling circuits for thermal stabilization is investigated and the use of fibre optical strain sensors is analysed with respect to a state monitoring of the machine tool component.
Źródło:
Journal of Machine Engineering; 2017, 17, 1; 17-30
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Review of G. Häublein/M. Müller/P. Rusch/T. Scherling/L. Wertenschlag: Memo. Wortschatz- und Fertigkeitstraining zum Zertifikat Deutsch als Fremdsprache. Berlin und München: Langenscheidt, 1995.
Autorzy:
Krzysiak, Lucyna
Powiązania:
https://bibliotekanauki.pl/articles/605500.pdf
Data publikacji:
1995
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Źródło:
Lublin Studies in Modern Languages and Literature; 1995, 19; 187-189
0137-4699
Pojawia się w:
Lublin Studies in Modern Languages and Literature
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cavity-Polariton Effects in II-VI Microcavities
Autorzy:
André, R.
Boeuf, F.
Heger, D.
Dang, Le Si
Romestain, R.
Bleuse, J.
Müller, M.
Powiązania:
https://bibliotekanauki.pl/articles/2011103.pdf
Data publikacji:
1999-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.36.+c
42.55.Sa
78.66.-w
Opis:
Semiconductor microcavities are monolithic multilayer heterostructures grown by molecular beam epitaxy. They allow the confinement along the growth axis of both photons between the Bragg reflectors and excitons in quantum wells. If the exciton-photon coupling matrix element is large enough compared to the line width, the system is said to be in the strong coupling regime. In that case a quantum well exciton couples to another discrete state: the photon mode of a planar microcavity with the same in-plane wave vector, to give rise to quasi-stationary states named cavity polaritons. In this regime, the Fermi golden rule does not hold any more and the optical properties, linear or nonlinear, are strongly related to polariton features. A review of the optical properties of CdTe-based microcavities operating in the strong coupling regime is given in this paper. The strength of the exciton-photon coupling, dynamic optical properties, and relaxation processes along polariton dispersion curves will be discussed, as well as stimulated emission of cavity polariton luminescence.
Źródło:
Acta Physica Polonica A; 1999, 96, 5; 511-524
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Broadband concept of energy harvesting in beam vibrating systems for powering sensors
Autorzy:
Rysak, A
Müller, M.
Borowiec, M.
Zubrzycki, J.
Litak, G.
Godlewska-Lach, A
Wittstock, V.
Powiązania:
https://bibliotekanauki.pl/articles/957989.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
piezoceramic
energy harvesting
vibration
broadband effect
impacts
Opis:
Recent demand for powering small sensors for wireless health monitoring triggered activities in the field of small size efficient energy harvesting devices. We examine energy harvesting in an aluminium beam with a piezoceramic patch subjected to kinematic harmonic excitation and impacts. Due to a mechanical stopper applied, inducing a hardening effect in the spring characteristic of the beam resonator, we observed a broader frequency range for the fairly large power output. Impact nonlinearities caused sensitivity to initial conditions and appearance of multiple solutions. The occurrence of resonant solution associated with impacts increased efficiency of the energy harvesting process.
Źródło:
Advances in Science and Technology. Research Journal; 2014, 8, 23; 62-67
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lingula dregeri (Brachiopoda) from the Middle Miocene of Hungary
Autorzy:
Bitner, M. A.
Dulai, A.
Kocsis, L.
Müller, P. M.
Powiązania:
https://bibliotekanauki.pl/articles/191757.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
Brachiopoda
Lingula
Middle Miocene
Pannonian Basin
Hungary
Opis:
Lingulide brachiopods, assigned to Lingula dregeri Andreae, 1893, have been identified from the Middle Miocene (Upper Badenian) of the Hungarian part of the Pannonian Basin. Although widely distributed in the Miocene of the Central Paratethys (Austria, Poland, Ukraine, Romania), the genus Lingula was not described previously from Hungary. Outside of the Central Paratethys, L. dregeri also has been recognized in the Atlantic and Mediterranean provinces and most probably in the Eastern Paratethys.
Źródło:
Annales Societatis Geologorum Poloniae; 2012, 82, 1; 39--43
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gametogenic cycle in Vertigo pusilla O.F. Muller, 1774 (Gastropoda: pulmonata: Vertiginidae)
Autorzy:
Mazurkiewicz, M.
Pokryszko, B.M.
Powiązania:
https://bibliotekanauki.pl/articles/84583.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Opis:
Gonads of V. pusilla at various growth stages were examined with standard histological methods. The first gonial cells appeared at the stage of 3.3 whorls: few and poorly developed gonad vesicles contained fine mitotically dividing cells and cells in meiotic prophase, with the first growing oocytes in the peripheral parts of the vesicles. At 4-whorl stage the oocytes entered vitellogenesis and increased in volume. In subadult individuals the oocyte volume and the gonad volume increased considerably; besides the advanced vitellogenic oocytes new oocytes appeared, the number of spermatids increased and the first spermatozoa were observed. The gonad of pre-reproductive adults contained numerous late-vitellogenic oocytes, young growing oocytes and many spermatozoa. In post-reproductive individuals there were no mature oocytes, spermatozoa were few, but the presence of young oocytes and mitotically dividing cells indicated resumption of gamete production.
Źródło:
Folia Malacologica; 2005, 13, 1
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 72

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