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    Wyświetlanie 1-11 z 11
    Tytuł:
    Calibration performance investigation of an uncalibrated indigenous artefact probing for five-axis machine tool
    Autorzy:
    Rahman, M. M.
    Mayer, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/99523.pdf
    Data publikacji:
    2016
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    machine tools
    robustness
    uncertainty
    artefact
    Opis:
    On machine measurement of artefacts such as single ball, multiple balls or even prismatic shape artefact is gaining popularity for the calibration of five-axis machine tools. However, calibration results can be degraded due to errors from different process variables such as the measurement strategies, rotary axes indexations and artefact dismount and remount cycles. This research investigates the repeatability of uncalibrated indigenous artefact probing and machine tool error parameters calibration against a number of process variables. Uncertainties of the estimated parameters are estimated to quantify the calibration quality.
    Źródło:
    Journal of Machine Engineering; 2016, 16, 1; 33-42
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement Accuracy Investigation of Touch Trigger Probe with Five-Axis Machine Tools
    Badania dokładności pomiarów elektrostykową sondą przełączającą na obrabiarkach pięcioosiowych
    Autorzy:
    Rahman, M. M.
    Mayer, J. R. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/139534.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    probing
    machine tool
    touch probe
    repeatability
    measurement inaccuracy
    sondowanie
    obrabiarka
    sonda stykowa
    powtarzalność
    niedokładność pomiaru
    Opis:
    The touch trigger probe plays an important role in modern metrology because of its robust and compact design with crash protection, long life and excellent repeatability. Aside from coordinate measuring machines (CMM), touch trigger probes are used for workpiece location on a machine tool and for the accuracy assessment of the machine tools. As a result, the accuracy of the measurement is a matter of interest to the users. The touch trigger probe itself as well as the measuring surface, the machine tool, measuring environment etc. contribute to measurement inaccuracies. The paper presents the effect of surface irregularities, surface wetness due to cutting fluid and probing direction on probing accuracy on a machine tool.
    Elektrostykowe sondy przełączające grają istotną rolę we współczesnej metrologii z uwagi na ich zwartą i silną konstrukcję, odporność na uszkodzenia, długowieczność i doskonałą powtarzalność. Obok zastosowań we współrzędnościowych maszynach pomiarowych (CMM), sondy te są wykorzystywane do wyznaczenia położenia przedmiotu obrabianego na obrabiarce i oceny dokładności obrabiarek. Tak więc, dokładność pomiaru jest sprawą istotną dla użytkowników. Do powstawania niedokładności pomiaru przyczynia się sama sonda, a także powierzchnia pomiarowa, obrabiarka, środowisko pomiarowe itp. W artykule przedstawiono wpływ nierówności powierzchni, wilgotności powierzchni powodowanej obecnością chłodziwa i kierunku sondowania na dokładność pomiaru na obrabiarce.
    Źródło:
    Archive of Mechanical Engineering; 2016, LXIII, 4; 495-510
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Axis location and scale factors estimation for three-axis machines from periodic performance checks with laser distance measurements - risks and opportunities
    Autorzy:
    Nafi, A.
    Łoś, A.
    Mayer, J.R.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/99577.pdf
    Data publikacji:
    2010
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    CMM
    calibration
    performance
    diagnostic
    Opis:
    Users of coordinate measuring machine and large gantry machines need to ensure the volumetric performance of their machines in order to inspect, or machine, mechanical parts with precision. In the case of CMMs, the ASME B89.4.10360.2-2008 document imposes seven directions for a volumetric check. These directions offer some redundancy for axis location (out-of-squarenesses) and scale factor estimation. The paper looks at the opportunity of using the data for immediate machine correction and the risks involved. In particular, the fact of using test data for calibration and verification, the potential contamination from non-modelled motion errors and the representativity of the estimated parameters are considered. Experimental results obtained using laser interferometry on a LEGEX CMMs are used to present the main concepts.
    Źródło:
    Journal of Machine Engineering; 2010, 10, 4; 89-99
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A case of cutaneous larva migrans syndrome found in group of Polish citizens after coming back from Botswana
    Autorzy:
    Kotlowski, A.
    Olszanski, R.
    Rejewska, B.
    Mayer, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/838823.pdf
    Data publikacji:
    1998
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Tematy:
    cat
    Botswana
    Mediterranean zone
    Asia
    South America
    Polish citizen
    cutaneous larva
    dog
    Ancylostoma braziliense
    nematode
    climatic zone
    larva
    Africa
    Źródło:
    Annals of Parasitology; 1998, 44, 3
    0043-5163
    Pojawia się w:
    Annals of Parasitology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Peat consolidation -- new approach
    Autorzy:
    Mayer, Z.
    Coufal, R.
    Kowalów, M.
    Szczygielski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/230952.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wzmocnienie gruntu
    konsolidacja gruntu
    konsolidacja torfu
    osiadanie
    ground improvement
    soil consolidation
    peat consolidation
    settlement
    Opis:
    The problem of consolidation of soil has been widely investigated. The basic approach was given by Terzaghi who assumed soil of constant physical and mechanical parameters. In the case of peat consolidation, the permeability coefficient of soil and the elasticity modulus are functions of the settlement which is an important additional factor. The model proposed here assumes varying the elasticity and permeability coefficients. Moreover, the settlement is described by the so-called elementary curve which was approximated empirically based upon laboratory tests. The model allows to consider the case when the filtration in the peat body goes in horizontal direction. It happens so when the charging layer does not receive outgoing water from the pores. The model includes also the case when the load involving consolidation varies in time i.e. the charging layer grows up gradually. The model has been applied practically in several cases and it comes that there is a good agreement between calculated and measured settlement of the consolidated peat layer.
    Źródło:
    Archives of Civil Engineering; 2011, 57, 2; 173-186
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fast Stochastic Reorientations in Nematic PAA and PAP
    Autorzy:
    Podsiadły, R.
    Mayer, J.
    Janik, J. A.
    Krawczyk, J.
    Stanek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1963251.pdf
    Data publikacji:
    1997-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    35.20.Yh
    24.50.Fq
    61.30.Eb
    Opis:
    Incoherent quasielastic neutron scattering spectra were measured for nematic para-azoxyanisole (PAA) and para-azoxyphenetole (PAP) with the energy resolution of ca. 30 μ eV, at Dubna IBR-2 reactor. Data processing contained a careful background subtraction and the multiple scattering correction. The corrected spectra were subjected to a reorientational model fitting procedure. For PAA, a model of two convoluted reorientations - that of benzene rings coupled with the terminals and that of the whole molecule around the long molecular axis - gave a fairly good description of the quasielastic neutron scattering spectrum. For PAP, introducing a third motion - interconformational jumps in the ethoxy terminals - in addition to motions suggested for PAA, gave a good agreement with the measured quasielastic neutron scattering spectrum.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 3; 513-518
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Isotopic Re-Os age of molybdenite from the Szklarska Poręba Huta Quarry (Karkonosze, SW Poland)
    Autorzy:
    Mayer, W.
    Creaser, R. A.
    Mochnacka, K.
    Oberc-Dziedzic, T.
    Pieczka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059392.pdf
    Data publikacji:
    2012
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Karkonosze granite
    hydrothermal mineralisation
    Re/Os isotopic age
    Opis:
    New Re/Os isotopic data for molybdenite from the Szklarska Poręba Huta Quarry provide ages of 307 ± 2 Ma and 309 ± 2 Ma, respectively. The quarry is dominated by the porphyritic (“central”) and equigranular (“ridge”) varieties of the Karkonosze granite. Ore mineralisation hosted in aplogranite includes an assemblage of sulphides, sulphosalts, oxides and various rare phases. The molybdenite ages obtained are consistent with a previously published isotopic age of leucogranite (aplogranite?) from the same quarry and are only slightly older than a recently published, refined 2 6Pb/238U age of untreated zircons from the Szklarska Poręba Huta porphyritic granite. The age of the molybdenite corresponds moderately well to the younger stage of post-magmatic, pneumatolitic/hydrothermal activity of the Karkonosze granite (about 312 Ma).
    Źródło:
    Geological Quarterly; 2012, 56, 3; 505--512
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies on magnetite and pyrite mineralization, and on their early Palaeozoic ocean-floor host-rocks from the Leszczyniec Unit (West Sudetes, Poland)
    Autorzy:
    Oberc-Dziedzic, T.
    Mochnacka, K.
    Mayer, W.
    Pieczka, A.
    Creaser, R. A.
    Góralski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/191471.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    magnetite and pyrite mineralization
    metabasites
    ocean-floor metamorphism
    paragonite
    Leszczyniec Unit
    Sudetes
    Polska
    Opis:
    The Leszczyniec Unit extends along the eastern margin of the Karkonosze-Izera Massif. It comprises the Early Palaeozoic, MORB-like Leszczyniec complex composed of metabasites, metagranites and metasedi- ments. The metabasites host magnetite mineralization encountered in Jarkowice, whereas near Wieściszowice village the pyrite deposit occurs in metasediments and metabasites. The common feature of both sites is the almost complete absence of the accompanying ore minerals. Basing on petrographic, mineralogical, geochemical and microstructural studies, it was found that the metabasic rocks, which host magnetite mineralization, were lava flows, whereas the protoliths of pyrite-bearing schists were basic and acid tuffites accompanied by ocean-floor basalts. The igneous rocks from the Leszczyniec Unit were subjected to the ocean-floor metamorphism, whereas the accompanying sediments were altered by hydrothermal fluids enriched in sulphur ions, which reacted with iron derived from the sediment and promoted crystallization of pyrite. The sources of hydrothermal fluids were adjacent magmatic centres. The estimated age ~480 Ma for pyrite (Re-Os method) is similar to the previously known ~500 Ma age of metabasites (U-Pb, zircon method) from the Leszczyniec Unit, which establishes a temporal link between pyrite accumulation and the ocean-floor environment. The rocks of the Leszczyniec Unit, first altered by the ocean-floor metamorphism and the hydrothermal fluids, were subsequently subjected to the regional metamorphism at 360–340 Ma and the two-stage deformations of various intensities, followed by the third stage of deformations which caused the reorientation of the regional foliation. The zones of ductile and brittle deformations connected with the second deformation event host the accumulations of magnetite formed at the expense of Fe-bearing rock-forming minerals or from iron supplied from adjacent sources. In the pyrite-bearing schists, mineral assemblages formed during the hydrothermal alteration have been subjected to recrystallization and were included into domains defining foliation and lineation, which formed during the first stage of deformation. Pyrite crystals were affected by both deformation stages. At the end of the second stage, the invasion of fluids led to the dissolution of pyrite crystals and to the filling of cracks in pyrite crystals with chalcopyrite and tennantite. This process was followed by the formation of quartz veins with minor amounts of ore minerals.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2011, 81, No 2; 133-160
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Combined DPF+SCR systems for retrofitting in the VERT quality verification tests
    Autorzy:
    Czerwinski, J.
    Zimmerli, Y.
    Mayer, A.
    Bunge, R.
    Heeb, N.
    Lemaire, J.
    Jauss, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/248088.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    diesel emission reduction
    diesel particle filter
    SCR
    limited and unlimited emissions
    deNOx
    Opis:
    New Diesel exhaust gas aftertreatment systems, with DPF*) and deNOx (mostly SCR) inline application are very important step towards zero emission Diesel fleet. Solid quality standards of those quite complex systems are urgently necessary to enable decisions by several authorities. The Swiss Federal Office of the Environment BAFU and the Swiss Federal Roads Office ASTRA decided to support further activities of VERT to develop appropriate testing procedures and to define the quality criteria. The present report informs about the international network project VERT *) dePN (de-activation, de-contamination, disposal of particles & NOx), which was started in Nov. 2006 with the objective to introduce the SCR-, or (DPF+SCR)-systems in the VERT verification procedure. Examples of results with some investigated systems are given. The most important statements are: - the investigated combined aftertreatment systems (DPF+SCR) for dynamic engine application efficiently reduce the target emissions with deNOx-efficiency up to 92% (if operated in the right temperature window) and filtration efficiency based on particle count up to 100%, - the average NOx conversion rate at transient operation (ETC) depends strongly on the exhaust gas temperature profile and the resulting urea dosing control, - the NP filtration efficiency, which is verified at stationary engine operation is perfectly valid also at the transient operation. The present results will be confirmed in the further project activities with other systems and with different testing cycles. A special attention will be paid to the operational profiles, which are representative for low emissions zones LEZ.
    Źródło:
    Journal of KONES; 2008, 15, 3; 89-101
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystal structure and spectroscopic properties of 4-acetaminopyridine and its protonated form
    Autorzy:
    Koleva, B.B.
    Nikolova, R.
    Tchapkanov, A.
    Kolev, T.
    Mayer-Figge, H.
    Spiteller, M.
    Sheldrick, W.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/778733.pdf
    Data publikacji:
    2009
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    4-acetyloaminopirydyna
    struktura kryształów
    spektroskopia IR
    spektroskopia UV
    4-acetaminopyridine
    protonated form
    crystal structure
    solid-state linear polarized IR spectroscopy
    UV spectroscopy
    quantum chemical calculations
    1H and 13C NMR
    ESI-MS
    TGA and DSC
    Opis:
    4-Acetaminopyridine dihydrate and its protonated form, stabilized as the hydrochloride salt have been synthesized and spectroscopic elucidated in solution and in the solid-state by means of the inear-polarized solid state IR-spectroscopy (IR-LD), UV-spectroscopy, TGA, DSC, and the positive and negative ESI MS. Quantum chemical calculations were used to obtain the electronic structure, vibrational data and the electronic spectra. The spectroscopic and theoretical data are compared with the structure of the first compound obtained by single crystal X-ray diffraction. The effect of Npy protonation on the optical and magnetic properties of a 4-acetaminopyridine is discussed.
    Źródło:
    Polish Journal of Chemical Technology; 2009, 11, 3; 35-40
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of Shading of a Silvopastoral System on Microclimate and Botanical Composition of Polyphytic Pasture: A Preliminary Study in the Subtropics
    Autorzy:
    Vieira, Frederico Márcio C.
    Militão, Érica R.
    Wagner Júnior, Américo
    Herbut, Piotr
    Mayer, Lilian Regina R.
    Vismara, Edgar S.
    Vieira, Afrânio Márcio C.
    Paris, Wagner
    Hermes, Cátia
    Paśmionka, Iwona
    Powiązania:
    https://bibliotekanauki.pl/articles/2027870.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    integrated crop-livestock-forest systems
    biometeorology
    shading
    polyphytic grassland
    Opis:
    The silvopasture system is an integrated system which has been widespread in tropical and sub-tropical climates. However, there is a lack of detailed studies regarding agroecological silvopasture systems. This study assessed whether the different levels of shading in an agroecological silvopastoral system influences the microclimate and botanical composition of polyphytic pasture. We used eight paddocks composed of a silvopastoral system in a subtropical climate, with different tree species arranged in simple lines with polyphytic pasture. In each paddock, we established three levels of visual shading (under the canopy, intermediate and full sun). The following microclimatic variables were recorded monthly during the daytime: illuminance, air temperature, air relative humidity, wind speed, and surface soil temperature. The samples of forages were separated into grasses, legumes and spontaneous, then fractionated into leaves, stems, and senescent material. We observed lower values of illuminance and surface soil temperature under the canopy, with differences between full sun and under the canopy at noon. Regarding the forage, the percentage of legumes was higher in full sun, and spontaneous species and leaves had high proportions under the canopy. Based on the results, the agroecological silvopastoral system changed the microclimatic characteristics and altered the plant composition of polyphytic pasture.
    Źródło:
    Journal of Ecological Engineering; 2021, 22, 10; 215-224
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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