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    Wyświetlanie 1-13 z 13
    Tytuł:
    Condition-Based Preventive Maintenance of Machine Tools
    Autorzy:
    Neugebauer, R.
    Fischer, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/971213.pdf
    Data publikacji:
    2009
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    condition monitoring at machine tools
    diagnostic parameters
    main spindle
    axis drives
    hydraulic components
    pneumatic components
    Opis:
    Machine tools are expected to be highly available. Unintended failure incurs high costs for repairs and through production losses. Maintenance is a major cost factor and is still mostly reactive today, as a result of failures. Maintenance plans by manufacturers that require preventive maintenance based on running hours are often not implemented consistently. It would be ideal to perform condition-dependent preventive maintenance of the most critical and cost-intensive assemblies of a machine tool. This would make it possible to move repair times into non-productive periods and to procure any spare parts at the right time. Eventually, this would lead to cost savings. This article describes the design of a condition monitoring system for machine tools and shows ways of monitoring the most critical machine tool assemblies.
    Źródło:
    Journal of Machine Engineering; 2009, 9, 3; 64-76
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ichnofossil assemblages and palaeosols of the Upper Triassic Chinle Formation, south-eastern Utah (USA): Implications for depositional controls and palaeoclimate
    Autorzy:
    Fischer, J. S.
    Hasiotis, S. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/973435.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    continental
    trace fossils
    groundwater profile
    ichnology
    ichnocoenoses
    ichnopedofacies
    Mesozoic
    Opis:
    The Upper Triassic Chinle Formation in the Stevens Canyon area in south-eastern Utah represents fluvial, palustrine, and lacustrine strata deposited in a continental back-arc basin on the western edge of Pangea. Previous investigations interpreted a megamonsoonal climate with increasing aridity for the Colorado Plateau towards the end of the Triassic. In this study, we systematically integrate ichnological and pedological features of the Chinle Formation into ichnopedofacies to interpret palaeoenvironmental and palaeoclimatic variations in the north-eastern part of the Chinle Basin. Seventeen ichnofossil morphotypes and six palaeosol orders are combined into twelve ichnopedofacies, whose development was controlled by autocyclic and allocyclic processes and hydrology. Ichnopedofacies are used to estimate palaeoprecipitation in conjunction with appropriate modern analogue latitudinal and geographic settings. In the north-east Chinle Basin, annual precipitation was -1100-1300 mm in the Petrified Forest Member. Precipitation levels were >1300 mm/yr at the base of the lower Owl Rock Member, decreased to -700-1100 mm/yr, and then to -400-700 mm/yr. Two drying upward cycles from -1100 mm/yr to -700 mm/yr occurred in the middle and upper part of the Owl Rock Member. In the overlying Church Rock Member, precipitation decreased from -400 mm/yr at the base of the unit to -25-325 mm/yr at the end of Chinle Formation deposition. Ichnopedofacies indicate monsoonal conditions persisted until the end of the Triassic with decreasing precipitation that resulted from the northward migration of Pangea. Ichnopedofacies in the northeast Chinle Basin indicate both long-term drying of climate and short-term, wet-dry fluctuations.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2018, 88, 2; 127- 162
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New hybondontoid shark from the Permocarboniferous [Gzhelian-Asselian] of Guardia Pisano [Sardinia, Italy]
    Autorzy:
    Fischer, J
    Schneider, J.W.
    Ronchi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/20682.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    Numerous isolated teeth, fin spine fragments and dermal denticles of a hybodont shark from a lacustrine limestone horizon at the top of lithofacies B of the Late Carboniferous to Early Permian succession of the Guardia Pisano Basin (Sulcis area, southwestern Sardinia, Italy) are assigned to a new species of the genus Lissodus Brough, 1935. Lissodus sardiniensis sp. nov. is erected on the basis of about 500 teeth, which show a unique feature of only one pair of lateral cusps that are bent in the direction of the prominent central cusp. Weak heterodonty allows distinction of symphyseal, mesial to anterolateral, and lateral teeth. Lissodus sardiniensis sp. nov. was a freshwater−adapted durophagous shark of bottom dwelling habit, an interpretation supported by general construction of the dentition and the morphology of the dermal denticles. The association with Acanthodes, diplodoselachid sharks and branchiosaurs allows the reconstruction of a five−level trophic chain for the Guardia Pisano Basin. The discovery of Lissodusin Sardinia is presently the southernmost known occurrence of that genus in the Late Palaeozoic of Europe. This new find adds significantly to knowledge of migration routes of aquatic organisms, especially freshwater sharks, between the single European basins in the Late Pennsylvanian, and changes in palaeobiogeography during the Early Permian.
    Źródło:
    Acta Palaeontologica Polonica; 2010, 55, 2; 241-264
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Age-dependent changes in the calcium concentration in womens bones and teeth
    Autorzy:
    Fischer, A.
    Brodziak-Dopierala, B.
    Stojko, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1192510.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Tematy:
    calcium
    bones
    teeth
    AAS
    Opis:
    The inorganic part of bone tissue is mainly composed of Ca. In adult people, the resorption processes lead to the removal of minerals from calcified tissues. Women’s bodies are particularly vulnerable to a decrease in the concentration of Ca because the osteolysis processes that occur with age are compounded by hormonal changes during the menopause. The aim of the study was to determine the age-dependent concentration of Ca in the bones and teeth of adult women. The object of the research was calcified tissues bones and teeth (n=323). Samples were taken from women aged 26 - 85 years (mean: 55.7 years), living in Poland, in the Silesian Province. Samples were submitted to wet microwave mineralization (spectrally pure nitric acid). The Ca concentration in teeth and bones was determined with the AAS method. The concentration of Ca in the tested samples of calcified tissues from women aged 26 - 85 years was 10.1‑32.0%, and the average concentration was 16.7±3.5% in bones and 22.2±4.7% in teeth. The calcified tissues, from both bones and teeth, show a progressive decrease in the Ca concentration that occurs as women age. The decreasing level of Ca in bone and teeth was statistically significant (p<0.05). There was a difference in what age calcium is released from bones and teeth. The research showed that a decrease in the Ca concentration in bone tissue occurs earlier than it happens in teeth (about 10 years). The decrease in the Ca concentration in calcified tissues of teeth was slight greater than in bones, indicating slightly greater mobilization of Ca from the tissues of teeth.
    Źródło:
    Journal of Elementology; 2020, 25, 4; 1319-1331
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    In Situ Measurements of Atmospheric CO And Its Correlation With Nox And O3 at a Rural Mountain Site
    Autorzy:
    Li, J.
    Reiffs, A.
    Parchatka, U.
    Fischer, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/221507.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    trace gas measurements
    atmospheric CO
    QCL sensor
    sources relation
    sources identification
    Opis:
    Ambient concentrations of CO, as well as NOx and O3, were measured as a part of the PARADE campaign conducted at the Taunus Observatory on the summit of the Kleiner Feldberg between the 8th of August and 9th of September 2011. These measurements were made in an effort to provide insight into the characteristics of the effects of both biogenic and anthropogenic emissions on atmospheric chemistry in the rural south-western German environment. The overall average CO concentration was found to be 100.3±18.1 ppbv (within the range of 71 to 180 ppbv), determined from 10-min averages during the summer season. The background CO concentration was estimated to be ~90 ppbv. CO and NOx showed bimodal diurnal variations with peaks in the late morning (10:00-12:00 UTC) and in the late afternoon (17:00-20:00 UTC). Strong correlations between CO and NOx indicated that vehicular emission was the major contributor to the notable CO plumes observed at the sampling site. Both local meteorology and backward trajectory analyses suggest that CO plumes were associated with anthropogenically polluted air masses transferred by an advection to the site from densely populated city sites. Furthermore, a good linear correlation of R2 = 0.54 between CO and O3 (∆O3/∆CO=0.560±0.016 ppbv/ppbv) was observed, in good agreement with previous observations.
    Źródło:
    Metrology and Measurement Systems; 2015, 22, 1; 25-38
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrazinium 5-Aminotetrazolate: an Insensitive Energetic Material Containing 83.72% Nitrogen
    Autorzy:
    Fischer, N.
    Klapötke, T. M.
    Scheutzow, S.
    Stierstorfer, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/358539.pdf
    Data publikacji:
    2008
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    hydrazines
    tetrazoles
    crystal structure
    energetic materials
    sensitivities
    Opis:
    Hydrazinium 5-aminotetrazolate (2) was synthesized via two facile routes. Both the reaction of 5-amino-1H-tetrazole (1) with hydrazine hydrate in aqueous solution and the reaction of 1 with diluted hydrazine solution in THF yield 2 in excellent purities and yields. 2 was characterized comprehensively by X-ray diffraction, IR, Raman and multinuclear NMR spectroscopy, mass spectrometry, elemental analysis and differential scanning calorimetry. The heat of formation was calculated (CMS-4M) using the atomization method to be 373 kJ mol-1. With this value and the X-ray density several detonation parameter (heats of explosion, detonation pressure, detonation velocity, explosion temperature) were calculated with the EXPLO5 computer software. An incredible high value (9516 m s-1) was obtained for the detonation velocity. Therefore experimentally tests to determine the velocity of detonation were performed. In addition the use of 2 in solid propellant compositions was calculated and tested in combination with oxidizers, e.g. ammonium dinitramide. Lastly the sensitivities towards impact, friction and electrostatic discharge were determined with the BAM drophammer, friction tester and an ESD machine.
    Źródło:
    Central European Journal of Energetic Materials; 2008, 5, 3-4; 3-18
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tutorial on operating characteristics of microprocessor-based multiterminal line current differential relays
    Autorzy:
    Kasztenny, B
    Benmouyal, G
    Altuve, H J
    Fischer, N
    Powiązania:
    https://bibliotekanauki.pl/articles/410604.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    protective relaying
    differential protection
    Alpha Plane principle
    Opis:
    Line current differential (87L) protection schemes face extra challenges compared with other forms of differential protection, in addition to the traditional requirements of sensitivity, speed, and immunity to current transformer saturation. Some of these challenges include data communication, alignment, and security; line charging current; and limited communications bandwidth. To address these challenges, microprocessor-based 87L relays apply elaborate operating characteristics, which are often different than a traditional percentage differential characteristic used for bus or transformer protection. These sophisticated elements may include adaptive restraining terms, apply an Alpha Plane, use external fault detection logic for extra security, and so on. While these operating characteristics provide for better performance, they create the following challenges for users: x Understanding how the 87L elements make the trip decision. x Understanding the impact of 87L settings on sensitivity and security, as well as grasping the relationship between the traditional percentage differential characteristic and the various 87L operating characteristics. x Having the ability to transfer settings between different 87L operating characteristics while keeping a similar balance between security and dependability. x Testing the 87L operating characteristics. These issues become particularly significant in applications involving more than two currents in the line protection zone (multiterminal lines) and lines terminated on dual-breaker buses. This paper is a tutorial on this relatively new protection topic and offers answers to the outlined challenges.
    Źródło:
    Present Problems of Power System Control; 2013, 3; s. 5-73
    2084-2201
    Pojawia się w:
    Present Problems of Power System Control
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza oddziaływania stacji paliw na stopień zanieczyszczenia gleby metalami ciężkimi
    Analysis of influence of petrol stations on degree contamination of soil by heavy metals
    Autorzy:
    Kwapuliński, J.
    Bebek, M.
    Mitko, K.
    Fischer, A.
    Wiechuła, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/272147.pdf
    Data publikacji:
    2007
    Wydawca:
    Górnośląska Wyższa Szkoła Pedagogiczna im. Kardynała Augusta Hlonda
    Tematy:
    stacja paliw
    gleba
    zanieczyszczenie
    metale ciężkie
    petrol station
    soil
    contamination
    heavy metals
    Opis:
    W artykule zamieszczono rezultaty analizy oddziaływania ruchu komunikacyjnego na gleby w pobliżu stacji paliw. Metodą ASA oznaczono w próbach gleby zawartość: Fe, Ni, Cu, Zn, Cd oraz Pb. Próby te pobrano w sąsiedztwie 22 stacji paliw zlokalizowanych na terenie woj. śląskiego. Do oceny tendencji zmian zawartości metali wykorzystano analizę korelacyjną oraz analizę czynników głównych. Współczynniki korelacji między zawartościami wybranych metali mogą być wykorzystane do weryfikacji zasięgu wpływu emisji komunikacyjnej na gleby w sąsiedztwie dróg i stacji paliw.
    The results of analysis of the influence of motor vehicle emission on soils near petrol stations are presented in this paper. The contents of Fe, Ni, Cu, Zn, Cd, Pb were determined by atomic absorption spectrometry (AAS). The soil samples were taken in the vicinity of 22 petrol stations in the region of Upper Silesia. Principal component analysis and correlation analysis were used for the determination of change tendency in heavy metal contents. The correlation factors between contents of selected metals may be used for verification of the long-term influence on the soils of both vehicle emission and petrol stations.
    Źródło:
    Problemy Ekologii; 2007, R. 11, nr 2, 2; 101-107
    1427-3381
    Pojawia się w:
    Problemy Ekologii
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optically Detected SdH Oscillations in CdTe/(CdMg)Te and CdTe/(CdMnMg)Te Modulation Doped Quantum Wells
    Autorzy:
    Shen, J. X.
    Ossau, W.
    Fischer, F.
    Waag, A.
    Landwehr, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943817.pdf
    Data publikacji:
    1995-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Et
    Opis:
    Oscillations of photoluminescence properties in external magnetic fields are investigated in CdTe modulation doped quantum wells. The oscillatory behaviour of the luminescence intensity, the line width and the g factor is due to many-body effects in the 2-dimensional electron gas. The oscillation of photoluminescence intensity can be easily used as optically detected Shubnikov de Haas effect to determine the electron concentration in quantum wells without contacts.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 5; 1033-1037
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Doping of the Wide-Gap Semiconductor Cd$\text{}_{1-x}$Mg$\text{}_{x}$Te During Molecular Beam Epitaxy
    Autorzy:
    Fischer, F.
    Litz, Th.
    Waag, A.
    Heinke, H.
    Scholl, S.
    Gerschütz, J.
    Landwehr, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1876265.pdf
    Data publikacji:
    1995-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Bd
    Opis:
    We investigated the n-type doping of the wide-gap II-VI semiconductor (CdMg)Te. The n-type doping of (CdMg)Te has previously been achieved in only a small range of magnesium concentration. By the use of zinc iodine as dopant source material, we obtained highly doped (CdMg)Te layers up to a magnesium concentration of 40%. The limiting factor for the free carrier concentration at room temperature is the occurrence of a deep level, which dominates the electrical properties at room temperature of layers with more than 30% magnesium. Compensating defects or defect complexes are considered, to explain the observed properties of the deep level, which do not seem to be characteristic of an isolated donor state.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 2; 487-491
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A mysterious giant ichthyosaur from the lowermost Jurassic of Wales
    Autorzy:
    Martin, J.E.
    Vincent, P.
    Suan, G.
    Sharpe, T.
    Hodges, P.
    Williams, M.
    Howells, C.
    Fischer, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/23272.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    ichthyosaur
    deposit
    morphotype
    Jurassic
    Wales
    Opis:
    Ichthyosaurs rapidly diversified and colonised a wide range of ecological niches during the Early and Middle Triassic period, but experienced a major decline in diversity near the end of the Triassic. Timing and causes of this demise and the subsequent rapid radiation of the diverse, but less disparate, parvipelvian ichthyosaurs are still unknown, notably because of inadequate sampling in strata of latest Triassic age. Here, we describe an exceptionally large radius from Lower Jurassic deposits at Penarth near Cardiff, south Wales (UK) the morphology of which places it within the giant Triassic shastasaurids. A tentative total body size estimate, based on a regression analysis of various complete ichthyosaur skeletons, yields a value of 12-15 m. The specimen is substantially younger than any previously reported last known occurrences of shastasaurids and implies a Lazarus range in the lowermost Jurassic for this ichthyosaur morphotype.
    Źródło:
    Acta Palaeontologica Polonica; 2015, 60, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Manoeuvring areas to adapt ACAS for the maritime domain
    Autorzy:
    Baldauf, M.
    Mehdi, R.
    Deeb, H.
    Schröder-Hinrichs, J. U.
    Benedict, K.
    Krüger, C.
    Fischer, S.
    Gluch, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/135052.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    situation-dependent analysis
    risk assessment
    risk of collision
    collision probability
    prediction of manoeuvring areas
    potential areas of water
    fast time simulation
    Opis:
    Rapidly increasing numbers of ships and ship sizes pose an ever-growing challenge to the maritime industry. Although statistics indicate improved levels of safety in the industry which carries 90% of the world’s trade, the risk of navigational accidents, among other issues, remains a prime concern and priority (EMSA, 2010; 2014). In order to address these concerns, the authors turned to another high-risk industry for inspiration. Specifically, they turned to the aviation industry, which has often been used as a source of comparisons and ideas by researchers in the maritime domain. Keeping up with the trend, the authors of this paper turn to a tried-and-tested system used widely in modern aviation: the Airborne Collision Avoidance System (ACAS). The prime idea behind ACAS is to construct two virtual 3D zones around an aircraft. These zones are dynamic, and depend on the manoeuvring characteristics of a given aircraft. If the system detects an “intruder” (another aircraft) in either of the two well-defined virtual zones, it provides warnings and/or instructions to pilots of both aircraft to take certain precautionary or emergency measures. In the current paper, the authors explore whether or not such a system is feasible for use in the maritime domain and, if so, how. The paper provides a detailed analysis of the potential benefits and drawbacks of using an ACAS-like system onboard vessels. It also discusses possible means of implementation and integration with current equipment, and explores how the introduction of e-navigation may impact the proposed solution.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 43 (115); 39-47
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat shock protein 70 (HSP70) in gastric adaptation to aspirin in Helicobacter pylori infection
    Autorzy:
    Konturek, J.W.
    Fischer, H.
    Konturek, P.C.
    Huber, V.
    Boknik, P.
    Luess, H.
    Neumann, J.
    Brzozowski, T.
    Schmitz, W.
    Hahn, E.G.
    Domschke, W.
    Konturek, S.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/69242.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Fizjologiczne
    Tematy:
    infection
    protein 70
    gastric adaptation
    heat shock
    gastric mucosa
    aspirin
    Helicobacter pylori
    Źródło:
    Journal of Physiology and Pharmacology; 2001, 52, 1
    0867-5910
    Pojawia się w:
    Journal of Physiology and Pharmacology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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